생산성 향상과 시스템 통합의 주도자로서의 산업공학 엔지니어링의 위상을 업계의 입장에서 점검하고, 미력하나마 우리나라의 산업공학이 지향해야 할 방향을 제시한다.

나는 산업공학의 분야에서 종사하고 있음을 자랑스럽게 생각한다. 그 이유는 산업공학은 일반인의 인식이 매우 부족한 상태에서 출발하여 현재는 공학중의 공학으로 자리를 굳혀가고 있기 때문이다. 내가 산업공학을 접하게 된 것은 60년대 초반으로 한국 생산성본부 시절부티이다. 그 당시만해도 작업개선이나 공정개선에 의한 수익중대 보다는 여하이 하룻밤 세무처리를 잘하는가에 따라 엄청난 이득을 볼 수 있었던 시절이다. 어디 그 뿐이랴. 자재를 많이 사놓기만 하면 날로 달로 가격이 뛰어올랐기 때문에 적정재고고 무엇기고 경영자들에게 크게 먹혀들리가 없었다. 그러니 자연히 산업공학이 뒤쳐질 수 밖에 없었다. 그러나 지금의 사정은 어떠한가.

The purpose of this paper is to present how to prepare pro forma manufacturing cost, and profit and loss statements using the historical data of the industry to which the project under consideration belong to. This approach is proposed because it is relatively simple compared with possible alternative methods. The approach proposed here can be used in countries other than Korean if relevant historical data is available. An example is shown.

This paper develops MRP system with two-types of lead time(average lead time and emergent lead time). In this proposed MRP system, Material Requirement Planning is scheduled by using average lead time, but the emergent lead time is used only when start date of planned order is past. Btrieve data management technique and Stack structure are used for recalculating procedure of planned order with the TURBO PASCAL Version 5.5. An example is also considered.

In this paper, the Go-Back-N ARQ protocol with decoding in communication network is considered. The time delay and throughput are respectively analyzed as a function of window size and decoding time out. Packets arrive continuously at the decoder, and are stored in a buffer if the decoder is busy upon its arrival. The decoder devotes no more than a time-out period of predetermined length to the decoding of any single packet. If packet decoding is completed within that period, the packet leaves the system. Otherwise, it is retransimitted and its decoding starts anew. The time delay and throughput are obtained using recursive formula and difference equation. An appropriate time out and window size that satisfies the grade of service can be determined.

Presented in this paper is a systematic approach to "modeling and simulation' of flow lines in mass production systems, using a tire trimming line as an example. The "modeling phase" consists of 1) generation of alternative line configurations, 2) construction of a reference model for each alternative, and 3) formal description of the target system. ACD(Activity Cycle Diagrams) are employed as a tool for formal description. In the "simulation phase'. block diagram models (provided by the simulation language SIMAN) and the next event methodology(implemented in FORTRAN 77) are combined in order to fully describe the flow line behavior.

This study proposes a half-simulation-half-real system that is used as an FMS building tool. In this hybrid system. softwares related to the operation of the FMS and the computer network on which the softwares run are real, while the physical movements of the devices in the system are simulated. The study shows the structure of the proposed system as well as the building procedure for the system. Adventages and usages of the system are also stated in detail.