• Title/Summary/Keyword: 동적 재배치

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Timing Constrained Spatial Query Processing for Real-time Spatial Database System (실시간 공간데이터베이스 시스템에서의 시간제약조건을 갖는 공간질의 처리)

  • 임정옥;조숙경;김경배;이순조;배해영
    • Proceedings of the Korean Information Science Society Conference
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    • 1999.10a
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    • pp.278-280
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    • 1999
  • 실시간 GIS 응용 프로그램에서는 기존의 GIS 시스템과는 달리 동적인 공간데이터가 신뢰성을 위해 일정한 시간 내에 갱신되어야 유효성을 유지하며, 사용자가 요청하는 질의는 일정 시간 내에 처리되어야 하는 시간제약조건을 갖는다. 이러한 GIS응용프로그램을 지원하기 위한 실시간 공간데이터베이스 시스템에서는 기존의 실시간 데이터베이스 시스템에서 고려되지 않은 동적 실시간 공간데이터와 실시간 공간질의에 대한 처리가 필요하며 질의 처리 시 실시간 데이터와 실시간트랜잭션의 시간제약조건의 만족을 초대화하기 위한 고려가 필요하다. 본 논문에서는 실시간 공간질의 처리 시 예측성을 최대화 하기 위해 질의에서 빈번히 사용되는 데이터를 주기억상주 데이터베이스에 저장하였고, 실시간 공간데이터의 관리를 위하여 공간질의어를 확장하였다. 또한 실시간 공간질의 처리 시에 실시간 데이터와 실시간트랜잭션의 시간제약조건을 최대한 만족시키기 위해 공간질의 분석과 연산 순서의 재배치 기법을 사용하였다.

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Dynamic Arrangement of Control in a Personalized Learning Environment (개인화 학습 공간을 위한 동적 컨트롤 배치 기법)

  • Han, Sung-Jae;Lee, Young-Seok;Cho, Jung-Won;Choi, Byung-Uk
    • Journal of KIISE:Computing Practices and Letters
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    • v.14 no.1
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    • pp.106-110
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    • 2008
  • The requirement for customized learning environments is increasing with the development of Web 2.0 technology To personalize services in E-learning, there are various functions available to the user. However, some components have fixed or inflexible functionality that limits what can be changed, and customization information has not been used for other purposes. In this paper, we propose an e-Space manager for the dynamic customization of learning environment control units. The proposed method can confirm which areas users have customized and how they have customized them. The advantage is that users can control their own learning environments, including not only the format, but also the content within the limits of the underlying system. The customization information is captured to confirm the competency model.

An Efficient Update Algorithm for Packet Classification With TCAM (TCAM을 이용한 패킷 분류를 위한 효율적인 갱신 알고리즘)

  • Jeong Haejin;Song Ilseop;Lee Yookyoung;Kwon Taeckgeun
    • The Journal of Korean Institute of Communications and Information Sciences
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    • v.31 no.2A
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    • pp.79-85
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    • 2006
  • Generally, it is essential that high-speed routers, switches, and network security appliances should have an efficient packet classification scheme in order to achieve the high-speed packet forwarding capability. For the multi-gigabit packet-processing network equipment the high-speed content search hardware such as TCAM and search engine is recently used to support the content-based packet inspection. During the packet classification process, hundreds and thousands of rules are applied to provide the network security policies regarding traffic screening, traffic monitoring, and traffic shaping. In addition, these rules could be dynamically changed during operations of systems if anomaly traffic patterns would vary. Particularly, in the high-speed network, an efficient algorithm that updates and reorganizes the packet classification rules is critical so as not to degrade the performance of the network device. In this paper, we have proposed an efficient update algorithm using a partial-ordering that can relocate the dynamically changing rules at the TCAM. Experimental results should that our algorithm does not need to relocate existing rules feature until 70$\%$ of TCAM utilization.

An Intelligent Reservation Algorithm for Workload Distribution (부하 분산을 위한 지능형 예약 알고리즘)

  • Lee Jun-Yeon
    • Journal of the Korea Institute of Information and Communication Engineering
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    • v.9 no.5
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    • pp.1142-1148
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    • 2005
  • We proposes an algorithm of measuring computation loads to distribute workload of clients. The key of the algorithm is to transfer a suitable amount of processing demand from senders to receivers in relocating intrinsically. This amount is determined dynamically during sender-receiver negotiations. Factors considered when this amount is determined include processing speeds of different nodes, the current load state of both sender and receiver, and the processing demands of tasks eligible for relocation. We also propose a load state measurement scheme which is designed particularly for heterogeneous systems. Based on this analysis, we design new algorithm for supporting heterogeneous distributed web server system, and compare their performance against other existing algorithms. We show that the new algorithm improve the performance of CPU utilization and response time.

Dynamic Block Reassignment for Load Balancing of Block Centric Graph Processing Systems (블록 중심 그래프 처리 시스템의 부하 분산을 위한 동적 블록 재배치 기법)

  • Kim, Yewon;Bae, Minho;Oh, Sangyoon
    • KIPS Transactions on Software and Data Engineering
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    • v.7 no.5
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    • pp.177-188
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    • 2018
  • The scale of graph data has been increased rapidly because of the growth of mobile Internet applications and the proliferation of social network services. This brings upon the imminent necessity of efficient distributed and parallel graph processing approach since the size of these large-scale graphs are easily over a capacity of a single machine. Currently, there are two popular parallel graph processing approaches, vertex-centric graph processing and block centric processing. While a vertex-centric graph processing approach can easily be applied to the parallel processing system, a block-centric graph processing approach is proposed to compensate the drawbacks of the vertex-centric approach. In these systems, the initial quality of graph partition affects to the overall performance significantly. However, it is a very difficult problem to divide the graph into optimal states at the initial phase. Thus, several dynamic load balancing techniques have been studied that suggest the progressive partitioning during the graph processing time. In this paper, we present a load balancing algorithms for the block-centric graph processing approach where most of dynamic load balancing techniques are focused on vertex-centric systems. Our proposed algorithm focus on an improvement of the graph partition quality by dynamically reassigning blocks in runtime, and suggests block split strategy for escaping local optimum solution.

In Relation to Entrepreneurial Orientation, Dynamic Capability and Export Performance of International New Ventures, the Moderating Effect of External Trade Environment (국제신벤처기업의 기업가지향성, 동적역량, 수출성과 관계와 외부 통상환경의 조절효과)

  • Cho, Yeon-Sung
    • International Commerce and Information Review
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    • v.15 no.3
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    • pp.3-24
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    • 2013
  • This study has examined the relationship between entrepreneurial orientation(EO), dynamic capability(DC) and export performance of international new ventures(INVs). Also, the moderating effect of external environment factors(the hostility at domestic markets and the industrial dynamics) were analysed. Empirical analysis was performed on 101 INVs. It was conducted using the PLS(Partial Least Square). The result of empirical analysis showed that there is a positive relationship between EO, DC and export performance. The result of moderating effect showed that two external environment factors have positive moderating effect on the relationship between EO and DC. However, there was not moderating effect of external environment factors on the relationship between DC and export performance.

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FPGA/GPU-based Autostereoscopic 3D Video Generation System (FPGA/GPU 기반 다시점 영상 생성 시스템)

  • Shin, Hong-Chang;Um, Gi-Mun;Kim, Chan;Cheong, Won-Sik;Hur, Namho
    • Proceedings of the Korean Society of Broadcast Engineers Conference
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    • 2012.11a
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    • pp.220-223
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    • 2012
  • 본 논문에서는 스테레오 영상으로부터 무안경 3D 디스플레이를 위한 다시점 영상을 생성하는 시스템을 제안한다. 제안한 시스템에서는 먼저 비디오 캡쳐 카드를 통해 입력되는 스테레오 영상으로부터 FPGA 상에서 구현된 Trellis 동적 프로그래밍 기법에 의해 좌우 변이 영상을 실시간으로 추출한다. 이 변이 영상을 기반으로 좌우 영상 사이에서 중간 시점 영상을 생성한다. 이렇게 추출된 좌우 변이 영상과 좌우 스테레오 영상은 각각 USB 3.0 과 PCI-express 인터페이스를 통해 GPU 로 전송되고, GPU 에서는 이들 데이터를 사용하여 변이 기반 영상 합성 방법을 통해 다시점 영상을 생성한다. 생성된 다시점 영상은 다시점 3 차원 디스플레이 규격에 맞게 재배치되어 재생된다.

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Fixed Partitioning Methods for Extending lifetime of sensor node for Wireless Sensor Networks (WSN환경에서 센서노드의 생명주기 연장을 위한 고정 분할 기법)

  • Han, Chang-Su;Cho, Young-Bok;Woo, Sung-Hee;Lee, Sang-Ho
    • Journal of the Korea Institute of Information and Communication Engineering
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    • v.20 no.5
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    • pp.942-948
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    • 2016
  • WSN based on wireless sensor nodes, Sensor nodes can not be reassigned and recharged if they once placed. Each sensor node comes into being involved to a communication network with its limited energy. But the existing proposed clustering techniques, being applied to WSN environment with irregular dispersion of sensor nodes, have the network reliability issues which bring about a communication interruption with the local node feature of unbalanced distribution in WSN. Therefore, the communications participation of the sensor nodes in the suggested algorithm is extended by 25% as the sensor field divided in the light of the non-uniformed distribution of sensor nodes and a static or a dynamic clustering algorithm adopted according to its partition of sensor node density in WSN. And the entire network life cycle was extended by 14% to ensure the reliability of the network.

Assignment and Operation Sequencing for Remarshalling of a Vertical Yard Block in Automated Container Terminals (자동화 컨테이너 터미널에서 수직형 블록의 이적작업을 위한 할당 및 작업순서)

  • Bae Jong-Wook;Park Young-Man;Kim Kap-Hwan
    • Journal of Navigation and Port Research
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    • v.30 no.6 s.112
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    • pp.457-464
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    • 2006
  • Remarshalling operation is one of the operations considered important in an automated container terminal to perform quickly loading operations and delivery operations. It arranges the containers scattered at a verticla yard block in order to reduce the transfer time and the rehandling time of ATC(Automated Transfer Crane)s. This paper deals with the remarshalling planning problem minimizing the weighted operation time. This problem can be decomposed into 2 subproblems, storage space assignment problem and operation sequencing problem Storage space assignment problem decides to where containers are transported in terms of transportation time cost.. With results of a previous subproblem, operation sequence problem determines the ATC operation sequence, which minimizes the dead-heading of ATC This study formulates each subproblem with mixed integer program and dynamic program. To illustrate the proposed model, we propose an instance to explain the process of remarshalling planning.

Numerical Simulation of Impact and Dynamic Deformation Based on Two-Step Eulerian Method (Two-Step Eulerian 기법 기반 충돌 및 동적 변형 해석)

  • 백승훈;이민형;김승조
    • Journal of the Korean Society for Aeronautical & Space Sciences
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    • v.34 no.8
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    • pp.47-54
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    • 2006
  • In this paper, numerical algorithms applied in two-step eulerian scheme are investigated and implemented. Element quantities are advected with donor or van Leer algorithm. Nodal quantities are advected with Simplifed ALE [SALE] algorithm. Material interfaces are determined with Simple Line Interface Calculation [SLIC] algorithm. Practical aspects considered for code development are addressed in detail. The results of developed two-step Eulerian code are verified by comparing with those from pure lagrangian scheme and commercial code.