• Journal of the Institute of Electronics and Information Engineers
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• v.51 no.2
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• pp.85-91
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• 2014

Cloud storage system uses a distributed file system for storing and managing data. Traditional distributed file system makes a triplication of data in order to restore data loss in disk failure. However, enforcing data replication method increases storage utilization and causes extra I/O operations during replication process. In this paper, we propose a data replication method using erasure codes in cloud storage system to improve storage space efficiency and I/O performance. In particular, according to data access frequency, the proposed method can reduce the number of data replications but using erasure codes can keep the same data recovery performance. Experimental results show that proposed method improves performance in storage efficiency 40%, read throughput 11%, write throughput 10% better than HDFS does.

• Journal of the Korean Society of Surveying, Geodesy, Photogrammetry and Cartography
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• v.25 no.5
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• pp.427-436
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• 2007

Because the slope made up the construction of any other facilities, has many risks of a collapse, existing inspection methods to collect information for a construction site of slope bring up a long time of inspection period, cost and approach for a measuring instrument and it presents the critical point of collecting materials. For getting images to use zoom lens in any positions this study will use free zoomer constructed values of data classified by the focal length develop Image Loader system to make it load not only camera information but also camera test data values of the focal length took a photograph automatically if it measure to use a variety of cameras or other lens. Also, as it constructs three dimensions spatial image information from images of obtained objects this study presents effective basic materials of slope surveying and inspection and it shows exact surveying methods for dangerous slope not to access.

• The KIPS Transactions:PartD
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• v.9D no.1
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• pp.43-56
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• 2002

Most of works have been performed on representation of spatiotemporal objects from various points of view. Most of them represent spatiotemporal objects using approaches from GIS, temporal databases, object-oriented databases or data type. Spatiotemporal objects can be classified as objects whose position and shape changes discretely over time, objects whose position changes continuously and objects whose shape changes continuously as well as position. Previous works on spatiotemporal model have focused on only one of them. In this paper, we propose a spatiotemporal model that can represent three types of objects in Euclidean plan. For this purpose, we represent both discrete and continuous moving objects by defining temporal model extended from valid time and by defining relationship between two consecutive versions of objects. The proposed spatiotemporal object model is based on open GIS specification so that it has compatibility with existing spatial data model.

• Journal of the Korea Convergence Society
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• v.13 no.3
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• pp.163-172
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• 2022

The purpose of this study is to present implications in the planning and design methodology for revitalization of public spaces for mixed-use residential building. For the purpose, I have taken a literature research and a site analysis with cases of 'Kyungsung Univ.·Bukyung Nat'l Univ. Station'-area in Busan City. The analysis framework was consist of spatial composition, street facilities, use behavior, and connection with the street. The result of this study is as follows; 1) It is needed to consist of an empty space practically usable in an open location that is easy to access by the general public. 2) Considering the use of people, it is needed to install street furniture that can actually be used for rest. 3) It is needed to make a plan and design that considers the access and use of the general public and the space through it. 4) It is needed to create a synergistic effect in the integration of the street and the public space and the linkage with the street through this.

• The Journal of the Convergence on Culture Technology
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• v.7 no.4
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• pp.751-757
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• 2021

In this paper, we proposed a pipeline system for holographic image production in a web server-based environment. There are time and spatial constraints for the existing holographic image production. The purpose of the proposed system is to obtain high-quality holographic images by reducing accessibility to users. It is a structure in which a video captured by a user in a web environment is transmitted to a server and converted into a frame for holographic image production through post-production. For high-quality holographic image acquisition, post-processing uses a deep learning-based algorithm. The proposed system provides various service tools in the web environment for user convenience. Through this method, the user's accessibility is improved when producing holographic images because images are taken in a web environment rather than in a limited space.

• The Journal of the Convergence on Culture Technology
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• v.10 no.1
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• pp.465-470
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• 2024

Kitchen cabinets are widely used for their spacious storage and efficient use of space, but their high installed location makes it difficult for the elderly and disabled to access. Therefore, in this paper, we propose a new height-adjustable kitchen cabinet that can be used more easily and safely. The lift-down range of cabinet was set considering the installation location of cabinet for efficient use of kitchen space and the maximum height accessible to the elderly and disabled, and the link geometry and driving method of the complex link mechanism were determined through the mechanism design procedure to ensure that the selected floor come down safely along the optimal descend path. In addition, the appropriate motor and control algorithm were added to allow the user to descend to the desired height with a simple button operation. It was confirmed through actual production that the proposed linkage mechanism performs the desired lift-down motion.

• Journal of the Korean Geographical Society
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• v.38 no.5
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• pp.849-860
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• 2003

City's inhabitants should be able to utilize a variety of urban infrastructures and public facilities in a way of possessing the convenience, amenity, and safety of urban life. Most of the city government, however has established a policy for making and providing urban park facilities based on a very simple quantitative criteria rather than the qualitative criteria such as appropriateness, utility, accessibility, equity so far. Especially in the case of urban neighborhood parks, the usefulness to the inhabitant and accessibility to the parks may be questionable. In this study, we intended to analyze the spatial equity and distribution characteristics of urban neighborhood parks and to select several potential facility sites required in the study area using GIS's spatial analysis functions. Finally this study analyzes the possible location of an urban neighborhood park in terms of objective criteria and AHP techniques.

• Proceedings of the Korea Water Resources Association Conference
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• 2007.05a
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• pp.2019-2023
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• 2007

그동안 우리나라의 하천관리는 홍수피해 경감과 용수공급이라는 단순한 이 치수 위주로 관리해 왔다. 수자원개발사업이 본격적으로 시작된 1960년대 이후 상류 지역에 다목적댐들이 건설되었으며, 이러한 하천관리는 국토를 효율적으로 활용할 수 있게 함으로써 압축성장의 원동력이 되었다. 경제가 성장함에 따라 생활이 윤택해지고, 또한 환경의식이 향상됨에 따라 하천관리도 이제까지의 이 치수 위주에서 벗어나 하천 고유의 생태계 보존과 휴식 친수공간으로서의 중요성이 부각되고 있다. 본 연구에서는 하천의 친수성과 접근성을 제고할 수 있는 방안으로 유역 상류의 댐에서 하천유지용수를 공급하는 방안에 대해서 검토 분석하였다. 댐은 홍수시 하류지역의 홍수피해를 줄이는 역할 뿐만 아니라 하천환경이 악화되는 갈수기에 수질 개선용 물을 흘러 보내는 역할을 함으로써 수질을 개선하고 자연상태의 친수공간을 만들 수 있다. 오염되고, 건천화된 하천의 친환경적인 관리를 위해서는 상류 댐에서 하천유지용수를 최대한 확보하는 것이 가장 효율적인 방안으로 사료되며, 댐의 계획 운영 등에 대하여는 지속적인 연구가 있어야 할 것이다.

• Proceedings of the Korean Institute of Navigation and Port Research Conference
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• 2011.06a
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• pp.206-208
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• 2011

플로팅건축물은 최근 지구온난화에 따른 해수면의 상승, 소득 증대 및 관광행태 변화에 따라 급증한 해양 레포츠 수요에 대응하는 효과적인 건축물이다. 플로팅건축은 프로그램, 형태, 건축규모, 층수, 위치, 접근방법, 이동성, 에너지 자립도 등 8가지 기준에 따라 유형 구분이 가능하다. 또한 시공된 주거시설을 대상으로 분석한 결과 플로팅건축의 디자인 특성은 (1) 2층 규모, (2) 면적 비율이 높은 데크, (3) 장방형의 균형감 있는 매스, (4) 조망 극대화, (5) 친수공간 확보, (6) 공간의 통합적 사용 및 합리적 면적 배분의 평면계획, (7) 수면 반사를 고려한 단면계획, (8) 모듈화 및 유닛화 등으로 정리할 수 있다.

• Journal of the Korean Institute of Intelligent Systems
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• v.16 no.2
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• pp.144-149
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• 2006

This paper deals with a balanced model reduction for uncertain nonlinear systems via T-S fuzzy approach. We define a generalized controllability/observability gramian and obtain a balanced state space model using generalized gramians which can be obtained from solutions of linear matrix inequalities. We present a balanced model reduction scheme by truncating not only state variables but also uncertain elements. An upper bound of the model reduction error will also be suggested. In order to demonstrate the efficacy of our method, a numerical example will be presented.