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A validation study was conducted to study the performance on detection of underground void underneath pedestrian walkway by the use of ground penetrating radar (GPR). The experiment was carried out on a footpath which locates adjacent to the lateral support of a deep excavation works. 3 number of GPR scans were carried out, 7 nos. and 5 nos. of suspected voids and water leakage points from drain were...
It is quite common that the quality is measured by a categorical factor, which is classified into several ordinal levels. Usually, a specific multinomial distribution is utilized to characterize the counts corresponding to each level. However, it neglects the order among the factor levels and a control chart based on it may fail to achieve ideal performance. In this work, the ordinal information is...
We present in this paper our development of a cyber physical sensing platform for monitoring the structural tension of large bridge cables using MEMS vibration sensors and proprietary wireless technology. In order to implement the online tension analysis of the bridge cables, we developed an improved technology for the general identification of cable tension using the Gauss-Newton method to determine...
Our RADARSAT 2 InSAR monitoring of two SAGD oil sands sites shows high correlation of surface deformation and steam injection. Surface heave is about 2 cm/year on these SAGD sites. The short time series InSAR profiles from COSMO SkyMed images shows improved surface heave propagation distance under different injection depths and over burden properties and thickness. This more rapid InSAR heave results...
Despite the fact that MEMS devices have become common in many electronic products, methods for their reliability assessment are still undeveloped. One significant difference to the reliability assessment of conventional electronic component boards is that MEMS devices require a stimulus or means to measure an output in order to monitor their health while the MEMS assemblies are exposed to loadings...
Textile based sensors were developed and used for remote monitoring of breathing. The breathing is simulated by using a new cyclic tester device. In the simulated a cyclic force is applied along the length of the textile sensor. However due to the morphology of human body, in real situation the sensor is not only under stretching but also under a certain degree of bending. A prototype garment with...
The occurrence of vector-borne West Nile virus in North America has prompted the use of chemical larvicides such as methoprene for widespread urban mosquito control. Since 2003, municipalities in southern Ontario have applied methoprene pellets or ingots to storm water catch basins over the summer. Ryerson University studied the fate and transport of methoprene from a storm sewer system to its receiving...
Today hospitals are equipped with many electronic transmitting devices, which results in electromagnetic interference that may impair wireless transmissions between medical devices. On the other hand, reliable and continuous collection via wireless communications of patient vital signs such as blood pressure and flow, core temperature, ECG, carbon dioxide (CO2) concentration is crucial for making...
With a continuously tunable free space optical delay interferometer and direct detection D(Q)PSK signals can be received at varying symbol rates or under optimized conditions. The interferometer's phase is stabilized and its polarization dependence mitigated.
The increased complexity of today's distributed, composite, Web-based systems presents difficult and unique systems management problems. The way these systems interact, and the fact that they often span organizational boundaries, render them difficult to monitor and manage. Autonomic computing has emerged as a promising approach to the management of complex systems. A key to realizing fully autonomic...
The Markov chain model can be found in the maintenance and repair problems since the early 60's, is introduced to the maintenance of road infrastructure in the 1980's, and is made to drive the current bridge maintenance optimization systems. While this model results into solvable programming problems and provides a solution, there are a number of criticisms associated with it. In this article, we...
The Flood Dragon project enhances the Envisat contribution for natural disaster monitoring such as flooding. During the 2005 and 2006 Chinese flood seasons, over the 23 attempted NRT exploitations of Envisat, 19 were successful, allowing exploitation of emergency programming procedures as well as Rolling Archive capabilities (based on ordinary long term acquisition scheduling). Obtained results are...
A novel method of tool wear monitoring based on variation features was proposed to increase recognized precision of monitoring system and solve the problem of feature selection under multi machining conditions. The trend of different signal features with the change of tool wear amounts were investigated through analyzing vibration signal, acoustic emission signal and cutting forces signal in time...
Arterial compliance is known to be pressure-dependent, but its variation within any given cardiac cycle has not been clearly illustrated. We reported first such evaluation by incorporating a nonlinear compliance in the form of C(P) = a exp(bP) substituting for the linear compliance in a three element modified windkessel model of the systemic arterial system. Results show that C(P) varies continuously...
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