Comparing P2PTV Traffic Classifiers

Peer-to-Peer IP Television (P2PTV) applications represent one of the fastest growing application classes on the Internet, both in terms of their popularity and in terms of the amount of traffic they generate. While network operators require monitoring tools that can effectively analyze the traffic produced by these systems, few techniques have been tested on these mostly closed-source, proprietary applications. In this paper we examine the properties of three traffic classifiers applied to the problem of identifying P2PTV traffic. We report on extensive experiments conducted on traffic traces with reliable ground truth information, highlighting the benefits and shortcomings of each approach. The results show that not only their performance in terms of accuracy can vary significantly, but also that their usability features suggest different effective aspects that can be integrate

An Experimental Evaluation of the Computational Cost of a DPI Traffic Classifier

A common belief in the scientific community is that traffic classifiers based on deep packet inspection (DPI) are far more expensive in terms of computational complexity compared to statistical classifiers. In this paper we counter this notion by defining accurate models for a deep packet inspection classifier and a statistical one based on support vector machines, and by evaluating their actual processing costs through experimental analysis. The results suggest that, contrary to the common belief, a DPI classifier and an SVM-based one can have comparable computational costs. Although much work is left to prove that our results apply in more general cases, this preliminary analysis is a first indication of how DPI classifiers might not be as computationally complex, compared to other approaches, as we previously though

Sobre inestabilidad e integración de tensiones de formulaciones viscoplásticas para hormigón

Se analizan las consecuencias de los postulados de estabilidad en formulaciones elastoplásticas y elasto-viscoplásticas para materiales cohesivo-friccionales. En particular se considera el criterio de inestabilidad en lo pequeño propuesto por Hi116 para sistemas disipativos y sus características espectrales se analizan por medio del Módulo de Rigidez Direccional. Para los fines comparativos de la predicción de inestabilidad en materiales elastoplásticos y viscoplásticos se considera el camino de tensiones seguido en el Ensayo Experimental de Inestabilidad de Smith12. Los resultados muestran la influencia del grado de no asociatividad y del nivel de viscocidad material en la predicción de inestabilidad local.In this work, the consequenses of the stability conditions in elasto-plastic and elastoviscoplastic constitutive formulations for concrete materials are analyzed. In particular, the criterion for local instability by Hi116 is considered and its performance is analyzed by means of the directional stiffness modulus. The numerical results for the stress path of the instability test by Smith12 illustrate the influence of the grade of nonassociativity and of the viscosity in the performance of the instability condition.Peer Reviewe

Irus and his jovial crew : representations of beggars in Vincent Bourne and other eighteenth-century writers of Latin verse

Alastair Fowler has written, with reference to the time of Milton, of ‘Latin's special role in a bilingual culture’, and this was still true in the early eighteenth century. The education of the elite placed great emphasis on the art of writing Latin verse and modern, as well as ancient, writers of Latin continued to be widely read. Collections of Latin verse, by individual writers such as Vincent Bourne (c. 1694–1747) or by groups such as Westminster schoolboys or bachelors of Christ Church, Oxford, could run into multiple editions, and included poems on a wide range of contemporary topics, as well as reworkings of classical themes. This paper examines a number of eighteenth-century Latin poems dealing with beggars, several of which are here translated for the first time. Particular attention is paid to the way in which the Latin poems recycled well-worn tropes about beggary which were often at variance with the experience of real-life beggars, and to how the specificities of Latin verse might heighten negative representations of beggars in a genre which, as a manifestation of elite culture, appealed to the very class which was politically and legally responsible for controlling them

Breaking the shackles: the continuing fight against censorship and spin 2008

This is the 2008 edition of the Alliance\u27s annual report into the state of press freedom in Australia, and reports some promising developments over the past twelve months

L'ús del RNA d'interferència com a eina terapèutica

Els descobriments que s'han fet en el camp del RNA d'interferència en els últims anys han revolucionat els coneixements de la biologia molecular i cel·lular i han permès avançar també en les teràpies per tractar malalties greus, com ara el VIH. Però el següent article demostra que encara queda molt per investigar sobre les limitacions que hi ha per convertir molècules de RNA en possibles fàrmacs d'ús terapèutic.Los descubrimientos que se han hecho en el campo del RNA de interferencia en los últimos años han revolucionado los conocimientos de la biología molecular y celular y han permitido también avanzar en las terapias para tratar enfermedades graves, como el VIH. Pero el siguiente artículo demuestra que, hoy por hoy, aún queda mucho por investigar sobre las limitaciones que existen para convertir moléculas de RNA en posibles fármacos de uso terapéutico.The latest discoveries in the field of RNA interference have revolutionized our knowledge of molecular and cellular biology. They have allowed to advance in therapies to treat serious diseases, like HIV. But this article proves that, at the present time, much is left to investigate on the limitations of using RNA molecules as a therapeutic tool

Succession planning for leadership transformation for South African non-profit organisations

Non-profit organisations (NPOs) play a vital role in South African society, providing critical services for many underserved and marginalised communities. Despite the evidence of the importance of NPOs in transforming the South African economy and society, there is very little research on succession planning for executive leadership transformation within this sector. The Literature on this topic is primarily based on case studies from other countries. South African studies were conducted in the public or private sector, which does not address the unique context of NPOs. This dissertation aims to address the gap in the current academic literature by exploring the unique ways in which NPOs implement succession planning to achieve successful internal executive leadership transformation within the South African non-profit sector. The primary research question is, “How do NPOs plan organisational succession to achieve successful internal executive leadership transformation?” The study used Eisenhardt's method of building theories from case study research as the overarching research methodology. Data was collected from eight NPOs. Semi-structured interviews were conducted with the ex-Executive Director (ED) and the incumbent ED of each NPO. Both in-case and cross-case analyses were used to derive the findings. Key findings from the research include the importance of being intentional about creating diverse and inclusive organisations, having reciprocal trust between the Executive Director and the board, and creating informal learning opportunities for potential successors. Future research should focus on the first 12 - 24 months of the incumbent ED, exploring the main challenges faced by the new leader as a black perso