• Journal of Korea Water Resources Association
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• v.46 no.2
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• pp.171-182
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• 2013

This paper presents the application of fuzzy set theory in multi criteria decision making (MCDM). FAHP (Fuzzy Analytic Hierarchy Process) method was used to rank alternatives to find the most reasonable and efficient way of agricultural reservoir water resources assessment. 6 criteria and 10 subcriteria had been identified and compared to secure agricultural water resources. Fuzzy numbers and linguistic variables were presented to address inherently uncertain or imprecise data. Comparison analysis of decision making method was also carried out to find a way of suitable decision making and validity of FAHP was discussed.

• Journal of the Korean Institute of Intelligent Systems
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• v.18 no.2
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• pp.223-229
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• 2008

In this paper. we propose the real-time vision system which judges drowsiness driving based on levels of drivers' fatigue. The proposed system is to prevent traffic accidents by warning the drowsiness and carelessness using face-image analysis and fuzzy logic algorithm. We find the face position and eye areas by using fuzzy skin filter and virtual face model in order to develop the real-time face detection algorithm, and we measure the eye blinking frequency and eye closure duration by using their informations. And then we propose the method for estimating the levels of drivel's fatigue based on measured data by using the fuzzy logic and for deciding whether drowsiness driving is or not. Finally, we show the effectiveness and feasibility of the proposed method through some experiments.

• Journal of Navigation and Port Research
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• v.32 no.6
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• pp.447-452
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• 2008

In this paper, the automatic depth control system and the collision avoidance system of the Manta UUV have been established in vertical and horizontal plane. The PID control theory and the Fuzzy theory are adopted in this system. The 6-DOF MMG model had been established by theoretical calculations and captive model test results. The depth control simulation results have been fully presented. The collision risks of the UUV had calculated by the fuzzy theory with the virtual sonar system. Finally, the automatic depth control system and the collision avoidance simulation system of Manta UUV have been fully developed and simulated.

• Proceedings of the Korea Inteligent Information System Society Conference
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• 1999.10a
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• pp.175-183
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• 1999

국내 무역업무 환경이 EDI 시스템 도입 및 정부의 적극적인 활성화 정책에 힘입어 급속도로 변화하고 있다. 이러한 변화와 함께 EDI 시스템 도입, 활용방법, 성과측정 및 표준화에 대한 연구들이 다각적으로 이루어지고 있다. 이 중에서도 기업에게 있어서 EDI 도입에 따른 성과향상 및 성과측정이라는 이슈는 대단히 중요한 의미를 가질 뿐만 아니라, EDI 시스템 도입의 궁극적인 목표이기도 하다. 이러한 배경하에서 EDI 시스템도입에 따른 기업성과를 향상시키기 위한 EDI 시스템 구현 및 활용방안 등에 대한 기존연구들이 많이 소개되어 있다. 그러나, 실제적으로 EDI 시스템을 활용하면서 시스템에 대한 통제요인의 개발 및 통제요인간의 인과관계 확인과 요인들간의 상관성 조절을 통해서 기업 전체의 성과를 향상시킬 수 있는 EDI 통제모형의 개발에 관한 연구는 부족하다. 따라서, 본 연구에서는 EDI 성과를 향상시킬 수 있는 통제요인 및 이들간의 상관관계를 밝히고, 이를 퍼지인식도 (FCM: Fuzzy Cognitive Map)와 연계하여 효율적으로 EDI 시스템을 통제할 수 있는 통제모형을 제시하고자 한다.

• Journal of the Korea Society of Computer and Information
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• v.6 no.2
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• pp.143-151
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• 2001

The purpose of this study is to present the model for introduction of pharmacy information systems after medical reform. AHP(analytic hierarchy process) method is used to compute preference over factors which are included in the introduction of information systems. The fuzzified mu1ti-objective programming model is given to consider the aspects of resource and to accommodate the aspiration level and satisfaction level of decision makers. Numerical examples illustrating interpolated model are presented to accommodate the uncertainty of priority and the implications of this model is discussed.

• Journal of Korean Society of Coastal and Ocean Engineers
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• v.20 no.5
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• pp.491-497
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• 2008

The effect of wave and current interactions on jet-like current flowing against waves was investigated based on numerical simulations. The numerical simulations were conducted using a model system of REF/DIF(a wave model) and SHORECIRC(a current model). In the simulations, irregular waves refracted due to the jet-like opposing current were focused along the centerline of current, and the jet-like current was spreaded earlier when the wave heights become larger. The numerical results show that the rapid change of wave height distribution in transverse direction near current inlet plays a significant role to spread the jet-like current. In other words, the radiation stress gradients acting in transverse direction have a more significant effect on the jet-like current than its gradients acting in flowing direction which tend to accelerate the current do. In conclusion, it is indispensible to take into account the interaction between waves and current when the jet-like current such as river mouth meets opposing waves.

• Asia-Pacific Journal of Business Venturing and Entrepreneurship
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• v.7 no.2
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• pp.77-90
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• 2012

As the influence of service industry into domestic economy is increasing, it also has been influenced more powerfully at the domestic GDP(Gross Domestic Product) relative importance and employment relative importance continuously. By means of these reason, the Korean government announced the synthetic countermeasure for strengthening the competitive power of service industry in December, 2006. After then, it announced phase I of 'service industry advancing plan' which is concrete execution plan in April, 2008. Also, it is announced to announce phase II plans in september, 2008 and phase III plan in December, 2008 additionally. Service quality is the most powerful competitive means at service marketing and a key point for improving service productivity. The improvement of service quality has considerable influence on survival and profitability of service industry. Therefore, the study of objective service quality measurement in service industry is very important issue. The purpose of this study is to suggest a measurement model of service quality using fuzzy theory and AHP which measuring service quality objectively in subjective environment. It is expected that this study will help the improvement of competition power of service industry as well as establishment of effective decision-making.

• Korean Journal of Social Welfare
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• v.69 no.3
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• pp.289-315
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• 2017

Debate on basic income expanded worldwide as well as in South Korea. However, the expansion of these discussion has led to vigorous arguments for and against the various claims of basic income. In order to introduce basic income in Korea, discussing on the picture of Korean welfare state which includes basic income is important. In this study, 'Ideal Model of Korean Basic Income (and Welfare State)'is discussed and theoretically constructed using fuzzy-set ideal type approach, and feasible paths in realizing Korean basic income are suggested. This study attempts to contribute to a practical discussion on taking feasible and reasonable path to realize full basic income in Korean welfare state.

• Proceedings of the KIEE Conference
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• 2011.07a
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• pp.608-609
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• 2011

전력수요 예측 오차가 큰 추석 연휴 및 전, 후일 전력수요 예측의 정확성을 향상시키기 위해 과거 추석 연휴 및 전, 후일에 대한 전력수요 특성을 분석하고 최대/최소 전력 예측을 위한 퍼지 입력데이터 선정 방법과 24시간 예측을 위한 정규화에 필요한 입력 데이터 선정방법을 개발하여 퍼지 선형회귀분석 모델을 사용하여 2006년에서 2010년까지 5개년의 사례연구를 통해 알고리즘의 우수성을 검증하였다.

• Journal of the Korea Safety Management & Science
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• v.4 no.1
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• pp.37-47
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• 2002

Risk analysis is a formal deductive procedure for determining combinations of component failures and human errors that could result in the occurrence of specified undesired events at the system level. This method can be used to analyze the vast majority of industrial system reliability problems. This study deals with the application of knowledge-engineering and a methodology for the assessment ＆ measurement of reliability, availability, maintainability, and safety of industrial systems using FTA(fault tree analysis), A fuzzy methodology for fault-tree evaluation seems to be an alternative solution to overcome the drawbacks of the conventional approach (insufficient Information concerning the relative frequencies of hazard events). To improve the quality of results, the membership functions must be approximated based on heuristic considerations, The purpose of this study is to describe the knowledge engineering approach, directed to integrate the various sources of knowledge involved in a FTA.