A dramatic expansion of the worldwide wind power capacity is underway which is critical to an effective mitigation of climate change. However, wind tower infrastructure is susceptible to extreme weather conditions suc...
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A dramatic expansion of the worldwide wind power capacity is underway which is critical to an effective mitigation of climate change. However, wind tower infrastructure is susceptible to extreme weather conditions such as tropical cyclones and thunderstorms. Under the context of global climate changes and intense weather events, it is imperative to assess the impacts of extreme conditions on the susceptibility of the global wind power with important implications on energy security and power system resilience. In this paper, we discuss the necessity and rationality of wind power deployment considering extreme weather perspectives on enhancing the global sustainability, security, economics, and resilience. We assess the vulnerability of wind power to extreme weather events under climate change and present the correlation of wind power proliferation, extreme weather events, and climate change issues. Our results indicate that, if extreme wind speed increases by 20% considering a 50-year return wind speed and load safety factor is changed from 1.35 to 1.7, the initial capital cost of wind unit installation by the end of this century could increase by about 12% because of the higher strength in tropical cyclones. In this period, upward lightning strike will be intensified due to the use of taller wind turbines and higher angular speed of blades. Also, additional storm surges and sea ices will potentially cause higher risks to inland and offshore wind tower structures and foundations because of the continuously rising sea levels. It is confirmed in our discussion that the proliferation of wind power generation would be beneficial despite its vulnerabilities by curbing the use of fossil-based power generation units, mitigating severe carbon emission, and reducing climatic changes and extreme weather events, which could also cause significant structural damages to wind turbines installations globally. The article concludes that it is vital in the scientific community to fur
To reduce the waste of green time as a result of unbalance of non-conflict streams, a method of overlapping phase was introduced. The design and optimization for overlapping phase combination is proposed in the paper....
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As a part of developing an adaptive signal control system using VS-PLUS method for optimal network traffic control, a study was carried out along the Huangshan Road in Hefei, China, to evaluate this system. This paper...
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As a part of developing an adaptive signal control system using VS-PLUS method for optimal network traffic control, a study was carried out along the Huangshan Road in Hefei, China, to evaluate this system. This paper described the study which included field survey about traffic performance; development of trip matrix using an improved Furness method; using the TRANSYT traffic modelling software to find the optimal fixed-time signal plan and VISSIM micro-simulation software to affirm and evaluate the TRANSYT model and to help assess the optimal signal plan; building adaptive frame signal plan and refining and evaluating the plan using VISSIM with VS-PLUS emulator. The results indicated that average delay per vehicle was reduced significantly with consequent improvement in network performance. Adaptive signal control plan was then designed for the VS-PLUS signal control system based on the optimal fixed-time signal plan. Through micro-simulation, it was shown that delay in the adaptive signal control was shortened noticeably than that in the fixed time control. This study has been the very first for this system. Further and more comprehensive studies are expected to follow to fully evaluate and appreciate this system. This study has filled some of the gaps in evaluating the performance of and provided a benchmark for such an adaptive traffic signal control system in a typical urban setting in cities in China. The study has also raised a number of questions in setting the optimal frame plan regarding driver behaviour, safety concerns and tradeoffs between shorter cycles and higher responsiveness to traffic variations.
In this paper, we consider the problem of vehicular positioning enhancement with emerging connected vehicles (CV) technologies. In order to actually describe the scenario, the Interacting Multiple Model (IMM) filter i...
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Vehicular Ad-Hoc Network (VANET) has emerged as an increasingly dominant technology for future connected vehicle and vehicular networks, where the focus of the development of VANET lies in the standardization of messa...
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Fatigue driving might affect the traffic safety when the vehicles are on the cruising state in highway. Trying to solve this problem, this paper uses the movement pattern of the fish to the vehicles fleet, and develop...
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Accuracy is a key factor in high-resolution remote sensing and photogrammetry. The factors that affect accuracy are imaging system errors and data processing errors. Due to the complexity of aerial camera errors, this...
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Accuracy is a key factor in high-resolution remote sensing and photogrammetry. The factors that affect accuracy are imaging system errors and data processing errors. Due to the complexity of aerial camera errors, this paper focuses on the design of digital aerial camera systems and the means to reduce system error and data processing inefficiencies. There are many kinds of digital aerial camera systems at present;however, these systems lack a unified physical model, which ultimately leads to more complicated designs and multi-camera modes. Such a system is complex and costly, as it is easily affected by factors such as vibration and temperature. Thus, the installed accuracy can only reach the millimeter level. Here, we describe a unified physical structure for a digital aerial camera that imitates an out-of-field multi-charge-coupled device (CCD), an in-field multi-CCD, and once-imaging and twice-imaging digital camera systems. This model is referred to as the variable baseline-height ratio spatiotemporal model. The variable ratio allows the opto-mechanical spatial parameters to be linked with height accuracy, thus providing a connection to the surface elevation. The twice-imaging digital camera prototype system and the wideband limb imaging spectrometer provide a transformation prototype from the current multi-rigid once-imaging aerial camera to a single rigid structure. Thus, our research lays a theoretical foundation and prototype references for the construction and industrialization of digital aerial systems.
Intrusion Detection System is a pattern recognition task whose aim is to detect and report the occurrence of abnormal or unknown network behaviors in a given network system being monitored. In this paper, we propose a...
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To reduce the waste of green time as a result of unbalance of non-conflict streams, a method of overlapping phase was introduced. The design and optimization for overlapping phase combination is proposed in the paper....
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To reduce the waste of green time as a result of unbalance of non-conflict streams, a method of overlapping phase was introduced. The design and optimization for overlapping phase combination is proposed in the paper. There are two steps of optimization in the process. Firstly to select a best group among the possible phase combination including overlapping phase by calculating the minimal cycle flow ratio of the group, secondly to use the object of minimum total delay based Particle Swarm optimization approach to obtain optimal green time for each phase. The method is applied at the intersection of Xiuning Road and Hezuohua Road in Hefei, China. It shows that the waste of green time is diminished by overlapping phase. The total delay is reduced in large scale. The result was proved by simulation of Vissim and showed the method is effective in upgrading the traffic signal control program.
Web service selection based on the QoS is still a hot topic in the area of service computing. For the past web service QoS are mostly describe in single data type, this paper present hybrid QoS to describe the web ser...
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Web service selection based on the QoS is still a hot topic in the area of service computing. For the past web service QoS are mostly describe in single data type, this paper present hybrid QoS to describe the web service. The hybrid QoS contains real number type, interval type and language type. The web service selection based on hybrid QoS used the improved TOPSIS method. Experiment results show that the web service selection based on hybrid QoS has higher stability and reliability. Meanwhile, this paper presents the method for service provider to improve their web service by the feedback from web service consumers. Service provider can improve their service by the feedback in order to more and more consumers select their service. Thus the service provider could get greater benefits and increase the competitiveness of their services with other services.
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