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Many significant sources of error take place in the smart antenna system like mismatching between the supposed steering vectors and the real vectors, insufficient calibration of array antenna, etc. These errors correspond to adding spatially white noise to each element of the array antenna, therefore the performance of the smart antenna falls and the desired output signal is destroyed. This paper...
In opportunistic mobile crowdsensing, data can be collected by leveraging human mobility and smartphones' sensors. In this paper, we propose Re-OPSEC, a framework for tasking effective providers from the crowd at real time in energy efficient way. Re-OPSEC piggybacks sensing tasks with volunteer-specific connectivity patterns called online episodes. That is those times when smartphones have a mobile...
Formal Concept Analysis (FCA) is a prominent field of applied mathematics using formal concepts — maximal clusters of object-attribute relationships — to discover, process, and represent knowledge in so-called conceptual hierarchies. Its efficient algorithms and expressive power makes FCA suitable to unify methodologies and to provide an in-depth insight on knowledge structures [1], [2]. Electronic...
An analytically extended function (AEFD) for modelling of lightning currents first derivatives is presented in this paper. Among other mathematical functions, Heidler's function is often used for approximating lightning currents of the first positive, first and subsequent negative strokes as given in the IEC 62305 Standard. Analytically extended function (AEF) may be used for these currents representation...
In this paper, the recognition of and the differentiation between fall activities and activities of daily living (ADL) was performed using the MobiFall dataset. A large database was constructed to train and validate the model. Feature selection methods were implemented to reduce dimensionality. Five different classification algorithms were implemented and evaluated based on their accuracy' sensitivity,...
Privilege separation has been proposed to reduce exploitation capabilities attackers may gain after successfully infiltrating a process, e.g. a network daemon. In this article we present a highly automated approach for decomposition of existing source code in order to realize such a privilege separation for existing monolithic software. For this, we describe an approach to analyze the source code,...
This paper deals with blind propagation channel estimation that should be a key feature for future agile waveforms. The proposed approach is based on high order statistics, inverse Fourier Transform and auto-deconvolution. The paper can be seen as a follow up to a previous work devoted to this subject [10]. It introduces an important improvement in the auto-deconvolution step based on a whitening...
Information systems of educational organizations often represent a potential well of useful information which can be discovered and interpreted by using specific methods. Exam results in particular are commonly used as a single-use measure of individual knowledge states, after which they are archived and subsequently never used again. Our approach suggests using past exam results as a rich data source...
The future smart grid is expected to be an interconnected network of small-scale and self-contained micro-grids (MGs), in which renewable energy sources (RESs) play significant role in generation level as well as attract special attention to the aim at a friendly environmental society. In this paper, optimal operation of distributed generations (DGs) are analyzed probabilistically due to uncertainties...
A Wireless Sensor Network is a special network that requires adaptive methods and techniques to meet the application requirements. Optimizing the energy consumption and enhancing the network lifetime while routing data from sensor nodes to the base station is the subject of extensive research works. This paper presents and evaluates an energy efficient cluster-based routing protocol that uses a fuzzy...
Smart antenna systems are of great importance in wireless communication and radar applications. They effectively enhance the system capacity and reduce the co-channel interference. Smart antenna is an array antenna that uses adaptive beamforming algorithms to steer the main beam toward the desired signal direction and reject the interfering signals of the same frequency from other directions without...
A major challenge in wireless sensor network (WSN) is data collection in a disconnected network while ensuring a viable throughput for the sensors or the nodes in the network. Incorporating mobility-assisted data collection where no other means of data gathering is feasible is a growing trend among researchers. There are many works in literature which exploit mobility to derive throughput using protocol...
The great interest in the business that can be generated by the IoT has led over the years to the development of a large number of communication technologies able to allow IoT smart objects to be wireless connected. Even though on the one hand such a multitude of technologies has enabled a wide range of applications, on the other hand, it has produced a growing heterogeneity in the IoT scenario. By...
Cognitive radio networks will play important role in future wireless networks. This paper proposes a new resource allocation strategy in cooperative multi-relay cognitive radio networks, in which multi second users can work as the relays of primary users to accelerate the data transmission when the channel between primary transmitter and primary receiver is weak. In the strategy, the data transmission...
In this paper, the k-μ-g random variable is considered. The k-μ-g random process arises from the κ-μ random process when the power of the k-μ random variable follows Gamma distribution. The closed form expressions for probability density function (PDF) and cumulative distribution function (CDF) of k-μ-g random variable are determined. Then, PDFs of the moment of n-th order of k-μ-g random variable,...
Accurate Spectrum Prediction is a promising solution to save sensing energy and time, it also helps to increase throughput in cognitive radio systems. In this paper, we investigate the use of wavelet neural networks (WNN) in predicting future channel occupancy status. The proposed work builds upon existing concepts in open literature, gathered in a general framework for applying WNN. An experimental...
We present a moderately simple to implement but very effective and silent deanonymization scheme for Tor traffic. This is done by bridging the mixes in Tor, that is, we control both the traffic leaving the Onion Proxy (OP) and the traffic entering the Exit node. Specifically, from a user's viewpoint, our proposal has been implemented in the popular Android platform as a spyware, having the dual aim...
The 5G cellular networks has brought along with it a plethora of the connected devices which turned the scales from human-centric to device-centric communication leading to more issues in the spectrum reuse. In this context, this article tackles the resource allocation issue within D2D communications underlay uplink in 5G networks. We focus our study on maximizing the overall system throughput and...
Adaptive HTTP video streaming has gained popularity in providing live feed from the events to mobile consumers. For reaching the widest possible audience, video service providers usually need to generate multiple video representations from the input stream suitable for different clients, which can increase the server-side energy consumption and processor load. HTTP streaming enables client adaptation...
In this contribution we present and discuss safety and health issues associated to Ground-Penetrating Radar (GPR) and, more in general, Near-Surface Geophysical (NSG) prospecting. In spite of the increasing demand of geophysical surveys all over the world, safety matters are rarely considered in this framework. We believe they are worth being considered and widely debated, in order to increase awareness...
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