177 research outputs found
ASIP data-plane processor for multi-standard wireless protocol processing
No full textEvolving Multi-Protocol Multi-Band Software Defined Radio (SDR) devices aim at supporting multiple protocols seamlessly and efficiently. The design of such radios necessitates flexibility in physical layer processing, flexibility in routing packets through processing engines and flexibility in radio frequency reception/transmission. This dissertation addresses an efficient implementation of flexible physical layer processing (PHY) for Interleaving, De-Interleaving and linear Minimum Mean Square Error (MMSE) detection in Multiple Input Multiple Output (MIMO) receivers through Application Specific Instruction Set Processors (ASIPs). The thesis defines and develops a WINLAB cognitive radio (WiNC2R) compatible data-plane ASIP architecture along with suitable hardware-software partitioning of the Processing Engine unit. Given the requirement of very significant design time and the lack of the flexibility after design, dedicated ASIC for PHY may not be a viable option although it has the best performance among all available options. The software application running on general purpose processor cannot satisfy the throughput requirements of the wireless standards. ASIPs provide a better trade-off between flexibility and performance, with the advantage of considerably lower design time than ASICs. We design an efficient multi-standard (802.11a, 802.16e/m) supporting Interleaver/De-Interleaver ASIP, satisfying the throughput requirements for all the modulation-schemes/data-rates in both of the standards. It can be programmed to scale for supporting future wireless standards (that use Block Interleaving/De-Interleaving). We also study viability of a flexible MIMO MMSE detector ASIP supporting variable MR (Number of receiving antennas) * MT (Number of transmitting antennas) operations. We have analyzed the implementation of an hardware-centric algorithm for MIMO detection on an ASIP and also improved its performance with the help of techniques such as fixed point implementation, Single Instruction Multiple Data (SIMD) and Very Long Instruction Word (VLIW). Analysis of the design performance results for MIMO ASIP indicates the limitations of hardware-implementation-specific algorithms on ASIP. We also provide the account of design decisions such as custom ports, memory interfaces and registers that are added to the data-plane processor ASIPs in order to substitute them for dedicated hardware engines in the WiNC2R platform.M.S.Includes bibliographical referencesby Mohit Gopal Wan
Context-Driven Engineering Learning Model (CDELM): Companion Teaching Resource and Applied Decision Framework
No full textThis Open Science Framework (OSF) project documents the Context-Driven Engineering Learning Model (CDELM), a structured pedagogical framework integrating engineering education with applied decision-making, managerial reasoning, and real-world contextual triggers.
The project serves as a companion academic resource aligned with the Zenodo DOI publication and associated implementation materials. It includes conceptual structure, applied classroom scenarios, framework architecture, and decision-context mapping methodology designed for engineering and management education.
This repository supports transparent dissemination, academic reproducibility, and open scholarly visibility.
Associated DOI:
https://doi.org/10.5281/zenodo.18604436
Author:
Mohit Tiwari
Assistant Professor, Department of Computer Science & Engineering
Bharati Vidyapeeth's College of Engineering, Delhi, Indi
Author Correction: Closed-loop brain training: The science of neurofeedback
No full textIn this article, the affiliation for Mohit Rana was incorrectly listed as the Institute for Biological and Medical Engineering, Department of Psychiatry, and Section of Neuroscience, Pontificia Universidad Católica de Chile, Vicuña Mackenna 4860 Hernán Briones, piso 2, Macul 782–0436, Santiago, Chile. The listed affiliation should have been the following: Departamento de Psiquiatría, Escuela de Medicina, Centro Interdisciplinario de Neurociencias, Pontificia Universidad Católica de Chile, Santiago, Chile; and the Laboratory for Brain-Machine Interfaces and Neuromodulation, Pontificia Universidad Católica de Chile, Santiago, Chile. An acknowledgement to Mohit Rana’s funding source was also missing. The following sentence should have been included in the acknowledgments section: M.R. is supported by a Fondecyt postdoctoral fellowship (project no. 3100648
Piezoresponse force microscopy using adaptive contact-mode imaging
No full textAtomic Force Microscopy (AFM) is a type of Scanning Probe Microscopy (SPM) which involves a probe tip scanning over a sample surface for obtaining data of the sample. Data acquisition is carried out by making physical contact with the surface of the sample, thus there is scope of characterizing data even beyond basic topology. Piezoresponse Force Microscopy (PFM) is just an extension of AFM imaging which is used for obtaining the piezoelectric response of the sample using the converse piezoelectric effect. Piezoelectric effect can be observed in almost all the materials around us which include biological and inorganic materials. PFM imaging is extensively used in the nanoscale characterization of ferroelectrics and its applications continue to grow. Thus, with the growing use of this technique, it is important to obtain images of high quality and at a faster rate to reduce the time required to image without affecting its accuracy. Research and experiments show that with the help of different algorithms and external control, the speed of AFM imaging can be boosted with reduced loss of data and higher accuracy. This research aims at applying existing control methodologies used in AFM imaging to the PFM imaging and analyzing the output by comparing images obtained at lower and higher speeds using different methods.M.S.Includes bibliographical referencesby Mohit Waska
An Anatomization of Aadhaar Card Data Set – A Big Data Challenge
No full textAbstractBig data Analytics refers to the techniques that can be used for converting raw data into meaningful information which helps in business analysis and forms a decision support system for the executives in the organization. Big data is the voluminous and complex collection of data that cannot be processed using traditional tools. In this paper we author analyzed the aadhaar card data set against different research queries for example total number of aadhaar cards approved by state, rejected by state, total number of aadhaar card applicants by gender and total number of aadhaar card applicants by age type. The main objective of aadhaar card is to provide 12 digit unique numbers to each Indian resident. So that common masses can be benefited by the various governmental policies such as direct benefit transfer, aadhaar enabled biometric attendance and other uses by central government agencies
The Development of Mobility as a Service in China and Its Impact on Automobile Manufacturers
No full textMobility as a Service (MaaS) is not only the latest buzzword, but also a driver for the disruptive change in the automotive industry. The aim of this thesis is to suggest new business models for automobile manufacturers so as to capture the opportunities and overcome the threats brought by the development of MaaS. To begin with, the author first analyses the current situation of the Chinese MaaS market based on three different levels: country level, industry level, and customer level. Secondary research and customer survey are adopted to collect data for the analytical purpose. Thereafter, expert interviews are conducted in order to generate insights into the possible new business model options. Based on all the findings, three new business model options, which are B2B asset provider, Mobility service provider, and Autonomous mobility experience pioneer are proposed by using the 4I framework for the innovation process.Mobility as a Service (MaaS) is not only the latest buzzword, but also a driver for the disruptive change in the automotive industry. The aim of this thesis is to suggest new business models for automobile manufacturers so as to capture the opportunities and overcome the threats brought by the development of MaaS. To begin with, the author first analyses the current situation of the Chinese MaaS market based on three different levels: country level, industry level, and customer level. Secondary research and customer survey are adopted to collect data for the analytical purpose. Thereafter, expert interviews are conducted in order to generate insights into the possible new business model options. Based on all the findings, three new business model options, which are B2B asset provider, Mobility service provider, and Autonomous mobility experience pioneer are proposed by using the 4I framework for the innovation process
The Development of Mobility as a Service in China and Its Impact on Automobile Manufacturers
No full textMobility as a Service (MaaS) is not only the latest buzzword, but also a driver for the disruptive change in the automotive industry. The aim of this thesis is to suggest new business models for automobile manufacturers so as to capture the opportunities and overcome the threats brought by the development of MaaS. To begin with, the author first analyses the current situation of the Chinese MaaS market based on three different levels: country level, industry level, and customer level. Secondary research and customer survey are adopted to collect data for the analytical purpose. Thereafter, expert interviews are conducted in order to generate insights into the possible new business model options. Based on all the findings, three new business model options, which are B2B asset provider, Mobility service provider, and Autonomous mobility experience pioneer are proposed by using the 4I framework for the innovation process.Mobility as a Service (MaaS) is not only the latest buzzword, but also a driver for the disruptive change in the automotive industry. The aim of this thesis is to suggest new business models for automobile manufacturers so as to capture the opportunities and overcome the threats brought by the development of MaaS. To begin with, the author first analyses the current situation of the Chinese MaaS market based on three different levels: country level, industry level, and customer level. Secondary research and customer survey are adopted to collect data for the analytical purpose. Thereafter, expert interviews are conducted in order to generate insights into the possible new business model options. Based on all the findings, three new business model options, which are B2B asset provider, Mobility service provider, and Autonomous mobility experience pioneer are proposed by using the 4I framework for the innovation process
Behaviour of two-way spanning walls subjected to out-of-plane loading by numerical analysis
No full textUnreinforced masonry (URM) buildings are vulnerable when subjected to out-of-plane dynamic loading, especially under as earthquakes. Within the masonry building, the wall spanning in the direction perpendicular to the seismic loading is the most critical component. Damage to these walls (out-of-plane failure) frequently leads to the partial or global collapse in the URM building structures, especially if the wall is a load-bearing wall. Boundary conditions and overburden load drastically influence the response of out-of-plane loaded walls. Two-way spanning walls that are restrained on three or four sides show a larger force capacity compares to one-way spanning walls, which are only restrained at top and bottom. Nevertheless, the studies on the behavior of two-way spanning walls are limited. This thesis aims to understand the two-way bending behavior of unreinforced masonry walls subjected to out-of-plane loading employing numerical analysis. A three-dimensional model using a shell element is adopted. Cracking is modeled with a continuum damage approach by comparing the isotropic model, namely the rotating smeared cracking approach (TSRC), and an orthotropic model, namely the engineering masonry model (EMM). The effect of the top boundary condition on the response of the two-way spanning walls is examined by considering case studies: four sides restrained wall with overburden load, and three sides restrained wall without overburden load. Both the walls are vertically connected with the pier (or return wall) with an alternate row of headers providing full moment restraint. The description concerning the seismic behavior of the two-way spanning wall made based upon the analysis carried out incorporating different loadings types like the uniform, mode proportional loading, time history, and cyclic loading. The orthotropic material model is better in evaluating the response of the two-way spanning wall as compared to the isotropic material model if the proper support condition is specified. The difference in response using either material model is visible at the onset of cracking. The response of the two-way spanning wall under monotonic increasing load using EMM demonstrates walls have a displacement capacity to sustaining a relatively constant load, whereas the TSRC fails to capture this behavior. Due to high non-linearity because of cracking in the elements, the solution becomes non-convergent, and a solid statement regarding the ultimate displacement capacity of the wall can not be made. However, based on the results from static analysis using EMM, a two-way spanning wall have sufficient displacement capacity well over the wall thickness. The displacement capacity signifies the wall can deform in the out-of-plane direction without failure and is beneficial, especially during an earthquake event. In two-way spanning walls, both the peak load and initial stiffness of the walls is enhanced by higher pre-compression and top lateral support. It is found both experimentally and numerically, as precompression increases flexural and shear resistance capacity of the wall to resist the out-of-plane load. Furthermore, in the wall restrained on three sides, the crack pattern is initiated at the main-wall and pier connection, representing the head-joint cracking, leading to changing the behavior from two-way to one-way. While in the wall restrained on four sides, the cracking is initiated at the top and bottom support, therefore the wall can sustain the load both via horizontal bending along the vertical edge. Furthermore, the influence of top rotation fixity on the crack pattern in four sides restrained wall demonstrates the change in crack pattern without significant difference in the force-displacement plot. Therefore, it is vital to know the proper boundary condition in the wall to help in identifying the weakest link and suggest the necessary strengthening location. To predict the dynamic behavior of the two-way spanning wall by alternative load application is studies using static, non-linear time history, and cyclic analysis. The analysis of the wall with uniform monotonic increasing load fails to capture the post-crack behavior. Whereas, under the application of mode-proportional loading and using the material properties as stated in the case study, the initial stiffness and peak load is significantly lower, because of the applied load pattern. Therefore, the material properties are calibrated to match the initial stiffness and peak load but fail to provide information regarding peak load and ultimate displacement capacity. Using the original material properties, the outcome of the non-linear time history (NLTH) gives reasonable prediction in response up to the pre-crack run as compared to the case study. The four sides restrained wall shows very stiff response with very few cracks initiations to dissipate energy in the wall while rapid degradation in the three sides restrained wall is found, which attributed to the brittle response with wall top reaching the larger out-of-plane displacement. Due to non-linearity (follows from cracking), irrespective of the material model, the outcomes of NLTH analysis fails to capture the crack and post-crack behavior. Therefore, the material model needs improvement in tension and cohesion softening to better account for non-linearity in the time-history analysis. Due to the limitation of the NLTH analysis, cyclic analysis with increasing magnitude of load cycles was carried out to replicate the dynamic response. The outcomes give a fair indication of material degradation (based on energy dissipation) and crack formation but fail to capture the displacement capacity. Furthermore, the contribution of mode-II fracture energy in the overall energy degradation is significant for three sides restrained wall but not in four sides restrained wall. Due to top support, and increased shear strength capacity of the wall due to pre-compression load. Analyzing the two-way spanning wall under different loading shows the asymmetric response in the positive (toward pier) and negative (away from pier) displacement directions (with a 36% difference in force capacity). This asymmetry is arisen due to the presence of the return wall at the vertical junction. Finally, the combination of static (with uniform load) and cyclic analysis provides a reliable indication of wall force degradation of the two-way spanning wall. It can be used as a substitute for NLTH analysis. However, no solid statement regarding displacement capacity can be made based on the non-convergence in the numerical analysis. Furthermore, the crack pattern observes under different loading shows the damage is primarily influenced by boundary conditions rather than the type of loading. Based on the outcome of the thesis work, further studies are needed to improve the convergent behavior of the numerical analyses to gain information on the displacement capacity of two-way spanning walls subject to out-of-plane loading. Additionally, it becomes interesting to explore the use of micro-modeling to understand the crack propagation in the masonry wall, and to exploring different anisotropic model such as the Rankine-Hill model, or toexplore the implementation of strain rate dependent constitutive model (mainly used for impact loading) to understand the dynamic behavior in NLTH analysis
Integrity check of grounding grids at high voltage substations
No full textThe safety in the high voltage substations rely on the integrity of its grounding grid. A single discontinuity at any part of the grounding grid may cause a swell in touch or step potential that may expose the personnel to a hazard of critical electric shock. It may also lead to malfunction of the protection devices leading to erroneous tripping of circuit breakers. This report presents a cost-effective, reliable and precise way to investigate the integrity of grounding grid. An experimental setup was performed in the laboratory to inspect and corroborate the results; thereafter repeating and validating the experiment in a substation.Electrical Engineerin
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