The multi-layer directed network model focuses on portraying the directionality,diversity and difference of the edges in the *** is also one of the powerful tools for analyzing the complexity of the network system and...
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The multi-layer directed network model focuses on portraying the directionality,diversity and difference of the edges in the *** is also one of the powerful tools for analyzing the complexity of the network system and the heterogeneous interaction characteristics between network *** paper constructs three three-layer directed network models combined with traditional complex network theory and analyzes their degree distribution *** controlling the out-degree and in-degree of the middle-level nodes,a network structure with multi-peak characteristics is *** with numerical simulation,it is concluded that the number of links between the layers of the directed network makes the network characterize the characteristics of unimodal,bimodal,and trimodal;the combination of the optimal mechanism and the changes in the number of inter-layer links,the network characteristics show the coexistence of power law and *** research results of this paper have practical value for the analysis of network generation mechanism and correlation law by using multilayer directed network theory in the era of big data.
We consider the practical NP-complete problem of finding a minimum weight spanning tree with both edge weights and inner nodes weights. We present two polynomial time algorithms with approximation factors of 2.35 ...
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We consider the practical NP-complete problem of finding a minimum weight spanning tree with both edge weights and inner nodes weights. We present two polynomial time algorithms with approximation factors of 2.35 · ln n and 2Hn, respectively, where n is the number of nodes in the graph and Hn is the n-th Harmonic number. This nearly matches the lower bound of (l-\in )Hn, for any \in \ge 0. We also give an approximation algorithm with approximation factor \Delta - 1, where \Delta is the maximum degree of the graph. For metric spaces, we give a 3.105-approximation algorithm and show that an approximation factor of 1.463 is impossible unless {NP \subseteq DTIME[n^{O(\log longn)} ]}.
The Dry-hot Valley Region (DVR) is one of the typical ecologically fragile areas, but also it is a key and difficult region of vegetation rehabilitation in southwestern mountain area of China. Due to the extremely hot...
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Lung cancer is one of the most common cancers in the world, and the detection and classification of benign-malignant lung nodules are critical during the diagnosis and treatment for lung cancer. In this paper, a multi...
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3D mapping for unknown environments is a crucial issue for mobile service robots,which has many important applications in navigation and path *** this paper,we use Microsoft kinect sensor mounted on a mobile robot to ...
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ISBN:
(纸本)9781509009107
3D mapping for unknown environments is a crucial issue for mobile service robots,which has many important applications in navigation and path *** this paper,we use Microsoft kinect sensor mounted on a mobile robot to obtain3 D *** the process,consistent frames of RGB-D data are captured and *** Closest Point(ICP)algorithm and incremental registration method are employed to perform the fine ***,we use OctoMap to store 3D map of octree representation,an efficient data ***,our results demonstrate the practical applicability and effectiveness of the proposed approach.
Efficient scheduling algorithms play an essential part in heterogeneous computing systems (HeCS) to achieve high performance. So we proposed a new efficient dynamic multi-strategies scheduling algorithm (DMS). The bas...
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This paper introduces the theoretical analysis and derivation of localizability estimation for mobile robots based on point cloud observation. Combined with the observation model, the pre-established point cloud map i...
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Pre-trained models are widely used in fine-tuning downstream tasks with linear classifiers optimized by the cross entropy loss, which might face robustness and stability problems. These problems can be improved by lea...
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In recent years, oriented object detection technology has made significant progress. Most oriented object detectors represent oriented bounding boxes by adding additional angle information to the horizontal bounding b...
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The evaluation of programming course instruction is a key component of educational management. However, relying solely on supervising teachers for assessment poses challenges in comprehensive evaluation and providing ...
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