The scalability and reliability of secondary storage systems.are their most significant aspects for advanced database applications. Research on high-function disks has recently attracted a great deal of attention beca...
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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 m...
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A distributed real-time system testbed to support experimental research has been established at the University of Texas at Arlington (UTA). The testbed, named SUVS (Simplified Unmanned Vehicle System), is being used t...
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ISBN:
(纸本)089791502X
A distributed real-time system testbed to support experimental research has been established at the University of Texas at Arlington (UTA). The testbed, named SUVS (Simplified Unmanned Vehicle System), is being used to conduct experimental evaluation of techniques and methods for design of reliable distributed real-time systems. Thus far, SUVS has been primarily successful in experimentation with system level fault tolerance techniques. The SUVS is planned for clinical study of specification, design and implementation methods studied at UTA for real-time distributed/parallel systems. The software part of SUVS consists of a set of sensor tasks, analyzer tasks, and actuator tasks. The first version of SUVS was implemented using Verdix Ada on Micro Vax 3900/Utrix. The second version reported here is written in C and is running on a network of eight SUN Workstations. The need for cooperation among tasks in error detection and recovery is the major factor behind choosing the conversation scheme in fault-tolerant (FT-SUVS). A classic TMR-like voting scheme has also been implemented for FT-SUVS. We demonstrate how the multiple versions of software can be generated in a systematic way for this type of application. The target implementation for FT-SUVS is a hybrid parallel architecture. (This architecture is simulated in a network of SUN Workstations.) The implementation details of FT-SUVS and the preliminary timing and reliability measurements (in the presence of various injected faults) are discussed. These results indicated that the FT-SUVS framework is very useful in developing experimental approaches for design of reliable distributed real-time systems.
softwarereliability is an essential design metric in emerging large-scale multiprocessor embedded systems. Designers should identify soft error susceptibility of multiple applications executing in parallel early in t...
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To meet the growing demand for online transaction processing, several DB (database management) and DC (data communication management) subsystems.can be coupled together to form a distributed DB/DC system. A recovery p...
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ISBN:
(纸本)0818607491
To meet the growing demand for online transaction processing, several DB (database management) and DC (data communication management) subsystems.can be coupled together to form a distributed DB/DC system. A recovery protocol is needed not only to provide for the recovery of transactions affected by the failure, but also to localize recovery operations. Two such protocols based on a progressive approach, namely, a synchronous progressive and an asynchronous progressive protocol, along with a pessimistic protocol, are analyzed. Their performance during normal transaction processing is contrasted with that of a transaction processing system without any recovery protocol. A queuing model is developed and simulated to predict the transaction response time. The progressive recovery approach is found to reduce normal processing overhead and lead to performance improvement over the pessimistic approach.
The design of complex softwaresystems.is a challenging task because it involves a wide range of quality attributes such as security, performance, reliability, to name a few. Dealing with each of these attributes requ...
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ISBN:
(纸本)9781565553415
The design of complex softwaresystems.is a challenging task because it involves a wide range of quality attributes such as security, performance, reliability, to name a few. Dealing with each of these attributes requires specific set of skills, which quite often, involves making various trade-offs. This paper proposes a novel Model-Driven software Performance Engineering (MDSPE) process that can be used for performance analysis requirements of distributedsoftwaresystems. An example assessment is given to illustrate how our MDSPE process can comply with wellknown performance models to assess the performance measures.
As a basic reliability guarantee technology in distributedsystems. failure detection provides the ability of timely detecting the liveliness of runtime systems. Effective Failure Detection is very important to J2EE a...
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The proceedings contain 25 papers. The special focus in this conference is on software tool and its development. The topics include: purely functional global variables;compiler support for profiling C++ template metap...
ISBN:
(纸本)9789949231782
The proceedings contain 25 papers. The special focus in this conference is on software tool and its development. The topics include: purely functional global variables;compiler support for profiling C++ template metaprograms;database-driven tool support for DisCo executable specifications;a multi-layer diagrammatic (Meta) modelling environment;the INTEGRA tool integration framework;a model for language-independent mobile agents;layered artificial intelligence framework for autonomous agents;interleaving human and search-based software architecture design;class and object model conformance using OWL2 reasoners;bounded saturation based CTL model checking;automated code synthesis for run-time verification of distributed embedded systems.a declarative approach to solving challenging search problems;personalized side-quest generation for computer role-playing games;adjusting effort estimation using micro-productivity profiles;quantitative system reliability approach for optimizing IT security costs in an AI environment;component reuse in ensemble-based medical image processing applications;extended choice relation framework for workflow testing and towards more reliable C++ template metaprograms.
In this paper, we present our approach to developing global picture archiving and communication system (PACS) remote consultation and diagnosis (RCD) application using the Open software Foundation (OSF) distributed Co...
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ISBN:
(纸本)0819417831
In this paper, we present our approach to developing global picture archiving and communication system (PACS) remote consultation and diagnosis (RCD) application using the Open software Foundation (OSF) distributed Computing Environment (DCE) services and toolkits. The current RCD system now uses programming services similar to those offered by OSF DCE, the Cell Directory Service, the distributed Time Service, the Security Service, the RPC Facility, and the Threads Facility. In this research we have formally applied OSF DCE services to the Global PACS RCD software. The use of OSF DCE services for Global PACS enables us to develop a robust distributed structure and new user services which feature reliability and scalability for Global PACS environments.
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