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임규찬,박윤서,배성제,정철수,신인식,김복영 師範大學 體育硏究所 1994 서울大學校 體育硏究所論集 Vol.15 No.2
This study was conducted to investigate the biomechanical characteristics of the gait pattern in an amputee for the purpose of improving the proper gait posture and designing the prosthetic. The subjects were six males amputees and one normal person. The ground reaction force was measured using AMTI force platform. The conclusions were as follows; 1. In case of amputee group, the ground reaction force was revealed in specific figure according to position in which they used the prosthetic, whereas in case of normal person the ground reaction force was revealed in the figure of two humps in regard of vertical axis. 2. In case of amputee group, the ground reaction force in time between fight foot contact and left foot contact was deviated from a figure of rectangle, whereas in case of normal person the ground reaction force was revealed in the figure of rectangle. 3. In case of amputee group, the ground reaction force referred to both feet angle point of view was revealed in irregular figure, whereas in case of normal person the ground reaction force was revealed about 47。
멀리뛰기 발구름 동작시 아킬레스건각이 도약속도와 도약각도에 미치는 영향
김복영,배성제,신인식,정철수,임규찬 師範大學 體育硏究所 1992 서울大學校 體育硏究所論集 Vol.13 No.2
The purpose of this study was to investigate the effect of lower leg planting angle an on take-off motion of the long jump. The Achilles tendon angle defined as the angle between shank and calcaneus with projection to XY plane was introduced to interprete lower leg motion uring last foot touch for the flight phase of long jump. A typical high speed film analysis technique including DLT method was adapted to record and analyze total of nineteen long jumps performed by elite athletes at two different track and field events. The following were found that: 1. The relationship between touch-down velocity, take-off velocity, range of vertical velocity and flight length were significantly related each others as r=0.6383, 0.6395 respectively at t=0.01 level. 2. It was not possible to reveal the relationship between take-off angle and flight length. Due to highly consistent take-off angles shown between the long jumpers. 3. The angular displacement of the shank during the last foot contact just before flight phase was negatively related to the flight length(r= -0.6149). However, it was not possible to find the relationship between the aehilles tendon angle and flight length. 4. As the range of the body C.O.G lean angle increased the last step foot contact time significantly increased(r=0.8625). 5. The foot contact time of Korean elite long jumpers was somewhat longer than that shown by foreign Athletes. It is concluded that maintaining touch-down velocity during initial phase of foot touch and increasing take-off velocity would result optimal take-off angle and good record. Decrease in the angular displacement of the shank, foot contact duration, and the range of body C.O.G lean angle were found to be important to improve the flight length.
P117 : Epidemiologic analysis on usage patterns of cosmetic products in Korea: part II
( Chan Hee Nam ),( Mi Soo Choi ),( Ji Seok Kim ),( Jee Young Kim ),( Seungphil Hong ),( Byung Cheol Park ),( Ha Krim Kim ),( Taewon Lee ),( Kyu Bong Kim ),( Myung Hwa Kim ) 대한피부과학회 2014 대한피부과학회 학술발표대회집 Vol.66 No.2
Background: Ingredients of cosmetics are able to pass in variable amount across the skin and generate adverse effects at given level of systemic exposure. Recently, cosmetic products are widely used even in adolescents and babies and the type and prevalence of cosmetic products for men are increasing prominently. Objectives: A database was created with person-oriented information regarding demographics of consumers and usage patterns for 72 kinds of cosmetics. Methods: We analyzed data from the online survey carried out 5 cities and 18,000 adults and adolescents comprising 908 males and 892 females ranged from 15 to 59 years completed the digital questionnaire. Results: - The average number of the cosmetic products which the participants use was 27.4 in women and 13.3 in men. The most commonly used products in men were shampoo, facial moisturizer and body cleanser. The use of base makeup and color makeup products of male respondents (21.7% and 32.3%, respectively) was reported to be quite higher than that of the past survey in other countries (0.5%). The average number of cosmetics for babies is 0.2 and the most commonly used products are lotion, shampoo and body cleanser. The teenagers use the average 24.1 cosmetic products and the commonly used ones in order are shampoo, lotion and hand cream. Conclusion: Our study provides valuable information on the usage pattern and exposure data of cosmetic products especially, in babies, teenagers and men
TBTO의 노출에 따른 참굴, Crassostrea gigas의 hemolymph내 무기성분 및 효소활성의 변화
조규석,민은영,지정훈,김재원,안철민,강주찬 한국어병학회 2001 한국어병학회지 Vol.14 No.2
본 연구는 20일 동안 TBTO 노출에 의한 참굴의 생존율 및 hemolymph 내의 무기성분과 효소활성의 변동을 조사하였다. TBTO 노출에 의한 참굴의 생존율은 실험 20일 동안 10㎍/L이하의 농도에서 90%이상을 나타냈다. 그러나 참굴의 생존율은 TBT농도가 증가함에 따라 감소하기 시작하여 실험 10일째 TBT농도 80㎍/L이상, 실험 20일째는 50㎍/L이상의 농도에서 유의한 감소가 관찰되었고, 100㎍/L에서는 실험 16일째 전 개체가 사망하였다. 참굴의 hemolymph의 calcium 농도는 10일째 대조구를 포함한 TBTO 5∼10㎍/L 농도에서 유사한 값을 나타냈으나 50㎍/L 이상의 TBTO 농도에서는 급격히 증가하여 대조구에 비해 유의한 증가가 관찰되었다. 또한 20일째 calcium 농도는 10일째 보다 전반적으로 증가하였으며, 대조구와 비교하여 20일㎍/L 이상의 농도에서 유의한 증가를 나타냈다. GPT활성은 실험 전 기간을 통해 모든 농도구에서 뚜렷한 변화를 보이지 않았다. 그러나 GOT는 실험 10일째 이상의 20㎍/L이상의 농도에서 유의한 증가를 나타냈다. The purpose of this study is to find out the effects of various bis(tri-n-butyltin)oxide (TBTO) on changes of inorganic matter and enzyme activity in the hemolymph of Pacific Oyster, Crassostrea gigas. Oyster were exposed to 5,10,20,50,80and 100㎍/L of TBTO for 20 days. Survival rate of the oyster wass significantly affected by ≥80㎍/L TBTO concentration at 10 days, while the diminution of survival was found at 20 days with a lower concentration of ≥50㎍/L TBTO. Calcium concentration in the hemolymph increased significantly after 20 days at the TBTO concentration 20 ㎍/L. However no change of magnesium and inorganic phosphate in the hemolymph was showed. A significant increment of GOT activities in the hemolymph was observed after 20 days at more than 20㎍/L TBTO concentraion, without typical changes of GPT activities. These results indicate that oysters can be affected by TBTO in terms of calcium concentration and GOT activity in the hemolymph when they were exposed to the TBTO concentration 20㎍/L.
동자개 (Pseudobagrus fulvidraco) 치어의 생존 및 성장에 미치는 Parathion의 영향
조규석 ( Kyu Seok Cho ),박종호 ( Jong Ho Park ),지정훈 ( Jung Hun Jee ),강주찬 ( Ju Chan Kang ) 한국수산과학회 2004 한국수산과학회지 Vol.37 No.5
N/A The toxic impact of parathion on bagrid catfish (Pseudobagrus firlvidraco) juvenile was examined 96 hr LC_(50) value of parathion estimated as 1.90 mg/L. Chronically, bagrid catfish were exposed for 30 days to concentrations of parathion, i.e. 63, 95, 190 and 380 ㎍/L, representing 3.3, 5.0, 10.0 and 20.0% of the 96 hr LC_(50). Survival rate was significantly affected by the concentration over 63 ㎍/L after 10 days. Growth rate, specific growth rate (SGR) and feed efficiency were reduced in time as concentration dependent manner. Growth rates of the exposed groups were significantly reduced as 28.06-60.63% to the control fish, SGR was decresed as 1.50-4.72% and feed efficiency was declined as 6.10-11.90%. It can be concluded that if P. fulvidraco is chronically exposed to parathion over 63 ㎍/L concentration, the physiological damages might affect growth factors of the fish.
Gowoon Yang,Jee Suk Chang,Kyung Hwan Shin,Jin Ho Kim,Won Park,Haeyoung Kim,Kyubo Kim,Ik Jae Lee,Won Sup Yoon,Jihye Cha,Kyu-Chan Lee,Jin Hee Kim,Jin Hwa Choi,Sung-Ja Ahn,Boram Ha,Sun Young Lee,Dong Soo 대한방사선종양학회 2020 Radiation Oncology Journal Vol.38 No.4
Purpose: The details of breast reconstruction and radiation therapy (RT) vary between institutions; therefore, we sought to investigate the practice patterns of radiation oncologists who specialize in breast cancer. Materials and Methods: We identified the practice patterns and inter-hospital variations from a multi-center cohort of women with breast cancer who underwent post-mastectomy RT (PMRT) to the reconstructed breast at 16 institutions between 2015 and 2016. The institutions were requested to contour the target volume and produce RT plans for one representative case with five different clinical scenarios and answer questionnaires which elicited infrastructural information. We assessed the inter-institutional variations in RT in terms of the target, normal organ delineation, and dose-volume histograms. Results: Three hundred fourteen patients were included; 99% of them underwent immediate reconstruction. The most irradiated material was tissue expander (36.9%) followed by transverse rectus abdominis musculocutaneous flap (23.9%) and silicone implant (12.1%). In prosthetic-based reconstruction with tissue expander, most patients received PMRT following partial deflation. Conventional fractionation and hypofractionation RT were used in 66.6% and 33.4% patients, respectively (commonest: 40.05 Gy in 15 fractions [17.5%]). Furthermore, 15.6% of the patients received boost RT and 53.5% were treated with bolus. Overall, 15 physicians responded to the questionnaires and six submitted their contours and RT plans. There was a significant variability in target delineations and RT plans between physicians, and between clinical scenarios. Conclusion: Adjuvant RT following post-mastectomy reconstruction has become a common practice in Korea. The details vary significantly between institutions, which highlights an urgent need for standard protocol in this clinical setting.
수치해석을 통한 부유성 위험유해물질의 확산특성 연구 및 예측모델 개발
고민규(Min Kyu Ko),정찬호(Chan Ho Jeong),박지민(Jee Min Park),이문진(Moonjin Lee),이성혁(Seong Hyuk Lee) 대한설비공학회 2018 대한설비공학회 학술발표대회논문집 Vol.2018 No.6
This study aimed to numerically investigate the propagation characteristics of floating hazardous noxious substances (HNS) and development of predicted model. ANSYS FLUENT(V. 17.2) was used for the calculations based on the RANS (Reynolds-Averaged Navier-Stokes) model together with the standard k-ε model. We also calculated the scalar transport equation for estimating the spatial and transient behaviors of HNS. Three key parameters such as the width of HNS layer, HNS concentration on the seawater, and propagation velocity were used to analyze the propagation characteristics of HNS. As the results, the lower the density, the wider the HNS layer. The HNS floating on the sea surface is pushed by the newly spilled fluid and spreads in a direction perpendicular to the ocean current. Therefore, the smaller the density, the larger the buoyancy acts on the HNS and the wider HNS layer is formed. Also, as the current velocity increases, transport by advection becomes active and the width of HNS layer decreases. The propagation velocity is linearly proportional to about 60 % of the ocean current velocity. The HNS concentration on the seawater is closely related to the width of HNS layer. As the width of HNS layer wider, the concentration become lower. In the preceding results, the greater the density, the smaller the width of the layer. At this time, the HNS concentration on the seawater increases because the HNS floating on the sea surface becomes more dense. As the current velocity increases, the propagation velocity increases and the width of HNS layer decreases. The HNS concentration tends to decrease due to these two effects. Finally, we developed the predicted models from the CFD results by using the Kriging model. In order to evaluate the accuracy of the prediction model, the numerical analysis results and the predicted values were compared and showed a low error rate of less than 3%.