• Title/Summary/Keyword: Low-Power Embedded System

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Design and Implementation of Embedded System based on AM3359 Microprocessor (AM3359 마이크로프로세서 기반 임베디드 시스템 설계 및 제작)

  • Kim, Hyoung-Woo;Kim, Se-Jun;Choi, Joon-Young
    • IEMEK Journal of Embedded Systems and Applications
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    • v.12 no.2
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    • pp.89-96
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    • 2017
  • We develop an embedded system to measure various sensor data, control multiple motors, and communicate with mobile devices for system managements. Choosing TI AM3359 microprocessor featuring high processing performance, low power consumption, and various I/O device support, we design and build the embedded system hardware so that it supports multiple global positioning system (GPS) and gyro sensor modules to measure precise position; multiple pulse width modulation (PWM) outputs to control multiple direct current (DC) motors; a Bluetooth module to communicate with mobile devices. Then, we port the boot loader and device drivers to the built circuit board and construct the firmware development environment for the application programming. The performance of the designed and implemented embedded system is demonstrated by real motor control test using GPS and gyro sensor data and control parameters configured by a mobile device.

Trends in Low-Power On-Device Vision SW Framework Technology (저전력 온디바이스 비전 SW 프레임워크 기술 동향)

  • Lee, M.S.;Bae, S.Y.;Kim, J.S.;Seok, J.S.
    • Electronics and Telecommunications Trends
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    • v.36 no.2
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    • pp.56-64
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    • 2021
  • Many computer vision algorithms are computationally expensive and require a lot of computing resources. Recently, owing to machine learning technology and high-performance embedded systems, vision processing applications, such as object detection, face recognition, and visual inspection, are widely used. However, on-devices need to use their resources to handle powerful vision works with low power consumption in heterogeneous environments. Consequently, global manufacturers are trying to lock many developers into their ecosystem, providing integrated low-power chips and dedicated vision libraries. Khronos Group-an international standard organization-has released the OpenVX standard for high-performance/low-power vision processing in heterogeneous on-device systems. This paper describes vision libraries for the embedded systems and presents the OpenVX standard along with related trends for on-device vision system.

A Dynamic Frequency Controlling Technique for Power Management in Existing Commercial Microcontrollers

  • Lueangvilai, Attakorn;Robertson, Christina;Martinez, Christopher J.
    • Journal of Computing Science and Engineering
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    • v.6 no.2
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    • pp.79-88
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    • 2012
  • Power continues to be a driving force in central processing units (CPU) design. Most of the advanced breakthroughs in power have been in a realm that is applicable to workstation CPUs. Advanced power management systems will manage temperature, dynamic voltage scaling and dynamic frequency scaling in a CPU. The use of power management systems for microcontrollers and embedded CPUs has been modest, and mostly focuses on very large scale integration (VLSI) level optimizations compared to system level optimizations. In this paper, a dynamic frequency controlling (DFC) technique is introduced, to lay the foundation of a system level power management system for commercial microcontrollers. The DFC technique allows a commercial microcontroller to have minor modifications on both the hardware and software side, to allow the clock frequency to change to save power; results in this study show a 10% savings. By adding an additional layer of software abstraction at the interrupt level, the microcontroller can operate without having knowledge of the current clock frequency, and this can be accomplished without having to use an embedded operating system.

Hierarchical Event Detection for Low-Energy Operation In Video Surveillance Embedded System (영상 감시용 임베디드 시스템에서의 저에너지 동작을 위한 계층적 사건 탐지)

  • Kim, Tae-Rim;Kim, Bum-Soo;Kim, Dae-Joon;Kim, Geon-Su
    • Journal of the Institute of Convergence Signal Processing
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    • v.12 no.3
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    • pp.204-211
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    • 2011
  • Embedded systems require intensively complex and high power dissipating modules that have the capability of real-time high performance data processing, wide bandwidth communication, and low power consumption. However, the current battery technology has not been developed as much as meeting the requirements of portable embedded systems for long system lifetime. In this paper, new approach that operates with low energy consumption is proposed to overcome the situation while guaranteeing detection accuracy. The designed method associates a variety of detection algorithms hierarchically to detect events happening around the system. The Change for energy consumption characteristics is shown with change for probabilistic characteristics and those relationships are analytically explained from experiments. Furthermore, several techniques to consume low energy and achieve high detection accuracy are described, depending on the event static or dynamic characteristics.

Design of Low Power Processor based Sensor Node Hardware for Applications of Hydroponics (수경재배 적용을 위한 저전력 프로세서 기반의 센서노드 하드웨어 설계)

  • Kang, Mun-Ho;Kim, Tea-Hwa;Choi, Byung-Jae;Kim, Hie-Cheol
    • IEMEK Journal of Embedded Systems and Applications
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    • v.3 no.1
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    • pp.34-41
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    • 2008
  • There are many researches to build up ubiquitous environment by the Ubiquitous Sensor Network(USN). These applications, such as home network, health care, natural environment and agricultural areas, are implemented by an embedded system. Their fields are gradually spreading. However the power consumption in its implementation plays an important role on the surrounding environment of the wireless network. In this paper, we design low power processor based sensor node platform for agricultural applications. We also compare its some performance with existing products.

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Self-Starting Excitation System with Low-Power Permanent Magnet Generator

  • Cho, Chong Hyun;Lee, Dong-Hee
    • Journal of Electrical Engineering and Technology
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    • v.13 no.6
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    • pp.2268-2275
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    • 2018
  • This paper presents a high-efficiency low-power permanent magnet (PM) generator for the power supply of the generator exciter. In the conventional generator system, the power for the exciter is fed by the generator output power or an emergency battery for the starting. The proposed low-power PM generator can generate the proper power and voltage to excite the exciter field winding. According to the starting of the generator, the designed PM generator can supply the constant voltage to the Automatic Voltage Regulator (AVR), then it can be used to control of exciter field current for the generator. Because of the designed PM generator which is placed inside the conventional generator system, the emergency battery and Potential Transducer(PT) for AVR can be removed. Thus, the total efficiency can be improved. The proposed generator system is tested in the practical system. And the efficiency characteristic is analyzed.

Implementation of Self Diagnostics Low-power Embedded Linux System using Telematics (텔레매틱스을 통한 자가진단 저전력 임베디드 리눅스 시스템 구현)

  • Ju, Jae-han
    • Journal of Advanced Navigation Technology
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    • v.21 no.3
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    • pp.300-305
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    • 2017
  • It is necessary to establish a system suitable for the driving vehicle so that it can effectively search for and modify various data anywhere and anytime by effectively linking communication with the computer system in the running vehicle and to control the equipment properly for smooth operation on a limited platform do. Also, vehicle CAN communication is used to extract system engine information, and data is transmitted using ZigBee for this information transmission. Therefore, OBD-II protocol, which is provided by the vehicle itself, is used for vehicle CAN to obtain vehicle status information and exhaust gas using various sensor information of the vehicle and O2 sensor value, and transmits it to the ZigBee main control system. In this study, we implemented a system that can reduce the battery load damage to the maximum by reducing the power consumption to the maximum, and to monitor the internal state of the vehicle through ZigBee communication with the embedded system for low power vehicles.

Collaborative Streamlined On-Chip Software Architecture on Heterogenous Multi-Cores for Low-Power Reactive Control in Automotive Embedded Processors (차량용 임베디드 프로세서에서 저전력 반응적 제어를 위한 이기종 멀티코어 협력적 스트리밍 온-칩 소프트웨어 구조)

  • Jisu, Kwon;Daejin, Park
    • IEMEK Journal of Embedded Systems and Applications
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    • v.17 no.6
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    • pp.375-382
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    • 2022
  • This paper proposes a multi-core cooperative computing structure considering the heterogeneous features of automotive embedded on-chip software. The automotive embedded software has the heterogeneous execution flow properties for various hardware drives. Software developed with a homogeneous execution flow without considering these properties will incur inefficient overhead due to core latency and load. The proposed method was evaluated on an target board on which a automotive MCU (micro-controller unit) with built-in multi-cores was mounted. We demonstrate an overhead reduction when software including common embedded system tasks, such as ADC sampling, DSP operations, and communication interfaces, are implemented in a heterogeneous execution flow. When we used the proposed method, embedded software was able to take advantage of idle states that occur between heterogeneous tasks to make efficient use of the resources on the board. As a result of the experiments, the power consumption of the board decreased by 42.11% compared to the baseline. Furthermore, the time required to process the same amount of sampling data was reduced by 27.09%. Experimental results validate the efficiency of the proposed multi-core cooperative heterogeneous embedded software execution technique.

Memory Usage Based Device Frequency Adjustment for an Embedded Linux System (임베디드 리눅스 환경에서 메모리 사용량에 근거한 에너지 효율적 디바이스 주파수 변경 기법)

  • Jang, Jaehyeon;Park, Moonju
    • KIISE Transactions on Computing Practices
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    • v.22 no.10
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    • pp.513-520
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    • 2016
  • As IoT devices become more common in the public sphere, the energy efficiency of embedded systems becomes a problem of major interest in addition to the system performance. Energy efficiency is important for portable embedded systems because they obtain power from their battery, and a low energy efficiency will result in a low usage time while a high energy efficiency will allow for longer usage time. In this paper, we propose a memory usage based frequency selection method to improve the energy efficiency of embedded Linux systems by using devfreq to select the device's system frequency. In our experiments, we found that the proposed method reduces energy consumption in an embedded device by up to 18%.

Image Objects Detection Method for the Embedded System (임베디드 시스템을 위한 영상객체의 검출방법)

  • Kim, Yun-Il;Rho, Seung-Ryong
    • Journal of Institute of Control, Robotics and Systems
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    • v.15 no.4
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    • pp.420-425
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    • 2009
  • In this paper, image detection and recognition algorithms are studied with respect to embedded carrier system. There are many suggested techniques to detect and recognize objects. But they have the propensity to need much calculation for high hit rate. Advanced and modified method needs to study for embedded systems that low power consumption and real time response are requested. The proposed methods were implemented using Intel(R) Open Source Computer Vision Library provided by Intel Corporation. And they run and tested on embedded system using a ARM920T processor by cross-compiling. They showed 1.6sec response time and 95% hit rate and supported the automated moving carrier system smoothly.