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Giving up smoking dynamic on adolescent nicotine dependence
Haneul CHOI,Ilhyo JUNG,YongHan KANG 한국산업응용수학회 2011 한국산업응용수학회 학술대회 논문집 Vol.6 No.1
This paper is aimed at qualitative giving up smoking dynamic on adolescent. A basic mathematical model, which is a slight refinement of the model presented in [F. Brauer, C. Castillo-Chavez. Mathematical Models in Population Biology and Epidemiology. Text in Applied Mathematics. Springer, 2000; G.C. Castillo, S.G. Jordan, A.H. Rodriguez. Mathematical models for the dynamics of tobacco use, recovery and relapse. Technical Report Series, BU-1505-M. Department of Biometrics, Cornell University. 2000] is designed first of all. This paper (based on) subdividing the total population in the middle and high school into non-smoking, smokers, which are divided into each two subclasses; FTND scores of zero point to four point indicating severe nicotine dependence and FTND scores of five point to ten point indicating severe nicotine dependence, quit temporarily and quit permanently, which is one possible extension of the susceptible-infective-removed(SIR) type epidemic model. It is assumed that non-smoker never has been smoking and temporary smokers may become smoker again or permanent smokers and permanent smokers once quit never smoking in the entire life span and is defined as more than 6month stopping smoker by WHO. The existence and stability of the smoking-free equilibria and positive equilibria of the model are examined in terms of a certain threshold condition К?, the smoking generation number(the basic reproduction number), is less than unity, and unstable of this threshold is greater than unity.
Microscale BTS sculptured by electron beam
Choi, Haneul,Jeong, Young Woo,Chang, Hye Jung Korean Society of Microscopy 2019 Applied microscopy Vol.49 No.0
We applied the advanced bitmap-assisted patterning function of focused ion beam to fabricate microscale sculpture of the 'BangTanSoNyeonDan' known as BTS members, the world-wide famous K-pop boyband. With the help of an electron microscope, you can carve your idols on your accessories at micro scale. Fun applications of electron microscopes are not limited to science.
학교 교실의 초미세먼지 저감을 위한 급기 환기 전략 개발
최하늘(Choi, Haneul),이주원(Lee, Joowon),가서사(Jia, Ruisi),김동현(Kim, Donghyun),나후승(Na, Hooseung),김태연(Kim, Taeyeon) 대한건축학회 2020 대한건축학회논문집 Vol.36 No.9
The purpose of this study is to propose a novel method to pressurize a room using a ventilation system to block outdoor PM<SUB>2.5</SUB> through infiltration. We made various cases according to the building airtightness performance, pressurization ratio, and filter level, and evaluated the performance of the proposed method using simulation. As the simulation method, CONTAM, mass balance equation, simple thermal load equation, and regression equation were used. As a result, first, using the proposed method, the indoor PM<SUB>2.5</SUB> concentration could be reduced to a maximum of 30% even on a day when the outdoor PM<SUB>2.5</SUB> concentration is high. Second, in the case of airtight buildings, it showed excellent performance even with less pressure. Third, improving the filter level of the ventilation system was a good way to further reduce indoor PM<SUB>2.5</SUB>. Finally, a moderate level of pressurization strategy was found to be thermally beneficial.
최하늘(Haneul Choi) 학습자중심교과교육학회 2021 학습자중심교과교육연구 Vol.21 No.18
목적 본 연구에서는 초등학교 교사의 학생 자치활동에 대한 인식을 이해하고 이를 통해 학생 자치활동 활성화에 시사점을 제시하고자 한다. 방법 이를 위하여 학생자치업무 경험이 있는 초등학교 교사 3명을 대상으로 반 구조화된 면담을 실시하였다. 면담 자료를 수집하여 검토하고 범주화한 후 주제를 도출하였으며 연구 참여자 및 교수 2인과 동료 연구자 1인의 검수 과정을 거쳤다. 결과 연구 결과를 간략하게 요약하면 세 가지이다. 첫째, 연구 참여자는 학생 자치조직의 형식적인 운영, 학생들의 수동적인 참여 등으로 학생 자치활동 운영에 어려움을 겪고 있었다. 둘째, 연구 참여자는 교육과정 속에서 학생자치의 내실화된 운영, 학년 및 학교 내 협력 교육의 필요성을 느끼고 있었다. 셋째, 연구 참여자는 학생들의 긍정적인 자치활동 경험을 위해서 학교 내외의 지원이 중요하다고 인식하고 있었다. 결론 연구 결과에 근거하여 연구자는 초등학교 교사들의 자치활동 인식을 이해할 수 있었다. 첫째, 학생 자치활동 참여자들의 역량 강화 필요를 확인할 수 있다. 둘째, 학생자치에서 단위학교 및 교육청 지원의 중요성을 확인할 수 있었다. 마지막으로 학생자치 활성화 시사점을 인식변화와 제도변화 측면에서 제시하였다. Objectives The purposes of this study were to understand the recognition of elementary school teachers’ student autonomy. And this suggests revitalizations for student autonomy. Methods For this, the researcher collected and analyzed the data through semi-structured interviews for three elementary school teachers who have student autonomous work experience. Results There are three extractions from the resarch results. First, the study participants were having difficulty in operating student autonomy activities due to the perfunctorily operating of the student autonomy organization, and the manually participating of students. Second, the study participants need to the operation of student autonomy activities in the curriculum, grade and school cooperation education. Third, the participants recognize that the supports of the school inside and outside are important for students positive autonomy activity experience. Conclusions Based on the research results, the researcher recognized the recognition of elementary school teacher’ student autonomy in two aspects. First, it is necessary to strengthen the competence of student autonomy participants. Second, In student autonomy it is important to support from the unit of the school and the education office. In conclusion, a plan to revitalize student autonomy is presented in terms of awareness and system change.