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A Simulation and Property Analysis according to Electromagnetic Wave Absorber Shape
권석훈,황현석,강현일 한국인터넷방송통신학회 2018 International Journal of Internet, Broadcasting an Vol.10 No.4
The property of magnetic field and properties of EMW(Electro Magnetic Wave) absorption with multi-shaped EMW absorber was simulated. As a magnetic field having high density was showed at bottom of EMW absorber, simulation showed that overall EMW was absorbed at the bottom of multi-shaped absorber. The absorption properties of EMW according to thickness of absorber showed that it enhanced about 50-60 percent. Also, EMW absorption properties was checked with surface area of EMW absorber. A cylinder-shaped EMW absorber exhibited good property among multi-shaped EMW absorber based on these result.
백서 두개골 실험적 결손부에서 Para-Dioxanone 차단막의 골조직 재생 효과
권석훈,석헌주,김종관,정한성,문익상,Kwon, Suk-Hoon,Suk, Hun-Joo,Kim, Chong-Kwan,Jeong, Han-Sung,Moon, Ik-Sang 대한치주과학회 2003 Journal of Periodontal & Implant Science Vol.33 No.1
The major goals of periodontal therapy are the functional regeneration of periodontal supporting structures already destructed by periodontal disease as well as the reduction of signs and symptoms of progressive periodontal disease. There have been many efforts to develop materials and therapeutic methods to promote periodontal wound healing. Bone graft & guided tissue are being used for the regeneration of destroyed periodontium these days. Non-resorbable membranes were used for Guided tissue regeneration in early days, however more researches are focused on resorbable membranes these days. The aim of this study is to evaluate the osteogenesis of paradioxanone membrane on the calvarial critical size defect in Sprague Dawley rats. An 8 mm diameter surgical defect was produced with a trephine bur in the area of the midsagittal suture. The rats were divided into three groups: Untreated control group, Biomesh(R) group and paradioxanone group. The animals were sacrificed at 4, 8 and 12 weeks after surgical procedure. The specimens were examined by histologic, histomorphometric analyses. The results are as follows: 1. In histological view on Biomesh(R), no visible signs of resorption was observed at 4 weeks but progressive resorption was observed at 8 weeks through 12 weeks. Paradioxanone membrane expanded at 4 weeks, and rapid resorption was observed at 8 weeks. In both the membranes, inflammatory cells were observed around them. Inflammatory cells decreased with time but were still present at 12 weeks. More inflammatory cells were observed in paradioxanone membranes than in Biomesh(R) membrane. 2. The area of newly formed bone in the defects were 0.001${\pm}$0.001, 0.006${\pm}$0.005, 0.002${\pm}$0.003 at the 4 weeks, 0.021${\pm}$0.020, 0.133${\pm}$0.073, 0.118${\pm}$0.070 at the 8 weeks and 0.163${\pm}$0.067, 0.500${\pm}$0.197, 0.487${\pm}$0.214 at the 12 weeks in the control group, Biomesh(R) group and experimental group respectively. Compared to the control group, Biomesh(R) group displayed significant differences at 4,8, and 12 weeks and the paradioxanone group at 8 and 12 weeks.(P<0.05)
권석훈,강현일 대한전기학회 2019 전기학회논문지 P Vol.68 No.2
In this work, utilized carbon nanowall is promising material widely applied in electrochemistry due to its advantages that are wide surface and outstanding electrical properties. Typically, carbon nanowall is synthesized by metal catalyst free-based PECVD as simple synthesis process. But, it has high defect due to high reliance of c-radical and absence of metal catalyst. To reduce defect occurred during PECVD-based carbon nanowall synthesis, we worked by adjusting reaction gas ratio by CH4 gas. And then, the carbon nanowall synthesized by PECVD was analyzed though SEM, Raman spectra and HEMS. Upon inspection on carbon nanowall synthesized depend on reaction gas ratio, it was observed with electrical-structure variation without appearance variation. As a result, we presented signification of findings as well as optimal reaction gas ratio for carbon nanowall synthesis.
백서두개골 결손부에서 Escherichia coli 발현 시스템으로 생산된 rhBMP-2의 골형성 효과
권석훈,임현창,최경희,김민수,이지현,정의원,윤정호,김창성,최성호,조규성,Kwon, Suk-Hoon,Lim, Hyun-Chang,Choi, Kyung-Hee,Kim, Min-Soo,Lee, Ji-Hyun,Jung, Ui-Won,Yun, Jeong-Ho,Kim, Chang-Sung,Choi, Seong-Ho,Cho, Kyoo-Sung 대한치주과학회 2009 Journal of Periodontal & Implant Science Vol.39 No.1
Purpose: Recombinant human bone morphogenetic protein-2(rhBMP-2) has been evaluated as potential candidates for periodontal and bone regenerative therapy. In spite of good prospects in BMP applications, there is economically unavailable for clinical use in dental area. The purpose of this study was to evaluate the osteogenic effect of rhBMP-2 produced by E.coli expression system. Materials and methods: Eight-mm critical-size calvarial defects were created in 48 male Sprague-Dawley rats. The animals were divided into 6 groups of 8 animals each. Each group received one of the following: Negative control(sham-surgery control), positive control(absorbable collagen sponge(ACS) alone) and experimental(ACS loaded with rhBMP-2). Defects were evaluated by histologic and histometric parameters following 2- and 8-week healing intervals. Results: The experimental group showed significant defect closure at 2 and 8weeks than the sham surgery and positive control groups. Moreover, the experimental group showed significantly greater new bone and augmented area than the other groups at both 2 and 8weeks. Conclusion: rhBMP-2 produced by E.coli expression system may be effective for bone regeneration.
플랙시블 기판 위에 성장시킨 CNW 박막의 가스비에 따른 구조적 전기적 특성 분석
권석훈(Seok-hun Kwon),황현석(Hyun-Suk Hwang),강현일(Hyun-il Kang) 대한전기학회 2021 전기학회논문지 Vol.70 No.12
Microwave plasma enhanced chemical vapor deposition (PECVD) can offer high purified carbon materials, such as graphene, carbon nanotube, and carbon nanowall. Among them, carbon nanowall is grown from nucleation on substrate at comparatively low temperature because it need not catalyst materials. Instead, ratio by contents of gas is very significant. Herein, we report change in structural and electrical properties of carbon nanowall through gas ratio that is varied contents of two reaction gas. In FE-SEM analysis, carbon nanowall showed two-typed morphology and the number of pores with pore’s scale was different with increase of hydrogen gas flow rate. In FE-SEM analysis, two geometric morphology of carbon nanowall were confirmed with pore"s scale that was varied depending on gas ratio. Raman spectra consisting of D, G, and 2D bands showed that carbon nanowalls were pure carbon materials and composed with multi-layered vertical graphene sheets. In addition, carbon nanowalls were uniformly grown on polyimide film in each condition of gas ratio. Moreover, electrical characteristic was changed according to morphology and molecular structure of carbon nanowall via gas ratio.
XML 기반의 제안서 접수 및 평가 시스템의 설계 및 구현
권석훈(Seok-Hun Kwon),나재열(Jae-Yeol Na),유정연(Jeong-Yeon Yu),이강찬(Kang-Chan Lee),이규철(Kyu-Chul Lee) 한국정보과학회 2001 한국정보과학회 학술발표논문집 Vol.28 No.1B
기존의 제안서 접수 및 평가 방식은 수작업이 대부분을 차지하여 많은 인력과 시간이 소요되며 정확성도 완전히 보장할 수 없는 단점을 가지고 있다. 이러한 비효율적인 방식을 개선하기 위해서 접수 및 평가 과정을 웹상에서 자동화하여, 문서 작성자, 접수자, 평가자 및 관리자들이 좀 더 편리하게 관련 작업을 처리할 수 있게 하였다. 자동화를 도입하기 위한 방법으로 HWP 문서의 구조 정보를 표현할 수 있는 마크업(markup) 언어인 HWPML (HWP Markup Language : 이하 HML)을 사용하였으며, HML 문서를 파싱(parsing)하여 필요한 정보만을 추출하여 XML (eXtensible Markup Language) 문서를 생성하였다. 이렇게 생성된 XML 문서는 논리적인 구조 정보를 가지고 있고 플랫폼 및 소프트웨어 중립적이기 때문에 효과적인 검색, 관리 및 공유가 가능한 시스템 환경을 제공한다. 이 기법으로 표준 언어로 부각되고 있는 XML 형태의 문서 관리를 기존의 워드 프로세서 형태의 문서 관리에 확장 적용할 수 있다. 본 논문에서는 이러한 자동화 시스템의 구조와 문서 변환 기법을 제안하였다.