OPEN-CLE: Sakai Integration with federated repositories. Angela Rabuck Mustansar Mehmood, Carlos Solis Rice University. Outline. Introduction IBM SUR Grant Federated searching Connexions DSpace Building “Collections” Next Steps Summary. Project Overview. Objectives:
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OPEN-CLE: Sakai Integration with federated repositories
Mustansar Mehmood, Carlos Solis
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IBM WebSphere Application Server
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Sakai Learning and Collaboration System
IBM Enterprise Service Bus
Rice Open CLE
IBM WebSphere Application Server
Title Release Date End Date
Automata 10/11/2006 07/21/2007
Java ME 12/12/2007 04/12/2007
Search Theory 02/05/2007 03/01/2007
Automata are abstract mathematical models of machines that perform computations on an input by moving through a series of states or configurations. If the computation of an automaton reaches an accepting configuration it accepts that input. At each stage of the computation, a transition function determines the next configuration on the basis of a finite portion of the present configuration.
Turing machines are the most general automata. They consist of a finite set of states. Since Turing machines can leave symbols on their tape at the end of the computation, they can be viewed as computing functions: the partial recursive functions. Despite the simplicity of these automata, any algorithm that can be implemented on a computer can be modeled by some Turing machine.
What is a Broadband Network?
This module explains about broadband networks, an entity to be considered in future Telecommunication Networks..
Network Information Theory: Multi-Access and Broadcast Channels
This is a brief summary of what has been known about network information theory. It covers multi access and broadcast channels, in an attempt to summarize about two dozen scattered papers in both subjects.
What is the role of teletraffic engineering in broadband networks?
In communications, a technique for transmitting a large amount of information, including voice, data, and
video, over long distances.
Network information theory is the study of reliable communication in a network setting, where there are many
sources and users who wish to communicate with one another.
Teletraffic engineers use their basic knowledge of statistics, the nature of traffic, their practical models,
their measurements and simulations to make predictions and to plan telecommunication networks at minimum total cost
In a previous work we have analyzed a family of antibody and B-cell network models (basic AB models) of the immune system.
This analysis focused principally on the physiological interpretation of their parameters. Our approach consisted in building a detailed and general mathematical model (referred to as the GIB model) and then simplifying it formally to a version (named the RIB model) that belongs to the family of AB models, but which is more general than the basic AB models. From that study it was clear that some of the assumptions necessary to simplify the GIB model into the RIB one, as well as to recover the basic AB models from the RIB one, are quite unrealistic from physiological point of viewAll this raised the issue of the reliability, or even the heuristic value, of theoretical studies based on current network models for experimental immunologists. One approach to clarify this issue is to ask whether the unrealism of the assumptions implicit in the RIB and AB models entails qualitatively different behaviors between them compared to the GIB one. We initiate here such a work by performing a comparative study of a two-clone system of the AB and RIB models, and a variant of the GIB model in which the different molecular compartments were merged into a single one (labeled IGB model). Because all those models rely critically on certain B-cell activation functions, which constitute the core of an implicit model of individual B-cell reactivity or "local rules", we focused the present numerical study, to a great extent, on two parameters determining those activation functions (Hill coefficient and thresholds). Our results indicate that: (1) the RIB and IGB models display in general a much larger diversity of steady states than the AB models; (2) only under a very restricted parameter regime did all studied models behave similarly; (3) the parameter regime under which the AB and IGB models, but not the RIB one, behave similarly is still rather restricted through not as much as in (2); and (4) even relatively small quantitative changes (within reasonable values) in the postulated "local rules" can induce very large quantitative changes in the behavior of the AB and RIB models but not the IGB model. In the light of the present results, we discuss the need of postulating a set of "local rules" solidly based on experimental evidence as a necessary condition for the reliability of current network models.