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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.
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.
서동철(Dong-Cheol Seo),강세원(Se-Won Kang),김현욱(Hyunook Kim),한명자(Myung-Ja Han),임병진(Byung-Jin Lim),박종환(Jong-Hwan Park),김갑순(Kap-Soon Kim),이영재(Yeong-Jae Lee),최익원(Ik-Won Choi),허종수(Jong-Soo Heo),조주식(Ju-Sik Cho) 한국토양비료학회 2011 한국토양비료학회지 Vol.44 No.2
주암호 상수원 상류지역에 위치한 복내 바이오파크 인공습지의 수생태학적 효율 향상을 위한 관리 방안을 제시하기 위하여 시기별, 계절별 및 오염물질 부하량별 수처리 효율을 평가하였다. 유입원수의 BOD, SS, T-N 및 T-P의 함량은 각각 1.87-4.23, 5.2-24.0, 4.94-15.59 및 0.10-0.75 mg L<SUP>-1</SUP> 범위이었으며, 연평균 처리효율은 BOD, SS,T-N 및 T-P가 각각 26, 43, 62 및 83%로서 BOD 처리효율은 낮았으나 T-N과 T-P 처리효율은 매우 높았다. 계절별 수처리 효율은 전반적으로 동절기에 비하여 하절기에 높았으며 T-P의 처리효율은 계절적인 차이 없이 비교적 일정하게 높은 처리효율을 보였다. 인공습지 구성시스템별 오염물질 부하량에 따른 오염물질 처리량은 BOD는 침강지> 습지조 > 마이크로폴, T-N과 SS는 습지조 > 침강지 >마이크로폴 순이었으며 T-P의 경우에는 습지 구성 시스템별 큰 차이 없이 비교적 일정한 처리량을 보였다. Boknae Bio-park is a free water surface constructed wetlands to remove non-point source pollution. Boknae Bio-park constructed wetlands (CWs) consist of forebay, wetlands (1<SUP>st</SUP>, 2<SUP>nd</SUP>, and 3<SUP>rd</SUP> wetlands), and micropool. The concentrations of BOD, SS, T-N and T-P in inflow were 1.87-4.23, 5.2-24.0, 4.94-15.59 and 0.10-0.75 mg L<SUP>-1</SUP> in Boknae Bio-park CWs from April to December in 2008, respectively. The removal rates of BOD, SS, T-N and T-P in Boknae Bio-park CWs were 26, 43, 62 and 83%, respectively. The removal rates of BOD and SS in the spring and summer were higher than those in other seasons. The removal rates of T-N and T-P on spring were slightly higher than those in other seasons. The amounts of pollutants removal in Boknae Bio-park CWs were higher in the order of forebay > wetlands > micropool for BOD, wetlands > forebay > micropool for SS and wetlands > forebay > micropool for T-N. The amount of T-P removal was not significant different in all areas.
인체 전기 신호 계측을 위한 pre-amplifier의 제작
박종환 ( Jong Hwan Park ),천우영 ( Woo Young Chun ),박형준 ( Hyung Jun Park ),박병림 ( Byung Lim Park ) 한국감성과학회 1997 연차 학술대회 논문집 Vol.1997 No.-
In this study, the pre-amplifiers were manufac-tured, which correspinds with the properties of signal source, For measuring the EMG, EEG, ECG and EOG``s signal, which are generated at human body, the pre-amplifiers were manufactured in this study which was corresponding with the propertiies of each signal source. So as to do, the bandwidth of filters and the amplitude of amplifiers were adaptively adjusted, according to signal source. Then, the usefulness was represented by showing the measured examples.
복합운동이 소아비만의 신체구성, 체력 및 경동맥 구조와 기능에 미치는 영향
박종환(Park, Jong-Hwan),정민기(Jeong, Min-Ki),김권민(Kim, Gwon-Min),박현태(Park, Hyun-Tae),김은희(Kim, Eun-Hee),박상갑(Park, Sang-Kab),권유찬(Kwon, Yoo-Chan) 한국체육과학회 2014 한국체육과학회지 Vol.23 No.3
The purpose of this study was to investigate the effects of 12-week combined exercise on body composition, physical fitness and carotid artery structure and function in obese children. We recruited 20 obese children (age range, 11 years): a combined group (n=10) and control group (n=10). The frequency of exercise for the combined (i.e., resistance and aerobic exercise) group was 3 times per week (i.e., Monday, Wednesday, and Friday) for 12 weeks. Each 60-minute exercise programme included 10 minutes of warm-up activities and 10 minutes of cool-down activities. The results of this study showed that combined exercise improves body composition after 12 weeks. Physical fitness was significantly increase than baseline values in the combined group. However, carotid artery structure and function was not significantly change after 12 weeks combined exercise programme may be an effective intervention strategy for improving body composition and physical fitness in obese children.
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.