A5061522977- Antenna Design and Analysis
- Energy Harvesting in Wireless Networks
- Advanced Antenna and Metasurface Technologies
- Sports Performance and Training
- Wireless Body Area Networks
- Geophysical and Geoelectrical Methods
- Antenna Design and Optimization
- Microwave Engineering and Waveguides
- Geophysical Methods and Applications
- RFID technology advancements
- Seismic Waves and Analysis
- Sports Dynamics and Biomechanics
- Soil Moisture and Remote Sensing
- Winter Sports Injuries and Performance
- Sports injuries and prevention
- Non-Invasive Vital Sign Monitoring
- Electromagnetic Scattering and Analysis
- Underwater Vehicles and Communication Systems
- Electromagnetic Simulation and Numerical Methods
- Energy Efficient Wireless Sensor Networks
- Bluetooth and Wireless Communication Technologies
- Electromagnetic Compatibility and Measurements
- Graphene research and applications
- Earthquake Detection and Analysis
- Experimental Learning in Engineering
Griffith University
2016-2025
Queensland Academy of Sport
2010-2012
California Polytechnic State University
2011
University of Georgia
2011
Kenyon College
2011
University of Florida
2011
Boeing (United States)
2006
University of Wisconsin–Madison
1982
United States Department of the Army
1980
James Cook University
1973
Wireless sensor networks (WSN) are emerging as a valuable tool in many fields of science and industry. Time synchronization is an important issue for WSN's due to the collaborative distributed nature tasks they perform. This paper describes new technique clock WSNs called consensus that provides internal virtual clock. It sensitive limited resources available nodes robust challenges faced dynamic ad-hoc networks. Simulations presented analyse effectiveness protocol mesh network.
Abstract Laser reduction of graphene oxide has attracted significant interest in recent years, because it offers a highly flexible, rapid, and chemical‐free fabrication route that can directly write on almost any solid substrate with down to sub‐micrometer feature size. Laser‐reduced (LRG) is explored for various important applications such as supercapacitors, sensors, field effect transistors, holograms, solar cells, flat lenses, bolometers, thermal sound sources, cancer treatment, water...
Tracing leaks of airborne radioactive, poisonous or flammable materials is a potentially dangerous activity that could be undertaken by robotic systems. This paper describes practical investigation the possibility developing simple, low cost, autonomous robots to perform this task. It envisaged these would used in large numbers. improve reliability through redundancy and provide area coverage from wide distribution robots. Failure single unit not jeopardise overall sensing operation. Sensing...
Frequency-selective surfaces (FSSs) on thin substrates using screen printing technology are popular due to their flexible nature, low profile, easy installation, and low-cost mass production. This paper proposes the deployment of printed FSS window panes in office buildings investigates shielding effect radio wave propagation through such structures. The surface is an array modified meandered squares with a unit cell size <inline-formula xmlns:mml="http://www.w3.org/1998/Math/MathML"...
Hand speed is particularly important in boxing both for protection against incoming blows and delivering blows. Sixteen amateur boxers (10 male, 6 female) with varying levels of experience from a gym performed 20 jabs cross punches air. The movement was recorded small wrist mounted accelerometer under the glove. maximum velocity each punch determined RMS acceleration profile. mean values jab maximal higher than 9 participants. showed some dependence on reach (Spearman's correlation...
Base-station tracking in mobile communications benefits from a directional antenna and so requires direction finding technology. A novel technique for electronically directing the radiation pattern of an array employs with only one active element three parasitic elements operating near resonance. Three different methods are assessed; coarse angular location method, precise method assuming incident beam, multiple beams. An n elements, if used conjunction relatively simple controller, can be...
A thin artificial dielectric layer consisting of a rectangular array closely spaced, conductive cylinders (pins), was constructed above perfectly conducting ground plane. The reactance the surface measured at 4.8 GHz for variety pin heights and embedding material by measuring height-gain profile transverse magnetic (TM) wave launched across it. Design equations using theories artifical dielectrics propagation in anisotropic media are given. These can be used to predict providing correction...
A switched parasitic monopole antenna on a finite ground structure with conductive sleeve attached to small, circular plane controls the vertical radiation direction. The was designed using genetic algorithm and element (FEM) solver. At 1.575 GHz, constructed exhibited front back ratio of 10.7 dB gain 6.4 dBi no elevation from horizontal. nature allowed it steer directional beam through 5 locations in azimuth. Incremented 0/spl lambda/ 0.45/spl lambda/, observed linearly depress main lobe...
There has been considerable public concern regarding the effects of repetitive head impacts associated with heading ball in soccer. This is relevant for adolescents whose brains are undergoing rapid development. The study investigated relationship between strength, proprioception, endurance and range motion cervical spine adolescent male soccer players. participants were 20 skilled players aged 15-18 years. Outcome measures included questionnaires, assessments function (range motion, joint...
This paper describes a dual-frequency circularly polarized electronically steerable microstrip patch antenna array suitable for land-mobile communications. Based on four-element Yagi-Uda (1928) antenna, the four antennas forming are located radially from single square reflector double-sided printed circuit board. The main lobe of covers elevation angles 20 to 70/spl deg/ with peak gain 8.4 dBi at 1.54 GHz and 11.7 1.62 GHz. Full azimuthal coverage is possible by switching between elements.
A new technique is presented demonstrating the use of switched parasitic elements in electronic beam steering applications. Experimental and theoretical results are for a linearly polarised five element steerable patch antenna array operating at 1.55 GHz. Shorted have been used to steer two directions tracking polar orbiting satellites. The minimum gain system elevation angles >20° above horizon -1.5 dBi forward direction.
Fitness development and performance assessment of elite athletes requires an understanding many physiological factors, these are direct indirect measures athlete energy expenditure. Many methods factor assessments require the to be constrained by laboratory equipment or periodic interruption activity take measurements such as blood samples required taken. This paper presents a method that is entirely ambulatory noninvasive, using microelectromechanical systems (MEMS) accelerometers. The...
This paper describes the development of a complete wearable swimming system for performance analysis, together with sample application. The comprises nodes, data processing tools in MATLAB™ and integration video. nodes are small size designed to be worn on body segments interest, typically lower leg, arm, sacral or cervical regions. Each node contains inertial sensors, screen, storage RF communications synchronisation download. device is controlled using microcontroller scheduler-based...