In this paper, we propose a numerical method of computing a Hadamard finite-part integral with a non-integral power singularity at an endpoint, that is, a finite part of a divergent integral as a limiting procedure. I...
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For multi-antenna system, the difficulties of preforming spectrum sensing are high sampling rate and hardware cost. To alleviate these problems, we propose a novel utilization of distributed compressive sensing for th...
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In this paper, we propose a numerical method for computing Hadamard finite-part integrals with an integral-power singularity at an endpoint, the part of the divergent integral which is finite as a limiting procedure. ...
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Available information indicates that fatality rate of traffic accidents resulting from the collision of motor vehicles with camels is very high. Consequently, several countries, including the Gulf countries, have fenc...
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Available information indicates that fatality rate of traffic accidents resulting from the collision of motor vehicles with camels is very high. Consequently, several countries, including the Gulf countries, have fenced off their highways to prevent camels from straying onto them. Although, the use of fencing is an effective method in reducing collision of motor vehicles with camels, fences can block camels' movements, and their access to forage and water. An inexpensive and durable crossing technique that is friendlier to vehicles and camels is developed in this research. The system has been designed using the global positioning system (GPS), and a global system for mobile communication (GSM) technology. Lab experiments indicate that the system has a unique capability of being able to monitor and track camels and thus could mitigate the number of accidents involving vehicles and camels.
In this paper, we propose a numerical method of computing an Hadamard finite-part integral, a finite value assigned to a divergent integral, with a non-integral power singularity at the endpoint on a half infinite int...
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This two-part paper investigates the application of artificial intelligence (AI) and in particular machine learning (ML) to the study of wireless propagation channels. In Part I, we introduced AI and ML as well as pro...
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An unmanned aerial vehicle (UAV)-aided mobile edge computing (MEC) framework is proposed, where several UAVs having different trajectories fly over the target area and support the user equipments (UEs) on the ground. ...
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A power divider and a balun with bandpass characteristics are designed and realized with integration of quadruplet filters. Quarter-wave resonators are used as building blocks of the quadruplets so that the entire cir...
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ISBN:
(纸本)9781728112404;9782874870675
A power divider and a balun with bandpass characteristics are designed and realized with integration of quadruplet filters. Quarter-wave resonators are used as building blocks of the quadruplets so that the entire circuits are compact in size. With the aid of coupling matrix synthesis, transmission zeros can be created at designated positions on both sides of the passband at both outputs. Before the layouts of these two three-port circuits are finalized, special attention is paid in electromagnetic simulation to the differential phase responses of the two outputs. Two experimental circuits centred at 2.5 GHz are fabricated and measured. Good agreement between simulation and measurement results validates the design concept.
Historically, the power distribution grid was a passive system with limited control capabilities. Due to its increasing digitalization, this paradigm has shifted: the passive architecture of the power system itself, w...
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Historically, the power distribution grid was a passive system with limited control capabilities. Due to its increasing digitalization, this paradigm has shifted: the passive architecture of the power system itself, which includes cables, lines, and transformers, is extended by a communication infrastructure to become an active distribution grid. This transformation to an active system results from control capabilities that combine the communication and the physical components of the grid. It aims at optimizing, securing, enhancing, or facilitating the power system operation. The combination of power system, communication, and control capabilities is also referred to as a "smart grid". A multitude of different architectures exist to realize such integrated systems. They are often labeled with descriptive terms such as "distributed," "decentralized," "local," or "central." However, the actual meaning of these terms varies considerably within the research *** paper illustrates the conflicting uses of prominent classification terms for the description of smart grid architectures. One source of this inconsistency is that the development of such interconnected systems is not only in the hands of classic power engineering but requires input from neighboring research disciplines such as control theory and automation, information and telecommunication technology, and electronics. This impedes a clear classification of smart grid solutions. Furthermore, this paper proposes a set of well-defined operation architectures specialized for use in power systems. Based on these architectures, this paper defines clear classifiers for the assessment of smart grid solutions. This allows the structural classification and comparison between different smart grid solutions and promotes a mutual understanding between the research disciplines. This paper presents revised parts of Chapters 4.2 and 5.2 of the dissertation of Drayer (Resilient Operation of Distribution Grids with Dis
Three-phase Induction motors are typically used in an increasing variety of applications such as fans, milling machines, transportation, etc. This paper discusses the speed control of the three-phase induction motor a...
Three-phase Induction motors are typically used in an increasing variety of applications such as fans, milling machines, transportation, etc. This paper discusses the speed control of the three-phase induction motor and an associated PI controller. A model of the three-phase induction motor is presented, analyzed and used to demonstrate the effectiveness of the speed controller. The performance of the motor system is carefully examined and compared with and without the PI controller. The unit step response of the speed control loop is characterized by rise time, peak overshoot, settling time and steady state error of 0.0815s, 6.97%, 0.82 and 0.11% respectively. Simulation results show that the speed of the uncontrolled motor changed whereas that of the controlled motor returned quickly to its initial value after the motor is subjected to load changes from 1 pu to 0.5 pu and subsequently to 0.25 pu.
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