Anton chekhov critic research paper Example | Topics and Well Written Essays - 500 words

Anton chekhov critic - Research Paper Example His is rather the cynical chuckle of a grown-up watching a child assume grimaces of deep earnestness and self-importance†. This is a unique type of humor that Chekhov captured masterfully in his early career and it is nice to see it appreciated by critics. This opinion of Chekhov is important because it shows that he did not take life too importantly. Many authors become overly serious about their craft and are unable to look at themselves objectively. This can completely ruin people, as once you begin taking yourself too seriously you lose your edge. In his earlier stories, Fagin claims that Chekhov had a much better sense of humour and did not take himself too seriously. This made these easier stories much more enjoyable to read, as â€Å"his earlier stories the laughable, and it is a more or less cheerful laugh, with little of the serious behind it† (Fagin). As Chekhov’s career carried on, however, Fagin noticed that he began to look at life differently and his stories suffered as a result. This is unfortunate, but it is probably a direct result of his upbringing in Russia and the social landscape during that time period. Fagin writes, â€Å"But as the stories grow more in volume, the undercurrent of gloom and a stifled groan of pain become more and more audible, until, in the later volumes, his laugh quite eloquently suggest the ominous combination of submission to Fate and Mephistophelian despair†. This shows that there was a fair amount of gloom in his life, as he did not know what the future would hold, but he did not believe that it would be positive for him and his country. No one knows for sure why Chekhov’s style of writing changed, but is very likely that the impact of the Russian political system had a major impact on it. This political system is though to be very dreary and to take a great deal of hope away from people, so it is possible that Chekhov essentially lost hope in life and that his writing shows this. No matter what the reason for

Trust2 Home Fund Case Study Example | Topics and Well Written Essays - 5000 words

Trust2 Home Fund - Case Study Example In 2003 and 2004, accounting irregularities in mortgage finance companies Fannie Mae and Freddie Mac grabbed the attention of every one in the world. The failure of Northern Rock in UK has shaken the public confidence in financial markets.Sub prime lending killed many homes dreams in US and UK. Global recession has turned many financial institutions and programmes in doldrums. Stability in the financial market is lost. Investors have become shaky about hazy dealing from financial institutions. If the private sectors are to rebuild that confidence and trust, they must have transparency, respect and integrity. They must be central to the development of a successful and trustworthy brand in financial services. These values need to be introduced at the macro level. Sufficient confidence has to be built among customers that the banks have quality capital and that they can absorb the losses incurred in course of operation. Insurers must have the capacity to support liabilities. There is urgent need for sound back up by reliable institutions preferably government to all risk plans and transactions. Protection must come from the government through stable financial system. Products launched in the financial segment need scrutiny and approval by the authorities. Only then confidence of public and investors can be restored and stability can be promoted in the financial market. This can be more effectively done by the single institution of Government. FSA is on the work to strengthen and rebalance regulations that were lost in between so that lost confidence is restored in the financial system. Sam Fleming, November 1,2007, Daily Mail, Credit crisis 'could cripple UK economy' Product Keeping the above scenario in the mind there is need for opening such business fronts wherein investors have confidence, trust and reliability. Money market mutual funds have such face to restore the investors' confidence if backed by government. The industry represents a multibillion-dollar investment segment. Money market accounts are popular alternatives to CD's, short-term bonds, and savings accounts. This is possible by competitive yields, daily access to the money, and a sense of safety and stability that a money market provides. Money market funds offered by the top banks and brokerage houses are also not immune to a loss in value or liquidity but they can present a better picture. Banks in the money market plan use the depositors' money in buying a large pool of very short term bond including, government bonds, corporate bonds, or municipal bonds, which are more secured. True money market funds are not a

Caravaggios The Denial of St. Peter

Caravaggios The Denial of St. Peter   Ã‚  Ã‚  Ã‚  Ã‚  In approximately 1610, Michelangelo Merisi, referred to today as Caravaggio by virtue of his hometown, painted his The Denial of Saint Peter, an oil-on-canvas depiction of St. Peters renunciation of Jesus and disavowal that he was a disciple of Christ. Though it passed through the hands of several cardinals over the centuries,[1] the work itself was not commissioned by any religious authority, and was entirely conceived by Caravaggio. It currently is on display at the Metropolitan Museum of Art.   Ã‚  Ã‚  Ã‚  Ã‚  The most important aspect of the work stems from its era: Caravaggio painted in the early Baroque period, a time in art largely focused on emotion, drama, and realism in the portrayal of humanity, as opposed to the idealized, somewhat emotionless scenes of the Renaissance.[2] The Denial of Saint Peter is a prime example of this trend, for, as opposed to depicting idealized human forms in a heavily structured and adorned setting, it portrays just three figures, all of whom are imperfect, human, and express clearly visible emotion. While Caravaggios subject matter is far from unique, his distinctive approach toward its illustration is revolutionary with respect to earlier Renaissance art; of course, it resembles other works from the Baroque period, which Caravaggio himself helps to usher in. The drama and emotional anguish of Caravaggios work is apparent even upon first glance. Upon examining the figures in the work, we see that Saint Peter is far from flawless and virtuous; instead, he is easily intimidated by a soldier as he frantically distances himself from Christ, pointing at himself incredulously as if to appear utterly surprised at the notion that he is somehow associated with Jesus. Peter lacks the saintly character attributed to Biblical figures in earlier works, for he has deeply furrowed brows and looks pale and sickly in the harsh light shining on him-in fact, he more closely resembles a cowardly man eager to appear common and nondescript. The woman and the soldier have powerful emotional elements in their depictions as well-the soldier appears threatening, seemingly warning Peter of the consequences of allying with Christ, while the woman bears a stern expression that signals her certainty of Peters solidarity with Jesus. Finally, the sheer size of the figur es is noteworthy, for it places all emphasis on them and on no other point in the painting. Caravaggios stylistic effects, in addition to the figures expressions, also lend the painting a dramatic air. The first and most obvious such technique is his use of lighting: specifically, the work has extreme contrasts between light and dark, which, due to their harsh appearance, convey an almost theatrical impression to the viewer. In fact, Peters head is fully and strongly illuminated, while the soldiers visage, though just opposite his, is barely visible; the womans face, furthermore, is alternately obscured and lit-with little or no attempt to mediate the two extremes. This consistent use of dramatic lighting, which in this case radiates only from the left of the painting, is termed â€Å"chiaroscuro†; in fact, Caravaggio used it so often that his version of the technique is labeled â€Å"tenebrism.†[3] The effect that these techniques have on a work is profound, for they create a powerful sense of tension in the piece because of their stark, almost jarring appear ance. In The Denial of St. Peter, this effect is quite noticeable, for by illuminating Peter, but not the soldier, the sense that Peter is being interrogated and pressured becomes heightened; it is almost as if a spotlight is on him, coercing him into giving a reply. Another important stylistic note is the varying level of detail Caravaggio applies to parts of the work. The background is not at all important, as is demonstrated by the broad, carefree, almost haphazard brushstrokes and lack of any remarkable detail behind any of the figures; by contrast, Peter, the soldier, and the woman are all painted with exceptional detail, exemplified by the soldiers helmet, which is ornately and intricately decorated, and Peters face, which has distinct furrows and creases. This again serves to highlight the fact that the three figures and their emotional tension are the central features of the work and that all else is ancillary. Caravaggios work closely mirrors others of the Baroque period. Spanish artist Juan de Valdà ©s Leals Pietà  , painted between 1657 and 1660 and currently on display at the Metropolitan,[4] features many of the same techniques Caravaggio uses to enhance the dramatic effects and emotional impact of the work. The use of chiaroscuro is immediately apparent, for the Virgin Mary and Christ are both well-lit, while the background is mostly darkened. As in Caravaggios work, this element lends the work a powerfully dramatic aspect and compels the viewer to focus on the subject matter and its intense psychological themes. Furthermore, Christ is an emaciated, bloodied figure, as the stigmata bleed profusely in the painting; Leal portrays him as a tortured, weakened man, unlike prior depictions of a handsome, nourished Christ. He has a gaunt, starved body, reflecting the anguish Leal wishes to convey, and the Virgin Mary looks on with a combination of anger and pain, a radical departure from the mostly serene Mary seen in earlier works. The overall tone of the work is one of anguish, a theme reinforced by Leals manipulation of light and the graphic, disturbing depiction of Christ. Renaissance works, while portraying similar religious subject matter, are radically different from Caravaggios painting and other Baroque art. Raphaels Pietà   of 1503, part of the Colonna Altarpiece and currently in the Gardner Museum,[5] while depicting the very same subject as Leals work and certainly portraying grief and suffering, conveys an entirely different emotional character and lacks the psychological depth seen in either Caravaggios or Leals piece. Of first note in Raphaels Pietà   is the size of the figures; they are proportionately smaller when compared with Caravaggios, somewhat reducing their impact on the viewer. Additionally, the lighting in the painting is mostly uniform, and thus lacks the striking contrasts found in Caravaggios work that impress the viewer with emotional immediacy. The figures themselves also lack any poignancy. The Virgin Mary is largely expressionless, and while a man to the left seems to lament the death of Christ, the level of drama and anxiety seen on St. Peters face is missing. Also of note is the fact that Christ appears as a nourished, healthy figure, and thus does not inspire the viewer with grief or sorrow. Thus it is apparent that this work portrays an idealized scene suited perfectly to Renaissance standards, and therefore has little in common with the flawed, emotional figures of Caravaggios or Leals work. In short, Caravaggios large, overtly sentimental figures, combined with his extreme uses of light and lack of attention to background detail, produce a work that impresses the viewer with its passion, tension, and dramatic tone. As we can see, this is entirely consistent with Baroque art, for the similarities with Leals work are immediately evident. Caravaggios Renaissance predecessors depict idealized and romanticized figures that lack the emotional involvement suitable for their subject matter. By contrast, Caravaggio strives to represent and amplify human tensions and imperfections, achieving a compelling realism. Sources Stokstad, Marilyn. Art History. Revised Second Edition, Volume 2. Upper Saddle River, New Jersey: Pearson Education, 2005. â€Å"Caravaggio (Michelangelo Merisi). The Denial of Saint Peter (1997.167)†. In Heilbrunn Timeline of Art History. New York: The Metropolitan Museum of Art, 2000-. http://www.metmuseum.org/toah/hd/crvg/ho_1997.167.htm (March 2010) Raphael. Pietà  . 1503-1505. www.gardnermuseum.org/collection/raphael_p16e3.asp (March 2010) Leal, Juan de Valdà ©s. Pietà  . 1657-1660. http://www.metmuseum.org/works_of_art/collection_database/european_paintings/pieta_juan_de_valdes_leal/objectview.aspx?collID=11OID=110002315 (March 2010) â€Å"Caravaggio (Michelangelo Merisi). The Denial of Saint Peter (1997.167)†. In Heilbrunn Timeline of Art History. New York: The Metropolitan Museum of Art, 2000-. http://www.metmuseum.org/toah/hd/crvg/ho_1997.167.htm (March 2010) [2] Stokstad, Marilyn. Art History. Revised Second Edition, Volume 2. Upper Saddle River, New Jersey: Pearson Education, 2005,p. 722. Stokstad, Marilyn. Art History. Revised Second Edition, Volume 2. Upper Saddle River, New Jersey: Pearson Education, 2005,p. 735, 744. Leal, Juan de Valdà ©s. Pietà  . 1657-1660. http://www.metmuseum.org/works_of_art/collection_database/european_paintings/pieta_juan_de_valdes_leal/objectview.aspx?collID=11OID=110002315 (March 2010) Raphael. Pietà  . 1503-1505. www.gardnermuseum.org/collection/raphael_p16e3.asp (March 2010)

Canadarm :: essays research papers

Canadarm 2 The Canadarm 2 is a very important contribution from Canada, to the international Space station. Its complex design allows it to move through out the international space station and supply the station with useful tasks.   Ã‚  Ã‚  Ã‚  Ã‚  The Canadarm was launched form earth on the shuttle flight #104 witch is also known as Endeavour. On April 2001 the Endeavour was caring much more then just the Canadarm, it was caring the crew who would install the new Canadarm to the international space stations. The crew on the shuttle was Kent V. Rominger, Jeffery S. Ashby, Chris A. Hadfield, John L. Phillips, Scott E. Parazynski, Umberto Guidoni and Yuri Lonchakov among these astronauts was Chris A. Hadfield the first Canadian who walked in space? Chris Hadfield graduated from Milton District High School in 1977, after that he joined the Canadian armed forces in May 1978. Then for the next two years he attended Royal Roads Military College, Victoria B.C., then he in rolled for 2 year in Royal Military College, Kingston, Ontario, he graduated with a mechanical engineering degree. He then pos t-graduate research at the University of Waterloo, Ontario in 1982, then managed to get a Masters of Science degree in Aviation Systems from the University of Tennessee in 1992. Chris Hadfield was 1 of 4 to be picked as Canadian Astronauts from a field of 5,330 in June 1992. Chris Hadfield flew as the first Canadian mission specialist, the first Canadian to operate the Canadarm in orbit, and the only Canadian to ever visit Mir   Ã‚  Ã‚  Ã‚  Ã‚  Chris Hadfield helped install and operate the Canadian arm wall he was in space. He also earned the title of the first Canadian to walk in space. The Canadarm was designed by M.d Robotics to not have any fixed ends so it could crawl along the space station to repair or to move parts on the Space Station. The Canadian arm is 17.6(55ft) long with 7 motorized joints that can turn 540 degrees. The arm is controlled by an astronaut inside the space station, the astronaut is able to see through 4 color cameras that will help him control the arm in how it’s suppose to be used. The arm is designed to carry up to 255,736 pounds of space station material off and on the space station. The arm will have to be used to move every thing into place on the space station. Its main goal will be to make the astronaut’s job a lot easier and safer by the arm doing the most of the work.

Racism and Prejudice

Racism and Prejudice It is undeniable that in deed race matters. The four selections in this chapter and the Linda Lin article, talk about different kinds of racism and prejudice, all of them true and all of them equally detrimental. I think this country is far from being perfect and from not having racism or prejudice problems. Nevertheless, is undeniable that it has come a long way (President Obama) since the time of slavery and more recently Jim Crowe laws and the harassment that was brought against blacks.Later, recognized as the solution needed to afford minorities’ equal opportunities both in work and in school, Affirmative Action, was hailed as the leveler of the field. There certainly is no doubt that in the 1960's at the epicenter of the civil rights movement, that the government had an obligation to pass legislation aimed at equalizing the races on at least a social level. The question now has become whether or not Affirmative Action has passed its time. Does this on ce very necessary legislation now in today's society do more harm than good?There is all kind of racism if you include prejudice too. It has been going on since beginning of time. Maybe it is sometimes a person's own insecurity that makes them think everything is attributed to race. The truth is that each group tends to be prejudiced against the other. Some are angry because some people lay around and collect government money and some are angry because they blame another class for what they cannot achieve, or for past mistakes made some hundreds of years ago.I think far too many of us speak of equality and hope, yet secretly rationalize hate, based on little more than stereotypes and stories of atrocities that happened generations ago. Sadly, this is still a racist culture. The question is not â€Å"Am I a racist? † The question is â€Å"To what degree am I a racist? † â€Å"To what degree am I aware of my racism? † The selection from Jana Noel made me think abo ut those questions.At first I thought I am not a prejudice person and I am not racist, then I thought of little things I have done and indeed I do engage in racist behaviors like I find myself at a higher level of alertness when I am outdoors at night in the vicinity of a man of African descent. Behaviors like that are considered â€Å"micro insults. † I am more mindful of them now. However, unfortunately I acknowledge that I still engage in these barely conscious behaviors. Reading Noel I can associate the way my prejudice was form with the social control theory.There is no other explanation why I would react like that. That is certainly not something that my parents taught me. Most White Americans will tell you, that they are not racist individuals. Nevertheless, if you could delve deeper into their minds, you would discover that many of them have reasons that they believe justifies racism. Among those reasons or excuses, we found the reverse discrimination of Affirmative A ction, ignorance of other races and cultures, and the belief in the need for retribution for past injustices.Whites in America should start by admit the reality and begin to work under the assumption that this is a racist society. As we read in McIntosh and Sleeter articles, the white people in the United States have benefited from the structure of racism, whether or not they have ever committed a racist act, uttered a racist word, or had a racist thought. The same way minorities suffer in a white society because they are Black, Hispanics, Asian, Jewish, etc, Whites benefit because they are White. These minorities have grown up with racism and prejudice.One of the most difficult tasks in life to accomplish is to overcome the core fundamental principles that you are taught as a child. A child who grows up witnessing racism, as a way of life, is likely to become a racist adult. The world, in which we all live, is the same society in which our children and our children's children will one day be. It is our duty as parents and teachers to see that future generations have the best opportunity at thriving in an equal world. Only through tolerance and understanding can we ensure equality for all in this country.

How does Miller present Catherine growing up in A View From the Bridge Essay

Over the course of the play, Miller presents Catherine’s growing sense of independence in the Carbone household. At the start of the play Catherine is portrayed as reliant on Eddie, adopting a domestic role, as well as naive and emotionally immature. After Marco and Rodolpho’s arrival, she quickly starts to become aware of her sexuality and starts to assert her independence and begins going against what Eddie says. By the end of Act 1 Catherine is able to talk back to Eddie and defies his orders and starts to see him as negative figure in her life. Miller uses Catherine to show how stereotypes of female behaviour are being challenged in Red Hook. When the audience is first introduced to, Miller presents her as the stereotypical housewife, as shown through the stage directions â€Å"enter[ing] from the kitchen†. The reference to the kitchen suggests that Catherine’s role is confined to that of a housewife; in addition her â€Å"look[ing]† for Eddie implies she eagerly waits for his return, much like a partner would. Her domestic role is further reinforced when Miller has her â€Å"get [Eddie] a beer† an action intended for a wife rather than a daughter. Catherine’s eagerness to please Eddie is further demonstrated when Miller has her â€Å"turn for him†. This shows not only her eagerness but also her naivety, as without questioning his orders she willingly puts her body on display for him. Her naivety is further explored when she â€Å"light[s]† Eddie’s cigar for him. Lighting a man’s cigar is seen as a romantic gesture, done between husband and wife, so the fact that Catherine fails to recognise the significance behind her actions goes to demonstrate her ignorance towards adult situations, further cementing in the audience’s mind that she acts like a child. Miller uses Catherine’s interactions with Beatrice to show how childlike she is despite her age. A notable example of this is when Beatrice says to her â€Å"go baby, set the table†. In this line the word â€Å"baby† could be seen as a term of affection that Beatrice has for Catherine – a likely assumption as she is Catherine’s mother figure. However it could be seen as having a hidden meaning; it could to show how Beatrice unknowingly views Catherine, as a baby. This is evidenced by the fact that Beatrice is commanding Catherine by telling her to â€Å"set the table†. After Marco and Rodolpho arrive Miller begins to show the first signs of Catherine’s increasing independence. Through her relationship with Eddie we start to see her break away from his control and start to gain some authority. This is shown when she tells Rodolpho to â€Å"go ahead [and] sing it†. This is a significant moment as it is the first instance in the play where Catherine takes a role of authority and commands someone else. Additionally slightly further on she tells Eddie to â€Å"leave him finish†. This goes directly against what Eddie was just telling Rodolpho and is the first instance in which Catherine challenges Eddie’s authority. This goes along with the first quote go to show just how much she has changed from when we first met her; she has gone from completely dependent on Eddie and has begun to start to challenge him. Catherine’s interactions with Beatrice begin to show how she has started to drift away from what’s expected of her as a stereotypical woman. Miller develops this idea through the fact that throughout the scene Catherine has been ignoring the duty given to her by Eddie, to get the guests coffee, and has forced Beatrice to take the job and â€Å"get the coffee† herself. This moment signifies the point where Catherine starts to no longer act as a wife towards Eddie, and allows Beatrice to take that role once again. Miller uses Catherine’s and Rodolpho’s relationship to show how she is maturing sexually. From the start Miller makes it very clear from the start that Catherine is interested in Rodolpho when he describes her as â€Å"wondrously† asking him a bout his complexion. Catherine’s intentions are given away here, as wonder is a strong feeling to have for someone she has just met. This is further emphasized when she exclaims once again about his appearance, saying â€Å"He’s a real blonde!† showing that she is so captivated with his appearance that she cannot believe what she is seeing. Another point that reinforced this idea is when she describes his singing by saying â€Å"he’s terrific, it’s terrific†. This switch from â€Å"he† to â€Å"it† could imply that Catherine might be so infatuated with Rodolpho she can not help complimenting him and must correct herself in order to hide the fact that she does feel love attraction towards him. Finally she later goes onto ask Rodolpho if he â€Å"like[s] sugar† this is a sexual comment veiled as a question and goes to show Catherine’s growing sense of sexual maturity. By the end of Act 1 Miller has shown Catherine to become more independent, this is first demonstrated through how her relationship with Eddie has changed. Firstly, Miller portrays Catherine to be far more forward with Eddie as shown when Catherine is described as talking to Eddie with â€Å"an edge of anger†. Her now being â€Å"anger[ed]† is a big change from how the audience originally viewed Catherine’s thoughts on Eddie- a childlike figure who relied heavily him. Furthermore, the change in her behaviour is emphasized by the fact that she can now assert some form of dominance over Eddie, as shown by the fact the he â€Å"retreat[s] before the threat of her anger†. Secondly Eddie himself starts to see that Catherine is maturing and growing up as shown when he says, â€Å" you’re a big girl†. However the use of the words â€Å"big girl† suggest while he may acknowledge that she is growing up he still does not view her as an adult as many others are starting to do. Beatrice is one of those who recognises that Catherine is maturing, and helps her in doing so. She tells Catherine throughout their conversation that she’s â€Å"not a baby anymore†. â€Å"Baby† was the term of affection originally used by Beatrice to refer to Catherine, so her telling Catherine that she is no longer a â€Å"baby†, implies that Beatrice no longer sees her as a child and that she is trying to convince Catherine that she is growing up to be a woman. Finally, Miller uses her relationship with Rodolpho to show how she has now gained independence and is able to defy Eddie. The most notable example of this is when she asks Rodolpho if he â€Å"wanna dance†. This comes right after when Eddie starts questioning Rodolpho on the way he behaves while he is out. Catherine asking Rodolpho to dance serves to act as a gesture of rebellion whose purpose is to show to Eddie that Catherine is now able to think for herself and goes to demonstrate that she no longer needs his approval on what she can and cannot do. Miller uses Catherine to explore the developing theme of womanhood and the struggle for female independence and by doing so he also uses her to challenge the traditional stereotypes that females in Red Hook, and by extensions the world, face.

Segnaletica e arredo nel design dellospitalitagrave;

Segnaletica e arredo nel design dellospitalitagrave; SEGNALETICA E ARREDOElena TurazziniPOLITECNICO DI MILANOFACOLTA' di DISEGNO INDUSTRIALE A.A. 2002-2003Molto di quello che si dice e si scrive ÂÆ' inquinamento. (Marshall McLuhan)SEGNALETICA: serve a segnalare, a far riconoscere, ad informareSEGNALE: segno convenzionale per indicare o far conoscere qualcosaINDICARE: far vedere o far capire con cenni, parole o segnalisuggerire, consigliare, prescrivere, rivelare, lasciare intendere, manifestareLa segnaletica come comunicazione e orientamento ha bisogno di un'efficiente organizzazione e progettazione;richiede di coniugare cempetenze tra loro diverse: bisogna tenere conto delle nuove tecnologie, delleconvenzioni, della progettazione grafica, di sociologia e psicologia. Deve informare (letteralmente significa"formare" , dare una forma a qualcosa di nuovo, che seppure esistente, non ? ancora stato definito).in grado di facilitare agli utenti un pronto e sicuro orientamento, e perch? no, anche un miglioramento estetico.esigenze di leggibil it , di durata, di intercambiabilit e di design, di modularit , flessibilit , robustezza eantimanomissioneUn sistema comprende segnavia principali e intermedi, segnaletica di sicurezza, di avvertimento, di divietoe di emergenza, in particolare si possono elencare: posatavoli, moduli informativi su piedistallo, targhe aporta e a muro, pittogrammi, ecc.Extraordinary Canadians: Marshall McLuhanMolte ditte producono sistemi di segnaletica completi per esterni e per interni che rispondono a qualsiasiesigenza, con un ampio assortimento di segnali standard, studiati appositamente per alberghi, hotels e centricongressi. Sono realizzati in alluminio, con finitura oro o argento a specchio e nei colori standard di verniciatura,nel classico "in stile" tipico degli alberghi, a imitazione di quello del grande albergo internazionale dei primidel XX secolo.Alcuni tipi di alberghi invece, come i design hotels, creano su misura la propria segnaletica. In un primomomento perch? la ricerca estetica dei prodotti in commercio non corrisponde con l'attuale ricerca del design,(ma come detto prima...

Interplanetary Internet from NASA’s experiment The WritePass Journal

Interplanetary Internet from NASA’s experiment   ABSTRACT Interplanetary Internet from NASA’s experiment   ABSTRACTCHAPTER 1: Introduction1.1 Background and Context1.2   Motivation to DTN:1.2.1 Challenged networks/environments for Internet1.2.2 Challenges due to Mobility1.3 DTN concept: Solution to Challenged environments and mobility2.4 DTN Denial of service attack (DoS): Motivations1.5 Objectives of Project1.6 Overview of Dissertation:CHAPTER 2: States2.6 Routing in DTN **2.6 Threats in DTN2.7 Denial of Service Attacks:2.8 Resource consumptionCHAPTER 3: My proposed approach to DOS in DTN3.1 Introduction3.1 Scenario3.2 Background/Review of Security and DOS in DTN In Literature3.3 Attack Model3.4 Authentication3.5 Routing Model3.6 Mobility Model3.7 Attack types3.8 Assumptions3.9 Proposed Resilience Mechanism3.10 Simulation model and parametersResult Matrices:One Simulator (used for simulation)Work doneOne simulator test runsFuture workCHAPTER 4: Conclusion4.1 Project Work Plan5: ReferencesRelated   ABSTRACT Internet has already revolutionized the way we live and work, but it is still in its infancy in some areas to provide ubiquitous connectivity in future. To solve the problem of Ubiquitous connectivity in communication challenged areas Delay Tolerant Network (DTN) provides an opportunistic networking architecture. Opportunistic networks represent a class of networks where end-to-end continuous connectivity between source and destination is intermittent [1]. There are variety of challenged areas like areas as high latitudes, war prone areas or disastrous scenario where environmental considerations create impossibility for conventional mobile telephony and satellite coverage is inadequate or economically infeasible or because of infrastructure deployment constraints, or power source availability, or because of government policy decisions do not allow access. Moreover, DTN seeks to address the technical issues in heterogeneous networks to use every possible feasible access method to provide internetworking among existing types of wireless or wired networks like Internet, Mobile and WLAN [7]. Integrating DTN capabilities with the existing TCP/IP based Internet it aims to deliver Internet-like communications even for long variable delay, asynchronous as well as interrupted heterogeneous environment where existing transport protocol and congestion control mechanism have limitations [1].   Basic DTN architecture by IETF RFC   involves use of ‘Bundle protocol’ which allows communication over multiple hops by means of ‘custody transfers’ and  Ã‚   messages   in DTN are routed in   store-and-forward manner on each node[2]. Research and development going on over last ten years has set out some challenges that need more focus before DTN becomes a day to day reality. In this Interim report I am focusing on Denial of Service (DoS) attacks due to open channel and multi-hop DTN transmission characteristics which can limit its full utilisation. First I will review the state-of-art in context of DTN security and attacks at present then I will analyse possible DoS attacks in DTN and their countermeasures. I will present a comprehensive resilience mechanism to address the identified attacks, focusing on a critical metrics of performance. I will propose a simulation model and demonstrate the effectiveness of the newly proposed techniques through simulation using ONE simulator.    CHAPTER 1: Introduction 1.1 Background and Context The emergence of the idea of Delay tolerant networking started in late 1990 as ‘Interplanetary Internet’ from NASA’s experiment of deep space, high delay, store-and- forward networks [5]. That early work focused on protocols suitable for very long propagation delays of deep- space- interplanetary communications. Other early work includes military specific Disruption-Tolerant Networking due to scenarios of long delayed links, broken or intermittent links. Extending initial work purpose in 2002-03 researchers looked at other applicable scenarios, like terrestrial wireless networks, wireless sensor networks and other local area networks, where communication opportunities were not much certain. DTN has shown its suitability and strength to applications having long or unknown delays due to frequent disconnections and for interconnecting various heterogeneous networks, which commonly is not   a conventional IP-based network. The development of wireless communication technologies made the Internet ubiquitously. Within the vision of ‘any time anywhere’ networking, efficient internetworking among existing types of wireless networks is inevitable. Integrating DTN networks as another access method into the existing network infrastructure allows the Internet to reach people who are hundreds of kilometres, or more away from existing infrastructure.   Although Internet has already revolutionized the way we live and work, but it is still in its infancy in some areas. Challenges faced by current Internet Today’s Internet is based on end-to-end network connectivity based TCP/IP protocol model. It makes certain fundamental assumptions like continuous source destination   connectivity, end – to- end low delay paths, low transmission error rate and bidirectional symmetrical data rate which applies a number of constraints to its reachability[1][5]. So the overall vision [6] of Future Internet should be to provide ubiquitous and pervasive networking for the users and applications in well-connected regions with keeping in mind communication challenged areas. The current Internet must develop to be more able of dealing with new evolving forms of content and their consumption but there are many challenges in the wide range of application requirements related to network heterogeneity as well as by the growing number of non-TCP/IP networks and mobile devices. 1.2   Motivation to DTN: 1.2.1 Challenged networks/environments for Internet Some regions are called ‛communications challenged’ because they have little or negligible infrastructure that is required to support modern wireless and wired Internet communications. These Challenged environments are very heterogeneous and have characteristics [1] [5] such as End-to-end path may not exist creating Intermittent connectivity Node reachability and density may be Predictable (Planetary dynamics, scheduled vehicles, message ferries) Unpredictable (Sparse sensor networks, data mules, vehicular) Semi-predictable (animals, vehicles, etc.) Large, unpredictable,   variable delays for transmission (deep space- moon: 3s, Mars: 2min, Pluto: 5h) Asymmetric/ asynchronous data rate which may be very low (acoustic underwater modems: 1 bit/s–few Kbit/s) High bit error rate (wireless, underwater, satellite) Using different transport protocols in different parts of the network making interactive communication impossible/ inefficient or unreliable Environment having very large round trip times (deep space, military or remote area communication) Many of the challenges have been tried to address using Performance Enhancing Proxies (PEPs) which try to solve high delay low bit rate links performance but it still demands end-to-end connection. 1.2.2 Challenges due to Mobility Mobility may create potential disconnection in end-to-end connectivity which produces challenges for current TCP/IP based Internet in form of: Communication link availability (not ubiquitous due to movement Limited Transmission range Communication link specially interactive communication link   may be costly due to frequent movement of nodes Link may be unavailable due lack of battery power or storage Although Ad-hoc and Peer-to-Peer networks may solve the problem to some extend but there are limitations due to not enough mobile nodes available or willing nodes or nodes with incompatible devices. 1.3 DTN concept: Solution to Challenged environments and mobility DTN aims to provide solution for challenged environment where no end- to-end connection is available or it is disrupted. Delay Tolerant Network is a network over underlying heterogeneous networks having opportunistic encounter driven ‘store, carry and forward’ approach to provide connectivity on hop-by-hop basis.   Most discussed     current approach to DTN is centred on an overlay protocol called the bundle protocol (BP).[11] 2.4 DTN Denial of service attack (DoS): Motivations DTN transmission is open channel and multi-hop which makes attacks in such situations an easier task. Traditional mechanisms to mitigate these attacks are not well sufficient to challenge environments where nodes are not connected for long periods of time and direct end-to-end communication is not possible and resources are scarce. Most of the solution available so far in literature address security in general and does not give attention to Denial of Service aspects in DTN. DoS is the most common attack in Internet communication and in DTN environments due to   longer delays DoS attempts will be   more effective. So there is need for more research explicitly considering DoS at all times. 1.5 Objectives of Project Study of delay tolerant network (DTN) architecture, its concepts and Bundle layer and how they differ from current networks, giving more emphases on security and attacks.   First I will review the state-of-art in context of DTN security and attacks at present then I will analyse possible. Identify the common DoS attacks and their countermeasures, focussing   on a scenario of communication in delay tolerant networks comprising mobile nodes. To design develop and test some resilience mechanism mechanism to address the identified attacks (nodes with address spoofing, false authentication and packet flooding), focusing on a critical metrics of performance using Simulator Simulation result will show how performance of a DTN network suffers when no Resilience scheme is used. 1.6 Overview of Dissertation: First I will review the state-of-art literature review in context of DTN architecture, security and analyse possible DoS attacks in DTN and their countermeasures. Then (in Ch-3) I will present an attack model and resilience mechanism for DoS attack. In next sections will follow ONE simulator overview and future work in direction of achieving objectives of project with Gantt chart and finally conclusion and references. CHAPTER 2: State-of-The-Art and Literature Review 2.1 Introduction DTN aims to provide usable Internet-way communications for long variable delays, asynchronous as well as interrupted heterogeneous environment where existing transport protocol and congestion control mechanism have limitations [1]. 2.2 Delay Tolerant Network history and Overview Delay Tolerant Networks (DTNs) have become a hot research topic among researchers and academicians since it was proposed by Kevin Fall in 2003 SIGCOMM seminar paper [1]. Vinton Cerf who is recognized as â€Å"one of the fathers of Internet† contributed in designing and defining its reference   Architecture [2] in DTNRG for IETFdraft of   RFC-4838. Basic DTN architecture by Internet Research Task Forces Delay-Tolerant Networking Research Group (IRTF DTNRG) involves use of ‘Bundle protocol’ which allows communication over multiple hops by means of ‘custody transfers’ and  Ã‚   messages   in DTN are routed in   store-and-forward manner on each node[RFC-5050]. 2.3 Delay Tolerant Networking Definition and Contexts of DTNs in Literature A delay- or disruption-tolerant network has been defined in several ways in literature. In [1], the DTN is defined as challenged networks, which may not follow the assumptions of the Internet. In [2]RFC-4838 describes it as   occasionally and opportunistically -connected networks that may comprise more than one   different   set of protocols. It includes a hop-by-hop transfer of message for reliable delivery. A DTN as stated in [5] was defined as a network of regional networks, where it serves as a store-and-forward overlay on top of (and providing interoperability between) regional networks (Internet, the MANETs, sensor network or any other network). 2.4 Constraints in Delay Tolerant Networks Node Constraints includes (a) Limited Memory (b) Limited and unreliable Power and Energy (c) limited transfer time for messages. Network Constraints are (a) Unreliable Communication (b) Collisions and latency Physical Limitations are (a) Unattended after deployment (b) Remotely managed Link constraints  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚      (a) long and varying delays (b) changeable mobility pattern of devices In Opportunistic networks such as Sensor/Actuator networks that use scheduled intermittent connectivity (to conserve power), because they have extremely limited node power, storage memory, and CPU processing capability. In Vehicular networks which use opportunistic (unpredictable) contact for message delivery. In Satellite networks having   medium delays or periodic connectivity In Terrestrial wireless networks that connect mobile devices, including PDAs etc. In Underwater acoustic (sensor) networks having frequent interruptions with moderate delays. Outer (deep)-space networks (InterPlaNetary (IPN) Internet project). Military Ad-hoc Networks such as a military battlefield where systems operate in highly hostile environments having mobility, bad environmental factors, or regulations causing disconnections like intentional jamming. In Rural villages or developing regions low cost and remotely located networks that non-interactively and occasionally communicate with the Internet. For example remotely located schools, kiosks and computer centres are linked on occasional basis using satellite and data mules or local transport infrastructures. In sparsely connected ad hoc networks where some wireless devices or networks may fall outside the required communication range of each other. 2.5 Major DTN Applications and Examples Example of Projects involving DTN: [6,7] Diesel net. Haggle, Interplanetary Internet, BBN’s SPINDLE project,   FirstMileSolutions SeNDT Sensor Network with Delay Tolerance, Saratoga and HTTP-DTN, SNC Project, N4C Project, ZebraNet, FidoNet, SUMOWIN, Shared Wireless Infostation Model (SWIM) at Cornell, The Mindstream Project at the University of Waterloo School of Computer Science, Time Equals Knowledge (TeK),World Wide Web Offline Explorer (WWWOFFLE), Bytewala DTN, Chianti, IBR-DTN etc. 2.6 Routing in DTN ** Traditional routing protocols operate under the assumptions of continuous connectivity, low delay and very low packet loss rate but in case of DTN opportunistic and disconnected links new routing protocols and system architectures are required to be developed. There are various types of DTNs based on their characteristics, but allows great flexibility for routing protocols in these networks based on their specific requirements. There are several DTN routing schemes proposed in the literature. Four major ones could be Epidemic routing: Epidemic routing simply makes multiple copies of packets to flood the network in a hope that any one of them will be delivered to the destination. This protocol performs best in terms of packet delivery and latency when network bandwidth and storage are unlimited. But it is not the case in practice. PROPHET: estimates delivery predictability to destinations using the history of encounters. MaxProp: computes a rank for each packet in terms of delivery probability and sorts packets in the transfer buffer accordingly. Upon transfer opportunity, packets are replicated in the order of their ranks Spray-and-Wait: follows a flooding scheme, but limits the total number of copies per packet. 2.6 Threats in DTN To understand the topic I will first examine the terminology, then the definitions of threats and DoS followed by discussion why DoS is potential problem in DTN. Security and attack literature reviews are given in next chapter. Threat: [20] Any circumstance or event (such as the existence of an attacker and vulnerabilities) with the potential to adversely impact a system through a security. Attack: Attempt to gain unauthorized access to a service, resource, or information, or the attempt to compromise integrity, availability, or confidentiality. It is irrelevant to success, which may or may not. Non DTN node threats:   The first set of threats considered were those coming from network   Ã‚  Ã‚  elements which are not directly part of the DTN.   As an overlay   Ã‚  Ã‚  network, bundles typically traverse multiple underlying networks.   Any vulnerability in the bundle protocol can be exploited at any of those network elements [13]. Denial of Service (DoS): Classically, the definition of denial-of-service (DOS) involves three components: authorized users, a shared service, and a maximum waiting time [20][13]. In DoS Authorized users are said to deny service to other authorized users when they prevent access to or use of a shared service for longer than some maximum waiting time. More generally to denial-of-service in DTN: The result of any action that prevents any part of a DTN from functioning correctly or in a timely manner so that intended user cannot use it.   It is directly a breach to availability [20]. 2.7 Denial of Service Attacks: [3]In addition to the basic resource consumption threats mentioned above there is also a range of denial of service (DoS) attacks which must be considered in the DTN context. DoS attacks can be mounted at any layer, from physical to application. In a DTN environment, the generally longer latencies involved will probably act to make DoS attempts more effective. As with all networks, security mechanisms will themselves create new DoS opportunities.   Therefore whatever services and mechanisms are defined for DTN security should explicitly consider DoS.   For example, mechanisms which involve certificate status checking (via some protocol to a key) based on received messages create new DoS opportunities since such lookups consume resources on both the receiving node and the key server. Common DoS attacks: Attacks that are common to DTNs are Dropping of packets, Flooding the network with unnecessary spurious packets, Spoofing a different node’s address to intercept all the packets destined to that node, orrupting routing states and Counterfeiting network acknowledgments Resource consumption (Battery exhaustion, creating routing loops) 2.8 Resource consumption Due to the resource-scarcity that characterizes DTNs, unauthorized   Ã‚  Ã‚  access and use of DTN resources is a serious concern.   Specifically, the following can consume DTN resources and be considered threats   Ã‚  Ã‚  against a DTN infrastructure [13]: 1.   Access by unauthorized entities, 2.   Unauthorized applications controlling the DTN infrastructure, 3.   Authorized applications sending bundles at a rate or class of   service for which they lack   permission. 4.   Unauthorised bundle content modification -tempering 5.   Compromised network elements, be they DTN nodes or not. In addition to these threats, DTN nodes can act to assist or amplify  Ã‚   such resource consuming behaviour as follows: Forwarding bundles that were not sent by authorized DTN nodes. Generating reports not originally requested (e.g. if a bundle has been modified) Not detecting unplanned replays or other misbehaviours. DoS prevention: As described above, denial-of-service is a breach of the security characteristic of availability. Along with availability, confidentiality and integrity are the primary concerns of security. DoS cannot be prevented because most attacks leverage the use of routing and other network activity but there are countermeasures to mitigate it like: Spread spectrum techniques (using network coding) Proper authentication using either Public-key cryptography (computationally expensive) or Fast symmetric-key cryptography must be used sparingly Currently work has been done using Identity based cryptography (IBC) or Hierarchical based cryptography (HIBC). DTN Security Requirements: [5] According to DTNRG The emphasis of DTN security is on protecting the DTN infrastructure from unauthorized access and use Prevent access by unauthorized applications, Prevent unauthorized applications from asserting control over the DTN infrastructure, Prevent authorized applications from sending bundles at a rate or class of service for which they lack permission, Promptly detect and discard bundles that were not sent by authorized users, (early detection within infrastructure rather than at destination), Promptly detect and discard bundles whose headers have been modified Promptly detect and disable compromised entities Secondary emphasis is on providing optional end-to-end security services to bundle applications. CHAPTER 3: My proposed approach to DOS in DTN 3.1 Introduction In this section I summarise my analysis of previous work done in the areas of security and attacks in DTN, especially Denial of Service in DTN. Also I identify conditions that are can materialise an attack materialise. Then I show that based on these conditions the attack effectively happening in a representative model, with a set number of nodes and chosen network topology, routing schemes and security scheme. I also demonstrate that security and privacy are crucial in DTN and using cryptographic techniques we can secure DTN. I assert that because of constrained nature of DTN, participants have limited access to Trusted Authority. In view of these constraints, I propose a model based on a symmetric and asymmetric key cryptography to mitigate DOS attacks in DTN. My model is based on prior creation and distribution of keys to participants at setup stage, where each trusted participant knows keys of others. 3.1 Scenario My scenario is based on IETF DNRG architecture on Delay tolerant network. There are multiple operating groups in this DTN. Each group has its own trusted and well known registering agency/organisation which can work as an affiliation agency or service provider. These could be any mobile service provider or any company which will register its employees and knows them prior or any university/school/hospitals which can register members by verifying their identity and credentials. This means that members of this group are now trusted and known and are not malicious. With this set up we have limited authenticated participant nodes and we can avoid any malicious activity by unknown/ untrusted nodes. Such network is a special DTN and can also be useful for example in a conflict zone where participation by anonymous nodes is not desired. I consider a scenario in which these mutually trusted DTN mobile nodes exchange messages within its group (using PDA/Bluetooth devices/mobile phones) with one another after authentication phase is successful. Fig1: Used Scnario 3.2 Background/Review of Security and DOS in DTN In Literature Here I will discuss solutions and reviews based on literature survey on DTN security and DOS attacks. There is a particular lack of research papers addressing DOS attacks in DTN. Most work is based on assuming that routing or security mechanism of DTN will prevent DOS to some extent. Nevertheless these schemes can never underlie the necessity of authentication protocols. Farrell and Cahill [11] review the current state of DTN security work inspired by Internet. They identify and analyse threats for DTN and the security requirements in bundle protocol. Then they discuss open issues in bundle security and implementation issues in DTN security as follows. (1.) First set of threats are from outside network due to being overlay nature of DTN. (2.) modification of messages or bundles in transit for malicious purposes. (3.) Unauthorized use of scarce DTN resources like replay attacks and (4.) denial of service which can be mounted on any network layer, and (5.) confidentiality and integrity threats like changing the destination in bundle. The author propose for DOS that firstly using random values instead of counters for identifying messages will make it hard to guess valid message content. Secondly, accepting only fresh authenticated messages and dropping all others will be advantageous in mitigating attacks. Thirdly, authors point that networks and security protocols themselves can create new DOS if not carefully designed. I am building on the second concept in my proposal i.e. exchange message after successful authentication. Moreover, Farrell and Cahill [11] propose that security architecture is needed in which security services can be provided both on hop-by-hop and end-to-end basis, and additionally between two intermediary nodes in the middle of a route. They also mention that several open issues remain in DTN security like the implementation cost and level of complexity should not rise too high, since typically complicated solutions are not secure in practice. Another big open issue is key management [11][12] briefly addresses security services on an end-to-end basis (e.g. confidentiality and DoS), but does not go into specifics nor considers the case of initial communication between two nodes without any prior security context. [13]The Delay Tolerant Networking Research Group (IRTF-DTNRG) has produced an Internet draft for bundle security protocol specification [12] and an additional draft [13] explaining the security overview and design choices made in the specification. The draft which is near completion describes security headers that can be added to bundles to provide different security services. Security Blocks in Bundle security Specification: According to RFC draft [13] there are four types of security block that can be included in a bundle. These are the (1.)Bundle Authentication Block (BAB), (2.) Payload Integrity Block (PIB), (3.) Payload Confidentiality Block (PCB) and (4.) Extension Security Block (ESB). The BAB is used to assure the authenticity and integrity of the bundle along a single hop from forwarder to intermediate receiver. The PIB is used to assure the authenticity and integrity of the payload from the PIB security-source, which creates the PIB, to the PIB security-destination, which verifies the PIB authenticator. The PCB indicates that the payload has been encrypted, in whole or in part, at the PCB security-source in order to protect the bundle content while in transit to the PCB security-destination. PIB and PCB protect the payload. The ESB provides security for non-payload blocks in a bundle. ESB therefore is not applied to PIB or PCBs, and of course is not appropriate for either the payload block or primary block. Extension Blocks Bundle Payload Primary Blocks (Time Stamp, Life Span, Flags, Source EID, Destination EID, Report to EID, Custodian EID) Security Blocks (optional) BAB, PIB, PCB, ESB Each security block contains source and destination information and a cipher-suite defines the algorithms that should be used to process the received security headers. The security-sender and the cipher-suite information together determine the choice of keys. Different combinations of these four security headers can be used simultaneously. The need to authenticate bundles using Security blocks is very useful to protect against denial-of service (DOS) attacks against a bundle agent’s resources, but need more insight knowledge how to implement it. In [14], [15] (Seth and Kate) authors discuss the challenges of providing secure communication (i.e., confidentiality) in DTN and suggest employing Identity-Based Encryption (IBE) to let a source derive the destination public key from some associated identity string, e.g., an e-mail address. In [14] Seth et al. discuss in detail about rural area DTN and shows that traditional mechanisms including a combination of Public Key Infrastructure (PKI) and certificates issued by trusted third party are not suitable for DTN. They develop a security mechanism for DTN using Hierarchical Identity-Based Cryptography (HIBC) for creating secure channels, providing mutual authentication, and key revocation. [15] Kate et al. uses identity based cryptography (IBC) for source authentication and anonymous communication as well as message confidentiality are provided using IBC. Its main idea is to make an entity’s public key directly derivable from its publicly known identity information such as e-mail address. Eliminating the need for public-key certificates and their management makes IBC much more appealing for securing DTNs, where the need to transmit and check certificates has been identified as a significant limitation. I note that the existing techniques to secure DTNs are aimed to provide data confidentiality and authentication only. In [16] Burgess et al. suggested that some Delay tolerant networks coupled with replication-based routing protocols are intrinsically fault tolerant even without authentication mechanisms. They compare four different routing algorithms (MaxProp and its three variants) against four different attack models: dropping of packets, flooding of packets, routing table falsification and counterfeiting delivery acknowledgments. They distinguish between two types of attack; weak and strong attacks on the basis of prior knowledge of DTN scenario. One of the major themes in the paper is the two-fold benefit of epidemic-style packet dissemination in DTN routing which improves packet delivery rates and greater attack tolerance. However, this paper does not provide any attack specific simulation. In [22] authors poses the question of the necessity of authentication or the level of authentication required especially since authentication imposes overhead. Without authentication, the number of nodes willing to join the network may actually increase due to the easier deployment, resulting in better overall performance. They identify conditions for an attack and present an attack based on a combination of targeted flooding and acknowledgement counterfeiting. They suggested that generally, attacks become increasingly effective when the minimum hop count required increases. Coclusion: Identity-based cryptography requires a global trusted third party to guarantee for new nodes entering the network (by generating the necessary private keys). But IBC is no better than traditional PKI in terms of authentication and only a little better than traditional PKI in terms of encryption since network connectivity is not necessarily needed at the time of reception and decryption. In [17] authors propose a scheme that gives confidentiality and authentication to messages leveraging social contact information and past present affiliation of peers. Author evaluates the proposed scheme by analysing real-world social network data of Facebook, simulating communication scenarios, and through an informal security analysis. In [18] authors focus on DOS and describe few possible DOS attacks for DTN and propose a token based mechanism against those attacks. Authors suggest attack depends on routing protocol. Therefore, it is obvious that the routing protocol that maintains routing table like in-node states can be subject to severe DOS attacks. Spray-and-wait protocol is a stateless protocol in that nodes do not maintain any routing states; instead a tiny state is kept in each packet header. Their first approach is very trivial but second approach based on Token utilising collision count with every peer node provides countermeasures against spoofing and packet dropping in a limited scenario. There are many drawbacks in this approach for example an honest node always meets the same malicious node spoofing   the same address and   that honest node never meets with the actual address holder or any other adversary spoofing that address. In this case the honest node does not suspect this peer to be an adver sary and always follows basic Spray and will transfer message to malicious node. In [19] A. Wood very broadly discusses about DOS attack taxonomy to identify the attacker, his capabilities, and the target of the attack, vulnerabilities used, and the end result. Although, author surveys vulnerabilities and give possible defences in Wireless sensor network some of which issues are useful in gaining insight of DOS attacks in DTN. According to author denial-of-service is the result of any action that prevents any part of a network from functioning correctly or in a timely manner. It is directly a breach to availability. In [2s0] authors also use Identity based cryptography to investigate how security in DTNs can be bootstrapped and present an improved scheme for authentication of fragments. We show that DTN with replicative routing protocols are not necessarily robust under known denial of service attacks if there are no authentication mechanism in place. Under many networking settings and mobility patterns, carefully designed attacks based on well-known techniques can cause considerable performance degradation. They investigate the attack effectiveness under various settings and identify properties of the networking environment that attribute to the vulnerability of the network. They observed that routing protocols which globally floods routing metadata to guide routing decisions are more susceptible to attacks as the routing metadata can be easily spoofed. They also observed that the minimum hop count required for packet delivery plays an important role. 3.3 Attack Model My objective is to determine how performance of a DTN network suffers when no authentication scheme is used. This also depends on other variables set aside in assumptions about the security model and what attacks I want to consider. By recognise that these little variations can cause DTN to perform badly even in the presence of few attackers, for example in case of extremely low mobility of nodes and one node positions itself at a crucial location along the routing path. If that node misbehaves, by dropping or flooding bundles, DTN will perform miserably at least along that routing path. I have chosen a hop by hop authentication model where main aim of adversary nodes is to create DOS by preventing the successful delivery of packets to their intended destinations. The adversary nodes can join together to launch a coordinated attack or a standalone adversary node can perform an opportunistic attack. 3.4 Authentication Without authentication no estimation can be formed about the identities of nodes and therefore the intentions of peers can be determined. In traditional TCP/IP, data frames are transmitted to all other nodes on a network. Each receiving node checks the destination address of each frame, and simply ignores any frame not addressed to its own MAC. Because it is a local broadcast domain, MAC address spoofing is fairly easy. Attackers can spoof address of any node and can become any node at any time including the destination node of the bundle. 3.5 Routing Model While routing is important consideration and routing data exchange between nodes is an important factor, the need for peer to peer and end to end authentication cannot be precluded. In my model I am ignoring any attacks based on routing data exchange and also at application layer such as spoofing requests that floods legitimate nodes to flood each other with unneeded traffic. 3.6 Mobility Model An attacker’s mobility can be variable. It can attack all nodes that come within its transmission range or it can choose to remain in the vicinity of one node in the network for extended periods. Tailgating is also possible. [6] Burgess et al call the latter approach a parasite attack the most effective use of the attacker’s resources. 3.7 Attack types In the above situation DOS attacks are possible by misbehaving nodes. I am considering the following two: Packet Dropping: An adversary node does not replicate, forward or store a packet that is received from its peer. These nodes act like black holes in the network and impair packet propagation in the network, although routing choices such as Spray provide some resilience to such attacks, because additional copies of packets might exist at other locations. Address Spoofing:   An adversary fakes the some other node’s address when it encounters another node in the network. An unsuspecting node sends packets to this malicious node and removes packets from its queue. The unsuspecting node might also delete the packet after delivery. If the malicious node receives packets with a high replication count, the successful delivery of such packets becomes highly unlikely.   Spoofing created more problems in the network than dropping with respect to packet delivery. An attacker can also perform both types of attacks simultaneously. 3.8 Assumptions In this section I describe assumptions for my proposed resilience mechanism to prevent DOS attacks in DTN. I’m considering two schemes; one based on pre shared symmetric keys and other based on public key cryptography. There is a Trusted Authority is assumed not to be compromised and nodes can only be registered by proving their credentials. Registration Authority can be any service providing company or any local company or government organisation.   Also malicious nodes cannot be registered and registered nodes are not malicious. Each node has a unique ID and I assume that all group nodes have enough power and storage capability to perform cryptographic operations. For pre pre-shared keys scheme, each node at registration phase is given a group key, which it uses for authenticating other nodes. For public key cryptography based scheme, each node is given a public- private key pair at registration phase. Also, each node maintains a table of every other node in the group and their public keys. This table is provided at registration phase. 3.9 Proposed Resilience Mechanism My proposed schemes are based on creating a mutually trusting network of nodes. Spoofing nodes cannot utilise this network because they cannot pass authentication checks. a)   Scheme based on pre-shared group key: The communicating nodes thwart potential DOS attacks of packet flooding by malicious sender and packet dropping by malicious receiver. Nodes authenticate each other before sending packets. The intention is to find if a peer is spoofing someone’s address. This is done as follows. Two nodes N1 and N2 are part of the group, which shares the group key G that they received at registration phase and wants to authenticate each other. Node N1 generates a random token RN1 and encrypts is with the group key G and sends the encrypted message G[RN1] to N2 Node N2 decrypts G[RN1] with G and sends result G’[G[RN1]] to N2 Node N1 checks whether RN1 is equal to G’[G[RN1]], if mismatch, N1 terminates further communication, otherwise proceed to next steps Node N2 generates a random token RN2 and encrypts is with the group key G and sends the encrypted message G[RN2] to N1 Node N1 decrypts G[RN2] with G and sends result G’[G[RN2]] to N2 Node N2 checks whether RN2 is equal to G’[G[RN2]], if mismatch, N2 terminates further communication, otherwise proceed to next steps N1 and N2 exchanges message. The drawback of this scheme is if pre-shared group key is compromised a malicious node can spoof any other node and coordinated attacks can be very disastrous. b)  Ã‚  Scheme based on public key cryptography: In this scheme each trusted node maintains a table of other nodes and their public keys. This list is originally provided by Trusted Authority and refreshed when subject node comes in contact with Trusted Authority opportunistically or at scheduled times. The communicating nodes authenticate each other based on each other’s public keys before sending packets. This is done as follows. Two nodes N1 and N2 are part of the group, with each having their public private key pair [NiPub, NiPvt] received at registration phase. N1 generates a random Token RN1 N1 creates encrypted Token N2pub[RN1] Using shared N2s public key and sends to N2 N2 decrypts N2pub[RN1] using its private key and responds with N2pvt[N2pub[RN1]] N1 checks whether N2pvt[N2pub[RN1]] is equal to RN1. If mismatch, N1 terminates further communication, otherwise proceed to next steps N2 generates a random Token RN2 N2 creates encrypted Token N1pub[RN2] Using shared N1s public key and sends to N1 N1 decrypts N1pub[RN2] using its private key and responds with N1pvt[N1pub[RN2]] N2 checks whether N1pvt[N1pub[RN2]] is equal to RN2. If mismatch, N2 terminates further communication, otherwise proceed to next steps N1 and N2 exchanges message. In both of these schemes one node needs to know if the bundle originates from a trusted community in order to prevent flooding attack by a malicious node and the bundle is sent to a trustworthy node in order to prevent packed dropping If a malicious node spoofs some other node’s address, it cannot decrypt the encrypted random token it received from its peer. Analysis of Proposed Mechanism: I have chosen the above mutual authentication schemes as a mechanism to prevent DOS attacks on DTN because this is a reliable way to identify malicious nodes and prevent packet flooding by rejecting packets from untrusted nodes and also prevent the risk of packet dropping by not sending packets to untrusted nodes. If a malicious node tries to send junk packets to legitimate nodes, the packets can be discarded at first contact with a legitimate node because a malicious node cannot authenticate itself to the network without pre-shared group key or public-private keys issued by Trusted Authority. There is a need to address current distribution of security information among nodes. This will involve key management and revocation issues. But this is part of more general DTN configuration management solution. 3.10 Simulation model and parameters Result Matrices: The simulation results will show that packet delivery rate decreases significantly in the presence of malicious nodes, i.e., packet droppers and/or address spoofers. The results will also show that delivery rate is increased with our countermeasures. In addition to that, I will also measure the overheads caused by the countermeasures in terms of number of copies of a single packet. One Simulator (used for simulation) The Opportunistic Networking Environment (ONE) simulator has been specially designed for evaluating DTN routing and application protocols. It is written in JAVA. It provides Generation of node movement using different movement models e.g. 1. Random Movement 2. Map based Random Movement 3. Human behaviour Based Movement Routing messages between nodes with various DTN routing algorithms and sender and receiver types. Visualizing both mobility and message passing in real time in its graphical user interface. I have run some scenarios and already Implement protocols in ONE like 1.) MaxProp   2.)Direct Delivery, 3.)   Epidemic, 4.) First Contact, 5.) PROPHET 6.) Spray and Wait I have tried to read and understand Code of different classes, I have configured ONE using Eclipse Work done Fig: Screen shot of scenario One simulator test runs Five test runs were done on One Simulator using default epidemic routing with varying number of nodes from 60 to 180 in steps of 30. Some of the results are captured in the table below Nodes 60 90 120 150 180 sim_time 165 374 541 780 1096 delivered 288 292 313 300 299 delivery_prob 0.3876 0.3914 0.4196 0.4032 0.4024 hopcount_avg 20.7396 15.2705 17.7636 15.12 12.9398 Future work I have chosen mutual authentication as a means to prevent DOS attacks because current implementation of DTN does not yet completely address the problem of address spoofing and packet dropping. Without the aid of some form of authentication either at node level or bundle level, it is difficult to discern malicious nodes. The bundle security protocol draft introduces four new security blocks in Bundle architecture (BAB, PIB) and their purposes. These blocks can be used to implement existing cryptographic techniques to provide some robust resilience against DOS and other common attacks in DTN. However this will involve development of reliable cipher suites and cryptosystems and this is an area of continued research. My further work will be mainly focused in the area of Bundle security specification. CHAPTER 4: Conclusion 4.1 Project Work Plan 5: References [1]  Ã‚   K. Fall, â€Å"A Delay-Tolerant Network Architecture for Challenged Internets,† SIGCOMM, August 2003. [2]  Ã‚   Vinton Cerf, Scott Burleigh, Adrian Hooke, Leigh Torgerson, Robert Durst, Keith Scott, Kevin Fall, and Howard Weis, Delay-tolerant network architecture. DTNRG Internet Draft, March 2003 and   IETF RFC 4838, informational, April 2007. [3]  Ã‚   K. Scott and S. Burleigh, â€Å"Bundle Protocol Specification,† IETF RFC5050, experimental, November 2007. [4]  Ã‚   K. Fall and S. Farrell, â€Å"DTN: an architectural retrospective,† Journal of Selected Areas in Communications, vol. 26 no. 5, pp. 828- 836, June 2008. [5]  Ã‚   William D. Ivancic (NASA Glenn Research Center), â€Å"Security Analysis of DTN Architecture and Bundle Protocol Specification for Space-Based Networks†, IEEEAC paper1057, Version 4, Updated 2009:10:27 [6]  Ã‚   DTN The State of the Art (http://wiki.n4c.eu/wiki/images/0/03/Proposal_description.pdf) [7] Challenged Internet Access Network Technology Infrastructure (CHIANTI March 2008) [7]  Ã‚   http://en.wikipedia.org/wiki/Delay-tolerant_networking [8]  Ã‚   L. Wood, W. Eddy, P. Holiday: â€Å"A Bundle of Problems,† IEEE Aerospace conference, Big Sky, Montana, March 2009. [9]  Ã‚   K. Scott and S. Burleigh, â€Å"Bundle Protocol Specification,† IETF RFC5050, experimental, November 2007. [10]  Ã‚  Ã‚   F. Warthman. Delay tolerant networks tutorial..tnrg.org/docs/tutorials/warthman-1.1.pdf, 2003. [11]  Ã‚  Ã‚   Stephen Farrell and Vinny Cahill. Security considerations in space and delay tolerant networks. In Proc. 2nd IEEE International Conference on Space Mission Challenges for Information Technology (SMC-IT’06), July 2006. [12]  Ã‚  Ã‚   Stephen Farrell, Susan Symington, and Howard Weiss. Delay-Tolerant networking security overview.IRTF, DTN research group, October 2006. Draft version -03; expires in Expires: January 4, 2008. [13]  Ã‚  Ã‚   S. Symington, S. Farrell, H. Weiss. Bundle Security Protocol Specification. dtnrg.org/draft-irtf-dtnrg-bundlesecurity-19.txt, Expires: September 12, 2011. [14]  Ã‚  Ã‚   A Seth, U. Hengartner, and S. Keshav. Practical security for disconnected nodes. In First Workshop on Secure Network Protocols (NPSec), Revised 2006 version of the NPSec paper cs.uwaterloo.ca/a3seth/practical security v2.pdf. [15]  Ã‚  Ã‚   A. Kate, G. Zaverucha, and U. Hengartner. Anonymity and security in delay tolerant networks. In Secure Comm 2007. [16]  Ã‚  Ã‚   J. Burgess, G. D. Bissias, M. Corner, and B. N. Levine. Surviving attacks on disruption-tolerant networks without authentication. In MobiHoc ’07, pages 61–70, New York, NY, USA, 2007. ACM. [17]  Ã‚  Ã‚   K. El Defrawy, J. Solis, G. Tsudik. Leveraging Social Contacts for Message Confidentiality in Delay-Tolerant Networks 33rd Annual IEEE International Computer Software and Applications Conference, Seattle, Washington, July 20-24, 2009 [18]  Ã‚  Ã‚   Technical Report on ‘Denials in DTN’ by www.ideals.illinois.edu/bitstream/handle/2142/14821/denialindtns.pdf? [19]  Ã‚  Ã‚   Wood A. D. and Stankovic J. A. A taxonomy for denial-of service attacks in wireless sensor networks, in Handbook of Sensor Networks: Compact Wireless and Wired Sensing Systems, edited by Mohammad Ilyas and Imad Mahgoub, CRC Press LLC, 2005. [20]  Ã‚  Ã‚   N. Asokan, K. Kostianinen, P. Ginzboorg, J. Ott, and C. Luo, â€Å"Towards securing disruption-tolerant networking,† Nokia Research Center, Tech. Rep. NRC-TR-2007-007. [21]  Ã‚  Ã‚   Virgil D. Gligor. On denial-of-service in computer networks. In Proceedings of the International Conference on Data Engineering, pages 608.617. IEEE, 1986.) [22]  Ã‚  Ã‚     Fai Cheong Choo, Mun Choon Chan and Ee-Chien Chang â€Å"Robustness of DTN against Routing Attacks,† COMSNET, Bangalore, Jan 4-9, 2010. [23]  Ã‚  Ã‚   Ari Keranen, Jog Ott, and Teemu Karkkainen. The ONE Simulator for DTN Protocol Evaluation. In SIMUTools 09: Proceedings of the 2nd Inter-national Conference on Simulation Tools and Techniques, New York, NY, USA, 2009. ICST. [24]  Ã‚  Ã‚   One simulator tool website. netlab.tkk.fi/tutkimus/dtn/theone/.

First Anglo-Afghan War, 1839-1842

First Anglo-Afghan War, 1839-1842 During the nineteenth century, two large European empires vied for dominance in Central Asia. In what was called the Great Game, the Russian Empire moved south while the British Empire moved north from its so-called crown jewel, colonial India. Their interests collided in Afghanistan, resulting in the First Anglo-Afghan War of 1839 to 1842. Background to the First Anglo-Afghan War In the years leading up to this conflict, both the British and Russians approached Afghanistans Emir Dost Mohammad Khan, hoping to form an alliance with him. Britains Governor-General of India, George Eden (Lord Auckland), grew extremely concerned with he heard that a Russian envoy had arrived in Kabul in 1838; his agitation increased when talks broke down between the Afghan ruler and the Russians, signaling the possibility of a Russian invasion. Lord Auckland decided to strike first in order to forestall a Russian attack. He justified this approach in a document known as the Simla Manifesto of October 1839. The manifesto states that in order to secure a trustworthy ally to the west of British India, British troops would enter Afghanistan to support Shah Shuja in his attempts to retake the throne from Dost Mohammad. The British werent invading Afghanistan, according to Auckland- just helping out a deposed friend and preventing foreign interference (from Russia). The British Invade Afghanistan In December of 1838, a British East India Company force of 21,000 mainly Indian troops began to march northwest from Punjab. They crossed the mountains in the dead of winter, arriving at Quetta, Afghanistan in March of 1839. The British easily captured Quetta and Qandahar and then routed Dost Mohammads army in July. The emir fled to Bukhara via Bamyan, and the British reinstalled Shah Shuja on the throne thirty years after he had lost it to Dost Mohammad. Well satisfied with this easy victory, the British withdrew, leaving 6,000 troops to prop up Shujas regime. Dost Mohammad, however, was not ready to give up so easily, and in 1840 he mounted a counter-attack from Bukhara, in what is now Uzbekistan. The British had to rush reinforcements back into Afghanistan; they managed to capture Dost Mohammad and brought him to India as a prisoner. Dost Mohammads son, Mohammad Akbar, began to rally Afghan fighters to his side in the summer and autumn of 1841 from his base in Bamyan. Afghan discontent with the continued presence of foreign troops mounted, leading to the assassination of Captain Alexander Burnes and his aides in Kabul on November 2, 1841; the British did not retaliate against the mob that killed Captain Burnes, encouraging further anti-British action. Meanwhile, in an effort to soothe his angry subjects, Shah Shuja made the fateful decision that he no longer needed British support. General William Elphinstone and the 16,500 British and Indian troops on Afghan soil agreed to begin their withdrawal from Kabul on January 1, 1842. As they made their way through the winter-bound mountains toward Jalalabad, on January 5th a contingent of Ghilzai (Pashtun) warriors attacked the ill-prepared British lines. The British East India troops were strung out along the mountain path, struggling through two feet of snow. In the melee that followed, the Afghans killed almost all of the British and Indian soldiers and camp followers. A small handful was taken, prisoner. The British doctor William Brydon famously managed to ride his injured horse through the mountains and report the disaster to British authorities in Jalalabad. He and eight captured prisoners were the only ethnic British survivors out of about 700 who set out from Kabul. Just a few months after the massacre of Elphinstones army by Mohammad Akbars forces, the new leaders agents assassinated the unpopular and now defenseless Shah Shuja. Furious about the massacre of their Kabul garrison, the British East India Company troops in Peshawar and Qandahar marched on Kabul, rescuing several British prisoners and burning down the Great Bazaar in retaliation. This further enraged the Afghans, who set aside ethnolinguistic differences and united to drive the British out of their capital city. Lord Auckland, whose brain-child the original invasion had been, next concocted a plan to storm Kabul with a much larger force and establish permanent British rule there. However, he had a stroke in 1842 and was replaced as Governor-General of India by Edward Law, Lord Ellenborough, who had a mandate to restore peace to Asia. Lord Ellenborough released Dost Mohammad from prison in Calcutta without fanfare, and the Afghan emir retook his throne in Kabul. Consequences of the First Anglo-Afghan War Following this great victory over the British, Afghanistan maintained its independence and continued to play the two European powers off of each other for three more decades. In the meantime, the Russians conquered much of Central Asia up to the Afghan border, seizing what is now Kazakhstan, Uzbekistan, Kyrgyzstan, and Tajikistan. The people of what is now Turkmenistan were the last vanquished by the Russians, at the Battle of Geoktepe in 1881. Alarmed by the tsars expansionism, Britain kept a wary eye on Indias northern borders. In 1878, they would invade Afghanistan once again, sparking the Second Anglo-Afghan War. As for the people of Afghanistan, the first war with the British reconfirmed their distrust of foreign powers and their intense dislike of foreign troops on Afghan soil. British army chaplain Reverand G.R. Gleig wrote in 1843 that the First Anglo-Afghan War was begun for no wise purpose, carried on with a strange mixture of rashness and timidity, [and] brought to a close after suffering and disaster, without much glory attached either to the government which directed, or the great body of troops which waged it. It seems safe to assume that Dost Mohammad, Mohammad Akbar, and the majority of Afghan people were much better pleased by the outcome.

STrategic plan Assignment Example | Topics and Well Written Essays - 3000 words

STrategic plan - Assignment Example It has background in events sponsorship through the MINI Challenge. However, so far, MINI Australia has not yet had exposure to the gym and fitness industry. This report explores the possibility for the creation of the MINI chain of gyms throughout Australia, and analyses the potential success of this project for the purpose of securing the participation of other investors in this long-term undertaking. Analysis of external environment Prior to considering the company’s internal capabilities, it is necessary to look at the Australian automotive industry as a whole. The automotive industry is comprised of two sectors, namely the automotive manufacturing sector and the automotive retail, services and repair sector. The automotive manufacturing sector is dominated by three large vehicle manufacturers (i.e. General Motors, Ford and Toyota), as well as three large truck manufacturers (i.e., IVECO, Kenworth, and Volvo Commercial Vehicles). The automotive manufacturing sector produce s for both the domestic market as well as for the export market; in 2008, production totalled 324,684, or which just slightly over 50% (162,728) vehicles were sold locally, and the remaining 161,956 were exported. In that year, automotive industry exports rose by 14%, with the largest target export market being the Middle East, accounting for 38.1% of export sales. (MSA, 2009). PESTLE Analysis Political Australia is a mature democracy supported by a stable economy. While it has a stable party system, the ruling parties have not historically enjoyed clear majorities in the Senate (Parliament’s upper house). This disadvantage may cause some barriers or introduce delays in having important bills passed. Furthermore, in the recent 2010 election yielded inconclusive results that ushered in once more a coalition government, casting widespread doubts on the ability of this administration to remain in power for the full extent of its three year term (BMI, 2011) Economic Australia enj oys a modern and stable economy backed by a sound financial system and a workforce with a high level of education. There is continuity in policy making, which reduces investors’ risks as well as the vulnerability of the economy to regime change in the government. A measure of economic weakness is introduced, however, by the relatively high current account deficit. This increases the economy’s vulnerability to capital flows and tends to induce greater fluctuations in the currency exchange rate. This in turn causes fluctuations in the prices of commodities and increased apprehensions among the buying public. (BMI, 2011). There are likewise opportunities presented by the country’s economy, as a result of the rapid, region-wide expansion of Asian economies. The region has proven itself resilient to the recent economic recession triggered by the U.S. subprime crisis, and its strong position has created new impetus for diversification of trading ties from the core EU markets. Furthermore, Australia has a relatively lower level of government debt than most developing and developed countries, allowing it greater flexibility in the determination of fiscal policy, in order to provide support for local consumers and business until the global economy recovers from the recent downturn

Renewal of the USA Patriot Act Essay Example | Topics and Well Written Essays - 500 words

Renewal of the USA Patriot Act - Essay Example The USA Patriot Act provided law enforcement and intelligence agencies with basic tools needed to fight and win the war against terrorism. It provided new authority to the Justice Department and the FBI to monitor alleged terrorists or their associates, and provided legal sanction for increased information-sharing between criminal investigators and intelligence agencies. It has expanded the government’s surveillance and prosecutorial powers against suspected terrorists, their associates and financiers. The act allows the government to obtain warrants to monitor and search suspects without meeting previous standards of probable cause, in any criminal investigation, whether related to terrorism or not. As a result, some searches that would have been unreasonable before September 11 are now legal and some significant information will be shared by various law enforcement agencies that otherwise would not have been shared.

Research Proposal Essay Example | Topics and Well Written Essays - 2500 words - 7

Research Proposal - Essay Example Two middle managers, a labour union leader and thirteen low-level permanent employees were selected using two-stage random sampling technique. Two standardize and validated instruments (questionnaires and interview guides) were used to generate background information and data for analysis. The result of the survey indicates 68.5% believe informal mechanism is more effective in improving individual performance while 54.3% believe it is most appropriate for teamwork. In contrast, 51% low-level employees believe formal mechanisms improve individual performance while 30.1% believe it improves teamwork. Both middle managers and low-level employees believe that a combination of informal and formal control mechanisms is most effective in enhancing employee performance and productivity. However, 79.5% of the middle managers believe a combination that emphasizes formal mechanism is more effective. This is in contrast to low-level employees’ perception (93.4%) that a combination of info rmal and formal strategies that gives prominence to informal interactions among employees is more effective in enhancing employee performance. This contradictory perception of the combination of mechanisms suggests the need for further research into the relations between different combinations of mechanisms and employee performance at individual and team levels. The environment organizations operate is fast changing politically, economically, socially and technologically. These changes are impacting on the way organizations are designed to accommodate resultant changes in relationships among employees. It is the responsibility of management of organizations to continuously respond to these changes in environment and relationship among employees. Traditional rigid methods of dealing with employee relations vis-Ã  -vis performance and productivity are giving way for newer flexible methods. The

Nonprofit organizations Essay Example | Topics and Well Written Essays - 500 words

Nonprofit organizations - Essay Example A non-profit organization or entity should be structured or formal in some way in that they can easily be differentiated from mere extemporized groups or informal family groups (Salamon, 1992). In essence, this provision means the organization in question should have some governing rules and or procedures, an instrument of organization, as well as regularly chosen officers that carry out organized procedures or activities. In addition, these institutions have a legal identification and enter into contracts legally without obligating the personal financial accountability of its personnel. This provides that non-profit organizations be separate institutionally from the government, i.e., neither its board is dominated by members of the government nor is it by any means part of the government. In the US, Salamon (1992) asserts that non-profit organizations make part of the private sector and are administrated by private boards of directors. Despite them being structurally and organizationally separate from the government, Salamon (1996) argues that non-profit organizations are often under great governmental influence. An example is where organizations are bound by state regulations regarding sexual harassment, environmental protection, equal opportunity, handicapped accessibility, and protection of human subjects. This has led to some pundits positing that the involvement of the government is a mere intrusion and undermining of the typical nonprofit sector (Rathgeb and Lipsky, 1993). A non-profit organization operates with no intention of making profit for the owners. All profits generated are invested back into the organization’s mission thus forming a distinct difference between it and private business. In essence, Murray (2004) points out that non-profit distributing organizations means that non-profit organizations do not, and are not allowed to generate profits from reduced expenditures and increased receipts. This means that these organizations are

Academic carrier goal Essay Example | Topics and Well Written Essays - 250 words

Academic carrier goal - Essay Example My papers were appreciated a lot both in home and school. Teachers approved of my critical analysis and encouraged me to practice the act quite frequently. They visualized a potential producer and director in me because of which, throughout my high school, I was named â€Å"2 in 1†. Gradually, the inspiration I gained from my mentors became ingrained in my thinking, and I wanted to build my career in film making. This field is perfect for me because it accords with my aptitude. I was recently studying the program of film making at an art school, which considerably lacked the technology that is essential for the demonstration of skill. Therefore, I have decided to transfer my credit hrs to another school, the Chapman University in LA. From the prospectus, I have come to know that Dodge College is well equipped with latest technology pertaining to film direction and production. Sound capturing is an important element if film making, and can both make and break the quality of a f ilm. In order to be a good producer and director, it is compulsory to be educated on the use of equipment. Dodge College equips digital audio recorder, boom microphone, digital editing software and such other tools that I can practice on and learn the art of film making. Therefore, I want to pursue my studies in this college.

Subject is American Government. Topic is Socialization Essay

Subject is American Government. Topic is Socialization - Essay Example The strength of the political culture of a country depends on the extent at which these agents of socialization can help to teach the people about certain societal rules, values and expectations (Anderson & Taylor, 2007). Generally, the masses tend to follow the agent of socialization that inspires them politically (Brinkerhoff, White & Ortega, 2007). The mass media for example helps to disseminate information about the things that go on in the political mainstream of the country and it is what they give to the people that the people take. Thus, agents of socialization play a great role in shaping an individual’s political culture. The agent of socialization that has had the greatest influence in shaping my views about the government is the family. The reason is not far-fetched. They say charity begins at home and my perception about the government actually begins with the opinion of my immediate family. This is due to the fact that, my family is the closest agent of socialization to me and I hear their views and opinion about the government through our dinner talks and general discussions at home. Thus, any opinion that I have formed about the government could easily be traced to the discussions and debates I have had with my family. My parents have had a major influence in my perception of the government and this shows the extent at which, the family as an agent of socialization has had the greatest influence in shaping my perception about

Academic carrier goal Essay Example | Topics and Well Written Essays - 250 words

Academic carrier goal - Essay Example My papers were appreciated a lot both in home and school. Teachers approved of my critical analysis and encouraged me to practice the act quite frequently. They visualized a potential producer and director in me because of which, throughout my high school, I was named â€Å"2 in 1†. Gradually, the inspiration I gained from my mentors became ingrained in my thinking, and I wanted to build my career in film making. This field is perfect for me because it accords with my aptitude. I was recently studying the program of film making at an art school, which considerably lacked the technology that is essential for the demonstration of skill. Therefore, I have decided to transfer my credit hrs to another school, the Chapman University in LA. From the prospectus, I have come to know that Dodge College is well equipped with latest technology pertaining to film direction and production. Sound capturing is an important element if film making, and can both make and break the quality of a f ilm. In order to be a good producer and director, it is compulsory to be educated on the use of equipment. Dodge College equips digital audio recorder, boom microphone, digital editing software and such other tools that I can practice on and learn the art of film making. Therefore, I want to pursue my studies in this college.

Delivering Business Value with It at Hefty Hardware Essay Example for Free

Delivering Business Value with It at Hefty Hardware Essay IT Value is defined as the worth or desirability of a thing. It is a subjective assessment. The value of IT depends very much on how a business and its individual managers choose to view it. Strategic positioning, increased productivity, improved decision making, cost savings, or improved service are all ways value could be defined. It is tied to the organization’s business model because adding value with IT should enable a firm to do it business better. One company sees value resulting from all parts of the organization having the same processes; another defines value by return on investment (ROI); still another measures t by a composite of key performance indicators. IT value proposition is that everyone involved in an IT initiative agree on what value they are trying to deliver and how they will recognized it. IT Value is a function of people, process, and technology. The Three Components of the IT Value Proposition: Identification- Recognize and evaluate opportunities. Conversion- Transformation of ideas and opportunities into IT value propositions and creating IT value. Realization- Deliver value and ensure that technology is widely accepted Best Practices in Identifying Potential Value: Joint business-IT structure. Compare value across projects. Utilize a portfolio approach to project selection/prioritization. Establish a funding mechanism for infrastructure. Conversion: Managerial issues with Conversion More projects than resources: Insufficient time to complete all projects; inadequate technical/business resources; significant business process redesign may be required for implementation of IT. IT value creation can be successfully made by: Excellent project management; Effective execution (e.g. change management); Reliable IT operations Best Practices in Realizing Value: Measure outcomes against expected results.[Does Expected Value = Actual Value?]; Plan a value-realization phase for all IT projects; Look for and eliminate root causes of problems; Assess value realization at all levels in the organization; Have provision for acting on new opportunities.