• Title/Summary/Keyword: multiple terminals

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Network-based Cooperative TV Program Production System

  • H.Sumiyoshi;Y.Mochizuki;S.Suzuki;Y.Ito;Y.Orihara;N.Yagi;Na, M.kamura;S.Shimoda
    • Proceedings of the Korean Society of Broadcast Engineers Conference
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    • 1997.06a
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    • pp.75-81
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    • 1997
  • A new DTPP (Desk-Top Program Production) system has been developed that enables multiple program producers (directors) working at different locations to collaborate over a computer network and prepare a single program for broadcasting. In this system, information is shared among users by exchanging data edited on non-linear editing terminals in program post-production work over a network in real time. In short, the new DTPP system provides a collaborative work space for producing TV programs. The system does not make use of a special server for collaborative work but rather multiple interconnected editing terminals having the same functions. In this configuration, data at a terminal which has just been edited by some operation is forwarded to all other connected terminals for updating. This form of information sharing, however, requires that some sort of data synchronizing method be established since multiple terminals are operating on the same data simultaneously. We therefore adopt a method whereby the system synchronizes the clocks on each terminal at the time of connection and sends an operation time stamp together with edited data. This enables most recently modified data to be identified and all information on all terminals to be updated appropriately. This paper provides an overview of this new collaborative DTPP system and describes the techniques for exchanging edited data and synchronizing data.

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Design of An Effective Resource Allocation System in the Satellite Network using MF-TDMA DAMA Method (MF-TDMA DAMA 방식 위성 망에서 효율적인 자원할당 시스템 설계)

  • Heo, Jun;Choi, Yong-Hoon
    • Journal of the Korea Society of Computer and Information
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    • v.17 no.3
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    • pp.85-93
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    • 2012
  • In this paper, I designed the satellite system, using the MF-TDMA (Multi Frequency-Time Division Multiple Access) DAMA (Demand-Assigned Multiple Access) method, that allocates the satellite resources more effectively to prevent a large quantity data discard when Earth Terminals (ETs) request their satellite network resource to Network Controller (NC) by using their history information, such as traffic pattern or traffic class which have been receiving, and the network controller allocates the satellite network resource and send to earth terminals by using his history information that earth terminals have been requested already. The U.S. Military Warfighter Information Network-Tactical (WIN-T) community has selected the L-3 Linkabit MF-TDMA DAMA Network Centric Waveform (NCW) as the networking standard for full-mesh IP over SHF satellite communications. In the MF-TDMA DAMA satellite network, network controller allocates the satellite network resources and enables maximum 255 earth terminals to communicate each other for periodic satellite network resource requests of earth terminals.

Relay-assisted Multiple Access Channel Protocol for Cooperative Diversity

  • Kim, Dong-Hyun;Kim, Gil;Lee, Kwang-Bok
    • The Journal of Korean Institute of Communications and Information Sciences
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    • v.34 no.1C
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    • pp.1-8
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    • 2009
  • Cooperative diversity is a novel technique to improve diversity gains, capacity gains, and energy saving. This technique involves multiple terminals sharing resources in order to build a virtual antenna array in a distributed fashion. In this paper, we propose a multi-user cooperative diversity protocol called Relay-assisted Multiple Access Channel(R-MAC) that allows multiple source terminals to transmit their signals simultaneously and the relay terminal forwards the aggregated signal received from the source terminals to the destination terminal. The proposed protocol converts the distributed antenna channels into an effective MIMO channel by exploiting a relay, increasing both diversity gain and system throughput. We investigate the performance of the proposed protocol in terms of outage probability and diversity-multiplexing tradeoff where we assume block fading channel environment. Our simulation results show that the proposed protocol outperforms direct transmission in the high spectral efficiency regime where the conventional cooperative diversity protocols cannot outperform direct transmission.

A POLLED DISPATCHING STRATEGY FOR AUTOMATED GUIDED VEHICLES IN PORT CONTAINER TERMINALS

  • Bae, Jong Wook;Kim, Kap Hwan
    • Management Science and Financial Engineering
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    • v.6 no.2
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    • pp.47-67
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    • 2000
  • It is discussed how to assign delivery tasks to automated guided vehicles (AGVs) for multiple container cranes in automated container terminals. The primary goal of dispatching AGVs is to complete all the lading and discharging operations as early as possible, and the secondary goal is to minimize the total travel distance of AGVs. It is assumed that AGVs are not dedicated to a specific container crane but shared among multiple cranes. A mathematical formulation is developed and a heuristic algorithm is suggested to obtain a near optimal solution with a reasonable amount of computational time. The single-cycle and the dual-cycle operations in both the seaside and the landside operations are analyzed. The effects of pooling AGVs for multiple container cranes on the performance of an entire AGV system are also analyze through a numerical experiment.

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Communications Protocol Used in the Wireless Token Rings for Bird-to-Bird

  • Nakajima, Isao;Juzoji, Hiroshi;Ozaki, Kiyoaki;Nakamura, Noboru
    • Journal of Multimedia Information System
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    • v.5 no.3
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    • pp.163-170
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    • 2018
  • We developed a multicast communication packet radio protocol using a time-sharing tablet system ("wireless token ring") to achieve the efficient exchange of files among packet radio terminals attached to swans. This paper provides an overview of the system and the protocol of the packet communications. The packet device forming the main part of the transceiver developed is the Texas Instruments CC2500. This device consists of one call-up channel and one data transmission channel and could improve error frame correction using FEC (forward error correction) with 34.8 kbps MSK and receiving power of at least -64 dBm (output 1 dBm at distance of 200 m using 3 dBi antenna). A time-sharing framework was determined for the wireless token ring using call sign ordinals to prevent transmission right loss. Tests using eight stations showed that resend requests with the ARQ (automatic repeat request) system are more frequent for a receiving power supply of -62 dBm or less. A wireless token ring system with fixed transmission times is more effective. This communication protocol is useful in cases in which frequency resources are limited; the energy consumed is not dependent on the transmission environment (preset transmission times); multiple terminals are concentrated in a small area; and information (position data and vital data) is shared among terminals under circumstances in which direct communication between a terminal and the center is not possible. The method allows epidemiological predictions of avian influenza infection routes based on vital data and relationships among individual birds based on the network topology recorded by individual terminals. This communication protocol is also expected to have applications in the formation of multiple in vivo micromachines or terminals that are inserted into living organisms.

Impedance Analysis of High Integrated Sensor Array Using Impedance Relation Matrix (임피던스 관계 행렬을 이용한 고집적 센서 어레이의 임피던스 분석에 관한 연구)

  • Lee, Hak-Sung
    • Journal of the Institute of Electronics Engineers of Korea SC
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    • v.48 no.3
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    • pp.1-5
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    • 2011
  • In order to analyze the impedance properties of high integrated impedance network with multiple terminals, this paper introduces the concept of impedance relation matrix(IRM). The linear relation between the terminal voltages and currents is represented in the form of IRM and this matrix can be utilized to calculate the impedance between any two terminals. Furthermore, IRM representation for 2-port impedance network can be also defined. The whole impedance network is divided into the several 2-port sub-networks and each sub-network is analyzed in a form of the IRM representation. An illustrated example is given to show that the proposed method is simple and effective to analyze the impedance of a sensor array which has a very large number of impedance elements.

MAC Protocol based on Spreading Code Status-Sensing Scheme for Integrated Voice/Data Services (확산코드 상태 감지 기법에 의한 통합 음성/데이터 서비스 MAC 프로토콜)

  • 임인택
    • Journal of the Korea Institute of Information and Communication Engineering
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    • v.5 no.5
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    • pp.916-922
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    • 2001
  • A medium access control protocol is proposed for integrated voice and data services in the packet CDMA network with a small coverage. Uplink channels are composed of time slots and multiple spreading codes for each slot. This protocol gives higher access priority to the delay-sensitive voice traffic than to the data traffic. During a talkspurt, voice terminals reserve a spreading code to transmit multiple voice packets. On the other hand, whenever generating a data packet, data terminals transmit a packet based on the status Information of spreading codes in the current slot, which is received from base station. In this protocol, voice packet does not come into collision with data packet. Therefore, this protocol can increase the maximum number of voice terminals.

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A Multiple Access Scheme Using Split and Merge Algorithm for Centralized Wireless MAC Protocols (중앙 집중형 무선 매체 접근 제어 프로토콜을 위한 분할 및 합병 알고리즘을 이용한 다중 접근 방안)

  • Kim Min-Su;Byun Tae-Young
    • The Journal of Korean Institute of Communications and Information Sciences
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    • v.31 no.8B
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    • pp.757-763
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    • 2006
  • In this paper, a novel multiple access scheme using SMA(Split and Merge Algorithm) is proposed to reduce the accessdelay of wireless MAC protocols. The key idea of the SMA is to dynamically split and merge the contending terminals depending on their traffic loads for effective control of access to the channels. The SMA divides the collided terminals into several sub-groups if a collision occurs and merges the idle terminals of the split sub-groups into their original group. The merge algorithm can be used to resolve collision and split operation can be used to dynamic group management. The simulation results indicate that our algorithm may provide a higher throughput and a lower collision rate than the existing algorithms, especially under heavy traffic loads.

A New Moving Mobile Base Station (MMBS) Scheme for Low Power RMIMS Wireless System(PartII:Multiple MMBS service schemes for RMIS QoS guarantee) (저전력 RMIMS 무선 터미널을 위한 새로운 움직이는 이동 기지국 시스템 구조(2부:QoS 보장을 위한 다중 MMBS 서비스 구조))

  • 박수열;고윤호;유상조;김성대
    • The Journal of Korean Institute of Communications and Information Sciences
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    • v.24 no.12B
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    • pp.2320-2334
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    • 1999
  • In this paper, we propose multiple IS-MMBS service schemes for very low power and micro-size RMIMS (radio-interfaced micro information monitoring system) terminals. In MMBS service area, when new arrival RMIMS terminals have real-time traffic characteristic or large traffic bandwidth, only single IS-MMBS service scheme can not guarantee RMIMS terminal's QoS(quality of service) such as buffer overflow or packet loss. In this case, the proposed multiple IS-MMBS service schemes can be effectively used for QoS service of RMIMS terminal. According to clustering method of RMIMS terminals and MMBS segment method, the proposed schemes can be divided into terminal segment method, region segment method, application based segment method, traffic type based segment method, overlapping segment method and hybrid segment method

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