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이규정,김인식,남효진,박철,Lee, Kyu-Chung,Kim, In-Sik,Nam, Hyo-Jin,Park, Chul 대한전자공학회 1994 전자공학회논문지-A Vol.31 No.7
Low cost high efficiency single crystal silicon solar cells for terrestrial applications have been fabricated by using inexpensive materials such as solar grade silicon wafer and pastes, and mass production processes such as screen printing and spray. Under 100 mW/cm$^2$ (AM 1.5) and $25^{\circ}C$ conditions conversion efficiency of 16.48% was obtained by anon fire-thru process and 15.55% by fire-thru process.
CT Findings of Quadricuspid Pulmonary Valve with Pulmonary Artery Aneurysm
이규정,용환석,이재욱,강은영 대한영상의학회 2018 대한영상의학회지 Vol.79 No.2
Quadricuspid pulmonary valve (QPV) with pulmonary artery aneurysm is an uncommon condition. QPV is typically clinically silent, so it is often diagnosed after death. However, recent advancements in imaging modalities, such as computed tomography (CT), have allowed more frequent incidental diagnosis of QPV in living adults. We report a case of QPV with pulmonary artery aneurysm in an asymptomatic adult; the condition was detected by CT aortography but was not discernible in echocardiography. Following the case presentation, we review the prior related literature.
Modified automotive organic friction materials through infiltration of liquid carbon precursors
이규정,Wu Ting-Yu,Lin Hsun-Yu,Cheng Huy-Zuㅍ,Wang Chih-Feng 한국탄소학회 2019 Carbon Letters Vol.29 No.4
This research combines the liquid carbon precursor infiltration process for carbon/carbon composites with the fabrication procedure for organic, carbon-matrix friction materials in automotive. In the densification process, different liquid carbon precursors and numbers of densification cycle are adopted to investigate the influence on physical and mechanical properties, microstructure and tribological behavior. Experimental results indicate that the infiltration of liquid carbon precursors could improve the physical, mechanical properties and tribological performances of organic friction materials. The open porosity decreases with the number of densification cycle. Both bulk density and hardness increase with the number of densification cycle. The resin-based specimens show higher hardness and lower open porosity than those of the pitch-based specimens after each densification cycle. The tribological measurement of specimens with different carbon precursors shows that the pitch-based specimen shows lower and more stable friction coefficients and exhibits lower weight losses in comparison with other carbon precursors. Morphological observations show that a large area of smooth lubricative film was easily presented on the worn surfaces of the pitch-based specimens, whereas it was seldom observed on the worn surfaces of the preform specimen and resin-based specimens.
산화물 반도체 박막 가스센서 어레이의 제조 및 수율 개선
이규정,류광렬,허창우 한국정보통신학회 2002 한국정보통신학회논문지 Vol.6 No.2
반도체 제조공정과 미세가공 기술을 이용하여 30$0^{\circ}C$의 동작온도에서 약 60㎽의 전력소모를 갖는 산화물 반도체 박막 가스센서 어레이를 제조하였다. 멤브레인의 우수한 열적 절연은 0.1$\mu\textrm{m}$ 두께의 Si$_3$N$_4$와 1$\mu\textrm{m}$ 두께의 PSG의 이중 층에 의한 것으로, 각각 LPCVD(저압화학 기상증착)와 APCVD(대기압 화학 기상증착)에 의해 제조되었다. 센서 어레이의 4가지 산화물 반도체 박막 감지물질로는 1wt.%Pd가 도핑된 SnO$_2$, 6wt.% $Al_2$O$_3$가 도핑된 ZnO, WO$_3$, ZnO를 이용하였으며, 제조된 초소형 산화물 반도체 박막 가스센서 어레이는 여러 가지 가스의 노출시 유용한 저항 변화를 나타내었고 감도는 감지 물질에 강하게 의존함을 알 수 있었다. 센서 소자의 공정 수율을 증진시키기 위하여 히터 부위를 함몰하는 공정 방법을 취하였으며, 그 결과 월등한 수율 개선을 도모할 수 있었다. A thin film oxide semiconductor micro gas sensor array which shows only 60㎽ of power consumption at an operating temperature of 30$0^{\circ}C$ has been fabricated using microfabrication and rnicrornachining techniques. Excellent thermal insulation of the membrane is achieved by the use of a double la! or structure of 0.1${\mu}{\textrm}{m}$ thick Si$_3$N$_4$ and 1${\mu}{\textrm}{m}$ thick phosphosilicate glass(PSG) prepared by low pressure chemical vapor deposition(LPCVD) and atmospheric-pressure chemical-vapor deposition(APCVD), respectively. The sensor way consists of such thin film oxide semiconductor sensing materials as 1wt.% Pd-doped SnO$_2$, 6wt.% AI$_2$O$_3$-doped ZnO, WO$_3$ and ZnO. The thin film oxide semiconductor micro gas sensor array exhibited resistance changes usable for subsequent data processing upon exposure to various gases and the sensitivity strongly depended on the sensing layer materials. Heater Part of the sensor structure has been modified in order to improve the process yield of the sensor, and as a result of modified heater structure improved process yield has been achieved.
$SnO_2$ 산화물 반도체의 비정상적 전류 - 전압 특성과 가스센서로의 응용
이규정,윤호군,허창우,Lee Kyu-chung,Yoon Ho-Kun,Hur Chang-Wu 한국정보통신학회 2004 한국정보통신학회논문지 Vol.8 No.7
산화물 반도체의 비정상적 전류-전압 특성을 조사하였고, 그 전류-전압 특성을 산화물 반도체 가스센서에 적용하여 히터없이 감지막의 자기발열 메커니즘에 의해 환원성 가스를 검지하는 새로운 방법을 제시하였다. 평면 구조의 후막 가스센서는 WO3가 도핑된 SnO2 산화물 반도체를 이용하여 스크린 프린팅 방법으로 제조하였다. 감지막에 공급된 전압은 감지막의 발열을 초래하고 이 센서에 가스가 노출될 경우, 가스 감지막 표면의 재 반응에 의하여 전류는 급격히 변화하고 이로써 가스를 검지 할 수 있게 되었다. 이 가스 검지 구조의 가장 특이하고 매력적인 면은 검지를 위해 모든 산화물 반도체 가스센서가 가지고 있어야 하는 히터가 필요 없다는 것이다. 이 새로운 감지 방법을 C2H5OH 가스검지에 적용시켜 보았다. Abnormal current-voltage characteristics of an oxide semiconductor have been investigated and a novel method of detecting reducing gases utilizing self-heating mechanism of sensing layer without an additional heater has been developed. Planar-type sensors based on WO3-doped SnO2 were fabricated using a screen-printing technique. The applied voltage across the sensing layer caused heating of the sensing layer and the current abruptly varied upon exposure to a gas mostly as a result of surface reactions. A unique and fascinating aspect of the gas sensing scheme is that no additional heater is necessary for detection. The new sensing method has been applied to C2H5OH gas in this preliminary work.
TWS 레이더 추적을 위한 가중 점수 기반 추적 초기화알고리즘 연구
이규정,곽노준,권지훈,양은정,김관성 한국군사과학기술학회 2019 한국군사과학기술학회지 Vol.22 No.1
In this paper, we propose the track initiation algorithm based on the weighted score for TWS radar tracking. This algorithm utilizes radar velocity information to calculate the probabilistic track score and applies the Non- Maximum-Suppression(NMS) to confirm the targets to track. This approach is understood as a modification of a conventional track initiation algorithm in a probabilistic manner. Also, we additionally apply the weighted Hough transform to compensate a measurement error, and it helps to improve the track detection probability. We designed the simulator in order to demonstrate the performance of the proposed track initiation algorithm. The simulation result show that the proposed algorithm, which reduces about 40 % of a false track probability, is better than the conventional algorithm.