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박유진,김정훈,박지은,김지인,이종민,Park, Yujin,Kim, Junghun,Park, Jieun,Kim, Jiin,Lee, Jongmin 대한의용생체공학회 2017 의공학회지 Vol.38 No.5
In this study, We investigated the effect of foot cooling on the reduction of body temperature after hard exercise at the high temperature of $40^{\circ}C$. We performed a total of 30 subjects, and the subjects performed treadmill exercise for 30 minutes. We produced the cooling device to cool the foot using Peltier module. After the end of the exercise, We performed normal recovery method and cooling recovery method(one foot, both feet) for 1 hour on the same indoor environmental conditions and confirmed the change of body temperature of subjects. The results of deep body temperature measurement showed average $38.78{\pm}0.22^{\circ}C$ to $38.54{\pm}0.15^{\circ}C$ when the normal recovery method was performed. Cooling recovery method on one foot showed average $38.69{\pm}0.14^{\circ}C$ to average $38.06{\pm}0.17^{\circ}C$ and Cooling recovery method on both feet showed average $38.69{\pm}0.15^{\circ}C$ to average $37.84{\pm}0.21^{\circ}C$. There was a significant difference between the normal recovery method and the one foot cooling recovery method(p < .05), there was a significant difference between the normal recovery method and the both feet cooling recovery method(p < .05) and there was a significant difference between the one foot cooling recovery method and the both feet cooling recovery method(p < .05). Body temperature showed the lowest decrease rate when the normal recovery method was performed, and body temperature showed the highest decrease rate when the both feet cooling recovery method was performed. Therefore, recovery of cooling on the foot after hard exercise have decreased body temperature, delay fatigue in the body, and will be contributed to improvement of athlete performance.
염화주석용액을 이용한 폐인쇄회로기판으로부터 부품의 분리
박유진,유경근,Park, Yujin,Yoo, Kyoungkeun 한국자원리싸이클링학회 2021 資源 리싸이클링 Vol.30 No.2
Dismantling tests were performed to separate components from waste printed circuit boards (PCBs) using HCl solution with Sn4+. Then, the effects of agitation speed, reaction temperature, initial Sn4+ concentration, and HCl concentration on the dismantling of components were investigated. No significant effect on the dismantling speed was observed upon changing the agitation speed from 100 to 300 rpm. However, the dismantling rate increased with increasing reaction temperature, Sn4+ concentration, and HCl concentration. In the all-component dismantling tests, when the dismantling ratio increased to 100%, no solder was observed on the boards, and the Sn4+ concentration was ~1,500 mg/L. The dismantling ratio of the components from the PCB increased to 100% within 2 h when 1 mol/L HCl solution with 10,000 mg/L Sn4+ was used at an agitation speed and temperature of 200 rpm and 90 ℃, respectively.
국어과 교과서의 여성가사 수록 현황과 대안의 모색 ―여성주의 관점에서
박유진 ( Park Yujin ) 국어교육학회 2016 國語敎育學硏究 Vol.51 No.4
본고는 고등학교 국어, 문학 교과서에 수록된 여성가사에 주목하여수록 양상을 살펴본 후, 여성주의 관점에서 여성가사 수록의 개선점을 모색해 보았다. 이를 위해 먼저 문학 교과서에 수록된 여성가사 중 <덴동어미화전가>와 <규원가>를 중심으로 학습활동 내용의 적절성, 수록 부분의 적절성, 문학사 서술과 규방가사 설명의 적절성, 남성가사와의 비교를 중심으로 살펴 보았다. 그 결과 여성가사는 남성 작품의 수에 비해 수록작품의 수나 수록 횟수가 적고, 여성의 가사 창작·향유·유통의 측면이나 작품의 문학사적 의의를 충분히 반영하고 있지 못함을 확인할 수 있었다. 이러한 상황에서 앞으로 여성가사의 문학사적 의의를 정립하는 것이중요하며 여성가사의 대표작품 발굴과 선별, 여성어문생활을 입체적으로 설명할 수 있도록 하는 꼼꼼한 문학사 기술이 필요함을 역설하였다. This study focused on Woman`s Gasa in high school Korean textbooks and literature textbooks, investigated the aspect of inclusion and sought the matters to improve for the inclusion of Woman`s Gasa from a feminist standpoint. For this purpose, this study first investigated “Dendong-Eomi-Hwajeonga” and “Gyuwonga” of the Woman`s Gasa included in literature textbooks, centering around the appropriateness of learning activity contents, the appropriateness of the parts included, the appropriateness of the description of literary history and Gyubang Gasa and a comparison with men`s classical poetry. As a result, it was found that, as compared to men`s classical poetry, there were fewer Woman`s Gasa works, which were included fewer times and did not fully reflect the aspects of writing, enjoyment and circulation or the meanings of the works in the literary history. In this situation, this study emphasized that it would be important to establish the meaning of Woman`s Gasa in literary history in the future, and it would be necessary to make close descriptions of literary history to discover and select representative Woman`s Gasa works and to allow a stereoscopic description of women`s linguistic life.
Taylor-Lie series를 이용한 원자로 점 동특성 방정식의 일차홀드 이산화
박유진(Yujin Park),정길도(Kilto Chong) 제어로봇시스템학회 2012 제어로봇시스템학회 합동학술대회 논문집 Vol.2012 No.7
Various numerical methods are studied to solve the point kinetics equations in nuclear dynamics. However the point kinetics equation has stiffness problem. So it is difficult to obtain accurate results. In this paper, we proposed a method based on the Taylor-Lie series method under the First order hold (FOH) assumption. To evaluate the performance of presented method, the procedure is tested using multi input signals. By applying the method to the equation, we can resolve the stiffness problem.