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7050 고력알루미늄합금의 응력부식성에 미치는 결정조직의 영향
이진형,정영훈,허성우,이용연,신명철 대한금속재료학회(대한금속학회) 1988 대한금속·재료학회지 Vol.26 No.4
A 7050 high strength aluminum alloy was processed by three different methods to obtain the microstructures containing a large amount of deformed grains and the ones containing considerable amount of subgrains and recrystallized grains, respectively. The differences of the microstructure before and after T6 temper were investigated by optical and electron microscopes, and the average stress corrosion crack velocity vs. the stress intensity factor was measured by precracked CT specimens. The effect of the grain characteristics on the stress corrosion cracking susceptibility was more pronounced before T6 temper than after T6 temper. The resistance of the materials containing deformed grains and subgrains to stress corrosion cracking was superior to that of the materials containing recrystallized grains. The stress corrosion cracking susceptibility depended largely on the behavior of grain-boundary precipitates.
허민(Heo, Min),박정현(Park, Joung Hyun),윤종성(Yoon, Jong Seong),박명진(Park, Myong Jin) 한국측량학회 2009 한국측량학회 학술대회자료집 Vol.2009 No.4
기존의 수치지도는 2차원 도엽기반으로 되어 있어 정확성 및 최신성을 요하는 사용자의 요구조건을 충족하기에 많은 어려움이 있다. 본 연구에서는 객체형 연속수치지도의 요구사항을 분석하고 관련 시스템을 설계하였다. 객체형 연속수치지도는 3차원 연속객체로 최선성과 정확성을 갖고 있으며, 관리, 변환, 서비스, 변화정보관리, 수신갱신 및 동시갱신 시스템으로 세분화하여 시스템을 설계하였다. As a digital map is tile based of 2D, it is difficult to be satisfied with accuracy and up-to-date. In this study, we analyzed requirements of an object-oriented continuous digital map and designed the system. The digital map is 3D continuous object and has the accuracy and up-to-date, and designs with management system, transfer system, change information management system, frequent updating system and , same time updating system.
Lee Jun Myong,Kim Hye Won,Heo So Young,Do Kyung Yi,Lee Jun Deok,Han Seul Ki,Baik Soon Koo,Kim Moon Young,Chang Sei-Jin 대한의학회 2023 Journal of Korean medical science Vol.38 No.34
Background: This study aimed to determine whether serum uric acid (SUA) levels are associated with various indices of liver damage in the adult Korean population. Methods: We used the Seventh (VII) Korean National Health and Nutritional Examination Surveys. Our study population comprised 6,007 men and 8,488 women. Levels of SUA were divided into four groups (≤ 5.3, 5.3–6.0, 6.0–7.0, and > 7.0 mg/dL for men and ≤ 4.0, 4.0–4.8, 4.8–6.0, and > 6.0 mg/dL for women). Elevated liver enzyme levels were defined as > 35 (men) and > 31 (women) IU/L for aspartate aminotransferase (AST), > 45 (men) and > 34 (women) IU/L for alanine aminotransferase (ALT). Hepatic steatosis index and fibrosis (FIB)-4 index was used to determine nonalcoholic fatty liver disease (NAFLD) and liver FIB, respectively. Adjusted odds ratios (aORs) were calculated by logistic regression analysis for liver enzymes, NAFLD, and liver FIB, according to the SUA level. Results: Among women, the 4.8–6.0 and > 6.0 mg/dL SUA groups showed higher ORs of elevated AST (aOR, 1.78 and 2.03; 95% confidence interval [CI], 1.37–2.32 and 1.40–2.96, respectively; P < 0.001) and the 4.0–4.8, 4.8–6.0, and > 6.0 mg/dL SUA groups showed a higher ORs of ALT elevation (aOR, 1.35, 2.26, and 2.37; 95% CI, 1.02–1.79, 1.72–2.97, and 1.60–3.50, respectively; P < 0.001) compared to the lowest level SUA group. Among women with normal ALT, > 6.0 mg/dL SUA group showed higher OR of NAFLD status (aOR, 1.52; 95% CI, 1.06–2.19). Among men and women with NAFLD, hyperuricemia showed higher ORs of liver FIB (aOR, 2.25 and 1.89; 95% CI, 1.21–4.19 and 1.09–3.27, respectively) than the lowest level SUA group. Conclusion: High SUA levels may be associated with elevated liver enzymes and NAFLD, mainly in women. Even in women with normal ALT levels, SUA levels may predict the NAFLD status. Hyperuricemia may predict advanced liver FIB in both men and women with NAFLD. Further studies investigating the causal effects of SUA on liver damage are required.
Carbon and nitrogen storage in an age-sequence of Pinus densiflora stands in Korea.
Noh, Nam-Jin,Son, Yowhan,Lee, Sue-Kyoung,Seo, Kyung-Won,Heo, Su-Jin,Yi, Myong-Jong,Park, Pil-Sun,Kim, Rae-Hyun,Son, Yeong-Mo,Lee, Kyeong-Hak Jointly published by Science China Press and Sprin 2010 Science China. Life sciences Vol.53 No.7
<P>The carbon (C) and nitrogen (N) storage capabilities of Pinus densiflora in six different stand ages (10, 27, 30, 32, 44, and 71 years old) were investigated in Korea. Thirty sample trees were destructively harvested and 12 were excavated. Samples from the above and belowground tree components, coarse woody debris (CWD), forest floor, and mineral soil (0-30 cm) were collected. Tree biomass was highest in the 71-year-old stand (202.8 t ha(-1)) and lowest in the 10-year-old stand (18.4 t ha(-1)). C and N storage in the mineral soil was higher in the 71-year-old stand than in the other stands, mainly due to higher soil C and N concentrations. Consequently, the total ecosystem C and N storage (tree+forest floor+CWD+soil) was positively correlated with stand age: increasing from a minimum in the 10 year old stand (18.8 t C ha(-1) and 1.3 t N ha(-1)) to a maximum in the 71-year-old stand (201.4 t C ha(-1) and 8.5 t N ha(-1)). The total ecosystem C storage showed a similar sigmoidal pattern to that of tree C storage as a function of the age-sequence, while N storage in the CWD, forest floor and mineral soil showed no significant temporal trends. Our results provide important insights that will increase our understanding of C and N storage in P. densiflora stands and our ability to predict changes according to stand age in the region.</P>