• Title/Summary/Keyword: Synchronization Network

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Design of Synchronization and T-STD Model for 3DTV Service over Hybrid Networks

  • Yun, Kugjin;Cheong, Won-Sik;Lee, Gwangsoon;Li, Xiaorui;Kim, Kyuheon
    • ETRI Journal
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    • v.38 no.5
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    • pp.838-846
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    • 2016
  • The objective of digital broadcasting has evolved from providing a plain video service to offering a realistic visual experience. Technologies such as 3DTV and UHDTV have been suggested to achieve this new objective by providing an immersive and stereoscopic visual experience. However, owing to the high bandwidth requirements of such services, the broadcasting industry has faced a challenge to find a new transport mechanism for overcoming the bandwidth limitation. The standardization organizations, the Advanced Television Systems Committee, Digital Video Broadcasting, and Telecommunications Technology Association, have been working on the integration of broadcasting and a broadband network (IP) to resolve the bandwidth issue of realistic video services. This paper introduces a frame-level timeline synchronization and transport system target decoder model for providing a stable 3DTV service over a hybrid network. The experimental results indicate that the proposed technologies can be successfully adopted as a reference model in a broadcast-broadband hybrid 3DTV service and other IP-associated hybrid broadcasting services.

A Navigation Method Based on the NDGPS and LORAN-C (NDGPS와 LORAN-C 기반의 항법 방안 연구)

  • Shin, Mi-Young;Park, Chan-Sik;Lee, Chang-Bok;Suh, Sang-Hyun;Lee, Sang-Jeong
    • Journal of Institute of Control, Robotics and Systems
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    • v.12 no.9
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    • pp.891-897
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    • 2006
  • The coverage of the NDGPS is nationwide currently and by 2007 more than 2 NDGPS signal will be available in most of Korean peninsula both coastal area and inland. The role of NDGPS beacon is transmitting pseudorange corrections however if range or pseudorange can be measured from NDGPS beacon signal, it might be possible to construct an independent regional navigation system: The range from NDGPS beacon signal can be used as additional measurements to remove GPS shadow area and to improve accuracy and reliability of GPS. Furthermore, by adding Loran-C, a regional radio navigation system without GPS can be possible. In this paper, a feasibility study on the regional positioning system using NDGPS and LORAN-C are given. The results show that the NDGPS and LORAN-C can be used as a ground based regional navigation system if requirements such as synchronization of NDGPS network, dual coverage of NDGPS, navigation algorithm for both NDGPS and LORAN-C measurements and an efficient ASF compensation method are met.

Digital voice data security techniques with secret key distribution function applicable to military communication (군 통신에 적용 가능한 비밀 키 분배 기능을 갖는 디지털 음성 데이터 보안 기법)

  • Im Sung Yeal
    • Convergence Security Journal
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    • v.21 no.4
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    • pp.15-22
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    • 2021
  • Security of voice communication content in the military's voice communication network will be essential. There is no proposed study on voice data security of military communication networks, but security of voice data will be essential when communicating. This paper is about to an encryption/decryption technique of digital voice data to provide security in case of voice calls in a military communication network. In addition, by using a symmetric key algorithm using AES, a secret key is required, and it has the function of transmitting this key to the receiving end before setting it as a voice call, solving the difficulty of distributing the secret key. This paper proposes a security technique for digital voice data that applies a synchronous stream encryption method that is relatively easy to restore synchronization even in the event of loss of synchronization among stream encryption techniques.

A Literature Review of the Effectiveness Measurement for NCW (NCW 효과측정에 관한 문헌조사 연구)

  • Jung, Chi-Young;Lee, Jae-Yeong
    • Journal of the Korean Operations Research and Management Science Society
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    • v.37 no.2
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    • pp.1-16
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    • 2012
  • NCW(Network Centric Warfare) offers BSEs(Battelspace-Entities) the capabilities of sharing information through C4ISRCommand, Control, Communications, Computers and Intelligence, Surveillance and Reconnaissance) network and it also improves their combat powers based on information superiority with awareness of common situation in battlefield and self-synchronization. Although the concept of NCW was developed at the end of 1990 and there have been various studies for NCW from the development of its concept, the effort for measuring the synergistic effect of NCW is insufficient at the present time. Therefore, in this paper we reviewed literatures concerning the effectiveness measurement of NCW. The category of our survey is network effect, metrics, simulation, battlefield information, social network analysis and mathematical model. The main purpose of this study is to suggest future researchers a research direction by analyzing the aspects and limitations of existing studies about the quantitative measurement of NCW.

Design of Network Protocol based on P2P Collaboration and User's Content Using Information (P2P 협업 및 사용자 콘텐츠 이용 정보 기반의 네트워크 프로토콜 설계)

  • Nahm, Eui-Seok
    • The Transactions of The Korean Institute of Electrical Engineers
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    • v.66 no.3
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    • pp.575-580
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    • 2017
  • In these days, the big-size and high resolution multimedia file is widely used through networks. To transfer and service effectively, the internet network technology is necessary to substitute broadcasting. Normally Content Delivery Network(CDN) is widely used in conventional internet for multimedia services. But it has a small bandwidth to service. So to solve this problems, many researchers have suggest the protocol for download, content distribution/saving, server synchronization, caching, pushing rate, and streaming etc. But all of these has some defects like low resolution, packets loss and delay, real application implementations etc. So, this paper suggests a new method of network protocol based on P2P collaboration and user's content using information. And it evaluated the performance of suggested method. As the results, it showed the effectiveness of 4 performances indices : download speed, decreasing rate of connected user in same time, adaptive hit ratio, traffic decreasing rate.

A study on the data integrated Model in RFID network (RFID 네트워크에서 정보 통합 모델 연구)

  • Lee, Chang-Yeol
    • Journal of the Korean Institute of Intelligent Systems
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    • v.16 no.6
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    • pp.785-790
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    • 2006
  • In RFID-based SCM, The traceability and product information is the important target data. In this paper, efficient items traceability model and the integrated model of the product between RFID network and GDS(Global Data Synchronization) network are studied. Information consists of the dynamic data generated from RFID network and static data generated from GDS Network. The integrated model will provide the interoperability between 2 kinds of networks.

The Development of Protocol for Construction of Smart Factory (스마트 팩토리 구축을 위한 프로토콜 개발)

  • Lee, Yong-Min;Lee, Won-Bog;Lee, Seung-Ho
    • Journal of IKEEE
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    • v.23 no.3
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    • pp.1096-1099
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    • 2019
  • In this paper, we propose the protocol for construction of smart factory. The proposed protocol for construction of smart factory consists of an OPC UA Server/Client, a technology of TSN realtime communication, a NTP & PTP time synchronization protocol, a FieldBus protocol and conversion module, a technology of saving data for data transmit latency and synchronization protocol. OPC UA server/client is a system integration protocol which makes interface industrial hardware device and supports standardization which allows in all around area and also in not independent from any platform. A technology of TSN realtime communication provides an high sensitive time management and control technology in a way of sharing specific time between devices in the field of high speed network. NTP & PTP time synchronization protocol supports IEEE1588 standardization. A fieldbus protocol and conversion module provide an extendable connectivity by converting industrial protocol to OPC. A technology of saving data for data transmit latency and synchronization protocol provide a resolution function for a loss and latency of data. Results from testing agencies to assess the performance of proposed protocol for construction of smart factory, response time was 0.1367ms, synchronization time was 0.404ms, quantity of concurrent access was 100ea, quantity of interacting protocol was 5ea, data saving and synchronization was 1,000 nodes. It produced the same result as the world's highest level.

A Mechanism to Support Real-Time Internet Services over the ATM Network (ATM 망을 통한 실시간 인터넷 서비스 지원 메커니즘)

  • 금정현;정광수
    • The Journal of Korean Institute of Communications and Information Sciences
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    • v.24 no.6B
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    • pp.1113-1122
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    • 1999
  • In this paper, we propose MSS(Multicast Synchronization Server) and QCS(QoS Conversion Server) models that can support IP multicast and QoS(Quality of Service) over the ATM network more efficiently. In the MSS model, it is possible to establish shortcut VCs(Virtual Circuits) among all hosts in the ATM network and to transfer multicast data at high speed. Also the MSS model is more scalable, because the number of inter-cluster VCs needed in the MSS model is less than that of EARTH. In the QCS model, ATM switch is modified to support one QoS service and best effort service through the one point-to-multipoint VC at the same time so required network resources are reduced, and dedicated server is used for QoS conversion to accept heterogeneous receivers more efficiently. In this Paper, the proposed MSS model and QCS model have solved both efficiency problem and scalability problem. It is proved through the comparison of the VCs required in each model.

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A Method of the Grandmaster Selection and the Time Synchronization Using Single TimeSync Frame for Audio/Video Bridging (동기식 이더넷에서 단일 타임싱크 프레임을 이용한 그랜드마스터 결정 및 시간 동기 방법)

  • Kang, Sung-Hwan;Lee, Jung-Won;Kim, Min-Jun;Eom, Jong-Hoon;Kwon, Yong-Sik;Kim, Sung-Ho
    • Journal of KIISE:Information Networking
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    • v.35 no.2
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    • pp.112-119
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    • 2008
  • Today, A matter of concern of home network technology increase. The standard of communication between home network devices are required. IEEE 802.1 AVB(Audio/Video Bridging) specifies transmission method for time-sensitive data between these devices using Ethernet in bridged local area networks. IEEE 802.1 AVB and IEEE 1588 PTP(Precision Time Protocol) have various message type for grandmaster selection and synchronize the devices. These messages bring on complexity protocol. We propose a method that uses Single TimeSync frame in order to the problem. Our proposal is appropriate process complexity and low transmission delay for home network by using the TimeSync frame. Furthermore, after all devices are adjusted to the single TimeSync frame, a resource reservation, a forwarding and queueing rule are needed for a time-sensitive application.

Synchronization Method of Stereoscopic Video in 3D Mobile Broadcasting through Heterogeneous Network (이종망을 통한 3D 모바일 방송에서의 스테레오스코픽 비디오 전송을 위한 동기화 방법)

  • Kwon, Ki-Deok;Yoo, Young-Hwan;Jeong, Hyeon-Jun;Lee, Gwang-Soon;Cheong, Won-Sik;Hur, Nam-Ho
    • Journal of Broadcast Engineering
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    • v.17 no.4
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    • pp.596-610
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    • 2012
  • This paper proposes a method to provide the high quality 3D broadcasting service in a mobile broadcasting system. In this method, audio and video data are delivered through a heterogeneous network, consisting of a mobile network as well as a broadcasting network, due to the limited bandwidth of the broadcasting system. However, it is more difficult to synchronize the left and right video frames of a 3D stereoscopic service, which come through different types of networks. The proposed method suggests the use of the offset from the initial timestamp of RTP (Real Time Protocol) to determine the order of frames and to find the pair of a left and a right frame that must be played at the same time. Additionally, a new signaling method is introduced for a mobile device to request a 3D service and to get the initial RTP timestamp.