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김영석(Young Suk Kim),최승준(Seung Jun Choi),정용무(Yong Moo Cheong) 대한기계학회 2006 대한기계학회 춘추학술대회 Vol.2006 No.11
A Ti-6Al-4V sheet with the α-Ti and the β phase was subjected to electrolytic charging of 1000 ppm H and to constant load tests at temperatures varying from 10 ℃ to 200 ℃. The delayed hydride cracking velocity (DHCV) was determined using compact tension specimens with the pre-fatigued crack growing along the rolling direction of the sheet. The DHCV of the Ti-6Al-4V alloy decreased with the test temperature increasing from 20 to 100 ℃ and also with the test temperature decreasing below the zero temperature. This fact is quite in contrast with the DHCV of Zr-2.5Nb alloys that increases with the increasing temperature from RT to 300 ℃ and decreases at temperatures above 300 ℃. Based on Kim’s DHC model, we have discussed the different temperature dependency of the DHCV for the Ti-6Al-4V alloys and the Zr-2.5Nb both of which have the microstructure of the α- and β-phases.
O, O'-Diethyl DL-1-Aminobenzylphosphonate와 그의 유도체들을 포함한 p-Acetamidobenzenesulfonamide의 합성
김영석,홍석인,김용준,Young Suk Kim,Suk In Hong,Yong Joon Kim 대한화학회 1983 대한화학회지 Vol.27 No.4
새로운 O, O'-diethyl-1-aminobenzylphosphonate와 그의 유도체들을 포함한 다음의 6가지의 p-acetamidobenzenesulfonamide를 합성하였다. O, O'-diethyl N-(p-acetamidobenzenesulfonyl) aminobenzylphosphonate, N-(p-acetamidobenzenesulfonyl) aminobenzylphosphonic acid, O,O'-diethyl N-[N-(p-acetamidobenzenesulfonyl) glycyl] aminobenzylphosphonate, O,O'-diethyl N-[N-(p-acetamidobenzenesulfonyl)-DL-alanyl] aminobenzylphosphonate, O,O'-diethyl N-[N-(p-acetamidobenzenesulfonyl)-L-leucyl] aminobenzylphosphonate, O,O'-diethyl N-[N-(p-acetamidobenzenesulfonyl)-L-phenylalanyl]aminobenzylphosphonate. 모든 화합물은 흰색 결정으로 얻었으며 적외선 분광법과 원소분석으로 확인되었다. Six new compounds of p-acetamidobenzenesulfonamides which contain O, O'-diethyl-1-aminobenzylphosphonate and their derivatives were prepared: O, O'-diethyl N-(p-acetamidobenzenesulfonyl) aminobenzylphosphonate, N-(p-acetamidobenzenesulfonyl) aminobenzylphosphonic acid, O,O'-diethyl N-[N-(p-acetamidobenzenesulfonyl) glycyl] aminobenzylphosphonate, O,O'-diethyl N-[N-(p-acetamidobenzenesulfonyl)-DL-alanyl] aminobenzylphosphonate, O,O'-diethyl N-[N-(p-acetamidobenzenesulfonyl)-L-leucyl] aminobenzylphosphonate, and O,O'-diethyl N-[N-(p-acetamidobenzenesulfonyl)-L-phenylalanyl]aminobenzylphosphonate. All the compounds were obtained as white crystals and characterized by means of elemental analysis and infrared spectroscopy.
수소량에 따른 Zr-2.5Nb 압력관의 DHC 속도 및 K<SUB>IH</SUB>
김영석(Kim Young Suk),박순삼(Soon Sam Park),김성수(Sung Soo Kim),정용무(Yong Moo Cheong),임경수(Kyung Soo Im) 대한기계학회 2002 대한기계학회 춘추학술대회 Vol.2002 No.3
To obtain a better understanding of DHC phenomenon, this study focused on the effect of DHC velocity and threshold stress intensity factor, K1H, of Zr-2.5Nb tubes as a function of hydrogen concentrations. DHC tests were conducted on the compact tension specimens of Zr-2.5Nb with hydrogen concentration varying from 12 to 100 ppm. Hydrogen was charged electrolytically into the CT specimens followed by a homogenization treatment. The DHCV for Zr-2.5Nb pressure tube had an activation energy of 49 KJ/㏖ in a temperature range of 144 and 250℃ and decreased with decreasing hydrogen concentration. The threshold stress intensity factor, K1H in the axial direction of Zr-2.5Nb tube also had a dependence of hydrogen concentration: a exponential decrease of K1H to a constant with increasing hydrogen concentration. Thus, DHCV and K1H were nicely described as a function of the supersaturated hydrogen concentration over TSSD independent of temperatures. Based on these results, we propose that K1H is a critical stress intensity factor to drop a supersaturated hydrogen concentration at the crack tip region to the equilibrium solubility for dissolution at any temperatures. Hence, the lower the initial hydrogen concentration at the matrix region, the smaller a concentration gradient between the crack tip and the matrix region, lowering DHCV.
항복강도에 따른 Zr-2.5Nb 압력관의 Delayed Hydride Cracking Velocity
김영석(Kim Young Suk),정용무(Cheong Yong Moo),임경수(Im Kyung Soo),김인섭(Kim In Sup),마르켈로프(V. Markelov) 대한기계학회 2003 대한기계학회 춘추학술대회 Vol.2003 No.8
The objective of this study is to investigate the delayed hydride cracking velocity (DHCV) of Zr-2.5Nb pressure tubes with yield strength. DHC tests were conducted at an initial K₁ of 19 ㎫√m and 250℃ on the compact tension specimens containing 100 ppm hydrogen that were taken from the Zr-2.5Nb tubes with different yield strengths. The crack growth was determined with the direct current potential drop method. A nice correlation of the DHC velocity and the yield strength was obtained at all temperatures by normalizing the DHCV with the terminal solid solubility and diffusion of hydrogen: the DHCV increased exponentially with increased yield strength of the Zr-2.5Nb tubes. In contrast, the texture and the distribution of the β-Zr phase were found to have a comparatively minor effect on the DHCV of the Zr-2.5Nb tubes. Yield strength of the Zr-2.5Nb tubes determines a plastic zone size with a steep gradient of hydrogen concentration ahead of the crack tip where hydrides can be precipitated. The yield strength effect is discussed by correlating the plastic and the striation spacing observed on the fractured surfaces as a function of yield strengths.
김영석(Kim Young Suk),서용찬(Suh Yong Chan),안상복(Sang Bok Ahn),정용무(Cheong Yong Moo),임경수(Im Kyung Soo) 대한기계학회 2001 대한기계학회 춘추학술대회 Vol.2001 No.3
With a view to assessing a change in the creep rate of the Zr-2.5Nb pressure tubes operating in the reactor with the operation time, Zr-2.5Nb sheets were made with four different kinds of manufacturing process to simulate a microstructural change of the pressure tubes with time. The creep tests were conducted on the Zr-2.5Nb sheets at temperatures ranging from 623 to 673 K and constant stress of 120 ㎫. As an indirect evaluation of the Nb content dissolved in the α-Zr grains, the Nb content in the β-Zr phase of Zr-2.5Nb sheets made with 4 different processes was measured using a replica method. Zr-2.5Nb made with process P1 had the lowest creep rate while that made with process P3 or P4 had the highest creep rate. By correlating the Nb content in the α-Zr grains with the creep rate and strength of the Zr-2.5Nb sheets, we conclude that the Nb contents dissolved in the the c-Zr grains governs the creep rate and strength of Zr-2.5Nb alloy. A change in the creep rate of the Zr-2.5Nb pressure tubes was discussed on the basis of a fact that α-Zr grains in the Zr-2.5Nb pressure tubes have the Nb content decreasing with the operation time increasing.
정용주(Yong Ju Jung),김영석(Young Suk Kim),Troung Cong Thang,노용만(Yong Man Ro),김태희(Tae-hee Kim),김재곤(Jae-Gon Kim) 한국방송·미디어공학회 2004 한국방송공학회 학술발표대회 논문집 Vol.2004 No.-
본 논문에서는 다양한 사용자 환경에서 비디오의 범용적인 서비스를 위한 다차원 비디오 트랜스코딩의 판단에 관하여 논한다. 효율적인 판단을 위해 여러 영화 비디오 클림들을 비슷한 의미적 개념을 가지는 비디오들과 비슷한 장면 복잡도를 가지는 비디오들로 분류하고, 각 종류별로 주관적인 테스트(subjective test)를 실시하여 비디오 트랜스코딩에 있어서 사용자 인지(perception)의 특성을 분석한다. 이렇게 분석된 인간의 시각 특성들을 이용해 비디오 트랜스코딩 판단 궤적(trajectory)을 만들고 이를 다차원 비디오 트랜스코딩 판단 시에 적용하기 위한 방법을 제안한다.
에너지소비량 및 이산화탄소 배출량 분석을 통한 건축 바닥 컴포넌트의 친환경 성능 평가에 관한 연구
김정용(Kim Jung-Yong),김영석(Kim Young-Suk),김재준(Kim Jae-Jun) 대한건축학회 2008 대한건축학회논문집 Vol.24 No.11
The global warming has been raised as the most serious problem all over the world at the present and many countries have been working out to reduce carbon dioxide emission which is the main factor to occur the global warming. The carbon dioxide is generated in all industries and particularly, construction industry occupy 42% of all industry wastes. Therefore, it is sorted as the environment obstruction industry. So, the development of environmentally sustainable construction materials is required to reduce carbon dioxide on the stage of producing construction materials. In this study, the energy consumption and carbon dioxide emission in the object floor components are analyzed and compared to each other with SUSB-LCA ver 1.0. As the result, it is analyzed that dry double floor has the best performance and has the worst performance in terms of environmentally sustainable performance.