• 한국건설관리학회논문집
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• 제5권1호
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• pp.114-123
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• 2004

Contract time determination for highway construction projects has never been easy despite considerable research efforts from academia as well as industry. High variations in crew production rates are considered one of the main barriers to accurate contract time determination. This paper presents a methodology for collecting field information on crew production rates which will help to enhance the accuracy of contract time determination for highway bridge construction. Based on a standard data collection tool developed, data on field crew production rates was collected from 14 on going projects in Texas, USA, over the past two years. The production rates based on the data collected were considered by industry practitioners to be more realistic and practical than those available to the current practices. As more data becomes available, key drivers influencing production rates could be identified and provide site personnel with a means to better plan and control production in a project specific context.

• 한국경영과학회:학술대회논문집
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• 대한산업공학회/한국경영과학회 2000년도 춘계공동학술대회 논문집
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• pp.613-616
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• 2000

This paper considers the problem of subway crew scheduling. Crew scheduling is concerned with finding a minimum number of assignments of crews to a given timetable satisfying various restrictions. Traditionally, crew scheduling problem has been formulated as a set covering or set partitioning problem possessing exponentially many variables, but even the LP relaxation of the problem is hard to solve due to the exponential number of variables. In this paper, we propose two basic techniques that solve the problem in a reasonable time, though the optimality of the solution is not guaranteed. To reduce the number of variables, we adopt column-generation technique. We could develop an algorithm that solves column-generation problem in polynomial time. In addition, the integrality of the solution is accomplished by variable-fixing technique. Computational results show column-generation makes the problem of treatable size, and variable fixing enables us to solve LP relaxation in shorter time without a considerable increase in the optimal value. Finally, we were able to obtain an integer optimal solution of a real instance within a reasonable time.

• 품질경영학회지
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• 제15권1호
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• pp.76-81
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• 1987

Past treatment of the single machine maintenance problem has shown that preventive maintenance may be desirable for equipment for which failures are caused at least partially by wear-out factors. In all previous treatment, however, the size of the maintenance-repair crew has been held constant and the optimal maintenance period has then been determined. This paper suggests a simultaneous solution for the maintenance-repair crew size and the optimal maintenance period. The optimal maintenance period is seen to shift as the size of the maintenance-repair crew varies.

• 한국항공운항학회지
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• 제28권1호
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• pp.1-6
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• 2020

The purpose of this study is to analyze the radiation dose data of the space crew of the flight crew and to present a plan for the health management of the flight crew on the basis of the analysis. The analysis show that the average exposure dose of the flight attendants continued to rise, and the exposure dose of the flight attendants was five(5) times higher than that of the radiation workers. As a way to reduce the effects of cosmic radiation, this paper suggests appropriate personnel allocation by model, balanced allocation of high and low latitude routes by crew according to the aircraft type, and a low altitude flight plan for high latitude flight. This study will help aviation crew members understand cosmic radiation and trust in the company's policies. In the future, it will be necessary to enhance the flight safety of the crew by deriving meaningful results by analyzing data related to cosmic radiation of various routes.

• 수산해양교육연구
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• 제28권6호
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• pp.1651-1661
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• 2016

The purpose of this study is to draw up a plan for improving working conditions of distant water fishing vessel crew in order to revitalize the declining distant water fishing industry. Land-based employment has increased as the result of industrialization, which in turn created shortage in marine crew supply for distant water fishing vessels. Pressure on increasing wages for sea farers is put on the industry for this reason, making the labour market in the distant water fishing industry tougher and tighter. Multiple issues have yet to be addressed for distant water fishing vessel crew. They suffer from excessive work compared to other industries. Crew management is another issue, as sea farers face poor labour conditions, working on board vessels in a collective way where no autonomous actions are allowed. Other issues include unqualified crew supply, increasing ratio of labour costs for crew to sales, and intensified implications of labour unions, which are as well making crew supply difficult as a whole. To this end, more well-qualified workers should take part in production operations in the distant water fishery. Both wage increase and working condition improvement should be achieved in order to strengthen motivation towards qualified sea farers. Sustainable crew supply can be achieved when working environments, gender-based working conditions, welfare are prioritized and improved as a whole.

• 대한산업공학회지
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• 제35권2호
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• pp.178-184
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• 2009

The Nuclear Power Plant(NPP) industry in Korea has been making efforts to reduce the human errors which have largely contributed to about 150 nuclear reactor trips since 2001. Recently, the Crew Resource Management(CRM) training has risen as an alternative countermeasure against the nuclear reactor trips caused by human errors. The effectiveness of CRM training in NPP industry, however, has not been proven to be significant yet. In this study a return on investment(ROI) model is developed to measure the effectiveness of CRM training for the operators in Korean NPP. The model consists of mathematical expressions including multiple variables affecting the CRM training impacts and nuclear reactor trips. Implication of the model is discussed further in detail.

• 품질경영학회지
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• 제50권3호
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• pp.441-457
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• 2022

Purpose: The purpose of this study is to analyze the effect of self-leadership on self-efficacy and customer orientation and to verify whether there is a mediating effect of self-efficy on the relationship between self-leadership and customer orientation. Methods: To verify these research problems, the subjects of this study were a total of 300 Korean cabin crew members working for domestic and foreign airlines who received distributed questionnaires and 247 copies wee analysed using the SPSS 20.0 program. Results: First, it can be seen that the self-leadership of airline cabin crew has a significant positive (+) effect on self-efficacy, indicating that self-leadership has a positive effect on the self-efficacy of the members of the organization. Second, it was found that self-efficacy had a positive (+) effect on the customer orientation of airline cabin crew, and it was analyzed that self-efficacy played a partial mediating role in the relationship between self-leadership and customer orientation. Third, it was found that self-leadership had a positive (+) effect on customer orientation, and it was proved that behavior-oriented strategy, constructive accident pattern, and natural compensation strategy, which are three sub-factors of self-leadership of cabin crew, have an influence on customer orientation. Conclusion: based on these findings, the theoretical and practical implications of this study and directions for future research were presented.

• 수산경영론집
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• 제31권1호
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• pp.73-93
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• 2000

This study analyzed and mutually compared the fishery manpower problems in Northeast Asia region including Korea, China, Japan by fishery industry structure, fishery education, fishery manpower and presented fishery cooperative schemes of Northeast Asia. In case of fishery manpower problems, China is still in a better situation whereas Korea and Japan have a hard time of a labor shortage. Korean companies have employed foreign crews to find a way out of the difficulties and the foreign crew rate is growing but the problem is that the reduction of Korean crew could deteriorate the safety of vessel-sailing, efficient operations, and fishery efficiency. Therefore crew management should be placed focus on improvement of working conditions and guarantee positions to foreign crew as assistants in fishery surroundings and systems. Fishery manpower problems are complementary to each nation in Northeast Asia. In consideration of this fact, fishery manpower management needs the mutual fishery manpower and information exchange and for the sake of it, the most urgent task is to build up the international fishery cooperative network through establishing fishery-related information systems of Northeast Asia.

• 한국항해항만학회지
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• 제42권4호
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• pp.299-310
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• 2018

이 연구는 선원의 개인적 특성(연령, 결혼여부, 국적)과 승선 경력(총승선기간, 현회사 승선기간, 선내 근무부서와 직급), 승선근무 보상(선원 복지후생만족도), 승선근무 내성(이가정성 및 이사회성) 그리고 외국인 선원과의 혼승 문제(이문화 수용 및 적응) 등의 승선근무 특성들에 따라 선원직업의식 수준에 어떠한 차이가 있는지를 분석하였다. 분석결과, 선원의 연령이 높을수록, 기혼집단보다 미혼집단에서, 국적은 필리핀, 인도네시아, 미얀마, 중국, 한국 순으로 직업의식 수준이 낮아지는 것으로 나타났다. 선내 직급에서는 외국인 선원의 직장급 부원의 직업의식이 원직급 부원과 수직급 부원 그리고 3항 기사 직급보다 높게 나타났다. 승선근무 특성에서는 복지후생만족도가 높아지면 선원직업의식이 높아지며, 이가정성과 이사회성은 선원직업의식에 부(-)의 영향을 미치는 것으로 나타났다. 외국인 선원과의 혼승에 따른 이문화 수용성은 선원직업의식에 통계적으로 유의한 영향을 미치지 않지만, 이문화 적응성은 통계적으로 유의한 영향을 미치는 것으로 나타났다. 이 연구는 선원들이 자신의 직업에 대한 매력과 자부심 및 긍지를 가지고 승선근무를 지속할 수 있도록 하는 선원직업의식의 중요성을 강조하고, 선원직업의식의 제고방안을 제시하는 데에 기여할 수 있을 것이다.

• 항공우주시스템공학회지
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• 제7권3호
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• pp.45-50
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• 2013

This is a research report about the method of how to maintain qualification of certification flight test crews. KCA(Korea Certification Agency) have completed the KC-100 airplane certification flight tests which is the first time experienced flight tests operation. After the certification flight test, it has been found that annual flying time requirement of 100 hours to the certification flight test pilot is too strict, and other several requirements to maintain the qualification of the certification test crew such as aircraft certification introduction training, initial flight test pilot and flight test engineer certification training, crew resource management training, aviation physiology training, and survival training was difficult to implement in Korean civil aviation environments. In this study, it was suggested that 30 hours of flying time for maintaining certification flight test pilot qualification could be applied to contribute for safe operation of certification flight test and the other training requirements of the certification flight test crew could be fulfilled using self made training courses, existing FAA training courses and Korean Air Force training resources. Therefore, it is recommended that the regulation of maintaining the certification flight test crew qualification should be refined to implement the requirement practically.