Parallel Prefix Computation and Sorting on a Recursive Dual-Net

Li, Yamin,Peng, Shietung,Chu, Wanming Korea Information Processing Society 2011 Journal of information processing systems Vol.7 No.2

In this paper, we propose efficient algorithms for parallel prefix computation and sorting on a recursive dual-net. The recursive dual-net $RDN^k$(B) for k > 0 has $(2n_o)^{2K}/2$ nodes and $d_0$ + k links per node, where $n_0$ and $d_0$ are the number of nod es and the node-degree of the base-network B, respectively. Assume that each node holds one data item, the communication and computation time complexities of the algorithm for parallel prefix computation on $RDN^k$(B), k > 0, are $2^{k+1}-2+2^kT_{comm}(0)$ and $2^{k+1}-2+2^kT_{comp}(0)$, respectively, where $T_{comm}(0)$ and $T_{comp}(0)$ are the communication and computation time complexities of the algorithm for parallel prefix computation on the base-network B, respectively. The algorithm for parallel sorting on $RDN^k$(B) is restricted on B = $Q_m$ where $Q_m$ is an m-cube. Assume that each node holds a single data item, the sorting algorithm runs in $O((m2^k)^2)$ computation steps and $O((km2^k)^2)$ communication steps, respectively.

Effect of supplemental blue light intensity on the growth and quality of Chinese kale

Yamin Li,Yinjian Zheng,Houcheng Liu,Yiting Zhang,Yanwei Hao,Shiwei Song,Bingfu Lei 한국원예학회 2019 Horticulture, Environment, and Biotechnology Vol.60 No.1

The infl uence of blue light on the growth and quality of vegetables is controversial, since both positive and negative eff ectshave been observed on diff erent varieties of vegetables and most research has been conducted with a combination of lightspectrums. In this work, we investigated the eff ects of supplemental blue light intensity on growth, nutritional quality, andhealth-promoting compounds of Chinese kale ( Brassica alboglabra Bailey) using only blue (460 nm) light-emitting diodes10 days before harvest in a greenhouse under ambient light conditions. Four blue-light treatments were conducted (0, 50,100, and 150 μmol m −2 s −1 , named T0, T50, T100, and T150, respectively) with 12 h (6:00–18:00) of light treatment perday. The growth of Chinese kale plants was improved by supplemental blue light. The fresh and dry weights of Chinesekale plants were signifi cantly higher under T50 and T100 than those in the other treatments. The content of chlorophyll band total chlorophyll increased signifi cantly under T50, and the content of carotenoids increased signifi cantly under T150. The contents of soluble sugars and free amino acids were signifi cantly increased under the blue light treatments. The nitratecontent decreased with increasing blue light intensity, while the anthocyanin content increased. The contents of vitamin Cin T50 and total phenolic compounds in T150 were signifi cantly higher than in T0. The fl avonoid contents were signifi canthigher in T50 and T150, and signifi cantly lower in T100. Our results show that blue light can infl uence the growth and qualityof Chinese kale and 50 μmol m −2 s −1 of supplemental blue light might be the most feasible light intensity for Chinesekale production.

Multilayer-coated hydrogel membranes with comprehensive fouling resistance and stability for wastewater treatment

Yamin Li,Shengwei Sun 한국공업화학회 2022 Journal of Industrial and Engineering Chemistry Vol.114 No.-

Organic fouling was one of the most fatal weakness for membranes applied in water treatment. Aiming atovercoming the defect of liable to contamination and achieving efficient circulation and long-term stableoperation, it was reported a kind of multilayer-loaded hydrogels membranes with superior antifoulingproperty. Hydrogel coating mixture were coated onto PES substrate layer by layer and then crosslinkedby ambient free radical blending polymerization reaction endowing the membrane with interpenetratingnetwork structure and super hydrophilic surface. The FT-IR, FESEM, and AFM were used to characterthe structure and morphology of obtained membranes. Dynamic contact Angle, BET and membraneperformance evaluation instrument were used to evaluate the membrane performance. Compared withquantitative single layer-coated membrane, the four layers-coated hydrogel membrane exhibited moreexcellent and stable performance in terms of flux, rejection and fouling resistance. In particular, the waterflux of the four layers-coated hydrogel membrane increased by about 25%. When 0.5 g/L BSA was selectedas simulated protein contamination liquid, flux recovery rate (FRR) of four layers-coated hydrogel membraneswas up to 86.33%, indicating excellent long-term tolerance and resistance to proteins. It must bepointed out that four layers were the maximum loading number of the ambient self-crosslinking hydrogelCQAS casting solution within the limit air-cured time. On the whole, the multi-layer coated hydrogelmembranes showed practical application value in the field of water treatment.

Residual Shear Capacity of Reinforced Concrete Beams after Fire Exposure

Yamin Song,Chuanguo Fu,Shuting Liang,Dong Li,Longji Dang,Chongfang Sun,Weiyi Kong 대한토목학회 2020 KSCE Journal of Civil Engineering Vol.24 No.11

The mechanical properties of concrete and steel are seriously degraded under high temperature, so that reinforced concrete (RC) members after fire may not be able to satisfy the prescribed performance. In this study, 27 full-scale RC beams were carried out shear tests to investigate the shear behaviour after fire. A total of 20 beams were subjected to fire on three sides in accordance with ISO 834 standard fire curve, and the remaining 7 beams (which were not subjected to fire) were employed as a reference. The influences of fire time, stirrup ratio, shear span ratio, longitudinal reinforcement ratio, and preloading (40% loading level) were considered. The experimental results indicated that the shear failure mode of the RC specimens after fire exposure was similar to that of the reference specimens. Both the residual shear load bearing capacity and stiffness of the RC beams decreased after being subjected to fire. The loss of shear bearing capacity increased with the heating time. In addition, the ultimate load bearing capacity of specimens with stirrups subjected to the same fire exposure time decreased with an increasing shear span ratio.

Effect of activated persulfate on the properties of contaminated soil and degradation behavior of PAHs

Yamin Hong,Xiupeng Yue,Yaping Zhang,Kai Shen,Wentao Jiao,Lei Zhao,Beibei Li 대한환경공학회 2023 Environmental Engineering Research Vol.28 No.3

Sulfate radical-based advanced oxidation processes have been applied in the remediation of polycyclic aromatic hydrocarbons (PAHs) contaminated soil, during which sulfate can be activated in different ways. In this work, effects of four different ways (FeSO4, NaOH, H2O2, and Heat) activated sodium persulfate (PS) on PAHs removal and soil physicochemical properties (pH, organic matter, functional groups, surface morphology, and partial heavy metal elements) were compared, and the influencing factors and mechanism of soil PAHs removal by thermally activated PS were also studied. The results showed that at the dosage of 3% of persulfate, the removal efficiency of PAHs followed the sequences of Heat (91.4%) > FeSO4 (86.6%) > H2O2 (86.2%) > NaOH (72.9%). However, thermal activation decreased the soil pH and organic matter content more significantly than other treatments. The reaction tended to reach equilibrium at 6 h when the dosage of persulfate was 3% and the activation temperature was 60 °C, and the reaction obeyed pseudo-first-order kinetics. Through quenching experiments, it was found that the free radicals playing a dominant role in the oxidation process were sulfate radicals. Compared with pH, liquid to soil (L/S ratio) and the temperature had more significant impacts on the degradation efficiency of PAHs.

Biomass Chitosan-Induced Fe3O4 Functionalized Halloysite Nanotube Composites: Preparation, Characterization and Flame-Retardant Performance

Mengmeng Zhang,Yamin Cheng,Zhiwei Li,Xiaohong Li,Laigui Yu,Zhijun Zhang 성균관대학교(자연과학캠퍼스) 성균나노과학기술원 2019 NANO Vol.15 No.01

An inorganic–organic nanohybrid flame retardant, HNT@CS@Fe3O4, is prepared by Halloysite nanotubes (HNT) as nanotemplate, chitosan (CS) as char-forming agent and ferroferric oxide (Fe3O4) playing in a catalytic role, aiming to endow enhanced flame-retardant performance of its nanohybrid. Results show that HNT@CS@Fe3O4 nanohybrids have a corn-like structure and can significantly improve the flame retardancy and thermal stability of epoxy resin (EP). Especially, the initial thermal degradation temperature of EP/HNT@CS@Fe3O4 is significantly improved by 24 ℃ relative to pure EP, and the residual carbon yield under air atmosphere is 8.8 wt.%, which is significantly higher than other EP composites, indicating a higher thermal stability is offered by the as-prepared nanohybrid. The limiting oxygen index of EP/10HNT@CS@Fe3O4 is 31.3%, which is 10.2% higher than that of pure EP. Meanwhile, the HNT@CS@Fe3O4 nanofiller reduces the peak heat release rate, CO production and peak smoke production release of EP nanocomposite by 32.0%, 44.0% and 33.0% in a cone calorimeter test, respectively. This is because the HNT-based composite can form a three-dimensional network structure into the EP matrix to inhibit heat release and diffusion of flammable moieties upon burning of EP. In the meantime, the incorporated Fe3O4 nanoparticle can in situ catalyze the charring of CS and EP matrix on the surface of HNT during the combustion process, which also contributes to the significantly increased fire safety of EP.

Efficiency of gerAa, tupA and ca transformation in Bacillus subtilis for self-healing of concrete cracks

Hanxing He,Gefei Li,Jiantao Zhang,Jinlong Zhang,Mingyue Luo,Wenkai Hu,Yamin Lin,Ziyu Deng,Zhicheng Liu,Weizhao Chen,Xu Deng 한양대학교 세라믹연구소 2019 Journal of Ceramic Processing Research Vol.20 No.5

A genetic approach was proposed to modify the characteristics of Bacillus subtilis strain WB800 (B. subtilis WB800) for selfhealing of concrete cracks. Three genes, namely gerAa which encodes germination receptors activated by L-alanine, tupA which is responsible for the synthesis of teichuronopeptide, and ca which encodes carbonic anhydrase (CA) catalyzing the synthesis of carbonate ion, were separately transformed into WB800. To protect bacterial cells from being squeezed, microspheres were produced with microcrystal cellulose (MCC) before the introduction of bacteria into the specimens. The results showed that the modified B. subtilis expressing GerA achieved 39.9% of germination ratio compared to 17% by the original host cells. With the transformation of tupA, the modified strain demonstrated higher resistance to alkaline environments, tolerating pH as high as 11, while the original strain only tolerated pH 9. The modified strain expressing CA induced more calcium carbonate than the original cells. Energy dispersive spectroscopy (EDS) identified the produced precipitate to be calcite (CaCO3). Moreover, a mathematical model was developed to optimize the influential factors of calcium precipitation process. Finally, based on the above results, an effective self-healing of concrete crack was achieved. This study may provide a promising strategy to improve the efficiency of bacterial self-healing of concrete cracks.

Transverse vibration of the boring bar for BTA deep hole machining under stochastic excitation

Quanbin Zhang,Wu Zhao,Yamin Li,Shuangxi Jing 대한기계학회 2023 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.37 No.11

Taking the BTA deep hole boring bar as the object of axial flow and axial feed movement, the dynamic characteristics of the fluid-structure coupling boring bar are systematically studied. The influence of complex deformation (bending, torsion, tension, and compression) factors are considered in the derivation of dynamic characteristics. According to the force situation of the BTA deep hole boring bar, the transverse vibration equation of the BTA deep hole boring bar is established. The transverse vibration equation is discretized by Galerkin method, and then its characteristic root, response variance, and spectral density are solved to realize the transverse vibration analysis of the boring bar. Research has found that the correlation between system stability and boring bar speed is no longer monotonous. System stability is positively correlated with the equivalent stiffness and the equivalent shear modulus. There is a negative correlation between system stability and axial force, but it is not significant.

Interleukin-6 signaling regulates hematopoietic stem cell emergence

Ruxiu Tie,Honghu Li,Shuyang Cai,Zuyu Liang,Wei Shan,Binsheng Wang,Yamin Tan,Weiyan Zheng,He Huang 생화학분자생물학회 2019 Experimental and molecular medicine Vol.51 No.-

Hematopoietic stem cells (HSCs) produce all lineages of mature blood cells for the lifetime of an organism. Invertebrates, HSCs derive from the transition of the hemogenic endothelium (HE) in the floor of the embryonic dorsalaorta. Most recently, a series of proinflammatory factors, such as tumor necrosis factor-α, interferon-γ, and Toll-likereceptor 4, have been confirmed to play a key role in HSC specification. However, the full complement of necessarysignaling inputs remains unknown to date. Here, we show that interleukin-6R (IL6R) via IL6 is required and sufficient forHSC generation. We found that Notch activates IL6R by regulating its expression in the HE and in HSCs. The secretionof IL6 mainly originates from HSC-independent myeloid cells, but not from HSCs and their adjacent vascularendothelial cells. In addition, blocking IL6 signaling does not affect vascular development or the production ofprimitive erythrocytes. Taken together, our results uncover a previously obscure relationship between IL6 signaling andHSC production and provide new insights into HSC regeneration using proinflammatory factors in vitro.

Design and Characteristic Measurement of 8000 mm Large Aperture Integrating Sphere

Zhao Zhang,Zhi Wan,Xiansheng Li,Hongxing Liu,Jingxu Sun,Zexun Liu,Yamin Wang,Jianwei Ren,Jianyue Ren 한국광학회 2016 Current Optics and Photonics Vol.20 No.4

Integrating spheres play a central role in the radiometric calibration of remote sensors. With thedevelopment of the wide field of view (FOV) remote sensors, aperture diameters of remote sensors arebecoming larger and larger. To satisfy the radiometric calibration requirements of full FOV and fullaperture, an 8000mm diameter large aperture integrating sphere uniform source with a variable exit portwas designed and manufactured. This integrating sphere will be used for pre-launch test and radiometriccalibration of remote satellites. In this paper, optical theories were used to design the output spectralradiance. The LightTools software based on ray-tracing simulation method was used to determine the bestcombination and distribution of inner light sources. A spectral experiment was made to verify the spectralradiance design. To reduce the influence of longtime power-on, a new characteristic measurement methodwas developed to obtain the radiation characteristic of the integrating sphere, which could greatly improvethe measuring efficiency. This method could also be applied to measure other large aperture uniformsources. The obtained results indicate that the spatial uniformity is 98.35%, and the angular uniformityat center position is 98.78%.