• Proceedings of the Computational Structural Engineering Institute Conference
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• 2010.04a
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• pp.678-681
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• 2010

최근 건설 기술의 비약적인 발전으로, 국내외적으로 장대교량의 건설이 증가하고 있다. 이러한 장대교량들은 지속적인 안전성 관리가 필요하며 현재 국내 다수의 장대교량들에는 다양한 센서로 이루어진 구조건전성 모니터링 시스템이 설치, 운용되고 있다. 장대교량과 같은 대형 구조물의 물리적 상태를 정확하게 파악하기 위해서는 다수의 센서배치가 필요로 하지만, 이는 센서 자체의 비용뿐만 아니라 센서와 데이터 서버를 연결하는 케이블의 설치비용으로 인하여 상당히 제약을 받을 수 밖에 없다. 실례로 홍콩의 Tsing Ma 대교의 경우 350개의 센서를 설치하는데 약 8 백만불이 넘는 금액이 들었으며(Farrar 등, 2004), Celeby(2002)의 보고에 의하면 각 센서의 채널 당 케이블의 설치비용으로 약 5000불의 비용이 소모되고 있다. 본 연구에서는 이러한 센서와 이러한 불편함을 극복하기 위하여 자체 연산기능을 가지고 있는 스마트 무선 센서를 개발하고, 이를 해남과 진도를 잇는 연육교인 제 2 진도대교에 적용, 사장교의 구조 건전성을 저비용 및 높은 편의성으로 모니터링 하기 위한 테스트베드를 구축하였다.

• The Journal of the Korea institute of electronic communication sciences
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• v.14 no.4
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• pp.723-728
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• 2019

Citizens' distrust of water pollution is very high in tap water that we routinely drink. In addition, water pollution accidents of tap water are difficult to predict and the risk is high, so real-time monitoring and management are needed. Therefore, it is necessary to introduce real-time water quality monitoring using the Internet of things(IoT). Residual chlorine is more persistent and economical than other disinfectants and it is easy to check residual effect, so it is mainly used as a disinfection index in waterworks. It can be monitored in real time by using IoT technology in order to secure the safety of tap water. In this study, we developed smart device for real-time water quality monitoring using amperometry sensor and analyzed its performance.

• Smart Media Journal
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• v.5 no.3
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• pp.74-80
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• 2016

In this paper, we propose an accident-prevention smart monitoring system for Haenyeo(Woman diver) using Zigbee module and GPS sensor. This system can collect such information as the diving location, the body temperature, the depth of diving, and the diving time of a Woman diver working under the water and then respond immediately to an accident occurring. The research developed a smart Teawak and smart swimming goggles which can measure the state of a Woman diver and her diving activities. Smart Teawak, the buoy tool while a Woman diver is collecting seafoods under water, is able to receive GPS and transmit the data from smart swimming goggles and Zigbee Module to IHSS(IoT based Haenyeo Safety service Software) server. In addition, IHSS, a responsive web, provides the diving location and the state of a Woman diver on the smart phone. As a result, the system will be useful in the aspects of Woman diver' health care and the safety, furthermore, which will significantly contribute to global marketing of Woman diver with its being designated as a UNESCO intangible cultural asset.

• Journal of Appropriate Technology
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• v.6 no.2
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• pp.136-145
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• 2020

Agriculture is the backbone of the economy of most developing countries. In these countries, agriculture or farming is mostly done manually with little integration of machinery, intelligent systems and data monitoring. Irrigation is an essential process that directly influences crop production. The fluctuating amount of rainfall per year has led to the adoption of irrigation systems in most farms. The absence of smart sensors, monitoring methods and control, has led to low harvests and draining water sources. In this research paper, we introduce a 433 MHz Radio Frequency and 2G based Smart Irrigation Meter System and a water prepayment system for rural areas of Tanzania with no reliable internet coverage. Specifically, Ngurudoto area in Arusha region where it will be used as a case study for data collection. The proposed system is hybrid, comprising of both weather data (evapotranspiration) and soil moisture data. The architecture of the system has on-site weather measurement controllers, soil moisture sensors buried on the ground, water flow sensors, a solenoid valve, and a prepayment system. To achieve high precision in linear and nonlinear regression and to improve classification and prediction, this work cascades a Dynamic Regression Algorithm and Naïve Bayes algorithm.

• Journal of the Korea Convergence Society
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• v.9 no.3
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• pp.39-44
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• 2018

In this paper, we propose a monitoring method of smartphone to integrate IoT technology to monitor the state of the vehicle for fault diagnosis of E-Mobility power converter. In China, EV regulations are being implemented to promote technological development and market changes in electric vehicles. To meet this trend, E-Mobility should study suitable monitoring technology. The OBD-II method used in existing automobiles is a wired / wireless communication method. In order to apply it to E-Mobility, additional interface and communication link are required. In this paper, we propose a technology to monitor the status information of power converter for E-Mobility by combining existing technology with IoT. This technology simplifies the existing network protocol and hardware interface, and confirms that the E-Mobility power converter and smartphone can be interworked for easy user monitoring. And we have done research to make high value product design from the aspect of function.

• Journal of the Korea institute for structural maintenance and inspection
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• v.11 no.2
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• pp.134-144
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• 2007

In this study, a smart sensor unit is developed by using the smart sensor technology that is being rapidly developed in recent years for structural health monitoring system, and its performance is evaluated through various experiments, and also, damage detection experiment is performed on a model structure. This paper as the first half of this study contains the development and performance evaluation of the smart sensor. In the latter half of this study, structure damage detection experiment is performed for the application of verified smart sensor unit into structural health monitoring, and it is compared with a wire measurement system. The smart sensor is developed by using high-power wireless modem, MEMS Sensor and AVR microcontroller, and an embedded program is also developed for the control and operation of the sensor unit. To verify the performance of the smart sensor, many experiments are performed for sensitivity and resolution analysis tests, data acquisition by using cantilever beam and shaker, and on-site application using actual bridge. As a result, the smart sensor proves to be satisfactory in its performance.

• Proceedings of the Korean Society of Computer Information Conference
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• 2015.07a
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• pp.103-106
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• 2015

본 논문에서는 비상전원 기능을 가지는 가정용 3kW 스마트그리드 홈 에너지 시스템을 관리하는 에너지 모니터링 시스템 설계 및 구현을 제안한다. 제안하는 시스템은 3kW 스마트그리드 홈 에너지 시스템으로 인터넷을 통해 전력 정보를 수집하고, 수집된 전력 정보를 효율적으로 사용하기 위해서 모니터링과 스케줄러를 통한 관리하는 방법에 대한 설계 및 구현하고, 시험 및 평가를 통해서 에너지 절감을 확인할 수 있었다.

• Proceedings of the Korean Information Science Society Conference
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• 2011.06d
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• pp.65-67
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• 2011

스마트 홈은 유비쿼터스 환경을 가정 내에 실현하여 생활환경의 지능화, 환경친화적인 주거생활, 삶의 질 혁신을 추구하는 주거공간을 만들고자 하는 목표를 가지고 있다. 이러한 목표에 더 가까이 접근하기 위한 연구 및 개발이 이루어지고 있다. 그러나, 현재의 홈 네트워크 시스템은 서로 다른 사용자의 특성을 고려하지 않고 단일화된 서비스만을 제공하고 있다. 이에 본 논문에서는 스마트폰에 있는 GPS, Accelerometer, System Log 등의 정보를 활용하여 더 지능적인 서비스를 제시하고, 스마트 홈의 상황을 사용자가 좀 더 쉽게 파악하고 관리할 수 있도록 스마트폰 기반의 모니터링 및 제어 서비스를 제공한다.

• Annual Conference of KIPS
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• 2013.11a
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• pp.715-718
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• 2013

단방향 통신을 하는 기존의 전력망에서 할 수 없었던 전력수요 모니터링, 신재생 에너지 활성화 등이 가능하도록 소비자와 전력 사업자간의 양방향 통신을 하는 스마트그리드의 관심이 증가하고 있다. 스마트그리드는 기존 전력망에 IT기술을 접목하여 전력 사업자와 소비자 간의 양방향 통신이 가능하기 때문에 전력 사용에 대한 실시간 모니터링을 하며 안정적인 전력을 공급할 수 있고 생산량이 불안정한 신재생 에너지를 효율적으로 관리 할 수 있는 장점을 갖고 있다. 하지만 양방향 통신을 위해 공개망과 연계되면서 기존의 공개망이 갖고 있는 정보 변조, 위장 공격 등의 보안위협이 그대로 발생할 수 있다. 따라서 본 논문에서는 스마트카드를 이용한 인증을 통해 스마트그리드 환경에서 전송되는 정보에 대한 위장이나 조작 등의 보안위협으로부터 보호할 수 있는 기법을 제안한다.

• Journal of Internet of Things and Convergence
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• v.10 no.2
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• pp.61-67
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• 2024

In order to monitor the growth environment of new varieties of crops, it is necessary to build the agricultural production infrastructure and strengthen the agricultural resource management system using popular smart sensor tag technology. In addition, the infrastructure for improving high-quality new varieties of crops using IoT technology and the monitoring system must be strengthened. In other words, widespread smart sensor (RFID UHF Sensor Tag) technology for environmental monitoring required for improving new crop varieties is desperately needed in the smart farm environment. Therefore, in this paper, we implemented an integrated sensor that can implement smart tag functions based on heterogeneous integrated sensors. In addition, we developed a technology that can manage crops in real time through the implemented smart integrated tag and smartphone linkage. For this purpose, an integrated antenna capable of RFID and Bluetooth communication was constructed. In addition, a communication method that allows information to be collected directly from the smartphone through the Bluetooth function was used.