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网点理论
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作者 赵嵩 《出版与印刷》 1998年第3期44-45,共2页
一、为什么要使用网点 在印刷或打印过程中,由于设备的结构特点,使得彩色还原过程难以使用连续调方法,这是由于彩色图像原稿的彩色多是连续的,而印刷中能够使用的油墨一般只有黄、品、青、黑4色油墨,另外在印刷中使用的平、凸、凹、孔... 一、为什么要使用网点 在印刷或打印过程中,由于设备的结构特点,使得彩色还原过程难以使用连续调方法,这是由于彩色图像原稿的彩色多是连续的,而印刷中能够使用的油墨一般只有黄、品、青、黑4色油墨,另外在印刷中使用的平、凸、凹、孔制版工艺中,只有凹印能使用墨层厚薄来再现色彩,所以印刷工艺中产生了半色调(Chalftone)的概念。这个概念是相对连续调而言的,相片、底片和手工绘画的作品都属于连续调的图像,形成这些图像的颗粒极其微小。 展开更多
关键词 数码技术 网点理论
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Trust Management Mechanism for Internet of Things 被引量:4
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作者 GU Lize WANG Jingpei SUN Bin 《China Communications》 SCIE CSCD 2014年第2期148-156,共9页
Trust management has been proven to be a useful technology for providing security service and as a consequence has been used in many applications such as P2P, Grid, ad hoc network and so on. However, few researches ab... Trust management has been proven to be a useful technology for providing security service and as a consequence has been used in many applications such as P2P, Grid, ad hoc network and so on. However, few researches about trust mechanism for Internet of Things (IoT) could be found in the literature, though we argue that considerable necessity is held for applying trust mechanism to IoT. In this paper, we establish a formal trust management control mechanism based on architecture modeling of IoT. We decompose the IoT into three layers, which are sensor layer, core layer and application layer, from aspects of network composition of loT. Each layer is controlled by trust management for special purpose: self-organized, affective routing and multi-service respectively. And the final decision-making is performed by service requester according to the collected trust information as well as requester' policy. Finally, we use a formal semantics-based and fuzzy set theory to realize all above trust mechanism, the result of which provides a general framework for the development of trust models of IoT. 展开更多
关键词 Internet of Things trustmanagement formal semantics trust decision-making
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