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Younghwan Son,Chang-Ki Baek,In-Shik Han,Han-Soo Joo,Tae-Gyu Goo,Ooksang Yoo,Wonho Choi,Hee-Hwan Ji,Hi-Deok Lee,Kim, D.M. IEEE 2009 IEEE TRANSACTIONS ON NANOTECHNOLOGY Vol.8 No.5
<P>This paper presents the depth profile of oxide trap density, extracted from the dual gate processed thermally grown oxide in NO ambient and remote plasma nitrided oxides by using multifrequency and multitemperature charge pumping technique in conjunction with the tunneling model of trapped charges. Nitrided oxide is widely used to improve the reliability of nanoscale MOSFETs because it can decrease the degradation of gate oxide due to the generation of traps therein. Based on the measurement, the optimum nitrogen concentration in such typical nitrided process is discussed in correlation with the gate oxide thickness for nanoscale CMOSFETs.</P>
Optimal Design of Body Profile for Stable Stair Climbing Via Tri-wheels
Younghwan Kim,Donghan Son,Jeongpil Shin,TaeWon Seo 한국정밀공학회 2023 International Journal of Precision Engineering and Vol.24 No.12
In this paper, we propose a mobile robot platform that is an improved form of LEVO. The LEVO uses a regular wheel and curved spoke triwheel(CSTW) system to drive flat terrain and stair climbs. However, this robot has problems when climbing stairs: it’s bottom profile collides with the stairs, resulting in huge jerk. To solve this problem, in this study, attempts to reduce the jerk value by applying a blade using a B-spline to the bottom profiles where the robot collides with the stairs. At this time, by reducing jerk, it can contribute to extending the life of the robot and improving driving stability. This study involved two steps. First, simulation was performed by adjusting the number and position of control points of the curve (B-spline). In this process, the orthogonal arrangement was applied among the optimal design techniques to finally reduce the jerk value by 92% and the driving torque needed to climb the stairs by 9.5%. At this time B-spline has one control point and the position is (300, 15). This simulation result was verified experimentally using a test bench and a prototype robot. As a result, it was confirmed that the jerk was reduced by 66.7%. Simulations and experimental verification based on them have shown that the proposed method is sufficiently effective in real environment.
손봉균(Bongkyun Son),한상욱(Sangwook Han),이병준(Byongjun Lee),권세혁,김상태(Sangtae Kim),김지영(Jiyoung Kim),문영환(Younghwan Moon) 대한전기학회 2009 대한전기학회 학술대회 논문집 Vol.2009 No.11
한전은 2009년 7월 4개의 PMU를 주요 345㎸ 변전소에 설치하였다. 이로부터 전압, 전류 정보를 실시간으로 취득하게 되면서 실시간으로 전압안정도를 감시하는 것이 가능하게 되었다. 본 논문에서는 설치된 PMU 4기 중, 전압안정도 감시에 주요한 3기의 실제데이터를 이용하여 광역 전압안정도 평가 방법 중 하나인 WAVI 알고리즘을 이행하고자 한다. 이로부터 전압안정도 감시 지수 결과를 확인하도록 한다.
Life cycle carbon dioxide emissions for fill dams
Noh, Sookack,Son, Younghwan,Park, Jaesung Elsevier 2018 Journal of cleaner production Vol.201 No.-
<P><B>Abstract</B></P> <P>The construction industry including infrastructure construction, affects the environment due to the use of a considerable amount of resources and energy. The management of the environmental effect of dams for agricultural reservoirs is especially important in South Korea because of their large scale and nationwide distribution. The objective of this study is to propose an assessment method for evaluating life cycle carbon dioxide emissions associated with fill dams and to characterize carbon dioxide emissions to use in effectively addressing the environmental concerns for infrastructures. A total of four dams were selected for the research, and the material production, use of equipment and transportation were considered as the causes of carbon dioxide emissions at the dams. The effective life cycle of a fill dam was assumed to be 100 years. The results of the research indicated that the total amount of carbon dioxide emissions were different for each dam according to their characteristics, and the results showed that the dam size is the primary cause. In addition, the carbon dioxide emissions increased as the period of use increased, and a rapid increase was indicated in 40–50 years interval of the dams’ use periods because the repair activities were concentrated in those years. Materials were the biggest contributor in the amount of total carbon dioxide emissions at all four sites and the ratio of carbon dioxide emissions caused by materials was higher than any other factors in most processes. There was little difference in the proportion of carbon dioxide emissions for each process in the total carbon dioxide emissions for the four sites. Most carbon dioxide was emitted during repair activities at the two largest dams. Activities associated with the construction process was the major source of carbon dioxide emissions at the two other dams. This difference in process carbon dioxide emissions was the result of the difference in the construction scale for the embankment elevation. The assessment method that has been proposed in this study reflects the characteristics of fill dams, and the result of estimating carbon dioxide emissions indicates that we are able to reduce carbon dioxide emissions in the life cycle of fill dams by selecting the construction materials and the repair methods with a low carbon dioxide emissions.</P> <P><B>Highlights</B></P> <P> <UL> <LI> We evaluated and characterized life cycle CO<SUB>2</SUB> emissions for fill dams. </LI> <LI> Material consumption was the major cause of CO<SUB>2</SUB> emissions in life cycle of fill dams. </LI> <LI> Most CO<SUB>2</SUB> were emitted during a construction and a maintenance stage in fill dams. </LI> <LI> Life cycle CO<SUB>2</SUB> emissions for fill dams were influenced by their scale, mainly. </LI> </UL> </P>