A multiobjective hybrid ant colony optimization approach applied to the assignment and scheduling problem

The assignment and scheduling problem is inherently multiobjective. It generally involves multiple conflicting objectives and large and highly complex search spaces. The problem allows the determination of an efficient allocation of a set of limited and shared resources to perform tasks, and an efficient arrangement scheme of a set of tasks over time, while fulfilling spatiotemporal constraints. The main objective is to minimize the project makespan as well as the total cost. Finding a good approximation set is the result of trade‐offs between diversity of solutions and convergence toward the Pareto‐optimal front. It is difficult to achieve such a balance with NP‐hard problems. In this respect, and in order to efficiently explore the search space, a hybrid bidirectional ant‐based approach is proposed in this paper, which is an improvement of a bi‐colony ant‐based approach. Its main characteristic is that it combines a solution construction developed for a more complicated problem with a Pareto‐guided local search engine.     

移动混合开发框架

针对现有混合开发框架在开发便利性和应用性能方面的不足,研究了以HTML5开发为基础的移动混合开发框架的问题.结合HTML5跨平台特性、打包机制、多窗口管理机制、原生插件开发技术等,实现了一套自有的混合开发框架.本混合开发框架为开发带来了便利,提升了开发效率,同时,混合引擎中独特实现的Widget应用管理以及窗口管理模式也改善了混合应用的性能,提升了用户体验.我公司实现的企业级移动解决方案表明该框架性能较好,易于使用,具有较好的商业价值.     

New anion exchanger organic–inorganic hybrid materials and membranes from a copolymerof glycidylmethacrylate and γ‐methacryloxypropyl trimethoxy silane

Organic–inorganic hybrid materials and mem branes were prepared through coating on Teflon plate or dip‐coating on microporous alumina substrates with the solution of glycidylmethacrylate (GMA) and γ‐methacryloxypropyl trimethoxy silane (γ‐MPS) copolymer, followed by ring‐opening of the GMA moiety with trimethylamine hydrochloric and sol–gel reaction of the γ‐MPS moiety. Composition of the GMA and γ‐MPS copolymer was varied by changing the feed ratio of GMA to γ‐MPS during the copolymerization. So the thermal stability, hydrophilicity, electrical properties, etc. of the hybrid materials and membranes were varied. Results showed that as the γ‐MPS amount increased in the copolymer, T_d (the temperature on thermogram at 5% weight loss) value of the hybrid materials and water contact angle of the hybrid membrane generally increased, while the anion exchange capacity, water uptake (W_R) and pure water flux decreased. The charge transition point of the hybrid membranes deduced from their streaming potential behavior decreased from pH > 12 to pH = 7–8 as the γ‐MPS amount increased. © 2006 Wiley Periodicals, Inc. J Appl Polym Sci 102: 3580–3589, 2006     

基于同构多核处理器的任务调度

随着现代应用对计算机性能要求的提高,计算机主频不断提升。由于功耗和半导体工艺的限制,仅靠提高单核主频难以继续维持“摩尔定律”,同构多核处理器（Homogeneous Multi-core）应运而生。在同构多核处理器的支持下,一个芯片汇集多个地位对等、结构相同的通用处理器核,以最小的代价满足了提高系统性能、负载均衡、处理器容错的需要。并行体系结构需要结合与之适应的软件实现性能效益的倍增。本文从操作系统层面,针对处理器结构的变化,研究并实现多核任务调度。系统采用混合调度策略,簇间独立调度,簇内统一调度。从调度模式、调度算法、分配算法、调度时机等方面详细分析了多核调度的原理和实现机制。最后通过模拟实验证明功能正确性及算法可调度性。     

冷却塔修复与改造的技术经济分析

评述辽河化肥厂配套公用工程设施－美国玛利６００型７格塔冷却修复与改造项目的技术经济分析，叙述了该冷却塔现状，并据此拟定出的经济面实效的分期改造方案。     

水性核（PMMA）／壳（PU）聚氨酯丙烯酸酯杂化乳液的合成研究

合成高Tg低成膜温度的水性聚氨酯丙烯酸酯杂化乳液,研究了合成工艺、—N CO和—O H的比例、丙烯酸酯含量等因素对乳液稳定性和其他性能的影响。     

离子膜法烧碱电解系统中螯合树脂塔的模块

阐述了离子膜法烧碱系统中螯合树脂塔的工艺设计和生产中已出现和可能出现的问题,并介绍了解决问题的方法。     

混合遗传算法求解应急抢修点选址问题

考虑设备应急抢修的时限要求和整个应急抢修系统的服务质量要求,采用0-1整数规划模型描述了应急抢修点选址问题,并针对该问题设计了一种混合遗传算法。在算法中使用启发式算法对种群中的不可行解进行修复,以保持种群在可行域内搜索,并采用近邻搜索算法改善种群中的最佳个体。算例计算的结果表明,该算法求得的结果要优于基于罚函数的遗传算法和采用简单修复算法的遗传算法。     

混合蛙跳算法应用研究

混合蛙跳算法（SFLA）是一种模拟青蛙觅食行为的智能优化算法.算法具有设置参数少、简单易于理解、鲁棒性强等特点.由于该算法提出的时间不长,目前对此算法的研究成果并不多,该算法在理论和实践上还不够成熟,如该算法的鲁棒性、收敛性、稳定性等数学理论还未给出完整的数学证明,算法的适用范围目前还仅限于函数优化、组合优化、单目标优化、多目标优化等方面.本文重点分析研究了该算法的基本原理、应用前景、国内外的研究现状和主要研究内容,以及目前该算法研究过程中出现的问题.     

Aromatization of n-butane over new LD-HBS catalysts. Effect of the gallium oxide support

It is shown that even pure quartz, other silicas or aluminas can enhance the aromatization activity of a ZSM-5 zeolite. Incorporation of gallium oxide onto these supports increases further the production of aromatics. The use of supported gallium oxide co-catalyst obtained by co-evaporation of a colloidal silica and a Ga salt has led to extremely high aromatization performance for the hybrid catalyst.