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Intensity modulation-based fibre optic vibration sensor using an aperture within a proof mass
Zuo, Ze-Wei,Hao, Yi,Choi, Sang-Jin,Song, Minho,Kim, Young-Chon,Pan, Jae-Kyung IET 2017 IET science, measurement & technology Vol.11 No.1
<P>The authors propose an intensity modulation-based fibre optic vibration sensor (FOVS) using an aperture within a proof mass. It consists of an optical collimator, a mass-spring structure, a mirror, and a rectangular aperture. They verify its feasibility via experimental demonstration. For the feasibility test, they implement three lab-based prototype FOVSs with different natural frequencies and measure each FOVS's frequency response according to the base vibration and sensitivity. The experimental results for three lab-based prototype FOVSs show the sensitivities of 163, 183, and 206 mV/g, the minimum detectable accelerations of 0.082, 0.086, and 0.082 mg, and the dynamic ranges of 18-45, 26-52, and 20-120 Hz, respectively. They also experimentally demonstrate its remote sensing and multipoint sensing characteristics. The proposed FOVS has the virtues of easy controllable sensitivity and dynamic range, simple structure, and remote sensing and multipoint sensing characteristics.</P>
How does Freshippo subvert the traditional fresh food industry?
Xiru PAN,Haiting Wang,Man Hin Chan,Yuhe ZUO Academy of Asian Business (AAB) 2020 Academy of Asian Business Review Vol.6 No.2
This case study aims to analyze the development story of Freshippo, also named as Hema Fresh. It is an outstanding Chinese retail company owned by Alibaba and best known for its innovative new retail model driven by big data and advanced technology. The report is presented in four parts. Firstly, a detailed brand analysis of this newborn retail platform is conducted through market segmentation, positioning, and marketing strategies to present a clear band image of Freshippo. Then, the development timeline and three turning points during Freshippo’s expansion are highlighted. This part mainly focuses on how Freshippo designs and updates its business model to adapt to different market conditions. The third part looks into the success factors behind Freshippo’s achievement, including how it revolutes traditional retail models and maintains smooth development during the crisis. And based on the analysis of Freshippo’s current position, four challenges are put forward from internal and external aspects, followed by the recommended solutions. Finally, the valuable lessons of Freshippo’s success will be covered as the conclusion.
Antibacterial Chitosan Hybrid Films with N-halamine-Functionalized Graphene Oxide
Mengdi Zuo,Nengyu Pan,Tung-Shi Huang,Ick Soo Kim,Xuehong Ren 성균관대학교(자연과학캠퍼스) 성균나노과학기술원 2020 NANO Vol.15 No.03
Graphene, a single layer of two-dimensional carbon material, has attracted much attention due to its excellent comprehensive properties including high mechanical strength, antibacterial property, excellent thermal and electrical conductivities, high specific surface area, impermeability, etc. In this study, 3-epoxypropyl-5,5-dimethylhydantoin (GH), as a precursor of N-halamine, was synthesized and attached onto graphene oxide (GO) for enhanced antibacterial activity. The synthesized GO–GH was characterized by Fourier transform infrared spectroscopy (FT-IR), scanning electron microscopy (SEM), thermogravimetric analysis (TGA) and X-ray photoelectron spectroscopy (XPS). After chlorination treatment by house-hold bleach solution, the chlorinated graphene oxide-3-epoxypropyl-5,5-dimethyl hydantoin (GO–GH–Cl) possessed great antibacterial efficacy. The synthesized GO–GH–Cl was added to chitosan (CS) solution to produce GO–GH–Cl/CS hybrid films via a solution casting method. The as-prepared antimicrobial hybrid fllms showed excellent antibacterial activity and could kill 100% of S. aureus and 100% of E. coli O157:H7 within 10min and 30 min of contact time, respectively.
Xin Wang,Xin Zuo,Jianwei Liu,Huaqing Liang,Qi Pan 제어로봇시스템학회 2016 제어로봇시스템학회 국제학술대회 논문집 Vol.2016 No.10
This paper is concerned with the robust discrete-time control for uncertain time-delay systems with nonlinearities and external noises. The parameter uncertainties enter into all the system matrices. The time-varying delay is unknown with given lower and upper bounds. The stochastic nonlinearities are described by satisfying a class of α Hölder condition. The problem addressed is the analysis and design of a stable controller such that, for all the parameter uncertainties, time-delay, stochastic nonlinearities and external noises, the resulting closed-loop system is exponentially stabile. The controller gain can be got by linear matrix inequalities (LMIs). Numerical examples are given to illustrate the effectiveness and verify the proposed theoretical results.
Xiaogang Lu,Zhenghua Lin,Peng Pan,Yunbo Chen,Lingli Zuo,Chunming Li 한양대학교 세라믹연구소 2021 Journal of Ceramic Processing Research Vol.22 No.6
WC-10Co-4Cr have been well known material with attractive corrosion resistance and excellent hardness in the WC-basedcoatings. To widen the application of the WC-10Co-4Cr coatings deposited on high-hardness metal cutting tools, theinvestigation of its preparation parameters and properties are required. In this study, dense micro-structured WC-10Co-4Crcoatings deposited on high-hardness M42 steel were performed with high velocity oxy-fuel (HVOF) spray process. Theprepared coatings exhibit excellent properties by improving the size of spray gun and injecting high flow nitrogen into theflame stream. A maximum micro-hardness of 1353.3 HV0.3 was achieved. In addition, the frictional properties of uncoated M42steel and the WC-10Co-4Cr coating were comparably studied under dry sliding wear tests. A low friction coefficient of 0.34-0.37 was achieved for WC-10Co-4Cr coating, showing a 57% decrease than that of uncoated M42 steel. X-ray diffractometrywas used to identify the phase composition, and scanning electron microscopy was adopted to characterize the microstructureof deposited coatings and worn-out surfaces.
Hehan Tang,Na Hu,Yuan Yuan,Chunchao Xia,Xiumin Liu,Panli Zuo,Aurelien F. Stalder,Michaela Schmidt,Xiaoyue Zhou,Bin Song,Jiayu Sun 대한영상의학회 2019 Korean Journal of Radiology Vol.20 No.2
Objective: To compare the image quality of three-dimensional time-of-flight (TOF) magnetic resonance angiography (MRA) with sparse undersampling and iterative reconstruction (sparse TOF) with that of conventional TOF MRA. Materials and Methods: This study included 56 patients who had undergone sparse TOF MRA for intracranial artery evaluation on a 3T MR scanner. Conventional TOF MRA scans were also acquired from 29 patients with matched acquisition times and another 27 patients with matched scanning parameters. The image quality was scored using a five-point scale based on the delineation of arterial vessel segments, artifacts, overall vessel visualization, and overall image quality by two radiologists independently, and the data were analyzed using the non-parametric Wilcoxon signed-rank test. Contrast ratios (CRs) of vessels were compared using the paired t test. Interobserver agreement was calculated using the kappa test. Results: Compared with conventional TOF at the same spatial resolution, sparse TOF with an acceleration factor of 3.5 could reduce acquisition time by 40% and showed comparable image quality. In addition, when compared with conventional TOF with the same acquisition time, sparse TOF with an acceleration factor of 5 could also achieve higher spatial resolution, better delineation of vessel segments, fewer artifacts, higher image quality, and a higher CR (p < 0.05). Good-to-excellent interobserver agreement (к: 0.65–1.00) was obtained between the two radiologists. Conclusion: Compared with conventional TOF, sparse TOF can achieve equivalent image quality in a reduced duration. Furthermore, using the same acquisition time, sparse TOF could improve the delineation of vessels and decrease image artifacts.
Guo-Liang Wang,Shaohong Qu,Zhengjie Yuan,Yu Zhang,Guojuan Xu,Dongling Bi,Haiyan Qu,Xiaowei Zou,Xiaoqing Gao,Haihe Yang,Haiyan He,Xuli Wang,Jiandong Bao,Shimin Zuo,Xuebiao Pan,Bo Zhou 한국식물학회 2018 Journal of Plant Biology Vol.61 No.3
Rice sheath blight (SB), caused by Rhizoctoniasolani (R. solani), is a major threat to rice productionworldwide. The molecular mechanisms of the SB resistancein rice are poorly understood. The transcriptomes of the SBresistantrice cultivar YSBR1 and the susceptible cultivarLemont were analyzed after R. solani infection. A total of7624 differentially expressed genes (DEGs) were identifiedat one or more timepoints in a cultivar. 5526 and 5618 DEGswere differentially expressed in Lemont and YSBR1,respectively. YSBR1 exhibited stronger and earlier transcriptionalresponse to R. solani than Lemont. Gene ontology enrichmentanalysis revealed that genes that encode cell wall-modifyingand glycosyl-degrading enzymes or anti-microbial proteinswere specifically induced in YSBR1 at 6 hpi. MapMananalysis revealed that more DEGs related with cell wall, β-glucanses, respiratory burst, phenylpropanoids and ligninwere highly induced by R. solani in YSBR1 than in Lemont. The results also showed that receptor-like kinases and jasmonicacid signaling may play important roles in host resistance toR. solani. This study highlights potential candidate genes andsignaling pathways involved in rice sheath resistance and canhelp to further clarify the mechanistic events underlyingresistance and susceptibility to R. solani.