국내 환경기술개발 및 보급촉진에 대하여

박종환,Park, Jong-Hwan 환경보전협회 2003 환경정보 Vol.25 No.9

소성 굴패각에 의한 인산염의 흡착특성 및 메커니즘

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.

아파트 건축설비의 관련법규 검토

박종환,Park, Jong-Hwan 한국설비기술협회 1992 설비 : 공조ㆍ냉동ㆍ위생 Vol.9 No.9

위치기반 엔터테인먼트 솔루션

박종환,Park, Jong-Hwan 한국정보통신집흥협회 2003 정보화사회 Vol.165 No.-

수직고경 설정을 위한 안면 계측방법에 관한 비교 연구

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.

인공습지 축산폐수 처리장에서 수생식물의 영양염류 흡수특성 평가

박종환 ( Jong Hwan Park ),이충헌 ( Choong Heon Lee ),김성헌 ( Seong Heon Kim ),서동철 ( Dong Cheol Seo ),조주식 ( Ju Sik Cho ),허종수 ( Jong Soo Heo ) 한국환경농학회 2012 한국환경농학회 학술대회집 Vol.2012 No.-

커피찌꺼기 biochar를 활용한 구리의 흡착특성

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.

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.

05 포스터 발표 : 수질 환경 분야PW-15 ; 페로니켈슬래그와 고로급랭슬래그의 인 흡착특성

박종환 ( Jong Hwan Park ),김성헌 ( Seong Heon Kim ),서동철 ( Dong Cheol Seo ),강병화 ( Byung Hwa Kang ),조주식 ( Ju Sik Cho ),허종수 ( Jong Soo Heo ) 한국환경농학회 2014 한국환경농학회 학술대회집 Vol.2014 No.-

본 연구는 철강산업에서 배출되는 산업폐기물의 일종인 페로니켈슬래그와 고로급랭슬래그의 인공습지나 여과시스템에서 인에 대한 흡착제로서의 적용성을 검토하기 위한 연구로서 페로니켈슬래 그(FNS)와 고로급랭슬래그(RCS)를 입경별(유효입경: 0.5 mm, 2.5 mm)로 구분하여 Freundlich 및 Langmuir 등온흡착실험을 통해 인에 대한 흡착특성을 조사하였다. Freundlich 등온흡착식에 의한 페로니켈슬래그(FNS)와 고로급랭슬래그(RCS)의 인 흡착능(K)은 RCS 0.5(0.5105) > RCS 2.5(0.3571)> FNS 2.5(0.0545) ≒ FNS 0.5(0.0400) 순이었다. Langmuir 등온흡착식에 의한 인의 최대흡착능(a)은 FNS 0.5, FNS 2.5, RCS 0.5, RCS 2.5가 각각 320, 187, 3,582 및 2,983 mg kg-1이었다. 슬래 그의 인 흡착은 전반적으로 Langmuir 등온흡착식이 Freundlich 등온흡착식에 비해서 잘 일치하였다. 이상의 결과를 미루어 볼 때, 인 흡착능력은 고로급랭슬래그(RCS)가 페로니켈슬래그(FNS)보다 매우 높았으며, 고로급랭슬래그는 인공습지나 여과시스템에서 인 흡착을 위한 여재로 적용이 가능할 것으로 판단되며, 페로니켈슬래그는 인 흡착 시스템의 여재로 사용이 불가능 할 것으로 판단된다.

상담심리학과 3, 4학년 대학생들의 상담현장실습 경험에 관한 연구

박종환(Park, Jong Hwan),전영숙(Chun, Young Sook) 학습자중심교과교육학회 2021 학습자중심교과교육연구 Vol.21 No.10

목적 본 연구는 현장에서 상담실습을 경험하는 대학생들이 실습을 하는 과정에서 어떤 어려움을 경험하는지 알아보는 것이며, 그리고 상담실습 경험이 참여자들에게 어떤 의미와 영향을 주는지 연구하기 위한 것이다.방법 이를 위하여본 연구에서는 상담심리학을 전공하는 3, 4학년 대학생들 중 한 학기 동안 현장에서 상담 실습을 경험한 15명을 선정하여 Giorgi의 현상학적 질적 연구 방법으로 연구하였다.결과 15명의 참여자들로부터 인터뷰한 자료를 분석한 결과, 115개의 의미있는 진술이 도출되었고, 이를 다시 정리한 결과 88개의 주요코드를 작성하게 되었다. 그리고 코드별로 범주화하여 11개의 하위범주와 5개의 상위범주로 통합하였다. 그리고 참여자들의 초심으로 긴장과 염려 그리고 설렘과 기대감 속에서 정서적으로 도움을 주고 싶은 마음을 가지고 있었음이 드러났다. 실습 과정에서 참여자들은 학생들과 대화의 어려움과 관계 형성, 그리고 상황대처의 어려움을 갖고 있는 것으로 드러났다. 그런 가운데 동료들과 상호협력하는 경험은 참여자들에게 한 학기 동안 실습을 감당할 수 있었던 원동력이 되었던 것으로 나타났다.결론 결론적으로는 상담 실습 경험의 의미와 영향을 갖게 된 것인데, 의미로는 스스로 전공 학습의 미진함을 성찰하게 되었고, 긴장과 불안 속에서도 상담실무 경험을 성공적으로 마친 초보 상담자로서의 성취감과 더불어 내적 성장을 이루는 결과를 얻은 것으로 나타났다. 그리고 상담실습의 영향으로는 자신의 진로가 명료해졌고, 상담을 전공하는 정확한 가치관을 갖는 계기가 된 것으로 드러났다. Objectives This study is to find out what difficulties college students experiencing counseling practice experience in the field experience in the course of practice, and to study the meaning and impact of counseling practice experience on participants. Methods In this study, Giorgi s phenomenological method was used to study the experiences of counseling practice in the field during the semester for third and fourth graders majoring in counseling psychology. Results An analysis of the data interviewed by 15 participants resulted in 115 meaningful statements, which were compiled and 88 key codes were written. It was categorized by code and integrated into 11 subcategories and 5 upper categories. And it turned out that the participants wanted to help emotionally in tension, concern, excitement and anticipation with the initial intentions of the participants. During the exercise, participants were found to have difficulty communicating with students, forming relationships, and dealing with situations. Meanwhile, the experience of collaborating with colleagues was found to have been a driving force for participants to be able to handle practice for a semester. Conclusions In conclusion, it has the meaning and influence of counseling practice experience, meaning that it reflects the lack of major learning on its own, and achieved internal growth with a sense of accomplishment as a novice counselor who successfully completed counseling practice experience despite tension and anxiety. And the influence of counseling practice was found to have made his career clear and served as an opportunity to have accurate values of majoring in counseling.