• Title, Summary, Keyword: 비실시간

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A Wireless Downlink Packet Scheduling Algorithm for Multimedia Traffic (멀티미디어 트래픽에 대한 무선 환경에서의 순방향 패킷 스케줄링 알고리즘)

  • 김동회;류병한
    • Journal of the Institute of Electronics Engineers of Korea TC
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    • v.39 no.12
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    • pp.539-546
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    • 2002
  • In this paper, we consider a wireless multimedia environment to service both real-time video traffic and non-real-time WWW-application traffic In our suggested new packet scheduling algorithm, we consider both the accumulation counter and SIR to reduce delay in real-time traffic. In addition, our packet scheduling algorithm gives priority first to real-time video traffic service and then to non-real-time internet Packet service when real-time traffic service is absent. From the simulation results, we find that the AC (Accumulation Counter) scheme has much smaller delay than the conversional M-LWDF scheme for real-time video data users, which has a special quality sensitive to its own delay. We also consider the transmission structure of using both the frame period in the time-axis and the OVSF codes in the code-axis at the same time, which is similar to the structure of HSDPA system.

Design and Implementation of a Hybrid Equipment Data Acquisition System(HEDAS) for Equipment Engineering System(EES) Framework (EES 프레임워크를 위한 하이브리드 생산설비 데이터 습득 시스템(HEDAS)의 설계 및 구현)

  • Kim, Gyoung-Bae
    • Journal of the Korea Society of Computer and Information
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    • v.17 no.2
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    • pp.167-176
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    • 2012
  • In this paper we design and implement a new Hybrid Equipment Data Acquisition System (HEDAS) for data collection of semiconductor and optoelectronic manufacturing equipments in the equipment engineering system(EES) framework. The amount of the data collected from equipments have increased rapidly in equipment engineering system. The proposed HEDAS efficiently handles a large amount of real-time equipment data generated from EES framework. It also can support the real-time ESS applications as well as non real-time ESS applications. For the real-time EES applications, it performs high-speed real-time processing that uses continuous query and filtering techniques based on memory buffers. The HEDAS can optionally store non real-time equipment data using a HEDAS-based database or a traditional DBMS-based database. In particular, The proposed HEDAS offers the compression indexing based on the timestamp of data and query processing technique saving the cost of disks storage against extremely increasing equipment data. The HEDAS is efficient system to collect huge real-time and non real-time equipment data and transmit the collected equipment data to several EES applications in EES framework.

분산제어 및 자동화시스템과 필드버스

  • 홍승호;김기암;김지용;고성준
    • ICROS
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    • v.2 no.4
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    • pp.19-29
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    • 1996
  • 본 고에서는 분산제어 및 자동화 시스템에서 필드버스 기술의 필요성과 현황 및 앞으로의 전망에 대하여 기술하였다. 또한, 필드버스에 접속되는 장비들에서 생성되는 데이터들은 크게 주기적, 실시간 및 비실시간 데이터 트래픽의 세가지로 나눌 수 있으며, 필드버스 네트워크의 제한된 대역폭이 이러한 데이터 트래픽을 수용하는 경우에 실시간 및 주기적 데이터의 전송지연시간에 대한 요구사항을 만족시키는 동시에 네트워크 설계기법을 소개하였다.

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A Study on Scheduling of Distributed Log Analysis by the importance of the measure (중요도에 따른 분산 로그분석 스케줄링)

  • Back, BongHyun;Ahn, Byoungchul
    • Proceedings of the Korea Information Processing Society Conference
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    • pp.1511-1514
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    • 2009
  • 이기종(異機種) 시스템환경에서 발생하는 수많은 로그 데이터는 중요도에 따라 실시간 로그 분석이 필요하고 대용량의 로그 데이터의 경우 특정 시간내에 로그 분석 처리를 종료해야만 한다. 보안에 관련된 로그 정보의 경우 실시간 분석과 빠른 통계 처리를 요구할 것이며, 대용량의 비실시간성 로그 분석의 경우 로그 분석 및 통계처리를 주어진 특정 시간 내에 하여야 한다. 본 논문에서는 로그 데이터의 중요도에 따른 실시간 로그 분석 처리와 비실시간 대용량 통계 로그의 로그 분석 처리 마감 시간을 충족하는 로그 분석 스케줄링 정책을 제안한다.

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A Two-step Disk Scheduling Scheme for Deadline Guarantee of Multimedia on Demand Server (주문형 멀티미디어 서버의 마감시간보장을 위한 2단계 디스크 스케줄링 기법)

  • 김정원;전봉기;윤홍원
    • Journal of the Korea Institute of Information and Communication Engineering
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    • v.8 no.1
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    • pp.88-95
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    • 2004
  • The previous disk scheduling schemes for best-effort applications do not guarantee the real-time requirement of multimedia objects and the real-time disk scheduling schemes do not satisfy throughput of multimedia server. So, this paper propose a two-step disk scheduling scheme to satisfy the requirement of best-effort as well as soft real-time applications. This scheme is based on the round robin algorithm that imposes different weights on the best-effort task and the real-time one. The experiment results on the Linux kernel have shown that both best-effort tasks and real-time tasks could get fair service.

A Study on Development and Validation of DIP to Application of Aircraft Database in Rea- Time Simulator Environment (실시간 시뮬레이터 환경에서 항공기 데이터베이스 적용을 위한 DIP 개발 및 검증에 관한 연구)

  • Kang, Im-Ju;Kim, Chong-Sup;Lee, Gi-Beom;Ahn, Sung-Jun;Shin, Sun-Young;Cho, In-Je;Ahn, Jong-Min
    • Journal of the Korean Society for Aeronautical & Space Sciences
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    • v.36 no.8
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    • pp.807-815
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    • 2008
  • In this paper, design, development and evaluation of DIP(Database Interface Program) are presented. The main purpose of this study is to improve the simulation quality to get more realistic response of target system. The designed and developed major function is composed of flexible memory structure, efficient arithmetic database language and high speed interpolation/extrapolation algorithm. To evaluate the operation speed and accuracy of returned data, trim simulation is performed based on in-house software and, DIP is applied to existing real-time simulator such as engineering HQS(Handling Quality Simulator) to evaluate reliability and performance. The result of evlaution reveals that calculation speed and data accuracy are satisfied, and flight performance is satisfied in the real-time simulator environments.

Distributed Control Algorithms for QoS in Wireless Networks Using Wireless Token Ring Protocol (무선토큰링 프로토콜을 사용한 무선 네트워크에서 QoS를 지원하는 분산 제어 알고리즘)

  • 김성철
    • Journal of Korea Multimedia Society
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    • v.7 no.2
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    • pp.187-193
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    • 2004
  • Wireless networks play a very important role in communications today. For example, wireless networks today provide from the basic services like e-mail and FTP to the multimedia applications like Web service. It is obvious that QoS requirements to these diverse applications over wireless networks will continue as in wired networks. Much research has been done to develop QoS supporting algorithms on Internet. But due to the limited bandwidth and varying channel states of the wireless networks, it is difficult to support differentiated service over wireless networks. In this paper we propose the modified wireless token ring protocol supporting QoS to the real-time traffic service node over Internet environments in which non-real-time and real-time traffic service nodes coexist. In the proposed algorithm, the real-time traffic service node gets the priority to take token over the non-real-time traffic service node. So the proposed algorithm support quick transmission of the real-time traffic service node. And this advantage can be obtained with minor modification of the legacy wireless token ing protocol to support QoS. We also consider the lost token recovery mechanism.

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The Extended-Military Multimedia Systems Based on Real-Time Scheduling Scheme (실시간 스케줄링을 적용한 Extended-Military Multimedia Systems)

  • Park, Sang-Hyuk;Kim, Jai-Hoon;Han, Chang-Hee
    • Journal of the Institute of Electronics Engineers of Korea CI
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    • v.48 no.1
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    • pp.26-32
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    • 2011
  • It is very important for more effective military operation to share information required in recognizing a situation by monitoring battlefield. The recognition of situations is offered visually though multi-media systems such as a COP(Common Operation Picture), UAV etc. The operating method has rapidly changed into Network-Centric Warfare (NCW). As a result, the data that these Multimedia systems should control is increasing. Improved performance of Multimedia systems is required to deal with them. In this paper, we propose Extended-Military Multimedia System(E-MMS) applying the most excellent scheduling method in terms of meet-ratio in real time when Multimedia systems carry out assigned information in real time for monitoring as the method of improved performance. As a result of utility about proposed system, it is verified that realtime EDF(Earliest Deadline First) scheduling method is more improved up to 20% compared to non-realtime FCFS(First Come First Service) in terms of the deadline meet ratio.

Improvement of E-Learning Efficacy by Self-Assessment (자기평가 적용에 따른 원격교육의 학습효과 증진)

  • Jeon, Hye-Seong
    • The Journal of the Korea Contents Association
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    • v.11 no.2
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    • pp.487-494
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    • 2011
  • This paper is to investigate the efficacy of cyber education by self-assessment strategy. Self-assessment strategy contains self-monitoring function and self-control function. 202 students of online university attended and analyzed with frequency, correlation, t-test, Paired t-test. The major findings were as follows. The learners who experienced self-assessment in the initial stage of class had higher changes in social distance to the mentally disabled people positively than the learners who didn't experienced that. This self-assessment strategy can be assumed that it is effective strategy to improve e-learning efficacy and it will contribute to self-directed education for enhancement of on-line education.

A Study on the QoS of Real-Time Traffic in Bursty Queueing Scheme (버스트 큐잉 구조에서 실시간 트래픽 QoS에 관한 연구.)

  • Kim, Gwang-Joon;Jang, Hyok;Na, Sang-Dong;Bae, Chul-Soo
    • Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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    • pp.401-405
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    • 1999
  • 본 논문은 실시간성 서비스인 버스트 트래픽을 갖는 ATM(Asynchronous Transfer Mode)망에서 실시간 연결 수락 제어를 위한 종단간의 지연보장을 알고리즘을 이용하여 실시간 서비스 트래픽 서비스 품질의 성능에 대해 분석하였다. 셀 손실 확률은 QoS(Quality of Service)의 기준이 되므로 제안된 실시간 알고리즘은 일정한 버퍼 메모리 크기와 연결 요청에 대한 수락 여부 즉, 연결 수락 여부의 결정을 위한 하나의 큐잉 서비스를 필요로 한다. 이러한 트래픽 소스 각 타입에 대한 초과된 셀에 대한 셀 손실 확률은 트래픽 소스 타입 전체에 하나만 존재하더라도 요구를 충족시킬 수 없으므로, 본 논문에서 제안된 버스트 트래픽 특성에 따라 지연보장 알고리즘을 이용한 큐 서비스 방식은 기존의 종단간 지연 보장 알고리즘들에서 사용하던 씬 정렬을 이용하지 않고 몇 개의 FIFO 큐로 구성된 라운드로빈 큐를 이용하여 복잡성을 크게 감소시켰으며 실시간 서비스와 비실시간 서비스의 서비스방식을 효과적으로 결합하여 다양한 QoS를 보장해야 하는 ATM망에 효과적으로 적용할 수 있고 제안된 알고리즘에 산출되는 각각의 셀 손실 확률에 충분한 상한선을 제공하는 전형적인 매개변수를 사용하여 성능을 분석한다.

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