• Title, Summary, Keyword: 소형 IoT 센서

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Metallic FDM Process to Fabricate a Metallic Structure for a Small IoT Device (소형 IoT 용 금속 기구물 제작을 위한 금속 FDM 공정 연구)

  • Kang, In-Koo;Lee, Sun-Ho;Lee, Dong-Jin;Kim, Kun-Woo;Ahn, Il-Hyuk
    • Journal of The Korea Internet of Things Society
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    • v.6 no.4
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    • pp.21-26
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    • 2020
  • An autonomous driving system is based on the deep learning system built by big data which are obtained by various IoT sensors. The miniaturization and high performance of the IoT sensors are needed for diverse devices including the autonomous driving system. Specially, the miniaturization of the sensors leads to compel the miniaturization of the fixer structures. In the viewpoint of the miniaturization, metallic structure is a best solution to attach the small IoT sensors to the main body. However, it is hard to manufacture the small metallic structure with a conventional machining process or manufacturing cost greatly increases. As one of solutions for the problems, in this work, metallic FDM (Fused depositon modeling) based on metallic filament was proposed and the FDM process was investigated to fabricate the small metallic structure. Final part was obtained by the post-process that consists of debinding and sintering. In this work, the relationship between infill rate and the density of the part after the post-process was investigated. The investigation of the relationship is based on the fact that the infill rate and the density obtained from the post-processing is not same. It can be said that this work is a fundamental research to obtain the higher density of the printed part.

Lightweight Authentication and Key Exchange Protocol Design for a Sensor Device in the Environment IoT (IoT 환경에서 소형 센서 디바이스를 위한 경량화 인증 및 키 교환 프로토콜 설계)

  • Lee, Jaeseung;Kang, Jungho
    • Proceedings of the Korea Information Processing Society Conference
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    • pp.1011-1012
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    • 2016
  • 최근 무선 통신 기술과 센서 디바이스들의 발달로 센서 기반 IoT 환경이 다양한 분야에 활용되고 있다. 하지만, IoT 환경을 구성하는 센서 노드가 소형 하드웨어로 구성되어 있어 메모리, 처리능력, 에너지 등에서 많은 제약사항을 가지고 있다. 따라서, 본 논문에서는 키 없는 해시 함수를 이용하여 센서 노드간 인증 및 키 교환을 경량화 기법을 제안한다. 제안하는 시스템은 숲이나 군사지역 등 사람이 접근하기 어려운 곳에 활용되는 센서 노드들의 배터리 수명을 향상시켜 효율적이고 지속적인 데이터 수집이 가능할 것으로 기대된다.

A Study for the Mechanical Properties with Infill Rate in FDM Process to Fabricate the Small IoT Device (소형 IoT 기기 제작을 위한 FDM 프린팅 공정에서의 내부채움에 따른 물성치 변화 연구)

  • Ahn, Il-Hyuk
    • Journal of The Korea Internet of Things Society
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    • v.6 no.3
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    • pp.75-80
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    • 2020
  • Recently, the size of the IoT sensor has been decreased and the collecting direction of the IoT sensor for acquiring the data have been changed from 2D to 3D. It makes sensor structure complex. In the fabrication of the complex structure, 3D printing technology has more useful than traditional manufacturing technologies. Among 3D printing technologies, FDM (fused deposition modeling) is a candidate technology to fabricate a small IoT sensor because the price of the machine and the material is cheap. In the FDM process, a 3D shape is made by depositing the melted filament. Recently, the patent of FDM technology is expired and cheat machines are developed based on the open-source. In the FDM process, mechanical properties of a fabricated part is affected by a lots of factors such as the kind of material and process parameters. Among them, infill is affecting the mechanical properties and the production lead time as well. In this work, a new method to optimize the FDM process with the consideration of mechanical property and production lead time was proposed. To verify the method, the fabrications were performed with the different infill rates. The results of tensile tests were analyzed to verify the proposed method.

Lightweight Authentication Method Considering Resource Efficiency in Sensor Based IoT Environment (센서 기반 IoT 환경에서 자원 효율성을 고려한 경량화 인증 기법)

  • Lee, Jaeseung;Jun, Moon-Soeg;Kang, Jungho
    • Proceedings of the Korea Information Processing Society Conference
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    • pp.480-482
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    • 2017
  • 최근 무선 통신 기술과 센서 디바이스들의 발달로 센서 기반 IoT 환경이 다양한 분야에 활용되고 있다. 하지만, 센서 네트워크 환경을 구성하는 센서 노드는 대부분 소형 하드웨어로 구성되어 있어 메모리, 처리능력, 에너지 등에서 많은 제약사항을 가지고 있다. 또한, 이기종 센서간의 통신 절차도 필요하다. 따라서, 본 논문에서는 DisTance-Bounding 프로토콜과 해시 함수를 이용하여 센서 노드간 인증 및 키 교환을 경량화 기법을 제안한다. 제안하는 시스템은 숲이나 군사지역 등 사람이 접근하기 어려운 곳에 활용되는 센서 노드들의 배터리 수명을 향상시켜 효율적이고 지속적인 데이터 수집이 가능할 것으로 기대된다.

Development of an IoT-Based Small Wearable System for Gait Analysis (걸음걸이 분석을 위한 IoT 기반의 소형 웨어러블 시스템 개발)

  • Kim, Hyeongseok;Lee, Woon Hyun;Kim, Si Moon;Yeom, Myeonggil;Kim, Jeongchang
    • Proceedings of the Korean Society of Broadcast Engineers Conference
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    • pp.38-40
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    • 2017
  • 본 논문에서는 사람의 걸음걸이 분석을 위한 소형 웨어러블 시스템을 개발한다. 신발 내 깔창에 부착 가능한 소형화된 모듈을 설계하고, 압력 센서 및 가속도 센서를 이용하여 사용자의 걸음걸이에 대한 정보를 측정하고 측정 데이터를 바탕으로 사용자의 자세를 분석한다. 분석한 결과는 블루투스 통신을 이용하여 사용자의 스마트폰으로 전송이 가능하고, 사용자는 자신의 걸음걸이에 대한 정보를 실시간으로 확인하여 스스로 자세교정을 할 수 있도록 유도한다.

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The research on Diffie-Hellman-based IoT Sensor Node key management (Diffie-Hellman 기반 사물인터넷 센서노드 키 관리 연구)

  • Hong, Sunghyuck;Yu, Jina
    • Journal of the Korea Convergence Society
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    • v.8 no.12
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    • pp.9-14
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    • 2017
  • Recently, the Internet of Things are developing in accordance with the technology of implementation in low-cost, small-size, low power consumption and smart sensor that can communicate using the internet. Especially, key management researches for secure information transmission based on the Internet of Things (IoT) are actively performing. But, Internet of Things(IoT) are uses sensor. Therefore low-power consumption and small-memory are restrictive condition. As a result, managing the key is difficult as a general security measure. However, The problem of secure key management is an essential challenge For the continuous development of the Internet of things. In this paper, we propose a key distribution and management technique in secure Internet of things. In the key generation and management stage, it satisfies the conditions and without physically constrained for IoT based communication.

A Study on Lightweight Block Cryptographic Algorithm Applicable to IoT Environment (IoT 환경에 적용 가능한 경량화 블록 암호알고리즘에 관한 연구)

  • Lee, Seon-Keun
    • Journal of the Korea Academia-Industrial cooperation Society
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    • v.19 no.3
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    • pp.1-7
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    • 2018
  • The IoT environment provides an infinite variety of services using many different devices and networks. The development of the IoT environment is directly proportional to the level of security that can be provided. In some ways, lightweight cryptography is suitable for IoT environments, because it provides security, higher throughput, low power consumption and compactness. However, it has the limitation that it must form a new cryptosystem and be used within a limited resource range. Therefore, it is not the best solution for the IoT environment that requires diversification. Therefore, in order to overcome these disadvantages, this paper proposes a method suitable for the IoT environment, while using the existing block cipher algorithm, viz. the lightweight cipher algorithm, and keeping the existing system (viz. the sensing part and the server) almost unchanged. The proposed BCL architecture can perform encryption for various sensor devices in existing wire/wireless USNs (using) lightweight encryption. The proposed BCL architecture includes a pre/post-processing part in the existing block cipher algorithm, which allows various scattered devices to operate in a daisy chain network environment. This characteristic is optimal for the information security of distributed sensor systems and does not affect the neighboring network environment, even if hacking and cracking occur. Therefore, the BCL architecture proposed in the IoT environment can provide an optimal solution for the diversified IoT environment, because the existing block cryptographic algorithm, viz. the lightweight cryptographic algorithm, can be used.

Design of IoT Education System based on Sensor Data (센서 데이터 기반 사물인터넷 교육 시스템 설계)

  • Kim, Boon-Hee
    • Proceedings of the Korean Society of Computer Information Conference
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    • pp.187-188
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    • 2018
  • 컴퓨터 기기들이 소형화되고 주변 생활 기기로 융합되면서 사물인터넷 기술에 적합한 형태로 발전하고 있다. 사물인터넷 기술은 기존 컴퓨터에 비해 다루기 쉬운 형태로 되어 있어 생활 환경에서 사용되는 다양한 형태로 발전하고 있다. 베란다에서 키우는 화분에 사물인터넷 기술을 도입하기도 하고, 냉장고, TV, 보일러와 같은 다양한 기기에 사물인터넷 기술이 추가되기도 한다. 이러한 기능들은 사람들의 생활 환경을 자동화하는데 일조하고 있다. 사물인터넷 기술에서 가장 많이 활용되는 부품은 센서라할 수 있는데, 빛, 온도, 압력 등을 감지할 수 있어 활용도가 높다. 센서 기반 사물인터넷 기술은 우리의 생활에 속속 들어오고 있는데, 아직까지 교육 시스템에 도입되는 경우는 드문 현실이다. 본 연구에서는 센서 데이터 기반 사물인터넷 기술을 교육 시스템에 도입하고자 활용 방안을 제안하고자 한다.

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Design of a 6-Axis Inertial Sensor IC for Accurate Location and Position Recognition of M2M/IoT Devices (M2M / IoT 디바이스의 정밀 위치와 자세 인식을 위한 6축 관성 센서 IC 설계)

  • Kim, Chang Hyun;Chung, Jong-Moon
    • The Journal of Korean Institute of Communications and Information Sciences
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    • v.39C no.1
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    • pp.82-89
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    • 2014
  • Recently, inertial sensors are popularly used for the location and position recognition of small devices for M2M/IoT. In this paper, we designed low power, low noise, small sized 6-axis inertial sensor IC for mobile applications, which uses a 3-axis piezo-electric gyroscope sensor and a 3-axis piezo-resistive accelerometer sensor. Proposed IC is composed of 3-axis gyroscope readout circuit, two gyroscope sensor driving circuits, 3-axis accelerometer readout circuit, 16bit sigma-delta ADC, digital filter and control circuit and memory. TSMC $0.18{\mu}m$ mixed signal CMOS process was used. Proposed IC reduces 27% of the current consumption of LSM330.

Modeling and Calibration of Wrist Magnetic Sensor for Measuring Wrist Gesture (손목운동 측정을 위한 손목 자기장 센서의 모델링 및 캘리브레이션)

  • Yeo, Hee-Joo
    • Journal of the Korea Academia-Industrial cooperation Society
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    • v.21 no.4
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    • pp.26-32
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    • 2020
  • Recently, as various wearable devices and IoT technologies have emerged and been applied to real applications, various sensors have been developed to satisfy their purposes and applied. In even In medical applications, IoT technologies have been applied gradually, and particularly, magnets and magnetic sensors have already been playing an important role in the medical industry. In wrist rehabilitation, this kind of sensor technology has enabled us to easily and conveniently measure wrist movement and gestures because there are no tangled lines required between the magnet and sensor. However, one of the drawbacks is that nonlinear output is generated because of the characteristics of a magnetic field. Also, the movement of the wrist joint involves small bones, and so it is not easy to simply model the movement. In order to resolve these issues and accurately measure sensor data, a calibration procedure is inevitable in the measurement. Thus, this paper proposes a practical model and simple calibration methods for measuring the distance between a magnet and a magnetic sensor.