• 한국해양공학회:학술대회논문집
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• 한국해양공학회 2003년도 춘계학술대회 논문집
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• pp.63-68
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• 2003

For effective conservation of ocean and harbor, long-term and systematic development of the ocean and harbor monitoring system is essential. The monitoring system capable of real-time and accurate data acquisition is necessary for dealing with contamination such as red tide and the flood. This paper introduces the effective and economical real-time harbor environmental monitoring system that utilizes PCS wireless data communication technology. The monitoring system has various functions such as multiple communication, TCP/IP protocol for wireless internet access, system time synchronization, bi-directional communication between the measuring device and the server. The system has been implemented at Shinseondae harbor pier in Busan to validate the systems stability and effectiveness in data acquisition. The acquired real-time ocean and harbor environmental data is expected to have a large effect, when shared by public through internet.

• 대한의용생체공학회:의공학회지
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• 제29권4호
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• pp.295-301
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• 2008

A wireless 3 channel ECG monitoring system was developed so that it could monitor the health and movement state during subject's daily life. The developed system consists of a wireless biomedical signal acquisition device, a personal healthcare server, and a remote medical server. Three experiments were performed to evaluate the accuracy, reliability and operability, applicability during daily life of the developed device. First, ECG signals were measured using the developed device and commercial reference device during sitting and marking time and compared to verify the accuracy of R-R intervals. Second, the reliable data transmission to remote server was verified on two types of simulated emergency event using patient simulator. Third, during five types of motion in daily life, the accuracy of data transmission to remote server using CDMA network was verified on two types of event occurring. By acquiring and comparing subject's biomedical signal and motion signal, the accuracy, reliability and operability, applicability during daily life of the developed device were verified. In addition, PDA-phone based wireless system enabled subject to be monitored without any constraints. Therefore, the developed system is expected to be applicable for monitoring the aged and chronic diseased people and giving first-aid in emergency.

• KSII Transactions on Internet and Information Systems (TIIS)
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• 제10권4호
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• pp.1555-1570
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• 2016

For monitoring forest fires, a real-time system to prevent fires in wider areas should be supported consistently. However, there has still been a lack of the support for real-time system related to forest fire monitoring. In addition, the 'real-time' processing in a forest fire detection system can lead to excessive consumption of energy. To solve these problems, the intelligent data acquisition of sensing nodes is required, and the maximum energy savings as well as rapid and accurate detection by flame sensors need to be done. In this regard, this paper proposes a node built-in filter algorithm for intelligent data collection of sensing nodes for the rapid detection of forest fires with focus on reducing the power consumption of the remote sensing nodes and providing efficient wireless sensor network-based forest environment monitoring in terms of data transmission, network stability and data acquisition. The experimental result showed that battery life can be extended through the intelligent sampling of remote sensing nodes, and the average accuracy of the measurement of flame detection based on the distance is 44%.

• 전자공학회논문지CI
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• 제44권5호
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• pp.28-37
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• 2007

IEEE 1451 standard는 네트워크와 transducer간에 표준 interface를 정의한다. 본 논문에서는 IEEE 1451 Standard 기반의 data acquisition system과 무선 smart sensor node를 구성하기 위한 구조적인 모델을 제안한다. 제안 된 Network Capable Application Processor(NCAP)은 data acquisition의 역할과 smart sensor node와 네트워크 사이에 가교 역할을 한다. 또한 무선 sensor node에게 영향을 주지 않으면서 재구성이 가능하고 DB를 이용하여 transducer의 정확한 정보를 얻는다. Smart sensor node는 그 자신에 관한 기본적인 정보를 디지털 형식으로 제공하는 능력을 가지고 있다. 이 디지털 형식은 Transducer Electronic Data Sheet(TEDS)라 하며 sensor node의 plug-and-play 기능을 가능하게 한다. IEEE 1451.4에서 정의하고 있는 TEDS와 Template를 무선 환경에서 적용하기 위해 형식을 간략화 하였으며 ad-hoc routing을 통해 전송이 이루어진다. 본 연구 시스템은 의료정보 서비스를 제공하기 위한 목적으로 체온과 ECG(Electrocardiogram) 센서를 사용하였다. Template 형식은 센서들의 data sheet를 통해 결정하였으며 센서의 특징을 정확히 표현하기 위해 재구성하였다. NCA의 DB는 다양한 센서 개발에 따라 새로운 Template 및 하부 항목의 등록이 가능하도록 구현하였다.

• 한국정보통신학회:학술대회논문집
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• 한국해양정보통신학회 2004년도 춘계종합학술대회
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• pp.154-157
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• 2004

본 논문은 무지향성 영상획득을 용이하게 하기 위해 임베디드 웹서버의 무선랜을 이용한 CMOS 영상의 무선전송시스템 구현에 관한 연구이다. 시스템은 영상획득부와 임베디드 웹서버부, 클라이언트부로 구성한다. 영상획득부는 CMOS 센서 카메라와 프래임그래버로 구성하고, 임베디드 웹서버부는 무선랜을 구현한 타겟보드로 구성 하며, 클라이언트부는 서버에서 받은 영상을 모니터링 하기 위한 PC로 구성한다. 실험결과 8bit, 320$\times$240 크기의 4:2:2(YCbCr)비율에서 12.7fps 를 얻었으며, 구현된 시스템은 약1.9Mbyte의 전송 되어 시각적으로 원활한 영상이 모니터링 되였다.

• 한국전기전자재료학회논문지
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• 제20권3호
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• pp.281-285
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• 2007

Facilities of electric railway should be maintained only at night and it is necessary to maintain by human power because facilities are installed at a high place. This paper presents the development and application of a real-time data acquisition system for the characteristics measurement of overhead contact wires in electric railway. The system is designed to perform in the telemetry environments that developed to store data by wireless in a live wire state of 25 kV power source. The field test results show that the proposed technique and the developed system can be practically applied to measure characteristics of temperature, displacement, and strain on overhead contact lines.

• 한국해양공학회지
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• 제10권4호
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• pp.160-165
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• 1996

This paper introduces a sea environmental monitoring system for measuring pH,DO, level and temperature. This system is developed using a personal computer(PC) and multiple single board computers. A PC communicates with the single board computers by awireless communication method and transfers data to another personal computer for processing data by a modem. The values of pH,Do,level and temperature, which are basic components to estimate sea environment, are real-timely processed in the single board computer at each stations, and transferred to the monitoring PC. These data are graphically shown on the PC monitor and logged on the data processing system in the form of file. Using the wire and wireless communication system, user can constantly analyze the acquired data and detect the sea contamination.

• 전자공학회논문지SC
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• 제43권1호
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• pp.7-12
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• 2006

본 논문에서는 근거리 및 광역 무선 데이터 통신 상호 연동을 통한 실시간 원격 감시 시스템을 설계 제안하였다. 근거리 망은 소출력 무선 통신용 모듈을 사용하였고 광역망은 CDMA Cellular System의 Packet Data Service를 이용하여 구현하였다. Sensor Unit에서 수집된 데이터는 Data logger를 경유하여 Host computer로 전송되어 인터넷 망을 통하여 윈격 감시 제어 된다.

• 국제학술발표논문집
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• The 5th International Conference on Construction Engineering and Project Management
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• pp.231-234
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• 2013

According to the recent development of USN technology, it has been applied in various fields of construction management. In particular, the concrete curing management using the wireless measurement system is actively being conducted. However, the existing method has limitations such as the reinstallation of temperature sensors and repositioning of repeaters. It is also not easy to acquire the measured data. Thus, this study focuses on the concrete curing management. This study proposes data acquisition method using the smartphone on construction site and tests applicability of the data measuring device and the smartphone. The test allows us to suggest the actual communication distance on construction site and to determine the correction value that is applied to the measured temperature. The data acquisition method proposed in this study is intended to enable appropriate management on construction site and will be able to be applied effectively to a variable construction site. It can also be used in all fields of construction management.

• Smart Structures and Systems
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• 제16권6호
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• pp.1147-1167
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• 2015

Wireless smart sensors, which have become popular for monitoring applications, are an attractive option for implementing structural control systems, due to their onboard sensing, processing, and communication capabilities. However, wireless smart sensors pose inherent challenges for control, including delays from communication, acquisition hardware, and processing time. Previous research in wireless control, which focused on semi-active systems, has found that sampling rate along with time delays can significantly impact control performance. However, because semi-active systems are guaranteed stable, these issues are typically neglected in the control design. This work achieves active control with smart sensors in an experimental setting. Because active systems are not inherently stable, all the elements of the control loop must be addressed, including data acquisition hardware, processing performance, and control design at slow sampling rates. The sensing hardware is shown to have a significant impact on the control design and performance. Ultimately, the smart sensor active control system achieves comparable performance to the traditional tethered system.