• Title/Summary/Keyword: Microcontroller

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A Study on Random Forest-based Estimation Model for Changing the Automatic Walking Mode of Above Knee Prosthesis (대퇴의족의 자동 보행 모드 변경을 위한 랜덤 포레스트 기반 추정 모델 개발에 관한 연구)

  • Na, Sun-Jong;Shin, Jin-Woo;Eom, Su-Hong;Lee, Eung-Hyuk
    • Journal of IKEEE
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    • v.24 no.1
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    • pp.9-18
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    • 2020
  • The pattern recognition or fuzzy inference, which is mainly used for the development of the automatic walking mode change of the above knee prosthesis, has a disadvantage in that it is difficult to estimate with the immediate change of the walking environment. In order to solve a disadvantage, this paper developed an algorithm that automatically converts the walking mode of the next step by estimating the walking environment at a specific gait phase. Since the proposed algorithm should be implanted and operated in the microcontroller, it is developed using the random forest base in consideration of calculation amount and estimated time. The developed random forest based gait and environmental estimation model were implanted in the microcontroller and evaluated for validity.

Design of FIR filter using direct memory access for voice signal processing module in implantable middle ear hearing devices (이식형 인공중이용 음성신호 처리 모듈을 위한 직접 메모리 억세스 기반의 FIR 필터 설계)

  • Kim, Jong-Min;Park, Il-Yong;Yoon, Young-Ho;Kim, Min-Kyu;Lim, Hyung-Gyu;Han, Ji-Hun;Kim, Myoung-Nam;Cho, Jin-Ho
    • Journal of Sensor Science and Technology
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    • v.15 no.4
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    • pp.223-230
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    • 2006
  • An FIR filter for digital voice signal processing has been designed and implemented using a microcontroller in implantable middle ear hearing devices (IMEHDs). The designed digital voice signal processing filter which has fast and accurate filtering operation and controllable filter characteristics has been implemented using a hardware multiplier and a direct memory access (DMA) in the low power microcontroller, MSP430F169. It has been confirmed that each of the implemented 6-orders Remez FIR filters with 1 channel and 2 channels can be applied to the voice signal processing module of IMEHDs based on the evaluation results of the filtering performance experiment.

Education Equipment and Its Application for Indoor Position Recognition Using Inertial Measurement Unit Sensor (IMU센서를 이용한 실내 위치 인식 교육용 장비 및 응용)

  • Seo, Bo-In;Yu, YunSeop
    • Journal of Practical Engineering Education
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    • v.10 no.2
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    • pp.119-124
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    • 2018
  • Educational equipment that enables the user or device to recognize the indoor position by using the acceleration and angular velocity of the IMU (Inertial Measurement Unit) sensor is introduced. With this educational equipment, various position recognition and tracking algorithms can be learned and creative engineering design works can be realized. The data value of the IMU sensor is transmitted to the MCU (microcontroller unit) through $I^2C$ (Inter-Integrated Circuit), and the indoor position recognition algorithm is applied by processing the data value through the filter and numerical method. It is then designed to use wireless communication to send and receive processed values and to be recognized by the user. As an example using this equipament, the case of "Implementation and recognition of virtual position using computation of moving direction and distance using IMU sensor" is introduced, and various creative engineering design application is discussed.

Design of a customizable fluorescence detection system for fluorescently labeled tumor cells (형광 발현 암세포 탐지를 위한 맞춤형 검출시스템 개발)

  • Cho, Kyoungrae;Seo, Jeong-hyeok;Choe, Se-woon
    • Journal of the Korea Institute of Information and Communication Engineering
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    • v.23 no.3
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    • pp.261-266
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    • 2019
  • Flow cytometry is an electrical detection system that provides precise and diverse optical properties to cells and micro particles. Flow cytometry, which provides multidimensional information including cell size and granularity through light scattering and fluorescence emission generated by the induction of light of a specific wavelength to the fluorescently treated cells or micro particles, plays an important role in biomedical and biophysical fields. However, it has some drawbacks such as high cost, size of the instrument and limitation in selecting fluorescent dyes. Therefore, in this paper, a low cost compact fluorescent detection system is developed using light-emitting diode and microcontroller. The proposed fluorescence detection system has a replaceable the light source/fluorescence filter/photodetector and constructed by 3D printer, so that the user can design a customized system according to the selected fluorescent dyes. The fluorescence intensity was measured by varying the number of fluorescently labeled cells, and the measured intensities showed a high linearity within the tested concentration ranges.

A Portable Impedance Spectroscopy Instrument for the Measurement of the Impedance Spectrum of High Voltage Battery Pack (고압 배터리 팩의 임피던스 스펙트럼 측정용 휴대용 임피던스 분광기)

  • Rahim, Gul;Choi, Woo-Jin
    • The Transactions of the Korean Institute of Power Electronics
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    • v.26 no.3
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    • pp.192-198
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    • 2021
  • The battery's State of Health (SOH) is a critical parameter in the process of battery use, as it represents the Remaining Useful Life (RUL) of the battery. Electrochemical Impedance Spectroscopy (EIS) is a widely used technique in observing the state of the battery. The measured impedance at certain frequencies can be used to evaluate the state of the battery, as it is intimately tied to the underlying chemical reactions. In this work, a low-cost portable EIS instrument is developed on the basis of the ARM Cortex-M4 Microcontroller Unit (MCU) for measuring the impedance spectrum of Li-ion battery packs. The MCU uses a built-in DAC module to generate the sinusoidal sweep perturbation signal. Moreover, it performs the dual-channel acquisition of voltage and current signals, calculates impedance using a Digital Lock-in Amplifier (DLA), and transmits the result to a PC. By using LabVIEW, an interface was developed with the real-time display of the EIS information. The developed instrument was suitable for measuring the impedance spectrum of the battery pack up to 1000 V. The measurement frequency range of the instrument was from 1 hz to 1 Khz. Then, to prove the performance of the developed system, the impedance of a Samsung SM3 battery pack and a Bexel pouch module were measured and compared with those obtained by the commercial instrument.

Development of FlexRay Module based on the AUTOSAR (AUTOSAR 기반의 FlexRay 모듈 개발)

  • Ju, Hong-Taek;Jeong, Seol-Young;Lee, Myung-Suk
    • The KIPS Transactions:PartC
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    • v.16C no.6
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    • pp.747-752
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    • 2009
  • The AUTOSAR(AUTOmotive Open System ARchitecture) is an open software platform for automotive. The AUTOSAR contains the modules of FlexRay that is the next generation automotive network protocol. We have developed the modules including FlexRay State Manager, FlexRay Transport, FlexRay Interface, FlexRay Transceiver Driver and FlexRay Driver based on the standard of the module. This thesis presented not only the result of development but the result of design and implementation. And the developed modules were ported to the microcontroller board and verified.

Modified Unscented Kalman Filter for a Multirate INS/GPS Integrated Navigation System

  • Enkhtur, Munkhzul;Cho, Seong Yun;Kim, Kyong-Ho
    • ETRI Journal
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    • v.35 no.5
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    • pp.943-946
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    • 2013
  • Instead of the extended Kalman filter, the unscented Kalman filter (UKF) has been used in nonlinear systems without initial accurate state estimates over the last decade because the UKF is robust against large initial estimation errors. However, in a multirate integrated system, such as an inertial navigation system (INS)/Global Positioning System (GPS) integrated navigation system, it is difficult to implement a UKF-based navigation algorithm in a low-grade or mid-grade microcontroller, owing to a large computational burden. To overcome this problem, this letter proposes a modified UKF that has a reduced computational burden based on the basic idea that the change of probability distribution for the state variables between measurement updates is small in a multirate INS/GPS integrated navigation filter. The performance of the modified UKF is verified through numerical simulations.

Design Optimization of the Arithmatic Logic Unit Circuit for the Processor to Determine the Number of Errors in the Reed Solomon Decoder (리드솔로몬 복호기에서 오류갯수를 계산하는 처리기의 산술논리연산장치 회로 최적화설계)

  • An, Hyeong-Keon
    • The Journal of Korean Institute of Communications and Information Sciences
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    • v.36 no.11C
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    • pp.649-654
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    • 2011
  • In this paper, we show new method to find number of errors in the Reed-Solomon decoder. New design is much faster and has much simpler logic circuit than the former design method. This optimization was possible by very simplified square calculating circuit and parallel processing. The microcontroller of this Reed Solomon decoder can be used for data protection of almost all digital communication and consumer electronic devices.

Design of Broad Band RF Components for Partial Discharge Monitoring System (부분방전 모니터링 시스템을 위한 광대역 RF 소자설계 연구)

  • Lee, Je-Kwang;Ko, Jae-Hyeong;Kim, Koon-Tae;Kim, Hyeong-Seok
    • The Transactions of The Korean Institute of Electrical Engineers
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    • v.60 no.12
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    • pp.2286-2292
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    • 2011
  • In this paper we present the design of Low Noise Amplifier(LNA), mixer and filter for RF front-end part of partial discharge monitoring system. The monitoring system of partial discharge in high voltage power machinery is used to prevent many kinds of industrial accidents, and is usually composed of three parts - sensor, RF front-end and digital microcontroller unit. In our study, LNA, mixer and filter are key components of the RF front-end. The LNA consists of common gate and common source-cascaded structure and uses the resistive feedback for broad band matching. A coupled line structure is utilized to implement the filter, of which size is reduced by the meander structure. The mixer is designed using dual gate structure for high isolation between RF and local oscillator signal.

Design of Network Controller for Proportional Flow Control Solenoid Valve (비례유량제어밸브 네트워크 제어기 설계)

  • Jung, G.H.
    • Transactions of The Korea Fluid Power Systems Society
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    • v.8 no.4
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    • pp.17-23
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    • 2011
  • Proportional control solenoid is a type of modulating valve that can continuously control the valve position with magnetic force of solenoid. Recent microcontroller based digital servocontroller for proportional valve is being developed toward the smart valve with additional features such as enhanced control algorithm for finer process and intelligent on-board diagnosis for maintenance. In this paper, development of servocontroller network control with CAN bus which is free from problems of security and network traffic jam is presented. Design of network control system includes modes of communication between master and slave, assignment of 29bit message identifier and message objects, transaction of communication sequence, etc. Monitoring function and control experiments for remote valve through CAN network prove the extended function of smart valve control system.