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Research Interests:
Indoor localization based on unsynchronized, low-complexity, passive radio frequency identification (RFID) using the received signal strength indicator (RSSI) has a wide potential for a variety of internet of things (IoTs) applications... more
Indoor localization based on unsynchronized, low-complexity, passive radio frequency identification (RFID) using the received signal strength indicator (RSSI) has a wide potential for a variety of internet of things (IoTs) applications due to their energy-harvesting capabilities and low complexity. However, conventional RSSI-based algorithms present inaccurate ranging, especially in indoor environments, mainly because of the multipath randomness effect. In this work, we propose RSSI-based localization with low-complexity, passive RFID infrastructure utilizing the potential benefits of large-scale MIMO technology operated in the millimeter-wave band, which offers channel hardening, in order to alleviate the effect of small-scale fading. Particularly, by investigating an indoor environment equipped with extremely simple dielectric resonator (DR) tags, we propose an efficient localization algorithm that enables a smart object equipped with large-scale MIMO exploiting the RSSI measureme...
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In a novel mm-wave localization system, dielectric resonators (DR) have been proposed as passive chipless RFID tags to mark fixed reference nodes. To counter clutter and improve the limited read range due to the low RCS level of a DR at... more
In a novel mm-wave localization system, dielectric resonators (DR) have been proposed as passive chipless RFID tags to mark fixed reference nodes. To counter clutter and improve the limited read range due to the low RCS level of a DR at millimeter-wave frequencies we propose a combination of several DRs with a dielectric spherical lens which allows improvement of up to 30 dB. The paper presents the design principle and shows simulation results and experimental verification of a scaled tag operating in the 10–12 GHz range and covering a range of incidence angle of the reader signal of ± 50°. A frequency sweeping RF reader can identify the tag (information) by the peak of the RCS level at its DR resonant frequency. For a multiple-tag scenario we can realize up to 12 different tags which can be discriminated unambiguously by their resonant frequencies in a 1: 1.2 frequency bandwidth.
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The RCS of flat cylindrical Dielectric Resonators (DR) is investigated and found to be too low for an application of the resonators as tags in a novel indoor localization system at mm-wave frequencies. As a method to increase the RCS of a... more
The RCS of flat cylindrical Dielectric Resonators (DR) is investigated and found to be too low for an application of the resonators as tags in a novel indoor localization system at mm-wave frequencies. As a method to increase the RCS of a DR tag, we propose the combination with a constant-index spherical lens. The collimation and scattering properties of this lens type are found suitable for a combination with DRs. The optimum relative permittivity of the lens is found in the range of ϵr=1.6 to 2.8 and the optimum distance between lens surface and DR is found slightly larger than the radius of the DR. RCS enhancement is found to vary with the modes of the DR but increases approximately with the fourth power of the lens radius. However, RCS signatures become corrupted by scattering due to mismatch effects of large lenses such that the lens diameter has to be limited to 4 to 5 wavelengths with the RCS enhancement limited to about 30 to 35 dB. Simulation and experimental verification a...
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Hybrid modelling is an important emerging field for chemical engineers and engineers in general. There are many engineering problems that require two or more unique and powerful software packages for a solution to be generated. Each... more
Hybrid modelling is an important emerging field for chemical engineers and engineers in general. There are many engineering problems that require two or more unique and powerful software packages for a solution to be generated. Each program offers unique advantages and specialties, but there is to date no single program that incorporates all of the data and methods, which could
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We aimed to examine the outcomes of robot transaxillary thyroidectomy when compared with conventional thyroidectomy in a patient population that lacked the desire for a cervical incision. A retrospective review of a prospectively... more
We aimed to examine the outcomes of robot transaxillary thyroidectomy when compared with conventional thyroidectomy in a patient population that lacked the desire for a cervical incision. A retrospective review of a prospectively collected database identified all patients who underwent robotic transaxillary hemithyroidectomy between April 2010 and February 2013. The outcomes of these patients were compared with a matched sample of consecutive patients who underwent conventional hemithyroidectomy during the same period. All values are expressed as mean ± standard error of mean. During the study period, 110 patients underwent robotic transaxillary hemithyroidectomy and were compared to a matched group of 110 patients who underwent conventional hemithyroidectomy. Both groups were similar in regard to body mass index (P = .16) and volume of thyroid lobe resected (P = .71). Patients offered the robotic approach were of younger age (46.4 ± 1 vs 51.9 ± 1.2 years; P < .001). The average ...
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ABSTRACT Solvent-based post-combustion carbon capture (PCC) technology though being the best available option for large-scale carbon capture and sequestration (CCS) projects, faces the drawback of high energy intensity and large capital... more
ABSTRACT Solvent-based post-combustion carbon capture (PCC) technology though being the best available option for large-scale carbon capture and sequestration (CCS) projects, faces the drawback of high energy intensity and large capital cost. Therefore, process optimization plays a key role in further improvement of the performance efficiency and curbing the costs. The PCC technology involves complex reactive separations for which achieving the goal of an optimized process requires existence of a rigorous design methodology considering both operation and design parameters. In this paper, an equation-based methodology is developed for optimal synthesis and design of absorption and desorption columns considering rate-based interaction of the gas and liquid. The design methodology considers all the influential techno-economic parameters such as number of absorber/desorber columns, height and diameter of columns, operating conditions (P, T) of columns, pressure drop, packing type, percentage of CO2 avoided, captured CO2 purity, amount of regeneration, and flooding velocities of columns. An example is solved for a 300 MW coal-fired power plant and numerous parametric analyses are performed using 30 wt% monoethanolamine (MEA) solvent. The parametric study shows that the design and operation parameters are markedly interactive, and that a successful solvent-based PCC design requires concurrent consideration of both aspects.
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Previous research conducted into the use of the human ear in the field of forensic identification has focused upon the use of grids and manual methods to measure and catalogue the different anatomical features of the ear. To date, few... more
Previous research conducted into the use of the human ear in the field of forensic identification has focused upon the use of grids and manual methods to measure and catalogue the different anatomical features of the ear. To date, few have considered the importance of the presence of ear piercings and their possible role in human identification. This study aims to highlight the common distribution of piercings of both ears in both genders and to explore the effect of piercings on earprints. The presence of a piercing may, in part, help to explain why partial and not whole earprints are sometimes recovered from a scene of crime (suggesting that the offender&amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;#39;s ears may be pierced). The presence of piercings through the tragus and the superior part of the helix are shown to be infrequent and thus may be used to assist the identification of a body, due to its relative rarity with respect to piercings found in other areas of the ear.
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up CT imaging and the microscopic examination showed intraarterial degradation of gelfoam and microsphere. The blood tests demonstrated insignificant changes of liver and renal functions. Conclusion: Our microspheres, with the... more
up CT imaging and the microscopic examination showed intraarterial degradation of gelfoam and microsphere. The blood tests demonstrated insignificant changes of liver and renal functions. Conclusion: Our microspheres, with the characteristics of calibrated, radiopaque, and biodegradable, can be used for TAE with effects equivalent to or better than gelfoam and embosphere in pigs. Currently used drug-eluting beads can only be bound by positive charged drugs. As our microsphere was made of pharmaceutical excipients, it will not be limited to the electric charge of drugs and has a potential to combinewith different chemotoxic agents for TACE. Hemodynamic Changes of Liver Before and After Embolization
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Research Interests: Cardiology, Comparative Study, Medicine, Pathophysiology, Heart Failure, and 15 moreHumans, Internal Medicine, Female, Clinical, Male, Duration, Length of Stay, Aged, Analysis of Variance, Clinical Cardiology, Ejection Fraction, Digoxin, Clinical Presentation, Medical History Taking, and Cardiovascular medicine and haematology
Research Interests: Chemical Engineering, Chemistry, Kinetics, Modeling, Crystallization, and 15 moreDynamic Optimization, Parameter estimation, Optimization, Growth, Crystals, Nucleation, Dissolution, Coefficient of Variation, Csd, Heating, Particle Size Distribution, Crystal Size Distribution, Biological System, Objective function, and Population Balance Model
Research Interests: Engineering, Environmental Science, Economics, Combustion, Power Plant, and 15 moreProcess Engineering, Electricity, Feasibility Study, Fossil Fuels, Case Study, Electricity prices, New South Wales, Energy Intensity, Solar Collector, Applied Energy, Retrofitting, Sizing, Electricity Generation, CO Emission, and Coal Fired Power Plant
Pilomatrix carcinoma is the malignant counterpart of the pilomatrixoma which is a hamartoma of the hair matrix. It is a rare locally aggressive skin tumor with a great tendency for recurrence but its metastatic potential is limited. We... more
Pilomatrix carcinoma is the malignant counterpart of the pilomatrixoma which is a hamartoma of the hair matrix. It is a rare locally aggressive skin tumor with a great tendency for recurrence but its metastatic potential is limited. We report a pilomatrix carcinoma with proven ...
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Accurate Diagnosis of lung disease depends on understanding the sounds emanating from lung and its location. Lung sounds are of significance as they supply precise and important information on the health of the respiratory system. In... more
Accurate Diagnosis of lung disease depends on understanding the sounds emanating from lung and its location. Lung sounds are of significance as they supply precise and important information on the health of the respiratory system. In addition, correct interpretation of breath sounds depends on a systematic approach to auscultation; it also requires the ability to describe the location of abnormal finding in relation to bony structures and anatomic landmark lines. Lungs consist of number of lobes; each lung lobe is further subdivided into smaller segments. These segments are attached to each other. Knowledge of the position of the lung segments is useful and important during the auscultation and diagnosis of the lung diseases. Usually the medical doctors give the location of the infection a segmental position reference. Breath sounds are auscultated over the anterior chest wall surface, the lateral chest wall surfaces, and posterior chest wall surface. Adventitious sounds from different location can be detected. It is common to seek confirmation of the sound detection and its location using invasive and potentially harmful imaging diagnosis techniques like x-rays. To overcome this limitation and for fast, reliable, accurate, and inexpensive diagnose a technique is developed in this research for identifying the location of infection through a computerized auscultation system.