• 한국멀티미디어학회논문지
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• 제1권2호
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• pp.204-214
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• 1998

Web 환경에서 저작도구나 HTML올 이용한 기존의 학습 평가 시스템은 단방향 대화형 학습 시스템의 불편한 요인들을 개선하지 못하고 있다. 본 논문에서는 인터넷 환경에서 사용자의 편리성이 고려된 대화형 학습 평가 시스템을 설계하고 구현하였 다. 제안된 시스템은 크게 교사 모율과 학생 모률로 구분되어 있는데, 교사 모률은 데이터베이스에 새로운 문제 생성과 제거 기능, 정기 고사 채점 기놓 둥이 포함되어 있으며, 학생 모률은 강화 및 고사 선택 기능, 자신의 접수 보기 동의 기능들이 제공된다. 서버 시스템 환경은 Windows NT를 기반으로 한 인터넷 접속을 위해 IDC 파일과 SQL DB을 사용하여 구현되어 있으며, 클라이언트 시스템은 대화형 학습 평가 시스템에 대한 접근을 위해 익스플로어나 네스케이프를 기반으로 한 Windows 95 환경으로 구성되어 있다.

• 대한원격탐사학회:학술대회논문집
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• 대한원격탐사학회 2004년도 Proceedings of ISRS 2004
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• pp.294-297
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• 2004

The purpose of this study was to develop landslide susceptibility analysis techniques using artificial neural networks and then to apply these to the selected study area of Janghung in Korea. We aimed to verify the effect of data selection on training sites. Landslide locations were identified from interpretation of satellite images and field survey data, and a spatial database of the topography, soil, forest, and land use was constructed. Thirteen landslide-related factors were extracted from the spatial database. Using these factors, landslide susceptibility was analyzed using an artificial neural network. The weights of each factor were determined by the back-propagation training method. Five different training datasets were applied to analyze and verify the effect of training. Then, the landslide susceptibility indices were calculated using the trained back-propagation weights and susceptibility maps were constructed from Geographic Information System (GIS) data for the five cases. The results of the landslide susceptibility maps were verified and compared using landslide location data. GIS data were used to efficiently analyze the large volume of data, and the artificial neural network proved to be an effective tool to analyze landslide susceptibility.

• 대한지하수환경학회지
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• 제4권4호
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• pp.223-230
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• 1997

지하수 오염에 대한 광역적인 취약성 평가를 하기 위한 DRASTIC 시스템은 미국 EPA (Environmental Protection Agency)에서 개발된 것으로 지하수위, 충진률, 대수층 매체, 토양 매체, 지형 경사, 비포화대 매체, 수리전도도 등 수리지질학적 요소들을 이용하여 지하수 오염 취약성을 상대적으로 평가하기 위한 표준화된 시스템으로 현재 널리 사용되고 있다. DRASTIC 시스템을 사용하여 분석된 지하수 오염 취약성 결과는 취수정 혹은 관측공의 위치선정, 쓰레기 매립지 적지선정, 지하수와 관련된 토지 이용 등에 기초자료로 이용될 수 있다. 본 연구는 이러한 DRASTIC 시스템을 적용하기 위해 GIS(Geographic Information System)를 이용하여 영광군 지역의 지형, 수계, 우물, 지질, 토양, 토지이용 등 수리지질학적 요소들에 대한 공간 데이터베이스를 구축하였고, 이러한 공간 데이터베이스를 GIS의 중첩기 법을 이용하여 분석하여 광역적인 지하수 오염 취약성에 대한 상대적인 분석치를 얻고 이를 도면으로 작성하였다.

• Safety and Health at Work
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• 제11권3호
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• pp.249-261
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• 2020

Background: Hearing loss is one of the most prevalent worker health conditions worldwide. Although the effect of noise exposure on hearing is well researched, other workplace exposures may account for significant hearing loss. The aim of this review was to determine whether occupational hand-arm vibration exposure through use of power or pneumatic tools, independent of noise exposure, is associated with permanent hearing loss. Do workers suffer from hand-arm vibratione-induced hearing loss? Methods: Peer-reviewed articles published in English between 1981 and 2020 were identified through five online databases with five search keywords. Preferred Reporting Items for Systematic Reviews and Meta-analyses guidelines, including online database search methodology, study selection, article exclusion, and assessment of potential study design confounders and biases, were followed. Results: Database searches retrieved 697 articles. Fifteen articles that reported 17 studies met the criteria for review. All but two studies revealed statistically significant associations between occupational exposure to hand-arm vibration and hearing loss. The majority of the study results revealed associations between hand-arm vibration and hearing loss, independent of potential age and noise confounders. Conclusion: Few studies have examined the association between occupational exposure to hand-arm vibration and hearing loss. Dose response data were limited as only one study measured vibration intensity and duration. Although the majority of studies identified statistically significant associations, causal relationships could not be determined. Further research using standardized and uniform measurement protocols is needed to confirm whether the association between occupational exposure to hand-arm vibration and permanent hearing loss is causal and the mechanism(s).

• 상하수도학회지
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• 제23권5호
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• pp.565-572
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• 2009

Hydraulic modeling is widely used to simulate wastewater flow. The simulated models are used to prevent flood and many other problems associated with wastewater flow in planning or rehabilitating sewer systems. In this study, MAKESW (An engineer, South Korea), MOUSE (DHI, Denmark), and SWMM (XPSoftware, USA) are used to for hydraulic modeling of wastewater in C-city, South Korea and E-city, Iraq. These modeling tools produced different results. SWMM comparably overpredicted runoff and peak flow. In using SWMM, use of accurate data with a high confidential level, detail examination over the target basin surface, and the careful selection of a runoff model, which describes Korea's unique hydraulic characteristics are recommended. Modification of existing models through the optimization of variables cannot be achieved at this moment. Setting up an integrated modeling environment is considered to be essential to utilize modeling and further apply the results for various projects. Standardization of GIS database, the criteria for and the scope of model application, and database management systems need to be prepared to expand modeling application.

• IEIE Transactions on Smart Processing and Computing
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• 제6권4호
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• pp.262-268
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• 2017

Intelligent video surveillance systems have been developed to monitor global areas and find specific target objects using a large-scale database. However, person re-identification presents some challenges, such as pose change and occlusions. To solve the problems, this paper presents an improved person re-identification method using sparse representation and saliency-based dictionary construction. The proposed method consists of three parts: i) feature description based on salient colors and textures for dictionary elements, ii) orthogonal atom selection using cosine similarity to deal with pose and viewpoint change, and iii) measurement of reconstruction error to rank the gallery corresponding a probe object. The proposed method provides good performance, since robust descriptors used as a dictionary atom are generated by weighting some salient features, and dictionary atoms are selected by reducing excessive redundancy causing low accuracy. Therefore, the proposed method can be applied in a large scale-database surveillance system to search for a specific object.

• Steel and Composite Structures
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• 제21권4호
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• pp.921-947
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• 2016

Concrete Filled Fibre Reinforced Polymer Tube (CFFT) for new columns construction has attracted significant research attention in recent years. The CFFT acts as a formwork for new columns and a barrier to corrosion accelerating agents. It significantly increases both the strength capacity (Strength enhancement ratio) and the ductility (Strain enhancement ratio) of reinforced concrete columns. In this study, based on predefined selection criteria, experimental investigation results of 134 circular CFFT columns under axial compression have been compiled and analysed from 599 CFFT specimens available in the literature. It has been observed that actual confinement ratio (expressed as a function of material properties of fibres, diameter of CFFT and compressive strength of concrete) has significant influence on the strength and ductility of circular CFFT columns. Design oriented models have been proposed to compute the strength and strain enhancement ratios of circular CFFT columns. The proposed strength and strain enhancement ratio models have significantly reduced Average Absolute Error (AAE), Mean Square Error (MSE), Relative Standard Error of Estimate (RSEE) and Standard Deviation (SD) as compared to other available strength and strain enhancement ratios of circular CFFT column models. The predictions of the proposed strength and strain enhancement ratio models match well with the experimental strength and strain enhancement ratios investigation results in the compiled database.

• 음성과학
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• 제15권2호
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• pp.67-77
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• 2008

In this paper, we implemented a robust speech recognizer using the TMS320VC33 DSP. For this implementation, we had built speech and noise database suitable for the recognizer using spectral subtraction method for noise removal. The recognizer has an explicit structure in aspect that a speech signal is enhanced through spectral subtraction before endpoints detection and feature extraction. This helps make the operation of the recognizer clear and build HMM models which give minimum model-mismatch. Since the recognizer was developed for the purpose of controlling car facilities and voice dialing, it has two recognition engines, speaker independent one for controlling car facilities and speaker dependent one for voice dialing. We adopted a conventional DTW algorithm for the latter and a continuous HMM for the former. Though various off-line recognition test, we made a selection of optimal conditions of several recognition parameters for a resource-limited embedded recognizer, which led to HMM models of the three mixtures per state. The car noise added speech database is enhanced using spectral subtraction before HMM parameter estimation for reducing model-mismatch caused by nonlinear distortion from spectral subtraction. The hardware module developed includes a microcontroller for host interface which processes the protocol between the DSP and a host.

• KSBB Journal
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• 제22권3호
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• pp.139-145
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• 2007

암에 효능을 보이는 생리활성소재의 탐색원을 발굴하기 위한 방법의 하나로 동양의학 데이터베이스의 처방정보를 활용하였다. 신동의약보감에 포함되어 있는 170건의 암 처방 천연약재의 처방빈도와 처방분량을 분석하였다. 처방순위와 처방 분량에 따라 마련된 점수표 (score table)를 기준으로 총처방점수 (total prescription score)를 작성하였다. 선행연구 결과들을 조사한 결과 총처방점수가 높은 약재들을 소재로 한 관련 보고들이 많은 것으로 나타났다. 결과적으로 당귀, 황기, 감초, 반하, 백출, 진피, 인삼, 백작약, 대황, 천궁, 지모, 천남성, 오미자, 형개, 흑축, 방기, 복령, 오수유 등이 암에 효과가 있으며 이들 약재를 이용한 항암 소재의 탐색이 제안되었다.

• 한국농공학회논문집
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• 제50권1호
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• pp.95-106
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• 2008

Eco-friendly material and implementation methods have become important along with the existing standardized maintenance concept for the irrigation and flood control. However, the intrinsic function of the hydraulic structure is water supply and disaster prevention. Therefore, the material and work methods should be considered both eco-friendliness, durability and safety which are prerequisite elements to maintain the engineering function. In this study eco-friendly material and work methods would be classified into the vegetation based system, eco-friendly concrete system and stone-material system according to the characteristics of material. The quality standard for durability followed KS specification and related regulations. The quality standard for safety and eco-friendliness was set after literature review, and the database was developed using the standard. The structure applicable to onsite - the eco-friendly material and work method were classified based on the function and material of the hydraulic structure. Finally, database has been established for convenient management and selection of the proper material and work method. The eco-friendly material and work method could be searched easily for the convenience of the users, and the web-based data system has been developed for continuous registration of the material and work methods to be developed in the future.