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An, YoungHwa,Lee, Jeongwon,Jo, JongGab,Jung, Bong-Ki,Lee, HyunYeong,Chung, Kyoung-Jae,Na, Yong-Su,Hahm, T.S.,Hwang, Y.S. IOP 2017 Nuclear fusion. Fusion nucléaire. &n.Illiga Vol.57 No.1
<P>An efficient and robust ECH (electron cyclotron heating)-assisted plasma start-up scheme with a low loop voltage and low volt-second consumption utilizing the trapped particle configuration (TPC) has been developed in the versatile experiment spherical torus (VEST). The TPC is a mirror-like magnetic field configuration providing a vertical magnetic field in the same direction as the equilibrium field. It significantly enhances ECH pre-ionization with enhanced particle confinement due to its mirror effect, and intrinsically provides an equilibrium field with a stable decay index enabling prompt plasma current initiation. Consequently, the formation of TPC before the onset of the loop voltage allows the plasma to start up with a lower loop voltage and lower volt-second consumption as well as a wider operation range in terms of ECH pre-ionization power and H<SUB>2</SUB> filling pressure. The TPC can improve the widely-used field null configuration significantly for more efficient start-up when ECH pre-ionization is used. This can then be utilized in superconducting tokamaks requiring a low loop voltage start-up, such as ITER, or in spherical tori with limited volt-seconds. The TPC can be particularly useful in superconducting tokamaks with a limited current slew-rate of superconducting PF coils, as it can save volt-second consumption before plasma current initiation by providing prompt initiation with an intrinsic stable equilibrium field.</P>
다중수원 용수공급시스템을 위한 동적 시뮬레이션 모형의 개발
김영화 ( Younghwa Kim ),박수완 ( Suwan Park ),한국헌 ( Kukheon Han ),박현기 ( Hyungi Park ),조재용 ( Jaeyong Cho ),남호성 ( Hosung Nam ),정소연 ( So-yeon Jung ) 한국농공학회 2015 한국농공학회 학술대회초록집 Vol.2015 No.-
Associated with energy supply and demand issues it has been emphasized on energy use efficiency and economic feasibility in the development and operation of water supply systems. Efficiency of these water systems are closely related to the location and nature of the water resources. The water supply system using the long distant water resource from water user has a structural limitation of high energy loss in the process of supply and pumping. The water supply system using a nearby water resource can reduce the loss of water supply and energy costs, which lead to reduction of operating costs. However, the water resources located in the vicinity of water user have to secure many sources in the regions because they have small capacity of water supply generally. In this study the dynamic simulation model using System Dynamics (SD) has been developed to apply to the operational management of the water supply system utilizing multiple water sources. The scope of the modeling is from the intake source to the reservoir, not including water distribution network model after reservoir. Dynamic simulation models can simulate water level of the reservoir and pumping costs according to the basic flow and the pumping operation rules in reservoirs. Simulation factors include change of the reservoir volume and power price according to pumping operation rules in the reservoir. Development model is the virtual prototype model of multiple water sources of water supply systems and can be extended, even if the system is more complex. By applying this model to operation and management in the multiple water supply system, it is capable of pre-simulation, which enable the cost-effective operations management.
Plasma start-up design and first plasma experiment in VEST
An, YoungHwa,Lee, Jeongwon,Lee, HyunYeong,Jo, JongGab,Jung, Bong-Ki,Chung, Kyoung-Jae,Kim, Young-Gi,Jo, Jungmin,Yang, Jeong-hun,Na, Yong-Su,Hahm, T.S.,Hwang, Y.S. Elsevier 2015 Fusion engineering and design Vol.96 No.-
<P><B>Abstract</B></P> <P>First plasma start-up experiment in Versatile Experiment Spherical Torus (VEST) has been successfully carried out with conventional start-up scheme using a central solenoid. A start-up design code has been developed for the development of start-up scenarios in VEST, which can predict evolutions of vacuum field structure and plasma current with given operation parameters from the PF coil power supply circuit considering the eddy currents. Start-up scenarios are successfully developed with the code, generating field null region in the inboard side at the onset of loop voltage in order to maximize the connection length, and then providing the required poloidal magnetic field for stable equilibrium as the plasma current evolves. Hydrogen is used as a working gas and the toroidal field of 0.1T with 0.2s flat-top is applied on magnetic axis during the discharge. With the assist of ECH (Electron Cyclotron Heating) pre-ionization (6kW, 2.45GHz), a plasma current of ∼70kA has been generated with the pulse duration of ∼10ms. The elongation and edge safety factor are estimated to be 1.6 and 3.7 respectively.</P> <P><B>Highlights</B></P> <P> <UL> <LI> First plasma start-up experiment in VEST has been successfully carried out. </LI> <LI> A start-up design code is developed to generate start-up scenarios in predictive manner. </LI> <LI> Start-up scenarios are developed with the code and confirmed experimentally in VEST. </LI> <LI> Full tokamak equilibria (<I>I</I> <SUB> <I>p</I> </SUB> =70kA, <I>κ</I> =1.6 and <I>q</I> <SUB>edge</SUB> =3.7) are achieved from the scenario. </LI> </UL> </P>
배정호(Jung Ho Bae),김동연(Dongyeon Kim),박수재(Soo Jae Park),박현성(Hyunseong Park),김성호(Sungho Kim),성영화(Younghwa Sung) 한국정보과학회 2021 정보과학회 컴퓨팅의 실제 논문지 Vol.27 No.1
본 논문에서는 블록체인 기반의 다중 드론 관리 시스템을 위한 관련 어플리케이션을 구현하여 블록체인 기술을 적용하고 성능을 분석하였다. 승인형 블록체인인 하이퍼레저 패브릭을 구현 플랫폼으로 선정하였고, 드론 임베디드 보드 상에서 체인코드들을 실행하여 관련 변수(CPU수, 체인코드 종류 등)에 따른 성능(처리속도, 소모 전력, 확장성 등)을 시험하였다. 현재 노드(5개) 수준에서 구현된 어플리케이션은 소모전력 및 초당 GPS 업데이트 속도 측면에서 다중 드론의 위치를 관리하는 데 있어 적절한 것으로 보인다. 향후 실제 운용 드론에 블록체인 어플리케이션을 탑재한 후 블록체인 네트워크의 변수들을 최적화하여 적용하고 성능을 검증할 예정이다. In this paper, a blockchain was applied and analyzed with multi drone management system application which is implemented by ourselves. To do this, Hyperledger Fabric was selected as the implementation platform. Performance (transactions per second, power consumption, and scalability) according to certain variables (number of CPU clusters, chaincodes, etc.) was tested by executing chaincodes on a drone-embedded board. We used five nodes and verified that our application was appropriate for managing the positions of the multi-drone system in terms of power consumption and the GPS update rate. In future work, we plan to apply the implemented application with optimized variables to practical drones and test the performance.
김수정(Su Jung Kim),차영화(YoungHwa Cha),최샛별(SetByol Choi) 한국사회학회 2020 韓國社會學 Vol.54 No.1
본 연구는 청소년들이 어떠한 인지적 · 감정적 과정을 거쳐 꿈의 경계를 설정하는지, 그리고 계급별로 다르게 경계 지워진 꿈이 그들에게 어떤 의미를 갖고 또 영향을 미치는지 검토해 보고자 하였다. 이를 위해 ‘2017 청소년종합실태조사’ 자료에 대해 중다대응분석을 실시하여 계급별 청소년 ‘꿈의 지형’을 확인하고, 남녀 청소년 26명을 대상으로 심층면접을 수행하여 꿈의 계급화 현상이면에 존재하는 구체적 메커니즘을 살펴보았다. 연구의 결과 각 계급별 청소년들은 친구들과 유사한 꿈을 공유하며 선택적 친화의 과정을 거치는 한편, 나와 다른 꿈을 꾸는 또래들을 ‘구별짓고’ 있었다. 청소년들은 동류계급 내의 중요한 타자들과의 상호작용을 통해 본인에게 ‘적합한 꿈’을 설정하는데, 상층계급 청소년들은 꿈을 상향조정 하는 반면, 중층계급과 하층계급 청소년들은 본인의 가정환경과 주변의 반응을 토대로 꿈의 크기를 자발적으로 축소한다. 이는 청소년들이 사회 내에 존재하는 위아래 질서와 그 질서 속 자신의 ‘자리’에 대한 감각을 확보해 가는 과정이라 할 수 있으며, 현실화 여부를 떠나 청소년들에게 또래가 꾸는 꿈이 단순한 희망사항이 아니며 현재 그가 자리하고 있는 위치와 미래의 그가 점하게 될 위치를 알려주는 ‘지위표식’으로 기능함을 말해준다 할 수 있다. This study explores the cognitive and emotional processes adolescents undergo when setting boundaries for their dreams, and what kind of meanings and influences do class-stratified dreams have for adolescents. Using the 2017 National General Survey on Korean Youth, we conducted a multiple correspondence analysis (MCA) to identify the “Dream topography” of Korean adolescents based on social class, as well as 26 in-depth interviews of male and female adolescents to look at specific mechanisms that exist behind the stratified dreams of adolescents. Results indicate that adolescents from the same class share similar dreams and go through a process of selective socialization, while “distinguishing” themselves from those who have different dreams. Adolescents dream a dream that “suits them” by interacting with significant others within the same class - while upper class adolescents aim higher, those in the middle and lower class voluntarily adjust their dreams to be modest based on their family background and the opinions of their peers. This can be seen as a process through which adolescents gain a sense of positions that they fit into, within a stratified society; and rather than simply wishful thinking, the dreams that one’s peers hold may function as a “status marker” of the social position one holds now and will in the future, regardless of whether the dreams come true or not.