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Hao Wang,Liang Wang,Wenfeng Shen,Ke Cao,Lei Sun,Pengju Wang,Liyun Cui 대한토목학회 2022 KSCE JOURNAL OF CIVIL ENGINEERING Vol.26 No.2
Recycled concrete powder (RCP) recycling can reduce the consumption of natural resources, which has been highlighted as an ecofriendly and sustainable approach. The alkali-activated slag (AAS) offers notable prospects for replacing conventional Portland cement binders. In this study, we partially replaced granulated blast furnace slag (GBFS) with RCP to prepare the AAS mortars. We evaluated the effect of RCP replacement levels and fineness levels on compressive strength, early hydration process, and pore structure pertaining to AAS mortars with RCP (RCP-AAS mortars). According to the experimental results, using 10 – 30% RCP inside AAS mortars enhanced the compressive strength at 1 day, and the improvement was obvious with increasing RCP fineness. The RCP delayed the early-age hydration of the GBFS, decreased the content of hydration products and increased the total porosity. Therefore, it exhibited a negative effect on 28-day compressive strength. These drawbacks of RCP, however, could be modified by increasing its fineness.
A Light-weighted Data Collection Method for DNS Simulation on the Cyber Range
( Shuang Li ),( Shasha Du ),( Wenfeng Huang ),( Siyu Liang ),( Jinxi Deng ),( Le Wang ),( Huiwu Huang ),( Xinhai Liao ),( Shen Su ) 한국인터넷정보학회 2020 KSII Transactions on Internet and Information Syst Vol.14 No.8
The method of DNS data collection is one of the most important parts of DNS simulation. DNS data contains a lot of information. When it comes to analyzing the DNS security issues by simulation on the cyber range with customized features, we only need some of them, such as IP address, domain name information, etc. Therefore, the data we need are supposed to be light-weighted and easy to manipulate. Many researchers have designed different schemes to obtain their datasets, such as LDplayer and Thales system. However, existing solutions consume excessive computational resources, which are not necessary for DNS security simulation. In this paper, we propose a light-weighted active data collection method to prepare the datasets for DNS simulation on cyber range. We evaluate the performance of the method and prove that it can collect DNS data in a short time and store the collected data at a lower storage cost. In addition, we give two examples to illustrate how our method can be used in a variety of applications.
Machining Error Inspection of T-Spline Surface by On- Machine Measurement
Jintao Lai,Jianzhong Fu,Hongyao Shen,Wenfeng Gan,Zichen Chen 한국정밀공학회 2015 International Journal of Precision Engineering and Vol. No.
A new method for machining error inspection of T-spline surface by on-machine measurement (OMM) is investigated in this study. With the presented method, a relatively small number of sampling points are needed to evaluate the machining error of the surface. The sampling strategy based on the dominant of the control vertex is proposed. Based on the inspection data, the machined surfacecan be obtained through a T-spline surface reconstruction algorithm. Verification experiments showed that the inspection errorbetween the OMM method and the coordinate measuring machine (CMM) method is within 13.3%. Simulation results shows that thefitting error in critical area can be improved with less additional sampling points while the surface is presented in T-spline surface.