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Comprehensive Evaluation of the Designing Scheme of Remote Students Practice Project by AHP Method
Xiaolong Chen 보안공학연구지원센터 2015 International Journal of u- and e- Service, Scienc Vol.8 No.12
We fully study the various factor indexes involved, use the AHP to build an integrated-assessed mathematic model of hierarchy of good distinct and structure of high efficiency and calculate the weight assessment indicator of each hierarchy. This paper uses AHP to build the general objective function of the designing scheme of students practice property. By the statistical analysis of the tip of various property indexes of mass property data, we choose the corresponding subordinating degree functions in the fuzzy mathematic field to determine the appropriate subjection function, calculate the relevant degree of membership, and finally conduct the integrated assessment of mathematic model of the design of remote students practice system. The paper uses C# language in the developing environment of VS2010 to develop the fuzzy-comprehensive-assessment software system of the designing scheme of students, and, we also use the software to analysis the systematic reliability of this scheme by living example. Through this work, we could offer a scientific and rational theory of technology to students for the support of remote Students practice projects research department.
Across-fault distributions of radon concentrations in soil gas for different tectonic environments
Xiaolong Sun,Pengtao Yang,Yang Xiang,Xueyun Si,Dongying Liu 한국지질과학협의회 2018 Geosciences Journal Vol.22 No.2
The radon concentration in soil gas at the crustal surface is closely related to the development of local fractures. Therefore, the spatial variation in soil-gas radon concentrations across faults differs between fault zones located in different tectonic environments. This study investigates the Beiluntai thrust fault and the Haiyuan strike-slip fault in west China, which are assumed to be typical examples of the different types of faults. Radon concentrations in soil gas were measured at various locations around these faults, and the spatial variation in these concentrations was characterized along fault-perpendicular profiles. For normal fault, our results indicate that concentrations are usually highest at the fault, and decrease gradually away from the fault in either direction. For thrust, however, concentrations increase in the hanging wall approaching the fault, but decrease sharply at the fault. For strike-slip fault with extension across the fault, soil-gas radon concentrations are relatively high at the fault, and decrease gradually with distance from the fault. For strike-slip fault with contraction across the fault, soil-gas radon concentrations are relatively low at the fault, and increase gradually with distance from the fault.
Changes in groundwater level and temperature induced by distant earthquakes
Xiaolong Sun,Yaowei Liu 한국지질과학협의회 2012 Geosciences Journal Vol.16 No.3
We analyzed the co-seismic responses of groundwater level and temperature in the Tayuan Well, Beijing, China, induced by 85 distant earthquakes over the period from January 2004 to July 2009. The results show that the Tayuan Well records earthquakes worldwide and that the co-seismic response shows the following pattern: water-level oscillation, temperature decrease, oscillations stop, return to normal temperature. The amplitudes of changes in water level and temperature are related to the earthquake magnitude and the distance to the epicenter. We discuss the mechanisms of the decrease in water temperature during the period of oscillations in water level, and the mechanisms of the temperature increase subsequent to the cessation of oscillations. We also analyze the results of previous studies on co-seismic response mechanisms, and consider the mechanisms of gas escape, heat diffusion, and cold-water seepage. These mechanisms may have induced the decrease in water temperature recorded in the present study, and the subsequent return to normal temperatures was due to heat exchange between the well water and the surrounding wall rock
Convergence theorems for inverse-strongly monotone mappings and quasi-Φ-nonexpansive mappings
Xiaolong Qin,강신민,조열제 대한수학회 2009 대한수학회보 Vol.46 No.5
In this paper, we consider a hybrid projection algorithm for a pair of inverse-strongly monotone mappings and a quasi-Φ-nonexpansive mapping. Strong convergence theorems are established in the framework of Banach spaces.
Xiaolong Qin,Yongfu Su,Meijuan Shang 대한수학회 2008 대한수학회지 Vol.45 No.1
In this paper, we introduce a modified three-step iteration scheme with errors for three classes of uniformly equi-continuous and asymptotically quasi-nonexpansive mappings in the framework of uniformly convex Banach spaces. We then use this scheme to approximate a common fixed point of these mappings. The results obtained in this paper extend and improve the recent ones announced by Khan, Fukhar-ud-di, Zhou, Cho, Noor and some others. In this paper, we introduce a modified three-step iteration scheme with errors for three classes of uniformly equi-continuous and asymptotically quasi-nonexpansive mappings in the framework of uniformly convex Banach spaces. We then use this scheme to approximate a common fixed point of these mappings. The results obtained in this paper extend and improve the recent ones announced by Khan, Fukhar-ud-di, Zhou, Cho, Noor and some others.
Modeling and Analysis for Output Impedance of Buck Converters
Xiaolong Yue,Shuhao Yang,Yin Chen,Fang Zhuo,Yunqing Pei 전력전자학회 2015 ICPE(ISPE)논문집 Vol.2015 No.6
In distributed power systems, the impedance model of power modules is very important because of the close relationship between impedance and stability. For buck converters with a sinusoidal current perturbation at the output terminal, the output voltage will contain multiple components in frequency domain. The output impedance characteristics of power converters are actually single input multiple output (SIMO). However, traditional models and modeling methods only take the perturbation frequency into account and ignore the other components. The obtained impedance models, with single input single output (SISO) forms, are actually simplifications of the real impedance. In this paper, the output impedance of buck converters with SIMO characteristics is modeled by a matrix based method. Detailed analysis shows that it is reasonable to only consider the perturbation frequency itself in low frequency regions, but in high frequency regions, especially those around the switching frequency and its multiples, the corresponding low frequency component is also very significant and should be taken into account. Simulation and experimental results validate the accuracy and effectiveness of the proposed modeling method and conclusions.
Xiaolong Huang,Huiqing Yan,Yanjing Liu,Yin Yi 한국유전학회 2020 Genes & Genomics Vol.42 No.6
Background LBDs, as the plant-specific gene family, play essential roles in lateral organ development, plant regeneration, as well as abiotic stress and pathogen response. However, the number and characteristic of LBD genes in Pyscomitrella patens were still obscure. Objective This study was performed to identify the LBD family gene in moss and to determine the expression profiles of LBDs under the abiotic and pathogen stress. Methods Complete genome sequences and transcriptomes of P. patens were downloaded from the Ensembl plant database. The hidden Markov model-based profile of the conserved LOB domain was submitted as a query to identify all potential LOB domain sequences with HMMER software. Expression profiles of PpLBDs were obtained based on the GEO public database and qRT-PCR analysis. Results In this study, a total of 31 LBDs were identified in the P. patens genome, divided into two classes based on the presence of the leucine zipper-like coiled-coil motif. A phylogenetic relationship was obtained between 31 proteins from P. patens and 43 proteins from the Arabidopsis thaliana genome, providing insights into their conserved and potential functions. Furthermore, the exon–intron organization of each PpLBD were analyzed. All PpLBD contain the conserved DNA binding motif (CX2CX6CX3C zinc finger-like motif), and were predicted to be located in cell nuclear. The 31 PpLBD genes were unevenly assigned to 18 out of 27 chromosomes based on the physical positions. Among these genes, PpLBD27 was not only remarkably highest expressed in desiccation, but also a susceptible gene to pathogens through jasmonic acid-mediated signaling pathway. Most of PpLBDs were up-regulated with the treatment of mannitol. These results showed they were differentially induced and their potential functions in the environmental stimulus of the early terrestrial colonizers. Conclusion Despite significant differences in the life cycle in P. patens and flowering plants, their functions involved in abiotic and biotic stress-regulated by LBDs have been identified and appear to be conserved in the two lineages. These results provided a comprehensive analysis of PpLBDs and paved insights into studies aimed at a better understanding of PpLBDs.
Prediction of tectonic fractures in coal reservoirs using geomechanical method
Xiaolong Fu,Junsheng Dai,Jianwei Feng 한국지질과학협의회 2018 Geosciences Journal Vol.22 No.4
Coalbed methane (CBM) resources are one of the most important and broadly developed unconventional resources. Considering the particularity of the coal, an adapted geomechanical method involving elastic-plastic deformation is badly needed to calculate the fracture parameters of the coal reservoir. Based on the rock mechanics experiments and three-dimensional μCT scan, the fracture evolution of coals can be summed up to initial compaction, propagation and coalescence stage. The microfractures will rapidly connect to each other when reaching 85% peak strength. Based on the plenty of measurement data, the relationship between fracture volume density and stress-strain of coals is established, and the acquisition of the quantitative geomechanical models made it possible to characterize fracture parameters after various tectonic movements under different stress state. Furtherly, the preparation of procedural language for the finite element (FE) simulation platform made it more popular and effective in the prediction of the generation of fractures and spatial distribution. The simulated results of No. 3 coal seam of Shizhuangbei area, both of the fracture density and direction, were in agreement with field observation results, which can be a compelling evidence for the effectiveness of the method.