• Annual Conference of KIPS
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• 2009.04a
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• pp.148-151
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• 2009

u-GIS 공간정보를 제공하기 위한 3D 모델의 렌더링 성능을 향상시키기 위해 일반적으로 Discrete LOD 기법이 적용된다. 하지만 u-GIS의 3D 건물 모델은 그 복잡성이 매우 높아 LOD 단계별로 모델을 직접 생성하려면 많은 비용과 시간이 소요되어 효율적이지 못하다. 본 연구에서는 원본 3D 모델을 활용하여 하위 LOD 단계의 모델을 메쉬 간략화 알고리즘인 QEM 기법을 통해 생성하는 프로그램을 구현하였다. 프로그램은 다양한 3D 모델의 데이터 포맷을 입력받고 출력할 수 있도록 하여 범용성을 높이고, 생성되는 모델의 결과를 바로 화면으로 확인할 수 있도록 하여 사용자 편의성을 확보하였다. 몇 개의 실제 3D 건물 모델로 실험을 수행하여 프로그램의 성능을 검증하고 그 결과를 도출하였다.

• Journal of Nuclear Fuel Cycle and Waste Technology(JNFCWT)
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• v.7 no.4
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• pp.219-227
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• 2009

The effect of organic acids on the adsorption of U(VI) onto oxide surfaces ($TiO_2)$(anatase), $SiO_2$(amorphous) and $Al_2O_3$(amorphous)) has been investigated. Two different organic acids, salicylic and picolinic acids, were used. Changes of adsorption ratio of U(VI), which depend on the existence of organic acids in a sample, were measured as a function of pH. Quantities of adsorbed organic acids, which depend on the existence of U(VI) in a sample, were also measured as a function of pH. It is confirmed that the soluble complex formation of U(VI) with organic acids can deteriorate the adsorption of U(VI) onto $TiO_2$ surface. It is noteworthy that salicylic acid does not affect the adsorption of U(VI) onto $SiO_2$ surface, however, picolinic acid enhances the adsorption of U(VI) onto $SiO_2$ surface. The latter effect can be understood by considering the formation of a ternary surface complex on $SiO_2$ surface, which was confirmed by the co-adsorption of picolinic acid with U(VI) and the change in a fluorescence spectra of U(VI) on surface, In the case of $Al_2O_3$, organic acids themselves were largely adsorbed onto a surface without deteriorating the adsorption of U(VI). This would support the possibility of a ternary surface complex formation on the $Al_2O_3$ surface, and an additional spectroscopic study is required.

• The Korean Journal of Air & Space Law and Policy
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• v.1
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• pp.125-146
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• 1989

This paper is examine the problems of U.S.-Korea Air Service Agreement and recommend some directions for its improvement under the rapidly changing circumstance and growing importance of Korean penisula. Since the provisional agreement of 1949, U.S. -Korea Air Service Agreement has consistently been favorable to U.S. side. Fair and equal opportunity is the principle and basis of the bilateral air agreement. Notwithstanding such principle, it is only the U.S. carriers who can freely enter into any market, under the discretion of business strategy, while Korean carrier can serve only three points including Honolulu. In an effort to recitify such serious imbalance, Korea continuousely requested additional rights and has given utmost efforts to accommodate requests made by U.S. carries without much success. When we review aviation market between Korea and U.S. under the present agreement, Korea is fully open to U.S. carries as they can connect from any or all points in the U.S. via any or all points in Korea and all points beyond Korea. Increased number of U.S. carriers are enjoying greater utilization of the opportunity accorded them. Four(4) U.S. carries now operate to Korea using thirteen(13) gateway points and about one hundred fifty(150) on-line points in the U.S. such imbalance can be well understood when we review the exchange of traffic rights between the U.S. and the Pacific rim countries. During the yeras following the 1978 agreement with Korea, the U.S. proceeded to sign liberal agreements with Thailand, Taiwan, Singapore and the Phillipines. In exchange, the U.S. granted the four Pacific rim countries substantially greater rights than were granted to Korea, although Korea was the first Asian nation to sign a pro-competitive aviation agreement which granted U.S. carriers unrestricted market access and pricing flexibility. Moreover, Korea ranks the 2nd trading and tourist partner to the U.S. among the Pacific rim countries (Japan is the largest partner to the U.S. in terms of both trade and tourist market). In this paper such problems in the Korea-U.S. Air Services Agreement are analyzed in terms of historical perspective, U.S. Aviation policy, imbalance status in detail cases, discrimination to Korea comparing to other Asian countries, and theoretical application. And further it discusses current aviation issues between Korea and U.S. such as the ratification of 1980 MOU and various doing business issues of U.S. carriers in Korea. Finally, this paper concludes the analysis and suggests some directions to improve and rectify the problems and imbalance of U.S.-Korea Air Services Agreement in question.

• The Korean Society of Law and Medicine
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• v.7 no.2
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• pp.137-178
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• 2006

The purpose of this paper is to analyse the present situation and legal problems of u-health. U-health plays an important role in enlarging the healthcare service and making the healthcare service efficient. The use of Korean excellent IT technology can lead us to a world wide competitive healthcare industry. Although u-health has the weakness in privacy protection, the usefulness and convenience of u-health is great. Therefore we must analyse the legal issues of security technology, RFID, telemedicine and EMR pertaining to u-health and construct the appropriate legislative structure to resolve the legal problems of u-health.

• Journal of Korean Society of Industrial and Systems Engineering
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• v.33 no.4
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• pp.10-22
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• 2010

The first full-scale u-City operation has started in Dongtan u-City. As local cities take over and operate the u-City, unexpected issues arise such as securing the budget of operating costs and self-providing the costs with business models utilizing the u-City assets. The paper presents a strategy for solving these issues. The strategy provides a foundation(infrastructure) for long-term operation models which may reduce the long-term operating costs. In order to establish the economic operating framework of u-City, suggested are some cost-reduction models based on the operating costs structure. For each model, a base framework with comparative analysis of operating costs is provided. With these models, each u-City may select a relevant model according to the characteristics of it. We hope that the framework provides the foundation for efficient and sustainable u-City operations.

• The Journal of Korea Institute of Information, Electronics, and Communication Technology
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• v.7 no.1
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• pp.45-49
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• 2014

In this paper, we propose a secure and efficient RFID-based patient authentication protocol to not only authenticate patients' authenticity but also protect patients' personal medical informations for u-Healthcare environments. Since the proposed RFID-based patient authentication protocol provides strong security and efficiency, it can be used practically for patient authentication and personal medical information protection on the high technology medical environments such as u-Hospital and u-Healthcare.

• 한국IT서비스학회:학술대회논문집
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• 2009.05a
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• pp.121-121
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• 2009

u-City는 첨단 정보통신 인프라를 활용하여 유비쿼터스 서비스를 도시공간에 제공함으로써 도시민의 생활편의 증대와 삶의 질을 높이고 체계적인 도시관리 및 도시의 제반 기능의 혁신을 통해 도시 경쟁력 향상을 목표로 한다. 최근 u-City의 핵심부문으로, u-City의 성공적 구축을 위해 관심이 집중되고 있는 도시통합운영센터는 기존 도시에서는 시도해 보지 않았던 새로운 개념으로, U-City법에서 향후 U-서비스의 관리 운영에 필수적인 U-City기반시설로 규정되어 있기는 하지만 도시통합운영센터에 대한 명확한 기준이 없다. 또한 구축 관리 운영을 위해 필요한 법 제도적 기반환경이 미흡한 실정으로, 법적 근거없이 개별법에 의한 사업추진으로 실제로 도시통합운영센터를 구현하는데 많은 어려움을 겪고 있다. 이와 같이 u-City와 도시통합운영센터는 기존 도시에서는 시도해 보지 않았던 새로운 개념이기 때문에 현행 법에 맞지 않는 경우 발생하기 때문에 이에 적합한 새로운 법/제도가 필요하다. 본 연구는 기존 관련법과의 연계를 통한 도시통합운영센터 구축 운영에 대한 법 제도적 기반환경 마련을 위한 연구로서, u-City 관련 법/제도 중 도시통합운영센터 구축 및 운영 관련 사항에 대한 검토를 통해, 법/제도적 측면에서 도시통합운영센터 구현에 필요한 제반사항을 검토하였다. 구축측면 (계획/건설)에서 시스템 공동활용 및 연계 구축 방안 마련을 위해 도시통합운영센터 구축주체, 재원조달방법을 검토하였으며, 운영측면에서 도시통합운영센터 운영 방안을 마련하기 위해 도시통합운영센터의 공공기능 수행 및 운영에 대한 사항을 분석하였다. 도시통합운영센터 구축 운영에 대한 법 제도 정비를 위한 기반연구를 통해 도시통합운영센터의 성공적인 구축 및 운영을 도모하고자 한다.

• Journal of the Korean Society of Fisheries and Ocean Technology
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• v.19 no.1
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• pp.51-56
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• 1983

In the stability problem of the U-grooved plate, it has a circular hole, the site of the hole determines some different deformation mode when it was loaded. To determine the optimal position of the circular hole-center which not to get large distortion of the hole itself, in this paper, we studied the distributions of stresses in the neck area between hole and U-groove and the distortion mode of the deformed hole by B.E.M(Boundary Element Method) and compared with experimental results in four cases. For a distributed load, according to the center of the hole moves closer to the U-groove center (c.-c. line), the shape of the circular hole was transformed to the elliptical one(it's major axis perpendicular to the c.-c. line). In this problem, the results by Boundary Element Method was well accorded with Experiments.

• Fire Science and Engineering
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• v.24 no.1
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• pp.72-80
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• 2010

This study suggests ubiquitous railway disaster prevention system that gearing Ubiquitous Sensor Network system information take to the subway fire accident information which emergency response procedure as occurring subway fire accident scenario. Also it is proposed that emergency response system though fire scenario. collected Information was analyzed each system over providing information and it is designed to exchanging information structure though relation system. The ubiquitous railway disaster prevention system basically consists by four unit stages as prevention, preparedness, response and recovery system. Especially, in this system can supply real time accident information to the relevant government offices and public through forecasting and warning system by utilizing recognition of the five senses in case of accident. also, it is build that to make decisions as linking 2-dimension and 3-dimension space information interface of ubiquitous sensor networks and expected scenarios.

• Proceedings of the Korean Association of Geographic Inforamtion Studies Conference
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• 2008.10a
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• pp.289-292
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• 2008

본 연구에서는 u-City인력수급 전망을 토대로 국토해양부의 u-City 관련 인력양성에 대한 실천계획이 효율적으로 실행될 수 있는 방안을 제시하였다. u-City를 추진하는 지자체, 개발사업자마다 공통적으로 제기하는 문제점은 u-City 관련 고급 및 기능 인력의 절대적인 부족이다. 그러나 u-City 전문인력은 u-City건설의 특성상 도시계획 개발, 정보통신망, IT 등 다양한 분야에 대한 전문지식을 갖추어야하나 이러한 고급인력이 배출되고 있지 않다. 따라서 본 연구에서는 인력양성방안의 목표를 'u-City의 성공적인 추진에 부합하는 전문인력양성'으로 설정하였으며, 수요자 중심의 교육, 지역 균형적인 전문인력양성, u-City 관련 분야의 융 복합교육, u-City 관련 교육인프라 구축을 추진전략으로 수립하였다. u-City 인력양성의 추진목표 및 전략을 실행하기 위한 중점추진과제로는 'u-City건설 전문인력교육 관련 수요전망', '지역별 거점대학 선정을 통한 전문인력의 양성', 'u-City 인력양성센터 건립추진', '교육포탈을 통한 온라인 교육', '교육인프라 구축' 등 5개를 선정하였다. u-City 인력양성을 위한 추진전략의 성공적 실행을 위해서는 중점 추진과제들간의 유기적인 연계가 필수적이다.