Conference Papers
Permanent URI for this collectionhttps://idr.nitk.ac.in/handle/123456789/28506
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Item Fast response search and rescue robot, assisted low power WSN net for navigation and detection(IEEE Computer Society, 2013) Kumar, S.; Reddy, V.; Prakash, P.; Aparna., P.Our project is a remotely controlled robot capable of surveying disaster situations or act as a security countermeasure. It utilizes a stationary network of passive infrared sensor nodes interconnected through a multi-hop Zig bee network. The sensors are motion sensitive and using regional localization can be used for identifying the location of survivors or intruders based on the situation. The robot is controlled via a Wi-fi link which streams real time video back to the base station. The main processor is a TI Sitara AM335x ARM processor. It also acts as relay for the sensor data. Each node consists of three passive infrared detection circuits each covering a sector of 120 degrees and connects via the TI CC2530 ZNP chip. The raw PIR data is signal conditioned using an LM324 Op-amp. The nodes can be deployed easily due to their compact size. Their low power consumption and low cost makes them ideal for remote areas and can be deployed in large numbers. © 2013 IEEE.Item A Resolution Independent 2-Bits-per-Cycle SAR ADC(Institute of Electrical and Electronics Engineers Inc., 2014) Morakhia, A.; Gunnam, S.; Prakash, P.; Kudli, S.; Laxminidhi, T.This paper proposes a resolution independent architecture for SAR ADCs. The proposed architecture uses 2 bits per cycle conversion and is made independent of number of ADC bits. A 2-bit flash ADC is used to compute 2-bits in each iteration. The reference voltage across the resistor divider of the 2-bit flash ADC is changed in each iteration based on the 2-bits resolved in the previous iteration. The reference voltages for each iteration are generated using a pair of modified switched capacitor-based DACs. The new DAC architecture used in the proposed ADC can use the thermometric code output of the 2-bit flash ADC directly, avoiding the need for complex control circuitry. The dependency of DAC architecture on the ADC resolution, observed in conventional SAR ADCs, has been absorbed into the digital logic which is easy to design. The proposed architecture is validated using an 8 bit ADC designed in 0.25 μm CMOS process. © 2014 IEEE.Item Performance analysis of process driven and event driven web servers(Institute of Electrical and Electronics Engineers Inc., 2015) Prakash, P.; Mohan, R.; Kamath, M.Nowadays virtualization playing a vital role in the cloud technology. Users deploying websites on virtual private servers called instances which is cost effective and scalable. The explosive growth in World Wide Web, users are able to access things with any device at any time and any place. Increasing the access will constitutes the load and stress on the servers. Sometrics are useful to gauge the performance of various architectures. In this analysis we consider three matrices, they are responsiveness, scalability and efficiency. We have defined response time, memory usage and error rate as key factors for responsiveness, scalability and efficiency respectively. In this paper we investigate the performance of two web servers in different scenario, i.e. Apache-process-based webserver and Nginx-asymmetric multi-process event-driven architecture (AMPED). Our research shows that the Nginx server out performs Apache server in terms of responsiveness and scalability, while Apache ensures the efficiency. The results are useful for those who want to host a website on virtual private server (VPS). © 2015 IEEE.Item Parallel OpenMP and CUDA Implementations of the N-Body Problem(Springer Verlag service@springer.de, 2019) Gangavarapu, T.; Pal, H.; Prakash, P.; Hegde, S.; Geetha, V.The N-body problem, in the field of astrophysics, predicts the movements of the planets and their gravitational interactions. This paper aims at developing efficient and high-performance implementations of two versions of the N-body problem. Adaptive tree structures are widely used in N-body simulations. Building and storing the tree and the need for work-load balancing pose significant challenges in high-performance implementations. Our implementations use various cores in CPU and GPU via efficient work-load balancing with data and task parallelization. The contributions include OpenMP and Nvidia CUDA implementations to parallelize force computation and mass distribution, and achieve competitive performance in terms of speedup and running time which is empirically justified and graphed. This research not only aids as an alternative to complex simulations but also to other big data applications requiring work-load distribution and computationally expensive procedures. © 2019, Springer Nature Switzerland AG.Item Physical and mechanical properties of epoxy reinforced with pistachio shell particulates(American Institute of Physics Inc., 2021) Chandraker, S.; Agrawal, A.; Prakash, P.; Khan, I.A.; Sharma, A.Recently, natural fillers have gain huge interest among the academic researchers and scientists to be used as potential reinforcement material in polymeric matrix composites. The various reasons which attract the scientific community toward it usage in polymer composites are its low cost, ample availability, easy processing and the most important is the growing concern towards environmental awareness as they are bio-degradable. Reinforcing natural fillers is also an efficient approach towards waste management as most of the promising natural fillers were dumped if not used. Following the similar trend, an attempt has been made to utilize pistachio shells as a filler material in polymeric resin for developing a composite body. Pistachio shell with particle size 75 micron is used with epoxy matrix in present investigation. Six sets of epoxy based composites are fabricated using hand lay-up method by varying the filler content upto 30 wt. %. Density of the composites is evaluated using Archimedes principle. Micrographs are taken to visualize the compatibility between filler and matrix body. Tensile strength, compressive strength, flexural strength and hardness are the various mechanical properties evaluated of the developed materials. From the experimental analysis, it has been found that, all the mechanical properties of the composite under consideration increases with filler content. Though increase in density is also observed with filler loading but the increment is marginal. On the basis of experimental findings, it can be concluded that the developed material can be gainfully found its application in light duty structures. © 2021 Author(s).Item Predictive Model for Enhancing Water Quality Monitoring leveraging Satellite Data(Institute of Electrical and Electronics Engineers Inc., 2024) Prakash, P.; Sowmya Kamath, S.; Bhattacharjee, S.; Umesh, P.; Gangadharan, K.V.Remote sensing data can be used instead of conventional methods to collect image data from multiple satellites with acceptable spatial and temporal coverage. The proposed study makes use of Landsat 8 Operational Land Imager (OLI) data. The relationship between reflectance retrieved from Landsat 8 OLI data and in-situ data is established through the application of machine learning model. The dataset is made up of Landsat8 band extractions for water quality features. Water with high turbidity is predicted and verified using in-situ data that was gathered within the chosen temporal and spatial limits. © 2024 IEEE.