State estimation for asynchronous multirate multisensor dynamic systems with missing measurements

Yan, Liping; Zhou, Donghua; Fu, Mengyin; Xia, Yuanqing

doi:10.1049/iet-spr.2009.0215

Cited by 77 publications

(67 citation statements)

References 19 publications

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“…Commonly used standard for mechanical testing of scaffold is compression testing of standard cylindrical shape scaffold under the American Society for Testing Materials (ASTM) [35, 36]. It has been a problem to test mechanical properties of non-cylindrical scaffolds due to the absence of standard procedure.…”

Section: Introductionmentioning

confidence: 99%

Injectable porous nano-hydroxyapatite/chitosan/tripolyphosphate scaffolds with improved compressive strength for bone regeneration

Uswatta

Okeke

Jayasuriya

2016

Materials Science and Engineering: C

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In this study we have fabricated porous injectable spherical scaffolds using chitosan biopolymer, sodium tripolyphosphate (TPP) and nano-hydroxyapatite (nHA). TPP was primarily used as an ionic crosslinker to crosslink nHA/chitosan droplets. We hypothesized that incorporating nHA into chitosan could support osteoconduction by emulating the mineralized cortical bone structure, and improve the Ultimate Compressive Strength (UCS) of the scaffolds. We prepared chitosan solutions with 0.5%, 1% and 2% (w/v) nHA concentration and used simple coacervation and lyophilization techniques to obtain spherical scaffolds. Lyophilized spherical scaffolds had a mean diameter of 1.33 mm (n=25). Further, portion from each group lyophilized scaffolds were soaked and dried to obtain Lyophilized Soaked and Dried (LSD) scaffolds. LSD scaffolds had a mean diameter of 0.93 mm (n=25) which is promising property for the injectability. Scanning Electron Microscopy images showed porous surface morphology and interconnected pore structures inside the scaffolds. Lyophilized and LSD scaffolds had surface pores less than 10 and 2 µm, respectively. 2% nHA/chitosan LSD scaffolds exhibited UCS of 8.59 MPa compared to UCS of 2% nHA/chitosan lyophilized scaffolds at 3.93 MPa. Standardize UCS values were 79.98 MPa and 357 MPa for 2% nHA/chitosan lyophilized and LSD particles respectively. One-way ANOVA results showed a significant increase (p < 0.001) in UCS of 1% and 2% nHA/chitosan lyophilized scaffolds compared to 0% and 0.5% nHA/chitosan lyophilized scaffolds. Moreover, 2% nHA LSD scaffolds had significantly increased (p < 0.005) their mean UCS by 120% compared to 2% nHA lyophilized scaffolds. In a drawback, all scaffolds have lost their mechanical properties by 95% on the 2nd day when fully immersed in phosphate buffered saline. Additionally live and dead cell assay showed no cytotoxicity and excellent osteoblast attachment to both lyophilized and LSD scaffolds at the end of 14th day of in vitro studies. 2% nHA/chitosan scaffolds showed higher osteoblast attachment than 0% nHA/chitosan scaffolds.

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Section: Introductionmentioning

confidence: 99%

Injectable porous nano-hydroxyapatite/chitosan/tripolyphosphate scaffolds with improved compressive strength for bone regeneration

Uswatta

Okeke

Jayasuriya

2016

Materials Science and Engineering: C

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“…The filtering problem for networked systems has been a focus of research due to their important engineering applications such as target tracking, signal processing and control application [5][6][7][8]. It is well known that the Kalman filtering is the classical scheme to deal with the estimation problem effectively.…”

Section: Introductionmentioning

confidence: 99%

H∞filtering for networked linear systems with multiple packet dropouts and random delays

Sun

2015

Digital Signal Processing

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“…For sensors having different sampling rates at different scales, multiscale system theory is a useful tool. Our work stems from multiscale system theory but provides a new multiscale modeling architecture that is not limited to the wavelet [10,11,33]. In [11], the state at a coarser scale is modeled by the moving average of states at the finest scale; in [11] and [33], the backward model and the forward model were presented, respectively, through certain modifications of the moving average model.…”

Section: Introductionmentioning

confidence: 99%

Modeling and estimation of asynchronous multirate multisensor system with unreliable measurements

Yan

Xia

et al. 2015

IEEE Trans. Aerosp. Electron. Syst.

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This paper is concerned with state estimation of a linear system by fusion of asynchronous, multirate, multisensor data. The system is described at the finest scale with multiple sensors observing a common thing independently at different scales with different sampling rates. Unreliable measurements are available. The main results are: the multiscale system is properly formulated, a credibility measure is constructed and used to determine whether the measurement is normal or faulty, and an optimal recursive fusion algorithm is presented. The effectiveness and stability of the algorithm under unreliable measurements are analyzed. A Manuscript

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State estimation for asynchronous multirate multisensor dynamic systems with missing measurements

Cited by 77 publications

References 19 publications

Injectable porous nano-hydroxyapatite/chitosan/tripolyphosphate scaffolds with improved compressive strength for bone regeneration

Injectable porous nano-hydroxyapatite/chitosan/tripolyphosphate scaffolds with improved compressive strength for bone regeneration

H∞filtering for networked linear systems with multiple packet dropouts and random delays

Modeling and estimation of asynchronous multirate multisensor system with unreliable measurements

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