Mechanical Characterization of Nano-Structured Materials Using Nanoindentation

( Ju Young Kim ),( Sung Hoon Kim ),( Jung Suk Lee ),( Kyung Woo Lee ),( Dong Il Kwon ) 대한금속재료학회 ( 구 대한금속학회 ) 2006 METALS AND MATERIALS International Vol.12 No.3

The principal strengths of the nanoindentation technique, which is used extensively to measure the mechanical properties of nano/micro materials, are easy sample preparation and simple experimental method. Hardness and Young`s modulus are essential properties measured by nanoindentation; hardness corresponds to resistance to plastic deformation whereas Young`s modulus is related to elastic deformation. Two key difficulties arise in association with nanoindentation on small volumes: measurement accuracy and material response. Here we discuss the indentation size effect (ISE) considering tip bluntness and variation in hardness of nano-multilayers with a bilayer period, representative research on measurement improvement, and material response at nanoscales.

젊은 남자 성인의 칼슘과 철의 영양상태에 관한 연구

박영숙,곽주영,권지혜,류화라 순천향대학교 기초과학연구소 2002 순천향자연과학연구 논문집 Vol.8 No.1

A survey was performed to 174 male young men who were living alone(40 persons) and shared living with friends(4143 persons) in Chungnam province. Their average age was 22.6 years old, height 171.8 ㎝, and weight 65.6 ㎏. Their daily calcium intake level was averaged 271.9±169.1 ㎎, which was 38.8 %RDA. Comparing calcium intake of each mealtime, breakfast, lunch, dinner, and snacks were composed of 18.6%, 30.0%, 34.0% and 17.4%, respectively. Their daily iron intake level was averaged 8.9±10.8 ㎎, which was 74.3 %RDA. Comparing iron intake of each mealtime, breakfast, lunch, dinner, and snacks were composed of 15.4%, 33.6%, 36.3% and 14.7%, respectively. These results suggested that deficiency of the two minerals in young male adults were severe and the nutrient qualities were also poor, no matter of their living alone or with accompanies. The deficiency was more profound in calcium than iron. And we observed iron nutriture differed significantly according to their living status, such as iron intake and its %RDA were significantly worse in single living subjects than the others. However calcium did not show significant difference. We concluded that shared living environment in young male adults could possibly improve their dietary mineral intake levels.

장기간 항갑상선제 투여 후 임의 중단 뒤 재복용시 발생한 무과립구증 1 예

김승만;김태영;박수영;배영환;서영경 정은주;김태균;권민정;박정현;이순희 인제대학교 2011 仁濟醫學 Vol.32 No.-

Agranulocytosis, one of the major side effects of antithyroid a gents, probably occurs in less than 0.25% of cases treated with antithyroid agents. It usually occurs within the first several weeks or months after the initiation of therapy, when drug dosage is higher. Most reported cases of agranulocytosis have occurred during the first 3 months of therapy. We describe here a rare case that did not experience the side effect for 6 years of antithyroid agent treatment but presented with agranulocytosis in one month after re-exposure. It suggests that the major side effect such as agranulocytosis can occur in patients who had undergone prior uneventful antithyroid drug therapy.

벼 상온 저장 시기별 쌀 품질 변화

권석주,송영은,권영립,이덕렬,조승현,최동철 원광대학교 2005 論文集 Vol.35 No.-

Increasing concern about a rice quality, it is considered postharvest technology as well as cultivation management as an important factor. Therefore it is necessary to find optimal drying, storage method that did not affected a rice quality. In order to find the optimum storage period of rice, the rice quality was investigated during storage period. The temperature and humidity of storage bin were greatly changed but those of rice were a little do. The germination rate was slowly decreased as the storage period is long. The content of moisture was affected by a room temperature, it was increased at stored rice in rainy season(10-Jul~20-Jul). As storage period is long, the content of amylose, fatty acidity were a just Little changed but did not showed a constant tendency to it. The content of protein was increased and mechanic palatability value was decreased during storage period. The chromaticity of milled rice showed a range of lightness(L); 75.15~71.75, redness(a); 0.21~0.91, yellowness(b); 16.78~19.28 during storage period.

A study on carbon emission based heterogeneous vehicle routing

Young-Jae Choi,Yong-Ju Kwon1,Dong-Ho Lee 한국경영과학회 2012 한국경영과학회 학술대회논문집 Vol.2012 No.5

We consider the problem of determining a set of vehicle routes starting/ending at the depot while satisfying customer demands and vehicle capacities for a given heterogeneous fleet of vehicles. As an extension of the previous studies, this study considers carbon emission for the objective of minimizing the sum of variable operation costs and carbon emission cost/benefit. As an earlier study on carbon emission based heterogeneous vehicle routing, we develop a mixed integer programming model and suggest two types of meta-heuristics, simulated annealing and tabu search, due to the complexity of the problem. Computational experiments were done on the benchmark instances with certain modifications, and the results are reported.

위암발증 원인에 대한 생활습관 및 영양섭취에 있어서 농촌지역 주민 조사 : 강원도 화천군 주민의 Helicobacter pylori 감염률을 중심으로 Infection of Helicobacter pylori in Whachon Area, Kang-Won Do

권태봉,이정선,우영국,이명헌,정철원,주진순 한국식품영양학회 1999 韓國食品營養學會誌 Vol.12 No.1

위암발증의 원인을 밝히기 위하여 설문조사를 통하여 강원도 화천군에 거주하는 주민들의 일반사항, 생활습관 및 영양섭취실태와, ELISA법으로 Helicobacter pylori 감염률을 조사하였다. 조사 대상자는 40∼69세까지의 지역주민 169명으로 남자 79명, 여자 90명이었으며 그 결과는 다음과 같다. 조사 대상자의 학력은 65.7%가 초등학교 이하였으며, 월수입은 60%가 50만원 이하였다. 대상자의 62.7%가 농업에 종사하였고 자녀수는 64.3%가 3∼5명이었으며 대상자의 34.5%가 흡연을 하고 있었고 68.4%가 음주를 한다고 대답하였다. 대상자의 전체 평균신장은 156.7㎝로 여자는 150.1㎝, 남자는 164.4㎝ 이었다. 평균체중은 61.1㎏으로 여자의 체중은 57㎏, 남자는 65.7㎏이었으며 BMI는 전체 평균 25.5%로 여자는 24.8%, 남자는 20.1%이었다. Helicobacter pylori의 감염률은 전체 조사대상자의 66.3%이었으며, 여자의 67.7%, 남자의 64.6%가 감염되었고 연령별로는 40대의 70%, 50대의 62.2%, 60대의 69.4%가 각각 감염된 것으로 나타났다. 일상 생활 요인에 따른 Helicobacter pylori의 감염률은 흡연의 정도가 심하고 학력이 낮으며 월수입이 낮을수록 높은 경향을 보였다. Helicobacter pylori의 감염여부에 따라 감염자와 비감염자의 영양섭취량을 조사해 본 결과 비감염자는 감염자와 비교해서 에너지, 총단백질, 동물성 단백질, 칼슘, 비타민 C 섭취량이 높은 경향을 보였으며 철분과 niacin의 섭취량은 낮은 경향을 보였다. To examine the relationship between the casual infection of gastric cancer and lifestyle and nutritional status, we surveyed 169 persons, 90 females and 79 males, aged 40∼69 years from June 7 to June 14, 1997, in Whachon area, Kang-Won Do, Korea. For this purpose, we investigated Helicobacter pylori infection and identified the effect of sex, age, smoking, alcohol consumption, economic status, occupation, life-style and food intake on Helicobacter pylori infection. Helicobacter pylori status was evaluated using an enzyme-linked immunosorbant assay(ELISA) for anti-Helicobacter pylori immunoglobulin G(IgG). Helicobacter pylori infection was present in 66.3% of total subjects, namely, 67.7% of female and 64.6% of male and its prevalence increased with smoking, low education level and low monthly income. Energy, total protein, calcium and vitamin C intakes in the negative Helicobacter pylori infection group were higher than those in positive Helicobacter pylori infection group. However iron and niacin intakes were lower in the Helicobacter pylori negative group than in the positive group.

Alkylhalide가 Mouse의 LDH isozyme 분포에 미치는 영향 : Cellulose Acetate Electrophoresis Method

권미경,김영옥,박은주,이동화,이명미,이문희,이양자 曉星女子大學校 藥學大學 學生會 1988 曉星藥誌 Vol.4 No.-

The effect of Carbontetrachloride administration on Lactatedehydrogenase isozyme patterns were analyzed by cellulose acetate electrophoresis for the brain, heart, kidney, lung, liver and mouse muscle. Each other tissue was found to have a characteristic distribution of these isozymes. At normal condition, aerobic tissue such as brain, heart, kidney, and lung were found to have all five isozymes from LDH_1 to LDH_5, while anaerobic tissues such as liver and muscle were found to have superiorly LDH_5 The toxicity of Carbontetrachloride administration was most prominence in the liver, and lung toxicity was occured also.

A study on carbon emission based heterogeneous vehicle routing

Young-Jae Choi,Yong-Ju Kwon1,Dong-Ho Lee 대한산업공학회 2012 대한산업공학회 춘계학술대회논문집 Vol.2012 No.5

We consider the problem of determining a set of vehicle routes starting/ending at the depot while satisfying customer demands and vehicle capacities for a given heterogeneous fleet of vehicles. As an extension of the previous studies, this study considers carbon emission for the objective of minimizing the sum of variable operation costs and carbon emission cost/benefit. As an earlier study on carbon emission based heterogeneous vehicle routing, we develop a mixed integer programming model and suggest two types of meta-heuristics, simulated annealing and tabu search, due to the complexity of the problem. Computational experiments were done on the benchmark instances with certain modifications, and the results are reported.

體型의 肥滿過度와 人性의 相關性 硏究

權永玉,元周淵 忠南大學校體育科學硏究所 1985 體育科學硏究誌 Vol.3 No.1

This study was performed to see whether the extent of body thickness show the correlation with personality, for this study, 121 Chung Nam National University woman students were randomly selected. The results were summarized as follows. 1. Woman students generally have the good personality in daily life, but have little planing performance and practice. 2. There is significant relationship between the positive tendency in personality and a sense of responsibility, and no significant relationship between the positive tendency in personality and a sense of responsibility, and no significant relationship between the positive tendency and an attitude of composure, readiness, planing performance, the extent of social activities in campus. 3. There is no significant relationship between the growth of thickness of human body and the positive tendency, a sense of responsibility, and attitude of composure and readiness. 4. The corpulent body type in volumn show the more affirmative reaction in personality than selender body type.

國際化와 企業稅制에 관한 考察

권선주,송영식 昌原大學校 産業經濟硏究所 1996 産經硏究 Vol.13 No.-