• 한국방재학회:학술대회논문집
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• 2011.02a
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• pp.184-184
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• 2011

선로의 레일은 재료적인 특성과 현장의 많은 주변 요소에 의한 불확실성이 매우 높은 시스템으로 결함의 위험이 상존한다. 결함 발생과 조치에 따라 영업손실로 이어지므로 레일 결함 발생과 동시에 적절한 조치가 요구된다. 따라서 레일결함 발생 시 레일교환시기를 파악하는 것이 선로관리비용을 줄일 수 있으며 레일교환에 대한 신속한 판단을 위함 관리기준을 정립하는 것이 요구된다. 현재 국내에서 고속선의 경우 관리 기준이 있으나, 일반철도는 없는 실정이다. 본 연구는 차후 일반철도 180km/h 속도상승을 계획하고 있는 현 시점에 국외 관리기준을 분석하여 결함관리기준을 정립에 기여하고자 한다. 국내의 경우, 2004. 4. 1 프랑스 기술을 전수받아 개통한 고속선은 프랑스 레일관리기준을 적용한 "레일손상 등급별 관리기준"을 제정하여 레일관리를 시행하고 있다. 국외의 경우, INNOTRACK프로젝트 안에서 관련된 다른 IM(Infrastructure Managers, 사회기반시설 관리자들)에게 최근의 활동과 변화의 이해를 제공하기 위해서, 선택된 결함들의 최소조치들의 조사가 Network Rail, OBB, Prorail, Banverket 그리고 DB에서 수행되고 있으며 UIC 지침에도 포함되고 있다. 모든 최소조치 원칙은 초음파나 육안에 의해 발견된 길이나 초음파 또는 와류탐상기(eddy current system)를 이용한 깊이에 대한 제한(limits)을 준다. 또한 침목과 이음매 또는 용접부에 관한 위치에 관한 결함의 제한이 있다. 명시된 기간은 즉각적일 수도 있으며, 보통 속도 제한이나 비상 죔쇠(Clamps)같은 경감시키는 수단에 적용될 수 있으며, 또는 더 긴 기간이 될 수도 있다. 더 긴 기간들은 수리나 레일 교체를 통하여 선로로부터 결함이 제거되어야 하는 최대의 시간이다. 본 연구에서는 Transverse Breaks, Squats, Head Checks 3가지 결함 유형에 대해 각 국에서 사용하는 최소 조치를 비교하여 분석하였다. 분석결과, 유럽에서는 레일결함에 대하여 깊이 있는 연구를 통하여 관리기준을 정하여 관리하고 있으며 이에 따라 상세하고 구체적인 레일 관리가 가능하므로 효율적이며 안전성이 제고되는 것으로 판단된다. 차후 일반철도의 180km/h 속도상승을 계획하고 있는 현 시점에서 국내철도 일반선 여건에 적합한 레일결함관리기준을 정립하기 위한 추가적인 연구가 필요할 것으로 판단된다.

• Journal of the Korean Society for information Management
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• v.21 no.2
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• pp.189-210
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• 2004

The purpose of this study is to evaluate the performance of XML retrieval based on ORDBMSs(Object-Relational Database Management Systems) approach. This paper describes indexing and retrieval methods for XML documents and the methodologies of experiments at INEX(Initiative for the Evaluation of XML retrieval). Like any other traditional information retrieval experiment, the test collection was consists of documents, topics/queries, task, relevance assessments and evaluation. EXIMA$^{TM}$ Supply, a kind of native XML DB based on ORDBMS technologies, is used for this experiment. Although this approach has many benefits, for example, no delay in storing and searching XML documents. but it showed relatively disappointed retrieval performance at INEX 2002. This result may caused since the given topics had to be decomposed and modified to be processed by the XPath processor, and during this modification the original meaning of topics can be changed inevitably and some important information nay pass over.r.

• Journal of the Korean Society of Surveying, Geodesy, Photogrammetry and Cartography
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• v.17 no.1
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• pp.1-10
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• 1999

Landuse information is base data being applied as common database in the process of executing urban project service and is very available. But, the progress of business on landuse information building is deficient yet. In this study, we'd like to deal with landuse information projet that is the base of urban project, many landuse information building and the method of extraction of efficient second-information. Also, we built system to apply actively landuse information for urban projectors. And, we'd like to present the model on urban landuse classification system that wouldn't be standard yet by studying the method of urban landuse pattern using landuse in-formation being built. Also, we can evaluate if the model of urban landuse pattern comes up to present landuse. We can expect it is a base data by extracting unsuitable area from present landuse efficiently when we construct landuse project.

• Journal of the Korean Society for information Management
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• v.25 no.1
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• pp.129-148
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• 2008

Analyzing out the Key Tasks and Developing the Professional Type of National Librarians through Job Analysis was made, because improving the professionalism of librarians is the strategy of survival in the competency based society. It is composed of 22 duties, 216 tasks of national librarian job and 96 key tasks is extracted among them. As the results, 12 types of professional librarian which is composed 10 function oriented types, and 2 user oriented types, is suggested: collection development librarian, cataloger taxonomist, information service librarian, reading coach, research librarian of international standards, database & system manager, international work librarian, national support librarian, marketing librarian, library literacy librarian, children' librarian, handicapped service librarian.

• Journal of the Korean Society for information Management
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• v.30 no.3
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• pp.297-315
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• 2013

Anyone curious to easily access and learn Korean history has become interested in Korean history data bases, which will provide accurate and reliable historical information. Furthermore, user demands for information sharing and reusability, available through setting up a semantic web, have been increased, which have taken the shape of linked data. Efforts have been made to construct public data bases containing readily usable contents a user can understand and utilize with ease. They have been produced by several organizations, portal sites, and individuals, trying to deviate from existing mainstreams - expert-based text data bases. A problem with those data bases is that they have not considered such vital factors as the sharing and utilizing of information as a whole. This study suggests a LOD-based Korean history contents implementation system, providing rich information environment by way of multi-dimensional web-data connections. In doing so, this system has tried a historic information circulation service system which is based on information sharing and connecting.

• Journal of KIISE:Software and Applications
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• v.26 no.9
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• pp.1061-1072
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• 1999

한 개 이상의 사이트에 공간 데이타가 중복 저장된 분산 공간 DB에서, 동시에 수행될 수 있는 긴 트랜잭션의 변경은 일관성 제어를 위해 다른 사이트에 전파되어야 한다. 이때 같은 영역의 공간 데이타를 서로 다른 사이트에서 동시에 변경할 경우, 변경 상충 문제가 발생하거나 잠금 기법에 의한 오랜 대기 시간이 초래되는 문제가 있다. 또한 공간 객체는 잠금의 대상이 아닌 공간 관련성에 의한 종속성을 가진다.이 논문은 긴 트랜잭션으로 중복된 공간 데이타를 변경할 경우 중복 제어를 위한 변경 전파와 동시성 제어 문제를 다룬다. 중복된 공간 데이타의 변경 병렬성을 향상시키기 위해 영역 잠금 및 SR-bound WRITE 잠금 기법을 제시한다. 한 사이트에서 수정하는 객체들과 다른 사이트에서 수정하는 객체들 사이에 공간 관련성에 의한 종속성이 없을 경우 병렬 수정을 허용하도록 제어하며, 공간 관련성에 의한 종속성이 있을 경우 SR-based 2PC라 불리는, 확장된 2단계 완료 프로토콜로 협동작업을 수행해서 변경 상충을 해결하는 새로운 중복 제어 기법을 설계하고 구현한다.Abstract The update of a long transaction should be propagated to the other sites for consistency control, when spatial database are replicated at multiple sites to achieve availability, reliability, and performance. When the replicated spatial data are updated at the same time, the update of one site would be conflicted with the other or a user would not be able to access the replicated spatial data under the control of locking. Two spatial objects having spatial relationships should be cooperatively updated even if there are no conflicts of locking for them.This paper deals with the issues of concurrency control and update propagation of replicated spatial data. We present the concept of region lock and SR-bound WRITE lock for enhancing the parallelism of updating the replicated spatial data. If there are no spatial relationships between one site's objets and the other's objects, parallel update would be allowed. Concurrent update of two spatial objects having spatial relationships should be propagated and cooperated by using an extended two-phase commit protocol, called spatial relationship-based 2PC.

• Spatial Information Research
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• v.21 no.1
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• pp.15-22
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• 2013

Recently, there are various attempts to construct a u-City and a smart city. A Spatial information as the city-based infrastructure has been recognized as an essential element. In many cases GIS data being lack of compatibility due to the various format, it is difficult to provide public web services and link the data between government organizations. In this study, we developed a interconnection Server based on OGC standardization to support interoperability in a heterogeneous distributed environment. we hope the interconnection server that will be utilized as u-City platform and response platform for volcanic disaster through the test in the test-bed.

• Journal of the Korean Association of Geographic Information Studies
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• v.11 no.3
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• pp.118-126
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• 2008

The purpose of this study is to suggest the way of analyzing land uses to utilize GIS in the field of urban planning. The Busan Land Information System was built in early 2000s. The building data were used by digital map(1:1,000). And building register data in 2001 were utilized as the attribute data. Also, by calculating specialization factor, we distinct the characteristic of every land use of the city, and it compares every land use zone. This study calculated and compared an observation frequency and an expectation frequency of every building use and land use zone. We found that the use of the building tend to be controlled and guided by the land use zone.

• Journal of the Korean Geotechnical Society
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• v.28 no.5
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• pp.55-65
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• 2012

The purpose of this study is to estimate seismic damage for harbor site considering dynamic amplification characteristics. First of all, a series of ground response analysis is performed and then correlation equations between rock outcrop accelerations and peak ground accelerations (PGAs) are determined. These equations are saved into DB and when an earthquake occurs, PGAs are determined by them as soon as possible. For earthquake events, seismic damage grades of harbor structures are determined by using the correlated PGAs and fragility curves of harbor structures in real time. In this study, seismic damage was estimated and classified into several grades by applying two hypothetical earthquakes.

• Journal of the Korea Institute of Information and Communication Engineering
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• v.4 no.2
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• pp.443-451
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• 2000

Until now, there have been various kinds of science information databsae which databased the science technology information, but they do not satisfy the aspiration of the users. Therefore, in the position of the users, it suggests the technology information space as a now paradigm, which supplement the function of science information DB. ICPIS which inputs described papers with keywords, offers the itemized summary of these contents, the visual indication and comparison of similar thesis, and it also supplises the abundant summary information, survey information, more than ten volumes of info communication thesis with starting the casual relation extraction for the users, playing a significant role in ICPIS is called KP, and it is package of domain knowledge that unifies the extraction and structure narration of the technology information. ICPIS extracts the technology information among the thesis that are deserved by the natural language treatment in the itemized KP keywords described, and form the prescribed summary structure in KP.