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Yi, Sangmin,Oh, Je-Seok,Youn, Gap-Hee,Chung, Kwang,Jung, Seunggon,Park, Hong-Ju,Oh, Hee-Kyun,Kook, Min-Suk Korean Academy of Dental Science 2014 Journal of korean dental science Vol.7 No.1
Few dental procedures are potentially life-threatening. Note, however, that a dental extraction can result in preventable death. Severe post-extraction bleeding can occur, which may give rise to an alarming situation if there is any delay in detecting and managing the problem. The most immediate danger for a healthy patient with severe post-extraction hemorrhage is airway compromise. Acute airway obstruction from post-extraction hematoma is relatively uncommon, but it may occur with fatal consequences if there is any reluctance to maintain the airway clearance. Therefore, dentists and oral and maxillofacial surgeons should have clear understanding of the problem and measures to control it. Active bleeding that is not controlled by local measures in a dental office should be referred to the nearest hospital emergency department as soon as possible for appropriate management.
노인의 편안한 생활을 지원하는 센서 통합 관리 시스템: knu-SCS
이상민(Sangmin Yi),진평수(Pyungsu Jin),조승호(Seungho Cho),김형태(Hyoungtae Kim) 한국컴퓨터정보학회 2007 한국컴퓨터정보학회지 Vol.15 No.1
선진각국에서 고령화 문제를 해결하기 위하여 고령친화 산업과 관련된 많은 연구들이 진행되고 있다. 본 논문에서는 노인 요양 또는 복지 시설 내 노인들의 거주 환경 변화 및 거주자의 활동 양상을 측정하는 유비쿼터스 노인케어 시스템 knu-SCS(KangNam Ubiquitous Senior Care System)에 대하여 연구하였다. knu-SCS 시스템은 조도, 습도, 온도 센서, 카메라 등으로 구성되며, 각종 센서들이 감지한 데이터를 저장, 가공, 분석하여 데이터베이스에 저장을 하고 저장된 데이터들을 사용자들에게 시각적으로 제시하기 위하여 센서 웹을 구현하였다. 센서 웹에서 제공하는 데이터들은 일상적인 노인 행동 및 생활환경을 인지할 수 있는 자료가 되므로, 이를 기초로 노인들이 겪을 수 있는 건강상 문제, 갑작스런 생활의 변화감지, 일상생활의 불편함을 해소하는 등 노인케어에 효과적으로 활용될 수 있다.
일상생활 감지용 센서를 위한데이터베이스의 설계 및 구현
이상민(Sangmin Yi),장신열(Shinyeol Jang),조승호(Seungho Cho),조석향(Seokhyang Cho) 한국정보과학회 2007 한국정보과학회 학술발표논문집 Vol.34 No.1C
선진각국에서 고령화 문제를 해결하기 위하여 고령친화 산업과 관련된 많은 연구들이 진행되고 있다. 본 논문에서는 노인 요양 또는 복지 시설내 노인들의 거주 환경 변화 및 거주자의 활동 양상을 측정하는 노인케어 유비쿼터스 시스템 knu-SCS(KangNam Ubiquitous Senior Care System)에 대하여 연구하였다. knu-SCS 시스템은 조도, 습도, 온도 센서, 웹 카메라 등으로 구성되며, 각종 센서들이 감지한 데이터를 저장, 가공, 분석하기 위하여 데이터베이스를 설계 및 구현하였다. 또한, 데이터베이스에 저장된 데이터들을 사용자들에게 시각적으로 제시하기 위하여 센서 웹을 구현하였다. 센서 웹에서 제시하는 데이터들은 일상적인 노인 행동 및 생활환경을 인지할 수 있는 자료가 되므로, 이를 기초로 노인들이 겪을 수 있는 건강상 문제나 일상생활의 불편함을 해소하는 등 노인 케어에 활용될 수 있다.
Yi, Ahra,Chae, Sangmin,Lee, Hanbin,Kim, Hyo Jung The Royal Society of Chemistry 2019 Journal of Materials Chemistry A Vol.7 No.48
<P>Solvent vapor annealing (SVA) is an effective post-treatment process to improve the quality of crystals and grains in metal halide perovskite films. Whereas SVA has been successfully adopted for the fabrication of perovskite films <I>via</I> the conventional two-step method, its adaptation to the simple single-step perovskite film deposition method has been limited because of the rapid transition of the precursor to the perovskite structure. In the present study, we demonstrate highly efficient and stable single-step-based inverted perovskite solar cells fabricated with perovskite films prepared using dimethyl sulfoxide (DMSO) and water as a combined solvent in SVA treatment. The treatment with DMSO alone resulted in the growth of large grains (∼900 nm) in the lateral direction at the surface region; however, voids and defects were observed in the vertical direction at the bottom interfacial region of the CH3NH3PbI3 layer, which resulted in poor device properties. Interestingly, the combined DMSO-water induced vertical growth of almost single grains and the healing effect of water improved the grain quality. As a result, we fabricated co-SVA CH3NH3PbI3 devices with a power conversion efficiency (PCE) of 19.52%. This PCE, which is much higher than that of pristine devices, was attributed to reduced nonradiative recombination. In addition, co-SVA solar cells displayed remarkable stability and their universality in various types of perovskite materials was demonstrated. We anticipate that our proposed process and mechanism will be widely used in the future development of perovskite-based devices.</P>
Yi, Ahra,Chae, Sangmin,Hong, Seungyeon,Lee, Hyun Hwi,Kim, Hyo Jung The Royal Society of Chemistry 2018 Nanoscale Vol.10 No.45
<P>Recently, the sequential (Sq) process, which forms nanoscale network structures from quasi-solid-state inter-diffusion through swelling and annealing, is considered to be one of the most efficient methods for fabricating organic solar cells and blend films. Here, we examined the effect of the crystallinity and orientation of poly(3-hexylthiophene) (P3HT) molecules on the formation of the nanostructure by carrying out a Sq process using various solvents with different boiling points. We showed that the moderate crystallinity promoted suitable inter-diffusion between the donor (P3HT) and acceptor ([6,6]-pentadeuterophenyl C61 butyric acid methyl ester, PC60BM), and hence was important for achieving high-performance solar cells using Sq processing. Nanostructure formation by inter-diffusion was investigated and visualized by taking a combination of grazing-incidence wide-angle X-ray scattering (GIWAXS) and time-of-flight secondary ion mass spectrometry (ToF-SIMS) measurements. In addition, our Sq-processed solar cell yielded a device efficiency as high as 3.25%, and was also impressive because it was made with an eco-friendly solvent and using a short-duration annealing process, in contrast to the conventional BHJ process. The present findings provided advanced insight into the Sq process, and we anticipate this efficacious sequential process to contribute not only to the development of higher-efficiency organic solar cells but also to the fabrication of functional blend films.</P>
[I.T.S.부문] 차량 궤적 예측기법을 이용한 정지/서행 순항 제어
조상민(Sangmin Cho),이경수(Kyongsu Yi) 한국자동차공학회 2001 한국자동차공학회 춘 추계 학술대회 논문집 Vol.2001 No.11_1
This paper proposes a vehicle trajectory prediction method for application to vehicle-to-vehicle distance control. This method is based on 2-dimensional kinematics and a Kalman filter has been used to estimate acceleration of the object vehicle. The simulation results using proposed control method shows that the relative distance characteristics can be improved via the trajectory prediction method compared to the customary Stop & Go cruise control systems which makes the vehicle remain at a safe distance from a preceding vehicle according to the driver's preference, automatically slow down and come to a full stop behind a preceding vehicle
합성곱 신경망(CNN)을 이용한 U-Net 기반의 인공지능 안면 정면화 모델
이상민 ( Sangmin Lee ),손원호 ( Wonho Son ),진창균 ( Changgyun Jin ),김지현 ( Ji-hyun Kim ),김지윤 ( Jiyun Kim ),박나은 ( Naeun Park ),김가은 ( Gaeun Kim ),권진영 ( Jin Young Kwon ),이혜리 ( Hye Yi Lee ),김종완 ( Jongwan Kim ),오덕신 한국정보처리학회 2020 한국정보처리학회 학술대회논문집 Vol.27 No.2
안면 인식은 Face ID를 비롯하여 미아 찾기, 범죄자 추적 등의 분야에 도입되고 있다. 안면 인식은 최근 딥러닝을 통해 인식률이 향상되었으나, 측면에서의 인식률은 정면에 비해 특징 추출이 어려우므로 비교적 낮다. 이런 문제는 해당 인물의 정면이 없고 측면만 존재할 경우 안면 인식을 통한 신원확인이 어려워 단점으로 작용될 수 있다. 본 논문에서는 측면 이미지를 바탕으로 정면을 생성함으로써 안면 인식을 적용할 수 있는 상황을 확장하는 인공지능 기반의 안면 정면화 모델을 구현한다. 모델의 안면 특징 추출을 위해 VGG-Face를 사용하며 특징 추출에서 생길 수 있는 정보 손실을 막기 위해 U-Net 구조를 사용한다.
Chae, Sangmin,Yi, Ahra,Kim, Hyo Jung ELSEVIER SCIENCE B.V. AMSTERDAM 2019 Materials today energy Vol.14 No.-
<P><B>Abstract</B></P> <P>Along with the development of perovskite materials, which have enormous potential for optoelectronics such as solar cells and light-emitting diode devices, numerous organic semiconductor polymers, which have been critically adopted into the hole and electron transporting layers, have been synthesized and studied. In n–i–p-structured perovskite solar cells, various outstanding polymer materials have been successfully applied. However, in p–i–n-structured solar cells, the hydrophobic nature of the polymers makes the sequential deposition of a perovskite thin film difficult. Several destructive methods have been proposed; however, a more efficacious and fundamental method is urgently needed. Here, we present a nondestructive polymer hole-transporting layer (HTL) thin-film formation process based on molecular engineering via a simple solvent process. When we used various solvents with different volatilities, perovskite film formation was achieved on polymer thin films formed from highly volatile solvents. In addition, we elucidated the structure and orientation of the molecules in the films and revealed that the molecular structure of face-on orientation for the horizontally aligned hydrophobic alkyl groups induced a lower surface energy of the film, as determined by grazing-incidence wide-angle X-ray scattering (GIWAXS) measurements. Furthermore, the tilt angle of the molecules, which was calculated from the results of quantitative near-edge X-ray absorption fine structure (NEXAFS) analysis, was found to correlate with the surface energy. This result provides guidance for polymer-orientation and surface-energy studies, and perovskite solar cells fabricated using the polymer HTL demonstrated good durability and flexibility. We expect that our approach represents a new route for fabricating p–i–n-structured solar cells and that numerous valuable p-type conjugated polymers will be developed via our proposed molecular engineering process.</P> <P><B>Highlights</B></P> <P> <UL> <LI> A nondestructive polymer hole-transporting layer (HTL) thin-film formation process has been developed for inverted planar perovskite solar cells based on molecular engineering via a simple solvent process. </LI> <LI> A combination of the X-ray techniques reveals that crystalline structure and orientation of the polymer molecules affect the surface energy of the resultant thin film. </LI> <LI> Perovskite solar cells fabricated using the molecular engineering process has demonstrated excellent flexibility and durability. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>