摘要 :
This paper discusses why Software Engineering (SE) methods often fail to produce software systems that meet their performance requirements. Five issues are raised: lack of required scientific principles and models in SE, lack of e...
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This paper discusses why Software Engineering (SE) methods often fail to produce software systems that meet their performance requirements. Five issues are raised: lack of required scientific principles and models in SE, lack of education in performance, IT workforce shortage, single-user and small database mindsets.
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摘要 :
This paper discusses why Software Engineering (SE) methods often fail to produce software systems that meet their performance requirements. Five issues are raised: lack of required scientific principles and models in SE, lack of e...
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This paper discusses why Software Engineering (SE) methods often fail to produce software systems that meet their performance requirements. Five issues are raised: lack of required scientific principles and models in SE, lack of education in performance, IT workforce shortage, single-user and small database mindsets.
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A new inline 4-cylinder gasoline engine has been developed for use on small passenger cars. New technologies adopted to reduce costs and improve performance include a plastic air intake module with an electronic throttle chamber, ...
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A new inline 4-cylinder gasoline engine has been developed for use on small passenger cars. New technologies adopted to reduce costs and improve performance include a plastic air intake module with an electronic throttle chamber, continuously variable valve timing control (C-VTC), a fine spray fuel injector and a catalyst substrate with a low heat mass. This new engine ranks among the best in its class in providing an optimum balance of power, torque and fuel economy. It also complies with the J-ULEV requirements of Japanese new exhaust emission regulations. This paper describes the major technological features of the new engine.
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The new inline 4-cylinder QR engine series is available in 2.0 liter and 2.5 liter displacement version. By adopting such new and improved technologies as a compact balancer system, a continuously variable valve timing control(CVT...
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The new inline 4-cylinder QR engine series is available in 2.0 liter and 2.5 liter displacement version. By adopting such new and improved technologies as a compact balancer system, a continuously variable valve timing control(CVTC) system, a dual close-coupled catalyst system, a two-stage cooling system and a direct-injection system, The new- generation QR engine series provides an optimum balance of power, quietness and good fuel economy.
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2 liter DOHC-VTEC engine was newly developed for the sports-car "S2000". It produced the highest power-output as a natural aspirated mass-production 2-liter engine in the world. It also achieved a half of the emission level of 200...
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2 liter DOHC-VTEC engine was newly developed for the sports-car "S2000". It produced the highest power-output as a natural aspirated mass-production 2-liter engine in the world. It also achieved a half of the emission level of 2000 year Japaneseexhaust emission regulation at the same time. The new engine utilized a newly designed VTEC cylinder head, new construction cylinder block, cam-shaft chain drive system, metal honeycomb catalyst and many other new technological elements. This paper will describe the major specifications, generalconstruction, technological features, power-output and exhaust emission characteristics of the engine.
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摘要 :
When designing and evaluating software architectures and network facilities for hosting demanding distributed applications, taking performance considerations into account is essential. A key factor in assessing the performance of ...
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When designing and evaluating software architectures and network facilities for hosting demanding distributed applications, taking performance considerations into account is essential. A key factor in assessing the performance of such a distributed system is the network latency and its relation to the application behaviour. In this respect, it is important to include the performance impact of the network into the performance models used during the entire design cycle of the system.A framework is proposed that allows to model both the software and the network components separately and extracts a single set of performance estimates for the entire system. This has the advantage of allowing the network and software aspects to be modeled separately using the modeling languages and tools most suited to those system aspects. A case study is presented to illustrate the use of the framework and its usefulness in predicting system performance.
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摘要 :
When designing and evaluating software architectures and network facilities for hosting demanding distributed applications, taking performance considerations into account is essential. A key factor in assessing the performance of ...
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When designing and evaluating software architectures and network facilities for hosting demanding distributed applications, taking performance considerations into account is essential. A key factor in assessing the performance of such a distributed system is the network latency and its relation to the application behaviour. In this respect, it is important to include the performance impact of the network into the performance models used during the entire design cycle of the system.A framework is proposed that allows to model both the software and the network components separately and extracts a single set of performance estimates for the entire system. This has the advantage of allowing the network and software aspects to be modeled separately using the modeling languages and tools most suited to those system aspects. A case study is presented to illustrate the use of the framework and its usefulness in predicting system performance.
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The CompSysTech'07 International conference is organised by the Academic Society of Computer Systems and Technologies. The conference objective is to intensify the information exchange of the results in theoretical research and pr...
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The CompSysTech'07 International conference is organised by the Academic Society of Computer Systems and Technologies. The conference objective is to intensify the information exchange of the results in theoretical research and practical developments in this field.
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摘要 :
The CompSysTech'07 International conference is organised by the Academic Society of Computer Systems and Technologies. The conference objective is to intensify the information exchange of the results in theoretical research and pr...
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The CompSysTech'07 International conference is organised by the Academic Society of Computer Systems and Technologies. The conference objective is to intensify the information exchange of the results in theoretical research and practical developments in this field.
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摘要 :
While a service-oriented approach to software engineering has become popular in recent times, the actual performance of systems composed from many distributed parts is still largely unpredictable. We describe our recent research a...
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While a service-oriented approach to software engineering has become popular in recent times, the actual performance of systems composed from many distributed parts is still largely unpredictable. We describe our recent research applying performance test-bed generation techniques to service-oriented architectural models as an advance on the state of the art in performance engineering of service-oriented software. We outline our related research on tools for business process composition, performance engineering and dynamic system architectures.
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