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김기영,김준섭,이응봉,오세훈,김형각,정진한 한국문헌정보학회 2016 한국문헌정보학회지 Vol.50 No.3
The aim of this study is to develop a plan for university library evaluation with factors and their systems, and an evaluation process, based on the Korean University Library Promotion Act. This study adopts a consensus based method including open-ended interviews with various stakeholders around university libraries, a questionnaire survey, a public hearing, and numerous discussions with the stakeholders. Balanced Scorecard is adopted as a basic framework for the development of evaluation system, provides a balanced perspective on the whole aspects in the university library management, including factors and performances in the management, The proposed plan in this study is expected to help to examine whether the resources are used for reaching the goals in the libraries, and to contribute the growth of the university libraries. 본 연구는 대학도서관진흥법에 따른 대학도서관 운영평가를 실시하기 위한 평가요소와 평가체계안을 개발하는 데에 그 목적이 있다. 이를 위해 대학도서관 내․외부의 전문가, 실무자 등 다양한 이해관계자들을 대상으로 심층면담, 설문조사, 공청회, 토론 등을 실시하여, 합의를 바탕으로 연구를 진행하였다. 평가항목 구성안은 균형성과표(Balanced Scorecard)에 기반을 두고 개발되었으며, 대학도서관 운영 전반에 걸친 요소와 성과에 대한 균형 잡힌 관점을 제공하였다. 제안된 대학도서관 운영평가안이 도서관의 가용 자원이 목표달성 활동을 위해 사용되고 있는지를 검토하게 함으로써 대학도서관 발전에 기여할 수 있기를 기대한다.
생산년도 및 계통에 따른 식용피의 페놀성분 및라디칼 소거활성
우관식,고지연,이재생,윤영호,김기영,정헌상 忠北大學校 農業科學硏究所 2015 農業科學硏究 Vol.31 No.1
This study investigated the changes of antioxidant compounds and antioxidant activity of barn yard millet according to production years and variety to improve the availability. Proximate and minerals compositions of barnyard millet did significantly change with production years and variety. The moisture, crude protein, fat, ash, and carbohydrate contents of barnyard millets were 5.60~8.19, 6.91~9.63, 4.41~5.32, 2.91~3.51, and 75.26~78.19 g/100 g, respectively. The K, Ca, Mg, and Na contents were 391.17~888.24 12.05~41.94, 165.72~327.20, and 17.43~46.06 mg/100 g, respectively. Total polyphenol and flavonoid contents of barnyard millets with production years and variety were 206.97~394.88 mg GAE/100 g sample and 9.38~59.41 mg CE/100 g sample, respectively. DPPH and ABTS radical scavenging activities were 121.35~344.05 and 277.48~617.14 mg TE/100 g sample, respectively. Total polyphenol and flavonoid contents, and radical scavenging activity of barnyard millet did significantly change with production years and variety. In the results, the availability of barnyard millet as coarse cereals is thought to be higher.
품종에 따른 수수 메탄올 추출물 및 용매분획물의 항산화활성
우관식, 김정인, 고지연, 이재생, 송석보, 정태욱, 김기영, 곽도연, 오인석, 정헌상 忠北大學校 農業科學硏究所 2013 農業科學硏究 Vol.29 No.1
The purpose of this study was to evaluate the antioxidant contents and activities of solvent fractions from methanolic extracts of sorghum according to varieties. The cultivated varieties were Hwanggeumchal-susu (HS), Milo-susu (MS) and Jungmo 4001 (JM4). The yield of methanolic extract of HS was 4.37%, whereas those of its solvent fractions (hexane, chloroform, ethyl acetate, butanol, and water) were 8.82, 2.46, 5.24, 24.49, and 47.23%, respectively. The highest total polyphenol, flavonoid, tannin, and proanthocyanidin contents of methanolic extracts (ME) were 30.33 mg GAE/g ME, 4.69 mg CE/g ME, 25.86 mg TAE/g ME, and 675.09 μg CE/g ME from HS, respectively. The highest total polyphenol and flavonoid contents of solvent fractions (SF) were 52.87 mg GAE/g SF and 18.86 mg CE/ g SF in ethyl acetate fraction of HS, respectively. The highest total tannin and proanthocyanidin contents of solvent fractions were 39.27 mg TAE/g SF and 1210.74 μg CE /g SF in the butanol fraction of HS, respectively. The highest DPPH and ABTS radical scavenging activities of the solvent fractions were 20.54 and 33.85 mg TE/g SF in ethyl acetate fraction of HS, respectively. The highest catalase activity of the solvent fractions was 67.92 nmol/min/mL in ethyl acetate fraction of HS. The superoxide dismutase- like activities of methanolic extracts from HS, MS and WS were 20.22, 20.00 and 3.14 unit/mL, respectively. The results of this study show that notable antioxidant activities in sorghum flowers have significant health benefits.
정연서 ( Youn-seo Jeong ),은성경 ( Sung-kyong Un ),김기영 ( Ki-young Kim ) 한국정보처리학회 2006 한국정보처리학회 학술대회논문집 Vol.13 No.2
휴대용 단말기기의 보급 및 사용이 컴퓨터와 비교하여 4배나 더 크게 증가하고 있으며 이러한 증가 추이는 앞으로도 계속 될 것으로 시장조사기관들의 자료에서 나타나고 있다. 무선환경의 확대와 더불어 이러한 휴대용 단말들은 통신을 지원하고 네트워크에 연결되어 사용될 것이다. 수년전부터 무선환경에 대한 취약점이 보고되고 이들을 대상으로 하는 공격과 피해가 나타나고 있으며, 근래 모바일 단말기기들에 대한 악성코드의 출현들이 많이 보고되고 있다. 본 논문에서는 먼저, 현재 나타나고 있는 모바일 악성코드(바이러스, 웜, 트로이목마 등)들의 종류와 특성들을 조사하고 감염경로와 피해유형들을 살펴본다. 그리고, 휴대용 모바일 기기들의 사용형태와 취약점들을 조사하여 휴대용 단말기기에 사용되는 임베디드 운영체제에서 갖추어야 할 보안요구기능들을 분석하고 제시한다.
정현석,Yonmin Park,나창운,이재철,김기영,이선영 한국섬유공학회 2021 Fibers and polymers Vol.22 No.1
Polyether sulfone (PES), which is a thermoplastic polymer, was added as a toughening agent to a bisphenol-A typeepoxy resin to form a matrix of carbon-fiber-reinforced composites (CFRPs). For benchmarking, carboxyl-terminatedbutadiene acrylonitrile (CTBN), which is a rubber-based toughening agent, was added to the epoxy resin. The mechanicaland thermal properties of the PES- and CTBN-toughened epoxy resins were compared. Dicyandiamide (DICY) was used asthe hardening agent, whereas 3-(3,4-dichlorophenyl)-1,1-dimethylurea (DCMU) was used as the hardening accelerator. Inaddition, 4,4′-diamino diphenyl sulfone (DDS) was added to improve the dispersibility of PES in the epoxy resin. TheCTBN-toughened epoxy resin exhibited improved impact strength and fracture toughness, but decreased tensile strength,tensile modulus, and glass transition temperature (Tg). The fracture toughness and Tg values of the PES-toughened epoxyresins increased with increasing amount of added PES. However, the tensile moduli and Tg values of the epoxy decreasedupon addition of CTBN. The tensile and impact strengths of the specimen toughened with 10 phr PES increased by 14 % and106 %, respectively, compared to those of the PES un-toughened epoxy resin. The ductility factor of the resin improved withincreasing PES content. CTBN formed microvoids and CTBN particles within the epoxy matrix, which improved the fracturetoughness of the resin, but deteriorated its tensile properties by stress concentration. In contrast, PES improved the propertiesof the epoxy resin. This was attributed to PES being well dispersed within the epoxy matrix, thereby absorbing the energyrequired for crack propagation. Hence, owing to their excellent mechanical properties, the PES-toughened epoxy resins weredetermined suitable for use as matrices for CFRPs.