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원영두,송채훈,조완주 朝鮮大學校 스포츠科學硏究所 2004 스포츠科學硏究 Vol.15 No.-
This study examines the physical fitness of each factor needed by working men, seeks to improve their physical strength by age and the degree of obesity, prevent several diseases due to the lack of exercise in advance, improve their service efficiency, enjoy efficient leisure activities and develop exercise programs for diagnosing physical strength and improving health. It calculated the mean and standard deviation by age and obesity (BMI) using statistical program SPSS 11.0 with 702 working men and obtained the following conclusions from post-test using one-way ANOVA and scheffe for differential test of the mean between groups. 1. In compahson of physical fitness factors by age, the group below 29 years old showed higher physical fitness level than other age groups in muscular strength, muscular endurance, flexibility, equilibrium, agility, power, whole body reaction and cardiopulmonary endurance and in comparison between groups by age, there was statistically significant difference at all physical fitness factors as p<.001. 2. In comparison of physical fitness factors by obesity, underweight group showed higher physical fitness level at muscular endurance, agility, equilibrium and flexibility factors, normal weight group showed higher physical fitness at power and whole body reaction factors and obesity group showed higher physical fitness at muscular strength factor. In addition, as a result of comparing physical fitness factors among groups by obesity, there was statistically significant difference at muscular strength, agility, Power, flexibility and cardiopulmonary factors as p<-05.
우리나라 남부지역 화강암질 삼림토양의 SEM 과 TEM 에 의한 관찰
조희두(Hi Doo Cho),안기완(Ki Wan An) 한국산림과학회 2001 한국산림과학회지 Vol.90 No.5
To understand the weathering processes of the soil by submicroscopic method is very important to realize the properties of the soils. In this study soil formation processes show every steps to the changes in chemical and mechanical properties and the submicroscopic characteristics of soil weathering on the profiles of forest soils derived from granite in southern part of Korea. Fecal pellets(SEM) are given a full detail of the positive activities of the forest soil animals; mainly invertebrates in the O horizon and the E horizon. External shapes of fecal pellets have been divided into five groups : spherical, ellipsoidal, cylindrical, platy and threadlike. But doughnutlike form of fecal pellets is observed in this study. The soluble and suspended materials in the soils move downwards by percolation from the A horizon to the B or the BC horizons, and result in the illuviation cutans(SEM) on the ped surface of the lower horizon and deposited stack of kaolinite. Illuviated cutans are deposited on the ped surface even in the depth of 312cm in the BC horizon as well as the Bt horizon and comprise of fine silt, coarse clay and fine clay. A lot of halloysites are observed on the cutan surface. Halloysite formation from feldspars has been well known but a lot of hallyosite formation are observed in this study. The formation were predicted by Jackson(1962), inferred by Wada and Kakuto(1983a, b) and proved evidently by Cho and Mermut(1992a, b). This also suggests that halloysites in the soils derived from granite are formed a lot from ferruginous chlorites. The release of Fe from the chlorite structure are significant pedogenic processes and newly formed Fe oxides imparted a red color to the soils. The iron oxides particles, which are ejected and recrystalized, aggregate thickly on the edge of the ferruginous chlorites, and this indicates the release of structural Fe from weathered chlorites. Hematites and goethites are frequent in the fine clay in this soils.
Cho, Doo-Ho,Woo, Seung-Wan,Chang, Yoon-Suk,Choi, Jae-Boong,Kim, Young-Jin,Jhung, Myung-Jo,Choi, Young-Hwan 대한기계학회 2010 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.24 No.3
This paper is to report enhancement of engineering J estimation for semi-elliptical surface cracks under tensile load. Firstly, limitation of the sole solution suggested by Zahoor is shown for reliable structural integrity assessment of thin-walled nuclear pipes. An improved solution is then developed based on extensive 3D FE analyses employing deformation plasticity theory for typical nuclear piping materials. It takes over the structure of the existing solution but provides new tabulated plastic influence functions to cover a wide range of pipe geometry and crack shape. Furthermore, to facilitate easy prediction of the plastic influence function, an alternative simple equation is also developed by using a statistical response surface method. The proposed $H_1$ values can be used for elastic-plastic fracture analyses of thin-walled pipes with a circumferential surface crack subjected to tensile loading.
리기다소나무조림지의 벌채수준 및 시료 채취시기에 따른 토양수내 이온농도 변화
조희두,오광인,안기완,김춘식 한국임학회 1999 한국산림과학회지 Vol.88 No.4
The concentrations of some ions (NO₃^-, Ca^(2+), Mg^(2+), NH₄^+) in soil solution collected by zero tension lysimeter in mature Pinus rigida plantations in Goksung, Jeonranam-do were measured at two soil depths (10㎝ and 30㎝) following various levels of cutting intensity treatment (uncut, 6m×5m, 10m×50m, 20m×50m strip crearcutting) three times (July 6. July 30, and August 4) between June 20 and August 4 1998. The ion concentrations in the soil solution were significantly different among sampling times, while the concentrations were not different among cutting levels or sampling depths. The ion concentrations in the soil solution decreased in the order of NO₃^-$gt;Ca^(2+)$gt;Mg^(2+)$gt;NH₄^+ and the mean concentration was 3.60㎎/L for NO₃^-, 1.7㎎/L for C^(2+)+, 0.5㎎/L for Mg^(2+), and 0.04㎎/L for NH₄^+ respectively. These ion concentrations except for NH₄^+ ion were negatively correlated with the volume of collected soil solutions (r=-0.31∼-0.41). The results suggest that the change of nutrient concentrations in the soil solution collected from the P. rigida plantations was related to the temporal input patterns of precipitation rather than the cutting intensity.
Cho, Hye-Kyung,Lee, Na-Yong,Lee, Hyun-Ju,Kim, Hae-Soon,Seo, Jeong-Wan,Hong, Young-Mi,Lee, Seung-Joo,Lee, Sun-Wha,Cheon, Doo-Sung,Hong, Ji-Young,Kang, Byung-Hak,Kim, Jong-Hyun,Kim, Kyung-Hyo The Korean Pediatric Society 2010 Clinical and Experimental Pediatrics (CEP) Vol.53 No.5
Purpose: Hand-foot-mouth disease (HFMD) is a common viral illness in children, which is usually mild and self-limiting. However, in recent epidemics of HFMD in Asia, enterovirus 71 (EV71) has been recognized as a causative agent with severe neurological symptoms with or without cardiopulmonary involvement. HFMD was epidemic in Korea in the spring of 2009. Severe cases with complications including death have been reported. The clinical characteristics in children with neurologic manifestations of EV71 were studied in Ewha Womans University Mokdong Hospital. Methods: Examinations for EV71 were performed from the stools, respiratory secretion or CSF of children who presented neurologic symptoms associated with HFMD by realtime PCR. Clinical and radiologic data of the patients were collected and analyzed. Results: EV71 was isolated from the stool of 16 patients but not from respiratory secretion or CSF. Among the 16 patients, meningitis (n=10) was the most common manifestation, followed by Guillain-Barre syndrome (n=3), meningoencephalitis (n=2), poliomyelitis-like paralytic disease (n=1), and myoclonus (n=1). Gene analysis showed that most of them were caused by EV71 subgenotype C4a, which was prevalent in China in 2008. Conclusion: Because EV71 causes severe complications and death in children, a surveillance system to predict upcoming outbreaks should be established and maintained and adequate public health measures are needed to control disease.
두록과 교잡돈(두록×재래돼지)의 도체 및 육질 특성과 지방산 조성 비교
김두완(Doo-Wan Kim),김기현(Ki-Hyun Kim),홍준기(Joon-Ki Hong),조규호(Kyu-Ho Cho),사수진(Soo-Jin Sa),김용민(Young-Min Kim),박준철(Jun-Cheol Park),설국환(Kuk-Hwan Seol) 충남대학교 농업과학연구소 2014 농업과학연구 Vol.41 No.4
본 연구는 우리나라 재래돼지의 고유 특성을 살린 우수한 품종을 개발하기 위하여 수행하였으며, 도체특성은 DK1이, 육질특성과 지방산조성은 DK2가 두록과 비교하여 차이가 없거나 우수한 것으로 나타나 재래돼지를 활용한 우수한 육질의 돼지 품종 개발이 가능할 것으로 사료된다. This study was conducted to develop new crossbred pig using Korean native pig and Duroc. Fifteen pigs of pure Duroc (D) and 26 crossbred gilts (15 of DK1 and 11 of DK2) were reared until 195 ± 5 days old, then slaughtered at local slaughterhouse. Pork loin was gathered and vacuum packed from left carcass after 24 h of slaughter to analyze meat quality traits, such as color, pH, water holding capacity (WHC), cooking loss and shear force (SF), and free fatty acid composition. Live weight and carcass weight of Duroc and DK1 were 119.1±8.7 / 82.91±6.1kg and 116.3±6.3 / 80.91±4.4 kg, respectively, and it was significantly higher than those of DK2 (104.7±8.4 / 71.36±5.7 kg) (p<0.05).There was no significant difference in proximate composition between animal groups, however DK2 showed significantly lower shear force (SF) and higher water holding capacity (WHC) than other groups (p<0.05). The redness of DK2 also showed significantly higher than Duroc (p<0.05), however there was no significant difference in lightness and yellowness (p>0.05). DK1 showed the highest monounsaturated fatty acids (MUFAs) contents of 51.45±2.0% and DK2 showed the highest polyunsaturated fatty acids (PUFAs) contents of 8.98±1.4%, however there was no significantly difference in PUFA/SFA ratio between pig groups (p>0.05). Duroc and DK2 contain significantly higher amount of linoleic (7.99±1.2 and 8.11±1.3%, respectively) and linolenic acid (0.43±0.1 and 0.44±0.1%, respectively) than DK1, and DK1 contains significantly higher amount of oleic acid (47.32±1.8%) than others (p<0.05).
건강검진자의 혈청 Rheumatoid Factor 양성률과 간염바이러스 감염의 관계에 대한 연구
엄완식(Wan Sik Uhm),조재근(Jae Kun Cho),정두련(Doo Ryeon Chung),최승원(Seung Won Choi),이무송(Moo Song Lee),유빈(Bin Yoo),문희범(Hee Bom Moon) 대한내과학회 1996 대한내과학회지 Vol.50 No.4
N/A Objectives: To estimate the prevalence of rheumatoid factor(BF) positivity in adult Korean population and to investigate the association between viral hepatitis infection and rheumatoid factor positivity. Methods: The database from 21,907 subjects who visited general health screening center of Asan Medical Center during 1 year's period were surveyed. RF was tested using a commercial latex test kit(RapiTex® RF Test; Behringwerke). Results : 1) The prevalence of I4F was 2.9%(male 3.1%, female 2.7%) and increased along with the higher age groups. 2) The prevalence of HF in HBsAg(+) subjects was higher(13.3%) than that of RF in HBsAg(-) subjects(2.2%). 3) The prevalence of RF in anti-HCV(+) subjects was higher(6.1%) than that of BF in anti-HCV(-) subjects(2.8%). 4) HBsAg positivity was highly associated the presence of RF than age, anti-HCV, or abnormnl AST/ALT. Conclusion : The prevalence of RF in healthy Korean adults can be estimated as 3% and shows high association with hepatitis B and C virus infection.