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The permutation flowshop scheduling problem (PFSP) is one of the most well-known and well-studied production scheduling problems with strong industrial background. This paper presents a new hybrid optimization algorithm which combines the strong global search ability of artificial immune system (AIS) with a strong local search ability of extremal optimization (EO) algorithm. The proposed algorithm is applied to a set of benchmark problems with a makespan criterion. Performance of the algorithm is evaluated. Comparison results indicate that this new method is an effective and competitive approach to the PFSP. 相似文献
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本文对对地观测数据支持下的城镇人口估算方法进行了研究。首先,将研究区的居民地划分为高密度区、中密度区和低密度区,并且通过解译IKONOS数据获取各类型居民地的面积;然后,通过线性相关分析,研究居民地面积与居民人口之间的相关关系,并建立了相关关系式;最后,应用训练数据对居民地面积与居民人口之间的关系式进行了检验,结果显示:应用对地观测数据进行城镇人口估算,在理论上可信、方法上可行,是城镇应急状态下进行人口估算的可取方法。 相似文献
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探索式创新和利用式创新对于企业获取持续竞争优势具有显著的驱动作用。企业家导向和学习导向作为企业前瞻进取、以及持续学习的战略倾向,通过不同作用机理对上述两种创新产生差异化的影响。因此,为了探究上述差异化作用机制,以及市场竞争强度对上述关系的影响,论文构建了企业战略导向、技术创新、以及市场竞争的情境影响的概念模型并运用404份企业调研数据加以验证。结果显示:相对于学习导向而言,企业家导向对探索式创新的促进作用更强,对利用式创新的促进作用更弱。竞争强度正向调节企业家导向对探索式创新的促进作用,负向调节学习导向对探索式创新的促进作用。论文的理论探讨和实证检验深化了战略导向的研究,拓展了战略导向与技术创新间关系的理论探讨,对于企业在激烈竞争下发展技术创新具有一定的实践指导意义。 相似文献
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本文拓展了创业导向与绩效关系的经典模型,构建了资源可获得性、创业导向、环境动态性、资源整合能力与新创企业绩效之间的关系模型,通过实证分析验证理论模型及所提出的假设。 相似文献
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Nurcan Kurt 《Journal of The Franklin Institute》2008,345(3):303-317
In this study, an alternative method is presented for the solution of two-dimensional heat equation in a square region. In this method, the solution function of the problem is based on the Green function, and therefore on elliptic functions. The numerical results have been computed for an application example and compared with the results of the well-known method of separation of variables and the finite elements method. The comparison study shows that the present method gives better results than those of the other methods. 相似文献
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本文对对地观测数据支持下的城镇人口估算方法进行了研究。首先,将研究区的居民地划分为高密度区、中密度区和低密度区,并且通过解译IKONOS数据获取各类型居民地的面积;然后,通过线性相关分析,研究居民地面积与居民人口之间的相关关系,并建立了相关关系式;最后,应用训练数据对居民地面积与居民人口之间的关系式进行了检验,结果显示:应用对地观测数据进行城镇人口估算,在理论上可信、方法上可行,是城镇应急状态下进行人口估算的可取方法。 相似文献
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CHEN Min-rong LU Yong-zai YANG Gen-ke 《浙江大学学报(A卷英文版)》2007,8(12):1905-1911
In this paper, we extend a novel unconstrained multiobjective optimization algorithm, so-called multiobjective extremal optimization (MOEO), to solve the constrained multiobjective optimization problems (MOPs). The proposed approach is validated by three constrained benchmark problems and successfully applied to handling three multiobjective engineering design problems reported in literature. Simulation results indicate that the proposed approach is highly competitive with three state-of-the-art multiobjective evolutionary algorithms, i.e., NSGA-II, SPEA2 and PAES. Thus MOEO can be considered a good alternative to solve constrained multiobjective optimization problems. 相似文献
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企业家导向、外部知识获取与自主创新关系研究——基于两种技术差异情景的比较分析 总被引:3,自引:0,他引:3
针对现有研究的不足,建立了企业家导向通过外部知识获取促进企业自主创新过程的研究框架,从理论上分析了不同技术差异条件下企业家导向对外部知识获取的影响,外部知识获取与自主创新的关系,以及不同控制方式对外部知识获取与自主创新之间关系的调节作用. 相似文献
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Nonlinear effect induced in thermally poled glass waveguides 总被引:2,自引:0,他引:2
REN Yi-tao 《浙江大学学报(A卷英文版)》2006,7(1):105-108
INTRODUCTION Because of high transparency of glass to light and the very stable physical properties of glass, waveguides made of it are popular structures and building blocks in optoelectronic applications. Par- ticularly they are often used to fabricate passive components or devices with good compatibility with optical fibers in optical communication. By adopting the technology available in microelectronics, fabri- cation of glass waveguides can be a standard process with mass production,… 相似文献