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기준저항 보상회로를 이용한 비냉각형 볼로미터 검출회로의 설계에 관한 연구
유승우,곽상현,정은식,성만영,Yu, Seung-Woo,Kwak, Sang-Hyeon,Jung, Eun-Sik,Sung, Man-Young 한국전기전자재료학회 2009 전기전자재료학회논문지 Vol.22 No.2
As infrared light radiates, the CMOS Readout IC (ROIC) for the microbolometer typed infrared sensor detects voltage or current which is caused by the variation of resistance in the bolometer sensor. A serious problem we may have in designing the ROIC is the value of bolometer and reference resistors will be changed due to process variation. Since each pixel does not have the same value of resistance, fixed pattern noise problems happen during the sensor operations. In this paper, we propose a novel technique to compensate the fluctuation of reference resistance with taking account of process variation. By using a comparator and a cross coupled latch, we will make the value of reference resistor same as the bolometer's.
유승우,이한신,강이구,성만영,Yu, Seung-Woo,Lee, Han-Shin,Kang, Ey-Goo,Sung, Man-Young 한국전기전자학회 2007 전기전자학회논문지 Vol.11 No.4
The recessed gate IGBT has a lower on-state voltage drop compared with the DMOS IGBT, because there is no JFET resistance. But because of the electric field concentration in the corner of the gate edge, the breakdown voltage decreases. This paper is about the new structure to effectively improve the Vce(sat) voltage without breakdown voltage drop in 1700V NPT type recessed gate IGBT with p floating shielding layer. For the fabrication of the recessed gate IGBT with p floating shielding layer, it is necessary to perform the only one implant step for the shielding layer. Analysis on the Breakdown voltage shows the improved values compared to the conventional recessed gate IGBT structures. The result shows the improvement on Breakdown voltage without worsening other characteristics of the device. The electrical characteristics were studied by MEDICI simulation results.
유승우,김인걸,Yoo, Seung-Woo,Kim, In-Gul 한국항공운항학회 2015 한국항공운항학회지 Vol.23 No.2
As the issuance of type certificate and production certificate for KC-100 Naraon, Korea is ranked as the State of Design and the State of Manufacture for civil aircraft specified in the Convention on International Civil Aviation. It means that another responsibilities are imposed and new frameworks are required for the airworthiness management including the continuing airworthiness. So far the minimum airworthiness management system was sufficient as the State of Registry for the aircraft operations and safety management. However, we need to establish and maintain the airworthiness management system for the effective certification and oversight of our air operators and approval holders. This paper introduces the new obligations under the Convention on International Civil Aviation, reviews the current aviation regulations and procedures and presents the strategy for the establishment of the regulatory system to ensure the airworthiness of aircraft.
Endothelial arginase II and atherosclerosis
유승우,Dan E. Berkowitz,임현교 대한마취통증의학회 2011 Korean Journal of Anesthesiology Vol.61 No.1
Atherosclerotic vascular disease is the leading cause of morbidity and mortality in developed countries. While it is a complex condition resulting from numerous genetic and environmental factors, it is well recognized that oxidized low-density lipoprotein produces pro-atherogenic effects in endothelial cells (ECs) by inducing the expression of adhesion molecules, stimulating EC apoptosis, inducing superoxide anion formation and impairing protective endothelial nitric oxide (NO) formation. Emerging evidence suggests that the enzyme arginase reciprocally regulates NO synthase and NO production by competing for the common substrate L-arginine. As oxidized LDL (OxLDL)results in arginase activation/upregulation, it appears to be an important contributor to endothelial dysfunction by a mechanism that involves substrate limitation for endothelial NO synthase (eNOS) and NO synthesis. Additionally,arginase enhances production of reactive oxygen species by eNOS. Arginase inhibition in hypercholesterolemic (ApoE^(-/-) mice or arginase II deletion (ArgII^(-/-) mice restores endothelial vasorelaxant function, reduces vascular stiffness and markedly reduces atherosclerotic plaque burden. Furthermore, arginase activation contributes to vascular changes including polyamine-dependent vascular smooth muscle cell proliferation and collagen synthesis. Collectively, arginase may play a key role in the prevention and treatment of atherosclerotic vascular disease.
유승우,정진평,이백준,Yoo, Seung-woo,Jung, Jinpyong,Yi, Baeck-Jun 항공우주시스템공학회 2013 항공우주시스템공학회지 Vol.7 No.2
Safety requirements for aircraft and system functions include minimum performance constraints for both availability and integrity of the function. These safety requirements should be determined by conducting a safety assessment. The depths and contents of aircraft system safety assessment vary depending on factors such as the complexity of the system, how critical the system is to flight safety, what volume of experience is available on the type of system and the novelty and complexity of the technologies being used. Requirements that are defined to prevent failure conditions or to provide safety related functions should be uniquely identified and traceable through the levels of development. This will ensure visibility of the safety requirements at the software and electronic hardware design level. This paper has prepared to study on promoting the efficiency of establishing hierarchical safety requirements from aircraft level function to item level through system safety processes.
Galactosemia: A Korean Patient and Literature Review
유승우,강미현,이용욱,장미영,김숙자,Yu, Seung Woo,Gang, Mi Hyeon,Lee, Yong Wook,Chang, Mea Young,Levy, Harvey L.,Kim, Sook Za The Korea Society of Inherited Metabolic Disease 2020 대한유전성대사질환학회지 Vol.20 No.1
고전적 갈락토스 혈증은 한국에서 드물게 발생하는 유전 대사 질환이다. 또한 한국인의 돌연변이 스펙트럼은 코카시안과 비코카시안의 돌연변이 스펙트럼이 다르다. 한국에서 고전적 갈락토스 혈증은 임상적으로 서방국가와 유사하지만 분자적 연구에 따르면 백인, 아프리카인, 미국인, 일본인 및 한국인에게 고유한 돌연변이가 나타났다. 고전적인 갈락토스 혈증은 신생아 스크리닝 검사로 조기 발견하여 식이요법을 할 경우 대사질환으로 인한 합병증이 예방될 수 있다고 생각되어 왔다. 한국의 고전적 갈락토스 혈증의 가장 최근의 사례에서 신생아 시기에 임상 증상이 시작되었다. 식이 치료를 통하여 합병증이 교정되어 정상화 되었다. 추가로 저자들은 25명의 고전적 갈락토스 혈증을 가진 돌연변이의 특징을 리뷰했다. Classic galactosemia is a rare genetic disorder in Korea and the mutation spectrum in Koreans differs from that of Caucasians and non-Caucasian Americans. Classic galactosemia is considered a metabolic complication that is preventable by early detection via newborn screening and dietary treatment. In this most recent case of Korean galactosemia, the patient showed early initiation of clinical symptoms, which manifested during the neonatal period. The patient achieved normalization via diet management to correct metabolic complications. In addition, we assessed the characteristics of mutations in 25 Korean galactosemia cases via a literature review of studies associated with classic galactosemia.