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关键词： Sensors   Autonomous aerial vehicles   Approximation algorithms   Disasters   Wireless sensor networks   Capacitive sensors   Water pollution   Social networking (online)   Contamination   Computer science   UAV deployment   sensor placement   submodular function maximization   approximation algorithms  

摘要： In this paper, we study a connected submodular function maximization problem, which arises from many applications including deploying UAV networks to serve users and placing sensors to cover Points of Interest (PoIs). Specifically, given a budget K , the problem is to find a subset S with K nodes from a graph G , so that a given submodular function f(S) on S is maximized and the induced subgraph G[S] by the nodes in S is connected, where the submodular function f can be used to model many practical application problems, such as the number of users within different service areas of the deployed UAVs in S , the sum of data rates of users served by the UAVs, the number of covered PoIs by placed sensors, etc. We then propose a novel 1-1/e/2h+2 -approximation algorithm for the problem, improving the best approximation ratio 1-1/e/2h+3 for the problem so far, through estimating a novel upper bound on the problem and designing a smart graph decomposition technique, where e is the base of the natural logarithm, h is a parameter that depends on the problem and its typical value is 2. In addition, when h=2 , the algorithm approximation ratio is at least 1-1/e/5 and may be as large as 1 in some special cases when K <= 23 , and is no less than 1-1/e/6 when K >= 24 , compared with the current best approximation ratio 1-1/e/7(=1-1/e/2h+3) for the problem. Finally, experimental results in the application of deploying a UAV network demonstrate that, the number of users within the service area of the deployed UAV network by the proposed algorithm is up to 7.5% larger than those by existing algorithms, and the throughput of the deployed UAV network by the proposed algorithm is up to 9.7% larger than those by the algorithms. Furthermore, the empirical approximation ratio of the proposed algorithm is between 0.7 and 0.99, which is close to the theoretical maximum value one.

关键词： physics   biological sciences   computer science   engineering  

摘要： How actin filaments (F-actins) are dynamically reorganized in motile cells at the level of individual filaments is an open question. To find the answer, a high-speed atomic force microscopy (HS-AFM) system has been developed to live-imagine intracellular dynamics of the individual F-actins. However, noise and low resolution made it difficult to fully recognize individual F-actins in the HS-AFM images. To tackle this problem, we developed a new machine learning method that quantitatively recognizes individual F-actins. The method estimates F-actin orientation from the image while improving the resolution. We found that F-actins were oriented at +/- 35 degrees toward the membrane in the lamellipodia, which is consistent with Arp2/3 complex-induced branching. Furthermore, in the cell cortex our results showed non-random orientation at four specific angles, suggesting a new mechanism for F-actin organization demonstrating the potential of our newly developed method to fundamentally improve our understanding of the structural dynamics of F-actin networks.

关键词： Computer science   artificial intelligence  

ISBN: (数字)9781394268832 ISBN: (纸本)9781394268801

摘要： The book provides a comprehensive understanding of cutting-edge research and applications at the intersection of genomics and advanced AI techniques and serves as an essential resource for researchers, bioinformaticians, and practitioners looking to leverage genomics data for AI-driven insights and innovations.

关键词： Natural sciences   Applied sciences   Computer science  

摘要： 3D building models have a complex structure and a large number of triangular meshes, which can put great pressure on computer real-time rendering. Therefore, the model needs to be simplified to reduce the number of meshes without affecting the overall visual effect of the model. The algorithm in this paper is based on triangle folding, which simplifies more but loses model details. In order to make up for the shortcoming of triangle folding, more constraints need to be introduced for error control. Meanwhile, this paper solves the problem of higher complexity of the algorithm due to the introduction of more constraints by calculating the Mahalanobis distance of each constraint factor introduced. The vertices with obvious sharp features are constrained to keep the structure of the model undeformed. Experiments prove that the algorithm in this paper can better preserve the detailed features and the visual effect of the model.

关键词： Computer science   Machine learning   Physics  

摘要： John Hopfield and Geoffrey Hinton pioneered computational methods that enabled the development of neural networks.

关键词： 航空科技文献   信息   检索方法  

摘要： 随着航空工业的迅速发展,航空科技文献的品种和数量都在快速增长,航空文献的传递方式也随着互联网的发展不断更新和改进.基于此,本文介绍航空科技文献的计算机检索方法与获取途径,通过实例解析进一步分析航空科技文献检索的基本步骤与过程.本研究可以为航空科技工作者提供有效的文献检索方法和获取途径,有助于他们快速、准确地获取所需的文献信息,从而推动航空科技的进步和发展.

关键词： Editor In Chief   Computer Science   Editorial Board   IEEE Transactions  

摘要： Provides society information that may include news, reviews or technical notes that should be of interest to practitioners and researchers.

关键词： Quality of life   Eco-efficiency   Coupled coordination   Data envelopment analysis   Zoning control  

摘要： It is crucial to clarify the interaction mechanism between quality of life (QOL) and eco-efficiency (EE) to achieve high-quality urban development. This study investigated the complex and dynamic interaction and coupling process between QOL and EE. By constructing two evaluation index systems, this study obtained the values of QOL and EE levels in 282 cities from 2008 to 2020. Then, the interactive relationship between QOL and EE was investigated from two perspectives: static coupling and dynamic coupling. The different development types were classified according to the regional differences between them. The results show that: (1) From 2008 to 2020, the value of QOL gradually increased, while the EE exhibited a "V-shaped" change. Medium to high levels of QOL were located in cities in the eastern coastal area, while low levels were distributed in the western, central and northeastern regions. Furthermore, medium to high levels of EE were distributed in cities in the eastern coastal and southwestern regions, whereas low levels were found in the central and northwestern regions;(2) Overall, the coupled coordination of QOL and EE got better from 2008 to 2020, showing that the relationship between them was close and that the coordination gradually got better. Consequently, the spatial change of the coupled coordination was more pronounced, the number of mildly uncoordinated cities was gradually decreasing, urban development was shifting from uncoordinated to coordinated, and the clustering characteristics of the coupled coordination degree were consistent with the spatial change characteristics;(3) Moreover, there was a Granger causality relationship between QOL and EE. This means that the degree of their mutual influence increased over time, while their development became less dependent on inertia, with obvious interaction characteristics;and (4) The values of integrated QOL and EE were separately clustered and combined with the type of coupled and coordinated urban dev

关键词： Computer science   artificial intelligence  

ISBN: (数字)9781394242528 ISBN: (纸本)9781394242498

摘要： Artificial Intelligence-Based System Models in Healthcare provides a comprehensive and insightful guide to the transformative applications of AI in the healthcare system. This book is a groundbreaking exploration of the synergies between artificial intelligence and healthcare innovation. In an era where technological advancements are reshaping the landscape of