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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.
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.
박종환(Jong-Hwan Park),지명자(Myung-Ja Ji) 한국콘텐츠학회 2018 한국콘텐츠학회논문지 Vol.18 No.11
본 연구는 기혼여성들의 대학원 진학 경험에 관한 영향과 그 의미를 알아보고 시대가 원하는 여성상과 기혼여성들의 삶에는 어떤 괴리가 있으며, 또한 사회 정책적인 면에서는 어떤 관련이 있는지에 대하여 시사점을 제공하고자 한다. 연구결과 기혼여성들이 대학원에 진학하게 된 동기는 심리적 갈등과 공허감, 도전을 통한 자기실현에 있음을 알게 되었다. 그리고 대학원에 진학을 했을 때 일과 가정의 양립, 학업의 어려움, 신체와 경제적인 문제 등에 둘러싸여 고투하면서 학업을 이어가는 것으로 나타났다. 본 연구자는 연구 참여자들이 확고한 수학의지와 가족과 주변사람들의 지지라는 자원을 잘 이용하여 난관을 극복하고 변화를 이루어내는 과정을 탐구하면서, 연구를 통해 도출된 주제를 통하여 대학원 진학을 준비하는 기혼여성들에게 좋은 모델링을 제시하고자 한다. The purpose of this study is to investigate the impact and significance of married women’s graduate school experiences, as well as to assess the differences in the images of a model woman and that of a real life married woman, and their implications in the aspect of social policies. Results showed that the reason married women enter graduate schools are psychological conflicts, feeling of emptiness, and self motivation for self realization. It was also found that once married women are in graduate school, they are faced with many difficulties such as balancing work and family lives, dealing with academic difficulties and physical / economic obstacles as they struggle to continue their studies. After exploring how the study participants overcame their difficulties and accomplished changes in their lives with the best use of available resources such as firm willingness to continue their studies and support from family and friends, this researcher wishes to present a sound guidance resulting from this study to married women who are preparing for graduate school.
Jong Hwan Park(박종환),Kyu Young Choi(최규영),Dong Hoon Lee(이동훈) 한국방송·미디어공학회 2007 한국방송공학회 학술발표대회 논문집 Vol.2007 No.-
It has been widely believed that one can obtain l-Hierarchical Identity Based Encryption (HIBE) scheme secure against chosen ciphertext attacks from (l+1)-HIBE scheme secure against chosen plaintext attacks. In this paper, however, we show that when applying two concrete HIBE schemes that Boneh et al. [1, 2] proposed, chosen ciphertext secure l-HIBE schemes are directly derived from chosen plaintext secure l-HIBE schemes. Our constructions are based on a one-time signature-based transformation that Canetti et al. [3] proposed. The security of our schemes is proved in the selective-ID security model without using random oracles.
Jong-Hwan Park(박종환),Armin W. Troesch(아민 트로쉬) 한국해양공학회 1993 韓國海洋工學會誌 Vol.7 No.1
선수충격파의 문제를 푸는데 있어서 Boundary Integral Method(BIM)의 여러가지 수치해석방법이 검토되었으며, 특히 여러가지 Time Stepping Scheme, Green function, far-field 조건등에 따른 수치해석안정성과 정확성의 상관관계가 연구되었다.<br/> von Neumann 안정성해석과 matrix 안정성해석 등을 이용한 선형 안정성해석을 기초로 하여, 수치해석방법의 안정성 여부를 체계적으로 조사할 수 있는 parameter(Free Surface Stability number)를 설정하고, 이 parameter의 변화에 따른 비선형 운동해석을 연구하였다. 그 결과 비선형성이 심하지 않은 기진파의 경우에서는 비선형 운동해석의 수치해석 안정성이 선형 수치해석 안정성과 큰 차이가 없음을 알 수 있게 된다.