网格操作系统及其关键问题的研究

分析了网格系统的特点，根据网格系统的要求提出了网格支撑中间件——网格操作系统的层次结构，该结构将网格OS划分为核心层、构造模块层和集合模块层。然后根据网格计算和服务的特点对网格OS应该提供的模块和服务进行了研究和探讨，并以Globus Toolkit2．0为实例进行了分析和说明。最后对各模块所处的层次进行了说明并简单介绍了其最新发展。     

LDAP与SNMP网络管理协议的集成

当前的企业管理对网络设备信息的访问必须通过专用的管理协议 (如CMIP ,SNMP)进行 ,因此造成网元的MIB独立于企业目录。为使企业能采用统一的方式管理企业信息库中的各种信息资源 ,则必须实现MIB和企业目录信息树的集成。针对上述问题 ,主要讨论了LDAP与MIB的一种集成方案。     

电影前期拍摄影像数据及现场调色的管理方法研究--以《金刚川》为例

在电影制作数字化转型过程中,负责数字影像流程和影像技术质量控制的DIT(Digital Imaging Technician,数字影像工程师)伴随而生。本文梳理了现阶段常规电影拍摄中DIT的工作内容和管理方法,并介绍了电影《金刚川》在其特定的制作背景下对影像数据及现场调色的管理需求和实现方法,对电影前期拍摄的影像数据和现场调色的管理方法进行总结和展望。     

Adoption of e-book among college students: The perspective of an integrated TAM

This study explored factors that affect consumer acceptance of e-book use by applying a model that incorporates the Technology Acceptance Model (TAM) as the theoretical basis of the hypotheses. The model differentiated external factors—compatibility, relative advantage, self-efficacy, and subjective norms—from internal factors—perceived ease of use, perceived usefulness, satisfaction with e-book usage, and intention to continue using e-books. The study (n = 1030) found statistically significant support for the hypothesized model, indicating that the tested relationships between the revised TAM and user intention to continue using e-books were positive and statistically significant. The study’s findings provide potentially significant implications that can be used to develop guidelines and a framework for assessing e-book users’ behavior.     

基于STM32的音频信号分析设计与实现

基于ARM Cortex-M3内核的32位处理器STM32F103和快速傅里叶变换(FFT)算法实现了音频信号频谱的分析。整个系统由前级信号调理、A/D采样电路、CPU运算电路和LCD显示电路等组成。实验表明,系统能够检测20 Hz¹0 kHz范围内的频率成份并显示音频信号频谱,该方案成本低,具有一定的应用价值。     

A novel method for wave focusing investigation in metamaterial half‐space and slab lens structures

Approximate image currents for the Sommerfeld half‐space problem with vertical electric and magnetic current sources above double negative half‐space is found using the discrete image theory and Laplace transform. This method would found its applications in investigation of dipole radiation above metamaterial half‐space and in describing the focusing mechanism of metamaterial lenses. In order to efficiently consider the effects of metamaterial half‐space, discrete image dipoles are defined by proposing an exponential series for reflection coefficient. Unknown constants (the loci of images) in the argument of the exponential function are determined by equating the coefficients of the Taylor series for exact reflection coefficient with those of the proposed approximate series. Thus, the calculation of integral with oscillating integrand reduces to the solution of polynomial equation for the zeros of polynomials. As an application for the proposed approach, the field focusing in double negative is investigated. Thanks to the fast and accurate methods for finding the zeros of polynomials, it is shown that in addition to its good accuracy, this method decreases the computational time for field calculations in comparison with the exact methods. It is seen that for the negative refractive index beside −1, the complex images approach to infinity and have negligible effect on the scattering field of dipole. For the other negative indexes the complex image blurs the real image. Copyright © 2015 John Wiley & Sons, Ltd.     

一种按时间抽取的混合基实序列高效FFT算法

针对2N点实序列FFT的实现,分析了FFT运算的基本原理,并在基本原理的基础上介绍了一种按时间抽取的混合基FFT算法.此算法采用"包装"算法和基2-基4混合算法结合的方法进行运算.通过复杂度分析,显示了此算法与传统的单一基2或基4的FFT相比,大大减少了计算过程中所需的实加法的个数;当点数大于1024时,所需实乘法的个数也有所减少.这是一种实序列FFT的高效低复杂度算法.     

面向对象软件测试及度量的研究

软件测试方法和度量是提高和保证软件质量的关键,文中介绍了一种认识面向对象软件集成测试和试想量的方法（URI）,以及一种继承树深度（DIT）的度量标准,从这一测试方法显示继承的过多使用将增加软件测试的复杂性,论文最后介绍了有待进一步研究的问题。     

基于信息距离理论的网站“易搜性”测度模型研究

网民使用搜索引擎找到某网站的难易程度是衡量网站价值的重要因素,目前对该因素的评价方法以定性评价为主。本文将信息距离理论运用于网站"易搜性"的研究,提出了网站"易搜性"的定量测度模型。实例研究表明该模型是有效的且可行的。