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A Symmetric Lookup-based Secure P2P Routing Algorithm
( Bingqing Luo ),( Yiai Jin ),( Shengmei Luo ),( Zhixin Sun ) 한국인터넷정보학회 2016 KSII Transactions on Internet and Information Syst Vol.10 No.5
To prevent structured peer to peer (P2P) overlay networksfrom being attacked by malicious nodes, a symmetric lookup-based routing algorithm referred to as Symmetric-Chord is proposed in this paper. The proposed algorithm determines the precision of routing lookup by constructing multiple paths to the destination. The selective routing algorithm is used to acquire information on the neighbors of the root. Authenticity of the root is validated via consistency shown between the information ascertained from the neighbors and information from the yet-to-be-verified root, resulting in greater efficiency of resource lookup. Simulation results demonstrate that Symmetric-Chordhas the capability of detecting malicious nodes both accurately and efficiently, so as to identify which root holds the correct key, and provides an effective approach to the routing security for the P2P overlay network.
Design Methodology for Optimal Phase-Shift Modulation of Non-Inverting Buck-Boost Converters
Bingqing Shi,Zhengming Zhao,Kai Li,Gaohui Feng,Shiqi Ji,Jiayue Zhou 전력전자학회 2019 JOURNAL OF POWER ELECTRONICS Vol.19 No.5
The non-inverting buck-boost converter (NIBB) is a step-up and step-down DC-DC converter suitable for wide-input-voltagerange applications. However, when the input voltage is close to the output voltage, the NIBB needs to operate in the buck-boost mode, causing a significant efficiency reduction since all four switches operates in the PWM mode. Considering both the current stress limitation and the efficiency optimization, a novel design methodology for the optimal phase-shift modulation of a NIBB in the buck-boost mode is proposed in this paper. Since the four switches in the NIBB form two bridges, the shifted phase between the two bridges can serve as an extra degree of freedom for performance optimization. With general phase-shift modulation, the analytic current expressions for every duty ratio, shifted phase and input voltage are derived. Then with the two key factors in the NIBB, the converter efficiency and the switch current stress, taken into account, an objective function with constraints is derived. By optimizing the derived objective function over the full input voltage range, an offline design methodology for the optimal modulation scheme is proposed for efficiency optimization on the premise of current stress limitation. Finally, the designed optimal modulation scheme is implemented on a DSPs and the design methodology is verified with experimental results on a 300V-1.5kW NIBB prototype.
Design Methodology for Optimal Phase-Shift Modulation of Non-Inverting Buck-Boost Converters
Shi, Bingqing,Zhao, Zhengming,Li, Kai,Feng, Gaohui,Ji, Shiqi,Zhou, Jiayue The Korean Institute of Power Electronics 2019 JOURNAL OF POWER ELECTRONICS Vol.19 No.5
The non-inverting buck-boost converter (NIBB) is a step-up and step-down DC-DC converter suitable for wide-input-voltage-range applications. However, when the input voltage is close to the output voltage, the NIBB needs to operate in the buck-boost mode, causing a significant efficiency reduction since all four switches operates in the PWM mode. Considering both the current stress limitation and the efficiency optimization, a novel design methodology for the optimal phase-shift modulation of a NIBB in the buck-boost mode is proposed in this paper. Since the four switches in the NIBB form two bridges, the shifted phase between the two bridges can serve as an extra degree of freedom for performance optimization. With general phase-shift modulation, the analytic current expressions for every duty ratio, shifted phase and input voltage are derived. Then with the two key factors in the NIBB, the converter efficiency and the switch current stress, taken into account, an objective function with constraints is derived. By optimizing the derived objective function over the full input voltage range, an offline design methodology for the optimal modulation scheme is proposed for efficiency optimization on the premise of current stress limitation. Finally, the designed optimal modulation scheme is implemented on a DSPs and the design methodology is verified with experimental results on a 300V-1.5kW NIBB prototype.
Analysis on Spatial Structure of China State Historical and Cultural Cities
Zhang, Wei,Li, Dongcheng,Du, Bingqing 한중경제문화학회 2015 한중경제문화연구 Vol.5 No.-
The China state historical and cultural cities are important constituent of tourism resources in our country. However, for all sorts of reasons, the development condition of every city is extremely imbalanced. This paper with quantitative analysis the three main essential factors which are destination of tourists, source of tourists and traveling channel of Leiper's traveling geography system model, are calculate by geographical index and economic index, such as the average nearest distance, the Gini's coefficient, the non-equilibrium index and the coefficient of geographical and so on. The paper reveals the relations amongthe destination, source of tourists and the traveling channel. The research can provide the basis for tourism’s development of the China state historical and cultural cities.
Guangyue Huang,Bingqing Ma,Jie Yang 대한수학회 2020 대한수학회보 Vol.57 No.6
We study rigidity results for the Einstein metrics as the critical points of a family of known quadratic curvature functionals involving the scalar curvature, the Ricci curvature and the Riemannian curvature tensor, characterized by some pointwise inequalities involving the Weyl curvature and the traceless Ricci curvature. Moreover, we also provide a few rigidity results for locally conformally flat critical metrics.
Rigidity of complete Riemannian manifolds with vanishing Bach tensor
Guangyue Huang,Bingqing Ma 대한수학회 2019 대한수학회보 Vol.56 No.5
For complete Riemannian manifolds with vanishing Bach tensor and positive constant scalar curvature, we provide a rigidity theorem characterized by some pointwise inequalities. Furthermore, we prove some rigidity results under an inequality involving $L^{\frac{n}{2}}$-norm of the Weyl curvature, the traceless Ricci curvature and the Sobolev constant.
A hierarchical semantic segmentation framework for computer vision-based bridge damage detection
Jingxiao Liu,Yujie Wei,Bingqing Chen,Hae Young Noh 국제구조공학회 2023 Smart Structures and Systems, An International Jou Vol.31 No.4
Computer vision-based damage detection enables non-contact, efficient and low-cost bridge health monitoring, which reduces the need for labor-intensive manual inspection or that for a large number of on-site sensing instruments. By leveraging recent semantic segmentation approaches, we can detect regions of critical structural components and identify damages at pixel level on images. However, existing methods perform poorly when detecting small and thin damages (e.g., cracks); the problem is exacerbated by imbalanced samples. To this end, we incorporate domain knowledge to introduce a hierarchical semantic segmentation framework that imposes a hierarchical semantic relationship between component categories and damage types. For instance, certain types of concrete cracks are only present on bridge columns, and therefore the noncolumn region may be masked out when detecting such damages. In this way, the damage detection model focuses on extracting features from relevant structural components and avoid those from irrelevant regions. We also utilize multi-scale augmentation to preserve contextual information of each image, without losing the ability to handle small and/or thin damages. In addition, our framework employs an importance sampling, where images with rare components are sampled more often, to address sample imbalance. We evaluated our framework on a public synthetic dataset that consists of 2,000 railway bridges. Our framework achieves a 0.836 mean intersection over union (IoU) for structural component segmentation and a 0.483 mean IoU for damage segmentation. Our results have in total 5% and 18% improvements for the structural component segmentation and damage segmentation tasks, respectively, compared to the best-performing baseline model.
Structure and Electrical Resistivity of the Al - Carbon Nanotube Composites
Xu, Cailu,Wei, Bingqing,Liang, Ji,Wu, Dehai 대한금속재료학회(대한금속학회) 1998 METALS AND MATERIALS International Vol.4 No.4
In thin paper the microstructure and the electrical resistivity of the hot-pressed Al-carbon nanotube composites have been measured. The results show that there is AlC or A1C₂ phases in the structure, the electrical resistivity of the samples with carbon nanotubes at room temperature is slightly higher than that of the samples without carbon nanotubes. There is an abrupt drop of the electrical resistivity of the Al-carbon nanotube composites at about 80 K, which is similar to the superconducting transition.
RIGIDITY OF COMPLETE RIEMANNIAN MANIFOLDS WITH VANISHING BACH TENSOR
Huang, Guangyue,Ma, Bingqing Korean Mathematical Society 2019 대한수학회보 Vol.56 No.5
For complete Riemannian manifolds with vanishing Bach tensor and positive constant scalar curvature, we provide a rigidity theorem characterized by some pointwise inequalities. Furthermore, we prove some rigidity results under an inequality involving $L^{\frac{n}{2}}$-norm of the Weyl curvature, the traceless Ricci curvature and the Sobolev constant.