• Title/Summary/Keyword: Sensor interfaces

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Implementation of high-speed parallel data transfer for MCG signal acquisition (심자도 신호 획득을 위한 고속 병렬 데이터 전송 구현)

  • Lee, Dong-Ha;Yoo, Jae-Tack
    • Proceedings of the Korean Institute of Electrical and Electronic Material Engineers Conference
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    • 2004.11a
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    • pp.444-447
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    • 2004
  • A heart diagnosis system adopts hundreds of Superconducting Quantum Interface Device(SQUID) sensors for precision MCG(Magnetocardiogram) or MEG(Magnetoencephalogram) signal acquisitions. This system requires correct and real-time data acquisition from the sensors in a required sampling interval, i.e., 1 mili-second. This paper presents our hardware design and test results, to acquire data from 256 channel analog signal with 1-ksample/sec speed, using 12-bit 8-channel ADC devices, SPI interfaces, parallel interfaces, and 8-bit microprocessors. We chose to implement parallel data transfer between microprocessors as an effective way of achieving such data collection. Our result concludes that the data collection can be done in 250 ${\mu}sec$ time-interval.

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Development of an IoT Platform for Ocean Observation Buoys

  • Kim, Si Moon;Lee, Un Hyun;Kwon, Hyuk Jin;Kim, Joon-Young;Kim, Jeongchang
    • IEIE Transactions on Smart Processing and Computing
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    • v.6 no.2
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    • pp.109-116
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    • 2017
  • In this paper, we propose an Internet of Things (IoT) platform for ocean observation buoys. The proposed system consists of various sensor modules, a gateway, and a remote monitoring site. In order to integrate sensor modules with various communications interfaces, we propose a controller area network (CAN)-based sensor data packet and a protocol for the gateway. The proposed scheme supports the registration and management of sensor modules so as to make it easier for the buoy system to manage various sensor modules. Also, in order to extend communication coverage between ocean observation buoys and the monitoring site, we implement a multi-hop relay network based on a mesh network that can provide greater communication coverage than conventional buoy systems. In addition, we verify the operation of the implemented multi-hop relay network by measuring the received signal strength indication between buoy nodes and by observing the collected data from the deployed buoy systems via our monitoring site.

3D-Porous Structured Piezoelectric Strain Sensors Based on PVDF Nanocomposites (PVDF 나노 복합체 기반 3차원 다공성 압전 응력 센서)

  • Kim, Jeong Hyeon;Kim, Hyunseung;Jeong, Chang Kyu;Lee, Han Eol
    • Journal of Sensor Science and Technology
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    • v.31 no.5
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    • pp.307-311
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    • 2022
  • With the development of Internet of Things (IoT) technologies, numerous people worldwide connect with various electronic devices via Human-Machine Interfaces (HMIs). Considering that HMIs are a new concept of dynamic interactions, wearable electronics have been highlighted owing to their lightweight, flexibility, stretchability, and attachability. In particular, wearable strain sensors have been applied to a multitude of practical applications (e.g., fitness and healthcare) by conformally attaching such devices to the human skin. However, the stretchable elastomer in a wearable sensor has an intrinsic stretching limitation; therefore, structural advances of wearable sensors are required to develop practical applications of wearable sensors. In this study, we demonstrated a 3-dimensional (3D), porous, and piezoelectric strain sensor for sensing body movements. More specifically, the device was fabricated by mixing polydimethylsiloxane (PDMS) and polyvinylidene fluoride nanoparticles (PVDF NPs) as the matrix and piezoelectric materials of the strain sensor. The porous structure of the strain sensor was formed by a sugar cube-based 3D template. Additionally, mixing methods of PVDF piezoelectric NPs were optimized to enhance the device sensitivity. Finally, it is verified that the developed strain sensor could be directly attached onto the finger joint to sense its movements.

Human-Friendly Interfaces of a Robot Manipulator Control System for Handicapped Person

  • Lim, Soo-chul;Lee, Kyoobin;Kwon, Dong-Soo
    • 제어로봇시스템학회:학술대회논문집
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    • 2002.10a
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    • pp.84.1-84
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    • 2002
  • A Human-Robot-Interface(HRI) for the disabled Person is developed. $\textbullet$ HRI consists of the laser pointer '||'&'||' USB camera and pressure sensor. $\textbullet$ HRI makes three degree of freedom. $\textbullet$ Three robot position control method with the Interface is presented. $\textbullet$ Experimental results show that user control the 6 DOF robot with the interface and control method.

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The Characteristic of $SnO_2$ Thin Films Grown by LP-Thermal MOCVD (LP-Thermal MOCVD 방법을 이용한 $SnO_2$ 박막의 증착 시간에 따른 특성)

  • Jeong, Jin
    • Journal of Integrative Natural Science
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    • v.1 no.1
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    • pp.54-57
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    • 2008
  • This report examines the variation on structural properties of $SnO_2$ thin films. TEM studies shows some of the interfaces to be atomically faceted. Secondary X-ray photoelectron Spectroscopy Analysis(XPS) depth profiles show that films have a uniform composition along the depth.

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Software Platform for Stability Assure of Sensor Network in u-Health Environment (유헬스 환경에서 센서네트워크의 안정성 보장을 위한 소프트웨어 플랫폼)

  • Jung, Min Woo;Cho, Jeonghun
    • IEMEK Journal of Embedded Systems and Applications
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    • v.7 no.5
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    • pp.219-226
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    • 2012
  • The rises of the life index quality together with the medical technology improvement lead to a longer life expectancy. Then a better health care program, especially for elderly, is needed. The common health problems facing those senior citizens are changed from acute diseases to chronic diseases, such as diabetes, hypertension. Then u-Health takes center stage in medical industry. Although u- Health medical device manufacturers have been improving their instruments, these instruments still rely on proprietary technologies without fixed platform. Even if the interface has been provided by the manufacturer, there is no widely-accepted uniform data model to access data of various u-Health devices. IEEE 11073 is a standard attempting to unify the interfaces of all medical devices. In this paper we have proposed a conversion software platform that assures interoperability among medical devices for ubiquitous sensor network. This module uses in order to develop a standard platform of medical system.

Characterization of both adhesion and interfacial interaction between optical fiber coating and structural

  • Brotzu, A.;Felli, F.;Fiori, L.;Caponero, M.A.
    • Smart Structures and Systems
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    • v.4 no.4
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    • pp.439-448
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    • 2008
  • Optical fiber sensors are by now broadly accepted as an innovative and reliable device for structural health monitoring, to be used either embedded into or bonded on structures. The accuracy of the strain measurement achievable by optical fiber sensors is critically dependent on the characteristics of the bonding of the various interface layers involved in the sensor bonding/embedding (structure material and gluing agent, fiber coating and gluing agent, fiber coating and fiber core). In fact, the signal of the bonded/embedded optical fiber sensor must correspond to the strain experienced by the monitored structure, but the quality of each involved interface can affect the strain transfer. This paper faces the characterization, carried on by both mechanical tests and morphological analysis, of the strain transfer function resulting with epoxidic and vinylester gluing agent on polyimide and acrylate coated optical fibers.

Jave based Embedded System Design and Implementation for Real-time Stream Data Processing (Java 기반 실시간 센서 데이터스트림처리 및 임베디드 시스템 구현)

  • Kim, Hyu-Chan;Ko, Wan-Ki;Park, Sang-Yeol
    • Journal of Korea Society of Digital Industry and Information Management
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    • v.4 no.2
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    • pp.1-12
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    • 2008
  • Home network is a technology that provides possibilities of monitoring/controling/mutilating-recognition between optional home network machines in residences. Currently, home network or other networks like entertainment, residential electronic networks are jumbled together with heterogeneous networks in a rampaging condition. In a reality of high expectation for home networks system like the mutual application for various machines, we are required to have the unification technology for conveniences to satisfy expectations. This thesis reflects how to develop Java applications or mutual products based on convenient interfaces actually that process various sensors which create real time data stream in Java platform through Java based sensor data-stream processing embedded middleware design and realization in real time.

Triboelectrification based Multifunctional Tactile Sensors

  • Park, Hyosik;Kim, Jeongeun;Lee, Ju-Hyuck
    • Journal of Sensor Science and Technology
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    • v.31 no.3
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    • pp.139-144
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    • 2022
  • Advanced tactile sensors are receiving significant attention in various industries such as extended reality, electronic skin, organic user interfaces, and robotics. The capabilities of advanced tactile sensors require a variety of functions, including position sensing, pressure sensing, and material recognition. Moreover, they should comsume less power and be bio-friendly with human contact. Recently, a tactile sensor based on the triboelectrification effect was developed. Triboelectric tactile sensors have the advantages of wide material availability, simple structure, and low manufacturing cost. Because they generate electricity by contact, they have low power consumption compared to conventional tactile sensors such as capacitive and piezoresistive. Furthermore, they have the ability to recognize the contact material as well as execute position and pressure sensing functions using the triboelectrification effect. The aim of this study is to introduce the progress of research on triboelectrification-based tactile sensors with various functions such as position sensing, pressure sensing and contact material recognition.

Resource Reservation Based Image Data Transmission Scheme for Surveillance Sensor Networks (감시정찰 센서 네트워크를 위한 자원예약 기반 이미지 데이터 전송 기법)

  • Song, Woon-Seop;Jung, Woo-Sung;Ko, Young-Bae
    • The Journal of Korean Institute of Communications and Information Sciences
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    • v.39C no.11
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    • pp.1104-1113
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    • 2014
  • Future combat systems can be represented as the NCW (Network Centric Warefare), which is based on the concept of Sensor-to-Shooter. A wireless video sensor networking technology, one of the core components of NCW, has been actively applied for the purpose of tactical surveillance. In such a surveillance sensor network, multi-composite sensors, especially consisting of image sensors are utilized to improve reliability for intrusion detection and enemy tracing. However, these sensors may cause a problem of requiring very high network capacity and energy consumption. In order to alleviate this problem, this paper proposes an image data transmission scheme based on resource reservation. The proposed scheme can make it possible to have more reliable image data transmission by choosing proper multiple interfaces, while trying to control resolution and compression quality of image data based on network resource availability. By the performance analysis using NS-3 simulation, we have confirmed the transmission reliability as well as energy efficiency of the proposed scheme.