• Electronics and Telecommunications Trends
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• v.15 no.6 s.66
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• pp.56-64
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• 2000

홈 네트워크의 표준화를 추진하는 분야활동은 크게 매체에 의해서 유/무선으로 구분될 수 있다. 여기서 소개하는 이외에도 홈 네트워크를 목표로 하는 활동분야는 많지만 여기서는 최근 활동이 활발한 분야인 TA1394/HAVi, USB2, Home PNA, 전력선 통신, 무선 1394, Home RF-WG, 블루투스, IrDA의 표준화 단체를 중심으로 국내외 표준 규격화 동향에 대하여 기술한다.

• The Transactions of The Korean Institute of Electrical Engineers
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• v.65 no.1
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• pp.122-127
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• 2016

In this paper, new spectrum sensing schemes based on analog/RF front-end processing are introduced for IoT wireless sensor networks. While the conventional approaches for wireless channel cognition have been issued in signal processing area, the RF spectrum cognition concept makes it feasible to achieve cognitive wireless sensor networks (C-WSNs). The spectrum cognition at RF processing is categorized as four kinds of sensing mechanisms. Two recent reseaches are described as promising candidates for the C-WSN. One senses spectrum by the frequency discriminating receiver, the other senses and detects from the frequency selective super-regenerative receiver. The introduced systems with simple and low-power RF architectures play dual roles of channel sensing and demodulation. simultaneously. Therefore, introduced spectrum sensing receivers can be one of the best candidates for IoT wireless sensor devices in C-WSN environments.

• Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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• v.9 no.1
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• pp.539-542
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• 2005

In this paper, we propose a wireless data access system, which used direct sequence spread spectrum method and the ISM band with 900MHz radio frequency. By applying bi-directional transmission between wireless transmitter and receiver, it can be effectively connected with any kinds of RF-ID with 900MHz ISM band. Therefore it could economically be used as peripheral equipments for RF-ID system.

• Journal of the Korea Institute of Information and Communication Engineering
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• v.25 no.9
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• pp.1271-1274
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• 2021

RF fingerprinting based on deep learning (DL) has gained interests as a means to improve the security of near field communication (NFC) by allowing identification of NFC tags based on unique physical characteristics. To achieve high accuracy in the identification of NFC tags, it is crucial to utilize a large number of training data, however it is hard to collect such dataset in practice. In this study, we have provided new methodology to generate RF waveform from NFC tags, i.e., data augmentation, based on a conditional generative adversarial network (CGAN). By using the RF waveform of NFC tags which is collected from the testbed with software defined radio (SDR), we have confirmed that the realistic RF waveform can be generated through our proposed scheme.

• Information and Communications Magazine
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• v.26 no.5
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• pp.3-9
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• 2009

본 고에서는 현재 IEEE 802.15.7 TG VLC에서 본격적으로 논의되고 있는 가시광 무선통신의 응용 서비스 모델 중에서 LED(Light Emitting Diode) 조명과 통신이 융합된 응용 서비스 모델을 중심으로 알아본다. LED를 이용한 통신 기술은 광 케이블을 이용한 유선 광통신에서 이미 시작된 기술이나 LD를 이용하여 더 우수한 성능을 보이면서 잊혀져가던 기술중하나이다. 이러한 광통신 기술은 LED의 성능이 급격하게 증가하면서 다시금 주목을 받게 되었고, 특히 LED를 이용한 조명기술이 발전하면서 무선통신으로 다시금 주목받고 있는 기술이다. 실내 환경에서 LED 조명 고유의 기능을 그대로 유지하면서 무선통신을 가능하게 하고, 항공기 혹은 병원내에서와 같이 기존의 RF무선통신에 제약을 받는 환경에서도 무선통신이 가능하게 하며, 실내 LED 조명을 이용함으로써 국부지역에 특정 서비스 제공이 가능해 졌다. 따라서 가시광 무선통신은 조명산업과의 융합을 통해 통신뿐만 아니라 기존의 조명과 디스플레이 분야에서 새로운 가치를 창출 할 수 있는 그린 IT융합 기술이다. 본 고에서는 LED조명의 등장배경, 위치 정보 제공 서비스, 국부 방송 서비스, 항공기내 무선통신 서비스 등 LED 조명 기술과 통신기술이 융합된 가시광 무선통신의 응용 서비스 모델에 대하여 설명한다.

• Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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• 2012.05a
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• pp.896-898
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• 2012

Recently, many countries are making efforts for the development of ocean resources because the necessity and importance of the ocean resources are increased. Underwater sensor networks have emerged as a very powerful technique for many applications, including monitoring, measurement, surveillance and control and envisioned to enable applications for oceanographic data collection, ocean sampling, environmental and pollution monitoring, offshore exploration, disaster prevention, tsunami and seaquake warning, assisted navigation, distributed tactical surveillance, and mine reconnaissance. The idea of applying sensor networks into underwater environments (i.e., forming underwater sensor networks) has received increasing interests in monitoring aquatic environments for scientific, environmental, commercial, safety, and military reasons. The data obtained by observing around the environment are wireless-transmitted by a radio set with various waves. According to the technical development of the medium set, some parameters restricted in observing the ocean have been gradually developed with the solution of power, distance, and corrosion and watertight by the seawater. The actual matters such as variety of required data, real-time observation, and data transmission, however, have not enough been improved just as various telecommunication systems on the land. In this paper, a wireless management system will be studied through a setup of wireless network available at fishery around the coast, real-time environmental observation with RF sensor, and data collection by a sensing device at the coastal areas.

• The Journal of the Korea institute of electronic communication sciences
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• v.10 no.6
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• pp.749-756
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• 2015

In this paper, we propose a unique systolic structure and communication algorithm that maintains a solid link between nodes using synchronous digital communication and enables low power communication. This system was designed by using CC2500 RF transceiver, CC2590 RF front end and C8051F330 low power microcontroller. The measurement of power consumption in the network link shows below $400{\mu}W$ in data transfer rate 320bps. The system constitutes the base unit of low power wireless network that was composed of each seven link nodes having eight sensor nodes. Results of the experiments show that link nodes using a 4Ah battery could operate over 3 years without replacement.

• Journal of Advanced Marine Engineering and Technology
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• v.39 no.1
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• pp.52-57
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• 2015

In this paper, we studies on the RF characteristics of the transmission line employing IPACD (inverted periodically arrayed capacitive devices) on MMIC (monolithic microwave integrated circuit) for application to wireless communication system. According to measured results, the novel transmission line employing IPACD showed a wavelength much shorter than conventional transmission lines. In addition, the IPACD structure showed an effective permittivity much higher than conventional ones. We also extracted the bandwidth characteristic of the IPACD structure using equivalent circuit analysis. According to the results, the cut-off frequency of the proposed structure was 129.2 GHz.

• Journal of the Korea Institute of Information and Communication Engineering
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• v.23 no.7
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• pp.807-815
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• 2019

In this paper, we design a power amplifier to support quad-band in wireless communication devices using RF CMOS 180-nm process. The proposed power amplifier consists of low-band 0.9, 1.8, and 2.4 GHz and high-band 5 GHz. We proposed a structure that can support each input matching network without using a switch. For maximum linear output power, the output matching network was designed for impedance conversion to the power matching point. The fabricated quad-band power amplifier was verified using modulation signals. The long-term evolution(LTE) 10 MHz modulated signal was used for 0.9 and 1.8 GHz, and the measured output power is 23.55 and 24.23 dBm, respectively. The LTE 20 MHz modulated signal was used for 1.8 GHz, and the measured output power is 22.24 dBm. The wireless local area network(WLAN) 802.11n modulated signal was used for 2.4 GHz and 5.0 GHz. We obtain maximum linear output power of 20.58 dBm at 2.4 GHz and 17.7 dBm at 5.0 GHz.

• Journal of the Korean Society of Surveying, Geodesy, Photogrammetry and Cartography
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• v.23 no.4
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• pp.409-417
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• 2005

This study is aimed to develop a remote control robot-ship system using wireless communication and DGPS, which it is an automatic system for measuring exact depth and bed topography of reservoir or dam. Robot-ship is equipped with GPS and echosounder, and it is controled remotely using wireless internet. Robot-ship is consist of frame, each module and control board. Control segment is consisted of a processing system for positioning data and remote control system. A wireless communication system is developed which can communicate interactively between robot-ship and control segment, and it is developed in two channel system of RF modem and wireless internet. The robot-ship could be used acquire economically and exactly the water depth and bed topography of reservoirs, dams, rivers and so on.