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Wireless positioning has now gained considerable attention due to its wide applications in military, environmental, health and commercial systems. One of the main problems facing accurate positioning in actual wireless positioning system is non-line-of-sight (NLOS) propagation where the signal arrives at a base station from reflections. Although maximum likelihood estimator (MLE) and minimum mean...
This paper presents a method of vector network analyzer calibration using ‘Thru-Short-Delay’ for one-port measurements, which is expected to give a comparable accuracy to the TRL technique as it does not accompany cable movements. It uses a one-port VNA (Vector Network Analyzer) to avoid cable movements with ‘OSL’ (Open-Short-Load) calibration standards, which are widely used for one-port measurements,...
This article presents a new method of accuracy verification of calibrated vector network analyzers based on the modified calibration comparison technique. The method is of particular interest for low frequency ranges as well as for cost-effective S-parameter measurement systems where the use of conventional ripple test and precision reference air line standards may be impractical and/or relatively...
CT-guided interventions have been widely used in lung biopsy procedures to minimize invasion and to improve biopsy accuracy. The basic mathematical statement of the point-based registration problem remains the same in most applications, whereas there are variations on the size and shape of the fiducial markers. In this paper, we measured registration error FLEp and TRE respectively using two types...
Novelty detection is a useful ability for learning systems, especially in data stream scenarios, where new concepts can appear, known concepts can disappear and concepts can evolve over time. There are several studies in the literature investigating the use of machine learning classification techniques for novelty detection in data streams. However, there is no consensus regarding how to evaluate...
Software Cost Estimation (SCE) is a process related to the well-balanced management of a software project. Despite the evolving research activity, the task of estimating accurately the budget and the delivering time has been a research problem for many decades. Nowadays, the cost of a project is still estimated with error. The study of the error produced by estimation models or techniques has been...
With the scaling of CMOS technology, critical paths in digital circuits have become largely sensitive to process, voltage and temperature variations as well as to aging effects, generally resulting into a mismatch between the simulated path delay of the circuit obtained with CAD tools and the actual path delay on the manufactured chip. In order to solve this issue and to also avoid conservative strategies...
With the scaling of CMOS technology, critical paths in digital circuits have become largely sensitive to process, voltage and temperature variations as well as to aging effects, generally resulting into a mismatch between the simulated path delay of the circuit obtained with CAD tools and the actual path delay on the manufactured chip. In order to solve this issue and to also avoid conservative strategies...
In this paper, the influence of rotor position sensor accuracy on the performance of an Interior Permanent Magnet (IPM) motor drive for automotive propulsion is presented. Analytical equations describing the torque production in IPM machines show the need for rotor position feedback with high accuracy and resolution, especially for operation in the flux weakening region. Finite element analysis was...
In this paper the measuring and calibration techniques useful for ensuring the traceability of non-conventional instrument transformer, used in ac power plant up to 52 kV, are described and discussed. The aim of this work is to compare different calibration set up by evaluating the available uncertainty level.
In this work the Network Localization Problem with noisy measurements and mobility is considered. In particular, we first focus on the discovery of the localizable subnetwork by introducing an iterative approach to detect and merge small localizable components. Furthermore, we propose a novel check to mitigate the risk of flips ambiguities in order to enlarge the aforementioned subnetwork. Successively,...
A new coordinate system establishing method specific to all around space orientation are proposed in this paper. The error corresponding to the peak value of the error probability density of proposed arithmetic is much smaller than the traditional arithmetic even non line-of-sight measurement is not taken into account.
One of the principles of Smart Grids is to have a communication network that will integrate equipment allowing the monitoring and operation to be performed in real time in order to improve the quality indicators. However, this migration to an automated and monitored environment will demand many resources that will be used to perform the migration gradually. Therefore, this work proposes a methodology...
Localization is one of the fundamental problems in wireless sensor networks (WSNs), since locations of the sensor nodes are critical to both network operations and to most of the application level tasks. There exists an extensive body of paper that aims at obtaining locations as well as spatial relations of nodes in WSNs without requiring specialized hardware and/or employing only a limited number...
In this paper, based on the analysis of the principle of double cross positioning, the selected target placed on the positioning baseline's perpendicular bisector so as to cross-positioning and the positioning model under different geometric distribution conditions is established which is on the positioning baseline's perpendicular bisector, the target distance, lateral angle which are the key factors...
Double-frequency phase difference method is a simple and effective means for measuring the group delay of Frequency-Translating Devices (FTD). Especially for measuring the group delay of FTD which cannot accept the other local oscillator, the method shows the irreplaceable advantage. In order to obtain an accurate description of the group delay characteristics in the pass band of FTD, two improved...
The voltage coefficient of low voltage capacitor is the most important fact that affects the accuracy degree of capacitance value of capacitor. Its value and feature must be measured out when it used in the high accuracy situation. This paper presents an absolute double voltage measure method that gets the absolute voltage coefficient curve from 0 V to 1000 V needs only 5-step measurement. And proposed...
The objective of this paper is to discuss the accuracy and uncertainty of the standard WAsP model in determining the wind speed on a Croatian bora dominated site by using multiple wind measurements. The re sults show that on Croatian locati ons, however simple they might seem, it is essential to establish multiple wind measurements. Even with high quality measurements set at hub-heights and at a reasonable...
The automobile body surface quality is good or bad depends on the result of stamping parts drawing and drawing die is pulled out qualified panel key. According to the investigation and statistical analysis, cracking accounted for 30.24% in total defects, wrinkling accounted for 14.77%. Hybrid grid method was used to the plastic deformation area main strain distribution measurement. According to these...
Self-localization using unsynchronized low-complexity anchors has a number of attractive features. Traditional self-localization techniques are not suitable to this scenario or have their applicability limitations. In this paper, a two-step hybrid self-localization technique using unsynchronized low-complexity anchors is proposed, which can achieve two-dimensional (2-D) instantaneous localization...
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