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B<sub>4</sub>C 함량에 따른 6061 Al-B<sub>4</sub>C 복합분말의 소결 특성 연구
박진주,홍성모,김경열,이민구,이창규,이원혁,이양규,Park, Jin-Ju,Hong, Sung-Mo,Kim, Kyoung-Yeol,Lee, Min-Ku,Rhee, Chang-Kyu,Rhee, Won-Hyuk,Lee, Yang Kyu 한국분말야금학회 2013 한국분말재료학회지 (KPMI) Vol.20 No.3
In the present work, 6061 Al-$B_4C$ sintered composites containing different $B_4C$ contents were fabricated and their characteristic were investigated as a function of sintering temperature. For this, composite powders and their compacts with $B_4C$ various contents from 0 to 40 wt.% were fabricated using a planetary ball milling equipment and cold isostatic pressing, respectively, and then they were sintered in the temperature ranges of 580 to $660^{\circ}C$. Above sintering temperature of $640^{\circ}C$, real density was decreased due to the occurrence of sweat phenomena. In addition, it was realized that sinterability of 6061Al-$B_4C$ composite material was lowered with increasing $B_4C$ content, resulting in the decrease in its real density and at the same time in the increment of porosity.
광주시민의 구강보건행태와 편백나무 추출물 세치제 구매 동향분석
박진주(Jin-Ju Park),이숙영(Sook-Young Lee),김수관(Su-Gwan Kim) 한국콘텐츠학회 2012 한국콘텐츠학회논문지 Vol.12 No.12
본 연구는 광주 시민들의 칫솔질 행태와 치약 이용 현황, 치약구매 중요성, 편백추출물 함유치약의식 현황을 조사하여, 향후 편백추출물 함유치약을 통해 광주지역 내 치과산업 메카로서의 구강보건용품 개발을 위한 기초자료를 제공함에 목적이 있다. 광주광역시에 거주중인 시민을 대상으로 치약제품의 구매 및 이용 시 고려할 수 있는 항목들에 대해 각각의 중요도를 조사한 결과, 종합 점수는 68.2점이었으며, 효과 측면의 중요도가 83.3점으로 가장 높았으며 항목별 중요도를 살펴보면, 충치예방효과가 85.1점으로 가장 높았다. 연령에 따른 구매 외부요인 중요도의 차이를 살펴보면, 40대와 60세 이상을 제외한 모든 연령대에서 인증기관 검증 항목의 중요도가 가장 높게 조사되었지만, 40대와 60세 이상은 가격에 대한 중요도가 타 항목보다 높았으며, 연령에 따른 효과성에 대한 중요도의 차이를 살펴보면, 20세 미만은 충치예방과 치아미백 효과에 대한 중요도가 각각 79.8점으로 가장 높았다. 편백추출물을 이용한 치약이 개발된다면 이용할 의향이 있는가라는 질문에 그렇다는 응답이 54.6%, 편백추출물을 함유한 치약이 치아 건강에 효과적일 것이라고 생각하는가라는 질문에 그렇다는 응답이 55.1%, 편백추출물을 함유한 치약의 주된 효능으로 충치 예방이라는 응답이 33.8%로 나타났다. 향후 이 연구를 기초자료로 활용하여 본격적인 세치제 개발의 세부적인 연구가 더 활발히 이루어져야 할 것으로 생각된다. The purpose of this study was to examine the toothbrushing behavior of the citizens, their use of dentifrice, awareness of the importance of dentifrice purchase and consciousness of dentifrice containing the extract of Chamaecyparis obtusa in the city of Gwangju. It’s basically meant to provide some informations on the development of oral health supplies involving dentifrice containing the extract of Chamaecyparis obtusa in that city in an effort to help the city serve as a hub of the dental industry. The subjects in this study were the selected citizens in the city of Gwangju. As a result of analyzing their awareness of the importance of the considerations for the purchase and use of dentifrice, they gave 68.2% overall. They gave the highest marks of 83.3% to the importance of effect. As for the importance of each item, they gave the highest marks of 85.1% to the importance of the prevention of dental caries. Concerning differences in awareness of the importance of the external purchase factors according to age, every age group placed the most importance on inspection by the certification authorities except for those who were in their 40s and 60s, and the respondents who were in their 40s and 60s attached more importance to price than the other items. Regarding differences in awareness of the importance of effectiveness according to age, those who were under the age of 20 gave the highest marks of 79.8% to the importance of dental-caries prevention and whitening effects. As a result of asking them whether they had an intention to use dentifrice containing the extract of Chamaecyparis obtusa if this dentifrice would be developed, 54.6% replied they had the intention. When they were asked another question whether they thought this dentifrice would have an effect on oral health, 55.1% answered they thought so. 33.8% expected this dentifrice to have a primary effect on the prevention of dental caries. Given the findings of the study, full-scale R&D efforts should be directed into the development of dentifrice containing the extract of chamaecyparis obtusa in the future.
능동 클램프형 전류원 하프브리지 컨버터의 효율 특성 분석
박진주(Jin-Ju Park),임정규(Jeong-Gyu Lim),정세교(Se-Kyo Chung),송유진(Yujin Song) 전력전자학회 2011 전력전자학술대회 논문집 Vol.2011 No.7
An active-clamped current-fed half-bridge converter is used for front-end converter for grid-connection of low voltage energy sources. In this paper, theoretical analysis on the loss and efficiency for an active-clamped current-fed half-bridge converter is presented. To analyze the loss of the presented converter, the RMS current of each device is derived and it’s loss is calculated. The comparison between simulation result and computed value is presented to verify the validity of the theoretic results.
온라인 수업에 대한 교수자와 학습자의 인식 및 요구도 분석: P 대학 사례를 중심으로
박진주 ( Jin-ju Park ),김은정 ( Eun-jung Kim ) 한국교육정보미디어학회(구 한국교육정보방송학회) 2021 교육정보미디어연구 Vol.27 No.1
본 연구의 목표는 대학 온라인 수업에 대한 인식 및 요구분석을 실시함으로써 효과적인 온라인 수업 체제 구축을 위한 시사점을 얻는 데 있다. 이를 위해 부산 소재의 P국립대학 재학생과 교수자를 대상으로 온라인 설문조사를 실시하였으며, 온라인 수업 전반에 대한 학습자, 교수자의 인식과 요구를 조사하였다. 최종적으로 교수자 161명과 학습자 2,599명이 설문에 응답하였으며, 자료 분석 방법은 다음과 같다. 인식분석은 기술통계를 활용한 빈도분석을 실시하였으며, 요구도 분석은 첫째, t검증을 통해 바람직한 수준과 현재수준의 차이를 통계적으로 검증하였으며, 둘째, Borich의 요구도 공식을 사용하여 우선순위를 도출하였다. 셋째, The Locus for Focus 모델을 활용하여 요구도를 4분면 좌표평면을 이용하여 제시하였으며 넷째, 이를 종합하여 최우선순위 항복과 차 우선순위 항목을 도출하였다. 연구결과 학습자와 교수자에 따라 온라인 수업에 대한 인식 및 요구에 공통점과 차이점이 발견되었다. 연구 결과를 요약해 보면, 인식조사의 경우 온라인 수업의 미래에 대해 교수자보다 학습자가 더 열려있는 태도를 보이고 있음을 확인할 수 있었으며 교수자의 경우 상호작용이 용이한 실시간 수업을, 학습자의 경우 원하는 시간에 반복학습을 할 수 있는 동영상 수업을 선호하는 것으로 나타났다. 요구조사의 경우 최우선순위 항목은 4가지로 온라인 학습에 대한 객관적이고 공정한 평가, 교수자의 인프라활용 능력, 학습자의 열정, 교수자와 학습자의 상호작용과 피드백으로 도출되었다. 본 연구에서 도출된 결과를 바탕으로 시사점과 추후 연구에서의 제언이 논의되었다. The purpose of this study is to suggest implications for establishing an effective online class system by conducting perception and needs analysis of university online classes. To this end, an online survey was conducted on students and professors at P National University in Busan, and the perceptions and needs of the students and professors of the entire online class were investigated. Finally, 2,599 students and 161 professors responded to the survey, and the method of data analysis was as follows. The perceptions analysis was conducted using descriptive statistics, and the needs analysis was first statistically verified by t-test, and second, the priority was derived using Borich's demand formula. Third, the Locus for Focus model was utilized to present the needs using a 4-minute coordinate plane, and fourthly, it was aggregated to derive the top priority and the next priority items. Studies have found commonalities and differences in the perceptions and needs of online classes, depending on learners and professors. In summary of the findings, first of all, in the case of perceptions analysis, the learners were more open to the future of online classes than the professors. It was also found that the professors prefer real-time classes that are easy to interact with the learners, and the learners prefer pre-recorded online classes that they can watch videos repeatedly at any time. For the needs analysis, there were four top priority items: objective and fair evaluation of online learning, the ability of professors to utilize infrastructure, learners' enthusiasm for the class, and the feedback of professors to learners and the interaction with them. Implications and suggestions for following studies have been discussed based on the result.
교과서 분석과 설문조사를 통한 고등학교 듣기 전 활동 양상 분석
박진주 ( Jin Ju Park ) 한국중등영어교육학회 2008 중등영어교육 Vol.1 No.1
This study examined the aspects of pre-listening activities in twenty five high school textbooks and surveyed opinions of teachers and students regarding pre-listening activities. The result of the text book analysis showed that the diversity of pre-listening activities was narrow, and certain activities were dominant. The teachers and students also agreed that textbooks should provide awide variety of pre-listening activities to ensure the efficiency of listening instruction. The teachers were well aware of almost all types of the pre-listening activities, and most of them have experiences of implementing them in class. Yet the time allotted for the pre-listening activities during class was very short because of time constraints. The students were not well aware of the pre-listening activities, but they viewed the effect of them favorably. In addition, both teachers and students responded that pre-listening activities positively influence the improvement of listening ability.