• Proceedings of the Korean Institute of IIIuminating and Electrical Installation Engineers Conference
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• 2005.11a
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• pp.29-34
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• 2005

본 연구는 청계천의 구성요소에 대해 경관연출효과를 분석하기 위해 주요구성요소 4곳을 상대로 경관현황을 조사하였다. 도시에서의 빛연출은 도시의 아이덴티티를 형성하고 또한 청계천 같이 6km에 다다른 하천은 관광자원으로써도 활용된다. 따라서 청계천 빛환경을 분석하기 위해 경관에 있어서 조명학적으로 중요한 물리량 평가요소로 휘도, 색도, 색온도를 선정하였다. 디지털 광학 계측기인 Radiant Imaging Prometric 1400에 의해 측정된 휘도, 색도, 색온도 등의 물리량 측정결과 주야간 모두 주변과 조화를 이루고 있는 것으로 나타났으며, 휘도대비가 16:1을 넘지 않아 시각적으로도 적절한 것으로 판단됐다. 따라서 청계천 주요수성요소의 경관연출은 주 야간 모두 이용자들에게 안락한 경관을 제공할 것으로 사려된다.

• Proceedings of the Korea Information Processing Society Conference
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• 2014.04a
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• pp.24-27
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• 2014

본 연구에서는 공원이나 학교 등의 안전한 생활을 위한 LED 제어 플랫폼 개발을 제안한다. 우리는 공원이나 학교에서 주변 환경에서 사람이 근접하면 밝기를 조절하여 불안 요소를 제거하고, CCTV 카메라와 연계된 보안제어 장치 개발을 통해 안전한 생활 서비스를 제공한다. 또한 상황에 따른 감성조명 제어 서비스를 제공한다. 통합 관제 플랫폼 개발은 공원이나 학교 등의 조명시설을 중심으로 서비스를 제공하고 향후 방범, 교통, 환경, 방재, 시설물관리 시스템들을 경제적으로 구축하고 효율적으로 관리하기 위한 확장 가능한 서비스 기술을 제공할 수 있도록 한다. 제안 시스템은 동일 장치에서 사계절마다, 테마별 감성을 표출하도록 프레임 그룹을 수행시킴으로써 원하는 감성을 표출할 수 있음을 보여주고 있다.

• Proceedings of the Korean Institute of Industrial Safety Conference
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• 2003.10a
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• pp.361-369
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• 2003

야간작업은 가능하면 피해야 하지만 공사기간의 제한이나 공정상의 이유로 인하여 불가피하게 진행되는 경우가 있다. 또한, 주간에서와 같이 눈으로 보면서 식별하고 위험을 인지할 수 있는 신체적 능력이 저하될 뿐만 아니라 조명등의 주변여건이 식별을 불가능하게 하거나 불확실한 시각으로 부정확한 식별이 이어지는 잠재위험이 상존해 있다고 볼 수 있다.(중략)

• JOURNAL OF ELECTRICAL WORLD
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• no.7 s.127
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• pp.84-88
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• 1987

인버터는 가정용 에어콘이나 형광등 조명기구의 전자전등회로 등 최근에는 우리들 생활주변에까지 응용이 확대되고 있으며 매우 중요한 제어장치이다. 산업분야에서는 전동기 및 전동기 이용장치의 가변속제어 등에 널리 이용되고 있다. 여기서는 단지 직류에서 교류에의 변환장치가 인버터라는 이해에서 그 제어가 어떻게 이용되고 있는지에 대하여 해설한다.

• Journal of the Korean Institute of Illuminating and Electrical Installation Engineers
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• v.22 no.10
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• pp.104-110
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• 2008

Desire about agreeable habitat by enhancement of standard of living has been increased, and common complaints by transformer noise have been happening constantly. It has been installed resonator and sound-proof shutter in order to solve substation's noise problems. But those methods are not effective. Therefore, It is necessary to study transformer noise level that can satisfy noise regulation standard. In this paper described that predicted transformer noise level of substation boundary by operating situation at the indoor substation. Also, Presented most suitable noise level of transformer that satisfy noise regulation standard at the indoor substations through predicted results.

• Journal of KIISE:Computing Practices and Letters
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• v.16 no.2
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• pp.186-200
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• 2010

In order to render global illumination realistically, we need to accurately compute the direct and indirect illumination that represents the light information incoming through complex light paths. In this process, the indirect illumination at given point is greatly affected by surrounding geometries. Harmonic mean distance is a mathematical tool which is often used as a metric indicating the distance from a surface point to its visible objects in 3D space, and plays a key role in such advanced global illumination algorithms as irradiance/radiance caching and ambient occlusion. In this paper, we analyze the accuracy of harmonic mean distance estimated against various environments in the final gathering and photon mapping methods. Based on the experimental results, we discuss our experiences and future directions that may help develop an effective harmonic mean distance computation method in the future.

• The Proceedings of the Korean Institute of Illuminating and Electrical Installation Engineers
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• v.11 no.1
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• pp.92-98
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• 1997

In this paper, the results of the measurement and analysis of extremely low freqency(ELF) eletric field in the vicinity of 154[kV] overhad transmission lines have been described. The planar-type electric field sensor has been fabricated by three dimensional structure with special consideration of taking the power frequency and lower components. The calibration experiments have been carried out according to the procedures of IEEE recommendation. The electric field measuring system has the frequency bandwidth of 7[Hz] to 2.7[MHz] and the response sensitivity of 0.094[mV/V/m]. Also the practical measurements of electric field under an 154[kV] double corcuit overhead transmission lines have been made abd abalyzed. It was known that the lateral electric field profiles under an 154[kV] double circuit overhead transmission lines show the asymmetrical distributions owing to the environmental metal frame structures and their maximum electric field magnitude is less than 3[kV/m]. It can be concluded that the measured results of the electric fields satisfy with all limits or guide -lines of the various authorized international institutes' recommendations.

• The Journal of the Institute of Internet, Broadcasting and Communication
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• v.16 no.1
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• pp.199-207
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• 2016

In this paper, we propose efficient smart indoor emotional lighting control system based on android platform using the biological signal. The proposed smart indoor smart emotional lighting control system were configured as the biological signal measurement device and removable smart wall pad, lighting driver, luminaire. The control system was extracts the emotional language by measured the biological signal, and it was transmitted a control signal to each lighting driver using a bluetooth in the wall pad. The lighting driver were designed to control the lighting device through an expansion board by collected control signal and the illuminance information the surrounding. In this case, the wall pad can be selecting of manual control and the bio signal mode by that indoor emotional lighting control algorithms, and it was implemented the control program that possible to partial control by selecting the wanted light. Experiment results of the proposed smart indoor emotional lighting control system, it were possible to the optional control about the luminaire of required area, and the manual control by to adjustable of color temperature with that the efficiently adjustable of lighting by to biological signal and emotional language. Therefore, were possible to effective control for improvement of concentration and business capability of indoor space business conduct by controlling the color and brightness that is appropriate for your situation. And, was reduced power consumption and dimmer voltage, lighting-current than the existing-emotional lighting control system.

• Journal of the Korea Computer Graphics Society
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• v.22 no.3
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• pp.89-99
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• 2016

One of the fundamental elements in developing mixed reality applications is to effectively analyze and apply the environmental lighting information to image synthesis. In particular, interactive applications require to process dynamically varying lighting sources in real-time, reflecting them properly in rendering results. Previous related works are not often appropriate for this because they are usually designed to synthesize photorealistic images, generating too many, often exponentially increasing, light sources or having too heavy a computational complexity. In this paper, we present a fast light source estimation technique that aims to search for primary light sources on the fly from a sequence of video images taken by a camera equipped with a fisheye lens. In contrast to previous methods, our technique can adust the number of found light sources approximately to the size that a user specifies. Thus, it can be effectively used in Phong-illumination-model-based direct illumination or soft shadow generation through light sampling over area lights.

• Journal of the Korean Institute of Illuminating and Electrical Installation Engineers
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• v.23 no.4
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• pp.56-61
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• 2009

This paper presents the ground surface potential profiles and hazard voltages around the metallic structure connected to a small-sized model ground electrode. Because it is very difficult to draw valid conclusions concerning a general grounding problem from actual field data, scale model tests can be used to determine the touch and stop voltages and surface potential profiles around ground electrode. In this work, a hemispherical vessel with a diameter of 1,100[mm] was employed to simulate uniform soil. As a result, the ground surface potential around the ground electrode was significantly raised In particular the ground surface potential at the just upper point of ground rod was higher than other points. When the buried depth of ground rod is increased, the ground surface potential and step voltage were lowered but the touch voltage was elevated.