• 한국정밀공학회:학술대회논문집
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• 한국정밀공학회 2003년도 춘계학술대회 논문집
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• pp.1042-1045
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• 2003

In this paper, we present a new method for the monitoring of Electric Control Unit's(ECU) self-diagnostic and the sensor signals of vehicle through Web. In order to measure the ECU's self-diagnostic and sensor signals, the interfaced circuit is designed to communicate ECU and terminal according to the ISO, SAE regulation of communication protocol standard. Microprocessor 80C196KC is used for communicating ECU's self-diagnostic signals and the results are sent to the Embedded Linux System(ELS) through RF module. ELS is developed by SA1110, RF module, Embedded Linux. All commands related in ECU communication are executed through Web. The CGI program composed in web server is executed by user and will return sensor signals from ECU Software on Embedded Linux system is developed to monitor the ECU's sensor signals using the arm compiler tool chain in which RS232 port is programmed by half duplex method. The possibility for remote measurement of ECU sensor signal through Web is verified through the developed systems and algorithms.

• Nuclear Engineering and Technology
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• 제56권2호
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• pp.568-574
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• 2024

The development of radiation-tolerant radio-frequency (RF) systems can be a solution for applications in extreme radiation environments, such as nuclear power plant monitoring and space exploration. Among the crucial components within an RF system, the low noise amplifier (LNA) stands out due to its vulnerability to TID effects, mainly relying on transistors as its main devices. In this study, the TID effects in the LNA using standard 0.18 ㎛ complementary metal oxide semiconductors (CMOS) technology are estimated and analyzed. The results show that the LNA can withstand absorbed radiation up to 100 kGy. The S₂₁, S₁₁, noise figure (NF), stability (K), and linearity of the third input intercept point (IIP3) slightly shifted from the initial values of 0.8312 dB, 0.793 dB, 0.00381 dB, 1.34406, and 2.36066 dBm, respectively which are still comparable to the typical performances. Moreover, the standard 0.18 ㎛ technology has demonstrated its radiation tolerance, as it exhibits negligible performance degradation in the conventional LNA even when exposed to radiation levels up to 100 kGy. In this context, simulation approach offers a means to predict the TID effects and estimate the radiation exposure limit for electronic devices, particularly when transistors are used as the primary RF components.

• 한국철도학회:학술대회논문집
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• 한국철도학회 2011년도 정기총회 및 추계학술대회 논문집
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• pp.737-747
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• 2011

5678SMRT has installed various sensor for operating conditions(field of electric, facilities, signal, communication equipment and track) and environment of Every Function Room for remotely detecting and monitoring. Installed sound sensor for analyzed after remotely heard the noise of every equipment at Every Function Room and temperature sensor for check the temperature condition of Every Function Room. Additional installed voltage sensor in signal equipment room for monitoring RF track-circuit's voltage condition. Installed displacement sensor at The Chungdam bridge's railway for measuring and monitoring track displacement caused by temperature change and Pan/Tilt camera at sub-station and drainage for remotely field monitoring. Installed sensor for each equipment's operating condition and failure at Every Function Room then periodic check of workforce turned to around-the-clock surveillance by sensor therefore improvement of operating equipment. SMRT is lots of prevent a failure by Immediately detect of precondition of equipment failure by analyzed the sensor data. If the occurrence of an failure, become detected Immediately so possibility correct diagnosis and order by remotely field check by installed camera and sound sensor at field.

• 한국항행학회논문지
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• 제24권6호
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• pp.593-600
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• 2020

해양 IoT 서비스를 위한 장치들은 해양 환경에 강인해야 한다. 특히 바닷물 속에 부유하는 전송 장치는 바닷물의 영향을 덜 받도록 설계되어야 한다. 본 연구에서는 전자 어구 실명제 모니터링 시스템에서 어구 상태를 감시하는 부이에 내장되는 안테나를 설계하고 제작한 결과를 보이고 있다. 안테나의 주파수 대역은 920 MHz이고, 부이의 초소형과 경량화를 위해 PCB 패턴 안테나 구조로 설계 제작되었다. 시뮬레이션 결과 제안한 안테나를 내장한 부이가 바닷물 속에 잠기는 정도가 심할수록 반사 계수 증 RF 특성이 저하되지만 빔의 방사 각도는 안테나 하층부에서 점점 상층부로 옮겨가는 것을 확인하였다. 즉 바닷물의 영향을 많이 받을수록 전파 성능은 저하되지만 방사 특성은 해양 IoT 서비스 환경에 적합하다는 것을 확인하였다. 향후 RF 성능을 개선할 수 있는 안테나 구조를 변경 설계하면 제안한 안테나와 부이는 LPWA (low power wide area) 기반 IoT 네트워크 구현에 기여할 것으로 기대된다.

• Journal of Biosystems Engineering
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• 제26권2호
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• pp.93-104
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• 2001

A linear chemigation system, integrating agrichemical appication units of pesticide and fertilizer into an irrigation system, was selected as a suitable model for the cost savings in farm management and automation. Technical designs were conducted in the areas of structure, power, drive, control, and hydraulic systems. An experimental farm was sectioned into the fields of 40m by 200m and systemized with the linear-move chemigation system of 36m in span. The chemigation system consisted of a base unit monitoring and controlling overall operation, and a driving unit traveling linearly and injecting agrichemicals. Monitoring and interlocking systems were utilized against unexpected malfunctions of power, injection and drive systems using radio freuency modems between the units. The system can be also modified to various farm sizes and stationary systems of indoor and outdoor.

• 융합신호처리학회 학술대회논문집
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• 한국신호처리시스템학회 2000년도 추계종합학술대회논문집
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• pp.237-240
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• 2000

본 논문에서는 ISM(Industrial Scientific Medical) 대역 424MHz부터 429MHz까지의 범위에서 동작하는 열차 후부 감시제어 시스템용 RF 전력증폭기를 설계 및 제작하였다. 424MHz대역에서의 2W급 대전력 증폭기의 설계방법으로는 Double Stub Tuner구조를 이용하여 최적 부하 임피던스를 추출하는 방법을 제시하였고, 초고주파 시뮬레이터인 Serenade8.0을 사용하여 Drive_amp와 LPF를 설계하였다. 제작된 Drive_amp와 LPF의 성능 및 특성은 시뮬레이션 한 결과와 거의 일치하였으며, 대전력 증폭기의 측정결과로는 추출하고자 하는 출력 레벨인 33㏈m을 얻을 누 있었고, 원신호의 Hamonic 주파수 성분과는 40.34㏈c의 결과를 보임으로써 안정된 전력증폭기를 구현하였다.

• 한국정보처리학회:학술대회논문집
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• 한국정보처리학회 2013년도 춘계학술발표대회
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• pp.49-51
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• 2013

본 논문에서는 효율적인 전력사용을 위해 가정에서 사용하는 대기전력을 모니터링 할 수 있는 시스템을 구현하였다. 무선 근거리 통신을 지원하는 RF통신을 이용한 콘센트를 이용하여 가전기기의 현 상태에 따라 평균 전력량을 대입, 예상 전력량을 계산하여 임베디드 보드 및 스마트폰에서 전력량을 실시간으로 모니터링 할 수 있도록 시스템을 구현 하였다.

• 한국진공학회:학술대회논문집
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• 한국진공학회 2013년도 제45회 하계 정기학술대회 초록집
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• pp.123.2-123.2
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• 2013

Etching endpoint detection with plasma impedance monitoring (PIM) is demonstrated for small area dielectric layers inductive coupled plasma etching. The endpoint is determined by the impedance harmonic signals variation from the I-V monitoring system. Measuring plasma impedance has been examined as a relatively simple method of detecting variations in plasma and surface conditions without contamination at low cost. Cluster analysis algorithm is modified and applied to real-time endpoint detection for sensitivity enhancement in this work. For verification, the detected endpoint by PIM and real-time cluster analysis is compared with widely used optical emission spectroscopy (OES) signals. The proposed technique shows clear improvement of sensitivity with significant noise reduction when it is compared with OES signals. This technique is expected to be applied to various plasma monitoring applications including fault detections as well as end point detection.

• 대한기계학회:학술대회논문집
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• 대한기계학회 2003년도 춘계학술대회
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• pp.857-862
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• 2003

In this paper, we concern for development of precise measuement system for civil structure by using one chip microprocessor based on communication system. The datalogger is developed by using 80C196KC microprocessor. It has RF communication modul and data acquisition function for several kinds of sensors such as load cell, tilt-meter, strain gauge, tension meter, themocouple and so on. The data is acquisited by datalogger is sent to a main server which is located at central monitoring office. The server has a function suppervising several data points located at civil structures, it analyzes the data and shows the data graphically. The effectiveness of the developed system is proven through experimental results by an application for the bridge of Nakdong river edge in Busan, Korea.

• 한국산학기술학회논문지
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• 제7권3호
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• pp.285-290
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• 2006

자동차에 있어서 안전은 가장 중요한 설계 인자이다. 자동차 타이어 압력은 자동차 안전에 중요한 요소로 알려져 있다. 능동적 안전 측면에서, 타이어공기압검지장치(TPMS)는 아주 중요한 요소라 할 수 있다. RF 통신 기능을 갖고 타이어 내부에서 타이어 압력을 모니터링하는 장치는 광범위한 운전영역에서 정회한 압력을 검지하는 효과적 방법이다. 본 논문에서는 타이어 압력 및 온도보상 특성 관계를 조사하였다. 본 연구를 통하여, 차량 조건과 주행 변수를 고려한 TPMS 제어 로직의 가이드 라인을 설정할 수 있었다.