• 제목/요약/키워드: Converged

검색결과 1,058건 처리시간 0.022초

이종 단말 환경에서의 미디어 서비스 플랫폼 개발 (Development of Media Platform for the Multi-Device Converged Services)

  • 정기태;강민정;이승탁;정상국;김정일
    • 한국정보통신설비학회:학술대회논문집
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    • 한국정보통신설비학회 2007년도 학술대회
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    • pp.173-175
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    • 2007
  • So far, almost all IP media services are targeted to the specific devices, for example, IPTV services are mainly for TV, and social community services are mainly for PC etc.. This paper describes newly developed media service platform in which the high quality video services can be provided not only to the TV or PC but also to the PMP(Portable Media Player) and even to the mobile phone. The major technical issues of the service platform are synchronization of contents among the different devices and high quality TV grade video display in PMP device. We confirmed successful operation of multi-device converged services in the developed media platform. We also have a trial service plan in Gwangju city at the end of this year.

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침투시험에서의 콘크리트 표적크기 영향 분석 (Concrete Target Size Effect on Projectile Penetration)

  • 김석봉;유요한
    • 한국군사과학기술학회지
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    • 제18권2호
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    • pp.154-159
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    • 2015
  • This paper deals with the effect of concrete target size on penetration of projectiles. We investigated the penetration depth and residual velocity of projectiles using the 2-D axial symmetric model. Most analysis were conducted with 13 kg projectile (striking velocity: 456.4 m/s) and concrete target with compressive strength of 39 MPa. This paper provided penetration depth (or residual velocity) versus ratio D/d (target diameter, D and projectile diameter, d). When the bottom of concrete cylinder was constrained, penetration depth converged to limit depth more than the ratio D/d of 36. The residual velocity of projectile with thin concrete target were investigated. The residual velocity was converged to specific velocity more than the ratio D/d of 16.

광대역 융합 엑세스 가입자 망 설계를 위한 타부서치 알고리즘 개발 (Tabu Search Algorithm for designing broadband converged access networks)

  • 윤현정;이영호;김영진;조은성;이순석;박노익
    • 한국경영과학회:학술대회논문집
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    • 한국경영과학회 2006년도 추계학술대회
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    • pp.277-280
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    • 2006
  • This paper deals with a heuristic algorithm for solving a broadband converged access networks (BCAN) design problem. The problem is to minimize the total cost of switches and cables while satisfying demand and QoS constraints. We propose a Tabu Search (TS) algorithm for finding a good feasible solution within a reasonable time limit.

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유헬스케어 중심의 의료산업 융합현황 고찰 및 발전방안 연구 (A Study on Review and Consideration of Medical Industry Convergence Based on U-healthcare)

  • 이성훈;이동우
    • 디지털융복합연구
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    • 제11권6호
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    • pp.193-197
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    • 2013
  • 최근 융합 현상중에서 관심 분야중 하나는 건강과 밀접한 헬스케어 산업이다. 헬스케어 산업은 정보통신과 의료산업이 융합된 분야로서, 우리사회가 겪고 있는 고령화 인구의 증가등의 요인으로 관심을 모으고 있다. 이에 본 논문에서는 IT와 의료산업의 융복합 형태인 유비쿼터스 헬스케어 서비스에 대한 현황 및 문제점, 향후 발전 방향등에 대해 고찰하였다.

ARCA-An Adaptive Routing Protocol for Converged Ad-Hoc and Cellular Networks

  • Wu, Yumin;Yang, Kun;Chen, Hsiao-Hwa
    • Journal of Communications and Networks
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    • 제8권4호
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    • pp.422-431
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    • 2006
  • This paper proposes an adaptive routing protocol called ARCA for converged ad-hoc and cellular network (CACN). Due to the limitation of both bandwidth and transmission range in a cell, a mobile host (MH) may not be able to make a call during busy time. CACN offers a flexible traffic diversion mechanism that allows a MH to use the bandwidth in another cell to ease the congestion problem and increase the throughput in a cellular network. Based on the presentation of CACN's physical characteristics, the paper details the design issues and operation of the adaptive routing protocol for CACN (ARCA). Detailed numerical analysis is presented in terms of both route request rejection rate and routing overhead, which, along with the simulation results, have indicated the effectiveness and efficiency of the ARCA protocol.

Next-Generation Converged Networking in Korea: The Concept and Its R&D Activities

  • Kang, Kug-Chang;Park, No-Ik;Lee, Soon-Seok;Kim, Young-Sun;Jun, Kyung-Pyo
    • Journal of Communications and Networks
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    • 제8권4호
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    • pp.475-479
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    • 2006
  • In Korea, we witness vivid evidences of changing trend in communication that insist the emergence of new networking architecture. To accommodate the changing trend and to hold current strong position in global IT industry, Korea have launched broadband convergence network (BcN) initiative. BcN vision for Korea is to be the first in the world to realize converged network infrastructure and ubiquitous service environment. In this paper, we have introduced the concept and the vision of BcN with a viewpoint of a new paradigm to prepare future-proof communication environment. And then, we have disclosed BcN research and development (R&D) activities including R&D philosophy, R&D phases, and key technologies required. Also, we have discussed current development issues in three technology branches including service and control technology, unified transport technology, and next-generation access technology.

적응 유한시간 정착제어기의 파라메터 수렴에 관한 연구 (A study on the parameter convergence of adaptive deadbeat controller)

  • 유시영;김인행;이문수;정필채;이금원;김경기
    • 제어로봇시스템학회:학술대회논문집
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    • 제어로봇시스템학회 1992년도 한국자동제어학술회의논문집(국내학술편); KOEX, Seoul; 19-21 Oct. 1992
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    • pp.182-187
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    • 1992
  • This paper proposes a method by which the estimated values of the unknown parameters of system are converged to the true values in finite time using adaptive deadbeat controller. After those are converged to the true values, the deviation from these values do not virtually exist or, if any, extremely small. Also we apply this technique of deadbeat convergence to a system contaminated with white noise or colored noise. It is shown that the estimated parameters of those systems approach the true values in finite time even though the performance do not match perfectly with the system without noises.

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확장칼만필터를 이용한 수중운동체의 6자유도 운동을 위한 동유체력계수 추정에 관한 연구 (A study on the hydrodynamic coefficients estimation of the 6-DOF model of an underwater vehicle with EKF)

  • 전창완;박성택;이장규;이동권;최중락;양승윤
    • 제어로봇시스템학회:학술대회논문집
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    • 제어로봇시스템학회 1992년도 한국자동제어학술회의논문집(국내학술편); KOEX, Seoul; 19-21 Oct. 1992
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    • pp.766-771
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    • 1992
  • The hydrodynamic coefficients estimation problem is important to develop an underwater vehicle and design a controller for it. In this paper, an identification theory, the Extended Kalman Filter, is applied to this parameter estimation problem. In the case that a process noise is not used, all of the parameters are almost exactly converged to the true values respectively. When a process noise is used, all of the parameters are converged to the true values, too, although some parameter estimates are slightly biased. The comparisons of the two trajectories between those generated by the true parameters and those by the estimated parameters show that the parameter estimation problem is well-solved.

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Development and Verification of Technical Criteria for a U-Bridge

  • Kim, Kyoon-Tai;Kim, Chang-Han
    • 한국건축시공학회지
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    • 제10권5호
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    • pp.145-153
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    • 2010
  • With the recent acceleration in the adoption of IT in industries, converged Construction-IT has been drawing attention as a new market driver in the IT fusion industry. Despite the simultaneous implementation of U-Cities all over Korea in a manner suiting each city's own attributes, Technical Criteria to build an optimized IT-infrastructure have not yet been prepared. To solve this problem, a standard for U-City construction should be prepared. This research, therefore, draw sample contents in order to establish and verify the criteria for U-City construction. The findings are expected to be meaningful, in that they would serve as significant data for establishing the criteria for future U-City construction.

다중 격자 다중 차원법을 이용한 선접촉 또는 점접촉 탄성 유체 윤활 해석 (Analysis of Line and Circular Contact Elastohydrodynamic Lubrication with Multigrid Multilevel Method)

  • 장시열
    • 한국윤활학회:학술대회논문집
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    • 한국윤활학회 1999년도 제30회 추계학술대회
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    • pp.323-330
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    • 1999
  • The conventional analysis for the numerical computation of fluid film thickness with elastic deformation of contact region. is performed by Newton-Rephson method for its 18st convergence characteristics. However, both high load and relatively low sliding velocity frequently make it impossible for Newton-Rahpson method to get both converged and stable solutions. In particular, this method cannot provide converged Solution under the condition of high load above 1.0 GPa which frequently occurs in line contact of EHL problem. Multigird multi-level method for the solver of non-linear partial differential equation including solid deformation is preferred to Newton-Rshpson method for better convergence and stability and is applied to line contact EHL behavior in this study.

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