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New class of cryptographic primitives and cipher design for networks security

International Journal of Network Security 2006年第2期2卷 114-125页

作者： Moldovyan, Nikolay A. Moldovyan, Alexander A. Eremeev, Michael A. Sklavos, Nicolas Specialized Center of Program Systems SPECTR Kantemirovskaya Str. 10 St. Petersburg 197342 Russia Electrical and Computer Engineering Department University of Patras Greece

This work focuses the problem of increasing the integral implementation efficacy of block ciphers. It proposes a new approach to the cipher design, suitable to applications, where constrained resources are available to embedded security mechanisms, such as ad-hoc, sensor and wireless networks. The paper develops the cipher design approach based on the use of datadependent (DD) operations (DDOs). A new class of DDO based on the advanced controlled elements (CEs) is introduced, which is proven well suited to hardware implementations, for ASIC and FPGA devices. Classification of the CEs and properties of some new DDOs are also presented. A new DDO-based cipher design is considered, which is more efficient for VLSI implementation than AES finalists and other known DDO-based ciphers. For the proposed cipher, Eagle-128, both ASIC and FPGA implementation results are presented. Finally comparisons with other published implementations are illustrated, using the Performance/Cost ratio and Performance/(Cost*Frequency) ratio indices.

关键词： Network security

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Mobile path loss prediction model for forest areas using MIMO fuzzy logic system

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WSEAS Transactions on Communications 2006年第9期5卷 1807-1812页

作者： Phaiboon, Supachai Phokharatkul, Pisit Kittitummawong, Piti Somkuarnpanit, Suripon Electrical Engineering Department Faculty of Engineering Mahidol University Phutthamonthon Nakornprathom 73170 Thailand Computer Engineering Department Faculty of Engineering Mahidol University Phutthamonthon Nakornprathom 73170 Thailand Information Technology Management Program Faculty of Engineering Mahidol University Phutthamonthon Nakornprathom 73170 Thailand Electronic Department Faculty of Engineer KinkMonkul Institute of Technology Ladkrabang Ladkrabang Bangkok Thailand

This paper proposes a method to predic mobile path loss in forests using MIMO fuzzy logic system. The multi-input was classified into seven input parameters defined as, X1 is number of trees/m2 and X2 to X7 are tree structure parameters. These crisp inputs are classified by fuzzifier to fuzzy sets and then inferenced using fuzzy linguistic rule base into multi - output path loss slopes via de-fuzzifier. For this study, we classified the terrains into high-, medium-, low- density and grass area and used the simple linguistic rules for prediction the path loss slopes. We performed measurements in different forest densities at a frequency of 1.8 GHz with base station antenna height in a range of 3, 4, and 5 m above ground while the receiving antenna height was fixed at 1.8 m above ground. The results have shown that fuzzy logic approach provides more accurate prediction of path loss slopes than that of conventional empirical mathematic model. The proposed models will be useful for the local wireless network and micro-cell design of mobile communication systems in forests.

关键词： Signal interference

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Multiday electrophysiological recordings from freely behaving primates

Multiday electrophysiological recordings from freely behavin...

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28th Annual International Conference of the IEEE engineering in Medicine and Biology Society, EMBS'06

作者： Gilja, Vikash Linderman, Michael D. Santhanam, Gopal Afshar, Afsheen Ryu, Stephen Meng, Teresa H. Shenoy, Krishna V. Department of Electrical Engineering Stanford University Stanford CA United States Department of Computer Science Stanford University Stanford CA United States School of Medicine Stanford University Stanford CA United States Department of Neurosurgery Stanford University Stanford CA United States Neurosciences Program Stanford University Stanford CA United States

ISBN: (纸本)1424400325

Continuous multiday broadband neural data provide a means for observing effects at fine timescales over long periods. In this paper we present analyses on such data sets to demonstrate neural correlates for physically active and inactive time periods, as defined by the response of a head-mounted accelerometer. During active periods, we found that 5-25 Hz local field potential (LFP) power was significantly reduced, firing rate variability increased, and firing rates have greater temporal correlation. Using a single threshold fit to LFP power, 93% of the 403 5 minute blocks tested were correctly classified as active or inactive (as labeled by thresholding each block's maximal accelerometer magnitude). These initial results motivate the use of such data sets for testing neural prosthetics systems and for finding the neural correlates of natural behaviors. © 2006 IEEE.

关键词： Electrophysiology

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Vertically aligned carbon nanotube field emission devices fabricated by furnace thermal chemical vapor deposition at atmospheric pressure

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Journal of Vacuum Science and Technology B: Microelectronics and Nanometer Structures 2006年第3期24卷 1190-1196页

作者： Wei, S. Kang, W.P. Davidson, J.L. Choi, B.K. Huang, J.H. Interdisciplinary Program in Materials Science Vanderbilt University Nashville TN 37235 Department of Electrical Engineering and Computer Science Vanderbilt University Nashville TN 37235 Department of Materials Science and Engineering National Tsing Hua University Hsinchu 300 Taiwan

Multiwalled carbon nanotubes (CNTs) grown by thermal chemical vapor deposition (CVD) in a tube furnace at atmospheric pressure are reported. The CNTs were synthesized at 750 °C using C2 H2 as the carbon source and a mixture of Ar H2 (80 vol %:20 vol %) as a carrier gas, with N H3 serving as a processing reagent. The catalytic properties of nickel (Ni) particles are strongly affected by the CVD process parameters and this effect is reflected in the morphologies and field emission behaviors of the as-grown CNTs. The flow rate ratio of N H3 to C2 H2 is found to be critical to the formation of vertically aligned CNTs, which demonstrated better field emission characteristics than the randomly oriented nanotubes. The successful synthesis of vertically aligned CNTs at atmospheric pressure in a tube furnace is beneficial for large area mass production such as flat panel field emission displays at lower cost. © 2006 American Vacuum Society.

关键词： Field emission displays

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Neural recording stability of chronic electrode arrays in freely behaving primates

Neural recording stability of chronic electrode arrays in fr...

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28th Annual International Conference of the IEEE engineering in Medicine and Biology Society, EMBS'06

作者： Linderman, Michael D. Gilja, Vikash Santhanam, Gopal Afshar, Afsheen Ryu, Stephen Meng, Teresa H. Shenoy, Krishna V. Department of Electrical Engineering Stanford University Stanford CA United States Department of Computer Science Stanford University Stanford CA United States School of Medicine Stanford University Stanford CA United States Department of Neurosurgery Stanford University Stanford CA United States Neurosciences Program Stanford University Stanford CA United States

ISBN: (纸本)1424400325

Chronically implanted electrode arrays have enabled a broad range of advances, particularly in the field of neural prosthetics. Those successes motivate development of prototype implantable prosthetic processors for long duration, continuous use in freely behaving subjects. However, traditional experimental protocols have provided limited information regarding the stability of the electrode arrays and their neural recordings. In this paper we present preliminary results derived from long duration neural recordings in a freely behaving primate which show variations in action potential shape and RMS noise across a range of time scales. These preliminary results suggest that spike sorting algorithms can no longer assume stable neural signals and will need to transition to adaptive signal processing methodologies to maximize performance. ©2006 IEEE.

关键词： Prosthetics

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Three-dimensional visualization of lymph node morphology using OCT

Three-dimensional visualization of lymph node morphology usi...

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Biomedical Topical Meeting, BIO 2006

作者： Nguyen, Freddy T. Luo, Wei Zysk, Adam M. Ralston, Tyler S. Chaney, Eric J. Marks, Daniel L. Oldenburg, Amy L. Brockenbrough, John Boppart, Stephen A. Department of Chemistry Medical Scholars Program College of Medicine Beckman Institute for Advanced Science and Technology United States Department of Electrical and Computer Engineering Beckman Institute for Advanced Science and Technology United States Carle Foundation Hospital College of Medicine United States 405 North Mathews Avenue Urbana Illinois 61801 United States

We report the first demonstration of OCT for the three-dimensional visualization of lymph node morphology and microarchitecture from human and carcinogen-induced rat mammary tumor specimens. © 2006 Optical Societ... 详细信息

ISBN: (纸本)1557528071

关键词： Body fluids

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Social and Ethical Implications of engineering Design: A Learning Module Developed for ECE Capstone Design Courses

Social and Ethical Implications of Engineering Design: A Lea...

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Frontiers in Education (FIE) Conference

作者： Luis O. Jimenez Efrain O'Neill-Carrillo William Frey Rafael Rodriguez-Solis Agustin Irizarry-Rivera Shawn Hunt EAC Program Development Electrical and Computer Engineering Department University of Puerto Rico MayagÜez Puerto Rico Electrical and Computer Engineering Department University of Puerto Rico MayagÜez Puerto Rico Center for Ethics in the Professions University of Puerto Rico MayagÜez Puerto Rico

The School of engineering at the University of Puerto Rico-Mayaguez (UPRM), has developed a module to integrate ethics into capstone design courses in the electrical and computer engineering (ECE) department. This module entitled, "Social and Ethical Implications of engineering Design", helps students to reflect on issues and challenges associated with technological education that include (i) professional integrity, (ii) engineering, industry and social responsibility, and (iii) technological impact, societal and global awareness. This paper will describe this module and show how it has been implemented in ECE design courses in digital signal processing, power systems, applied electromagnetics, and electrical systems design. It also discusses student response by reporting student-based assessment results

关键词： Design engineering Educational technology Social implications of technology Ethics computer science education Power engineering and energy Signal design Digital signal processing Power systems Electromagnetics

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Show them nand gates and they will come

Show them nand gates and they will come

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113th Annual ASEE Conference and Exposition, 2006

作者： Barrett, Steven Hamann, Jerry Coon, Dennis Crips, Paul Pierre, John University of Wyoming United States Department of Electrical and Computer Engineering University of Wyoming United States IEEE Tau Beta Pi United States University of Wyoming Hewlett Foundation Engineering Schools of the West Initiative United States Engineering Summer Program Laramie Middle School United States United States Society of Student Astronomers Women in Science Forum U.S. Naval Academy and the American Meteorological Society United States ASEE Societies

Many universities and colleges are faced with declining numbers of potential engineering students. In Wyoming, this is due to a declining number of high school graduates as well as potential students not being aware of the engineering career field. We have met this challenge with a variety of awareness and recruiting program.. A common thread in these efforts is a hands-on laboratory program.in digital design fundamentals. This program.exposes students to the exciting world of engineering, Boolean logic, and fundamental design principles. This low cost program.consists of a series of theory modules coupled with a hands-on laboratory component. We have purposely developed laboratory modules using low cost, readily available components and test equipment. This approach has been used for the past five years with a middle school girls program. science and engineering summer program. for high school juniors and seniors, K-12 teacher enrichment program., and also freshmen orientation to electrical and computer engineering program.. In this paper we will describe the modular approach, the low cost laboratory exercises, and also the success of using this approach to attract students to careers in the engineering and science. © American Society for engineering Education, 2006.

关键词： engineering education

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Grading lab reports effectively: using rubrics developed collaboratively by ECE and technical writing instructors

Grading lab reports effectively: using rubrics developed col...

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113th Annual ASEE Conference and Exposition, 2006

作者： Powe, Alexis Moorhead, Jane Mississippi State University United States Mississippi State University Bagley College of Engineering Shackouls Technical Communication Program United States Box 9544 Mississippi State University Mississippi State MS 39762 United States Mississippi State University Electrical and Computer Engineering Department United States Box 9571 Mississippi State University Mississippi State MS 39762 United States

This paper describes a collaboration between a sophomore/junior-level lab component in an electrical and computer engineering (ECE) course and a junior-level technical writing course within the Mississippi State University Bagley College of engineering's Shackouls Technical Communication program.(TCP). Grading for labs with weekly writing assignments poses challenges previously overlooked by collaborations between ECE and the TCP. Since lengthy reports are required weekly for the Digital Devices and Logic Design (ECE 3714) lab component, grade turnaround must be quick and can become extremely burdensome for teaching assistants, many of whom struggle with writing themselves due to lack of confidence or ESL challenges. This collaboration differs from other ECE-TCP collaborations significantly in that it utilizes a lab-grading system that combines traditional, non-quantitative rubrics and set penalties for mechanical/stylistic errors to expedite the grading process while retaining grading reliability among TAs. Five specific areas have been defined within each rubric to make up the total percentage of the grade, with the point values changing to reflect the focus of each lab. Topics discussed include an overview of analytic versus holistic grading and the rationale behind the authors' grading approach, previous ECE-TCP collaborations, the combined rubric-set penalties grading system for ECE 3714 with sample grading materials provided, quantitative and qualitative assessments of the newly implemented grading approach, and potential pitfalls of the authors' grading approach. © American Society for engineering Education, 2006.

关键词： Technical writing

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Custom error control schemes for energy efficient bluetooth sensor networks

Custom error control schemes for energy efficient bluetooth ...

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International Symposium on Telecommunications

作者： Joao H. Kleinschmidt Walter C. Borelli Marcelo E. Pellenz Department of Telematics School of Electrical and Computer Engineering State University of Campinas Sao Paulo Brazil Graduate Program in Computer Science Pontifical Catholic University of Paraná Curitiba Parana Brazil

This paper analyzes the effect of custom error control schemes on the energy efficiency in Bluetooth sensor networks. The energy efficiency metric considers in just one parameter the energy and reliability constraints of the wireless sensor networks. New packet types are introduced using some error control strategies in the AUX1 packet, such as Hamming and BCH codes, with and without CRC for error detection. Two adaptive techniques are proposed that change the error control strategy based on the number of hops traversed by a packet through the network. The performance results are obtained through simulations in a channel with Rayleigh fading for networks with different number of hops, showing that error control can improve the energy efficiency of a Bluetooth-based sensor network.

关键词： Error correction Energy efficiency Bluetooth Wireless sensor networks Media Access Protocol Energy consumption Sensor phenomena and characterization Automatic repeat request Analytical models Cyclic redundancy check

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