A mixed-potential integral equation (MPIE) is formulated for the electric and magnetic currents on a multilayered aperture-coupled patch antenna, The integral equation is solved via the method of moments (MoM) using s...
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A mixed-potential integral equation (MPIE) is formulated for the electric and magnetic currents on a multilayered aperture-coupled patch antenna, The integral equation is solved via the method of moments (MoM) using subsectional basis functions that allow the analysis of nonrectangular aperture and patch shapes, The input impedance and radiation efficiency of various aperture-coupled elements are calculated using the proposed technique and compared to measured results, The advantages and disadvantages of several aperture and patch configurations are discussed, and six methods of numerically de-embedding the element's input impedance are compared.
Distributed event-based systems are used to detect meaningful events with low latency in high data-rate event streams that occur in surveillance, sports, finances, etc. However, both known approaches to dealing with t...
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Distributed event-based systems are used to detect meaningful events with low latency in high data-rate event streams that occur in surveillance, sports, finances, etc. However, both known approaches to dealing with the predominant out-of-order event arrival at the distributed detectors have their shortcomings: buffering approaches introduce latencies for event ordering, and stream revision approaches may result in system overloads due to unbounded retraction cascades. This article presents an adaptive speculative processing technique for out-of-order event streams that enhances typical buffering approaches. In contrast to other stream revision approaches developed so far, our novel technique encapsulates the event detector, uses the buffering technique to delay events but also speculatively processes a portion of it, and adapts the degree of speculation at runtime to fit the available system resources so that detection latency becomes minimal. Our technique outperforms known approaches on both synthetical data and real sensor data from a realtime locating system (RTLS) with several thousands of out-of-order sensor events per second. Speculative buffering exploits system resources and reduces latency by 40% on average.
The commenter asserts that it would be dangerous to take computed local values of specific absorption rate (SAR) seriously and use them as a basis for patient treatment, as suggested by J.-Y. Chen and O.P. Gandhi (ibi...
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The commenter asserts that it would be dangerous to take computed local values of specific absorption rate (SAR) seriously and use them as a basis for patient treatment, as suggested by J.-Y. Chen and O.P. Gandhi (ibid., vol.39, p.209-16, Mar. 1992) in the above-titled paper. He lists 11 reasons that support his assertion. The authors refute the commenter's claims, based on his use of simple models and whole-body SAR or average SAR in large regions of the body.< >
The pinch-off voltage of several commercial silicon MOSFET types was measured at room temperature and at 4.2K. Typically, room temperature and 4.2K values differed in magnitude by approximately one volt.
The pinch-off voltage of several commercial silicon MOSFET types was measured at room temperature and at 4.2K. Typically, room temperature and 4.2K values differed in magnitude by approximately one volt.
The ongoing digital transformation of industry is most clearly reflected in the increasing collection and analysis of data from various sources. Among these are sensor equipped machinery, telemetry in logistics or aud...
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The ongoing digital transformation of industry is most clearly reflected in the increasing collection and analysis of data from various sources. Among these are sensor equipped machinery, telemetry in logistics or audiovisually monitored production floors. In order to utilize the data, e. g., to predict machinery malfunctions, its technically smooth consolidation is crucial. Therefore, numerous data interchange formats, protocols and middleware emerged over the past years. However, until today there is no gold standard technology stack for industrial data analysis, for multiple reasons, including the applications’ heterogeneity. In this work, we present a software library which aims at decoupling messaging protocols and patterns from their implementation to overcome incompatibilities and, thus, facilitate data consolidation for software engineers. Moreover, we show how to use the library for rapidly modeling distributed cyber-physical systems using an integrated schema generation mechanism. Based on one real-world and one synthetic use case, we evaluate the library's applicability, discuss open issues and outline planned features.
The ease of software development, maintenance, commissioning and reconfiguration is paramount in industrial systems, because these must be adaptable to changes in customer demand and the evolution of production assets...
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The ease of software development, maintenance, commissioning and reconfiguration is paramount in industrial systems, because these must be adaptable to changes in customer demand and the evolution of production assets. Such adaptations are a core motivator in the fourth industrial revolution. Additionally, software applications should be able to communicate over the logical and geographical borders of production plants, regardless of software platforms and vendors. However, these issues remains unaddressed in current software tools, although a solution is reachable with a proper software toolkit. As a solution, this article introduces such a toolkit to support the development of industrial software systems. The toolkit implements a communication stack with both a communication protocol and an information model. The long-term goal is to enable all communication in industrial plants with such a toolkit regardless of software products, vendors and platforms. Additionally, the toolkit provides auxiliary tools to help in the development of industrial software, such as services to provide historical data for simulation purposes. As an outcome, the toolkit provides insight about the development needs of industrial communications.
Low- and high-frequency measurements are presented of five differently shaped targets: the NASA almond, ogive, double ogive, cone-sphere, and cone-sphere with gap. These were measured from 700 MHz to 16 GHz. The metal...
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Low- and high-frequency measurements are presented of five differently shaped targets: the NASA almond, ogive, double ogive, cone-sphere, and cone-sphere with gap. These were measured from 700 MHz to 16 GHz. The metallic targets are made of aluminum, and were cut by a numerically controlled mill to maintain the surface precision. Except for the almond target, all the targets were made in two parts and joined by sleeves and screws. The measurements are computational electromagnetics (CEM) validation measurements for the Electromagnetic Code Consortium (EMCC).< >
The author gives another proof for the conjecture given that it has been pointed out by P.K. Rajan and H.C. Ready that the conjecture was first proven true in a book by M. Marden (1949)
The author gives another proof for the conjecture given that it has been pointed out by P.K. Rajan and H.C. Ready that the conjecture was first proven true in a book by M. Marden (1949)
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