Vignan University

About: Vignan University is a education organization based out in Guntur, Andhra Pradesh, India. It is known for research contribution in the topics: Computer science & Control theory. The organization has 1138 authors who have published 1381 publications receiving 7798 citations.

Tangential and Exponential Kernel Weighted Regression Model for Multi-View Face Video Super Resolution

Abstract: The necessity of recognizing a person from the low resolution non-frontal image is a challenging problem in video surveillance. For alleviating the problem of recognition in images with low resolution, literature presents different techniques for face recognition after converting the images of low resolution into images of high resolution. Accordingly, this paper presents a technique for multi-view face video super resolution using the tangential and exponential kernel weighted regression model. In this paper, a novel hybrid kernel is presented to perform non-parametric kernel regression model for estimating neighbor pixels in the super-resolution after the face detection is performed using Viola-Jones algorithm. The experimentation is performed with the UCSD face video databases, and the quantitative results are analyzed using the SDME with the existing techniques. From the resulting outcome, we prove that the maximum SDME of 77.3 dB is obtained by the proposed technique while comparing with the nearest interpolation, bicubic interpolation, and bilinear interpolation techniques.

Stabilization and Aging Studies of Babul Wood Vacuum Pyrolysis Oil as a Potential Biomass Energy Source

Abstract: In the present study, Babul wood biomass was considered as case study which is a highly reactive feedstock for pyrolysis and abundant in India. Vacuum pyrolysis of babul wood produce a bio-oil result in pH of 2.3, moisture content of 26.3 wt% due to which viscosity at room temperature was 73.6 cP. Chemical characterization reveals that the composition of bio-oil contains carboxylic acid (~5 wt%), carbonyl group (~2 wt%), furfurals (~2 wt%), phenols (~3 wt%) in major quantity. Aging studies of crude bio-oil had observed that moisture content and viscosity increase with time simultaneously phase separation occurred during the storage at room temperature. Stabilization of bio-oil was carried out to remove to improve the shelf life of bio-oil. After stabilization bio-oil was found to be stable in all properties throughout the study of 60 days at room temperature conditions.

Inter-user Interference Mitigation Scheme for IEEE 802.15.4

Abstract: Wireless sensor networks have a wide range of applications However, these networks suffer interference from each other when many nodes belonging to different WSNs are deployed closely at the given geographical location To mitigate this problem, a mechanism of prioritized access is proposed in this work The proposed mechanism is carried out in two phases In the first phase, requests received from the devices are analyzed The analysis obtained in the first phase is applied to a dynamic slot assignment in the second phase Simulation results show a considerable improvement in throughput performance, for high priority data The effect of varying the active period in IEEE 802154 superframe is also analyzed to know its impact on throughput

Evaluation of Mean Wind Force Coefficients for High-Rise Building Models with Rectangular Cross-Sections and Aspect Ratio’s of 6 and 8

Abstract: Studies on measurement of wind loads on rigid models (geometric scale of 1:300) of tall rectangular high-rise buildings having plan dimensions of 7.5 cm (b) × 15 cm (d) with two different heights (h) of 45 cm and 60 cm, under simulated open terrain condition was carried out using Boundary Layer Wind Tunnel (BLWT) facility at CSIR-SERC, Chennai. The measurements of mean base forces (\( {\bar{\text{F}}}_{\text{x}} \), \( {\bar{\text{F}}}_{\text{y}} \) and \( {\bar{\text{F}}}_{\text{z}} \)) and torsions (\( {\bar{\text{T}}}_{\text{x}} \), \( {\bar{\text{T}}}_{\text{y}} \) and \( {\bar{\text{T}}}_{\text{z}} \)) were made using a six-component force/torque sensor for 8 different angles of wind incidence (θ), ranging from 0° to 90° and for 4 various mean wind velocities (\( {\bar{\text{U}}}_{\text{ref}} \)). Based on the analysis, mean base forces/torsions in three mutually perpendicular axes, mean force coefficients in body fixed axes X and Y, mean drag, lift force and torsion coefficients were obtained corresponding to reference mean pressures measured at top of the building. It is observed that the magnitudes of measured forces/torsions for model with h/b = 8 are found to be high when compared with forces for model with h/b = 6. The evaluated values of mean force coefficients obtained from the present study were compared with the values reported in IS: 875 and found that the values given in code are found to be conservative. Further, the % difference between them is observed to be within 5 %, especially for wind direction normal to longer width of models with h/b = 6 and 8, respectively.