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몬테칼로 방법을 사용한 HgCdTe에서의 전자 전송 특성에 관한 연구
유상동,곽계달 대한전자공학회 1998 電子工學會論文誌, D Vol.d35 No.2
Electron transport properties are investigated by Monte Carlo simulation in n-HgCdTe. The material is easily degenerated at low temperature or being slightly doped, and is characterized by small band gap and large nonparabolic factor. The degeneracy is incorporated in the Monte Carlo simulation by taking into account the electron-electron scattering and the pauli exclusion principle. In the conventional method, however, the electron-electron scattering rate was developed under the assumption of parabolic conduction band. A new formulation of the electron-electron scattering rate is develop considering the band nonparabolicity and overlap integral. The electron-electron scattering effects on the electron distribution,impact ionization coefficienty, electron temperature, drift velocity and electron energy are presented.
조영희,유상동,Geun-Don Kim 한국분자세포생물학회 2012 Molecules and cells Vol.33 No.1
The higher plants of today array a large number of small chloroplasts in their photosynthetic cells. This array of small chloroplasts results from organelle division via prokaryotic binary fission in a eukaryotic plant cell environment. Functional abnormalities of the tightly coordinated biochemical event of chloroplast division lead to abnormal chloroplast development in plants. Here, we described an abnormal chloroplast phenotype in an ethylene insensitive ethylene response1-1 (etr1-1) of Arabidopsis thaliana. Extensive transgenic and genetic analyses revealed that this organelle abnormality was not linked to etr1-1 or ethylene signaling, but linked to a sec-ond mutation in ACCUMULA-TION AND REPLICATION3 (ARC3), which was further verified by genetic complementation analysis. Despite the normal expression of other plastid division-related genes, the loss of ARC3 caused the enlargement of chloroplasts as well as the diminution of a photosynthetic protein Rubisco in etr1-1. Our study has suggested that the in-creased size of the abnormal chloroplasts may not be able to fully compensate for the loss of a greater array of small chloroplasts in higher plants.
열 병렬 SAR ADC를 내장한 CMOS 이미지 센서의 화소의 초기 전압 잡음 및 ADC 오프셋 제거 방안
김민규,구자승,유상동,홍성관,권오경 한국과학기술원 반도체설계교육센터 2015 IDEC Journal of Integrated Circuits and Systems Vol.1 No.1
본 논문에서는 열 병렬 successive approximation analog-to-digital converter (SA-ADC)를 내장한 소면적 저전력 CMOS 이미지 센서 (CIS)에 사용되는 correlated double sampling (CDS) 방식을 제안한다. 제안한 CDS 방식은 화소 출력의 초기 전압이 가지는 잡음과 각 ADC의 오프셋을 제거할 뿐만 아니라 추가 회로의 사용 없이 커패시터 digital-to-analog converter (DAC)에 연결 된 기준 전압을 조절하여 면적과 소비 전력을 줄였다. 테스트 칩은 0.18 ㎛ CMOS 공정으로 제작되었으며 SA-ADC를 가지는 50개의 리드아웃 채널 어레이를 내장한다. 각 리드아웃 채널은 14 ㎛ × 1116 ㎛의 면적을 차지하며 19.8 ㎼의 전력을 소비한다. 측정 결과 SA-ADC는 –0.82/+1.42 LSB의 DNL과 –1.31/+2.08 LSB의 INL를 가지며 10.5-비트의 ENOB를 가진다. 또한 제안한 CDS 방식을 통해 각 SA-ADC의 편차는 54.64 LSB에서 0.35 LSB로 감소한다.
하지 심부정맥혈전증 환자에서 폐색전증 발생에 미치는 인자
윤상섭,최승혜,김상동,조항주,박순철,김기환,안창혁,김정수,문인성,유승진,임근우,김지일 대한뇌혈관외과학회 2008 대한뇌혈관외과학회지 Vol.24 No.2
Purpose: Pulmonary embolism (PE) represents the most important and fatal complication of deep vein thrombosis (DVT), of which a dislodged thrombus is most commonly derived from the deep venous system of the lower extremity. The aim of this study is to define the incidence and risk factors of PE in DVT patients. Method: We retrospectively reviewed 248 patients with DVT in a lower extremity at Uijeongbu St. Mary's Hospital between January 2000 and August 2008 and they had received additional examinations for making the diagnosis of PE regardless of its symptoms. Result: There were 117 men and 131 women, and their mean age was 59 years old (range: 13∼91) at the time of diagnosis. There were 190 DVT-only patients and 58 patients with PE (the incidence rate of PE in the DVT patients: 23.8%). The gender ratio of the DVT only group was 1:1.3 (males: 83, female: 107) and the gender ratio of the DVT with PE group was 1:0.7 (males: 34, females: 24) (P<0.05). The risk factors of PE in the DVT patients were hypercoagulability (34%), cancer (23%), immobilization (17%), trauma/operation (10%), obesity (10%) and a past DVT history (7%). The idiopathic DVT patients had a relatively high cancer diagnosis rate (18.5%) and the majority of the newly detected cancer were from the chest or abdominal cavity. Conclusion: The incidence of DVT and PE is increasing and 23.8% of the DVT patients showed PE on their chest CT scan. The most significant risk factor for PE in the DVT patients was the male gender, yet an evaluation for cancer should be carefully done for idiopathic DVT patients because of their high rate of having cancer diagnosed.