• Title, Summary, Keyword: Asynchronous

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Systolic Design with Asynchronous Controls for Digital-Signal Processings (디지털 신호처리를 위한 비동기 제어 시스톨릭 설계)

  • 전문석
    • The Journal of Korean Institute of Communications and Information Sciences
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    • v.18 no.3
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    • pp.410-424
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    • 1993
  • In this paper, we present new techniques for designing systolic arrya and asynchronous arrays for digital-signal processings. More specifically, we propose a systolic array with simple local interconnections which achieves optimal performance without having undesirable features such as preloading input data or global broadcasting. As asynchronous array for digital-signal processings, which can speed up the total computation time significantly is also which can speed up the total computation time significantly is also presented. The key component of the asynchronous array is a presented. The key component of the asynchronous array is a comunicaiton protocol which controls input data flow properly and efficiently. Finally, performance of the arrays is analyzed and a simulation using Occam programmed in a Transputer network is reported.

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Modeling And Simulation of the Switching Time Calculation When Starts Asynchronous Motors using Matlab Software (비동기모터 기동시 Matlab을 이용한 스위칭시간 계산의 모델링 및 시뮬레이션)

  • Bae, Cherl-O;Vuong, Duc-Phuc
    • Proceedings of the Korean Society of Marine Engineers Conference
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    • pp.73-73
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    • 2011
  • In fact, asynchronous motors are used widely. Asynchronous motors which have large power (compared to the source supplies) is needed to start them in various methods. The theory of application reduced voltage to motor's stator or variable resistor fed rotor for the purpose of altering the motor's torque and power consumption characteristics is an idea that has existed for many years. These concepts have flourished mainly due to the need to limit torque and limited generator/power distribution capabilities. However, how can know exactly the time of switching steps with different types of motors as well as load characteristics is very difficult. This paper focuses on the design and development mathematical models of motor[1][2], load, ACB, asynchronous machine and then is implemented in SIMULINK in order to calculate this time, special on ships where power generation station is limited. The simulation results are both compared and discussed in detail so that it can apply to conclude the most suitable and applicable starting time for new system with various motors and load.

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Corrective Control of Asynchronous Sequential Machines for Tolerating Permanent Faults (교정 제어를 이용한 비동기 순차 머신의 영구 고장 극복)

  • Yang, Jung-Min
    • Journal of the Institute of Electronics Engineers of Korea SC
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    • v.47 no.5
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    • pp.9-17
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    • 2010
  • Corrective control compensates the stable-state behavior of asynchronous sequential machines so that the closed-loop system can be changed in a desirable way. Using corrective control, we present a novel fault tolerance scheme that overcomes permanent faults for asynchronous sequential machines. When a permanent fault occurs to an asynchronous machine, the fault is not recovered forever while the machine is irreversibly stuck in a set of failure states. But, if the machine has control redundancy in the limited behavior range, corrective control can be applied to solve the fault tolerance problem against permanent faults. We present the condition on detecting permanent faults and the existence condition of an appropriate corrective controller. The design procedure for the proposed controller is described in a case study.

Real time orbit estimation using asynchronous multiple RADAR data fusion (비동기 다중 레이더 융합을 통한 실시간 궤도 추정 알고리즘)

  • Song, Ha-Ryong;Moon, Byoung-Jin;Cho, Dong-Hyun
    • Aerospace Engineering and Technology
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    • v.13 no.2
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    • pp.66-72
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    • 2014
  • This paper introduces an asynchronous multiple radar fusion algorithm for space object tracking. To estimate orbital motion of space object, a multiple radar scenario which jointly measures single object with different sampling time indices is described. STK/ODTK is utilized to determine realization of orbital motion and joint coverage of multiple radars. Then, asynchronous fusion algorithm is adapted to enhance the estimation performance of orbital motion during which multiple radars measure the same time instances. Monte-Carlo simulation results demonstrate that the proposed asynchronous multi-sensor fusion scheme better than single linearized Kalman filter in an aspect of root mean square error.

Instruction-level Power Model for Asynchronous Processor, A8051 (비동기식 프로세서 A8051의 명령어 레벨 소비 전력 모델)

  • Lee, Je-Hoon
    • The Journal of the Korea Contents Association
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    • v.12 no.7
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    • pp.11-20
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    • 2012
  • This paper presents new instruction-level power model for an asynchronous processor, A8051. Even though the proposed model estimates power consumption as instruction level, this model reflects the behavioral features of asynchronous pipeline during the program is executed. Thus, it can effectively enhance the accuracy of power model for an asynchronous embedded processor without significant complexity of power model as well as the increase of simulation time. The proposed power model is based on the implementation of A8051 to reflect the characteristics of power consumption in A8051. The simulation results of the proposed model is compared with that of gate-level synthesized A8051. The proposed power model shows the accuracy of 94% and the simulation time for estimation the power consumption was reduced to 1,600 times.

Array Structure for Asynchronous Low Power Multiplier (저전력 비동기 곱셈기를 위한 배열 구조)

  • 박찬호;최병수;이동익
    • Proceedings of the IEEK Conference
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    • pp.141-144
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    • 2000
  • In this paper, a new parallel array structure for the asynchronous array multiplier is introduced. This structure is designed for a data dependent asynchronous multiplier to reduces power which is wasted in conventional array structure. Simulation shows that this structure saves 30% of power and 55% of computation time comparing to conventional booth encoded array multiplier.

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A Static Latched DCVSL Circuits for Asynchronous Pipeline Scheme (비동기 파이프라인 구조를 위한 정적 래치 DCVSL 회로)

  • 김영우;김수원
    • Proceedings of the IEEK Conference
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    • pp.759-762
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    • 1998
  • In this paper, a SL-DCVSL (static latched differential cascode voltage switch logic) circuit for the asynchronous pipeline is proposed. The proposed SL-DCVSL circuit is a slightly modified version of the DCVSL circuit, and used to improve the storage capability of the precharged functional blocks. The proposed SL-DCVSL has more robust storage characteristics compared to the conventional LDCVSL (latched DCVSL〔2〕). The operation of the proposed circuit is verified by simulating the asynchronous FIFO (First-In First-Out) structure.

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Application of a Parallel Asynchronous Algorithm to Some Grid Problems on Workstation Clusters

  • Park, Pil-Seong
    • Ocean and Polar Research
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    • v.23 no.2
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    • pp.173-179
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    • 2001
  • Parallel supercomputing is now a must for oceanographic numerical modelers. Most of today's parallel numerical schemes use synchronous algorithms, where some processors that have finished their tasks earlier than others must wait at synchronization points for correct computation. Hence, the load balancing is a crucial factor, however, it is, in general, difficult to achieve on heterogeneous workstation clusters. We devise an asynchronous algorithm that reduces the idle times of faster processors, and discuss application of the algorithm to some grid problems and implementation on a workstation cluster using Message Passing Interface (MPI).

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Asynchronous Decentralized Optimization Method for Coordinating Electricity Markets (비동기분산처리 방식을 이용한 연계전력시장청산)

  • Moon, Guk-Hyun;Huang, Anni;Joo, Sung-Kwan;Wi, Young-Min;Song, Kyung-Bin
    • Proceedings of the KIEE Conference
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    • pp.832-833
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    • 2007
  • This paper presents an asynchronous decentralized optimization method to coordinate energy trading between electricity markets. The proposed method decomposes the market optimization problem of interconnected electricity markets into individual market optimization problems. The decomposed problem is solved by using the Interior Point/Cutting Plane (IP/CP) method with asynchronous communication model. A numerical example is presented to validate the effectiveness of the proposed method.

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Cluster Based Clock Synchronization for Sensor Network

  • Rashid Mamun-Or;HONG Choong Seon
    • Proceedings of the Korean Information Science Society Conference
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    • pp.415-417
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    • 2005
  • Core operations (e.9. TDMA scheduler, synchronized sleep period, data aggregation) of many proposed protocols for different layer of sensor network necessitate clock synchronization. Our Paper mingles the scheme of dynamic clustering and diffusion based asynchronous averaging algorithm for clock synchronization in sensor network. Our proposed algorithm takes the advantage of dynamic clustering and then applies asynchronous averaging algorithm for synchronization to reduce number of rounds and operations required for converging time which in turn save energy significantly than energy required in diffusion based asynchronous averaging algorithm.

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