• The Journal of Korean Institute of Communications and Information Sciences
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• v.17 no.8
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• pp.867-880
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• 1992

In this paper, a circuit design techniques for Improving the voltage gain of the GaAs MESFET single amplifier is presented. Also, various types of existing current mirror and proposed current mirror of new configuration are compared. To obtain the high differential mode gain and low common mode gain, bootstrap gain enhancement technique Is used and common mode feedback Is employed In the design of differential amplifier. The simulation results show that designed differential amplifier has differential gain of 57.66dB, unity gain frequency of 23.25GHz. Also, differential amplifier using common mode feedback with alternative negative current mirror has CMRR of 83.S8dB, stew rate of 3500 V /\ulcorners.

• Journal of the Korean Society for information Management
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• v.26 no.1
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• pp.279-303
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• 2009

This study aims to clearly understand 'Functional Requisite of Authority Data(FRAD)' being studied by IFLA focused on aspect of change from FRAR. In addition, it has established relationship between FRAD and concerned rules by analyzing effect of FRAD on RDA and MARC21 and reviewed cataloguing rules, format and situations of major authority DB implementations concerned about domestic authority controls in reflection of IFLA's activities for authority control. Based on the analysis, it has looked into considerations for domestic authority controls standards such as access control methods, expansion of application scope, introduction of new approaches such as entity-relationship model, reinforcement of roles for national bibliographic agency. These study results would be utilized as basic data for authority control.

• Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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• 2006.05a
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• pp.587-592
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• 2006

Our country has been surrounded an advantageous around condition by sea on three sides. But the development into the sea, for a lack of systematic database on the marine total information network for a foundation information and reseach infra construction. This marine total information network will be not contribute to an advance of domestic marine industry through information's common ownership but also international competitiveness strength.

• Journal of Integrative Natural Science
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• v.12 no.2
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• pp.35-43
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• 2019

In the content-based image search properties, form information is simple because only the contours of objects are available, and although it can effectively extract the characteristics of the objects, it is sensitive to external noise. The radial distortion, one of these noises, is most prominent in the eyewear and, due to the structural characteristics of the imaging equipment, radiative distortion occurs in almost all imaging equipment. It is very important to determine the similarity of the objects in the images in which these distortions occurred to the actual objects. In order to improve this problem, we propose a strong image search technique for formative noise and radiative distortion using regularization phase angles and moments. Through simulation using Wang DB, the proposed algorithm proved excellent performance for radiation distortion that occurs in general. In addition, a system optimized for database can be implemented by making appropriate changes to the threshold values, enabling image retrieval with the desired level of confidence in various systems. The algorithm proposed in this paper is expected to be utilized as an optimal imaging system by extracting morphological form information of multimedia data.

• Journal of Soil and Groundwater Environment
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• v.24 no.2
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• pp.8-22
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• 2019

Among numerous chemicals used globally, the number of emerging contaminants is increasing. Numerical modeling for contaminant fate and transport in the subsurface is critical to evaluate environmental and health risk. In general, such models require physicochemical properties of contaminants as input values, which can be found in numerous chemical databases (DB). However, there exist lack of information specific to recently emerging contaminants, which requires estimation of physicochemical properties using regression programs. The purpose of the study is to introduce the workflow for identifying physicochemical properties of potential contaminants utilizing numerous chemical DBs, which frequently lists up potential contaminants for estimating chemical behavior. In this review paper, details of several chemical DBs such as KISChem, TOXNET, etc. and regression programs including EPI $Suite^{TM}$, ChemAxon, etc. were summarized and also benefit of using such DBs were explained. Finally, a few examples were introduced to estimate predominant phase, removal ratio, partitioning, and eco-toxicities by searching or regressing physicochemical properties.

• Proceedings of the Korea Water Resources Association Conference
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• 2016.05a
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• pp.568-568
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• 2016

가축분뇨는 발생부터 처리, 유통 단계에 이르기까지 다양한 경로에서 비점오염이 배출되고 있다. 그러나 소규모 농가의 경우 수거에 의해 공공처리시설에서 처리되는 가축분뇨의 양은 매우 적고, 대부분 자체 자원화 시설에서 톱밥발효에 의한 퇴비화를 하는 등 관리 미흡으로 인하여 축산 농가로부터 배출되는 비점오염부하가 큰 실정이다. 또한 관리주체가 모호하고, 축산비점오염물질의 정량화 및 하천에 미치는 영향에 대한 연구가 미흡하여 관리 대책 마련에 있어 어려움을 겪고 있다. 이에 본 연구에서는 축산농가의 밀집지역을 대상으로 축산 비점오염물질이 강우시에 주변 하천에 미치는 영향을 조사 및 분석하여 향후 축산 비점오염원 DB구축에 기초자료로 이용하고자 연구하였다. 연구대상 지역은 경상북도 영천시 북안천 일대로 축산비점오염원에 대한 영향 파악을 조사하기 위해 하천의 상류부터 하류까지 총 5개의 지점을 선정하여 2015년도에 6개 강우사상에 대하여 모니터링을 수행하였다. 수문분석을 위해 조상대상지역의 강우량, 유속 및 유량 등을 측정하였으며, 수질분석은 수질오염공정시험과 Standard Method를 이용하여 BOD, TN, TP 등의 농도를 분석하였다(USEPA 1993). 모니터링의 결과를 이용하여 강우시 오염물질에 대한 EMC를 산정하고 각 소유역 내 축산 현황에 따른 하천의 수질을 평가하였다.

• The Journal of Korean Institute of Next Generation Computing
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• v.14 no.5
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• pp.71-79
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• 2018

Recently, Korean traditional foods have been commercialized and exported to the world because they can be conveniently and easily ingested. In particular, it is necessary to study and develop recipe for representative foods with high preference in China and Japan which are geographically close to Korea. Therefore, this paper retrieves and collects recipes for representative foods of Korean traditional foods in China and Japan using country portal sites in China and Japan. The recipe collected for each country is constructed with a recipe database to analyze and visualize what materials are used for each type of recipe. The recipe analyzed by country will be used as basic data for commercializing Korean traditional food in China and Japan in the future.

• Proceedings of the Plant Resources Society of Korea Conference
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• 2022.09a
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• pp.53-53
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• 2022

대한민국의 농업생명자원 중 식물유전자원은 농촌진흥청 국립농업과학원 농업유전자원센터와 지방자치단체, 대학, 연구소 등 전국 79개 관리기관에서 보존하고 있으며 책임기관인 농업유전자원센터에서는 종자 1,599종 246,097자원, 관리기관은 영양체자원 1,476종 26,254자원을 관리하고 있다. 유전자원 관리(수집/증식/등록/평가/분양 등) 업무 중 생산되는 대량의 정보를 관리하기 위해서 농업유전자원 정보를 DB 구축하였다. 구축된 정보는 학명 등 기초정보, 형태·저항성 등 특성 정보, 화상·종자량·활력·분양·증식 등으로 구분하여 데이터베이스화하고, 이 정보를 관리하기 위한 농업유전자원관리시스템(Germplasm Management System, GMS)을 운영하였으나 개선전 프로그램은 설치 후 주기적인 업데이트를 해야하고, 하드웨어 교체시 프로그램을 재설치를 해야하는 번거로움이 존재하였다. 이러한 문제를 해결하기 위해 HTML5 방식으로 개선하였다. 개선 프로그램은 웹 브라우저(크롬, 마이크로소트 엣지 등)에 실행 주소(genebank.rda.go.kr/gms)를 입력만 하면 전국 79개 관리기관에서 자원을 접수하고 평가한 정보를 어디에서든 확인이 가능하다(메뉴사용 및 권한설정은 필요). 개선된 농업유전자원 정보관리시스템은 국가적 차원의 통합관리를 지원하여 농업생명자원을 효율적으로 관리하고 수요자가 원하는 자원에 대한 적절한 정보제공을 함으로써 농업생명자원의 활용 촉진에 기여할 것으로 기대된다.

• International Journal of Highway Engineering
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• v.5 no.4 s.18
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• pp.23-35
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• 2003

In this study, compaction evaluating program based on ASTM critria is developed bu analyzing the results of laboratory tests. And the laboratory tests such as compaction test, triaxial test and resonance column test of subgrade soils are performed to develop compaction management methodology at seven test sites. Especially, to figure out chararteristic with changing compactive efforts, the test was carried out at five levels of compactive efforts at each soil sample. Database was set up from the test results. With the methodology using mechanical property - the elastic modulus, the gap between road design and management and road construction management is narrowed. The regression equation of G/$G_{max}$ is proposed at each strain level of subgrade soils according to AASHTO criteria, and the relationship between fundamental properties of soil mass and degree of compaction is derived as well. The development of compaction management and field compaction management method is proposed by the elastic modulus based on mechanical tests.

• Korean Journal of Soil Science and Fertilizer
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• v.45 no.6
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• pp.1143-1152
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• 2012

We established a top-down methodology to estimate carbon footprint as national mean value (reference) with the statistical data on agri-livestock incomes in 2007. We also established LCI (life cycle inventory) DB by a bottom-up methodology with the data obtained from interview with farmers from 4 large-scale farms at Gunsan, Jeollabuk-do province to estimate carbon footprint in 2011. This study was carried out to compare top-down methodology and bottom-up methodology in performing LCA (life cycle assessment) to analyze the difference in GHGs (greenhouse gases) emission and carbon footprint under conventional rice cultivation system. Results of LCI analysis showed that most of $CO_2$ was emitted during fertilizer production and rice cultivation, whereas $CH_4$ and $N_2O$ were mostly emitted during rice cultivation. The carbon footprints on conventional rice production system were 2.39E+00 kg $CO_2$-eq. $kg^{-1}$ by top-down methodology, whereas 1.04E+00 kg $CO_2$-eq. $kg^{-1}$ by bottom-up methodology. The amount of agro-materials input during the entire rice cultivation for the two methodologies was similar. The amount of agro-materials input for the bottom-up methodology was sometimes greater than that for top-down methodology. While carbon footprint by the bottom-up methodology was smaller than that by the top-down methodology due to higher yield per cropping season by the bottom-up methodology. Under the conventional rice production system, fertilizer production showed the highest contribution to the environmental impacts on most categories except GWP (global warming potential) category. Rice cultivation was the highest contribution to the environmental impacts on GWP category under the conventional rice production system. The main factors of carbon footprints under the conventional rice production system were $CH_4$ emission from rice paddy field, the amount of fertilizer input and rice yield. Results of this study will be used for establishing baseline data for estimating carbon footprint from 'low carbon certification pilot project' as well as for developing farming methods of reducing $CO_2$ emission from rice paddy fields.