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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.
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김영석(Y. S. Kim),최명일(M. I. Choi),김종민(C. M. Kim),방선배(S. B. Bang),송길목(K. M. Shong),곽동순(D. S. Kwag) 대한전기학회 2013 전기학회논문지 Vol.62 No.5
In this study, degradation was observed by irradiating UV rays to the polymer insulators which have been widely used in outdoor electric power facilities. For an indoor accelerated UV test, 0.55 w/m2 of UV rays were applied using a xenon-arc method. A UV detection system with 65 Ø㎜ in diameter, 100 ㎜ in length and 1.0 of brightness (F/#) has been designed. Even though efflorescence on the surface of polymer insulators wasn"t observed according to the accelerated UV test. UV rays were detected at around 50% and 40% of insulation breakdown in EPDM and silicone-type insulators respectively. As degradation continued because of an indoor accelerated UV test, breakdown voltage with which UV rays can be detected in an early stage decreased as well. A silicone polymer insulator would be severer than EPDM polymer insulator in terms of surface degradation because of UV strength against Vm/VBD was high in silicone polymer insulators. UV strength in silicone-type insulators increased at 1,000 kJ/㎡ because contact angle at the intial stage sharply decreased to from 113° to 92.1°
김영석(Y.S.Kim),김활홍(W.H.Kim),박기철(K.C.Park) 한국자동차공학회 1994 한국자동차공학회 춘 추계 학술대회 논문집 Vol.1994 No.11_1
To improve the press formability of various automotive steel sheets the modification of the quality of the washing and rust-preventive lubrication oil used in the press operation has been considered. Several new lubrication oils having one or two lubrication additives were prepared and tested. The lubricity and the press formability of the tested lubrication oils were compared each other. Among these the best lubrication oil showing the uniform and good friction characteristic for various steel sheets has been chosen.<br/>