• 상하수도학회지
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• 제24권1호
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• pp.63-72
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• 2010

This study aims to make a decision about the rational option for a multipurpose dams development of the Tumen river basin so that the adjoining countries will effectively deal with the chronic problems and fully satisfy the fast growing demand of water and power. It has been thus far investigated that the interests between North Korea and China closely depend on the selected option, and they are not well compatible with each other. These situations are defined in terms of the cooperative two-person nonzero-sum game. The Nash bargaining model is then applied to contemplate the rational option, considering two scenarios of economic growth of the North Korea. After analyzing the model, it was expected that 1) two multipurpose dams must be cooperatively developed, and 2) their benefits should be allocated according to demand of each country. The authors finally suggest that a cooperative organisation be established to effectively manage the dams beyond the border of the countries.

• Journal of Communications and Networks
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• 제18권3호
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• pp.311-319
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• 2016

In this paper, we analyze the spectrum-sensing performance of a cooperative cognitive radio (CR) network consisting of a number of CR nodes and a fusion center (FC). We introduce the "log-average-SNR ratio" that relates the average SNR of the CR-node-FC link and that of the primary-user-CR-node link. Assuming that the FC utilizes the K-out-of-N rule as its decision rule, we derive exact expressions for the sensing gain and the coding gain - parameters used to characterize the CR network performance at the high SNR region. Based on these results, we determine ways to optimize the performance of the CR network.

• 한국통신학회논문지
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• 제41권1호
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• pp.86-88
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• 2016

이전 연구에서 협력 스펙트럼 센싱을 위한 효율적인 보고 채널 전송 방식으로 이차 사용자의 센싱 결정을 융합 센터로 동시에 전달하는 방식이 제안된 바가 있다. 본 논문에서는 이 방식의 보고 채널에 대한 전송 오류를 경감하는 방안을 제시하고, 모의 실험을 통해 그 성능을 평가하고자 한다.

• 대한전기학회:학술대회논문집
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• 대한전기학회 1999년도 하계학술대회 논문집 G
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• pp.3030-3032
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• 1999

This Paper proposes a fuzzy algorithm for cooperative behaviors of multiple autonomous mobile robots. Each robot makes decision of his behavior based on the information obtained by infrared sensors to measure the position and velocities of other robots. The effectiveness of the proposed algorithm is shown by some computer simulation where a group of mobile robots encircles with equi-interval.

• KSII Transactions on Internet and Information Systems (TIIS)
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• 제13권1호
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• pp.52-68
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• 2019

Aiming at the optimal placement of communication relay nodes (OPCRN) problem in manned/unmanned aerial vehicle cooperative engagement system, this paper designed a kind of fully connected broadband backbone communication topology. Firstly, problem description of OPCRN was given. Secondly, based on problem analysis, the element attributes and decision variables were defined, and a bi-level programming model including physical layer and logical layer was established. Thirdly, a hierarchical artificial bee colony (HABC) algorithm was adopted to solve the model. Finally, multiple sets of simulation experiments were carried out to prove the effectiveness and superiority of the algorithm.

• 한국건축시공학회:학술대회논문집
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• 한국건축시공학회 2020년도 가을 학술논문 발표대회
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• pp.8-9
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• 2020

While non-uniform shapes are appearing as an apparent building style recently, most architects predominantly think structure and construction technology should support the designed shape of non-uniform structures determined by the architect. Within such a governance structure of architect's perception, the role of an engineer is emphasized for technical support only. Especially, in making a decision on a structural design and plan, if various and objective reviews are not conducted, the design is very likely to be left only as a drawing even if the design is appropriate for criteria and norms. With the recognition of such problems, the present study attempted to propose an equal cooperative relationship between architects and engineers in designing non-uniform structures in the future.

• 공학교육연구
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• 제14권2호
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• pp.60-67
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• 2011

이 연구는 공학계열과 사회계열 대학생들의 취업스트레스와 진로결정효능감을 분석하기 위한 것이다. 연구대상은 서울과 제주 소재 3개 대학의 대학생 310명(공학계열 164명, 사회계 열 146명)이다. 취업스트레스와 진로결정효능감 검사 결과 대학생들은 전공과 학년에 따라 유의미한 차이를 보였다. 공학계열 학생이 사회계열 학생들보다 취업스트레스가 더 높은 것 으로 나타났다. 학년에 따른 분석 결과 학년이 올라갈수록 취업스트레스가 더 큰 것으로 나타났다. 진로결정효능감은 사회계열 학생들이 높았고, 1학년 학생들이 더 높게 나타났다. 상 관관계 분석에서 취업스트레스와 진로결정효능감은 부적 상관을 보였다. 이 연구의 결과는 대학에서의 진로교육 프로그램이 전공과 학년에 따라 특화되어야 함을 시사한다. 이를 위해 전공교육과 연계된 진로교육과정의 개발이 필요하다고 제언한다.

• 한국콘텐츠학회논문지
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• 제15권12호
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• pp.483-492
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• 2015

본 연구는 부산광역시의 초등학생들을 대상으로 기상분야 교육서비스를 제공하는 사회적협동조합 설립을 가정하고, 첫 해의 성공적 운영을 위해 1년 뒤 예상되는 기대수익을 분석하였다. 수익과 비용에 관련된 12개 변수를 도출하였고, 최적의 기대수익 분석을 위해 의사결정나무를 사용하였다. 수입 관련 변수는 시간당 교육비, 교재가격이다. 비용 측면 변수는 교재제작비, 강사연봉, 강사교육비, 교재개발비, 출장비, 임대료, 운영비이다. 그밖에 교육수요, 학년 수, 강사 수 변수를 추가하여 수입과 지출 변동을 고려한 기대수익 변화를 분석하였다. 그 결과 다소 낮은 수요가 예상되더라도 교재가격과 시간당 교육비를 높이는 것이 기대수익을 높이는데 유리하게 나타났다. 그 이유는 수요가 늘어난 만큼 교재제작비가 증가하게 되는데, 낮아진 교재가격과 교육비로 인해 늘어난 비용을 상쇄할 만큼의 수익을 내지 못했기 때문이다. 사회적협동조합의 공익적 가치를 생각하여 수요증가만을 의식한 가격결정은 지양되어야 할 것이다.

• 수산경영론집
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• 제26권1호
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• pp.79-104
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• 1995

Dividend Policy involves the decision to pay out earnings versus retaining them for reinvestment in the firm, and dividend policy decisions can have either favorable or unfavorable effects on the attainment of firm's objective. This paper is to examine the present status of dividend policy of the Pusan Cooperative Fish Market, and to suggest the optimal dividend policy decisions appropriate for achieving its objective, which is to promote the fishermen's benefits and protect the interest of consumers. There are two types of dividend that the Pusan Cooperative Fish Market pays to the equity owners : (1) dividend on capital and (2) equalized patronage dividend. During'90s, while the rate of dividend on capital ranged from 1.7% to 2.8%, that of equalized patronage dividend ranged from 13.9% to 22.9%. Therefore, the rate of total dividend on capital including revolving funds has been about 20%, which turns out to be much higher than those of companies listed in the stock market. According to the current dividend data, the Pusan Cooperative Fish Market focuses on the equalized patronage dividend and the dividen on capital is the secondary type of dividend. In addition, the interesting feature of equalized patronage dividend is that it is supposed to be reinvested into capital by the Articles of the Fish Market, as soon as the Fish Market pays it to its members. Finally, this paper suggests the rational dividend policy of the Fish Market that is able to help its objective to be achidved more efficiently. The overall direction of the rational dividend policy can be summarized as follows ; (1) The level of cash dividend on capital should be increased enough to reflect the market interest rate. (2) The subsidy of working capital to some member fisheries cooperatives as quasi- dividend should be cut off steadily. (3) The equalized patronage dividend should be replaced by the original patronage dividend whose level is determined by the volume of each member's purchase. (4) In the long-term, it is necessary to improve the system of revolving funds in the way that revoloving funds could serve to complement equity capital for only a fixed time, after which they ard repaid to the members.

• International Journal of Naval Architecture and Ocean Engineering
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• 제10권1호
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• pp.95-102
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• 2018

This paper proposes a dual lifting and its cooperative control system with two different kinds of floating cranes. The Mega-erection and Giga-erection in the ship building are used to handle heavier and wider blocks and modules as ships and off-shore platforms are enlarged. However, there is no equipment to handle such Tera-blocks. In order to overcome the limit on performance of existing floating cranes, the dual lifting is proposed in this research. In the dual lifting, two floating cranes are well-coordinated to add up the lift capabilities of both cranes without any loss such that virtually a single crane is lifting, maneuvering and unloading. Two main constraints for the dual lifting are as follows: First, two barges of floating cranes should be constrained as a rigid body not to cause a relative motion between two barges and main hooks of the two cranes should be controlled as main hooks of a single crane. In order words, it is necessary to develop the cooperative control of two floating cranes in order to sustain a center of gravity of the module and minimize the tilting angle during the lifting and unloading by the two floating cranes. Two floating cranes are handled as a master-slave system. The master crane is able to gather information about all working conditions and make a decision to control the individual hook speed, which communicates the slave crane by TCP/IP. The developed control system has been embedded in the real floating crane systems and the dual lifting has been demonstrated five times at SHI shipyard in 2015. The moving angles of the lifting module are analyzed and verified to be suitable for hoisting control. It is verified that the dual lifting can be applied for many heavier and wider blocks and modules to shorten the construction time of ships and off-shore platforms.