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Yulong Li,Tao Wang,Xinyi Song,Guijun Li 대한토목학회 2016 KSCE JOURNAL OF CIVIL ENGINEERING Vol.20 No.1
Terrorist attacks on infrastructures are serious incidents in many countries. Measures to prevent terrorist attacks and minimize the damage are critical in the design of infrastructures. This paper develops an Analytic Hierarchy Process (AHP) based risk assessment model to identify the key components of the overpass bridge in terrorist attacks, and prioritizes a variety of possible attack means with multiple criteria. The AHP risk assessment model can be used to not only set the priority of protected components, but also to allocate resources to the most critical protecting methods within a limited budget. An interchange overpass bridge in Beijing, China is analysed to validate the model. The results show that the method is suitable for the optimal resource allocation in the process of the overpass bridge anti-terrorism design, the formulation of a defence strategy and the protection resource allocation scheme for the overpass bridge against a terrorist attack. The method can also be used for dynamic allocating the resources for the overpass bridge under the early warning of terrorist attacks.
( Shan Li ),( Guijun Fei ),( Xiucai Fang ),( Xilin Yang ),( Xiaohong Sun ),( Jiaming Qian ),( Jackie D Wood ),( Meiyun Ke ) 대한소화기기능성질환·운동학회 2016 Journal of Neurogastroenterology and Motility (JNM Vol.22 No.2
Background/Aims Physical and/or emotional stresses are important factors in the exacerbation of symptoms in irritable bowel syndrome (IBS). Several lines of evidence support that a major impact of stress on the gastrointestinal tract occurs via the enteric nervous system. We aimed to evaluate histological changes in the submucosal plexus (SMP) and myenteric plexus (MP) of the distal ileum in concert with the intestinal motor function in a rat model of IBS with diarrhea. Methods The rat model was induced by heterotypic chronic and acute stress (CAS). The intestinal transit was measured by administering powdered carbon by gastric gavage. Double immunohistochemical fluorescence staining with whole-mount preparations of SMP and MP of enteric nervous system was used to assess changes in expression of choline acetyltransferase, vasoactive intestinal peptide, or nitric oxide synthase in relation to the pan neuronal marker, anti-Hu. Results The intestinal transit ratio increased significantly from control values of 50.8% to 60.6% in the CAS group. The numbers of enteric ganglia and neurons in the SMP were increased in the CAS group. The proportions of choline acetyltransferase- and vasoactive intestinal peptide-immunoreactive neurons in the SMP were increased (82.1 ± 4.3% vs. 76.0 ± 5.0%, P = 0.021; 40.5 ± 5.9% vs 28.9 ± 3.7%, P = 0.001), while nitric oxide synthase-immunoreactive neurons in the MP were decreased compared with controls (23.3 ± 4.5% vs 32.4 ± 4.5%, P = 0.002). Conclusions These morphological changes in enteric neurons to CAS might contribute to the dysfunction in motility and secretion in IBS with diarrhea. (J Neurogastroenterol Motil 2016;22:310-320)
ON n-HYPONOHRMALITY FOR BACKWARD EXTENSIONS OF BERGMAN WEIGHTED SHIFTS
DONG, YANWU,ZHENG, GUIJUN,LI, CHUNJI The Korean Society for Computational and Applied M 2021 Journal of applied mathematics & informatics Vol.39 No.3
In this paper, we discuss the backward extensions of Bergman shifts W<sub>α(m)</sub>, where $${\alpha}(m)\;:\;\sqrt{\frac{m}{m+1}},\;{\sqrt{\frac{m+1}{m+2}}},\;{\cdots},\;(m{\in}\mathbb{N})$$. We obtained a complete description of the n-hynonormality for backward one, two and three step extensions.
Wu, Jingyu,Lan, Chengming,Xian, Guijun,Li, Hui Techno-Press 2018 Smart Structures and Systems, An International Jou Vol.21 No.4
Carbon fiber reinforced polymer (CFRP) cable has good mechanical properties and corrosion resistance. However, the anchorage of CFRP cable is a big issue due to the anisotropic property of CFRP material. In this article, a high-efficient bonding anchorage with novel configuration is developed for CFRP cables. The acoustic emission (AE) technique is employed to evaluate the performance of anchorage in the fatigue test and post-fatigue ultimate bearing capacity test. The obtained AE signals are analyzed by using a combination of unsupervised K-means clustering and supervised K-nearest neighbor classification (K-NN) for quantifying the performance of the anchorage and damage evolutions. An AE feature vector (including both frequency and energy characteristics of AE signal) for clustering analysis is proposed and the under-sampling approaches are employed to regress the influence of the imbalanced classes distribution in AE dataset for improving clustering quality. The results indicate that four classes exist in AE dataset, which correspond to the shear deformation of potting compound, matrix cracking, fiber-matrix debonding and fiber fracture in CFRP bars. The AE intensity released by the deformation of potting compound is very slight during the whole loading process and no obvious premature damage observed in CFRP bars aroused by anchorage effect at relative low stress level, indicating the anchorage configuration in this study is reliable.