Articles de revues sur le sujet « Temporary Network Structure »
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Zhou, Qiang, Shi-Min Cai et Yi-Cheng Zhang. « Multiscale community estimation based on temporary local balancing strategy ». International Journal of Modern Physics C 31, no 04 (12 février 2020) : 2050056. http://dx.doi.org/10.1142/s0129183120500564.
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Community division in complex networks has become one of the hot topics in the field of network science. Most of the methods developed based on network topology ignore the dynamic characteristics underlying the structure. By exploring the diffusion process in the network based on random walk, this paper sums up the general rule with temporal characteristics as a temporary local balancing strategy which can be used in the community division. The strategy divides the network into different communities according to the duration of a stable local balancing state in the diffusion process. The longer the duration, the more stable the structure of the community in that state. Applying the strategy to computer-generated and real-world networks, respectively, it is proved that these temporary local balancing states existing in the diffusion process can reveal the internal community structure of the network. In addition, the modular structure appears at different time scales of diffusion process, similar to the hierarchical organization, and also provides a new perspective for multiscale network community detection.
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Song, Kyungwoo, Mingi Ji, Sungrae Park et Il-Chul Moon. « Hierarchical Context Enabled Recurrent Neural Network for Recommendation ». Proceedings of the AAAI Conference on Artificial Intelligence 33 (17 juillet 2019) : 4983–91. http://dx.doi.org/10.1609/aaai.v33i01.33014983.
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A long user history inevitably reflects the transitions of personal interests over time. The analyses on the user history require the robust sequential model to anticipate the transitions and the decays of user interests. The user history is often modeled by various RNN structures, but the RNN structures in the recommendation system still suffer from the long-term dependency and the interest drifts. To resolve these challenges, we suggest HCRNN with three hierarchical contexts of the global, the local, and the temporary interests. This structure is designed to withhold the global long-term interest of users, to reflect the local sub-sequence interests, and to attend the temporary interests of each transition. Besides, we propose a hierarchical context-based gate structure to incorporate our interest drift assumption. As we suggest a new RNN structure, we support HCRNN with a complementary bi-channel attention structure to utilize hierarchical context. We experimented the suggested structure on the sequential recommendation tasks with CiteULike, MovieLens, and LastFM, and our model showed the best performances in the sequential recommendations.
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Xin, Lai, Zhao De Cun, Huang Long Yang et Wu D. Ti. « Hybrid Air Route Network Simulation Based on Improved RW-Bucket Algorithm ». International Journal of Information Technologies and Systems Approach 15, no 1 (1 janvier 2022) : 1–19. http://dx.doi.org/10.4018/ijitsa.304808.
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The fixed-route network is the basis for airlines to carry out flight direction planning. Some countries and regions have introduced temporary routes as a supplement to the fixed route structure. Temporary routes have the advantages of intercepting curves and straightening, and less detouring areas, which can save airlines fuel consumption and improve operational efficiency. This article takes the mixed airline's route network as the research object. Firstly, the structural properties of mixed air route networks are analyzed by using complex network theory. Secondly, the RW-bucket algorithm to generate a mixed air route network structure is analyzed. According to the conclusion of the analysis, the RW-bucket algorithm is improved. Finally two flight information region route network data are used to verify the proposed hybrid route network construction method by computer simulation.
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Zhang, Wenbo, Jing Wang, Guangjie Han, Xinyue Zhang et Yongxin Feng. « A Cluster Sleep-Wake Scheduling Algorithm Based on 3D Topology Control in Underwater Sensor Networks ». Sensors 19, no 1 (4 janvier 2019) : 156. http://dx.doi.org/10.3390/s19010156.
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3D topology control in underwater sensor networks is of great significance to ensuring reliable and efficient operation of the network. In this paper, by analyzing the characteristics of an underwater sensor network, we take the cube as the basic unit to perform 3D partition of the monitoring area, define the 3D partition unit and basic cluster structure of the underwater sensor network, and arrange rotating temporary control nodes in the cluster. Then, a cluster sleep-wake scheduling algorithm is proposed that compares the remaining node energy. It selects the node with the largest remaining energy as the working node, and the remaining nodes complete the transition of dormancy and waiting states as long as they reach the preset dormancy time. The node state settings of this phase are completed by the temporary control node. Temporary control nodes selecting and sleep-wake scheduling are used in the algorithm through 3D topology control, which reduces energy consumption and guarantees maximum sensing coverage of the entire network and the connection rate of active nodes. Simulation results further verify the effectiveness of the proposed algorithm.
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Ngoc, Quang Tran, Seunghyun Lee et Byung Cheol Song. « Facial Landmark-Based Emotion Recognition via Directed Graph Neural Network ». Electronics 9, no 5 (6 mai 2020) : 764. http://dx.doi.org/10.3390/electronics9050764.
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Facial emotion recognition (FER) has been an active research topic in the past several years. One of difficulties in FER is the effective capture of geometrical and temporary information from landmarks. In this paper, we propose a graph convolution neural network that utilizes landmark features for FER, which we called a directed graph neural network (DGNN). Nodes in the graph structure were defined by landmarks, and edges in the directed graph were built by the Delaunay method. By using graph neural networks, we could capture emotional information through faces’ inherent properties, like geometrical and temporary information. Also, in order to prevent the vanishing gradient problem, we further utilized a stable form of a temporal block in the graph framework. Our experimental results proved the effectiveness of the proposed method for datasets such as CK+ (96.02%), MMI (69.4%), and AFEW (32.64%). Also, a fusion network using image information as well as landmarks, is presented and investigated for the CK+ (98.47% performance) and AFEW (50.65% performance) datasets.
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Vitomsky, E. V., et D. N. Somov. « Methods for protecting local wireless network aimed at providing temporary silency of signals and information interaction structure ». Issues of radio electronics, no 3 (26 avril 2020) : 35–40. http://dx.doi.org/10.21778/2218-5453-2020-3-35-40.
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This work is devoted to the security problem of wireless local area networks. It is known that against a number of typical attacks, the most common IEEE802.11 networks are poorly protected. Existing ways of solving this problem with the help of regular wireless device software are not effective enough, and against some attacks, it is even not possible. One of the reasons, which complicates the solution of this problem, is low level of temporal and spatial security of modern wireless network. Based on the analysis of common attacks on Wi-Fi networks, original protection methods have been developed to consider this aspect. These methods were embodied in a real device. Protection methods are implemented by slightly modifying the standard software of the device having an open hardware platform. An experiment was carried out using this device, which confirmed the possibility of deploying a local wireless network which security was enhanced using the methods proposed in this paper.
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Cheng, Le Feng, Lin Fei Yin, Jing Jiang et Tao Yu. « Temporary Grounding Lines Detection Method for Distribution Network and its EMTDC Simulation ». Advanced Materials Research 971-973 (juin 2014) : 1361–67. http://dx.doi.org/10.4028/www.scientific.net/amr.971-973.1361.
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In order to solve the safety problem of disassembling the grounding wire temporarily for line maintenance and prevent an anthropogenic short-circuit accident from happening, this paper firstly proposes two safe and convenient detection methods based on directly signal injecting and induced voltage. Then, adopt the power system simulation software PSCAD/EMTDC to build model, some important factors affecting the effect of detecting are studied, which include frequency of signal, no-load transformer, magnetic induced voltage, joint use on the same tower, etc. Finally, a temporary ground wire detection device is developed which is based on the detection methods proposed and also based on modern power electronics technology and signal processing technology, and the field test verify the feasibility and practicability. The developed detection device has some advantages, such as safe-testing, simple structure and operation, easy promotion and so on.
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Obermann, Anne, Irene Molinari, Jean-Philippe Métaxian, Francesco Grigoli, Wilfried Strauch et Stefan Wiemer. « Structure of Masaya and Momotombo volcano, Nicaragua, investigated with a temporary seismic network ». Journal of Volcanology and Geothermal Research 379 (juillet 2019) : 1–11. http://dx.doi.org/10.1016/j.jvolgeores.2019.04.013.
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Cho, Kwang Soo, Jae Woo Kim, Jung-Eun Bae, Ji Ho Youk, Hyun Jeong Jeon et Ki-Won Song. « Effect of temporary network structure on linear and nonlinear viscoelasticity of polymer solutions ». Korea-Australia Rheology Journal 27, no 2 (mai 2015) : 151–61. http://dx.doi.org/10.1007/s13367-015-0015-y.
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Goev, Andrey, Sergey Volosov, Irina Sanina, Nataliya Konstantinovskaya et Margarita Nesterkina. « Registration opportunities of the temporary seismological network of IDG RAS on EEC ». Russian Journal of Seismology 2, no 2 (23 juin 2020) : 84–90. http://dx.doi.org/10.35540/2686-7907.2020.2.08.
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In 2017, as a part of the study of the deep structure of the central part of the East European craton (EEC), three temporary seismic observation points were installed. They were equipped with broadband three-component sensors. The position of the stations is due to the need to build a seismic section in the sub-latitudinal direction in order to study the collision zone of the triple junction of mega blocks in the central part of the EEC. Together with the small-aperture seismic array "Mikhnevo" (MHVAR), temporary seismic stations form an area observation system with distances between stations of the order of 100 km. In 2018, the stations of the temporary network of the IDG RAS had registered 765 events of various nature: 222 industrial explosions and 543 earthquakes. During the year, the "Mikhnevo" array records about 5000 events, of which about 1000 are earthquakes at teleseismic and regional distances, and about 900 are identified as industrial explosions. Mutual processing of observed data on the temporary network and on the "Mikhnevo" in some cases (17%) made it possible to specify the results of the location of industrial explosions obtained previously at the "Mikhnevo" over 10 km.
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Yuan, Bo, Jin Dou Fan et Bin Liu. « Cooperative Mechanism of Local Memory and Cache in Network Processors ». Applied Mechanics and Materials 380-384 (août 2013) : 1969–72. http://dx.doi.org/10.4028/www.scientific.net/amm.380-384.1969.
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Traditional network processors (NPs) adopt either local memory mechanism or cache mechanism as the hierarchical memory structure. The local memory mechanism usually has small on-chip memory space which is not fit for the various complicated applications. The cache mechanism is better at dealing with the temporary data which need to be read and written frequently. But in deep packet processing, cache miss occurs when reading each segment of packet. We propose a cooperative mechanism of local memory and cache. In which the packet data and temporary data are stored into local memory and cache respectively. The analysis and experimental evaluation shows that the cooperative mechanism can improve the performance of network processors and reduce processing latency with little extra resources cost.
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Gaba, Seema. « Analysis on Performance Matrices of Routing protocols of Mobile Ad-Hoc Networks ». International Journal for Research in Applied Science and Engineering Technology 10, no 6 (30 juin 2022) : 1526–29. http://dx.doi.org/10.22214/ijraset.2022.44092.
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Abstract: An ad-hoc network is a local area network which has been constructed to connect the one or more devices accordingly. It is a cluster of cellular mobile nodes that are collected with one-another, which form a transitory network, which means to form a temporary structure and there is no need of any permanent support. However, it will attach all nodes with the use of cellular network structure. At compile time, if there is any problem occur that will harm the network, than it can modify the channel from one node to another node. Therefore, because of greatly effective conditions to make networks in very difficult. To avoid these conditions that will harm the network, some protocols are introduced which includes the reactive routing protocols, pro-active routing protocols, cluster- based routing protocol, a hybrid-based routing protocol, Ad- hoc on demand distance routing protocol, optimized link state routing. This review paper gives the performance analysis of routing protocols based on their properties, characteristics, functions, and their shortcomings.
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Рыжова, A. Ryzhova, Володькин et P. Volodkin. « TRADING LOGISTICS ENTERPRISES ON THE EXAMPLE OF THE RETAIL NETWORK LTD. «ADIDAS» ». Alternative energy sources in the transport-technological complex : problems and prospects of rational use of 3, no 1 (16 mars 2016) : 437–42. http://dx.doi.org/10.12737/17919.
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The article presents the results of the structure of commercial enterprise and the movement of goods from producers to customers and within the trade network, i.e. from the consolidation warehouse to the retail outlets, as well as strategy logistic LTD. "Adidas" on the territory of Russia by an accumulation of inventory at the warehouse of temporary storage
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Krishna Karne, Radha, Dudimetla Prasad, Uzma Naseem, Ashok Battula et Karthik Kumar Vaigandla. « GENETIC ALGORITHM FOR WIRELESS SENSOR NETWORKS ». International Journal of Engineering Applied Sciences and Technology 6, no 8 (1 décembre 2021) : 97–103. http://dx.doi.org/10.33564/ijeast.2021.v06i08.018.
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Ad hoc networks are made up of a collection of wireless mobile nodes that form a temporary network with no pre-existing infrastructure or centralized management.Routing policies are crucial in determining how traffic is forwarded across a network. Adhoc networks necessitate a routing method that is very adaptable. Finding the shortest path (SP) between source and destination in a specific period of time to meet Quality of Service standards is one of the most common issues in these networks (QoS). QoS routing is difficult in an Ad hoc network because the topology changes frequently and it takes time since many QoS criteria such as distance, cost, and energy are all variable, and the state information supplied for routing is inherently faulty. The optimum path for Adhoc networks is found using a Genetic Algorithm (GA) in this paper.GA uses natural evolution-inspired methodologies to find answers to optimization problems. Crossover and mutation operations, as well as the proper chromosome structure, are all defined.
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Litvak-Hinenzon, Anna, et Lewi Stone. « Spatio-temporal waves and targeted vaccination in recurrent epidemic network models ». Journal of The Royal Society Interface 6, no 38 (28 octobre 2008) : 749–60. http://dx.doi.org/10.1098/rsif.2008.0343.
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The success of an infectious disease to invade a population is strongly controlled by the population's specific connectivity structure. Here, a network model is presented as an aid in understanding the role of social behaviour and heterogeneous connectivity in determining the spatio-temporal patterns of disease dynamics. We explore the controversial origins of long-term recurrent oscillations believed to be characteristic of diseases that have a period of temporary immunity after infection. In particular, we focus on sexually transmitted diseases such as syphilis, where this controversy is currently under review. Although temporary immunity plays a key role, it is found that, in realistic small-world networks, the social and sexual behaviour of individuals also has a great influence in generating long-term cycles. The model generates circular waves of infection with unusual spatial dynamics that depend on focal areas that act as pacemakers in the population. Eradication of the disease can be efficiently achieved by eliminating the pacemakers with a targeted vaccination scheme. A simple difference equation model is derived, which captures the infection dynamics of the network model and gives insights into their origins and their eradication through vaccination. Illustrative videos may be found in the electronic supplementary material.
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Rauch, Erwin, Dominik T. Matt et Patrick Dallasega. « Mobile Factory Network (MFN) – Network of Flexible and Agile Manufacturing Systems in the Construction Industry ». Applied Mechanics and Materials 752-753 (avril 2015) : 1368–73. http://dx.doi.org/10.4028/www.scientific.net/amm.752-753.1368.
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The concept of the "On-site Factory" consists in the temporary use of fully functioning mobile mini-factories or production cells at the site of consumption. Mobile Factories are well suitable for situations in the construction industry with long distances and therefore high logistics costs. The advantage of this concept is its economic efficiency combined with a maximum of flexibility and a just-in-time supply. By a high degree of reconfigurability and scalability of the On-site Factory, it can be adapted to its individual mission and the quantity demand at the construction site. This research discusses the need for new and innovative JIT solutions for construction industry and addresses the specific case of networks of mobile on-site factories. The creation of a Mobile Factory Network (MFN) shows an interesting new and innovative business model for decentralized manufacturing on-site. The research shows a possible form of network structure and organization as well as its advantages and potential for the construction sector.
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Cynthia, Prudhvi Krishna Saguturu, C., Komali Bandi, Srikanth Magulluri et T. Anusha. « A survey on MANET protocols in wireless sensor networks ». International Journal of Engineering & ; Technology 7, no 2.31 (29 mai 2018) : 1. http://dx.doi.org/10.14419/ijet.v7i2.31.13384.
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In Wireless sensor networks and ad hoc networks nodes have a freedom to move from one place to another, they are self-configuring this type of the structure fulfil the requirements of several application. A survey on the different MANET protocols will be done in this paper. Mainly this paper will focus on the Quality of Service on the different parameters like Throughput and Delay between different protocols like AODV (Ad Hoc on Demand Distance Vector), DSDV (Destination-Sequenced Distance-Vector Routing), DSR (Dynamic Source Routing), and TORA (Temporary Ordered Routing Algorithm). DSDV is called as proactive protocol because they know everything about the nodes in the network before the communication start. DSR, AODV, TORA protocols are called reactive protocol because nodes in this network do not know anything about network. They are also called ON-DEMAND routing protocols. After this analysis you will come to know which MANET protocol is best for different application.
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Zeng, Qicheng, Fan-Chi Lin et Amir A. Allam. « 3D Shear Wave Velocity Model of Salt Lake Valley via Rayleigh Wave Ellipticity across a Temporary Geophone Array ». Seismic Record 2, no 2 (1 avril 2022) : 127–36. http://dx.doi.org/10.1785/0320220016.
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Abstract We construct a 3D shear velocity model of the Salt Lake Valley using Rayleigh waves excited by the 31 March 2020 Mw 6.5 central Idaho earthquake recorded on a 168-station temporary nodal geophone network and the 49-station permanent regional network. The temporary array—deployed in response to the March 18 Mw 5.7 Magna earthquake—serendipitously recorded clear surface waves between 10 and 20 s period from the Idaho event at ∼500 km epicentral distance, from which we measure both Rayleigh wave phase velocity and ellipticity (H/V ratio). In addition, we employ multicomponent earthquake coda cross correlation to extend the measurements down to 5 s period. Because Rayleigh wave ellipticity features outstanding shallow sensitivity, we invert for a 3D upper crust VS model of the Salt Lake Valley. Our model shows basin structure in general agreement with and complements the current Community Velocity Model, which is mostly constrained by borehole and gravity measurements. Our model thus provides critical information for future earthquake hazard assessment studies, which require detailed shallow velocity structure.
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Nakazaki, Yohsuke, et Shintaro Komami. « Choice of PV's Favorable Constant Leading Power Factor Considering Temporary Structure and Metamorphosis of Distribution Network ». IEEJ Transactions on Power and Energy 139, no 3 (1 mars 2019) : 170–77. http://dx.doi.org/10.1541/ieejpes.139.170.
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Ruan, Chengwei, Haiyan Yang, Lei Yu et Yingxin Kou. « Combat Network Synchronization of UCAV Formation Based on RTBA Model ». Mathematical Problems in Engineering 2016 (2016) : 1–11. http://dx.doi.org/10.1155/2016/2630790.
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The paper aims at developing an efficient method to acquire a proper UCAV formation structure with robust and synchronized features. Here we introduce the RTBA (Route Temporary Blindness Avoidance) model to keep the structure stable and the HPSO (hybrid particle swarm optimization) method is given to find an optimal synchronized formation. The major contributions include the following: (1) setting up the dynamic hierarchy topologic structure of UCAV formation; (2) the RTB phenomenon is described and the RTBA model is put forward; (3) the node choosing rules are used to keep the invulnerability of the formation and the detective information quantifying method is given to measure the effectiveness of the connected nodes; and (4) the hybrid particle swarm optimization method is given to find an optimal synchronized topologic structure. According to the related principles and models, the simulations are given in the end, and the results show that the simplification of the model is available in engineering, and the RTBA model is useful to solve the real problems in combat in some degree.
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Melnik, V., A. Nikiforov, Al Zelensky, An Zelensky et R. Antoshchemkov. « Distributed Control System for Agrotechnical Processes Using Customizable Procedural Regulations ». Journal of Physics : Conference Series 2224, no 1 (1 avril 2022) : 012093. http://dx.doi.org/10.1088/1742-6596/2224/1/012093.
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Abstract Nowadays, the technical and technological capabilities achieved in the field of agriculture permit to implement quickly convertible (adaptive) crop production systems. This, along with increased efficiency, also greatly complicates the management process. Automated control systems (ACS) with adaptive properties are needed. The concept of creating an ACS assumes the implementation of the principle of modularity and flexible changes in the structure of the management hierarchy, powers, tasks and functions for geographically distributed decision-making centers and executors. Key technologies in the design of such ACS are: synthesis of a temporary control loop from geographically distributed elements and synthesis of procedural regulations for a decision-making center included in the temporary control loop. The article formulates the problem of synthesis of procedural regulations in the form of a tensor transformation problem of the original electrical network (library of procedures) into a network with specified properties. A method for obtaining the tensor equation of transformation of the original network is presented based on the requirements for the composition of the input and output data of the synthesized procedural regulations. The solution obtained after tensor transformation has the form of a matrix of connections and a vector of voltages on the intermediate coils of the original electrical network (library of procedures). This forms structural links for the synthesized procedural rules. The demonstrated approach can be extended to solve a wide range of problems of adaptive changes in the structures of organizational management systems.
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Bociarska, Monika, Julia Rewers, Dariusz Wójcik, Weronika Materkowska et Piotr Środa. « Passive seismic experiment “AniMaLS” in the Polish Sudetes (NE Variscides) ». Geoscientific Instrumentation, Methods and Data Systems 10, no 2 (2 septembre 2021) : 183–202. http://dx.doi.org/10.5194/gi-10-183-2021.
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Abstract. The paper presents information about the seismic experiment “AniMaLS” which aims to provide a new insight into the crust and upper mantle structure beneath the Polish Sudetes (NE margin of the Variscan orogen). The seismic network composed of 23 temporary broadband stations was operated continuously for about 2 years (October 2017 to October 2019). The dataset was complemented by records from eight permanent stations located in the study area and in the vicinity. The stations were deployed with an inter-station spacing of approximately 25–30 km. As a result, recordings of local, regional and teleseismic events were obtained. We describe the aims and motivation of the project, the station deployment procedure, as well as the characteristics of the temporary seismic network and of the permanent stations. Furthermore, this paper includes a description of important issues like data transmission setup, status monitoring systems, data quality control, near-surface geological structure beneath stations and related site effects, etc. Special attention was paid to verification of correct orientation of the sensors. The obtained dataset will be analysed using several seismic interpretation methods, including analysis of seismic anisotropy parameters, with the objective of extending knowledge about the lithospheric and sublithospheric structure and the tectonic evolution of the study area.
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Simanjuntak, Andrean V. H., Naikson Fandier Saragih, Muhajir Anshori, Marzuki Sinambela, Ar Razi, Umar Muksin, Afryanti V. Simangunsong, Noviana Sihotang, Yusran Asnawi et Indra Kelana Jaya. « A Preliminary Earthquake Detection from The Seismic Temporary Network in The Opak Fault ». IOP Conference Series : Earth and Environmental Science 1083, no 1 (1 septembre 2022) : 012072. http://dx.doi.org/10.1088/1755-1315/1083/1/012072.
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Abstract Microseismic observation is a mandatory tool for analysing and imaging the progress of source earthquake mechanism. The observation of low-quality signal is usually found because of false detection, transient signals by natural noise, or related to seismometer condition and some human activities. Therefore, we try to figure the microseismic phenomenon after major earthquake in the Jogjakarta fault that was generated by an active fault namely Opak Fault. We used the seismic data recording from the seismic project that was installed in 2006 cover the Jogjakarta region. We used one week data to see the potential detection and highlight the possible of positive or negative false detection. With total 16 stations, we got ~500 events in only one week recording. We used a various threshold with 110 to scan all the dataset and we obtained ~450 events with 50-100 events with possible of false positives. Meanwhile, the threshold of 112 has < 50 events that could be suitable with the waveforms. The example results of 120 thresholds figure a strong event that is located by highly resolution of stack coherent from some stations with precise of P and S phase fitting. This study present the first automatic earthquake locations that can provide more detail of seismic structure information in the Jogjakarta region.
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Cheng, Xiaokang, et Narisa Zhao. « Modelling the Diffusion of Investment Decisions on Modular Social Networks ». Complexity 2020 (7 mai 2020) : 1–8. http://dx.doi.org/10.1155/2020/2981231.
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In the financial market, information and investment behaviors disseminate in investor social networks, and different contagion patterns may cause diverse investment trends. Prior studies have investigated the impact of investor social networks, but few have considered community structure. In this paper, we study the impact of the community structure of investor social networks on the diffusion of internet investment products. A two-stage diffusion model is proposed, and the clustering coefficient and modularity of an investor social network are considered. The results show that both modularity and the clustering coefficient have an impact on the diffusion velocity and scale and that the impact is most evident at the stage of explosive growth. The negative influence of a large modularity can be hardly mitigated by adjusting other factors. Furthermore, a decrease in modularity and an increase in the clustering coefficient can better facilitate diffusion when the temporary investment rate is high and can partly offset the negative impact of information discarding and divestment.
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Tiedeken, Erin Jo, et Jane C. Stout. « Insect-Flower Interaction Network Structure Is Resilient to a Temporary Pulse of Floral Resources from Invasive Rhododendron ponticum ». PLOS ONE 10, no 3 (12 mars 2015) : e0119733. http://dx.doi.org/10.1371/journal.pone.0119733.
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Carrillo, Facundo, Guillermo A. Cecchi, Mariano Sigman et Diego Fernández Slezak. « Fast Distributed Dynamics of Semantic Networks via Social Media ». Computational Intelligence and Neuroscience 2015 (2015) : 1–9. http://dx.doi.org/10.1155/2015/712835.
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We investigate thedynamicsof semantic organization using social media, a collective expression of human thought. We propose a novel, time-dependent semantic similarity measure (TSS), based on the social network Twitter. We show that TSS is consistent with static measures of similarity but provides high temporal resolution for the identification of real-world events and induced changes in the distributed structure of semantic relationships across the entire lexicon. Using TSS, we measured the evolution of a concept and its movement along the semantic neighborhood, driven by specific news/events. Finally, we showed that particular events may trigger a temporary reorganization of elements in the semantic network.
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Bellucci, Devis, Valeria Cannillo, Andrea Cattini et Antonella Sola. « A New Generation of Scaffolds for Bone Tissue Engineering ». Advances in Science and Technology 76 (octobre 2010) : 48–53. http://dx.doi.org/10.4028/www.scientific.net/ast.76.48.
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The design of bioceramic scaffolds, i.e. artificial structures employed as temporary templates for cell proliferation, is a crucial issue in bone tissue reconstruction and regeneration. An ideal scaffold should be highly porous and bioactive. Additionally, a resistant and permeable surface is required in order to have manageable samples. The production of scaffolds by means of the widely used replication method can lead to samples with weak and brittle surfaces and poor mechanical properties, therefore alternative preparation procedures are necessary. In this work a new protocol to realize bioceramic scaffolds is presented. The obtained samples have an original structure, characterized by an external resistant surface together with a highly porous internal network. The external surface, which behaves as a load-bearing structure for the entire scaffold, guarantees high permeability and manageability. Here the proposed protocol is briefly discussed, together with an overview on the structure of the realized samples. Finally, some preliminary data regarding the scaffolds in-vitro bioactivity are reported.
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CHENG, Shou-ye, Feng GAO, Guo-ye JING, Ming ZHOU, Bo HAN et Zheng TANG. « An Intelligent Temporary While-Boring Support Technology For Raise Boring Method ». E3S Web of Conferences 233 (2021) : 01075. http://dx.doi.org/10.1051/e3sconf/202123301075.
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Ensuring the stability of the shaft structure is one of the key technologies for the application of raise boring method. In the process of reaming through rock formations with water disintegration characteristics, the impact of water gushing and drenching may induce partial collapse. To solve this problem, an intelligent temporary while-boring support technology is proposed in this paper. Firstly, the main characteristics of the technology are introduced. Utilizing the space inside the raise boring pipes, the material conveying pipes and nozzle can reach the lower part of the reamer to realize spraying support. Secondly, a composite cementitious supporting material with good mechanical properties is developed to ensure the sealing and waterproofing of the surrounding rock. Thirdly, a test study was carried out on key process parameters. The results show that the best engineering economic benefits under the condition that the rotation speed is 2r/min and the distance between the nozzle and the surrounding rock is 1m. Fourthly, an image classification algorithm based on Resnet-34 convolutional neural network is proposed, which realizes the intelligent judgment of the effect of surrounding rock support. Finally, an industrial test was carried out in Lijiahao Coal Mine. The test results show that the intelligent temporary while-boring support technology proposed in this paper has a good performance, effectively achieving the sealing and water resistance of the surrounding rock, and the shaft structure has not been damaged.
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Kim, Alexander, Kyuhyup Lee, Seojoon Lee, Jinwoo Song, Soonwook Kwon et Suwan Chung. « Synthetic Data and Computer-Vision-Based Automated Quality Inspection System for Reused Scaffolding ». Applied Sciences 12, no 19 (8 octobre 2022) : 10097. http://dx.doi.org/10.3390/app121910097.
Texte intégralRésumé :
Regular scaffolding quality inspection is an essential part of construction safety. However, current evaluation methods and quality requirements for temporary structures are based on subjective visual inspection by safety managers. Accordingly, the assessment process and results depend on an inspector’s competence, experience, and human factors, making objective analysis complex. The safety inspections performed by specialized services bring additional costs and increase evaluation times. Therefore, a temporary structure quality and safety evaluation system based on experts’ experience and independent of the human factor is the relevant solution in intelligent construction. This study aimed to present a quality evaluation system prototype for scaffolding parts based on computer vision. The main steps of the proposed system development are preparing a dataset, designing a neural network (NN) model, and training and evaluating the model. Since traditional methods of preparing a dataset are very laborious and time-consuming, this work used mixed real and synthetic datasets modeled in Blender. Further, the resulting datasets were processed using artificial intelligence algorithms to obtain information about defect type, size, and location. Finally, the tested parts’ quality classes were calculated based on the obtained defect values.
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Cowl, Veronica B., Keith Jensen, Jessica M. D. Lea, Susan L. Walker et Susanne Shultz. « Sulawesi Crested Macaque (Macaca nigra) Grooming Networks Are Robust to Perturbation While Individual Associations Are More Labile ». International Journal of Primatology 41, no 1 (février 2020) : 105–28. http://dx.doi.org/10.1007/s10764-020-00139-6.
Texte intégralRésumé :
AbstractSocial and environmental disturbance occurs naturally, and species in bonded social groups should be resilient to it. Empirical evidence of social responses to disturbance in primates, however, remains limited. We constructed social networks using group-level scan samples (N = 299) to test the robustness of grooming networks in a captive group of 20 Sulawesi crested macaques (Macaca nigra) to two management interventions involving environmental and social disturbance. During the first, the institution removed six castrated males and one female, contracepted six of the nine remaining females, and moved the group to a new enclosure. The second involved the introduction of a novel, reproductive male five weeks later. Networks remained stable following the first intervention. However, after introduction of the male, the number of grooming partners and the frequency of grooming with non-maternal kin increased in female-only networks. We observed less marked increases in the grooming frequency and number of grooming partners in whole group networks. Ten weeks later, network structure was more similar to that of pre-intervention networks than post-intervention networks. Our results suggest that reproductive males play a more important role in structuring Sulawesi crested macaque social networks than castrated males, as networks expanded and relationships between non-maternal kin occurred more frequently after introduction of the reproductive male. However, network responses to interventions appeared to be temporary as networks following a period of acclimation more closely resembled pre-intervention networks than post-intervention networks. Our study demonstrates the utility of social network analysis for understanding the impact of disturbance on stable social groups.
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Singh, Karan, et Rajeev Gupta. « Comparative Assessment and Performance Analysis of Numerous Mobile Ad-Hoc Network Routing Protocols ». Journal of Computational and Theoretical Nanoscience 16, no 9 (1 septembre 2019) : 3906–11. http://dx.doi.org/10.1166/jctn.2019.8269.
Texte intégralRésumé :
Recent progression in the field of information and communication cause increase of packet count over the World Wide Web network. These communicated packets should deliver on time from origin node to destination node using a reliable and shortest route. In this way routing plays an important part in dispatching the packets to destination form the source. This routing becomes more crucial when packets delivery is done in independent mobile nodes which dynamically form a temporary network. This network named as Mobile Ad-Hoc Network and therefore it is said to be particular reason-specific, self-ruling and dynamic. In this paper we analyzed 3 protocols and for a quality of service (i.e., Packet Delivery Ratio) and achieved comparative study of various protocols of routing with respect to Operation of protocols, Route maintenance, Routing table, Route, Route selection, Routing structure, Routing Approaches, Protocol types, Merits and Demerits.
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Porkaew, Juraiporn, Runglawan Somsunan, Kanarat Nalampang et Robert Molloy. « Synthesis and Characterization of Sodium AMPS-Based Interpenetrating Network Hydrogels for Use as Temporary Wound Dressing ». Advanced Materials Research 894 (février 2014) : 300–304. http://dx.doi.org/10.4028/www.scientific.net/amr.894.300.
Texte intégralRésumé :
Hydrogel is one of the most interesting materials for use as wound dressing. In this study, interpenetrating network (IPN) hydrogels were synthesized by free radical copolymerization of sodium salt of 2-acrylamido-2-methylpropane sulfonic acid (AMPS) and N-vinylpyrrolidone (NVP), in the presence of poly (vinyl alcohol) (PVOH). The incorporation of PVOH offered the hydrophilicity to the hydrogel. The polymerization was carried out using N,N-methylene-bis-acrylamide and 4,4-azo-bis (4-cyanopentanoic acid) as a crosslinker and UV-photoinitiator, respectively. The successful of polymerization was indicated by gel content which was in the range of 86 90%. The structure of prepared hydrogels was confirmed by Fourier Transform Infrared Spectroscopy. In addition, the hydrogel-water interaction was investigated by mean of water content and water retention. Manipulation of the AMPS/NVP ratio significantly altered the properties of the hydrogels. As expected, the interaction of hydrogel and water decreased as increasing of NVP contents due to this monomer provides more hydrophobic functional groups. In conclusion, it is believed that the prepared AMPS/NVP/PVOH interpenetrating network hydrogels show the potential for use as temporary wound dressing.
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Santiago, Katerina, Xuan Yang, Estefania C. Ruano-Herreria, Juanita Chalmers, Philip Cavicchia et Alberto J. Caban-Martinez. « Characterising near misses and injuries in the temporary agency construction workforce : qualitative study approach ». Occupational and Environmental Medicine 77, no 2 (2 janvier 2020) : 94–99. http://dx.doi.org/10.1136/oemed-2019-106215.
Texte intégralRésumé :
ObjectivesTo understand and characterise the construct of ‘near misses’ from the perspective of temporary construction workers and to describe the safety and health risks associated with and contributing to near misses and injuries in temporary workers in the construction industry.MethodsSix semistructured language-sensitive (ie, English and Spanish) focus group discussions were conducted with workers (n=43) employed with temporary staffing agencies in South Florida. This convenience sample completed a demographic questionnaire prior to the focus group discussion. A general inductive approach was used to examine near misses in the construction industry and the unique safety and health concerns of temporary workers.ResultsFour broad themes describing near misses, reporting practices and workplace safety hazards in the construction industry were derived from the group discussions: (1) non-standard workers in the construction industry draw a clear distinction between near misses and injury and believe their best protections from both occur at the worker level; (2) social network structure on construction worksites is an effective way to protect workers against injury and near misses; (3) safety and health priorities and policies at the organisational level differ from those at the worker level, which contributes to workplace injury; and (4) reporting of safety concerns and near misses is influenced by injury severity.ConclusionsTemporary workers in the construction industry are familiar with near misses but have limited resources to protect themselves against potential health and safety hazards. These non-standard workers addressed unique barriers to staying safe at work and identified potential improvements.
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Jónsdóttir, Kristín, Ari Tryggvason, Roland Roberts, Bjoörn Lund, Heidi Soosalu et Reynir Böðvarsson. « Habits of a glacier-covered volcano : seismicity patterns and velocity structure of Katla volcano, Iceland ». Annals of Glaciology 45 (2007) : 169–77. http://dx.doi.org/10.3189/172756407782282499.
Texte intégralRésumé :
AbstractThe Katla volcano, overlain by the Mýrdalsjökull glacier, is one of the most active and hazardous volcanoes in Iceland. Earthquakes show anomalous magnitude-frequency behaviour and mainly occur in two distinct areas: within the oval caldera and around Goðabunga, a bulge on its western flank. The seismicity differs between the areas; earthquakes in Goðabunga are low frequency and shallow whereas those beneath the caldera occur at greater depths and are volcano-tectonic. The seismicity shows seasonal variations but the rates peak at different times in the two areas. A snow budget model, which gives an estimate of the glacial loading, shows good correlation with seismic activity on an annual scale. Data recorded by the permanent network South Iceland Lowland (SIL), as well as by a temporary network, are used to invert for a 3D seismic velocity model underneath Eyjafjallajökull, Goðabunga and the Katla caldera. The tomography resolves a 15 km wide, aseismic, high-velocity structure at a depth of more than 4 km between the Eyjafjallajökull volcano in the west and the Katla volcano in the east. Anomalously low velocities are observed beneath the Katla caldera, which is interpreted as being a significantly fractured area of anomalously high temperature.
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Usoltseva, Olga, et Elena Kozlovskaya. « Studying local earthquakes in the area Baltic-Bothnia Megashear using the data of the POLENET/LAPNET temporary array ». Solid Earth 7, no 4 (18 juillet 2016) : 1095–108. http://dx.doi.org/10.5194/se-7-1095-2016.
Texte intégralRésumé :
Abstract. Earthquakes in areas within continental plates are still not completely understood, and progress on understanding intraplate seismicity is slow due to a short history of instrumental seismology and sparse regional seismic networks in seismically non-active areas. However, knowledge about position and depth of seismogenic structures in such areas is necessary in order to estimate seismic hazard for such critical facilities such as nuclear power plants and nuclear waste deposits. In the present paper we address the problem of seismicity in the intraplate area of northern Fennoscandia using the information on local events recorded by the POLENET/LAPNET (Polar Earth Observing Network) temporary seismic array during the International Polar Year 2007–2009. We relocate the seismic events using the program HYPOELLIPS (a computer program for determining local earthquake hypocentral parameters) and grid search method. We use the first arrivals of P waves of local events in order to calculate a 3-D tomographic P wave velocity model of the uppermost crust (down to 20 km) for a selected region inside the study area and show that the velocity heterogeneities in the upper crust correlate well with known tectonic units. We compare the position of the velocity heterogeneities with the seismogenic structures delineated by epicentres of relocated events and demonstrate that these structures generally do not correlate with the crustal units formed as a result of crustal evolution in the Archaean and Palaeoproterozoic. On the contrary, they correlate well with the postglacial faults located in the area of the Baltic-Bothnia Megashear (BBMS). Hypocentres of local events have depths down to 30 km. We also obtain the focal mechanism of a selected event with good data quality. The focal mechanism is of oblique type with strike-slip prevailing. Our results demonstrate that the Baltic-Bothnia Megashear is an important large-scale, reactivated tectonic structure that has to be taken into account when estimating seismic hazard in northern Fennoscandia.
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Sednev, V. A. « Justification of the power supply system for life support of rescue units and the injured population during field deployment ». Technology of technosphere safety 92 (2021) : 142–55. http://dx.doi.org/10.25257/tts.2021.2.92.142-155.
Texte intégralRésumé :
Introduction. Increasing of number, scale and duration of the consequences of emergency situations associated with the violation of the conditions of normal living of people requires the creation of temporary field accommodation points for the affected population and rescue units. At the same time, electric power supply in field temporary accommodation facilities plays a crucial role in the complex of tasks and measures aimed at providing life to the injured population and rescue units. At the same time, there are no mobile autonomous sources of electric energy for providing life support to people in the field in the organizational and staff structure of rescue units, and the existing sources of electric energy in the complexes of equipment used in areas of emergency situations cannot be used for these purposes. Therefore, it is necessary to develop a scientific and methodological approach to determine necessary and sufficient number of sources of electric energy for the power supply of the life support of the injured population and rescue units when they are placed in field temporary accommodation points. The purpose of the study. Electric power supply of field temporary accommodation points for the injured population and rescue units, ensuring the required reliability of electric power supply, maximizing its efficiency in the conditions of possible resource constraints and minimizing the influence of the uncertainty factor in the planning of electricity consumption. Research methods. The main provisions of the calculation of electrical loads, system theory, set theory, probability theory and the apparatus of mathematical statistics. The results of the study. A methodology has been developed that allows to justify the power of electric energy sources for the power supply of field temporary accommodation points for the injured population and rescue units, rational options for the power supply system, the nomenclature and number of electric energy sources for the life support of people in the field; to calculate the electric network; to evaluate the operation of the power supply system, based on the probability of failure-free operation of the source of electric energy; to justify the composition of engineering means to ensure the creation of the power supply system. Conclusion. The scientific and methodological approach for determining the composition of electric energy sources for the power supply of life support for the injured population and rescue units when they are placed in field temporary accommodation points is justified, which also allows to resolve the contradiction between the need to organize the power supply of life support for people in temporary accommodation points and the lack of a reasonable structure of electric energy sources for these purposes. Keywords: temporary accommodation point, injured population, rescue formation, consumers, electric power supply, organization
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Zhao, Chen-Yu, Ren-Hui Yue, Yu-Liang Lin, Cong-Jun Huang et Xu Jiang. « Investigation on Deformation Behavior of the Crossing Section of Two Municipal Road Tunnels during Construction ». Applied Sciences 12, no 23 (30 novembre 2022) : 12274. http://dx.doi.org/10.3390/app122312274.
Texte intégralRésumé :
With the development of urbanization, the transportation network of underground tunnels has been gradually formed and improved. It is a complicated issue for engineering construction when two municipal road tunnels intersect at one point. Based on a construction site of the crossing point of the Huayuan Road Tunnel and Luzhou Road Tunnel in Hefei City, China, the finite element analysis method is used to calculate and analyze the deformation characteristics of the crossing point of the tunnels during the asymmetric construction of connecting parts. The deformation behaviors of the crossing point of tunnels subjected to symmetrical construction are also studied for comparison. Results show that the deformations of the supporting pile and tunnel frame structures increase rapidly when they are subjected to asymmetric construction, while the lateral movement of the supporting pile and the deformation of the tunnel structure can be greatly limited when the symmetrical construction method is adopted. Some suggestions for engineering construction are put forward to ensure the safety of the structure, such as multi-stage construction and temporary supporting measure.
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Yermoshyn, M., A. Poberezhnyi, O. Onopriyenko et M. Shuryha. « Architecture of network knowledge base of a complex military system ». Radiotekhnika, no 204 (9 avril 2021) : 80–92. http://dx.doi.org/10.30837/rt.2021.1.204.09.
Texte intégralRésumé :
The article examines the architecture of a networked knowledge base and the organizational structure of a complex military-purpose system, which is built when a group of troops (forces) is created and kept in a state where it is capable of solving the tasks assigned to it. This requires a deep study of issues not only of modern tactics regarding the preparation and conduct of hostilities, but also more complex issues of scientific substantiation of the architecture of a networked knowledge base and the structure of a complex military system with a networked knowledge base. The internal representation of knowledge in the knowledge base (formal programmatic and logical content) is advisable to implement in the form of an adjacency matrix, which displays the relationship and relationship between target settings; initial conditions; the resources of the grouping of troops (temporary, material, combat and quantitative composition), their costs and replenishment; rules for the use of resources and the choice of criteria for their distribution. The knowledge base synthesizes a mathematical network model for making decisions, which provides a change (correction) of the structure of target attitudes when replenishing the knowledge base. Tasks solved in the knowledge base: selection of vertices and relations when replenishing catalogs; making changes to the adjacency matrix in accordance with the identified or changed relationships between targets. A necessary element of the synthesis of a mathematical network model for making decisions on the preparation and conduct of hostilities is the construction of the structure of the target systems of the system for a specific situation. A feature of controlling the correctness of knowledge presented in the form of target attitudes is the need for a joint analysis of the entire set of target attitudes and initial conditions in their relationship. For this, the matrix of the relations of target attitudes and the matrix of the relations of initial conditions are combined. The control of the correctness of the knowledge base is carried out when replenishing the knowledge base, it includes: identification of contradictions in the structure of target attitudes when making changes to this structure; search and detection of contradictions in the graph of the semantic network according to available resources and time; checking the completeness of the graph of the mathematical network model; issuance of revealed contradictions to an expert and their elimination. A practical approach to building the architecture of a networked knowledge base and the organizational structure of a complex military system can be implemented during the substantiation of the components and elements of the system when creating a grouping of troops (forces).
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Bock, Thomas, Angelika Schmid et Sven Apel. « Measuring and Modeling Group Dynamics in Open-Source Software Development : A Tensor Decomposition Approach ». ACM Transactions on Software Engineering and Methodology 31, no 2 (30 avril 2022) : 1–50. http://dx.doi.org/10.1145/3473139.
Texte intégralRésumé :
Many open-source software projects depend on a few core developers, who take over both the bulk of coordination and programming tasks. They are supported by peripheral developers, who contribute either via discussions or programming tasks, often for a limited time. It is unclear what role these peripheral developers play in the programming and communication efforts, as well as the temporary task-related sub-groups in the projects. We mine code-repository data and mailing-list discussions to model the relationships and contributions of developers in a social network and devise a method to analyze the temporal collaboration structures in communication and programming, learning about the strength and stability of social sub-groups in open-source software projects. Our method uses multi-modal social networks on a series of time windows. Previous work has reduced the network structure representing developer collaboration to networks with only one type of interaction, which impedes the simultaneous analysis of more than one type of interaction. We use both communication and version-control data of open-source software projects and model different types of interaction over time. To demonstrate the practicability of our measurement and analysis method, we investigate 10 substantial and popular open-source software projects and show that, if sub-groups evolve, modeling these sub-groups helps predict the future evolution of interaction levels of programmers and groups of developers. Our method allows maintainers and other stakeholders of open-source software projects to assess instabilities and organizational changes in developer interaction and can be applied to different use cases in organizational analysis, such as understanding the dynamics of a specific incident or discussion.
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STRZELECKI, MICHAŁ, JACEK KOWALSKI, HYONGSUK KIM et SOOHONG KO. « A NEW CNN OSCILLATOR MODEL FOR PARALLEL IMAGE SEGMENTATION ». International Journal of Bifurcation and Chaos 18, no 07 (juillet 2008) : 1999–2015. http://dx.doi.org/10.1142/s0218127408021506.
Texte intégralRésumé :
Segmentation of the textured images into disjoint homogeneous regions is a very important aspect of visual perception. The texture represents properties of visualized objects; it may provide information about their structure. One of the recently developed tools used for texture segmentation is a network of synchronized oscillators. A parallel network operation is based on a "temporary correlation" theory, which attempts to explain scene recognition as performed by the human brain. This theory states that the synchronized oscillations of neuron groups attract attention if it is focused on a coherent stimulus (image object). For more than one perceived stimulus, these synchronized patterns switch in time between different neuron groups, thus forming temporal maps coding several features of the analyzed scene. Consequently, to implement this theory, a new oscillator network was proposed for image segmentation. The segmentation is obtained due to local interactions among neighboring cells. Such a network was successfully used for segmentation of the wide range of different images, including textured and biomedical ones. The network is very suitable for a hardware realization owing to its parallel structure. The realization provides a much faster image segmentation when compared to computer simulation techniques. The paper presents a new mathematical oscillator model suitable to be implemented in a CNN network chip. The model was used to design and simulate a CMOS oscillator circuit, which enables parallel network operation. The proposed oscillator model was analyzed and discussed from the point of view of its computer simulations. Furthermore, it was demonstrated that the oscillator network which implements the presented model is able to perform segmentation of the sample textured images. Oscillator circuit and block diagram of the proposed network chip were also presented and discussed.
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Evstratenko, Anzhelika V. « Typological features and prospective lines of development of roadside service facilities in Belarus ». Vestnik MGSU, no 8 (août 2019) : 940–53. http://dx.doi.org/10.22227/1997-0935.2019.8.940-953.
Texte intégralRésumé :
Introduction: the methods of roadside service network development implemented in Belarus were identified. Structure, architectural and spatial solutions, and general functional zoning of a service facility territory were considered for the roadside service facilities located along Belarus main motor roads. The study aims at the revelation of typological features of roadside service network elements in Belarus and their structure-based classification as well as the development of the main provisions on the formation of these facilities based on the current situation analysis and prospective lines of building up a service system in the areas of influence of national importance roads.
Materials and methods: the work was carried out through systematization, structural and comparative analyses, theoretical synthesis of the data obtained from the detailed analysis of literature and statistical sources, field surveys of roadside service facilities located along the national-importance roads in Belarus. Likewise design estimation documentation for the constructed facilities was applied. During the field surveys, photo fixation and graph-analytic analysis methods were used.
Results: the article suggests the classification of roadside service facilities, reveals the methods of network development, considers functional zoning and offers a concept of prospective formation of the facilities in Belarus.
Conclusions: theoretical and methodological foundations of the facility formation were developed, which allows accomplishing more reasonable and objective decisions regarding the development of the roadside service network. The developed classification allows defining new approaches to the formation of the network individual elements. The suggested concept of a modular system for the prospective formation of the roadside service in Belarus can form a basis for the initial build-up and temporary transformation of the facilities and the system as a whole and can be used to develop regulatory requirements for their planning structure and architectural and spatial solution.
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De Melo, Hiran, Raimundo C. S. Freire, José F. Da Silva, José H. F. Cavalcanti et Alessio T. Barros. « CAPES/PROCAD Intelligent Forecast System Applied to the Identification of Parameters in Flexible Structures ». Journal of Vibration and Control 11, no 2 (février 2005) : 201–14. http://dx.doi.org/10.1177/1077546305049483.
Texte intégralRésumé :
The Intelligent Forecast System (IFS) consists of three units: the main unit is a multilayer neural network; the second unit is based on fuzzy logic, which is used to prepare the data; and the third unit is based on a genetic algorithm and is used to determine the best set of data to be analyzed. The data were set up by using a strategy that classifies the terms of the series into parts with the same quantity of elements. Each part is called a window. The IFS was trained by using a group of windows, which is called a set of training windows. Next, the IFS was applied to solve several problems related to the evaluation of structural integrity. The IFS was applied as an identification strategy and forecast of parameters in a flexible structure. Additionally, by using the IFS we have developed a new strategy to analyze the temporary series obtained from vibrations of flexible structures with the distribution of variable mass. The results obtained in this research, using the IFS applied as an identification strategy and forecast of parameters in a flexible structure, show the effectiveness of the IFS.
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Li, Haiou, Xiwei Xu, Wentao Ma, Ronghua Xie, Jingli Yuan et Changpeng Xu. « Seismic Structure of Local Crustal Earthquakes beneath the Zipingpu Reservoir of Longmenshan Fault Zone ». International Journal of Geophysics 2011 (2011) : 1–6. http://dx.doi.org/10.1155/2011/407673.
Texte intégralRésumé :
Three-dimensional P wave velocity models under the Zipingpu reservoir in Longmenshan fault zone are obtained with a resolution of 2 km in the horizontal direction and 1 km in depth. We used a total of 8589 P wave arrival times from 1014 local earthquakes recorded by both the Zipingpu reservoir network and temporary stations deployed in the area. The 3-D velocity images at shallow depth show the low-velocity regions have strong correlation with the surface trace of the Zipingpu reservoir. According to the extension of those low-velocity regions, the infiltration depth directly from the Zipingpu reservoir itself is limited to 3.5 km depth, while the infiltration depth downwards along the Beichuan-Yingxiu fault in the study area is about 5.5 km depth. Results show the low-velocity region in the east part of the study area is related to the Proterozoic sedimentary rocks. The Guanxian-Anxian fault is well delineated by obvious velocity contrast and may mark the border between the Tibetan Plateau in the west and the Sichuan basin in the east.
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Martens, Hilary R., Robert S. White, Janet Key, Julian Drew, Heidi Soosalu et Steinunn S. Jakobsdóttir. « Dense seismic network provides new insight into the 2007 Upptyppingar dyke intrusion ». Jökull 60, no 1 (15 décembre 2010) : 47–66. http://dx.doi.org/10.33799/jokull2010.60.047.
Texte intégralRésumé :
Factors such as network geometry, network size and phase-picking accuracy have significant effects on the precision of seismic hypocentre locations. In turn, the precision of the hypocentral locations dictates the degree to which morphological details within seismic swarms may be resolved. The Icelandic national seismic network (SIL) is designed to monitor seismic activity across large expanses of Iceland in real-time using automated earthquake detection and location software. Here we examine the performance of the SIL network relative to a much denser, local network of seismometers deployed around the Askja volcano in the Northern Volcanic Zone. A subset of earthquakes from the 2007–2008 dyke intrusion beneath Mt. Upptyppingar is used to compare single- and multi-event hypocentral locations. Specifically, we highlight 288, high signal-to-noise ratio events that occurred during an intensive sequence of earthquakes from 6–24 July 2007, when the temporary Askja network was active. A careful refinement of phase onsets recorded by our well-configured, dense network of receivers reveals hypocentres clustered tightly on a planar structure, interpreted as a dyke dipping at 49°. The root-mean-square (RMS) misfit to the plane (114 m) is only slightly greater than the uncertainties in relative locations of the earthquakes themselves, and constitutes a three-fold reduction in RMS misfit over SIL relative locations. The improved precision, facilitated predominantly by a more favourable network size and configuration, permits a more detailed analysis of the intrusion.
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Alotaibi, Shoayee Dlaim, Kusum Yadav, Arwa N. Aledaily, Lulwah M. Alkwai, Alaa Kamal Yousef Dafhalla, Shahad Almansour et Velmurugan Lingamuthu. « Deep Neural Network-Based Intrusion Detection System through PCA ». Mathematical Problems in Engineering 2022 (9 mai 2022) : 1–9. http://dx.doi.org/10.1155/2022/6488571.
Texte intégralRésumé :
Today, challenges such as a high false-positive rate, a low detection rate, a slow processing speed, and a big feature dimension are all part of intrusion detection. To address these issues, decision trees (DTs), deep neural networks (DNNs), and principal component analysis (PCA) are available. Through a higher detection rate and a lower false-positive rate, the research-based intrusion detection model DT-PCA-DNN increases the processing speed of intrusion detection systems (IDSs). To minimize the overall data volume and accelerate processing, DT is used to initially differentiate the data. Differentiate DTs save the temporary training sample set for intrusion data in order to retrain and optimize the DT and DNN, treat the DT judges as standard data, and delete the added average data. After signing, we should lower the dimension of the data using PCA and then submit the data to DNN for secondary discrimination. However, DT employs a shallow structure in order to prevent an excessive quantity of average numbers from being interpreted as intrusion data. As a result, additional DNN secondary processing cannot effectively increase the accuracy. DNN accelerates data processing by utilizing the ReLU activation function from the simplified neural network calculation approach and the faster convergence ADAM optimization algorithm. Class two and five trials on the NSL-KDD dataset demonstrate that the proposed model is capable of achieving high detection accuracy when compared to other deep learning-based intrusion detection approaches. Simultaneously, it has a faster detection rate, which effectively solves the real-time intrusion detection problem.
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Guéguen, Philippe, Frédéric Guattari, Coralie Aubert et Theo Laudat. « Comparing Direct Observation of Torsion with Array-Derived Rotation in Civil Engineering Structures ». Sensors 21, no 1 (28 décembre 2020) : 142. http://dx.doi.org/10.3390/s21010142.
Texte intégralRésumé :
In this article, we analyze the rotation rates in a building derived from a network of translation sensors and recorded by a rotation sensor. The building is Grenoble city hall, a reinforced concrete structure with permanent accelerometric translation sensors at the top and bottom of the building. A temporary experiment was conducted, consisting in installing a BlueSeis-3A rotation sensor for more than 24 h at the top of the structure. The ambient vibrations were analyzed. The amplitudes of translation accelerations and rotation rates at the top and bottom of the building, along with their variations over time, were analyzed. The acceleration/rotation ratios were then compared with the impulse wave velocities derived from seismic interferometry by deconvolution between the top and bottom. Perspectives with regard to building imaging, time monitoring of structural integrity and understanding the contribution of rotations to the structure’s response are discussed, offering new suggestions for research projects.
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Perez, Alondra B. A., Camyla Innocente dos Santos, João H. M. Sá, Pedro F. Arienti et Pedro L. B. Chaffe. « Connectivity of Ephemeral and Intermittent Streams in a Subtropical Atlantic Forest Headwater Catchment ». Water 12, no 6 (27 mai 2020) : 1526. http://dx.doi.org/10.3390/w12061526.
Texte intégralRésumé :
Stream network extension and contraction depend on landscape features and the characteristics of precipitation events. Although this dependency is widely recognized, the interaction among overland-flow generation processes, drainage active length, and frequency in temporary streams remains less understood. We studied a forest headwater catchment with wide variation in soil depth to investigate the runoff generation processes that lead to the occurrence of ephemeral and intermittent flow and connectivity between hillslope and outlet. We used low-cost equipment to monitor the variation in the length of the active drainage network and to measure the water table development. The flow in the channels can develop even under light rainfall conditions, while the connectivity is controlled by antecedent wetness, total precipitation, and active contribution area thresholds. Runoff permanence and fragmentation were related to soil depth variation; flow being usually more disconnected due to deeper water tables in deeper soil locations. Our findings emphasized the impact of soil structure on runoff generation in hillslopes and can be useful in the management of the most active areas and their impact on the quality of available water.
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Sabyraliev, M., et Zh Sulaimanov. « The Use of Porous Nickel Titanium Implants in Anterior Spinal Fusion of the Lumbar Spine ». Bulletin of Science and Practice 5, no 11 (15 novembre 2019) : 92–96. http://dx.doi.org/10.33619/2414-2948/48/12.
Texte intégralRésumé :
Back pain affects approximately 80% of the adult population. In the structure of the nervous system morbidity, cases of osteochondrosis account for up to 68%, reaching 72% of the days of temporary disability in the outpatient network and 48% in hospitals. Since 2004, surgical interventions using porous nickel titanium have been performed in the Department of Spinal Pathology in 43 patients with degenerative lesions of the lumbar spine. Of these, 23 were men and 20 women. At the age of 20 to 65 years (average age 46.1 years). In the postoperative period, a significant regression of pain intensity in the lumbar region and lower extremities was determined in 8 (18.6%) patients, and the complete disappearance of pain was determined in the remaining 35 (81.4%) patients. Before surgery, the Oswestry index averaged 48.3%, after surgery 13.4%.
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Ustavich, Georgij A., Nikolay S. Kosarev, Dmitriy A. Barannikov, Ivan A. Mezentsev et Dmitriy V. Birukov. « METHOD OF TRANSMITTING THE COORDINATES OF THE TOTAL STATION TO THE POINTS OF THE INTERNAL CENTRAL NETWORK OF AN ENGINEERING CONSTRUCTION ». Vestnik SSUGT (Siberian State University of Geosystems and Technologies) 26, no 5 (2021) : 52–62. http://dx.doi.org/10.33764/2411-1759-2021-26-5-52-62.
Texte intégralRésumé :
When creating an external planning and high-altitude justification on construction sites, and then internal center networks for the purpose of transmitting coordinates in a number of cases, geodetic measurements are performed through an optical medium, which in some areas has a different refractive index. This is the case when performing such measurements in the winter season, when the trans-mission is made through the technological gate of the temporary end of an engineering structure, for example, a nuclear or thermal power plant. The disadvantage of this method is the influence of significant air turbulence at the border of a sharp temperature drop in winter. To eliminate this influence, it is proposed to transmit coordinates inside the engineering structure through window openings. In this case, the total station can be located inside the engineering structure or outside it. When implementing the proposed method, the influence of a sharp temperature drop on the measurement results is almost completely excluded. Studies have established that when the coordinates are transmitted through the glass to the points of internal justification, a parallel transfer of the sighting beam occurs. To exclude it, the sighting must be performed at the horizontal position of the total station telescope. The article presents the results of studies of the accuracy of measuring distances and angles when the sighting (laser) beam of the total station passes through two optical media (air-glass-air) at different air temperature differences.
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Galanis, O. C., C. B. Papazachos, P. M. Hatzidimitriou et E. M. Scordilis. « APPLICATION OF 3-D VELOCITY MODELS AND RAY TRACING IN DOUBLE DIFFERENCE EARTHQUAKE LOCATION ALGORITHMS : APPLICATION TO THE MYGDONIA BASIN (NORTHERN GREECE) ». Bulletin of the Geological Society of Greece 36, no 3 (1 janvier 2004) : 1396. http://dx.doi.org/10.12681/bgsg.16508.
Texte intégralRésumé :
In the past years there has been a growing demand for precise earthquake locations for seismotectonic and seismic hazard studies. Recently this has become possible because of the development of sophisticated location algorithms, as well as hardware resources. This is expected to lead to a better insight of seismicity in the near future. A well-known technique, which has been recently used for relocating earthquake data sets is the double difference algorithm. In its original implementation it makes use of a one-dimensional ray tracing routine to calculate seismic wave travel times. We have modified the implementation of the algorithm by incorporating a three-dimensional velocity model and ray tracing in order to relocate a set of earthquakes in the area of the Mygdonia Basin (Northern Greece). This area is covered by a permanent regional network and occasionally by temporary local networks. The velocity structure is very well known, as the Mygdonia Basin has been used as an international test site for seismological studies since 1993, which makes it an appropriate location for evaluating earthquake location algorithms, with the quality of the results depending only on the quality of the data and the algorithm itself. The new earthquake locations reveal details of the area's seismotectonic structure, which are blurred, if not misleading, when resolved by standard (routine) location algorithms.