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김창우,강명종,Thanh Khue Van,강영수 한국공업화학회 2017 Journal of Industrial and Engineering Chemistry Vol.53 No.-
Hematite single crystals are one of most promising materials which is able to apply for the field of catalyst industry. Even its prospective applicability, strategies for improving its catalytic performance are still not enough to meet the requirements for industrial application. In the present work, we demonstrate a morphology selective one pot reaction for a hematite single crystal by microwave-assisted hydrothermal synthesis. The microwave-assisted hydrothermal route, taking advance of the exposed crystal facetbased activity of the material, is suggested to crystal facet controlling synthesis of the hematite crystal. The dispersant and capping agents such as sodium carboxymethyl cellulose and N2H4, respectively, play a very important role in controlling the exposed crystal facet and morphological uniformity for a selective morphology of hematite crystal. In addition, systematically experimental examination of the wellexposed facet is interestingly giving an insight into the crystal growth and morphological evolution of single crystalline hematite from plate to tetrahexagonal bipyramid, octahedral and oblique cubic shape. Physicochemical techniques were used to characterize and evaluate the photoactivity of the material in detail. In here, a well-defined crystal facet is obtained and expected to be applied as an efficient catalysts and its synthetic methodology is applicable to other metal oxide photocatalyst.
外來 <武道身體文化>의 流入過程을 통해본 韓國 武道의 現代的 意義
김창우,이재학,송일훈 한국사회체육학회 2007 한국사회체육학회지 Vol.0 No.31
Introduction of Foreign Physical Culture andModernistic Significance of Korean Martial Arts
항공사 조직구성원의 항공안전과 항공보안에 대한 상충적 태도가 조직효과성에 미치는 영향 연구
김창우,김기웅,박성식 한국항공운항학회 2020 한국항공운항학회지 Vol.28 No.2
This paper has studied the effect of airline staff’s perception on both aviation safety andaviation security to their organizational effectiveness. Airline staff’s perception on aviationsafety is different from that on aviation security due to organizational difference in an airline. Through an empirical analysis, it was analyzed the effect of such perceptional difference onairline’s organizational effectiveness. According to the analysis, it was found the perception ofaviation safety has a significant positive effect on organizational effectiveness. Airline staffbelieved the safety is a core value of an airline and emphasizing the safety never impeded theairline’s operation including service quality. Secondly, it was proven the perception on abidingby aviation security rules had a significant negative effect on organizational effectiveness. However, emphasizing aviation security had a very significant positive contribution on airline’sphilosophy of aviation safety. Following the research results, it was suggested an airline lookfor improving the process and regulations to deal with aviation security in the organization.
microRNA-183 is Essential for Hair Cell Regeneration after Neomycin Injury in Zebrafish
김창우,한지혁,Ling Wu,최재영 연세대학교의과대학 2018 Yonsei medical journal Vol.59 No.1
Purpose: microRNAs (miRNAs) are non-coding RNAs composed of 20 to 22 nucleotides that regulate development and differentiationin various organs by silencing specific RNAs and regulating gene expression. In the present study, we show that the microRNA(miR)-183 cluster is upregulated during hair cell regeneration and that its inhibition reduces hair cell regeneration followingneomycin-induced ototoxicity in zebrafish. Materials and Methods: miRNA expression patterns after neomycin exposure were analyzed using microarray chips. Quantitativepolymerase chain reaction was performed to validate miR-183 cluster expression patterns following neomycin exposure (500 μM for 2 h). After injection of an antisense morpholino (MO) to miR-183 (MO-183) immediately after fertilization, hair cell regenerationafter neomycin exposure in neuromast cells was evaluated by fluorescent staining (YO-PRO1). The MO-183 effect also was assessed in transgenic zebrafish larvae expressing green fluorescent protein (GFP) in inner ear hair cells. Results: Microarray analysis clearly showed that the miR-183 cluster (miR-96, miR-182, and miR-183) was upregulated after neomycintreatment. We also confirmed upregulated expression of the miR-183 cluster during hair cell regeneration after neomycin-induced ototoxicity. miR-183 inhibition using MO-183 reduced hair cell regeneration in both wild-type and GFP transgenic zebrafishlarvae. Conclusion: Our work demonstrates that the miR-183 cluster is essential for the regeneration of hair cells following ototoxic injuryin zebrafish larvae. Therefore, regulation of the miR-183 cluster can be a novel target for stimulation of hair cell regeneration.
교육감의 행정행위와 책무성에 대한 국가의 관여 방식과 기제에 관한 쟁점 분석
김창우,김규태 한국교육정치학회 2014 敎育政治學硏究 Vol.21 No.3
본 연구는 교육감의 행정행위와 책무성에 대한 국가의 관여 방식과 기제에 관한 쟁점을 분석하기 위해 수행되었다. 이와 같은 목적을 달성하고자 교육감과 교육부장관 사이에 가장 쟁점이 된 아홉 가지 사례를 분석하였다. 본 연구의 결론은 다음과 같다. 교육감의 행정행위와 책무성에 대한 쟁점은 교육감의 행정행위에 대한 불명확한 법규 내용과 그에 따른 국가와 교육감의 인식 차이에서 비롯되었다. 교육감의 행정행위에 대한 국가의 관여는 행정적 관여가 주류를 이루었지만 행정적 관여로 쟁점이 해결되지 않으면 사법적・입법적 관여를 통해 교육감의 행정 행위에 관여하고 있는 것으로 나타났다. 또한 교육감을 평가하는 책무성에 대한 국가와 교육감의 인식의 차이에 의해서 쟁점이 발생하였다. 그리고 이러한 양상은 지역주민의 여론에 의해 가장 큰 영향을 받고 있었다. 본 연구의 결론을 바탕으로 몇 가지 제언을 한다면 다음과 같다. 첫째, 교육감의 권한에 관한 모호한 법규 내용 정비가 필요하다. 둘째, 자치사무와 재량행위의 범위및 내용과 방식 등을 담고 있는 관련 법령 개정을 위한 후속연구가 필요하다. 셋째, 고객지향적 책무성에 초점을 두는 국가의 관여 방식을 재고할 필요가 있다. The purpose of this study was to analyze the educational issues on the State’s involvement and Mechanisms of the Administrative Acts and Accountability of Superintendents of Education. The findings were as follows. First, the educational issues of the administrative acts and the accountability types of the superintendents of education were derived from ambiguous provisions in the concerned rules and regulations resulting in different points of view between the state and the superintendents of education. Second, These conclusions set the course for further study clarifying the role of superintendents as prescribed in educational laws. Follow-up studies are needed to determine steps to reduce conflict between the state and the superintendents. Such work could examine the administrative acts in line with customer-driven accountability for superintendents.