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Electromagnetic analysis of antennas in complex scenarios require accurate numerical modelling solvers. A fundamental requirement to achieve truthful results is the accurate representation/modelling of the source antenna. However, in many practical cases a full-wave representation of the physical antenna is either unfeasible or unavailable in the format required by the desired computational electromagnetic...
Recent years have witnessed two major trends in the development of complex real-time embedded systems. First, to reduce cost and enhance flexibility, multiple systems are sharing common computing platforms via virtualization technology, instead of being deployed separately on physically isolated hosts. Second, multicore processors are increasingly being used in real-time systems. The integration of...
In spite of the existing protection limits and despite the fact that no research results have proven any health effects below these limits, the public fears towards electromagnetic fields, mobile telephony and the radiofrequencies used, remain important. The EMF exposure from wireless communication systems and networks is often cited as a major cause of public concern and is frequently given considerable...
We developed a near-field coupling communication (NFCC) technology that uses the surface of the human body as a data transmission path in the MHz band. It is important to assess the loss of signal propagation on the human body to design a “touch and connect” form of stable NFCC links. We measured the signal propagation characteristics on a phantom equivalent to the human body with an electrically...
This study aims to present the effectiveness evaluation of job-shop scheduling based on TOC concept under demand variation using simulation technique. Two schedule performance measurements under uncertainty, schedule robustness and performance, are used in comparing the performance of schedule based on TOC and traditional method (minimizing Cmax). Simulation test scenarios are carried out by applying...
This paper investigates the down-converted mixer verification using the measured X-parameter in future system-level simulation. The X-parameter measurement system utilizing Agilent's nonlinear vector network analyzer (NVNA) and the external RF signal generator can provide the desired stimulus to device under test (DUT) at the specified port in order to measure and respond to the non-linear DUT characteristic...
The higher data rate in coded MIMO systems needs higher performance and lower computational complexity. This paper proposes a method to improve the performance and reduce the computational complexity in coded MIMO system, such as IEEE 802.11ac. The proposed scheme based on log likelihood ratio with QRM-MLD (QRM-MLD-LLR) needs to expand the estimated channel matrix H by MMSE scheme firstly, and use...
Magnetic gears are becoming attractive since they offer advantages such as low vibration and acoustic noise, and low maintenance operation in comparison with conventional mechanical gears. Planetary type magnetic gears, especially, have larger transmission torque than the other types. Therefore, the planetary type magnetic gears are expected to be put into practical use. In this paper, first, torque...
As a new kind of dispensing technology, jetting dispensing has a broad application prospect. The dispenser driven by two piezoelectric stacks can realize high frequency and nano dispensing to some certain viscosity of adhesive. In order to analyze the dynamic character of the needle, The model of the dispenser is established, and simulated with Matlab. Then two piezoelectric stacks' input voltages...
Modern mobile devices comprise multiple interfaces for heterogeneous network technologies. However, currently implemented mechanisms to decide which one(s) to use and distribute application flows accordingly (i.e., solving the multihomed flow management problem, MFM) are rather coarse and do not leverage the opportunities. A user-centric quality-aware (QA) MFM has been proposed which optimises network...
Large crowds at music festivals or other mass events create challenging environments for traditional infrastructure based wireless networks. Mobile devices carried by the attendees produce large amounts of network traffic that can result in network outage or serious delays. Opportunistic networks may offer solutions to enable communication between attendees and/or organizers through direct communication...
The state-of-the-art embedded systems are adopting multicore processors as multicore architecture provides high performance and better supports for computation intensive applications. Although cache improves the overall performance, designing multicore embedded systems with multilevel caches is a great challenge. Caches make thermal constraint crucial; parallel thread execution difficult; and timing...
The peer-to-peer (P2P) communication model has gained an enormous research interest in the last few years due to its promising properties (e.g., decentralization, self-organization, scalability, etc.) to build large scale distributed applications. However, the P2P systems are characterized by their dynamic behavior as peers can frequently join and leave the network. This property makes the data availability...
With the rise of the user base of smartphones, the cellular networks are facing increasing uplink signalling traffic pressure caused mainly by the soaring background traffic of smartphone applications. Therefore, this paper studies the LTE radio resource control (RRC) state transition, which is highly related to the amount of signalling traffic, caused by the background traffic. Firstly, we propose...
Wireless networks today are partially being formed by nodes (e.g. Internet access points, smartphones, femtocells)that are owned and carried by humans. In such scenarios where several strangers are expected to interact for the sake of robust data transmission, trust and reputation are of vital importance. As such, User Centric Networks require well-defined trust metrics in order to ensure the robustness...
Due to the poor efficiencies of many linear loads advanced power electronics based technologies are being introduced in residential, commercial and industrial applications to help in reducing the electrical consumption and increasing power control capabilities. This proliferation of nonlinear loads increases concerns of various power quality issues related to the use of such devices in power systems...
Multiuser voice conferencing platforms are more and more popular. Internet bandwidth is becoming very accessible, what makes voice over IP used on an everyday basis. Being able to communicate with multiple people at the same time can be beneficial, but on the other hand increases the need of coordination mechanisms. Determining a moderation scheme which is fair and efficient is not a trivial problem...
This paper reports some of the findings in a project at Loughborough University in the UK. An objective of the work has been to create a pass band square spiral Frequency Selective Surface (FSS) onto waveguides attached on walls to increase productivity and efficiency through enhancing received signal power. The FSS is simulated by Computer Simulation Technology (CST) Microwave Studio (MWS). Remcom...
The aim of this paper is to show the methodology used by the Environment Protection Agency (ARPA) of the Aosta Valley for evaluating the electromagnetic impact due to high voltage overhead lines which cross the region, with regards to public exposure. Simulation and inspections have been used to identify the buildings which can be characterized by electromagnetic pollution, due to their proximity...
This paper addresses how to optimize the radio coverage area of OFDMA femtocell networks in enterprise deployment. Considering some basic requirements of coverage, including coverage holes, coverage overlaps, area spectral efficiency (ASE) and load balancing, the coverage optimization problem is modeled as a Multiple Attribute Decision Making (MADM) problem. Then the MADM-based coverage optimization...
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