A New Method for Image Input in Internetbased Telerobotic Control System

Camera-card method is a classical image input method in lnternet-based telerobotic control system. However, there are some disadvantages like high-cost and complicated application in the classical method.Based on TWAIN criterion, a new single USB camera method is proposed in this paper. This method has been implemented by VC＋＋ to drive universal digital image devices like USB camera. Compared to the camera-card method, the proposed method has a lower cost and a more flexible structure in applications such as Intemet-based telerobotic control system.     

Analysis,design,and experimental evaluation of power calculation in digital droop-controlled parallel microgrid inverters

Parallel operation of distributed generation is an important topic for microgrids,which can provide a highly reliable electric supply service and good power quality to end customers when the utility is unavailable.However,there is a well-known limitation:the power sharing accuracy between distributed generators in a parallel operation.Frequency and voltage droop is a well-established control method for improving power sharing performance.In this method,the active and reactive power calculations are used to adjust the frequency and amplitude of the output voltage.This paper describes the digital implementation of a droop method,and analyzes the influence of power calculation on droop method performance.According to the analysis,the performance of droop control in a digital control system is limited by the accuracy and speed of the power calculation method.We propose an improved power calculation method based on p-q theory to improve the performance of the droop control method,and we compare our new method with two traditional power calculation methods.Finally,simulation results and experimental results from a three single-phase 1-kW-inverter system are presented,which validate the performance of our proposed method.     

Ring Delay Chain for Exact Measure of Pulse Cycle Error

This paper introduces a new method named a ring delay chain for exact measure of pulse eycle error.This method can measure a few nanoseconds' error and does not need any high frequency device.Applicationof this method has obtained very good result in a pilot equipment having a servo surface for magnetic diskstorage.     

贝叶斯学习中基于贝叶斯判别分析的先验分布选取

In this paper we propose an experimental method to choose a prior distribution. Different from many re-searchers, who offered lots of principles that separated from sample information, we consider it a Bayesian discrimina-tion problem combining with the sample information. We introduce the concept of Posterior belief about prior distri-butions. With the well-known Bayes theorem we give out a formula to calculate it and propose a method to discrimi-nate a prior between prior distributions-Highest Posterior Belief (HPB). We also show that under certain condition,the HPB method is identical with the ML-Ⅱ method.     

A Fine-Grained Runtime Power/Performance Optimization Method for Processors with Adaptive Pipeline Depth

Recently,a method known as pipeline stage unification (PSU) has been proposed to alleviate the increasing energy consumption problem in modern microprocessors.PSU achieves a high energy efficiency by employing a changeable pipeline depth and its working scheme is eligible for a fine control method.In this paper,we propose a dynamic method to study fine-grained program interval behaviors based on some easy-to-get runtime processor metrics.Using this method to determine the proper PSU configurations during the program execution,we are able to achieve an averaged 13.5% energy-delay-product (EDP) reduction for SPEC CPU2000 integer benchmarks,compared to the baseline processor.This value is only 0.14% larger than the theoretically idealized controlling.Our hardware synthesis result indicates that the proposed method can largely decrease the hardware overhead in both area and delay costs,as compared to a previous program study method which is based on working set signatures.     

Particle swarm optimization for time-optimal control design

In this paper,a particle swarm optimization(PSO)based method is proposed to obtain the time-optimal bang-bang control law for both linear and nonlinear systems.By introducing a penalty function,the method can be modified to deal with systems with constraints.Compared with existing computational methods,the proposed method can be implemented in a straightforward manner.The convergent solutions can be achieved by selecting suitable PSO parameters regardless of the initial guess of the switching times.A double integrator and a third-order nonlinear system are used to demonstrate the effectiveness and robustness of the proposed method.The method is applied to obtain the time-optimal control law for a high performance linear motion positioning system.The results show the practicality of the proposed algorithm.     

A Parameterization Method from Conic Spline Interpolation

Interpolating a set of planar points is a common problem in CAD. Most constructions of interpolation functions are based on the parameters at the sample points. Assigning parameters to all sample points is a vital step before constructing interpolation functions. The most widely used parameterization method is accumulative chord length parameterization. In this paper, we give out a better method based on the interpolation of conics. Based on this method, a sequence of fairer Hermite curves can be constructed.     

A study on Waveley Data Compression of a Real—Time Monitoring System for Large Hydraulic Machines

The general concept of data compression consists in removing the redundancy existing in data to find a more compact representation.This paper is concerned with a new method of compression using the second generation wavelets based on the lifting scheme,which is a simple but powerful wavelet construction method .It has been proved by its successful application to a real-time monitoring system of large hydraulic machines that it is a promising compression method.     

An Evaluation Method for Distortion Energy Parameterization of Triangular Meshes

Parameterization of triangle meshes is a fundamental problem for texture mapping, surface fitting, surface reconstruction, and mesh editing. The deformation of triangular meshes caused by the parameterized process is the measurement of parameterization Traditional standard method has its limitation when evaluating mixture distortion energy parameterizations. Thus an evaluation method bases on distortion energy parameterization of triangular meshes is introduced for the limitation. The novel method employs an adaptive expression form to the mixture energy, and uses a weight factor to represent distortion energy distribution. By using this method, we can evaluate all kinds ofparameterization in a uniform measurement and acquire a more intuitive and clear evaluation.     

A new similarity computing method based on concept similarity in Chinese text processing

The paper proposes a new text similarity computing method based on concept similarity in Chinese text processing. The new method converts text to words vector space model at first, and then splits words into a set of concepts. Through computing the inner products between concepts, it obtains the similarity between words. The new method computes the similarity of text based on the similarity of words at last. The contributions of the paper include： 1） propose a new computing formula between words; 2） propose a new text similarity computing method based on words similarity; 3） successfully use the method in the application of similarity computing of WEB news; and 4） prove the validity of the method through extensive experiments.     

Vague集向Fuzzy集转化的一种新方法

提出Vague值向Fuzzy值转化的实用方法的定义。针对文献[6]中的一个Vague值向Fuzzy值转化的均值修正法,提出了加权均值修正法,并证明了这种方法同样是Vague值向Fuzzy转化的一种非常实用的方法。     

一种抑制EMD端点效应的改进方法

经验模式分解(EMD)存在的端点效应问题影响着该方法的应用。本文研究了基于端点优化对称延拓和镜像延拓的抑制EMD端点效应的改进方法,避免了单独采用端点优化对称延拓法在预测的点数较多时会造成速度较慢,以及单独采用镜像延拓法在处理端点不是极值点的短时间序列时效果不佳的问题。首先利用端点优化对称延拓法对数据序列两端各延拓一个局部极值,获取最佳的信号端点值,然后利用镜像延拓法把镜内的信号映射成一个不存在端点的环形信号,再进行经验模式分解。通过对仿真信号分析,表明该方法能够有效抑制端点效应问题。     

Development and evaluation of the problem identification picture cards method

In this paper the development and assessment of a new formative evaluation method called the problem identification picture cards (PIPC) method is described. This method enables young children to express both usability and fun problems while playing a computer game. The method combines the traditional thinking-aloud method with picture cards that children can place in a box to indicate that there is a certain type of problem. An experiment to assess this method shows that children may express more problems (verbally, or with a picture card, or with a combination of a picture card and a verbalisation) with the PIPC method than without this method (in which they can only indicate problems verbally). Children in the experiment did not just replace verbalisations by using the provided picture cards and some children preferred to use the PIPC method during the test instead of the standard thinking-aloud method. The PIPC method or some aspects of the method could be a good instrument to increase the amount of information expressed by young children during an evaluation.     

基于遗传算法的K均值聚类分析

1 前言聚类分析就是将数据对象分组成为多个类或簇,在同一个簇中的对象之间具有较高的相似度,而不同的簇中的对象差别较大。聚类分析目前应用广泛,已经成为数据挖掘主要的研究领域。通过聚类,人们能够识别密集的和稀疏的区域,从而发现数据的整体分布模式,还能找到数据间的有趣的相互关系。关于聚类分析目前已经有K均值,CURE等很多算法,     

离散事件动态系统性能评估的改进标准钟方法

标准钟（SC）方法是求解离散事件动态系统（DEDS）性能评估问题的十分有效的 仿真手段． 文中在SC的基础上提出了一种新的仿真算法——改进标准钟方法（ISC）．ISC 方法是一种和减小方差技术（VRT）中的条件期望法紧密结合的仿真算法，其算法中去掉了S C方法中的核心概念——标准钟．和SC方法相比，ISC方法不但具有更小的计算负担，而且还 具有更好的评估精度．文末给出的各种算例，均验证了ISC方法的有效性．     

基于逆向Shear-Warp和边缘体素的快速重建算法

医学图像表面重建是协助医生对人体内部病变做出准确诊断的重要手段,而重建的速度直接影响医生的工作效率。为加快重建的速度,提出一种基于逆向Shear-Warp和边缘体素的快速重建算法。采取逆向Shear-Warp方法,减少了不必要的数据处理;通过在完全相反的两个方向上提取边缘体数据,得到全部的表面体素,重复利用这些体数据,而不必每次重新遍历整个数据场,提高了边缘体素的利用效率,达到了快速重建的目的。     

A Prefix Code Matching Parallel Load-Balancing Method for Solution-Adaptive Unstructured Finite Element Graphs on Distributed Memory Multicomputers

In this paper, we propose a prefix code matching parallel load-balancing method (PCMPLB) to efficiently deal with the load imbalance of solution-adaptive finite element application programs on distributed memory multicomputers. The main idea of the PCMPLB method is first to construct a prefix code tree for processors. Based on the prefix code tree, a schedule for performing load transfer among processors can be determined by concurrently and recursively dividing the tree into two subtrees and finding a maximum matching for processors in the two subtrees until the leaves of the prefix code tree are reached. We have implemented the PCMPLB method on an SP2 parallel machine and compared its performance with two load-balancing methods, the directed diffusion method and the multilevel diffusion method, and five mapping methods, the AE/ORB method, the AE/MC method, the MLkP method, the PARTY library method, and the JOSTLE-MS method. An unstructured finite element graph Truss was used as a test sample. During the execution, Truss was refined five times. Three criteria, the execution time of mapping/load-balancing methods, the execution time of an application program under different mapping/load-balancing methods, and the speedups achieved by mapping/load-balancing methods for an application program, are used for the performance evaluation. The experimental results show that (1) if a mapping method is used for the initial partitioning and this mapping method or a load-balancing method is used in each refinement, the execution time of an application program under a load-balancing method is less than that of the mapping method. (2) The execution time of an application program under the PCMPLB method is less than that of the directed diffusion method and the multilevel diffusion method.     

A New Method for Image Input in Internet-based Telerobotic Control System

1 Introduction Network robot, also named Internet- based telerobot , this technology is enjoying wider and wider application in a large variety of fields for its safety in handling, cost- effectiveness and great convenience in operation. It also plays an impetus role in lowering cost and labor in- tensity, raising productivity and accelerating the integra- tion, coordination process in the large- scale modern production. With its significant potential for economic profits, the Internet- based…     

网络机器人控制系统图像摄入的新方法

摄像机—图像采集卡方法是网络机器人控制系统图像摄入的经典方式。然而,这种方法存在着成本偏高、应用不灵活等的弊端。本文基于TWAIN技术规范提出了一种新的独立USB摄像头方法,该方法在VC++环境下实现驱动通用数字图像设备USB摄像头,与经典方法相比,本方法在应用于诸如基于网络的遥操作机器人控制系统中实现了低成本、应用灵活。     

图像分割算法研究

图像分割是数字图像处理中的关键技术之一,研究了边缘检测和阈值分割方法实现图象分割。归纳总结了多种分割算法,包括极小值法,求导法,直方图变换法,迭代法,平均法,大律法和边缘检测法。