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Negligible hysteresis of molybdenum disulfide field-effect transistors through thermal annealing
노정균,이종호,진성훈,이창희 한국정보디스플레이학회 2016 Journal of information display Vol.17 No.3
Large hysteresis behaviors on molybdenum disulfide (MoS2) field-effect transistors (FETs) without passivation have been typically observed, which can be one of the obstacles to understanding the intrinsic properties of MoS2 layers. Reported herein is the fact that the negligible hysteresis gap of MoS2 can be achieved through thermal annealing without any further passivation layer. The hysteresis gap of the MoS2 FETs with thermal annealing was reduced to 0.08 V, and the device showed good field-effect mobility (23.3 cm2/V s) and a high on-to-off ratio (∼107). The hysteresis-free MoS2 FETs were systematically investigated by analyzing both the contact property and the bias stability. Furthermore, low contact resistance (6.21cm) and excellent bias stability with a 1.29×108 sec relaxation time were obtained.
노정균,류기하,이영수,조영채 大韓産業醫學會 1994 대한직업환경의학회지 Vol.6 No.2
산업체 근로자의 수면실태를 조사하고자 1993년 3월에 한 고무제품 제조업 근로자 479명을 대상으로 수면양상에 대한 설문조사를 실시한 결과는 다음과 같다. 1. 전체 조사대상자의 수면장애 유병율은 32.8%였으며, 수면장애의 유형별로는 취면곤란 11.9%, 수면유지곤란6.1%, 조조각성이 6.9%였다. 2. 연령군별 수면유지곤란은 20대가 가장 낮았고 30대가 가장 높았으며, 취침전 진정제 또는 알코올을 이용한 군의 수면장애가 비사용군에 비해 현저히 높게 나타났다. 3. 직업이나 가정에 대해 만족하는 군일수록 수면장애가 불만족군에 비해 낮았으며, 낮잠을 자는 군, 신체적 통증이 없는 군일수록 적게 나타났다. 4. 수면장애에 대한 회귀분석결과 통계적 유의성을 보인 변수는 낮잠여부, 신체적 통증여부 및 근무기간이었다. This study was conducted to investigate sleep qualitys of manufacturing workers. The data were collected from the 479 manufacturing factory workers who were most 3 shift workers. The results obtained were as follows. The prevalence rate of sleep disorder was 32.8%, rate of difficulty in intiating sleep was 11.9%, that of difficulty in maintaining sleep was 6.1%, and that of early morning awakening was 6.9%. Disorders of difficulty in maintaining sleep was low in the age group of twenties and high in thirties. The group of sedative or alcohol use before sleep induction showed high prevalence rate of sleep disorder. The group of satisfying for job or family had the lower rate of sleep disorder than the unsatisfying group. The rate of sleep disorder were low in the group of day sleeping, no physical pain. The variables such as day sleep, physical pain and job tenure showed statistical significance in the logistic regression of sleep disorder.
김종주,정용균,노정균 大韓神經精神醫學會 1995 신경정신의학 Vol.34 No.6
In this preliminary study, the authors investigated the influence of the Korean modern historical events on the psychodynamics of psychiatric patients. The authors attempted to clarify the implication of the Korean modern historical events on the manifestation of psychopathology, and to lay stress on the significance of these events. This study included 64 cases which were presented at the psychodyanmic case conference from March 1992 to Februry 1994 at the department of neuropsychiatry, Inchon Christian Hospital. The results were as follows : 1) Among the the 64 patients, the psychodynamics of 23 cases(35.9%) seem to be more influenced by the Korean modern historical events. 2) Among the variable demographic data, the patients influenced by historical events had the oppotunities of significantly higher educational levels than the ones not influenced. 3) In the patients who were influenced by historical events, there were more females than the ones not influenced, higher socioeconomic state and had more mood disorders. But the statistically significant difference was not observed. 4) As the psychosocial stress, early grandparent loss, unwilling marriage, occupation and socioeconomic problems had more significant influences on the patients influenced by historical events than the ones not influenced. 5) In the patients influenced by historical events, the diagnosis and psychocial stress factors were not significantly different among the three critical psychohistorical periods. But more patients were influenced by psychosocial stress due to the major historical events of the phaseⅡ, the period of Korean revolution and Korean War.
SHS에 의해 Coating처리한 Ni-Al계 금속간화합물의 미끄럼마모특성
이한영,노정균,김근영,池永明 한국트라이볼로지학회 2003 한국트라이볼로지학회 학술대회 Vol.36 No.-
Although intermetallic compounds have been known as a new functional material. these materials are rarely applied in the field. Brittle nature of these intermetallic compounds prevented from practical application. However. these materials have a great potential as surface modification material. Indeed, it is known the intermetallic compounds can be coated on the metal surface by the self-propagating high temperature synthesis reaction. In this study, Ni-Al based intermetallic compounds are coated on a ductile cast iron at several reaction temperatures by the SHS. Sliding wear tests are conducted to verify the sliding wear properties and to investigate the effects of the reaction temperature. As a result, it is found that microstructure of coating layer vary significantly with the reaction temperature. However. their wear properties are influenced just in the range of low sliding speed by the reaction temperature. It is clear that the wear resistance of Ni - Al based intermetallic compound coating layers are effective the range of high sliding speed. Pitting damages are observed from the worn surface.
사범대학 해석학 전공 교재에서 나타나는 지수함수 미분법의 정당화 방식에 관한 연구
류건,노정원,윤상균 대한수학교육학회 2022 학교수학 Vol.24 No.3
The purpose of this paper is to explore how the mathematical content knowledge on the derivative of the exponential function is demonstrated in analysis courses, compared to the school mathematics where is introduced without rigorous justification. We analyzed structures of justifications of in analysis textbooks used in department of mathematics education at college of education in South Korea, and compared the structures with learning trajectories in school mathematics. As a result, there were four major types of the justifications and one of them fills the gap in the learning trajectories in the high school calculus textbooks. This result suggests the necessity of understanding mathematics content knowledge for pre-service teacher education in connection with school mathematics. 본 연구의 목적은 학교수학 수준에서 엄밀한 정당화 과정이 암묵적으로 생략된 채 다루어지는 지수함수 미분법 과 관련된 수학 내용 지식이 대학 수준의 해석학 강좌에서 어떻게 보완되는지에 관해 탐색하는 것이다. 이를 위해 사범대학 수학교육과에 개설된 해석학 강좌에서 사용되는 교재들의 해당 내용에 대한 정당화 방식을 구조화하고 이를 학교수학에서의 학습 경로와 관련하여 분석하였다. 연구 결과 해석학 전공 교재에서 지수함수 의 미분법의 정당화가 다루어지는 방식은 크게 네 가지 유형으로 나타났으며, 그 중 고등학교 미적분 교과서에서의 학습 경로 상의 공백을 보완하는 유형은 한 가지로 나타났다. 본 연구의 결과는 예비 수학교사 교육에서 다루어지는 수학 내용 지식을 학교수학과 관련하여 살펴볼 필요성을 보여준다.