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김영석,김낙배,정기형,박혜일,Kim, Y.S.,Kim, N.B.,Chung, K.H.,Bak, H.I. Korean Nuclear Society 1986 Nuclear Engineering and Technology Vol.18 No.2
The $^{93}Nb(n,n\alpha)^{89m}Y$, $^{93}Nb(n,{\alpha})^{90m}Y$ and $^{93}Nb(n,2n)^{92m}Nb$ cross sections at a neutron energy of 14.6 MeV have been measured relative to the $^{27}Al(n,p)^{27}Mg$ and $^{27}Al(n,{\alpha})^{24}Na$ cross sections. A small accelerator utilizing $T(D,n)^4He$ reaction was used as a neutron source and the neutron energy spread is about 0.4MeV at the sample. All induced activities were measured with a 70cc HPGe detector in the same geometry.
김영석,김준곤,홍완,김덕경,조수영,우형주,김낙배,Kim, Y. S.,Kim, J. M.,Hong, W.,Kim, D. K.,Cho, S. Y.,Woo, H. J.,Kim, N. B. 한국진공학회 1993 Applied Science and Convergence Technology Vol.2 No.4
Hydrogen depth profiling was performed by H(19F, $\alpha$${\gamma}$) nuclear resonance reactin . A cesium sputtering ion sorce and 1.7MV Tandem Van de Graaff accelerator was used for the production of 6.5MeV 19F ion. The ${\gamma}$ rays produced by the reaction were measure dby 3" $\times$3" and 6" $\times$8" Nal detectors . A test measurement was done for hydrogen contaminatin layer of a bare silicon wafer, Si3N4(H) and Zr(O)a-Si/Si for the purpose of verifying the applicability , detection limit and the reliability of the method.ility of the method.
An ERD-TOF System for the Depth Profiling of Light Elements
김영석,우형주,김준곤,김덕경,최한우,홍완,Kim, Y. S.,Woo, H. J.,Kim, J. K.,Kim, D. K.,Choi, H. W.,Hong, W. The Korean Vacuum Society 1996 Applied Science and Convergence Technology Vol.5 No.1
An ERD-TOF system is constructed for the nondestructive depth profiling of light elements in thin films in the range of several thousand angstroms. The particles, recoiled by 10 $MeV^{35}Cl$ projectiles, were detected by a Time-Of-Flight spectrometer composed of a MCP (Micro Channel Plate) and a SSB (Silicon Surface Barrier) detector. A two parameter data acquisition system composed of two PC's was constructed for registering simultaneous time and energy signals. A $Si_3N_4$/poly-Si/$SiO_2$/Si sample was anlayzed and the result is compared with RBS. The detection limit, maximum probable depth and depth resolution for light elements in silicon are about $4\times10^{14}atoms/\textrm{cm}^2$, 5, 000$\AA$ and 100$\AA$, respectively.
김영석(Y. S. Kim),박기철(K. C. Park) 한국자동차공학회 1992 한국자동차공학회 춘 추계 학술대회 논문집 Vol.1992 No.11
A simple simulative test was developed to evaluate stamping formability in plane strain stretching mode. In this test, the stamping formability was evaluated by limit punch. height (LPH) in plane strain punch stretching test (PSST) compared to limit dome height (LDH) in hemispherical punch stretching test. LPH-value in PSST well ranks the stamping formability of various material and correlates with press performance. Moreover by using ultrasonic thickness gauge the plane strain intercept - limit plane strain (FLCo) - in forming limit curve can be accurately determined from thickness measurement around the fracture area. The FLCo derived from thickness measurement well correlates with the results from circle grid analysis for the deformed circle grid marked on the surface of the specimen.
김영석(Y.S.Kim),박기철(K.C.Park),최원집(W.J.Choi) 한국자동차공학회 1993 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
Cup drawing tests were performed to evaluate the friction characteristics of sheet metals.<br/> The 1 inear relationship between drawing force and blank holding force obtained from the cup drawing test was used to calculate the coefficient of friction of the sheet metal.<br/> The friction coefficient was compared to that from conventional<br/> draw bead friction test,<br/> It was clarified that the cup drawing test can be used as a<br/> simple and convenient method for evaluating the friction characteristic of the sheet metal and also lubricity of the lubricant used.<br/> Key words: Stamping formability, Sheet metal, Cup drawing test. Coefficient of friction, Draw bead friction test, Lubricant<br/>
김영석(Y.S.Kim),이중순(J.S.Lee),윤수한(S.H.Yoon),하종률(J.Y.Ha) 한국자동차공학회 1998 한국자동차공학회 춘 추계 학술대회 논문집 Vol.1998 No.5_1
In the gasoline engines of fuel injection type, atomization of fuel droplet and its distribution has influence directly on the decision of engine performance and harmful emission. In this paper, atomization characteristics of fuel spray is investigated with microscopic visualization system. Particle motion analysis system is used to measure the SMD of fuel spray of air-assist injector by initial factors such as temperature of ambient air and air-assist pressure. As air-assist pressure and temperature increase, the SMD is decreased, and its variation is more stable.<br/>