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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.
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.
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.
박종환 ( Jong-hwan Park ),김홍출 ( Hong-chul Kim ),김영진 ( Yeong-jin Kim ),김성헌 ( Seong-heon Kim ),서동철 ( Dong-cheol Seo ) 한국환경농학회 2017 한국환경농학회지 Vol.36 No.1
본 연구는 커피찌꺼기의 환경친화적인 재활용 방안을 모색하기 위하여 커피찌꺼기 biochar를 제조하고, 제조된 biochar를 이용하여 구리에 대한 흡착특성을 평가하였다. 커피찌꺼기 biochar에 대한 구리의 흡착은 반응 2시간 이내에 급격하게 일어나는 것을 알 수 있었으며, 2시간 이후부터는 천천히 평형상태에 도달하는 것을 알 수 있었다. 등온흡착 실험의 결과 Langmuir 및 Freundlich 등온흡착식 모두에서 CB600이 CB300에 비해 높은 흡착능을 보였다. 커피찌꺼기 biochar에 대한 구리의 흡착능 예측을 위한 최적모델로는 동적흡착모델의 경우 유사이차속도반응식, 그리고 등온흡착모델의 경우 Langmuir 등온식이 더 적합하였다. 또한 SEM-EDS 분석결과 구리 흡착 후 biochar 표면에 구리가 매우 높은 농도로 흡착되어 있었으며, 이들의 흡착은 biochar 표면의 양이온 교환과 밀접한 관계가 있을 것으로 판단된다. 이상의 결과를 미루어볼 때, 커피찌꺼기는 biochar 제조를 위한 재료로 충분히 활용이 가능하며, 구리 흡착제로 활용이 가능할 것으로 판단된다. BACKGROUND: There is very limited knowledge of the effects of biochar derived from exhausted coffee residue on metal adsorption processes. Furthermore, only limited information is available on the adsorption mechanism of copper. The aim of this study was to evaluate the absorption behaviors of copper by biochar derived from exhausted coffee residue. METHODS AND RESULTS: Biochars produced by pyrolysis of exhausted coffee residue at 300℃(CB300) and 600℃ (CB600) were characterized and investigated as adsorbents for the removal of copper from aqueous solution. The results indicated that the adsorption equilibrium was achieved around 2 h and the pseudo-second-order kinetic model fit the data better than the pseudo-first-order kinetic model. The maximum Cu adsorption capacities of CB600 by Freundlich and Langmuir isotherms were higher than those of CB300. The adsorption data were well described by a Langmuir isotherm compare to Freundlich isotherm. CONCLUSION: Our results suggest that exhausted coffee residue can be used as feedstock materials to produce high quality biochar, which could be used as adsorbents to removal copper.
스테인리스 스틸의 마찰교반용접 기술 및 접합부 성능 개선에 관한 연구
박종환(Jong-Hwan Park),홍성태(Sung-Tae Hong),박수경(Su-Kyung Park),김석현(Suk-Hyun Kim) 한국자동차공학회 2010 한국자동차공학회 지부 학술대회 논문집 Vol.2010 No.12
Friction stir welding process of stainless steel pipes for automotive light-weigh exhaust system was developed. The experimental results show that the friction stir welded joint provide significantly superior mechanical and material properties to the conventionally welded joint (TIG).