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Changhee Lee,Eiji Tomota,Nobuyuki Kawahara,Kyungbin Lim,MoonChul Kim 한국자동차공학회 2009 한국자동차공학회 부문종합 학술대회 Vol.2009 No.4
Non-intrusive measurement of transient unburned gas temperatures was developed with a fiber-optic heterodyne interferometry system. Using the value of the Gladstone-Dale constant for DME gas and combustion pressure we can calculate the in-cylinder temperature inside unburned and burned region. In this experimental study, it was performed to set up a fiber-optic heterodyne interferometry technique to measure the temperature before and behind the combustion region in a DME-HCCI engine. At first, measured temperature was almost the same as the temperature history assuming that the process that changes of the unburned and the burned are polytropic. In addition, we measured the temperature after combustion which of condition was burned gas with DME-HCCI combustion.
Development of Optical Device Housing Compacted Using SUS304L Granulated Powders
Suzuki Hironori,Hara Toshihiro,Ogino Yukinobu,Sato Yasushi,Tomota Yo 한국분말야금학회 2006 한국분말야금학회 학술대회논문집 Vol.2006 No.1
In order to develop the SUS304L housing by powder metallurgy for an optical device useful for the FTTH communication system, the optimum compacting pressure and sintering temperature were investigated using granulated powder as the material to satisfy high air-tightness and high laser-weldability. Then the laser-welding test of specimen made under the optimum condition was carried out to observe welding sputters.
Ki Hyuk Kwon,Jae Suk Jeong,Jong-Kyo Choi,구양모,Yo Tomota,김낙준 대한금속·재료학회 2012 METALS AND MATERIALS International Vol.18 No.5
The deformation behavior of Fe-17Mn-0.02C steel containing ε-martensite within austenite matrix has been investigated via in-situ neutron diffraction study at 298 K and 77 K. Based on the analyses of changes in phase fraction and lattice strain, it has been shown that the steel shows the deformation-induced phase transformation of austenite→ε-martensite→α’-martensite and the direct transformation of austenite→α’-martensite at both temperatures. However, the kinetics of such transformations vary with temperature,resulting in a higher and more persistent work hardening at 77 K than at 298 K.