Microstructure and Electrical Property of Epoxy/Graphene/MWCNT Hybrid Composite Films Manufactured by UV-Curing

정영규,안지은 한국고분자학회 2014 Macromolecular Research Vol.22 No.10

UV-cured epoxy hybrid composite films were manufactured by efficient and facile cationic photochemicalpolymerization of 3,4-epoxycyclohexylmethyl-3',4'-epoxycyclohexane carboxylate mixtures including 5.0 wt%carbon nanofillers of different graphene/multi-walled carbon nanotube (MWCNT) compositions of 10/0, 9/1, 7/3,5/5, 3/7, and 0/10 by weight ratio. TEM images confirmed that the mixed carbon nanofillers of graphene andMWCNT were well dispersed in the UV-cured epoxy matrix, while MWCNT as a single carbon nanofiller componentwas aggregated in the matrix. The electrical resistivity of the composite films was thus varied with the incrementof the relative MWCNT content in 5.0 wt% carbon nanofillers, i.e., ~160 Ωcm for the epoxy/graphene composite film,30~80 Ωcm for the epoxy/graphene/MWCNT composite films, and ~16,200 Ωcm for the epoxy/MWCNT compositefilm. The decreased electrical resistivity of the epoxy/graphene/MWCNT composite films was associated withthe interconnected network formation of graphene sheets and MWCNTs. Thus the UV-cured epoxy/graphene andepoxy/graphene/MWCNT composite films exhibited excellent electric heating performance in terms of rapid temperatureresponse, stable maximum temperature, and high electric power efficiency. In addition, the UV-cured epoxyhybrid composite films as electric heating materials were found to be thermally stable up to ~290 ℃.

생활체육으로서 해양스포츠의 가치 탐구

정영규,이형일 한국융합학회 2018 한국융합학회논문지 Vol.9 No.7

삶의 방식 및 환경의 변화로 생활체육의 수요가 증가하고 있으며 해양스포츠 활동의 기회확대로 인해 해양스포츠 인구도 빠르게 증가하고 있다. 이에 본 연구는 해양스포츠가 가지고 있는 생활체육으로서의 가치를 문헌연구를 통해 탐구하였다. 탐구 결과, 해양스포츠는 여가만족, 복지기능과 같이 생활체육이 가지고 있는 삶의 질 향상을 위한 도구로서의 기능적 가치를 포함하고 있으며 개인의 삶에 긍정적인 영향을 미칠 뿐만 아니라 나아가 사회적 행복수준을 높이는데 기여할 수 있다. 또한, 해양스포츠는 자연을 활용한 직접경험 신체활동으로서 인간이 자연을 이해하는데 중요한 기능을 가지고 있으며 특히, 비현실적 여가활동이 대부분을 차지하고 있는 현대사회의 청소년들에게 올바른 인격을 형성시킬 수 있는 정서 교육적 가치가 높다는 것을 확인할 수 있었다. 이는 해양스포츠가 생활체육이 가지고 있는 다양한 가치 이상의 긍정적 가치들을 내포하고 있으며 생활체육으로서의 충분한 가치가 있음을 의미한다고 할 수 있다. As the participation in marine sports activities has increased according to the increased national income, changes in lifestyle, etc., this study explored various values and possibilities towards a sport for all, which are inherent in marine sports, through the literature research with respect to leisure activities, sport for all, and marine sports. As a result of study, marine sports include the functional values, such as leisure satisfaction and welfare function, as a tool to improve the quality of life, which the sport for all may have, and not only have a positive impact on individual lives, but further, can also contribute to raising the level of social well-being. Marine sports are directly experienced physical activities utilizing nature and importantly functioning in human beings’ understanding nature; especially, it could be found that they have the high emotion-educational value which could make the right personality formed for the adolescents in modern society, whose unrealistic leisure activities account for the most part of their leisure time. These results suggest that marine sports contain sufficient positive values and possibilities as a sport for all, and the value as a sport for all could be realized which marine sports may have through active participation.

무선 단말기 Fingerprint 식별을 위한 딥러닝 구조 개발

정영규,신학철,나선필 한국인터넷방송통신학회 2022 한국인터넷방송통신학회 논문지 Vol.22 No.1

Radio frequency fingerprinting refers to a methodology that extracts hardware-specific characteristics of a transmitter that are unintentionally embedded in a transmitted waveform. In this paper, we put forward a fingerprinting feature and deep learning structure that can identify the same type of Digital Mobile Radio(DMR) by inputting the in-phase(I) and quadrature(Q). We proposes using the magnitude in polar coordinates of I/Q as RF fingerprinting feature and a modified ResNet-1D structure that can identify them. Experimental results show that our proposed modified ResNet-1D structure can achieve recognition accuracy of 99.5% on 20 DMR. RF-Fingerprint 기술은 전송된 파형에서 송신기의 하드웨어 고유 특성을 추출하는 기술로써, 디바이스 보안분야에 매우 유용한 기술 중의 하나이다. 본 논문은 무선 단말기의 In-phase(I)와 Quadrature(Q) 값을 입력으로 동종무선 단말기 및 이기종 무선 단말기를 식별할 수 있는 fingerprint 특징을 추출하고 이를 식별할 수 있는 딥러닝 구조를제안한다. 동종/이기종 무선 단말기를 식별하기 위한 특징으로 I/Q를 극좌표로 변환한 후 크기 값을 시간축으로 배열한데이터를 무선 단말기의 fingerprinting 특징으로 제안하고 이를 식별하기 위해서 수정된 1차원 ResNet 모델을 제안한다. 실험을 위해서 동일 모델 10대의 두 종류 무선 단말기를 대상으로 제안한 딥러닝 구조의 성능을 분석한다. 제안한딥러닝 구조 및 fingerprint 특징의 성능 검증을 위해서 4000개의 데이터셋 중에서 20%인 800개 데이터셋을 이용하여성능 분석한 결과 약 99.5%의 식별 성능을 보였다.

Segmental Motions and Associated Dynamic Mechanical Thermal Properties of a Series of Copolymers Based on Poly(hexamethylene terephthalate) and Poly(1,4-cyclohexylenedimethylene terephthalate)

정영규,이상철,조원호 한국고분자학회 2006 Macromolecular Research Vol.14 No.4

The dynamic mechanical thermal properties of poly(hexamethylene terephthalate) (PHT), poly(1,4-cyclohexylenedimethylene terephthalate) (PCT) and their P(HT-co-CT) random copolymers in the amorphous state were examined as a function of temperature and frequency. All the samples exhibited two main relaxation processes in the plot of tan δ versus temperature: the primary α-relaxation associated with the glass transition and the second ary β-relaxation attributed to the local segmental motions of mostly cyclohexylene rings for PCT and to cooperative motions of methylene, carboxyl, and phenylene groups for PHT. Both α- and β-relaxation temperatures increased with increasing CT content. The activation energy of the α-relaxation increased with increasing CT content, whereas that of the β-relaxation decreased. The sub-glassy secondary β-relaxation processes of PCT and PHT were investi gated in terms of the cooperativity of main-chain segmental motions.

Preparation, Structure and Properties of Poly(p-phenylene benzobisoxazole) Composite Fibers Reinforced with Graphene

정영규,백두현,장진우,민병길,윤관한 한국고분자학회 2014 Macromolecular Research Vol.22 No.3

Graphene-reinforced poly(p-phenylene benzobisoxazole) (PBO) composite fibers were manufactured viadry-jet wet-spinning of PBO/graphene mixtures in poly(phosphoric acid) (PPA), which were reaction products preparedby the in situ polymerization of 4,6-diaminoresorcinol dihydrochloride and terephthaloyl chloride in the presence ofPPA solvent and exfoliated graphene sheets. The content of graphene sheets in the as-spun fibers was adjusted to0.0~2.0 wt%. The molecular structure, crystalline order, and morphology of the as-spun fibers of pristine PBO andPBO/graphene composites were identified using FTIR, X-ray diffraction, and electron/optical microscopy. The thermalstability and tensile mechanical properties of the composite fiber with 0.2 wt% graphene were found to be significantlyimproved compared to the pristine PBO fiber.

Development of Korean Cultural Contents Industry Strategy against Thailand Market Expansion of European Industry

정영규 한국글로벌문화학회 2017 글로벌문화연구 Vol.8 No.3

In this study, it is increasing economic exchanges with Thailand and the Europe's industry to continue to expand into the Southeast Asian nation's economic exchanges to be enabled. Recently they sought to investigate ways of cooperation accompanied the Buddhist country of Thailand also Korea industry in the religious and cultural content. With these countries due to the market expansion of trade and the European industry, indirect effect is sales increase of products which have close relation with Korean Wave industry. The EU intend to cultural marketing strategy when entering the Thailand market. Because their investment come with only not the auto industry, but also the content of the related fields extended culture. The expansion of the European is growing demand to change the very culture content industry in Thailand. However, because the relationship would appear that Korean Wave collaboration with the growth of the European culture according to European Automobile market expansion. Korean also makes many efforts on culture industry activation in order to enhance country competitiveness in cultural dimension. Through the promotion of cooperation with these countries, Korea CCI (cultural content industry) to zoom in Korea, it is seeking to enlarge the European automotive industry and this strategy requires of Shared Growth. This proactive approach is needed to enter the market changes of the Korea Culture & Content Plan and linked to automotive markets, coupled with the future expansion of the European automotive industry, also. in order for cultural contents industry to secure country competitiveness in world market, workforce, technology, creativity and foundation. In terms of this research, first we look at the meaning linked to activation measures and requirements of the European production car with CCI. First, according to the European automotive market expansion, change of culture is required contents of Korea. Second, to promote Korea's cultural content industry should be a priority among European automotive industry and economic cooperation.

동남아시아 이슬람 국가의 문화콘텐츠산업 시장 특성 및 성장가능성 전망 : 인도네시아와 말레이시아를 중심으로

정영규,정선화 對外經濟政策硏究院 地域情報센터 2011 연구보고 Vol.2011 No.-

A Comparative Study on Tourism Industries between Malaysia and Korea

정영규 한국문화산업학회 2009 문화산업연구 Vol.9 No.2

무선단말기 RF-fingerprinting 특징의 비지도 클러스터링을 위한 차원축소 알고리즘 연구

정영규,신학철,나선필 한국인터넷방송통신학회 2023 한국인터넷방송통신학회 논문지 Vol.23 No.3

RF-fingerprint를 이용한 클러스터링 기술은 전송 파형에 포함된 송수신기의 특성(signature)을 추출하고 이들에게 임의의 레이블을 자동으로 할당함으로써, 추후 지도 학습기반에 무선단말기 분류기의 개발을 용이하게 해준다. 동종 무선 단말기 분류를 위한 RF-fingerprint 특징 추출 알고리즘의 출력은 512개 또는 1024개 이상의 고차원 특징이다. 이러한 고차원의 특징을 분류기에는 효과적일 수 있으나 클러스터링 알고리즘의 입력으로는 부적절하다. 이에 본논문은 다차원의 RF-fingerprinting 특징을 무선단말기의 fingerprinting 특징을 유지하면서 차원을 효과적으로 줄일수 있는 차원 축소 알고리즘을 제안하고, 축소된 차원을 효과적으로 클러스터링할 수 있는 클러스터링 알고리즘을 제안한다. 제안된 RF-fingerprinting 클러스터링 알고리즘은 다차원 RF-fingerprinting 특징을 KL Divergence 기반에t-SNE를 이용하여 차원을 축소하고 DPC(Density Peaks Clustering)를 이용하여 클러스터링 수행한다. 무선단말기클러스터링 알고리즘의 성능 분석은 모토롤라XiR 10대와 윈어텍 N-Series 10대에서 수집한 3000개의 데이터셋을 이용한다. RF-fingerprintining기반 클러스터링 알고리즘의 성능 분석 결과 20개의 클러스터가 형성되었고, Homogeneity, Completeness, V-measure 모두 99.4%의 성능을 보였다.

APR1400 RCB 해체 공정 개발

정영규 한국방사성폐기물학회 2016 한국방사성폐기물학회 학술논문요약집 Vol.2016 No.10