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Triaxial Shear Behavior of Basalt Fiber-Reinforced Loess Based on Digital Image Technology
Jian Xu,Zhipeng Wu,Hui Chen,Longtan Shao,Xiangang Zhou,Songhe Wang 대한토목학회 2021 KSCE Journal of Civil Engineering Vol.25 No.10
Engineering construction in loess areas often requires improvement of loess. Basalt fiber-reinforced soil due to complexity of material composition often exhibits poorly predictable mechanical behavior. In this study, digital image technology-based unconsolidated-undrained (UU) triaxial shear tests were carried out on loess samples at three fiber lengths (L) and four fiber contents (η). Results prove the improvement of the shear strength of loess by basalt fiber inclusion, which varies in inverted u-shaped pattern with fiber length or fiber content, with the maximum at η = 0.6%, L = 12 mm. Digital Image Technology was employed to analyze the damage characteristics and strain field of the surface of the sample at different loading time. The volumetric strain of the reinforced sample decreases at higher fiber content or fiber length, from shear contraction to dilatancy. The unreinforced sample exhibits a typical brittle failure mode with visible shear band, while plastic failure for reinforced samples with an overall bulging failure mode. A statistical damage constitutive model of fiber-reinforced loess was established with limited parameters calibrated. The rationality of the model was verified by comparisons of measured and calculated stress-strain data.
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Wang Chen,Ma Yuanyuan,Shao Zhipeng,Huang Xiuli,Fei Jiaxuan 보안공학연구지원센터 2016 International Journal of Multimedia and Ubiquitous Vol.11 No.10
With the development of power industry, communication security has become an important issue affecting the stability of power system. IEC 62351 standard provides security for substation communication system. However, different transmission protocols may lead to different manufacturers to produce different understanding, manufacturing is not compatible with the device. In order to avoid such a situation, the Finite State Machine (FSM) theory is used to model and analyze the transmission protocol of IEC 62351 standard. In this paper, the FSM model is simulated by the StateFlow tool, and it can be considered that the FSM theory is applicable to the analysis of compliance with IEC 62351 standard.
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A Source Code Cross-site Scripting Vulnerability Detection Method
Mu Chen,Lu Chen,Zhipeng Shao,Zaojian Dai,Nige Li,Xingjie Huang,Qian Dang,Xinjian Zhao 한국인터넷정보학회 2023 KSII Transactions on Internet and Information Syst Vol.17 No.6
To deal with the potential XSS vulnerabilities in the source code of the power communication network, an XSS vulnerability detection method combining the static analysis method with the dynamic testing method is proposed. The static analysis method aims to analyze the structure and content of the source code. We construct a set of feature expressions to match malignant content and set a "variable conversion" method to analyze the data flow of the code that implements interactive functions. The static analysis method explores the vulnerabilities existing in the source code structure and code content. Dynamic testing aims to simulate network attacks to reflect whether there are vulnerabilities in web pages. We construct many attack vectors and implemented the test in the Selenium tool. Due to the combination of the two analysis methods, XSS vulnerability discovery research could be conducted from two aspects: “white-box testing” and “black-box testing”. Tests show that this method can effectively detect XSS vulnerabilities in the source code of the power communication network.
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( Feifei Song ),( Yunfeng Lin ),( Chen Chen ),( Ensi Shao ),( Xiong Guan ),( Zhipeng Huang ) 한국미생물 · 생명공학회 2016 Journal of microbiology and biotechnology Vol.26 No.10
Vegetative insecticidal proteins (Vips) are insecticidal proteins synthesized by Bacillus thuringiensis during the vegetative stage of growth. In this study, Vip3Aa protein, obtained by in vitro expression of the vip3Aa gene from B. thuringiensis WB5, displayed high insecticidal activity against Spodoptera litura aside from Spodoptera exigua and Helicoverpa armigera. Bioassay results showed that the toxicity of Vip3Aa protein against S. litura larvae statistically decreased along with the increase of the age of the larvae, with LC<sub>50</sub> = 2.609 ng/cm² for neonatal larvae, LC<sub>50</sub> = 28.778 ng/cm² for first instar larvae, LC<sub>50</sub> = 70.460 ng/cm² for second instar larvae, and LC<sub>50</sub> = 200.627 ng/cm² for third instar larvae. The accumulative mortality of 100% larvae appeared at 72 h for all instars of S. litura larvae, when feeding respectively with 83.22, 213.04, 341.40, and 613.20 ng/cm² of Vip3Aa toxin to the neonatal and first to third instar larvae. The histopathological effects of Vip3Aa toxin on the midgut epithelial cells of S. litura larvae was also investigated. The TEM observations showed wide damage of the epithelial cell in the midgut of S. litura larvae fed with Vip3Aa toxin.
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