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In this paper, a problem of robust fault detection for uncertain networked control system (NCS) including random data packet loss is investigated. This NCS is established as a stochastic system with norm-bounded uncertainty, in which the stochastic variable is followed by Bernoulli distribution. Then, a robust fault detection filter (FDF) is designed based on the observer method, which is obtained...
The heavy rainfall accompanying typhoons and summer torrential rains washes organic sediment from the high mountains into the deep sea southwest of Taiwan. The waters depth is over 1000 m just 30 km off the coast. Moreover, Taiwan locates on the collision zone of Eurasian Plate and Philippine Sea Plate. Thick layers of organic sediment, along with activities of tectonic plate movement provides a perfect...
A novel all fiber optic sensing monitoring technique is researched for remotely detecting the concentration of methane gas. The triangular signal is used to modulate the light wavelength of the DFB laser. The narrow absorption line of the laser eliminates the cross sensitivity to moisture, ethane or other gases. With the use of the optical fiber links between monitor and sensor header, the system...
Nodes layout is a critical issue affecting the quality of service of camera networks. The layout aims at adopting the least number of cameras to cover the whole scene with expected observation quality. This is generally formulated as a non-convex optimization problem which is hard to be solved in polynomial time. In this paper, we propose an efficient near-optimal convex solution for layout guaranteeing...
Various types of tin oxide particle, including square SnO platelets, truncated octahedral SnO crystals, and monodispepersed SnO 2 nanoparticles, were synthesized by the dissolution and recrystallization of bulk SnO powder via the thermal decomposition of tin oleate in a coordinating solvent of tri-n-octylamine at 340°C. The results reveal that the atmosphere and reaction time are important...
The multiplexed fiber Bragg grating (FBG) micro seismic monitoring system with high sensitivity based on wavelength division multiplexing (WDM) and narrow line-width laser filtering demodulation is introduced. The highly sensitive acceleration probe based on FBG and a kind of cantilever structure is used in the system. The wavelength dynamic change of FBG is interrogated by narrow line-width laser...
Taiwan is located near the edge of the continental Eurasia plate and the Philippine Sea plate, a quake-prone zone. Averagely speaking, out of 1000 sensible quakes detected per year, more than 50% of the epicenters are located in the surrounding waters. Therefore, there is a great need from our seismology community to deploy ocean bottom seismometer (OBS) to have high fidelity data, and widen the aperture...
This study proposes an algorithm to estimate the alignment errors of an ultra short baseline (USBL) navigation system. This algorithm is based on positioning errors caused by heading, pitch, and roll misalignments, respectively, when running a straight-line USBL transponder positioning. The positioning errors arising from each of the angular misalignments were derived. The differences of positioning...
Deploying wireless sensor networks (WSNs) has been an area of interest in recent years. Adoption of WSNs with energy efficiency is a critical issue since the energy of sensor nodes is usually rather limited. Energy-efficient coverage control is regarded as an essential factor influencing the performance of WSNs. Coverage might gradually degrade after the activation of WSNs. Thus, a novel coverage-preserving...
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