A game theoretic approach to a peer-to-peer cloud storage model

Classical cloud storage based on external data providers has been recognized to suffer from a number of drawbacks. This is due to its inherent centralized architecture which makes it vulnerable to external attacks, malware, technical failures, as well to the large premium charged for business purposes. In this paper, we propose an alternative distributed peer-to-peer cloud storage model which is based on the observation that the users themselves often have available storage capabilities to be offered in principle to other users. Our set-up is that of a network of users connected through a graph, each of them being at the same time a source of data to be stored externally and a possible storage resource. We cast the peer-to-peer storage model to a Potential Game and we propose an original decentralized algorithm which makes units interact, cooperate, and store a complete back up of their data on their connected neighbors. We present theoretical results on the algorithm as well a good number of simulations which validate our approach.Comment: 10 page

The Effectiveness of the Raskin Program

The Raskin program is a subsidized rice program for poor families which provides 10 kg of rice per poor households at the price of Rp1,000 per kg. This report describes the findings of the study undertaken by the SMERU Research Institute to uncover the effectiveness of the Raskin program in achieving its objectives as well as to obtain lessons learned to improve the program. This qualitative study uses three different approaches to data collection : document review and secondary data analysis or meta- evaluation; interviews of key informants at the central level; and field study. The findings suggests that, in general, the Raskin program indicates relatively low effectiveness, that many problems emerge in the distribution of the rice from the primary distribution point to the beneficiaries, and that the issues faced are actually similar each year. The low effectiveness of the program is indicated by the lack of program socialization and transparency; inaccurate targeting, amount, and frequency of rice received by beneficiaries, as well as price of rice; high cost of program management, ineffective monitoring and evaluation; and ineffective complaint mechanism.Raskin, program evaluation, poverty reduction program

Efficient Proactive Caching for Supporting Seamless Mobility

We present a distributed proactive caching approach that exploits user mobility information to decide where to proactively cache data to support seamless mobility, while efficiently utilizing cache storage using a congestion pricing scheme. The proposed approach is applicable to the case where objects have different sizes and to a two-level cache hierarchy, for both of which the proactive caching problem is hard. Additionally, our modeling framework considers the case where the delay is independent of the requested data object size and the case where the delay is a function of the object size. Our evaluation results show how various system parameters influence the delay gains of the proposed approach, which achieves robust and good performance relative to an oracle and an optimal scheme for a flat cache structure.Comment: 10 pages, 9 figure

Bringing Home the Green Recovery: A User's Guide to the 2009 American Recovery and Reinvestment Act

The $787 billion recovery package marks a big, bold, and historic investment in creating green jobs and building more equitable communities. The package invests nearly$100 billion in funding for transportation and infrastructure, $48 billion in investments in job training and education,$41 billion for energy-related programs, and $20 billion in tax incentives for renewable energy. But without substantial advocacy from local and state groups, these historic federal investments may not end up in the communities that need them most. The in-depth guide offers tangible, up-to-date information and ideas for using and securing recovery dollars to help expand opportunity in low-income communities and communities of color. The guide is a first step in what will be a vital nationwide effort to ensure the recovery package helps all communities rise stronger than ever from this economic crisis, and that community-based organizations are at the forefront in crafting a green, equitable recovery.American Recovery and Reinvestment Act, ARRA, stimulus

Scalable grid resource allocation for scientific workflows using hybrid metaheuristics

Grid infrastructure is a valuable tool for scientific users, but it is characterized by a high level of complexity which makes it difficult for them to quantify their requirements and allocate resources. In this paper, we show that resource trading is a viable and scalable approach for scientific users to consume resources. We propose the use of Grid resource bundles to specify supply and demand combined with a hybrid metaheuristic method to determine the allocation of resources in a market-based approach. We evaluate this through the application domain of scientific workflow execution on the Grid