• 대한전자공학회:학술대회논문집
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• 대한전자공학회 2005년도 추계종합학술대회
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• pp.1101-1104
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• 2005

As intelligence of robot is developed, consumer of robot changes by ordinary people. Intelligent service robot is produced to a target of ordinary people. It is risen that need the most service robot business. Among the control mobile robot because using network by real time. Do to appear on mobile phone LCD screen being transmitted image from device that acquire transmit of mobile phone user interface development and real time mobile robot in this study. Use the BREW that is Qualcomm's Mobile platform for mobile phone user interface development. Mobile phone JPEG compression function chooses excellent camera phone and display transmit image which send connection setting screen and mobile robot on LCD screen by real time. At the same time, materialize to make screen that can process button input that can control transfer of robot. Also, Relay Server used to help processing of protocol to control direction of mobile robot.

• IEIE Transactions on Smart Processing and Computing
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• 제5권3호
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• pp.164-168
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• 2016

A low insertion-loss, high-isolation switch based on single pole double throw (SPDT) for a 2.4GHz Bluetooth low-energy transceiver is presented in this paper. In order to increase isolation, the body floating technique is implemented. Based on characteristics whereby the ratio of the sizes of the shunt and the series transistors significantly affect the performance of the switches, the device sizes are optimized. A simple matching network is also designed to enhance the insertion loss. Thus, the SPDT switch has high isolation and low insertion loss without increasing the complexity of the circuit. The proposed SPDT is designed and simulated in a complementary metal-oxide semiconductor 65nm process. The switch has a $530{\mu}m{\times}270{\mu}m$ area and achieves 0.9dB, 1.78dB insertion loss and 40dB, 41dB isolation of transmission, reception modes, respectively.

• IEIE Transactions on Smart Processing and Computing
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• 제1권2호
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• pp.106-116
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• 2012

The huge success of location-aware applications has called for the rapid development of an alternative positioning system to the global positioning system (GPS) for indoor localization based on existing technologies, such as 802.11 wireless networks. This paper proposes the Wireless MAC Processor Positioning System (WMPS), which is a localization system running on off-the-shelf 802.11 Access Points and based on the time-of-flight ranging of users' standard terminals. This paper proves through extensive experiments that the propagation delays can be measured with the accuracy required by indoor applications despite the different noise components that can affect the result: latencies of the hardware transreceivers, multipath, ACK jitters and timer quantization. Key to this solution is the choice of the Wireless MAC Processor architecture, which enables a straightforward implementation of the ranging subsystem directly inside the commercial cards without affecting the basic DCF channel access algorithm. In addition to the proposed measurement framework, this study developed a simple and effective localization algorithm that can work without requiring any preliminary calibration or device characterization. Finally, the architecture allows the measurement methodology to be adjusted as a function of the network load or propagation environments at the run time, without requiring any firmware update.

• 한국ITS학회 논문지
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• 제9권2호
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• pp.104-109
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• 2010

본 논문에서는 차량의 무선단말을 이용하여 유선 네트워크와 연결된 정보통신 시스템 서비스를 이용하는 텔레메틱스 환경에서 제3자의 도청이나 공격을 막기 위한 사용자 인증기술을 제안한다. 제안된 사용자 인증방식에서는 차량안의 사용자의 음성신호로부터 생성된 음성 바이오 키를 이용하여 패킷 음성데이터를 암호화하여 정보통신 시스템에 전송하고, 정보통신 시스템 서버에서는 암호화된 패킷 음성데이터로부터 사용자의 음성특징을 복원하여 미리 등록된 사용자의 음성 바이오 키와 비교하여 실시간으로 사용자를 인증한다. 실험을 통해 다양한 공격으로부터 제안된 방식에 대한 안정성을 분석하였다.

• Journal of Electrical Engineering and Technology
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• 제11권6호
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• pp.1769-1776
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• 2016

For on-line partial discharge (PD) monitoring of rotating machines, a novel sensor is proposed, which can be installed on the power lead inside the terminal box of the machine. The sensor has been designed to have high capacitance, and minimal reflection of measured pulses. As a sensitivity of the sensor, transfer impedance $Z_t$ has been measured and compared to conventional coupler-type sensors. A simple method is presented for measuring $Z_t$ of coupler sensors, using a vector network analyzer and a practical lead-cable of rotating machine. Through this method, it became possible to measure the $Z_t$ of coupler sensors including the installation environment of them. The $Z_t$ of the proposed sensor is higher than that of same sized other conventional couplers at frequencies between 30 and 92 MHz. Another sensitivity test has been performed using a PD calibrator as a test pulse source. The proposed sensor has higher measured peak voltage than the conventional coupler type sensors when the same charges were input.

• Journal of Information Processing Systems
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• 제12권2호
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• pp.263-274
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• 2016

The exceptional development of electronic device technology, the miniaturization of mobile devices, and the development of telecommunication technology has made it possible to monitor human biometric data anywhere and anytime by using different types of wearable or embedded sensors. In daily life, mobile devices can collect wireless body area network (WBAN) data, and the co-collected location data is also important for disease analysis. In order to efficiently analyze WBAN data, including location information and support medical analysis services, we propose a geohash-based spatial index method for a location-aware WBAN data monitoring system on the NoSQL database system, which uses an R-tree-based global tree to organize the real-time location data of a patient and a B-tree-based local tree to manage historical data. This type of spatial index method is a support cloud-based location-aware WBAN data monitoring system. In order to evaluate the proposed method, we built a system that can support a JavaScript Object Notation (JSON) and Binary JSON (BSON) document data on mobile gateway devices. The proposed spatial index method can efficiently process location-based queries for medical signal monitoring. In order to evaluate our index method, we simulated a small system on MongoDB with our proposed index method, which is a document-based NoSQL database system, and evaluated its performance.

• 스마트미디어저널
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• 제4권2호
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• pp.46-54
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• 2015

Communication between ECUs (Electronic Control Units) in agricultural machineries tends to use IS011783 widely, that is PGN (Parameter Group Number) based communication protocol lays on CAN protocol by altering its identifier part. Messages in line are transferred and received between ECUs according to ISO11783 standard. This paper discusses about design of wireless monitoring system. We used an ARM Cortex-M3 microcontroller embedded development board and marvel8686 wireless module. The wireless ISOBUS monitoring system, attached to communication line, reads messages, interpret them, and display them on the screen in easily comprehendible form. It can be used to generate messages and monitor the traffic on physical bus systems. The monitoring system connected to ECUs, monitor and simulate real traffic of communication and functionality of the ECUs. In order to support our work, we have implemented the monitoring tool. The development consists of two parts: GUI of the application and firmware level programming. Hence the monitoring system is attached to the communication line and equipped by Wi-Fi module; farmer/dispatcher in a farm monitors all messages in communication line on personal computer and smart device.

• 한국산업정보학회논문지
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• 제21권6호
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• pp.31-39
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• 2016

본 논문에서는 Microsoft사의 Disk Operating System(DOS)와 같은 단일 프로그램만 지원하는 운영체제상에서의 무선 원격제어를 위한 새로운 시스템을 제안한다. 제안하는 시스템은 DOS 시스템과 윈도우즈 컴퓨터간의 중계 역할을 위해 비디오 전송기, 가상 네트워크 드라이버, 무선 키보드 모듈로 구성된다. 15Mbps 무선 랜 환경(802.11n)에서 성능을 측정한 결과 영상의 경우 초당 10 ~ 15 영상프레임을 전송하고, 네트워크 드라이버의 연결속도는 약 8Mbps이며, 키보드 입력의 경우 실시간 처리가 가능하다. 따라서 본 논문에서 제안한 시스템은 DOS기반 어플리케이션의 원격제어 솔루션으로 매우 적합하다 할 수 있다.

• 한국방송∙미디어공학회:학술대회논문집
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• 한국방송공학회 1996년도 학술대회
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• pp.27-31
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• 1996

In this paper, The SSPA(Solid State Power Amplifier) is 100 watts amplifier which is used with C-Band Satellite communication Up-Link frequency, 5.875 ∼6.425 GHz. SSPA requires more output power than is available from a single GaAs FET with result it is necessary to combine the output of many device. To achieve a high power, it is important to make a good N-way power divider which has a small different phase, good combining efficiency and high power handling capability. The reliability of Power GaAs FET decrease with increasing junction temperature, power amplifier in general dissipate amount of power. It is important to provide them with a heatsink and a temperature compensation circuit to dispose of the unwanted heat. To compensate temperature, Using PIN diode attenuator, it is enable to get a precision gain control. The output power of the SSPA is more than 100 watt with which the TWTA (Traveling-Wave Tube Amplifier) can be replaced. Each stage was measured by the Network analyzer PH8510C, Power meter Booton 42BD, The gain is more than 53 dB, flatness is less than 1.5 dB.

• 조명전기설비학회논문지
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• 제14권6호
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• pp.18-25
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• 2000

본 논문에서는 과도전압과 전원선 방해파로부터 가전기기틀 안전하게 보호할 수 있는 전자파 대용 단위세대 분전반의 설계 및 제작에 대하에 기술하였다. 제안한 분전반은 바리스터, 캐패시터 및 간선도채의 인덕턴스로 구성한 과도전업 차단장치와 전자파 필터를 내장하고 있다. 시제작한 분전반은 IEC 규격의 조합형 서지 발생장치와 회로밍 분석키를 이용하여, 과도전압에 대한차단특성과 전원선 방해파의 감쇠특성을 평가하였다. 실험 결과로부E] 본 연구에서 제안한 분전빈은 IEC 61000-4-5에 규정한 서지내생기준을 만족하였으며, 150[kHz]-30[MHz] 대역의 전원선 방해파에 대해 20[dB] 이상의 감소효과를 나타내었다.