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Kyeom Seon Do,Tae-hyeon Baek,Min Gu Kang,Sung Jin Choi,Gi Hwan Kang,Gwon-Jong Yu,이정철,명재민,Hee-eun Song 대한금속·재료학회 2014 METALS AND MATERIALS International Vol.20 No.3
A reduction in silicon material consumption in the photovoltaic industry is required for cost reduction. Using crystalline silicon wafers of less than 120 microns of thickness is a promising way for cost and materialreduction in the solar cell production. The standard thickness of crystalline silicon solar cells is currentlyaround 180 microns. If the wafers are thinner than 100 microns in the silicon solar cells, the amount of siliconwill be reduced by almost half, which should result in prominent cost reduction. With this aim, many groupshave worked with thin crystalline silicon wafers. However, most of them have studied with small size substrates. In this paper, we present the electrical characteristics for thin single crystalline silicon solar cells of 100and 115 μm thickness and 156×156 mm2area manufactured through a conventional process. We have achieved17.2% conversion efficiency with a 115 μm silicon substrate and 16.8% with a 100 μm substrate. This enablesthe commercialization of the thin crystalline silicon solar cells with high conversion efficiency. We also suggestissues to be solved in thin crystalline silicon solar cell manufacturing.
Korean Asthma Guideline 2014: Summary of Major Updates to the Korean Asthma Guideline 2014
( Deog Kyeom Kim ),( Yong Bum Park ),( Yeon Mok Oh ),( Ki Suck Jung ),( Ji Hong Yoo ),( Kwang Ha Yoo ),( Kwan Hyung Kim ) 대한결핵 및 호흡기학회 2016 Tuberculosis and Respiratory Diseases Vol.79 No.3
Asthma is a prevalent and serious health problem in Korea. Recently, the Korean Asthma Guideline has been updated by The Korean Academy of Tuberculosis and Respiratory Diseases (KATRD) in an effort to improve the clinical management of asthma. This guideline focuses on adult patients with asthma and aims to deliver up to date scientific evidence and recommendations to general physicians for the management of asthma. For this purpose, this guideline was updated following systematic review and meta-analysis of recent studies and adapting some points of international guidelines (Global Initiative for Asthma [GINA] report 2014, National Asthma Education and Prevention Program [NAEPP] 2007, British Thoracic Society [BTS/SIGN] asthma guideline 2012, and Canadian asthma guideline 2012). Updated issues include recommendations derived using the population, intervention, comparison, and outcomes (PICO) model, which produced 20 clinical questions on the management of asthma. It also covers a new definition of asthma, the importance of confirming various airflow limitations with spirometry, the epidemiology and the diagnostic flow of asthma in Korea, the importance and evidence for inhaled corticosteroids (ICS) and ICS/formoterol as a single maintenance and acute therapy in the stepwise management of asthma, assessment of severity of asthma and management of exacerbation, and an action plan to cope with exacerbation. This guideline includes clinical assessments, and treatment of asthma.chronic obstructive pulmonary disease overlap syndrome, management of asthma in specific conditions including severe asthma, elderly asthma, cough variant asthma, exercise-induced bronchial contraction, etc. The revised Korean Asthma Guideline is expected to be a useful resource in the management of asthma.
Vertebral osteophyte of pre-modern Korean skeletons from Joseon tombs
Deog Kyeom Kim,Myeung Ju Kim,Yi-Suk Kim,Chang Seok Oh,Dong Hoon Shin 대한해부학회 2012 Anatomy & Cell Biology Vol.45 No.4
Spinal osteophytic changes are known to be affected by differences in age, sex, population, and mechanical stress. We examined Joseon skeletons (n=87) to obtain vertebral osteophytosis data on a pre-modern Korean population. The mean osteophytic value (MOV) of vertebrae increased in the cervical-thoracic-lumbar order. More severe osteophytosis was found in the vertebrae (C5, T9, T10, and L4) farthest from the line of gravity, while the general pattern of vertebral osteophytosis appeared similar to those of previous reports on other skeletal series. More severe osteophytes were much more common in the males, possibly due to their engaging in more strenuous physical labor than that of females. We also observed MOV patterns seemingly unique to the Joseon people, and findings not typically reported in previous studies. Although a full explanation of the factors contributing to vertebral-osteophytic development in Joseon Koreans will require further studies, the present results are meaningful to anatomists and anthropologists interested in osteophytic patterns occurring in an East Asian population.
Sung Kyeom Kim,Rona Bae,Haeyoung Na,Jeong Hwa Song,Ho Jong Kang,Changhoo Chun 한국원예학회 2012 원예과학기술지 Vol.30 No.4
Three Korean-bred strawberry cultivars ‘Maehyang’, ‘Seolhyang’, and ‘Keumhyang’, and a Japanese cultivar ‘Tochiotome’ were grown in a greenhouse and their physicochemical characteristics were investigated. Fruit weight of ‘Seolhyang’ and ‘Keumhyang’ in the first and second fruit clusters were greater than those of other cultivars and that of ‘Tochiotome’ was the greatest in the fifth fruit cluster. Fruit firmness generally decreased at later fruit clusters, and was the lowest in ‘Seolhyang’. The sugars/organic acids ratios in the first and third fruit clusters of ‘Maehyang’ were 4.9 and 8.0, respectively, representing the highest values among all cultivars. The ascorbic acid content was the greatest in the second fruit cluster for ‘Seolhyang’, ‘Keumhyang’, and ‘Tochiotome’ cultivars and that of ‘Maehyang’ was the greatest at the third fruit cluster. The anthocyanin content was higher in later fruit clusters and was the highest in ‘Keumhyang’ overall. Results indicate that Korean cultivars bred for the plastic protected culture, which are intended for very early harvest, showed more desirable physical characteristics in the first and second fruit clusters, while the content of anthocyanin was greater in the fruits from later fruit clusters.
Sung Kyeom Kim,Ro Na Bae,Changhoo Chun 한국원예학회 2011 원예과학기술지 Vol.29 No.3
The net photosynthetic rate of ‘Seolhyang’ strawberry plants was measured daily for 7 days after treatment at three UV illumination dosages (0, 9.8, and 29.5 kJ · m?²). The net photosynthetic rates of the strawberry plants with 9.8 and 29.5 kJ · m?² UV light illumination decreased by 20.2 and 61.4%, respectively, at 7 days after UV light treatments. UV treatments with two illumination dosages (7.9 and 15.7 kJ · m?²) altered the phenolic compounds contents during the cultivation period when compared to those in the control fruits. The anthocyanin content with 7.9 kJ · m?² UV light illumination of ‘Seolhyang’ increased by 18.7% compared with those in control fruits at the 11 DAT. However, the anthocyanin content of ‘Maehyang’ was not significantly different among treatments during experiment period. The highest level of ellagic acid was found with 7.9 kJ · m?² UV light illumination in both cultivars at the 11 DAT. Our results showed that strawberries illuminated with UV light during cultivation period had higher bioactive compounds contents than control fruits. These results suggest that UV light treatments may be a useful non-chemical way of promoting strawberry fruits quality.