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The successful delivery of medical care is a complex outcome that depends on multiple factors. Structural factors include the setting in which care takes place and related infrastructure that facilitate the care processes. The actual processes of medical care are defined by the completeness of the diagnosis and appropriateness and continuity of the resulting patient treatment. These factors are also...
This paper presents the design of a uniplanar 3-dB hybrid coupler for microwave integrated circuits (MIC) and monolithic MIC (MMIC) applications. The same was developed and tested experimentally using a network analyzer in Sumeru Microwave Communication Lab. Its design and application issues have been widely discussed here with some standard data and graphs. The experimental results for the standard...
Recent advancements in sonographic techniques have led to non-invasive visualization of organs. These advancements demand use of image processing for measurements on the images obtained from different scans. However, accurate measurement of blood flow is usually very difficult inspite of its important role in clinical diagnosis. Hence for better diagnosis by doctors, systems offering fast and accurate...
A new multi-phase PWM DC-DC converter with an auxiliary circuit to reduced switching losses across the switches, is designed, in order to solve the problem of meeting the power supply requirements of the new generation microprocessor, which requires 40-100 A current, lower voltage and better current transient response. The multi-phase topology benefits in components size reduction resulting in power...
Overloading is a technique to accommodate more number of users than the spreading factor N. This is a bandwidth efficient scheme to increase the number users or data rate in a fixed bandwidth. These schemes can be used to avoid the orthogonal code shortage problem to provide broadband wireless access in cellular communication. One of the efficient schemes to overload a CDMA system is to use two sets...
The Array multipliers are generally preferred for smaller operand sizes due to their simpler VLSI implementations, in-spite of their linear time complexity. The tree multipliers have time complexity of O (log n) but are unsuitable for VLSI implementation since they require larger total routing length, which may degrade performance. The properties of simpler VLSI implementation can be combined with...
This paper focused on the transient behavior of the shunt active power filter during harmonics and reactive power compensation. The transient response of the shunt active power filter (SAPF) is very important while compensating rapidly varying unbalanced and nonlinear loads. The dc-link capacitor voltage of SAPF is the function of load currents. Changes in load currents significantly affect the dc-link...
This paper focuses on the method of fault position for stochastic prediction of balanced and unbalanced voltage sags in a distribution system. The theoretical background about the short circuit analysis is presented and residual phase voltage equations for balanced and unbalanced fault are derived. Thereafter area of vulnerability based on the assessment of voltage sags have been presented for an...
The following topics are dealt with: mobile and wireless communications; optical and photonic communications; antennas and wave propagation; microwave theory and techniques; computational electromagnetics; performance of computer networks; networking technologies, services and protocols; information system security and assurance; software engineering; education technology; intelligent systems; biomedical...
Systems engineering is at a crossroad now at the beginning of the 21st century. One of the main challenges of any paradigms in systems engineering is being able to handle complex systems under unforeseen uncertainties. A system may be called complex if its dimension (order) is too high and its model (if available) is nonlinear, interconnected, and information on the system is uncertain such that classical...
This paper proposes a data hiding method that integrates access control and authentication of digital image in a single platform. First of all a content dependent binary watermark is generated based on discrete cosine transform (DCT) coefficients of a set of blocks (8 times 8), that are selected pseudo randomly on the basis of the key supplied. The binary watermark is then embedded into the DCT coefficients...
Feature extraction in noisy condition is one of the most important issues in the speech recognition system. There are two dominant approaches of acoustic measurement. First is in temporal domain called parametric approach like linear prediction (LP) and second is in frequency domain called nonparametric approach like Mel frequency cepstral coefficients (MFCC) based on human auditory perception system...
The current trend of hardware intensive signal processing is based on the CORDIC. Over the years many architectures have been proposed to address issues pertaining to throughput and latency. In this paper, we are proposing a pipelined architecture for the VLSI implementation of radix-4 CORDIC rotator with redundant arithmetic to achieve low latency compared to the available architectures.
Advances in wavelet transforms and quantization methods have produced algorithms capable of surpassing the existing image compression standards like the joint photographic experts group (JPEG) algorithm. The existing compression methods for JPEG standards are using DCT with arithmetic coding and DWT with Huffman coding. The DCT uses a single kernel where as wavelet offers more number of filters depends...
In this paper, a H-bridge VSC (voltage source converter) with a star/hexagon transformer as three phase four-wire DSTATCOM (distribution static compensator) is proposed for power quality improvement in three-phase four-wire distribution systems. The proposed DSTATCOM is employed for the compensation of reactive power for the voltage regulation or power factor correction along with elimination of harmonic...
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