膜厚类测试仪器的比对

文章介绍了膜厚类测试仪比对方法的设计、比对结果的处理及比对周期的选取等,给出了台阶仪和光谱型膜厚测量仪的实际结果。该方法也适用于其他仪器的比对,并给出了比对中应注意的问题。     

Reply to comments on "An Interval Logic for Real-Time System Specification"

The paper on Comments on "An Interval Logic for Real-Time System Specification" presents some remarks on the comparison examples from TILCO and other logics and some slips on the related examples. This paper gives evidence that such issues have no impact on the validity of the TILCO theory of paper and provides some further clarifications about some aspects of the comparison.     

树比较可视化方法综述

层次数据是生产和生活中常见的一类数据.树可视化通常用于呈现层次数据,是可视分析中的一个重要部分.比较是一种常用的分析方式,而树比较可视化也是可视分析研究中的一个重要课题.树比较可视化从所比较的树的数目角度,分为树内比较、两树比较和多树(3树及以上)比较;从数据特点角度分为静态树比较和动态树比较;从比较分析的任务角度,分为结构比较和属性比较.对现有的树比较可视化方法进行了总结,按照不同方法的表现形式,将树比较可视化分为并置、合并以及动画这3类.同时,结合其他分类方法对树比较可视化方法进行了全面的分析和评估.通过评估和比较,分析了不同方法的优缺点以及在不同的数据分析需求中的适用性.在此基础上,还对树比较可视化中的交互方式进行了总结,并阐述了树比较可视化所面临的挑战.     

一种新的IEEE 802.11自适应速率MAC协议——设计实现与性能测试

首先比较了现有的几种主要的自适应速率协议的特点,并详细阐述了一种新的自适应多速率协议AMARF的原理。其次,基于linux操作系统,通过修改设备驱动程序,在商业无线网卡上实现了ARF和AMARF两种自适应速率算法。最后,在实验室环境下,对各种速率自适应的算法进行了实际的性能测试,测试结果表明：在不同信道环境下,AMARF协议性能较优。     

Convergence for nonnegative double splittings of matrices

In this paper, we investigate a class of iterative methods for solving linear systems. This iterative method is derived by double splittings of coefficient matrices. On the basis of convergence and comparison theorems for single splittings, we present some convergence and comparison theorems for nonnegative double splittings. The results are applied to the Jacobi double SOR method.     

多能源电动汽车中的功率比较控制策略及仿真

在多能源电动汽车的模型基础上，针对能量管理系统(EMS)该文提出了一种功率比较控制策略。EMS的功率比较控制策略是通过比较实际所需功率和能量存储元件的最大提供和吸收功率来达到分配功率的目的。同时提出了最大提供功率和吸收功率的确定方法。仿真结果表明：功率比较控制策略比简单查表控制策略在续驶里程、燃料经济性和效率等方面均有所改善。     

特种设备检验检测仪器设备期间核查方法的探讨

针对特种设备检验检测机构检验员不熟悉测量不确定度评定和计算的情况,提出了留样法、两台比对法及多台设备同比法3种不涉及测量不确定度计算的期间核查方法,用于特种设备检验检测用仪器设备的期间核查,使仪器设备出具的检验数据更具可信度。方法中均使用被核查仪器设备的最大允许误差进行结论判定。通过对游标卡尺采用留样法实施期间核查进行举例分析,可见本文提出的3种方法较为适合特种设备检验检测用仪器设备的期间核查,具有明显的可行性,并可对同类检验检测机构的仪器设备期间核查工作提供借鉴。     

Processing the pairwise comparison matrix by the maximum likelihood method

This paper suggests the method of utility estimation for certain alternatives based on their pairwise comparison. The pairwise comparison matrix being formed is interpreted as the result of a measurement with random errors. Finally, a numerical example is provided to illustrate operation of the method.     

Investigation of stability of nonlinear continuous-discrete models of economic dynamics using vector Lyapunov function. II

In the first part of this paper, procedures for construction of sublinear Lyapunov vector functions and a new type of heterogeneous comparison systems, which allow investigation of different properties of stability and boundedness without discretization of original systems were given for a sufficiently wide class of nonlinear continuous-discrete control systems. In this paper, these comparison systems are used to formulate effectively verified conditions of exponential stability and constructive procedures for analysis of this property with calculation of all quantitative estimates characterizing this property. The application to the investigation of stability of economic growth in the Phillips-Bergstrom model with discrete monetary regulation is made.     

Evaluation of algorithms for one-dimensional cutting

The paper deals with the problem of evaluating and comparing different one-dimensional stock cutting algorithms regarding trim loss. Different types of problems are identified. An evaluation method is developed which enables a comparison of solutions of all types of problems. A practical example of this methods implementation is presented.Scope and purposeThere are many algorithms and methods for one-dimensional stock cutting with different factors that need to be taken into account. Therefore a general comparison between them is very difficult if not impossible. However, if we assume that trim loss is the most important factor common to different methods, we can overcome this problem by limiting the comparison to trim loss. In different cutting stock problems and in different approaches to them trim loss is defined differently. For the comparison of different solutions to be possible, we need to find a common definition to the trim loss. Such a general definition is introduced by the General One-Dimensional Cutting Stock Problem type (G1D-CSP). In this paper, a problem generator algorithm PGEN for G1D-CSP is presented and the method for evaluation and comparison of different one-dimensional cutting stock algorithms is proposed.     

Dynamics and convergence rate of ordinal comparison of stochasticdiscrete-event systems

This paper addresses ordinal comparison in the simulation of discrete-event systems. It examines dynamic behaviors of ordinal comparison in a fairly general framework. It proves that for regenerative systems, the probability of obtaining a desired solution using ordinal comparison approaches converges at exponential rate, while the variances of the performance measures converge at best at rate O(1/t ²), where t is the simulation time. Heuristic arguments are provided to explain that exponential convergence holds for general systems     

Path tracking with quadruped walking machines using discontinuous gaits

Discontinuous gaits for walking machines offer great advantages over wave gaits, and they seem more adequate for following a path over irregular terrain. This paper, focused on quadruped walking robots, addresses the problem of following an arbitrary path using both discontinuous crab and turning gaits. First, the paper presents the algorithms to generate these gaits as local motions and highlights their advantages in comparison with continuous gaits. This comparison considers stability, velocity, power consumption and terrain adaptability. The algorithms for tracking an arbitrary trajectory using these gaits are then introduced, and some simulations and experimental results are reported.     

大系统渐近稳定的向量V函数法

利用分解集结和向量Ｖ函数法解大系统的渐近稳定性问题是一种十分有效的方法，但过去一般限于集结成常系数线性比较方程，得到的只是指数稳定，本文研究了非线性比较方程的构造方程，给出了比较方程稳定性的判定定理，并举例说明其用处。     

汉英翻译系统英文生成中选词模型的设计

本文描述了一种基于实例比较,辅以语义模式匹配的英文选词模型的设计。首先,我们讨论了汉英翻译系统英文生成中选词的重要性,然后比较了几种可能的选词策略并提出我们的选词模型,接着我们较详细地描述了生成词典的结构以及选词算法。文中,我们还简要介绍了我们所使用的语义知识资源——《知网》。     

Convergence and comparison results for double splittings of Hermitian positive definite matrices

Abstract For single splittings of Hermitian positive definite matrices, there are well-known convergence and comparison theorems. This paper gives new convergence and comparison results for double splittings of Hermitian positive definite matrices. Keywords: Hermitian positive definite matrix; convergence theorem; comparison theorem; double splitting Mathematics Subject Classification (2000): 65F10     

Comparing accessibility evaluation tools: a method for tool effectiveness

This paper claims that effectiveness of automatic tools for evaluating web site accessibility has to be itself evaluated, given the increasingly important role that these tools play. The paper presents a comparison method for a pair of tools that takes into account correctness, completeness and specificity in supporting the task of assessing the conformance of a web site with respect to established guidelines. The paper presents data acquired during a case study based on comparing LIFT Machine with Bobby. The data acquired from the case study is used to assess the strengths and weaknesses of the comparison method. The conclusion is that even though there is room for improvement of the method, it is already capable of providing accurate and reliable conclusions.     

Comparing ICP variants on real-world data sets

Many modern sensors used for mapping produce 3D point clouds, which are typically registered together using the iterative closest point (ICP) algorithm. Because ICP has many variants whose performances depend on the environment and the sensor, hundreds of variations have been published. However, no comparison frameworks are available, leading to an arduous selection of an appropriate variant for particular experimental conditions. The first contribution of this paper consists of a protocol that allows for a comparison between ICP variants, taking into account a broad range of inputs. The second contribution is an open-source ICP library, which is fast enough to be usable in multiple real-world applications, while being modular enough to ease comparison of multiple solutions. This paper presents two examples of these field applications. The last contribution is the comparison of two baseline ICP variants using data sets that cover a rich variety of environments. Besides demonstrating the need for improved ICP methods for natural, unstructured and information-deprived environments, these baseline variants also provide a solid basis to which novel solutions could be compared. The combination of our protocol, software, and baseline results demonstrate convincingly how open-source software can push forward the research in mapping and navigation.     

How do people compare themselves with others on social network sites?: The case of Facebook

The social comparison theory and its subsequent studies say that comparing with others can influence an individual in several ways (e.g., evaluation of oneself, influence on self-esteem/self-confidence, and efficient decision making) and people compare with others when they are confronted with information of others. With the popularity of social network sites, many people acquire or are exposed to information of others on social network sites, which implies that people are likely to frequently engage in social comparison behavior on social network sites. The present paper examines social comparison behavior on social network sites (especially on Facebook) using a college students sample. We find that an individual’s personality characteristics (i.e., social comparison orientation, self-esteem, self-uncertainty, and self-consciousness) influence the person’s social comparison frequency on Facebook. A positive relationship between Facebook use intensity and social comparison frequency on Facebook is found. In addition, we find a positive association between social comparison frequency on Facebook and the frequency of having a negative feeling from comparison. Other findings are also reported in the paper.     

Comparison results for fuzzy differential equations

In this paper, we present several comparison results for the solutions of fuzzy differential equations, by using the Hukuhara derivative. These results constitute the extension to the fuzzy context of some comparison results for the solutions of linear differential equations. Besides, some side-results about the Hukuhara difference and the partial orderings are given. We illustrate the applicability of the new results by showing several examples.