A palmer-based continuous fuzzy flexible flow-shop scheduling algorithm

 Flexible flow shops can be thought of as generalizations of simple flow shops. In the past, the processing time for each job was usually assumed to be known exactly, but in many real-world applications, processing times may vary dynamically due to human factors or operating faults. In the past, we demonstrated how discrete fuzzy concepts could easily be used in the Palmer algorithm for managing uncertain flexible-flow-shop scheduling. In this paper, we generalize it to continuous fuzzy domains. We use triangular membership functions for flexible flow shops with more than two machine centers to examine processing-time uncertainties and to make scheduling more suitable for real applications. We first use the triangular fuzzy LPT algorithm to allocate jobs, and then use the triangular fuzzy Palmer algorithm to deal with sequencing the tasks. The proposed method thus provides a more flexible way of scheduling jobs than conventional scheduling methods.     

矩形非均匀采样算法和对数级坐标变换算法的比较分析

针对对数极坐标变换引起的图像周边模糊和图像细节丢失等现象，提出了矩形非均匀采样方法。图像中心采样区的大小可根据实际需要进行选取，对其进行均匀采样，对周边区进行分层均匀采样，随距采样中心距离的增大，采样率逐渐降低。对矩形非均匀采样、经典LPT和变参数LPT三者的运算量进行了比较，总体上说，矩形方法具有最少的运算量，而且可以克服对数极坐标变换图像的扭曲，并便于硬件实现。     

Validation of the CATHARE2 code against experimental data from Brayton-cycle plants

In recent years the Commissariat à l’Energie Atomique (CEA) has commissioned a wide range of feasibility studies of future-advanced nuclear reactors, in particular gas-cooled reactors (GCR). The thermohydraulic behaviour of these systems is a key issue for, among other things, the design of the core, the assessment of thermal stresses, and the design of decay heat removal systems. These studies therefore require efficient and reliable simulation tools capable of modelling the whole reactor, including the core, the core vessel, piping, heat exchangers and turbo-machinery. CATHARE2 is a thermal-hydraulic 1D reference safety code developed and extensively validated for the French pressurized water reactors. It has been recently adapted to deal also with gas-cooled reactor applications. In order to validate CATHARE2 for these new applications, CEA has initiated an ambitious long-term experimental program. The foreseen experimental facilities range from small-scale loops for physical correlations, to component technology and system demonstration loops.In the short-term perspective, CATHARE2 is being validated against existing experimental data. And in particular from the German power plants Oberhausen I and II. These facilities have both been operated by the German utility Energie Versorgung Oberhausen (E.V.O.) and their power conversion systems resemble to the high-temperature reactor concepts: Oberhausen I is a 13.75-MWe Brayton-cycle air turbine plant, and Oberhausen II is a 50-MWe Brayton-cycle helium turbine plant. The paper presents these two plants, the adopted CATHARE2 modelling and a comparison between experimental data and code results for both steady state and transient cases.     

基于打印口激光显示系统

针对一般振镜式激光显示系统，文中重点介绍计算机通过打印口对其进行控制的方法，改变以往利用插卡的方式控制操作麻烦的情况，并且阐述该方法在软件上的实现；另外还介绍该系统的组成结构、激光显示的原理。     

多级涡轮三维黏性流场的数值模拟

采用多叶片排网格生成技术，利用实质为标准κ-ω模型的改进型BSL双方程湍流模型对一个四级低压动力涡轮进行了数值模拟，其中多叶片排间参数传递采用“混合平面”方法。通过设计工况下计算结果和设计参数的对比，分析了此型多级涡轮的气动特点。末级导叶正弯优化设计显示弯叶片提高了此型多级涡轮的通流性能，同时也表明了弯叶片优化设计时进行多级黏性流匹配计算的必要性。     

基于AT91SAM7S64的USB/LPT转接系统的固件设计

基于AT91SAM7S64单片机设计并实现USB/LPT转接系统,给出固件设计的相关技术细节.通过该转接系统,使传统LPT接口的设备和仪器可方便地通过USB接口接入到计算机主机系统.     

单片机与PC机并行通讯

串行通讯是单片机与PC机进行通讯所采用的主要通讯方式.但这种方式适应性较差,一般采用较低速度,本文介绍单片机与PC机并行通讯的实现方法.以解决特殊情况下对通讯速度.适应性、可靠性的需求.     

基于自适应极坐标变换的景象匹配算法

对数极坐标投影变换以其对旋转及尺度的不变性而在景象匹配中广泛应用,但这种方法计算复杂且对图像的遮挡非常敏感。自适应极坐标投影变换,一方面保持了对数极坐标投影变换的旋转及尺度不变性,同时对图像间的局部遮挡具有鲁棒性且计算量相对较少。为此,把自适应极坐标投影变换应用到景象匹配中,提出了一种基于自适应极坐标变换的景象匹配算法。结合景象匹配辅助导航系统的实际给出了进一步的改进措施:根据自适应极坐标投影变换的特点,设计了一种新的相似性度量方法;创建虚拟圆索引模板,实现了在基准图上圆形子图的快速截取;在多分辨率匹配技术的基础上,进一步采用跳跃式搜索,有效缩减了匹配耗时。仿真实验表明,所提算法在实时性及鲁棒性方面优于传统的对数极坐标匹配算法。     

图像插值算法在对数极坐标变换中的应用

传统对数极坐标变换算法对图像具有平滑作用,易造成图像细节信息丢失。该文提出将一种基于小波变换的插值算法用于图像对数极坐标映射。该算法对图像作小波变换得到4个子图,并对各子图作对数极坐标变换,其中最优对应像素的确定根据不同子图的特点采用相应的插值算法,对子图映射图作逆小波变换。实验表明该算法是有效的。     

串行D/A转换器MAX538接口技术及应用

介绍了MAXIM公司的串行D／A转换器MAX538与单片机和PC的接口技术。主要内容包括：MAX538和单片机的接口设计要点及应用实例；基于PC并口和LabVIEW的串行通讯模拟软件；多通道模拟量同步调节的实现方案。