• 경영과정보연구
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• 제32권4호
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• pp.27-51
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• 2013

본 연구는 윤리적 리더십이 중요해 짐에 따라 윤리적 리더십에 영향을 주는 윤리풍토와 윤리적 리더십에 따른 조직시민행동에 대한 연구이다. 이를 연구함으로써 조직시민행동에 미치는 영향인 이타주의, 양심적 행동, 스포츠맨십에 대해 영향을 미치는 요인을 찾아 조직시민행동을 촉진 할 수 있는 기초자료를 제공하고자 한다. 윤리적 풍토는 이기주의, 원칙주의, 공리주의로 구분하였고, 윤리적 리더십은 분배적 공정성, 절차적 공정성, 투명성, 공헌성, 정직성으로 구분하였고, 조직시민행동은 이타주의, 양심적 행동, 스포츠맨십으로 구분하였다. 연구결과 윤리풍토와 윤리적 리더십에 대한 영향관계를 살펴본 결과 공리주의는 분배적 공정성, 투명성 영향을 주었고, 원칙주의, 공리주의는 절차적 공정성, 공헌성, 정직성에 정(+)의 영향을 주는 것으로 나타났다. 또한, 윤리적 리더십과 조직시민행동에 대한 영향관계를 살펴본 결과 투명성은 이타주의와 양심적 행동에 영향을 미치는 것을 알 수 있는데, 투명성은 이타주의에 부(-)의 영향을, 양심적 행동에는 정(+)의 영향을 주었고, 정직성이 스포츠맨십에 대한 영향도 정(+)의 영향을 주는 것을 알 수 있다.

• 한국항해항만학회지
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• 제46권6호
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• pp.554-561
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• 2022

자율운항선박 관련 기술개발이 전 세계적으로 활발히 진행되고 있다. 그러나, 통신, 사이버 보안, 긴급대처능력 등 기술적으로 해결되지 못한 문제들이 아직 많이 남아있기 때문에, 자율운항선박이 상용화되기까지는 많은 시간이 필요할 것으로 예상된다. 이 연구에서는 기술적으로 완전하지 않은 자율운항선박의 대체 방안으로 한 척의 리더 선박과 여러 척의 추종 선박을 하나의 그룹으로 묶어 항해하는 선박 그룹항해시스템을 제안한다. 이 시스템에서는 리더 선박이 항행을 개시하면 추종 선박은 리더 선박의 항행 경로를 자율적으로 추종하며, 경로 추종을 위해 PD 제어를 적용하였다. 또한, 각 선박들은 충돌방지를 위해 안전거리를 유지하면서 일직선 형태로 항해한다. 선박 간의 안전거리유지는 속력 제어를 통해 구현된다. 선박 그룹항해시스템의 유효성을 검증하기 위해 시뮬레이션을 수행하였다. 시뮬레이션에 사용된 선박은 관련 데이터가 공개되어 있는 KVLCC2의 L-7 모델이며, 선박조종운동에는 일본조선학회에서 제안한 MMG standard method를 사용하였다. 시뮬레이션 결과, 리더 선박은 미리 정해진 항로를 따라 항해하였으며, 추종 선박은 리더 선박의 경로를 따라 항해하였다. 세 척의 선박은 시뮬레이션 중 일직선 형태를 유지하였으며, 선박 간 안전거리를 유지하는 것으로 나타났다. 이 연구에서 제안하는 선박 그룹항해시스템은 자율운항선박의 문제점들을 해소하는 항행시스템으로 활용될 수 있을 것으로 기대된다.

• 수산해양기술연구
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• 제56권3호
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• pp.238-245
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• 2020

In this study, a motion control problem for the vessel towed by towing ship on the sea is considered. The towed vessel does not have self-control capabilities such that its course stability totally depends on the towing ship. Especially, in the narrow canal, river and congested harbor area, extreme tension is required during the towing operation. The authors, therefore, propose a new control system design method in which the rudder is activated to provide its maneuverability. Based on the leader following system configuration, a nonlinear mathematical model is derived and a backstepping control is designed. By experiment results with nonlinear control framework, the usefulness and effectiveness of the proposed strategy are presented.

• 한국항해항만학회지
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• 제47권2호
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• pp.49-56
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• 2023

As interest in autonomous ships continues to grow, researchers around the world are dedicating themselves to the development of relevant technologies. However, these technologies are not yet perfect. Several technical problems remain unresolved. To address these problems, this study presents the implementation of a ship trajectory algorithm for group navigation, where followers can navigate by following the trajectory of a leader. The algorithm works by storing the leader's trajectory as a follow-point and by calculating the azimuth using the line-of-sight guidance law to reach it. A course-keeping controller based on PD control is implemented to follow the target course and a speed control algorithm is designed to prevent collisions. Sea experiments were conducted using 1 m class small RC model boats to verify the proposed algorithm. The follower successfully navigated by following the leader's trajectory and maintained the designated distance to the forward boat. This study is significant in that it implements an algorithm for the follower to follow the trajectory of the leader rather than directly following it as in conventional methods, and verifies it through sea experiments.

• International Journal of Naval Architecture and Ocean Engineering
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• 제12권1호
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• pp.943-956
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• 2020

In this study, the motion control problem of the vessel towed by a towing ship (tugboat) is considered. The non-powered towed ship is dragged by the towing ship. Even though the towed ship is equipped with propulsion systems, they cannot be used at low or constant speeds due to safety issues. In narrow canals, rivers, and busy harbor areas especially, where extreme tension is required during towing operation, the course stability of the towed vessel depends on the towing ship. Therefore, the authors propose a new control strategy in which the rudder system of the towed vessel is activated to provide its maneuverability. Based on the leader-follower system configuration, a nonlinear mathematical model is derived and a back-stepping control is designed. By simulation and experiment results with a comparison study, the usefulness and effectiveness of the proposed strategy are validated.

• 수산해양교육연구
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• 제24권6호
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• pp.862-871
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• 2012

The purpose of this paper is to find out the applicability of relationship marketing concept in a professional ship management context primarily on ship management service business. The dramatic growth in ship management industry leads to the intensified competition among professional ship management companies in the world. Thus they have tried to find out ways of ensuring competitiveness to be a market leader in this industry. The fundamental base of marketing is that it involves exchanges. Professional ship management involves a series of transactions and exchanges between client and ship manager. Ship management companies will ensure competitiveness by applying the concept of relationship marketing to real practices.

• Journal of Sport and Applied Science
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• 제5권3호
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• pp.1-5
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• 2021

Purpose: The purpose of this study is to examine the relationship between the leadership style and performance of university athletes' leaders. Research design, data, and methodology: This study utilizes survey items constructed by reserach variables. Data were collected from college athletes of universities in Seoul and Gyeonggi-do, where sports teams are located. A convenient sampling method was used of non-probability sampling methods. A total of 314 responses were computed at statistic program, spss version 21.0. In specific, the study employed correlation, exploary factor analysis, mulple-regressions to test the effects of ledership types on performance. Results: As a result of an empirical analysis to examine the relationship between the leader's leader-ship style and the athletic performance of college athletes, it was found that the leader's leadership style had a significant effect on the college athletes' performance. Conclusions: A leader's leadership style is a very important factor for college athletes who enter the professional world after graduating from college. Therefore, coaches maintain a horizontal relationship with the players rather than a vertical one, and if a leadership style suitable for the players is applied, the players' performance will be better, and the development potential of players and teams will increase. Suggestions for future studies were discussed.

• 한국융합학회논문지
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• 제6권6호
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• pp.35-42
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• 2015

본 연구는 치위생(학)과 학생들의 임상수행능력에 영향을 미치는 요인을 파악하고자 부산광역시와 울산광역시 치위생(학)과 학생들을 대상으로 2015년 3월 2일부터 6월 12일까지 설문조사를 실시하여 총 329부가 분석에 사용되었다. 비판적 사고성향은 셀프리더십(r=0.884), 임상실습 만족도(r=0.876), 임상수행능력(r=0.845)과 양의 상관관계를 나타내었고, 셀프리더십과 임상실습 스트레스(r=-0.796)는 음의 상관관계를 나타내었다. 임상수행능력에 영향을 미치는 요인은 비판적 사고성향(p<0.001), 셀프리더십(p<0.01), 임상실습 만족도(p<0.01)순으로 나타났다. 이상의 결과 치위생(학)과 학생들의 임상수행능력에 비판적 사고성향, 셀프리더십, 임상실습 만족도가 영향을 미치는 요인으로 나타나 교육시에 비판적 사고능력과 셀프리더십을 향상시킬 수 있는 교수학습 전략과 교육과정 프로그램이 개발되어야 할 필요가 있다고 생각된다. 나아가 임상실습 만족도를 충족시키고 임상수행능력 정도를 향상시킬 수 있는 보다 체계적이고 융합적인 프로그램 개발에 기초자료로 활용될 것으로 기대된다.

• 한국해양공학회지
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• 제33권5호
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• pp.462-469
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• 2019

In this study, a motion control problem for the vessels towed by tugboats or towing ships on the sea is considered. The towed vessels, such as barge ships, are used for several purposes. Generally, these vessels have no power propulsion system and are towed using ropes and towing vessel (tugboats). The basic mathematical model of the towed vessel in which three active rudders are attached was introduced from a previous study. Owing to the dependency of the motions of the towed vessel to the towing ship, a method is suggested to cope with the undesirable disturbance and improve the tracking performance. For the simulation study, a model of the towed vessel with a towing ship is made, and necessary physical parameters are identified from the experiment. For the defined and linearized model, a control system is designed, and the control performance is also evaluated. A simulation study is conducted and the effectiveness of the proposed control strategy is verified.

• 한국군사과학기술학회지
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• 제25권6호
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• pp.586-595
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• 2022

In this paper, we propose a formation control algorithm for multi-USVs according to COLREGs. First, we applied the Dynamic Window Approach algorithm that can reflect the kinematic characteristics for the path movement of USVs. Then, we propose a virtual structure-based virtual leader-follower method that applies the advantages of leader-follower and virtual structure methods among conventional formation control algorithms for stability. Next, we proposed a collision avoidance algorithm according to all COLREGs when encountering an opposing ship by adding COLREGs situational conditions to the virtual leader, and finally confirmed the feasibility of the proposed method through simulation.