一种多方法融合的软件成本估算改进方法

对传统的WideBand Delphi估计法、功能点法和类比法进行了分析、比较,提出了一种改进的成本估算方法。该方法以WideBand Delphi估计法为原型,在专家估计过程中,将功能点法和类比法融入其中,有效规避了WideBand Delphi估计法过于依赖专家经验的不足,并通过类比扩展了功能点法所局限的应用领域,既保证了估计方法的科学性,又保证了估计结果的准确性。实际估算数据的比较表明,改进后的估算方法具有更高的精确度。     

新型硅麦克风类比电路的设计与分析

为了快速准确地研究硅麦克风系统行为特征及其耦合过程,实现计算机的辅助设计,需要建立一套新型的硅麦克风类比电路来实现对系统的仿真。结合通用电容式硅麦克风的实际结构,利用线性网络理论和硅麦克风的声力电类比相关原理建立一套新型的硅麦克风类比电路,通过PSPICE电路仿真软件仿真此类比电路,可得到其谐振频率点处于44.008 kHz,并且在声音听阈范围内,频率响应平坦,反应了实际硅麦克风的特性。     

一种改进的重构算法在信道估计中的应用

研究了在多天线正交频分复用系统信道估计问题。特别利用了宽带MIMO-OFDM系统的时域稀疏特性,来研究这个系统中的基于导频符号的信道估计技术。本文将压缩感知理论应用在稀疏信道估计中,对现有的重构算法进行改进,在不需要预先知道信道的稀疏度信息就利用分次迭代,逐步逼近的方法可以精确重构信号。仿真结果表明,本文提出的信道估计方法性能更加良好。     

信号处理课程中时移性质的类比教学

针对信号处理课程中存在的可类比内容,本文探讨类比教学的组织方法,并以时移性质的教学为例展开讨论,其中涉及双边与单边变换中的后移和前移性质。本文推导了拉普拉斯变换、连续信号的傅里叶变换、序列的傅里叶变换和变换四种信号变换中的时域前移性质,整理出可类比内容,给出了时域前移性质类比教学的做法。     

类比教学法在场效应管教学中的应用

类比教学法是教学过程中对类比推理的具体运用。类比教学法让学生由浅入深,学习起来很轻松,并感觉到触类旁通的学习乐趣。文章是在日常教学中,对场效应管教学中涉及到的多个知识点与三极管类比的总结,并归纳得出教学中的类比技巧。     

计算机软件估计技术及未来发展

计算机软件估计对项目的软件规模进行数字上的近似.从而可以制定或更新项目开发计划,指导开发过程,文中对软件估计中常用的技术进行了分析.这些技术包括Wideband Delphi,Pert Sizing以及功能点方法.最后指出了软件估计技术未来发展的趋势.     

COSMIC-FFP模型对大型软件的规模评估

阐述了一种基于传统的IFPUG-FPA方法的演进规模估计模型--COMSIC-FFP模型。分别详细分析了它的软件度量过程模型原理和度量方法:将软件系统转换成为软件功能模型,进而使用度量系统将软件的功能点量化,最终得到表示软件大小的数值表示。这个模型可以使得软件功能点划分的标准更加灵活,对软件内部的结构和实现依赖更小,使得功能过程定义更加细致,其中包含的功能点也更加具体和单一。能够极大提高对复杂大型软件系统规模估计的准确度。     

空战威胁估计系统建模与仿真研究

以空战中飞机受到的威胁为研究目标,根据空战各个威胁单元的特点,分别研究了各单元威胁度的计算方法,并对不同平台的威胁度进行归一化处理,最后根据对归一化威胁度大小的排序,提供给飞行员做辅助决策。利用BorlandC＋- Builder6．0编译环境和GoogleMaps编写空战威胁估计系统的仿真软件,通过软件仿真手段验证空战威胁估计方法的正确性。     

“电磁场与传输理论”中亥姆霍兹定理的类比教学法

亥姆霍兹定理是“电磁场与传输理论”中的一个重要定理,其数理表述抽象、物理意义深刻的特性使得学生在学习中普遍存在理解难度大的问题。我们通过优化教学方法,用类比教学法替代纯数学推导的传统教学方法,从电学谐振系统和力学的类比出发,可直观揭示亥姆霍兹定理所蕴含的数理意义。教学实践表明,通过类比教学法讲授亥姆霍兹定理具有很好的教学效果。     

CMM技术——介绍软件规模估计的两种方法

针对CMM推进中关键技术之一软件规模估计,介绍了基本概念、实施LOC统计的方法;详细描述了SEI推荐的基于历史知识数据的两种软件程序估计算法过程。     

Study on Top-Down Estimation Method of Software Project Planning

1Foreword Allprojectmanagementwillbeginwithprojectplan ning.Theprojectplanproducedbyprojectplanningis themostimportanttooltocoordinatetheprojectwork effectively,andmaketheprojectworkimplemented successfully.Onlybyeffectiveprojectplanning,could wemakeeffec…     

Collaborative tools and processes to support software engineering shift work

This paper describes the construction of and early experiences with a software engineering support environment for projects using globally distributed teams. The goals of the project are twofold. Firstly, it aims to construct a pragmatic solution to the problems experienced by widely geographically dispersed groups which collaborate on software development projects. Secondly, it aims to experiment with processes which facilitate software shift work through exploitation of time differences between collaborating groups. The construction of the support environment, known as GWSE (Global Working in Software Engineering) system, is presented, including its architecture and integration with existing workflow, document and project management tools. The use of the GWSE system in a trial development project is then described, including an initial quantitative analysis of the collaboration overheads experienced.     

Reporting bad news about software projects: impact of organizational climate and information asymmetry in an individualistic and a collectivistic culture

The reluctance of people to report bad news can be a major contributor to the phenomenon of runaway software projects. If senior managers receive bad news sooner, they may be able to prevent runaway software projects through corrective action. Two factors that are known to impact predisposition to report bad news are organizational climate (whether reporting bad news is likely to result in reward or punishment) and information asymmetry (whether hiding bad news is likely to be possible over time). Using matching experiments in an individualistic (United States) and a collectivistic culture (Singapore), this study investigates how the individualism-collectivism dimension of national culture may moderate the impact of organizational climate and information asymmetry on human predisposition to report bad news. The results revealed that individualism appeared to amplify the impact of organizational climate on predisposition to report bad news (compared to collectivism) whereas collectivism appeared to amplify the impact of information asymmetry on predisposition to report bad news (compared to individualism). When deciding on whether to report bad news about software projects, people from an individualistic culture seemed to be more sensitive to organizational climate whereas people from a collectivistic culture seemed to pay greater attention to information asymmetry. These results have useful implications for practice and research involving cross-cultural software project teams. Beyond these implications, these results add a cultural dimension to our existing knowledge on software project management.     

Software development projects IRSE buffer settings and simulation based on critical chain

Based on critical chain theory, this paper analyzes the software development projects for resource-constrained problems and gives solutions of them, suggests improved root square error (IRSE), the setting method of buffer sizes which is suitable for software development projects, and uses preemptive scheduling method based on heuristic algorithm and priority rules to plan the scheduling. The paper simulates the uncertainty of the project using computer simulation software. Comparing the result with traditional buffer setup method like cut and paste (C&P) and root square error (RSE) from two aspects, we find out that the IRSE buffer setup method can increase the buffer utilization rate while still maintains high stability which plays a direct positive effect in shortening the project duration.     

Cross-project software defect prediction based onmulti-source data sets

Cross-project defect prediction (CPDP) uses one or more source projects to build a defect prediction model and applies the model to the target project. There is usually a big difference between the data distribution of the source project and the target project, which makes it difficult to construct an effective defect prediction model. In order to alleviate the problem of negative migration between the source project and the target project in CPDP, this paper proposes an integrated transfer adaptive boosting (TrAdaBoost) algorithm based on multi-source data sets (MSITrA). The algorithm uses an existing two-stage data filtering algorithm to obtain source project data related to the target project from multiple source items, and then uses the integrated TrAdaBoost algorithm proposed in the paper to build a CPDP model. The experimental results of Promise's 15 public data sets show that: 1) The cross-project software defect prediction model proposed in this paper has better performance in all tested CPDP methods; 2) In the within-project software defect prediction (WPDP) experiment, the proposed CPDP method has achieved the better experimental results than the tested WPDP method.     

软件配置管理与UCM策略在移动终端项目中的实现

软件配置管理(SCM,Software Configuration Management)是一项基本的软件工程任务,用于管理当今复杂和快速发展的软件开发环境。本文介绍了SCM的最佳经验,并以SCM工具Rational CIearCase作为工具．展示了ClearCase在移动终端项目中如何通过统一变更管理(UCM,Unified Change Management)策略实现SCM的最佳经验。本文清晰地展示了如何通过Clear Case UCM简化和控制软件开发项目中的变更。     

基于敏捷开发项目工作量的估计方法研究

敏捷开发是当前非常流行的一种软件开发方法,而常用的软件工作量估计方法针对敏捷开发项目效果并不好。为能准确估算出敏捷开发项目的工作量,研究一种基于神经网络工作量估算模型,以适用于敏捷开发项目的工作量估计。     

中小软件项目中基于敏捷过程域控制的QA外包探索

软件的质量管理是控制软件品质乃至项目品质的重要手段,但企业在建设中小型软件项目时,极易受到条件的制约而无法控制项目的质量.将质量保证(QA)外包给第三方评估机构,通过实施SSTL设计搭建的轻载质量管理框架SQAF,约束质量管理过程中关键过程域,既能保证中小型软件项目运行的过程受控,又能避免重载质量体系对项目的繁琐制约.     

Implementing and improving the SEI Risk Management method in a university software project

Although risk management approaches appeared more than one decade ago, there is the evidence of low penetration rate of their techniques in current software projects. One of the most widely known methods is the SEI Software Continuous Risk Management (SEI-CRM) method. This paper addresses the usage of the SEI-CRM method in a big university software development project. Moreover, the study we carried out suggests that SEI-CRM is limited in terms of the organizational risk perspective. This research is expected to contribute with the knowledge on risk management for software development projects by for which we propose to extend the SEI-CRM method with some organizational risk factors that we have found relevant from our study.