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만성요통 골프선수의 요부 안정화 운동프로그램이 균형능력과 근 활성도에 미치는 영향
장진욱(Jang, Jin-Uk),김재호(Kim, Jae-Ho),이상호(Lee, Sang-Ho) 한국체육과학회 2014 한국체육과학회지 Vol.23 No.2
This study was to evaluate the effects of a lumbar stabilization exercise on balance, muscular strength in golfers with chronic low back pain. Subjects were allocated to two groups: experimental group(n=11) and control group(n=11). Subjects in experimental group received a lumbar stabilization training during 30 minutes, with 3 session per week for 8 weeks, and Subjects in all groups received a conventional stretching exercise during 30 minutes, with 5 session per week for 8 weeks. All subjects were measured on static balance, trunk muscle activity in pre and post test. The result was that lumbar stabilization exercise group was significantly increased the static balance, trunk muscle activity after intervention. Lumbar stabilization exercise group was significantly improved the static balance, trunk muscle activity, more than control group. In conclusion, a lumbar stabilization exercise improved balance, trunk muscle activity in golfers with chronic low back pain.
최근 강수 자료를 이용한 범용토양유실공식의 강우침식능인자 정의에 관한 연구
김종건 ( Kim Jonggun ),장진욱 ( Jang Jin Uk ),성각규 ( Seong Gak Gyu ),차상선 ( Cha Sang Sun ),박윤식 ( Park Youn Shik ) 한국농공학회 2018 한국농공학회논문집 Vol.60 No.6
Universal Soil Loss Equation (USLE) has been widely used to estimate potential soil loss because USLE is a simple and reliable method. The rainfall erosivity factor (R factor) explains rainfall characteristics. R factors, cited in the Bulletin on the Survey of the Erosion of Topsoil of the Ministry of Environment in the Republic of Korea, are too outdated to represent current rainfall patterns in the Republic of Korea. Rainfall datasets at one minute intervals from 2013 to 2017 were collected from fifty rainfall gauge stations to update R factors considering current rainfall condition. The updated R factors in this study were compared to the previous R factors which were calculated using the data from 1973 to 1996. The coefficient of determination between the updated and the previous R factors shows 0.374, which means the correlation is not significant. Therefore, it was concluded that the previous R factors might not explain current rainfall conditions. The other remarkable result was that regression equations using annual rainfall data might be inappropriate to estimate reasonable R factors because the correlation between annual rainfall and the R factors was generally unsatisfy.
김종건 ( Jonggun Kim ),장진욱 ( Jin Uk Jang ),차상선 ( Sangsun Cha ),박윤식 ( Youn Shik Park ) 한국농공학회 2018 한국농공학회 학술대회초록집 Vol.2018 No.-
Universal Soil Loss Equation (USLE) has been widely used to estimate potential soil loss since USLE is a reliable and simple approach. The rainfall erosivity factor (USLE R factor) is to explain rainfall characteristics. USLE R factors, cited in the Bulletin on the Survey of the Erosion of Topsoil of the Ministry of Environment in the Republic of Korea in 2012, are too outdated to represent recent rainfall patterns in the South-Korea. Therefore rainfall datasets at one minute intervals from 2013 to 2017 were collected from fifty rainfall gauge stations to update USLE R factors considering current rainfall condition. The USLE R factors updated in this study were compared to the previous R factors which were computed using the data from 1973 to 1996. The coefficient of determination between the previous and the updated USLE R factors displays 0.374, which means the correlation is insignificant. Therefore it was concluded that the previous R factors are not appropriate to explain recent rainfall conditions. The other remarkable result was that regression equations using annual rainfall data are not appropriate to estimate reasonable USLE R factors because the correlation between annual rainfall and the R factors was generally unsatisfy.
한희수 ( Heui Soo Han ),이정식 ( Jung Sik Lee ),장진욱 ( Jin Uk Jang ),양남용 ( Nam Young Yang ) 대한지질공학회 2010 지질공학 Vol.20 No.2
강우시 침투량 산정을 위하여 일반적으로 기존의 침투능 산정식인 Horton 공식 및 Green-Ampt 공식으로 지반 내 침투능을 산정해 왔다. 하지만, 실제 강우로 인한 지반 침투는 연속적으로 침투가 이루어지므로, 이와 같은 불연속적인 침투량산정공식의 단점을 보완하고자 연속적인 침투능 산정공식을 새로이 유도하여, 침투능 및 침투량을 비교 분석하고자 하였다. 유도된 식 및 기존의 침투공식을 검증하기 위한 침투실험을 행하여 각 식의 결과들을 비교분석하였다. 함수비 혹은 포화도의 함수인 불포화투수계수는 직접적으로 침투능 및 침투량에 영향을 끼치므로, 새로이 유도된 식은 침투과정에 따른 불포화투수계수의 변화를 이용하여 보다 정확한 침투능 및 침투량을 산정하고자 하였으며, 침투로 인한 구조물의 안정 및 지하수 거동을 보다 정확히 해석하기 위한 것이다. To estimate the accumulated infiltration, Horton`s and Green-Ampt`s equations are usually applied. Because the real infiltration is penetrated into the soil continuously, to cover the problems of the conventional equations derived from the discontinuous infiltration system, new infiltration equation is derived from the concepts of continuous infiltration system. Furthermore, infiltration tests were done to compare the results from the conventional Horton`s and Green-Ampt`s equations and newly derived equation. Unsaturated permeability is the function of water content ratio or saturation degree, which affects directly to the infiltration capacity and accumulated infiltration. Therefore, the variation term of unsaturated permeability is inserted into the new equation to estimate the proper infiltration capacity and accumulated infiltration. It will make the more accurate analysis for the safety of structure and the behavior of groundwater.