• 한국항해항만학회지
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• 제38권4호
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• pp.357-366
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• 2014

IMO에서는 2003년 12월 제23차 총회에서 'Guidelines on places of refuge for ships in need of assistance'를 총회 결의서 Res. A.949(23)으로 채택하여, IMO 협약국에 선박 피난처를 지정할 것을 권고하고 있다. 선박 피난처란 '원조를 필요로 하는 선박이 선박을 정상상태로 복원하고 항해의 위험을 줄이고 인명이나 환경을 보호하기 위한 장소'라고 IMO에서는 정의하고 있다. 선박 피난처를 지정 운영하는 것은 자국의 연안 환경을 보호하기 위한 국가 정책과 밀접한 관련이 있어, 국가적으로 아주 예민한 문제이다. 그러나 선박 피난처를 지정 운영하는 것은 해양 사고로 인한 2차적 피해의 확산을 방지하여, 환경적 재산적 손실을 최소화 할 수 있다. 현재 외국의 여러 국가에서는 선박 피난처를 지정 운영하고 있다. 그러나 국가별로 선박 피난처 입지 선정 방법 기준이 달랐으며 표준화된 선박 피난처 입지 선정 모델은 없었다. 따라서 본 연구에서는 향후 국내 선박 피난처 제도의 도입 시 합리적이고 효율적인 선박 피난처 입지를 선정하기 위하여, 외국의 선박 피난처 입지 선정 시 고려되었던 요소들을 검토 분석 하였으며, 이러한 고려 요소들의 정성적인 자료를 정량적인 수치로 표현하여 객관적인 지표에 따른 선박 피난처 입지 지정 모델을 제시하고자 한다. 선박 피난처 입지 지정 모델은 선박 해양 개연성 평가, 입지 분석, 지원 시설의 접근성 평가 과정을 통하여 최종 선박 피난처 입지를 제시하였다.

• 한국정밀공학회지
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• 제12권7호
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• pp.123-130
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• 1995

This study presents model synthesis and performance investigation of a new brake system using electro-rheological(ER) fluids. Field-dependent Bingham properties characterized by non-zero yield stresses of the ER fluids are experimentally distilled. These properties are then incorporated with the governing equation of the proposed brake system which features design simplicity, fast response and salient controllability. After analyzing system performance with respect to design parameters such as electrode gap and length, an appropriate size of the brake is designed and fabricated. Both simulation and experimental works are undertaken in order to determine the feasibility and efficiency of the proposed brake system. The system performances are justified by evaluating field-dependent braking torques as well as braking times.

• 조명전기설비학회논문지
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• 제25권9호
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• pp.26-32
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• 2011

The object of this paper is to optimize the battery system for supplying stably power in separate house in which a PV-wind hybrid power generation system is applied. In a power system to be used in a stand alone, it is very important to build optimize the electrical storage system and to utilize it for supplying stably output voltage when there is a shortage of the power generation capacity or there is no sunshine, or when power is to be supplied with a load. This paper provides an optimized method to evaluate capacity of battery by analyzing advantages and disadvantages of the existing battery evaluating method being used in each company for supplying stably power in separate house utilizing the new renewable energy such as a light of the sun.

• 한국컴퓨터정보학회논문지
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• 제19권1호
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• pp.119-130
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• 2014

본 논문은 다양한 네트워크를 편리하게 분석할 수 있는 실용적인 유전 알고리즘 기반 경로탐색 시스템인 GAPS를 제안하고자 한다. 이러한 목적을 위해 GAPS는 네트워크 모델링을 위한 직관적인 그래픽 사용자 인터페이스와 모델링 및 탐색 과정에서 발생하는 데이터들을 관리하기 위한 데이터베이스 관리 시스템, 다양한 네트워크를 분석하기 위해 개발된 간단한 유전 알고리즘을 결합하여 개발되었다. 특히, 기존의 유전 알고리즘들이 단락이 많고 두 개 노드 간 실행가능 경로 수가 많지 않은 네트워크를 분석하는데 적합하지 않았던 반면, GAPS는 실행가능 경로와 실행불가능 경로를 모두 적절히 평가할 수 있는 적합도 함수를 사용하는 유전 알고리즘에 기반하고 있어 해 집단의 다양성을 유지하면서 다양한 네트워크들을 분석할 수 있다. 실험결과, GAPS를 통해 단락이 많은 네트워크와 단락이 적은 네트워크를 모두 편리하게 분석할 수 있다는 점과, GAPS가 기존의 경로탐색문제를 위한 유전 알고리즘들과 대비되는 장점을 갖고 있음을 확인할 수 있었다.

• 대한전기학회논문지:전기기기및에너지변환시스템부문B
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• 제52권3호
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• pp.124-132
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• 2003

The goal of this paper is to propose a virtual instrumentation system based on three dimensional current coordinates for monitoring power quality A developed system with various experimental graphic screens and numerical results is made up 586-PC and DSP(digital signal processor) board, power quality analyzing and evaluating software for windows. Power parameters are analyzed using correlation signal processing techniques based on the correlation between voltage and current waveforms. Analysis. results are visualized by 3-D current coordinates, and it Is compared and evaluated with conventional time / frequency domain. To verify the validity of the proposed system, power and harmonic parameters of single phase induction motor drives is analyzed and verified.

• 대한전기학회:학술대회논문집
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• 대한전기학회 2002년도 춘계학술대회 논문집 전기기기 및 에너지변환시스템부문
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• pp.190-197
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• 2002

The goal of this paper is to propose a virtual instrumentation system based on three dimensional current coordinates for monitoring power quality. A developed system with various experimental graphic screens and numerical results is made up 586-PC and DSP(digital signal processor) board, power quality analyzing and evaluating software for windows. Power parameters are analyzed using correlation signal processing techniques based on the correlation between voltage and current waveforms. Analysis results are visualized by 3-D current coordinates, and it is compared and evaluated with conventional time/frequency domain. To verify the validity of the proposed system, power and harmonic parameters of single phase induction motor drive system is analyzed and verified.

• 한국멀티미디어학회논문지
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• 제12권6호
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• pp.804-814
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• 2009

In this paper, a novel system for avatar motion controlling by tracking face is presented. The system is composed of three main parts: firstly, LCS (Local Cluster Searching) method based face feature detection algorithm, secondly, HMM based feature points recognition algorithm, and finally, avatar controlling and animation generation algorithm. In LCS method, face region can be divided into many small piece regions in horizontal and vertical direction. Then the method will judge each cross point that if it is an object point, edge point or the background point. The HMM method will distinguish the mouth, eyes, nose etc. from these feature points. Based on the detected facial feature points, the 3D avatar is controlled by two ways: avatar orientation and animation, the avatar orientation controlling information can be acquired by analyzing facial geometric information; avatar animation can be generated from the face feature points smoothly. And finally for evaluating performance of the developed system, we implement the system on Window XP OS, the results show that the system can have an excellent performance.

• 전기학회논문지
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• 제58권8호
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• pp.1472-1478
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• 2009

The domestic power distribution system is operating in an open loop mode; however, it already has a loop structure. Power distribution systems must be changed for bi-directions power supply for smart networks due to a changing of paradigm in electric power industry. The simplest bi-directions distribution networks can make it closing of normally open switch. However, bi-directions power supply is very difficulty to be operated and there are many parts which it must study. This paper presented various models that are able to change a radial system for loop structures. Further, we compared the reliability index for each model by evaluating the amount of improvement reliability required in radial power distribution system. In addition, we calculated CIC(Customer Interruption Cost) for each model by comparing and analyzing.

• 한국해양공학회지
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• 제26권6호
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• pp.1-6
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• 2012

The purpose of this paper is to present a rational method for analyzing, designing, or evaluating the spread mooring systems used with floating drilling units. This paper presents a validated model to calculate the catenary static configuration. A semi-resolution approach is presented in this paper that is capable of predicting the static performance of a caisson mooring system. The solution is derived as a function of only three parameters, which can be solved numerically by implementing different kinds of boundary conditions. The efficiency and accuracy of the method permit quick parametric studies for the optimal selection of the system particle, which is undoubtedly useful for a preliminary design. A number of numerical examples demonstrate the validity of the adopted approach. The paper contains a complete description of the test cases and reports the results in such a way that it can provide a "benchmark" test for users and programmers of computer codes for flexible riser analysis.

• Journal of Biosystems Engineering
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• 제33권6호
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• pp.446-452
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• 2008

Machine vision system was used for analyzing leaf color disorders of tomato plants in a greenhouse. From the day when a few leave of tomato plants had started to wither, a series of images were captured by 4 times during 14 days. Among several color image spaces, Saturation frame in HSI color space was adequate to eliminate a background and Hue frame was good to detect infected disease area and tomato fruits. The processed image ($G{\sqcup}b^*$ image) by OR operation between G frame in RGB color space and $b^*$ frame in $La^*b^*$ color space was useful for image segmentation of a plant canopy area. This study calculated a ratio of the infected area to the plant canopy and manually analyzed leaf color disorders through an image segmentation for Hue frame of a tomato plant image. For automatically analyzing plant leave disease, this study selected twenty-seven color patches on the calibration bars as the corresponding to leaf color disorders. These selected color patches could represent 97% of the infected area analyzed by the manual method. Using only ten color patches among twenty-seven ones could represent over 85% of the infected area. This paper showed a proposed machine vision system may be effective for evaluating various leaf color disorders of plants growing in a greenhouse.