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International Conference on Intelligent Environments (IE)

作者： Salvador Jauregui-Ortiz Mario Siller Felix Ramos Edson Scalabrin Electrical Engineering and Computer Science Department Center of Research and Advanced Studies of the IPN Guadalajara Jalisco Mexico Graduate Program in Computer Science Pontifical Catholic University Parana Brazil Curitiba Parana Brazil

As far as we know, there is not a Node Localization Algorithm (NLA) that presents the same accuracy for all possible scenarios. We believe that a NLA should be able to "interpret" the dynamic information of the environment. In this sense, simple NLAs are rather focused and might perform well for specific scenarios and applications. Therefore, information fusion and context awareness seems to be an appropriate approach to address this issue. We propose the Smart Environmental Architecture for Node Localization (SEA-NL), which is composed by two main elements: (i) the Smart Beacon Nodes (SBNs) and (ii) the Logical Position of Nodes (LPN). In (i) the obstruction level indicator is estimated and can improve the estimation of distances among nodes. In (ii) environment information and a one to one relation between a node and an object are used and can also improve location estimation. Via simulation, our architecture was tested indoors and outdoors considering three localization algorithms: the Weighed Centroid Localization (WCL), the Centroid Localization, and the Triangular Centroid Localization. Finally, we present an accuracy comparison among NLAs used in isolated way, and by using the SBNs, the LPN, and the SEA-NL, where our architecture improves WCL up to ~30.88%.

关键词： Wireless sensor networks Accuracy Estimation computer architecture Buildings Attenuation Monitoring

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Applying MVC to Evolutionary Acquisition IRPM

Applying MVC to Evolutionary Acquisition IRPM

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2012 International Conference on Smart Grid Systems(ICSGS 2012)

作者： Patrick Letouze Mariwaldo G. Caetano Joāo Y. Ishihara David Prata George Brito UFT-Federal University of Tocantins Brazil:Department of Computer Science UnB-University of Brasilia Brazil:Department of Electrical EngineeringPGEA-Program of Post-Graduation in Electronic and Automation Systems Engineering

This work presents a combination of the Model-View-Controller pattern with the Evolutionary Acquisition Interdisciplinary Research Project Management for web services *** intends to promote an increase in productivity and to facilitate interdisciplinary web services *** consists of an independent database for users' feedback that together with technological opportunities and evolving threats considerations may start a new release of the system allowing a dynamic evolution through acquiring new features or correcting errors,but the new release decision is not *** other words,web service evolution is accomplished adding requirements analysis into the Model-View-Controller pattern,which is incorporated into Interdisciplinary Research Project Management.

关键词： Evolutionary acquisition,IRPM,MVC,project management,software engineering,web services.

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All dielectric zero-index metamaterials at optical frequencies

All dielectric zero-index metamaterials at optical frequenci...

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Conference on Optoelectronic and Microelectronic Materials and Devices

作者： J. Valentine P. Moitra Y. Yang W. Wang Department of Mechanical Engineering Vanderbilt University Nashville TN USA Interdisciplinary Program in Materials Science Vanderbilt University Nashville TN USA Department of Electrical Engineering and Computer Science Vanderbilt University Nashville TN USA

Dielectric metamaterials offer a potential low-loss alternative to plasmonic metamaterials at optical frequencies. However, demonstrations of dielectric metamaterials have so far been limited to microwave and mid-infrared frequencies. In this work, we outline the development of purely dielectric zero-index metamaterials operating at optical frequencies. The metamaterial, formed from silicon rods, exhibits impedance matching with air, resulting in unity transmission at the zero-index point. Design and experimental realization of the metamaterials is presented. The metamaterials can potentially be used for a number of applications including compact lens systems, directional emitters, and transformation optics devices.

关键词： Metamaterials Magnetic materials Silicon Optical device fabrication Dielectrics Optical refraction

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Feasibility of enhancing the thermoelectric power factor in GaNxAs1−x

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Physical Review B 2012年第8期86卷 085314-085314页

作者： P. Pichanusakorn Y. J. Kuang C. Patel C. W. Tu P. R. Bandaru Materials Science Program Department of Mechanical and Aerospace Engineering University of California San Diego La Jolla California 92093 USA Department of Electrical and Computer Engineering University of California San Diego La Jolla California 92093 USA

This study was motivated by the possibility of using N resonant levels interacting with the GaAs conduction band, in GaNxAs1−x (0<x<2.5%), to enhance the density of states effective mass (md) and consequently th... 详细信息

This study was motivated by the possibility of using N resonant levels interacting with the GaAs conduction band, in GaNxAs1−x (0electrical conductivity. However, it was observed that, compared with GaAs, the power factor was reduced in spite of a small increase in the md. The influences of carrier passivation and dopant type, as well as the changes in the carrier scattering mechanism, which degrades the carrier mobility, are discussed.

关键词： THERMOELECTRIC power GALLIUM nitride CONDUCTION band DENSITY of states SEEBECK coefficient

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A NEW NONRIGID REGISTRATION APPROACH FOR MOTION CORRECTION OF CARDIAC FIRST-PASS PERFUSION MRI

A NEW NONRIGID REGISTRATION APPROACH FOR MOTION CORRECTION O...

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IEEE International Conference on Image Processing

作者： F. Khalifa G. M. Beache A. Firjani K. C. Welch G. Gimel'farb A. El-Baz Bioengineering Department University of Louisville Louisville KY USA Radiology Department School of Medicine University of Louisville Louisville KY USA Radiology Department University of Louisville Louisville KY USA Department of Computer Engineering and Computer Science University of Louisville Louisville KY USA Electrical and Computer Engineering Department University of Louisville Louisville KY USA Department of Computer Science University of Auckland Auckland New Zealand

Accurate registration of cardiac first-pass magnetic resonance imaging (FP-MRI) is fundamental for precise analysis of myocardial perfusion. In this paper, we introduce and validate a new framework for accurate registration of the segmented left ventricle (LV) wall on cardiac FP-MRI. Due to the continuous physiological motion of the heart that causes the LV wall to change shape significantly and to move within and through the image plane, we developed a new methodology for 2D FP-MRI nonrigid registration that includes: (i) global target-to-reference frame-to-frame alignment based on the maximization of the normalized mutual information (NMI);(ii) local alignment based on using a B-splines transformation model that maximizes a similarity function that accounts for 1st- and 2ndorder NMI between the globally aligned frames followed by (iii) a refinement step that is based on deforming each pixel of the target wall over evolving closed equi-spaced contours (iso-contours) to closely match the reference wall. Respective iso-contours in both reference and target frames are matched based on solving the Laplace equation. We have tested our framework on both synthetic phantoms and 20 in-vivo data sets that have been collected from patients with ischemic damage from heart attacks, who are undergoing a novel myoregeneration therapy.

关键词： ISO standards Abstracts Manuals Facsimile Image resolution

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Characterization and quantification of gait deficits within gait phases using fuzzy-granular computing

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Journal of Biomedical science and engineering 2012年第12期5卷 720-728页

作者： Melaku A. Bogale Huiying Yu Thompson Sarkodie-Gyan Amr Abdelgawad Texas Tech University Health Science Center El Paso USA University of Texas at El Paso Computational Science Program El Paso USA University of Texas at El Paso Department of Electrical and Computer Engineering El Paso USA

People with neurological disorders like Cerebral Palsy (CP) and Multiple Sclerosis (MS) suffer associated functional gait problems. The symptoms and sign of these gait deficits are different between subjects and even within a subject at different stage of the disease. Identifying these gait related abnormalities helps in the treatment planning and rehabilitation process. The current gait assessment process does not provide very specific information within the seven gait phases. The objective of this study is to investigate the possible application of granular computing to quantify gait parameters within the seven gait phases. In this process we applied fuzzy-granular computing on the vertical ground reaction force (VGRF) and surface electromyography (sEMG) data to obtain respective characteristic values for each gait phase. A fuzzy similarity (FS) measure is used to compare patient values with age and sex matched control able-bodied group. We specifically applied and tested this approach on 10 patients (4 Cerebral Palsy and 6 Multiple Sclerosis) to identify possible gait abnormalities. Different FS values for VGRF for right and left leg is observed. The VGRF analysis shows smaller FS values during the swing phase in CP and MS subjects that are evidence of associated stability problem. Similarly, FS values for muscle activates of the four-selected muscle display a broad range of values due to difference between subjects. Degraded FS values for different muscles at different stage of the gait cycle are reported. Smaller FS values are sign of abnormal activity of the respective muscles. This approach provides individual centered and very specific information within the gait phases that can be employed for diagnosis, treatment and rehabilitation process.

关键词： Fuzzy-Granular Algorithm Gait Phases Fuzzy Similarity Cerebral Palsy Multiple Sclerosis

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Optimizing the design of FT-IR spectroscopic imaging instruments to obtain increased spatial resolution of chemical species

Optimizing the design of FT-IR spectroscopic imaging instrum...

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IEEE International Symposium on Biomedical Imaging

作者： R. Reddy D. Mayerich M. Walsh M. Schulmerich P. S. Carney R. Bhargava Department of Bioengineering University of Illinois Urbana-Champaign USA Beckman Institute for Advanced Science and Technology UIUC USA Beckman Institute for Advanced Science and Technology Department of Electrical and Computer Engineering UIUC USA Cancer Center University of Illinois USA

Fourier transform infrared (FT-IR) spectroscopic imaging provides spatially resolved chemical information. Recent developments have shown that this chemical information can be used to determine tissue cell types. Our goal is then to use the spatial distribution of tissue cell types to perform accurate diagnosis of cancer. However, this step is limited by the spatial resolution provided by current imaging systems. In this paper, we demonstrate that these instruments can be designed to provide better spatial resolution for tissue chemistry. We present an optical model for the propagation of light through an FT-IR spectroscopic imaging system. Using this model, we minimally modify an existing FT-IR spectroscopic imaging system to obtain significantly higher resolution and image quality. We demonstrate that it is possible to identify previously obscured tissue types by performing histological classification based on bio-chemically derived spectral features (metrics).

关键词： Imaging Chemicals Instruments Spatial resolution Cancer Detectors

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Device Interoperability and Authentication for Telemedical Appliance based on the ISO/IEEE 11073 Personal Health Device (PHD) Standards

Device Interoperability and Authentication for Telemedical A...

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

作者： Luther Paul R. Caranguian Susan Pancho-Festin Luis G. Sison a graduate student in the MS Electrical Engineering (Instrumentation and Control) program of University of the Philippines Diliman. Festin is with the Department of Computer Science University of the Philippines Diliman. with the Electrical and Electronics Engineering Institute University of the Philippines Diliman.

ISBN: (纸本)9781424441198

In this study, we focused on the interoperability and authentication of medical devices in the context of telemedical systems. A recent standard called the ISO/IEEE 11073 Personal Health Device (X73-PHD) Standards addresses the device interoperability problem by defining common protocols for agent (medical device) and manager (appliance) interface. The X73-PHD standard however has not addressed security and authentication of medical devices which is important in establishing integrity of a telemedical system. We have designed and implemented a security policy within the X73-PHD standards. The policy will enable device authentication using Asymmetric-Key Cryptography and the RSA algorithm as the digital signature scheme. We used two approaches for performing the digital signatures: direct software implementation and use of embedded security modules (ESM). The two approaches were evaluated and compared in terms of execution time and memory requirement. For the standard 2048-bit RSA, ESM calculates digital signatures only 12% of the total time for the direct implementation. Moreover, analysis shows that ESM offers more security advantage such as secure storage of keys compared to using direct implementation. Interoperability with other systems was verified by testing the system with LNI Healthlink, a manager software that implements the X73-PHD standard. Lastly, security analysis was done and the system's response to common attacks on authentication systems was analyzed and several measures were implemented to protect the system against them.

关键词： Interoperability Telemedical Authentication

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Joint scheduling for dual-hop block-fading broadcast channels

Joint scheduling for dual-hop block-fading broadcast channel...

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IEEE Globecom Workshops

作者： Ammar Zafar Mohammad Shaqfeh Mohamed-Slim Alouini Hussein Alnuweiri EE Program King Abdullah University for Science and Technology Thuwal Makkah Saudi Arabia Department of Electrical and Computer Engineering Texas A and M University Qatar Doha Qatar

In this paper, we propose joint user-and-hop scheduling over dual-hop block-fading broadcast channels in order to exploit multi-user diversity gains and multi-hop diversity gains all together. To achieve this objective, the first and second hops are scheduled opportunistically based on the channel state information and as a prerequisite we assume that the relay, which is half-duplex and operates using decode-and-forward, is capable of storing the received packets from the source until the channel condition of the destined user becomes good to be scheduled. We formulate the joint scheduling problem as maximizing the weighted sum of the long term achievable rates by the users under a stability constraint, which means that on the long term the rate received by the relay should equal the rate transmitted by it, in addition to constant or variable power constraints. We show that this problem is equivalent to a single-hop broadcast channel by treating the source as a virtual user with an optimal priority weight that maintains the stability constraint. We show how to obtain the source weight either off-line based on channel statistics or on real-time based on channel measurements. Furthermore, we consider special cases including the maximum sum rate scheduler and the proportional fair scheduler. We demonstrate via numerical results that our proposed joint scheduling scheme enlarges the rate region as compared with a scheme that employs multi-user scheduling alone.

关键词： Relays Joints Resource management Throughput Real-time systems Magnetohydrodynamics Multiuser detection

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Hydrogels: In Situ Self‐Folding Assembly of a Multi‐Walled Hydrogel Tube for Uniaxial Sustained Molecular Release (Adv. Mater. 39/2013)

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Advanced Materials 2013年第39期25卷

作者： Kwanghyun Baek Jae Hyun Jeong Artem Shkumatov Rashid Bashir Hyunjoon Kong Department of Materials Science and Engineering University of Illinois at Urbana‐Champaign Urbana Illinois 61801 USA Department of Chemical and Biomolecular Engineering University of Illinois at Urbana‐Champaign Urbana Illinois 61801 USA Department of Pathobiology University of Illinois at Urbana‐Champaign Urbana Illinois 61801 USA Department of Electrical and Computer Engineering Department of Bioengineering Micro and Nano Technology Lab Institute of Genomic Biology University of Illinois at Urbana‐Champaign Urbana Illinois 61801 USA Department of Chemical and Biomolecular Engineering Micro and Nanotechnology Laboratory Institute of Genomic Biology University of Illinois at Urbana‐Champaign Urbana Illinois 61801 USA

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