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  • SAGE Publications  (13)
  • 1
    Online Resource
    Online Resource
    Cooperative Localization of Multi-UAVs via Dynamic Nonparametric Belief Propagation under GPS Signal Loss Condition
    SAGE Publications ; 2014
    In:  International Journal of Distributed Sensor Networks Vol. 10, No. 2 ( 2014-02-01), p. 562380-
    Details
    In: International Journal of Distributed Sensor Networks, SAGE Publications, Vol. 10, No. 2 ( 2014-02-01), p. 562380-
    Abstract: Self-localization is critical for many unmanned aerial vehicles (UAVs) tasks such as formation flight, path planning, and activity coordination. Traditionally, UAV can locate itself using GPS combined with some inertial sensors. However, due to the complex flight environment or failure of the GPS receiver, the UAV may lose its GPS signal and fail to locate itself, resulting in devastating consequence. In this paper, we will consider the problem of cooperative localization among multiple UAVs, in which the UAVs with failure of GPS receiver can help each other to locate themselves through mutual information exchanged based on the relative distance measurements. Specifically, we propose a dynamic Nonparametric Belief Propagation (dNBP) algorithm to calculate the posterior distribution of UAV's position conditioned on all observations made in the whole UAVs group. The dNBP is a natural combination of NBP with particle filtering, suitable for treating with the nonlinear model and highly non-Gaussian distributions arising in our application. Furthermore, dNBP provides the basis for distributed algorithm in which messages are exchanges between neighboring UAVs. Thus, the computational burden is distributed across UAVs. Simulations in Matlab environment show the effectiveness of our method.
    Type of Medium: Online Resource
    ISSN: 1550-1477 , 1550-1477
    URL: Article
    DOI: 10.1155/2014/562380
    Language: English
    Publisher: SAGE Publications
    Publication Date: 2014
    detail.hit.zdb_id: 2192922-1
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  • 2
    Online Resource
    Online Resource
    Effect of lignin–cellulose nanofibrils on the hydrophilicity and mechanical properties of polyethersulfone ultrafiltration membranes
    SAGE Publications ; 2016
    In:  High Performance Polymers Vol. 28, No. 10 ( 2016-12), p. 1192-1200
    Details
    In: High Performance Polymers, SAGE Publications, Vol. 28, No. 10 ( 2016-12), p. 1192-1200
    Abstract: In the present research, novel polyethersulfone (PES)/lignin–cellulose nanofibril (LCN) blend ultrafiltration membranes with high hydrophilicity and noticeable mechanical properties were prepared via immersion precipitation method. LCN was employed to improve the hydrophilicity and mechanical properties of pure PES ultrafiltration membranes. Transmission electron microscopy and Fourier transform infrared spectroscopy (FTIR) were used to characterize the structure of the LCN. The performance of blend ultrafiltration membranes were characterized in terms of FTIR, thermogravimetric analysis, scanning electron microscopy, pure water flux (PWF), bovine serum albumin retention, water contact angle, surface energy, and mechanical properties. With the increase in content of LCN from 0 wt% to 1.2 wt%, the PWF improved from 322.8 L m −2 h −1 to 692.3 L m −2 h −1 and the tensile strength increased from 4.8 MPa to 7.2 MPa. It was revealed that the addition of LCN could improve the hydrophilicity and mechanical properties of pure PES ultrafiltration membrane.
    Type of Medium: Online Resource
    ISSN: 0954-0083 , 1361-6412
    URL: Article
    DOI: 10.1177/0954008315621611
    Language: English
    Publisher: SAGE Publications
    Publication Date: 2016
    detail.hit.zdb_id: 1483713-4
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  • 3
    Online Resource
    Online Resource
    Ambient particulate matter on DNA damage in HepG2 cells
    SAGE Publications ; 2011
    In:  Toxicology and Industrial Health Vol. 27, No. 1 ( 2011-02), p. 87-95
    Details
    In: Toxicology and Industrial Health, SAGE Publications, Vol. 27, No. 1 ( 2011-02), p. 87-95
    Abstract: Ambient particulate matter (PM) has been reported to be associated with increased respiratory, cardiovascular, and malignant lung diseases. The aim of the present study was to investigate the variability of the DNA-damage induced by thoracic particles (PM 10 ) sampled in different locations and seasons (2006) in Dalian, China, in human hepatoma G2 (HepG2) cells. Significant differences in percentage of tail DNA induced by the extractable organic matter of PM 10 were revealed between summer and winter seasons and among monitoring sites in single cell gel electrophoresis (SCGE) assay. The percentage of tail DNA in HepG2 cells significantly increased in a dose-dependent manner after exposure to 7.5 and 30 μg/mL extractable organic matter of PM 10 for 1 hour. In order to clarify the underlying mechanisms, we evaluated the level of reactive oxygen species (ROS) production with the 2, 7-dichloro-fluorescein diacetate (DCFH-DA) assay. Significantly increased level of ROS was observed in HepG2 cells at higher concentrations (15 and 30 μg/mL). Significantly increased levels of 8-hydroxydeoxyguanosine (8-OHdG) were also shown in HepG2 cells. In this study, the accumulation of nuclear factor kappa B (NF-κB) p65 protein induced by the extractable organic matter of PM 10 was detected by western blotting in HepG2 cells, and the protein expression of NF-κB p65 significantly increased after the treatment with 30 μg/mL extractable organic matter of PM 10 for 24 hours. These results indicate that the extractable organic matter of PM 10 causes DNA strand breaks in HepG2 cells, and significant differences in percentage of tail DNA in dependence on locality and season are revealed. The extractable organic matter of PM 10 exerts DNA damage effects in HepG2 cells, probably through oxidative DNA damage induced by intracellular ROS, increase of 8-OHdG formation, and protein expression of NF-κB p65.
    Type of Medium: Online Resource
    ISSN: 0748-2337 , 1477-0393
    URL: Article
    DOI: 10.1177/0748233710387001
    Language: English
    Publisher: SAGE Publications
    Publication Date: 2011
    detail.hit.zdb_id: 2010891-6
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  • 4
    Online Resource
    Online Resource
    An objective and subjective study on global active control of engine noise in a car
    SAGE Publications ; 2024
    In:  Journal of Vibration and Control Vol. 30, No. 9-10 ( 2024-05), p. 2311-2321
    Details
    In: Journal of Vibration and Control, SAGE Publications, Vol. 30, No. 9-10 ( 2024-05), p. 2311-2321
    Abstract: The work tests and analyzes the engine noise distribution in a car with and without active control, where the car’s built-in loudspeakers are used as secondary sources to attenuate the engine noise inside the whole cabin. To analyze the sound field in detail, the noise level at 52 microphones on the passenger ears’ plane is measured and presented. The distributions of the primary overall noise, first four order noise of the engine, and the sound field generated by the subwoofer at engine orders’ frequencies are reported, and the noise reductions corresponding to overall engine noise and each order’s noise are analyzed. Besides, jury test is presented and compared with the calculated loudness of residual noise to evaluate the acoustic comfort improvement of the system. The experiment results show that the overall noise reduction is achieved inside the whole cabin by controlling the first four orders’ engine noise. The average noise reduction of the measurement area inside the cabin is 6.2 dB and 2.9 dBA. Besides, 93% of the participants feel the acoustic comfort is improved with the active noise control system on.
    Type of Medium: Online Resource
    ISSN: 1077-5463 , 1741-2986
    URL: Article
    DOI: 10.1177/10775463231174730
    Language: English
    Publisher: SAGE Publications
    Publication Date: 2024
    detail.hit.zdb_id: 2070247-4
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  • 5
    Online Resource
    Online Resource
    Robust adaptive attitude manoeuvre control with finite-time convergence for a flexible spacecraft
    SAGE Publications ; 2018
    In:  Transactions of the Institute of Measurement and Control Vol. 40, No. 2 ( 2018-01), p. 425-435
    Details
    In: Transactions of the Institute of Measurement and Control, SAGE Publications, Vol. 40, No. 2 ( 2018-01), p. 425-435
    Abstract: This paper investigates a finite-time attitude manoeuvre control problem for a flexible spacecraft subject to bounded external disturbances. A robust discontinuous finite-time controller with terminal sliding mode control is designed to solve this problem provided that the disturbances and the coupling effect of flexible modes are bounded with a known boundary. The controller is further enhanced by an adaptive scheme to deal with the more practical case that the boundary is unknown. The enhanced version is continuous and chattering-free. The results are rigorously proved using the Lyapunov stability theory. The effectiveness and robustness of the proposed controllers are demonstrated by numerical simulation.
    Type of Medium: Online Resource
    ISSN: 0142-3312 , 1477-0369
    URL: Article
    DOI: 10.1177/0142331216659337
    Language: English
    Publisher: SAGE Publications
    Publication Date: 2018
    detail.hit.zdb_id: 2025882-3
    SSG: 3,2
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  • 6
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    Non-invasive high-frequency oscillatory ventilation in preterm infants after extubation: a randomized, controlled trial
    SAGE Publications ; 2021
    In:  Journal of International Medical Research Vol. 49, No. 2 ( 2021-02), p. 030006052098491-
    Details
    In: Journal of International Medical Research, SAGE Publications, Vol. 49, No. 2 ( 2021-02), p. 030006052098491-
    Abstract: To investigate the effectiveness and safety of non-invasive high-frequency oscillatory ventilation (NHFOV) in post-extubation preterm infants. Methods This was a randomized, controlled trial. A total of 149 preterm infants aged between 25 to 34 weeks’ gestational age with a birth weight of 〈 1500 g who required invasive mechanical ventilation on admission were included. After extubation, they were randomized to the NHFOV group (n = 47), nasal intermittent positive pressure ventilation (NIPPV) group (n = 51), or nasal continuous positive airway pressure (NCPAP) group (n = 51). We compared the effectiveness and safety among these three groups. Results A total of 139 preterm infants finally completed the study. The reintubation rate was significantly lower in the NHFOV group than in the other groups. The duration of non-invasive ventilation and the length of hospital stay in the NHFOV and NIPPV groups were significantly shorter than those in the NCPAP group. The incidence of bronchopulmonary dysplasia in the NHFOV and NIPPV groups was significantly lower than that in the NCPAP group. The NHFOV group had significantly less nasal injury than the NCPAP group. Conclusion As post-extubation respiratory support in preterm infants, NHFOV has a lower reintubation rate compared with NCPAP and NIPPV, without increasing the rate of complications.
    Type of Medium: Online Resource
    ISSN: 0300-0605 , 1473-2300
    URL: Article
    DOI: 10.1177/0300060520984915
    Language: English
    Publisher: SAGE Publications
    Publication Date: 2021
    detail.hit.zdb_id: 2082422-1
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  • 7
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    An efficient life prediction methodology for low cycle fatigue–creep based on ductility exhaustion theory
    SAGE Publications ; 2013
    In:  International Journal of Damage Mechanics Vol. 22, No. 4 ( 2013-05), p. 556-571
    Details
    In: International Journal of Damage Mechanics, SAGE Publications, Vol. 22, No. 4 ( 2013-05), p. 556-571
    Abstract: Low cycle fatigue–creep is the main reason for the failures of many engineering components under high temperature and cyclic loading. Based on the exhaustion of the static toughness and dissipation of the plastic strain energy during fatigue failure, a new low cycle fatigue–creep life prediction model that is consistent with the fatigue–creep damage mechanism and sensitive to the fatigue damage process is presented in an attempt to develop viscosity-based approaches for general use in isothermal and thermo-mechanical loading. In this model, the theory of ductility exhaustion is used to describe the process of fatigue–creep interaction. It was assumed that the ductility exhaustion related only to the plastic strain and creep strain caused by tensile stress under stress-controlled conditions. In addition, the mechanisms of loading waveform, creep and mean stress effects were taken into account in a low cycle fatigue–creep regime. The predicted lives by the proposed model agree well with the reported experimental data from literature under different temperature loading conditions.
    Type of Medium: Online Resource
    ISSN: 1056-7895 , 1530-7921
    URL: Article
    DOI: 10.1177/1056789512456030
    Language: English
    Publisher: SAGE Publications
    Publication Date: 2013
    detail.hit.zdb_id: 2052623-4
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  • 8
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    Comprehensive Analysis of a Long Noncoding RNA-Associated Competing Endogenous RNA Network in Wilms Tumor
    SAGE Publications ; 2020
    In:  Cancer Control Vol. 27, No. 2 ( 2020-04-01), p. 107327482093699-
    Details
    In: Cancer Control, SAGE Publications, Vol. 27, No. 2 ( 2020-04-01), p. 107327482093699-
    Abstract: Long noncoding RNA (lncRNA) plays crucial roles in various biological processes of different cancers, especially acting as a competing endogenous RNA (ceRNA). However, the role of lncRNA-mediated ceRNA in Wilms tumor (WT), which is the most common malignant kidney cancer in children, remains unknown. In present study, RNA sequence profiles and clinical data of 125 patients with WT consisting of 119 tumor and 6 normal tissues from Therapeutically Applicable Research To Generate Effective Treatments database were analyzed. A total of 1833 lncRNAs, 156 microRNAs (miRNAs), and 3443 messenger RNAs (mRNAs) were identified as differentially expressed (DE) using “DESeq2” package. The lncRNA-miRNA-mRNA ceRNA regulatory network involving 748 DElncRNAs, 33 DEmiRNAs, and 189 DEmRNAs was constructed based on miRcode, Targetscan, miRTarBase, and miRDB database. Gene Ontology term and Kyoto Encyclopedia of Genes and Genomes pathway analyses revealed that DEmRNAs were mainly enriched in cell proliferation-related processes and tumor-related pathways, respectively, and 13 hub genes were identified by a protein–protein interaction network. Survival analysis detected 48 lncRNAs, 7 miRNAs, and 16 mRNAs to have significant impact on the overall survival of patients with WT. Additionally, we found that 6 DElncRNAs with potential prognostic value were correlated with tumor stage ( DENND5B-AS1) and histologic classification ( TMPO-AS1, RP3-523K23.2, RP11-598F7.3, LAMP5-AS1, and AC013275.2) of patients with WT. Our research provides a great insight into understanding the molecular mechanism underlying occurrence and progression of WT, as well as the potential to develop targeted therapies and prognostic biomarkers.
    Type of Medium: Online Resource
    ISSN: 1073-2748 , 1073-2748
    URL: Article
    DOI: 10.1177/1073274820936991
    Language: English
    Publisher: SAGE Publications
    Publication Date: 2020
    detail.hit.zdb_id: 2004182-2
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  • 9
    Online Resource
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    A Novel Viscosity-Based Model for Low Cycle Fatigue–Creep Life Prediction of High-Temperature Structures
    SAGE Publications ; 2012
    In:  International Journal of Damage Mechanics Vol. 21, No. 7 ( 2012-09), p. 1076-1099
    Details
    In: International Journal of Damage Mechanics, SAGE Publications, Vol. 21, No. 7 ( 2012-09), p. 1076-1099
    Abstract: Damage evolution during low cycle fatigue, creep, and their interaction behavior is actually a ductility exhaustion process in response to cyclic and static creep. In this article, a novel viscosity-based model for low cycle fatigue–creep life prediction is presented in an attempt to condition viscosity-based approaches for general use in isothermal and thermo-mechanical loading. In this model, it was assumed that only plastic and creep strains caused by tensile stress lead to ductility consumption under stress-controlled loading. Moreover, with its simple expression, the mechanisms of the loading waveform, temperature, and mean stress effects are taken into account within a low cycle fatigue–creep regime. Predicted fatigue lives using the proposed model were found to be in good agreement with reported experimental data from literature. Compared with the generalized strain energy damage function method, the mean strain rate, Smith–Watson–Topper and Goswami’s ductility models, the proposed model is widely applicable and more precise in the prediction of low cycle fatigue–creep life.
    Type of Medium: Online Resource
    ISSN: 1056-7895 , 1530-7921
    URL: Article
    DOI: 10.1177/1056789511432789
    Language: English
    Publisher: SAGE Publications
    Publication Date: 2012
    detail.hit.zdb_id: 2052623-4
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  • 10
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    Preparation and properties of the polyimide thin films reinforced by acylchloride-functionalized multiple-walled carbon nanotubes
    SAGE Publications ; 2013
    In:  Journal of Composite Materials Vol. 47, No. 24 ( 2013-11), p. 3041-3051
    Details
    In: Journal of Composite Materials, SAGE Publications, Vol. 47, No. 24 ( 2013-11), p. 3041-3051
    Abstract: A series of polyimide composites with various mass fractions of multi-walled carbon nanotubes (MWNTs) were prepared by in situ polymerization. To increase the chemical compatibility of carbon nanotubes with the polyimide matrix, MWNTs were treated with an acid mixture and sulfoxide chloride in turn. The modified MWNTs are dispersed homogeneously in the matrix while the structure of the PI and MWNTs are stable in the preparation process. The composite films hold preferable thermal stability the same as the pure PI. The composite films exhibited good thermomechanical properties. The storage modulus increased significantly by increasing MWNT content and decreasing the enhancement of temperature. The films’ glass transition temperature increased with enhancing of MWNTs frictions. The dielectric constants of the composites decrease with increasing frequency and increase sharply with the adding of MWNTs, which is favorable for practical use in anti-static materials and embedded capacitors.
    Type of Medium: Online Resource
    ISSN: 0021-9983 , 1530-793X
    URL: Article
    DOI: 10.1177/0021998312461822
    Language: English
    Publisher: SAGE Publications
    Publication Date: 2013
    detail.hit.zdb_id: 160490-9
    detail.hit.zdb_id: 2081924-9
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