Performance analysis of multiple‐input multiple‐output relay networks based impulse radio ultra‐wideband

In this paper, we study the performance of time hopping pulse position modulation for impulse radio ultra‐wideband. We consider relay network applying decode‐and‐forward protocol. The channels between nodes adopt the IEEE 802.15.4a norms. The bit error rate performance is analyzed considering the effect of interference. Our results show significant improvement due to the diversity gain provided by the relay nodes. However, the performance is limited when multiple access interference (MAI) is present. To combat the MAI effect and further improve the detection reliability, we propose to use antenna selection at the relay. The relay receiver is assumed to be equipped with multiple antennas, and only the best antenna is selected. This is shown to improve the performance in the presence of MAI and improve the diversity gain.Copyright © 2013 John Wiley & Sons, Ltd.     

A vehicle plate recognition system based on deep learning algorithms

Multimedia Tools and Applications - In modern life, the massive number of vehicles makes it hard for a human being to process its related information. So, it is important to build an automatic...     

Dispersion and sedimentation of titanium dioxide nanoparticles in freshwater algae and daphnia aquatic culture media in the presence of arsenate

Little information is available on Titanium dioxide nanoparticles (nTiO₂) behavior in different culture media for aquatic organisms. This study aimed to accurately evaluate nTiO₂ dispersion and sedimentation in common freshwater algae (BG-11) and daphnia aquatic (SM7) culture media. We additionally investigated potential mechanisms of nTiO₂ stability under arsenate influence. Results showed that high ionic strength in culture media was probably a key reason for the acute nTiO₂ agglomeration found. Additionally, the hydrodynamic size of nTiO₂ suspension in the presence of arsenate was significantly larger, increasing with arsenate concentration in ultrapure water. Conversely, the hydrodynamic size in BG-11 and SM7 decreased with arsenate concentration. The nTiO₂ sedimentation rate increased significantly with arsenate concentration in ultrapure water but significantly decreased in BG-11 and SM7 culture media. Many nTiO₂ remained suspended after initial rapid sedimentation and the slight sedimentation that occurred in the subsequent 24 h, suggesting that algae and daphnia within the water column will be exposed to small nanoparticle aggregates for a long period of time. Such nTiO₂ behavior, especially in the presence of arsenate, requires more consideration than the different toxicological results reported in literature.     

Large-scale channel characterization at 28 GHz on a university campus in the United Arab Emirates

Telecommunication Systems - Millimeter wave (mm-wave) communication is one of the key enabling technologies for meeting the requirements of the fifth generation (5G) wireless communication systems....     

Game theoretic modeling of security and trust relationship in cyberspace

Today, online network services have evolved as the highest‐emergent medium, enabling various online activities to be lucrative. However, these lucrative activities also bring new forms of privacy threats to the community. In a reliable e‐business service, users should be able to trust the providers of the service to protect their customers' privacy. The service providers should not risk the personal and private information about their customers in cyberspace. There is an economic gain for a business provider when users trust the service provider. Despite those benefits, cyber security concern is the main reason some large organization may go bankrupted. Unfortunately, attackers may attempt to breach a provider's database and expose customers' private information. Therefore, in this paper, we propose a game theoretic framework for security and trust relationship in cyberspace for users, service providers, and attackers. Mathematical proofs and evaluations support our model. Service providers may use the model to see how important and dissuasive against attackers is when investing in cybersecurity. Copyright © 2016 John Wiley & Sons, Ltd.     

Effect of High-Temperature Air Exposure on the Microstructure and Mechanical Properties of β-Ti Honeycomb Sandwich Panels

Metallurgical and Materials Transactions A - Ti-β-21S honeycomb sandwich panels are used for aeroengine exhaust components due to its light density, high specific strength, and great...     

太谷县庞庄水库改建的必要性

文中论述了太谷县庞庄水库在工程建设上存在的主要问题，它们是：(1)防洪标准迭不到国家规范SL252—2000的要求；(2)浆砌石坝体质量差；(3)坝基、坝体及绕坝渗漏严重；(4)坝项有较多裂缝。基于以上情况，文中揭示了改建庞庄水库的必要性。