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조기강도 개선형 시멘트 및 초기수화 촉진 혼화제를 사용한 콘크리트의 조기압축강도 발현특성 평가
박규연,김규용,최경철 한국건축시공학회 2014 한국건축시공학회지 Vol.14 No.4
In this study, revelation performance of concrete at early age according to types of cement, water reducing ratio ofhigh performance superplasticizer and mixing of accelerator for early hydration was examined aiming for reduction ofconstruction period of framework through securing strength at early age of concrete. It was observed that strength atearly age, 5MPa in 12hours, 14MPa in 18hours, is secured by early strength improvement type cement and usingpromotion admixture for early hydration which are Sodium persulfate, Potassium hydroxide. Therefore cost reduction isexpected to be possible in construction site by reducing construction period of frame work. 본 연구에서는 콘크리트의 조기강도 확보를 통해 골조공기를 단축하는 것을 목표로 하여 시멘트 종류, 고성능감수제의 감수율, 초기수화 촉진 혼화제의 혼입에 따른 콘크리트의조기강도 발현성능을 검토하였다. 조기강도 개선형 시멘트와 Sodium persulfate, Potassium hydroxide의 초기수화 촉진물질에 의해 12시간에 5MPa, 18시간에 14MPa의조기강도를 확보할 수 있는 것으로 나타났다. 이를 통해건설현장에서 거푸집의 골조공기를 단축시켜 원가절감이가능할 것으로 기대된다.
조기강도 개선형 시멘트를 사용한 콘크리트의 조기강도 발현 특성
박규연,김용로,김규용 한국건축시공학회 2013 한국건축시공학회지 Vol.13 No.3
In this research, early strength development performance of early strength improvement type ordinary cement which is economically feasible early strength cement(Type III), improved early strength ordinary cement(Type I), was estimated to derive minimum curing temperature and proper water to cement ratio according to cement for early strength development through examination of fresh concrete properties and compressive strength according to water to cement ratio curing 10℃, 15℃ and 20℃ to suggest fundamental data for practical use of early strength concrete. 본 연구에서는 3종 조강시멘트에 비해 경제성을 개선하고, 1종 보통포틀랜드시멘트에 비해 조강성능을 개선한 조기강도 개선형 시멘트를 사용한 조강콘크리트의 양생온도및 물시멘트비에 따른 굳지 않은 콘크리트 특성 및 조기강도 발현 특성을 검토함으로써, 이를 활용한 조강콘크리트의실용화를 위한 기초자료를 제시하고자 하였다.
Effect of tar compounds on the purification efficiency of paclitaxel from Taxus chinensis
박규연,김건중,김진현 한국공업화학회 2015 Journal of Industrial and Engineering Chemistry Vol.21 No.1
We investigated the effect of tar compounds on the purification efficiency of paclitaxel from Taxuschinensis and evaluated the adsorbent for their removal. The tar compounds had an adverse effect onthe purifying process in increasing order of 1-methylnaphthalene, o-xylene < acenaphthene < 2-picoline < 2,5-xylenol. As a result of adsorbent treatment, HP20 gave the highest yield (97.8%) and purity(44.7%) of paclitaxel. The highest removal (85.2%) of major tar compounds in biomass was also obtainedthrough adsorbent treatment with HP20. The purification efficiency of paclitaxel by adsorbent treatmentincreased as the removal of tar compounds increased.
李一洙,朴圭延 群山大學校 1992 論文集 Vol.19 No.-
In this essay, I tried to make it clear that Kierkegaard knew clearly that to found his concept of existence and his discription of existence of the philosophical ontology is important, and that he developed secretely that ontology in his pseudonymous writings. Accordingly, I tried to rebuild that ontology from Kierkegaard's pseudonymous writings about the self, and to study the structure and the dynamism of the self.
자율전공학부 학생의 진로성숙도, 전공선택 프로그램 만족도, 자율전공학부 만족도 간의 관계
박혜영,박규연 학습자중심교과교육학회 2024 학습자중심교과교육연구 Vol.24 No.4
목적 본 연구의 목적은 자율전공학부 학생의 진로성숙도, 전공선택 프로그램 만족도, 자율전공학부 만족도의 관계를 살펴보고 자율전공학부 만족도를 높이는 방안을 탐색하는 데 있다. 방법 본 연구를 위해 전북 소재의 K대학의 132명의 자율전공학부 학생을 대상으로 진로성숙도, 전공선택 프로그램 만족도, 자율전공학부 만족도 설문을 실시하였고 수집된 114건의 자료를 Stata IC 14를 사용하여 t-test, 상관분석, 회귀분석을 실시하였다. 결과 본 연구를 통해 도출된 연구결과는 다음과 같다. 첫째, 전공선택 프로그램 중 책임지도교수와의 상담에서 전공을 선택한 학생과 전공을 선택하지 않은 학생 간의 유의한 차이가 나타났다. 이는 학생에게 의미있는 진로지도와 학사지도를 제공하는 전문적인상담지원이 필요함을 의미한다. 둘째, 진로성숙도는 자율전공학부 만족도와 상관관계 없음이 나타났다. 이는 자율전공학부를 선택하는 학생이 진로를 결정하고 진로를 준비하는 진로성숙도가 낮음을 의미한다. 이에 진로성숙 교육프로그램 및 상담 프로그램 개발및 제공이 필요하다. 셋째, 자율전공학부 만족도에 영향을 미치는 프로그램은 특강과 심리상담으로 나타났다. 자율전공학부 학생의자기효능감 및 동기부여를 담당하는 전문상담교수가 필요하다. 결론 이와 같은 연구결과를 바탕으로 자율전공학부 만족도를 향상시키기 위한 논의와 시사점을 제시하고 연구의 일반화를 위한 후속연구를 제안하였다. Objectives The purpose of this study is to examine the relationship between career maturity, satisfaction with programs for selecting a major, and satisfaction with the major among students of the school of the liberal studies and to explore ways to increase satisfaction with the school of the liberal studies. Methods For this study, a questionnaire on career maturity, satisfaction with major selection programs, and satisfaction with the school of the liberal studies was conducted for 132 students at K University in Jeonbuk, and 114 collected data were t-test, correlation analysis, and regression analysis were conducted using Stata IC 14. Results The research results derived through this study are as follows. First, among the major selection programs, there was a significant difference between students who chose their major in counseling with the responsible adviser and those who did not. This implies the need for professional counseling support that provides meaningful career and academic guidance to students. Second, it was found that career maturity was not correlated with satisfaction with the school of the liberal studies. This means that the quality of students who choose the school of the liberal studies deciding their career path and preparing for their career path is low. Accordingly, it is necessary to develop and provide educational programs and counseling programs that can lead to career maturity. Third, special lectures and psychological counseling were found to have programs that influence the satisfaction of the school of the liberal studies. There is a need for a responsible supervisor in charge of self-efficacy and motivation for students. Conclusions Based on these research results, discussions and implications for improving the satisfaction of the school of the liberal studies were presented, and follow-up studies for generalization of research were proposed.