• 한국의료질향상학회지
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• 제7권2호
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• pp.244-261
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• 2000

Background : In order to cope with changes in the management environment at hospitals, increased interests are drawn in patient foodservice system on Continuous Quality Improvement Activity as the method of approaching a quality food service and effective management. Thus, as a part of this activity, this study was conducted to evaluate job flow improvement that was already performed and the results of that process at the dietetic department of a university hospital, focusing on improving management. Method : On February 15 of 1998. the dietetic department formed a job flow-improvement to decide on the priority of job flow improvement, and prepared specific action strategies and schedule of the priority: after a 5 month process period, job improvement achieved on June 15. 1998. Also, economic achievement of the task was evaluated through labor productivity analysis and cost-benefit analysis. Results : The patient food service system which was managed decentralized at the present hospital was centralized, some steps of the food service process were integrated, and quality of patient food was improved. Also, as a solution of the problems expected when conducting job flow improvement was made on food service equipments and utensils. The result of evaluating the job flow improvement that labor productivity improved by 18.2% compared to before the improvement and the result of the analysis of cost-benefit showed that Benefit-Cost (B/C) ratio was 2.22. showing financial merit on the investment. Conclusions : Continuous Quality Improvement Activity needs to be initiated and conducted in the future in various areas of hospital foodservice system in order to actively adopt to ever changing hospital management environment. In order to achieve this goal, many researches and more efforts need to be put in by people in charge of hospital food service management, and interests and support are needed from hospital policy makers.

• 가정과삶의질연구
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• 제34권4호
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• pp.37-49
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• 2016

The purpose of this study was to examine the mediating effect of inner resilience and external resilience on the relationship between the job stress of early childhood education teachers and their teaching flow. Data were collected through questionnaires from 221 early childhood Korean teachers in the InCheon area. The instruments used in this study were the Kindergarten Teachers' Job Stress Scale, Early Childhood Teachers' Resilience Scale, and Teaching Flow Scale. The data were analyzed by Pearson's correlation analysis, multiple regression analysis, and Baron and Kenny's method. It was adapted to SPSS ver. 18.0 for Windows. This study followed a mediated effect model. First, there was a negative correlation between the job stress and teaching flow. There was a positive correlation between the teaching flow and the resilience. Secondly, there was a negative correlation with job stress and teaching flow in path model 1. In path model 2, there was a positive correlation with resilience and teaching flow. Teaching flow was statistically and significantly influenced by resilience. Thirdly, there was the mediating effect of inner resilience and external resilience on the relationship between the job stress of early childhood education teachers and their teaching flow. These results can be used as the basic data for the improvement of early childhood education teachers' teaching flow in the future.

• 산업공학
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• 제5권1호
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• pp.35-46
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• 1992

This paper deals with analysis of material handling system efficiency of a heat-exchanger manufacturing line. This line is a typical flow shop type assembly line which consists of 10 steps of assembly stations. Each station have one or two workers who assemble and move components for the job, and no special transporters for component's movement. Therfore, all the workers are involoved in unnecessary moving activities which decrease overall production efficiencies of the line. To improve productivities, production outputs and worker's job performances for this assembly line, the several alternatives are considered such as installing new conveyor lines and automatic guided vehicle(AGV) system. Analyzing economic feasibilities and responses of the system alternatives, an experimental simulation model is built suing SIMAN Ver. 3. 5 simulation language with CINEMA package for animation of the process flow. Through this animation process a vivid picturial analysis could performed on the process flow.

• 산업경영시스템학회지
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• 제34권4호
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• pp.82-88
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• 2011

A typical job sequencing problem is studied in this research to improve productivities in manufacturing companies. The problem consists of two-stage parts and assembly processes. Two parts are provided independently each other and then two sequential assembly processes are followed. A new heuristic is developed to solve the new type of sequencing problem. Initial solution is developed in the first stage and then the initial solution is improved in the second stage. In the first stage, a longer part manufacturing time for each job is selected between two, and then a sequence is determined by descending order of the times. This initial sequence is compared with Johnson's sequence obtained from 2-machine assembly times. Any mismatches are tried to switch as one possible alternative and completion time is calculated to determine whether to accept the new sequence or not to replace the current sequence. Searching process stops if no more improvement can be made.

• 한국경영과학회지
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• 제20권1호
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• pp.115-130
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• 1995

This paper considers a single machine nonpreemptive scheduling problem with a given common due date. In the problem, the optimal job sequence is sought to minimize the sum of earliness/tardiness and flow time measures in the situation where all jobs are available at time zero, and weights per unit length of earliness/tardiness and flow time are V and W, respectively. Some dominant solution properties are characterized to deriva both an optimal starting time for an arbitrary sequence and sequence improvement rules. The optimal schedule is found to the case W .geq. V/. By the way, it is difficult to find the optimal schedule for the case W < V. Therefore, the derived properties are put on together to construct a heuristic solution algorithm for the case W < V, and its effectiveness is rated at the mean relative error of about 3% on randomly generated numerical problems.

• 대한안전경영과학회지
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• 제15권4호
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• pp.185-196
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• 2013

Polyurethane is an elastomer polymer, which is flexible, tough and resistant. This material is widely used various fields such as automobile, aeroplane, textiles, construction industries. Currently there exists more than 1,000 manufacturing companies in Korea that are closely related to Polyurethane. In spite of a number of Polyurethane manufacturing companies, there are little attention in academia as well as industries to study the safety and manufacturing process improvement on Polyurethane. In this paper, we consider a case study for the Polyurethane manufacturer to improve productivity by using safety management and manufacturing process reengineering. After careful analysis, we derive three enhancements to increasing the safety and productivity for the target company. Especially, we achieve about 16% productivity improvement in roller manufacturing process by replacing manual stirring job with automated mixing machine.

• 임상간호연구
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• 제15권2호
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• pp.139-155
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• 2009

Purpose: The purpose of this study was to identify role through job analysis (duties and tasks) of nurses who work as clinical nurses with education and clinical nurse with patient coordination within the hospital. Methods: The DACUM committee was organized with 8 nurses each, clinical nurses with education and clinical nurses with coordination. The committee derived the duties and tasks of the two groups of clinical nurses from their actual work in the hospital through a DACUM workshop. Validity of the derived duties and tasks was tested by 12 nurses at each of 3 hospital. Results: For clinical nurse with education, 8 duties and 45 tasks were identified, which included patient education and consultation, patient advocacy, management of the therapeutic process, direct nursing care, activities work directed at improvement, management of health promotion events, administration work, and self-improvement. For clinical nurse with coordination, 10 duties and 54 tasks were identified, and included client consultation, client education, direct nursing care, coordination of therapeutic flow, employee education, public relations with the community, planning and operation of meetings, administration work, work directed at improvement, and self-improvement. Conclusion: The results of this study contribute to not only the work of the participants but also basic data for human resource management in the hospital.

• Journal of Communications and Networks
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• 제6권2호
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• pp.147-155
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• 2004

In this paper, we propose an efficient sequencing technique, namely minimum Row time scheduling (MFTS), to manage variable-Iength message transmissions for single-hop passive starcoupled WDM optical networks. By considering not only the message length but also the state of the receivers and the tuning latency, the proposed protocol can reduce the average delay of the network greatly. This paper also introduces a new channel assignment technique latency minimizing scheduling (LMS), which aims to reduce the scheduling latency. We evaluate the proposed algorithm, using extensive discrete-event simulations, by comparing its performance with shortest job first (SJF) algorithm. We find that significant improvement in average delay could be achieved by MFTS algorithm. By combining the proposed message sequencing technique with the channel selection technique, the performance of the optical network could be further improved.

• 한국산학기술학회논문지
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• 제17권5호
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• pp.305-315
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• 2016

소품종 대량 생산 체제에서 다품종 소량생산 체제로의 변경으로 인해 개별 기업들은 시장 점유율을 지키기 위해서 생산율 극대화, 재공재고의 최소화, 적정 사이클 타임 운영 등 다양한 생산전략을 개발, 이를 적절하게 운영하기 위한 노력을 경주하고 있다. 특히, 복잡한 제조라인의 경우 작업흐름이 특이하고 공정단계가 많으며 매우 복잡한 공정 순서로 인해, 기존의 수리모형이나 대기이론 모형과 같은 분석적 방법을 적용하여 생산전략을 수립하는 데 많은 한계점을 내포하고 있다. 이를 위해 본 논문은 재투입과 병목공정이 혼재된 제조라인을 대상으로 병목공정 앞에서의 자재 투입 통제 문제와 작업장의 생산변경시점 결정 및 배치기계의 배치크기 및 가공순서를 결정하는 휴리스틱 방법을 제안한다. 제안된 방법의 효과를 검증하기 위해 제조환경을 테스트할 수 있는 시뮬레이션 모델을 개발하였으며, 앞서 언급한 세 가지 의사결정 문제에 대해 현재 기업에서 일반적으로 많이 사용되고 있는 기존 방식과 본 연구에서 제안하는 방법들을 비교하는 실험을 하였으며, 실험을 위한 시나리오는 세 가지 의사결정 문제의 휴리스틱 방법을 단일로 적용하는 경우와 휴리스틱 방법을 동시에 적용하는 경우로 나누어 실험하였고, 실험 결과 세 가지 의사결정 규칙을 함께 적용하는 것이 생산율 향상, 사이클 타임 감소, 평균 재공재고 수준 감소에 효과가 있음을 보여주었다.

• 공학교육연구
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• 제10권2호
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• pp.5-18
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• 2007

현장 실습의 목적을 달성하기 위한 가장 큰 주체는 공학교육과 관련된 학과임에도 불구하고, 공학교육의 주체들은 실제 시행 시 제반 문제점들을 이유로 현장실습의 필요성과 교육적 기대효과(성취동기 유발)의 중요성을 받아들이지 못하고 있는 실정이다. 본 연구는 한국과 프랑스의 현장실습의 수행제도를 비교 연구하고 그 문제점을 파악하여 한국 실정에 맞는 순환형 현장실습 제도를 위한 기본 틀을 제시 하고자 한다. 또한 실무능력에 맞는 단계적 기본 모형을 몇 가지 기본 단계로 제시하여 산업 현장에서 재교육 기간을 단축하여 현장으로 투입 될 수 있는 적응력을 갖춘 우수한 인력을 제공 받을 수 있는 현실적이며 미래지향적인 우수 인력을 양성할 수 있는 현장실습 체계를 마련 하고자 하였다. 이에 따라 본 연구에서는 13가지 개선을 위한 실천 체크리스트를 제시하고 순황형 시스템에 맞는 기본 실습 모형을 제시하였다.