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An efficient error concealment algorithm for H.264/AVC using regression modeling-based prediction
Xiaoming Chen,Yuk Ying Chung,Changseok Bae,Xiangjian He,Wei-Chang Yeh IEEE 2010 IEEE transactions on consumer electronics Vol.56 No.4
<P>This paper presents a novel error concealment algorithm for H.264/AVC based on a regression model, which is constructed according to the spatial relationship between block locations and their motion activities. With the proposed algorithm, a corrupted macroblock is partitioned into subblocks and the motion vector of each sub-block is predicted through the regression model with the help of the neighbor motion vectors. The experimental results show that the proposed algorithm can achieve significant Peak Signal Noise Ratio (PSNR) improvement over existing methods with even reduced complexity. The implementation of the proposed algorithm is very simple and therefore it can be readily applied to real-time video applications running on various consumer electronic products such as mobile devices.</P>
Xiaoming Gao,Kaixuan Xu,Hongbing He,Shouda Liu,Xiangbo Zhao 한국공업화학회 2022 Journal of Industrial and Engineering Chemistry Vol.111 No.-
Cu-d-Bi2O3 nanosheets with uniform thickness of approximately 2.7 nm and length about 200 nm forphotocatalytic nitrogen fixation and photocatalytic oxidation is achieved by simple hydrothermalmethod. The 2D ultrathin structure is benefit to the formation of the surface oxygen vacancies, meanwhilethe impurity defect is formed due to the substitutive Cu doping of d-Bi2O3. The as-prepared 5%Cu-d-Bi2O3 exhibits excellent NH4 + generation rate of 142.8 lmol h1 g1 without any sacrificial agentirradiated by visible light. The remarkable photocatalytic ability can be attributed to the ultrafast carrierstransfer from the interior to the surface because of 2D ultrathin structure feature, the separation ofelectrons-holes and molecular chemisorption due to the formation of surface oxygen vacancies andimpurity defect.
Computing Pore Size Distribution in Non-woven Fibrous Filter Media
He Bai,Xiaoming Qian,Jintu Fan,Yao Qian,Yongchao Duo,Yongsheng Liu,Xiaobo Wang 한국섬유공학회 2020 Fibers and polymers Vol.21 No.1
Fundamental understanding of transport properties of non-woven fibrous material is depended on in dept cognitionof their microstructure. Non-woven fibrous filter media are formed by the random distribution of fibers in a specific spaceexhibit a complicated pore size structure. Computing pore size distribution (PSD) is a vital parameter in studying materialtransport dynamics. In this work, a theoretical model was suggested based on the gamma distribution and fiber orientationdistribution to predict the PSD in non-woven fibrous filter media. In parallel, the analytical model was compared with theprevious PSD theories and experimental results. The 3D virtual fiber structure was constructed by using GeoDict code, andthe pore size was represented by the inscribed circle diameter. Parameters influencing the PSD were studied, including fiberdiameter, porosity, and fiber orientation. Comparison of simulation results with analytical model was made. The resultsdemonstrate that the angle between the fiber and the Z-axis has little effect on the PSD. When the porosity is consistent,smaller pores can be formed by reducing fiber diameter. With the fiber diameter is constant, larger pores can be formed byincreasing the porosity.
Min Wang,Xiaoming He,Biao Jiang,Wenrui Liu,Yu’e Lin,Dasen Xie,Zhaojun Liang,Lihui Chen,Qingwu Peng 한국식물생명공학회 2019 Plant biotechnology reports Vol.13 No.6
Drought, one of the crucial environmental constraints, seriously threats the quality and yield in chieh-qua. Therefore, cultivat-ing drought-tolerant variety is greatly necessary for its normal growth under water deficiency. However, at present, molecular knowledge on drought resistance is mostly unclear in chieh-qua. In the study, characteristics of two diverse genetic chieh-qua variety, A39 (drought-resistance) and H5 (drought-sensitivity), were analyzed. Under drought stress, H5 exerted high water loss rate, increased malonaldehyde (MDA) content, and decreased enzyme activity of glutathione peroxidase (GSH-PX) and superoxide dismutase (SOD) compared with A39. In addition, based on the transcriptome results, we obtained a total of 1821 (511 up-regulated and 1310 down-regulated) and 2114 (1282 up-regulated and 832 down- regulated) differentially expressed genes (DEGs) in the A39 versus H5 under normal and water-deficiency stress, respectively. Several DEGs involved in the cuticle synthesis (cytochrome P450 genes: CYP94A2, CYP86B1, CYP86A7), carbohydrate metabolism, and plant hormone signal transduction (small auxin-up RNA genes: SAUR32, SAUR72; JA-induced genes: TIFY 10A, TIFY 10C; ABA related genes: PYL2, PYL4) were explored and related to drought resistance. These expression patterns observed in the RNA-seq data were further confirmed with quantitative real-time PCR (qRT-PCR). In all, these results not only provided a new insight into analyzing genes of drought response, but also laid a foundation for isolating crucial genes involved in drought stress in chieh-qua.
Microwave Cavity with Controllable Temperature for In Vitro Hyperthermia Investigations
Asimina Kiourti,Mingrui Sun,Xiaoming He,John L. Volakis 한국전자파학회JEES 2014 Journal of Electromagnetic Engineering and Science Vol.14 No.3
Hyperthermia is a form of cancer treatment in which affected human tissue is exposed to >40℃ temperature. In this paper, our goal is to assess the efficacy of fullerene agents to reduce heating time for cancer treatment. Such agents can accelerate heating of cancer cells and improve hyperthermia treatment efficacy. Typically, in vitro testing involves cancer cell culturing, heating cell cultures in accordance to specifications, and recording cancer cell viability after hyperthermia. To heat cell cultures, we design and evaluate a 2.4-GHz microwave cavity with controllable temperature. The cavity is comprised of a polystyrene cell culture dish (diameter = 54 mm, height = 13.5 mm) and a printed monopole antenna placed within the cavity for microwave heating. The culture temperature can be controlled through the intensity and duration of the antenna’s microwave radiation. Heating experiments were carried out to validate the cavity’s performance for F-12K culture medium (Kaighn’s F-12K medium, ATCC). Importantly, fullerene agents were shown to reduce heating time and improve hyperthermia treatment efficacy. The culture medium temperature increased, on average, from 24.0℃ to 50.9℃ (without fullerene) and from 24.0℃ to 56.8℃ (with 3 mg/mL fullerene) within 15 minutes.
A review of the recent advances in design of corrugated plate packs applied for oil–water separation
Yunrui Han,Limin He,Xiaoming Luo,Yuling Lü,Kaiyue Shi,Jianheng Chen,Xin Huang 한국공업화학회 2017 Journal of Industrial and Engineering Chemistry Vol.53 No.-
The paper reviews the contradictions and problems existing on the oil–water separation technology in detail from the perspective of experiments, numerical simulation and coalescence mechanism analysis, and the future research directions are forecasted. The review points out that the law of droplet coalescence on the corrugated plates can be studied from the perspective of microscopic experiment and mechanism research, which are the theoretical bases for clarifying the coalescence mechanism of the corrugated plates and refining the droplet coalescence mathematical model. The further research topics are also clarified to promote future applications by combining the coalescence technology with surface bionic technology.
A Study on the Approach of the Structured Light Three-dimensional Measurement
Wang beiyi,,Yu xiaoyang,He baohua,Cai yingfu,Zhang jixun,Sun Xiaoming 보안공학연구지원센터 2015 International Journal of u- and e- Service, Scienc Vol.8 No.11
In order to establish the 3D Temperature Field based on structure light 3D measurement and cross-correlation registration. Infrared/Visible camera calibration method and heterologous images registration method were studied. First, according to infrared camera’s characteristics, the selection of calibration templates have been studied and the calibration of the infrared camera has been accomplished on the basis of planar calibration method; then, we simplified the two-step method based on the mature principle of structure light measurement; and the visible camera was calibrated; finally, use calibrated visible cameras to form structured light measurement system, and register the infrared image and visible image in the geometrical position. Experimental results show that: the relative error of measurement system is less than 0.3%;infrared and visible image’s alignment error in geometrical position is 0.0015 mm. and measurement systems have good reconstruction results for plane and curved ,and cross-correlation method has a good effect for heterrologous images registration.
Tang Haiyue,Zhang Wenjie,Yang Xiaoming,Wang Zujian,Su Rongbing,Liu Ying,Long Xifa,He Chao 한국물리학회 2023 Current Applied Physics Vol.55 No.-
The complete sets of material constants of <001>-oriented two wafers (HP: high-performance and LP: low-performance) using direct current poling (DCP) and alternating current poling (ACP) were investigated. ACP can improve the longitudinal and transverse piezoelectric properties (about 20% increase in both d31 and d33) and decrease the shear properties (about 40% decrease in d15). The compliance constants SEij of both ACP HP and LP samples have the similar change trend (the absolute of SE11, SE12, SE13, SE33, SE66 increasing, the SE44 decreasing), while most stiffness constants CEij of both ACP HP and LP samples show the different change trend. The values of CE11, CE12, CE13 of ACP LP samples increase by at least 50% while ACP HP samples decrease by about 5%. As temperature elevated, the dielectric properties (εT11/ε0, εT33/ε0), piezoelectric properties (d15, d31, d33) and electromechanical coupling coefficients (k15, k33) increased steadily, while the k31 keep stable.