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Articles 1771 - 1778 of 1778

Full-Text Articles in Computer Sciences

Efficient Interconnection Schemes For Vlsi And Parallel Computation, Ronald I. Greenberg Sep 1989

Efficient Interconnection Schemes For Vlsi And Parallel Computation, Ronald I. Greenberg

Computer Science: Faculty Publications and Other Works

This thesis is primarily concerned with two problems of interconnecting components in VLSI technologies. In the first case, the goal is to construct efficient interconnection networks for general-purpose parallel computers. The second problem is a more specialized problem in the design of VLSI chips, namely multilayer channel routing. In addition, a final part of this thesis provides lower bounds on the area required for VLSI implementations of finite-state machines. This thesis shows that networks based on Leiserson's fat-tree architecture are nearly as good as any network built in a comparable amount of physical space. It shows that these "universal" networks …

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Fault Tolerance In A Very Large Database System: A Strawman Analysis, Amit P. Sheth Jun 1989

Fault Tolerance In A Very Large Database System: A Strawman Analysis, Amit P. Sheth

Kno.e.sis Publications

A simple model is used to study the effect of fault-tolerance techniques and system design on system availability. A generic multiprocessor architecture is used that can be configured in different ways to study the effect of system architectures. Important parameters studied are different system architectures and hardware fault-tolerance techniques, mean time to failure of basic components, database size and distribution, interconnect capacity, etc. Quantitative analysis compares the relative effect of different parameter values. Results show that the effect of different parameter values on system availability can be very significant. System architecture, use of hardware fault tolerance (particularly mirroring), and data …

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Randomized Routing On Fat-Trees, Ronald I. Greenberg, Charles E. Leiserson Jan 1989

Randomized Routing On Fat-Trees, Ronald I. Greenberg, Charles E. Leiserson

Computer Science: Faculty Publications and Other Works

Fat-trees are a class of routing networks for hardware-efficient parallel computation. This paper presents a randomized algorithm for routing messages on a fat-tree. The quality of the algorithm is measured in terms of the load factor of a set of messages to be routed, which is a lower bound on the time required to deliver the messages. We show that if a set of messages has load factor lambda on a fat-tree with n processors, the number of delivery cycles (routing attempts) that the algorithm requires is O(lambda + lg n lg lg n) with probability 1-O(1/n). The best previous …

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A Tool For Integrating Conceptual Schemas And User Views, Amit P. Sheth, James A. Larson, Aloysius Cornelio, Shamkant B. Navathe Feb 1988

A Tool For Integrating Conceptual Schemas And User Views, Amit P. Sheth, James A. Larson, Aloysius Cornelio, Shamkant B. Navathe

Kno.e.sis Publications

An interactive tool has been developed to assist database designers and administrators (DDA) in integrating schemas. It collects the information required for integration from a DDA, performs essential bookkeeping, and integrates schemas according to the semantics provided. The authors present the capabilities of this tool by discussing the integration methodology and the user interface of the tool.

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Academically-Sponsored Coastal Research Vessels In The New England Region: An Assessment Of Current Management And Implications For The Future, Brendan B. Mcavoy Jan 1988

Academically-Sponsored Coastal Research Vessels In The New England Region: An Assessment Of Current Management And Implications For The Future, Brendan B. Mcavoy

Marine Affairs Theses and Major Papers

In New England an informal communications network exists between coastal research vessel operating institutions. Vessel scheduling and operational support has been identified as adequate for the current amount of research being conducted within the region. However, societal shift towards coastal regions is prompting an increase in attention to research within the coastal zone. Current and pending federal initiatives are responding to this increased research need. This, in turn, is beginning to impose greater demands on coastal vessel sea-time. Therefore, a strengthening of the region's inter-institutional communications network may be warranted for the future in order to better coordinate coastal research …

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Randomized Routing On Fat-Trees, Ronald I. Greenberg Oct 1985

Randomized Routing On Fat-Trees, Ronald I. Greenberg

Computer Science: Faculty Publications and Other Works

Fat-trees are a class of routing networks for hardware-efficient parallel computation. This paper presents a randomized algorithm for routing messages on a fat-tree. The quality of the algorithm is measured in terms of the load factor of a set of messages to be routed, which is a lower bound on the time required to deliver the messages. We show that if a set of messages has load factor lambda on a fat-tree with n processors, the number of delivery cycles (routing attempts) that the algorithm requires is O(lambda+lgnlglgn) with probability 1-O(1/ …

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An Analysis Of The Effect Of Network Load And Topology On The Performance Of Concurrency Control Algorithm In Distributed Database Systems, Anoop Singhal, Amit P. Sheth, Ming T. Liu Dec 1984

An Analysis Of The Effect Of Network Load And Topology On The Performance Of Concurrency Control Algorithm In Distributed Database Systems, Anoop Singhal, Amit P. Sheth, Ming T. Liu

Kno.e.sis Publications

Earlier studies in the performance analysis of concurrency control algorithms in distributed database systems (DDBS) have assumed that the message transmission time between any two nodes of a network is constant. Hence they disregard the effect of communication subnet related parameters such as network traffic, network topology, the capacity of transmission channels and the size of messages transmitted. In this paper an analytical model is used to estimate the delays in transmission channels for a DDBS in a long haul network. The analysis shows that the constant transmission time assumption cannot be justified in many cases and that response time …

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Ua66 Ogden Instructional Computing Newsletter, Vol. 1, No. 2, Wku Computer Science Sep 1979

Ua66 Ogden Instructional Computing Newsletter, Vol. 1, No. 2, Wku Computer Science

WKU Administration Documents

Newsletter created by WKU Computer Science regarding the department, campus computer use and curriculum.

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