• Design & Manufacturing
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• 제6권2호
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• pp.17-23
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• 2012

In April 2010, the die and mould grand prix for university student was held in Osaka as a special event of Inter Mold Japan. The students from Korea, China, and Japan participated to demonstrate the design and manufacturing skill of die and mould. Based on the given product drawing of Test Work, progressive die should be designed and manufactured. Also, production of Test Work should be carried out. This study had been conducted to participate in the grand prix and to learn practical knowledge and experience from real die design and making. Test Work is made of SPCC and includes piercing, blanking, deep drawing and burring. From the analysis of product drawing, process planning and die design was carried out. Progressive die for Test Work was manufactured using CNC milling, grinding, wire-cutting and polishing. The production was successfully completed using mechanical press and product showed very good accuracy satisfying all dimensional tolerances.

• 제어로봇시스템학회:학술대회논문집
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• 제어로봇시스템학회 2002년도 ICCAS
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• pp.120.6-120
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• 2002

This paper presents an application of rule based expert system to GDS. Expert system is a computer-based system that uses knowledge, facts, and reasoning techniques to solve problems that normally require the abilities of human experts. Expert system can be classified as synthesis expert system, classification expert system or combination of these. The Expert system of GDS belongs to the synthesis type of expert system. GDS is a graphic design environment that automates complex and time consuming processes in the design phase of the grating production. There are methodical procedures in the design phase of gratings and each process needs the know-how of a skillful designer. User has to know...

• 한국비블리아학회지
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• 제25권1호
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• pp.39-60
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• 2014

국내 대학도서관의 교내 지식자원 수집활동은 대학의 규모에 따라 차이가 크고, 디지털 자원의 수집은 일부 유형에 집중되어 있는 것으로 조사되었다. 최근 선진국 주요 대학들은 지식생산기지로서 이미지 개선을 통한 경쟁력 제고를 위하여 대학의 지식자원에 대한 OA기반 기관리포지토리 방식의 사회적 개방과 공유 활동을 활발히 전개하고 있다. 본고는 대학 지식자원의 통합관리 적임자로서 대학도서관의 역할을 제고하기 위하여, 대학원, 연구소, 교수학습센터, e-learning 지원센터, 박물관, 출판국, 기록관 등 교내 다양한 조직들이 생산하는 지식자원을 효과적으로 수집하고 통합관리하기 위하여 요구되는 관련법제의 개선방안을 검토하였다. 이를 위하여 전국 176개 종합대학의 도서관규정 운영 실태를 조사하여, 납본범위의 확대와 디지털납본을 촉진하기 위하여 필요한 정비방안을 제시하고, 관련 규정의 개선방안을 검토하였다.

• 한국콘텐츠학회논문지
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• 제5권3호
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• pp.29-35
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• 2005

숙련된 세포유전학자가 수행하는 염색체 분석과 진단 작업은 반복적이고, 시간 소비적이며, 많은 비용이 요구된다. 이러한 이유로, 전문가를 대신하여 염색체 분석에 필요한 정보를 얻을 수 있도록 웹을 이용한 염색체 지식 베이스 기반 지능형 에이전트를 개발하였다. 즉, IF-THEH 생성규칙으로 이루어진 지식 베이스에서 정상 염색체와 비정상 염색체를 하나의 지식 영역으로 구성하고, 추론을 통해 염색체를 분석하고 진단결과를 제시하였다. 연구에 사용한 데이터는 GTG 방법으로 분염된 중기 말초혈액과 양수샘플을 핵형분류하여 얻은 2,736환자 증례의 정상 염색체와 259환자 증례의 비정상 염색체들로 구성하였다. 구축된 염색체 지식 베이스 기반 인텔리전트 에이전트는 정상 염색체와 비정상 염색체의 분석을 통해 다양한 형태학적 정보를 제공하고, 사용자와 시스템간의 상호작용을 통하여 염색체 분석과 진단을 협의할 수 있는 장점들을 지닌다.

• 산업경영시스템학회지
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• 제40권1호
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• pp.35-40
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• 2017

A most important progress in civilization was the introduction of mass production. One of main methods for mass production is die-casting molds. Due to the high velocity of the liquid metal, aluminum die-casting is so complex where flow momentum is critical matter in the mold filling process. Actually in complex parts, it is almost impossible to calculate the exact mold filling performance with using experimental knowledge. To manufacture the lightweight automobile bodies, aluminum die-castings play a definitive role in the automotive part industry. Due to this condition in the design procedure, the simulation is becoming more important. Simulation can make a casting system optimal and also elevate the casting quality with less experiment. The most advantage of using simulation programs is the time and cost saving of the casting layout design. For a die casting mold, generally, the casting layout design should be considered based on the relation among injection system, casting condition, gate system, and cooling system. Also, the extent or the location of product defects was differentiated according to the various relations of the above conditions. In this research, in order to optimize the casting layout design of an automotive Oil Pan_BR2E, Computer Aided Engineering (CAE) simulation was performed with three layout designs by using the simulation software (AnyCasting). The simulation results were analyzed and compared carefully in order to apply them into the production die-casting mold. During the filling process with three models, internal porosities caused by air entrapments were predicted and also compared with the modification of the gate system and overflows. With the solidification analysis, internal porosities occurring during the solidification process were predicted and also compared with the modified gate system.

• 산업경영시스템학회지
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• 제42권1호
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• pp.1-7
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• 2019

In the modern industrial period, the introduction of mass production was most important progress in civilization. Die-casting process is one of main methods for mass production in the modern industry. The aluminum die-casting in the mold filling process is very complicated where flow momentum is the high velocity of the liquid metal. Actually, it is almost impossible in complex parts exactly to figure the mold filling performance out with the experimental knowledge. The aluminum die-castings are important processes in the automotive industry to produce the lightweight automobile bodies. Due to this condition, the simulation is going to be more critical role in the design procedure. Simulation can give the best solution of a casting system and also enhance the casting quality. The cost and time savings of the casting layout design are the most advantage of Computer Aided Engineering (CAE). Generally, the relations of casting conditions such as injection system, gate system, and cooling system should be considered when designing the casting layout. Due to the various relative matters of the above conditions, product defects such as defect extent and location are significantly difference. In this research by using the simulation software (AnyCasting), CAE simulation was conducted with three layout designs to find out the best alternative for the casting layout design of an automotive Oil Pan_BJ3E. In order to apply the simulation results into the production die-casting mold, they were analyzed and compared carefully. Internal porosities which are caused by air entrapments during the filling process were predicted and also the results of three models were compared with the modifications of the gate system and overflows. Internal porosities which are occurred during the solidification process are predicted with the solidification analysis. And also the results of the modified gate system are compared.

• 산업경영시스템학회지
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• 제22권53호
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• pp.45-54
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• 1999

Manufacturing today is becoming increasingly competitive. If a company is to exist and successfully compete, it must pay very careful attention to production management, total quality assurance and total proactive maintenance issues. Overall machine performance, repair efficiency, system level utilization, productivity and quality of output need to be optimized as possible. To accomplish that objective, the behavior of manufacturing equipment and systems need to be monitored and measured continuously if it is possible. Then early warning of possible failure should be generated and proacted on that type of the situation to improve overall operation performance of manufacturing environment. In this paper, Proactive maintenance framework using performance-based reliability structure as enabler technology is proposed. Its paradigm enables one to maximize system through-put and product quality as well as resources in the performance domain. In the case of inadequate knowledge of the failure mechanics, this empirical modeling concept along with performance degradation knowledge can serve as an important product and process improvement tool. The real-time framework extension to proposed framework uses on-line performance information and is capable of projecting the remaining useful period.

• 대한전기학회:학술대회논문집
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• 대한전기학회 1988년도 전기.전자공학 학술대회 논문집
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• pp.963-966
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• 1988

This paper describes the development of a prototype expert system, which is designed to analyze loom production efficiency by employing a loom monitoring system. The problem field of the prototype expert system is the loom failure analysis which has a great effect on prouction efficiency, and the characteristic graph in which the loom failure causes are classified and organized, is used in the analysis. The knowledge for characteristic graph is organized, and an effective inference engine- is developed. The developed system is tested and modified using hypothetical loom failure causes, and the feasibility of the expert system application to extend the functions of the loom monitoring system is proved.

• 한국정보처리학회:학술대회논문집
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• 한국정보처리학회 2000년도 추계학술발표논문집 (상)
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• pp.329-332
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• 2000

지식기반시스템에서 지식의 일관성을 유지하는 것은 신뢰성 있는 추론 결과를 위해서 필수적인 요소이다. 추론은 지식을 기반으로 행해지기 때문이다. 따라서 본 논문에서는 새로운 지식이 지식베이스에 첨가되기 전에 기존의 지식베이스의 지식들과 첨가될 지식과의 일관성 여부를 검사한 후 일관성이 유지될 때만 지식이 첨가되는 시스템을 구축하였다.

• 경영과정보연구
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• 제2권
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• pp.169-193
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• 1998

Case- based reasoning(CBR) offers a new approach for developing knowledge based systems. Unlike the rule-based paradigm, in which domain knowledge is encoded in the form of production rules, in the case-based approach the problem solving experience of the domain expert is encoded in the form of cases stored in a casebase(CB). CBR allows a reasoner (1) to propose solutions in domains that are not completely understood by the reasoner, (2) to evaluate solutions when no algorithmic method is available for evaluation, and (3) to interprete open-ended and ill-defined concepts. CBR also helps reasoner (4) take actions to avoid repeating past mistakes, and (5) focus its reasoning on important parts of a problem. Owing to the above advantages, CBR has successfully been applied to many kinds of problems such as design, planning, diagnosis and instruction. In this paper, I propose case-based DSS(CBDSS). CBDSS is an intelligent DSS using CBR technique. CBDSS consists of interface, case-based reasoner, maintainer, casebase management system, domain dependent CB, domain independent CB, and so on.