• Title, Summary, Keyword: Convergence of Sensor

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Design and Implementation of Bird Repellent System (조류 퇴치 시스템의 설계 및 구현)

  • Hong, Hyunggil;Cho, Yongjun;Woo, Senongyong;Song, Suhwan;Oh, Jangseok;Yun, Haeyong;Kim, Dae Hee
    • Journal of the Korean Society of Manufacturing Process Engineers
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    • v.18 no.8
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    • pp.104-109
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    • 2019
  • Damage caused by wild animals such as pheasants and magpies is a problem in rural areas. A bird repellent system based on sensing and repelling farm pest animals and birds is proposed herein. This system is equipped with a bird model part on a supporting platform and comprises a sound source generator, a system control user interface, and a sensor in the center. The sensor is composed of an illuminance sensor and a PIR sensor. The illuminance sensor distinguishes between day and night, whereas the PIR sensor detects birds or wild animals and outputs them from the sound generator. The entire system can be managed easily by the user interface and system control.

Realization of Object Detection Algorithm and Eight-channel LiDAR sensor for Autonomous Vehicles (자율주행자동차를 위한 8채널 LiDAR 센서 및 객체 검출 알고리즘의 구현)

  • Kim, Ju-Young;Woo, Seong Tak;Yoo, Jong-Ho;Park, Young-Bin;Lee, Joong-Hee;Cho, Hyun-Chang;Choi, Hyun-Yong
    • Journal of Sensor Science and Technology
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    • v.28 no.3
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    • pp.157-163
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    • 2019
  • The LiDAR sensor, which is widely regarded as one of the most important sensors, has recently undergone active commercialization owing to the significant growth in the production of ADAS and autonomous vehicle components. The LiDAR sensor technology involves radiating a laser beam at a particular angle and acquiring a three-dimensional image by measuring the lapsed time of the laser beam that has returned after being reflected. The LiDAR sensor has been incorporated and utilized in various devices such as drones and robots. This study focuses on object detection and recognition by employing sensor fusion. Object detection and recognition can be executed as a single function by incorporating sensors capable of recognition, such as image sensors, optical sensors, and propagation sensors. However, a single sensor has limitations with respect to object detection and recognition, and such limitations can be overcome by employing multiple sensors. In this paper, the performance of an eight-channel scanning LiDAR was evaluated and an object detection algorithm based on it was implemented. Furthermore, object detection characteristics during daytime and nighttime in a real road environment were verified. Obtained experimental results corroborate that an excellent detection performance of 92.87% can be achieved.

Environmental Monitoring Sub-System for Ubiquitous Terminal Using Metal Oxide Nano-Material Gas Sensor (나노 금속산화물을 이용한 유단말용 환경 모니터링 서브 시스템)

  • Moon, S.E.;Lee, H.Y.;Lee, J.W.;Park, J.;Park, S.J.;Kwak, J.H.;Maeng, S.;Park, K.H;Kim, J.;Udrea, F.;Milne, W.I.
    • Proceedings of the Korean Institute of Electrical and Electronic Material Engineers Conference
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    • pp.63-63
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    • 2008
  • Environmental monitoring sub-system has been developed using gas sensor module, Bluetooth module and PDA phone. The gas sensor module consists of $NO_2or$ CO gas sensor and signal processing chips. Gas sensor is composed of the micro-heater, sensing electrode and sensing material. Metal oxide nano-material was selectively deposited on a substrate with micro-heater and was integrated to the gas sensor module. The change in resistance of the metal oxide nano-material due to exposure of oxidizing or deoxidizing gases is utilized as the principle of this gas sensor operation mechanism. This variation detected in the gas sensor module was transferred to the PDA phone by way of Bluetooth module.

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1.5 V Sub-mW CMOS Interface Circuit for Capacitive Sensor Applications in Ubiquitous Sensor Networks

  • Lee, Sung-Sik;Lee, Ah-Ra;Je, Chang-Han;Lee, Myung-Lae;Hwang, Gunn;Choi, Chang-Auck
    • ETRI Journal
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    • v.30 no.5
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    • pp.644-652
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    • 2008
  • In this paper, a low-power CMOS interface circuit is designed and demonstrated for capacitive sensor applications, which is implemented using a standard 0.35-${\mu}m$ CMOS logic technology. To achieve low-power performance, the low-voltage capacitance-to-pulse-width converter based on a self-reset operation at a supply voltage of 1.5 V is designed and incorporated into a new interface circuit. Moreover, the external pulse signal for the reset operation is made unnecessary by the employment of the self-reset operation. At a low supply voltage of 1.5 V, the new circuit requires a total power consumption of 0.47 mW with ultra-low power dissipation of 157 ${\mu}W$ of the interface-circuit core. These results demonstrate that the new interface circuit with self-reset operation successfully reduces power consumption. In addition, a prototype wireless sensor-module with the proposed circuit is successfully implemented for practical applications. Consequently, the new CMOS interface circuit can be used for the sensor applications in ubiquitous sensor networks, where low-power performance is essential.

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COSMOS: A Middleware for Integrated Data Processing over Heterogeneous Sensor Networks

  • Kim, Ma-Rie;Lee, Jun-Wook;Lee, Yong-Joon;Ryou, Jae-Cheol
    • ETRI Journal
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    • v.30 no.5
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    • pp.696-706
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    • 2008
  • With the increasing need for intelligent environment monitoring applications and the decreasing cost of manufacturing sensor devices, it is likely that a wide variety of sensor networks will be deployed in the near future. In this environment, the way to access heterogeneous sensor networks and the way to integrate various sensor data are very important. This paper proposes the common system for middleware of sensor networks (COSMOS), which provides integrated data processing over multiple heterogeneous sensor networks based on sensor network abstraction called the sensor network common interface. Specifically, this paper introduces the sensor network common interface which defines a standardized communication protocol and message formats used between the COSMOS and sensor networks.

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SOI CMOS-Based Smart Gas Sensor System for Ubiquitous Sensor Networks

  • Maeng, Sung-Lyul;Guha, Prasanta;Udrea, Florin;Ali, Syed Z.;Santra, Sumita;Gardner, Julian;Park, Jong-Hyurk;Kim, Sang-Hyeob;Moon, Seung-Eon;Park, Kang-Ho;Kim, Jong-Dae;Choi, Young-Jin;Milne, William I.
    • ETRI Journal
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    • v.30 no.4
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    • pp.516-525
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    • 2008
  • This paper proposes a compact, energy-efficient, and smart gas sensor platform technology for ubiquitous sensor network (USN) applications. The compact design of the platform is realized by employing silicon-on-insulator (SOI) technology. The sensing element is fully integrated with SOI CMOS circuits for signal processing and communication. Also, the micro-hotplate operates at high temperatures with extremely low power consumption, which is important for USN applications. ZnO nanowires are synthesized onto the micro-hotplate by a simple hydrothermal process and are patterned by a lift-off to form the gas sensor. The sensor was operated at $200^{\circ}C$ and showed a good response to 100 ppb $NO_2$ gas.

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Intelligent Sensor Technology Trend for Smart IT Convergence Platform (스마트 IT 융합 플랫폼을 위한 지능형 센서 기술 동향)

  • Kim, H.J.;Jin, H.B.;Youm, W.S.;Kim, Y.G.;Park, K.H.
    • Electronics and Telecommunications Trends
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    • v.34 no.5
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    • pp.14-25
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    • 2019
  • As the Internet of Things, artificial intelligence and big data have received a lot of attention as key growth engines in the era of the fourth industrial revolution, data acquisition and utilization in mobile, automotive, robotics, manufacturing, agriculture, health care and national defense are becoming more important. Due to numerous data-based industrial changes, demand for sensor technologies is exploding, especially for intelligent sensor technologies that combine control, judgement, storage and communication functions with the sensors's own functions. Intelligent sensor technology can be defined as a convergence component technology that combines intelligent sensor units, intelligent algorithms, modules with signal processing circuits, and integrated plaform technologies. Intelligent sensor technology, which can be applied to variety of smart IT convergence services such as smart devices, smart homes, smart cars, smart factory, smart cities, and others, is evolving towards intelligent and convergence technologies that produce new high-value information through recognition, reasoning, and judgement based on artificial intelligence. As a result, development of intelligent sensor units is accelerating with strategies for miniaturization, low-power consumption and convergence, new form factor such as flexible and stretchable form, and integration of high-resolution sensor arrays. In the future, these intelligent sensor technologies will lead explosive sensor industries in the era of data-based artificial intelligence and will greatly contribute to enhancing nation's competitiveness in the global sensor market. In this report, we analyze and summarize the recent trends in intelligent sensor technologies, especially those for four core technologies.

Sub-ppm level MEMS gas sensor (서브 피피엠 레벨 미세기전 가스 센서)

  • Ko, Sang-Choon;Jun, Chi-Hoon;Song, Hyun-Woo;Park, Seon-Hee
    • Journal of Sensor Science and Technology
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    • v.17 no.3
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    • pp.183-187
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    • 2008
  • A sub-ppm level MEMS gas sensor that can be used for the detection of formaldehyde (HCHO) is presented. It is realized by using a zinc oxide (ZnO) thin-film material with a Ni-seed layer as a sensing material and by bulk micromachining technology. To enhance sensitivity of the MEMS gas sensor with Ni-seed layer was embedded with ZnO sensing material and sensing electrodes. As experimental results, the changed sensor resistance ratio for HCHO gas was 9.65 % for 10 ppb, 18.06 % for 100 ppb, and 35.7 % for 1 ppm, respectively. In addition, the minimum detection level of the fabricated MEMS gas sensor was 10 ppb for the HCHO gas. And the measured output voltage was about 0.94 V for 10 ppb HCHO gas concentration. The noise level of the fabricated MEMS gas sensor was about 50 mV. The response and recovery times were 3 and 5 min, respectively. The consumption power of the Pt micro-heater under sensor testing was 184 mW and its operating temperature was $400^{\circ}C$.

Designing and Manufacturing Technology of Sensor Node for Machine Tools (공작기계용 센서노드 설계 및 제작기술)

  • Jang, D.Y.;Kwon, O.S.;Park, M.J.;Kim, S.J.
    • Journal of the Korean Society for Precision Engineering
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    • v.31 no.7
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    • pp.569-576
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    • 2014
  • Sensor node means a device to include sensor, amplifier, and data acquisition (DAQ) equipment. The sensor converts physical signals to electric signals and weak signals from the sensor can be amplified through the amplifier. DAQ equipment converts analog signal to digital signal and collects converted digital signal. Since the sensor node is sensitive to the environment so that selection of mounting position and fixture design of sensor are applied differently depending on the characteristics of a target. This study is about designing and manufacturing sensor node to be used in a machine tool. The environment of machine tool is very severe due to noise, temperature fluctuation, and dust, etc. Hence, the sensor and amplifier must be designed and manufactured by considering the environmental issues. The designed and manufactured sensor node was tested for the reliability and effectiveness of the developed sensor nodes in the study.

Development of Underground Displacement and Convergence Auto-Measuring Program for the Tunnel Using the Fiber Optic Sensor (광섬유 센서를 이용한 터널 지중 및 내공변위 자동계측 프로그램 개발)

  • Choi, Myong-Ho;Yoon, Ji-Son;Kwon, Oh-Duk;Kwon, Oh-Jun
    • Proceedings of the Korean Geotechical Society Conference
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    • pp.1361-1368
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    • 2005
  • In this paper, the theoretical method of measuring the tunnel convergence and underground displacement, the objective indices of assessing safety for tunnel construction, using the fiber optic sensor is studied by developing the program to automatically measure them. The model test of Con'c beam is conducted to evaluate reliability of the fiber optic sensor. Furthermore, using the RS232 communication protocol as well as Visual C# and Visual C++, the programming tools, the program was developed to detect automatically the measured value of the fiber optic sensor, calculate the tunnel convergence and underground displacement, predict the deformed shape of the tunnel, and evaluate loosening zone due to the tunnel excavation.

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