景观是个玩意儿

景观在市场和设计知识分子的价值观之间做怎样的选择？当代设计的尴尬……     

针对作业调度问题的遗传选择算子性能分析

针对作业调度问题,通过变形遗传算法实验,对轮盘赌、随机联赛、随机遍历抽样和确定式采样等选择算子进行了比较分析.以FT06典型车间作业调度问题为实例,比较了这几种常用选择算子在解决车间作业调度问题时的性能优劣程度;从全局收敛性和收敛速度两个方面,分析总结了这些选择算子对算法的全局搜索能力的影响程度.实验结果表明随机遍历抽样算子的整体性能要优于其他几种选择算子.     

暖通设计常见问题与对策

通过对采暖设计中存在的集气、热网水平失调和垂直失调等问题进行分析,及对通风设计中气流组织与风口布置、风管设计和风机选型中存在的一些问题进行分析,总结了一些设计中解决问题的方法。     

有机化学“目标教学—引入问题—启发讨论—归纳总结”四步课堂教学模式探索

我们在多年的有机化学课堂教学中实施＂目标教学—引入问题—启发讨论—归纳总结＂四步课堂教学模式,教学效果良好.     

田子坊历史街区保护与再利用实践中商居混合矛盾的财产 权问题

田子坊的保护和再利用是由普通市民和众多产业个体一起参与的、自下而上的历史街区保护与再利用实践。然而新的利益分配格局也带来了新的矛盾和问题。本研究对田子坊街区保护和再利用的发展中商业与居住混合的状况进行了实证调查,从新制度经济学家巴泽尔(Barzel Y.)和科斯(Coase R.H.)的财产权理论的视角分析和理解田子坊中商居混合产生的困境和矛盾,结论得出田子坊商居混合矛盾的根本原因在于田子坊历史街区保护与再利用的过程中其居住空间财产权的再次划分。因此,对该历史街区中财产权的深入认识可能为解决这一空间利益冲突的问题提供新的契机。     

第二类双边装配线平衡的混合粒子群算法

双边装配线广泛用于汽车、卡车等大型产品的装配过程中。为有效解决第二类双边装配线平衡问题(TALBP-II),提出了一种新的混合粒子群算法(HPSO)。该算法利用粒子群进行全局搜索,使用遗传算法中的交叉算子增强全局搜索,同时利用变邻域搜索进行局部搜索。结合TALBP-II的特点,提出一种解码方式,减少由于操作关系导致的空闲时间。提出工位时间判断策略,缩小搜索空间,提高局部搜索效率。实验结果表明所提出的混合粒子群算法能有效解决第二类双边装配线平衡问题。     

Frequency allocation problem in a SDMA satellite communication system

Spatial Division Multiple Access (SDMA) is a principle of radio resource sharing that relies on the division of the space dimension into separated communication channels. SDMA basically relies on adaptive and dynamic beam-forming associated to a clever algorithm in charge of resource allocation. As satellite communication systems move towards an increasing number of users and a larger throughput for each of them, SDMA is one of the most promising techniques that can reach these two goals. This paper studies static Frequency Assignment Problems (FAP) in a satellite communication system involving a gateway connected to a terrestrial network and some user terminals located in a service area. Two scenarios are considered: one based on SDMA and the other based on usual spot coverage. We propose original integer linear programming formulations and greedy allocation algorithms for the FAP which involves unusual cumulative interference constraints. By considering the link budget of each user, the objective is to maximize the number of users that the system can serve. We show through computational experiments on realistic data that the FAP associated with the SDMA system can be solved efficiently, yielding substantial improvement compared to the traditional system.     

江苏油田试油抽汲卡阻现象的探讨及解决对策

抽汲过程中的卡阻现象在现场施工中经常遇到,本文针对江苏区块试油抽汲施工特点,从原油物性、地层、井筒、工具、设备、人为因素等多个方面进行了综合分析,总结并提出了几项解决对策及建议,可有效地解决并预防了抽汲卡阻情况的发生。     

New Asian Case Method for tribology: a structured approach for increased problem solving competence in tribology teaching and research

Abstract

The gap between academic science/engineering and industry concerning problem solving competencies is addressed in this paper by proposing the New Asian Case Method, an approach inspired by, but substantially different from, the trademark of professional education of the Harvard Business School. The paper puts forward the idea that knowledge in tribology shall be arranged in cases with practical examples that allow students and researchers to learn tribology on real world problems, and obtain a toolbox they subsequently use in their work as tribologists in academia or industry. Micro- and nanotribology are accentuated as high potential role model fields for successful interdisciplinary, inherently application oriented approaches. The New Asian Case Method increases quality approaches in tribology, by structuring the ways of thinking and addressing problems. Establishing the New Asian Case Method in tribology shall set the basis for an international standard in the field.     

Partial Duplication of Response Surface Designs

Continuing the author's earlier work [6] a method is described which requires that certain experimental runs of a central composite, second-order, response surface design be repeated, thereby providing a more general estimate of the experimental error, at the same time providing more reliable estimates of the effects.

The partial duplication of the factorial portion as well as the partial duplication of the star portion has been considered and described. The response surface designs with the star portion duplicated seem to have more potential than the designs with their factorial portions duplicated or partially duplicated.