Suppression of tin whisker formation on fine pitch connectors by surface roughening

In the electronics industry, lead-free solder processes such as the terminal plating of electronic components, fine pitch connectors, and flexible printed circuits (FPCs) are invariably hampered by the serious problem of tin whisker formation. Here, a new and simple method, the JVC Micro Island (JMI) process, is proposed for the prevention of tin whisker formation in fine pitch connectors. Briefly, the base copper terminal was acid etched to afford a roughened surface, which was then tin plated. The contact test with Knoop indentation proved the effectiveness of the present process. The maximum length of the as-formed tin whiskers was less than 50 μm. The solderability of the JMI FPCs was not influenced by the present process. Thus, the new JMI process is shown to have a great advantage for the prevention of tin whisker formation in fine pitch connectors.     

Leveraging UML Profiles to Generate Plugins From Visual Model Transformations

Model transformation is a fundamental technology in the MDA. Therefore, model transformations should be treated as first class entities, that is, models. One could use the metamodel of SDM, a graph based object transformation language, as the metamodel of such transformation models. However, there are two problems associated with this. First, SDM has a non-standardized metamodel, meaning a specific tool (Fujaba) would be needed to write transformation specifications. Secondly, due to assumptions of the code generator, the transformations could only be deployed on the Fujaba tool itself. In this paper, we describe how these issues have been overcome through the development of a template based code generator that translates instances of a UML profile for SDM to complete model transformation code that complies to the JMI standard. We have validated this approach by specifying a simple visual refactoring in one UML tool and deploying the generated plugin on another UML tool.     

供应链环境下联合库存管理的库存成本模型

研究了供应链环境下的联合库存管理策略.在前人研究的基础上结合实际情况,考虑了有初始库存、允许库存短缺、缺货需立即补充的情况,建立合理的联合库存成本模型与利润模型,并定量地分析联合库存管理的库存成本模型较传统的库存成本模型在节约成本上的优势.     

供应链环境下联合库存管理的库存成本模型

研究了供应链环境下的联合库存管理策略．在前人研究的基础上结合实际情况，考虑了有初始库存、允许库存短缺、缺货需立即补充的情况，建立合理的联合库存成本模型与利润模型，并定量地分析联合库存管理的库存成本模型较传统的库存成本模型在节约成本上的优势．     

供应链牛鞭效应成因与减弱方法研究

库存控制一直都是供应链管理的一个重要环节,而在供应链产供销各个环节运作过程中,牛鞭效应一直都存在,造成大量库存积压,降低了供应链的效率.为了减弱牛鞭效应,对牛鞭效应产生的原因进行了分析,提出了几种减弱牛鞭效应的方法,其中着重分析了VMI,JMI,TPL三种库存控制方法,建立了牛鞭效应模型,结合对供应链结构的分析,指出了三种库存控制方法从不同的角度对减弱牛鞭效应的作用.     

海军装备维修器材联合库存管理研究

从供应链协同的角度,构建了海军装备维修器材联合库存管理体系,提出了其应用策略,指出了:基于网络的器材信息系统的建设和不同器材采取不同的联合库存管理方式以及减少供应层次,是应用关键;在业务的协同中快速精确保障部队器材需求,减少库存成本,是实施器材联合库存管理的最终目的。