EKF-Based Fault Detection and Isolation for PMSM Driver Inverter

Dan-Luo,Sang Man Seong 제어로봇시스템학회 2014 제어로봇시스템학회 국제학술대회 논문집 Vol.2014 No.10

This paper deals with a new method PMSM driver inverter faults detection and isolation based on EKF (Extended Kalman Filter). Firstly, a nonlinear model of PMSM diver where the on resistance of inverter FET is included as state variable is derived. Secondly, the method to detect and isolate inverter fault from the estimated on resistance is presented. Finally, the usefulness of the proposed scheme is verified by simulation results.

DNA-based Materials

Dan LUO 한국생물공학회 2017 한국생물공학회 학술대회 Vol.2017 No.4

The Antibacterial Mechanism of Zn(II) Frame Supported on Alginate Membrane

Dan Luo,Ruo-Wei Lu,Cui-Juan Wang,Yan Tong,Cheng Liu,Yu-Mei Xiao,Yan-Xia Chen 대한화학회 2020 Bulletin of the Korean Chemical Society Vol.41 No.11

In order to solve the problem of antibiotic-resistant bacteria caused by excessive use of antibiotics, herein, an antibacterial membrane composed of natural sodium alginate (ALG), zeolite imidazolate skeleton (ZIF-8) and niflumic acid (NIF) was reported. The membrane serves as a versatile platform for local antibacterial. This report carried out in-depth research on the physical properties and antibacterial mechanism of the synthesized sodium alginate composite film. The data shows that the sodium alginate-based antibacterial film has a continuous antibacterial effect, and the release of antibacterial molecules can be controlled according to changes in the external environment. The results show that the complex has stronger mechanical and bacteriostatic properties. Niflumic acid and Zn(II) have synergistic antibacterial effect. The complex promotes bacterial death by hindering bacterial respiratory metabolism and destroying cell membrane structure.

Study of Oleophobic Modification of Fiber Material Surface and Its Performance

Dan Zhang,Chanjuan Huang,Wei Luo,Yuhe Wu,Zhu Long 한국섬유공학회 2019 Fibers and polymers Vol.20 No.6

In recent years, remarkable development and progresses have been made on the study of oleophobic modificationof fibers. Modified oleophobic fibers have broad application prospects not only owing to their important uses in daily life, butalso their extraordinary use in the fields of defense science and technology, and medical health care. In this study, fluorinecontainingacrylate (FP) emulsion was synthesized via emulsion polymerization method using perfluorooctyl acrylate(PFOA) as the fluorine-containing monomer, and butyl acrylate (BA) and styrene (St) as the basic monomers. In addition,SiO2 hydrosol was also prepared by water-based sol-gel reaction using tetraethyl orthosilicate (TEOS) as the precursor. Fourier transform infrared spectroscopy, scanning electron microscopy, atomic force microscopy, particle size analysis,thermogravimetric analysis and contact angle measurement were used to characterize the structural morphology and thermalstability of the FP polymer. The as-obtained FP and SiO2/FP were coated on cotton fabrics by the impregnation-curingmethod, successfully affording the cotton fabrics with oleophobic property. The application performance of the fabrics beforeand after finishing were measured and analyzed, and the effect of rubbing and soap washing on the oleophobic property of thefabrics were investigated. Then property changes, such as the anti-ultraviolet property, whiteness, breathability, and breakingstrength, of the fabrics before and after finishing were investigated. The results showed that the FP finishing agent exhibitedexcellent thermal property and satisfied the basic requirements for the fabrics finishing agents. The oleophobic property ofthe fabrics after FP emulsion finishing achieved grade 5, with no wettability to n-dodecane. The oleophobic property of theSiO2/FP treated fabrics was better than those of the FP treated fabrics, indicating that the roughen treatment of cotton fabricssurfaces using silica sol first and then coating with FP improved the oleophobic property. The combined actions of the coarsesurface structure provided by SiO2 nanoparticles and the low surface energy of the fluorine-containing polymers afforded thecotton fabric surfaces with oleophobic property. The treated fabrics retained good oleophobic performance after multipletimes of water washing and rubbings, and the physical mechanical properties of the cotton fabrics did not change muchbefore and after finishing, and thus did not affect the clothing performance of the cotton fabrics.

Microbial diversity in the rumen, reticulum, omasum, and abomasum of yak on a rapid fattening regime in an agro-pastoral transition zone

Dan Xue,Huai Chen,Xiaolin Luo,Jiuqiang Guan,Yixin He,Xinquan Zhao 한국미생물학회 2018 The journal of microbiology Vol.56 No.10

The ruminant digestive system harbors a complex gut microbiome, which is poorly understood in the case of the four stomach compartments of yak. High-throughput sequencing and quantitative PCR were used to analyse microbial communities in the rumen, reticulum, omasum, and abomasum of six domesticated yak. The diversity of prokaryotes was higher in reticulum and omasum than in rumen and abomasum. Bacteroidetes predominated in the four stomach compartments, with abundance gradually decreasing in the trend rumen > reticulum > omasum > abomasum. Microorganism composition was different among the four compartments, all of which contained high levels of bacteria, methanogens, protozoa and anaerobic fungi. Some prokaryotic genera were associated with volatile fatty acids and pH. This study provides the first insights into the microorganism composition of four stomach compartments in yak, and may provide a foundation for future studies in this area.

Strongly Consistent Identification for Stochastic Linear Errors-in-variables Systems

Dan Fan,Guiming Luo 제어로봇시스템학회 2011 제어로봇시스템학회 국제학술대회 논문집 Vol.2011 No.10

Since the practical systems are very complicated and the survey signals are disturbed, it is necessary to build anti-interference adaptive algorithms for disturbed systems modeling. Real-time errors-in-variables (EIV) systems, in which both the output and the input variables are disturbed by noises, are widely used in signal processing, communications, and control engineering. The adaptive modeling for stochastic linear EIV systems is considered in this paper. A recursive estimation algorithm is proposed for identifying both the system parameters and the noise variance. Then the convergence of the new algorithm is analyzed and the rate of convergence is obtained. It is shown that the parameter estimation can converge to their true values. Numerical simulations are included to illustrate the efficiency of the new algorithm.

Effect of Ultrasonic Surface Rolling on Dry Sliding Tribological Behavior of Ductile Iron Under Different Normal Loads

Xiaoshuang Luo,Haitao Duan,Jian Li,Shengpeng Zhan,Dan Jia,Jiesong Tu,Yinhua Li,Yaping Chen 대한금속·재료학회 2022 METALS AND MATERIALS International Vol.28 No.4

This study emphasizes the effect of ultrasonic surface rolling (USR) on the surface roughness, hardness, and tribologicalproperties of ductile iron under different normal loads. Results revealed that surface roughness was reduced by 96% andsurface hardness increased by 37.8% after USR treatment. By increasing normal load, the average friction coefficient of theUSR-treated specimens decreased, but the wear rate of both USR-treated and untreated specimens increased, mainly becausethe dominant wear mechanism changed. The average friction coefficient of the untreated specimen (~ 0.32) was much higherthan the USR-treated specimen (~ 0.24) when the normal load was 30 N. However, the wear rate of the USR-treated specimenwas larger than that of the untreated specimen when the normal load was greater than 20 N because the higher hardnessabrasive particles on the worn surface of the USR-treated specimen not only accelerated abrasive particle wear, but alsocaused more severe adhesive wear.

Mechanisms and Control Strategies of Antibiotic Resistance in Pathological Biofilms

( Ying Luo ),( Qianqian Yang ),( Dan Zhang ),( Wei Yan ) 한국미생물생명공학회(구 한국산업미생물학회) 2021 Journal of microbiology and biotechnology Vol.31 No.1

Bacterial biofilm is a community of bacteria that are embedded and structured in a self-secreted extracellular matrix. An important clinical-related characteristic of bacterial biofilms is that they are much more resistant to antimicrobial agents than the planktonic cells (up to 1,000 times), which is one of the main causes of antibiotic resistance in clinics. Therefore, infections caused by biofilms are notoriously difficult to eradicate, such as lung infection caused by Pseudomonas aeruginosa in cystic fibrosis patients. Understanding the resistance mechanisms of biofilms will provide direct insights into how we overcome such resistance. In this review, we summarize the characteristics of biofilms and chronic infections associated with bacterial biofilms. We examine the current understanding and research progress on the major mechanisms of antibiotic resistance in biofilms, including quorum sensing. We also discuss the potential strategies that may overcome biofilm-related antibiotic resistance, focusing on targeting biofilm EPSs, blocking quorum sensing signaling, and using recombinant phages.

Numerical simulation of droplet dynamic behaviors in a convergent microchannel

Ying Yan,Dan Guo,Jing Luo,Shizhu Wen 한국바이오칩학회 2013 BioChip Journal Vol.7 No.4

Microfluidic devices are of high efficiency for the coalescence and manipulation of monodispersed droplets. Numbers of microfluidic applications involve the control of droplets through networks of convergent or divergent junctions. The convergent microchannels are widely applied in transporting DNA and controlling other chemical and biological reactions. But there are still some problems unsolved such as that how to merge droplets more efficiently and how to guarantee the stability of the droplet in a convergent microchannel. In this work, numerical method is used to investigate the dynamic properties of the water microdroplets suspended in the convergent microchannel filled with oil. The moving of microdroplets in the convergent microchannel is driven by the initial droplet velocity. The surface tension is taken into account in the Navier-Stokes equations. The microchannel size parameter “Da” is firstly proposed to describe the convergent microchannel geometric characteristics and through which a regime map is created to classify droplets states into total coalescence regime, partial coalescence regime and no coalescence regime respectively. The dynamic behaviors of the droplets suspended in the convergent microchannel are discussed in detail. This work would contribute to the design of convergent microchannels for better biochemical analysis.

Four-year changes in central fatness, risk of diabetes, and metabolic control in older adults: a cohort study with mediation analysis

( Xue Cai ),( Dan Luo ),( Shuling Liu ),( Ruxue Li ),( Yanhui Lu ),( Mingzi Li ),( Shanhu Qiu ) 대한내과학회 2022 The Korean Journal of Internal Medicine Vol.37 No.1

Background/Aims: Older adults are vulnerable to central obesity, while the association of changes in central fatness with risk of diabetes and metabolic control has not been investigated among this particular population. This study was aimed to address these issues. Methods: A total of 1,815 adults aged ≥ 60 years without diabetes at baseline were followed for 4 years. Incident diabetes was ascertained based on plasma glucose, hemoglobin A1c, medical history, and/or the use of anti-diabetic drugs. Central fatness was assessed by waist circumference (WC), waist-height ratio (WHtR), and body roundness index (BRI). Logistic regression analyses were used to assess the association of changes in central fatness with risk of diabetes, along with dose-response and mediation analyses. Results: During the 4-year follow-up, 177 participants developed diabetes. The risk of diabetes was increased by 42%, 41%, and 40% per 1 standard deviation increases in WC, WHtR, and BRI, respectively, in multivariable-adjusted models (all p < 0.01). Moreover, these relationships were all linearly-shaped (all p_nonlinearity ≥ 0.11). Increases in WC, WHtR, and BRI correlated with increases in hemoglobin A1c, triglycerides-and-glucose index, triglycerides, white blood cell, and C-reactive protein (all p ≤ 0.04). Yet only changes in hemoglobin A1c and triglycerides-and-glucose index were identified as the possible mediators for risk of diabetes, with their mediating effect being about 35% and 21%, respectively. Conclusions: Increases in central fatness were related to elevated risk of diabetes, and this association might be partly explained by the worsening of glycemic control and insulin resistance in older adults.