• Journal of the Korea Society of Computer and Information
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• v.12 no.6
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• pp.243-249
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• 2007

I propose the excess noise suppressed optical sensor network using optical CDMA with gain saturated optical amplifier in order to increase number of sensors simultaneously connected to network. Simulation analyses confirm that the maximum number of sensors simultaneously connected to the optical sensor network can be largely increased by increasing the gain of gain saturated optical amplifier owing to the pression of access noises with the assignment of sweeping frequency of optical sensors within 10MHz. In the case of the requested SNR of 20dB and the sweeping frequency of 10MHz, the maximum number of sensors simultaneously connected to the optical sensor network can be increased four times as many as the conventional system.

• Journal of the Korea Institute of Information and Communication Engineering
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• v.12 no.5
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• pp.956-962
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• 2008

We propose the optical CDMA based audio acoustic sensor using optical fiber sensors which can be used in the bottom of the sea. In the proposed network, we analyzed the performance of noise power. Numerical simulations confirm that the performance can be improved by increasing the measuring time of optical sensors compared with using conventional WDMA method.

• Journal of the Korean Institute of Illuminating and Electrical Installation Engineers
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• v.17 no.5
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• pp.8-14
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• 2003

The daylight responsive dimming system, which uses daylight and automatically controls the light output of electric lighting according to the amount of 3.vailable daylight, is an energy saving system Successful performance relies on how photosensor signal can precisely represent workplace illuminance. However, it is not accurately identified due to the dynamic nature of the sun and the sky changed with respect to different seasons or time. The purpose of this research is to identify the correlation between workplace illuminance and photosensor signals, and propose an optimal location and spatial characteristics of the photosensor through experiments, which minimizes the above impacts and improve system performance.

• The KIPS Transactions:PartC
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• v.13C no.3 s.106
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• pp.311-316
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• 2006

We propose the optical sensor network using optical CDMA with bipolar receiver and modified Pseudorandom Noise codes which are widely used in the wireless communication network. We numerically analyze the performances in the optical sensor network. In the proposed network, multiple access interferences between two sensors are suppressed by performing synchronization between the optical encoder and the optical decoder and adjusting the delay times of optical delay lines. Numerical simulations confirm that the performance can be acquired by suppressing the beat noise among optical signals as the number of sensors increases.

• 전기의세계
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• v.42 no.10
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• pp.14-24
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• 1993

본고에서는 광센서 기술의 특징과 가시광 센서를 이용하여 응용될 수 있는 분야중 산업용과 의료용으로서의 사용 예를 살펴보고, 현재 외국과 국내의 광 센서 기술수준과 수용 및 시장 등에 관하여 알아보고자 한다.

• Journal of Korea Society of Industrial Information Systems
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• v.15 no.5
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• pp.29-35
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• 2010

In this paper, We implemented discriminating system for various surround illuminants using photo sensor. To discriminate surround illuminants of display device we implemented discriminating system using photo sensor which has output of Ye and Cy. Experimental results shows that we could discriminate surround illuminants by output voltage ratio (Ye/Cy) of photo sensor in the variable luminous intensity of surround illuminants.

• Proceedings of the Korean Vacuum Society Conference
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• 2012.02a
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• pp.106-106
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• 2012

인체 내 소량의 생체성분을 감지하는 바이오센서 기술은 질병 진단뿐만 아니라 예방 및 관리로 의료서비스 확대 및 의료비 감소 효과를 가져올 수 있는 기술이다. 광 바이오센서는 광학적인 측정방법을 이용하여 다양한 생화학물질들의 상호 반응을 검출해 낼 수 있는 바이오센서로 현재 활발하게 연구가 진행되고 있다. 일반적으로 형광물질, 발색물질 등의 발광물질을 인식물질에 표지하여 인식물질과 분석물질과의 반응 유무를 표지된 발광물질의 광 신호를 감지하여 분석물질을 검출해내는 표지식 광 바이오센서 기술이 상용화되고 있다. 그러나 이러한 분석 방법은 민감도는 우수하지만 분석 시간이 매우 느리고, 고가의 분석 장비를 필요로 하는 단점들을 가지고 있다. 이러한 단점들을 극복하기 위하여 생화학 반응 유무를 표지물질 없이 광학적 방식으로 직접 측정해내는 비 표지식 광 바이오센서 기술이 최근 들어 많이 연구되고 있다. 본 논문에서는 비표지식이면서 분광기 없이 분석 가능한 공진 반사광 바이오센서 기술에 관한 내용을 소개하고자 한다. 공진 반사광 바이오센서는 광파장 이하의 주기를 가진 주기적 공진 격자 표면에서 일어나는 항원-항체 반응에 대한 공진 반사 파장을 측정하여 원하는 바이오물질을 고감도로 검출할 수 있는 바이오센서이다. 또한, 인체 내장을 위하여 플렉시블 기판 상에 GaN LED를 집적하여 전립선암 바이오 마커 검출에 대한 결과를 소개하고자 한다.

• Journal of Digital Convergence
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• v.12 no.11
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• pp.387-393
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• 2014

In this research, we aimed to investigate the most optimum pulse wave sensor to ear label of live stocks among pulse wave piezo film sensor, conductive textile sensor, photo sensor. As a result of this research with application to 10 cattle, 10 pigs objects with pulse wave piezo film sensor, conductive textile sensor, photo sensor, photo sensor shows less standard deviation to average value than piezo film sensor or conductive textile sensor which means it is the most stable for the cattle. With pigs, piezo film sensor, conductive textile sensor and photo sensor all show stable pulse rate. Thus, to take pulse rate of livestock with curved body and long and dense coat such as cow, photo sensor will be considered as the most efficient mean.

• Journal of the Korean Society of Radiology
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• v.15 no.4
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• pp.525-531
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• 2021

The detector of the positron emission tomography (PET) is composed using a plurality of scintillation pixels and photo sensors. The use of multiple photo sensors increases cost and complicates signal processing. In this study, a detector with reduced cost and simple signal processing was designed using a small number of photo sensors. A scintillation pixel and a small number of photo sensors were used, and a optical guide was used to deliver light to all the photo sensors. A reflector is applied to the scintillation pixel and the optical guide to transmit the maximum amount of light to the photo sensor. A diffuse reflector and a specular reflector were used for the reflector, and a flood image was obtained by applying different thicknesses of the optical guide. An optimal combination was selected through comparative analysis of the acquired flood images. As a result, when specular reflectors were used for both the scintillation pixel and the optical guide, excellent flood images were obtained from optical guides of all thicknesses. For the optical guide, the optimal image was obtained when using a 3 mm thickness in consideration of the size of the image and the analysis of the point where the image of the scintillation pixel was formed.

• Electrical & Electronic Materials
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• v.9 no.5
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• pp.518-525
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• 1996

본 고에서는 유리 집적광센서의 제작에 적합한 유리재료들의 종류와 특성을 설명하였으며, 이들 유리의 종류에 맞도록 개발되어진 제작기술 중에서 이온교환(Ion exchange)방법과 silica-on-silicon(SOS)방법을 소개하였다. 그리고 이러한 공정기술을 이용하여 제작되어진 유리 집적광센서 중에서 물체의 거리를 측정하기 위한 마이클슨 간섭계(michelson interferometer)와 물질의 농도를 측정하기 위한 화학센서(chemical sensor)들을 소개하였다.