基于评分偏好和项目属性的协同过滤算法

针对传统的协同过滤推荐由于数据稀疏性导致物品间相似性计算不准确、推荐准确度不高的问题,文中提出了一种基于用户评分偏好模型、融合时间因素和物品属性的协同过滤算法,通过改进物品相似度度量公式来提高推荐的准确度。首先考虑到不同用户的评分习惯存在差异这一客观现象,引入评分偏好模型,通过模型计算出用户对评分类别的偏好,以用户对评分类别的偏好来代替用户对物品的评分,重建用户-物品评分矩阵;其次基于时间效应,引入时间权重因子,将时间因素纳入评分相似度计算中;然后结合物品的属性,将物品属性相似度和评分相似度进行加权,完成物品最终相似度的计算;最后通过用户偏好公式来计算用户对候选物品的偏好,依据偏好对用户进行top-N推荐。在MovieLens-100K和MovieLens-Latest-Small数据集上进行了充分实验。结果表明,相比已有的经典的协同过滤算法,所提算法的准确率和召回率在MovieLens-100K数据集上提高了9%~27%,在MovieLens-Latest-Small数据集上提高了16%~28%。因此,改进的协同过滤算法能有效提高推荐的准确度,有效缓解数据稀疏性问题。     

电力电缆载流量模型及其应用研究

研究了电力电缆载流量算法模型的原理、分类方法和特性,并分析了多个实用的模型及其应用;特别介绍了SCR和DCR电缆模型、综合分析方法在电缆系统的设计、在线监测和运行优化方面的应用,并提供了一个应用案例。     

Developing a green building assessment tool for developing countries – Case of Jordan

The purpose of this research is to contribute to a better understanding of the concept of green building assessment tool and its role for achieving sustainable development through developing an effective green building rating system for residential units in Jordan in terms of the dimensions through which sustainable development tools are being produced and according to the local context. Developing such system is becoming necessary in the Developing World because of the considerable environmental, social and economical problems. Jordan as one of these countries is in need for this system, especially with poor resources and inefficient use. Therefore, this research studied international green building assessment tools such as such as LEED, CASBEE, BREEAM, GBTool, and others. Then defined new assessment items respecting the local conditions of Jordan and discussed them with (60) various stakeholders; 50% of them were experts of sustainable development. After selecting the assessment items they were weighted using the AHP method. The outcome of the research was a suggested green building assessment tool (SABA Green Building Rating System) – computer based program – that suits the Jordanian context in terms of environmental, social and economical perspectives.     

Validity and utility of a multidimensional model of received support in intimate relationships.

The authors of the present study statistically address the largely conceptual debate about the multidimensional nature of received support in intimate relationships. The Support in Intimate Relationships Rating Scale (SIRRS) was factor analyzed in 3 samples of dating and married couples. A novel, 4-factor structure of support types was generated that constituted esteem/emotional, physical comfort, informational, and tangible support types. This structure was reliable and valid in dating and marital relationships, across men and women, and across time. Each support type also demonstrated incremental validity for explaining marital adjustment, depression symptoms, and anxiety symptoms longitudinally. This study is among the first to generate and cross-validate a factor analytically derived set of support types for received support and the first to do so regarding partner support specifically. This is also the first study to replicate a distinct set of support types across different types of intimate relationships, across both sexes, and over time within relationships. Implications for enhancing functional theories of support and for augmenting the construct validity of a multidimensional model of received support are discussed. (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

单台变频器控制两台参数不同的电动机

从导轨磨机床磨头动作过程出发,引入需解决问题,进一步从原理和梯图控制上进行说明,实现控制过程.     

An assessment tool for the energy, economic and environmental evaluation of thermal insulation solutions

The paper discusses an assessment tool, used for the energy, economic and environmental evaluation of Thermal Insulation Solutions (TIS). The results of the assessment undertaken with this tool can take the form of a simple rating system in order to enable users to perform comprehensive comparisons amongst various building materials and TIS. A ranking expressed by A, B and C classes is used for energy, environmental and economic parameters. By evaluating the materials, the tool supports the users to make decisions, depending on preferences or priorities such as the energy efficiency achieved, the total cost and the environmental performance. The assessment tool is applied for the double cavity wall and the External Thermal Insulation Composite Systems (ETICS) as they are used throughout Europe, both in new constructions and in the renovation of existing buildings.     

ATSC数字电视接收机分级控制的软件实现

本文在研究ATSC数字电视的分级控制的基础上，提出了一种用于储存用户预定义分级控制级别信息的有效方法，该方法以不多的存储空间作代价换取了软件对分级控制的处理的大大简化。同时，本文也对分级控制的软件实现方法进行了讨论。     

Collaborative reputation mechanisms for electronic marketplaces

Members of electronic communities are often unrelated to each other, they may have never met and have no information on each other's reputation. This kind of information is vital in Electronic Commerce interactions, where the potential counterpart's reputation can be a significant factor in the negotiation strategy. Collaborative reputation mechanisms can provide personalized evaluations of the various ratings assigned to each user to predict their reliabilities. While these reputation mechanisms are developed in the context of electronic commerce, they are applicable in other types of electronic communities such as chatrooms, newsgroups, mailing lists, etc.     

基于软计算的资信评估研究

提出了一种基于软计算的企业资信评估模型,它集成模糊数学和遗传算法,用快速遗传k-均值算法进行聚类。结果表明,FGKA和GKA均可得到全局最优解,但FGKA速度远高于GKA。本模型用PowerBuilder和Sybase数据库实现,为ERP中的企业资信评估提供了一个新的方案。     

轻钢结构厂房设计的探讨

探讨了轻钢结构工业厂房建筑设计方面及结构设计方面中的耐火等级、防火分区、防火墙、荷载取值、屋脊垂度控制、钢柱换混凝土柱等问题。