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Trust Based Service Optimization Selection for Cloud Computing
Xiaohui Li,Jingsha He,Ying Du 보안공학연구지원센터 2015 International Journal of Multimedia and Ubiquitous Vol.10 No.5
We present an approach for privacy preservation in cloud computing environment in which we propose to use information entropy and rough set theory with the goal of personalized privacy protection in cloud users during service selection based on trust. In the approach, cloud server is as an active service provider to personalize the cloud user privacy, cloud user selects the service which is quantified by trust for multi-tenant personalized privacy protection needs. We descript user privacy information by the service and trust attributes, design a multi-attribute service quantization algorithm using information entropy and rough set theory for the quality of service. The approach can achieve the purpose of quantitative service and dynamically adjust the supply relationship service based on multi-attribute, analysis shows which can effectively protect user privacy and personalization by quantifying the cloud service.
Xiaohui Jiang,Kun Wu,Yong Zhang,Shirong He 한국정밀공학회 2022 International Journal of Precision Engineering and Vol.9 No.6
Milling vibration will greatly affect the milling accuracy and surface quality of thin-walled workpiece. Considering that the characteristics of instant curing high-efficiently under the action of magnetic field and can be recycled without wasted of magnetorheological fluid (MRF), a MRF composite clamping to suppress milling vibration is proposed in this paper. Based on the fluid–solid coupling dynamics theory, the dynamics modal of the MRF clamping is established. On this basis, considering the influences of the filling volume of MRF to processing vibration, the suppression effect of MRF on milling vibration is analyzed in time domain and frequency domain, respectively. A series of simulations and experiments are carried out on typical annular thin-walled workpiece, the result shows that the maximum increase of natural frequency of thin-walled workpiece is 53.1% while filling with MRF, and Ra, Rz, Rq decreased by 36.1%, 14.8% and 16.7%, respectively. The consequence verified the reliability and effectiveness of the proposed method in the whole milling process.
Zhao He,Hongchao Zhao,Jinliang Song,Xiaohui Guo,Zhanjun Liu,Yajuan Zhong,T. James Marrow 한국원자력학회 2022 Nuclear Engineering and Technology Vol.54 No.4
Green pitch coke with an average particle size of 2 mm was adopted as densifier and added to the rawmaterials of conventional A3-3 matrix graphite (MG) to prepare modified A3-3 matrix graphite (MMG)by the quasi-isostatic molding method. The structure, mechanical and thermal properties were assessed. Compared with MG, MMG had a more compact structure, and exhibited improved properties of highermechanical strength, higher thermal conductivity and better molten salt barrier performance. Notably,under the same infiltration pressure of 5 atm, the fluoride salt occupation of MMG was only 0.26 wt%,whereas it was 15.82 wt% for MG. The densification effect of green pitch coke endowed MMG withimproved properties for potential use in the spherical fuel elements of molten salt reactor.
Serra, Heï,di,Choi, Kyuha,Zhao, Xiaohui,Blackwell, Alexander R.,Kim, Juhyun,Henderson, Ian R. Public Library of Science 2018 PLoS genetics Vol.14 No.12
<▼1><P>During meiosis, chromosomes undergo DNA double-strand breaks (DSBs), which can be repaired using a homologous chromosome to produce crossovers. Meiotic recombination frequency is variable along chromosomes and tends to concentrate in narrow hotspots. We mapped crossover hotspots located in the <I>Arabidopsis thaliana RAC1</I> and <I>RPP13</I> disease resistance genes, using varying haplotypic combinations. We observed a negative non-linear relationship between interhomolog divergence and crossover frequency within the hotspots, consistent with polymorphism locally suppressing crossover repair of DSBs. The <I>fancm</I>, <I>recq4a recq4b</I>, <I>figl1</I> and <I>msh2</I> mutants, or lines with increased <I>HEI10</I> dosage, are known to show increased crossovers throughout the genome. Surprisingly, <I>RAC1</I> crossovers were either unchanged or decreased in these genetic backgrounds, showing that chromosome location and local chromatin environment are important for regulation of crossover activity. We employed deep sequencing of crossovers to examine recombination topology within <I>RAC1</I>, in wild type, <I>fancm</I>, <I>recq4a recq4b</I> and <I>fancm recq4a recq4b</I> backgrounds. The <I>RAC1</I> recombination landscape was broadly conserved in the anti-crossover mutants and showed a negative relationship with interhomolog divergence. However, crossovers at the <I>RAC1</I> 5′-end were relatively suppressed in <I>recq4a recq4b</I> backgrounds, further indicating that local context may influence recombination outcomes. Our results demonstrate the importance of interhomolog divergence in shaping recombination within plant disease resistance genes and crossover hotspots.</P></▼1><▼2><P><B>Author summary</B></P><P>Sexually reproducing plants and animals produce gametes with half the number of chromosomes, which can participate in fertilization. A specialized cell division called meiosis generates gametes, where the chromosomes are copied once and segregated twice. A further key feature of meiosis is that chromosomes physically pair and undergo reciprocal exchanges, called crossovers. Due to independent chromosome segregation and crossovers, meiosis creates gametes that are genetically diverse, which has a major effect on patterns of sequence variation in populations. Interestingly, the frequency of crossover is also highly variable along the lengths of chromosomes and tends to be concentrated in narrow hotspots. Here we studied two crossover hotspots in detail that are located within disease resistance genes, using the model plant Arabidopsis. We show that within these hotspots, greater levels of genetic difference between the recombining chromosomes locally inhibits crossover formation. We also show that hotspots within one of these resistance genes are surprisingly resistant to genetic backgrounds that increase crossovers elsewhere in the genome. This indicates that patterns of polymorphism and hotspot location along the chromosome are both important for control of recombination activity.</P></▼2>
Kim, YoungHee,He, XiaoHui,Ni, SiDao,Lim, Hobin,Park, Sun‐,Cheon Seismological Society 2017 Bulletin of the Seismological Society of America Vol.107 No.5
<P>Two earthquakes (M-w 5.1 and 5.5) ruptured branches of the Yangsan fault system in Gyeongju, South Korea, on 12 September 2016. Aftershocks, including a notable M-w 4.3 earthquake on 19 September 2016, were clustered around the epicenters of the first two events. The M-w 5.5 earthquake is considered the largest earthquake in South Korea to have occurred during the modern instrumental recording period since 1978. Although there is no apparent surface rupture, these earthquakes have greatly shaken South Korea, leaving both physical and societal impacts. In this study, we determine the source mechanism and rupture directivity using regional seismic-waveform data to understand the earthquake source processes. Based on the waveform inversion, we report that the mainshock (M-w 5.5 event) is a strike-slip event with two nodal planes 117 degrees/84 degrees/21 degrees and 24 degrees/69 degrees/173 degrees at a depth of 14 km. The inversion also demonstrates that the mainshock event ruptured against the 24 degrees seismogenic fault plane to the south-southwest, with a rupture length of similar to 4.3 km. This rupture propagation direction agrees well with the spatial distribution of relocated aftershock events and reported seismic intensities.</P>
Strain Rate Effects on the Mechanical Properties of an AlCoCrFeNi High-Entropy Alloy
Chuan Ting Wang,Yong He,Zhiping Guo,Xiaohui Huang,Ying Chen,Houan Zhang,Yuan He 대한금속·재료학회 2021 METALS AND MATERIALS International Vol.27 No.7
The efect of strain rate on the compressive properties of an AlCoCrFeNi high-entropy alloy (HEA) was investigated. Microstructure of the AlCoCrFeNi HEA was observed using scanning transmission microscopy (SEM) and transmission electronmicroscopy. The results showed formation of a homogeneous two-phase structure. Quasi-static compression was testedunder initial engineering strain rates between 10–4 and 10–2 s−1. Engineering compression stress of exceeding 2500 MPaand ductility of around 12% was achieved. Dynamic mechanical behavior at room temperature was characterized by a splitHopkinson pressure bar under strain rates between 1350 and 4000 s−1. The AlCoCrFeNi HEA exhibited high strain ratesensitivity, especially under dynamic compression. The fuctuation of yield strength and the variation of strain rate hardening with strain rate was investigated. The various parameters of a constitutive equation for deformation of the AlCoCrFeNiHEA were obtained from the experimental data. The constitutive equations can be applied to predict the strength of alloyunder various stain rates.
Cui, Suying,Zhao, Xiaohui,He, Xu,Gu, Haijun Optical Society of Korea 2018 Current Optics and Photonics Vol.2 No.6
In wave-front-sensor-less adaptive optics (WFS-less AO) systems, the Jacopo Antonello (JA) method belongs to the model-based class and requires few iterations to achieve acceptable distortion correction. However, this method needs a lot of measurements, especially when it deals with moderate or severe aberration, which is undesired in free-space optical communication (FSOC). On the contrary, the stochastic parallel gradient descent (SPGD) algorithm only requires three time measurements in each iteration, and is widely applied in WFS-less AO systems, even though plenty of iterations are necessary. For better and faster compensation, we propose a WFS-less hybrid approach, borrowing from the JA method to compensate for low-order wave front and from the SPGD algorithm to compensate for residual low-order wave front and high-order wave front. The correction results for this proposed method are provided by simulations to show its superior performance, through comparison of both the Strehl ratio and the convergence speed of the WFS-less hybrid approach to those of the JA method and SPGD algorithm.