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Articles 1 - 16 of 16
Full-Text Articles in Engineering
A Novel Real-Time Mac Layer Protocol For Wireless Sensor Network Applications, B.K. Singh, Kemal Tepe
A Novel Real-Time Mac Layer Protocol For Wireless Sensor Network Applications, B.K. Singh, Kemal Tepe
Electrical and Computer Engineering Publications
This paper presents a comparative study of existing real-time MAC layer protocols for wireless sensor networks. Then, a new real-Time MAC protocol is presented that is based on a general purpose MAC protocol, called S-MAC. While medium access strategy in S-MAC is based on contention and back-off schemes, protocol proposed in this paper uses feedback approach as a medium access strategy. As a result of this, it increases consistency in data transmission pattern, which enables it to guarantee end-to-end delay deadlines for soft realtime applications. Proposed protocol works in continuous ON mode of operation at MAC layer and is intended …
Software Product Line Engineering: Future Research Directions, Luiz Fernando Capretz, Faheem Ahmed
Software Product Line Engineering: Future Research Directions, Luiz Fernando Capretz, Faheem Ahmed
Electrical and Computer Engineering Publications
The recent trend of switching from single software product development to
lines of software products in the software industry has made the software product line concept viable and widely accepted methodology in the future. Some of the potential benefits of this approach include cost reduction, improvement in quality and a decrease in product development time. Many organizations that deal in wide areas of operation, from consumer electronics, telecommunications, and avionics to information technology, are using software product lines practice because it deals with effective utilization of
software assets and provides numerous benefits. Software product line engineering is an inter-disciplinary concept. …
A Multicultural Comparison Of Engineering Students: Implications To Teaching And Learning, Zaki Shkair Seddigi, Luiz Fernando Capretz, David House
A Multicultural Comparison Of Engineering Students: Implications To Teaching And Learning, Zaki Shkair Seddigi, Luiz Fernando Capretz, David House
Electrical and Computer Engineering Publications
Problem statement: Personality considerations have become increasingly important in recent years, but studies involving the personality characteristics of engineers have been scarcely reported. Engineers today are expected to have a broader range of skills than in the recent past because users are now equally concerned with the technical as well as the personal services provided by engineers. Approach: A multicultural personality profile of engineering students had been presented in this study. The MBTI was used as an instrument to sort personality types of engineering students at both King Fahd University of Petroleum and Minerals in Saudi Arabia and University of …
Internal Quantum Efficiency Of C-Plane Ingan And M-Plane Ingan On Si And Gan, X. Ni, J. Lee, M. Wu, X. Li, Ryoko Shimada, Ü. Özgür, A. A. Baski, Hadis Morkoç, T. Paskova, G. Mulholland, K. R. Evans
Internal Quantum Efficiency Of C-Plane Ingan And M-Plane Ingan On Si And Gan, X. Ni, J. Lee, M. Wu, X. Li, Ryoko Shimada, Ü. Özgür, A. A. Baski, Hadis Morkoç, T. Paskova, G. Mulholland, K. R. Evans
Electrical and Computer Engineering Publications
We investigated internal quantum efficiency (IQE) of polar (0001) InGaN on c-sapphire, and (11¯00) nonpolar m-plane InGaN on both m-plane GaN and specially patterned Si. The IQE values were extracted from the resonant photoluminescence intensity versus the excitation power. Data indicate that at comparable generatedcarrier concentrations the efficiency of the m-plane InGaN on patterned Si is approximately a factor of 2 higher than that of the highly optimized c-plane layer. At the highest laser excitation employed (∼1.2×1018 cm−3), the IQE of m-plane InGaN double heterostructure on Si is approximately 65%. We believe that the m-plane would remain inherently advantageous, particularly …
Degradation In Inaln/Gan-Based Heterostructure Field Effect Transistors: Role Of Hot Phonons, J. H. Leach, C. Y. Zhu, M. Wu, X. Ni, X. Li, J. Xie, Ü. Özgür, Hadis Morkoç, J. Liberis, E. Šermukšnis, A. Matulionis, H. Cheng, Ç. Kurdak
Degradation In Inaln/Gan-Based Heterostructure Field Effect Transistors: Role Of Hot Phonons, J. H. Leach, C. Y. Zhu, M. Wu, X. Ni, X. Li, J. Xie, Ü. Özgür, Hadis Morkoç, J. Liberis, E. Šermukšnis, A. Matulionis, H. Cheng, Ç. Kurdak
Electrical and Computer Engineering Publications
We report on high electric field stress measurements at room temperature on InAlN/AlN/GaN heterostructure field effect transistor structures. The degradation rate as a function of the average electron density in the GaN channel (as determined by gated Hall bar measurements for the particular gate biases used), has a minimum for electron densities around 1×1013 cm−2, and tends to follow the hot phonon lifetime dependence on electron density. The observations are consistent with the buildup of hot longitudinal optical phonons and their ultrafast decay at about the same electron density in the GaN channel. In part because they have negligible group …
On Carrier Spillover In C- And M-Plane Ingan Light Emitting Diodes, J. Lee, X. Li, X. Ni, Ü. Özgür, Hadis Morkoç, T. Paskova, G. Mulholland, K. R. Evans
On Carrier Spillover In C- And M-Plane Ingan Light Emitting Diodes, J. Lee, X. Li, X. Ni, Ü. Özgür, Hadis Morkoç, T. Paskova, G. Mulholland, K. R. Evans
Electrical and Computer Engineering Publications
The internal quantum efficiency(IQE) and relative external quantum efficiency (EQE) in InGaNlight-emitting diodes(LEDs) emitting at 400 nm with and without electron blocking layers (EBLs) on c-plane GaN and m-plane GaN were investigated in order to shed some light on any effect of polarizationcharge induced field on efficiency killer carrier spillover. Without an EBL the EQE values suffered considerably (by 80%) for both orientations, which is clearly attributable to carrier spillover. Substantial carrier spillover in both polarities, therefore, suggests that the polarizationcharge is not the major factor in efficiency degradation observed, particularly at high injection levels. Furthermore, the m-plane variety with …
Epitaxial Growth Of (001)-Oriented Ba0.5sr0.5tio3 Thin Films On A-Plane Sapphire With An Mgo/Zno Bridge Layer, Bo Xiao, Hongrui Liu, Vitaliy Avrutin, Jacob H. Leach, Emmanuel Rowe, Huiyong Liu, Ü. Özgür, Hadis Morkoç, W. Chang, L.M. B. Allredge, S. W. Kirchoefer, J. M. Pond
Epitaxial Growth Of (001)-Oriented Ba0.5sr0.5tio3 Thin Films On A-Plane Sapphire With An Mgo/Zno Bridge Layer, Bo Xiao, Hongrui Liu, Vitaliy Avrutin, Jacob H. Leach, Emmanuel Rowe, Huiyong Liu, Ü. Özgür, Hadis Morkoç, W. Chang, L.M. B. Allredge, S. W. Kirchoefer, J. M. Pond
Electrical and Computer Engineering Publications
High quality (001)-oriented Ba0.5Sr0.5TiO3 (BST) thin films have been grown on a-plane sapphire(112¯0) by rf magnetron sputtering using a double bridge layer consisting of (0001)-oriented ZnO (50 nm) and (001)-oriented MgO (10 nm) prepared by plasma-assisted molecular beam epitaxy. X-ray diffraction revealed the formation of three sets of in-plane BST domains, offset from one another by 30°, which is consistent with the in-plane symmetry of the MgO layer observed by in situ reflective high electron energy diffraction. The in-plane epitaxial relationship of BST, MgO, and ZnO has been determined to be BST [110]//MgO [110]//ZnO [112¯0] and BST [110]/MgO [110]//ZnO [11¯00]. …
Plasmon-Enhanced Heat Dissipation In Gan-Based Two-Dimensional Channels, A. Matulionis, J. Liberis, I. Matulioniene, M. Ramonas, E. Šermukšnis, J. H. Leach, M. Wu, X. Ni, X. Li, Hadis Morkoç
Plasmon-Enhanced Heat Dissipation In Gan-Based Two-Dimensional Channels, A. Matulionis, J. Liberis, I. Matulioniene, M. Ramonas, E. Šermukšnis, J. H. Leach, M. Wu, X. Ni, X. Li, Hadis Morkoç
Electrical and Computer Engineering Publications
Decay of nonequilibrium longitudinal optical (LO) phonons is investigated at room temperature in two-dimensional electron gas channels confined in nearly lattice-matched InAlN/AlN/GaN structures. A nonmonotonous dependence of the LO-phonon lifetime on the supplied electric power is reported for the first time and explained in terms of plasmon–LO-phonon resonance tuned by applied bias at a fixed sheet density (8×1012 cm−2). The shortest lifetime of 30±15 fs is found at the power of 20±10 nW/electron.
Nonpolar M-Plane Gan On Patterned Si(112) Substrates By Metalorganic Chemical Vapor Deposition, X. Ni, M. Wu, J. Lee, X. Li, A. A. Baski, Ü. Özgür, Hadis Morkoç
Nonpolar M-Plane Gan On Patterned Si(112) Substrates By Metalorganic Chemical Vapor Deposition, X. Ni, M. Wu, J. Lee, X. Li, A. A. Baski, Ü. Özgür, Hadis Morkoç
Electrical and Computer Engineering Publications
The concept of nonpolar (11¯00) m-plane GaN on Si substrates has been demonstrated by initiating growth on the vertical (1¯1¯1) sidewalls of patterned Si(112) substrates using metalorganic chemical vapor deposition. The Si(112) substrates were wet-etched to expose {111} planes using stripe-patterned SiNx masks oriented along the [1¯10] direction. Only the vertical Si(1¯1¯1) sidewalls were allowed to participate in GaNgrowth by masking other Si{111} planes using SiO2, which led to m-plane GaNfilms.Growth initiating on the Si(1¯1¯1) planes normal to the surface was allowed to advance laterally and also vertically toward full coalescence. InGaN double heterostructure active layers grown on these m-GaN …
Nanoelectrospray Aerosols From Microporous Polymer Wick Sources, Gary C. Tepper, Royal Kessick
Nanoelectrospray Aerosols From Microporous Polymer Wick Sources, Gary C. Tepper, Royal Kessick
Electrical and Computer Engineering Publications
Nanoelectrospray aerosols were formed from microporous polymer wick sources. Current-voltage characteristics were measured as a function of solution electrical conductivity and surface tension and two distinct electrospray modes were observed. In the first mode, when the maximum capillary flow rate through the wick exceeds the electrospray flow rate, a single electrospray forms from a droplet at the end of the wick. In the second mode, when the maximum capillary flow rate is less than the electrospray flow rate, a multitude of microscopic nanoelectrospray sources are formed from within the surface of the wick tip.
Retraction: “Observation Of Numerous E2 Mode Phonon Replicas In The Room Temperature Photoluminescence Spectra Of Zno Nanowires: Evidence Of Strong Deformation Potential Electron-Phonon Coupling” [Appl. Phys. Lett.89, 143121 (2006)], S. Ramanathan, Supriyo Bandyopadhyay, L. K. Hussey, M. Muñoz
Retraction: “Observation Of Numerous E2 Mode Phonon Replicas In The Room Temperature Photoluminescence Spectra Of Zno Nanowires: Evidence Of Strong Deformation Potential Electron-Phonon Coupling” [Appl. Phys. Lett.89, 143121 (2006)], S. Ramanathan, Supriyo Bandyopadhyay, L. K. Hussey, M. Muñoz
Electrical and Computer Engineering Publications
No abstract provided.
Effect Of Large Strain On Dielectric And Ferroelectric Properties Of Ba0.5sr0.5tio3 Thin Films, Bo Xiao, Vitaliy Avrutin, Hongrui Liu, Emmanuel Rowe, Jacob H. Leach, Xing Gu, Ü. Özgür, Hadis Morkoç, W. Chang, L. M.B. Alldredge, S. W. Kirchoefer, J. M. Pond
Effect Of Large Strain On Dielectric And Ferroelectric Properties Of Ba0.5sr0.5tio3 Thin Films, Bo Xiao, Vitaliy Avrutin, Hongrui Liu, Emmanuel Rowe, Jacob H. Leach, Xing Gu, Ü. Özgür, Hadis Morkoç, W. Chang, L. M.B. Alldredge, S. W. Kirchoefer, J. M. Pond
Electrical and Computer Engineering Publications
BaxSr1−xTiO3 is ideally suited as a tunable medium for radio frequency passive component. In this context we have studied the effect of biaxial strain on the dielectric and ferroelectricproperties of Ba0.5Sr0.5TiO3thin filmsgrown epitaxially on SrTiO3 (001) substrates. The lattice parameters of the films determined by high-resolution x-ray diffraction with the thickness varying from 160 to 1000 nm indicated large biaxial compressive strain which decreased from 2.54% to 1.14% with increasing film thickness. Temperature-dependent measurements of the dielectric constant in our strained Ba0.5Sr0.5TiO3thin films revealed a significant increase in the Curie temperature as the film thickness is below 500 nm. Enhanced …
Energy Relaxation Probed By Weak Antilocalization Measurements In Gan Heterostructures, H. Cheng, N. Biyikli, J. Xie, Ç. Kurdak, H. Morkoç
Energy Relaxation Probed By Weak Antilocalization Measurements In Gan Heterostructures, H. Cheng, N. Biyikli, J. Xie, Ç. Kurdak, H. Morkoç
Electrical and Computer Engineering Publications
Energy relaxation and electron-phonon (e-p) interaction are investigated in wurtzite Al0.15Ga0.85N/AlN/GaN and Al0.83In0.17N/AlN/GaN heterostructures with polarization induced two-dimensional electron gases in the Bloch–Grüneisen regime. Weak antilocalization (WAL) and Shubnikov–de Haas measurements were performed on gated Hall bar structures at temperatures down to 0.3 K. We used WAL as a thermometer to measure the electron temperature Te as a function of the dc bias current. We found that the power dissipated per electron, Pe, was proportional to T4e due to piezoelectric acoustic phonon emission by hot electrons. We calculated Pe as a function of Te without any adjustable parameters for both …
Correlated Growth Of Organic Material Tris (8-Hydroxyquinoline) Aluminum (Alq3) And Its Relation To Optical Properties, Bhargava R. Kanchibotla, K. Garre, Deeder Aurongzeb
Correlated Growth Of Organic Material Tris (8-Hydroxyquinoline) Aluminum (Alq3) And Its Relation To Optical Properties, Bhargava R. Kanchibotla, K. Garre, Deeder Aurongzeb
Electrical and Computer Engineering Publications
We report slow correlated growth mode in energetic cluster vapor deposited organic light emissive material tris(8-hydroxyquinoline) aluminum from 5 to 100 nm. Phase modulated atomic force microscopy shows very slow grain growth with thickness, with very small phase differences within the film.Fractal dimension calculated from correlation function shows growth process above 10 nm consistent with diffusion-limited aggregation. For low thickness (5 nm), photoluminescence measurement shows the emission peak is shifted by ∼0.4 eV toward lower wavelength.
Electron Drift Velocity In Lattice-Matched Alinn/Aln/Gan Channel At High Electric Fields, L. Ardaravičius, M. Ramonas, J. Liberis, O. Kiprijanovič, A. Matulionis, J. Xie, M. Wu, J. H. Leach, H. Morkoç
Electron Drift Velocity In Lattice-Matched Alinn/Aln/Gan Channel At High Electric Fields, L. Ardaravičius, M. Ramonas, J. Liberis, O. Kiprijanovič, A. Matulionis, J. Xie, M. Wu, J. H. Leach, H. Morkoç
Electrical and Computer Engineering Publications
Hot-electron transport was probed by nanosecond-pulsed measurements for a nominally undoped two-dimensional channel confined in a nearly lattice-matched Al0.82In0.18N/AlN/GaN structure at room temperature. The electric field was applied parallel to the interface, the pulsed technique enabled minimization of Joule heating. No current saturation was reached at fields up to 180 kV/cm. The effect of the channel length on the current is considered. The electron drift velocity is deduced under the assumption of uniform electric field and field-independent electron density. The highest estimated drift velocity reaches ∼3.2×107 cm/s when the AlN spacer thickness is 1 nm. At high fields, a weak …
Game Theoretic Approach In Routing Protocol For Wireless Ad Hoc Networks, Mohammad Naserian, Kemal Tepe
Game Theoretic Approach In Routing Protocol For Wireless Ad Hoc Networks, Mohammad Naserian, Kemal Tepe
Electrical and Computer Engineering Publications
This paper introduces a game theoretic method, called forwarding dilemma game (FDG), which controls routing overhead in dense multi-hop wireless ad hoc networks. The players of the game are the wireless nodes with set of strategies {Forward, Not forward}. The game is played whenever an arbitrary node in the network receives a flooding packet. In FDG, every player needs to know the number of players of the game. That is why a neighbor discovery protocol (NDP) is introduced. In order for NDP to function, a field is attached to the flooding packets (routing overhead packets). The mixed strategy Nash equilibrium …