• Journal of Convergence Society for SMB
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• v.6 no.4
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• pp.25-30
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• 2016

This paper presents on the development of a compact anti-lost device requested recently. The proposed device consists of the master and slave modules based on Bluetooth4.1 technology. To implement a low-power characteristic, an algorithm has been also developed. The transmitting and receiving circuits are designed by using BoT CLE110 module supporting Bluetooth 4.1. The ATmega 328P-AU was used for the control and LP3874EMP was used as a linear regulator. Power consumption of the fabricated product in operating mode is only 10mAh and 35mAh for MCU operating state. Alarm operation distance is $10m{\pm}30%$, the effective radiated power is less than 10mW, the frequency band is designed to operate in the Bluetooth band with 26MHz bandwidth. And algorithms have been developed to extend the battery life. The size of the product was obtained as $45{\times}45{\times}15mm$ for master and $35{\times}35{\times}10mm$ fr slave. After the optimization process, it is expected to be commercialized as a wristwatch for anti-lost device.

• Proceedings of the KIPE Conference
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• 2013.07a
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• pp.173-174
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• 2013

전기장만으로 에너지를 전송하는 전계결합형 비접촉 충전기술은 송수신부를 매개하는 AC링크를 구성하는 전극쌍의 정전용량확보에 한계가 있으므로, 이를 잘 활용하기 위한 송수신회로가 요구된다. 따라서 본 논문에서는 이를 감안하여 전계결합형 에너지전송에 적합한 매칭변압기를 사용한 E급 송수신회로 구조를 제안한다. 제안된 구조에서 AC-링크 캐패시터의 낮은 정전용량을 감안한 최적 설계방식을 제안하고 회로설계에 따른 성능을 모의실험을 통해 예측한다.

• Journal of Digital Contents Society
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• v.17 no.3
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• pp.173-180
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• 2016

In this paper, a design of transceiver module for real-time wire and wireless robust integrated security system to solve the problem of conventional security system and its transceiver module is proposed. The presented robust integrated security system is designed with RF control unit and wireless transceiver module. A RF controller in transceiver module works as a low-power RF transceiver system. It is designed to use specific bandwidth stored in registers and manipulate RF power of transceiver by accessing the random values of registers. Operation algorithm for RF transceiver module is also presented. The designed transceiver module and the operation algorithm are implemented and verified by experiments.

• Journal of the Institute of Electronics Engineers of Korea TC
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• v.46 no.2
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• pp.60-65
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• 2009

A highly reliable Video Transmission System (VTS) was developed in order to obtain both video and digital data simultaneously in the real time flight test situation of a flying vehicle. The VTS integrates GPS date digital telemetry data and video signals into a compact digital data package which is compressed and processed by an MPEG-2 Encoder and a modulator respectively. The modulator is composed of a specially devised Forward Error Correction processor and base band QPSK modulator. The designed VTS was verified and proved for its required functioning and performance through separate flight tests using an airplane and Rockets.

• The Journal of Korean Institute of Communications and Information Sciences
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• v.26 no.5A
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• pp.879-888
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• 2001

본 논문에서는 무선 LAN의 MAC 계층 프로토콜을 고속으로 처리하는 MAC 기능 칩을 개발하였다. 개발된 MAC 칩은 CPU와의 인터페이스를 위한 제어 레지스터들과 인터럽트 체계를 가지고 있으며, 프레임 단위로 송수신 데이터를 처리한다. 또한 PFDM 방식 물리계층 모뎀을 위한 직렬전송 인터페이스를 가지고 있다. 개발된 MAC 칩은 크게 프로토콜제어기능 블록, 송신기능 블록 및 수신기능 블록 등으로 구성되었으며, IEEE 802.11 규격에 제시된 대부분의 DCF 기능을 지원한다. 구현된 MAC 칩의 동작을 검증하기 위해 RTS-CTS 절차 기능, IFS(Inter Frame Space) 기능, 액세스 절차, 백오프 절차, 재전송 기능, 분할된(fragmented) 프레임 송수신 기능, 중복수신 프레임 검출 기능, 가상 캐리어 검출기능(NAV 기능), 수신에러 발생 경우 처리 기능, Broadcast 프레임 송수신 기능, Beacon 프레임 송수신 기능, 송수신 FIFO 동작 기능 등을 시뮬레이션을 통해 시험하였으며, 시험 결과 모두 정상적으로 동작함을 확인하였다. 본 논문을 통해 개발된 MAC 기능 칩을 이용할 경우 고속 무선 LAN 시스템의 CPU 부하(load)와 펌웨어의 크기를 크게 줄일 수 있을 것으로 기대된다.

• Proceedings of the Optical Society of Korea Conference
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• 2007.02a
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• pp.229-230
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• 2007

• 발명특허
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• v.36 no.1
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• pp.72-76
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• 2011

• Journal of KIISE:Computer Systems and Theory
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• v.26 no.3
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• pp.333-340
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• 1999

이 논문에서는 송수신 부인봉쇄와 내용은닉 서명의 기본 개념과 공평한 비밀정보 교환을 위한 프로토콜인 불확정 전송 프로토콜에 대하여 소개하였다. Lein등이 제안한 검증 가능한 불확정 전송 프로토콜은 대화형 전송 방식을 사용하기 때문에 통신량이 많이 발생한다. 이러한 문제를 해결하기 위하여 M.Bellare & S. Micali가 제안한 비대화형 불확정 전송을 확장하여 믿을 수 없는 두 통신 주체간에 안전하게 비밀 정보를 전송할수 있고 , 송수신자간의 단 한번의 통신으로 이루어지는 검증 가능한 비대화형 불확정 전송 프로토콜을 제안하고, 추후 송수신 사실의 부인에 대한 문제가 발생할 경우 이를 중재할 수 있는 새로운 송수신 부인봉쇄 기능을 갖는 검증 가능한 비대화형 불확정 전송 프로토콜을 제안한고, 제안한 프로토콜에 대하여 안전성을 분석하였다.

• Journal of the Institute of Electronics and Information Engineers
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• v.51 no.9
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• pp.46-53
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• 2014

In this paper, ku-band RF transceiver system is designed for the unmanned aerial vehicle(UAV) line-of-sight(LOS) datalink. The RF transceiver system is consisted of the transmitting and receiving unit, RF front-end unit, and high power amplification unit. The transmitting and receiving unit has the functions of frequency up/down converting and channel changing. The RF front-end unit has the functions of transmitting and receiving signal duplexing, antenna selection, small signal amplification, and frequency filtering excluding the receiving signal. The high power amplification unit has the functions of ku-band power amplification and transmitting power variation(High/Middle/Low/Mute). The frequency up/down converting of transmitting and receiving unit is designed by using the superheterodyne method. The RF transceiver system is designed to obtain the broadband and high linearity properties for the reliable transmission and reception of high data-rate and high speed data. Also, the channel changing function is designed to use selectively the frequency as the operation environment of UAV.

• Journal of the Institute of Electronics and Information Engineers
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• v.51 no.2
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• pp.3-9
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• 2014

We propose energy efficient transmit and receive strategies for nomadic M2M devices. Recently, communication applications consume more and more battery. Hence, the efficient battery management is becoming increasingly important. Turbo code as a channel coding is being widely used in many communication areas. Accordingly, the efficient energy management in using turbo code is an important issue. In this paper, we optimize joint transmit and receive energy for M2M devices pair. We first model the transmit energy and receive energy. Then, we develop the energy efficient transmit and receive strategies.