Decision Support for DCs Location and Distribute Range Planning: Case Study in Asia-Pacific Region

A major concern is to locate manufacturing plants and/or distribution centers to serve the needs of consumers widely and rapidly with reasonably distributive cost and flexible delivery time. The purpose of this research is to help enhance a decision support for three distribution center locations with different ranges of area in order that the distributors are able to serve appropriately the retailers in twelve large cities or capitals of the nine countries in Asia-Pacific region. The researcher applies the theory of supply chain and logistics management systems with Excel, Visual Basic and Genetic Algorithms programs to find the research results. The research results revealed that the interfaces of Excel, Visual Basic, and Genetic Algorithms programs helped decision support in distribution range selection for 3 distribution center locations. Each of which had different ranges of area for distribution with a rapidly, flexibly distributed time. However, variables resulting in a decision-making should be adjusted under certain circumstances for more reliable, specific needs.     

Near-field optics and control of photonic crystals

We discuss recent progress and the exciting potential of scanning probe microscopy methods for the characterization and control of photonic crystals. We demonstrate that scanning near-field optical microscopy can be used to characterize the performance of photonic crystal device components on the sub-wavelength scale. In addition, we propose scanning probe techniques for realizing local, low-loss tuning of photonic crystal resonances, based on the frequency shifts that high-index nanoscopic probes can induce. Finally, we discuss prospects for on-demand spontaneous emission control. We demonstrate theoretically that photonic crystal membranes induce large variations in spontaneous emission rate over length scales of 50 nm that can be probed by single light sources, or nanoscopic ensembles of light sources attached to the end of a scanning probe.     

任意导体与线天线连接问题的MoM分析

对线天线与导体的连接问题进行了矩量法分析，并提出了奇异城分离法，很好地解决了某些矩阵单元积分奇异性的问题。该方法适用于任意形状线天线与任意形状导体的表面、棱边或者顶点相连的情形，且所占内存少、精度高。数值实例表明了此方法的有效性。     

Exact stability regions for quartic polynomials

Given an arbitrary real quartic polynomial, we find the exact region containing the coefficients of the polynomial such that all roots have absolute values less than 1.     

Sampled grating distributed feedback (SG DFB) semiconductor laser diode

A laser diode was designed using a method called sampled grating (SG) distributed feedback (DFB), in which the couplings have been distributed in certain regions along the laser cavity (i.e., regions contain grating). These regions play a big role in pushing the main mode to propagate faster than the side mode by increasing the time delay between them. This delay is due to the empty regions (i.e., regions without grating) along the laser cavity. Neither a phase shift nor incomplete grating have been taken into account with the new structure. The theoretical model in the present work is based on the coupled-mode equations which have been solved numerically by the mean of transfer matrix method (TMM).     

用于非光滑优化的信赖域算法的一个实施方案

本给出了处理无约束非光滑优化的信赖域算法的一个实施方案。数值实验表明：这种方案是切实可行和可靠的。     

单面加热矩形通道热入口段层流对流换热特性的场协同分析

对单面加热矩形通道热入口段的层流对流换热问题进行了数值模拟研究,给出了不同截面比的局部努赛尔数。推导出单面加热时的场协同方程,以此分析了不同截面比下加热边界条件对努赛尔数的影响规律。     

基于锥模型的一般信赖域算法收敛性分析

本文给出了锥模型信赖域算法的一般模型，它不仅包含通常的信赖域算法一相当于锥模型算法中bk＝0的情形，而且文献[1]的算法也可看作其子类．我们研究这个模型的较强的全局收敛性，并讨论保证算法具有超线性收敛速率的条件，从而推广了文[1]和文[4]中的若干结果．     

时域近场测量的间接频域算法和直接时域算法研究

时域近远场变换是时域近场天线测量的关键技术。本文对时域近远场变换的间接频域算法和直接时域算法进行了数值模拟和分析。针对开口矩形波导天线的时域近场测量 ,选取时空采样参数和内插公式 ,用两种算法计算时域远场方向图 ,分析周期性、时域混叠问题和扫描面截断效应 ,在相互比较和验证的基础上 ,指出两者的优、缺点及适用的情况。     

850 nm有源区无铝高功率SCH-SQW激光器

设计并制作了条宽 10 0 μm ,腔长 1mm的有源区无铝高功率SCH SQW激光器 ,室温连续输出功率达 1W ,阈值电流密度为 46 0A/cm2 ,外微分量子效率为 0 6 8W/A ,激射波长为 849nm(腔面未镀膜 )。