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Valcarce A.,TriaGnoSys GmbH | Wagen J.-F.,BME | Gorce J.-M.,INSA
IEEE Vehicular Technology Magazine | Year: 2011

Owing to its direct applicability in solving problems of the telecommunications industry, propagation prediction for a long time has been an important area of research and development. Because of the increasing complexity of wireless networks, growing number of smaller cells, and higher intercell interference, software tools that aid in network optimization are necessary. Therefore, in the study of particular environments, where wireless networks are deployed, deterministic propagation models play an important role. © 2011 IEEE. Source


He W.,BME
Sheng wu yi xue gong cheng xue za zhi = Journal of biomedical engineering = Shengwu yixue gongchengxue zazhi | Year: 2012

Phased array transducers are very attractive because the beam generated by the arrays can be electronically focused and steered. The present work characterizes far-field 2D properties of phased array system by functions that are deduced from rectangle source, rectangle line array and phased array based on point source. Results are presented for the distribution of ultrasound intensity on plane xoz and on x-axis by simulation using numerical calculation. It is shown that the shape of response of rectangle line array is modulated by the single array element. It is also demonstrated that the delay time of phased array is the key to steer the beam, sacrificing the value of main lobe and increasing the number of side lobes. Source


Nagy L.,BME
2015 9th European Conference on Antennas and Propagation, EuCAP 2015 | Year: 2015

Collision avoidance systems for Unmanned Aerial Vehicle (UAV) use ultrasonic or radiowave radar equipment for target detection. In direction-of-arrival (DOA) antenna array estimation, the direction of a signal is usually assumed to be a point. The article analyze the Uniform Linear Array(ULA) and Minimum Redundance Array (MRA) beamforming arrays taken into account the mutual coupling between the antenna array elements. Simulation is performed for real antenna arrays and is shown that the sidelobe level is increasing for each array but for MRA the symmetry also distorted. Therefore for adaptive antenna applications is especially important the compensation of mutual coupling of antennas. Conventional beamformer (BF), Capon (CP), MUSIC and sample matrix inversion (SMI) based on particle filter are investigated and compared. In this paper, we consider aerial vehicle backscatter using ray tracing method and DOA estimation when the signal sources are distributed. Model for distributed source is proposed, and estimation methods are considered under this models. © 2015 EurAAP. Source


Peter T.,BME | Szabo K.,Hungarian Academy of Sciences
Periodica Polytechnica Transportation Engineering | Year: 2012

In the field of air trac control it is a significant challenge and source of risk that often maximal performance load is charged against the regions of the airspace. Another problem is the fact that if the air trac control is inecient, it brings about substantial excess costs, as well. The article gives a new network model for the analysis of large air trac networks and provides new opportunities also in the area of control theory. It reviews the relevant macroscopic modeling techniques and the application of the class of positive systems. © Periodica Polytechnica 2012. Source


News Article | August 23, 2016
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Product AnnouncementAMSBIO has introduced Cultrex Organoid Progenitor Cells that have been derived from normal, healthy mouse small intestine tissue and are continuously cultured using Reduced Growth Factor BME R1 and BME 2. Contributed Author: AMSBIO

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