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On localization with robust power control for safety critical wireless sensor networks

控制理论与应用（英文版） 2011年第1期9卷 83-92页

作者： Michael J. WALSH anthony fee John BARTON Brendan O'FLYNN Martin J. HAYES Cian O'MATHUNA Clarity Center for Web Technologies Microsystems Centre-Tyndall National Institute Lee MaltingsUniversity College CorkCorkIreland Wireless Access Research Center University of LimerickLimerickIreland

A hybrid methodology is proposed for use in low power, safety critical wireless sensor network applications, where quality-of-service orientated transceiver output power control is required to operate in parallel with radio frequency-based localization. The practical implementation is framed in an experimental procedure designed to track a moving agent in a realistic indoor environment. An adaptive time synchronized approach is employed to ensure the positioning technique can operate effectively in the presence of dataloss and where the transmitter output power of the mobile agent is varying due to power control. A deterministic multilateration-based positioning approach is adopted and accuracy is improved by filtering signal strength measurements overtime to account for multipath fading. The location estimate is arrived at by employing least-squares estimation. Power control is implemented at two separate levels in the network topology. First, power control is applied to the uplink between the tracking reference nodes and the centralized access point. A number of algorithms are implemented highlighting the advantage associated with using additional feedback bandwidth, where available, and also the need for effective time delay compensation. The second layer of power control is implemented on the uplink between the mobile agent and the access point and here quantifiable improvements in quality of service and energy efficiency are observed. The hybrid paradigm is extensively tested experimentally on a fully compliant 802.15.4 testbed, where mobility is considered in the problem formulation using a team of fully autonomous robots.

关键词： Wireless sensor network Power control Localization

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Synthesis and Purple-Blue Emission of Antimony Trioxide Single-Crystalline Nanobelts with Elliptical Cross Section

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Nano Research 2009年第2期2卷 151-160页

作者： Zhengtao Deng Dong Chen Fangqiong Tang Jun Ren anthony J.Muscat Laboratory of Controllable Preparation and Application of Nanomaterials Technical Institute of Physics and ChemistryChinese Academy of SciencesBeijing 100080China Department of Chemical and Environmental Engineering The University of ArizonaTucsonArizona 85721USA College of Optical Science The University of ArizonaTucsonArizona 85721USA

Single-crystalline orthorhombic antimony trioxide(Sb_(2)O_(3))nanobelts with unique elliptical cross sections and purple-blue photoluminescence have been *** uniform Sb2O3 nanobelts are 400600 nm in width,2040 nm in thickness at the center and gradually become thinner to form sharp edges sub-5 nm in size,tens of micrometers in length,and with[001]as the preferential growth ***-assembly of tens of nanobelts into three-dimensional(3-D)flower-like nanostructures has been *** was performed by X-ray diffraction,energy-dispersive X-ray spectroscopy,X-ray photoelectron spectroscopy,scanning electron microscopy,high-resolution transmission electron microscopy,selected area electron diffraction,Raman spectroscopy,Fourier transform infrared spectroscopy,and photoluminescence *** Sb_(2)O_(3) nanobelts display intense purple-blue photoluminescence centred at 425 nm(~2.92 eV).The successful synthesis of nanobelts with elliptical cross sections may cast new light on the investigation of the property differences between nanobelts with rectangular cross sections and those with other cross section *** Sb2O3 nanobelts can be used as effective purple-blue light emitters and may also be valuable for future nanodevice design.

关键词： Antimony trioxide nanobelts elliptical cross section purple-blue photoluminescence

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Development of tropoelastin-functionalized anisotropic PCL scaffolds for musculoskeletal tissue engineering

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Regenerative Biomaterials 2023年第1期10卷 64-72页

作者： Miao Zhang Ziyu Wang Anyu Zhang Linyang Liu Suzanne M.Mithieux Marcela M.M.Bilek anthony S.Weiss Charles Perkins Centre The University of SydneySydneyNSW 2006Australia School of Life and Environmental Sciences The University of SydneySydneyNSW 2006Australia Applied and Plasma Physics Laboratory School of PhysicsThe University of SydneySydneyNSW 2006Australia School of Biomedical Engineering The University of SydneySydneyNSW 2006Australia Sydney Nano Institute The University of SydneySydneyNSW 2006Australia

The highly organized extracellular matrix(ECM)of musculoskeletal tissues,encompassing tendons,ligaments and muscles,is structurally anisotropic,hierarchical and *** features collectively contribute to their unique *** studies have investigated the effect of tissue-engineered scaffold anisotropy on cell morphology and organization for musculoskeletal tissue repair and regeneration,but the hierarchical arrangement of ECM and compartmentalization are not typically ***,we present a method for multi-compartmental scaffold design that allows for physical mimicry of the spatial architecture of musculoskeletal tissue in regenerative *** design is based on an ECM-inspired macromolecule ***(PCL)scaffolds were fabricated with aligned fibers by electrospinning and mechanical stretching,and then surface-functionalized with the cell-supporting ECM protein molecule,tropoelastin(TE).TE was attached using two alternative methods that allowed for either physisorption or covalent attachment,where the latter was achieved by plasma ion immersion implantation(PIII).Aligned fibers stimulated cell elongation and improved cell alignment,in contrast to randomly oriented *** coatings bound by physisorption or covalently following 200 s PIII treatment promoted fibroblast *** represents the first cytocompatibility assessment of novel PIII-treated TE-coated PCL *** demonstrate their versatility,these 2D anisotropic PCL scaffolds were assembled into 3D hierarchical constructs with an internally compartmentalized structure to mimic the structure of musculoskeletal tissue.

关键词： tropoelastin PCL musculoskeletal tissue engineering plasma immersion ion implantation electrospinning anisotropy hierarchical

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