器件变更管理

上游厂家的器件变更、停产是研发制造型企业产品设计、生产和维护中经常碰到的问题。该文介绍了器件变更及停产通知,讨论了器件变更的实施途径,这些管理和控制,对于延续产品的质量和可靠性至关重要,尤其是批量生产的产品。     

基于CDI0的高职《软件工程》课改实践与探索

本文介绍基于CDIO工程教育模式下的高职“软件工程”课改实践与思考,探索将这一理念贯穿在该课程教学的全过程,运用CDIO教育模式对该课程的教与学进行探索和实践,从而进一步增强高职软件技术专业学生的实际动手能力、独立创新能力以及团队合作能力。     

试论交换工程档案管理

工程档案管理工作是使工程文件材料向峡工档案转化的基础工作，是向档案馆提供馆藏，进行科技贮备的重要环节，也是工程管理的重要组成部分。本文介绍了交换工程档案管理的特点并就如何进行此项管理发表了个人见解。     

北京平原地热资源与地热供暖

本文对北京平原地区地热资源条件和供暖现状进行了概述,分析了地热供暖技术的特点、优势以及当前制约其推广发展的“瓶颈”,针对北京平原地热资源的可持续发展提出了两点具体建议。     

通用图形接口在导弹工程计算中的应用

针对导弹总体研制过程中工程计算结果的图形曲线生成问题,建立了应用程序通用图形接口,对该图形接口的功能进行了说明,并给出工程计算结果对应的各种图形曲线。     

实行工程监理制是工程建设的有效保证

江西地方小水电的建设单位多系临时组建工程指挥部，其成员在专业水平、项目管理、法律知识等方面往往缺乏经验，难以适应小水电建设的需要，业主与承包商之间矛盾不能及时解决，影响了工程进度。实行工程监理制，聘任监理工程师，弥补了建设单位经验不足的欠缺，在多方配合下，保证了工程进度和工程质量。     

万家寨引黄工程南干线3号隧洞出口段土洞施工

本文简要介绍了引黄工程南干线３＃隧洞出口段土洞围岩工程特性及施工情况等。     

Performance improvement for recommender systems using ontology

Recommender systems have emerged in the e-commerce domain and have been developed to actively recommend appropriate items to online users. The use of recently developed hybrid recommendation systems has helped overcome the main drawbacks of Content-Based Filtering (CBF) and Collaborative Filtering (CF). In hybrid recommendation systems that combine CF and CBF, the CF part uses two methods, including memory- and model-based approaches. Both approaches have some advantages and disadvantages for item recommendation. Sparsity has been one of the main difficulties associated with these approaches, whereas recommendation with high accuracy has been one of the important advantages of the memory-based approach. However, this approach is not scalable for current recommendation systems as their databases include huge numbers of items and users. In contrast, the model-based approach generates recommendations with low accuracy but is scalable for large databases in e-commerce recommender systems. Accordingly, to address this problem and take advantage of both approaches, in this work, we propose a new hybrid recommendation method and evaluate it using a real-world dataset. The aim is to improve efficiency and accuracy by designing a heuristic hybrid recommender method that combines memory-based and model-based approaches. Specifically, we use ontology in the CF part and improve ontology structure by eliminating uniformity of edges of the hierarchical relation between concepts (IS-A relation) in item ontology in the CBF part. Ontology structure is considered for improving accuracy; according to this, a new method for measuring semantic similarity that is more accurate than the traditional methods is presented. This new method can enhance the accuracy of CF and CBF in our method. In addition, the number of searches required to find similar clusters and neighbor users of the target user is decreased significantly using ontology, enhanced clustering and the new proposed algorithm. We evaluate the proposed method using a real-world dataset. The experimental results show that our method is more scalable and accurate than the benchmark k-Nearest Neighbor (k-NN) and model-based recommendation methods.     

海底光缆工程设计简介

从海缆的设计内容和方法、海缆系统远端供电系统的设计要求和海缆系统APS保护倒换方式等方面，详细介绍了海缆数字传输系统工程设计的要点。