• 한국조명전기설비학회:학술대회논문집
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• 한국조명전기설비학회 2002년도 학술대회논문집
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• pp.87-90
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• 2002

Daylight responsive dimming system, which is always able to automatically maintain the target illuminance, is a energy strategic system. It is importance note that the photosensor depends how to be precisely indicated workplane illuminance at any location of indoor. Therefore, the purpose of this paper is to find out the optimum location and spatial characteristics of photosensor by considering the correlation for the correct calibration of workplane illuminance and photosensor signal.

• 한국조명전기설비학회:학술대회논문집
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• 한국조명전기설비학회 2005년도 춘계학술대회논문집
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• pp.123-128
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• 2005

This study purposes to increase the energy-saving effects by reducing excessive intensity of radiation of artificial lighting through analyzing daylight incident A photosensor sends amounts of detected luminous flux to digital control unit(DCU) as a signal and then, it can decide dimming ratios, received a proper dimming signal from DCU. Generally it Is effective to control artificial lighting with the different control ratio of each row by setting a photosensor as same numbers and rows as artificial lighting. However, it is ineffective to do in initial costs of systems aspect in offices. As a result of grasping the distribution of daylight previously, we can dim different dimming ratios to each row of artificial lighting by a single photosensor.

• 한국조명전기설비학회:학술대회논문집
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• 한국조명전기설비학회 2005년도 학술대회 논문집
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• pp.167-172
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• 2005

This study based on the experimental data on the daylight responsive dimming systems performance. The purpose of this study increases the energy-saving effects by reducing excessive intensity of radiation of artificial lighting through analyzing incident daylight. The photosensor sends amounts of detected luminous flux to digital control unit(DCU) as a signal and then, it can decide dimming ratios, by received a proper dimming signal from DCU. Generally it is effective to control artificial lighting with the different control ratio of each row by setting a photosensor as same numbers and rows as artificial lighting. However, it is ineffective to do in initial costs of systems aspect in offices. By analyzing the data of this performance and finding regular ration between photosensors. we will execute different dimming ratios to each row of artificial lighting by a single photosensor.

• 설비공학논문집
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• 제24권5호
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• pp.433-442
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• 2012

The influence of outdoor sky conditions on photosensor signals were examined to determine an appropriate index that is effectively used for optimum illuminance fluctuation when a daylight dimming system is used for a small office. Field measurements were conducted under various sky conditions. Results indicate that the outdoor global and vertical illuminance fluctuated within narrow ranges under clear and overcast sky conditions. The fluctuation of sky ratio under partly-cloudy sky caused wide ranges of illumnance fluctuation. A partially-shielded photosensor at backwall produced 56% of light output from fixtures controlled by a photosensor at ceiling. This implies that the photosensor at backwall does not always guarantee target illuminance due to the less output. The fluctuation of light output from fixtures were insignificant under clear and overcast sky. The fluctuation range of photosensor illuminance under partly-cloudy sky caused wide fluctuation ranges of light output. Regression result implies that the outdoor vertical illuminance was recommended for an effective index that is used for control of light output.

• 조명전기설비학회논문지
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• 제17권5호
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• pp.8-14
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• 2003

광센서 조광제어시스템은 실내로 유입되는 주광량에 따라 자동으로 광속량을 조절하여 설정조도를 유지시켜주는 에너지절약 시스템이다. 이 시스템의 성공여부를 결정하는 여러 요인들 중, 광센서의 측광값이 작업면 조도를 얼마나 정확히 나타내는가가 중요한 포인트가 된다. 그래서 본 연구에서는 실험을 통해 광센서의 여러 측광방향 형태를 결정하고, 각 측광방향별 광센서의 반응신호를 측정하였다. 그리고 광센서의 적절한 위치를 찾기 위해 실제공간에서 서로 다른 위치에 광센서를 설치하여, 작업면 조도와 광센서 반응신호의 관계를 측정하고 분석하였다. 분석된 결과를 토대로 광센서의 적절한 위치와 측광방향성을 제시하였다.

• 조명전기설비학회논문지
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• 제21권1호
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• pp.1-9
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• 2007

본 연구는 실내로 유입되는 주광을 조광제어시스템의 적용에 효율적으로 활용하여 초과한 인공조명의 광량을 줄임으로써 에너지 절약의 효과를 높이고자 함이다. 광센서는 탐지된 광속량을 신호로 보내고 그에 알맞은 제어신호를 받아 조광율을 결정하는데, 일반적으로 사무공간에서 인공조명의 개수나 행수만큼 광센서가 설치가 되어 조명기구의 각 구역마다 다른 조광율로 조광제어를 하는 것이 인공조명 제어측면에서는 효율적이나, 시스템 설치비용측면에서는 비효율적이다. 그러므로 실험과 시뮬레이션을 통하여 미리 유입되는 주광 분포를 파악하고 조광율을 분석한다면, 하나의 광센서 설치로써 인공조명 구역간의 각기 다른 조광율로 제어가능하다.

• 한국컴퓨터정보학회논문지
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• 제13권1호
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• pp.219-226
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• 2008

사람으로부터 나오는 신호는 다양하고 그 데이터의 양도 매우 많다. 이러한 신호는 누구에게나 똑같이 발생하는 것이 아니기 때문에 각각의 사람마다 발생하는 신호를 분석하면 그 사람의 건강을 분석할 수 있는 중요한 자료로서 사용되어질 수 있다. 본 시스템은 인체의 손끝은 장부와 연결되어 손끝의 정보를 활용하면 건강을 진단할 수 있다는 한의학적 진단방법을 활용하여 인체 손끝에서 나오는 맥, 온도, 저항을 반사형 포토센서로 측정하여 이를 분석하고 장부의 허실을 판단하여 건강을 진단하는 시스템이다.

• 한국광학회:학술대회논문집
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• 한국광학회 2003년도 하계학술발표회
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• pp.98-99
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• 2003

PIN photodiode has been used in solid-state detector for x-ray detection as a photosensor of visible light from scintillator. Since the light from CWO is short wavelength having peak at 490nm, the light is absorbed within a very shallow layer near the surface of the photodiode before arriving at the depletion layer and does not contribute to the signal. In designing the PIN photodiode, it is important to make the p-layer as shallow as possible. (omitted)

• 대한전자공학회:학술대회논문집
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• 대한전자공학회 2006년도 하계종합학술대회
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• pp.1015-1016
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• 2006

The important parameters deciding the fluctuation of Accumulation style surgical operation of ventriculus laser beam are smoothing capacitor, frequency and he characteristics of laser resonator. In this thesis, we control the fluctuation of medical $CO_2C$ laser in realtime by changing Duty-Ratio of IGBT and switching frequency with fixed the smoothing capacitor to improve the fluctuation of laser beam. We detect the light on laser resonator using a CdS photo sensor to improve ripple factor of laser beam and feedback fluctuated signals refined by a band pass filter into the control circuit to stabilize fluctuation actively. There is much to be desired in the realtime controlling technique of the light on Accumulation style surgical operation of ventriculus laser discharge tube in electrical signal. We propose switching control technique with microprocessor and photo sensing technique by controlling switch devices optimum operation and feedback signals detected by a photo sensor into the laser power supply in order to improve ripple factor of the $CO_2$ laser beam.

• Journal of information and communication convergence engineering
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• 제10권1호
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• pp.91-95
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• 2012

The photoplethysmography (PPG) signal measured from a mobile healthcare device contains various motion artifacts occurring from a patient’s movements. Recently, to reject the motion artifacts, the method of using an acceleration sensor was suggested, but such sensors are very expensive. Therefore, this study deals with a novel sensor device to replace the acceleration sensor, and evaluated the performance of the proposed sensor experimentally. In the results of the experiments, it is shown that the proposed sensor device can reconstruct the PPG signal despite the occurrence of motion artifacts, and also that the variation rate in heart rate analysis was 1.22%. According to the experimental results, the proposed method can be applied to design a low-cost device.