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Search Results: 1 - 10 of 22564 matches for " Rajesh Kumar Vishwakarma "
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Aperture Coupled Microstrip Antenna for Dual-Band  [PDF]
Rajesh Kumar Vishwakarma, Sanjay Tiwari
Wireless Engineering and Technology (WET) , 2011, DOI: 10.4236/wet.2011.22013
Abstract: This paper presents air gap aperture coupled microstrip antenna for dual-band operation over the frequency range of (2.9 to 6.0 GHz). This antenna differs from any other microstrip antenna with their feeding structure of the radiating patch element. Input signal couples to the radiating patch trough the aperture that exists on the ground plane of microstrip feed line. The dual-band achieved by variation of air gap [2 mm to 6 mm] between single patch antenna and aper-ture coupled microstrip antenna. The main advantage of this type antenna is increased the bandwidth of the antenna as compared to a single layered patch antenna. The two resonant frequencies can vary over a wide frequency range and the input impedance is easily matched for both frequencies. The obtain ratios of resonance frequencies are variable from 2.1 GHz to 1.1 GHz with increasing the air gap between single patch and aperture coupled microstrip antenna. The measured return loss [–14 dB] exhibits an impedance bandwidth of 35%. The input impedance and VSWR return loss have been measured with the help of Network analyzer.
Aperture coupled stacked patch antenna for dual band
Rajesh Kumar Vishwakarma,Sanjay Tiwari
International Journal of Electronics and Computer Science Engineering , 2012,
Abstract: -Microstrip antennas (MAS) are very useful antenna where low profile antennas are required. They are most popular due to their small size, low cost, light weight. The first aperture coupled microstrip antenna was introduced in 1985 by D M Pozar. Aperture coupled antenna is a particular antenna with high gain and wide bandwidth. This paper presents aperture coupled stacked patch antenna using air gap variation. The variation of air gap [2mm to 6mm] has been done between single patch antenna and an aperture coupled antenna. The main advantage of this antenna to increase the band width of the antenna as compared with single layered patch antenna. The resonant frequencies changes with air gap variations. The feed can be done either a conventional coaxial probe or through a coupling aperture in the ground plane as we done. This antenna works well in the frequency range (2.9 GHz to 6.0 GHz). The measured return loss exhibit an impedance bandwidth of 35%.The input impedance and VSWR return loss have been measured with the help of Network analyzer. [Agilent E8363B A.04.06] From the measured result it is found that the value of VSWR corresponding lower resonance frequencies increases from 14 to 2.2 with increasing air gap variation where as at the upper resonance frequencies is also increased from 1.8 to 2.3.
Role of Videonystagmography (VNG) in Epley’s Maneuver  [PDF]
Saloni Shah, Rajesh Vishwakarma
International Journal of Otolaryngology and Head & Neck Surgery (IJOHNS) , 2014, DOI: 10.4236/ijohns.2014.36056
Abstract: Aims and Objectives: To study benefit of videonystagmography in confirmation of canalolith repositioning in patients with Benign Paroxysmal Positional Vertigo after Epley’s manouver. Study Design: Prospective study of 35 cases of BPPV. Materials and Method: 35 patients of BPPV presenting at vertigo clinic of ENT department at Civil Hospital Ahmedabad were treated with canalolith repositioning procedure and improvement in nystagmus was studied and confirmed by VNG. Observation: 31 patients out of 35 patients were improved with 1st CRP, 2 out of 3 patients improved with 2nd CRP and 1 patient improved with 3rd CRP. This improvement is confirmed using VNG. Conclusion: Videonystagmography is a very useful tool for ensuring the otolith repositioning by the canalith repositioning manouver. It is a confirmatory adjunct to visual analysis.
Optimizing And Analysing The Effectiveness Of Security Hardening Measures Using Various Optimization Techniques As Well As Network Management Models Giving Special Emphasis To Attack Tree Model
Prabhat Kumar Vishwakarma
International Journal of Network Security & Its Applications , 2011,
Abstract: To cope up the network security measures with the financial restrictions in the corporate world is still a challenge. At global scenario the tradeoff between the protection of IT infrastructure and the financial boundation for any organization using IT as valuable resource is quite essential. Every organization has different security needs and different budgets for coping with that therefore whether it has to look as single objective or as multiple objectives with fault tolerant feature is a critical issue. In the present paper an attempt has been taken to optimize and analyze the effectiveness of security hardening measures considering attack tree model as base. In short we can say that the main attention in the paper is-to rectify, to describe the notations of the attack tree model and to suggest a model which may be able to quantitatively specify the possible threats as well as cost of the security control while implementing the security hardening measures.
A Sustainable Energy Efficiency Solution in Power Plant by Implementation of Perform Achieve and Trade (PAT) Mechanism  [PDF]
Rajesh Kumar, Arun Agarwala
Open Journal of Energy Efficiency (OJEE) , 2013, DOI: 10.4236/ojee.2013.24020

An enhanced energy efficiency scheme, “Perform, Achieve and Trade” (PAT) is explored in relation to the existing carbon market in India, particularly the Clean Development Mechanism, Renewable Energy Certification and possible Nationally Appropriate Mitigation Actions. The PAT scheme incentivises energy-intensive large industries and facilities for Enhance Energy Efficiency, through technology upgrade and improvement in process. The PAT scheme currently identified 478 designated consumers from eight energy intensive industrial sectors namely, thermal power plants, iron and steel, cement, textiles, chlor-alkali, aluminum, fertilisers and pulp & paper. The threshold limit in thermal power plant sector to become a PAT designated consumer is 30,000 tonne of oil equivalent annual energy consumption. In the first PAT cycle, run through 2012 to 2015, total 144 designated consumers from various states have been identified with individual target. Thermal power plant sector has been categorized on the basis of their fuel input into three subsectors i.e. gas, oil and coal based plants. This paper reviews the state of the art in PAT mechanism design and operational features for implementation on thermal power plant sector. The possibility of implementing an Emission Trading Scheme (ETS) in India is explored from political and institutional perspectives.

Color Image Enhancement Techniques: A Critical Review
Anish Kumar Vishwakarma,Agya Mishra
Indian Journal of Computer Science and Engineering , 2012,
Abstract: Image enhancement is one of the key issues in high quality pictures such as digital camera and HDTV. Since Image clarity is very easily affected by lighting, weather, or equipment that has been used to capture the image. These conditions lead to image may suffer from loss of information. As a result, many techniques have developed known as image Enhancement techniques to recover the information in an image. This paper presents a literature review on some of the image Enhancement techniques for color image enhancement like, Contrast Stretching, Histogram Equalization and its improvement versions, Homomorphic Filtering, Retinex, and Wavelet Multiscale Transform. Comparison of all the techniques concludes the better approach for its future research.
A review of Support Vector Clustering with different Kernel function for Reduction of noise and outlier for Large Database
Deepak Kumar Vishwakarma, Anurag Jain
International Journal of Advanced Computer Research , 2012,
Abstract: For a long decade clustering faced a problem of noise and outliers. Support Vector Clustering is one of the techniques in pattern recognition. Support Vector Clustering is Kernel-Based Clustering. Division of patterns, data items, and feature vectors into groups (clusters) is a complicated task since clustering does not assume any prior knowledge, which are the clusters to be searched for. Noise and outlier reduces the mapping probability of sphere in support vector clustering. Support vector clustering is inspired clustering technique form the support vector Machine. The prediction and accuracy of support vector clustering depends upon kernel function of hyper plane. Kernel function is a heart of classifier. In this paper we present review of support vector clustering technique for pattern detection and reorganisation for very large databases. The variation of performance of support vector clustering depends upon kernel of classifier. Here we discuss different method of kernel used in support vector clustering.
Efficient Voltage Regulation in Three Phase A.C. Transmission Lines Using Static VAR Compensator
International Journal of Advanced Research in Electrical, Electronics and Instrumentation Engineering , 2013,
Abstract: Due to the rapid technological progress, the consumption of electric energy increases continuously. But the transmission systems are not extended to the same extent because building of new lines is difficult for environmental as well as political reasons. Hence, the systems are driven closer to their limits resulting in congestions and critical situations endangering the system security. Power Flow Control devices such as Flexible AC Transmission Systems (FACTS) provide the opportunity to in uence power ows and voltages and therefore to enhance system security, e.g. by resolving congestions and improving the voltage pro le. From the last few years static var compensator plays an important role in voltage regulation in AC Transmission Systems. This paper deals with the designing and implementation of Static Var compensator for Efficient Voltage regulation in three phase A.C. transmission lines in MATLAB Simulink platform.
An efficient Support Vector Clustering with combined core outlier and boundary value for pre-processing of data
Deepak Kumar Vishwakarma, Anurag Jain
International Journal of Advanced Computer Research , 2012,
Abstract: The performance of support vector clustering suffered Due to noisy data. The pre-processing of data play important role in support vector cluster. In support vector clustering the mapping of data from one sphere to another sphere found some unwanted behaviour of data, these behaviour are boundary point, core and outlier. These data point degrade the performance and efficiency of support vector clustering. For the reduction of core, outlier and boundary value, we combined all dissimilar data and form COB model and data passes through genetic algorithm for collective collection of COB and reduce the COB value in data pre-processing phase. After reduction of COB support vector clustering are applied. Our empirical evaluation shows that our method is better than incremental support vector clustering and SSN-SVC.
Common Fixed Point Result of Multivalued and Singlevalued Mappings in Partially Ordered Metric Space  [PDF]
Rajesh Kumar Saini, Archana Sharma
Advances in Pure Mathematics (APM) , 2013, DOI: 10.4236/apm.2013.31019

In recent times the fixed point results in partially ordered metric spaces has greatly developed. In this paper we prove common fixed point results for multivalued and singlevalued mappings in partially ordered metric space. Our theorems generalized the theorem in [1] and extends the many more recent results in such spaces.

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