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FMS의 생산계획 및 일정계획을 위한 단계적 해법에 관한 연구
장성용,박진우 한국경영과학회 1990 한국경영과학회 학술대회논문집 Vol.- No.1
Flexible Manufacturing System (FMS) is an integrated, computer controlled complex of automated matrerial handling devices numerically controlled machine tools that can simultaneously process medium-sized volumes of a variety of part types. This paper discusses planning problems that can be solved for efficient use of an FMS and present an integrated decision support system for FMS production planning and scheduling problems. FMSDS (Flexible Manufacturing Systems Decision Support System) consists of data handling modules, part selection module, loading module, load adjusting module, scheduling module and simulation module etc. This paper presents the solution methodology of each subproblems and integrated between subproblems using hierarchical approaches and loop controls considering the relationships between subproblems.
장성용 한국경영과학회 2003 한국경영과학회 학술대회논문집 Vol.- No.1
이 논문은 TOC(Theory of Constraints) 기반의 DBR(Drum-Buffer-Rope) 스케줄링 기법의 기본 개념을 소개하고, 이 기법이 처음 개발되어 오늘에 이르기까지 실제 생산기업에 적용되고 이론적으로 발전되어온 역사를 문헌을 중심으로 고찰하는 것이다. DBR 스케줄링 기법의 기본 개념 및 구조를 간단한 사례를 중심으로 설명하였으며, 1988년 처음 개발된 이후 발표된 논문을 중심으로 프로세스 산업 적용, 반도체 산업 적용, DBR과 ERP 통합, MPS 문제, 버퍼 크기 문제, 공급망 관리와의 연계, VAT 분석, JIT와의 연계, 서비스 산업에의 적용, 일반 산업 응용 사례, DBR 시스템 개발 등으로 나누어 문헌 분석을 한 결과를 제시하였다. 마지막으로 향후 DBR 기법의 발전 방향 등에 대하여 논의하였다.
시뮬레이션 기법을 이용한 컨테이너 터미널의 자원할당 전략에 관한 연구
장성용 한국시뮬레이션학회 1999 한국시뮬레이션학회 논문지 Vol.8 No.4
This paper presents an estimation method of container handling capacity and selection of resource allocation strategies of container terminals using the computer simulation models. Simulation models are developed to model container terminal consisting of 4 berths considering the berth allocation strategies, crane allocation strategies and the total number of container cranes using Arena simulation package. The proposed models do not consider the yard operations and gate operations. All the input parameters for the models are estimated on the basis of the existing container terminal operation data and the planning data for the automated container terminal planned by Korean government. Four berth allocation strategies and three crane allocation strategies are considered. The total number of container cranes considered ranges from 12 to 15. Non-terminating simulation techniques are utilized for the performance comparison among alternatives. The performance measures such as average ship turnaround time, average ship waiting time, average ship service time, the number of containers handled per year, and the number of ships processed per year are used. The result shows that the berth allocation strategy minimizing the sum of the number of ships waiting, the number of busy container cranes and number of ships handled performs better than any other berth allocation strategies. In addition, the crane allocation strategy allocating up to 5 container cranes per berth performs better than any other crane allocation strategies. Finally there are no significant performance differences among the alternatives consisting of different total number of container cranes allocated.
장성용,권성규,신종관,유재남,오선호,정진웅,송형섭,김철영,이가원,이희덕 대한전자공학회 2015 Journal of semiconductor technology and science Vol.15 No.2
In this paper, the RF characteristics of multi-finger MOSFETs were improved by decreasing the parasitic capacitance in spite of increased gate resistance in a 90-nm CMOS technology. Two types of device structures were designed to compare the parasitic capacitance in the gate-to-source (Cgs) and gate-to-drain (Cgd) configurations. The radio frequency (RF) performance of multi-finger MOSFETs, such as cut-off frequency (fT) and maximum-oscillation frequency (fmax) improved by approximately 10% by reducing the parasitic capacitance about 8.2% while maintaining the DC performance.
G² Continuity Smooth Path Planning using Cubic Polynomial Interpolation with Membership Function
장성용,허욱열 대한전기학회 2015 Journal of Electrical Engineering & Technology Vol.10 No.2
Path planning algorithms are used to allow mobile robots to avoid obstacles and find ways from a start point to a target point. The general path planning algorithm focused on constructing of collision free path. However, a high continuous path can make smooth and efficiently movements. To improve the continuity of the path, the searched waypoints are connected by the proposed polynomial interpolation. The existing polynomial interpolation methods connect two points. In this paper, point groups are created with three points. The point groups have each polynomial. Polynomials are made by matching the differential values and simple matrix calculation. Membership functions are used to distribute the weight of each polynomial at overlapped sections. As a result, the path has continuity. In addition, the proposed method can analyze path numerically to obtain curvature and heading angle. Moreover, it does not require complex calculation and databases to save the created path.