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Jimin Chae,Seoung-Hun Kang,Young-Kyun Kwon,Mann-Ho Cho 한국진공학회(ASCT) 2019 Applied Science and Convergence Technology Vol.28 No.6
Topological insulators (TIs) have gained considerable attention owing to their topologically protected helical edge states called topological surface states. To employ TIs, it is necessary to reduce film thickness and suppress effects from the bulk carrier. When the film thickness is less than 5 quintuple layers (QLs), the top and bottom surface states overlap, thereby increasing surface bandgap. In this study, we investigate the suppression of the hybridization of surface states in a 3-QL Bi₂Se₃/graphene heterostructure. In the 3-QL Bi₂Se₃ film grown on graphene, surface states affected by strain, and band bending effects from graphene are localized to the top and bottom and possess a closed bandgap. Further, we investigated transport properties in the 3-QL Bi₂Se₃/graphene heterostructure and verified the independent transport channels of Bi₂Se₃ and graphene, and the long coherence length of 534 nm. In conclusion, the closed bandgap and long coherence length in the 3-QL Bi₂Se₃/graphene heterostructure implies that the proximity effect in a TI/non-TI heterostructure can be attractive for future applications, beyond the physical and topological thickness limit.
Smart CMOS Image Sensor With High SBR and Subpixel Resolution for Light-Section-Based Range Finding
Jimin Cheon,Youngcheol Chae,Dongsoo Kim,Seunghyun Lim,Inhee Lee,Hyoung-Ki Lee,Dong Jo Kim,Gunhee Han IEEE 2009 IEEE transactions on electron devices Vol.56 No.11
<P>Light-section (LS)-based range finders are commonly used for obstacle recognition in home service robots and autonomous vehicles. This paper proposes a smart CMOS image sensor for LS-based range finding. The proposed sensor can detect the laser light, even under very strong ambient-illumination levels by using a multiple-capture frame-correlated double sampling (F-CDS), which is realized with an inverter-based switched-capacitor F-CDS accumulator. The proposed sensor also includes on-chip winner-take-all circuits that significantly reduce the software and hardware complexity of interpolation for the subpixel resolution. The prototype chip was fabricated using a 0.35-mum CMOS process. The measurement results show that the proposed sensor can detect a laser line with an intensity that is 56.5 dB lower than that of the ambient illumination, providing a spatial resolution of plusmn0.16 pixels.</P>
A Single-Chip CMOS Smoke and Temperature Sensor for an Intelligent Fire Detector
Jimin Cheon,Jeonghwan Lee,Inhee Lee,Youngcheol Chae,Youngsin Yoo,Gunhee Han IEEE 2009 IEEE SENSORS JOURNAL Vol.9 No.8
<P>A single-chip CMOS smoke and temperature sensor for use as an intelligent fire detector is proposed. The proposed smoke sensor measures smoke density based on the light-scattering method. The temperature sensor is integrated with the smoke sensor not only to sense heat from a fire but also to compensate for the temperature dependency of the smoke sensor. The prototype chip includes an on-chip photodiode (PD), pixel circuit, correlated double sampling (CDS) circuit, and analog-to-digital converter (ADC). The prototype chip was fabricated using a 0.35-mu m CMOS process and was placed inside the smoke detection chamber, while the thermistor for the temperature sensor is placed outside the chamber. The measurement results show plusmn 1% smoke detection accuracy over the range 4% ~ 25% and plusmn1degC temperature-sensing accuracy over the range 25degC ~ 95degC. The power consumption of the prototype chip is 220 nW, excluding the infrared light-emitting diode (IR LED).</P>
유지민(Jimin Yoo),김소영(Soyoung Kim),조은아(Eun-ah Cho),조은혜(Eunhye Cho),최선주(Sunju Choi),정윤주(Yoonjoo Jeong),하병집(Byungjhip Ha),채희정(Hee Jeong Chae) 한국생물공학회 2010 KSBB Journal Vol.25 No.2
본 연구에서는 이중결합을 가진 불포화화합물로 제조나저장 시 열과 산화 (빛)에 의해 쉽게 파괴되어 활성이 감소하여 응용범위에 한계가 있는 아스타잔틴의 안정성 향상을 위하여 나노리포좀 제형기술을 이용하였다. 제형안정성 평가를 통하여 리포좀 제조조건 및 조성비를 확립하였고, 포접나노리포좀을 제조하여 포접전의 아스타잔틴과 안정성을 비교 검토하였다. 아스타잔틴을 포접하여 포접나노리포좀 제조 시포접전의 아스타잔틴에 비해 열에 대한 안정성이 2배 정도 향상되고, UV 안정성 또한 3배 향상된 것을 확인하였다. 이상의 결과로부터 아스타잔틴을 포접한 포접나노리포좀은 안정성이 우수한 기능성 원료로서 산업적으로 용도를 넓히고 부가가치를 더욱 향상시킬 수 있을 것으로 기대된다. Astaxanthin is an unsaturated compound with a double bond. So it is easily decayed by heat and oxidation (light) during its storage and processing of it. Nanoliposome formulation technology was utilized to improve the stability of astaxanthin. Nanoliposome preparation conditions were established and the stability of astaxanthin encapsulated nanoliposome and free astaxanthin was investigated. Thermal stability and UV-stability of astaxanthin encapsulated nanoliposome increased up to two times and tree times, respectively. Astaxanthin encapsulated nanoliposome could be used as a stable functional material for industrial purposes.
무인항공기 정밀 센서모델링을 통한 대축척 수치도화 가능성 평가
임평채 ( Pyung-chae Lim ),김한결 ( Han-gyeol Kim ),박지민 ( Jimin Park ),이수암 ( Sooahm Rhee ) 대한원격탐사학회 2020 大韓遠隔探査學會誌 Vol.36 No.6
무인항공기(UAV: Unmanned Aerial Vehicle)는 저고도 비행으로 인해 고해상도 영상을 취득할 수 있으며, 수시촬영이 가능하여 지도제작에 있어 수시갱신이 가능하다. 이러한 이점으로 인해 무인항공기 영상을 이용한 대축척 수치지도 제작 가능성에 대한 연구가 활발히 진행되고 있다. 정밀한 수치지도는 디지털트윈이나 스마트시티의 기반 데이터로 활용될 수 있다. 정밀한 수치지도를 제작하기 위해서는 지상기준점을 이용한 정밀 센서모델링이 반드시 선행되어야 한다. 본 연구에서는, 자체 개발한 정밀 센서모델링 알고리즘을 통해 무인항공기 영상의 기하모델을 수립하였다. 그리고 수치지도를 제작하여 대축척 수치도화 가능성을 평가하였다. 연구 데이터는 인천 간석동과 서울 여의도를 대상으로 영상 및 지상기준점을 취득하였다. 정밀 센서모델링 정확도 분석 결과, 두 지역에 대해서 체크 점 평균오차 3 픽셀 이내, RMSE 4 픽셀 이내의 높은 정확도를 확인하였다. 수치도화 정확도 분석 결과, 국토지리정보원에서 고시한 1:1,000 세부도화 수평오차(0.4 m) 및 표고오차(0.4 m)를 만족하는 범위의 정확도를 확인하였다. 따라서 본 연구에서 자체개발한 정밀 센서모델링 기술은 무인항공기 영상의 1:1,000 대축척 수치도화 제작 가능성을 시사한다. UAV (Unmanned Aerial Vehicle) can acquire high-resolution images due to low-altitude flight, and it can be photographed at any time. Therefore, the UAV images can be updated at any time in map production. Due to these advantages, studies on the possibility of producing large-scale digital maps using UAV images are actively being conducted. Precise digital maps can be used as base data for digital twins or smart cites. For producing a precise digital map, precise sensor modeling using GCPs (Ground Control Points) must be preceded. In this study, geometric models of UAV images were established through a precision sensor modeling algorithm developed in house. Then, a digital map by stereo plotting was produced to evaluate the possibility of large-scale digital map. For this study, images and GCPs were acquired for Ganseok-dong, Incheon and Yeouido, Seoul. As a result of precision sensor modeling accuracy analysis, high accuracy was confirmed within 3 pixels of the average error of the checkpoints and 4 pixels of the RMSE was confirmed for the two study regions. As a result of the mapping accuracy analysis, it satisfied the 1:1,000 mapping accuracy announced by the NGII (National Geographic information Institute). Therefore, the precision sensor modeling technology suggested the possibility of producing a 1:1,000 large-scale digital map by UAV images.
Primary copper-associated chronic hepatitis without COMMD1 mutation in a Dalmatian: a case report
Sumin Yun,Dohee Lee,Jimin Oh,Yeon Chae,Taesik Yun,Yoonhoi Koo,Mhan-Pyo Yang,Byeong-Teck Kang,Hakhyun Kim 대한수의학회 2022 大韓獸醫學會誌 Vol.62 No.4
A 12-year-old intact male Dalmatian dog presented hyporexia and vomiting for 1 week. Blood analysis revealed increased liver enzyme activity. Histopathological examination of the liver confirmed chronic hepatitis with fibrosis and necrosis. Copper staining revealed marked copper accumulation (2,770 ppm; normal range, 200 to 400 ppm), prominent in the centrilobular region, and compatible with copper-associated chronic hepatitis. However, copper metabolism domain containing 1 (COMMD1) mutation predisposing to copper accumulation in the liver tissue was not identified. The dog received medications but died 1 month after first visit. This is the first case of primary copper-associated hepatitis without COMMD1 mutation in a Dalmatian dog in South Korea.