Software release management for component‐based software

Software release management is the process through which software is made available to and obtained by its users. Until now, this process has been relatively straightforward. However, the emergence of component‐based software is complicating software release management. Increasingly, software is constructed via the assembly of pre‐existing, independently produced, and independently released components. Both developers and users of such software are affected by these complications. Developers need to accurately document the complex and changing dependencies among the components constituting the software. Users must be involved in locating, retrieving, and assembling components in order to appropriately bring the software into their particular environment. In this paper, we introduce the problem of release management for component‐based software and discuss SRM, a prototype software release management tool we have developed that supports both developers and users in the software release management process. Copyright © 2002 John Wiley & Sons, Ltd.     

Mapping of Sahelian vegetation parameters from ERS scatterometer data with an evolution strategies algorithm

The West African Sahel rainfall regime is known for its spatio-temporal variability at different scales which has a strong impact on vegetation development. This study presents results of the combined use of a simple water balance model, a radiative transfer model and ERS scatterometer data to produce map of vegetation biomass and thus vegetation cover at a spatial resolution of 25 km. The backscattering coefficient measured by spaceborne wind scatterometers over Sahel shows a marked seasonality linked to the drastic changes of both soil and vegetation dielectric properties associated to the alternating dry and wet seasons. For lack of a direct observation, METEOSAT rainfall estimates are used to calculate temporal series of soil moisture with the help of a water balance model. This a priori information is used as input of the radiative transfer model that simulates the interaction between the radar wave and the surface components (soil and vegetation). Then, an inversion algorithm is applied to retrieve vegetation aerial mass from the ERS scatterometer data. Because of the nonlinear feature of the inverse problem to be solved, the inversion is performed using a global stochastic nonlinear inversion method. A good agreement is obtained between the inverse solutions and independent field measurements with mean and standard deviation of −54 and 130 kg of dry matter by hectare (kg DM/ha), respectively. The algorithm is then applied to a 350,000 km² area including the Malian Gourma and Seno region and a Sahelian part of Burkina Faso during two contrasted seasons (1999 and 2000). At the considered resolution, the obtained herbaceous mass maps show a global qualitative consistency (r²=0.71) with NDVI images acquired by the VEGETATION instrument.     

Improved estimation of defocus blur and spatial shifts in spatial domain: a homotopy-based approach

This paper presents a homotopy-based algorithm for the recovery of depth cues in the spatial domain. The algorithm specifically deals with defocus blur and spatial shifts, that is 2D motion, stereo disparities and/or zooming disparities. These cues are estimated from two images of the same scene acquired by a camera evolving in time and/or space. We show that they can be simultaneously computed by resolving a system of equations using a homotopy method. The proposed algorithm is tested using synthetic and real images. The results confirm that the use of a homotopy method leads to a dense and accurate estimation of depth cues. This approach has been integrated into an application for relief estimation from remotely sensed images.     

系统生存性分析与需求定义

通过对计算机分布式系统安全问题的介绍 ,提出了生存性的概念 ,并对其进行了分析 ,给出了生存性的定义。生存性的着重点在于当系统受到攻击 ,甚至已被成功入侵的情况下保护关键性服务。     

狄利克雷积分的几种计算方法

利用含参量非正常积分的一些性质,给出了狄利克雷积分integral from n=0 to +∞(sinx)的几种计算方法。     

一种矢量控制型变频器的设计方案介绍

对美国A B公司生产的 1336IMPACT变频器进行了深入研究 ,剖析了该型号变频器的矢量控制算法、参数自整定方法和无速度传感器运行方式下的参数辨识方法等细节问题 ,并在此基础上总结出了系统的控制方案和设计思想 ,得到了详细的控制系统结构     

基于EDA9011的工频交流电参数测量仪

采用EDA90 11单相电参数数据采集模块 ,以单片机为核心设计一种参数智能测试仪 ,该测试仪可实现对工频交流电路的电流、电压的真有效值及有功功率、无功功率、功率因数及累计电量等电参数的数据采集     

多机容错操作系统DFTOS的设计与实现

本文介绍了一个适于三模冗余容错计算机系统的系统管理软件ＤＦＴＯＳ，它是一个多机容错操作系统，具有分布处理和容错计算功能，并且与用户具有良好的接口关系，方便用户对系统的使用和开发。     

机床主轴部件刚度的一种精确的计算方法

将初参数法与优化方法相结合，提出了阶梯主轴部件刚度的计算方法．这一方法很适合在计算机上对多支承主轴的刚度作精确计算．     

工业规模气体渗硼工艺的研究

较系统地研究了ＢＣｌ３浓度、气体流速、温度和时间等工艺参数对渗硼效果的影响规律。优选出在ＢＣｌ３用量比国内外文献介绍的用量低得多的情况下，仍可获得高质量渗硼层的气体渗硼工艺。