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골수암유래 암세포주 KHOS/NP와 MG-63의 성장에 미치는 마늘의 암세포 독성효과
이정석,임성남,오명숙,지은정 全北大學校 齒醫學硏究所 1993 전북치대논문집 Vol.11 No.1
Most anticancer drugs so far used have brought many side effects to the host, which is inevitable since they can not specifically distinguish between cancer cells and rapidly dividing normal cells. Therefore, it is very important to develope a chemopreventive agent proven for a long period of time not to toxic to normal cells. Since garlic has been attracted interests from many areas of cancer researchers as a potent anticancer agent, attempts were made to see the direct cytotoxic effect of garlic to human osteosarcoma cell lines. The present study was designed to investigate the effect of garlic on the two cell lines of rapidly growing osteosarcoma with comparable doubling time of 20 hours, namely KHOS/NP and MG-63. Four different garlic preparations commnly used in the Koreans, that is, raw and heated garlic dissolved in distilled water, raw and heated garlic dissolved in saline were compared in thier cytotoxic effect to the KHOS/NP and MG-63. The results obtained were as follows. 1. Raw garlic dissoved in distilled water showed the best cytotoxic effect among four different preparations of garlic used in this study. 2. The cytotoxic effect of garlic to the osteosarcoma was different, to the cell lines showing mostly more effective to KHOS/NP than to MG-63. 3. To KHOS/NP, the cytotoxic effect of garlic was markedly increased with concentrations but not with incubated time. 4. To MG-63, the cytotoxic effect of garlic w3s increased both with concentrations and incubated time. 5. The difference of inhibitory action of garlic between KHOS/NP and MG-63 was marked when heated garlic in saline was treated at high concentration(0.1875g% ) for 48 hours.
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李明淑 朝鮮大學校 1977 綜合論文集 Vol.1977 No.-
We know that marriage is very important matter for our life, but the effort to develop a marriage by scientific method is very weak so far. In Korea, the study on the marriage has been carried out partially, so the views of marriage for young people has come into question in our society which has been influenced by the countries in Europe and America these days. In this research, it is the purpose to give the right views of marriage for young people through the statistical comparative study on the views of marriage between high school students and college students. The difference between high school students and college students by the result of study is as follows: 1. In a way to get married, both high school students and college students want a compromising way of high stability through half free love and half matchmaker. For the age of women's marriage the views of high school students is one year younger than the views of college students. 2. In academic career of a spouse, college students want more higher one than high school students. Under the condition of choice of a spouse, college students are interested in spiritual matter, but high school students are more interested in material comport and physically strong. 3. In a way to select a spouse, high school students want to find one by, themselves, but college students want to find one through their parents or their friends. 4. Both high school students and college students do not want to live together with their parents after get married. In economical aspect, high school students want more women's job after get married than college students. 5. Both high school students and college students think that to make a love and to get married are different thing. In the purity problem, college students throw open more than high school students. 6. For the ideal coiple both high school students and college students want marriage life with friendship.
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李明熱,吳賢宇,崔承允,禹建錫 서울대학교농과대학농업개발연구소 1989 서울대농학연구지 Vol.14 No.1
In order to employ the honeybees (Apis mellifera) profitably as insect-pollinators, the factors governing their diurnal foraging activity, the patterns of diurnal flight activity at the hive entrance and the seasonal fluctuation of colony size were examined. The results obtained are summarized as follows. 1. There was a maximum flight activity at the hive entrance between 11h and 15h during the spring and fall but it was between 08h and 09h or 16h and 17h during the summer. This activity highly correlated with the solar energy(Mj/m²) during the spring and fall. 2. The brood area and colony weight developed to the maximum in early July but total number of flying bees at the hive entrance reached the peak early in May, and decreased in June but increased again late in July. 3. The higher the degree of flowering developed, the more active the foraging behavior. Though the degree of flowering was similar in different varieties, the foraging preference in the apple blossoms differed with varieties. 4. The amount of nectar per flower was variable with time hours, age of flowers and plant varieties. 5. The number of honeybees collecting only the nectar in the apple blossoms increased in the afternoon. Foraging behavior in the pear blossoms changed with the varieties and the numbers of honeybees collecting only the pollen (66%) or only the nectar (31%) did not change with time in the peach blossoms. 6. The diurnal foraging activities of honeybees on eight honey plants highly correlated with the solar energy but temperature, relative humidity and wind speed were not.
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박미숙,이명수,정영자,김혜정,문성록,김용규 한국스포츠심리학회 2003 한국스포츠심리학회지 Vol.14 No.3
본 연구는 스트레스 반응을 측정하는 스트레스 반응 척도 설문지(Symptoms of Stress: SOS)를 이용한 횡단적 연구로서 심신수련의 하나인 기수련이 스트레스 반응에 미치는 효과를 살펴보았다. 72명의 건강한 정상인과 180명의 기수련자를 대상으로 하여 조사하였으며, 기수련자들은 수련기간에 따라 초급군(1-4개월; 64명), 중급군(5-12개월; 50명), 고급군(1년 이상; 66명)로 나누었다. 실험결과 1년 이상 수련한 기수련자들이 말초혈관 증상군, 심폐 증상군, 중추신경계 증상군, 위장계증상군, 습관적 행동 형태군, 우울 증상군, 불안증상군등의 스트레스 반응 하위척도에서 대조군에 비해 통계적으로 유의하게 감소하였다. 전체 스트레스 값은 대조군에 비해 기수련자 집단이 아주 낮았으며 수련기간이 길수록 감소하였다. 이러한 결과는 기수련이 스트레스 중재와 스트레스 증상을 줄이는데 효과가 있음을 나타낸다. We examined the effects of Qi-training, one of Korean traditional psychosomatic training, on stress coping ability by cross-sectional investigation with inventory of symptoms of stress (SOS). Four types of groups- normal healthy (n-74), three groups of Qi-trainees (group primary level: subjects with Qi-training for 1-4months, n=64; middle level: 5-12 months, n=50; high level: more than 12 months, n=66) participated in this study, Qi-trainees with over 1 year training had significantly lower scores in all SOS subscales compared to controls. Total stress scores of Qi-trainee groups were substantially lower than controls and further reduction with larger training periods. These results suggest Qi-training is effective in stress management and decreasing symptoms of stress
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Effect of TiO<sub>2</sub> particle size and layer thickness on mesoscopic perovskite solar cells
Lee, Dong Geon,Kim, Min-cheol,Kim, Byeong Jo,Kim, Dong Hoe,Lee, Sang Myeong,Choi, Mansoo,Lee, Sangwook,Jung, Hyun Suk Elsevier 2019 APPLIED SURFACE SCIENCE - Vol.477 No.-
<P><B>Abstract</B></P> <P>Mesoporous TiO<SUB>2</SUB> (mp-TiO<SUB>2</SUB>) layers are commonly used as electron transport layers in perovskite solar cells, which help to extract electrons from the perovskite light-absorbing layer and transport them to the electrodes. We investigated the effects of the layer thickness of mp-TiO<SUB>2</SUB> and particle size of TiO<SUB>2</SUB> on photovoltaic properties, in terms of the surface area of the mp-layer and the interfacial areas of the TiO<SUB>2</SUB> nanoparticles in the mp-layer. Various mp-TiO<SUB>2</SUB> layers with thicknesses of 150, 250, and 400 nm and particle sizes of 25 nm and 41 nm were prepared to compare the photovoltaic properties of such layer-containing perovskite solar cells. Time-resolved photoluminescence decay and impedance studies showed that interfacial resistance as well as perovskite-to-TiO<SUB>2</SUB> charge injection are important factors affecting photovoltaic performance. The deterioration of the photovoltaic parameters with increasing TiO<SUB>2</SUB>/TiO<SUB>2</SUB> interfacial area also confirms that the interfacial series resistance that arises from these connections should be reduced to enhance the performance of mesoscopic perovskite solar cells.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Electron injection and transport properties of mesoporous layer containing TiO<SUB>2</SUB> nanoparticles are investigated. </LI> <LI> The photovoltaic properties are poor with small TiO<SUB>2</SUB> particles and thick mesoporous layers. </LI> <LI> This poor performance is due to the increase of the area of the TiO<SUB>2</SUB>/TiO<SUB>2</SUB> interface. </LI> <LI> The TiO<SUB>2</SUB>/TiO<SUB>2</SUB> interfacial resistance largely influences the photovoltaic parameters. </LI> </UL> </P>
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Optical design of ZnO-based antireflective layers for enhanced GaAs solar cell performance
Lee, Hye Jin,Lee, Jae Won,Kim, Hee Jun,Jung, Dae-Han,Lee, Ki-Suk,Kim, Sang Hyeon,Geum, Dae-myeong,Kim, Chang Zoo,Choi, Won Jun,Baik, Jeong Min The Royal Society of Chemistry 2016 Physical chemistry chemical physics Vol.18 No.4
<P>A series of hierarchical ZnO-based antireflection coatings with different nanostructures (nanowires and nanosheets) is prepared hydrothermally, followed by means of RF sputtering of MgF2 layers for coaxial nanostructures. Structural analysis showed that both ZnO had a highly preferred orientation along the < 0001 > direction with a highly crystalline MgF2 shell coated uniformly. However, a small amount of Al was present in nanosheets, originating from Al diffusion from the Al seed layer, resulting in an increase of the optical bandgap. Compared with the nanosheet-based antireflection coatings, the nanowire-based ones exhibited a significantly lower reflectance (similar to 2%) in ultraviolet and visible light wavelength regions. In particular, they showed perfect light absorption at wavelength less than approximately 400 nm. However, a GaAs single junction solar cell with nanosheet-based antireflection coatings showed the largest enhancement (43.9%) in power conversion efficiency. These results show that the increase of the optical bandgap of the nanosheets by the incorporation of Al atoms allows more photons enter the active region of the solar cell, improving the performance.</P>
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