• 한국신재생에너지학회:학술대회논문집
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• 한국신재생에너지학회 2011년도 춘계학술대회 초록집
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• pp.167.2-167.2
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• 2011

Motions in nature, for example ocean wave, has been playing a significant role for generating electricity production in our modern life. This paper presents an innovative approach for electric power conversion of the vast ocean wave energy. Here, a floating-buoy wave energy converter (WEC) using hydrostatic transmission (HST), which is shortened as HSTWEC, is proposed and designed to enhance the wave energy harvesting task during all wave fluctuations. In this HSTWEC structure, the power take-off system (PTO) is a combination of the designed HST circuit and an electric generator to convert mechanical energy generated by ocean wave into electrical energy. Several design concepts of the HSTWEC have been considered in this study for an adequate investigation. Modeling and simulations using MATLAB/Simulink and AMESim are then carried out to evaluate these design concepts to find out the best solution. In addition, an adaptive controller is designed for improving the HSTWEC performance. The effectiveness of the proposed HSTWEC control system is finally proved by numerical simulations.

• 한국소음진동공학회:학술대회논문집
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• 한국소음진동공학회 2002년도 추계학술대회논문집
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• pp.1044-1048
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• 2002

The experimental modal testing has been carried out for the stator of a generator to confirm the vibrational mode shapes and the corresponding natural frequencies. The model of the stator for the vibration analysis was developed and a series of vibration analyses was carried out. And the properties of the solid element were updated to reduce the differences of the natural frequencies between the measured and the analysed. In the vibration anlyses, the axial, radial and circumferential properties of the solid element were separately varied to take into account the orthotropic effect of the laminated structure and to match the primary modes of the stator core which were extracted from the modal testing. After several attempts to match the measured natural frequencies and model shapes, the properties of the stator model were determined. Comparison of the vibration analyses results based on the determined properties showed fairly good coincidence with the measured data.

• 보건행정학회지
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• 제9권3호
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• pp.149-169
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• 1999

A purpose of this study is to understand Platonic View of Health in $\boxDr$Politeia$\boxUl$. Though Plato was not so much a doctor as a philosopher. he had health care of children at heart. He mapped out an ideal type of nation in $\ulcorner$Politeia$\lrcorner$. and he founded a Akademeia in order to realize his dreams. In his course of education. he put emphasis on the problem of health. He extended poetry education for mental health and physical education for physical health. He placed high value on mental health above physical health. and poetry education corresponds to our reading education of today. He perceived that reading had a considerable influence on mental health promotion. According to his assertion, life style, too. had something to do with health condition. To lead a simple. temperate life makes one' health promote, on the other hand, to lead a complicated, intemperate life makes one' health injure. Morever, he approved of a eugenic marriage and the law of jungle. If one is unable to take care of one' health oneself. he would rather die than live. We cannot accept this proposal by general consent. but we cannot be too careful of our health. We can draw out a philosophy of health from Platonic View of Health. For example. the importance of health education. the preference of mental health. the influence of reading education. and responsibility for self-care, etc. We need to establish a philosophy of health scientifically by lasting study of records.

• 한국안광학회지
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• 제15권1호
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• pp.31-38
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• 2010

목적: 본 논문에서는 안경원의 진입 규제 완화에 대한 공정거래위원회 보고서의 문제점과 개선방안들을 다루었다. 방법: 안경업 진입규제완화를 주장하는 공정거래위원회 보고서 각각의 내용을 분석하였다. 결과: 안경사와 안경원의 공급은 현재도 과포화 상태이며, 외국사례의 경우는 우리의 현실과 맞지 않는다. 정책을 실행하기 위해서는 무엇보다도 제도 개선이 선행되어야 한다. 그리고 안경사들과 정부를 다 만족시키기 위해서는 신중을 요하는 균형이 잡힌 조치가 필요하다. 결론: 현 시점에서 규제완화정책을 실행하기에는 시기상조이며, 장기적인 관점에서 보아야 한다.

• 한국정보과학회:학술대회논문집
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• 한국정보과학회 2011년도 한국컴퓨터종합학술대회논문집 Vol.38 No.1(A)
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• pp.302-304
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• 2011

Rule based machine learning techniques are very important in our real world now. We can list out some important application which we can apply rule based machine learning algorithm such as medical data mining, business transaction mining. The different between rules based machine learning and model based machine learning is that model based machine learning out put some models, which often are very difficult to understand by expert or human. But rule based techniques output are the rule sets which is in IF THEN format. For example IF blood pressure=90 and kidney problem=yes then take this drug. By this way, medical doctor can easy modify and update some usable rule. This is the scenario in medical decision support system. Currently, Rough set is one of the most famous theory which can be used for produce the rule. LEM2 is the algorithm use this theory and can produce the small set of rule on the database. In this paper, we present an improvement of LEM2 algorithm which incorporates the variable precision techniques.

• 연구논문집
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• 통권34호
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• pp.79-85
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• 2004

There are several types of life test method for hose assemblies. The two major tests used for hose assemblies are impulse test and burst test. And magnification adjustment of impulse pressure, heating of testing oil and repetitive motions of bending and straightening of testing hose are also performed for accelerating the life. According to the manufacture process of hose and swaging process of fitting, there is a difference in the life of hose assemblies from minimum 7 times to maximum 40 times during the life test in the same functioning condition. Like this, the life test of hose which has a wide scope of life distribution gives a problem that observation should take a long time to find out the existence of the bursting from the beginning of the test to the completion of bursting of hose assemblies. Therefore, this research proposes a process of concentrating on the defective section of hose assemblies and maximizing the life acceleration by giving 'Knockdown stress' to hose assemblies just until before the hose assemblies get out of order.

• 한국대기환경학회지
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• 제28권2호
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• pp.190-202
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• 2012

Emissions of air pollutants and greenhouse gases (GHGs) by aircraft at the Gimhae International Airport (GIA) were investigated using the Emissions and Dispersion Modeling System (EDMS) version 5.1.3. The number of Landing and Take-Off (LTO) at the GIA for aircraft B737 was dominant, accounting for more than 60% of the total LTOs. For air pollutant emissions, CO was the most dominant pollutant by aircraft, followed by $NO_x$, VOCs, $SO_x$, etc. The emissions of CO, $NO_x$, and VOCs in 2009 (and 2010) at the GIA were 974 (968), 447 (433), 118 (122) ton/yr, respectively. The emissions of GHGs such as $CO_2$, $CH_4$, and $N_2O$ in 2009 (and 2010) were 110,795 (111,114), -0.157 (-0.151), and 1,989 (1,998) ton/yr, respectively. The negative number in $CH_4$ emission represents the consumption of atmospheric $CH_4$ in the engine. In addition, the emissions of most air pollutants (except for $PM_{10}$) and GHGs were estimated to be high in Taxi-Out and Climb-Out modes.

• 한국멀티미디어학회논문지
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• 제19권3호
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• pp.603-611
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• 2016

Educational games offer an opportunity to engage and inspire students to take an interest in every subject material in school. The "fun" obtain when playing games become a trigger for the use of games in learning. However, there are doubts whether the players actually learn while they are having fun. Vidyanusa is an Online Mathematics Education Game being developed by Crayonpedia Education Ecosystem in Indonesia. The learning goal of Vidyanusa is to engage junior high school students in learning mathematics. In this paper, we design the Vidyanusa game material Functions and Relations by using Balanced Design Approach. This approach has three models in succession; the Content Model outlines the purpose of the game, the Task Model maps out the mission, and the Evidence Model outlines student measurement. This paper will then discusses the quality of games produced in term of Usability factor for effective results and objective. The measurement of the game was carried out based on International Standard ISO/IEC 9126-1 FDIS about Software Quality Product.

• 수산해양교육연구
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• 제25권2호
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• pp.419-432
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• 2013

This study investigates the actual status of Saturday program operation in Busan and explores the routes for acquiring information about the Saturday program and satisfaction with the program operation with the subjects of middle school students residing in Busan in order to develop efficient operation methods and also find ways to enhance the participation rate of the students. Therefore, with the subjects of 569 first, second, and third graders at 3 middle schools located in Busan, this research investigated the actual status of Saturday program operation in Busan to figure out the participation rate and satisfaction of the Saturday program, efficient operation methods for the Saturday program and ways to encourage participation in the Saturday program. It is needed to install cooperative Saturday program support centers to be operated collaboratively by local autonomous entities and the offices of education afterwards. And it is necessary to figure out which institution should take charge of the Saturday program according to the requests from teachers and students so that the proper institution can secure the budget and manpower and build a system to develop and operate the Saturday program.

• 대한안전경영과학회지
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• 제10권3호
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• pp.35-41
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• 2008

It is a fact that domestic performance art has been sharply progressed but it is focused on only performance quality technique, not on safety of performers and the audience. It is a pity that people's effort to keep safe stage environment have not traced to innovative change, eventually leading to be forced to perform under hazardous condition. This study is to find out and identify that domestic regulation and accident cases are investigated and compared with cases of advanced countries, to verify that performer and the audience are main elements to develop performance art. And it is to show more effective safety measure after pointing out hazardous elements. Research change is limited to review only performance ones of all cultural facilities and to review accident cases from these places to show reasonable safety measures for stage facilities. Operation manager covers almost all of areas such as devices, management, despite a fact that they take charge of stage facilities, illumination, sounds, already. Some conclusions are as follows; 1) performance theatre-related regulations should be established again. domestic safety standards for performance theatre safety should be established. 2) characteristic and purpose of performance place should be clarified at the stage planning and design of them 3) operation expert performance place is required to be trained to cover emergency situation at any time.