• 한국지능시스템학회논문지
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• 제17권6호
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• pp.744-748
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• 2007

이 논문에서는 다수의 IR 거리센서를 이용한 실내용 이동로봇의 자기위치 추정에 관한 새로운 방법을 제안한다. 각각의 IR 거리센서로부터 획득한 거리데이터를 이용하여 장애물과 벽면의 모서리를 검출한다. 각 센서에서 측정된 데이터를 병합하여 환경지도를 작성한다. 실험을 통하여 얻어진 환경지도와 실제 환경을 비교하고 그 성능을 평가하였다.

• 센서학회지
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• 제21권6호
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• pp.402-407
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• 2012

We report a Fabry-Perot interferometer (FPI)-based multi-channel micro-spectrometer used for multi-gas measurement in the spectral range of $3-5{\mu}m$ and its gas sensing performance. The fabricated infrared (IR) spectrometer consists of two parts: an FPI on the top side for selective IR filtering and a $V_2O_5$-based IR detector array on the bottom side for the detection of the filtered IR. Experimental results show that the FPI-based multi-channel gas sensor has reliability and selectivity for simultaneously detecting environmentally harmful gases such as $CH_4$, $CO_2$, $N_2O$ and CO in the spectral range of $3-5{\mu}m$. The fabricated FPI-based multi-channel gas sensor also demonstrated that a reliable and selective detection of gas concentrations ranging from 0 to 500 ppm is feasible. In addition, the electrical characteristics demonstrate a superior response performance in regards to the selectivity in the multi-target gases.

• 한국전자통신학회논문지
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• 제18권4호
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• pp.669-676
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• 2023

본 논문에서는 IR 레이저 센서 및 관성 센서를 이용한 골프 퍼팅 거리 측정을 위한 다목적 골프 퍼팅 거리 측정기를 설계, 제작하였다. 거리 측정기는 골프 퍼팅 거리 측정을 위해 실외 50m 측정 범위 내에서 거리 측정과 경사도 측정, 그리고 퍼팅에 영향을 미치는 온도 측정이 가능하도록 설계하였다. 또한, 실내 30m 측정범위 내에서 길이 및 수평도를 측정함으로써 실내 작업을 지원하며, 실내 온도 이상시 웹서버와의 연동을 통해 휴대폰 사용자에 경보를 제공함으로써 실내 또는 차량 화재로부터 안전이 확보될 수 있도록 하였다. 제안된 방법의 정확성과 스마트 폰과의 연동 성능을 평가하기 위해 하나의 시작품을 제작하고 웹서버를 구축하였으며, 반복적인 실험에서 허용 가능한 5%내의 오차율을 보임으로써 유용성을 확인할 수 있었다.

• 제어로봇시스템학회논문지
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• 제18권12호
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• pp.1122-1131
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• 2012

This paper presents obstacle avoidance method for scout robot or industrial robot in unknown environment by using IR sensor and vision system. In the proposed method, robots share the information where the obstacles are located in real-time, thus the robots can choose the best path for obstacle avoidance. Using IR sensor and vision system, multiple robots efficiently evade the obstacles by the proposed cooperation method. No landmark is used at wall or floor in experiment environment. The obstacles don't have specific color or shape. To get the information of the obstacle, vision system extracts the obstacle coordinate by using an image labeling method. The information obtained by IR sensor is about the obstacle range and the locomotion direction to decide the optimal path for avoiding obstacle. The experiment was conducted in $7m{\times}7m$ indoor environment with two-wheeled mobile robots. It is shown that multiple robots efficiently move along the optimal path in cooperation with each other in the space where obstacles are located.

• 한국진공학회:학술대회논문집
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• 한국진공학회 2011년도 제40회 동계학술대회 초록집
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• pp.491-491
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• 2011

Transparent and flexible electronic devices that are light-weight, unbreakable, low power consumption, optically transparent, and mechanical flexible possibly have great potential in new applications of digital gadgets. Potential applications include transparent displays, heads-up display, sensor, and artificial skin. Recent reports on transparent and flexible field-effect transistors (tf-FETs) have focused on improving mechanical properties, optical transmittance, and performances. Most of tf-FET devices were fabricated with transparent oxide semiconductors which mechanical flexibility is limited. And, there have been no reports of transparent and flexible all-organic tf-FETs fabricated with organic semiconductor channel, gate dielectric, gate electrode, source/drain electrode, and encapsulation for sensor applications. We present the first demonstration of transparent, flexible all-organic sensor based on multifunctional organic FETs with organic semiconductor channel, gate dielectric, and electrodes having a capability of sensing infrared (IR) radiation and mechanical strain. The key component of our device design is to integrate the poly(vinylidene fluoride-triflouroethylene) (P(VDF-TrFE) co-polymer directly into transparent and flexible OFETs as a multi-functional dielectric layer, which has both piezoelectric and pyroelectric properties. The P(VDF-TrFE) co-polumer gate dielectric has a high sensitivity to the wavelength regime over 800 nm. In particular, wavelength variations of P(VDF-TrFE) molecules coincide with wavelength range of IR radiation from human body (7000 nm ~14000 nm) so that the devices are highly sensitive with IR radiation of human body. Devices were examined by measuring IR light response at different powers. After that, we continued to measure IR response under various bending radius. AC (alternating current) gate biasing method was used to separate the response of direct pyroelectric gate dielectric and other electrical parameters such as mobility, capacitance, and contact resistance. Experiment results demonstrate that the tf-OTFT with high sensitivity to IR radiation can be applied for IR sensors.

• KSII Transactions on Internet and Information Systems (TIIS)
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• 제4권3호
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• pp.258-272
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• 2010

The low-rate (LR) UWB is a promising technology for the ubiquitous sensor network (USN) due to its extremely low power consumption and simple transceiver implementation. However the limited communication range is a bottleneck for its widespread use. This paper deals with a new frame structure of class 4 active RFID multi-hop relay system based on ISO/IEC 18000-7 standard integrating with IEEE 802.15.4a LR-UWB PHY layer specification, which sets up a connection to USN. As a result of the vital importance of the coverage and throughput in the application of USN, further we analyze the performance of the proposed system considered both impulse radio UWB (IR-UWB) and chirp spread spectrum (CSS). Our simulation results show that the coverage and throughput are remarkably increased.

• 동아시아식생활학회지
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• 제20권5호
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• pp.735-742
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• 2010

식품 중 잠재적 위험 물질로 작용할 수 있는 BAs의 신속 검출을 위하여 전기전도성이 우수하다고 알려진 MWCNTs의 개질, 작업 전극의 제작, 효소반응기 제작을 통해 바이오센서 시스템을 구성하고 hydrogen peroxide와 주요 BAs 물질에 대한 감응도를 측정하였다. MWCTS의 성질을 향상시키기 위해 아민기를 도입하였고, 이를 FT-IR 스펙트럼을 통해 확인하였다. 아민기를 도입한 MWCNTs를 GCE에 고착시키고 PB 막을 입힌 후 cyclic voltammetry 반응을 비교한 결과, PB/MWCNT-$NH_2$/GCE 전극이 GCE에 비해 산화 전류는 8배 이상, 전체 전류는 25배 이상의 높은 전류 흐름을 보였으며, 미세한 전류 흐름의 측정도 용이해진 것으로 나타났다. 또한, carrier buffer의 pH를 달리하여 제작된 전극의 감응 전류를 비교한 결과, pH 7.0에서 전류의 감응도가 가장 높게 측정되었다. 과산화수소를 주입하여 전극의 성능의 검증한 결과, $0.5 {\mu}M{\sim}100 {\mu}M$ 범위에서 선형관계를 보였으며, 검출 한계는 $0.5{\mu}M$로 측정되었다. Histamine 표준 용액 주입 시 $1{\mu}M{\sim}100{\mu}M$ 범위에서 선형 관계를 나타내었고, tyramine은 histamine에 비해 약 95%, 2-phenylethylamine과 tryptamine은 histamine에 비해 각각 75%, 70% 수준의 감응도를 이용하여 구성된 바이오센서 시스템이 낮은 검출 한계와 높은 수준의 반응 감도를 나타내어 BAs를 측정하는데 좋은 장치임이 확인되었다.