• 한국컴퓨터그래픽스학회논문지
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• 제8권2호
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• pp.23-29
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• 2002

컴퓨터 그래픽스 분야에 있어서 하드웨어의 활용은 렌더링 속도를 높이고 높은 수준의 결과를 얻기 위한 중요한 요소이다. 최근의 급속한 하드웨어의 발달은 기존에 불가능했던 다양한 여러 가지 효과들을 가능하게 해 주었으며, 쉐이더 기능을 이용하여 고급의 렌더링 기법들을 실시간에 구현할 수 있게 되었다. 본 논문에서는 이러한 하드웨어를 이용하여 최대 4가지의 물질에 대한 직접 볼륨 렌더링(direct volume rendering)을 수행할 수 있는 기법을 제안한다. 이 기법에서는 다양한 물질에 대한 렌더링 기능 이외에 그라디언트 값에 의한 물질 표면의 강조 효과, 광원의 거리에 의한 빛의 감소효과(Light Attenuation)와 Depth cueing, 복수의 광원에 의한 조명 효과 등의 다양한 고급 렌더링 기법들을 볼륨 렌더링에 적용할 수 있다.

• KIEAE Journal
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• 제16권3호
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• pp.35-46
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• 2016

Purpose: This paper aims to analyse the composition system of architectural elements including shape, kinetic and material elements of kinetic facades and establish the design parameter system as a common conceptual and practical knowledge sharing platform with mechanical and electrical experts. Method: This research has been conducted in a three steps. At first, 120 cases of external shading devices are analyzed and their classification criteria have been established. Secondly geometric, kinetic and material elements are categorized in a common kinetic facade coordinates system considering environmental effects and operation method, and the applicability of combination of each element are tested. Lastly core design parameters for each element have been established in a common office building installation coordinate. Result: Geometry elements are categorized into seven geometric shapes and kinetic elements is categorized into basic linear and rotational motion and combinational folding and rolling motion. The combined set of parameters for three elements composes the whole design parameters for architectural elements of kinetic façade. Design parameters of shape elements are composed of shape, installation and arrangement parameters; design parameters for kinetic elements are composed of axis and range parameters; and design parameters of material elements are composed of thermal, lighting and color parameters.

• 대한전기학회논문지:전력기술부문A
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• 제51권12호
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• pp.630-637
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• 2002

This paper proposed a new diffusion model considering DSM rebate program's support conditions. The proposed method used some aspects of the rebate program such as support qualifications, annual support volume, and support level per appliance as following : The support qualifications were limited as the consumer which can get the rebate program's benefit, the annual support volume was constrained as the fixing budget and the support level per appliance was considered by high-efficient appliance actuality price. This paper also proposed a new method that used neural network as its parameter estimation moth[,4 for the diffusion model. The diffusion model and its parameter estimation method are expected to be able to analyze the diffusion characteristics of high-efficient appliance through the rebate program and the effects of rebate program's support conditions. Also, these will be able to evaluate the impacts and to analyze the cost-effectiveness of Energy Efficiency Demand-Side Management(EEDSM) resources. The case study is performed on the high-efficient lighting appliance rebate program of Korea by using the suggested diffusion model and estimation method and thus verified its validity.

• 대한전기학회:학술대회논문집
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• 대한전기학회 2001년도 춘계학술대회 논문집 전력기술부문
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• pp.194-196
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• 2001

Light dimming is based on adjusting the voltage which gets to the lamp. Light dimming has been possible for many decades by using adjustable power resistors and adjustable transformers. The power electronics have proceeded quietly since 1960. Between 1960-1970 thyristors and triacs came to market. Using those components it was quite easy to make small and inexpensive light dimmers which have goof efficiency. This type of electronic light dimmers became available after 1970 and are nowadays used in very many locations like homes, restaurants, conference rooms and in stage lighting. But the problem of thyristor dimmer have been that it has poor efficiency and voltage drop. Recently IGBT(Insulated Gate Bipolar Transistor) control is a new way to do light dimming for improving this problems. IGBT dimmer has many other advantages over traditional thyristor dimmer there are no huge current spikes and EMI caused by turn on Using IGBT it is possible to make the turn-off rate relatively slot to achieve quite operations in terms of EMI and acoustical or incandescent lamp filament noise. For the development of IGBT dimmer. This paper shows the effects of IGBT dimmer compared with thyristor dimmer through a simulation using EMTDC.

• 전기전자학회논문지
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• 제23권4호
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• pp.1448-1456
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• 2019

본 연구에서는 작물재배용 단동식 유리온실 내에 LED 광원을 적용할 때, LED의 전원 공급을 위한 태양전지를 에너지 저감과 광투과율을 고려하여 Si 계열의 태양전지와 염료감응형 태양전지(DSSC)를 유리온실에 선별적 배치하고, 작물 재배에 유효한 태양전지의 광투과율을 결정하기 위해 유리온실의 천정과 측면에 대해 광투과율 변화에 따른 조도 시뮬레이션을 수행하였다. 또한, 유리온실에서 주광과 인공광인 LED 광원을 모두 고려하는 경우 최적 조명제어에 따른 유리온실의 에너지 절감 효과를 분석하였다.

• 대한전기학회:학술대회논문집
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• 대한전기학회 2008년도 제39회 하계학술대회
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• pp.337-338
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• 2008

KEPCO has built, for the first time in the world, 765㎸ double circuit transmission lines which use vertically arranged phase conductor, while 765㎸ transmission lines in other countries are single circuit lines and use horizontally arranged phase conductor. System operating voltage, switching overvoltage, and lightning overvoltage were considered in determining the air gap. Recently, however, lightning outage rate of some 765㎸ transmission lines in KOREA shows that it is more than what is expected. Lightning fault of 765㎸ transmission lines is mostly single phase grounding fault which can be reclosed. But it still needs to be carefully managed, for the bulk system like 765㎸ transmission lines have huge effects on whole power system. This paper introduces analysis and countermeasure of KEPCO's 765㎸ transmission line lightning outage.

• 한국실내디자인학회논문집
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• 제13권5호
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• pp.215-222
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• 2004

Buildings' outward appearances, sidewalks, and street lights have long been regarded as important factors identifying the street landscape of a city. On the other hand, the interior spaces of a building have been known to have less correlation with street landscape. This paper, which did not use standardized urban street landscape application methods, attempts, based on an experiment involving Pimatgol, to prove that small changes in interior design influence the street landscapes of cities and even provide new vigorousness. Pimatgol is a type of village that still possesses a traditional Korean lyrical atmosphere. This paper also attempts to, with the use of a physical model and a digital simulation of small changes interior design, such as changes in materials, size of the opening, location of furniture, or a change of lights, uncover positive changes in street landscape. Computer simulation is one of the extraordinarily useful techniques to predict lighting performance, changing interior space and present visual image. As a result, this study can be a valuable guideline for the future streetscape reform project to lead the demanding effects of the interior space.

• 조명전기설비학회논문지
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• 제18권3호
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• pp.40-47
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• 2004

최근 다양한 용도로 활용되고 있는 지하철 역사는 새로운 거주공간으로 주목되고 있다. 그러나 지하철 역사는 지하공간으로 인한 폐쇄성 및 사용자의 심리적 거부감을 완화시키기 위해 자연광의 유입이 필요하다. 본 연구는 자연광이 도입된 지하철 역사와 인공조명으로 계획된 역사를 대상으로 조명환경 실태 및 실내 시환경을 평가하였다. 이를 위해, 먼저 선정된 지하철 durg사의 현장측정을 자연광의 영향이 적은 담천공에서 실시하였다. 또한, 사용자를 대상으로 주간에 설문조사를 실시하여 실내 시환경에 대한 조명인식을 평가하였다. 연구결과, 지하철 역사의 시환경에 대한 자연광의 영향 및 출입구 부분에 완화조명이 필요한 것으로 분석되었다. 본 연구결과는 앞으로 보다 효과적인 지하철 역사 조명계획을 위한 기초 활용될 수 있으리라 기대된다.

• 한국방송∙미디어공학회:학술대회논문집
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• 한국방송공학회 2009년도 IWAIT
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• pp.664-667
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• 2009

There is strong demand to create wearable PC systems that can support the user outdoors. When we are outdoors, our movement makes it impossible to use traditional input devices such as keyboards and mice. We propose a hand gesture interface based on image processing to operate wearable PCs. The semi-transparent PC screen is displayed on the head mount display (HMD), and the user makes hand gestures to select icons on the screen. The user's hand is extracted from the images captured by a color camera mounted above the HMD. Since skin color can vary widely due to outdoor lighting effects, a key problem is accurately discrimination the hand from the background. The proposed method does not assume any fixed skin color space. First, the image is divided into blocks and blocks with similar average color are linked. Contiguous regions are then subjected to hand recognition. Blocks on the edges of the hand region are subdivided for more accurate finger discrimination. A change in hand shape is recognized as hand movement. Our current input interface associates a hand grasp with a mouse click. Tests on a prototype system confirm that the proposed method recognizes hand gestures accurately at high speed. We intend to develop a wider range of recognizable gestures.

• 한국전기전자재료학회논문지
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• 제17권5호
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• pp.541-544
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• 2004

Multi- wall carbon nanotubes(MWNTs) were synthesized by thermal chemical vapor deposition. The paste for screen printing was composed of MWNTs, organic vehicle and glass frit. Carton nanotube paste was screen-printed on ITO(indium tin oxide) deposited soda lim을 glass, and then heat treatment was performed. Before the surface treatment, turn on field of derive was 2.6 V/$\mu\textrm{m}$. After the surface treatment, the value was changed into 1.8 V/$\mu\textrm{m}$. The anode current of the derive with 2.83 V/$\mu\textrm{m}$(turn on field) was changed 4 $\mu\textrm{A}$ into 390 $\mu\textrm{A}$ at 1,700 V. Adsorption effect of MWNTs onto phosphor of anode plate was observed by the field emission measurement and resulted in bad effects on properties of devices lifetime and emission lighting.