• Journal of KIISE:Computing Practices and Letters
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• v.5 no.2
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• pp.273-282
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• 1999

범국가적으로 지리정보시스템(GIS : Geographic Information System) 구축작업이 활성화되고 있는가운데 정부에서는 국가정보화 기반조성 차원에서 전국에 걸친 국가기본도 수치지도화 사업을 추진하고 있다. 국가기본도는 설비관리용 GIS를 구축하려는 국내 각 수요기관에서 활용되어져 GIS DB구축작업이 용이해질 것으로 예상되지만, 국가기본도에서는 각 기관에서 관리하고자 하는 모든 설비정보가 포함되어 있는 것은 아니므로 세부적인 관리대상설비의 추가 입력작업이 필요하다. 설비정보 입력은 대체적으로 각 기관에서 자체 보유하고 있는 설비도면을 기준으로 수행되지만 국가기본도와 설비도 간에는 기초 도면에 다름에 따른 설비위치 상대오차가 발생된다. 국가기본도 사용을 전제할 때 이러한 문제점은 피할수 없는 현상이며, 상대위치를 보정시키면서 관리대상 설비를 입력하려면 많은 예산과 인력이 소요될것으로 예상된다. 배전설비관리 GIS를 구축하고자 하는 한전에서는 이를 효과적으로 해결하고자 기초도면 변경에 따른 설비위치 자동보정기법을 연구하여 이를 기반으로한 시스템 개발을 완료하였다. 개발된 시스템의 정확도 및 실용화 가능성을 확인하기 위해 설비위치의 기준이 되는 전력주를 대상으로 샘플지역을 선정하여 자동보정을 실시하였으며, 현장실사를 통한 검증을 실시한 결과 약 94.6%에 달하는 보정 결과 만족도를 얻을 수 있었다.

• Journal of KIISE:Computer Systems and Theory
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• v.28 no.1_2
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• pp.80-89
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• 2001

The development in the mobile computing systems have arisen new and previously unforeseen problems, such as problems in information management of mobile host, disconnection of mobile host and low bandwidths of wireless communications. Especially, location information management strategy of mobile host results in an increased overhead in mobile computing systems. Due to the mobility of the mobiles host, the changes in the mobile host's address depends on the mobile host's location, and is maintained by mapping physical address on virtual address, Since previously suggested several strategies for mapping method between physical address and virtual address did not tackle the increase of mobile host and distribution of location information, it was not able to support the scalability in mobile computing systems. Thus, to distribute the location inrormation, we propose an advanced n-depth LiST (Location information Search Tree) and the parallel location search and update strategy based on the advanced n-depth LiST. The advanced n-depth LiST is logically a hierarchical structure that clusters the location information server by ring structure and reduces the location information search and update cost by parallel seatch and updated method. The experiment shows that even though the distance of two MHs that communicate with each other is large, due to the strnctural distribution of location information, advanced n-depth LiST results in good performance. Moreover, despite the reduction in the location information search cost, there was no increase in the location information update cost.

• The Journal of Korean Institute of Communications and Information Sciences
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• v.24 no.8B
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• pp.1444-1455
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• 1999

In the standard location strategy such as IS-41 and GSM, Home Location Register(HLR) and Visitor Location Register(VLR) databases are used to manage the location of mobile terminals. The primary goal that location management schemes investigate is to reduce the cost of database access and the traffic for signaling network. When mobile terminals move frequently, one of problems in the standard location management scheme is that HLR database is highly updated and the traffic in signaling network can be occurred significantly due to high message transfer rate between HRL and VLR. As a solution to these problems, this paper proposes the location management scheme using VLR Gateway(VG) to reduce the both traffics of HLR update and signaling network which are resulted from location registration requirements of mobile terminals whenever they cross their registration area boundary. VG is a kind of database that is placed between HLR and VLR. It integrates one or more registration area defined in a system into one group and plays a role on behalf of HLR in a integrated registration scope so that the call delivery and the movement of mobile terminals are possible without HLR access in the scope. In order to evaluate performance of IS-41 and proposed scheme, we simulate two schemes based on wide range of call to mobility ratio. Its experiment result shows that in the proposed scheme total database cost increased slightly whereas HLR and signaling traffic decreased remarkably.

• Journal of Korea Multimedia Society
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• v.12 no.9
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• pp.1242-1251
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• 2009

A DSMS(Data Stream Management System) in ubiquitous environment processes huge data that input from a number of sensor. The existed system is used with a load shedding method that is eliminated with a part of huge data stream when it doesn't process the huge data stream. The Load shedding method has to filter a part of input data. This is because, data completeness or reliability is decreased. In this paper, we proposed the overload prediction load balancing to maintain data completeness when the system has an overload. The proposed method predicts the overload time. and than it is decreased with data loss when achieves the prediction overload time. The performance evaluation shows that the proposed method performs better than the existed method.

• Journal of the Korean Society for information Management
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• v.21 no.3
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• pp.251-267
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• 2004

The purpose of this study is to generate the local level knowledge structure of a single document, similar to end-of-the-book indexes and table of contents of printed material through the use of term clustering and cluster representative term selection. Furthermore, it aims to analyze the functionalities of the knowledge structure. and to confirm the applicability of these methods in user-friend1y information services. The results of the term clustering experiment showed that the performance of the Ward's method was superior to that of the fuzzy K -means clustering method. In the cluster representative term selection experiment, using the highest passage frequency term as the representative yielded the best performance. Finally, the result of user task-based functionality tests illustrate that the automatically generated knowledge structure in this study functions similarly to the local level knowledge structure presented In printed material.

• Korean Journal of Construction Engineering and Management
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• v.5 no.5 s.21
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• pp.143-150
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• 2004

Nowaday, The tendency of complexity and extension of construction fields increase the need for efficient works managements like a construction management. Consequently, by the introduction of Decision-Making Theories, researches for improving construction field's efficiencies are actively performed. Fuzzy Analytical Hierarchy Process method is invented, so that describes a decision maker's ambiguous linguistic judgment with fuzzy numbers. but most of researches on Fuzzy-AHP use symmetric triangular fuzzy function for estimating each evaluation item with the consequence that exact judgments are impossible. those limits are caused by the point that employed fuzzy ranking methods can not support dissymmetric fuzzy numbers. In this research, we aims to overcome this problem with R.P.R(Relative Preference Ratio) method and suggest improved Fuzzy-AHP method which can use dissymmetric fuzzy triangular numbers.

• Journal of the Korea Academia-Industrial cooperation Society
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• v.16 no.9
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• pp.6368-6375
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• 2015

The goal of this research is to identify the energy planning techniques of Smart Green City and to establish the realized plan through the analysis of Multi-functional Administrative City. For the research, eighteen planning techniques were derived and categorized into three sectors and six basic direction through literature review and Brain-storming analysis considering correlation between three goals of Smart Green City and expectation of planning technique. And Multi-functional Administrative City was analyzed for the current status of application of planning techniques focus on two application aspects. In conclusion, 'Establishing Integrated Management Center for Urban Energy', 'Building Energy Management System', 'Building Automation System', 'Green Transport System', 'Intelligent Transport System', 'Introduction of Eco-friendly Transportation' planning techniques in reduction of building energy consumption sector and green-intelligent transport system sector were identified as important techniques for Smart Green City.

• Journal of the Korea Computer Industry Society
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• v.6 no.3
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• pp.559-566
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• 2005

ALTIBASE is the relational main memory DBMS that enables us to develop the high performance and fault tolerant applications. It guarantees the short and predictable execution time as well as the basic functionality of conventional disk-based DBMS. We present the overview of system architecture and the performance analysis with respect to the various design choices. The assorted experiments are performed under the various environments. The results of TPC-H and Wisconsin benchmark tests are described. We illustrate the various performance comparisons under the various index mechanisms, the replication models, the transaction durabilities, and the application structures. A performance study shows the ALTIBASE system can be applied to the wide area of industrial DBMS fields.

• Annual Conference of KIPS
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• 2020.05a
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• pp.28-31
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• 2020

한정된 고성능 자원을 여러 사용자들에게 제공해야하는 슈퍼컴퓨터와 같은 시스템은 제한된 기간 내에 보다 많은 양의 작업이 실행되도록 시스템 활용률을 높이는 방안이 필요하다. 이를 위해 시스템 관리자가 수행할 응용 프로그램에 대한 사전 정보를 파악하는 것이 유용하다. 대부분의 고성능 컴퓨팅 시스템 운영에 있어 작업을 실행할 때 사용자로부터 실행 기간 자원 요구사항들에 대한 정보를 제공 받거나 시스템 사용 통계 값을 사용하여 필요한 정보를 생성하는 등의 프로파일링 기술을 바탕으로 시스템 활용률을 높이는데 활용하고 있다. 본 논문의 선행연구에서 하드웨어 성능 카운터를 이용하여 응용 특성 분석을 실행하고 이 결과를 바탕으로 작업 스케줄링을 최적화하는 기술을 개발한 바 있다. 본 논문에서는 슈퍼컴퓨터 최적 실행 지원을 위한 프로파일링 테스트베드를 구축하고 단일노드를 기반으로 분석한 응용 프로그램 특성 결과를 활용한 스케줄링 최적화 기법이 확장성 있게 동작함을 보이고자 하였다. 또한 중규모 클러스터에 개발한 스케줄링 최적화 기법을 적용한 결과 전체 응용 프로그램이 실행 시간을 단축함으로써 최대 33%의 성능 향상 효과를 얻었다.

• Proceedings of the Korean Institute Of Construction Engineering and Management
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• autumn
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• pp.104-112
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• 2003

우리나라의 건설산업은 70년대에서부터 지금까지 압축된 경제성장 과정을 거치면서 인구의 도시 집중화 현상에 따른 엄청난 물량의 아파트 건설로 숨가쁘게 물량 공급에만 급급해 왔지 상대적으로 건설시공의 효율성과 합리적인 건설관리에는 소홀하여 왔다. 이는 곧 반복되는 부실시공과 대형 건설재해를 유발시켜 건설업에 대한 대중적인 이미지 실추는 물론 품질과 안전관리가 국가적인 위신문제로까지 대두되게 되었다. 이러한 시접에서 건설산업의 문제점을 풀어나가기 위한 개선책으로 등장하게 된 것이 CM이라고 생각한다. CM을 통하여 설계와 시공을 통합관리하고 현장 시공과정에 내포되어 있는 부실 요인을 찾아내어 제거하고 시정조치하고 이를 유사 Project에 Feed-back시킴으로써 점진적인 향상(Progressive Improvement)을 이루어내며 제약된 자원을 효율적으로 이용하여 원가를 절감함으로써 건설산업의 경쟁력을 강화시켜 나가는 것이 곧 CM 활용의 효과라 할 수 있을 것이다. 본 논문은 15년간 현장소장(Project Manager)의 경험을 바탕으로 CM기법을 건설현장에 적용 사례한 결과를 정리한 것이다.