Papers by Keyword: SOS

Abstract: The state feedback control using sum of squares technique (SOStools) combined with the nonlinear observer is applied to the depth control of a submarine. The mathematical model of the submarine is rewritten as the linear-like form, then the uncertainty caused by the variation of the hydrodynamic coefficients is treated as the disturbance, which can be estimated online by a nonlinear observer. The method can provide good robustness against the nonlinearity as well as the uncertainty, which is verified by the simulation.

Abstract: Aimed to the complexity of and weapon equipment system of system (SoS) and demonstration process, we demonstrated the building needs of hall for workshop of meta-synthetic engineering (HWME) for demonstration on weapon equipment SoS from the angle of function and application. Based on the process of demonstration, the framework of HWME for demonstration of weapon equipment system was built. Based on the mechanism of message transferring, arithmetic and mutual ability, the discussion system of weapon equipment SoS was designed by intelligent decision, group decision, parallel engineering. At last, the paper gave the mutual relation on each composing of the discussion system.

Abstract: Most ultrasound diagnosing systems for osteoporosis lack diagnostic precision due to the measurement of specific regions of interest (ROI). As well as using the existing ROI measurement method, this study introduced the concept of analyzing the distribution patterns of bone quality. Linear scanning and ultrasound transmission techniques were used to obtain the broadband ultrasound attenuation (BUA) images of the calcaneus. A 13mm-diameter ROI was selected as the position of minimum BUA value locally in the posterior calcaneus. Mean values of BUA and speed of sound (SOS) at the ROI, as well as the osteoporosis index (OI), by their linear combination, were defined. For a more accurate diagnosis of osteoporosis, OI and images of the bone quality distribution of the calcaneus were utilized together. The calcaneus is inhomogeneous and, furthermore, its images are not perpendicular to the direction of the ultrasound beam. Hence, the mean values of BUA and SOS for the entire calcaneus do not have any significant meaning. Accordingly, four image patterns of other OI in the calcaneus were defined in order to increase the correlation between diagnostic parameter and age. The results revealed a higher correlation between the bone quality index and age (r=0.75, p<0.0001), for which the pattern index was reflected on OI, than that (r=0.65, p<0.0001) of OI merely at ROI. This result confirmed the possibility of a new osteoporosis diagnostic method using the BUA distribution images of the entire calcaneus.