Parallel variable metric algorithms for unconstrained optimization

We classify Straeter's ideas for parallel unconstrained optimization and apply them to Huang's class of updating formulas. Straeter's rank-one updating formula appears to be the only parallel extension within Huang's class with the property of quadratic termination. We also develop a parallel extension of Broyden's (1965) rank-one updating formula and prove quadratic termination. Finally, we present numerical results, obtained by testing the algorithms on several standard example problems.     

Backprojection by Multiorientation Simultaneous Computation Scheme for CT Image Reconstruction

1IntroductionIncommercialComputerizedTomographic(CT)imagingsystems,thefilteredorconvolvedbackprojectionalgorithm['J--['tiscurrentlyusedforimagereconstruction.Itingeniouslyseparatesthereconstructionprocedureintotwosteps:theprojectiondataarelinearlyconvolve…     

基于视觉误差准则的矢量量化编码

传统矢量量化编码一般采用绝对误差为误差度量准则，并不符合人类视知觉的特性，本文根据人的视觉感知规律，定义了一种可广泛用于图象编码的视觉误差准则，由此导出了一种新的矢量量化编码方法，实验表明，采用这种方法得到的解码图象在视觉效果比传统方法有较大改善。     

A parallel algorithm for solving the linear complementarity problem

The concept of multitasking mathematical programs is discussed, and an application of multitasking to the multiple-cost-row linear programming problem is considered. Based on this, an algorithm for solving the Linear Complementarity Problem (LCP) in parallel is presented. A variety of computational results are presented using this multitasking approach on the CRAY X-MP/48. These results were obtained for randomly generated LCP's where thenxn dense matrixM has no special properties (hence, the problem is NP-hard). based on these results, an average time performance ofO(n ⁴) is observed.     

METHOD FOR ALONG-TRACK DUAL-ANTENNA AIRBORNE RADAR''''S GMTI WHEN THE ATENNA ERROR CHANGES PULSE TO PULSE

IntroductionIn recent years the key methods for the airborne radar's Ground Moving Target Indi-cation(GMTI) are Space Time Adaptive Processing (STAP)[1], Synthetic Aperture Radar-Moving Target Indication (SAR-MTI)[2], direct data domain method[3], and so on. Thecharacteristics of the methods are different, STAP needs some space and time degrees offreedom, SAR-MTI needs two precisely corrected SAR images, while direct data domainmethod works with data samples from a single range…     

A real-time LPC-based vocal tract area display for voice development

This article reports the design and implementation of a graphical display that presents an approximation to vocal tract area in real time for voiced vowel articulation. The acoustic signal is digitally sampled by the system. From these data a set of reflection coefficients is derived using linear predictive coding. A matrix of area coefficients is then determined that approximates the vocal tract area of the user. From this information a graphical display is then generated. The complete cycle of analysis and display is repeated at ≈20 times/s. Synchronised audio and visual sequences can be recorded and used as dynamic targets for articulatory development. Use of the system is illustrated by diagrams of system output for spoken cardinal vowels and for vowels sung in a trained and untrained style     

双歧酸奶的保健机理及生产工艺

从微生态学及临床医学的角度综合论述了双歧酸奶对人体保健功能的机理，并对双歧酸奶生产工艺中诸如双歧因子的选择等几个关键问题进行了探讨。     

斯特林制冷机薄壁气缸加工工艺研究

主要叙述斯特林制冷机中薄壁气缸的加工的工艺方法,加工过程的关键参数、刀具的选择、热处理的方法。提出薄壁件加工精度的技术途径。     

密立根油滴实验数据处理系统设计

用VB6．0设计了密立根油滴数据处理系统,通过VB内部程序操纵Excel应用程序,运用ActiveX技术调用Excel,解决实验数据计算量大,计算过程繁琐复杂的问题,从而提高了实验效率。     

Flat map areal topography in Macaca mulatta based on combined MRI and histology

Flattened representations are a useful approach to represent the convoluted complex surface of the neocortex of primates and other large-brained mammals. In this study, we compared the flattened representation of neocortical areas obtained from the recently published MRI and histology atlas of the rhesus monkey brain (Saleem KS, Logothetis NK. A combined MRI and histology atlas of the rhesus monkey brain in stereotaxic coordinates. London: Academic; 2007) with other previously published maps. Our results confirm that flat map representations are advantageous due to their ease of use and that current flat maps are well comparable to each other. Some differences arise due to different distinguishing criteria and here too flat maps can help to reveal them.