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Clinical applications of handheld computers

Clinical applications of handheld computers

引用

Annual IEEE symposium on Computer-Based Medical systems

作者： M.A. Grasso George Washington University School of Medicine Washington D.C. USA

As the healthcare industry continues to become more distributed, healthcare organizations are increasing their reliance on mobile links to access patient information and to update their master database at the point of care. Handheld computers have evolved into a viable platform for these systems. While initial projects have shown promise, several questions remain. This article explores the unique characteristics of handheld computers with respect to user interface design and wireless access, and introduces a prototype development effort.

关键词： Application software Handheld computers Medical services Computer displays User interfaces Operating systems Navigation Haptic interfaces distributed databases Prototypes

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A simulation model of adaptive protocols in distributed computing systems.with mobile hosts

A simulation model of adaptive protocols in distributed comp...

引用

Annual symposium on Simulation

作者： S.J. Lai A. Zaslavsky G.M. Martin Department of Computer Technology Monash University Melbourne Australia

Simulation is a scientific method which is largely dominated by computers and has allowed the testing and assessment of many models before actual implementation. The paper proposes an approach to construction of a simulation that models the behaviour of an adaptive queuing protocol (AQP). AQP was developed for database applications on mobile computers in a distributed multidatabase environment but can also be used in many other areas including distributed operating systems. By constructing the simulation model it is possible to both prove that it can be implemented, and at the same time study its expected behaviour in a mobile computing environment. The results of the simulation are analysed and discussed.< >

关键词： Computational modeling Protocols distributed computing Mobile computing Computer simulation Testing distributed databases Application software Computer applications Operating systems

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Practical spatial database access methods

Practical spatial database access methods

引用

symposium on Applied Computing

作者： B. Salzberg College of Computer Science Northeastern University Boston MA USA

Although many solutions to the problem of representing spatial data have been proposed, most are not practical. They cannot be guaranteed to perform well with large and arbitrarily distributed data collections. They may not be easily integrated with concurrency and recovery software already written for database systems. However, two proposed structures do have some guarantees, similar to those which have made the B/sup +/-tree so successful for one-dimensional data. These analytic guarantees include worst case space utilization in data and index pages, a minimal fan-out and exact match search time bounded by the height of the tree. The two methods are the holey brick tree and bit interleaving using a B/sup +/-tree. Both can also be integrated with concurrency and recovery systems.in the same way that B/sup +/-trees are.< >

关键词： Spatial databases database systems Concurrent computing Meteorology Educational institutions Computer science Data analysis Interleaved codes Application software Performance analysis

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Evaluation of distributed recovery in large-scale storage systems

Evaluation of distributed recovery in large-scale storage sy...

引用

International symposium on High Performance distributed Computing

作者： Qin Xin E.L. Miller S.J.T.J.E. Schwarz Storage Systems Research Center University of California Santa Cruz USA

Storage clusters consisting of thousands of disk drives are now being used both for their large capacity and high throughput. However, their reliability is far worse than that of smaller storage systems.due to the increased number of storage nodes. RAID technology is no longer sufficient to guarantee the necessary high data reliability for such systems. because disk rebuild time lengthens as disk capacity grows. We present fast recovery mechanism (FARM), a distributed recovery approach that exploits excess disk capacity and reduces data recovery time. FARM works in concert with replication and erasure-coding redundancy schemes to dramatically lower the probability of data loss in large-scale storage systems. We have examined essential factors that influence system reliability, performance, and costs, such as failure detections, disk bandwidth usage for recovery, disk space utilization, disk drive replacement, and system scales, by simulating system behavior under disk failures. Our results show the reliability improvement from FARM and demonstrate the impacts of various factors on system reliability. Using our techniques, system designers will be better able to build multipetabyte storage systems.with much higher reliability at lower cost than previously possible.

关键词： Large-scale systems Disk drives Costs Bandwidth Throughput Buildings Computational modeling Application software reliability engineering Internet

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Reconfiguration of RAID-like data layouts in distributed storage systems

Reconfiguration of RAID-like data layouts in distributed sto...

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International symposium on Parallel and distributed Processing (IPDPS)

作者： P. Sobe Institute of Computer Engineering University of Lübeck Germany

Summary form only given. Clustering of several storage servers is a common way to build fast and fault tolerant storage systems. One application can be found in the context of parallel programs that already run on clustered systems.and need to write and read a huge amount of data from and to disks. Another application field are Web and video streaming server that cause intense data transfer from and to disks. A distributed storage system is reviewed under the aspect of fault tolerance and reconfiguration of the data layout after faults. Data objects are stored in a data layout according to RAID level 3 among disk subsystems.of different computers. Concurrent up-and down-streaming of data is provided by a technique that ensures data consistency. This consistency has been found to be beneficial for concurrent access and reconfiguration. Beyond, the system does not need a meta-data server, which often represents a bottleneck for distributed storage systems.

关键词： Fault tolerant systems Computer networks File systems Storage area networks Application software Streaming media Computer network reliability Network servers Scalability Communication system control

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Enforcing quality of service of distributed objects

Enforcing quality of service of distributed objects

引用

International symposium on software reliability Engineering (ISSRE)

作者： A. Avritzer E.J. Weyuker AT&T Network Computing Services Redhill NJ USA AT and T Research Laboratories Florham Park NJ USA

Three algorithms designed to enforce different quality of service criteria are presented, as well as empirical assessments of the algorithms for three large industrial telecommunications systems. These assessments are made in terms of the simulated performance of each system on average loads selected from operational distributions collected during beta release and field use. In addition, synthetic heavy loads designed to cause the overall CPU utilization rates to exceed 90% of capacity were run. The algorithms build on previously defined load testing algorithms, and use parameters and operational distributions computed for that purpose. This makes the quality of service enforcement algorithms particularly efficient. The primary bases for the assessment of the algorithms were the overall deviation of the response time from the average, and the fraction of service requests that were throttled from clients under varying conditions.

关键词： Quality of service System testing Delay software testing State-space methods Algorithm design and analysis Communication industry Computer industry software systems Performance evaluation

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Lightweight logging and recovery for distributed shared memory over virtual interface architecture

Lightweight logging and recovery for distributed shared memo...

引用

International symposium on Parallel and distributed Computing

作者： Soyeon Park Youngjae Kim Seung Ryoul Maeng Department of Electrical Engineering and Computer Science Korea Advanced Institute of Science and Technology South Korea

ISBN: (纸本)0769520693

As software distributed Shared Memory(DSM) systems.become attractive on larger clusters, the focus of attention moves toward improving the reliability of systems. In this paper, we propose a lightweight logging scheme, called remote logging, and a recovery protocol for home-based DSM. Remote logging stores coherence-related data to the volatile memory of a remote node. The logging overhead can be moderated with high-speed system area network and user-level DMA operations supported by modern communication protocols. Remote logging tolerates multiple failures if the backup nodes of failed nodes are alive. It makes the reliability of DSM grow much higher. Experimental results show that our fault-tolerant DSM has low overhead compared to conventional stable logging and it can be effectively recovered from some concurrent failures.

关键词： Protocols Computer architecture Fault tolerance Computer network reliability Telecommunication network reliability Workstations Personal communication networks Parallel processing Parallel programming Scalability

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A signal processing approach to global predicate monitoring

A signal processing approach to global predicate monitoring

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Reliable distributed systems

作者： N. Ghafari R.E. Seviora Bell Canada Software Reliability Laboratory University of Waterloo Waterloo ONT Canada

Global predicate evaluation is a fundamental problem in distributed systems. This paper views it from a different perspective, namely that of the signals and systems.area of electrical engineering. It adapts a signal processing approach to address this problem in the context of monitoring of 'health' of a software system. The global state of the system is viewed as a 'state' signal which evolves over time. The distributed processes are assumed to possess roughly synchronized clocks. The states of individual processes are periodically sampled and reported to a global monitor. The observed system state constructed by the global monitor is viewed as being composed of two components - the consistent global states and an error signal due to the messages in transit and differences in the local clocks. The global monitor removes the error signal by processing the observed global signal through a low-pass filter. It evaluates the predicates on the filtered signal. The approach presented is applicable to distributed systems.which are semi-stationary, i.e. whose internal states of interest remain stable over comparatively long intervals of time. The paper presents the relevant signal processing concepts (p-spectrum and p-filtering), outlines an architecture for global predicate monitoring and describes the signal processing done in the global monitor. The paper then summarizes an evaluation of the approach presented on a small computer aided vehicle dispatch system. The evaluation experiments are described and the results are presented and analyzed.

关键词： Signal processing software systems Signal processing algorithms software reliability Laboratories Clocks Low pass filters Computerized monitoring Optical signal processing Costs

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Neural networks for the design of distributed, fault-tolerant, computing environments

Neural networks for the design of distributed, fault-toleran...

引用

Reliable distributed systems

作者： R. Geist D. Suggs Department of Computer Science Clemson University Clemson SC USA

Binary optimization models for the design of distributed, fault-tolerant computing systems.are considered, with a focus on the task allocation and file assignment modeling schema proposed by J. Bannister and K. Trivedi (Proc. Second Symp. on reliability in distributed software and database systems. 1982). It is shown that R. Graham's (1969) partitioning algorithm, S, when applied to this schema can, in the case of finite resources, yield allocations that are arbitrarily poor with respect to the optimum allocation. This contrasts sharply with the case of ample resources, where S provides allocations that are provably close to the optimum. Two alternative allocation algorithms are suggested. Both are seen to deliver allocations preferable to those provided by S, but at some additional computational expense.< >

关键词： Neural networks Fault tolerance Computer networks distributed computing Fault tolerant systems Resource management Simulated annealing Design optimization Shape control Hopfield neural networks

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Computer communications for factory automation

Computer communications for factory automation

引用

IEEE International symposium on Industrial Electronics (ISIE)

作者： A.C. Weaver R. Simoncic Computer Networks Laboratory University of Virginia Charlottesville VA USA

Factory communications in the 1990s have all the complexity of full-fledged distributed systems. While emerging standards such as Fieldbus solve the interconnection problem, in general they do not address the more general problem of reliable, transparent communication among cooperating, distributed applications. These new applications are known to require network layer and transparent layer services to achieve reliable end-to-end communication across an arbitrary network topology. The Xpress Transfer Protocol is designed to solve this problem by providing increased functionality and performance in the general area of real-time systems.control.< >

关键词： Manufacturing automation Telecommunication network reliability Application software Production facilities Communication standards Field buses Computer network reliability Network topology Protocols Real time systems

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