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기계적 밀링 및 방전 플라즈마 소결 공정을 이용한 벌크 비정질 복합재의 제조
이진규,김택수,김정곤,Lee, Jin-Kyu,Kim, Taek-Soo,Kim, Jeong-Gon 한국분말야금학회 2007 한국분말재료학회지 (KPMI) Vol.14 No.3
Bulk metallic glass (BMG) composite was fabricated by consolidation of milled metallic glass composite powders. The metallic glass composite powder was synthesized by a controlled milling process using the Cu-based metallic glass powder blended with 30 vol% Zr-based metallic glass powders. The milled composite powders showed a layered structure with three metallic phases, which is formed as a result of mechanical milling. By spark plasma sintering of milled metallic glass powders in the supercooled liquid region, a fully dense BMG composite was successfully synthesized.
Spark Plasma Sintering에 의한 가스분무 Mg-Zn-Y 합금분말의 성형특성
이진규,김택수,배정찬,Lee, Jin-Kyu,Kim, Taek-Soo,Bae, Jung-Chan 한국분말야금학회 2007 한국분말재료학회지 (KPMI) Vol.14 No.2
Using Spark Plasma Sintering process (SPS), consolidation behavior of gas atomized $Mg_{97}Zn_1Y_2$ alloys were investigated via examining the microstructure and evaluating the mechanical properties. In the atomized ahoy powders, fine $Mg_{12}YZn$ particles were homogeneously distributed in the ${\alpha}-Mg$ matrix. The phase distribution was maintained even after SPS at 723 K, although $Mg_{24}Y_5$ particles were newly precipitated by consolidating at 748 K. The density of the consolidated bulk Mg-Zn-Y alloy was $1.86g/cm^3$. The ultimate tensile strength (UTS) and elongation were varied with the consolidation temperature.
이진규,김택수,Lee, Jin-Kyu,Kim, Taek-Soo 한국분말야금학회 2007 한국분말재료학회지 (KPMI) Vol.14 No.6
The Cu-based bulk metallic glass (BMG) composite was fabricated by spark plasma sintering (SPS) using of gas-atomized metallic glass powders and ductile brass powders. No defect such as pores and cavities was observed at the interface between the brass powder and the metallic glass matrix, suggesting that the SPS process caused a severe viscous flow of the metallic glass and brass phases in the supercooled liquid region, resulting in a full densification. The BMG composites shows some macroscopic plasticity after yielding, although the levels of strength decreased.
외국인 전문 인력과 조직 혁신성과간의 관계 및 다양성 친화형 인적자원관리의 조절역할에 대한 연구
이진규 ( Jin Kyu Lee ),김태규 ( Tai Gyu Kim ),김학수 ( Hack Soo Kim ),이준호 ( Jun Ho Lee ) 한국지식경영학회 2013 지식경영연구 Vol.14 No.2
In an ever-tougher competitive environment caused by globalization, domestic companies are increasingly adopting business strategies aimed at continuously securing competitive advantage by taking advantage of globally-competitive foreign professionals. Despite a persistent rise of such trend, domestic researches regard migrant workers as the socially underprivileged, and delve into the issue of migrant workers from the policy, welfare, and ethical perspectives. With a growing need to deal with migrant professionals from the strategic viewpoint ? to acquire professional talent in an era of global competition, it becomes essential to verify the real effectiveness of migrant professionals. Yet, there has been relatively little discussion of it. This study assumes that based on th137e integration-learning perspective on diversity, the greater the number of foreign professionals, the greater the effect on organizational innovative performance. Also could be effective in managing diversity is diversity-friendly HRM which involves eliminating discrimination against migrant professional workers and treating them fairly. Based on the data collected from 72 domestic companies, this study conducted an empirical analysis of the impact of the percentage of foreign professionals in the total workforce on organizational innovative performance and of the moderating role of diversity-friendly HRM. The results show that the proportion of foreign professionals in the entire workforce has had no significant impact on organizational innovative performance, and that the proportion of foreign professionals in the total workforce and diversity-friendly HRM have had a interaction effect on organizational innovative performance. Based on these research results, the study attempted to interpret the significance of the proportion that migrant professionals make up of the total workforce and of diversity-friendly HRM in relation to organizational innovative performance, and their implications for diversity management.
파라쿼트 중독환자에서 Hart 생존율 곡선의 중요성과 예후인자
김정화 ( Kim Jeong Hwa ),이영희 ( Lee Yeong Hui ),신성혜 ( Sin Seong Hye ),김바울 ( Kim Ba Ul ),이재규 ( Lee Jae Gyu ),이지은 ( Lee Ji Eun ),이진규 ( Lee Jin Gyu ),이광영 ( Lee Gwang Yeong ) 대한신장학회 2004 Kidney Research and Clinical Practice Vol.23 No.2
배 경 : 파라쿼트 (paraquat)는 제초제로 사용되는 맹독성 농약으로 소량의 섭취로도 사망할 수 있으며, 환자나 보호자의 진술에 의한 섭취량, 검사실 소견, 소변 dithionite 검사 등의 결과만으로 중독의 정도 및 예후를 간접적으로 판정하여 치료의 지표로 삼고 있다. 방 법 : 저자들은 파라쿼트 중독 환자의 예후에 영향을 미치는 인자들을 조사하고, Hart 등이 제시한 생존곡선을 이용한 예후 판정이 가능한지, 그리고 어떤 지표를 이용하여 치료 방침을 결정할지를 알아보기 위해, 음독 후 24시간 이내에 환자의 혈중 파라쿼트 농도를 측정하여, Hart 등이 제시한 생존곡선을 기준으로 90% 생존곡선 이하의 농도군을 A군, 90% 생존곡선과 70% 생존곡선 사이의 농도군을 B군, 70% 생존곡선과 50% 생존곡선 사이의 농도군을 C군, 50% 생존곡선과 30% 생존곡선 사이의 군을 D군, 30% 생존곡선과 20% 생존곡선 사이의 농도군을 E군 20% 생존곡선과 10% 생존곡선 사이의 농도군을 F군, 10% 생존곡선 보다 높은 농도 군을 G군으로 구분하여 각 군의 생존율과 사망률을 분석하였다. 결 과 : 1958년 2월부터 2003년 2월까지 내원하여 치료받은 파라쿼트 중독 환자 516명 중 24시간 이내에 내원하여 치료받은 175명의 환자들을 대상으로 다음과 같은 결과를 얻었다. 환자의 연령은 45.6±17.1세, 남자 101명 여자 74명, 전체 환자 사망률은 69.1%였다. 환자 수는 A군 27명, B군 15명, C군 8명, D군 9명, E군 11명, F군 12명, G군 93명이었으며, 각 군의 사망률은 A군 7.4%, B군 26.7%, C군 37.5%, D군 55.6%, E군 63.6%, F군 83.3%, G군 96.8%로 유의한 차이를 나타내었으며 (p<0.0005), Hart의 생존곡선을 이용하여 예후를 정확하게 예측할 수 있었다. 사망에 영향을 미치는 위험 인자로 24시간 이내의 혈장 파라쿼트 농도군이 가장 중요하여 odds ratio (95% confidence interval)가 B군 4.4 (0.7-27.5), C군 7.2 (0.9-54.9), B군 15.0 (52.1-105.6), E군 21.0 (3.2-139.7), F군 60.0 (7.4-487.1), C군 359.9 (56,9-2277.9)으로 음독양, 소변 dithionite test 보다 중요하였다. 결 론 : 파라쿼트 중독 환자의 예후 판정에서 음독양, 소변 dithionite 검사보다는 24시간 이내에 혈중 paraquat 농도를 측정하여, Hart 생존곡선을 이용한 예후 판정이 가장 정확하며, 이 결과를 이용하여 치료 방침을 정하는 것이 중요하리라 사료된다. Background : Paraquat is highly toxic herbicide used in agriculture, and mortality of paraquat poisoning is very high. The predictions of severity of poisoning assessed with the amount of ingestion, results of urine dithionite test and laboratory findings are not accurate. The aims of this study are to investigate whether Hart`s probability of survival curves are useful for predicting outcomes of paraquat-poisoned patients and which factors influence the outcomes of the patients. Methods : We grouped 175 patents with paraquat poisoning into seven groups using curves of probability of survival suggested by Hart, et al. Group A was patients with plasma paraquat concentration be low 90% probability of survival curve, group B patients with paraquat levels between 90% and 70% probability of survival curves, group C patients with paraquat levels between 70 and 50% probability of survival curves, group D the ones with paraquat levels between 50% and 30% probability of survival curves, group E the ones with paraquat levels between 30 and 20% probability of survival curves, group F paraquat levels between 20 and 10% probability of survival curves, and group G patients with paraquat levels above 10% probability of survival curve. And we analyzed the survival and mortality rates of each groups. Results : The mortality rates of groups A, B, C, D, E, F and G were 7.1%, 26.7%, 37.5%, 55.6%, 63.6%, 83.3% and 96.8% respectively (p<0.0005). The most important risk factor for death of patients was the paraquat concentration grouping with odds ratios (95% CI) of 4.4 (0.7-27.5, group B), 7.2 (0.9-54.9, group C), 15.0 (52.1-105.6, group D), 21.0 (3.2-139.7, group E) 60.0 (7.4-487.1, group F), and 359.9 (56.6-2277.9, group G). Conclusion : In assessing prognosis of patients with paraquat poisoning, grouping of the patients using initial plasma paraquat concentrations is the most important, and the policy of treatment can be decided according the results. (Korean J Nephrol 2004;23(2):270-277)