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The subjective Chinese speech intelligibility evaluation experiments and objective speech transmission index STIPA measurements were respectively carried out under a total of 234 simulated transmission conditions. The relationship curve between Chinese intelligibility scores and STIPA was established and compared with the standard reference curves given in IEC 60268-16 2011. It is found that remarkable...
In the hardware-in-the-loop simulation system, simulation authenticity mainly depends on whether the hardware-in-the-loop simulation environment is verisimilitude, besides depends on qualified performance of the test object. This paper introduces how to choose the simulation environment device to ensure closed loop of hardware-in-the-loop simulation according to the characteristic of test object's...
A Legendre pseudo spectral combination algorithm introduced by the theory of differential flatness is proposed, which transforms the unmanned aerial vehicles path planning problem into an optimal control problem. The vehicles kinematics state equations are built, and the optimal control problem which uses the equations as constraints and the shortest flight time as the cost is also built. By the differential...
In this paper, the measurements of 2 × 2 MIMO channel were performed at 2.6 GHz with 20 MHz bandwidth along the Harbin-Dalian passenger dedicated railway line. To improve the accuracy of multipath searching, we propose a multipath components (MCPs) extraction method based on this measurement, using the statistical properties of the data to reduce dependence on certain specific parameter. Numerical...
Long Term Evolution (LTE) system used in High-Speed Railway (HSR) has gained the increasing attention therefore the measurements and analysis of the broadband wireless channel for the HSR communication is urgently needed. This paper focuses on the special fading characteristics of viaduct and hilly terrain scenarios based on the extensive and practical multiple input multiple output (MIMO) measurements...
The dramatic development of high speed railway (HSR) has spurred great interest in extensive studies on the fading characteristics of the radio channel in all the relevant scenarios. Approved by the Ministry of Railways of China, single input single output (SISO) measurements were performed at 2.6 GHz with 40 MHz bandwidth along the Harbin-Dalian passenger dedicated railway line. In this paper, we...
In order to meet the requirements of on-line monitoring for 10kV high voltage switchgear, a design of data acquisition, processing and communication based on a multilayer distributed structure is proposed. This system is composed of data acquisition and communication unit, distributed monitoring unit and remote monitoring terminal, with Ethernet communication scheme to enhance transmission rate and...
Karst depressions represent important sinks for sediment, and such sediment can provide a valuable record of the impact of environmental change on soil erosion rates. However, the sediment dynamics of karst depressions are not well understood. This contribution reports a study of the small catchment of a karst depression in Southwest China, with a drainage area of 0.054 km2, aimed at using the sediment...
Fast-flux is a Domain Name System (DNS) technique used by botnets to organise compromised hosts into a high-availability, load-balancing network that is similar to Content Delivery Networks (CDNs). Fast-Flux Service Networks (FFSNs) are usually used as proxies of phishing websites and malwares, and hide upstream servers that host actual content. In this paper, by analysing recursive DNS traffic, we...
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