Scheduling algorithms for computer-aided line balancing in printed circuit board assembly

Generalized flexible flow line (GFFL) is a scheduling environment comprising several machine banks which the products visit in the same order but can skip some machine banks. The type of machines in a bank can differ but they are suitable for performing the same manufacturing tasks. To change one product to another demands a set-up operation of the machine. This paper describes several scheduling algorithms for the GFFL problem. The overall structure of these algorithms is similar, consisting of machine allocation and sequencing phases. The algorithms have been integrated into an interactive production scheduling system for electronics assembly. Sample cases are used to illustrate the operation of the system in practice.     

线性方程组的一些结果

本文给出了一类系数矩阵是特殊矩阵的齐次线性方程组的解的若干结果．     

产业投资基金对技术创新的影响：芯片企业的实证研究

我国芯片企业实现技术创新仍面临挑战。基于资源基础理论、市场失灵理论和良性循环理论，提出国家集成电路产业投资基金（简称“国家大基金”）促进企业技术创新的五个假说，选取2014-2021年间获得国家大基金的芯片企业，检验国家大基金对企业技术创新的影响，并探究国家大基金分别作用于芯片产业链的三个分支产业链企业的作用效果差异。结果表明：获得国家大基金的芯片企业比未获得的企业有更多创新产出；国家大基金通过融资约束缓解机制显著促进了企业技术创新；国家大基金保障年限与芯片企业技术创新呈U型关系，且芯片企业所在的地区创业投资环境在二者中起调节作用。     

NATO's strategic communication as international public relations: The PR practitioner and the challenge of culture in the case of Kosovo

The role of supranational organizations is changing as they are becoming more involved in, responding to, and finding solutions for, many different events occurring in our world. This article discusses one such organization, the North Atlantic Treaty Organization (NATO) and its public relations strategies during its military campaign in Kosovo in 1999. The circuit of culture model provides the basis for a discussion of the public relations practitioner as cultural intermediary, and aligns the model with the method of critical discourse analysis to examine the public relations strategies used by NATO during this campaign. The article contends that the charismatic skill of the NATO spokesperson played an important role in establishing the organization as a humanitarian military powerhouse through discursive positioning of the organization acting in the interests of the international community. By doing so and, at the same time, NATO legitimized its own continuation as a viable supranational organization for the 21st century.     

用差分方程求解一阶线性网络对周期性激励的响应

本文提出了一种新的方法,用来求解一阶线性网络在周期性激励作用下的响应,特别是用这个方法能够求出含周期性动作开关的有源网络的响应。文中应用差分方程分析这类问题,使求解过程变得十分简便。     

Guerrilla communication,visual consumption,and consumer public relations

Guerrilla communication has grown into an increasingly prominent strategy adopted by large corporations such as American Express, BP Amoco, Chrysler, Hershey Foods, and Pepsi. In its attention-grabbing instantiations, guerrilla communication points to the convergence of advertising, marketing, and public relations in consumer communication practices. This essay also considers guerrilla communication's place in the circuit of culture.     

关于位移电流的引入

本文从安培环路定理、高斯定理及电荷守恒定律出发导出了位移电流的具体形式。并对位移电流作了简单的讨论。     

周期加倍和周期加1交替的规律——仿蔡氏电路中的混沌现象

本文详述了在仿蔡氏电路中发现的一些十分引人的混沌现象。文中首先描述了该电路的结构和状态方程,并根据Shilnikov定理从特征值的特点确定了该电路的混沌性质,然后介绍从实验研究到频谱分析得到的非常有价值的结果,即从平衡态开始经倍周期分叉导致混沌和从起始周期为1开始的周期-混沌-周期加1规律。文末还给出了改变参数G由Hopf分叉导致混沌的数值范围。     

《高频电子线路》课程教学方法的研究与实践

根据《高频电子线路》课程的特点,结合教学实践,提出了一种新的合理的教学方案。从调动学生的积极性、采用多种教学方法和手段、改善基础实验和增设课程设计四个方面出发,提高教学质量,达到较好的教学效果。     

A simulation-based dynamic operator assignment strategy considering machine interference - a case study on integrated circuit chip moulding operations

A simulation-based dynamic operator assignment strategy is proposed considering machine interference in solving an integrated circuit moulding operation problem. The strategy iteratively solves a floating manpower operator-assignment problem between simulation-based diagnostic study and operator assignment decision. Given current-state information, it provides a means for system performance evaluation. It searches a satisfactory solution for both cycle time and service level performances by using floating manpower method. A structured experimental design is used to illustrate the effectiveness of the proposed methodology. Empirical results show promise for the proposed methodology in solving a practical application. Finally, the system implementation constraints from both hardware and management problems are addressed.