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Gate-length and drain-bias dependence of band-to-band tunneling-induced drain leakage in irradiated fully depleted SOI devices

Gate-length and drain-bias dependence of band-to-band tunnel...

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作者： Mamouni, Farah E. Dixit, Sriram K. Schrimpf, Ronald D. Adell, Philippe C. Esqueda, Ivan S. McLain, Michael L. Barnaby, Hugh J. Cristoloveanu, Sorin Xiong, Weize Electrical Engineering and Computer Science Department Vanderbilt University Nashville TN 37232 United States Interdisciplinary Materials Science Program Vanderbilt University Nashville TN 37235 United States Jet Propulsion Laboratory Pasadena CA 91109 United States Department of Electrical Engineering Arizona State University Tempe AZ 85287 United States IMEP-INP Grenoble MINATEC 38016 Grenoble France Texas Instruments Inc. Dallas TX 75808 United States

The effects of gate length and drain bias on the off-state drain leakage current of irradiated fully-depleted SOI $n$-channel MOSFETs are reported. The experimental results are interpreted using a model based on the combined effects of band-to-band tunneling (BBT) and the trapped charge in the buried oxide. For negative gate-source voltages, the drain leakage current increases with the drain voltage because the electric field in the gate-to-drain overlap region is increasing. The off-state current in these devices increases with total ionizing dose due to oxide trapped charge build up in the buried oxide, enhanced by the BBT mechanism. The experimental data show that these effects are more significant for devices with shorter gate-lengths. Simulation results suggest that the BBT-generated holes are more likely to drift all the way from the drain to the source in shorter devices, enhancing the drain leakage current, while they tend to tunnel across the gate oxide in longer devices. © 2006 IEEE.

关键词： MOSFET devices

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Nanoscale porous silicon waveguides for biosensing applications

Nanoscale porous silicon waveguides for biosensing applicati...

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21st Annual Meeting of the IEEE Lasers and Electro-Optics Society, LEOS 2008

作者： Rong, G. Wei, X. Kang, C. Liscidini, M. Sipe, J.E. Mernaugh, R.L. Weiss, S.M. Department of Electrical Engineering and Computer Science Vanderbilt University Nashville TN 37235 United States Interdisciplinary Graduate Program in Materials Science Vanderbilt University Nashville TN 37235 United States Department of Physics Institute for Optical Sciences University of Toronto Toronto ON M5S 1A7 Canada Department of Biochemistry Vanderbilt University Nashville TN 37235 United States

Nanoscale porous silicon waveguides, both on silicon substrates and free-standing membranes, are explored for biosensing applications. Measured detection limits in the nanomolar range are reported for DNA sensing. ... 详细信息

ISBN: (纸本)9781424419326

关键词： Porous silicon

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Material analysis and characterization of cesium iodide (CsI) coated C fibers for field emission applications

Material analysis and characterization of cesium iodide (CsI...

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IEEE International Conference on Plasma Science (ICOPS)

作者： Vasilios Vlahos Dane Morgan John H. Booske Interdisciplinary Materials Science Program Madison WI USA University of Wisconsin Madison Madison WI US Department of Electrical and Computer Engineering University of Wisconsin Madison Madison WI USA

Field emission cathodes consisting of cesium iodide (CsI) coated graphite fibers have been investigated as promising electron sources for high power microwave (HPM) devices. After conditioning for removing adsorbed water vapor, these cathodes have operated stably for more than one million pulses and release little or no plasma. One of the most useful properties of the Csl coatings appears to be a significant reduction in turn-on electric fields compared to un-coated graphite fiber cathodes. Computational investigations of the modification of the electronic properties of a C surface upon adsorption of both isolated and crystalline thin layers of Csl have been performed, indicating that these adsorbed layers are capable of significantly improving the emission properties of the C fibers by forming surface dipole layers . These layers are predicted to alter the electrostatic potential barrier for electron emission of the surface and lower the overall work function of the system from ~4.5 eV (pure graphite) down to ~1.2 - 1.4 eV. In order to further correlate the microscopic properties of the material system with the computational results obtained and the macroscopic performance characteristics of these cathodes, a series of materials characterizations are being carried out on the cathodes. These studies will facilitate the determination of both bulk and surface elemental composition of the cathodes, provide the value of the surface work function, determine the micro-morphological characteristics of the cathode's surface as well as the micro-structural characteristics of the bulk, and identify the role of any interface regions on the emission properties of the cathode. A more complete understanding of the mechanism(s) responsible for the superior emission characteristics of Csl coated C fibers and the nano-physics of the system will be obtained.

关键词： Cathodes Surface morphology Materials Optical fiber devices Plasmas Coatings Surface treatment

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Nanoscale porous silicon waveguides for biosensing applications

Nanoscale porous silicon waveguides for biosensing applicati...

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IEEE Photonics Conference (IPC)

作者： G. Rong X. Wei C. Kang M. Liscidini J. E. Sipe R. L. Mernaugh S. M. Weiss Department of Electrical Engineering and Computer Science Vanderbilt University Nashville TN USA Interdisciplinary Graduate Program in Materials Science Vanderbilt University Nashville TN USA Department of Physics and Institute for Optical Sciences University of Toronto Toronto ONT Canada Department of Biochemistry Vanderbilt University Nashville TN USA

关键词： Silicon Biosensors Optical waveguides Gratings Biomembranes Resonance DNA Biological materials Optical materials Optical surface waves

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Trends and precedents favoring a regulatory embrace of smart radio technologies

Trends and precedents favoring a regulatory embrace of smart...

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2nd IEEE International Symposium on New Frontiers in Dynamic Spectrum Access Networks, DySpan 2007

作者： Bernthal, J. Brad Brown, Timothy X. Hatfield, Dale N. Sicker, Douglas C. Tenhula, Peter A. Weiser, Philip J. Interdisciplinary Telecommunication Program Law School University of Colorado Boulder United States Interdisciplinary Telecommunication Program Electrical and Computer Engineering Department University of Colorado Boulder United States Interdisciplinary Telecommunication Program University of Colorado Boulder United States Department of Computer Science Interdisciplinary Telecommunication Program University of Colorado Boulder United States Shared Spectrum Company Vienna VA United States

ISBN: (纸本)1424406633

Burgeoning demands for communications bandwidth stress the abilities of military and civil spectrum managers to provide needed access to spectrum resources while taking appropriate measures to avoid causing harmful interference to legacy users. Empirical analysis shows that radio frequency (RF) bandwidth is often available: measurement data indicate that while most channels are used at some times, most channels remain unused at any given time. Going forward, so-called "smart radio" technologies will be able to exploit these holes in the RF spectrum and will play a crucial role in achieving the core objectives of efficient spectrum management. The United States Defense Advanced Research Projects Agency's ("DARPA") NeXt Generation Communications program ("XG") is on the vanguard of smart radio innovations. In particular, XG technology uses automated intelligence at a system's edges in order to navigate real-time fluctuations in spectral conditions that cannot be precisely predicted in advance. This dynamism will enable opportunistic use of intermittently available spectrum. This paper examines how the introduction of smart radio technologies fit within past precedents and current regulatory developments involving shared use of spectrum resources. The key finding is that implementation of smart radios in the near term would represent an incremental policy step that is consistent with policy trends and recent regulatory actions. Two perspectives militate in favor of this conclusion. First, smart radio systems enable regulators and spectrum managers to more efficiently achieve long-held policy and spectrum management objectives. And second, the regulatory prospects of smart radios are further buoyed by contemporary examples of approved technologies and sharing methods that are modest precursors to XG. Case studies are used to underscore that while smart radios promote vast gains in spectrum accessibility and interference avoidance, implementation of smart radio systems f

关键词： Radio communication

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Cooperative university/industry development of a freshman 'introduction to ECE design' course

Cooperative university/industry development of a freshman 'i...

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114th Annual ASEE Conference and Exposition, 2007

作者： Williams, Douglas Butera, Robert Uluagac, Selcuk Clark, Matthew Deck, Andy Torba, Michael Trahan, Steven Georgia Institute of Technology United States Undergraduate Affairs School of Electrical and Computer Engineering Georgia Tech. Georgia Department of Electrical and Computer Engineering Interdisciplinary Bioengineering Graduate Program Georgia Tech. United States Georgia Tech. School of Electrical and Computer Engineering United States National Instruments National Instruments Austin TX United States

Faculty members from Georgia Tech's School of electrical and computer engineering (ECE) have worked jointly with engineers from National Instruments (NI) to develop a new freshman engineering course. This course is entitled 'Introduction to ECE Design' and is constructed around the use of the LEGO MINDSTORMS NXT robotics system. NI partnered with LEGO to jointly develop the programming software for the MINDSTORMS NXT, and their engineers are uniquely positioned to provide insight into the use and functionality of these kits. NI engineers have not only provided technical support but have also conceived and designed most of the laboratories for the course. This course addresses the diverse objectives of providing students with a systems-level design experience at the beginning of their academic programs and introducing them to a broad range of ECE disciplines. A primary goal is to enable students to make better-informed decisions when choosing whether or not to major in electrical engineering or computer engineering. © American Society for engineering Education, 2007.

关键词： Systems engineering

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New Insights in the Modification of the Work Function of Cathode Materials due to Thin Surface Coatings using Ab-initio Modelling

New Insights in the Modification of the Work Function of Cat...

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International Conference on Vacuum Electronics

作者： Vasilios Vlahos Dane D. Morgan John H. Booske University of Wisconsin Madison Madison WI USA 1415 Engineering Dr. Madison WI Department of Materials Science and Engineering University of Wisconsin Madison Madison WI USA Department of Materials Science and Engineering Department of Electrical and Computer Engineering University of Wisconsin-Madison Madison USA Interdisciplinary Materials Science Program

The changes in the work function upon adsorption of coating layers on materials utilized in both field and thermionic emission applications have been investigated computationally within the framework of Density Functional Theory (DFT) [1] as implemented by the Vienna Ab-initio Simulation Package (VASP) [2]. This approach provides valuable information for understanding the origin of the improvement in the emitted current density by monitoring changes in the electronic structure of a material system upon adsorption of surface species. The presence of surface coatings induces changes in the charge density in the surface and sub-surface regions of the substrate, significantly influencing the value of the work function. The origin of the enhanced emission properties of Cesium-Iodide (Csl) coated Carbon-based field emission cathodes [3] as well as Barium-Oxide (Ba-O) Tungsten thermionic cathode systems has been investigated. The former is a promising cathode material system capable of operating under low global electric fields, demonstrating operation lifetimes in excess of one million pulses, and characterized by good shot-to-shot-reproducibility, low levels of outgassing, and no evident plasma formation upon appropriate conditioning.

关键词： Cathodes Coatings Thermionic emission Density functional theory Computational modeling Electronic packaging thermal management Current density Monitoring Tungsten Plasma applications

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Design and analysis of an adaptive, global strategy for detecting and mitigating distributed DoS attacks in GRID environments

Design and analysis of an adaptive, global strategy for dete...

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39th Annual Simulation Symposium, 2006

作者： Znati, Taieb Amadei, James Pazehoski, Daniel R. Sweeny, Scott Department of Computer Science Telecommunication Program Department of Electrical and Computer Engineering

ISBN: (纸本)0769525598

Basic protection schemes against Denial-of-Service (DoS) are based on a perimeter-based model, where attacks are dealt with after they occur. This is quite often too late to prevent damage or loss of resources and service. The focus of this paper is to investigate a distributed defense method that can neutralize the attack before it reaches the potential target in mass. In order to effectively implement this method, this paper proposes a progressive, globally deployable sentinel scheme for data sampling, packet inspection, and DoS attack detection and recovery. A simulation framework is developed to study the performance of the proposed scheme. The results show a significant improvement in how the network deals with DoS attacks, in comparison to local DoS detection and prevention schemes. © 2006 IEEE.

关键词： computer crime

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A constant revenue model for telecommunication networks

A constant revenue model for telecommunication networks

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International Conference on Networking, International Conference on Systems andInternational Conference on Mobile Communications and Learning Technologies, ICN/ICONS/MCL'06

作者： Sukasdadi, Hapsara R. Verma, Pramode K. Graduate Program in Telecommunication System Department of Electrical and Computer Engineering

ISBN: (纸本)0769525520

It is well known that the quality of service provided by a telecommunication network as measured by the probability of blocking decreases rapidly when the incident traffic exceeds the design limits of the network. A higher probability of blocking results in reduced throughput and loss of revenue for the service provider. This paper presents a mechanism that introduces priority in a telephone system with the objective of providing a defined grade of service to priority traffic carrying a higher price tag. The non-priority traffic carries a lower price tag and a lower grade of service. The proposed pricing scheme maintains the overall revenue associated with the network at a constant level over a wide range of incident traffic. © 2006 IEEE.

关键词： telecommunication networks

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Jamming and sensing of encrypted wireless ad hoc networks 06

Jamming and sensing of encrypted wireless ad hoc networks

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7th ACM International Symposium on Mobile Ad Hoc Networking and Computing, MOBIHOC 2006

作者： Brown, Timothy X. James, Jesse E. Sethi, Amita Interdisciplinary Telecommunication Program Dept. of Electrical and Computer Engineering University of Colorado Boulder CO 80309-0530 United States

ISBN: (纸本)1595933689

This paper considers the problem of an attacker disrupting an encrypted victim wireless ad hoc network through jamming. Jamming is broken down into layers and this paper focuses on jamming at the Transport/Network layer. Jamming at this layer exploits AODV and TCP protocols and is shown to be very effective in simulated and real networks when it can sense victim packet types, but the encryption is assumed to mask the entire header and contents of the packet so that only packet size, timing, and sequence is available to the attacker for sensing. A sensor is developed and tested on live data. The classification is found to be highly reliable for many packet types. The relative roles of size, timing, and sequence are discussed along with the implications for making networks more secure. Copyright 2006 ACM.

关键词： telecommunication networks

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