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- AIN BUFFER LAYER; GAN FILMS; PIEZOELECTRIC FIELDS; OPTICAL ANISOTROPY; PLANE GAN; SAPPHIRE; GROWTH; ALGAN; SUBSTRATE; DIODES (1)
- Change of media usage habits of students and instructors (1)
- Confidentiality (1)
- DOMAIN-WALL (1)
- Data integrity (1)
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- Data warehouse (1)
- E-Learning (1)
- E-learning survey (1)
- Educational survey (1)
- Fault diagnosis (1)
- International comparison. (1)
- Latent residuals (1)
- MOLECULAR-BEAM EPITAXY; P-TYPE GAN; DOPED GAN; PHOTOLUMINESCENCE BANDS; MAGNETIC-RESONANCE; UNDOPED GAN; LUMINESCENCE; LAYERS; DEFECTS; EMISSION (1)
- Media Usage Survey (1)
- Media usage habits (1)
- NIPALS (1)
- New class faults (1)
- Open source software; Users; Requirements; Online forums; Empirical analysis (1)
- Privacy (1)
- QUANTUM-DOT; PHOTOCAPACITANCE; ARRAY (1)
- ROOM-TEMPERATURE; SINGLE-CRYSTAL; TUNNEL-JUNCTIONS; MAGNETORESISTANCE; FILMS; NANOMAGNETS; FIELD (1)
- Satisfaction with technology (1)
- Security issues (1)
- Technology-Enhance Learning (1)
- Technology-based teaching (1)
- Technology-enhanced learning (1)
- Wind turbine (1)
- Wold cross-validation (1)
Articles 1 - 13 of 13
Full-Text Articles in Engineering
Media Usage Survey: Overall Comparison Of Faculty And Students, Gerd Gidion, Michael Grosch, Luiz Fernando Capretz, Ken Meadows Dr.
Media Usage Survey: Overall Comparison Of Faculty And Students, Gerd Gidion, Michael Grosch, Luiz Fernando Capretz, Ken Meadows Dr.
Electrical and Computer Engineering Publications
Recent developments in the use of technologies in education have provided unique opportunities for teaching and learning. This paper describes the results of a survey conducted at Western University (Canada) in 2013, regarding the use of media by students and instructors. The results of this study support the assumption that the media usage of students and instructors include a mixture of traditional and new media. The main traditional media continue to be important, and some new media have emerged as seemingly on equal footing or even more important than the traditional forms of media. Some new media that have recently …
Media Usage In Post-Secondary Education And Implications For Teaching And Learning, Gerd Gidion, Luiz Fernando Capretz, Ken Mead Dr., Michael Grosch Dr.
Media Usage In Post-Secondary Education And Implications For Teaching And Learning, Gerd Gidion, Luiz Fernando Capretz, Ken Mead Dr., Michael Grosch Dr.
Electrical and Computer Engineering Publications
The Web 2.0 has permeated academic life. The use of online information services in post-secondary education has led to dramatic changes in faculty teaching methods as well as in the learning and study behavior of students. At the same time, traditional information media, such as textbooks and printed handouts, still form the basic pillars of teaching and learning. This paper reports the results of a survey about media usage in teaching and learning conducted with Western University students and instructors, highlighting trends in the usage of new and traditional media in higher education by instructors and students. In addition, the …
Security Issues In Data Warehouse, Saiqa Aleem, Luiz Fernando Capretz, Faheem Ahmed Dr.
Security Issues In Data Warehouse, Saiqa Aleem, Luiz Fernando Capretz, Faheem Ahmed Dr.
Electrical and Computer Engineering Publications
Data Warehouse (DWH) provides storage for huge amounts of historical data from heterogeneous operational sources in the form of multidimensional views, thus supplying sensitive and useful information which help decision-makers to improve the organization’s business processes. A data warehouse environment must ensure that data collected and stored in one big repository are not vulnerable. A review of security approaches specifically for data warehouse environment and issues concerning each type of security approach have been provided in this paper.
Efficient Residuals Pre-Processing For Diagnosing Multi-Class Faults In A Doubly Fed Induction Generator, Under Missing Data Scenarios, Roozbeh Razavi-Far, Enrico Zio, Vasile Palade
Efficient Residuals Pre-Processing For Diagnosing Multi-Class Faults In A Doubly Fed Induction Generator, Under Missing Data Scenarios, Roozbeh Razavi-Far, Enrico Zio, Vasile Palade
Electrical and Computer Engineering Publications
This paper focuses on the development of a pre-processing module to generate the latent residuals for sensor fault diagnosis in a doubly fed induction generator of a wind turbine. The pre-processing module bridges a gap between the residual generation and decision modules. The inputs of the pre-processing module are batches of residuals generated by a combined set of observers that are robust to operating point changes. The outputs of the pre-processing module are the latent residuals which are progressively fed into the decision module, a dynamic weighting ensemble of fault classifiers that incrementally learns the residuals-faults relationships and dynamically classifies …
Addressing User Requirements In Open Source Software: The Role Of Online Forums, Arif Raza, Luiz Fernando Capretz
Addressing User Requirements In Open Source Software: The Role Of Online Forums, Arif Raza, Luiz Fernando Capretz
Electrical and Computer Engineering Publications
User satisfaction has always been important in the success of software, regardless of whether it is closed and proprietary or open source software (OSS). OSS users are geographically distributed and include technical as well as novice users. However, it is generally believed that if OSS was more usable, its popularity would increase tremendously. Hence, users and their requirements need to be addressed in the priorities of an OSS environment. Online public forums are a major medium of communication for the OSS community. The research model of this work studies the relationship between user requirements in open source software and online …
Are Students Satisfied With Media: A Canadian Case Study, Gerd Gidion, Luiz Fernando Capretz, Ken Meadow, Michael Grosch
Are Students Satisfied With Media: A Canadian Case Study, Gerd Gidion, Luiz Fernando Capretz, Ken Meadow, Michael Grosch
Electrical and Computer Engineering Publications
The article presents partial results of a survey about media usage habits for studying and learning conducted in 2013 at Western University, a large Canadian university. The article focuses on students’ frequency of use and satisfaction with media for studying and learning. The results of this study support the assumption that student’s media usage includes a mixture of traditional and new media. The main traditional media continue to play an important role in the students’ academic life, and some new media have emerged as seemingly on equal footing or even more important than the traditional forms of media. The use …
Energy-Efficient Magnetoelastic Non-Volatile Memory, Ayan K. Biswas, Supriyo Bandyopadhyay, Jayasimha Atulasimha
Energy-Efficient Magnetoelastic Non-Volatile Memory, Ayan K. Biswas, Supriyo Bandyopadhyay, Jayasimha Atulasimha
Electrical and Computer Engineering Publications
We propose an improved scheme for low-power writing of binary bits in non-volatile (multiferroic) magnetic memory with electrically generated mechanical stress. Compared to an earlier idea [N. Tiercelin et al., J. Appl. Phys. 109, 07D726 (2011)], our scheme improves distinguishability between the stored bits when the latter are read with magneto-tunneling junctions. More importantly, the write energy dissipation and write error rate are reduced significantly if the writing speed is kept the same. Such a scheme could be one of the most energy-efficient approaches to writing bits in magnetic non-volatile memory. (C) 2014 AIP Publishing LLC.
Critical Analysis And Remedy Of Switching Failures In Straintronic Logic Using Bennett Clocking In The Presence Of Thermal Fluctuations, Kuntal Roy
Electrical and Computer Engineering Publications
Straintronic logic is a promising platform for beyond Moore's law computing. Using Bennett clocking mechanism, information can propagate through an array of strain-mediated multiferroic nanomagnets, exploiting the dipolar coupling between the magnets without having to physically interconnect them. Here, we perform a critical analysis of switching failures, i.e., error in information propagation due to thermal fluctuations through a chain of such straintronic devices. We solved stochastic Landau-Lifshitz-Gilbert equation considering room-temperature thermal perturbations and show that magnetization switching may fail due to inherent magnetization dynamics accompanied by thermally broadened switching delay distribution. Avenues available to circumvent such issue are proposed. (C) …
Nanowire-Based Frequency-Selective Capacitive Photodetector For Resonant Detection Of Infrared Radiation At Room Temperature, Saumil Bandyopadhyay
Nanowire-Based Frequency-Selective Capacitive Photodetector For Resonant Detection Of Infrared Radiation At Room Temperature, Saumil Bandyopadhyay
Electrical and Computer Engineering Publications
Characteristics of a capacitive infrared photodetector that works at room temperature by registering a change in capacitance upon illumination are reported. If used in an ideal resonant inductor-resistor-capacitor circuit, it can exhibit zero dark current, zero standby power dissipation, infinite detectivity, and infinite light-to-dark contrast ratio. It is also made frequency-selective by employing semiconductor nanowires that selectively absorb photons of energies close to the nanowire's bandgap. Based on measured parameters, the normalized detectivity is estimated to be ∼3 × 107 Jones for 1.6 μm IR wavelength at room temperature.
Excitonic Recombination Dynamics In Non-Polar Gan/Algan Quantum Wells, D. Rosales, B. Gil, T. Bretagnon, B. Guizal, F. Zhang, S. Okur, M. Monavarian, N. Izyumskaya, V. Avrutin, Ü Özgür, H. Morkoç, J. H. Leach
Excitonic Recombination Dynamics In Non-Polar Gan/Algan Quantum Wells, D. Rosales, B. Gil, T. Bretagnon, B. Guizal, F. Zhang, S. Okur, M. Monavarian, N. Izyumskaya, V. Avrutin, Ü Özgür, H. Morkoç, J. H. Leach
Electrical and Computer Engineering Publications
The optical properties of GaN/Al0.15Ga0.85N multiple quantum wells are examined in 8 K–300 K temperature range. Both polarized CW and time resolved temperature-dependent photoluminescence experiment are performed so that we can deduce the relative contributions of the non-radiative and radiative recombination processes. From the calculation of the proportion of the excitonic population having wave vector in the light cone, we can deduce the variation of the radiative decay time with temperature. We find part of the excitonic population to be localized in concert with the report of Corfdir et al. (Jpn. J. Appl. Phys., Part 2 52, 08JC01 (2013)) in …
Properties Of The Main Mg-Related Acceptors In Gan From Optical And Structural Studies, B. Monemar, P. P. Paskov, G. Pozina, C. Hemmingsson, J. P. Bergman, S. Khromov, V. N. Izyumskaya, V. Avrutin, X. Li, H. Morkoç, H. Amano, M. Iwaya, I. Akasaki
Properties Of The Main Mg-Related Acceptors In Gan From Optical And Structural Studies, B. Monemar, P. P. Paskov, G. Pozina, C. Hemmingsson, J. P. Bergman, S. Khromov, V. N. Izyumskaya, V. Avrutin, X. Li, H. Morkoç, H. Amano, M. Iwaya, I. Akasaki
Electrical and Computer Engineering Publications
The luminescent properties of Mg-doped GaN have recently received particular attention, e.g., in the light of new theoretical calculations, where the deep 2.9 eV luminescence band was suggested to be the main optical signature of the substitutional Mg Ga acceptor, thus, having a rather large binding energy and a strong phonon coupling in optical transitions. We present new experimental data on homoepitaxial Mg-doped layers, which together with the previous collection of data give an improved experimental picture of the various luminescence features in Mg-doped GaN. In n-type GaN with moderate Mg doping (<1018 cm−3), the 3.466 eV …
Spectroscopy Studies Of Straincompensated Mid-Infrared Qcl Active Regions On Misoriented Substrates, Gregory Edward Triplett, Justin Grayer, Charles Meyer, Emily Cheng, Denzil Roberts
Spectroscopy Studies Of Straincompensated Mid-Infrared Qcl Active Regions On Misoriented Substrates, Gregory Edward Triplett, Justin Grayer, Charles Meyer, Emily Cheng, Denzil Roberts
Electrical and Computer Engineering Publications
In this work, we perform spectroscopic studies of AlGaAs/InGaAs quantum cascade laser structures that demonstrate frequency mixing using strain-compensated active regions. Using a three-quantum well design based on diagonal transitions, we incorporate strain in the active region using single and double well configurations on various surface planes (100) and (111). We observe the influence of piezoelectric properties in molecular beam epitaxy grown structures, where the addition of indium in the GaAs matrix increases the band bending in between injector regions and demonstrates a strong dependence on process conditions that include sample preparation, deposition rates, mole fraction, and enhanced surface diffusion …
Orientation-Dependent Pseudomorphic Growth Of Inas For Use In Lattice-Mismatched Mid-Infrared Photonic Structures, Gregory Edward Triplett, Charles Meyer, Emily Cheng
Orientation-Dependent Pseudomorphic Growth Of Inas For Use In Lattice-Mismatched Mid-Infrared Photonic Structures, Gregory Edward Triplett, Charles Meyer, Emily Cheng
Electrical and Computer Engineering Publications
In this study, InAs was deposited on GaAs (100) and GaAs (111)B 2 degrees towardssubstrates for the purpose of differentiating the InAs growth mode stemming from strain and then analyzed using in-situ reflection high energy electron diffraction, scanning electron microscopy, Raman spectroscopy, reflectance spectroscopy, and atomic force microscopy. The procession of InAs deposition throughout a range of deposition conditions results in assorted forms of strain relief revealing that, despite lattice mismatch for InAs on GaAs (approximately 7%), InAs does not necessarily result in typical quantum dot/wire formation on (111) surfaces, but instead proceeds two-dimensionally due primarily to the surface orientation.