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This paper investigates under which conditions information can be reliably shared and consensus can be solved in unknown and anonymous message-passing networks that suffer from crash-failures. We provide algorithms to emulate registers and solve consensus under different synchrony assumptions. For this, we introduce a novel pseudo leader-election approach which allows a leader-based consensus implementation...
A strongly fair schedule is one in which tasks that are enabled infinitely often are also executed infinitely often. When tasks execute atomically, a strongly fair scheduler can be implemented in a maximal manner. That is, an algorithm exists that, for any valid schedule, is capable of generating that schedule. We show that this assumption of atomicity is necessary. That is, when task execution can...
Local classifiers are often used in automotive pedestrian detection systems. The disadvantage of such systems is that they only regard local image cutouts to discriminate pedestrian class from its background. In those cases where false alarms bear a great resemblance to true positives it is difficult to solve the classification task in that way. As a possible solution this paper presents a general...
Pedestrian detection in a real scene is an interesting application for video surveillance systems. This paper presents our contribution to improve the work of Viola and Jones, originally designed to detect faces. This work uses a cascade of classifiers based on Adaboost using Haar features. It improves the learning step by including a decision tree presenting the different poses and possible occlusions...
Studies on the residue of atrazine in the soil have recently aroused great concern. This article studies the methods of determining the residue of atrazine in the soil, and thus helps solve the problems of pesticide residue. Use methanol aqueous solutions (9:1) to extract the atrazine in the soil. Concentrate the methanol, then chloroform extracted. After concentrating to a defined volume, use GC-14C...
A new method of two-way traffic signal timing control based on speed is presented. The whole control structure is divided into the decision-making level and control level. Two new measurements are put forward which weigh traffic urgency degree and differentiate traffic flow states separately based on traffic demands. Two-way traffic control and one-way traffic control can be transformed into each...
3-(4'-fluorophenyl)-5-(2'-sulfonylphenylazo)-rhodanine (4FRASP) firstly synthesized by the authors was used as chemiluminescence (CL) reagent. In acidic medium, CL was observed when amoxicillin was injected into the mixture of 4FRASP-potassium permanganate. Based on this phenomenon, a flow injection CL method was established for the determination of amoxicillin. The CL intensity was correlated linear...
A Wireless Sensor Network is engaged in a binary detection task and the operational modality is that known as running consensus: Each node continuously collects data and simultaneously exchanges informations with its neighbors, with the final aim of reaching agreement about a common detection statistic. This paper exploits an appropriate framework for investigating the detection performance of the...
Two efficient iterative sphere detectors based on the Schnorr-Euchner enumeration are the topic of this manuscript. The first one is capable of finding dasiagoodpsila candidate lattice points soon enough and its efficiency/performance are controlled by an adaptive radius update strategy. The second is a max-log detector. Because of the Schnorr-Euchner nature of the search, estimation of the initial...
This paper addresses the problem of spectrum sensing for cognitive radio, in the case of a primary signal characterized by a discontinuous channel occupation within the considered sensing window. Under such conditions, the performance of two different energy detectors is investigated. The first one (energy average detector) decides whether the channel is free or busy on the basis of the energy sample...
For multiple-input multiple-output (MIMO) systems, the optimum maximum likelihood (ML) detection requires tremendous complexity as the number of antennas or modulation level increases. This paper proposes a new algorithm which attains the ML performance with significantly reduced complexity. Based on the minimum mean square error (MMSE) criterion, the proposed scheme reduces the search space by excluding...
This work presents a new perspective to the relationship between the composite binary hypothesis test and the estimation of its unknown parameters, i.e. the Uniformly Most Powerful (UMP) test and the Minimum Variance and Unbiased Estimator(MVUE). We show that for the one-sided binary composite hypothesis test, if the UMP test exists, it is nothing but comparing the MVUE for the unknown parameter with...
The powerful tool of EXtrinsic Information Transfer (EXIT) charts is used to design a new serially concatenated Irregular Variable Length Coded (IrVLC) and unity-rate precoded Time-Hopping (TH) Pulse Position Modulation (PPM) aided Ultra-Wide Bandwidth (UWB) Spread-Spectrum (SS) impulse radio for near-capacity operation in Nakagami-m fading channels contaminated by Partial Band Noise Jamming (PBNJ)...
The bit error rate (BER) performance analysis of maximum-likelihood (ML) based decode and forward (DF) cooperative diversity systems has been a subject of considerable interest. Exact analysis of ML-DF transmission has been considered a challenging problem due to the nonlinear characteristic of the ML detector. In this paper, we provide exact expressions for the BER of ML-DF cooperative systems employing...
Detection of an unknown deterministic signal by using an energy detector is of promising for cognitive radio networks. In this paper, a new approach is proposed to analyze the performance of the energy detector. It is based on the contour integral representation of the Marcum-Q function and the use of the moment generating function (MGF) of the signal-to-noise ratio (SNR). A new decision variable...
Summary form only given. Magnetic spectrometry using polymer nuclear track detectors is used for high-resolution measurement of the energy spectrum of deuterons (> 250 keV) emitted from the pinch-column of the NX2 plasma focus (PF). The spectrum is measured for single PF shots. A 25 mum pinhole images the deuteron source on the spectrometer. This pinhole enables differential vacuum to be performed...
Mathematical formulas are derived for computing the relative performance gains obtainable with non-coherent and coherent integration in the detection of narrowband signals using an FFT filter bank. Numerical results are provided for typical implementation parameters. These results are useful for making appropriate tradeoffs in the design of solutions for practical signal detection problems.
Finding synchronization defects is difficult due to non-deterministic orderings of parallel threads. Current tools for detecting synchronization defects tend to miss many data races or produce an overwhelming number of false alarms. In this paper, we describe Helgrind+, a dynamic race detection tool that incorporates correct handling of condition variables and a combination of the lockset algorithm...
A key technology in cognitive radio (CR) is spectrum sensing that senses the spectrum and reports the available vacant channels. However, due to some effects such as fading or shadowing, an individual sensor may not be able to reliably detect the existence of a primary user (PU). Cooperative spectrum sensing that is proposed to solve such problem, uses a distributed detection system to overcome the...
In this study, a general approach to the detection problem of unknown-amplitude coherent signals in some practical groups of non-Gaussian and/or correlated clutters is investigated. Since there exist no closed-form analytical probability distributions in these contributions, an optimal likelihood ratio test is not applicable and we instead utilize the characteristic function and its estimate in order...
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