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박종환,허재영,이수림,이재훈,황세욱,조현지,권진혁,장영호,서동철,Park, Jong-Hwan,Heo, Jae-Young,Lee, Su-Lim,Lee, Jae-Hoon,Hwang, Se-Wook,Cho, Hyeon-Ji,Kwon, Jin-Hyeuk,Chang, Young-Ho,Seo, Dong-Cheol 한국환경농학회 2021 한국환경농학회지 Vol.40 No.1
BACKGROUND: Although the calcined oyster shell can be used as a calcium-rich adsorbent for phosphate removal, information about it is limited. The purpose of this study was to evaluate the phosphate adsorption characteristics and its mechanism using calcined oyster shells. METHODS AND RESULTS: In this study, calcined oyster shell (C-OS600) was prepared by calcining oyster shells (P-OS) at 600℃ for 20 min. Phosphate adsorption by C-OS600 was performed under various environmental conditions. Phosphate adsorption by C-OS600 occurred rapidly at the beginning of the reaction, and the time to reach equilibrium was less than 1 h. The optimal isotherm and kinetic models for predicting the adsorption of phosphate by C-OS600 were the Langmuir isotherm and pseudo-second order kinetic model, respectively, and the maximum adsorption capacity derived from the Langmuir isotherm was 68.0 mg/g. The adsorption properties of phosphate by C-OS600 were dominantly influenced by the initial pH and C-OS600 dose. In addition, SEM-EDS and FTIR analysis clearly showed a difference in C-OS600 before and after phosphate adsorption, which proved that phosphate was adsorbed on the surface of C-OS600. CONCLUSION: Overall, the calcined oyster shell can be considered as an useful and effective adsorbent to treat wastewater containing phosphate.
박종환,오상천,동진근,Park, Jong-Hwan,Oh, Sang-Chun,Dong, Jin-Keun 대한치과보철학회 1995 대한치과보철학회지 Vol.33 No.1
This study was designed as a reference of vertical dimension in prosthetic treatment. The author analyzed six facial measurements, namely, (1) the height of lower face at maximum intercuspal position, (2) the height of lower face at resting position, (3) midface, (4) external ear and lateral wall of orbit, (5) interpupillary distance, (6) distance between pupil and mouth in the 100 Won-kwang Univ. Dental collage students(50 : male, 50 : female), who have normal occlusion, no posterior prosthesis, no experience of orthodontic treatment, and no deformity of facial soft tissue and no temporomandibular dysfunction. The results of this study were as follows : 1. The length of midface was shortest and the inter-pupillary distance was longest in both male and female. 2. The length difference with the length of midface and lower face at maximum intercuspal position was 5.64mm in male and 2.23mm in female, so the lower face was longer, 3. The facial measuring component, similar to lower face at maximum intercuspation, was the length of between medial wall of external ear and lateral wall of orbit. It's difference was 1.3mm in male, 1.77mm in female, and the lower face was shorter. 4. The difference of lower facial length in resting position and maximum intercuspation was 2.48mm in male, 2.24mm in female, the length of resting position was therefore longer. 5. The most clost correlation with the height of maximum intercuspal positioning lower face was resting lower face in both groups.
비만 고령여성의 좌식행동과 Cystatin C 및 혈압의 관계
박종환(Park, Jong-Hwan),박상갑(Park, Sang-Kab),이덕만(Lee, Duk-Man),정민기(Jeong, Min-Ki),김동현(Kim, Dong-Hyun),이태홍(Lee, Tae-Hong),전성호(Jun, Sung-Ho),박종국(Park, Jong-Kook),김은희(Kim, Eun-Hee),민석기(Min, Seok.Ki),박진기(Park 한국체육과학회 2014 한국체육과학회지 Vol.23 No.1
The purpose of this study was to examine the relationship between the sedentary behavior and cystatin C, blood pressure in obese elderly women. Total of 80 obese elderly women (aged 70.3±O.4 years, mean±SEM; body mass index ≥25㎏/㎡) were analysed in the cross-sectional design. Prior to the blood collection, participants were asked to wear an uniaxial accelerometer for 4 consecutive weeks for the determination of sedentary behavior status. After a 10-h overnight fast, fasting venous blood samples were obtained from each participant. Fasting serum cystatin C concentrations was positively correlated with the sedentary time (r=0.599, P=0.001). The sedentary time was positively correlated with pulse pressure in obese elderly women (r=0.340, P=0.002). Moreover, the sedentary time was positively correlated with plasma insulin concentrations in obese elderly women (r=0.742, P=0.001). This study demonstrates that high amount sedentary time may negatively influences on renal function in obese elderly women. In summary, the current findings of the study suggest that reducing sedentary behavior could have public health implications including the prevention of obesity and blood pressure.
소화기 ; Churg-Strauss 증후군 환자에서 발생한 무결석 담낭염
박종환 ( Jong Hwan Park ),강대환 ( Dae Hwan Kang ),이진호 ( Jin Ho Lee ),김민대 ( Min Dae Kim ),최철웅 ( Cheol Woong Choi ),김형욱 ( Hyung Wook Kim ) 대한내과학회 2010 대한내과학회지 Vol.79 No.4
저자들은 급성 무결석성 담낭염으로 발현한 Churg-Strauss 증후군 환자를 조직 소견을 포함한 ACR 기준에 따라 진단하여 치료하였고, 증상 호전 후 담낭절제술을 시행하였는데 담낭조직에서는 호산구 침윤이나 혈관염을 찾을 수 없었던 증례를 경험하여 관련 문헌 및 최근 문헌보고와 함께 보고하는 바이다. Churg-Strauss syndrome is an uncommon disorder characterized by asthma, hypereosinophilia, and systemic vasculitis. Gastrointestinal involvement is commonly encountered in Churg-Strauss syndrome; however, acute cholecystitis is rare, and few cases have been documented in the literature. A 22-year-old female with a history of asthma was admitted with a complaint of steady pain in the right upper abdominal quadrant. Laboratory test results showed leukocytosis with hypereosinophilia. Abdominal ultrasonography and computed tomography revealed acute cholecystitis. Her symptoms did not improve with conservative treatment, so she underwent percutaneous transhepatic gallbladder drainage. Subsequently, peripheral neuropathy, erythematous papules on the skin, and dyspnea developed. A chest computed tomography scan showed bilateral pulmonary infiltrates. A pathological examination of the skin lesion indicated necrotizing vasculitis with eosinophilic infiltrates. She was diagnosed with Churg-Strauss syndrome. She was treated with corticosteroids, and her condition improved dramatically. After the drainage catheter was removed, complications including a bile leak occurred. Consequently, a cholecystectomy was performed. (Korean J Med 79:412-416, 2010)
박종환 ( Jong-hwan Park ),이효종 ( Hyo Jong Lee ) 한국정보처리학회 2014 한국정보처리학회 학술대회논문집 Vol.21 No.1
폐쇄회로 TV는 우리의 생활에 밀접하게 접근할 수 있는 수준에 다다르게 되었다. 따라서 중요한 작업은 영상에서 우리가 원하는 개체를 검출해내는 것이라 할 수 있다. 그 중에서 사람의 모습을 촬영해서 사람의 특징을 추출하는 연구가 많이 진행되었고 이를 이용해서 실제 CCTV 영상을 토대로 개체를 검출해내는 시스템에 대해 고찰하였다. 여러 가지 개체 검출 알고리즘 중에서 오픈소스로 제공이 되며, 다중 개체를 검출하기 위해서 Haar-like feature를 이용한 개체 추출 알고리즘을 이용하여 CCTV 다중 대체 검출에 대해 실험을 진행하였다. 정지영상에서는 정면을 응시하는 얼굴영역 검출에서는 높은 성능을 보이며 다른 각도에서는 차이가 있지만 무난한 성능을 보이지만 실시간에서는 보정 작업이 필요하게 되었다.
질소 및 인 함유 폐양액 처리를 위한 최적 인공습지 시스템 선정
박종환(Jong-Hwan Park),서동철(Dong-Cheol Seo),서동철(Dong-Cheol Seo),서동철(Dong-Cheol Seo),최정호(Jeong-Ho Choi),김홍출(Hong-Chul Kim),이상원(Sang-Won Lee),하영래(Yeong Rae Ha),조주식(Ju-Sik Cho),허종수(Jong-Soo Heo) 한국토양비료학회 2012 한국토양비료학회지 Vol.45 No.5
질소 및 인 함유 폐양액 처리를 위한 최적 인공습지 시스템을 선정하기 위해 처리조의 연결방식을 달리하여 최적 system을 선정하였고, 선정된 최적조건하에서 폐양액 부하량에 대한 적응성을 평가하였다. 현장 폐양액처리장에서 시스템별 정화효율을 평가한 결과 system A의 BOD, COD, SS, T-N 및 T-P의 처리효율은 각각 88, 77, 94, 54 및 94%로서 다른 시스템에 비해 가장 높은 정화효율을 보였다. 현장 폐양액처리장에서 폐양액 부하량별 수처리 효율을 조사한 결과 system A의 BOD, COD, SS, T-N 및 T-P의 처리효율은 폐양액 부하량에 따라 별 차이 없이 각각 87-89, 76-79, 93-94, 52-55 및 91-94%로 전반적으로 높고 안정적으로 처리되었다. 하지만 T-N의 처리효율은 55% 정도 수준으로 폐수배출기준을 안정적으로 만족하기 위해서는 질소 처리효율을 좀 더 향상시킬 필요가 있을 것으로 판단된다. In order to develop constructed wetlands for treating hydroponic wastewater in greenhouse, actual constructed wetlands were used the obtained optimum condition in previous study, and the removal rate of pollutant in the water according to 4 kinds connection method of piping such as system A (UP-UP stream), system B (UP-DOWN system), system C (DOWN-UP stream) and system D (DOWN-DOWN stream) were investigated. Removal rate of biochemical oxygen demand (BOD), chemical oxygen demand (COD), suspended solids (SS), total nitrogen (T-N) and total phosphorus (T-P) by system A (UP-UP stream) connection method in actual constructed wetlands were slightly higher than other systems. At the system A, the removal rate of BOD, COD, SS, T-N and T-P were 88, 77, 94, 54 and 94%, respectively. Under different hydroponic wastewater loading, the removal rates of pollutants were higher in the order of 75 L m<SUP>-2</SUP> day<SUP>-1</SUP> ≒ 150 L m<SUP>-2</SUP> day<SUP>-1</SUP> ?300 L m<SUP>-2</SUP> day<SUP>-1</SUP>. Therefore, optimum connection method was system A for treating hydroponic wastewater in greenhouse.