http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
한창수(Changsoo Han),윤덕원(Deok won Yun),최현석(Hyeunseok Choi),홍원표(Wonpyo Hong),강은구(Eungoo Kang),최헌종(Hunjong Choi) 대한기계학회 2005 대한기계학회 춘추학술대회 Vol.2005 No.5
Recently PZT is used in ultra precision mechanism field. PZT itself has a small driving range although it has a high resolution. Many methods, such as inchworm, impact driving, inertial sliding method, etc., have been applied for moving range expansion. In this study, a new actuating mechanism for rotational motion with two driving PZT is proposed. The Fixed-Fixed beam support is applied for compensation of the difference in driving force between expansion and contraction of PZT. The behavior and design parameters of the proposed mechanism are analyzed for improving performance.
Enhancement of the Hall Mobility in Hydrogen-ion-irradiated ZnO Films
Changsoo Yeo,정권범,박진성,Jong Han Song 한국물리학회 2012 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.60 No.3
RF-sputtered ZnO films were irradiated with hydrogen ions by using an ion accelerator at 110 keV. The physical and the electrical characteristics of the irradiated ZnO films were studied as functions of the hydrogen-ion irradiation dose. The Hall measurement indicated that the carrier concentration had small changes regardless of irradiated hydrogen amount, but the mobility was dramatically enhanced after irradiation of 10<sup>15</sup> atoms/cm<sup>2</sup>. Even when the irradiated hydrogen dose was increased, the crystalline structure had no transformation and the composition was preserved. On the other hand, the electronic structure, measured by using X-ray absorption spectroscopy, exhibited a modification of the molecular orbital structure in the ZnO films irradiated at doses above 10<sup>15</sup> atoms/cm<sup>2</sup>. These distortions of the molecular orbital in the conduction band could lead to a mobility enhancement without a structural transformation.
Kim, Changsoo,Kim, Kyeongsu,Kim, Jeongnam,Ahmed, Usama,Han, Chonghun Elsevier 2018 INTERNATIONAL JOURNAL OF GREENHOUSE GAS CONTROL Vol.73 No.-
<P><B>Abstract</B></P> <P>In applying Carbon Capture and Storage (CCS) technology, pipelines are an economic choice for transporting CO<SUB>2</SUB>. However, it is difficult to plan the pipeline network in detail since various factors, such as mountain regions and high population density increase the cost of pipeline installation. Also, uncertainty of the reservoir capacity and national policies is important factors in practical pipeline deployment, especially in critical conditions mentioned above.</P> <P>In this study, the development of an optimal CCS pipeline network in critical conditions, and the effect of practical design conditions on the network, are studied using mixed-integer nonlinear programming (MINLP) modeling and optimization. South Korea is selected as a case study and optimal CCS networks are obtained according to four scenarios developed with regard to reservoir capacity and policy options. A rigorous cost model was developed, and subdivided penalty factors were applied to consider the drastic change in geographical conditions. The four scenarios were evaluated and the effect of the considered factors on the timely development of the CCS network was analyzed.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Framework for CCS network design in critical conditions is proposed. </LI> <LI> Effect of reservoir uncertainty and CCS policy options is analyzed. </LI> <LI> Policy options affect the network design more than reservoir uncertainty. </LI> </UL> </P>
지역축제의 파트너십이 축제거버넌스와 축제운영성과에 미치는 영향
한윤정 ( Yunjeong Han ),하정우 ( Jungwoo Ha ),김창수 ( Changsoo Kim ) 관광경영학회 2020 관광경영연구 Vol.98 No.-
Local festivals, which are used as a means of creating regional brand values and various added value based on them, are required to form an cooperation system based on partnerships between interest groups according to the characteristics of local festivals in which various interest groups participate. Accordingly, the purpose of this study is to consider the importance of festival partnership and festival governance by identifying the influential relationship of partnership of local festival on festival operational performance in festival governance and organizational performance aspect. In order to achieve the purpose of study, this study conducted a literature survey and empirical analysis. According to the result, partner cooperation among the factors of festival partnership and cooperation among the factors of festival governance have the greatest influence on festival operational performance. Therefore, it implies that cooperation between interest groups participating in local festivals contributes to the improvement of festival operational performance. This study is considered to be useful for improving organization of local festival and festival operational performance.
A Study on the Dynamic Analysis and Control Algorithm for a Motor Driven Power Steering System
Yun, Seokchan,Han, Changsoo,Wuh, Durkhyun The Korean Society of Mechanical Engineers 2002 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.16 No.2
The power steering system for vehicles is becoming essential for supporting the steering efforts of the drivers, especially for the parking lot maneuver Although hydraulic power steering has been widely used for years, its efficiency is not high enough. The problems associated with a hydraulic howe. steering system can be solved by a motor driven power steering (MDPS) system. In this study, a dynamic model and a control algorithm for the ball screw type of MDPS system have been derived and analyzed by using the method of discrete modeling technology. To improve steering feel and power steering characteristics, two derivative gains are added to the conventional power boosting control algorithm. Through simulations, the effects of the control gain on the steering angle gain were verified in the frequency domain. The steering returnability and steering torque phase lag in on-center handling test were also evaluated in the time domain.
고분자 전해질 연료전지(PEMFC)에서 부하변화율과 당량비가 과도응답특성에 미치는 영향
한상석(Sangseok Han),이필형(Pilhyong Lee),이재영(Jaeyoung Lee),박창수(Changsoo Park),황상순(Sangsoon Hwang) 한국자동차공학회 2008 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
Fully three dimensional transient simulation was performed numerically in order to analyze the dynamic response of 20㎠ proton exchange fuel cell with triple serpenrtine. The effects of stoichiometric number and rate of change the load on the overshoot behavior by the variable voltage change from 0.7V to 0.5V. The overshoot in current is generally observed when voltage is suddenly changed. And the peak of overshoot in current is increased when the stoichiometric number at cathode channel is increased with a fixed anode stoichiometic number. This seems to be associated with the fact that oxygen concentration in cathode makes dominant effect on reducing the cathode overpotential.