• Title, Summary, Keyword: Hard Reset

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Analysis of Measured Azimuth Error on Sensitivity Calibration Routine (Sensitivity Calibration 루틴 수행시 Tilt에 의한 방위각 측정 오차의 분석)

  • Woo, Kwang-Joon;Kang, Su-Min
    • Journal of the Institute of Electronics Engineers of Korea SC
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    • v.48 no.1
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    • pp.1-8
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    • 2011
  • The accuracy of MR sensor-based electronic compass is influenced by the temperature drift and DC offset of the MR sensor and the OP-amp, the magnetic distortion of nearby magnetic materials, and the compass tilt We design the 3-axis MR sensor and accelerometers-based electronic compass which is compensated by the set/reset pulse switching method on the temperature drift and DC offset, by the execution of hard-iron calibration routine on the magnetic distortion, and by the execution of the Euler rotational equation on the compass tilt. We qualitatively analyze the measured azimuth error on the execution of sensitivity calibration routine which is the normalization process on the different sensitivity of each MR sensor and the different gain of each op-amps. This compensation and analytic result make us design the one degree accuracy electronic compass.

Resolution improvement of a CMOS vision chip for edge detection by separating photo-sensing and edge detection circuits (수광 회로와 윤곽 검출 회로의 분리를 통한 윤곽 검출용 시각칩의 해상도 향상)

  • Kong, Jae-Sung;Suh, Sung-Ho;Kim, Sang-Heon;Shin, Jang-Kyoo;Lee, Min-Ho
    • Journal of Sensor Science and Technology
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    • v.15 no.2
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    • pp.112-119
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    • 2006
  • Resolution of an image sensor is very significant parameter to improve. It is hard to improve the resolution of the CMOS vision chip for edge detection based on a biological retina using a resistive network because the vision chip contains additional circuits such as a resistive network and some processing circuits comparing with general image sensors such as CMOS image sensor (CIS). In this paper, we proved the problem of low resolution by separating photo-sensing and signal processing circuits. This type of vision chips occurs a problem of low operation speed because the signal processing circuits should be commonly used in a row of the photo-sensors. The low speed problem of operation was proved by using a reset decoder. A vision chip for edge detection with $128{\times}128$ pixel array has been designed and fabricated by using $0.35{\mu}m$ 2-poly 4-metal CMOS technology. The fabricated chip was integrated with optical lens as a camera system and investigated with real image. By using this chip, we could achieved sufficient edge images for real application.

Long-Tail Watchdog Timer for High Availability on STM32F4-Based Real-Time Embedded Systems (STM32F4 기반의 실시간 임베디드 시스템의 가동시간 향상을 위한 긴 꼬리 와치독 타이머 기법)

  • Choi, Hayeon;Yun, Jiwan;Park, Seoyeon;Kim, Yesol;Park, Sangsoo
    • Journal of Korea Multimedia Society
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    • v.18 no.6
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    • pp.723-733
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    • 2015
  • High availability is of utmost importance in real-time embedded systems. Temporary failures due to software or hardware faults should not result in a system crash. To achieve high availability, embedded systems typically use a combination of hardware and software techniques. A watchdog timer is a hardware component in embedded microprocessors that can be used to automatically reset the processor if software anomalies are detected. The embedded system relies on a single watchdog timer, however, can be permanently disabled if the timer is not properly configured, e.g. falling into an indefinite loop. STM32F4 provides two different types of watchdog timer in terms of timing accuracy and robustness. In this paper, we propose a hybrid approach, called long-tail watchdog timer, to utilize both timers to achieve self-reliance in embedded systems even though one of timers fails. Experimental results confirm that the proposed approach successfully handles various failure scenarios and present performance comparisons between single watchdog timer and hybrid approach in terms of configuration parameters of watchdog timers in STM32F4, counter value and window size.

A study on the Springmethod for conceiving a good advertising idea (광고아이디어 발상을 위한 스프링법에 관한 연구)

  • 박용원
    • Archives of design research
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    • v.15 no.1
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    • pp.153-161
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    • 2002
  • There exist various conventional ideas, but few ideas may be used for actual production of advertisements. Moreover, because we tend to obtain ideas primarily from the pictures, we rely more and more on data collections, and eventually, we tend to copy them. If there is an idea which designers and copy writers can share, it will be a very effective idea. On the other hard, we need to depart from the individualistic mannerism or the reset-oriented approach depending on incidental manual works and instead, develop a lecture program which helps students e strike systematic ideas centering around processes. In order tn solve such problems, the researcher attempts to suggest "Spring Method" which has heed verified through the advertisement design practice courses at college for 7 semesters. This method focuses on ′visualization of concept′ through such stages as compression, inference and expansion, and therefore, emphasizes an organic linkage between language-oriented idea process and visualization process for advertisement ideas.

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A Study on the High-Efficiency, High-Power-Factor AC/DC Boost Converter Using a Passive Energy Recovery Snubber (에너지 재생 수동 스너버를 적용한 고효율, 고역률 AC/DC Boost 컨버터에 관한 연구)

  • Ryu, Jong-Gyu;Kim, Yong;Baek, Soo-Hyun;Lee, Kyu-Hoon;Jung, Myung-Sub
    • Proceedings of the KIEE Conference
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    • pp.168-171
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    • 2005
  • The conception of the passive lossless snubber with the simpler is presented. Thus a necessity condition of the passive lossless soft switching converter with the simplest topology is directed. A novel passive regenerative snubber called soft snubber applied to a hard switching converter is proposed. The passive snubber consists of a snubber inductor, two snubber rectifiers, and a snubber capacitor. The losses are reduced by inserting a snubber inductor in the series path of the rectifier during it's turn off. It is so simple that can make energy reset or capacitor discharged directly without producing any current circulation. To show the superiority of this converter is verified through the experiment with a 640W, 100kHz prototype converter.

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