Epidemic-based self-organization in peer-to-peer systems

Steen, M.R. [Promotor]van Tanenbaum, A.S. [Promotor

When Expanders Help Self-Healing Distributed R-Tree Overlays

International audienceWe present the first self-healing architecture for recovering semantic DR-tree overlays in response to physical nodes failures (crash). Our work builds on two of our recent results: the overlay virtualization and churn tolerant design of constant expanders for distributed R-trees. That is, the proposed self-healing strategy, in order to recover the searchability and the semantic organization of the original overlay, exploits both the randomly uniform distribution of the logical nodes on top of the physical network and the additional virtual links of the expander. The convergence time of our scheme is O(log(n)) and the height of the recovered tree is increased only by Ω(log f) with respect to the original overlay (n is the size of the network and f are the number of crashed nodes). We validate our scheme via simulations including measures of the recovery time, the recovery extra cost and finally the impact of the recovery scheme on the distributed R-tree connectivity and semantics

NASA Tech Briefs, November 1990

Topics: New Product Ideas; NASA TU Services; Electronic Components and Circuits; Electronic Systems; Physical Sciences; Materials; Computer Programs; Mechanics; Machinery; Fabrication Technology; Mathematics and Information Sciences

Creation of value with open source software in the telecommunications field

Tese de doutoramento. Engenharia Electrotécnica e de Computadores. Faculdade de Engenharia. Universidade do Porto. 200

New Advances in Stem Cell Transplantation

This book documents the increased number of stem cell-related research, clinical applications, and views for the future. The book covers a wide range of issues in cell-based therapy and regenerative medicine, and includes clinical and preclinical chapters from the respected authors involved with stem cell studies and research from around the world. It complements and extends the basics of stem cell physiology, hematopoietic stem cells, issues related to clinical problems, tissue typing, cryopreservation, dendritic cells, mesenchymal cells, neuroscience, endovascular cells and other tissues. In addition, tissue engineering that employs novel methods with stem cells is explored. Clearly, the continued use of biomedical engineering will depend heavily on stem cells, and this book is well positioned to provide comprehensive coverage of these developments

City Space + Globalization: An International Perspective

City, Space, + Globalization presents ways in which globalization affects the built environment of people in cities around the world. Architects, urban planners, geographers, historians and sociologists address topics ranging from transportation to historic preservation, from housing for different population sectors to economic change and city growth patterns. A significant common element of these papers is their shared concern with the life space of city fabric, beyond economics, beyond world markets and world trade. This life space is the neighborhood and community space of city residents. It refers to memory, to history, to tradition in the face of homogenizing global forces.https://digitalcommons.calpoly.edu/books_fac/1002/thumbnail.jp

Energy: A continuing bibliography with indexes

This bibliography lists 1428 reports, articles, and other documents introduced into the NASA scientific and technical information system from January 1, 1980 through March 31, 1980