• Journal of Soil and Groundwater Environment
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• v.19 no.4
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• pp.12-22
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• 2014

This study evaluated the pattern of groundwater fluctuation in cyrstalline rock using time series and factor analyses. From the results, groundwater level for the 18 wells was classified into 4 types reflecting the hydrogeological properties and rainfall event. Type 1 (DB1-5, DB1-6, DB2-2, KB-10, KB-13) was significantly influenced by groundwater flow through water-conducting features, whereas type 2 (DB1-3, DB1-7, KB-1~KB-3, KB-7, KB-11, KB-14, KB-15) was affected by minor fracture network as well as rainfall event. Type 3 (DB1-1, DB1-2) was mainly influenced by surface infiltration of rainfall event. Type 4 (DB1-8, KB-9) was reflected by the irregular variation of groundwater level caused by anisotropy and heterogeneity of crystalline rock.

• Korean Journal of Food Science and Technology
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• v.52 no.1
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• pp.81-88
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• 2020

The biological activities of Platycodon grandiflorum (PG) root extracts have been studied intensively, whereas there are limited number of studies on PG seed extract (PGSE). PGSE was prepared by ethanol extraction, and its antidiabetic effect was evaluated in mice with type 2 diabetes (C57BLKS/J-db/db). Results indicated that the administration of high-dose PGSE (600 mg/kg, wb) significantly stabilized the blood glucose levels, as evidenced by the results of the oral glucose tolerance test. Mice treated with high-dose PGSE exhibited significantly lower serum hemoglobin A1c, insulin, and leptin levels after eight weeks of feeding trial (p<0.05). High-dose PGSE administration significantly improved glucose uptake in the femoral muscle of db/db mice by activating both IRS-1/PI3K/AKT/AS160 and AMPK phosphorylation pathways. GLUT4 translocation from the cytosol to the plasma membrane increased 1.7-fold in the PGSE high-dose group. These results suggest that PGSE has potential for development as an antidiabetic agent.

• Journal of the Institute of Electronics Engineers of Korea SP
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• v.38 no.4
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• pp.434-441
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• 2001

We present an image retrieval method for improving retrieval performance by the effective fusion of spatial histogram and wavelet moments. In this method, the similarity for spatial histograms and the similarity for wavelet moment are effectively fused in the computation of the similarity between a query image and DB image. That is, the wavelet moments feature represented in multi-resolution and the spatial histogram feature robust to translation and rotation are used to improve retrieval performance. In order to evaluate the performance of the proposed method, we use Brodatz texture DB, MPEG-7 T1 DB, and Corel Draw Photo DB. Experimental results show that the proposed method yields 5.3% and 13.8% better Performances for Brodatz DB, and 15.5% and 3.2% better Performances for Corel Draw Photo DB over the histogram method and the wavelet moment method, respectively.

• Digital Contents
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• no.9 s.52
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• pp.52-60
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• 1997

올초 한국통신에서는 94년부터 올해까지 4개년간 시행된 공공 데이터베이스개발 사업에 대한 총체적인 평가를 시행했다. 동사업에 대한 평가가 어떻게 나타났는지 외부기관에서 분석한 평가보고서를 통해 살펴봤다.

• The Journal of The Korea Institute of Intelligent Transport Systems
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• v.17 no.5
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• pp.55-64
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• 2018

In this paper, we propose fully convolutional neural networks based automatic detection of a pothole that directly causes driver's safety accidents and the vehicle damage. First, the training DB is collected through the camera installed in the vehicle while driving on the road, and the model is trained in the form of a semantic segmentation using the fully convolutional neural networks. In order to generate robust performance in a dark environment, we augmented the training DB according to brightness, and finally generated a total of 30,000 training images. In addition, a total of 450 evaluation DB was created to verify the performance of the proposed automatic pothole detection, and a total of four experts evaluated each image. As a result, the proposed pothole detection showed robust performance for missing.

• Proceedings of the Korean Institute of Navigation and Port Research Conference
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• 2018.11a
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• pp.175-176
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• 2018

여름철 북극 해빙 면적의 감소 추세로 빙해선박의 북극항로 통항회수가 증가하고 있어 선박의 안전 항해를 위한 기술 개발에 관심이 집중되고 있다. 본 연구에서는 선박해양플랜트연구소에서 개발 중인 KRISO Arctic Safe Routing System(KARS)의 개념과 함께 핵심 모듈 중 하나인 빙저항 추진 성능 DB 개발 과정을 소개하였다. 우선 빙해수조에서 다양한 빙상환경(평탄빙, 유빙, 빙맥 등)에 따른 선박의 빙성능 평가 시험을 수행한 후 대상선박의 기본적인 빙성능을 도출하였고 빙성능 추정 S/W의 해석결과와 비교 검증을 수행하여 다양한 환경 변수를 고려한 빙저항 추진 성능 DB를 생성하였다. 아울러, 생성된 DB의 검증을 위해 2017년 8월 쇄빙연구선 아라온의 빙해역 실선시험 동안 계측된 결과와 비교 분석하여 정확도를 분석하였고 KARS의 개선 사항 및 향후 활용 가능성을 고찰하였다.

• Journal of the Korean Geographical Society
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• v.38 no.2
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• pp.275-291
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• 2003

It was essential to develop the DB-type teaching and teaming material for geography instruction using a method of ICT. The DB-type teaching and learning material was considered as a alternative in solving the problems of web-based geography instruction. Accordingly, in this study, the geography image DB program as developed, and based on this program the CD-ROM called GEO-DB, having the function of electronic dictionary of geography image for geography teaching and teaming was made. The GEO-DB was composed of 3,060 geography images collected by teachers and learners. The GEO-DB was made to be used simply by teachers and learners. Especially, the portfolio function was Included in the GEO-DB, and that was focused to the instructional system design of teacher and the self-directed teaming ability development of learner. Teachers and learners using this GEO-DB assessed that because the GEO-DB had the easiness of use, the speed of reference and the unlimitedness of extension, it could enlarge the possibility of using a method of In, and it could contribute to the development of geography teaming ability and the change of geography teaming attitude.

• Journal of Food Hygiene and Safety
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• v.35 no.6
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• pp.607-617
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• 2020

Human bio-monitoring (HBM) data is a very important resource for tracking total exposure and concentrations of a parent chemical or its metabolites in human biomarkers. However, until now, it was difficult to execute the integration of different types of HBM data due to incompatibility problems caused by gaps in study design, chemical description and coding system between different sources in Korea. In this study, we presented a standardized code system and HBM knowledge model (KM) based on relational database modeling methodology. For this purpose, we used 11 raw datasets collected from the Ministry of Food and Drug Safety (MFDS) between 2006 and 2018. We then constructed the HBM database (DB) using a total of 205,491 concentration-related data points for 18,870 participants and 86 chemicals. In addition, we developed a summary report-type statistical analysis program to verify the inputted HBM datasets. This study will contribute to promoting the sustainable creation and versatile utilization of big-data for HBM results at the MFDS.

• Proceedings of the Acoustical Society of Korea Conference
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• 1998.06c
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• pp.139-142
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• 1998

그 동안 TTS 음성합성의 평가 척도로 명료도(Clarity)와 자연성(Naturalness)을 기준으로 삼았다. 이제는 합성음의 평가 기준이 사람 목소리와 이해도가 되는 것이 좋겠다고 생각한다. 본 논문은 사람 목소리와 이해도라는 척도 중에서 사람 목소리에 관한 주제를 다루고자 한다. 이를 위하여 음성 DB의 합성 단위로 CVC type을 기본으로 하고, CV, VC type으로 보강한 단위를 선정하여 음성 DB를 구축하였다. 그리고 합성 알고리즘은 음색을 살리며 피치 변경이 용이한 PS-RELP 알고리즘을 제안하였다.

• Proceedings of the Korea Multimedia Society Conference
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• 2000.11a
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• pp.419-422
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• 2000

본 논문에서는 길을 기반으로 하여 학습자 스스로 학습의 장면을 결정하고, 학습의 형태를 계획하여 학습을 주도적으로 이끌어 낼 수 있도록 하는 학습자 중심의 자기주도적 학습 환경을 선계 및 구현하였다. 학습 설계 대상은 학습자와 길 사이의 동적 상호작용을 통하여 지필 학습방법으로 학습하기 힘들었던 단원인 고등학교 공통수학의 삼각함수를 선택하였다. 학습자가 학습장면에서 직접 실행해 보고 도형을 이동시켜 변화하는 현상을 관찰하고 탐구함으로써 실시간으로 피드백이 가능하여 학습의 효과를 극대화하였으며 학습자에 대한 정보와 학습의 상태는 DB를 이용하여 관리하도록 하였고 형성평가와 총괄평가는 DB를 이용하도록 설계하였다.