• Journal of KIISE:Computing Practices and Letters
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• v.8 no.6
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• pp.679-691
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• 2002

Volume visualization is an important subarea of scientific visualization, and is concerned with techniques that are effectively used in generating meaningful and visual information from abstract and complex volume datasets, defined in three- or higher-dimensional space. It has been increasingly important in various fields including meteorology, medical science, and computational fluid dynamics, and so on. On the other hand, virtual reality is a research field focusing on various techniques that aid gaining experiences in virtual worlds with visual, auditory and tactile senses. In this paper, we have developed a visualization system for CAVE, an immersive 3D virtual environment system, which generates stereoscopic images from huge human volume datasets in real-time using an improved volume visualization technique. In order to complement the 3D texture-mapping based volume rendering methods, that easily slow down as data sizes increase, our system utilizes an image-based rendering technique to guarantee real-time performance. The system has been designed to offer a variety of user interface functionality for effective visualization. In this article, we present detailed description on our real-time stereoscopic visualization system, and show how the Visible Korean Human dataset is effectively visualized on CAVE.

• Proceedings of the Korean Information Science Society Conference
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• 2012.06d
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• pp.21-23
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• 2012

최근 안드로이드 플랫폼을 탑재한 스마트폰이 널리 보급되면서 안드로이드 플랫폼에 대한 관심은 더욱 커지고 있다. 하지만 안드로이든 스마트폰은 종종 양질의 사용자 응답성을 제공하지 못하는 것으로 알려져 있다. 이는 안드로이드 상에서 대화형 태스크가 다른 태스크와 구별되지 않고 동일한 우선순위로 스케줄링 되기 때문에 사용자 입력을 처리하는 동안 여러 번의 선점을 당해 긴 응답시간을 초래할 수 있기 때문이다. 이 논문은 안드로이드 스마트폰의 사용자 응답성 향상을 위해 프레임워크 지원 우선순위 부스트 기법을 제시한다. 제안된 기법은 프레임워크 레벨에서 대화형 태스크를 식별하고 이를 커널에게 전달하며, 커널 레벨에서는 식별된 태스크의 우선순위를 선별적으로 부스트 시킴으로써 선점 없이 사용자 입력을 처리할 만큼 충분한 시간을 보장해 준다. 실험 결과는 제안된 기법이 기존 시스템보다 최대 22% 단축된 응답 시간을 보여 제안된 기법의 효용성을 입증하였다.

• Proceedings of the Korean Information Science Society Conference
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• 2006.06a
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• pp.271-273
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• 2006

현재 홈 게이트웨이의 환경에서 이 기종간의 연결 및 제어를 하기 위해서는 기존의 분산서비스 환경과는 다른 몇 가지 특성들이 고려되어야 한다. 이들 특성들은 (1)기기간의 서로 다른 통신 프로토콜로의 연결, (2)서비스가 동적으로 설치되는 컴포넌트 환경. (3)인증을 통한 웹 접근 및 효과적인 서비스 인터페이스 구성이다. 여기에서 개별적으로 존재했던 가진기기들을 디지털화하고 서로 간에 쉽게 연결할 수 있는 미들웨어인 UPnP와 Jini등 다양한 기술들이 생겨났다. 이를 통해 분산시스템을 하나로 연결 지원하는 홈 네트워크의 기술을 바탕으로 사이비 홈이라는 개념이 생겼다. 본 논문은 현재 표준화 가능성이 가장 높은 OSGi 기반하의 UPnP 서비스를 이용한 전자액자 서비스를 설계 및 구현하여 홈 네트워크 표준화의 효용성을 보이고자 한다.

• The KIPS Transactions:PartB
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• v.10B no.3
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• pp.305-310
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• 2003

In this paper we deal with the system design and development of the high-speed automatic precision inspection for the defects of bolts. In order to inspect bolts continuously, we used the conveyor system. Also, this conveyor includes the servo motor and encoder to achieve accurate movement. According to encoder signal, line-scan camera captures the line-by-line image of bolts and after one frame is accumulated, various parameters are calculated and inspected by image processing algorithms. Experimental results using the developed facilities are presented to demonstrate the efficiency of the proposed equipment.

• Journal of Korean Society for Geospatial Information Science
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• v.12 no.1 s.28
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• pp.79-85
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• 2004

The GIS(Geographic Information System) projects require big initial investment and cost of maintenance. Decision makers would not launch GIS projects unless they are convinced of the benefits of the projects. Therefore the purpose of this paper is to develop an appropriate model for GIS project evaluation. We proposed a GIS project evaluation model and summarize the steps involved in Cost-Benefit Analysis(CBA). The costs of a GIS implementation include hardware and software cost, costs of database development, training expenses, annual maintenance expenses, and other annual expenses. The benefit by using GIS has been assessed into Type I(direct benefits), Type II(indirect benefits), Type III(benefits that result from the sale of information services), Type IV(intangible benefits).

• Journal of the Korean Institute of Intelligent Systems
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• v.21 no.2
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• pp.237-243
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• 2011

Various standard terminologies in medical field are composed individually to different structure. Therefore, information on crosswalking between the terminologies is needed to combine and use the terminologies. Lots of mapping tools have been developed and used to create the information. However, since those tools deal with specific terminologies, the information is restrictly created. To overcome this problem, some tools have been developed, which perform mapping tasks by composing various terminologies. However, the tools also have difficulty of composing automatically the terminologies because the terminologies have different structures. Therefore, in this paper, we propose a method for composing and using the terminologies in the developed mapping system with keeping the original structure of the terminologies. In the proposed method, additional terminologies could be added on the mapping system and used by making metadata involving information on location and structure of the terminologies. And the mapping system could cope flexibly with the changes of the structure or context of the terminologies. Moreover, various types of mapping information could be defined and created in the system because mapping data are constructed as triplets in ontology. Therefore, the mapping data can be transformed and distributed in different formats such as OWL, RDF, and Excel. Finally, we confirmed the usefulness of the mapping system based on the proposed method through the experiments about creating mapping data.

• Journal of Intelligence and Information Systems
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• v.16 no.4
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• pp.173-193
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• 2010

The World Wide Web is transitioning from being a mere collection of documents that contain useful information toward providing a collection of services that perform useful tasks. The emerging Web service technology has been envisioned as the next technological wave and is expected to play an important role in this recent transformation of the Web. By providing interoperable interface standards for application-to-application communication, Web services can be combined with component-based software development to promote application interaction and integration within and across enterprises. To make Web services for service-oriented computing operational, it is important that Web services repositories not only be well-structured but also provide efficient tools for an environment supporting reusable software components for both service providers and consumers. As the potential of Web services for service-oriented computing is becoming widely recognized, the demand for an integrated framework that facilitates service discovery and publishing is concomitantly growing. In our research, we propose a framework that facilitates Web service discovery and publishing by combining clustering techniques and leveraging the semantics of the XML-based service specification in WSDL files. We believe that this is one of the first attempts at applying unsupervised artificial neural network-based machine-learning techniques in the Web service domain. We have developed a Web service discovery tool based on the proposed approach using an unsupervised artificial neural network and empirically evaluated the proposed approach and tool using real Web service descriptions drawn from operational Web services repositories. We believe that both service providers and consumers in a service-oriented computing environment can benefit from our Web service discovery approach.

• Journal of the Korean Association of Geographic Information Studies
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• v.9 no.2
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• pp.144-159
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• 2006

Hydrological models are tools intended to realistically represent the basin's complex system in which hydrological characteristics result from a number of physical, vegetative, climatic, and anthropomorphic factors. Spatially distributed hydrological models were first developed in the 1960s, Remote sensing(RS) data and Geographical Information System(GIS) play a rapidly increasing role in the field of hydrology and water resources development. Although very few remotely sensed data can applied in hydrology, such information is of great. One of the greatest advantage of using RS data for hydrological modeling and monitoring is its ability to generate information in spatial and temporal domain, which is very crucial for successful model analysis, prediction and validation. In this paper, SLURP model is selected as semi-distributed hydrological model and MODIS Leaf Area Index(LAI), Normalized Difference Vegetation Index(NDVI) as Remote sensing input data to hydrological modeling of Kyung An-chen basin. The outlet of the Kyung An stage site was simulated, We evaluated two RS data, based on ability of SLURP model to simulate daily streamflows, and How the two RS data influence the sensitivity of simulated Evapotranspiration.

• Journal of the Korean Society for information Management
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• v.21 no.3
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• pp.185-202
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• 2004

The electronic documents have the documental aspect that can legible by human and the electronic aspect that can be interpreted and processed automatically by machinery. This usability of electronic documents must be the reason that people use them in almost all the business areas rapidly in these days. That is because we have to utilize the characteristics to interchange electronic documents(EDI) effectively and efficiently. The electronic document interchange of Korean government cannot make the best of this benefit due to the traditional way of thinking based on paper document and the viewpoint of individual business, organization. and project. This paper proposed a direction of ED! for Korean government. At first. the concept of electronic docuemnts is defined. The reason and limitations of structuring the documents with XML and the hidden problems of present ED! in Korean public sector are also explained. And the way to preserve information, to design the structure of electronic document. and to maintain relevant standards is proposed.

• Journal of the Korean Society of Surveying, Geodesy, Photogrammetry and Cartography
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• v.26 no.5
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• pp.537-546
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• 2008

The digital map has been updated in every five years in the past. However, it has been changed to make corrections and updated in every two years for metropolitan region and every four years for other regions since year 2008. Although, the correctness and reliability were decreased and updating work is being delayed due to the updating work in a lump. The period update spends a lot of money because this method uses aerial photogrammetry, and the digital map has the time gap between periods. Therefore, this study provides information necessary for digital map produced by the government and develops digital map production system based on objects which can be updated frequently in order to save state and local government budgets that double investment are generated to update digital map. In order to analyze usefulness of the developed system, subject area was selected and errors of updated data were analyzed. As the result of analysis, checked 66 errors were corrected and saved in the database.