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An Improved OSPF Routing Algorithm Based on Quotient and Granularity Space Theory
Qi Zhong 보안공학연구지원센터 2016 International Journal of Signal Processing, Image Vol.9 No.6
As the rapid increasing of Internet users from all over the world, it is necessary to enhance the reliability and compatibility of network when large number of data transferred frequently. One of the most important services is routing method since enormous data are transferred and exchanged within the network. This paper introduces an improved OSPF routing algorithm which uses the quotient and granularity space theory. Based on the simulation and experiments, several key findings are observed. Firstly, using the improved algorithm, the convergence time is much less than the no hierarchical network and the performance is better in terms of OSPF response. Secondly, it is found that the bandwidth utilization reaches 30Kbit/s, comparing with the network without hierarchy, the improvement is 40% that the bandwidth utilization increased from 18Kbit/s to 30 Kbit/s. The hierarchical network outperforms the one without layers.
Preparation and electrocatalytic oxidation performance of Pt/MnO2–graphene oxide nanocomposites
Qizhong Sun,박수진,김석 한국공업화학회 2015 Journal of Industrial and Engineering Chemistry Vol.26 No.-
A simple and eco-friendly approach was developed to prepare manganese dioxide functionalized reduced graphene oxide supported Pt nanocomposites (Pt/MnO2–RGO) via chemical reduction process. The morphology and structure of as-prepared catalysts were characterized by scanning electron microscopy (SEM), transmission electron microscopy (TEM), Fourier transform infrared spectra (FT-IR) and X-ray diffraction (XRD). Subsequently, electrochemical properties of catalysts were systematically investigated by cyclic voltammetry (CV). As a result, the ultrafine Pt nanoparticles with an average diameter of 2.9 nm were uniformly dispersed on the MnO2–RGO surface. The Pt/MnO2–RGO catalysts exhibited the superior electrochemical active surface area (79.4 m2 g1) and specific peak current density for methanol oxidation (24.7 mA cm2), compared to Pt/reduced graphene oxide (Pt/RGO) and Pt/carbon black (Pt/CB). The improved electrocatalytic activity was mainly attributed to the better dispersion of Pt nanoparticles as well as the synergistic effect of the modified supports.
Qizhong Yang,Tsunehiro Otsuki,Etsuyo Michida 한국국제경제학회 2020 International Economic Journal Vol.34 No.3
In the past decade, product-related environmental regulations (PRERs) aimed at environmental protection and consumers’ health and safety were actively introduced in developed countries, led by the EU. This study examined the impact of two PRERs released by the EU—RoHS and REACH—on Malaysian and Vietnamese firms’ compliance. The first analysis focuses on the R&D enhancement effect of PRERs. We then consider productivity as a realization of innovations and examine if the R&D enhanced by PRERs can promote further productivity. The result shows that the response to REACH can create incentives to advance R&D. Further estimations on the effect of inducedR&Don firm productivity show a significant positive relationship between them. On the other hand, no relationship between the response to RoHS and R&D expenditure is found. Moreover, the analysis also shows that firms comply with RoHS and REACH in different ways, but just the ability to continue exporting to the EU motivates compliance.
Jianxun Chen,Qizhong Huang 한국탄소학회 2006 Carbon Letters Vol.7 No.4
Carbon/Carbon composite was been manufactured by the technology of warmer-molding process of clutter chopped carbon fiber, using phenolic resin as an adhesive. The degree of graphitization, the microstructure and the friction properties were studied. The results show that the clutter chopped carbon fiber fully scatter in the Carbon/Carbon composite and the degree of graphitization of phenolic resin can reach up to 86.2%, this matrix carbon can form the continuous and stable graphitic thin film on the friction surface during braking process so that the composite has fine friction properties and low wear rate.
Jilin Hu,Qizhong Huang,Hongxia Peng,Xiuying Tian,Zhanjun Chen,Yangxi Peng 한양대학교 세라믹연구소 2018 Journal of Ceramic Processing Research Vol.19 No.3
Aluminium oxide (Al2O3)-aluminium nitride (AlN) composites were prepared at 1500-1600 oC by pressureless sintering. Themain raw materials used were AlN and Al2O3, and appropriate amounts of TiO2-Y2O3-CaO-La2O3 quaternary sintering aidswere added. The effects of different AlN contents and sintering temperatures on the bulk density, bending strength, Rockwellhardness, thermal conductivity, and other properties of Al2O3-based ceramics were studied. The phase composition andmicrostructure of the samples were analysed with an X-ray diffractometer and scanning electron microscope. Results showedthat the Al2O3-AlN composites had excellent overall performance in terms of a flexural strength of 295.7MPa, a Rockwellhardness of 61.5 HRA, and a thermal conductivity of 38.8W/(m·K) (at 25 oC) after pressureless sintering at 1600 oC for 3 hwith 10 wt% AlN content. These properties met the requirements of high-power ceramic LED lamp holders. The Al2O3-10 wt%AlN composites sintered at 1600 oC had a dense microstructure, tight bonding among grains, and few pores, whichexplained the excellent performance of the samples.
Effects of Additives on Nutrients and Fermentation Quality of Alfalfa Silage
Xiaoqing Zhang,Qizhong Sun,Xingyou Li,Xiaoxia Li 한국초지조사료학회 2009 한국초지조사료학회 학술대회논문집 Vol.2009 No.08
Two-year-old, full flower aohan alfalfa (Medicaga sativa cv. aohan) was chosen to evaluate the silage effect by using different additives of Qingbao Ⅱ , Caihe and Yishengkang. Result indicated that additives increased CP content (P<0.05) and decreased CF, ADF and NDF content significantly (P<0.05). Lactic acid content in additives treatments were significantly higher (P<0.01) than control. These result showed that additives improved silage fermentation quality, reduced cellulose contents and improved silage nutritive value. Among three treatments, Caihe and Yishengkang were priority to Qingbao Ⅱ on the effect of promoting the desired lactic acid fermentation.
The simultaneous photocatalytic degradation of phenol and reduction of Cr(VI) by TiO2/CNTs
Langhuan Huang,Qizhong Chan,Xiaojing Wu,Houjin Wang,Yingliang Liu 한국공업화학회 2012 Journal of Industrial and Engineering Chemistry Vol.18 No.1
The main objective of this paper is to verify the potential of TiO2/CNTs in the simultaneous photocatalytic degradation of phenol and reduction of Cr(VI). From the present results it can be concluded that there is a synergistic effect between the photocatalytic degradation of phenol and reduction of Cr(VI). Under all tested conditions, the degradation of phenol and reduction of Cr(VI) were examined to follow pseudofirst-order kinetic. The rate constant of 40 mg/L of Cr(VI) was evaluated as 4.34 103 min1 in the absence of phenol, and was increased up to 9.27 103 min1 by adding 10 mg/L of phenol, and to 10.73 103 min1 by adding 15 mg/L of phenol. The presence of Cr(VI) also accelerated the degradation process of phenol, with a factor of 1.84–3 times. Such a great synergistic effect was likely to be attributed to two kinds of effects from CNTs: adsorption effect and electron trap effect. The synergistic effect induced by CNTs was also confirmed by the detection of degradation intermediates of phenol.
Chen, Jianxun,Huang, Qizhong Korean Carbon Society 2006 Carbon Letters Vol.7 No.4
Carbon/Carbon composite was been manufactured by the technology of warmer-molding process of clutter chopped carbon fiber, using phenolic resin as an adhesive. The degree of graphitization, the microstructure and the friction properties were studied. The results show that the clutter chopped carbon fiber fully scatter in the Carbon/Carbon composite and the degree of graphitization of phenolic resin can reach up to 86.2%, this matrix carbon can form the continuous and stable graphitic thin film on the friction surface during braking process so that the composite has fine friction properties and low wear rate.
Haifeng Ding,Dongsheng Ma,Chunyan Yao,Qizhong Lin,Linhai Jing 한국지질과학협의회 2016 Geosciences Journal Vol.20 No.1
The Neoproterozoic successions in the Aksu region, NW China, which lies unconformably on the Precambrian Aksu Group basement, comprises the Qiaoenbrak, Yuermeinak, Sugetbrak, and Chigebrak formations (from bottom to top). The two lowermost units include two distinct glacial diamictites, which indicate distinct episodes of glaciations. We report the major and trace element (including rare earth element) data for the Qiaoenbrak, Yuermeinak, and Sugetbrak formations to identify the paleoclimatic perturbations. The chemical index of alteration (CIA) values show variations from Qiaoenbrak to Yuermeinak, then Sugetbrak formations. The diamictites have relatively lower chemical index of alteration values (45.23–59.64) than inter-, post- and non-glacial sediments (48.28–66.96). This result supported the condition that the diamictites underwent relatively weak chemical weathering from a dry-cold sedimentary environment, which is associated with the sedimentary facies description. The lower Neoproterozoic successions recoded at least two glaciations, one is Qiaoenbrak glaciation and the other is Yuermeinak glaciation.