Optimum allocation of FACTS devices in Fars Regional Electric Network using genetic algorithm based goal attainment

This paper presents a novel approach to find optimum locations and capacity of flexible alternating current transmission system （FACTS） devices in a power system using a multi-objective optimization function. Thyristor controlled series compensators （TCSCs） and static var compensators （SVCs） are the utilized FACTS devices. Our objectives are active power loss reduction, newly introduced FACTS devices cost reduction, voltage deviation reduction, and increase on the robustness of the security margin against voltage collapse. The operational and controlling constraints, as well as load constraints, were considered in the optimum allocation. A goal attainment method based on the genetic algorithm （GA） was used to approach the global optimum. The estimated annual load profile was utilized in a sequential quadratic programming （SQP） optimization sub-problem to the optimum siting and sizing of FACTS devices. Fars Regional Electric Network was selected as a practical system to validate the performance and effectiveness of the proposed method. The entire investment of the FACTS devices was paid offand an additional 2.4% savings was made. The cost reduction of peak point power generation implies that power plant expansion can be postponed.     

对普通高校体育教学目标的研究

针对在普通高校体育教学改革中存在的体育教学目标、学校体育目标和学校教育目标相混淆的现象，从课程管理的角度出发，从分析影响体育教学目标确认的主要因素入手，提出体育教学目标最终应落脚于身体素质类、技术与技能类和体育知识类之上，并就教学过程中如何把握人文性教化与终身体育思想进行了初步探讨。     

2002年中国男篮3分球的进攻能力的研究

运用文献资料法、数理统计法、观察法和逻辑法,对中国男篮3分球的个人进攻能力、各位置的进攻能力和全队进攻能力进行了分析,指出中国男篮的3分球进攻能力不强,并提出了建议。     

目标的窘困与意义的迷失——对女性主义及其文学的反思

本文认为妇女为争取更大的生存空间和思想自由的努力,并非必须从过分专注地言说“性”开始,女性主义及其文学对现存的性观念的反叛在消解和对抗男性中心主义文化的同时,也有意地忽略了文明的一些基本规范和根本精神。在市场经济社会里,这种言说和反叛还会被消费主义所利用,为“欲望的狂欢”提供舞台,这样最终导致了女性主义及其文学在目标上的窘困和意义上的迷失。     

Exploring the links between students' engagement in cooperative learning, their goal preferences and appraisals of instructional conditions in the classroom

Previous research suggested that social support, belongingness and mastery goals were related to the quality of cooperative learning (CL). In this in-depth study we explored how to differentiate between four effective CL teams and four ineffective CL teams, in terms of students' goals and perceptions of instructional conditions. Apart from the earlier mentioned goals we found students' preference for social responsibility, learning for a certificate and entertainment goals to be salient in the CL setting. Mastery and social responsibility goals were prevalent in effective teams, while learning for a certificate and entertainment goals were prevalent in ineffective teams. Moreover, the type of task, group composition and teacher support were mentioned as reasons for effective or ineffective CL.     

Goal Programming for Investment Portfolio and Its Application

To solve the problem of investment portfolio with single goal of maximal NPV, a 0- 1 programming model was proposed and proved effective; and to solve that concerning more elements of a project such as risk level and social benefit, a goal programming model is then introduced. The latter is a linear programming model adopting slack variable called deviation variable to turn inequation constraint into equation constraint, introducing a priority factor to denote different importance of the goals. A case study has demonstrated that this goal programming model can give different results according to different priority requirement of each objective.     

水平考试与选拔考试的相关问题研究——多元评价中制定考试评价标准研究

新课程改革明确要求构建多元化的评价体系,制定考试评价标准是对多元评价体系的完善。借鉴国外考试评价标准事例,概括根据我国新的课程标准制定考试评价标准的依据和原则,简述考试评价标准的基本框架,说明测量目标表述的基本要求。     

税制改革探讨

我国已进入新一轮税制改革周期,各种税改方案陆续出台,特别是个人所得税改革方案引起社会广泛关注。探讨税制改革的背景、原则、目标、主要内容,对加强税收征管,减少税收流失,完善公共财政体制是十分有益的。     

Students’ and teachers’ perceptions of goal structures – Will they ever converge? Exploring changes in student-teacher agreement and reciprocal relations to self-concept and achievement

Previous studies have shown that alignment between teachers’ and students’ perceptions of goal structures (i.e., student-teacher agreement) ranges from non-existent to, at most, moderate. However, existing work is limited in that it all relies on cross-sectional data, meaning that we lack an understanding of changes in student-teacher agreement on goal structures over time. The present study therefore (a) attempts to shed light on changes over one semester in student-teacher agreement on six dimensions of goal structures (task, autonomy, recognition, grouping, evaluation, and time) in mathematics classes. In addition, we address the question (b) whether differentiated developmental trajectories of student-teacher agreement emerge for the period before vs. after the first mathematics test in the semester. Furthermore, the study (c) examines whether and how students’ self-concept and indicators of students’ initial and actual achievement are (reciprocally) related to agreement and changes in agreement. Data for this study was collected at five measurement points in newly assembled classes (Grade 9) after a transition within secondary education. The sample contained 130 students and their mathematics teachers, resulting in 130 student-teacher dyads. Applying piecewise growth curve modeling indicated changes in agreement regarding recognition, evaluation, and time. Higher increases in self-concept before the test forecasted declines in agreement regarding autonomy after the test. Moreover, we found effects of achievement on changes in agreement for the dimensions of autonomy, evaluation and time. To conclude, the study’s findings support a dynamic view of student-teacher agreement on several dimensions and provide insights into the interplay between changes in agreement, self-concept, and achievement.     

包头市地下水－地表水联合调度多目标管理模型

运用管理模型对地下水和地表水资源优化调度，解决包头市水资源短缺问题。首先建立双层含水层地下水流数值模拟模型，并求得地下水系统单位脉冲响应函数。考虑水资源与社会、经济和环境的关系，构建地下水－地表水联合调度多目标管理模型。决策变量为潜水和承压水开采量、各地表水厂向各管理子区的供水量，主要目标为最大限度完成工业总产值、供水费用最小、最优控制地下水位和尽量满足农业灌溉用水。模型归结为求解线性目标规划问题。结果表明，优化总供水量为66638.9?104m3?a-1，其中地下水供水量为13506.2?104m3?a-1；优化方案最大限度地满足规划需水量，使有限的水资源发挥最大的经济效益；通过对地下水开采量的控制，地下水流场趋于合理。最后根据优化方案提出了宏观水资源管理对策。