• Journal of the Korea Institute of Information and Communication Engineering
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• v.15 no.5
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• pp.1183-1188
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• 2011

The novel metal position detection method is proposed where conventional techniques, in high temperature, moisture and particle environment, are not able to be applied. It is known that electronic devices, utilizing microwave, ultrasonic or optical technique, are hard to apply for sensing application where temperature is exceeding above 300 degree centigrade. Metal position detection technique, which was consisted with passive elements facing hot sensing surface, utilizing electromagnetic wave was investigated, and the metal detection sensitivity was measured by varying sensor frequency and sensing distance. Measurement result in laboratory test set-up showed position measurement resolution up to 1mm, when distance between two sensing elements were 500mm, and possibility to measure position of hot metal sheet having very high surface temperature.

• The Journal of the Korea institute of electronic communication sciences
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• v.9 no.2
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• pp.161-166
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• 2014

This Electromagnetic metal piece detection sensor, having high sensitivity even under high humidity and dust density, using LVDT was investigated. Metal detection characteristics using phase detection method, for 3 frequencies covering ELF and LF band, were experimentally measured. It was found that the sensitivity for metal and animal food, in which metal piece was included, was exponentially increased as frequency increased. Reducing cutoff frequency of LPF after PD was found to be effective to proportionally increase sensitivity. Also the sensitivity of metal piece detection was enhanced by optimizing BPF bandwidth and SNR. Metal piece detection limit using available ferrous test samples was found to be 0.7mm diameter from the experiment using 50kHz, in ELF band, which was known to have better selectivity to animal food. is an example of ABSTRACT format.

• Fire Science and Engineering
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• v.17 no.4
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• pp.64-69
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• 2003

Low story apartments and housings with manual fire extinguishers are very susceptible to fro damages, when people are absent or there are old and weak peoples. To reduce such fire damages, automatic fire suppression at the early stage is very important, and thus automatic and cost-effec-tiye fire extinguisher was developed. This study revealed that the reaction temperature and response time are greatly influenced by the small thickness variation of the detective parts and heating rates. The influence of the thickness of the detective parts was shown significant when the heating rate was low, The reduction in the thickness could lower the response time to 40seconds.

• Prospectives of Industrial Chemistry
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• v.23 no.3
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• pp.1-16
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• 2020

식품 산업에서 제품의 품질을 향상시키기 위해서는 약한 세기의 맛에서도 다양한 종류의 맛을 감지해낼 수 있어야만 한다. 이러한 목적 달성을 위해서 2차원 물질과 금속유기골격체(metal-organic framework, MOF)를 이용한 미각 감지 센서에 대한 연구들이 한창 진행 중이다. 2차원 물질 및 MOF는 고유한 특성으로 인하여 현재 다양한 분야에서 많은 관심을 받아오고 있으며 화학 및 생화학 감지 등 다양한 분야에서도 응용될 수 있다. 본 기고문에서는 미각 감지 응용에서 2차원 물질과 MOF의 최신 연구동향을 다루고자 한다. 본 기고문을 통하여 미각 감지 응용 분야에서 2차원 물질과 MOF의 작용 메커니즘을 이해하고 현재의 연구 현황 및 앞으로의 발전 방향을 알아보고자 한다.

• Proceedings of the KIEE Conference
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• 2004.07c
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• pp.1691-1693
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• 2004

전해질 용액 중에서 내부 이온화산에 의한 드리프트 특성이 거의 없는 장기안정성과 pH 농도 감지 특성이 우수하지만 알칼리 금속 양이온 감지특성이 열악한 silicon nitride 박막의 이온 감지특성을 변화시키기위하여, 저온화학기상증착법(LPCVD)으로 제작된 silicon nitride 박막에 B 및 Cs를 이중이온주입시켰다. 이온수입이 되지 않은 silicon nitride 박막과 B 및 Cs가 이중이온주입된 박막의 전해질 용액 중 pH, pNa, pK, pRb 및 pCs 농도 감지특성을 조사하여 비교하였다. 이중이온주입된 샘플은 이온주입이 되지 않은 샘플에 비해 그 전해질 용액 중 pH 농도 감지도가 현저히 감소한 반면, 전해질 용액 중 알카리 금속이온농도 감지도는 이온주입되지 않은 샘풀에 비해 현저히 증가하는 특성을 보였다.

• Journal of IKEEE
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• v.22 no.4
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• pp.1062-1067
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• 2018

In this study, the research processed with a chemical sensor for measuring trace amount of heavy metal ions which is based on the requirements of the efficient sensing technology as recent equipment is applies molecular system in the chemical sensing section that can precisely recognizing selective target substance and transmit its data to physical signal as a result. In this research is concentrated on realize highly precise by utilizing SPR sensor application of recognition functional sensing membrane. Consequently, according to DTSQ-dye sensing membrane, the resonance angle from low-concentration to the highest concentration $10^{-4}M$ of $Ag^+$ ion is $2.17[^{\circ}]$ and this result indicating 4.3 times larger resonance angle changes compare to the other metal substance. Based on SQ-dye sensing membrane, the difference of resonance angle between low concentration and the highest concentration $10^{-4}M$ of $Cu^{2+}$ ion is $2.3[^{\circ}]$ and this outcome is indicating 4.5 times greater resonance angle change to the other metal substance.

• Proceedings of the Korea Information Processing Society Conference
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• 2014.04a
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• pp.848-849
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• 2014

특정 물체 혹은 객체 추적 기술은 해당 객체를 검출 및 인식하고 움직임을 감지하는 기능으로 구현된다. 시스템 자동화와 관련하여 이러한 영상 인식 및 추적 기술의 구현은 특정 물체를 정확히 감지 및 추적할 수 있는가가 성공의 관건이 되고 있다. 하지만 기존의 영상추적 기반 자동화 시스템은 이를 구현하기 위해 별도의 관리자가 카메라로부터 전송되는 영상을 모니터링 해야 하는 등 인력의 결합이 필수적이며, 결국 비용상승이라는 단점을 내포하고 있다. 이에 반해 최근 개발되고 있는 물체감지 및 추적 시스템의 구현은 별도의 모니터링 인력 없이도 특정 물체를 자동으로 식별하고, 움직이는 물체를 지속적으로 추적할 수 있다는 점에서 보다 효율적 이다. 본 연구에서는 특히 금속 화물 물체의 감지 및 추적 시스템 구현에 초점을 맞추고 있다.

• The Journal of the Korea institute of electronic communication sciences
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• v.12 no.6
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• pp.1057-1064
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• 2017

High sensitivity magnetic sensor having foreign metal detection capability is proposed utilizing giant magneto-impedance effect. Strip sensor showed the increasing output voltage when the external magnetic field was applied along with strip from strip grounding point, although the initial DC voltage varied depending on the pointing direction of strip sensor. Proposed sensor was able to eliminate more than half of background noise using active noise filter to achive high sensitivity, and it showed the capability to detect magnetized foreign metal object independent of ambient electro-magnetic noise and earth magnet. In case of ferrous sphere, the metal detection up to 0.8mm diameter was experimentally demonstrated at 5mm distance from strip sensor.

• Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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• 2013.05a
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• pp.597-598
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• 2013

A lot of fire and crime accidents are caused to a significant national loss. For example, the network and power facilities in national industry facilities, the fire risk region in large scale factories such as nuclear and thermal power plants, large-sized buildings, cultural properties, metal and steel mills, chemical plants, oil refineries. The development of a fire detection system that can detects the temperature and movement of objects as high-level quality is essential to prevent these incidents and accidents fundamentally. In this paper, the fire detection system based on infrared thermal imaging & CCD camera id designed to solve these problems.

• Journal of Sensor Science and Technology
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• v.7 no.2
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• pp.111-116
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• 1998

The simple solid electrolyte carbon dioxide sensor with heaters were fabricated by using Li ionic conductor. Two Au electrodes were used for the reference and sensing electrode respectively. Two types of gas sensors, type ( I ) and type (II), were fabricated. Type ( I ) sensor was fabricated by the method of melting and crystallizing alkali metal carbonate at the temperature of $420{\sim}500^{\circ}C$. The sensing membrane of type (II) sensor was formed by the printing method on sensing electrode after metal carbonate was mixed with binder. The response characteristics of sensors fabricated for the carbon dioxide were investigated for a range of $CO_{2}$ concentration from 950 ppm to 9,950 ppm at operating temperature $420^{\circ}C$. Type ( I ) sensor and type (II) sensor showed the sensitivity of 62 mV/decade and 65 mV/decade respectively. The emf/decade of type (II) sensor tested at $420^{\circ}C$ almost followed the theoretical value of Nernst's equation and showed stable response characteristics with the fast response time of $15{\sim}20$ sec. Also type (II) sensor showed excellent stability and reproduction properties for 60 days.