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A determinant formula for the relative congruent zeta function in cyclotomic function fields
안재현,가동석 충청수학회 2015 충청수학회지 Vol.28 No.1
In this paper we give a determinant formula for therelative congruent zeta function in cyclotomic function ¯elds.
Development of Atmospheric Correction Algorithm for Geostationary Ocean Color Imager (GOCI)
안재현,박영제,류주형,이보람,오임상 한국해양과학기술원 2012 Ocean science journal Vol.47 No.3
This paper describes an atmospheric correction algorithm for Geostationary Ocean Color Imager (GOCI) and its early phase evaluation. This algorithm was implemented in GOCI Data Processing System (GDPS) version 1.1. The algorithm is based on the standard SeaWiFS method, which accounts for multiple scattering effects and partially updated in terms of turbid case-2 water correction, optimized aerosol models, and solar angle correction per slot. For turbid water correction, we used a regional empirical relationship between water reflectance at the red (660 nm) and near infrared bands (745 nm and 865 nm). The relationship was derived from turbid pixels in satellite images after atmospheric correction, and processed using aerosol properties derived for neighboring non-turbid waters. For validation of the GOCI atmospheric correction, we compared our results with in situ measurements of normalized water leaving radiance (nLw) spectra that were obtained during several cruises in 2011 around Korean peninsula. The match up showed an acceptable result with mean ratio of the GOCI to in situ nL w(λ), 1.17, 1.24,1.26, 1.15, 0.86 and 0.99 at 412 nm, 443 nm, 490 nm, 555 nm, 660 nm and 680 nm, respectively. It is speculated that part of the deviation arose from a lack of vicarious calibration and uncertainties in the above water nLw measurements.
안재현,이재근,이승호,홍일표 한국수자원학회 2010 한국수자원학회논문집 Vol.43 No.6
가상수(假想水, Virtual Water)란 일정량의 농산물, 축산물, 공산품과 같은 생산품 혹은 서비스 제공에 필요한 물의양을 뜻하는 것으로 1990년대 초반 Tony Allan 교수가 처음 제시하였다. 본 연구는 Chapagain and Hoekstra (2004)이 제시한 농축산물 및 공산품의 단위 가상수량 산정방법을 분석 및 적용하여 1998년부터 2007년까지 우리나라의 가상수 수출입량을 산정하였다. 또한 가상수 수출입을 국가간 정량화하는 방법 Virtual water is defined as the volume of water to produce commodities and provide services, which has been developed by Tony Allan since the early 1990s. This research aims to evaluate a volume of virtual water trade in Korea from 1998 to 2007 by applyin
WEIGHT ENUMERATORS OF TWO CLASSES OF LINEAR CODES
안재현,가연석 충청수학회 2020 충청수학회지 Vol.33 No.1
Recently, linear codes constructed from defining sets have been studied widely and determined their complete weight enumerators and weight enumerators. In this paper, we obtain complete weight enumerators of linear codes and weight enumerators of linear codes. These codes have at most three weight linear codes. As application, we show that these codes can be used in secret sharing schemes and authentication codes.
안재현,조아라,함은일,성보미,김윤희,전봉현 한국공업화학회 2019 한국공업화학회 연구논문 초록집 Vol.2019 No.1
In this study, we fabricated magnetic silver nanoshells (MS-Nanoshell) with magnetic property and SERS (surface-enhanced Raman scattering) fuction for SERS-based detection. MS-Nanoshell contained hundreds of small metal nanoparticles for rapid accumulation and had rough silver shell for sensitive SERS detection. The SERS intensity of MS-Nanoshell was strong enough to provide low level detection. The SERS signal strength was much stronger from the MS-Nanoshell that was aggregated than from the non-aggregated MS-Nanoshell. 4-Fluorothiophenol was detected at a low concentration of 1 nM, equivalent to 0.16 ppb. The detection limit for tetramethylthiuram disulfide was 10 M, which corresponded to 3 ppm. Application of M-AgNS can be used to detect trace very low amounts of organic matter by Raman system.