• 안전기술
• /
• 제144호
• /
• pp.24-27
• /
• 2009

• 한국조리학회지
• /
• 제21권6호
• /
• pp.1-13
• /
• 2015

본 연구는 커피전문점 예비창업자들을 대상으로 커피전문점 창업의도에 창업 자기효능감, 일가치(내재적 일가치 및 외재적 일가치) 및 창업지원서비스에 대한 유용성 지각 등이 영향을 미치는지를 확인하고자 하였다. 커피전문점 종사자 중 향후 커피전문점 창업의도가 있는 자 300명으로부터 자료를 수집하였다. 분석결과, 첫째, 커피전문점 예비창업자의 창업 자기효능감은 창업의도에 영향을 미치는 것으로 나타났다. 둘째, 커피전문점창업에 대한 일가치 지각과 창업의도와의 관계에서는 내재적 일가치만 창업의도와 통계적으로 유의한 영향관계에 있다는 것이 밝혀졌다. 이는 경제적 보수, 지위 등의 외재적인 가치요인보다 자기개발, 발전가능성, 자기만족 등 창업이란 새로운 직업이 제공하는 본질적인 가치속성들이 커피전문점을 창업하고자 하는데 더 큰 영향을 미친다는 것을 의미한다. 마지막으로, 커피전문점 예비창업자의 창업지원서비스에 대한 유용성 지각은 창업의도에 영향을 미치는 것으로 나타났다. 이러한 결과는 정부의 창업지원서비스의 중요성을 다시 한 번 일깨워 준다.

• 산업공학
• /
• 제18권2호
• /
• pp.136-147
• /
• 2005

This paper introduces a simulation study regarding the operation of the Painted Body Storage (PBS) in an automobile factory. In the paint shop of the factory, same colored bodies are grouped together in order to increase the effectiveness of process, for example decrease the loss of cleaning the painting-gun when the color of body changes from one to another. However the production of automobiles in the assembly shop is a typical example of the mixed model assembly production. Therefore PBS locates between the paint shop and the assembly shop for control the input sequence of bodies to the assembly shop, and it enables to meet the smoothing requirement of assembly sequence. There are highly restricted constraints on the assembly sequence in a assembly shop. Those are spacing restriction and smoothing restriction. If such restrictions are violated, conveyor-stop or utility work will be necessary. Thus the major objective of PBS is to control the assembly sequence in a way to meet the two restrictions. In this paper a case study of PBS in an automotive factory is introduced. The storage/retrieval algorithms are suggested and the proposed system is verified using simulation models. Sensitivity analysis for operating factors is also conducted.

• 기술사
• /
• 제34권1호
• /
• pp.53-58
• /
• 2001

최근 건설공사에 있어서의 VALUE ENGINEERING 적용에 대한 관심이 높아지고 있으며 VE WORK-SHOP 을 통한 많은 효과가 현대건설의 사례에서 입증이 되고 있음에도 신문매체 등에 발표되는 VE 관련 논고가 일반론적 기고에 국한되어 있어 VE에 대한 이해에 큰 도움은 되지만 갈증을 해소하기에는 어려운 실정이며 우리사회에 전문성을 가진 리더군이 많지 않음을 반증하는 것도 되기에 향후 좀더 많은 VE 경험을 토대로 한 리더군이 형성되어 다양한 주제를 기사화한 실무적인 VE 기법의 소개가 필요하다고 본다. VE 적용은 그 기법이 매우 다양하므로 해당 공사의 시기와 특성, 제약요소 팀원 구성의 전문성 등 다양한 요소를 종합적으로 고려하여 가장 적합한 형태의 VE가 추진될 수 있도록 VE 계획 시 추진 팀의 방향설정과 역할분담이 필요하고 준비되어야 한다. 특히 WORK-SHOP 형태의 VE는 현장 테마 중임의 ITEM VE에 비하여 적은 투입으로 많은 효과를 거둘 수 있지만 팀원의 전문성이 결여시 VE 작업결과의 시행에 따른 신뢰도가 떨어질 수 있는 가능성을 내포하고 있으므로 추진팀의 입장에서는 보다 세심하고 조직적으로 접근 할 필요가 있다. 성공적인 VE 작업을 하기 위하여서는 특히 WORK-SHOP 개념의 새로운 기법을 설계 및 시공초기에 단계적으로 적용하고 VE 팀 리더의 효과적인 VE 작업을 위한 절차의 명확한 이해와 선진 기법의 이해를 바탕으로 한 팀원의 교육과 가이드가 점점 중요한 요소가 되고 있다. 실제 건설공사에 있어 효과적인 VE를 적용하기 위한 핵심요소를 VE 교육을 진행하고 있는 담당 실무자 입장에서 정리하여 보았으며 기회가 허락되면 한 두 차례의 추가 연재를 통하여 상세히 논하고자 한다.

• 산업공학
• /
• 제7권2호
• /
• pp.75-85
• /
• 1994

This paper presents a production scheduling model in a block assembly shop in shipbuilding industry. In a block assembly shop, the most important performance criterion is load leveling, which balances manpower and work area utilization through the planning horizon. The problem is formulated as a mixed-integer nonlinear programming(MINLP) problem of which objective function is to optimize load leveling. The developed MINLP problem can not be solvable due to computational complexity. The MINLP problem is decomposed into two stage mixed-integer linear programming (MILP) problems to obtain a good solution, but the decomposed MILP problems are still computationally intractable because of combinatorial complexity. Therfore, a heuristic method using linear programming is proposed to solve two stage MILP problems sequentially. The proposed heuristic generates a good production schedule within a reasonable computation time, and it is easily applicable for establishing the production schedule in a block assembly shop in shipbuilding industry.

• 한국경영과학회지
• /
• 제16권2호
• /
• pp.125-125
• /
• 1991

This paper presents a framework for the hierarchical PPC(Production Planning and Control) in make-to-order environment with job shop. The characteristics of the environment are described as : 1) project with non-repetitive and individual production, 2) short delivery date, 3) process layout with large scales manufacturing. 4) job shops. The PPC in a make-to-order typically are organized along hierarchical fashions. A model is proposed for the hierarchical job shop scheduling based on new concepts of production system, work and worker organization. Then, a new integrated hierarchical framework is also developed for the PPC based on concepts of the proposed job shops scheduling model. Finally, the proposed framework has been implemented in the Electric Motor Manufacturing and the results showed good performance.

• 경영과학
• /
• 제16권2호
• /
• pp.125-135
• /
• 1999

This paper presents a framework for the hierarchical PPC(Production Planning and Control) in make-to-order environment with job shop. The characteristics of the environment are described as : 1) project with non-repetitive and individual production, 2) short delivery date, 3) process layout with large scales manufacturing. 4) job shops. The PPC in a make-to-order typically are organized along hierarchical fashions. A model is proposed for the hierarchical job shop scheduling based on new concepts of production system, work and worker organization. Then, a new integrated hierarchical framework is also developed for the PPC based on concepts of the proposed job shops scheduling model. Finally, the proposed framework has been implemented in the Electric Motor Manufacturing and the results showed good performance.

• 산업경영시스템학회지
• /
• 제28권1호
• /
• pp.140-146
• /
• 2005

This study presents the new dispatching rules of job shop scheduling with auxiliary resource constraint to improve the schedule performance measures related to completion time and due dates. The proposed dispatching rules consider the information of total work remaining and machine utilization to decrease mean flowtime and mean tardiness. The results of computer experiments show that those schedule performances are significantly improved by using the new dispatching rules. The results provide guidance for the researchers and practitioners of auxiliary resource constrained job shop scheduling to decrease mean flowtime and mean tardiness.

• 품질경영학회지
• /
• 제17권1호
• /
• pp.69-81
• /
• 1989

This study is concerned with a job sequencing method using the concept of sampling technique in the case of Job Shop. This is the follow study of Kang and Ro (1988) which examined the possibility of application of sampling technique to determine the Job Sequence in the case of Flow Shop. Not only it is very difficult, but also it takes too much time to develop the appropriate job schedules that satisfy the complex work conditions. The most job sequencing algorithms have been developed to determine the best or good solution under the special conditions or assumptions. The application areas of these algorithms are also very narrow, so it is very hard to find the appropriate algorithm which satisfy the complex work conditions. In this case it is very desirable to develop a simple job sequencing method which can select the optimal job sequence or near optimal job sequence with a little effort. This study is to examine the effect of sampling job sequencing which can select the good job of 0.01%~5% upper good group. The result shows that there is the sets of 0.05%~23% job sequence group which has the same amount of performance measure with the optimal job sequence in the case of experiment of N/M/G/$F_{max}$. This indicates that the sampling job sequencing method is a useful job sequencing method to find the optimal or good job sequence with consuming a small amount of time. The results of ANOVA show that the only one factor, number of machines is the significant factor for determining the job sequence at ${\alpha}=0.01$. It takes about 10 minutes to compare the number of 10,000 samples of job sequence by personal computer and it is proved that the selection rate of the same job sequence with optimal job sequence is 23.0%, 3.9% and 0.065% in the case of 2 machines, 3 machines and 4 machines, respectively. The area of application can readily be extended to the other work condition.

• 골판지포장물류
• /
• 제2권6호
• /
• pp.129-132
• /
• 1995