p2pDating: Real life inspired semantic overlay networks for Web search

We consider a network of autonomous peers forming a logically global but physically distributed search engine, where every peer has its own local collection generated by independently crawling the Web. A challenging task in such systems is to efficiently route user queries to peers that can deliver high quality results and be able to rank these returned results, thus satisfying the users’ information need. However, the problem inherent with this scenario is selecting a few promising peers out of an a priori unlimited number of peers. In recent research a rather strict notion of semantic overlay networks has been established. In most approaches, peers are connected to other peers based on a rigid semantic profile by clustering them based on their contents. In contrast, our strategy follows the spirit of peer autonomy and creates semantic overlay networks based on the notion of “peer-to-peer dating”. Peers are free to decide which connections they create and which they want to avoid based on various usefulness estimators. The proposed techniques can be easily integrated into existing systems as they require only small additional bandwidth consumption as most messages can be piggybacked onto established communication. We show how we can greatly benefit from these additional semantic relations during query routing in search engines, such as Minerva, and in the JXP algorithm, which computes the PageRank authority measure in a completely decentralized manner.     

安全网络数学计算协议

讨论了网络数学计算框架 IAMC的安全性问题,给出了一个用安全协议 SSL/TIS提高数学计算协议MCP安全性的实现方案.改进后的网络数学计算框架可有效地提供计算数据的机密性、完整性和用户认证等安全功能.     

CA6140普通车床的数控化改造设计

文章介绍了CA6140普通机床改造成为采用GSK980T数控系统控制的经济型简单数控机床的改造设计方案。可为广大普通设备的挖潜改造提供参考。     

受控签名在泛在电力物联网中的应用研究

为改善用户体验,保证互联网应用场景安全,通过应用移动终端密码算法、密码协议和密码产品实现移动端数字签名,基于安全多方计算,通过一系列交互协议,建立多方协作方式实现密码支撑。结合当前身份认证和通信内容保护的实际需求,依据国家密码管理局发布的 SM2 椭圆曲线算法实现原理,设计 SM2 受控签名方案。在该方案中,可通过多方产生并保管一部分密钥分量,协作完成数字签名密码操作,因此可保证电力泛在物联网应用场景安全,实现移动端数字签名,提升系统安全性。     

光栅图形反走样的加权区域采样算法

反走样算法是研究利用光栅显示器光滑的显示图形的重要方法 .给出了能较好地改善图形显示效果的加权区域采样算法     

震后滑坡对陡峭山区小流域水文响应过程的影响——以汶川地震影响区小流域为例(英文)

目的:明确汶川地震所引发的滑坡对震区小流域水文响应过程的影响,推进震区洪水过程的准确预报。创新:评估汶川地震对碱坪沟流域的下垫面条件的破坏,并在此基础上利用先进的分布式水文模型定量评估地震事件对小流域产汇流过程的影响。方法:1.选取四川省龙溪河地区的碱坪沟小流域作为研究区域,利用遥感影像数据以及数字高程数据获得滑坡区的分布以及高程变化情况;2.运用基于物理概念的综合水文模型(In HM)对该流域水文过程进行模拟精度验证;3.对滑坡发生前后的降雨产流过程分别进行数值模拟,探讨在同样降雨条件下,由于滑坡所引起的下垫面特性变化对产流过程的影响。结论:1.震后滑坡灾害所带来的下垫面变化导致了流域内的山洪特性变化,且在流域内局部地区的表现更为明显,局部山洪危害增加;2.与震前相比,随着暴雨规模的增强,震后下垫面变化所致的流量峰值增量也随之增加,峰值的增加比例在6小时雨量达到235 mm时急剧增大,但降雨持续增强后趋近于稳定值(约87%)。     

U形汽车覆盖件成形数值模拟分析

文章对U形车身碰撞盒进行了结构分析,按照结构特点对该零件进行了几何建模和有限元建模,从而进行了冲压成形数值模拟分析。     

混凝土三维细观力学模型分析

混凝土的级配及骨料含量对其宏观力学特性有直接影响,选择合适的骨料模型是进行混凝土细观力学数值模拟的前提,在已提出的三维随机凸多面体骨料模型的基础上选择合适的试件模型并进行有限元剖分,利用并行计算技术分别对湿筛混凝土试件三维球形骨料和凸多面体骨料细观模型进行了静载弯拉破坏数值模拟对比计算。计算结果表明,三维凸多面体骨料生成算法是可行的,能够满足混凝土三维细观力学模拟的需要。