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        • KCI등재

          초 저 에너지 이온주입으로 고 조사량 B 이온 주입된 실리콘의 Deactivation 현상

          유승한,노재상,Yoo,,Seung-Han,Ro,,Jae-Sang 한국재료학회 2003 한국재료학회지 Vol.13 No.6

          Shallow $p^{+}$ n junction was formed using a ULE(ultra low energy) implanter. Deactivation phenomena were investigated for the shallow source/drain junction based on measurements of post-annealing time and temperature following the rapid thermal annealing(RTA) treatments. We found that deactivation kinetics has two regimes such that the amount of deactivation increases exponentially with annealing temperature up to $850^{\circ}C$ and that it decreases linearly with the annealing temperature beyond that temperature. We believe that the first regime is kinetically limited while the second one is thermodynamically limited. We also observed "transient enhanced deactivation", an anomalous increase in sheet resistance during the early stage of annealing at temperatures higher than X$/^{\circ}C$. Activation energy for transient enhanced deactivation was measured to be 1.75-1.87 eV range, while that for normal deactivation was found to be between 3.49-3.69 eV.

        • KCI등재SCOPUS

          Recurrent-neural-network-based identification of a cascade hydraulic actuator for closed-loop automotive power transmission control

          유승한,Jin-Oh,Hahn 대한기계학회 2012 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.26 No.5

          "By virtue of its ease of operation compared with its conventional manual counterpart, automatic transmissions are commonly used as automotive power transmission control system in today's passenger cars. In accordance with this trend, research efforts on closed-loop automatic transmission controls have been extensively carried out to improve ride quality and fuel economy. State-of-the-art power transmission control algorithms may have limitations in performance because they rely on the steady-state characteristics of the hydraulic actuator rather than fully exploit its dynamic characteristics. Since the ultimate viability of closed-loop power transmission control is dominated by precise pressure control at the level of hydraulic actuator, closed-loop control can potentially attain superior efficacy in case the hydraulic actuator can be easily incorporated into model-based observer/controller design. In this paper, we propose to use a recurrent neural network (RNN) to establish a nonlinear empirical model of a cascade hydraulic actuator in a passenger car automatic transmission, which has potential to be easily incorporated in designing observers and controllers. Experimental analysis is performed to grasp key system characteristics, based on which a nonlinear system identification procedure is carried out. Extensive experimental validation of the established model suggests that it has superb one-step-ahead prediction capability over appropriate frequency range, making it an attractive approach for model-based observer/controller design applications in automotive systems."

        • KCI등재

          연소전 조건에서 탄산칼륨계 흡수제의 이산화탄소 흡수특성

          유승한,오명석,차왕석 한국산학기술학회 2011 한국산학기술학회논문지 Vol.12 No.2

          The absorption capacity and initial absorption rate of CO₂into aqueous K₂CO₃solutions were measured by using VLE(Vapor-Liquid-Equilibrium) equipment in the pre-combustion condition. Absorption experiments were conducted within the temperature range of 40~80℃ while increasing the CO₂pressure from 0 to 50bar. The effect of K₂CO₃concentration was investigated by varying in the range of 5~20%. As a results, the absorption capacity and initial absorption rate were increased with increasing K₂CO₃concentration in the absorbents. Also, the initial absorption rate was highest at 40℃. Further more, we have studied the effect of adding piperazine and homopiperazine to K₂CO₃solutions. The results showed that absorption capacity of CO₂was somewhat increased by adding piperazine. 기액 흡수평형(VLE)장치를 사용하여 연소전 조건에서 흡수용액인 K₂CO₃의 이산화탄소 흡수능 및 초기흡수속도를 측정하였다. 흡수실험은 온도 40~80℃, 이산화탄소 압력 0~50기압 범위에서 수행되었으며, 또한 흡수용액 중 K₂CO₃농도에 따른 흡수능 변화도 조사하였으며 이때 농도변화는 5~20%이었다. 실험결과, 흡수용액 중 K₂CO₃농도가 증가할수록 이산화탄소 흡수능과 초기흡수속도는 증가하였으며, 반응온도에 따른 초기흡수속도는 40℃에서 가장 높았다. K₂CO₃흡수용액의 흡수능을 증진시키기 위해 Piperazine과 homopiperazine을 각각 첨가하여 흡수 실험한 결과 Piperazine을 첨가한 경우가 이산화탄소 흡수능을 다소 증진시킴을 알 수 있었다.

        • KCI등재

          전자정부 정보보호관리체계(G-ISMS)를 활용한 공공기관 정보보호 거버넌스 수립방안

          유승한,정대령,정회경,Ryu,,Seung-Han,Jeong,,Dae-Ryeong,Jung,,Hoe-Kyung 한국정보통신학회 2013 한국정보통신학회논문지 Vol.17 No.4

          공공기관은 정보보호를 강화하기 위하여 정보보호 거버넌스 체제를 도입하고 있다. 공공기관은 정보보호 거버넌스 체계의 중요성을 인식하고, 정보보호 거버넌스의 확립을 위해서 정책 수립 및 제도 확립에 노력을 기울이고 있다. 이에, 본 논문에서는 공공기관의 정보보호 거버넌스 수립에 기초가 되는 방안을 탐색하기 위하여 정보보호 거버넌스에 대한 필요성과 정보보호 거버넌스 모델에 대해 연구하고 공공기관에 정보보호 거버넌스 수립을 위한 정부정책 및 사례를 연구하여 정책 방향을 제시한다. In order to strengthen the protection of information, public institutions have introduced information security governance system. Public institutions recognizes the importance of information security governance system, and have striven to establish information security governance by establishing institutions and making policies. In this paper, in order to investigate ways that will be the basis for the establishment of information security governance in public institutions, we studied the necessity and model of information security governance. Also, by studying the government policies and cases, we proposed the direction of the policy.

        • KCI등재후보

          Addition of Resection of Temporal Muscle and Fascia in Decompressive Craniectomy in the Treatment of Traumatic Brain Injury

          유승한,김병철,최재영,이재일,조원호,최혁진 대한신경손상학회 2016 Korean Journal of Neurotrauma Vol.12 No.2

          Objective: Decompressive craniectomy (DC) is a widely used surgical procedure for control of severely increased intracranial pressure in various conditions. The goal of this study is to evaluate the effectiveness of the addition of resection of temporalis muscle and fascia in DC particularly in the treatment of traumatic brain injury. Methods: Twenty patients underwent temporalis muscle and fascia resection in addition to conventional DC and duroplasty due to massive brain swelling in a single tertiary hospital from 2013 to 2015 were enrolled. Twenty other patients who received the standard techniques by other neurosurgeons in the same period were gathered for the control group. Postoperative computed tomography (CT) as well as functional outcome in both groups were analyzed retrospectively. Results: CT volumetry showed a significant increase of 85.19 mL (p<0.001) of extracranial herniation volume in the research group compared with the control group. Using modified Rankin Scale and Glasgow Outcome Scale, there was no statistically significant difference in functional outcome between the two groups. Conclusion: Although preliminary, the procedure appears to show a meaningful increase in extracranial herniation volume with minimal masticatory and cosmetic impairment.

        • KCI등재후보

          수월성 교육을 위한 초등학교 로봇프로그래밍 교육과정 개발과 적용

          유승한,문외식 한국정보교육학회 2007 정보교육학회논문지 Vol.11 No.1

          본 연구는 로봇을 활용한 프로그래밍학습이 초등학생 및 초등영재들에게 창의력 향상에 도움을 주는 과학적인 학습도구라 판단되어 교육과정을 개발하였다. 이를 기초로 교재를 작성하고 현장에 직접 적용하여 그 결과를 분석하였다. 교육과정과 교재의 내용은 다양한 문제 상황에 맞는 로봇을 직접 제작하고 프로그래밍하는 과정(모두 6단계)으로 구분하고 학습수준에 맞게 편집함으로서 초등학생들이 로봇과 프로그래밍에 흥미와 관심을 가질 수 있도록 하였다. 로봇교육을 현장에 적용한 결과 창의성교육 도구로서 긍정적인 학습도구로 평가되었다. 또한, 수월성교육을 위한 학습도구로서 몇 가지 보완해야 할 결론도 함께 얻었다. This study is aimed at developing a curriculum in relation to programming learning by using robot, for it has been judged as a scientific learning tool to help elementary school children as well as gifted children among them improve their creativity. Based on this concept, teaching aids and materials were developed, and then applied to the locale of education, and results therefrom were analyzed ccordingly. Curriculum and contents of teaching aids were classified into two processes, i.e. the assembling process of robot to fit the varied problematic situations and the programming process (all six phases), and edited so much as to entice elementary school children to get interests and attentions to robot and programming by compiling the contents to suit their level of learning. Results from the evaluation of the application of robot education curriculum to the locale for learning revealed that it was a positive teaching tool that helped children improve their creativity. Also conclusions were derived from the analysis and evaluation that several aspects should be complemented as for teaching and learning tool to achieve the objective of excellence education.

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