scholarly journals Application of Optical Flow Technique and Photogrammetry for Rockfall Dynamics: A Case Study on a Field Test

2021 ◽  
Vol 13 (20) ◽  
pp. 4124
Author(s):  
Dong-Hyun Kim ◽  
Ivan Gratchev
Keyword(s):  
Optical Flow ◽  
Dynamic Behavior ◽  
Monitoring System ◽  
Field Test ◽  
Current Approach ◽  
Tracking Algorithm ◽  
Motion Data ◽  
Slope Monitoring

Optical flow is a vision-based approach that is used for tracking the movement of objects. This robust technique can be an effective tool for determining the source of failures on slope surfaces, including the dynamic behavior of rockfall. However, optical flow-based measurement still remains an issue as the data from optical flow algorithms can be affected by the varied photographing environment, such as weather and illuminations. To address such problems, this paper presents an optical flow-based tracking algorithm that can be employed to extract motion data from video records for slope monitoring. Additionally, a workflow combined with photogrammetry and the optical flow technique has been proposed for producing highly accurate estimations of rockfall motion. The effectiveness of the proposed approach has been evaluated with the dataset obtained from a photogrammetry survey of field rockfall tests performed by the authors in 2015. The results show that the workflow adopted in this study can be suitable to identify rockfall events overtime in a slope monitoring system. The limitations of the current approach are also discussed.

Performance Assessment Using a Field Test of a Short-Period Monitoring System: Tun Bridge Case Study

2019 ◽  
Vol 29 (4) ◽  
pp. 600-612 ◽  
Author(s):  
Mosbeh R. Kaloop ◽  
Kyoung-Ho Kim ◽  
Mohamed Elsharawy ◽  
Fawzi Zarzoura ◽  
Jong Wan Hu
Keyword(s):  
Performance Assessment ◽  
Monitoring System ◽  
Field Test ◽  
Short Period

Effect of unsupported sleepers on dynamic behavior of running vehicles and ride comfort index

2021 ◽  
pp. 095440622198937
Author(s):  
Mojtaba Azizi ◽  
Majid Shahravi ◽  
Jabbar-Ali Zakeri
Keyword(s):  
Numerical Model ◽  
Dynamic Behavior ◽  
Multibody Dynamics ◽  
Field Test ◽  
Ride Comfort ◽  
Vehicle Speed ◽  
Comfort Index ◽  
Railway Industry ◽  
Flexible Track ◽  
Train Speed

Nowadays, with various advancements in the railway industry and increasing speed of trains, the design of railway tracks and vehicles has become vitally important. One of the frequent problems of ballasted tracks is the existence of unsupported sleepers. This phenomenon occurs due to the lack of ballast underneath the sleepers. Here, a model is presented, in which a flexible track model in a multibody dynamics program is developed, in order to study the dynamic behavior of a vehicle. By utilizing the model, it is feasible to simulate unsupported sleepers on the flexible track including rail, sleeper, and ballast components. In order to verify the results of numerical model, a field test is performed. Findings indicate that, in the case of a single unsupported sleeper through the track, the ride comfort index increased by 100% after increasing the train speed from 30 to 110 km/h. Moreover, when it is needed to have ride comfort index improvement over the uncomfortable level, the vehicle speed should be less than 70 km/h and 50 km/h for tracks with one unsupported sleeper and two unsupported sleepers, respectively.

scholarly journals Wearable Wireless Physiological Monitoring System Based on Multi-Sensor

Electronics ◽  
2021 ◽  
Vol 10 (9) ◽  
pp. 986
Author(s):  
Hongru Li ◽  
Guiling Sun ◽  
Yue Li ◽  
Runzhuo Yang
Keyword(s):  
Monitoring System ◽  
Health Management ◽  
Wearable Technology ◽  
Physiological Monitoring ◽  
Motion Data ◽  
Low Load ◽  
Measure Heart Rate ◽  
Body Surface Temperature ◽  
Continuous Work

The purpose of wearable technology is to use multimedia, sensors, and wireless communication to integrate specific technology into user clothes or accessories. With the help of various sensors, the physiological monitoring system can collect, process, and transmit physiological signals without causing damage. Wearable technology has been widely used in patient monitoring and people’s health management because of its low-load, mobile, and easy-to-use characteristics, and it supports long-term continuous work and can carry out wireless transmissions. In this paper, we established a Wi-Fi-based physiological monitoring system that can accurately measure heart rate, body surface temperature, and motion data and can quickly detect and alert the user about abnormal heart rates.

scholarly journals Assessing the Capacity of Adaptive Policy Pathways to Adapt on Time by Mapping Trigger Values to Their Outcomes

2019 ◽  
Vol 11 (6) ◽  
pp. 1716 ◽  
Author(s):  
Luciano Raso ◽  
Jan Kwakkel ◽  
Jos Timmermans
Keyword(s):  
Monitoring System ◽  
Decision Makers ◽  
Level Of Confidence ◽  
Adaptive Policy ◽  
Misclassification Errors ◽  
The Future ◽  
Adaptive Action ◽  
The Face

Climate change raises serious concerns for policymakers that want to ensure the success of long-term policies. To guarantee satisfactory decisions in the face of deep uncertainties, adaptive policy pathways might be used. Adaptive policy pathways are designed to take actions according to how the future will actually unfold. In adaptive pathways, a monitoring system collects the evidence required for activating the next adaptive action. This monitoring system is made of signposts and triggers. Signposts are indicators that track the performance of the pathway. When signposts reach pre-specified trigger values, the next action on the pathway is implemented. The effectiveness of the monitoring system is pivotal to the success of adaptive policy pathways, therefore the decision-makers would like to have sufficient confidence about the future capacity to adapt on time. “On time” means activating the next action on a pathway neither so early that it incurs unnecessary costs, nor so late that it incurs avoidable damages. In this paper, we show how mapping the relations between triggers and the probability of misclassification errors inform the level of confidence that a monitoring system for adaptive policy pathways can provide. Specifically, we present the “trigger-probability” mapping and the “trigger-consequences” mappings. The former mapping displays the interplay between trigger values for a given signpost and the level of confidence regarding whether change occurs and adaptation is needed. The latter mapping displays the interplay between trigger values for a given signpost and the consequences of misclassification errors for both adapting the policy or not. In a case study, we illustrate how these mappings can be used to test the effectiveness of a monitoring system, and how they can be integrated into the process of designing an adaptive policy.

scholarly journals Member States’ social security agreements with India

2018 ◽  
Vol 20 (2) ◽  
pp. 173-187
Author(s):  
Pauline Melin
Keyword(s):  
Social Security ◽  
European Commission ◽  
Current Approach ◽  
Legal Analysis ◽  
The European Union ◽  
Member States ◽  
Bilateral Agreements ◽  
Country Case Study ◽  
The Eu

In a 2012 Communication, the European Commission described the current approach to social security coordination with third countries as ‘patchy’. The European Commission proposed to address that patchiness by developing a common EU approach to social security coordination with third countries whereby the Member States would cooperate more with each other when concluding bilateral agreements with third countries. This article aims to explore the policy agenda of the European Commission in that field by conducting a comparative legal analysis of the Member States’ bilateral agreements with India. The idea behind the comparative legal analysis is to determine whether (1) there are common grounds between the Member States’ approaches, and (2) based on these common grounds, it is possible to suggest a common EU approach. India is taken as a third-country case study due to its labour migration and investment potential for the European Union. In addition, there are currently 12 Member State bilateral agreements with India and no instrument at the EU level on social security coordination with India. Therefore, there is a potential need for a common EU approach to social security coordination with India. Based on the comparative legal analysis of the Member States’ bilateral agreements with India, this article ends by outlining the content of a potential future common EU approach.

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