• Management & Information Systems Review
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• v.32 no.4
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• pp.27-51
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• 2013

The present study focuses on ethical leader ship of people who are member of organization. The survey was conducted to 209 spectators who participated in the corporate organization. Collected data were analyzed through the statistical and analysis program SPSS. Correlation analysis and multiple regression analysis were conducted for analyzing the influence of ethical work climates on ethical leader ship and organizational citizenship Behavior. The results are below. First, the result of analyzing the relationship between ethical work climates and Ethical leader ship shows that principle have a positive impact on distributive justice, procedural justice, transparency, contribution, integrity and benevolence have a positive impact on procedural justice, contribution, integrity. Second, the result of analyzing the relationship between ethical leader ship and organizational citizenship behavior shows that transparency has a positive impact on conscientiousness, and integrity has a positive impact on sportsman ship. We discuss the implications of the results for the theory and the future research on the ethical leader ship.

• Journal of Navigation and Port Research
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• v.46 no.6
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• pp.554-561
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• 2022

Technology development related to maritime autonomous surface ships (MASS) is actively progressing around the world. However, since there are still many technically unresolved problems such as communication, cybersecurity, and emergency response capabilities, it is expected that it will take a lot of time for MASS to be commercialized. In this study, we proposed a ship group navigation system in which one leader ship and several follower ship are grouped into one group. In this system, when the leader ship begins to navigate, the follower ship autonomously follows the path of the leader ship. For path following, PD (proportional-derivative) control is applied. In addition, each ship navigates in a straight line shape while maintaining a safe distance to prevent collisions. Speed control was implemented to maintain a safe distance between ships. Simulations were performed to verify the ship group navigation system. The ship used in the simulation is the L-7 model of KVLCC2, which has related data disclosed. And the MMG (Maneuvering Modeling Group) standard method proposed by the Japan Society of Naval Architects and Ocean Engineering (JASNAOE) was used as a model of ship maneuvering motion. As a result of the simulation, the leader ship navigated along a predetermined route, and the follower ship navigated along the leader ship's path. During the simulation, it was found that the three ships maintained a straight line shape and a safe distance between them. The ship group navigation system is expected to be used as a navigation system to solve the problems of MASS.

• Journal of the Korean Society of Fisheries and Ocean Technology
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• v.56 no.3
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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.

• Journal of Navigation and Port Research
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• v.47 no.2
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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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• v.12 no.1
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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.

• Journal of Fisheries and Marine Sciences Education
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• v.24 no.6
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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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• v.5 no.3
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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.

• Journal of the Korea Convergence Society
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• v.6 no.6
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• pp.35-42
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• 2015

This study was done to explore clinical competence and factors related to competence in dental hygiene students. This study performed a survey on such an issue from March 2 to June 12, 2015 for 329 dental hygiene students who were residing in Busan and Ulsan. In the result by the satisfaction of the major, there is the highest score in the satisfaction of the critical thinking, self-leadership, satisfaction in clinical practice and ability of clinical performance. The critical thinking reveals the positive relationship with the self-leader ship(r=0.884) and the ability of clinical performance(r=0.845). Whereas the self-leader ship show the negative relation with stress in clinical practice(r=-0.796). The most important factor affecting on the clinical competence among dental hygiene students was critical thinking(p<0.001), followed by self-leadership(p<0.01) and satisfaction of clinical practice(p<0.01). In results, the critical thinking, the self-leader ship and the satisfaction of clinical practice have an effects on the ability of clinical performance of the dental hygiene students. The teaching learning strategy and the educational programs to enhance the critical thinking and self-leader ship should be developed. Furthermore, the present study can be used as the base data for the systematic and convergence program to improve the satisfaction of clinical practice and the ability of clinical performance.

• Journal of Ocean Engineering and Technology
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• v.33 no.5
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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.

• Journal of the Korea Institute of Military Science and Technology
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• v.25 no.6
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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.