Decentralized Adaptive Helper Selection in Multi-channel P2P Streaming Systems

In Peer-to-Peer (P2P) multichannel live streaming, helper peers with surplus bandwidth resources act as micro-servers to compensate the server deficiencies in balancing the resources between different channel overlays. With deployment of helper level between server and peers, optimizing the user/helper topology becomes a challenging task since applying well-known reciprocity-based choking algorithms is impossible due to the one-directional nature of video streaming from helpers to users. Because of selfish behavior of peers and lack of central authority among them, selection of helpers requires coordination. In this paper, we design a distributed online helper selection mechanism which is adaptable to supply and demand pattern of various video channels. Our solution for strategic peers' exploitation from the shared resources of helpers is to guarantee the convergence to correlated equilibria (CE) among the helper selection strategies. Online convergence to the set of CE is achieved through the regret-tracking algorithm which tracks the equilibrium in the presence of stochastic dynamics of helpers' bandwidth. The resulting CE can help us select proper cooperation policies. Simulation results demonstrate that our algorithm achieves good convergence, load distribution on helpers and sustainable streaming rates for peers

YouTube or You Lose: Grand Challenges Canada Explores Whether Scientists Are Ready for Web-Based Grant Competitions

It is not hard to trace the influence of technology on the way we read the literature or give scientific presentations. Not so long ago, chemists used hard copies of Chemical Abstracts to find papers and sticks of chalk to deliver talks. Only over the past decade have computer presentations become the norm. In contrast, the way that grants are evaluated has remained relatively unchanged: scientists submit written proposals that are then evaluated by committees of scientists in the field. Might this process soon change as well? The not-for-profit organization Grand Challenges Canada (GCC) recently sponsored a competition in which researchers presented audacious ideas to attack problems related to global health (Figure 1). In its search for bold ideas from scientists, the GCC organization tested a bold idea as well: each proposal had to be accompanied by a 2-min-long video for public consumption on the Internet. Web users were encouraged not only to view these video summaries but to participate in the evaluation of the proposals by means of clicking on a “thumbs up” button (similar to the “like” buttons found on YouTube and Facebook). The votes from the public video were used by GCC to evaluate each applicant’s ability to “engage the public and increase awareness in the grand challenges facing global health today”.^1 The competition collected over 180,000 votes and over 100,000 unique online visits from 156 countries in a mere 4 weeks—staggering statistics for scientific videos. While each applicant also submitted a written version of the proposal, which was privately evaluated by “standard” peer-review, the public video feature was one of the first direct implementations of Web 2.0 technology (user-interactive sites and applications) to evaluate scientific proposals. The competition raises an important question: to what extent, if any, should Web 2.0 technology or other direct evaluation by the public be used to determine the outcome of scientific grant proposals

A Video Timeline with Bookmarks and Prefetch State for Faster Video Browsing

International audienceReducing seek latency by predicting what the users will access is important for user experience, particularly during video browsing, where users seek frequently to skim through a video. Much existing research strived to predict user access pattern more accurately to improve the prefetching hit rate. This paper proposed a different approach whereby the prefetch hit rate is improved by biasing the users to seek to prefetched content with higher probability, through changing the video player user interface. Through a user study, we demonstrated that our player interface can lead to up to 4$\times$ more seeks to bookmarked segments and reduce seek latency by 40\%, compared to a video player interface commonly used today. The user study also showed that the user experience and the understanding of the video content when browsing is not compromised by the changes in seek behavior.

Catching the Viewer\u27s Eye: Examining Exploration and Exploitation Strategies in the Live Streaming Market

Live streaming has become an important feature on social media platforms like Facebook and Instagram. More and more entrepreneurs (content creators) are competing in live streaming platforms like Twitch to maximize the attention they receive from consumers (viewers). In this competitive landscape, it is crucial for entrepreneurs to develop and provide new compelling content that can maximize the consumers’ attention and aid the discovery of their content. We adopt an exploration-exploitation framework and assess the four strategies these new entrepreneurs could use to attract viewership and position themselves on Twitch: exploration, exploitation, learning from viewers, and their neighbor streamers. We combined the natural language processing techniques with theory-driven measures to accomplish this. Using our proposed measures, we estimate the utility of consumers from these different strategies using the discrete choice demand model

CHORUS Deliverable 2.1: State of the Art on Multimedia Search Engines

Based on the information provided by European projects and national initiatives related to multimedia search as well as domains experts that participated in the CHORUS Think-thanks and workshops, this document reports on the state of the art related to multimedia content search from, a technical, and socio-economic perspective. The technical perspective includes an up to date view on content based indexing and retrieval technologies, multimedia search in the context of mobile devices and peer-to-peer networks, and an overview of current evaluation and benchmark inititiatives to measure the performance of multimedia search engines. From a socio-economic perspective we inventorize the impact and legal consequences of these technical advances and point out future directions of research

Producers of indecent images of children : a qualitative analysis of the aetiology and development of their offending patterns

The term ‘producers of IIOC’ refers to individuals who create or are involved in the creation of indecent images of children. This thesis is a qualitative analysis of 22 interviews undertaken with individuals who produced IIOC. The production of IIOC is not a new phenomenon. However, producers of IIOC are a group about which little is known, even though they supply a large market. With the advancement of modern technology and the development of the internet, IIOC has become more readily available and easier to produce. Accordingly, it is important to gain a greater understanding of those who create such material in the interests of prevention, child safeguarding and detection. Law enforcement and the legal system worldwide are chasing the ever-advancing means of sexually abusing and exploiting children. Research and safeguarding organisations regularly highlight the exponential number of new IIOC available and the apparent increasing demand for such material. The low-age range of victims of IIOC and extreme abuse being perpetrated have been noted in seized material, and live streaming of child sexual abuse is a concerning development. The participants in this study emerged as a heterogeneous group in terms of social demographics. Their early life experiences were marked by prevalent issues such as neglect, abuse and exposure to violence. A large proportion of them had never had a long-term adult relationship and many others were either separated or divorced. Their grooming techniques were many and varied, and they presented as being able to adapt their grooming process depending upon the environment and victim. IIOC of both known and stranger victims were produced, demonstrating a variation in the relationships between perpetrators and the children who were exploited. The methodology employed to produce IIOC was examined, covering both remote and adjacent producers, as well as those who were covert about their behaviour. The cognitive distortions that supported the behaviour suggest minimising of harm and distancing techniques. The function of the production behaviour was not found to be exclusively sexual and included a variety of other motivating factors, ranging from commercial gain to social status. However, all participants acknowledged a sexual arousal to children. This research has found that the process of producing IIOC appears to be evolving. The advancement of technology, in particular the internet, makes it easier to produce IIOC and share such material with others. As sex offenders seem to be capitalising on new equipment and the increasingly mainstream culture of photographing and recording almost unreservedly, so too must law enforcement and front-line professionals keep pace. Recognising that production of IIOC may be an aspect of an individual’s sexually exploitative behaviour, even when there is initially no apparent evidence, is essential. It appears that it may be an overlooked or undetected area of offending and in turn, not dealt with in assessment, intervention and safeguarding. Future research is advisable to obtain a greater understanding of individuals who produce IIOC, in order to prevent, deter, and deal with the behaviour, as well as to help their victims

The Breeding of Wolves: Understanding the Escalation Continuum & Escalation Dynamics of Contemporary Sex Trafficking Demand

This quantitative, quasi-longitudinal research was conducted to empirically examine if sex-demand buyer behavior of heterosexual males is causational based on commonplace societal and transgenerational influences. These causational influences are termed “escalation dynamics,” which can lay on a ranged scale from adolescent development through adulthood, termed an “escalation continuum.” This research aimed to research how and why a heterosexual male becomes a sex buyer from different influences over a developmental time frame. Participants had to meet the criteria of being a heterosexual male, having been arrested for sex-demand buying, and currently participating or having completed the Sex Buyers Transformation and Restoration (STAR) Program. The 67-question My Sex Life Survey was completed online by 56 respondents. The results indicated a correlation between developmental influences, i.e., escalation dynamics, such as hegemonic masculinity, traditional male roles, internet pornography, strip clubs, and beliefs leading to the objectification of prostituted females. The research showed multiple significant inferences on sex-demand buyer behavior concerning negative heterosexual male influences from adolescents to adulthood. Furthermore, the results showed and exposed a range of sex-demand buyers as being more or less hegemonic in their masculinity traits, suggesting that men who suffer more significant strain suffer greater symptoms of hegemonic masculinity

Incentives for the adoption of e-government by Greek municipalities

Purpose: The research aims to identify the incentives that play an important role in the evolution of e-government in Greece at local scale and its actual development level. It also investigates the factors and the perceived barriers that affect the development of local egovernment in Greek Municipalities, as well as the benefits they derive from it. Design/Methodology/Approach: The research is based on a survey that was conducted through a questionnaire to all 325 Municipalities of the country and includes data from 109 Municipalities that participated in the quantitative approach. Findings: While e-government is spread at a relatively satisfactory level, it appears that only a few Municipalities are performing well. Results highlight also the two main incentives that motivate Municipalities to adopt e-government: The first is the improvement of the efficiency of information exchange with the external environment and the second is managing internal issues-relationships in conjunction with the existence of prominent IT departments. Amongst the main factors that affect e-government adoption by Local authorities, budgetary constraints stand out, while the lack of personnel specialized in Information Technologies is identified as common obstacle. Practical Implications: Findings suggest that an integrated approach to e-government is needed in order to enable organizations to minimize failures and to overcome barriers and counter risks. The capacity to align e-government applications with the increasing and evolving needs and requirements of the citizens is the key to optimizing the benefits of eGovernment at local scale. Originality/Value: There is no similar empirical research in the context of Greece; hence, it seems important to increase the knowledge about the drivers of e-government adoption, especially in the public sector at the local scale.peer-reviewe