• 대한설비공학회지:설비저널
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• 제11권4호
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• pp.6-18
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• 1982

The performance of two typical types of solar hot water heating system was tested in Seoul. Types of systems studied are single-tank internal external heat exchanger system and single-tank internal heat exchanger system. Comparing to experimental results, a transient system simulation program was made to analyze the performance of the selected system. The climate data, Standard Weather Year for Seoul, required for the simulation was provided. Computer simulations were used to estimate the effect of significant parameters upon system performance. The followings are obtained. 1. In the domestic solar water Heating system, the value $20-40kg/m^2\;h$ for flow rate through the collector is much better than the recommended value $72kg/m^2\;h$ in the solar heating system. 2. The effectiveness of collector heat exchanger and storage tank size are found to have only a small effect upon system performance. 3. The hot water draw pattern has a significant effect on system performance. A higher system efficiency achieved when draw-off occurred around noon than when it occurred around early morning. Using the above results, the reference solar hot water system which provides $300\ell$ of hot water per day, was selected as a guide for designer. And simplified graphical method was developed based on the modified f-chart method to determine required collector area. When the system design parameters of the proposed system differs from the reference system, required collector area can be calculated from area adjustment factors.

• 한국조경학회지
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• 제28권2호
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• pp.109-109
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• 2000

This study seeks what kind of factors influence to locate dwellings and to establish scenic spots in nature by a case study focused on a meandering stream. The study specially concentrates on the interrelationship between both residences and beautiful sceneries and a meander cut-off-area that reveals a special topographical characteristics, located at Samji village in Youngyang-eup, Youngyang-gun, Koungsangbuk-do. The meander cut-off area, developed at the middle or upper reaches of a river, often makes up specific landscapes such as precipitous cliffs, sheer cliffs and caves. And the area where is specially created by sudden change of flow due to erosion perceived by the cut surface to be the most beautiful scenic spot. These beautiful landscapes were used to be called as Dae, Dam or Gul and managed by Confucian scholars who enjoy refined taste and devote themselves to the study in nature. Moreover, the Ku-Hado-literary means the area of ex-flow-made the scholars' lving with a well prepared basis for agriculture where supplied a cornucopia of organic matters and water. The merit of agriculture made it possible that the scholars became economically independent, and the fact might be the essential point why the meander cut-off area took noticed. Actually, Cho-family has been in Smaji Village for generations, producing a large number of scholars and keeping the actual power of the region. The physical shape of the meander cut-off area, cozily surrounded by mountains, is considered as a good place for the dwelling due to the influence of traditional sight of view for location and P'ungsuchiri which is known as Feng Shui in China and geomancy in the western world. It is a fruit in it own way that we could find the ancestors' discernment and wisdom from this study, who have lived their lives adapting themselves to the given natural environment and also utilizing the nature wisely. But this is a current-argued study on the meander cut-off area. Follow-up studies have to be continued about the landscapes of the meander streams and the meander cut-off areas scattered all over the country except Samji Village and draw the characteristics from the comparative analysis.

• 전자공학회논문지S
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• 제34S권11호
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• pp.80-92
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• 1997

This research focuses onan efficient control method of temperature for multiple points using only one processor. For a yarn production system, the surface temperature control of heaters are very important for quality control. Therefore, we designed a temperature controller for a draw and twist machine and applied Fuzzy-PWM algorithm to the controller. If we use a processor for the temperature control of multiple points with the conventional ON/OFF control, the control performance of the system becomes poor. To overcome these problems, we developed a new Fuzzy-PWM algorithm for the adjustment of power rate to the heaters in the conventional ON/OFF control. It is shown that this algorithm has the same effects as the PID algorithm for the temperature control of each point. The proposed algorithm is robust against the production condition and environment such as the reference temperature and the thickness of yarn, since the power rate to the heater is adjusted by Fuzzy Rules derived from the values of the reference termperatureand the thickness of yarn. To obtain optimal Fuzzy rulees, the control simulations are perfodrmed through the modelling of the heater and simulation of Fuzzy rules. This algorithm is applied for the multiple pont temperature controller and showed satisfactory performance.

• 복식
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• 제67권1호
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• pp.40-55
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• 2017

The current new distribution environment provides the consumers to shop at anytime and any places by using mobile appliances. So, the companies which run the offline-store increase the contact point with the consumer by launching not only online-store but also the mobile application (app). Moreover, they are trying to operate the Omni-channel shopping environment. In order for this research to draw the direction of 'the Omni-Channel Strategy', which is about the changed distribution environment of the domestic fashion enterprise, the following steps were performed. First of all, the term related to 'Omni-Channel' is defined. And then, Example of the 'Omni-Channel' strategy and 'O2O' business in the domestic distributior were researched. Lastly, present condition of the 'Omni-Channel' strategy case of the domestic fashion industry was researched. At the result, the online-stores usually have several brands which can not represent their identities. It is suggested that each online-store according to each brand has their own characteristic identity. And The Omni-Channel strategy of the domestic fashion enterprise that is needed the connection point connecting the on-line and off-line. It is able to allure the customer to the off-line-store.

• 한국병원경영학회지
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• 제16권2호
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• pp.31-52
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• 2011

The cutthroat competition of the market for the medical services caused changes and developments of hospital management from the traditional provider-oriented management to a consumer-oriented management toward the customer. And the popularization of on-line community through the growth and spread of internet technology is developed into an important exploration activity to provide various medical information to patient(or customer) who wishes a high-quality medical services. This is an on-line Word-of-Mouth(WOM). It is a kind of information exploration that is performed by customers before choosing the hospital with off-line word-of-mouth. In this study, we develop our research model to verify the causal relationships among on/off-line WOM, key determinants of hospital choice and the customer's will to make use of the hospitals, and total effect of these variables. We adopt a component-based PSL method for an empirical analysis of the patients experienced dermatology or obstetrics gynecology. Finally, we understand the characteristics of the various medical services and draw new and significant strategic previews.

• 디지털콘텐츠학회 논문지
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• 제2권2호
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• pp.191-197
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• 2001

멀티미디어 기술을 활용한 컨텐츠 제작 시스템은 기존의 Off-Line 교육 시스템을 대체할 유력한 대안으로 각광을 받고 있는 실정이고, 따라서 그 수요는 급속하게 증가하고 있다. 수요의 급증에 따른 많은 컨텐츠 제작 시스템이 개발, 사용되고 있으나, 기존 시스템들은 컨텐츠 개발자의 편의성만 강조되어져 왔다. 이 시스템을 사용하여 제작된 가상 강좌들은 학습자들이 수동적으로 컨텐츠를 보도록 강요받아져, 자기의 의지를 전혀 반영할 수 있는 여지를 주지 못하는 방식으로, 컨텐츠의 효율적인 전달 및 평가 등에 많은 면에서 문제점들을 안고 있다. 본 논문은 가상대학교를 위한 컨텐츠 개발에 있어, Storyboard를 이용하여 이루어지는 컨텐츠 구성 방법과, Storyboard에 적시된 효과들을 극대화하여 구현할 컨텐츠 개발 방법을 제안하고, 이 제안에 따른 실제 개발 방법을 제시하고, 그 개발 방법에 따른 실제 개발 사례를 보여 주고자 한다. 본 논문이 제안, 구현 개발한 기법은 컨텐츠 강의자의 면대면 강의 효과를 최대한으로 프로그램하고, 학습자의 능동적인 참여를 유도하고. 또한 학습자의 지속적인 평가를 가능하게 하였다.

• 정보교육학회논문지
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• 제10권2호
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• pp.171-182
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• 2006

초등 과학과 학습은 관찰이나 실험 등의 탐구 활동을 소집단 중심으로 수행하는 경우가 많다. 학습자는 다양한 의견을 교류하면서 협력적 상호작용을 통하여 실험 및 관찰 결과로부터 결론을 도출할 수 있어야 한다. 오프라인과 온라인의 장점을 활용하는 새로운 교육방법인 블랜디드 러닝(Blended-Learning)을 활용하여 오프라인 상의 실험, 관찰 활동을 보완하고 온라인 커뮤니케이션 기능을 실험의 전 과정에 밀착 적용하여 학습자들의 다양한 상호작용을 강화함으로써 학습자들이 탐구학습에 보다 적극적으로 참여하도록 한다. 이러한 관점에서 제안된 웹 기반 탐구학습 시스템은 온라인 커뮤니케이션 기능을 사용하여 오프라인 탐구학습 과정에서 발생한 다양한 의견을 모으고 생각을 정리하여 아동들이 반성적 사고의 기회를 갖게 함으로써 탐구학습을 효율적으로 수행하도록 도와주는 것이다. 웹 기반 탐구학습 시스템을 초등학교에 실험한 결과 과학과 탐구학습에 대한 관심과 흥미도가 높아졌고, 학업 성취도가 향상되었으며 탐구학습 방법의 습득으로 탐구 능력이 향상되었다.

• 한국정밀공학회지
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• 제7권3호
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• pp.56-65
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• 1990

This paper describes a computer aided tool design system of deep drawing of cylindrical cups with or without flange by press. An approach to system is based on knowledge based system. The computer program has written in basic language with personal computer Knowledges for tool design are formulated from the plasticity theory, handbooks, experimental results and empirical knowhow of the field experts. The capabilities of developed system include 1) the selection of tool structure (with or without blank holder, single or double action, lift up or draw off type), 2) the design of tool elements(punch/holder, die/holder etc.) for the previous selected tool structure by the process planning output and the production quantity. The final output is generated in graphics form for design sheet.

• 한국정밀공학회지
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• 제7권3호
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• pp.94-102
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• 1990

A computer software which can draw and analyze pneumatic circuits was developed for the purpose of introducing and educating pneumatic circuits to beginners in this field. The program was developed using Turbo Pascal and Turbo Pascal Graphix Toolbox and could be run on IBM PC, XT, AT and other IBM compatible computers with a Hercules Graphics Board. The program was defeloped to show sequential control characteristics and to show two stages(on and off) of the pneumatic actuators. Users may save much time in drawing complex pneumatic circuits and can also use this software to check whether circuits are property designed before constucting real pneumatic circuits.

• 한국전산유체공학회:학술대회논문집
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• 한국전산유체공학회 2010년 춘계학술대회논문집
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• pp.86-92
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• 2010

A metal diaphragm compressor has been widely used for supplying a high pressures gas. This compressor mainly consists of gas oil space and metal diaphragm. Gas sucked in the gas space is compressed by an oscillating metal diaphragm existed between the gas and oil space. A non-return discharge and suction check-valve are components of the compressor that draw off the compressed oil and gas. Those components are self-actuated by differential pressures. Therefore, the rapid response and stable operating conditions are required. In the present study, to find out the dynamic behavior of the suction, discharge valve and diaphragm compressor, the unsteady flow field has been investigated numerically by using the unsteady two-way FSI (Fluid Structure Interaction) simulation method, $k-{\omega}$ turbulent model and mesh deformation.