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물리치료 전공대학생들의 진로선호도와 학습동기에 관한 연구
강준구,복원주,서유리,이도영,한동국,손경현,이경현,Kang, Jun-Gu,Bok, Won-Ju,Seo, You-Ri,Lee, Do-Young,Han, Dong-Guk,Son, Kyung-Hyun,Lee, Kyung-Hyun 대한물리치료과학회 2015 대한물리치료과학회지 Vol.22 No.2
Purpose : This study is to investigate on career preference after graduation and learning motivation of students majoring in physical therapy. Methods : This survey implement with 400 students majoring in physical therapy from 3 college and university in korea, jeonnam 394 of 400 attended this survey. The measured date were analysed by using repeated anova, frequency analysis, $x^2$-test, t-test. Results : The results of this study were as follows: Career preference showed significant difference between male and female in department of orthopedic physical therapy and showed significant difference all by workplace(general hospital, special hospital). Career preference didn't show significant difference by schol system(college, university) and showed significant difference by work place. Learning motivation(inner motivation) showed significant difference in male by gender. Learning motivation didn't show significant difference by school system.
BMP test를 통한 음폐수와 하수슬러지의 병합소화 특성 평가
이수영ㆍ윤영삼ㆍ강준구ㆍ김기헌ㆍ신선경(Su young LeeㆍYoung Sam YoonㆍJun Gu KangㆍKi Heon KimㆍSun Kyoung Shin) 유기성자원학회 2016 유기물자원화 Vol.24 No.1
혐기성 소화의 주요 조건 중 하나인 C/N비의 경우 하수슬러지는 5.40으로 낮게 나타난 반면 음폐수(Food waste leachate)는 21.84로 높게 나타났다. C/N비가 낮을 경우 혐기성소화의 저해 요인으로 작용될 수 있기 때문에 음폐수의 높은 유기물 농도 및 C/N 비를 활용하여 메탄가스 발생량 증가시킬 수 있었다. Tchobanoglous이 제안한 이론적 메탄가스 발생량 예측수식을 적용하여 메탄 및 바이오가스 발생량을 산정한 결과 하수슬러지 단일 혐기소화의 경우 305.6 mLㆍCH4/gㆍVS, 689.4 mLㆍCH4/gㆍVS의 메탄, 바이오가스가 발생하였고 음폐수 : 하수슬러지를 1:9로 혼합한 시료는 약 322 mLㆍCH4/gㆍVS, 3:7시료에서는 약 354 mLㆍCH4/gㆍVS, 5:5시료에서는 약 386 mLㆍCH4/gㆍVS의 메탄가스가 발생하는 것으로 분석되었다. BMP 실험 결과 1:9, 3:7, 5:5 비율로 병합 처리한 경우 각각 약 233, 298, 344 mLㆍCH4/gㆍVS의 메탄가스가 발생하였다. 따라서 음폐수의 혼합비율이 높아질수록 메탄가스 발생량은 증가하였고 하수슬러지와 음폐수의 혼합 비율에 따른 병합처리 시 하수슬러지 단독처리에 비해 다량의 메탄가스가 발생되었다. BMP 실험을 통해 생산된 메탄가스의 누적생산 곡선을 Modified Gompertz model과 first order kinetic model에 적용하여 추정한 결과, 메탄생성량은 Modified Gompertz model에서는 238.5, 302.3, 353.6 mL/gㆍVS 발생하였고 first order kinetic model에서는 242.8, 312.5, 365.5 mL/gㆍVS로 음폐수와의 혼합비율이 증가할수록 높게 나타났으며, 최대 메탄생성속도의 경우 3:7비율에서 48.2 mL/gVSㆍday로 최대 메탄생성 속도를 보였다. first order kinetic model의 1차 반응속도상수 k값은 1:9, 3:7, 5:5 비율에 따라 0.32, 0.22, 0.08day-1 나타났다. 1차 반응속도 상수의 경우 음폐수의 혼합비율이 낮을수록 높게 나타났다. Modified Gompertz와 first order kinetic model 모두 실험결과를 잘 모사하였으며, 실험결과와 모의결과의 적합도를 나타내는 상관계수(R2)의 경우 0.92∼0.98으로 높은 상관성을 나타내었다. We mix food waste leachate and sewage sludge by the proportion of 1:9, 3:7 and 5:5. It turns out that they produced 233, 298 and 344 CH4ㆍmL/gㆍVS of methane gas. The result suggests that as the mixing rate of food waste leachate rises, the methane gas productions increases as well. And more methane gas is made when co-digesting sewage sludge and food waste leachate based on the mixing ratio, rather than digesting only sewage sludge alone. Modified Gompertz and Exponential Model describe the BMP test results that show how methane gas are produced from organic waste. According to the test, higher the mixing rate of food waste leachate is, higher the methane gas productions is. The mixing ratio of food waste leachate that produces the largest volume of methane gas is 3:7. Modified Gompertz model and Exponential model describe the test results very well. The correlation values(R2) that show how the results of model prediction and experiment are close is 0.92 to 0.98.
강준구(Jun Koo Kang),조명현(Myeong Hyeon Cho) 한국국제경영학회 2002 國際經營硏究 Vol.13 No.1
This study explores the relation between close bank-ties and firm performance by investigationg the samples from Korea as well as Japan where banks play an important role in corporate financing. The study also focuses whether close bank ties affect the performance of Korean Chaebol and Japanese Keiratsu. Two important findings: First, the higher ratio of bank debt to assets is the lower the corporate performance is for both Korean firms and Japanese firms, suggesting negative effect of bank debt on corporate profitability. The result remains same for Korean Chaebol, but in case of Japanese Keiratsu a positive relation between bank loan ratio and firm performance is found. Second, we find a positive relation between firm performance and main bank`s stock ownership for Korean firms, while the relation is negative for Japanese firms. This result suggests that Korean banks passively own corporate stock for the purpose of investment and Japanese bank`s deep involvement in a firm`s management could cause serious costs. Interestingly, however, the relation is negative in case of Korean Chaebol and is positive for Japanese Keiratsu. These results suggest that banks may play different roles in Korea and in Japan. They also implies that the roles of banks are still different for Chaebol firms as well as Keiratu firms.