• Title/Summary/Keyword: 무선트랜스미터

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Petrochemical Plant Safety Management System based on Wireless Transmitter (무선 트랜스미터 기반의 석유화학 플랜트 안전관리 시스템)

  • Kang, Sung-Min;Park, Soo-Yeol;Yeo, Keum-Soo;Park, Jae-Woo
    • Journal of the Korea institute for structural maintenance and inspection
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    • v.19 no.6
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    • pp.88-94
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    • 2015
  • Large-scale petrochemical and power plants has increased demanting wireless technology for continuous monitoring. However, the current USN technologies, such as ZigBee and Bluetooth, are lackof reliability and security. Therefore, there is a strong need to apply a new wireless technology standard of the ISA. In this study, a petrochemicalplant safety management system based on the ISA wireless transmitter isdeveloped. ISA100.11a communication module and LTE communication module equippedwith an explosion-proof wireless transmitter are developed. A petrochemicalplant safety management system is built based on the IoT technologies. Thedeveloped system is verified through a wide range of testing and thus, on-siteapplicability is proved.

A Study on MPEG-4 Transmission Characteristics for Video Transcoder in Wireless Network (비디오 트랜스코더를 위한 무선망에서의 MPEG-4 전송 특성에 관한 연구)

  • Jung Hyedong;Ham Kyungsun;Ko Jaejin;Kim Jewoo
    • Proceedings of the Korean Society of Broadcast Engineers Conference
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    • 2003.11a
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    • pp.139-142
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    • 2003
  • 무선 네트워크에서 멀티미디어 전송을 위해 Delay를 줄이는 방법을 연구하고 이에 대한 실험적 검증을 하였다. 멀티미디어 데이터는 그 특성상 주어진 시간에 도착하지 못하는 데이터는 손실로 간주되므로 Loss에 못지 않게 Delay가 중요한 QoS 파라미터가 된다. 본 연구에서는 IEEE 802.11b를 그 환경으로 하여 멀티미디어 데이터를 트랜스코더를 이용하여 미디어 전환 후 전송 학 때 Delay를 최소화 할 수 있는 방안을 연구하였다. 무선 환경에서의 SNR을 기준으로 다양한 조건에서 패킷 사이즈와 전송 간격을 조절하여 무선 네트워크에서 Delay와 Loss가 적게 발생하는 환경을 찾아내었으며 이전 상태와 현재 상태를 비교하여 미래의 상태를 미리 예측학 수 있는 알고리즘을 개발하여 적용하였다. 이러한 연구 결과는 MPEG-4의 Video racket을 가장 효율적인 크기로 인코딩 할 수 있는 판단 근거를 만들게 해 주며, 예측 된 패킷 사이즈를 통하여 다음 전송이 이루어지기 전에 트랜스코더에게 미리 인코딩 하여 준비학 수 있도록 해서 네트워크에 적응적인 전송 방식으로 구현될 수 있는 장점이 있다.

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Circuit Model Based Analysis of a Wireless Energy Transfer System via Coupled Magnetic Resonances (결합된 자기공명을 통한 무선에너지 전력 전송 시스템의 회로 해석)

  • Cheon, Sang-Hoon;Kim, Yong-Hae;Lee, Myung-Lae;Kang, Seung-Youl
    • The Transactions of the Korean Institute of Power Electronics
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    • v.16 no.2
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    • pp.137-144
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    • 2011
  • A Simple equivalent circuit model is developed for a wireless energy transfer system via coupled magnetic resonances and a practical design method is also provided. Node equations for the resonance system are built with the method, expanding on the equations for a transformer, and the optimum distances of coils in the system are derived analytically for optimum coupling coefficients for high transfer efficiency. In order to calculate the frequency characteristics for a lossy system, the equivalent model is established at an electric design automation tool. The model parameters of the actual system are extracted and the modeling results are compared with measurements. Through the developed model, it is seen that the system can transfer power over a mid-range of a few meters and impedance matching is important to achieve high efficiency. This developed model can be used for a design and prediction on the similar systems such as increasing the number of receiving coils and receiving modules, etc.

A Study on the Design of Smart Clothing for Vital sign Monitoring -Based on ECG Sensing Clothing- (생체신호 모니터링 스마트 의류의 디자인 연구 -심전도 센싱 의류를 중심으로-)

  • Jo, Ha-Gyeong;Jo, Hyeon-Seung;Gu, Su-Min;Song, Ha-Yeong;Gang, Da-Hye;Lee, Ju-Hyeon;Lee, Jeong-Hwan;Lee, Yeong-Jae
    • Proceedings of the Korean Society for Emotion and Sensibility Conference
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    • 2009.05a
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    • pp.123-126
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    • 2009
  • 최근 생체 신호 센싱 기능의 의류가 연구 개발되어 왔으나, 생체 신호 측정 시 착용자의 동작에 의한 치명적인 잡음이 발생하는 문제가 지속적으로 보고되어 왔다. 이에 본 연구는 심전도 센싱 의류를 기반으로 생체 신호 측정의 정확성을 향상시키기 위하여 착용자의 동작에 의한 영향을 최소화할 수 있는 심전도 센싱 스마트 의류의 모형을 개발하고자 하였다. '일자형 절개 타입', '십자형 절개 타입', '엑스형 절개 타입', '곡선 엑스형 절개 타입'의 총 네 가지 타입의 생체신호 센싱 스마트 의류의 시안을 설계하고 제작하였다. 디자인 시안은 민소매 형태의 남성용 티셔츠로 신축성 있는 소재를 사용하여 인체 굴곡을 따라 의복과 전극이 밀착될 수 있도록 하였으며, 트랜스미터를 이용하여 메인 컴퓨터로 데이터가 무선 전송되게 하였다. 본 연구에서는 개발된 4 가지 의류 타임을 기반으로 인체의 정지 및 동작 상태에서의 심전도 센싱 성능을 평가하기 위해 동작에 따른 전극의 변위를 측정하고, 심전도 측정 평가를 실시하여 SNR을 분석하였다. 본 실험 곁과를 반영하여 의류 디자인 시안의 수정 및 보완 과정을 거친 후, 최종적으로 동작 잡음을 최소화하는 생체신호 센싱 스마트 의류 디자인 모형을 제시하였다.

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Dynamic Vehicle Arbitration Algorithm on Multilane (다중 차선에서의 차량 우선 처리를 위한 동적 중재 알고리즘)

  • Jang, Myung-Deok;Yoo, Se-Keun;Kim, Yong-Deak
    • Journal of the Korean Institute of Telematics and Electronics S
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    • v.36S no.7
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    • pp.16-24
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    • 1999
  • This paper deals with the dynamic vehicle arbitration algorithm for communication between vehicles and a roadside control init on multilane environment. The suggested algorithm varies its parameter values according to the current vehicle arrival rate to get the maximum performance. To get the optimum parameter values, arbitration methods that use random delay counter and persist mechanism were taken into account and the performance of these methods with respect to the vehicle arrival rate was analyzed by computer simulation. After applying the optimum parameter values to suggested algorithm, it is shown that more enhanced reliability was acquired This algorithm could be applied to various systems which include the communication between a transponder and a control unit.

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Trackside to Train Communication Using Infrared System (적외선 시스템을 이용한 지상차상통신)

  • Sugiana, Ahmad;Sanyoto, Mulyo;Lee, Key Seo;Choy, Ick
    • The Journal of the Korea institute of electronic communication sciences
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    • v.11 no.8
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    • pp.743-750
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    • 2016
  • The conventional track to train communication is commonly using radio based equipment such as transponder or balise to transmit the data. However, there are some drawbacks of the conventional equipment, for example multipath fading, source of bandwidth limitation, and interference from other users. Moreover, the radio based equipment is very expensive when installed in large numbers. To address these problems, we propose infrared system for trackside to train communication system. Infrared system offers a transmission of data to train and it can be processed to obtain at least a train location. Infrared communication protocol provides practical wireless data communication for direct dedication configuration. Furthermore, on the pole configuration the infrared system provides an abundant bandwidth, an economically sensible, minimalized installation of equipment on the trackside and reliability for heavy rain environment. This paper concentrates on the communication function and measurement performance evaluation. The proposed trackside to train communication system covers about 6 meters between infrared receiver and infrared transmitter, whereas the half angle of the transmitter is set to $19.65^{\circ}$ and the receiver angle is $15^{\circ}$.

A Study on the Design of Functional Clothing for Vital sign Monitoring -Based on ECG Sensing Clothing- (생체신호 측정을 위한 기능성 의류의 디자인 연구 -심전도 센싱 의류를 중심으로-)

  • Cho, Ha-Kyung;Song, Ha-Young;Cho, Hyeon-Seong;Goo, Su-Min;Lee, Joo-Hyeon
    • Science of Emotion and Sensibility
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    • v.13 no.3
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    • pp.467-474
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    • 2010
  • Recently, Study of functional clothing for Vital sensing is focused on reducing artifact by human motions, in order to enhance the electrocardiogram(ECG) sensing accuracy. In this study, considering the factors for each element found from the analysis, a 3-lead electrode inside textile embroidered with silver yarn was developed, and draft designs off our types of vital-signal sensing garments, which are 'chest-belt typed' garment, 'cross-typed' garment 'x-typed' garment and 'curved x-typed' garment, were prepared. The draft designs were implemented on a sleeveless male shirt made of an elastic material so that the garment and the electrodes can remain closely attached along the contour of the human body, and the acquired data was sent to the main computer over a wireless network. In order to evaluate the effects caused by body movements and the ECG-sensing capability for each type in static and dynamic states, displacements were measured from one and two dimensional perspectives. ECG measurement evaluation was also performed for Signal-to-noise ratio(SNR) analysis. Applying the experimental results, the draft garment designs were modified and complemented to produce two types of modular approaches 'continuous-attached' and 'insertion-detached' for the ECG-sensing smart clothing.

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