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NANOCAD Framework for Simulation of Quantum Effects in Nanoscale MOSFET Devices
Seonghoon Jin,Chan Hyeong Park,In-Young Chuug,Young June Park,Hong Shick Min 대한전자공학회 2006 Journal of semiconductor technology and science Vol.6 No.1
We introduce our in-house program, NANOCAD, for the modeling and simulation of carrier transport in nanoscale MOSFET devices including quantum-mechanical effects, which implements two kinds of modeling approaches: the top-down approach based on the macroscopic quantum correction model and the bottom-up approach based on the microscopic non-equilibrium Green’s function formalism. We briefly review these two approaches and show their applications to the nanoscale bulk MOSFET device and silicon nanowire transistor, respectively.
Seonghoon Jin,Hong Shick Min,Young June Park 한국물리학회 2004 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.44 No.1
We propose a new transport model, named the `hydrodynamic density-gradient (HDG) model', that can simulate the quantum-mechanical and the nonlocal transport effects simultaneously. The HDG model is a hydrodynamic expansion of the density-gradient model that treats the quantum effects by using a quantum correction term. The governing equation set of the HDG model includes the Poisson equation, the electron continuity equation, the quantum potential equation, and the energy balance equation. To discretize the governing equations, we apply the control volume method with nonlinear discretization schemes for the electron and the hole ux terms. To implement the HDG model, we have developed a generalized multi-dimensional device simulator called NANOCAD. We also have implemented other transport models such as the coupled Schrodinger-Poisson model, the drift-diffusion model, the density-gradient model, and the hydrodynamic model to compare them with the HDG model. We have simulated a 25-nm NMOSFET device, and the results show that our model successfully predicts the quantum-confinement effects, the lateral quantum effects, and the velocity overshoot effects in the device.
Lee, Myoung Jin,Jin, Seonghoon,Baek, Chang-Ki,Hong, Sung-Min,Park, Soo-Young,Park, Hong-Hyun,Lee, Sang-Don,Chung, Sung-Woong,Jeong, Jae-Goan,Hong, Sung-Joo,Park, Sung-Wook,Chung, In-Young,Park, Young IEEE 2007 IEEE transactions on electron devices Vol.54 No.12
<P> We have experimentally analyzed the leakage mechanism and device degradations caused by the Fowler–Nordheim (F–N) and hot carrier stresses for the recently developed dynamic random-access memory cell transistors with deeply recessed channels. We have identified the important differences in the leakage mechanism between saddle fin (S-Fin) and recess channel array transistor (RCAT). These devices have their own respective structural benefits with regard to leakage current. Therefore, we suggest guidelines with respect to the optimal device structures such that they have the advantages of both S-Fin and RCAT structures. With these guidelines, we propose a new recess-FinFET structure that can be realized by feasible manufacturing process steps. The structure has the side-gate form only in the bottom channel region. This enhances the characteristics of the threshold voltage (<TEX>$V_{\rm TH}$</TEX>), <SMALL>ON</SMALL>/<SMALL>OFF</SMALL> currents, and the retention time distributions compared with the S-Fin structure introduced recently. </P>
Hack-Lyoung Kim,Jaehoon Chung,Kyung-Jin Kim,Hyun-Jin Kim,Won-Woo Seo,Ki-Hyun Jeon,Iksung Cho,Jin Joo Park,Min-Ho Lee,Jon Suh,Sang-Yup Lim,Seonghoon Choi,Sang-Hyun Kim 대한심장학회 2022 Korean Circulation Journal Vol.52 No.2
With the recent rapid increase in obesity worldwide, metabolic syndrome (MetS) has gained significant importance. MetS is a cluster of obesity-related cardiovascular risk factors including abdominal obesity, atherogenic dyslipidemia, high blood pressure and impaired glucose tolerance. MetS is highly prevalent and strongly associated with an increased risk of developing diabetes and cardiovascular disease, putting a great burden on human society. Therefore, it is very important to reduce MetS risk, which can improve patients’ cardiovascular prognosis. The primary and most effective strategy to control each component of MetS is lifestyle change such as losing body weight, keeping regular exercise, adopting a healthy diet, quitting smoking and alcohol drinking in moderation. Many studies have shown that lifestyle modification has improved all components of MetS, and reduces the incidence of diabetes and cardiovascular disease. Here, the Korean Society of CardioMetabolic Syndrome has summarized specific and practical methods of lifestyle modification in the management of MetS in the healthcare field.
Thyroid cancer among female workers in Korea, 2007–2015
Seonghoon Kang,Jinho Song,Taehwan Koh,One Park,Jong-Tae Park,Won-Jin Lee 대한직업환경의학회 2018 대한직업환경의학회지 Vol.30 No.-
Background: Prevalence of thyroid cancer has been increasing rapidly worldwide, especially among women. There has been a debate as to whether such an increase represents consequences of over-diagnosis or a true increase. To find the occupational risk of Korean female workers in different industry sectors, we analyzed the data of Korean female workers. Methods: National Female Worker Cohort data that contain information on total female workers were used for our analysis of prevalence of thyroid cancer (C73 according to KCD-5, 6 code) derived from National Health Insurance data. By combining industrial codes from National Health Insurance Service and those from Korea Workers’ Compensation and Welfare Service, the classification of industrial codes became to consist of the total of thirty three representing both non-office (NO) and office (O) categories. Both an internal comparison among female workers within the cohort and an external comparison to compare female workers with Korean general female population were carried out. Results: Among 149,258 female workers, 2,641 cases of thyroid cancers were identified. Differences in prevalence of thyroid cancer between female workers (40.5%) and general Korean female population (32.6%) were observed; however, the differences in prevalence of thyroid cancer between NO workers and O workers were not apparent. An analysis involving workers in Financial and insurance activities sector revealed that, standardized prevalence rate (SPR) of both NO (2.96, 95% CI = 2.01.4.20) and O workers (3.68, 95% CI = 3.10.4.33) increased significantly and that an AOR (adjusted odds ratio) increased marginally (1.38, 95% CI = 0.97.1.96). Further, when stratified in respect to the duration of employment, an AOR of female workers having been employed for more than 8 years showed a significant increase (1.63, 95% CI = 1.07.2.49). Conclusions: Female workers had a higher risk of thyroid cancer than general female population but the difference between NO workers and O workers was not found to be significant in most industrial sectors. Further studies using data with information regarding specific occupational exposures are needed.
The Roles of Corporate Governance in a Firm’s Conformity to Institutional Pressures
Seonghoon Kim(김성훈),Choelsoon Park(박철순),Young-Jin Kim(김영진) 한국전략경영학회 2017 전략경영연구 Vol.20 No.3
본 연구는 한국 기업의 구조조정 활동을 분석함으로써 다음의 두 질문에 답하려 한다. 첫째, 성과 향상에 미치는 영향이 뚜렷하지 않음에도 불구하고, 1990년대 말 이후 왜 많은 한국 기업들이 구조조정을 추진하는가? 둘째, 많은 기업들이 적극적으로 구조조정을 추진함에도 불구하고, 왜 다른 기업들은 구조조정에 덜 적극적인가? 첫째 질문에 대한 답을 찾기 위해 본 연구는 제도화 이론의 관점을 적용한다. 즉, 기업의 구조조정 활동은 경제적, 법률적 환경의 변화 뿐 아니라 사회와 산업으로부터의 제도적 압력에 영향을 받는다는 것이다. 둘째 질문에 답하기 위해 본 연구는 동일한 제도적 압력 하에서도 기업이 처한 각기 다른 상황 때문에 대응이 다를 수 있음을 주장하고, 가장 중요한 상황요인으로서, 국내 뿐 아니라 여러 신흥시장에서 중요한 의미를 가지는 두 기업지배구조 요인의 영향을 살펴본다. 이는 최고경영자의 특성(전문경영자 또는 가족경영자)과 기업집단 소속여부이다. By examining corporate restructuring by Korean firms, this paper attempts to answer the following two questions: 1) despite their unsatisfactory performance consequences, why have firms actively pursued restructuring over the last decades?; and, more importantly, 2) why have some firms not followed restructuring whereas others have actively pursued it? Adopting the institutional perspective to answer the first question, this paper presents the finding that corporate restructuring is triggered, not only by the changes in economic and regulatory environments, but also by institutional pressures from the society and industry. In order to answer the second question, this paper argues that even under the same institutional pressures for restructuring, a firm’s conformity to the pressures differs by the various internal and external conditions of the firm. As such contingency factors, this paper presents the two governance mechanisms that are specific to Korea as well as to most emerging economies: 1) the origin of top managers (professional versus family) and 2) business group affiliation.