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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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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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N-Sequence RSNS Redundancy Analysis

N-Sequence RSNS Redundancy Analysis

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IEEE International Symposium on Information Theory

作者： Brian L. Luke Phillip. E. Pace Program Development Team Navy Information Operations Command Suitland Fort Meade MD USA Department of Electrical and Computer Engineering Naval Postgraduate School Monterrey CA USA

ISBN: (纸本)142440505X

Without dispute, symmetrical folding waveforms are the most common type of waveform in engineering science (e.g., cosine, sine). symmetrical number systems (SNS) have been formed to extract the maximum amount of information from symmetrically folded waveforms. The robust symmetrical number system (RSNS) is formed using N ges 2 sequences and ensures that two successive RSNS vectors differ by only one digit. This Gray-code property reduces the possibility of encoding errors and makes the RSNS useful in applications such as folding analog-to-digital converters, direction finding antenna architectures and photonic processors. This paper determines the length of combined sequences that contain no ambiguities (Mcirc) which we call the RSNS dynamic range. The position of M is also derived. We first extend our two-sequence results to develop Mcirc for a three-sequence RSNS with moduli of the form 2 r - 1, 2 r , 2 r + 1. We then extend the results to solving the N-channel RSNS redundancy locations in general

关键词： Dynamic range Redundancy Information analysis Military computing Data mining Robustness Encoding Analog-digital conversion Directive antennas Reflective binary codes

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Diamond Ultramicroelectrode Chemical Sensing Arrays

Diamond Ultramicroelectrode Chemical Sensing Arrays

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IEEE SENSORS

作者： W.P. Kang J.L. Davidson K.L. Soh Y.M. Wong D.E. Cliffel A.B. Bonds Department of Electrical and Computer Engineering Vanderbilt University Nashville TN USA Interdisciplinary Program in Materials Science Vanderbilt University Nashville TN USA Department of Chemistry Vanderbilt University Nashville TN USA

Diamond ultramicroelectrode arrays (D-UMEAs) have been fabricated and evaluated experimentally for chemical sensing. D-UMEAs were found to demonstrate higher current density per unit active area than planar diamond macroelectrode and glassy carbon electrode. D-UMEAs could address new operating envelopes in electrochemical detection, and provide stable sensor electrodes for bio and extreme environments.

关键词： Sensor arrays USA Councils Fabrication Microelectrodes Chemical sensors Envelope detectors Chemical and biological sensors Biosensors Biomedical electrodes Powders

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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 programs. 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 programs for high school juniors and seniors, K-12 teacher enrichment programs, and also freshmen orientation to electrical and computer engineering programs. 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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A biomimetic MEMS neurotransmitter detector

A biomimetic MEMS neurotransmitter detector

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10th International Conference on Miniaturized Systems for Chemistry and Life Sciences, MicroTAS 2006

作者： Koev, Stephan T. Wu, Li-Qun Payne, Gregory F. Ghodssi, Reza Department of Electrical and Computer Engineering University of Maryland College Park MD 20742 United States Institute for Systems Research University of Maryland College Park MD 20742 United States University of Maryland Biotechnology Institute University of Maryland College Park MD 20742 United States Bioengineering Graduate Program University of Maryland College Park MD 20742 United States

We demonstrate, for the first time, micromechanical detection of the neurotransmitter dopamine and its discrimination from ascorbic acid. Microcantilever sensors were fabricated and coated with the polysaccharide chitosan by electrodeposition. The cantilevers were used for electrochemical oxidation of dopamine solution. The products of this reaction crosslink the chitosan film and create a tensile stress, bending the cantilever out of plane considerably. By contrast, electrochemical oxidation of ascorbic acid solution does not cause chitosan crosslinking and appreciable cantilever bending. This method is an improvement over conventional electrochemical dopamine detection techniques (e.g. cyclic voltammetry) that are highly non-specific. © 2006 Society for Chemistry and Micro-Nano Systems.

关键词： Chitosan

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Design and evaluation of innoworks: A portable, interdisciplinary science and engineering program by volunteer college students for middle school youth from underprivileged backgrounds

Design and evaluation of innoworks: A portable, interdiscipl...

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113th Annual ASEE Conference and Exposition, 2006

作者： Hwang, William Bissell, Ahrash Kaplan, Daniel Mian, Matthew Agrawal, Vineet Manson, Jessica Ybarra, Gary United InnoWorks Academy Duke University United States Duke Univ. Majoring in Biomed. Eng. Elec. and Comp. Eng. and Phys. and Minoring in Chem. United States Duke University United States Duke University Chicago United States Funding and Sponsorships InnoWorks Duke University's Pratt School of Engineering United States InnoWorks Program Department of Electrical and Computer Engineering Duke University's Prattt School of Engineering United States

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Multiday Electrophysiological Recordings from Freely Behaving Primates

Multiday Electrophysiological Recordings from Freely Behavin...

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Annual International Conference of the IEEE engineering in Medicine and Biology Society (EMBC)

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

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

关键词： Accelerometers Batteries Magnetic heads USA Councils Cities and towns Electrophysiology computer science Neurosurgery Data analysis Testing

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An Algorithm for Unit Tight Frames with Constant Chip Magnitude Design in Overloaded CDMA Systems

An Algorithm for Unit Tight Frames with Constant Chip Magnit...

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Annual Conference on Information Sciences and Systems (CISS)

作者： Paul Cotae Matt Aguirre Mehdi Shadaram Department of Electrical and Computer Engineering University of Technology San Antonio TX USA Crypto Modernization Program Office Matthew.Aguirre@LACKLAND.AF.MIL University of Texas San Antonio USA

We developed an algorithm which allows obtaining a Gram matrix having a particular pattern for crosscorrelations of the signature sequences. When it is used for real numbers, unit tight frame signature sets are obtained, as they are required by 2G or 3G CDMA systems. When this algorithm is used for complex numbers, complex valued signature sets with constant chip magnitude are obtained. The results are derived in the context of synchronous CDMA systems and numerical results are provided to illustrate the mathematical formalism.

关键词： Algorithm design and analysis Multiaccess communication Code division multiplexing Semiconductor device measurement Multiple access interference Spread spectrum communication Communication system traffic Wireless communication Power system modeling Signal design

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electrical Transport in Transparent Conducting Tin‐doped Indium Oxide Films

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AIP Conference Proceedings 2006年第1期850卷 1548-1549页

作者： S. S. Yeh J. Y. Lu M. W. Shiu J. J. Lin Institute of Physics National Chiao Tung University Hsinchu 30010 Taiwan Electrical Engineering and Computer Science Undergraduate Honor Program National Chiao Tung University Hsinchu 30010 Taiwan Department of Electrophysics National Chiao Tung University Hsinchu 30010 Taiwan

We have studied the temperature behavior of the electrical resistivities ρ(T) in a series of tin‐doped indium‐oxide films with different residual resistivities ρ0 varying from 218 to 568 μΩ cm. We found that the temperature dependence of ρ can be well described by the Bloch‐Grüneisen law from 300 K down to about 100 K. In particular, we observed that the strength of the electron‐phonon coupling, βBG (which characterizes a prefactor in the Bloch‐Grüneisen formula) increases linearly with increasing ρ0. This result is not understood in terms of current theoretical concept for electron‐phonon interaction in metals.

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