An iterative algorithm based on the piecewise linear system for solving bilateral obstacle problems

In this paper, we derive the piecewise linear system (PLS) associated with the bilateral obstacle problem and illustrate the equivalence between the linear system and finite-dimensional complementary problem. The existence and the uniqueness of the solution to the PLS are also demonstrated. Based on the PLS, a Picard iterative algorithm is proposed. The convergence analysis is given and examples are presented to verify the effectiveness of the method.     

Cost efficiency comparison of four video-based techniques for assessing upper arm postures

Many video-based techniques for assessing postures at work have been developed. Choosing the most appropriate technique should be based on an evaluation of different alternatives in terms of their ability to produce posture information at low input costs, i.e. their cost efficiency. This study compared four video-based techniques for assessing upper arm postures, using cost and error data from an investigation on hairdressers. Labour costs associated with the posture assessments from the video recordings were the dominant factor in the cost efficiency comparison. Thus, a work sampling technique associated with relatively large errors appeared, in general, to be the most cost-efficient because it was labour-saving. Measurement bias and other costs than labour cost for posture assessment influenced the ranking and economic evaluation of techniques, as did the applied measurement strategy, i.e. the numbers of video recordings and repeated assessments of them. PRACTITIONER SUMMARY: The cost efficiency of four video-based techniques for assessing upper arm postures was compared. Work sampling techniques were in general more cost efficient than continuous observations since they were labour-saving. Whilst a labour cost dominated the comparison, 'hidden costs', bias and measurement strategy also influenced this dominance.     

大学英语听力自主学习的策略研究

大学英语听力自主学习的产生是适应新时期中国教学情况和社会经济发展的结果。自主学习理论、建构主义理论、二语习得理论和可持续发展学习理论已成为大学英语听力自主学习的理论基础。与大学英语听力自主学习关联度较高并且经常被学生使用的策略包括元认知策略、认知策略和社会情感策略。在今后的大学英语听力自主学习中,从提升学生自我管理能力、构建形成性评估体系和加强课外合作学习出发,培养学生的学习策略。     

钓鱼网站的鉴别方法与防范策略研究

文章从钓鱼网站的种类和传播途径入手,重点分析了钓鱼网站的鉴别方法和防范措施,最后指出了打击钓鱼网站的难度.     

高职学生元认知策略能力调查与英语自主学习能力的培养

通过问卷调查结合教学实践观察,了解高职学生元认知策略能力状况,希望找出高职学生自主学习能力发展的薄弱环节.将收集到的数据用SPSS进行了结构性效度和信度分析后,得出了影响元认知策略能力的4个主要因子,并对每个因子所包含的题项进行了描述性分析,得出结论;针对反映出的问题,提出了相应的教学建议.     

汽包水位温压补偿控制系统研究和应用

对汽包双室平衡容器水位温压补偿控制系统进行了探讨和研究,根据温压补偿模型,分析了P L C系统难以独立实现的原因以及查表法的缺陷,提出了P L C系统与上位机系统相结合的水位温压实时连续补偿的综合控制策略,提出并分析比较了三种体系结构及其实现原理和技术,工程应用结果表明该控制系统提高了水位控制的实时性、稳定性、准确性和安全性。     

不确定性塑胶制品硫化过程的智能控制策略

橡胶制品硫化过程极其复杂，制品性能与诸多不确定性因素有关，产品质量难以控制。针对生产过程中制品质量稳定性问题，剖析了塑胶制品成形过程的特性，研究了硫化过程中采取的控制策略和控制算法，最后探讨了工程实现的相关问题。     

Solaris下综合教务系统的管理和维护

对于Solaris下综合教务系统的管理和维护,本文从系统的优化调整,备份、恢复策略,系统安全保护措施等三个方面进行了探讨。     

实验室服务器规划及其安全策略探讨

阐述了实验室教学管理服务器的规划方法,并总结了服务器系统在安装设置和管理中的一些主要安全策略。     

不同控制策略的小功率Boost-APFC性能研究

为了使用于小功率场合的功率因数校正电路的综合性能最优化,本文研究了采用电流断续模式或临界断续模式和电流连续模式的小功率Boost-APFC的各项性能。通过仿真分析和实验比较相结合的方法,定量给出了各电路在输入电流特性、效率、EMI滤波等性能上的具体差异,并且考虑了使用SiC二极管后对电路性能的影响。