计算机网络安全现状及对策

网络已成为获取各种信息的重要手段,人们在享受着网络带来快乐的同时,也面临着越来越严重和复杂的网络安全威胁和难以规避的风险。该文从网络安全定义入手,全面分析了影响网络安全的因素,从而提出计算机网络安全防范相关措施,以确保网络安全有效运行。     

The moderating effects of psychological reactance and product involvement on online shopping recommendation mechanisms based on a causal map

The use of the Internet in the daily activities of individuals and firms has become entrenched, and online shopping has become commonplace. However, debates about how online shopping recommendation mechanisms (OREMs) should be designed have not been completely resolved. The challenge with traditional online shopping recommendation mechanisms (TR-OREMs) is that they focus too much on quantitative factors. Thus, they ignore causal interrelationships with qualitative factors that are believed to significantly impact quantitative factors. Considering only quantitative factors and ignoring qualitative ones likely distorts the final recommendation results. Another problem with TR-OREMs is that they ignore the perceived psychological reactance of consumers against the recommended products. Such consumer reactance may be reduced when the causal interrelationships among all the quantitative and qualitative factors are analyzed and incorporated properly into the OREM. To overcome these problems, we propose a causal map – online shopping recommendation mechanisms (CM-OREMs) based on a causal map. We analyzed possible causal relationships among quantitative and qualitative factors and incorporated them in the recommendation process to reduce consumer reactance against the recommendation results. Furthermore, an elaboration likelihood model (ELM) was used to build hypotheses about how the online shopping behavior of consumers is affected by OREMs based on the proposed causal map. Specifically, the performance of the proposed OREM was empirically analyzed by gathering experiment data from qualified respondents who were asked to refer to the proposed OREM before making purchasing decisions via mobile phones. Statistical results showed that the proposed OREMs could enhance consumer decision satisfaction, decision confidence, and attitude toward the recommended products. It could also positively affect consumer purchasing intentions. The OREM had a greater effect on the high-reactance group of participants than on the low-reactance group as well as on a high-involvement product versus a low-involvement product.     

可靠实现煤矿双机热备系统的方法

在分析商用双机热备系统在煤矿应用的局限性基础上,提出了一种适用于中小煤矿的双机热备系统纯软件实现方法。该方法采用单/双工混合运行模式保证双机实时性能和数据一致性,采用心跳线连接和对等网络消息传递机制实现运行故障监测与传递功能,采用数据自动同步技术减少人工干预和提高系统可维护性,并采用虚拟IP地址技术实现应用层透明访问和无缝切换功能。实验与应用案例证明该方法符合相关行业安全标准并具备现实可行性。     

IEEE802．11MAC层性能分析及改进方案

IEEE802．11作为无线局域网的MAC层规范而被广泛研究。介绍了IEEES02．11MAC协议中最基本的功能-DCF（分布式协调功能）的访问机制。在DCF研究的基础上对MAC层的性能进行了研究和分析,并针对802．11DCF的退避机制问题提出改进方案。     

试论高校计算机开放实验室运行机制的创新

分析开放实验室的问题,从研究运行机制入手,提出多层次、多功能、一体化的综合性计算机开放实验室解决方法,并对改进后的运行机制进行效果分析和应用论证。     

机制主义方法与人工智能统一理论——人工智能的新方法与新进展

报导人工智能研究的一项重要进展:由于发现了人工智能研究的"机制主义"模拟方法和"知识的生态学结构",使原来"鼎足三分"的3个主流学说(结构模拟、功能模拟和行为模拟学说)在"机制主义方法"的基础上实现了和谐的统一,形成了统一理论,从而为人工智能的发展提供了新的基础。     

校企合作过程中质量保证和评估机制研究(英文)

College-enterprise cooperation model is a new model of cultivating application-typed talents in college by cooperating with enterprises.This thesis puts forward a set of quality assurance and evaluation mechanism,practice shows that this mechanism can effectively guarantee the teaching quality and evaluate the teaching results scientifically.     

中央广播电视大学与中国软件行业协会合作机制研究

高校与行业企业合作开展职业教育是教育领域内一个十分重要的研究课题。本文基于中央广播电视大学近几年与中国软件行业协会的合作实践,深入分析了合作双方的优势、合作原则、合作模式以及合作成果,最后提出了合作过程中存在的问题和解决思路,对于探索高校与行业企业的合作有积极的意义。     

Kinematics, pattern recognition, and motion control of mask-panel alignment system

Kinematics, pattern recognition, and motion control methods are investigated as an integrated approach for a mask-panel visual alignment system, which consists of the vision system to extract the mask-panel misalignment and the stage control system to compensate for it. First, a 4PPR alignment mechanism is considered and the inverse kinematic solution is found out to define the relationship between the mask-panel misalignment and the displacements of active joints. Then, a fast alignment mark recognition algorithm is proposed in terms of the geometric template matching (GTM), which is specific to simply shaped patterns but computationally much efficient compared with general correlation-based matchings. Finally, the kinematic solution and the developed vision algorithm are incorporated to implement a two-stage position-based visual servo, where both original fine images and reduced coarse ones are utilized together and the GTM plays a crucial role in achieving a near real-time visual feedback. Experimental results are shown to demonstrate the effectiveness of the GTM-based two-stage alignment control.     

安全结构化对等网络的节点信誉管理机制

提出一种安全结构化对等网络的节点信誉管理机制。使用全局储存方式保存信誉度信息,将文件信誉与节点信誉相结合,避免恶意节点通过修改标识符伪装友好节点的行为。对文件共享系统中的基本操作过程进行分析。在各种节点行为下进行模拟实验,结果证明了该信誉管理机制的有效性。