• Journal of Advanced Marine Engineering and Technology
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• 제31권3호
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• pp.215-223
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• 2007

When the propulsion shafting system of marine diesel engine is designed. the vibratory stresses on shafts should be reviewed and be satisfied with limits which are laid down by classification societies In addition. the torsional vibration aspects for crankshaft of main engine are requested to be checked by engine designers. Especially. for the 4, 5, and 6-cylinder engines. the 2nd order moment compensator(s) may be installed to compensate the external moments of engine and not to excite the hull girder vibration. This moment compensator which is mounted on fore and/or after-end of engine is driven by the roller chain drive for some of MAN 2-stroke diesel engines. While the engine is running, the roller chain Is worn down, which causes the extension of roller chain. The chain therefore should be checked and tightened by periods in order to keep its functionality. However. when the torsional angular acceleration of chain drive exceeds the certain limit. the chain will suffer the excessive slack and transverse vibration. This may cause fatigue, wear or damage on the chain and the chain ultimately may be broken. The research object of this thesis is to review factors which affect the angular acceleration of chain drive and to find out how to decrease the angular acceleration of driving chain by checking factors which have a major contribution to acceleration reduction using the statistical method of DOE(design of experiment), correlation analysis and regression analysis methods.

• 한국시스템다이내믹스연구
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• 제13권1호
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• pp.81-112
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• 2012

This study investigate the impact of supply chain contracts on supply chain performance. This study employed Price adjustment contract(PAC) and Quantity adjustment contract(QAC) as two main types of a vertical coordination mechanism. We simulate different types of coordination mechanisms with various degrees of demand uncertainties and several capacity tightness scenarios. This study shows that PAC and QAC significantly enhance the supply chain profits and fill rates suggesting that supply chain performance can be improved by implementing a proper coordination mechanism depends on the level of a capacity tightness and demand uncertainty.

• 한국정보시스템학회:학술대회논문집
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• 한국정보시스템학회 2004년도 춘계학술대회
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• pp.138-149
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• 2004

In this research we present a new model, PLCM(Cort-Logistics Chain Management), which can cooperate each other in the port-logistic industry that occupy a heavy rain in the Northeast Asian economy. PLCM(Port-Logistics Chain Management) synthetically manages the logistic chain and information laying stress on the port. Unlike SCM, which hat a vertical relationship between the main groups to cooperate each other, PLCM has a horizontal relationchip between the ports to achieve common purpose and to improve their whole competitive power. In this research we present a concept of PLCM and a specific plan to develop a system for PLCM targetting Pusan, Shanghai, and Tokyo Port which occupy a heavy rain in the Northeast Asian port industry. This system is composed of integrated information system and EDI document exchange system according to the special quality of user's request information. And in order to prove its feasibility and validity, the case study sailing from Shanghai to Busan has been applied to this study.

• 통상정보연구
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• 제11권1호
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• pp.201-218
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• 2009

This paper examined the supply chain management partnerships factors and business performance in Korean industry. As SCM got evolved, the importance of partnership and relationship among the SC members are increased. we should consider the following critical factors such as lead-time reduction, embedness, trust. The purpose of this study is to focus on partnership factors and flexibility to clarify with the Partnering experience which of the SCM factors contribute to business performance for the SCM firms. Based on the analysis of seventy cases, the following results were found. First, SCM operational factors of supply chain management have a positively significant influence on flexibility of supply chain management. Second, partnerships experience factors of supply chain management have a positively significant influence on flexibility of supply chain management. This study suggests that partnerships are main factors for the business performance. Especially, our empirical evidence shows that partnership experience can improve the influence on SCM operational factors and business performance.

• 통상정보연구
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• 제10권3호
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• pp.221-238
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• 2008

This paper examined the supply chain management partnerships factors and business performance in textile industry. To build a global network, we should consider the following critical factors such as lead-time reduction, information sharing, and inventory management. The purpose of this study is to focus on QR (Quick Response) of SCM in textile industries to clarify which of the SCM factors contribute to business performance for the SCM firms. Based on the analysis of eighth-six cases, the following results were found. First, partnerships factors of supply chain management have a positively significant influence on responsiveness of supply chain management. Second, partnerships factors of supply chain management have a positively significant influence on flexibility of supply chain management. This study suggests that partnerships are main factors for the business performance. Especially, our empirical evidence shows that capacity of firms practicing SCM, information techniques, and partnerships make the firms' business performance more responsive and flexible.

• 한국막학회:학술대회논문집
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• 한국막학회 1998년도 심포지움시리즈 Jan-98 역삼투용 분리막 기술 및 응용
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• pp.31-55
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• 1998

1. Performance of RO membrane depends on chain structure (packing density) 2. Crosslinking of main chain is essential for the high performance RO membranes 3. Various bisphenols and polyaminostyrene can be promising materials for the fabrication of RO membranes. 4. By using of blend technique of reactant, we can expect broad spectrum of RO membrane and synergetic effects in membrane performance.

• 한국융합학회논문지
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• 제9권11호
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• pp.291-297
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• 2018

의료 현장에서의 최소침습수술(MIS)의 어려움 때문에 시뮬레이터 훈련이 활발히 연구되고 있다. 이를 위해 본 연구에서는 S-chain모델을 사용하여 가상 장기와 변형과정을 표현하고 반발력 제공이 가능한 햅틱 시뮬레이터를 개발하고자 한다. S-chain알고리즘의 주요 원리는 반발력이 체인 요소의 수에 비례하는 것이며, 대상인 장기의 변형이 클수록 많은 계산시간을 요구한다. 이에 본 연구에서는 계산속도가 개선된 S-chain알고리즘을 회전움직임에 적용하여 제어성능을 평가하였다. 본 연구에서는 자기 점성 점성(MR) 유체를 사용하는 햅틱 마스터 시스템을 제안하고 S-chain모델을 개발한다. 결과적으로, 이 S-chain모델을 사용하여 가상의 장기와 실제 마스터 장치를 결합함으로써 반발력과 수술로봇의 좌표 위치를 서로 전달하는 햅틱 시스템을 구축하여, 햅틱 시뮬레이터의 제어 성능을 실험을 통해 평가하였다.

• 유통과학연구
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• 제21권5호
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• pp.83-91
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• 2023

Purpose: Increasing their motivation and job satisfaction, employees in the distribution channel may be better able to interact with consumers and provide a more satisfying experience. Thus, increasing employee engagement in the supply chain necessitates a complex strategy considering the distinctive features of wholesale and retail markets. This study investigates how to boost employees' motivation in the supply chain based on the difference between wholesale and retail market. Research design, data, and methodology: The prior study analysis is a useful tool to take a look at relevant previous works via a significant screening and selecting strategy. The Key words based on the topic of the research have used, such as 'Employee Motivation', 'Supply Chain', 'Wholesale' and 'Retail' worker. Results: The findings of this research strongly indicates that motivating employees is essential for the efficient operation of supply chain activities as they continue to expand and become more complicated. The supply chain's two main segments are the wholesale and retail markets, each with distinct characteristics. Conclusions: This research focused exclusively on the factors that motivate supply chain workers, ignoring job satisfaction, corporate culture, and managerial style, which may affect employee motivation. These factors also have the potential to impact employee motivation and should be considered in subsequent research.

• 무역상무연구
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• 제42권
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• pp.247-274
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• 2009

The supply chain security programs are designed to prevent terrorist attacks on world transit system, and to help protect the passengers and workers who use these systems on a daily basis. as evidenced by the train bombings in London and Madrid in recent years, the threats to America's transit systems are real. After 9 11 terrors in 2001, security problem is appearing to every nations and international organizations main pending issue than any problem and various countermeasure is prepared. Security is the major issue in international trade, with significant potential costs and economic impact. So, We need to ensure that supply chain security does not become a new non-tariffs barrier. The aim of this study is to examine the international maritime and aviation law on the supply chain security. Also I review the supply chain security in U.S. and other countries.

• Composites Research
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• 제17권6호
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• pp.44-51
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• 2004

에폭시 경화계에서 말단 관능기가 같은 선형아민 경화제의 주쇄에 포함된 에틸기에 결합된 질소원자 개수가 반응특성 및 열적, 기계적특성에 미치는 영향을 알아보기 위하여, 빈용 에폭시수지인 DCEBF (diglycidyl ether of bisphenol F)를 DETA (diethylenetriamine), TETA (triethylenetetraamine) 그리고 TEPA (tetraethylenepentaamine)와 1:1 당량비로 경화하였다. 이 연구에서 DGEBF/아민계에서 경화제 주쇄의 질소원자 거수에 의하여 반응특성 및 열적성질, 기계적특성에 중대하게 영향을 미쳤다. 즉, 주쇄의 질소원자 개수가 작을수록 반응열이 많고 최대발열온도가 낮아졌다. 경화물의 경우 밀도와 최대반응전환률은 주쇄의 질소원자 개수와는 큰 관계가 없으나, 굴곡탄성률과 인장탄성률은 주쇄의 질소원자 개수가 작을 수록 크다. 그 외의 열안정성, 부피수축률(%), 유리전이온도, 인장강도, 굴곡강도는 주쇄의 질소원자 개수와는 일견 무관한 불규칙한 경향을 보인다. 이는 최대반응전환률(%)의 차이가 이러한 특성에 영향을 미치는 것을 나타낸다.