• 전력전자학회:학술대회논문집
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• 전력전자학회 2018년도 전력전자학술대회
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• pp.322-323
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• 2018

차량용 LED 백라이트 구동회로는 시스템의 성능 향상을 위해 고밀도/고효율의 DC-DC컨버터가 요구되며 이를 위해 WBG(Wide Band Gap) 소자인 GaN HEMT가 기반의 동기 정류 부스트 컨버터의 설계 가이드를 제시하고 500kHz 스위칭 주파수의 30W급 동기 정류 부스트 컨버터를 구현한다.

• 한국정보처리학회:학술대회논문집
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• 한국정보처리학회 2023년도 추계학술발표대회
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• pp.811-812
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• 2023

드럼 연습 및 연주를 쉽게 배우고 즐기기 위한 시각적 가이드를 제공한다. CNN과 OpenCV를 활용하여 악보의 음표 이미지를 처리하고, 데이터 수집, 전처리, 모델 학습, 서버와 안드로이드 애플리케이션 연동 등 다양한 과정으로 구현된다. '드럼라이트'는 드럼 연주의 접근성을 높이고, 다른 악기와 음악 학습 분야에도 확장 가능한 가능성을 제시한다.

• KIEAE Journal
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• 제7권1호
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• pp.23-31
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• 2007

This study aims to evaluate the illuminance performance of sloped light guide with automated venetian blind systems. For the purpose, a mock-up model was constructed as a prototype of Korean office building with $12.0m{\times}7.3m{\times}3.7m$ ($w{\times}d{\times}h$) and south facing side-window mounted between the clerestory window($2.0m^2$) and the view window($5.6m^2$). The light guide of 1.28m deepth and $29^{\circ}$ tilted angle, is covered with 0.6mm galvanized steel sheet and 97% reflective film. To protect the room from low solar angle, a blind systems, 0.15m deepth and $30^{\circ}$ automated slat angle was installed. To assess illuminance performance, the totally 37 measuring points for illuminance were monitored. For the detailed analysis, photometric sensors were installed at work-plane (8 points), wall (7 points), ceiling (3points), and exterior horizontal illuminance (1 point) respectively. The performance was measured under clear sky and is monitored by Agilent data logger, photometric sensor Li-cor and the Radiant Imaging ProMetric 1400. Comparisons of light factor and uniformity are discussed.

• KIEAE Journal
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• 제13권3호
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• pp.97-104
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• 2013

This proposed simulation-based design study is based on the design of residential high-rise buildings in South-Korea. the purpose of this study is to evaluate the amount of daylighting performance passing through building glazing according to sky conditions, orientation of windows and each space of Apartment buildings. The clear sky includes sunshine and is intense and brighter at the horizon than at the zenith, except in the area around the sun. Daylight received within a building is directly dependent upon the sun's position and the atmospheric conditions. Orientation of the building generally used to refer to solar orientation which is the siting of building with respect to solar access. Although any building will have different orientations for its different sides, the orientation can refer to a particular room, or to the most important facade of the building. north-facing windows receive twice the winter sun than east and west facing windows, allowing light and warmth into the home. They can be easily shaded from the high summer sun to help keep the house cool. Ideally, the glazing area should be between 10-25% of the floor area of the room. This paper was calculated by a Desktop Radiance program. The space dimensions were based on a unit module of real constructed apartment having divided into five sections such as living room, room1, room2, room3 and kitchen.

• 디지털융복합연구
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• 제14권2호
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• pp.369-376
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• 2016

본 논문은 스프라이트 킷을 활용한 캐주얼 게임의 제작과정을 기술하고 있다. 최근 개인용 근접미디어 및 소셜 네트워크 사용의 보편화로 부상한 캐주얼 게임은 게임 산업의 질적 다변화와 게임의 대중화를 유도했다는 점에서 중요한 의미를 가진다. 이러한 배경에서 캐주얼 게임에 대한 이론적 고찰을 통해 캐주얼 게임 제작 프로세스를 3단계로 나누어 제시하고, 스프라이트 킷을 활용하여 게임 '라운드 앤 라운드'를 제작하였다. 또한 캐주얼 게임 프로덕션 과정을 구조 설계, 화면 구성 및 디자인, 전체프로그램 개발, 디버깅의 단계로 구분하여 정리하였다. 본 연구는 캐주얼 게임제작에 보다 쉽게 접근할 수 있도록 하나의 방법론을 제시함으로써 개인 혹은 소규모 인원들이 게임을 개발하는데 가이드라인이 되고자 하는 본질적인 목적에 부합했다고 판단된다.

• KIEAE Journal
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• 제7권1호
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• pp.65-72
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• 2007

As ecological design elements, daylighting can be applied to provide adequate illumination on visual tasks to create an attractive visual environment and to save electrical energy. Daylighting control systems reject direct sunlight and penetrate it onto the ceiling or to deep into the room. This study aims to evaluate the luminance environment of sloped light guide with automated venetian blind systems according to sun angle changes. For evaluation, a mock-up model was used and the south facing side-window mounted between the clerestory window and the view window. To assess luminance performance, 3 view points of luminance were monitored. As results, the conventional and lightshelves show ideal luminance ratio between workplane and surroundings(3:1) and workplane and darkness area(2:1) due to total ratio of surroundings and darkness area has lower ratio than workplane. Compared to the lightshelves window, conventional window shows unrelieved effect in between the workplane and brightness area(1:5). It means that there has low deviation according to the required standards. Also, compared to the ratio between the brightness area and darkness area(2~6:1) conventional window with high deviation(10~20:1) provide discomfort glare due to the excessively strong contrast, while lightshelves window shows a required luminance ratio that provide a three-dimensional effect to occupants. Therefore, luminance distribution indicate that application of a lightshelves and blinds not only has a significantly positive effect but also offers higher luminance quality in a daylit room

• 자동차안전학회지
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• 제11권4호
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• pp.16-21
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• 2019

In recent years, most automobile manufacturers have been using slim light source images to imprint their own brand image and identity. A light guide type lamp is widely used for making these kinds of a slim light source image. A light guide lamp means using a light emitting diode light source at one end of a long cylindrical pipe. The light from the light emitting diode source moves through the pipe by total reflection principle. Moving light is sent forward by various optic structures which is applied in the cylindrical pipe. However, the light guide lamp has a problem that the image of the light differs depending on the viewing direction, and in some cases there is dark section. It means light guide has low quality about lighting image. In this paper, trying to improve the fundamental problems of the light guide mentioned above by using various triz methods. Through functional modeling, estimating the factors affecting the light in the light guide lamp and make various ideas to improve the lighting image using the chain effect cause analysis, function oriented search scientific database techniques. Using these kinds of various TRIZ methods, finally find solutions that can improve the brightness and lighting uniformity of the light guide lamp. The ideas obtained in this paper were applied to actual vehicle development, and several patents achievements were obtained. In conclusion, it is proved that TRIZ method is useful for making ideas in actual automobile industrial field and is also a useful method for acquiring patent.

• 한국철도학회논문집
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• 제14권1호
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• pp.1-5
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• 2011

지하철 객실은 고농도의 이산화탄소로 오염되기 쉬운데, 이로 인하여 지하철 승객의 졸림, 두통, 무력감 등을 야기하기 쉽다. 이 때문에 환경부에서는 2007년에서는 열차와 지하철 객실의 이산화탄소 농도에 대한 가이드라인을 정한 바 있다. 본 연구에서는 지하철 객차용 이산화탄소 저감 시스템을 개발하고 실험용 객차를 이용하여 성능시험을 수행하였다. 다양한 종류의 개질 제올라이트를 이산화탄소 흡착제로 사용하여 지하철 객실 내부의 이산화탄소 농도를 저감할 수 있었다.

• 한국컴퓨터정보학회논문지
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• 제26권8호
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• pp.165-172
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• 2021

본 연구의 고유수용성신경근촉진법이 뇌졸중 환자의 균형에 미치는 효과를 알아보기 위한 메타분석 연구이다. 이 연구는 프리지마 가이드 라인에 의해 시행되었으며, 총 3개의 데이터베이스를 이용하여 2020년 12월까지 발행된 무작위 배정 연구로 한정하여 검색하였다. 데이터베이스에서 검색된 1475개의 연구 중 본 연구 선정기준에 부합된 12편의 연구를 선정하였다. 개별 연구들의 효과크기를 산출하기 위해 R 프로그램을 이용하였다. 고유수용성신경촉진법이 뇌졸중 환자의 보행 능력에 미치는 전체 효과크기는 0.67으로 중간 정도 효과로 나타났다. 보행에 대한 하위변수에 대한 효과크기는 게이트 라이트 0.69, 10 미터 걷기 검사 0.59로 중간 정도의 효과크기로 나타났다. 이처럼 고유수용성신경근촉진법이 뇌졸중 환자의 보행 능력에 긍정적인 영향을 주었다.

• Design & Manufacturing
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• 제17권4호
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• pp.42-51
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• 2023

In this study, we investigated the injection molding technology of thick-walled light guides, which are parts that control the light source of automotive lamps. Through injection molding analysis, the gate position that can minimize product shrinkage and deformation was selected, and a mold reflecting the analysis results was manufactured to evaluate the effect of injection speed and holding pressure on transferability during micro-pattern molding through experiments. When designing an injection mold for products with varying thicknesses, it was found that installing the gate on the side of the thicker part was advantageous for reducing volume shrinkage and deformation. It was found that the effect of shrinkage due to thickness may be greater than the position of the gate on pattern transferability. The pattern transfer error decreased as the injection speed and holding pressure increased, and it was found that increasing the injection speed was relatively effective.