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Symposium on Ferroelectricity and Piezoelectricity: Materials, Devices, and Applications

作者： Kalkur, T.S. Sbrockey, N.M. Tompa, G.S. Alpay, S.P. Department of Electrical and Computer Engineering University of Colorado at Colorado Springs Colorado Springs CO 80933-7150 United States Structured Materials Industries Inc. Unit 102 201 Circle Drive North Piscataway NJ 08854 United States Materials Science and Engineering Program Department of Chemical Materials and Biomolecular Engineering University of Connecticut Storrs CT 06269 United States

Tunable Ka band filters based on graded barium strontium titanate (BST) have been investigated in terms of their associated parasitics, tunability, and temperature dependence of capacitance. The simulation results show that increase in parasitic resistance from 0.05 ohm to 1 ohm increases the insertion loss from 0 db to 25 db. The simulation results also show that, with 60% tunability for graded BST capacitors, the center frequency of the filter can be tuned from 29.489 GHz to 45.144 GHz. In addition, the bandwidth shift becomes temperature independent when the graded BST capacitor is biased at an electric field of 3e7V/cm. Copyright © Taylor & Francis Group, LLC.

关键词： Barium strontium titanate

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A “Living” Microvascular Stamp: “Living” Microvascular Stamp for Patterning of Functional Neovessels;Orchestrated Control of Matrix Property and Geometry (Adv. Mater. 1/2012)

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Advanced Materials 2011年第1期24卷

作者： Jae Hyun Jeong Vincent Chan Chaenyung Cha Pinar Zorlutuna Casey Dyck K. Jimmy Hsia Rashid Bashir Hyunjoon Kong Department of Chemical and Biomolecular Engineering University of Illinois at Urbana‐Champaign Urbana Illinois 61801 USA Department of Bioengineering University of Illinois at Urbana‐Champaign Urbana Illinois 61801 USA Department of Mechanical Science and Engineering University of Illinois at Urbana‐Champaign Urbana Illinois 61801 USA Micro and Nanotechnology Laboratory University of Illinois at Urbana‐Champaign Urbana Illinois 61801 USA Department of Electrical and Computer Engineering University of Illinois at Urbana‐Champaign Urbana Illinois 61801 USA Institute of Genomic Biology University of Illinois at Urbana‐Champaign Urbana Illinois 61801 USA

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The keyword-based and semantic-driven data matching approach for assisting structuralizing the textual clinical documents

The keyword-based and semantic-driven data matching approach...

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International Conference on Biomedical engineering and Informatics

作者： Chen, Chi-Huang Ping, Xiao-Ou Wang, Zi-Jun Hsieh, Sheau-Ling Chen, Li-Chin Tseng, Yi-Ju Hsu, Ching-Wei Lai, Feipei Department of Electrical Engineering National Taiwan University Taipei Taiwan Graduate Institute of Computer Science and Information Engineering National Taiwan University Taipei Taiwan Graduate Institute of Biomedical Electronic and Bioinformatics National Taiwan University Taipei Taiwan EECS International Graduate Program Institute/IT Center National Chiao Tung University Hsinchu Taiwan

ISBN: (纸本)9781424464968

The clinical data stored in the health information system can be categorized as two types including structuralized data and non-structuralized ones. In the paper, a data extraction system is developed to assist data retrieval from the non-structuralized textual clinical documents such as radiology reports, pathology reports, etc. The system provides keyword-based and semantic-driven data matching methodology to extract the specific information from the textual clinical documents. The matching methodology provides the capabilities to recognize the selected keywords and the related semantics in the documents. Through the extraction verification interface, clinicians can extract and verify the matched information semi-automatically. The extracted data can be filled into predefined case-oriented templates. The structuralized data can be stored back into the clinical data warehouse for further analyzing. Moreover, the case-oriented templates can support collecting corresponding extracted data for various researches. ©2010 IEEE.

关键词： Semantics

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PDMS stretchable platforms for the studies of mechanical compression on neurogenesis

PDMS stretchable platforms for the studies of mechanical com...

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IEEE International Conference on Nano/Molecular Medicine and engineering (NANOMED)

作者： Leyla Esfandiari William C Tang Biomedical Engineering Interdepartmental Program University of California Los Angeles CA USA Department of Electrical Engineering and Computer Science University of California Irvine CA USA

The use of MEMS to study the effect of mechanical compression on neurogenesis has been demonstrated. Polydimethylsiloxane-(PDMS)-based stretchable platforms were used on neurosphere assay to investigate the role of mechanical forces on the formation of radial glial processes, neuronal generation and migration. To induce mechanical compression on neurospheres, The PDMS culturing substrate is patterned with micron-sized wells. Neurospheres are cultured on the prestretched device. After 48 hours, when neurospheres are grown to the size of the well's width, the stretched substrate is released. The experimental results showed that applied mechanical compression on neural stem cells cultured as neurospheres could be a factor accelerating the radial glial formation, which is associated to neurogenesis and neuronal migration.

关键词： Neurons Image coding Stem cells Substrates Embryo Fluorescence Biomembranes

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Modeling backscatter of marine mammal biomimetic sonar signals from bubble clouds

Modeling backscatter of marine mammal biomimetic sonar signa...

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OCEANS - Europe

作者： K. P. Yeo Elizabeth Taylor S. H. Ong Marine Mammal Research Laboratory Tropical Marine Science Institute National University of Singapore Singapore Department of Electrical and Computer Engineering Division of Bioengineering National University of Singapore Singapore

Bubbles are powerful and complex sound scatterers in water because of the impedance mismatch at each water-air/gas interface. Bubbles are formed by natural processes that include rainfall, gas emission from the sea bed, boat wakes, living or decomposing organisms, and wave breaking- the latter being the dominant cause of bubble entrainment in the surf zone. Despite the complications of sound propagation in bubble-populated water, some species of cetaceans have been observed to hunt efficiently in shallow coastal waters and in biologically active rivers where bubbles persist. In contrast, the performance of man-made sonar systems has always been greatly handicapped by this phenomenon and improvement is necessary. How cetaceans manage to overcome the problem of echolocating through bubbles clouds is still largely unknown. However, if we can gain a more complete understanding of the ways in which bubbles respond to echolocation signals transmitted by cetaceans, this might provide insight into the strategies they use for detecting prey under such conditions, or, indeed, how they manipulate the 'bubble screen' effect to catch fish. New insights could then contribute to the development of improved, bio-mimetic sonar systems for use in difficult environments such as the littoral zone. This paper presents a model describing the backscatter of marine mammal bio-mimetic sonar signals from bubble clouds. Echolocation signals from a dolphin and a porpoise were modeled, and we simulated the backscatter response of single bubbles from a discretized bubble population distribution when driven by each type of echolocation click. Responses from individual bubbles with various radii were then used to find the total bubble cloud backscatter response. This paper explores the backscatter from bubble clouds using two types of bio-mimetic echolocation pulses that have different signal characteristics.

关键词： Clouds Backscatter Dolphins Chirp Equations Resonant frequency Mathematical model

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Growth and characteristics of GaInN/GaInN multiple quantum well light-emitting diodes

Growth and characteristics of GaInN/GaInN multiple quantum w...

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作者： Lee, Wonseok Kim, Min-Ho Zhu, Di Noemaun, Ahmed N. Kim, Jong Kyu Schubert, E.F. Future Chips Constellation and Engineering Science Program Rensselaer Polytechnic Institute Troy NY 12180 United States Samsung LED Suwon 443-743 Korea Republic of Future Chips Constellation Department of Physics Applied Physics and Astronomy Rensselaer Polytechnic Institute Troy NY 12180 United States Future Chips Constellation Department of Electrical Computer and Systems Engineering Rensselaer Polytechnic Institute Troy NY 12180 United States Department of Materials Science and Engineering Pohang University of Science and Technology Pohang 790-784 Korea Republic of

We demonstrate GaInN multiple quantum well (MQW) light-emitting diodes (LEDs) having ternary GaInN quantum barriers (QBs) instead of conventional binary GaN QBs for a reduced polarization mismatch between QWs and QBs and an additional separate confinement of carriers to the MQW active region. In comparison with GaInN LEDs with conventional GaN QBs, the GaInN/GaInN LEDs show a reduced blueshift of the peak wavelength with increasing injection current and a reduced forward voltage. In addition, we investigate the density of pits emerging on top of the MQW layer that are correlated with V-defects and act as a path for the reverse leakage current. The GaInN/GaInN MQW structure has a lower pit density than the GaInN/GaN MQW structure as well as a lower reverse leakage current. Finally, the GaInN/GaInN MQW LEDs show higher light output power and external quantum efficiency at high injection currents compared to the conventional GaInN/GaN MQW LEDs. We attribute these results to the reduced polarization mismatch and the reduced lattice mismatch in the GaInN/GaInN MQW active region. © 2010 American Institute of Physics.

关键词： III-V semiconductors

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Photonic crystal defects with increased surface area for improved refractive index sensing

Photonic crystal defects with increased surface area for imp...

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Conference on Lasers and Electro-Optics

作者： Kang, Christopher Phare, Christopher Weiss, Sharon M. Vlasov, Yurii A. Assefa, Solomon Interdisciplinary Graduate Program in Materials Science Vanderbilt University Nashville TN 37235 United States Department of Physics and Astronomy Vanderbilt University Nashville TN 37235 United States Department of Electrical Engineering and Computer Science Vanderbilt University 37235 United States IBM. T.J. Watson Research Center Yorktown Heights NY 10536 United States

Photonic crystal cavities with tunable surface area via multiple-hole defects were investigated for increased resonance wavelength shins upon exposure to variable-index analytes. Sensitivity was improved by 10% compar... 详细信息

ISBN: (纸本)9781557528902

关键词： Surface defects

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Photonic crystal defects with increased surface area for improved refractive index sensing

Photonic crystal defects with increased surface area for imp...

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Conference on Lasers and Electro-Optics, CLEO 2010

作者： Kang, Christopher Christopher Phare Weiss, Sharon M. Vlasov, Yurii A. Assefa, Solomon Interdisciplinary Graduate Program in Materials Science Vanderbilt University Nashville TN 37235 United States Department of Physics and Astronomy Vanderbilt University Nashville TN 37235 United States Department of Electrical Engineering and Computer Science Vanderbilt University Tennessee 37235 United States IBM T.J. Watson Research Center Yorktown Heights NY 10536 United States

Photonic crystal cavities with tunable surface area via multiple-hole defects were investigated for increased resonance wavelength shifts upon exposure to variable-index analytes. Sensitivity was improved by 10% compa... 详细信息

ISBN: (纸本)9781557528896

关键词： Refractive index

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CALE: A Context-Aware Living Environment Based on Zigbee Sensor Network

CALE: A Context-Aware Living Environment Based on Zigbee Sen...

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International Conference on Mobile Ad-hoc and Sensor Networks, MSN

作者： Kun-Ming Yu Jian-Yuan Liou Bo-Han Yeh Chang Wu Yu Ching-Cheng Tien Chih-Hu Wang Ping-Yu Wang Department of Computer Science and Information Engineering Chung Hua University Taiwan Program of Technology Management Chung Hua University Taiwan Department of Electrical Engineering Chung Hua University Taiwan

The paper employed some independently developed sensors based on the Octopus X platform to build a Zigbee-based Sensor Networks. Also, we implemented a Location-aware living environment by deploying the developed Zigee-based sensor. Besides, through the created window console interface, the sensed data can be transmitted and transformed to the database for further utilized. Moreover, by the devised Web interface, the update request data can be observed efficiently and responded effectively to any situations.

关键词： Zigbee Wireless sensor networks Software Hardware Wireless communication Databases Temperature sensors

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Adaptive predictive control of a class of discrete-time MIMO nonlinear systems with uncertain couplings

Adaptive predictive control of a class of discrete-time MIMO...

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作者： Yang, Chenguang Li, Yanan Ge, Shuzhi Sam Lee, Tong Heng Department of Bioengineering Imperial College London London SW7 2AZ United Kingdom Social Robotics Lab Interactive Digital Media Institute and Department of Electrical and Computer Engineering National University of Singapore Singapore 117576 Singapore Institute of Intelligent Systems University of Electronic Science and Technology of China Chengdu 610054 China

ISBN: (纸本)9781424474264

In this paper, a novel adaptive predictive control is presented for a class of multi-input-multi-output (MIMO) nonlinear systems in block-triangular form with uncertain couplings of states/delayed states as well as inputs among subsystems. For each subsystem of the MIMO system, future states prediction is developed and using the predicted future states, adaptive predictive control is designed under certainty equivalence principal to compensate the parametric uncertainties in the couplings. To eliminate the functional uncertainties in the couplings, a novel compensation mechanism is developed for each subsystem. Under the proposed adaptive controls, all the signals in the closed-loop MIMO systems are guaranteed to be globally bounded. In addition, all the output tracking errors are guaranteed to converge to zeros. The effectiveness of the proposed control is demonstrated in the simulation. © 2010 AACC.

关键词： Couplings

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