• Title/Summary/Keyword: implementation algorithm

Search Result 4,233, Processing Time 0.033 seconds

Design of Autocoast Tracking Algorithm by the Prediction of Target Occlusion and its On-Based Implementation (표적 가림 예측에 의한 기억추적 알고리즘 개발 및 구현)

  • Kim, So-Hyun;Jang, Gwang-Il;Kwon, Kang-Hoon;Jung, Jin-Hyun
    • Journal of the Korea Institute of Military Science and Technology
    • /
    • v.12 no.3
    • /
    • pp.354-359
    • /
    • 2009
  • In this paper, the Autocoast algorithm is proposed for EOTS to overcome the target occlusion status. Coast mode, one of tracking modes, is to maintain the servo slew rate with the tracking rate right before the loss of track. The Autocoast algorithm makes decision of entering coast mode by the prediction of target occlusion and tries to refind target after the coast time. This algorithm composes of 3 steps, the first step is the prediction process of the occlusion by target-like background, the second one is the check process of the occlusion happened after background intensity variation, and the last one is the process of refinding target. The result of computer simulation, test under laboratory, and real test with EOTS shows the applicability for the automatic video tracking system.

A fully digitized Vector Control of PMSM using 80296SA (80296SA를 이용한 영구자석 동기전동기 벡터제어의 완전 디지털화)

  • 안영식;배정용;이홍희
    • Proceedings of the KIPE Conference
    • /
    • 1998.11a
    • /
    • pp.5-8
    • /
    • 1998
  • The adaptation to vector control theory is so generalized that it is widely used for implementing the high-performance of AC machine. Nowadays, One-Chip microprocessors or DSP chips are being well-used to implement Vector Control algorithm. DSP Chip have less flexibility for memory decoding and I/O rather than One-Chip microprocessor so that is requires more additional circuit and high cost. And the past One-Chip micro processors have difficult of implementation the complex algorithm because of small memory capacity and low arithmetic performance. Therefore we implemented the vector control algorithm of PMSM(Permanent Magnetic Synchronous Motors) using 80296SA form intel , which have many features as 6M memory space, 500MHz clock frequency, including memory decoding circuit and general I/O, Special I/O(EPA, Interrupt controller, Timer/Count, PWM generator) which is proper controller for the complex algorithm or operation program requiring so much memory capacity, So in this paper we fully digitized the vector control of PMSM included SVPWM Voltage controller using the intel 80296SA

  • PDF

Implementation of an Image Change Detection Algorithm for Ubiquitous Sensor Networks (유비쿼터스 센서 네트워크를 위한 영상 변화 탐지 알고리즘 구현)

  • Kim, Sun-Cheol;Eo, Jin-Woo
    • Proceedings of the IEEK Conference
    • /
    • 2009.05a
    • /
    • pp.54-56
    • /
    • 2009
  • We propose an image change detection algorithm implemented on sensor nodes of the ubiquitous sensor network(USN). The proposed algorithm was designed for the robust detection of image changes regardless of the continuously changing ambient illumination environment. Morphological lowpass filter was used for estimating the illumination component in order to reduce computational burden instead of the existing Gaussian lowpass filter. The decision of the change detection is based on the result of threshold of difference image between two consecutive images. We also propose a new thresholding method using precalculated histogram information. The proposed algorithm was implemented on the MSP430 16bit microprocessor.

  • PDF

Implementation and Tests of Antilock Braking Algorithm for a heavy vehicle

  • Lee, Ki-Chang;Jeongwoo Jeon;Donha Hwang;Kim, Yongjoo
    • 제어로봇시스템학회:학술대회논문집
    • /
    • 2002.10a
    • /
    • pp.67.4-67
    • /
    • 2002
  • Antilock brake System (ABS) is a essential safety equipment for modern vehicles. It prevents wheels from being locked-up when emergency braking of a vehicle is required. So it can improves directional stability of the vehicle, shortens stopping distance. Heavy Vehicles such as trucks and buses use mainly pneumatic pressures for their braking systems, where pneumatic modulators control the flow rate of compressed air thus braking pressures in the wheels. In this paper, a antilock braking algorithm which is suitable for heavy vehicles was developed. This algorithm uses limit cycle of wheels and is implemented in the ABS ECU. The developed algorithm and ECU were tested in the labo..

  • PDF

Design of a motion estimator with systolic array structure (Systolic array 구조를 갖는 움직임 추정기 설계)

  • 정대호;최석준;김환영
    • Journal of the Korean Institute of Telematics and Electronics C
    • /
    • v.34C no.10
    • /
    • pp.36-42
    • /
    • 1997
  • In the whole world, the research about the VLSI implementation of motion estimation algorithm is progressed to actively full (brute force) search algorithm research with the development of systolic array possible to parallel and pipeline processing. But, because of processing time's limit in a field to handle a huge data quantily such as a high definition television, many problems are happened to full search algorithm. In the paper, as a fast processing to using parallel scheme for the serial input image data, motion estimator of systolic array structure verifying that processing time is improved in contrast to the conventional full search algorithm.

  • PDF

IMPLEMENTATION OF IMMERSED BOUNDARY METHOD TO INCOMPRESSIBLE NAVIER-STOKES SOLVER USING SIMPLE ALGORITHM (SIMPLE Algorithm기반의 비압축성 Navier-Stokes Solver와 Immersed Boundary Method)

  • Kim, G.H.;Park, S.O.
    • 한국전산유체공학회:학술대회논문집
    • /
    • 2010.05a
    • /
    • pp.397-403
    • /
    • 2010
  • The Immersed boundary method(IBM) is one of CFD techniques which can simulate flow field around complex objectives using simple Cartesian grid system. In the previous studies the IBM has mostly been implemented to fractional step method based Navier-Stokes solvers. In these cases, pressure buildup near IB was found to occur when linear interpolation and stadard mass conservation is used and the interpolation scheme became complicated when higher order of interpolation is adopted. In this study, we implement the IBM to an incompressible Navier-Stokes solver which uses SIMPLE algorithm. Bi-linear and quadratic interpolation equations were formulated by using only geometric information of boundary to reconstruct velocities near IB. Flow around 2D circular cylinder at Re=40 and 100 was solved by using these formulations. It was found that the pressure buildup was not observed even when the bi-linear interpolation was adopted. The use of quadratic interpolation made the predicted aerodynamic forces in good agreement with those of previous studies.

  • PDF

Development of 2-Dim Lagrangian Hydrocode and Application to Large Deformation Problems (2차원 Lagrangian Hydrocode 개발 및 대변형 해석)

  • Lee, Min-Hyung;Kim, Sung-Woo
    • Transactions of the Korean Society of Mechanical Engineers A
    • /
    • v.27 no.3
    • /
    • pp.409-415
    • /
    • 2003
  • The purpose of this paper is to develop the 2-Dim Lagrangian Hydrocode for the analysis of large deformations of solids with implementation of the contact algorithm. First, th e governing equations are discretized into a system of algebraic equations. For more accurate and robust contact force computation. the defense node contact algorithm was adopted and implemented. For the verification of the code developed, two cases are carried out; the Taylor-Impact test and two bodies impact. The von -Mises criterion is implemented into the code with the Shock equation of state. The simulation results show a good agreement compared with the published experimental data and results from the commercial code. It is necessary to implement several material models and failure models for applications to different impact and penetration problems.

Washout Algorithm with Fuzzy-Based Tuning for a Motion Simulator

  • Song, Jae-Bok;Jung, Ui-Jung;Ko, Hee-Dong
    • Journal of Mechanical Science and Technology
    • /
    • v.17 no.2
    • /
    • pp.221-229
    • /
    • 2003
  • In the virtual environment, reality can be enhanced by offering the motion based on a motion simulator in harmony with visual and auditory modalities. In this research the Stewart-Gough-platform-based motion simulator has been developed. Implementation of vehicle dynamics is necessary in the motion simulator for realistic sense of motion, so bicycle dynamics is adopted in this research. In order to compensate for the limited range of the motion simulator compared with the real vehicle motion, washout algorithm composed of high-pass filter, low-pass filter and tilt coordination is usually employed. Generally, the washout algorithm is used with fixed parameters. In this research a new approach is proposed to tune the filter parameters based on fuzzy logic in real-time. The cutoff frequencies of the filters are adjusted according to the workspace margins and driving conditions. It is shown that the washout filter with the fuzzy-based parameters presents better performance than that with the fixed ones.

Convergence Analysis and Design of Adaptive Filter for Noise Cancel over High Speed Communication System (고속통신에서의 잡음제거용 적응필터의 수렴성능 분석 및 설계)

  • 조삼호;권승탁;서광석
    • Proceedings of the IEEK Conference
    • /
    • 1999.11a
    • /
    • pp.63-66
    • /
    • 1999
  • Echo and near-end crosstalk(NEXT) can be generated in two-wire duplex transmission. In this paper investigates how to cancel echoes of high speed communication. A pipeline algorithm is used to remove the echoes that high speed communication. It is least mean squared(LMS) algorithm based on the relaxed look-ahead concept, is focused on the pipelined LMS, and its performance is compared to that of the serial LMS algorithm. And we design pipelined adaptive filtering. In advanced of the hardware implementation with VHDL code the performance of pipelined LMS algorithm is verified by the computer simulation.

  • PDF

A New Algorithm for An Efficient Implementation of the MDCT/IMDCT (MDCT/IMDCT의 효율적인 구현을 위한 새로운 알고리즘)

  • 조양기;이원표;인치호;김희석
    • Proceedings of the IEEK Conference
    • /
    • 2003.07e
    • /
    • pp.2471-2474
    • /
    • 2003
  • The modified discrete cosine transform (MDCT) and its inverse transform (IMDCT) are employed in subband/transform coding schemes as the analysis/synthesis filter bank based on time domain aliasing cancellation (TDAC). And they are the most computational intensive operations in layer III of the MPEG audio coding standard. In this paper, we propose a new efficient algorithm for the MDCT/IMDCT computation. It is based on the MDCT/IMDCT computation algorithm using the discrete cosine transforms (DCTs), and it employs two discrete cosine transform of type II(DCT-II) to compute the MDCT/IMDCT. In addition to, it takes advantage of ability in calculating the MDCT/IMDCT computation, where the length of a data block is divisible by 4. The proposed algorithm in this paper requires less calculation complexity than the existing methods. Also, it can be implemented by the parallel structure,, and its structure is particularly suitable for VLSI realization.

  • PDF