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Enhanced R&D Report Retrieval System Using XML
Kwangnam Choi,YoungJu Shin,Kiman Jang,Hoekyung Jung 한국정보통신학회 2017 2016 INTERNATIONAL CONFERENCE Vol.9 No.1
Recently, there is a growing demand for easy use of non-text (pictures, tables) in electronic documents. As a result, research interest in the use and retrieval of non-text in electronic documents is increasing. In this paper, we designed and developed a system that converts electronic documents into XML and provides both element - based text retrieval and retrieval of images and tables included in electronic documents. The method proposed in this paper expresses the image and table information in XML format. Therefore, the system can be conveniently implemented using commercial systems that support XML, and the retrieval accuracy of images and tables is improved.
Infrared spectroscopic study of carrier scattering in gated CVD graphene
Yu, Kwangnam,Kim, Jiho,Kim, Joo Youn,Lee, Wonki,Hwang, Jun Yeon,Hwang, E. H.,Choi, E. J. American Physical Society 2016 Physical Review B Vol.94 No.23
<P>We measured Drude absorption of gated CVD graphene using far-infrared transmission spectroscopy and determined the carrier scattering rate (gamma) as a function of the varied carrier density (n). The n-dependent gamma(n) was obtained for a series of conditions systematically changed as (10 K, vacuum) -> (300 K, vacuum) -> (300 K, ambient pressure), which reveals that (1) at low-T, charged impurity (= A/root n) and short-range defect (= B root n) are the major scattering sources which constitute the total scattering gamma = A/root n + B root n, (2) among various kinds of phonons populated at room-T, surface polar phonon of the SiO2 substrate is the dominantly scattering source, and (3) in air, the gas molecules adsorbed on graphene play a dual role in carrier scattering as charged impurity center and resonant scattering center. We present the absolute scattering strengths of those individual scattering sources, which provides the complete map of scattering mechanism of CVD graphene. This scattering map allows us to find out practical measures to suppress the individual scatterings, the mobility gains accompanied by them, and finally the ultimate attainable carrier mobility for CVD graphene.</P>
Machine learning analysis of broadband optical reflectivity of semiconductor thin film
이병주,Yu Kwangnam,Jeon Jiwon,Choi E. J. 한국물리학회 2022 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.80 No.4
Broadband reflection spectroscopy is a non-invasive and non-contact tool widely used to measure optical dielectric constants and thickness of thin films. However, a lot of time and effort are consumed to analyze data before the results can be attained. Here we construct an artificial neural network (ANN) using scattering matrix formalism and U-net architecture, and apply it to analyze infrared reflection of SiO2 thin film grown on Si substrate. The ANN returns multiple outputs—frequencydependent optical refractive index (n), absorption coefficient( ), and thickness of the film (d)—with high precision with 0.6 nm thickness difference. Furthermore, the ANN can fit large number of reflection data taken at numerous positions (500) of the thin film in short time less than 150 ms, and creates fine-scale thickness map with 0.6 nm thickness resolution. This work demonstrates that U-net-based ANN is a powerful method of reflectivity analysis and can be applied to other thin-film materials.
서진이(Jinny Seo),최광남(Kwangnam Choi) 한국콘텐츠학회 2007 한국콘텐츠학회 종합학술대회 논문집 Vol.5 No.2_1
카메라폰의 비중이 증가함에 따라 카메라 모듈, 회전힌지 모듈, CCP 등 전용부품 시장이 확대되어 높은 성장을 유지했다. 동시에 카메라폰의 다기능화 및 고화소화로 인하여 카메라폰 대당 출하가격에서 전용부품이 차지하는 비중이 점차 높아지고 있으므로 휴대폰 카메라 모듈 기술에 대한 현황 및 시장 상황을 파악하여 카메라 모듈 기술의 사업화 전략에 활용하고자 한다. Industry for mobile camera module is a complex one based on various technologies, including mechanics, communication technology, material engineering, and electronics which are connected closely. This industry has been already known to a higher value-added business, and as going into an aging society, is expected a market growth. Also, it is a knowledge based component industry and each components assembled into product is almost home made items. This characteristics made many small and medium and venture enterprises participate in this area. Using this study, related companies refer the status and make the decision for commercialize the technology in the internal and world market.
김윤정(Yunjeong Kim),최광남(Kwangnam Choi),김재수(Jaesoo Kim) 한국정보과학회 2011 한국정보과학회 학술발표논문집 Vol.38 No.2C
최근 국내 협동연구 비중은 지속적으로 증가하여 협력연구에 대한 인식이 점진적으로 확산되는 추세이고 국제 공동연구 협력건수 및 투자금액도 모두 증가하는 추세이다. 기업은 물론 정부 연구기관 등 모든 분야에 있어서 개방과 협력을 통해 비용을 절감하고 혁신의 속도를 높이는 방향으로 패러다임이 변화하고 있기 때문이다. 국가R&D사업에서 산출된 정보·자원과 관련 과학기술정보를 공동활용하여 R&D생산성 향상을 도모하기 위하여 구축·운영 중인 국가과학기술지식정보서비스(NTIS)도 국제 협업·공동연구 활성화를 촉진하고자 국가R&D정보 국제화를 위한 기반을 구축하였다. 본 논문에서는 해외 과학기술정보 서비스 현황과 국가R&D정보 글로벌 서비스 구축 필요성을 소개하고 글로벌 서비스의 기반이 되는 데이터 품질 및 서비스 활성화를 위한 개선점에 대해 제안하고자 한다.