The Infona portal uses cookies, i.e. strings of text saved by a browser on the user's device. The portal can access those files and use them to remember the user's data, such as their chosen settings (screen view, interface language, etc.), or their login data. By using the Infona portal the user accepts automatic saving and using this information for portal operation purposes. More information on the subject can be found in the Privacy Policy and Terms of Service. By closing this window the user confirms that they have read the information on cookie usage, and they accept the privacy policy and the way cookies are used by the portal. You can change the cookie settings in your browser.
There has been increasing demand for precise positioning from Global Positioning System (GPS) satellites, particularly in fading environments that are challenging for the autonomous and semi-autonomous vehicle. GPS signals are right hand circularly polarized (RHCP) however, in dense multipath environments the polarization of a GPS signal may change to become left hand circularly polarized (LHCP)....
An identification algorithm for the simultaneous identification of the bearing and unbalance parameters for flexible rotor-bearing systems has been developed by using run-down measurements. Speed-dependent bearing dynamic coefficients for each bearing and residual unbalances at predefined balancing planes are estimated simultaneously by the algorithm. The proposed identification algorithm is demonstrated...
A multi-crack identification algorithm has been developed based on the forced response from a shaft. Transverse vibrations of a cracked shaft in the two orthogonal planes are analyzed. The presence of cracks in a shaft introduces a local slope discontinuity in the elastic line of the shaft. This slope discontinuity is estimated by approximating the forced response of shaft at consecutive measurement...
A wireless sensor network (WSN) employed to serve smart city applications is usually located in a vast and vulnerable territory. In order to secure vital and critical information, the security requirements of data confidentiality, authenticity and availability should be guaranteed. One of the leading key management schemes is based on using location information to generate security credentials. However,...
The Global positioning system (GPS) uses long pseudorandom code sequences at L-band frequencies to provide navigation services to civilian and military users. However, in case of weak signals a long exhaustive search is required at the receiver for signal acquisition. A new acquisition method named Repetitive Block Acquisition (RBA) has been proposed to improve the detection performance and to speed...
Power consumption during the test mode of circuit operation is a major concern for scan based low power circuits. While there are multiple DFT and ATPG techniques proposed in the literature for addressing both shift and capture power reduction, most of the solutions are coarse-grained in nature - in the sense that they attempt to reduce power while being agnostic of the local power density in the...
A 40 kV electron gun is designed and developed using the Pierce configuration for the focusing electrode. Simulations were carried out using CST Particle Studio. The Gun is a thermionic type electron gun with indirect heating of the LaB6 cathode. The gun is capable of delivering a beam current of more than 500 mA at 40 kV with a beam size of less than 5 mm. The cathode assembly consists of cups and...
This paper presents an analytical approach to calculate the spacing between the two parallel strings or rows of non-tracked solar Photovoltaics (PV) modules. Shadows of the front row modules fall on the modules of the next row. Optimum distance between the rows has been found for eight different cities of India through the calculations of sun path and length of shadow cast by modules. The shadow length...
In situ satellite observations have previously been employed to map the global morphology of electron density irregularity parameters which define scintillation. In particular the power exponent of the inverse spatial spectrum of the irregularities pi can be determined which will yield the slope p of the psd of the resultant scintillation from p=pi −1. This also means that the inverse spatial spectrum...
Ionospheric scintillation occurs for transionospheric radio waves propagating through random ionospheric irregularities, which affect the phase and/or amplitude observations made by the receiver. Generally, the scintillation induces excess carrier phase jitter in the phase lock loop (PLL) of the GPS receiver, and strong scintillation can cause a conventional PLL (ATAN [arctangent method], constant...
The GPS signal propagating through the ionosphere is affected by rapid and irregular fading which is known as ionospheric scintillation. The scattering or diffraction phenomena due to ionospheric irregularities are responsible for the occurrence of this scintillation on signals received on the ground. The percentage of occurrences of scintillation can be high at high latitudes. In this region, the...
Phase scintillation, e.g. as observed from GPS satellites by ground receivers, is generally measured as the standard deviation of the random fluctuations of the phase received over a fixed period of time which is ofteny taken to be 60s. The measured phase scintillation can be an important tool in understanding the ionospheric turbulence producing it, and consequently its effect on GPS positioning...
Breast cancer is the second leading cause of cancer deaths in women worldwide and occurs in nearly one out of eight women. In this paper we develop a hybrid intelligent system for diagnosis, prognosis and prediction for breast cancer using SANE (Symbiotic, Adaptive Neuro-evolution) and compare with ensemble ANN, modular neural network, fixed architecture evolutionary neural network (F-ENN) and Variable...
Dynamic phenomena such as oil spills, mud flow, diffusion or leakage of gases in the environment are characterized by non-deterministic variations in shape, size and direction of motion. Due to the absence of any well defined model for tracking their dynamics, the detection and tracking of such phenomena through Wireless Sensor Networks (WSNs) is very challenging. Most of the existing works consider...
In this paper an attempt is made to develop speaker identification system which is used to determine the identity of an unknown speaker among several speakers of known speech characteristics, from a sample of his or her voice. Every speaker has different individual characteristics embedded in his /her speech utterances. These characteristics can be extracted from utterances and different neural network...
Information management and extraction in the field of biomedical research has become a requirement with the rapid increase in the amount of data being published in this area. In this paper, a graphical model, Conditional Random Fields has been used to extract a particular gene-gene relationship called ??coexpression?? from the existing literature. First, a Conditional Random Fields based model has...
The problem of path planning deserves a special mention in the field of robotics as it enables the intelligent systems used in autonomous robots to move the robot from one position to the other. Out of the various methods used for solving the problem of robot path planning, two of the common approaches include multi-neuron heuristic search (MNHS) algorithm and evolutionary algorithms (EA). The MNHS...
The past few years have seen a lot of applications of Hybrid Soft Computing approaches that seem to have completely replaced the traditional uni-system approaches. The added abilities that come from the hybrid approaches motivate their use in every system. Bio-Medical Engineering is yet another field which has seen a major change in the past few years. We find various new approaches being applied...
In the present work an attempt is made to develop a decision support system (DSS) using the pathological attributes to predict the fetal delivery to be done normal or by surgical procedure. The pathological tests like blood sugar (BR), blood pressure (BP), resistivity index (RI) and systolic/diastolic (S/P) ratio will be recorded at the time of delivery. All attributes lie within a specific range...
Text mining tools and algorithms are being successfully used for information extraction especially on large corpus like biomedical publications. These tools not only aid in information extraction but also in forming new theories and relationships between various fields of biomedical research. Extraction of gene-gene or gene-disease relationship is one such application. In this paper, we introduce...
Set the date range to filter the displayed results. You can set a starting date, ending date or both. You can enter the dates manually or choose them from the calendar.