Dual Frequency Circular Shaped Two Port MIMO Antenna
Design and Development of Portable Oxygen Concentrator
Design and Simulation of Antenna for Foliage Penetration Application
Performance Enhancement of Microstrip Patch Antenna with Slots for 5G Communication
Ergonomic Wheelchair - Stretcher for Enhanced Patient Mobility
The Impact of Substrate Doping Concentration on Electrical Characteristics of 45nm Nmos Device
A Study on Globally Asynchronous and locally Synchronous System
Method of 2.5 V RGMII Interface I/O Duty Cycle and Delay Skew Enhancement
Performance Analysis of Modified Source Junctionless Fully Depleted Silicon-on-Insulator MOSFET
Automatic Accident Detection and Tracking of Vehicles by Using MEMS
Efficient Image Compression Algorithms Using Evolved Wavelets
Computer Modeling and Simulation of Ultrasonic Signal Processing and Measurements
Effect of Nano-Coatings on Waste-to-Energy (WTE) plant : A Review
ANFIS Controlled Solar Pumping System
Dual Frequency Circular Shaped Two Port MIMO Antenna
For the generation of narrow beams and other desired beam shapes, the antenna arrays are widely used. Mostly in high resolution radars and for point to point communication, narrow beams are used. There will be one major lobe followed by a number of minor lobes for any pattern produced by array antenna. For the purpose of covering wide angular regions, flat or sector beams are used. For ground mapping and also for airport surveillance, cosecant beams are used. The width of main beam becomes very small and is mostly a useful point to point communication, when the selected antenna array is sufficiently large enough. Generally, stair-step patterns are employed to identify when there is more than one target moving with both different altitudes and angular regions. However, it is required to design the sufficiently large enough arrays to produce optimized patterns. In this paper, Fourier transform technique is extended to design an aperture distribution for the generation of stair-step patterns and also an amplitude control technique for the generation of sector beams to produce the ramp patterns.
VC is one of the fields of the speech processing voice transformation approaches for transforming the characteristics of voice produced by a person speaking, singing or audio samples, transforming voice into simple and flexible ways, so that a listener would be able to identify the speech uttered by the target speaker. Speech processing is widely used in the research for last two decades, with an increasing commercial interest and applications of VC such as Speech-to- Speech Translation (SST), and Text-To-Speech (TTS). More traditional methods are available for voice conversion, but they do not provide better converted speech; such as GMM doesn't generate high quality converted voice because GMM based VC creates over-smoothing. Hence in this research, the authors have proposed a new voice conversion algorithm, Minimum Distance Spectral Mapping (MDSM) based on the idea of Dynamic Time Warping (DTW), where point-to-point mapping is used in the warping function. Also amplitude scaling function is intended to adjust mean source log amplitude spectrum to the mean target log amplitude spectrum, in order to reduce over-smoothing. Since most of the spectral envelopes in amplitude scaling mean log spectral envelopes are smooth, there is no necessity in finding the smoothing factors. The proposed MDSMAS preserves spectral details, provides improved speech quality and identifies the similarity between source and target data and also provides improved result in objective tests.
This paper proposes a diode-free Operational Transresistance Amplifier (OTRA) based Time Marker Generator (TMG). It comprises of three stages. The first stage uses OTRA in open loop configuration, behaving as a comparator. A RC differentiator is used in the second stage to achieve voltage spikes. The third stage employs a MOS transistor to obtain the desired output. The proposed time marker generates spikes at positive or negative cross points depending upon the type of MOS transistor used. To illustrate the operation of the proposed TMG, SPICE simulations are performed using CMOS based OTRA implementation that uses 0.18 μm CMOS technology parameters. Simulations corroborate with the theoretical predictions.
Phase Frequency Detectors (PFD) are the most important components of Phase Locked Loops (PLLs) which gives an output that is linearly proportional to the phase difference of the reference signal (CKR) and output of VCO (CKF) [8]. PFD has a number of applications in communication systems, wireless sensors, and robotics. Some application are focused on the efficiency or bandwidth, some other on low noise and jitters or it can be its size. In this paper, effect of scaling on a latch based PFD is presented. This paper presents the compassion of various technologies using different channel lengths and is useful to determine which is the best suitable channel length having best characteristics. Various technologies of CMOS are used and the performance is considered on the basis of two parameters-power consumed and delay in output when input is already given. The authors have used Tanner EDA 14.11 version on various technologies.
The electrical activities of the brain can be recorded using EEG (Electroencephalogram). EEG is often used to diagnose coma, epilepsy, brain death, tumors, stroke, and other brain disorders. In spite of limited spatial resolution, EEG is one of the important and handy tools for research and diagnosis. The EEG records through surface electrodes that are placed onto the scalp of a patient. Unfortunately, EEG data is contaminated by artifacts due to movement of eye related muscles and eyeballs. Thus ocular artifacts make the analysis of neuronal data very complex. EEG signal amplitude is very low in the order of 20-50 μV. These artifacts lead to wrong analysis and interpretation of the disorder. The focus of this work is to develop a novel technique that can detect and remove eye blink artifacts in order to facilitate analysis of EEG recordings using Empirical Mode Decomposition (EMD), and Hilbert Huang Transform (HHT). A GUI (Graphic User Interface) model was designed and developed, so as to enable the users ease in handling data of various patients for medical diagnosis. This project is implemented with the help of GUIDE, a graphical user interface in MatLab. The algorithm developed is applied on the data taken from various patients. The results demonstrate that, HHT is one of the best approaches for analyzing and de-noising EEG Signals.
The polarization effects in photonic crystal fibers is observed by using nanoscale metals films and this effect is calculated by using Finite Element Method. The phenomenon of surface Plasmon resonance has also been observed and it has been observed that the metals which show surface plasmon resonance are generally very good conductors such as gold, silver, Aluminium, etc. In this review paper, various designs have been studied using various metal films, liquid crystals, and so on. It has been observed that resonance wavelengths can be modulated by adjusting the dimensions of air hole as well as the diameter of air hole which is coated by different metal films or metal wires. It has also been observed that the loss in y-mode is very high as compared to x-mode at their respective wavelengths. It is desired to have resonant wavelength in optical window, ie., in the range of 1.31 to 1.55 μm.