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A Spectropolarimetric Investigation of the Photospheric and Chromospheric Layers of Sunspots
김현남,김갑성,Kim, Hyunnam,Solanki, Sami.K.,Lagg, Andreas,Kim, Kap-Sung,Lim, Daye,Choe, G.S. 한국천문학회 2012 天文學會報 Vol.37 No.2
Spectro-polarimetry is the most powerful technique for deducing the magnetic structure of the Sun. Stokes vector allow us to infer the physical conditions in the solar atmosphere prevailing during the line formation. Inversion codes are the main tool to extract this information from the Stokes spectra. This study will focus on measurements of the chromospheric He I 1083.0 nm triplet and the photospheric Si I 1082.7 nm line. A spectropolarimetric data set of sunspots, obtained with the German Vacuum Tower Telescope (VTT) at the Teide observatory on Tenerife, is analyzed using an inversion technique. We will introduce the German Vacuum Tower Telescope and the inversion code HeLix, and will show data sets that are analyzed by HeLix. Finally I made variety plots and maps for understanding photospheric and chromospheric layers of sunspots.
김현남(HyunNam Kim),조영환(YoungHawn Cho),윤형석(HyungSeuk Yun) 한국자동차공학회 2009 한국자동차공학회 학술대회 및 전시회 Vol.2009 No.11
The Truck chassis frame is one of the most important part to decide the durability performance of the vehicle. Fullvehicle proving ground test will be spent a lot of time and cost. So, Rig test method should be developed for the efficient development of new chassis Frame and the reduction of cost. In this paper, Multi-axial durability test was carried out, and test objective was the 6m3 Mixer Truck Frame&Sub-Frame. Road load data was measured under proving ground, and durability target was calculated using this data. Durability target is consist of 3 alternating loading which includes Vertical bending, Horizontal bending, Frame Torsion. And the correlation was performed by results of full-vehicle test.
대형트럭 리프 스프링 단품 다축리그 시험모드 개발과 유한요소 모델을 이용한 다축내구 해석의 연구
최정헌(JungHun Choi),유승원(Seungwon Yoo),김현남(Hyunnam Kim) 한국자동차공학회 2014 한국자동차공학회 학술대회 및 전시회 Vol.2014 No.11
The leaf spring is one of the most important parts of the vehicle because the damage of the leaf spring leads to lifethreatening accidents. In general, the most typical method of leaf spring durability test that is conducted by manufacturers of leaf spring is vertical load durability test in test lab. However, the leaf spring which has satisfied the target life of the vertical load durability test in test lab couldn"t satisfy the target life of the real vehicle durability test. Therefore, the aim of this study is to develop the Multi-axial Durability Test Mode which is consist of simple sine waves and damage the leaf spring as the same level with the real vehicle durability test in accelerated durability test road. And then, it presents the Multi-axial Fatigue Analysis Method by using Finite Element Model which is validated with the Multi-axial load test result and the Multi-axial Durability Test mode.