排序方式: 共有101条查询结果,搜索用时 78 毫秒
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提出了一种基于椭圆曲线的具有消息恢复的签名方案,并对其安全性进行了分析;本方案中无需求逆运算,简化了运算复杂度。 相似文献
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In recent years, automatic identification of butterfly species arouses more and more attention in different areas. Because most of their larvae are pests, this research is not only meaningful for the popularization of science but also important to the agricultural production and the environment. Texture as a notable feature is widely used in digital image recognition technology; for describing the texture, an extremely effective method, graylevel co-occurrence matrix(GLCM), has been proposed and used in automatic identification systems. However,according to most of the existing works, GLCM is computed by the whole image, which likely misses some important features in local areas. To solve this problem, this paper presents a new method based on the GLCM features extruded from three image blocks, and a weight-based k-nearest neighbor(KNN) search algorithm used for classifier design. With this method, a butterfly classification system works on ten butterfly species which are hard to identify by shape features. The final identification accuracy is 98%. 相似文献
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通过PCL和Fortran语言开发了基于PATRAN的自升式平台强度评估程序MYWORK(Mobility Workbench)。以桁架式桩腿自升式平台为例,基于ABS自升式平台结构规范,通过对平台工作载荷、风浪流等环境载荷、P-Δ效应等的自动加载及对平台桩腿、主体结构的自动强度评估,简要介绍了MYWORK的主要功能模块、分析操作流程及MYWORK的应用。通过MYWORK的载荷预报模块及直接计算模块对某300英尺自升式平台进行了结构强度评估,评估过程及评估结果验证了MYWORK的高效性、可靠性。 相似文献
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首先回顾了江南造船与七○八所的历史成长过程和双方合作取得的辉煌成就,并通过回顾船舶科技创新的历程得到了有益的启示:(1)科技创新是一个知识不断积累,认识不断深化的过程;(2)科技创新源于文化的交流、融合;(3)科技创新必须坚持走与生产相结合的道路.期望七○八所与江南-长兴造船凝心聚力,再创美好未来. 相似文献
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梅陇站每天日均上下旅客7000人次左右,每天到发旅客列车共11对,其中:沪杭旅游特快列车4对,金山专线列车5对,嘉善专线列车2对。为了尽快发挥电子计算机售票系统优势,解决旅客买票难、乘车难,提高铁路客运市场的竞争能力,由上海铁路分局投资,在梅陇站进行电子计算机售票系统的建设。该系统包括: (1)硬件配置 相似文献
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中小型河道是我国水生态系统中的重要组成部分,但是近些年由于人类随意的开发建设,导致中小型河道出现水土流失严重的现象,并且河道的断面也在不断的减小。加之中小型河道防洪能力较差,所以在出现暴雨时,将会导致河道断面淤堵引发洪水灾害,对河道两岸居民的人身财产安全产生威胁。于此同时,若中小型河道生态环境被破坏,生物链系统将会失去平衡,水环境污染也会接踵而来,对我国生态水利保护工作的可持续发展是较不利的。所以应该加快中小型河道生态的治理,提高中小型河道的功能,增强其防洪能力,为保护生态水利创造有利的条件。 相似文献