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깨끗한 Si(001) 표면의 buckled dimer 구조 연구 : a(2×1)과 c(4×2)
김성수(S. S. Kim),김용욱(Y. W. Kim),박노길(N. G. Park),조원석(W. S. Cho),김주영(J. Y. Kim),채근화(K. H. Chae),황정남(C. N. Whang),김기석(K. S. Kim),최대선(D. S. Choi) 한국진공학회(ASCT) 1998 Applied Science and Convergence Technology Vol.7 No.1
CAICISS장치를 이용하여 깨끗한 Si(001) 표면에서 재배열하는 dimer의 원자구조를 분석하였다. Si(001) 표면에서 dimer 원자가 확실히 buckled 되어 있음을 확인하였고, asymmetry(2×1)구조와 c(4×2)구조가 공존하고 있음을 밝혔다. dimer 원자의 결합거리는 2.3±0.1 Å이고, buckling 각은 18±1° 였다. The geometric structure of dimer atoms on clean Si(001) surface was studied using CAICISS. We confirmed that dimer atoms were certainly buckled, and also found that asymmetry (2×1) and c(4×2) were coexisted. The intradimer bond length and the buckling angle of a dimer measured by CAICISS system were 2.3±0.1 Å and 18±1°, respectively.
문병영(B.Y. Moon),송우진(W.J. Song),김용욱(Y.W. Kim),강범수(B.S. Kang) 대한기계학회 2002 대한기계학회 춘추학술대회 Vol.2002 No.5
This paper presents an analytic method and a design technique for golf shoes with coolant in the<br/> insole. The golf shoes are modeled using the finite element method for precision by considering the<br/> configuration of the insole, the midsole and the outsole, which compose the golf shoes. The values of<br/> standard human foot temperature for heat transfer boundary conditions are adopted for the FEA(Finite<br/> Element Analysis). By the commercial FEM software for heat transfer analysis, MARC V7.3, the<br/> temperature and the amounts of heat flux change for the insole are obtained, respectively. It can be<br/> concluded that results obtained by FEM in the insole are different depending on the characteristic of<br/> heat transfer. The results reported herein provide better understanding of analyzing the golf shoes.<br/> Moreover, it is believed that those properties of the results can be utilized in the shoes industry to<br/> develop the effective design method.
김용욱(Y. W. Kim),박노길(N. G. Park),김기석(K. S. Kim),황정남(C. N. Whang),김성수(S. S. Kim),허경미(K. M. Huh),최대선(D. S. Choi) 한국진공학회(ASCT) 1994 Applied Science and Convergence Technology Vol.3 No.1
장전자 방출법을 이용하여 kink 또는 loosely closed pack의 텅스텐 결정면((310), (221), (211))의 수소흡착에 대한 일함수의 변화를 측정하고 상대 흡착율을 주입량과 일함수의 변화로 결정할 수 있는 방법을 제시하였다. 또한 (310)면과 (221)면에 대한 수소의 heat of desorption을 측정하였으며 초고진공 장치내에서 팔라듐의 수소 source로서의 가능성을 확인하였다. Work function changes for various W planes, i.e. (221), (310), (211), induced by hydrogen adsorption have been measured using a field electron emission method and Fowler Nordheim equation. We have also measured the heat of desorption of these planes. An empirical relation between coverage and dose was obtained. And a possibility of palladium as a hydrogen source in a UHV system was discussed.
Y.W. KIM(金容旭),헤리 마이너(H.C. MINOR),J.I. LEE(李正日) 한국육종학회 1981 한국육종학회지 Vol.13 No.1
Laboratory experiments were conducted to ascertain responses of soybeans to water stress during germination. Germination of 101 genotypes was measured under water stress at 25℃. Nine genotypes among the 101 tested were consistently ranked ‘high’ for germination at -3, -6, -12 and -15 bars soil moisture tension. Most genotypes germinated at levels up to -12 bars, but failed to germinate at -15 bars. The critical soil moisture for soybean germination was between -12 and -15 bars. Both genotype and moisture × genotype interactions were highly significant sources of variation for germination and seedling growth. The soil moisture level × genotype interactions were largely due to differences in magnitude of responses rather than to direction of responses to the decreasing soil moisture. The specific effect of soil moisture treatment on germination and seedling growth was confounded by initial differences in seed quality.
이종건(J. K. Lee),이형근(H. K. Lee),김용욱(Y. W. Kim),정대영(K. Y. Jung),이종승(C. S. Yi),김사진(S. J. Kim),나종구(J. G. Rha),김수평(S. P. Kim) 대한산부인과학회 1999 Obstetrics & Gynecology Science Vol.42 No.12
목적: 자간전증의 병태생리를 근거로 한 생화학적 표지물질로서 VCAM-1, PDGF-AB, Antithrombin III, D-dimer의 의의와 유용성을 연구하기 위함. 방법: 정상산모 15례와 자간전증 352례의 환자에서 VCAM-1, PDGF-AB, Antithrombin-III, D-dimer의 혈장 농도를 측정하여 비교하고 자간전증 환자에서 산전,산후 농도를 비교하였다. 정상 산모에서의 각 표지물질의 평균±2표준편차 또는 평균±1표준편차의 기준값을 기준으로하여 각 표지물질의 민감도, 특이도, 양성예측값 및 음성 예측값을 구하였다. 결과: VCAM-1, AT-III, D-dimer값은 정상 산모와 자간전증 환자 사이에 유의한 차이가 있었지만 PDGF-AB의 값은 유의한 차이가 없었다. 정상 산모의 평균 ±2표준편차를 기준값으로 했을 때 VCAM-1, AT-III 그리고 D-dimer 각각의 민감도는 38%, 34% 그리고 40% 였으며 각각의 특이도는 100%, 87% 그리고 100%, 각각의 양성예측값은 100%, 86% 그리고 100%였고, 각각의 음성예측값은 57%, 36% 그리고 42%였다. 정상산모의 평균 ±1표준편차를 기준값으로 했을 때 VCAM-1, AT-III 그리고 D-dimer 각각의 민감도는 43%, 51%, 60%이고, 각각의 특이도는 80%, 87%, 80%이다. 각각의 양성 예측값은 64%, 90%, 88%이고, 각각의 음성 예측값은 50%, 43%, 46%였다. 결론: VCAM-1, AT-III 그리고 D-dimer와 같은 생화학적 표지물질의 조합은 자간전증에서 생화학적 표지물질로서 유용할 것으로 사료된다. Background and Puropse: The pathophysiologic features of preeclampsia are poorly understood. The diagnosis of preeclampsia is based not on the pathophysiology, but on the clinical symptoms. The endothelial dysfunction and the intravascular coagulopathy secondary to it, might be pivotal in the pathophysiology of preeclampsia. The purpose of this study is to investigate the significance of the potential biomarkers based on pathophysiology in preeclampsia. Methods: The vascular cell adhesion molecule-1 (VCAM-1), platelet-derived growth factor (PDGF-AB), antithrombin-III (AT-III) and D-dimer were measured in the plasma of the normotensive pregnant(control group) and preeclamptic women(study group). On the basis of the mean ±2SD or mean ±1SD cut-off value of biomarkers in control group, the sensitivity, specificity, positive predictive value and negative pred ctive value of each marker were calculated. Results: There were significant differences in VCAM-1, AT-III and D-dimer between control and study group. But the levels of PDGF were not significantly different from each other. With the mean±2SD cut-off value, the sensitivities of VCAM-1, AT-III and D-dimer were 38%, 34% and 40%, respectively. The specificities of VCAM-1, AT-III and D-dimer were 100%, 87% and 100%, respectively. Their positive predictive values were 100%, 86% and 100%, respectively. Their negative predictive values were 57%, 36% and 42%, respectively. With the mean ±1SD cut-off value, the sensitivities of VCAM-1, AT-III and D-dimer were 43% 51% and 60%,respectively Their specificities are 80%, 87% and 80%, respectively. Their positive predictive values were 64%, 90% and 88%, respectively. Their negative predictive values were 50%, 43% and 46%, respectively. Conclusion: The combination of these biomarkers such as VCAM-1, AT-III and D-dimer may be more useful as a biomarker in preeclampsia.
제비콩(Dolichos lablab L.) 잎 추출물이 쥐의 혈청효소활성에 미치는 영향
김용욱 ( Kim Y. W ),최우철 ( Choi W. C ),신미경 ( Shin M. K ),한성회 ( Han S. H ),임세진 ( Um S. J ),김명애 ( Kim M. A ) 한국유기농업학회 2001 韓國有機農業學會誌 Vol.9 No.3
The effect of Dolichos lablab leave extract on enzyme activities in mice blood was investigated in this study to clarify the new useful application of the plant leaves. There were not significant differences in the enzyme activities in mice blood among treatment fed with the leave extract and non fed control. The feeding treatment with the extract showed a tendency to activity compared to the non fed control. The activities of glutamate oxaloacetate transaminase, glutamate pyruvate transaminase and lactate dehydrogenase in mice blood at the treatment fed with lead and the leave extract were significantly low compared to their activities at the non fed treatment with the extract, respectively. The choline esterase activity was high at the leave extract feeding. The cadmium dietary treatment showed the same result as the lead treatment. In conclusion, the physiological function of the Jebikong leave was significantly in creased when the mice was stressed by the heavy metal intake. Therefore, the plant leave extract would consider the reduction of heavy metal effect.
Relationship between Seed Leakage Solutes during Imbibition and Germinability on Soybeans
Y.W. KIM(金容旭),J.I. LEE(李正日) 한국육종학회 1981 한국육종학회지 Vol.13 No.2
Laboratory experiments were conducted to evaluate seed leakage solutes during imbibition as physiological character associated with germinability of soybeans. The electrical conductivities of the leakage solutes of soybean seeds from four varieties Essex, Pickett, Wayne and Bonus were measured at different temperatures and soaking time. As time and temperature increased, leakage solutes from the seeds become significantly pronounced. There were significant differences in the leakage solutes among varieties. The average electrical conductivity of leakage solutes from Essex and Pickett after 40 minutes soaking was significantly lower at 20, 25 and 30℃ than those of Wayne and Bonus. The conductivity of leakage solutes was negatively correlated with subsequent seedling growth of soybean seeds.