The environment and requirements of modern war fields have been affected and thus changed by a variety of issues. To this end, the development of safety-critical weapon systems frequently need to meet those changes even in the operational phase. The necessity of the changes may be due to the preparation for mass-production or the request originated from the user military forces. To meet such a need can be even tougher in the development of safety-critical weapon systems since the integration of the requirements for both systems design and systems safety would make it troublesome. To handel the matter in this paper, utilization of architecture DB is proposed. Specifically, the situation in demand has first been analyzed and then a problem-solving process to accommodate the design changes has been constructed. In doing so, the concept of the aforementioned integration is particularly focused on the functional architecture, which could be a core concept of our approach to solving the problem. The result of a case study demonstrating the method studied using a computer-aided systems engineering tool is also presented.

In modern systems design and development, one of the key issues is considered to be related with how to reflect faithfully the stakeholder requirements including customer requirements therein, thereby successfully implementing the system functions derived from the requirements. On the other hand, the issue of safety management is also becoming greatly important these days, particularly in the operational phase of the systems under development. An approach to safety management can be based on the use of the failure mode effect and analysis (FMEA), which has been a core method adopted in automotive industry to reduce the potential failure. The fact that a successful development of cars needs to consider both the complexity and failure throughout the whole life cycle calls for the necessity of applying the systems engineering (SE) process. To meet such a need, in this paper a method of FMEA is developed based on the SE concept. To do so, a process model is derived first in order to identify the required activities that must be satisfied in automotive design while reducing the possibility of failure. Specifically, the stakeholder requirements were analyzed first to derive a set of functions, which subsequentially leads to the task of identifying necessary HW/SW components. Then the derived functions were allocated to appropriate HW/SW components. During this design process, the traceability between the functions and HW/SW components were generated. The traceability can play a key role when FMEA is performed to predict the potential failure that can be described with the routes from the components through the linked functions. As a case study, the developed process model has been applied in a project carried out in practice. The results turned out to demonstrate the usefulness of the approach.

Solar-cell Wafer 제조 공정에서는 각 공정 별로 품질 특성과 운전 조건을 측정하고 있다. 하지만 개별 이력추적이 되고 있지 않아 Input 정규성에 대한 부문이나, 선공정과 후공정 사이의 인과성, 공정 흐름에 따른 영향 파악이 힘든 실정이다. 공정 분석과 개선을 위해서는 특성치의 측정뿐만 아니라 공정 추적성의 확보가 필요하다. 99% 이상의 양품율을 유지하고 있는 공정이라도 인과성 확립 체계가 구축되어 있지 않다면 통계 분석 등을 이용한 공정 관리나 개선이 불가능하다. Marking System 구축으로 공정 추적성이 확보된다면 인과 분석 등 통계 분석을 활용한 공정 관리 및 개선으로 등급의 상향과 고효율, 고출력 제품 양산이 가능하며 보다 더 진보된 공정 관리 능력을 가질 수 있을 것으로 사료된다. Edge Isolation 공정을 중심으로 Laser Marking Machine를 이용하여 사이클타임의 손실 없이 각 Wafer의 소재입고부터 각 공정에 있어 이력추적이 가능하고, 샘플 기법과 Laser의 특성을 잘 활용할 수 있는 경제적이고 효율적인 Wafer Marking System을 개발하는 것이 이 연구의 목적이다.

It is well known that the test and evaluation plan (TEP) is very crucial in the successful development of safety-critical systems. As such, this paper discusses an approach to the development of the TEP for a system that should meet safety requirements in the systems development process. It is studied how to incorporate the result of preliminary hazard analysis (PHA) in generating the safety requirements. It is also discussed how to deal with them when the system requirements (i.e., functions, performance, constraints, components, etc) and the safety requirements are integrated into one model. While doing so, we have constructed the required traceability among them, which is necessary and very useful when the safety requirements need to be corrected or be changed. The use of the traceability makes it possible to easily check out whether and how the safety requirements are properly incorporated in the system design process. Furthermore, without the verified traceability, the system cannot be changed or upgraded later. In order to implement the model on a computer-aided tool, we have constructed a database (DB) schema. As a result, the implemented model/DB allows to automatically generate TEP which can be used to measure the performance and safety level of the developed system.