共查询到20条相似文献,搜索用时 34 毫秒
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Electronic commerce (ec) is a combination of practices, strategies, processes, applications and technologies, enabling business transactions. This paper focuses on software and technologies forec. In the first part, the different categories of applications forec are reviewed. A fully integrated solution does not seem to be the major trend. However, the “best of breed” approach implies an integration problem. The second part of the paper includes modeling languages andec applications core technologies. Theuml appears to be used at different levels in the development of anec solution. Web technologies are continually evolving:XML could be the language of the future for information exchanges between heterogeneous applications. The third part deals with component and application integration. In spite of converging standards for languages as well as for models, system interoperability is a major problem, when informations are to be shared and processes to be jointed. Two major trends can be identified: Web services andEDI approaches. 相似文献
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Étude du comportement du transistor à effet de champ au GaAs sous injection optique quasi ponctuelle
This paper describes the observed phenomena while a mesfet is illuminated with a circular spot of about 1.5 μmdiameter. The various depletion regions of the device are highlighted by this technique. The experimental results can partly be explained by the photovoltaic effect associated with these depletion regions and the photoconductive effect in the channel. The high values obtained for the photoconduction responsivity are ascribed to the photoconduction mecanism itself and to the widening of the channel at the substrate interface and at the surface. 相似文献
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Maurice Bouix 《电信纪事》1954,9(12):345-351
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Maurice Bouix 《电信纪事》1954,9(11):298-304
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Maurice Bouix 《电信纪事》1954,9(10):275-281
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This paper deals with a temporal approach of interaction between an external electromagnetic wave and an arbitrary multiconductor transmission lines (Mtl). The loads of the circuits can be linear like resistance elements or non linear as is the case of field effect transistor (Mesfet). The numerical technique used is the finite differences time domain (Fdtd) witch givesMtl temporal responses with good stability. Good agreement between the results obtained by the proposed method and those by literature and Spice model verifies the validity of theFdtd algorithm. 相似文献
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Michel Kobrynski 《电信纪事》1960,15(3-4):55-60
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