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( Yuan Hong Zhong ),( Zhi Yong Huang ),( Bin Zhu ),( Hua Wu ) 한국정보처리학회 2015 Journal of information processing systems Vol.11 No.3
It is widely accepted that single carrier frequency division multiple access (SC-FDMA) is an excellent candidate for broadband wireless systems. Channel estimation is one of the key challenges in SC-FDMA, since accurate channel estimation can significantly improve equalization at the receiver and, consequently, enhance the communication performances. In this paper, we study the application of compressive sensing for sparse channel estimation in a SC-FDMA system. By skillfully designing pilots, their patterns, and taking advantages of the sparsity of the channel impulse response, the proposed system realizes channel estimation at a low cost. Simulation results show that it can achieve significantly improved performance in a frequency selective fading sparse channel with fewer pilots.
Zhong, Yuan-Hong,Huang, Zhi-Yong,Zhu, Bin,Wu, Hua Korea Information Processing Society 2015 Journal of information processing systems Vol.11 No.3
It is widely accepted that single carrier frequency division multiple access (SC-FDMA) is an excellent candidate for broadband wireless systems. Channel estimation is one of the key challenges in SC-FDMA, since accurate channel estimation can significantly improve equalization at the receiver and, consequently, enhance the communication performances. In this paper, we study the application of compressive sensing for sparse channel estimation in a SC-FDMA system. By skillfully designing pilots, their patterns, and taking advantages of the sparsity of the channel impulse response, the proposed system realizes channel estimation at a low cost. Simulation results show that it can achieve significantly improved performance in a frequency selective fading sparse channel with fewer pilots.
Hong-juan Zhang,Wei-guo Zhang,Zhi-yuan Wang,Yue-ping Zhan,Li-sheng Xu,Jun-zhong Liu,Qian Liu,Qing-cai Jiao 한국생물공학회 2013 Biotechnology and Bioprocess Engineering Vol.18 No.2
In order to investigate the catalytic mechanism of Escherichia coli γ-glutamyltranspeptidase, ten para- and meta- substituted γ-glutamyl anilides were chemically prepared and employed as substrates to synthesize L-theanine to assay the activity of γ-glutamyltranspeptidase. The reaction was optimized for γ-glutamyl-p-nitroanilide. Key factors such as substrate specificity, pH, temperature, and the substrate mole ratio were all investigated. Kinetic studies of the acyl transfer reaction were described and the Hammett plot was constructed. This study indicated that the ratelimiting acylation reaction of γ-glutamyltranspeptidase can apparently be accelerated by either the electron-withdrawing or electron-donating substituents of γ-glutamyl anilides. The reaction could be catalyzed by the general acid and carboxy of Asp-433 or phenolic hydroxyl Tyr-444 may be the acid by autodock simulation for all prepared γ-glutamyl anilides.
Hong-Yan Zhao,Wei Liu,Yi Wang,Nannan Dai,Jian-Hong Gu,Yan Yuan,Xue-Zhong Liu,Jian-Chun Bian,Zong-Ping Liu 대한수의학회 2015 Journal of Veterinary Science Vol.16 No.3
Exposure to cadmium (Cd) induces apoptosis in osteoblasts (OBs); however, little information is available regarding the specific mechanismsof Cd-induced primary rat OB apoptosis. In this study, Cd reduced cell viability, damaged cell membranes and induced apoptosis in OBs. We observed decreased mitochondrial transmembrane potentials, ultrastructure collapse, enhanced caspase-3 activity, and increasedconcentrations of cleaved PARP, cleaved caspase-9 and cleaved caspase-3 following Cd treatment. Cd also increased the phosphorylationof p38-mitogen-activated protein kinase (MAPK), extracellular signal-regulated kinases (ERK)1/2 and c-jun N-terminal kinase (JNK) in OBs. Pretreatment with the caspase inhibitor, N-benzyloxycarbonyl-Val-Ala-Asp-fluoromethylketone, ERK1/2 inhibitor (U0126), p38 inhibitor(SB203580) and JNK inhibitor (SP600125) abrogated Cd-induced cell apoptosis. Furthermore, Cd-treated OBs exhibited signs of oxidativestress protection, including increased antioxidant enzymes superoxide dismutase and glutathione reductase levels and decreased formationof reactive oxygen species. Taken together, the results of our study clarified that Cd has direct cytotoxic effects on OBs, which are mediatedby caspase- and MAPK pathways in Cd-induced apoptosis of OBs.
A case study on safety integrity level analysis for shale gas station
Yuan-Jian Yang,Chao Huang,Qiu-Yang Zhong,Hai-Jun Chen,Hong-Zhong Huang 대한기계학회 2021 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.35 No.12
Safety integrity level (SIL), as defined in IEC 61511, is a widely used safety performance measure for safety instrumented functions. Shale gas station is an important part of shale gas gathering and transportation system. To ensure the safety of its instrument system is of great significance to the safe and stable operation of the whole gathering and transportation system. This paper is motivated to conduct a case study on safety integrity analysis for shale gas station by using the layer of protection analysis method (LOPA). Firstly, the equipment under control (EUC) is identified. It is followed by the analysis of reaction reasons on safety instrumented function (SIF) from safety instrumented system (SIS). Finally, according to the identification of independent protection layer (IPL) and probability of failure on demand (PFD), the SIL analysis for every SIF is carried out. The result shows that the SIS of this shale gas station has reached the required of SIL and there is no need for further increase in SIS. Utilizing this method can accurately determine the reliability of the SIS in the station, and it can also be the reference of safe operation for this shale gas station.
Zhong-Ming Wang,Weidong Lu,Md Asraful Alam,Ying Pan,William Junior Nock,Zhen-Hong Yuan 한국화학공학회 2016 Korean Journal of Chemical Engineering Vol.33 No.9
The effects of extraction time, extraction temperature, solvent to biomass ratio and solvent composition on lipid yield from lyophilized Chlorococcum sp. biomass using a mixture of ethyl acetate and ethanol (EAE), a new proposed solvent, were studied. Subsequently, the process conditions of extraction by EAE were optimized using Box- Behnken design (BBD). The results revealed that the extraction temperature had the greatest effect on lipid extraction efficiency, followed by volume ratio of ethyl acetate to ethanol (EA/E) and extraction time. The largest lipid extraction yield of 15.74% was obtained under the following extraction conditions: 40mL solvents per gram of biomass for 270 min with gentle stirring at 80 oC by EAE with an EA/E of 1.0. Furthermore, palmitic acid, stearic acid, oleic acid, and linoleic acid were the most abundant fatty acids in the lipids extracted, indicating the great potential of the proposed lipid extraction procedure for microalgae-based biodiesel production.
Jian-Hong Gu,Xi-Shuai Tong,Guohong Chen,Xue-Zhong Liu,Jian-Chun Bian,Yan Yuan,Zong-Ping Liu 대한수의학회 2014 Journal of Veterinary Science Vol.15 No.1
To investigate 1α,25-(OH)2D3 regulation of matrixmetalloproteinase-9 (MMP-9) protein expression duringosteoclast formation and differentiation, receptor activator ofnuclear factor κB ligand (RANKL) and macrophagecolony-stimulating factor (M-CSF) were administered toinduce the differentiation of RAW264.7 cells into osteoclasts. The cells were incubated with different concentrations of1α,25-(OH)2D3 during culturing, and cell proliferation wasmeasured using the methylthiazol tetrazolium method. Osteoclast formation was confirmed using tartrate-resistantacid phosphatase (TRAP) staining and assessing bone lacunarresorption. MMP-9 protein expression levels were measuredwith Western blotting. We showed that 1α,25-(OH)2D3inhibited RAW264.7 cell proliferation induced by RANKLand M-CSF, increased the numbers of TRAP-positiveosteoclasts and their nuclei, enhanced osteoclast boneresorption, and promoted MMP-9 protein expression in aconcentration-dependent manner. These findings indicatethat 1α,25-(OH)2D3 administered at a physiological relevantconcentration promoted osteoclast formation and couldregulate osteoclast bone metabolism by increasing MMP-9protein expression during osteoclast differentiation.
Oscillation Criteria of Hyperbolic Equations with Continuous Deviating Arguments
Han, Zhong Yue,Yu, Yuan Hong Department of Mathematics 2007 Kyungpook mathematical journal Vol.47 No.3
In this paper, we shall consider a class of hyperbolic nonlinear differential equations with continuous deviating arguments. Some new sufficient conditions for oscillation of all solutions with two kinds of boundary conditions are obtained.
Privet golden leaves adapt unexpectedly well to light changes
Ming Yuan,Bo Huang,Li-Hua Dong,Qiao-Hong Han,Yong Yang,Chun-Bang Ding,Chao Hu,Yang-Er Chen,Zhong-Wei Zhang,Shu Yuan 한국원예학회 2020 Horticulture, Environment, and Biotechnology Vol.61 No.4
Golden-leaf privet ( Ligustrum × vicaryi ) is widely used as a horticultural shrub because of its upper golden leaves, butits lower leaves are green. However, the putative mechanisms of its upper golden leaves and the leaf color changes inresponse to light shifts have not been well studied so far. Here, chlorophylls (Chl), carotenoids, and Chl precursors from bothgolden and green leaves grown in full sunlight (approximately 1200 μmol photons m −2 s −1 at noon) or low-light conditions(180 μmol m −2 s −1 ) were determined spectrophotometrically. In addition, their gas exchange parameters and Chl fl uorescencewere measured in situ. Metabolic fl ux analysis of chlorophyll intermediates indicated that the conversion of prochlorophyllideto chlorophyllide was signifi cantly blocked in golden leaves when compared with green leaves. Green leaves showed higherphotosynthetic capacity in low light than golden leaves, but golden leaves presented unexpectedly stronger photosyntheticcapacity and lower reactive oxygen species accumulation under the high-light condition. Furthermore, golden leaves showeda higher level of nonphotochemical quenching (NPQ) after the light-to-dark shift and presented a stronger adaptive abilityto a broad range of light environments. Higher NPQ values and less oxidative damage in golden leaves may be correlatedwith their higher carotenoid levels. The results imply that lower chlorophyll levels and higher carotenoid levels in canopyleaves may help privet plants acclimate better to illumination changes. This study demonstrates the key role of irradiance ingenerating the two types of Ligustrum × vicaryi leaves and sheds a light on cultivation of other ornamental foliage plants.