• Proceedings of the KSRS Conference
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• 2008.03a
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• pp.95-100
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• 2008

3차원으로 구성되어 있는 실세계를 보다 효과적이고 신속하게 모니터링하기 위해서는 변화된 지역의 정확한 위치정보 획득과 변화 결과의 빠른 도출을 위한 자동화 방안이 필요하다. 일반적으로 변화탐지를 위해 사용되어 온 항공사진이나 위성영상은 자료 획득에 있어 날씨와 같은 자연환경의 영향을 많이 받으며, 자동으로 변화탐지를 수행하는데 많은 문제점을 안고 있다. 반면에 항공 LiDAR 시스템은 영상시스템과는 달리 날씨 등에 영향을 상대적으로 적게 받으며, 지형지물에 대한 3차원 좌표 정보를 직접 획득하기 때문에 자동으로 처리하기에 매우 효율적이다. 본 연구에서는 항공 LiDAR 데이터만을 이용하여 도시지역의 시공간적 변화를 자동으로 탐지하는 방법을 연구 하였다. 변화탐지의 대상이 도시지역이므로 객체를 기반으로 다양한 변수를 사용하여 변화탐지를 수행하였다. 연구에 사용된 데이터는 서로 다른 시기에 획득된 항공 LiDAR 데이터이며, 두 데이터간의 변화탐지를 위해 먼저 상호정합을 수행하였으며, 개별 객체를 추출하기 위해 필터링과 Grouping 과정을 수행하였다. 마지막으로 Grouping된 객체를 대상으로 모양, 면적, 높이 변화를 비교하여 변화를 탐지하였다. 객체의 외곽선과 내부 영역의 모양을 표현하는 형상계수를 사용하므로 수평방향의 객체에 대한 기하학적인 모양 변화를 탐지할 수 있었으며, 객체의 높이값을 비교함으로써 수직방향으로의 변화도 탐지할 수 있었다. 본 연구에서 수행한 객체 기반의 변화탐지 방법은 91.67%의 전체 정확도를 획득하였다.

• Journal of the Korea institute for structural maintenance and inspection
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• v.18 no.2
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• pp.30-37
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• 2014

In this study, we studied how to perform the structural analysis which need a large-capacity flash memory with the computer program when the flash memory storage of a personal computer has no enough room for the analysis of structure. As one of the solutions of this problem, the blocking method of stiffness matrix, which is a method that stiffness matrix is divided by a few blocks and each block is sequentially used for the calculation of matrix decomposition, is proposed and an algorithm available in computer program is derived on the method. Finally, A structural analysis program (sNs) based on this study is developed and the correctness and efficiency of the algorithm is founded through some examples which are fundamental in structural analysis.

• The Journal of the Korea institute of electronic communication sciences
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• v.13 no.1
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• pp.1-8
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• 2018

It is the content and scope of this study to analyze the problems of the current wireless service and the classification system of the radio station, and to examine the case of radio control in Japan and to establish a reasonable and efficient radio wave management plan. The results of this study can be used as basic data for reorganizing the legislation on radio wave enforcement ordinance, radio services and radio station classification standards. It is expected that it will be possible to improve the compliance and efficiency of the radio station licensing and inspection service while enhancing the policy compliance in the practical work by providing detailed explanations on the definition and classification system of the new radio task / radio station in the future.

• Annual Conference on Human and Language Technology
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• 2007.10a
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• pp.107-113
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• 2007

본 연구는 시맨틱 데이터 정합성 검사와 RDF 트리플 생성 기능을 가진 URI 서버 내 DB 스키마의 자동 생성 방안을 기술한다. URI 서버는 시맨틱 웹 기술 기반 프레임워크 구성에 필요한 핵심 엔진으로서 인스턴스 생성 관리기, 검색 엔진, 추론 엔진 등과의 상호 작용을 통해 시맨틱 데이터를 서비스한다. 도메인이 바뀌거나 서비스가 변경되는 경우 DB 스키마를 전문가에 의해 수작업으로 생성함으로써 서비스 환경 변화에 즉각 대응하지 못하는 문제점을 가진 기존 URI 서버를, 적재되는 온톨로지에 따라 DB 스키마를 동적으로 자동 생성하는 방식으로 변경함으로써 다양한 응용 분야와 도메인에의 높은 이식성(Portability)을 보장할 수 있도록 한다. 기반정보 온톨로지, 응용 온톨로지, 개인화 온톨로지 등 3개 온톨로지 스키마와 11만 건 이상의 Citeseer Open Access Metadata로부터 추출된 인스턴스를 대상으로 한 실험을 통해 URI 서버 내 DB 스키마 자동 생성 가능성을 실증하였다.

• The Transactions of the Korean Institute of Electrical Engineers D
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• v.53 no.5
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• pp.345-352
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• 2004

Currently, high data rate PLC(Power Line Communications), up to 100 Mbps, which use frequency bandwidth between 2 MHz and 30 MHz is investigated very hard, and commercial PLC modem for low voltage powerline network (indoor) is coming soon into communication market. For the purpose of developing a fit communication system which has little distortion of signal and attenuation, it is surely necessary to know about channel environments of powerline. Especially, the impedance measurement of the powerline and impedance matching are very important. As is known, since medium-voltage powerline (22.9 ㎸) is still working, it is not so simple to measure the powerline impedance. In our study, a portable impedance measurement equipment is developed. It consists of coupling capacitor, a drain coil and impedance matching transformer. The equipment is easily connected to medium voltage line and impedance of power line is measured using a network analyzer. Also, measurement results are used for impedance matching of PLC signal. In fact, matching transformer with several different impedances are used. The matching transformer is connected between coupling capacitor and signal port. In this paper, the developed portable impedance measurement equipment and impedance measurement results are presented. Also impedance matching technique using matching transformers will be explained. We showed the result of the improved performance by the impedance matching.

• Journal of the Korea Institute of Information Security & Cryptology
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• v.23 no.3
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• pp.395-404
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• 2013

A pattern matching algorithm plays an important role in traffic identification and classification based on predefined patterns for intrusion detection and prevention. As attacks become prevalent and complex, current patterns are written using regular expressions, called regexes, which are expressed into the deterministic finite automata(DFA) due to the guaranteed worst-case performance in pattern matching process. Currently, because of the increased complexity of regex patterns and their large number, memory-efficient DFA from states reduction have become the mainstay of pattern matching process. However, most of the previous works have focused on reducing only the number of states on a single automaton, and thus there still exists a state blowup problem under the large number of patterns. To solve the above problem, we propose a new state compression algorithm that merges states on multiple automata. We show that by merging states with the same input character on multiple automata, the proposed algorithm can lead to a significant reduction of the number of states in the original DFA by as much as 40.0% on average.

• Journal of the Economic Geographical Society of Korea
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• v.23 no.3
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• pp.197-208
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• 2020

This study attempts to identify the structure of class conflict in Korea and to suggest an alternative framework for a empathetic society. The objective and subjective level of satisfaction with life and class consciousness are in direct proportion, and status consistency signifies polarization. Distorted distribution structures and cultural values make income disparity and property disputes widen, which in turn lead to educational divides and status fixations, refracting or blocking the possibility of social mobility. By overcoming the COVID-19 crisis, it is not appropriate to go back to the past but to correct wrong consciousness and practices in the past, and the consistency between the state and members of society must be re-established. Through the process of innovation at the economic, global, and digital level, a major transformation is required in the new normal era, which prioritizes social development for human values. The conflict resolution depends on the solidarity of the community as a social foundation, since an empathetic society needs the trust and communication of the members of the society.

• Journal of the Society of Disaster Information
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• v.8 no.3
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• pp.267-275
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• 2012

Long-term national railway building comprehensive review of the proposal had 100 in railway history, railway rail network plan. Planning routes for establishing a plan, but, considering the rail network, the plan was that could with the very important meaning in the What more economical route considering the costs and benefits of building a rail network under budget constraints, went through the process of background lines of business unit interval expenses to adopt a business unit interval. Especially in building the railway network, as well as the road plan was to reflect in order to build for the future railway facilities was secured examine the possibility of possible budget commitment. Budget of securing the transportation tax, gasoline tax, and other transportation facilities in order to secure and commit the current funding approach and Review Bodu possible budget scenarios based on it written. Was also enforce rail system built in reviewing the demand more than anything that can take advantage of the railway distance by railway and the merits of the competition means to compete in the form of the assumed situation. The rail network deployment plan, considering this was discussed, based on the results of the plan to establish the first annual or period of the plan change was based on the budget that was unknown.

• Journal of the Korean Society of Surveying, Geodesy, Photogrammetry and Cartography
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• v.36 no.4
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• pp.235-243
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• 2018

The national geodetic control point is very important as a framework for drafting plans for construction and civil engineering works as well as mapping for various development and utilization plans related to the national land. Since the 1910s, Korea has established and managed the national geodetic control points, the triangulation points and the benchmarks. Currently, these point information is provided through the land information platform. The national geodetic control point has been changed through the process of loss, re-establishment, and re-location by the events and environment of the times. Therefore, it is very important to provide information by linking these past national geodetic control points in time series. In this study, we classified the triangulation points into five groups(Japanese Government General of Korea, YUCCA Project, National Construction Institute, Past Control Point Data Sheet, and Current) by age and then suggests a method to match the same control points in each time period. Finally we also applied the proposed method to Jecheon and analyzed the results.

• Journal of Software Assessment and Valuation
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• v.16 no.1
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• pp.1-11
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• 2020

The March 29, 2016, amendment to the Civil Procedure Act introduced changes to the appraisal procedures, including new obligations for appraisers, changes in the modes of appraiser testimony, and questioning of appraisers through video conferencing, with all seemingly aimed at procedurally addressing the issues with appraisal in the context of court proceedings. The changes introduced by the amendment also affect the appraisal procedures for copyrights. In light of the above, this article examines how the amendment to the Civil Procedure Act affects the appraisal procedures for copyrights. Specific issues covered by this paper include: appointment of additional appraisers, prohibition of delegated appraisal, operation of the multiple appraisal system, disclosure of participating experts, proximity of the appraiser system, and congruence of areas of expertise.