• Title/Summary/Keyword: Tracking-gate

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Fuzzy-Inference Control of a PWM Inverter for 400 Hz AC Voltage Regulation (400 Hz AC 전압용 PWM 인버터의 퍼지추론 제어)

  • Lee, Man Hee;Song, Jae Ik;Lee, Kang Woong
    • Journal of Advanced Navigation Technology
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    • v.3 no.1
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    • pp.44-51
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    • 1999
  • In this paper we proposed an output voltage regulation scheme of a single-phase PWM inverter used to obtain a 400 Hz sinusoidal AC voltage for an aircraft. The fuzzy-inference control scheme is designed to achieve good output voltage tracking in the presence of load change or parameter variations. The PWM gate signals are determined by the fuzzy-inference controller using the error between the reference voltage and the feedback voltage and the derivative of error. The tracking performance of.

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The Improvement of the Highest Probability Data Association algorithm with Limited Measurement Numbers(HPDA-LIMN) in the Validation Gate (측정치 개수 제한기법을 이용한 HPDA 알고리즘 성능향상 연구)

  • Lim, Young-Taek;Hong, Young-Ki
    • Journal of the Korea Institute of Military Science and Technology
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    • v.14 no.5
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    • pp.812-817
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    • 2011
  • In this paper, we propose new data association method called the Highest Probability Data Association with Limited Measurement Numbers(HPDA-LIMN) using a Signal Itensity Ordering method applied to tracking in clutter environment. The performance of HPDA-LIMN algorithm is tested in a series of Monte Carlo simulations runs and is compared with the exiting data association method in cluttered environment.

Power Tracking Control of Domestic Induction Heating System using Pulse Density Modulation Scheme with the Fuzzy Logic Controller

  • Nagarajan, Booma;Sathi, Rama Reddy;Vishnuram, Pradeep
    • Journal of Electrical Engineering and Technology
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    • v.9 no.6
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    • pp.1978-1987
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    • 2014
  • Power requirement to the induction heating system varies during the heating process. A closed loop control is required to have a smooth control over the power. In this work, a constant frequency pulse density modulation based power tracking control scheme for domestic induction heating system is developed using the Fuzzy Logic Controller. In the conventional power modulation schemes, the switching losses increase with the change in the load. The proposed pulse density modulation scheme maintains minimum switching losses for the entire load range. This scheme is implemented for the class-D series resonant inverter system. Fuzzy logic controller based power tracking control scheme is developed for domestic induction heating power supply for various power settings. The open loop and closed loop simulation studies are done using the MATLAB/Simulink simulation tool. The control logic is implemented in hardware using the PIC16F877A microcontroller. Fuzzy controller tracks the set power by changing the pulse density of the gate pulses applied to the inverter. The results obtained are used to know the effectiveness of the fuzzy logic controller to achieve the set power.

Experimental & Numerical Result of the filling of Micro Structures in Injection Molding (미세 구조물의 충전에 관한 실험 및 수치해석)

  • Lee J.G.;Lee B.K;Kwon T.H.
    • Proceedings of the Korean Society of Precision Engineering Conference
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    • 2005.10a
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    • pp.111-114
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    • 2005
  • Experimental and numerical studies were carried out in order to investigate the processability and the transcriptability of the injection molding of micro structures. For this purpose, we designed a mold insert having micro rib patterns on a relatively thick base part. Mold insert has a base of 2mm thickness, and has nine micro ribs on that base plate. Width and height of the rib are $300{\mu}m\;and\;1200{\mu}m$, respectively. We found a phenomenon similar to 'race tracking', due to 'hesitation' in the micro ribs. As the melt flows, it starts to cool down and melt front located in the ribs near the gate cannot penetrate further because the flow resistance is large in that almost frozen portion. When the base is totally filled, the melt front away from the gate is not frozen yet. Therefore, it flows back to the gate direction through the ribs. Consequently, transcriptability of the rib far from the gate is better. We also verified this phenomenon via numerical simulation. We further investigated the effects of processing conditions, such as flow rate, packing time, packing pressure, wall temperature and melt temperature, on the transcriptability. The most dominant factor that affects the flow pattern and the transcriptability of the micro rib is flow rate. High flow rate and high melt temperature enhance the transcriptability of micro rib structure. High packing time and high packing pressure result in insignificant dimensional variations of the rib. Numerical simulation also confirms that low flow rate causes a short shot of micro ribs and high wall temperature helps the filling of the micro ribs.

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A Hardware Implementation of Pyramidal KLT Feature Tracker (계층적 KLT 특징 추적기의 하드웨어 구현)

  • Kim, Hyun-Jin;Kim, Gyeong-Hwan
    • Journal of the Institute of Electronics Engineers of Korea SP
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    • v.46 no.2
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    • pp.57-64
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    • 2009
  • This paper presents the hardware implementation of the pyramidal KLT(Kanade-Lucas-Tomasi) feature tracker. Because of its high computational complexity, it is not easy to implement a real-time KLT feature tracker using general-purpose processors. A hardware implementation of the pyramidal KLT feature tracker using FPGA(Field Programmable Gate Array) is described in this paper with emphasis on 1) adaptive adjustment of threshold in feature extraction under diverse lighting conditions, and 2) modification of the tracking algorithm to accomodate parallel processing and to overcome memory constraints such as capacity and bandwidth limitation. The effectiveness of the implementation was evaluated over ones produced by its software implementation. The throughput of the FPGA-based tracker was 30 frames/sec for video images with size of $720{\times}480$.

Evaluation of a FPGA controlled distributed PV system under partial shading condition

  • Chao, Ru-Min;Ko, Shih-Hung;Chen, Po-Lung
    • Advances in Energy Research
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    • v.1 no.2
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    • pp.97-106
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    • 2013
  • This study designs and tests a photovoltaic system with distributed maximum power point tracking (DMPPT) methodology using a field programmable gate array (FPGA) controller. Each solar panel in the distributed PV system is equipped with a newly designed DC/DC converter and the panel's voltage output is regulated by a FPGA controller using PI control. Power from each solar panel on the system is optimized by another controller where the quadratic maximization MPPT algorithm is used to ensure the panel's output power is always maximized. Experiments are carried out at atmospheric insolation with partial shading conditions using 4 amorphous silicon thin film solar panels of 2 different grades fabricated by Chi-Mei Energy. It is found that distributed MPPT requires only 100ms to find the maximum power point of the system. Compared with the traditional centralized PV (CPV) system, the distributed PV (DPV) system harvests more than 4% of solar energy in atmospheric weather condition, and 22% in average under 19% partial shading of one solar panel in the system. Test results for a 1.84 kW rated system composed by 8 poly-Si PV panels using another DC/DC converter design also confirm that the proposed system can be easily implemented into a larger PV power system. Additionally, the use of NI sbRIO-9642 FPGA-based controller is capable of controlling over 16 sets of PV modules, and a number of controllers can cooperate via the network if needed.

A Study on Long Range Image Monitoring and Tracking System Using Laser Range-Gate Method in Inclement Weather Conditions (악천후 상황에서 Laser Range-Gate 방식을 이용한 원거리 영상 감시 및 추적 시스템에 대한 연구)

  • Oh, Sung-Kwun;Yoo, Sung-Hoon;Ku, Kyong-Wan;Kim, Su-Chan
    • The Transactions of The Korean Institute of Electrical Engineers
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    • v.62 no.2
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    • pp.257-263
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    • 2013
  • In case of image observation equipments, CCTV for short distance visual field is usually installed and operated mostly as the means of crime-prevention. However, the extensive demand for monitoring problems in case of the increase in intelligent crimes and disasters has led to the necessity of the development of long-distance observation equipments embedded with Night View functions. In case of the Night View equipments, the relevant market is set up to be focused mostly on Thermal Observation Device(hereinafter, TOD), but some shortcomings such as the limitation of image visibility and excessive maintenance cost, etc. have actually caused the necessity of new long distance Night View equipment. Moreover there might follow lots of difficulties in long-distance visualization in the event that irregular reflection is generated by minute particles in the atmosphere such as fog, smog, and dust, etc. These factors are motivate the work presented in this study. Our study is aimed at the realization of Pulsed Laser Illuminator and newly proposed Range-Gated image acquisition technology. And also the implementation of Tracker for continuous trace of the objects of interest from the obtained sequence images.

Development of High-Speed Real-Time Signal Processing Unit for Small Millimeter-wave Tracking Radar (소형 밀리미터파 추적 레이다용 고속 실시간 신호처리기 개발)

  • Kim, Hong-Rak;Park, Seung-Wook;Woo, Seon-Keol;Kim, Youn-Jin
    • The Journal of the Institute of Internet, Broadcasting and Communication
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    • v.19 no.1
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    • pp.9-14
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    • 2019
  • A small millimeter-wave tracking radar is a pulse-based radar that searches, detects, and tracks a target in real time through a TWS (Track While Scan) method for a traps target on the sea with a large RCS running at low speed. It is necessary to develop a board equipped with a high-speed CPU to acquire and track target information through LPRF, DBS, and HRR signal processing techniques for a trap target operating various kinds of dexterous objects such as chaff and decoy, We designed a signal processor structure including DFT (Discrete Fourier Transform) module design that can perform real - time FFT operation using FPGA (Field Programmable Gate Array) and verified the signal processor implemented through performance test.

A Study on the Influence of the Saemangeum Sluice-Gates Effluent Discharge using the Particle Tracking Model (입자추적 실험을 이용한 새만금 배수갑문 유출수의 영향 범위 연구)

  • Cho, Chang Woo;Song, Yong Sik;Bang, Ki Young
    • Journal of Korean Society of Coastal and Ocean Engineers
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    • v.32 no.4
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    • pp.211-222
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    • 2020
  • This study suggested a method calculating the influence of effluent discharge from Saemangeum sluice-gates using the particle tracking model. For 2017, we presented the seasonal effects of effluent discharge as probability spatial distributions and compared with the results of the water age, one of the indicators of transport time scale. The influence of sluice-gates effluent discharge increases radially around Sinshi or Gaseok gates, which are expected to be biased toward the south in winter and north in summer due to the effect of seasonal winds. Although the results of the prediction are limited to the 2017 situation, the method of calculating the influence of sluice-gates effluent discharge using the Lagrangian particle tracking model can be used to predict the future of the around Saemangeum.

FPGA-DSP Based Implementation of Lane and Vehicle Detection (FPGA와 DSP를 이용한 실시간 차선 및 차량인식 시스템 구현)

  • Kim, Il-Ho;Kim, Gyeong-Hwan
    • The Journal of Korean Institute of Communications and Information Sciences
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    • v.36 no.12C
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    • pp.727-737
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    • 2011
  • This paper presents an implementation scheme of real-time lane and vehicle detection system with FPGA and DSP. In this type of implementation, defining the functionality of each device in efficient manner is of crucial importance. The FPGA is in charge of extracting features from input image sequences in reduced form, and the features are provided to the DSP so that tracking lanes and vehicles are performed based on them. In addition, a way of seamless interconnection between those devices is presented. The experimental results show that the system is able to process at least 15 frames per second for video image sequences with size of $640{\times}480$.