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All Zero Block Detection of Transform Coefficients in HEVC
Nana Shan,Yonghai Wang ASCONS 2022 INTERNATIONAL JOURNAL OF EMERGING MULTIDISCIPLINAR Vol.6 No.1
Background/Objectives: During the transform and quantization process in HEVC, there are a lot of zero blocks. The coding time of transform and quantization can be considerably decreased by effectively detecting all zero blocks. Methods/Statistical analysis: This work proposes all uniform quantizer and RDO quantizer zero block detection techniques. Findings: The energy concentration property of DCT is used to suggest an improved transform coefficient estimate approach. Low frequency DCT coefficients are estimated using the Hadamard transform, while the maximum magnitude of high frequency DCT coefficients is estimated using a SATD-based technique. There will be an explicit threshold which can be used to compare the float quantization level of coefficients, and all zero blocks in the uniform quantizer may be effectively found. The stair-like thresholds for RDOQ are obtained through statistical analysis, which makes AZB identification easier. Improvements/Applications: The experimental result shows that uniform quantizer’s coding time can be cut in half, and 40% coding time can be reduced for RDOQ.
Minjia Meng,Yonghai Feng,Weisheng Guan,Yan Liu,Yanfang Xi,Yongsheng Yan 한국공업화학회 2014 Journal of Industrial and Engineering Chemistry Vol.20 No.6
Highly effective molecularly imprinted nano-polymer on wollastonite (nano-WMIP) was prepared byimprinting technique using oil-in-water emulsion polymerization in the presence of salicylic acid (SA) astemplate. The adsorption behavior of nano-WMIP including adsorption kinetic, isotherms, selectiveadsorption, recognition, and effects of initial pH, ionic strength, initial concentration, adsorptiontemperature, and amount of adsorbents were investigated in detail. Moreover, the selective recognitionof nano-WMIP was further investigated by HPLC toward analogs of SA. The relative selectivitycoefficients for p-HB, MS, and MP were 113.4, 8.049, and 6.239, respectively, showing that much higherselectivity of SA on nano-WMIP was obtained than that of wollastonite-based non-imprinted polymer(nano-WNIP).
Linli Hou,Yonghai Song,Fengxiang Lang,Zhenrong Wang,Li Wang 한국공업화학회 2020 Journal of Industrial and Engineering Chemistry Vol.90 No.-
A luminescent Tb3+-pyromellitic acid (H4L = pyromellitic acid) coordination polymer (Tb-H4L CP, TbL0.5(H2L)0.5(H2O)DMF) was prepared for multiresponsive fluorescence sensor. The Tb-H4L CP exhibits uniform nanospheres with average diameter of 220 20 nm, good crystalline structure, and good dispersion in water. The Tb-H4L CP emitted the characteristic green fluorescence through antenna effect from H4L which was an excellent antenna molecule when excited at 270 nm and could be used to selectively determine Fe3+ and polychlorinated benzenes based on fluorescence quenching effect. The coordination between Fe3+ and carboxylic oxygen of Tb-H4L to damage the antenna effect and polychlorinated benzenes absorb the excitation light to result the inner-filter effect of fluorescence, which quenched the fluorescence of Tb-H4L CP. The linear range for Fe3+ was 2.0–100mM with a detection limit of 0.7mM and for 1,3,5-trichlorobenzene was 0–0.44 103 ppm with a detection limit of 0.087 ppm. The Tb-H4L CP demonstrates excellent fluorescence sensing performances, indicating that it can be used as a multi-response sensor to effectively measure toxic and harmful substances.
Linyu Wang,Yonghai Song,Ying Luo,Li Wang 한국공업화학회 2022 Journal of Industrial and Engineering Chemistry Vol.106 No.-
It is urgent to control serious drug pollution and heavy metal ion pollution. Covalent organic framework(COF) is becoming a promising material for the removal of heavy metal ion and adsorption of organicsmall molecule because of the designed functional sites, ordered pore channel, high specific surface areaand abundant p electrons. Herein, 2,4,6-triformylphloroglucinol (TFP) and benzene-1,3,5-tricarbohydrazide (BTH) was used to design a stable yet efficient beta-ketoenamine COF (COFTFP-BTH)adsorbent, which would provide multiple adsorption sites of Hg2+ by dense acylhydrazine. The maximumadsorption capacity of COFTFP-BTH toward Hg2+ achieved 909 mg g1, coinciding with Langmuir adsorptionand pseudo-second-order adsorption kinetic model, with the h value as high as 71.43 mg g1 min1. COFTFP-BTH was also grown on NH2-carbon nanotubes (CNT) to form a novel COFTFP-BTH@NH2-CNT compositefor sensitive detection of nitrofural (NF). The NF sensor based on COFTFP-BTH@NH2-CNT showed alow detection limit (3.2 nM) and a wide linear range (9.6 nM-100 lM). The excellent performances werealso attributed to the ordered channels of COFTFP-BTH exposing more adsorption sites of Hg2+ and NF, aswell as the good stability of beta-ketoenamine COFTFP-BTH.
Gas phase dehydration of glycerol catalyzed by rutile TiO_2-supported heteropolyacids
Lingqin Shen,Aili Wang,Hengbo Yin,Yonghai Feng,Longbao Yu,Tingshun Jiang,Yutang Shen,Zhanao Wu,박은덕 한국공업화학회 2011 Journal of Industrial and Engineering Chemistry Vol.17 No.3
Gas phase dehydration of glycerol catalyzed by the rutile TiO2-supported heteropolyacids was investigated. The TiO_2-supported heteropolyacid catalysts were prepared by the incipient wetness impregnation method using silicotungstic, phosphotungstic, and phosphomolybdic acids as active compounds. The as-prepared catalysts were characterized by X-ray diffraction, infrared spectroscopy,temperature programmed desorption of ammonia, and surface area measurement. The heteropolyacids supported by rutile TiO_2 were crystallites. The catalytic activity of the catalysts in the gas phase dehydration of glycerol was significantly affected by the type and loading of heteropolyacids. TiO_2-supported silicotungstic acid (20 wt.%) catalyst showed the highest catalytic activity with an acrolein selectivity of 80 mol% at a conversion of glycerol of 99% and a reaction temperature of 280 8C under ambient pressure. The possible reaction route in the gas phase dehydration of glycerol catalyzed by the TiO_2-supported heteropolyacid catalysts was also discussed briefly.
Jixin Wang,Jianhua Zhang,Yunlong Liang,Yonghai Yang 대한기계학회 2012 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.26 No.5
"The present paper focuses on the simulation of the non-stationary load histories of engineering vehicles for fatigue tests. For the first time, the characteristics of the service loads experienced by engineering vehicles are described. Then rainflow data-reduction contributing to reduce the testing time and extrapolation of each operating section to generate the unavailable extreme loads in a limit test are carried out. Finally, based on the simulated load history of each operating section using Markov chain Monte Carlo method (MCMC) and the corresponding simulation length generated by the Monte Carlo method, a cyclic simulation approach is proposed to generate nonstationary load histories, by which the cyclic characteristic can be reconstructed well. The results of comparison between the observed and simulated load histories show good agreement."