GuideME: Slice‐guided Semiautomatic Multivariate Exploration of Volumes

Multivariate volume visualization is important for many applications including petroleum exploration and medicine. State‐of‐the‐art tools allow users to interactively explore volumes with multiple linked parameter‐space views. However, interactions in the parameter space using trial‐and‐error may be unintuitive and time consuming. Furthermore, switching between different views may be distracting. In this paper, we propose GuideME: a novel slice‐guided semiautomatic multivariate volume exploration approach. Specifically, the approach comprises four stages: attribute inspection, guided uncertainty‐aware lasso creation, automated feature extraction and optional spatial fine tuning and visualization. Throughout the exploration process, the user does not need to interact with the parameter views at all and examples of complex real‐world data demonstrate the usefulness, efficiency and ease‐of‐use of our method.     

RBF Volume Ray Casting on Multicore and Manycore CPUs

Modern supercomputers enable increasingly large N‐body simulations using unstructured point data. The structures implied by these points can be reconstructed implicitly. Direct volume rendering of radial basis function (RBF) kernels in domain‐space offers flexible classification and robust feature reconstruction, but achieving performant RBF volume rendering remains a challenge for existing methods on both CPUs and accelerators. In this paper, we present a fast CPU method for direct volume rendering of particle data with RBF kernels. We propose a novel two‐pass algorithm: first sampling the RBF field using coherent bounding hierarchy traversal, then subsequently integrating samples along ray segments. Our approach performs interactively for a range of data sets from molecular dynamics and astrophysics up to 82 million particles. It does not rely on level of detail or subsampling, and offers better reconstruction quality than structured volume rendering of the same data, exhibiting comparable performance and requiring no additional preprocessing or memory footprint other than the BVH. Lastly, our technique enables multi‐field, multi‐material classification of particle data, providing better insight and analysis.     

农村10 kV配电线路高频信道特性测试及分析

利用中压电力线实现高速数据通信,目前在国内尚属一项空白。如果能够充分运用农村高覆盖率的中压配电网,进行远距离PLC高速通信,将推进农村信息化建设和开创电力工业新的经济增长点。文章对中压(10 kV)配电线路的高频信道特性进行了测试研究,并以河北省某乡一座35 kV变电站的10 kV出线为测试对象,自行搭建测试系统,进行了噪声特性、衰减特性、阻抗特性方面的测试,掌握了相应数据资料。笔者通过分析,提出了选用2~12 MHz作为实现中压PLC远距离高速数据传输工作频段的建议。     

An efficient algorithm for line and polygon clipping

We present an algorithm for clipping a polygon or a line against a convex polygonal window. The algorithm demonstrates the practicality of various ideas from computational geometry. It spendsO(logp) time on each edge of the clipped polygon, wherep is the number of window edges, while the Sutherland-Hodgman algorithm spendsO(p) time per edge. Theoretical and experimental analyses show that the constants involved are small enough to make the algorithm competitive even for windows with four edges. The algorithm enables image-space clipping against windows whose boundaries are convex spline curves. The paper contains detailed pseudo-code implementation of the algorithm and an adaptation of the simulation of simplicity method for handling degenerate cases.     

2831／2位BCCD模拟延迟线的研制

采用四相埋沟结沟制作了器件,其转移效率超过99.99%,时钟频率超过10MHz。本文阐述了器件原理、结构和工艺以及提高器件参数的重要途径。     

一种基于快速KNFL的模式分类法及其在寂声/语声段识别中的应用

本文提出了一种基于快速K最近特征线(K Negest Feature Line,KNFL)的模式分类法，这种方法可看作是对K最近邻法(KNN)的推广，它以最近特征线(Negest Feature Line,NFL)为基础，先找出距离待识别点最近的K条特征线，再找出这K条特征线中属于某一类别数目最多的那一类作为识别结果。而在对NFL的搜索中，提出了一种快速的计算方法，使得KNFL计算量大大减少。此外，本文可以把这种算法应用于语音信号的寂声/语声段的识别中。实验结果表明，将KNFL应用于语声段／寂声段的识别会得到良好的效果。     

Fuzzy assembly line balancing using genetic algorithms

In this paper, we implement genetic algorithms to synthesis fuzzy assembly line balancing problem which is well-known as a NP-hard problem. The genetic operators concerned with the feasibility of chromosomes will be discussed, and its performance will be shown with a numerical example.     

关于同轴线最佳尺寸比的讨论

本文对国内外微波技术书籍中公认的同轴线最佳尺寸比提出了异议,并给出了电特性更好的新的最佳尺寸比值。     

PET系统空间线性度的质控测量

运用自制的单线源和多线源，对ＰＥＴ的线性度进行了三维方向的测量，测量中采用了求线分布函数ＬＳＦ峰位相对理想直线偏差的方法，为提高测量精度，对有关函数的峰位进行了三次样条函数插值校正，测量结果较为理想，误差均小于百分之一。     

复杂全自动生产线的控制程序设计方法

在大型复杂的全自动控制生产线中，由于系统的组成和动作流程复杂，PLC软件编制上采用“并行分支与并行接合”和“模块化”程序设计的方法，可大大简化系统程序设计和调试，有效地提高逻辑控制系统的可靠性。