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A Study on Thermal Stability Improvement in Ni Germanide/p-Ge using Co interlayer for Ge MOSFETs
Geon-Ho Shin,Jeyoung Kim,Meng Li,Jeongchan Lee,Ga-Won Lee,Jungwoo Oh,Hi-Deok Lee 대한전자공학회 2017 Journal of semiconductor technology and science Vol.17 No.2
Nickel germanide (NiGe) is one of the most promising alloy materials for source/drain (S/D) of Ge MOSFETs. However, NiGe has limited thermal stability up to 450°C which is a challenge for fabrication of Ge MOSFETs. In this paper, a novel method is proposed to improve the thermal stability of NiGe using Co interlayer. As a result, we found that the thermal stability of NiGe was improved from 450°C to 570°C by using the proposed Co interlayer. Furthermore, we found that current-voltage (I-V) characteristic was improved a little by using Co/Ni/TiN structure after post-annealing. Therefore, NiGe formed by the proposed Co interlayer that is, Co/Ni/TiN structure, is a promising technology for S/D contact of Ge MOSFETs.
김태건(Kim Tae Geon),임미숙(Lim Mi Suk),이희성(Lee Hi Sung) 한국철도학회 2009 한국철도학회 학술발표대회논문집 Vol.2009 No.11월
Container which is representative transportation vessel is holding very important position in a field of railroad transportation. And container transportation using railroad is continuously increasing but efficiency is low because container car(or flat car) can not be used to transport other items. Also, in Korean railway logistics, various freight car is operating by characteristic of transportation items but due to transportation demand that has serious deviation by items, routes, and periods, operational efficiency is low and competitive power has dwindled than road transportation. This research and development, for efficiency enlargement of railroad logistics, has been performed practically to develop transportation vessel. The transportation vessel is attachable / detachable vessel which can be utilized for bulk transportation on a container car. As it enables bulk transportation and container transportation on a container car, It will contribute to improve the usefulness of freight car operation and elevate country competitive power through reducing the cost of national logistics.
A Study on Thermal Stability Improvement in Ni Germanide/p-Ge using Co interlayer for Ge MOSFETs
Shin, Geon-Ho,Kim, Jeyoung,Li, Meng,Lee, Jeongchan,Lee, Ga-Won,Oh, Jungwoo,Lee, Hi-Deok The Institute of Electronics and Information Engin 2017 Journal of semiconductor technology and science Vol.17 No.2
Nickel germanide (NiGe) is one of the most promising alloy materials for source/drain (S/D) of Ge MOSFETs. However, NiGe has limited thermal stability up to $450^{\circ}C$ which is a challenge for fabrication of Ge MOSFETs. In this paper, a novel method is proposed to improve the thermal stability of NiGe using Co interlayer. As a result, we found that the thermal stability of NiGe was improved from $450^{\circ}C$ to $570^{\circ}C$ by using the proposed Co interlayer. Furthermore, we found that current-voltage (I-V) characteristic was improved a little by using Co/Ni/TiN structure after post-annealing. Therefore, NiGe formed by the proposed Co interlayer that is, Co/Ni/TiN structure, is a promising technology for S/D contact of Ge MOSFETs.
3호선 실제선로 조건에서의 레일경좌 변화에 따른 철도차량 주행안전성 해석
김태건 ( Tae Geon Kim ),이희성 ( Hi Sung Lee ) 한국안전학회(구 한국산업안전학회) 2016 한국안전학회지 Vol.31 No.3
It is very hard to analyze the train derailment safety quantitatively at the curved section because of the diversified affect parameters including the complex interaction between wheel and rail, the train conditions such as the shape of wheel, suspension system, the track conditions such as the radius of curve, cant, transition curve, and the operation conditions, etc. Two major factors related to the running safety of railway vehicle are classified as the railway vehicle and the track condition. In this study, when the railway vehicle passing through curves of actual track condition of subway line NO.3 in seoul (Yeonsinnae↔Gupabal), the effect that has influence on running safety depending on rail inclination. The analysis result of 1/40 rail inclination condition is more favorable on running safety than other rail inclination conditions because derailment coefficient and wheel unloading ratio are the lowest.
Eun Mi Kim,Sung Hi Kim,Geon Ho Lee,김윤아 대한가정의학회 2019 Korean Journal of Family Medicine Vol.40 No.4
Background: We evaluated the effects of socioeconomic factors and psychosocial factors, both individually and combined, on all-cause mortality risk (mortality risk).Methods: We conducted an 8-year (2006–2014) longitudinal analysis of 10,247 individuals who took part in the Ko-rean Longitudinal Study of Aging, a nationwide survey of people aged 45–79 years. Socioeconomic vulnerability (SEV) was assessed with factors such as education, household income, commercial health insurance, and residen-tial area. Mental health (MH) was assessed with factors such as depression, social engagement, and life satisfaction. The covariates were age, gender, marital status, cohabiting, number of chronic diseases, and health behaviors such as regular exercise, smoking, and alcohol intake. We used a Cox proportional hazard analysis to investigate the ef-fects of SEV and MH on mortality risk and also to analyze the superimposed effects of SEV-MH on mortality risk.Results: After the controlling for the covariates, high SEV and negative MH were found to be strong predictors of all-cause mortality. The highest quartile of SEV (vs. lowest) had a 1.70 times greater mortality risk (hazard ratio [HR], 1.70; 95% confidence interval [CI], 1.24–2.33) and the highest quartile of MH (vs. lowest) had a 2.13 times greater mortality risk (HR, 2.13; 95% CI, 1.72–2.64). Being in the highest quartile for both SEV and MH (vs. lowest) increased mortality risk more than 3 times (HR, 3.11; 95% CI, 2.20–4.40).Conclusion: High SEV and negative MH were independently associated with increased mortality risk, and their su-perimposed effects were associated with an increased risk of mortality.
김태건 ( Tae Geon Kim ),엄범규 ( Beom Gyu Eom ),이희성 ( Hi Sung Lee ) 한국안전학회(구 한국산업안전학회) 2013 한국안전학회지 Vol.28 No.4
Train accidents can be directly connected to fatal accidents-collision, derailment, Fire, railway crossing accidents-resulting in tremendous human casualties. First of all, the railway derailment is not only related to most of railway accidents but also it can lead to much more catastrophic accompanying train overtured than other factors. Therefore, it is most important factor to ensure railway safety. some foreign countries have applied to the detector machines(e.g., ultrasonic detector car, sleep mode, current detector, optical sensing, optical fiber). Since it was developed in order to prevent train from being derailed. In korea, the existing track method has been used to monitor rail condition using track circuit. However, we found out it impossible for Communication Based Train Control system(CBTC), recent technology to detect rail condition using balise(data transmission devices) without no track circuit. For this reason, it is needed instantly to develop real-time monitoring system used to detect broken rails. Firstly, this paper presents domestic and international statues analysis of rail breaks technology. Secondly, the composition and the characteristics of the real-time monitoring system. Finally, the evidence that this system could assumed the location and type of broken rails was proved by the experiment of prototype and operation line tests. We concluded that this system can detect rail break section in which error span exist within±1m.