• 대한원격탐사학회:학술대회논문집
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• 대한원격탐사학회 2006년도 Proceedings of ISRS 2006 PORSEC Volume I
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• pp.356-359
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• 2006

The high prices and lack of information for satellite images prevent researchers from studying remote sensing and most non-professional people can't have the simple and easy solutions for the manipulation of satellite images. 'Satellite Imagery Information Management Center'(SIMC) project which is promoted by ETRI (Electronics and Telecommunications Research Institute) from 2002 to 2005 in Korea have the purpose to provide the satellite images freely to the public domain and the solutions for the above mentioned problems. Our project have the following five systems; Data Acquisition System, Data Preservation System, Integrated Solution System, Technology Development System, Operation Plan System. Data Acquisition System collects the satellite images such as LANDSAT, IKONOS, etc. Data Preservation System consists of database which registers the diverse satellite images. Integrated Solution System gives the user of public domain for the web service which search, order and transfer the satellite images. Technology Development System has the many processing technologies for the satellite images. Finally, the Operation Plan system has the role to plan the future of our SIMC project. In this paper, we will give the result of SIMC Project for each five systems during the fast four years from 2002 to 2005.

• Computers and Concrete
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• 제2권4호
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• pp.293-307
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• 2005

The development and the main features of an expert system for modeling the requirements of durable concrete in chemical exposure, called the Durable Concrete Advisor for Chemical Exposure (DCACE), are described. The system was developed to help improve the quality of concrete exposed to chemical environment by minimizing mistakes and deficiencies in selecting concrete constituents. Using Kappa-PC expert system shell, an object-oriented model was developed where the rule-based reasoning operates on or across objects. The American Concrete Institute manual of concrete practice was chosen as the main source of knowledge. Other textual sources were also consulted for knowledge acquisition. The major objectives of the research were acquisition and formalization of the relevant knowledge and building an expert system for making durable concrete for chemical exposure regarding sulfate attack, acid attack, seawater attack and carbonation. Similar to most expert systems, this system has explanation facilities, can be incrementally expanded, and has an easy to understand knowledge base. The performance of the system is demonstrated by an example session. The system is user-friendly and can be used as an educational tool.

• 한국전자거래학회:학술대회논문집
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• 한국전자거래학회 2005년도 e-Biz World Conference 2005
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• pp.55-61
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• 2005

We will introduce a new web-based knowledge management system in progress, in which XML-based web information extraction and our structuring knowledge technologies are combined using ontology-based natural language processing. Our aim is to provide efficient access to heterogeneous information on the web, enabling users to use a wide range of textual and non textual resources, such as newspapers and databases, effortlessly to accelerate knowledge acquisition from such knowledge sources. In order to achieve the efficient knowledge management, we propose at first an XML-based Web information extraction which contains a sophisticated control language to extract data from Web pages. With using standard XML Technologies in the system, our approach can make extracting information easy because of a) detaching rules from processing, b) restricting target for processing, c) Interactive operations for developing extracting rules. Then we propose a structuring knowledge system which includes, 1) automatic term recognition, 2) domain oriented automatic term clustering, 3) similarity-based document retrieval, 4) real-time document clustering, and 5) visualization. The system supports integrating different types of databases (textual and non textual) and retrieving different types of information simultaneously. Through further explanation to the specification and the implementation technique of the system, we will demonstrate how the system can accelerate knowledge acquisition on the Web even for novice users of the field.

• 한국건축시공학회:학술대회논문집
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• 한국건축시공학회 2017년도 추계 학술논문 발표대회
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• pp.193-194
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• 2017

In this research, the density value of the turbid solution is measured by using the principle of inexpensive but easy Hydrometer method for cement delivered to the actual raw concrete plant, By analyzing the correlation of powder aid, we will try to present a scheme that can be utilized as a method of acquisition acquisition inspection. As a result of the analysis, it was found that there was a large difference between the measured powders assisted with cement powder on the report, and the correlation with the actually measured powder aid Hydrometer density value was good. Therefore, using the method of Fig. 3, it was possible to know that the degree of powder quality of cement delivered to the raw concrete factory can be evaluated quickly and utilized at the time of argument inspection.

• 대한건축학회논문집:구조계
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• 제34권10호
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• pp.11-18
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• 2018

In this study, the cross-sectional image has been acquired to evaluate the aggregate distribution affecting quality of lightweight aggregate concrete, and through the binarization method, the study is to calculate the aggregate area of upper and lower sections to develop the method to assess the aggregate distribution of concrete. The acquisition of cross-section image of concrete for the above was available from the cross-sectional photography of cleavage tension of a normal test specimen, and an easily accessible and convenient image analysis software was used for image analysis. As a result, through such image analyses, the proportion of aggregate distribution of upper and lower sections of the test specien could be calculated, and the proportion of aggregate area U/L value of the upper and lower regions of concrete cross-section was calculated, revealing that it could be used as the comprehensive index of aggregate distribution. Moreover, through such method, relatively easy image acquisition methods and analytic methods have been proposed, and this indicated that the development of modeling to assess aggregate distribution quantitatively is available. Based on these methods, it is expected that the extraction of fundamental data to reconsider the connectivity with processes in concrete will be available through quality assessment of quantitative concrete.

• 한국정보통신학회논문지
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• 제4권5호
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• pp.1157-1163
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• 2000

논문에서 우리는 한 대의 카메라 전면에 위치한 4개의 거울을 이용한 실질적인 스테레오 비젼 시스템을 제안한다. 스테레오 이미지는 한 대의 CCD 카메라 정면에 위치한 4개의 거울을 이용하여 좌/우 이미지가 절반씩 만들어진다. 3차원 공간에서 물체 위의 한 점은 4개의 거울로 인해 2개의 가상 점으로 변환된다. 전통적인 스테레오 비젼 시스템과 같이 2개 가상 점이 위치한 좌/우 이미지 사이의 변위는 물체 위의 점에 대 한 깊이와 직접 관련이 된다. 그러므로 이 시스템은 카메라가 한 대만 사용해 카메라 교정과 스테레오 이미지 획득에 큰 장점이 있다.

• 한국정보시스템학회지:정보시스템연구
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• 제12권1호
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• pp.145-158
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• 2003

Workflow is the automation of a business process, in whole or part, during which documents, information or tasks are passed from one participant to another for action, according to a set of procedural rules. The software selection problem is made difficult by the multiplicity of competing products and the lack of expertise and experience of users in the methods of software evaluation. Although the selection process for workflow is similar to that proposed for the acquisition of any software packages, differences arise in their evaluation criteria and choice methods. In this paper, we suggest the Analytic Hierarchy Process(AHP) method for selecting workflow software. The AHP is an intuitively easy method for formulating and analyzing decisions. It was developed to solve a specific class of problems that involves prioritization of potential alternate solutions. We showed how to evaluate 9 commercial workflow products by deciding the relative importance of the main criteria in the AHP model. We utilized the evaluation data for criteria ready suggested by specialist groups. Our methodology will be helpful to those who are going to adopt a best workflow product in their organizations. Although the criteria and their evaluation scores regarding workflow products are suggested, it is not easy to apply them to a real case and get solutions without a model.

• 한국지리정보학회지
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• 제6권4호
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• pp.51-58
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• 2003

GPS를 대표로 하는 위성측위시스템은 GIS 데이터베이스 구축을 위한 데이터 취득에 있어서 중요한 역할을 하고 있다. 또한 최근의 위성측위 기술의 발전은 보다 빠르고 쉽고 경제적인 방법으로 대상물의 정확한 위치 정보의 취득을 가능하게 하였다. 그러나 도시공간 환경에 있어서는 수많은 도시공간 구조물들로 인해 측위위성과 수신기 사이의 시통이 제한됨으로써 정확한 GIS 데이터베이스 구축에 필요한 신뢰성 있는 위치정보 취득이 곤란하게 된다. 또한 대부분의 GIS 데이터 생성과 갱신의 소요가 도시공간을 중심으로 이루어지고 있음을 고려할 때, 이와 같은 도시공간에서의 위성측위를 통한 위치정보 취득의 곤란은, 정확하고 신속함을 필요로 하는 GIS 데이터 취득에 심각한 문제를 야기하게 된다. 따라서, 본 연구에서는 실제 도시공간에의 위치정보 취득을 위한 위성측위 환경을 평가하기 위해 차량측정장치를 사용하여 실제 도시공간을 대상으로 현장 실험을 수행하였다. 본 연구를 통하여 기존의 GPS 만을 이용한 위성측위 방식에서는 위치정보 데이터 취득에 한계성이 있다는 것을 파악할 수 있었으며, 이 결과는 향후 새로운 보완 측위 기술 연구분야에서 유용한 기초자료로서 활용될 수 있을 것으로 사료된다.

• 한국산학기술학회논문지
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• 제21권5호
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• pp.1-6
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• 2020

UAV(Unmanned Aerial Vehicle)는 일반 유인 항공기나 위성에 비해 경제성이 크고, 대상물에 접근이 용이하여 군사적인 목적으로 많이 이용되어 왔다. 최근에는 IT 기술의 발전으로 다양한 센서를 탑재한 UAV가 출시되고 있으며 측량, 농업, 기상관측, 통신, 방송, 스포츠 등 광범위한 분야에서 이용이 증가하고 있으며, 공간정보를 제작하고 활용하는 분야에서 UAV를 활용하기 위한 다양한 연구와 시도가 증가하고 있다. 하지만 기존의 연구는 사진측량과 관련된 연구가 대부분이며, LiDAR(Light Detection And Ranging)에 대한 분석적 연구는 부족한 실정이다. 이에 본 연구에서는 공간정보 분야 활용을 위한 UAV LiDAR 센서의 특징을 분석하고자 하였다. LiDAR 센서의 취득속도, 반사횟수 등 상용화된 LiDAR 센서의 성능을 조사하고, 비슷한 정확도와 데이터 취득 가능 거리를 가지는 Surveyor Ultra와 VX15 모델을 선정하여 데이터 취득 및 분석을 수행하였다. 연구를 통해 각 센서별로 연구대상지의 DSM(Digital Surface Model)을 생성하고, 비교를 통해 데이터의 밀도, 정밀도, 식생지역에서 지면 데이터의 취득 등 특징을 제시하였다. UAV LiDAR 센서는 0.03m~0.05m의 정확도를 나타내었으며, 효과적인 활용을 위해서는 데이터의 특징들을 고려한 장비의 선정이 필요할 것으로 판단된다. 향후, 추가적인 연구를 통해 도심지역, 산림지역 등 다양한 지역에 대한 데이터 취득 및 분석이 이루어 진다면 UAV LiDAR의 활용성을 제시할 수 있을 것이다.

• 한국기계연구소 소보
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• 통권17호
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• pp.61-68
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• 1987

The main objective of this paper is to develop the computer-aided vibrational signal processing and monitoring system of rotating machinery. This system has an automatic data acquisition capability and analyze for machine fault diagnosis. By spectrum analysis, machine’s failure can be identified. The monitoring system enables diagnosis of the fault in rotating machinery. In this study, the conventional electrical fans are selected as a model case. The date processing and fault monitoring system proposed here can be applied to the automation of the inspection process in assembling motor-shaft systems. The automatic inspection can enhance the product quality and keep it stable. Since the proposed system is developed for personal computers, it might be cheap in cost and easy in installation.