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송채훈,임효택,정명수 한국스포츠리서치 2003 한국 스포츠 리서치 Vol.14 No.4
This study aims to examine the relationship among the types of leisure activities of the aged, their satisfaction with leisure, their concentration on leisure and their loneliness. The subject of this study is the aged over 65 years old residing in Jeollanamdo and Gwangju by random sampling and total 520 subjects of 238 men (43.3%) and 282 women (51.3%) are used for the final analysis. The examination method accepts self-test recording and questionnaire to analyze the actual conditions and satisfaction of leisure through direct participation in the leisure program conducted by educational agencies for the aged and the statistical methods used for data analysis include SPSS 10.0 for Windows, t-test and one-way ANOVA. This study obtains the four conclusions through the above methods and procedure as follows: First, it is found that the types of leisure activities according to the demographical characteristics of the aged are sports, health activities, hobby and cultural activities, amusement and social activities, there is no statistical difference according to the presence of spouse, but there are difference in the types of leisure activities enjoyed by the aged according to general characteristics. Second, it is known that there are statistically significant differences in the degree of subjective health, their satisfaction with pocket money and preparation for their old age and those who enjoy leisure activity show low loneliness, feel a considerable satisfaction with leisure and concentrate on the leisure activities.
이명수,허화정,김병기,류훈,정현택 한국정신과학학회 1998 韓國精神科學學會誌 Vol.2 No.2
심장박동간격은 최근 교감신경과 부교감신경의 안정을 알아보는 척도로 쓰이고 있다. 본 연구는 4~12개월 천도선법 기수련을 행한 20대의 20명의 기수련자와 동일 연령층의 20명의 일반인을 대상으로 하여 1시간 동안 천도선법을 수행하게 하여 전, 참선, 후의 심장박동을 생리 기록계로 측정을 하여 빠른 퓨리에 변환 (FFT)을 통하여 심장박동간격을 조사하였다. 그 결과 자율신경제의 안정척도인 저주파수 적분 값과 고주파수 적분 값의 비(LF/HF)가 수련전과 수련 중에서 천도선법 기수련생들의 값이 일반인과 비교하여 통계적으로 유의한 차이가 났으며 (p<0. 01) 특히 두 그룹 모두 HF 의 값이 유의하게 변화하는 것을 보았을 때 천도선법 기수련이 부교감신경의 활동을 조절하여 자율신경계를 안정화 시킨다는 것을 보여주었다. The effects of ChunDoSunBup (CDSB) Qi-training on the power spectrum of heart rate variability were studied in 20 healthy subjects and 20 CDSB Qi-trainee (subjects with CDSB Qi-training for 4-12 months) Continuous ECG signals were recorded during 1) 10 min of rest in sitting position, 2) 1 hour of CDSB Qi-training , 3) 10 min of post-training. Fast Fourier transformation was used to determine the power spectrum of heart rate variability While CDSB Qi-training, there were significant decrease in the ratio of low to high frequency power spectrum. And value of pre and mild-training in CDSB Qi-trainees were lower than that of control subjects There was a significant changes in high frequency power of both group, but net in low frequency These results suggest that CDSB Qi-training may stabilize autonomic nervous system by modulate parasympathetic nervous system.
Jeong, Myeong Hoon,Sanger, Amit,Kang, Sung Bum,Jung, Yeon Soo,Oh, In Seon,Yoo, Jung Woo,Kim, Gun Ho,Choi, Kyoung Jin The Royal Society of Chemistry 2018 Journal of Materials Chemistry A Vol.6 No.32
<P>Poly(3,4-ethylenedioxythiophene)-poly(styrenesulfonate) (PEDOT:PSS) is one of the most promising candidate materials for flexible thermoelectric generators. We report changes in morphological, electrical, and thermoelectric properties of strained PEDOT:PSS thin films treated with solvents, including H2SO4, MeOH, and polyethylene glycol (PEG). The stretching creates macroscopic cracks on the thin film surface and microscopically change the domain structure from a dense network to an isolated state. With increasing strain, short, fine cracks at small strains propagate into long, thick cracks. The H2SO4 treatment makes PEDOT:PSS very brittle even at ∼5% strain, whereas PEG improves the stretchability of PEDOT:PSS up to 50%. Stretching reduces the electrical conductivity of solvent-treated samples, which agrees well with the decreased hole concentration of strained PEDOT:PSS, as confirmed by ultraviolet photoemission spectroscopy. In contrast, the Seebeck coefficient (<I>S</I>) of the strained PEDOT:PSS thin films increases. The PEG sample shows the highest <I>S</I>, and thus exhibits an enhanced power factor (PF) with strain, while other solvent treatments reduce PF. To the best of our knowledge, this is the first report on the strain-induced enhancement of <I>S</I> and thermoelectric PF of PEDOT:PSS.</P>
Green Manufacturing Process for Helical Pinion Gear Using Cold Extrusion Process
Jeong, Myeong-Sik,Lee, Sang-Kon,Yun, Jeong-Hwan,Sung, Ji Hyun,Kim, Da Hye,Lee, Shinok,Choi, Tae-Hoon Korean Society for Precision Engineering 2013 International Journal of Precision Engineering and Vol.14 No.6
In this research, a cold extrusion process that can replace conventional machining process is developed for sustainable production. The cold extrusion method requires an analytical design process to assure desired dimensional accuracy of the final product. Therefore, the design must consider the material flow during the process in order to avoid product defects such as folding and underfilling. The forming load and material flow were analyzed using a commercial finite element code, DEFORM3D. To improve the dimensional accuracy, the shape of die and initial billet were designed using minimum distance analysis via FE simulation. Also the developed process included ejection for improving dimensional accuracy, and it was verified by a gear accuracy test. Isothermal annealing and spheroidizing were applied for increasing the formability of high strength workpiece. Finally a helical pinion gear was manufactured using the developed process and the product was compared to the simulation results. In conclusion, the developed process is a scrap reducing and energy saving method for manufacturing extrusion product with high dimensional accuracy.
유럽감초와 만주감초의 교배육종을 통한 감초 신품종 ‘다감’ 특성
Jeong Hoon Lee,Chun Geon Park,Jin Tae Jeong,Yun Ji Lee,Geum Soog Kim,Jae Ki Chang,Myeong Seok Kim,Kwang Jae Lee 한국약용작물학회 2017 한국약용작물학술대회 발표집 Vol.2017 No.05
Background : Licorice has been used as a source of medicine and a food material in East-Asia. Recently, demand for licorice increased in market due to a growing interest in health. Thus we conducted breeding research to solve the problems associated with domestically cultivated licorice such as low productivity and low glycyrrhizin content. Methods and Results : We crossed European licorice (G. glabra L.; female parent) and Chinese licorice (G. uralensis Fisch; male parent) in the greenhouse in May 2007. In September 2007, crossed and germinated seeds were retrieved and sown in the greenhouse. In June 2008, stolons were separated from the F1 licorice seedlings and cultivated, resulting in 32 clonal lines of interspecific hybrids. Among them we selected good lines and then conducted the replicated yield trials (RYT) in 2012-2013 and local adaptability test (LAT) in 2014-2015. The results, GLYES9 showed that was elect of stem, oblong of leaf shape, red-brown of root color. Glycyrrhizin conten of GLYES9 (3.0%) was higher than G. uralensis (1.9%) at four regions from 2014 to 2015. GLYES9 was less than 10% in the desease of brown spot (G. uralensis was more than 30%). The root yield of GLYES9 was 4.31 ton per hectare, which was increased 193% compared with a check variety of G. uralensis. Therfore, we named GLYES9 as new cultivar ‘Dagam’. Conclusion : Depending on the above results, we have developed a new licorice cultivar ‘Dagam’ by the medicinal crop breeding team of National Institute of Horticulture and Herbal Science, RDA, in 2015. It showed brown spot disease resistant, high-glycyrrhizn content and high-yielding than colleted Glycyrrhiza spp.
이정훈(Jeong Hoon Lee),오명원(Myeong Won Oh),서경혜(Kyung Hye Seo),박춘근(Chun Geun Park),정진태(Jin Tae Jeong),한종원(Jong Won Han),마경호(Kyung Ho Ma),장재기(Jae Ki Chang) 한국약용작물학회 2021 한국약용작물학회지 Vol.29 No.2
Background: Licorice is an important medicinal plant, but climate conditions can hinder seed production. Because it is difficult to produce the seeds, Korea mostly depends on the imported product. In addition, when grown domestically, the standard ingredients do not comply with those of the Korean Pharmacopoeia (glycyrrhizin 2.5% and liquritigenin 0.7%). Therefore, it is necessary to develop licorice variety suitable for the domestic environment. Methods and Results: A new interspecific hybrid cultivar designated ‘Dagam’, was developed from Glycyrrhiza glabra × G. uralensis (G. korshinskyi Grig.) and is regarded as a high-yielding and high-quality licorice by Rural Development Administration. On average the yield for ‘Dagam’ was recorded 431.5 ㎏/10a. The cultivar displayed strong brown spot disease and lodging resistance. Additionally, the glycyrrhizin and liquiritigenin contents of ‘Dagam’ (3.0 and 0.7%, respectively) met, the Korean Pharmacopoeia standard. This cultivar can widely adapt to most cultivation areas in Korea except Jejudo, Gangwondo, and the mountain-alpine regions. Furthermore, ‘Dagam’ was not showed any cytotoxicity and high cell viability compared to ‘G. uralensis’. Conclusions: The interspecific hybrid cultivar ‘Dagam’ will contribute to the stability of domestic cultivation of licorice in Korea.