On Finding the Multicast Protection Tree Considering SRLG in WDM Optical Networks

Yonggang Li,Yaohui Jin,Lemin Li,Longjiang Li 한국전자통신연구원 2006 ETRI Journal Vol.28 No.4

In this letter, a new sharing mechanism, SRLG sharing, is proposed, which allows the links of the same shared risk link group (SRLG) in a primary light tree to share protections in WDM optical networks. In previous studies, how to share spare resources with SRLG constraints has not been studied in multicast optical networks. In this letter, considering SRLG sharing, we propose a novel algorithm –multicast with SRLG sharing (MSS)– to establish a protection light tree. Finally, the algorithm MSS and the algorithm multicast with no SRLG sharing (MNSS) are compared through a simulation to show that our new sharing scheme of SRLG sharing is more efficient than that of no SRLG sharing in terms of spare resource utilization and blocking probability.

Synthesis Backbone-Dual-Responsive of Hyperbranched Poly(bis(N,N-ethyl acrylamide))s By RAFT

Yonggang Wu,Libin Bai,Guang Li,Wenliang Li,Sujuan Wang,Xinwu Ba,Guoqiang Zhou,Hongchi Zhao 한국고분자학회 2014 Macromolecular Research Vol.22 No.11

Hyperbranched poly(bis(N,N-ethyl acrylamide))s (HPNAMs) with many vinyls as terminal groups weresynthesized successfully using reversible addition fragmentation chain transfer polymerization (RAFT). Detailedanalyses, based on the molecular weight, α value, degree of branching (DB), and lower critical solution temperature (LCST)obtained from nuclear magnetic resonance (NMR), multi detector-size exclusion chromatography (MDSEC), ultravioletvisible(UV-vis) spectroscopy, and dynamic light scattering (DLS), indicate that we acquired backbone-temperatureand pH responsive HPNAM. Factors, such as DB, molecular weight, and pH value, that affect the LCST were investigated. It was found that the molecular weights of the hyperbranched polymers show significant influence on the LCSTs. For the HPNAMs with low molecular weight, the LCSTs decreased as the DB increased, and the LCSTs can also beadjusted by changing the pH value of solutions. Furthermore, the result of cell cytotoxicity indicates that this new dualresponsive hyperbranched polymer has low cytotoxicity and exhibits potential for biomedical applications.

Synthesis of mesoporous PrxZr1-xO2-δ solid solution with high thermal stability for catalytic soot oxidation

Hongcheng Li,Kongzhai Li,Xing Zhu,Yunpeng Du,Yonggang Wei,Kang Zhai,Hua Wang 한국공업화학회 2017 Journal of Industrial and Engineering Chemistry Vol.54 No.-

The fabrication of mesoporous PrxZr1xO2d solid solutions with different Pr/Zr molar ratios is reported in the present work. Based on a systematic investigation, the anion of Zr precursor and template species are found to play the most important roles for the formation of mesoporous structure. The triblock copolymer Pluronic F127 template helps to generate porosity in the matrix by self-assembly into micelle, while the additional Cl1 from Zr precursor can lead to the enhancement of the interaction between non-ionic micelles. The physicochemical properties of the obtained samples were studied by means of N2 sorption analysis, TEM, XRD, H2-TPR, O2-TPD and XPS technique. It is found that, compared with the nonmesoporous counterparts, the mesoporous PrxZr1xO2d solid solutions possess much higher specific surface area (139 m2 g1) and enhanced redox ability. Also, the ability to release oxygen is improved after aging at high temperature. For the catalytic soot oxidation, the fresh mesoporous Pr0.1Zr0.9O2d catalyst (calcinated at 500 C) shows high activity in a loose contact condition (T50 = 399 C). It should be highlighted that the T50 values over the three mesoporous PrxZr1xO2d samples decrease by 8–24 C after aging at 800 C for 3 h. This suggests that the mesoporous PrxZr1xO2d solid solution is an ideal candidate for catalytic application at high temperatures.

Zircon U-Pb geochronology, geochemistry, and Hf isotopic compositions of the trachyandesite in the Dong’an Au deposit, Lesser Xing’an Range, northeastern China

Gantian Li,Fengyue Sun,Bile Li,Yonggang Sun,Runtao Yu 한국지질과학협의회 2021 Geosciences Journal Vol.25 No.6

The Dong’an Au deposit is a large-sized epithermal Au deposit discovered in the Lesser Xing’an Range, Northeastern China. Intermediate–acid volcanic rocks (e.g., trachyandesite, andesite, dacite, rhyolite, and rhyolitic tuff) of the Lower Cretaceous Fuminghe Formation are the important surrounding rocks for Au mineralization in the Dong’an Au deposit. However, the relationship between the intermediate volcanic rocks and the acidic volcanic rocks is unclear. The authors present new geochemical, zircon U-Pb and Hf isotope data for the trachyandesites in the Dong’an Au deposit. The whole-rock geochemical data indicate that the trachyandesite samples are high-K calc-alkaline. They are enriched in LILEs (e.g., K, Rb, and Ba), LREEs, and incompatible elements (e.g., Th and U), but are depleted in HFSEs (e.g., Nb, Ta, P, and Ti), showing characteristics of volcanic arc magmas. They have low Mg# values (32.77–48.12), Cr, Ni, and Co contents. Zircons U-Pb dating of the trachyandesites from sample DA-N1 and DA-N2 yield weighted average ages of 108.0 ± 1.1 Ma (MSWD = 0.91) and 104.7 ± 4.3 Ma (MSWD = 17). In situ zircon Hf isotope analyses of the trachyandesites from sample DA-N1 and DA-N2 yield εHf(t) values of –3.2 – 1.2 and –2.3 – 2.6, and two-stage model age (TDM2) of 1372–1090 Ma and 1321–1009 Ma, respectively. These suggest the trachyandesite were derived from partial melting of the juvenile lower crust with involvement of the ancient crustal materials. Combined with previous geological and petrogeochemical characteristics of the Lower Cretaceous Fuminghe Formation volcanic rocks in the Dong’an Au deposit, the Fuminghe Formation volcanic rocks are believed to be comagmatic, and fractional crystallization played an important role in the differentiation of these volcanic rocks. They were likely formed during the retreat of the subducted Paleo-Pacific Plate.

Dirac semimetal-enabled multi-bit coding metasurface for dynamic manipulation of terahertz beams

Zhang Yonggang,Yin Kehao,Liang Lanju,Yao Haiyun,Yan Xin,Hu Xiaofei,Huang Chengcheng,Qiu Fu,Zhang Rui,Li Yuanping,Wang Yaru,Li Zhenhua,Wang Ziqun 한국물리학회 2024 Current Applied Physics Vol.58 No.-

In this study, a switchable multi-bit coding metasurface that is applied under a terahertz (THz) frequency by adjusting the Fermi level (EF) of Dirac semimetals (DSMs) is proposed. At a EF of 0.2 eV, a 1-bit coding metasurface can be applied in the 2.58–2.62 THz. At 0.3 eV, a 3-bit coding metasurface is realized at 1.88 THz, and at 0.05 eV, the phase of the coding units coincides in the 1.5–3 THz. So, different functions of the metasurface can be realized. The proposed coding metasurfaces has promising applications in terahertz communication.

Experimental Study and Analysis on Axial Compression Performance of High-Strength Recycled Concrete-Filled Steel Tube Column in Corrosive Environments

Cun Hui,Ke Li,Yonggang Li,Yadong Bian,Ran Hai,Chunqing Li 한국강구조학회 2022 International Journal of Steel Structures Vol.22 No.2

To explore the axial compression performance of high-strength recycled concrete-fi lled steel tube (RCFST) column in corrosive environments, ten high-strength RCFST columns with diff erent wall thicknesses of steel tube and corrosion degrees and two ordinary concrete-fi lled steel tube (CFST) columns were designed. Subsequently, an axial compression test was carried out on these specimens to obtain the load–displacement curve, skeleton curve, and rigidity degeneration curve. The stress process, failure morphology, characteristic load, and characteristic displacement were analyzed. According to the research fi ndings, the steel tube at the end of each specimen bulges. With increasing load, buckling occurs in the middle region, and the core concrete is crushed. The higher the corrosion degree of a specimen, the more obvious the buckling on its surface. The corrosion of a steel tube signifi cantly aff ects the initial stiff ness of high-strength RCFST column, which results in a signifi cant decline in its bearing capacity and stiff ness. An increase in the wall thickness of steel tubes can enhance the bearing capacity of a specimen. The ultimate balance theory was used to derive the calculation formula for the bearing capacity of each specimen, and the eff ects of diff erent lateral pressure coeffi cients on the results were compared and analyzed. Reasonable values were obtained by comparing with the experimental results. The software ABAQUS was used to establish a fi nite element numerical analysis model, and the damage deformation and load–displacement curves of each specimen were obtained. The analysis and comparison of the results obtained by the model and the obtained results verify the accuracy of the fi nite element analysis model.

Optimization for Scenedesmus obliquus Cultivation: the Effects of Temperature, Light Intensity and pH on Growth and Biochemical Composition

Yonggang Zhang,Li Ren,Hua-qiang Chu,Xue-fei Zhou,Tianming Yao,Ya-lei Zhang 한국미생물·생명공학회 2019 한국미생물·생명공학회지 Vol.47 No.4

Microalgae have been explored as potential host species for biofuel production. Environmental factors affect algal growth and cellular composition. The effects of several key environmental factors, such as temperature, light, and pH of the medium on the growth and biochemical composition of Scenedesmus obliquus were investigated in this study. The highest growth rate of microalgae was observed at an optimal temperature of 25℃, 150 μmol/(m2·s) light intensity, and pH 10.0. The biochemical composition analysis revealed that the carbohydrate content decreased at lower (20℃) or higher temperature (35℃), whereas the protein and lipid contents increase at these temperatures. The fluctuation of light intensity significantly affected the contents of protein, carbohydrate, and lipid. The protein levels varied greatly when the pH of the medium was below 7.0. The carbohydrate and lipid contents significantly increased at pH above 7.0.

Shaking table test and horizontal torsional vibration response analysis of column-supported vertical silo group silo structure

Li, Xuesen,Ding, Yonggang,Xu, Qikeng Techno-Press 2021 Advances in concrete construction Vol.12 No.5

Reinforced concrete vertical silos are universal structures that store large amounts of granular materials. Due to the asymmetric structure, heavy load, uneven storage material distribution, and the difference between the storage volume and the storage material bulk density, the corresponding earthquake is very complicated. Some scholars have proposed the calculation method of horizontal forces on reinforced concrete vertical silos under the action of earthquakes. Without considering the effect of torsional effect, this article aims to reveal the expansion factor of the silo group considering the torsional effect through experiments. Through two-way seismic simulation shaking table tests on reinforced concrete column-supported group silo structures, the basic dynamic characteristics of the structure under earthquake are obtained. Taking into account the torsional response, the structure has three types of storage: empty, half and full. A comprehensive analysis of the internal force conditions under the material conditions shows that: the different positions of the group bin model are different, the side bin displacement produces a displacement difference, and a torsional effect occurs; as the mass of the material increases, the structure's natural vibration frequency decreases and the damping ratio Increase; it shows that the storage material plays a role in reducing energy consumption of the model structure, and the contribution value is related to the stiffness difference in different directions of the model itself, providing data reference for other researchers; analyzing and calculating the model stiffness and calculating the internal force of the earthquake. As the horizontal side shift increases in the later period, the torsional effect of the group silo increases, and the shear force at the bottom of the column increases. It is recommended to consider the effect of the torsional effect, and the increase factor of the torsional effect is about 1.15. It can provide a reference for the structural safety design of column-supported silos.

A Combination of Baicalin and Berberine Hydrochloride Ameliorates Dextran Sulfate Sodium-Induced Colitis by Modulating Colon Gut Microbiota

Yonggang Yan,Luhan Li,Kenan Wu,Gang Zhang,Liang Peng,Yanni Liang,Zheng Wang 한국식품영양과학회 2022 Journal of medicinal food Vol.25 No.8

Baicalin and berberine hydrochloride are the main chemical compositions of Scutellariae Radix and Coptidis Rhizoma, respectively. S. Radix and C. Rhizoma are two traditional Chinese herbs that are commonly used together in compounded formulations to treat colitis. Therefore, the combination of Baicalin and berberine hydrochloride (BBH) to treat colitis was studied. The results of pharmacological evaluations demonstrated the excellent protective effects of BBH on colitis induced by dextran sulfate sodium (DSS). BBH could improve the morphological condition of colitis in mice and maintain the balance of proinflammation cytokines (IL-6, IL-8, IL-1β, and TNF-α) and anti-inflammation cytokines (IL-4 and IL-10). The 16s rDNA sequencing revealed that BBH was able to modulate the composition of intestinal microflora, especially the abundances of Eubacterium_brachy_group, Holdemania, Erysipelotrichaceae_UCG_003, Christensenellaceae_R-7_group, and Sellimonas. The results of PICRUSt indicated that the therapeutic effects of BBH were tightly connected with DNA synthesis, replication and repair of gut microbiota. In summary, it was concluded that BBH could protect mice against DSS-induced colitis, and the protective effects were tightly correlated with gut microbiota.

Fed-batch Cultivation of Escherichia coli YK537 (pAET-8) for Production of phoA Promoter-controlled Human Epidermal Growth Factor

Wang Yonggang,Du Peng,Gan Renbao,Li Zhimin,Ye Qin The Korean Society for Biotechnology and Bioengine 2005 Biotechnology and Bioprocess Engineering Vol.10 No.2

Secretion of the expressed heterologous proteins can reduce the stress to the host cells and is beneficial to their recovery and purification. In this study, fed-batch cultures of Escherichia coli YK537 (pAET-8) were conducted in a 5-L fermentor for the secretory production of human epidermal growth factor (hEGF) whose expression was under the control of alkaline phosphatase promoter. The effects of feeding of glucose and complex nitrogen sources on hEGF production were investigated. When the fed-batch culture was conducted in a chemically de-fined medium, the cell density was 9.68 g/L and the secreted hEGF was 44.7 mg/L in a period of 60 h. When a complex medium was used and glucose was added in pH-stat mode, the secreted hEGF was improved to 345 mg/L. When the culture was fed with glucose at a constant specific rate of $0.25\;gg^{-1}h^{-1}$, hEGF reached 514 mg/L. The effects of adding a solution containing yeast extract and tryptone were further studied. Different rate of the nitrogen source feeding resulted in different levels of phosphate and acetic acid formation, thus affected hEGF expression. At the optimal feeding rate, hEGF production achieved 686 mg/L.