RCCtrust: A Combined Trust Model for Electronic Community

Previous trust models are mainly focused on reputational mechanism based on explicit trust ratings. However, the large amount of user-generated content and community context published on Web is often ignored. Without enough information, there are several problems with previous trust models: first, they cannot determine in which field one user trusts in another, so many models assume that trust exists in all fields. Second some models are not able to delineate the variation of trust scales, therefore they regard each user trusts all his friends to the same extent. Third, since these models only focus on explicit trust ratings, so the trust matrix is very sparse. To solve these problems, we present RCCtrust – a trust model which combines Reputation-, Content- and Context-based mechanisms to provide more accurate, fine-grained and efficient trust management for the electronic community. We extract trust-related information from user-generated content and community context from Web to extend reputation-based trust models. We introduce role-based and behavior-based reasoning functionalities to infer users' interests and category-specific trust relationships. Following the study in sociology, RCCtrust exploits similarities between pairs of users to depict differentiated trust scales. The experimental results show that RCCtrust outperforms pure user similarity method and linear decay trust-aware technique in both accuracy and coverage for a Recommender System.     

智慧城市体系结构:实现技术和设计挑战(英文)

Urban development is becoming increasingly reliant on effective use of intelligent services.In the process of providing better services to all citizens and improving the efficiency of administration processes,the concept of a smart city has been lauded as a promising solution for the coming challenge of global urbanization.However,due to the broad scope of smart cities their definition has not been standardized,thus proposed architectures are diverse.This work proposes a new architecture from the perspective of the data that underpins all the functionality of smart cities.The proposed architecture is discussed,outlining design challenges and offering insight into the development of smart cities.     

编码器在采煤机滚筒高度控制中的应用

为了实现采煤机摇臂高度的自动控制,提出了采煤机滚筒采高测量的问题,确定并设计了基于绝对值编码器的测量方案。阐述了采高测量的原理,建立数学模型,并确定软件设计的工作流程。     

超宽带微功率冲击雷达的抖动噪声定量分析

针对国内外其他学者对超宽带MIR接收机中的抖动噪声限于定性分析,提出了定量分析方法.基于抖动噪声的统计分布模型,推导出了在考虑波形失配的情况下的接收机效率统计分析模型,分析了其对相关接收机接收效率的影响,通过数学建模仿真分析,得到了波形失配下接收效率损失最小时的模板信号应为零阶高斯脉冲的结论,并得出了最佳的模板信号宽度.