• 한국포장학회지
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• 제23권1호
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• pp.37-45
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• 2017

닭가슴살의 품질변화를 실시간으로 모니터링하기 위하여 pH 지시약, AA, 다공성 기재인 $Tyvek^{(R)}$을 이용하여 신선도 인디케이터를 제조하였다. 닭가슴살의 대표적인 지표물질은 TVBN과 $CO_2$이며, 이는 저장기간에 따라 미생물의 증식과 단백질 분해를 통해 증가한다. 닭가슴살 저장실험 결과 미생물 수로 판단한 초기부패단계의 $CO_2$ 농도와 TVBN 발생량은 각각 19%와 23 mg%로 확인되었다. 지표물질 발생량 데이터를 토대로 BCG 및 AA의 농도별 인디케이터를 제조하여 인디케이터 색변화 시뮬레이션을 실시하였다. 그 결과, AA의 함량에 따른 인디케이터의 색변화구간 조절 가능성이 확인되었으며, 제조한 인디케이터 중 "G0.12_A0.5"의 인디케이터가 닭가슴살 초기 부패판정 농도인 TMA 20 mg%에서 육안으로 확인할 수 있는 뚜렷한 색변화를 보였다. 시뮬레이션을 통해 선정된 최적 조성의 인디케이터를 닭가슴살 포장내부에 부착하였으며, $4^{\circ}C$와 $10^{\circ}C$에서 8일동안 닭가슴살의 이화학적 변화와 그에 따른 인디케이터의 색변화를 관찰하였다. 그 결과, TCD 값을 통해 판단된 인디케이터의 색변화 발생일이 각 온도별 닭가슴살 초기부패판정일과 잘 부합하였으며, 이를 통해 시뮬레이션의 신뢰성을 확보할 수 있는 것으로 확인되었다. 본 연구 결과는 저장 중 닭가슴살의 품질변화를 제조한 인디케이터의 포장 내 부착을 통하여 감지하고 실시간 신선도 판단이 가능할 것으로 사료된다.

• 대한전기학회논문지:전기물성ㆍ응용부문C
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• 제50권2호
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• pp.60-64
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• 2001

The degradation process of silicone rubber was investigated by leakage current monitoring in Inclined-Plane method. DAS (Data Acquisition System) with 12-bit, 8-channel A/D converter was prepared. Average current, cumulative charge, current waveform and the number of peak pulses were measured on-line. And, FFT (Fast Fourier Transform) analysis was performed with stored current waveform. Besides, maximum erosion depth was measured in order to use as the indicator of the degradation process. So, the results of leakage current components and maximum erosion depth measurements were compared to find one or more components which have trends of changing similarly to that of erosion process. The result suggests that the ratio of peak current to r.m.s. current, harmonic contents and the number of peak pulses are well corresponding with the degradation process.

• 한국전산구조공학회:학술대회논문집
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• 한국전산구조공학회 2004년도 가을 학술발표회 논문집
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• pp.135-142
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• 2004

Two-step identification approach for effective bridge health monitoring is proposed to alleviate the issues associated with many unknown parameters faced in the real structures and to improve the accuracy in the estimate results. It is suitable for on-line monitoring scheme, since the damage assessment is not always needed to be carried out whereas the alarming for damages is to be continuously monitored. In the first step for screening potential damaged members, damage indicator method based on modal strain energy, probabilistic neural networks and the conventional neural networks using grouping technique are used and then the conventional neural network technique is utilized for damage assessment on the screened members in the second step. The proposed methods are verified through a field test on the northern-most span of old Hannam Grand Bridge.

• 한국산림과학회지
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• 제95권5호
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• pp.605-613
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• 2006

The goal of this study was to propose building strategies of web-based national park monitoring system (WNPMS) using geographic information analysis system. To accomplish this study, at first, this study selected and made integrated management indicators considering physical, ecological, and socio-psychological carrying capacity in national park. Secondly, this study built up an integrated management this system with statistical analysis program for execution of various multivariate analysis and spatial analysis. Finally, WNPMS could identify the relationship among visitors, natural resources, and recreation facilities in national park, and forecast the future management status of each national park in Korea. There results of this study will contribute to prevent the damage of natural resources and facilities, improve visitor's satisfaction, prevent an excess of carrying capacity at national park, and established tailored management strategies of each national park.

• Nuclear Engineering and Technology
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• 제51권3호
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• pp.867-876
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• 2019

Second harmonic generation using nonlinear ultrasonic waves have been shown to be an early indicator of possible fatigue damage in nuclear power plant components. This technique relies on measuring amplitudes, making it highly susceptible to variations in transducer coupling and instrumentation. This paper proposes an experimental procedure for in-situ surface wave nonlinear ultrasound measurements on specimen with permanently mounted transducers under high cycle fatigue loading without interrupting the experiment. It allows continuous monitoring and minimizes variation due to transducer coupling. Moreover, relations describing the effects of the measurement system nonlinearity including the effects of the material transfer function on the measured nonlinearity parameter are derived. An in-situ high cycle fatigue test was conducted using two 304 stainless steel specimens with two different excitation frequencies. A comprehensive analysis of the nonlinear sources, which result in variations in the measured nonlinearity parameters, was performed and the effects of the system nonlinearities are explained and identified. In both specimens, monotonic trend was observed in nonlinear parameter when the value of fundamental amplitude was not changing.

• 한국멀티미디어학회논문지
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• 제24권12호
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• pp.1682-1692
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• 2021

Digital Twin, one of the core technologies of the Fourth Industrial Revolution, is attracting attention as a very suitable technology for disaster monitoring such as fires and earthquakes. In this paper, we implement a system equipped with UWB RTLS(Ultra-Wideband Real Time Location System), real-time remote control, and video streaming, which are element technologies for disaster monitoring digital twin. Since the proposed system structure is based on a cloud server, the actual location of the UWB indoor positioning-based client is transmitted to the user device in real time and stored on the cloud server for statistical and data analysis. In addition, we demonstrate through experiments that outliers occurs when the value of RSSI(Received Signal Strength Indicator) decreases due to communication collisions between UWB Tags, and propose an RSSI outlier correction algorithm to solve this problem.

• 보존과학연구
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• 통권33호
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• pp.85-97
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• 2012

이 연구는 문화재 보존환경 간이 측정법의 적용 및 활용 가능성 검토를 위한 기초연구로 자외선 지시카드의 성능을 검증하고 이를 바탕으로 일부 전시조명에서의 적용성을 검토하였다. 5종의 자외선 지시카드를 대상으로 온 습도 환경 및 자외선램프에 의한 반응도를 살펴본 결과, L 카드와 K 카드는 반응도가 매우 낮아서 환경 측정용으로 부적합한 것으로 나타났으며, M 카드는 습도의 영향을 받는 것으로 조사되었다. 그러나 S 카드는 반응성이 가장 좋고 자외선 저 방사 환경에서도 민감한 색도 변화를 보였다. S 카드를 주요 전시조명으로 활용되는 광원에서 노출평가를 실시한 결과, 자외선량이 높은 할로겐램프와 형광램프에서 큰 색차 값과 육안상의 뚜렷한 색변화를 관찰할 수 있었다. 따라서 자외선 지시카드 중 S 카드가 문화재의 전시조명 환경 점검 및 관리에 있어 간편하게 활용할 수 있을 것이다.

• 한국응급구조학회지
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• 제16권3호
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• pp.9-18
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• 2012

Purpose : The purpose of this study was to determine the changes that occur due to the real-time monitoring of paddle pressures which has an important influence on the defibrillation success rate in defibrillation treatment known as the only treatment for cardiac arrest patients with VF. Methods : 40 people participated in the cardiac arrest simulation training and played the role of the defibrillation operator. Investigators measured the pressure of paddle while defibrillating by using instrument which was developed by the investigator. Results : Through real-time monitoring of the paddle pressures of defibrillator by indicator, the front sternum paddle showed a 77.5% success rate and the apex paddle showed a 40% success rate. While the values without monitoring the paddle pressures, the front sternum paddle showed a 51% success rate and the apex paddle showed a 20% success rate. These experiment revealed statistically significant(p <.001) low success rate. Conclusion : The method of monitoring the paddle pressures during defibrillation showed that the paddle can be precisely gripped. The success rate of paddle pressures is significantly correlated with height, weight and grip strength.

• 대한원격탐사학회:학술대회논문집
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• 대한원격탐사학회 2002년도 Proceedings of International Symposium on Remote Sensing
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• pp.757-765
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• 2002

This paper analyzes three theories for land degradation assessment and internationl/domestic methods for land degradation monitoring and assessment. Under the guidance of absolute degradation thought, this paper proposes the technological framework for monitoring and appraising cultivated land degradation based on the 3S technique. We can apply 3S technique and analyze the nature, the environmental, the social, and the economic elements which influence the land utilization and degradation synthetically, to set up the indicator system of the cultivated land degradation monitoring and assessment based on 3S technique; to propose the degradation information extraction methods based on 3S technique; to create the quantitative assessment model and method for land degradation; to analyze the ecological environment response of land use and degradation quantitatively; and to propose the measure, policy and suggestion for solving the land degradation problem from the point of view of land utilization.

• 지질공학
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• 제16권2호
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• pp.153-159
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• 2006

수질오염이 심각해지면서 수자원의 이용을 어렵게 하며 수자원의 관리를 위해 사용되는 시간적 기술적 경제적 부하도 증대시키고 있다. 그러므로 본 논문에서는 간단하고 신속하게 수질을 파악 할 수 있는 미규제 수질인자($E_{260}$과 입자수)를 도입하여 정수공정의 효율성을 평가하고자 하였다. 탁도저감을 목적으로 주입하는 알루미늄에 의해 용존성 알루미늄의 잔존량이 증가하는 경향이 있으므로 탁도 모니터링만으로는 안전한 수질을 기대하기가 어려움을 명확히 알 수 있었으며, 잔존알루미늄의 농도를 모니터링 하는 대신 간단 신속하게 분석할 수 있는 $E_{260}$인자를 이용할 수 있음을 밝혔다. 또한 탁도 뿐만 아니라 용존성 비소화합물의 모니터링에도 $E_{260}$은 효율적으로 사용되었다. 수처리공정의 효율을 개선하기 위해 수처리제의 교환을 고려할 때에도 탁도 자료만으로는 질적인 개선정도를 평가하기 어려웠으나, 수중의 입자를 계수함으로써 재선정도의 평가가 용이해져 적절한 수처리제의 선택을 가능하게 하므로 수질개선과 경제적 절약을 모두 달성하게 하였다. 따라서 효율적인 정수처리 뿐만 아니라 수자원의 관리 측면에서도 이들 인자는 매우 유용하게 사용될 수 있을 것으로 기대된다.