• Journal of Ecology and Environment
• /
• 제41권3호
• /
• pp.72-77
• /
• 2017

The world of technology is pleasantly evolving to a stage where small robotic aid may be used to ease the work of researchers, and to one day bring more accurate results than the current human abilities allow. In the research field of species monitoring in biology, unmanned aerial vehicles (UAVs) have begun to play an important role in how research is approached, analyzed, and then applied for further investigation, particularly by focusing on a single species. This paper uses data that has been collected from June to October 2015, to demonstrate how the innovative idea of using UAVs to monitor a particular species will bring a positive development in conservation research, and what it was able to achieve in this research field so far. More precisely, we examine the potential of UAVs to take center stage in future research, as well as their current accuracy. This paper describes the use of the commercially available Phantom 2 Vision+ for the detection, assessment, and monitoring of the butterfly species Libythea celtis, demonstrating how it can help the monitoring of butterflies and how it could be developed for even more adventurous and detailed research in the future.

• Smart Structures and Systems
• /
• 제15권2호
• /
• pp.469-488
• /
• 2015

Thermal loads, especially thermal gradients, have a considerable effect on the behaviors of large-scale bridges throughout their lifecycles. Bridge design specifications provide minimal guidance regarding thermal gradients for simple bridge girders and do not consider transversal thermal gradients in wide girder cross-sections. This paper investigates the three-dimensional thermal gradients of arch bridge girders by integrating long-term field monitoring data recorded by a structural health monitoring system, with emphasis on the vertical and transversal thermal gradients of wide concrete-steel composite girders. Based on field monitoring data for one year, the time-dependent characteristics of temperature and three-dimensional thermal gradients in girder cross-sections are explored. A statistical analysis of thermal gradients is conducted, and the probability density functions of transversal and vertical thermal gradients are estimated. The extreme thermal gradients are predicted with a specific return period by employing an extreme value analysis, and the profiles of the vertical thermal gradient are established for bridge design. The transversal and vertical thermal gradients are developed to help engineers understand the thermal behaviors of concrete-steel composite girders during their service periods.

• 한국항해항만학회:학술대회논문집
• /
• 한국항해항만학회 2014년도 춘계학술대회
• /
• pp.68-69
• /
• 2014

우리나라 관할해역까지 확장된 해상교통 모니터링이 필요하여, 장기적으로는 전 세계 원하는 해역의 선박 모니터링이 요구되는 시점이다. 이를 통해서만 우리의 Sea Line의 확보가 가능하며, 해양 경제영토의 확장이 가능하기 때문이다. 이와 같은 목표를 위한 초기 단계로, 경기만 연안 통합모니터링 시험을 거쳐 2013년 11월에는 이어도해양과학기지에서 실험이 이루어졌으며, 이 결과를 이번 학술대회에서 소개하고자 한다.

• Journal of Advanced Marine Engineering and Technology
• /
• 제32권6호
• /
• pp.989-996
• /
• 2008

Recently, a few types of fish-cage in open sea are researched. This fish-cage has to operate monitoring system for keeping an optimum living condition for fish. The most efficient monitoring system is WVMS(Wireless Vision Monitoring System) for fish-cage in open sea. WVMS should be able to transmit video signal and communicate with each controller. So. it needs to be based on WLAN(Wireless LAN) which has characteristic of higher transfer-rate, In this paper, we propose a structure of WVMS using WLAN equipments for maritime environment and prove its effectiveness. We present the propagation loss model of WVMS's communication channel. measured by field test, and discuss its validity compared with the predictive value based on the Friss propagation model and Plane earth reflection model. We present the number of frames that is received from WLAN modem connecting with underwater-camera in field test spots. As a result, we confirmed that proposed WVMS is suitable for maritime environment and it is possible to be applied to fish-cage in open sea on 'seogwipo'.

• 전자공학회논문지SC
• /
• 제49권2호
• /
• pp.1-9
• /
• 2012

본 논문에서는 이원화된 필드버스 기반의 선박 엔진용 분산 제어시스템을 설계 및 구현한다. 구현된 시스템은 엔진의 상태 값을 감시하기 위해서 CAN과 MODBUS 프로토콜을 혼합 형태로 이용하여 서로 다른 영역의 통신 구조로 구성한다. 첫 번째 층은 CAN프로토콜을 이용하여 엔진의 상태 값을 공유하게 된다. 두 번째 층은 MODBUS를 이용하여 엔진룸에서 기관실의 AMS로 모니터링 데이터 전송을 위한 통신을 지원한다. 테스트 베드 환경을 구축하여 구현된 시스템을 선급기술규칙의 요구사항에 의거하여 테스트 및 성능 검증하였다.

• 한국전기전자재료학회:학술대회논문집
• /
• 한국전기전자재료학회 2007년도 하계학술대회 논문집 Vol.8
• /
• pp.527-528
• /
• 2007

A field-oriented UHF system for on-line PD monitoring of transformers is designed, which has been installed inside the oil tank of a 220kV transformer in a substation. This system has successfully captured long intermittent discharge signals that hadn't been detected through conventional techniques, and solved the problem successfully. The results demonstrate that UHF technique has great advantages for on-line PD monitoring of transformers. By adopting the peak detection technique, it becomes easy and effective for the transplantation of the phase-resolved pattern recognition technique from conventional method to UHF method, and then to realize continuous on-line monitoring, source characterization and trending analysis.

• 대한원격탐사학회:학술대회논문집
• /
• 대한원격탐사학회 1999년도 Proceedings of International Symposium on Remote Sensing
• /
• pp.468-473
• /
• 1999

This study was carried out to assess the use of RADARSAT data which is C-band with HH polarization for the rice growth monitoring in Korea. Nine time-series data were taken by shallow incidence angle (standard beam mode 5 or 6) during rice growing season. And then, backscatter coefficient ($\sigma$$^{\circ}$) were extracted by calibration process for comparing with rice growth parameters such as plant height leaf area index(LAI), and fresh and dry biomass. Field experimental data concerned with rice growth were collected 8 times for the ground truth at the study area, Tangjin, Chungnam, Korea. At the maximum vegetative stage of rice, backscatter coefficients were the highest at the flooded rice field ranging from -4.4dB~-3.1dB. The temporal variation of backscatter coefficient($\sigma$$^{\circ}$) in rice field was significant in this study Backscatter coefficient ($\sigma$$^{\circ}$) of rice field was a little bit lower again after heading stage. This results show RADARSTA data is promising for rice monitoring.

• 한국환경과학회지
• /
• 제25권10호
• /
• pp.1389-1396
• /
• 2016

A monitoring system for a field magnetometer was configured with assistance of a Raspberry Pi as a data logger. The suggested geomagnetic system uses a semi-real-time data transmission module. The system consists of two parts: a field-observation part and a data-center part. The field-observation part comprises a Raspberry Pi, magnetometer, LTE router, and power source, while the data center part takes samples at the site. The collected magnetometer data are then sent to the data center through the LTE router. The newly designed monitoring system was deployed and checked in Jeju-do island, and found to operate stably. The suggested system is promising in that it is simple and cost saving, providing at least physical insight and knowledge on the complex natural phenomena.

• Journal of Yeungnam Medical Science
• /
• 제41권1호
• /
• pp.53-55
• /
• 2024

A noncontact sensor field is an innovative device that can detect, measure, or monitor physical properties or conditions without direct physical contact with the subject or object under examination. These sensors use a variety of methods, including electromagnetic, optical, and acoustic technique, to collect information about the target without physical interaction. Noncontact sensors find wide-ranging applications in various fields such as manufacturing, robotics, automobiles, security, environmental monitoring, space industry, agriculture, and entertainment. In particular, they are used in the medical field, where they provide continuous monitoring of patient conditions and offer opportunities in rehabilitation medicine. This article introduces the potential of noncontact sensors in the field of rehabilitation medicine.

• 지질공학
• /
• 제33권1호
• /
• pp.27-37
• /
• 2023

땅밀림은 균열 및 단차가 오랜시간에 걸쳐 발생하기 때문에 장기적인 모니터링이 반드시 필요하다. 그러나 사면변위계, 경사계 등을 이용한 장기모니터링은 비용 및 관리 차원에서 비효율적이다. 따라서 본 연구에서는 땅밀림이 진행 중인 지역을 테스트베드로 선정하고 영상을 이용한 모니터링 가능성을 평가하였다. 이를 위해 지상라이다와 드론을 이용하여 땅밀림 모니터링을 실시하고 계측자료와 비교하였다. 현장 계측은 사면변위계를 설치하여 분단위 측정을 실시하였다. 분석값의 비교결과 정확도에 따라 미세한 차이는 있지만 지상라이다와 드론을 이용한 모니터링에서도 사면변위계와 유사한 값을 얻을 수 있었다. 이는 땅밀림의 정밀분석 및 예측을 위해서는 분단위의 현장계측이 필요하지만 지상라이다 및 드론을 활용한 기초 모니터링의 가능성을 보여준다. 향후 다양한 차원에서 영상분석에 대한 검증이 이루어지고 기후, 정확도 등을 고려한 데이터가 누적되면 영상을 이용한 정밀 모니터링도 가능할 것으로 판단된다.