微机辅助设计机械产品装配图

本文提出一个在微机上设计机械产品装配图的方式。以Auto CAD为图形支持软件,利用其图形处理功能构成零件图子集,继而按装配要求形成草图,通过接口程序将图形信息转换成数字信息,求交、消隐后自动生成所需的产品装配图。     

联合国安理会首次扩大的缘起、历程及其启示

1965年生效的关于噌加联合国以安理会为主的主要机构成员的宪章修正案，是联合国宪章的首次修正，也是迄今为止安理会唯一一次成功的扩大，对安理会内部的权力均衡和运作机制产生了深远影响。同时，也为今天安理会的改革，如相关利益方有效的政策整合、广泛共识的达成、循序渐进的原则、大国应勇于承担国际责任以及对有利时机的把握等，提供了成功的经验。     

On vendor part delivery dates in a stochastic assembly system

This paper describes the development of a model for the determination of optimal mean part delivery dates in a stochastic assembly system for the objective of minimizing the expected cost of subassembly and part inventory. Parts are assembled at each station to a subassembly. The part delivery and processing times at assembly stations follow known probability distributions. An approximate solution technique based on the optimization of individual stations in isolation is developed. The approximation applies a correction factor, as a function of the variability in part delivery and processing time, cost parameters and number of stations, to the decisions from the single station solutions to compensate for interdependence between stations. Results indicate that this is an effective approach and yields good near-optimal solutions with very little computational effort. Insights regarding the effect of the type of distribution used, random processing times, variance of the distribution used and cost parameter values on part delivery dates are also reported.     

小春改制预留行的合理利用

试验表明:小春改制预留行利用形式应多样化,生产上应以小麦十大麦、小麦十油菜为主。并用生态学的观点,对预留行利用后的增产原因进行了分析。     

韩国国民大会的预算权力

韩国现行宪法将立法权和预算权等赋予了民选的国民大会。但由于韩国宪法的几经变迁,韩国国民大会预算权力的一些基本原则和具体制度也在不断发生改变。但从《宪法》、《国会法》和《预算会计法》三部主要的法律来看,韩国国会在预算审批、执行和决算几个环节中起着决定性的作用,原则上刚性,细节上具体,是韩国预算立法的基本特征。     

在装配模型中装配顺序的判断

在计算机辅助装配模型或面向装配的设计中，装配顺序是一个必要的基础条件。近十年在装配模型和产生装配顺序的领域内进行了大量的研究，两种主要的研究途径是组成和分解模型。本文提出一种新型的基于零件空间拓扑关系分类的构造装配关系矩阵，经过数学分析和推导，可证明装配矩阵能够转化为一个对角阵。对角阵各元素的物理意义是：在装配模型中元素的值越大说明该零件连接的其他零件越多，这种方法被证明是有效和切实可行的。     

韩国预算程序中的国民大会

国民大会是韩国最高立法机关,在预算程序中起着重要作用。从实证的角度看,预算编制阶段,国民大会享有有限建议权;预算审批阶段,国民大会享有部分修改权;预算执行阶段,惟行政集权;预算控制和监督阶段,国民大会起着最终决定权。     

VAX-11机宏指令的编制——汇编语言中浮点数输入输出和建立数据文件

本文介绍利用VAX-11 RMS(记录管理服务)编制单精度浮点数输入输出宏指令和建立磁盘数据文件的技术和算法。成果已用于VAX-11/780机上,给我院VAX-11宏汇编语言的教学带来了很大的方便。     

Preparing Social Workers for Practice: Re-evaluating Student Learning Needs

Among the key developmental priorities that have been identified in the current process of reform taking place in social work in the UK is the need to improve social work students' preparedness to meet the challenges they will encounter in practice. This paper contributes to the current debate about this issue by reporting a research study that focused on final year undergraduates' experience of academic and practice learning and considered the impact of demographic factors, including age, gender, disability, previous experience and qualifications, on their perceptions of preparedness. The results indicate that students were satisfied with most aspects of preparatory teaching and learning. However, the findings also highlight areas in which students' preparation could be further enhanced, including their skills in dealing with conflict and managing risk. The results suggest that social work programmes should not overly depend on practice learning to prepare students to address the challenges presented by increasingly complex working environments and that educators need to work closely in collaboration with employing partners to ensure that the curriculum keeps up to date with the changing learning needs of practitioners.     

Multiple criteria approach for solving feeder assignment and assembly sequence problem in PCB assembly

The feeder assignment and assembly sequence problem in printed circuit board (PCB) assembly with the twin objectives of minimizing magazine travel time and minimizing board travel time is presented in this study. The problem uses Dynamic Pick-and-Place (DPP) model where robot arm, board and magazine move together with different speeds based on relative coordinates between consecutive assembled points. The difficulty of the problem is that the feeder assignment depends on assembly sequence and vice versa. A new approach is proposed to improve the existing approaches. The trade-off between two strategies, assembly by area and assembly by component types, can give better results. The numerical experiments proved the efficiency of the new algorithm.