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이온 주입한 MOSFET에 대한 Threshold 전압의 모데링
류종선,김여환,김보우,Ryu, Jong-Seon,Kim, Yeo-Hwan,Kim, Bo-U 대한전자공학회 1985 전자공학회지 Vol.22 No.1
본 논문에서는 채널에 붕소를 이온주입하여 불균일한 도우핑 profile을 가지는 n-채럴 MOSFET의 threshold 전압에 대하여 보다 간단한 모델링을 기술하였다. 실제의 도우핑 Profile들 지수적인 Profile을 지수적인 profile로 근이시키고 Poisson방정식과 depletion approximation을 이용하여 실리콘 표면의 Potential, 최대 공핍층의 폭 그리고 threshold 전압을 구하였다. 계산한 threshold 전압이 실험치와 잘 일치한다는 사실은 이온 주입한 MOS소자들에 대하여 지수적인 도우핑 Profile로 근이시킬 수 있다는 타당성을 보여 주고 있다.
실리콘 게이트 n-well CMOS 소자의 제작, 측정 및 평가
류종선,김광수,김보우,Ryu, Jong-Seon,Kim, Gwang-Su,Kim, Bo-U 대한전자공학회 1984 전자공학회지 Vol.21 No.5
A silicon-gate n-well CMOS process with 3 $\mu$m gate length was developed and its possibility for the applications was discussed,. Threshold voltage was easily controlled by ion implantation and 3-$\mu$m gate length with 650 $\AA$ oxide shows ignorable short channel effect. Large value of Al-n+ contact resistance is one of the problems in fabrications of VLSI circuits. Transfer characteristics of CMOS inverter is fairly good and the propagation delay time per stage in ring oscillator with layout of (W/L) PMOS /(W/L) NMOS =(10/5)/(5/5) is about 3.4 nsec. catch-up occurs on substrate current of 3-5 mA in this process and critically dependent on the well doping density and nt-source to n-well space. Therefore, research, more on latch-up characteristics as a function of n-well profile and design rule, especially n+-source to n-well space, is required. 3μm 게이트 길이를 가지는 n-well CMOS 공정이 개발되었고 이의 응용 가능성을 검토하였다. Thres-hold 전압은 이온주입으로 쉽게 조절할 수 있으며, 3μm 채널 길이에서 short 채널 효과는 무시할 수 있다. Contact 저항에 있어서 Al-n+ 저항값이 커서 VLSI 소자의 제작에 장애 요인이 될 것으로 보인다. CMOS inverter의 transfer 특성은 양호하며, (W/L) /(W/L) =(10/5)/(5/5)인 89단의 ring oscillator로부터 구한 게이트당 전달 지연 시간은 3.4nsec 정도이다. 본 공정의 설계 규칙에서 n-well과 p-substrate에 수 mA의 전류가 흐를 때 latch-up이 일어나며, well 농도와 n+소오스-well간의 간격에 크게 영향을 받는다. 따라서 공정과 설계 규칙의 변화에 따른 latch-up 특성에 집중적인 연구가 필요할 것으로 사료된다.
Non-Helicobacter pylori, Non-NSAIDs 소화성궤양
류종선 ( Jong Sun Rew ) 대한내과학회 2014 대한내과학회지 Vol.86 No.6
Non-Helicobacter pylori, non-NSAID peptic ulcer disease, termed idiopathic peptic ulcer disease (IPUD), is being increasingly recognized. Current data suggest that the relative proportion of patients with IPUD among those with peptic ulcers has been increasing for the past decade in both the West and East, while the prevalence of H. pylori ulcers has decreased. Potential causative or risk factors of IPUD include cigarette smoking, genetic predisposition, psychological factors, infections other than H. pylori, non-NSAID drugs or toxins, systemic inflammatory disease, and local mucosal defects. Diagnosis is made after confident exclusion of H. pylori infection by at least two different standard tests and accurate exclusion of unrecognized or surreptitious NSAID use by careful history taking and serologic assay. IPUD is characterized by higher complication and recurrence rates than other forms of peptic ulcer disease and has become a main cause of refractory ulcer disease. Maintenance therapy using proton pump inhibitors may be required at higher doses and for longer durations than in H. pylori- or NSAID-associated peptic ulcer diseases. Well designed nationwide epidemiologic studies are required to fully elucidate this emerging condition. (Korean J Med 2014;86: 678-685)
공복혈당장애와 제 2형 당뇨병의 위험요인 - 데이터마이닝을 이용하여
류종선(Jongseon Ryu),김순덕(Soonduck Kim),박종순(Jongsoon Park),이제숙(Jesuk Lee) 한국역학회 2006 Epidemiology and Health Vol.28 No.2
Purpose: This study aimed to contribute to overall public health by examining the prevalence rates of impaired fasting blood glucose and type 2 diabetes mellitus and developing a model to predict high risk factors for impaired fasting blood glucose and type 2 diabetes mellitus. Methods: The 1998 Public Health Nutrition Survey data was used for this study. Subjects were 7,702 adult at the age of 20 or over. The frequency analysis, chisquared test was performed. A decision tree was utilized to define a model designed to predict high risk factors for impaired fasting glucose and type 2 diabetes mellitus. Results: The prevalence rates of impaired fasting blood glucose was 10.8% and prevalence rates of type 2 diabetes mellitus was 9.4%. The decision tree analysis exhibited that age was strong factors for impaired fasting blood glucose. HDL cholesterol and kind of economic activities were high risk factors for impaired fasting blood glucose and type 2 diabetes mellitus on those in 20s. BMI, total cholesterol level, marriage status, sex for impaired fasting blood glucose and type 2 diabetes mellitus on those in 30s. The total cholesterol level, drinking and waist size were identified as risk factors on those in 40s. BMI, education level and hypertension seemed to have an impact on those in 50s. The waist size, sex and income had an impact on those in 60s. Conclusions: This study underscores the need for the public health infrastructure to improve various health promotion programs for those who have risk factors for impaired fasting blood glucose and type 2 diabetes mellius. The implementation of effective nutrition, workout and anti-drinking programs will boost public health.