http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
The Simulation of Reactor Physics Test for the Research Reactor HANARO
Noh, Taewan Research Institute of Science and Technology HONGI 2005 Hongik Journal of Science and Technology Vol.9 No.-
The paper describes the development of a reactor power control algorithm using the program simulator for the simulation of dynamic behavior of a nuclear reactor. Before the full development of the algorithm for the commercial nuclear power plant, the Korean research reactor HANARO was chosen as a sample reactor for the simulation and for the reactor physics test. All the dynamic characteristics of HANARO were mathematically modeled into a computer program and the parameters of the plant components and the algorithm of reactor control system are adjusted to improve the transient performances as well as to satisfy the constraints imposed on the plant. Several physics parameters such as control rod worth, isothermal temperature defect, and power defec are correlated. These parameters were measured in serial order at the same core condition. The transient response of the plant shows satisfactory behavior and are well corresponding to the result of reactor physics test.
Tribological Optimization for Particulated Rough Surfaces
TaeWan Kim(김태완) 한국트라이볼로지학회 2009 한국트라이볼로지학회 학술대회 Vol.2009 No.11
지금까지 대부분의 거친 표면의 접촉해석에 사용된 표면은 Gaussian 또는 Non-Gaussian 높이 분포를 갖는 표면 들과 같이 단일 모달 거칠기 분포 표면으로 가정되어 해석이 수행되어 왔다. 그러나 마그네틱 표면이나 열처리 후의 석출된 표면 또는 연꽃잎과 같은 작은 범퍼들이 존재하는 경우의 표면은 다중 모달의 높이 분포를 갖는다. 따라서 본 연구에서는 바이모달 분포를 갖는 표면을 수적으로 생성 시켜 접촉해석을 수행하였다. 이를 위해 우선 Gaussaian 거친 표면을 생성 시키고 그 위에 랜덤으로 존재하는 구형 입자 표면을 중첩함으로써 바이모달 분포 표면을 생성시켰다. 다양한 입자의 크기 및 분포에 따른 바이모달 분포 통계 특성을 파악하였으며 접촉해석을 수행하여 마멸, 마찰에 유리한 최적을 표면을 제시하고자 하였다.
Antiferromagnetically Exchange-coupled Two Phase Magnets : Co/Co₂TiSn
Taewan Kim,Jung Keun Oh 한국자기학회 2008 Journal of Magnetics Vol.13 No.2
The objective of this paper is to review the magnetic and magneto-transport properties of Co/Co₂TiSn consisting of two metallic magnetic phases that are antiferromagnetically exchange-coupled at the phase boundary. The bulk Co/Co₂TiSn system, which has a Co₂TiSn Heusler alloy precipitates in the hexagonal Co matrix, showed an unusual coercivity change with a concurrent change in temperature, and was modeled on the basis of a wall formation caused by exchange coupling at the phase boundary. For measurements of magneto-transport properties, Co/Co₂TiSn thin films that had two-magnet phases were deposited using a magnetron sputtering system with a composite target. The magnetization process in the films is also explained on the basis of the model of wall formation at the phase boundary. Annealed Co/Co₂TiSn films showed a 0.12% GMR effect, indicating the scattering of polarized conduction electrons due to the antiparallel exchange coupling at the phase boundary. The scattering process of conduction electrons at the phase boundary was modeled with relation to the magnetization process.
New Macroscopic Ferrimagnets in the System Co-TbN
Taewan Kim,Jung Keun Oh 한국자기학회 2008 Journal of Magnetics Vol.13 No.1
This study examines a new macroscopic ferrimagnet, Co-TbN. This ferrimagnet, consisting of two metallic phases, Co and TbN, demonstrated the typical macroscopic ferrimagnet properties of a magnetic compensation point and a negative giant magnetoresistance (GMR). The Co-TbN system with 32% TbN composition showed 0.72% GMR in magnetic fields up to 8 kOe at room temperature and 9% GMR in 40 kOe at 250 K. In the Co-TbN system, GMR exhibited a different dependence on temperature from that of ordinary GMR materials whose negative magnetoresistance decreases with increasing temperature. In contrast to ordinary GMR materials whose negative magnetoresistance decreases with increasing temperature, the GMR effect in the Co-TbN system increased with increasing temperature, due to the increase of ferromagnetic alignment of the Co and TbN in the magnetic field caused by the decreased exchange coupling with increasing temperature.
A Simple Procedure of Seismic Performance Evaluation for Unreinforced Masonry Buildings in Korea
Taewan Kim 대한건축학회 2013 Architectural research Vol.15 No.3
This study was aimed at analyzing the three-step seismic performance evaluation procedure of Korea Infrastructure Safety Cooperation and proposing a new procedure suitable for unreinforced masonry buildings in Korea. For the study, it was investigated the performance evaluation results of five example URM buildings. First of all, it was found that the performance evaluation procedure for the URM buildings should be different from that for the other structural systems. As a result, a simple procedure of seismic performance evaluation was proposed, which includes elimination of elastic and inelastic push-over analysis and reduction of performance levels and evaluation steps. With the simple procedure, the URM buildings could be evaluated more easily than the other structures. It would be expected that the procedure can provide structural engineers with a simple and easy way to evaluate the seismic performance of the Korean URM buildings. Nevertheless, the procedure must be revised continuously by reflecting new research products for the URM buildings in Korea.
Taewan Kim 대한건축학회 2013 Architectural research Vol.15 No.1
The reinforced concrete shear walls are being widely used in the domestic high-rise residential complex buildings. If designed by current codes, the special boundary element is needed in almost all high-rise shear wall buildings. This is because the equation for determining the provision of the special boundary element in the current codes cannot reflect the characteristics of the domestic high-rise shear walls with high axial load ratio and high proportion of elastic displacement to total displacement. In this study, a new equation to be able to reflect the characteristics is proposed. By using the equation, the special boundary element may not be necessary in certain cases so that structural engineers can relieve the burden of installing the special boundary element in every high-rise shear wall.
Hardly Changed: Beijing-Pyongyang-Seoul Trilateral Game
( Taewan Kim ) 국방대학교 안보문제연구소 2015 The Korean Journal of Security Affairs Vol.20 No.2
The 1992 normalization of relations between the People``s Republic of China (PRC) and the Republic of Korea (ROK) was an historic watershed for the beginning of an amicable relationship between Beijing and Seoul and the drying up of the long friendship of Beijing and Pyongyang. Over the last two decades, the PRC-ROK relationship has evolved into a "strategic cooperative partnership" while the relationship between the PRC and the Democratic People``s Republic of Korea (North Korea or DPRK) has deteriorated since the third-generation power succession in 2012 and the third nuclear test in February 2013. The PRC displayed its warm hospitality toward President Park``s visit to Beijing and held the sixth bilateral summit in September 2015; the PRC, however, did not arrange a bilateral meeting with President Xi for the DPRK delegate Choe, and has not yet had a PRC-DPRK summit. This clearly demonstrates the switched status of the ROK and the DPRK in their respective relationships with the PRC. Thus, some expect that Beijing will abandon Pyongyang, yet that is an unsophisticated desire. In the worst case situation, the PRC may discard the Kim Jong-un regime but never the country itself because it provides valuable strategic interests. Rather, Beijing would support Pyongyang whenever it has a chance despite the high costs. Beijing would not reject unification of the peninsula, but there is a crucial caveat; the unified Korea would have to be friendly toward the PRC.
A hardware framework for smart speaker control of home audio network
Taewan Kim,Sang Hoon Hong,Yunmo Chung IEEE 2010 IEEE transactions on consumer electronics Vol.56 No.4
<P>Multi-channel speaker systems are typically driven by central power amplifiers. This approach has limitations when faced with the increasing number of channels in existing systems. In this paper, more distributed approach to multi-channel systems is proposed where a USB cable is used as an interface to a living room PC to connect to the proposed main controller. The main controller connects all speaker channels serially via a network cable through subcontrollers that are distributed across the rooms. The network cable interface between the sub-controllers and the main controller uses a custom-made transmission protocol. This protocol allows the main controller to provide multiple CD quality audio sources to different locations in a house. Furthermore we demonstrate a bidirectional communication capability to allow seamless personalized listening at all locations in the home with the proposed protocol between the main controller and the sub-controllers.</P>