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Journal articles on the topic 'Lifetime structural node'
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1
Yao, Peng, Gang Liu, and Yan Liu. "Critical Event-Triggered Transmission for Wireless Sensor Node in Aircraft Structural Health Monitoring." Applied Mechanics and Materials 599-601 (August 2014): 856–59. http://dx.doi.org/10.4028/www.scientific.net/amm.599-601.856.
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The wireless sensor network represents an exciting development that has the potential to be integrated into an aircraft environment for structural health monitoring. Critical event-triggered transmission scheme were illustrated and applied to prolong the battery lifetime and balance the power-performance tradeoff. The experimental results show that the wireless sensor node using this technology is a powerful solution for aircraft SHM.
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Haque, Md Ershadul, Md Asikuzzaman, Imran Ullah Khan, In-Ho Ra, Md Sanwar Hossain, and Syed Bilal Hussain Shah. "Comparative Study of IoT-Based Topology Maintenance Protocol in a Wireless Sensor Network for Structural Health Monitoring." Remote Sensing 12, no. 15 (July 23, 2020): 2358. http://dx.doi.org/10.3390/rs12152358.
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A structural health monitoring (SHM) system is an approach for identifying the damages caused to various kinds of structures using different system functions and providing the necessary feedback about structure’s conditions. As civil structures are the backbone of our society, to determine its daily operations is a very important issue. The performance measurement of those structures is manual whereas a computer-based monitoring system could automatically assess the structural damages and identify its exact location. Recently, wireless sensor networks (WSNs) have attracted a great deal of attention for remote sensing applications due to flexibility to measure of various activity of large scale network. Since technology is advancing day by day, the overall cost of a monitoring system is also decreased. However, the major challenging fact of a WSNs is to provide scalability for covering a large area. The main question is arisen how much capable have of a monitoring system to turn off unnecessary nodes to save energy while there are no events detected. To support the scalability required of an existing network and save the node energy for future use, we propose a topology maintenance protocol integrated with construction to address the issue of a node’s energy consumption by placing it optimally and extending the monitoring system’s lifetime. As per the authors’ acknowledgement that, a little attention has been paid to developing such a hybrid approach. To mitigate node energy consumption issue with large scale support, an Internet of Things (IoT)-based maintenance approach is the best candidate for obtaining better system lifetime responses. Therefore, the main goal of this work is to develop an ‘on-the-fly’-based topology maintenance monitoring system, which can maintain a network’s infrastructure while gathering a node’s information to switch its state regularly when the present network is no longer optimal.
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Feltrin, Glauco, Nemanja Popovic, and Michał Wojtera. "A Sentinel Node for Event-Driven Structural Monitoring of Road Bridges Using Wireless Sensor Networks." Journal of Sensors 2019 (January 31, 2019): 1–16. http://dx.doi.org/10.1155/2019/8652527.
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Event-driven monitoring policies enable to significantly reduce the power consumption of wireless sensor networks by reducing the recording period to those time intervals that provide valuable data. The resulting longer operation lifetime increase discloses fields of application that require long monitoring periods. This paper presents a structural monitoring system that uses specialized sentinel nodes for detecting possibly heavy road vehicles and for alarming monitoring nodes, which are specialized on strain sensing. Heavy vehicles are identified by estimating nearly in real time height and length of vehicles of a traffic flow by processing data recorded from low-cost ultrasonic and magnetic displacement sensors. Field tests demonstrated that while height detection is very reliable, length detection is too imprecise to discriminate with high success rates between trucks and delivery vans.
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RYNIEWICZ, Anna M., Tomasz MADEJ, Wojciech RYNIEWICZ, Łukasz BOJKO, and Mieczysław CHOROMAŃSKI. "THE EFFECT OF THE COEFFICIENT OF FRICTION ON THE BIOMECHANICS OF CONTACT IN HIP ENDOPROSTHESIS." Tribologia 273, no. 3 (June 30, 2017): 137–46. http://dx.doi.org/10.5604/01.3001.0010.6245.
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Hip replacement surgery, by introducing a specific replacement head on the stem and cup, completely changes the conditions of co-operation typical for the biological correct pair. The clinical selection of endoprosthesis, apart from other conditionings, involves a dilemma between the choice of a rigid tribological node and the selection of a susceptible bearing cushioning the locomotive loads. The aim of the study is to evaluate the coefficient of friction and wear resistance of materials used for sliding contact in the endoprostheses of hip joints. On the basis of the conducted tests, it can be stated that, in the selection of material for cups of endoprosthesis, the wear resistance is important, and the coefficient of friction in contact head and cup in the prosthesis is less important. The presence of significant disproportions between the two parameters of the tribological process proves that the biomaterial is less useful on the cup. In the assessment of cooperation in the endoprosthesis, simulations of the contact of structural elements are useful, because, on that basis, in the correlation with tribological parameters, one can make conclusions about the distribution of stresses and displacements that may determine the lifetime of the implant.
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Et. al., Mr Pradeep K. G. M. "Energy Efficient Scheduling Algorithm for Structural Health Building Monitoring System(Shbm) to Increase the Battery Lifetime." Turkish Journal of Computer and Mathematics Education (TURCOMAT) 12, no. 3 (April 11, 2021): 5005–12. http://dx.doi.org/10.17762/turcomat.v12i3.2014.
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A structural health building monitoring system is invented, achieved and attempted using Wireless Sensor Networks .Ambient vibration of the structure is audited and is implemented to identify the health status of the structure. With WSN, low cost monitoring is possible without intruding with the action of the structure. In this cluster head is heavily loaded since it gathers information from all other member nodes and integrate then and forward to sink either directly or through intermediate other cluster head. I near future cluster head drain and we need to select another cluster head via re clustering. The re clustering also led to energy loss to select the cluster head based on weight age value.WSN consumes less power and it is used to track slow targets .WSNs covers only small distance. WSN has high failure rate and we have to plant excessive nodes. Hence redundant nodes dissipate more power. To avoid this, sleep mode and scheduling algorithm is used in this paper. The objective of the paper is to design a scheduling algorithm to trace data with target rate. The proposed scheme is a kind of an adaptive/Cyclic on–off scheduling scheme in where sensors nodes use only local information to make scheduling decisions.
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Hajduk, A. "The past orbit of comet Halley and its meteor stream." International Astronomical Union Colloquium 83 (1985): 399–403. http://dx.doi.org/10.1017/s0252921100084086.
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AbstractThe present paper studies the structural features of the meteor streams associated with Comet Halley deduced from the observations of its meteor showers, as check points of orbital elements in a deeper history of the comet orbit. Libration of the argument of perihelion of the comet and the corresponding displacement of the nodes, as recognized in the distribution of condensations within the stream, allows to estimate the maximum lifetime of the comet in the inner Solar System at about 2 × 105 years.
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Colin, Xavier, Mouna Ben Hassine, and Moussa Nait-Abelaziz. "CHEMO-MECHANICAL MODEL FOR PREDICTING THE LIFETIME OF EPDM RUBBERS." Rubber Chemistry and Technology 92, no. 4 (October 1, 2019): 722–48. http://dx.doi.org/10.5254/rct.19.81469.
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ABSTRACT A chemo-mechanical model has been developed for predicting the long-term mechanical behavior of EPDM rubbers in a harsh thermal oxidative environment. Schematically, this model is composed of two complementary levels: The “chemical level” calculates the degradation kinetics of the macromolecular network that is introduced into the “mechanical level” to deduce the corresponding mechanical behavior in tension. The “chemical level” is derived from a realistic mechanistic scheme composed of 19 elementary reactions describing the thermal oxidation of EPDM chains, their stabilization against oxidation by commercial antioxidants but also by sulfide bridges, and the maturation and reversion of the macromolecular network. The different rate constants and chemical yields have been determined from a heavy thermal aging campaign in air between 70 and 170 °C on four distinct EPDM formulations: additive free gum, unstabilized and stabilized sulfur vulcanized gum, and industrial material. This “chemical level” has been used as an inverse resolution method for simulating accurately the consequences of thermal aging at the molecular (concentration changes in antioxidants, carbonyl products, double bonds, and sulfide bridges), macromolecular (concentration changes in chain scissions and cross-link nodes), and macroscopic scales (weight changes). Finally, it gives access to the concentration changes in elastically active chains from which are deduced the corresponding changes in average molar mass MC between two consecutive cross-link nodes. The “mechanical level” is derived from a modified version of the statistical theory of rubber elasticity, called the phantom network theory. It relates the elastic and fracture properties to MC if considering the macromolecular network perfect, and gives access to the lifetime of the EPDM rubber based on a relevant structural or mechanical end-of-life criterion. A few examples of simulations are given to demonstrate the reliability of the chemo-mechanical model.
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Dhage, Manisha R., and Srikanth Vemuru. "Routing Design Issues in Heterogeneous Wireless Sensor Network." International Journal of Electrical and Computer Engineering (IJECE) 8, no. 2 (April 1, 2018): 1028. http://dx.doi.org/10.11591/ijece.v8i2.pp1028-1039.
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<p class="Default">WSN has important applications such as habitat monitoring, structural health monitoring, target tracking in military and many more. This has evolved due to availability of sensors that are cheaper and intelligent but these are having battery support. So, one of the major issues in WSN is maximization of network life. Heterogeneous WSNs have the potential to improve network lifetime and also provide higher quality networking and system services than the homogeneous WSN. Routing is the main concern of energy consumption in WSN. Previous research shows that performance of the network can be improve significantly using protocol of hierarchical HWSN. However, the appropriateness of a particular routing protocol mainly depends on the capabilities of the nodes and on the application requirements. This study presents different aspects of Heterogeneous Wireless Sensor network and design issues for routing in heterogeneous environment. Different perspectives from different authors regarding energy efficiency based on resource heterogeneity for heterogeneous wireless sensor networks have been presented.</p>
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Zlatuška, Karel, Jiří Stráským, and Radim Nečas. "Spatially Curved Cable-Supported Bridge Structures." Solid State Phenomena 259 (May 2017): 125–29. http://dx.doi.org/10.4028/www.scientific.net/ssp.259.125.
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The article is focused on the design of spatially curved cable - supported footbridges, which represent a simple and elegant solution for bridging longer spans. It can be used independently or in a combination with other structural arrangements, e.g. with the arch structures.To verify the behavior of the structure, a several testing models were created. At first only simple, plan – straight models were created so the results could be checked by manual calculations. Latter, the more complex, curved models were tested. All models were designed and analyzed with the Ansys software using geometrically nonlinear calculations. The analysis consisted in the searching for ideal geometry of the supporting cable, cross section geometry of the bridge deck and other parameters, which are necessary to find a correct initial state of the structure. The main criterion for finding the initial state was a demand of minimal deformations in the strut - supporting nodes, which leads to the minimal redistribution of the internal forces during the design lifetime. The result of the paper is a detailed analysis of the construction’s behavior. The main emphasis is on methodology of search for the initial state. Further, the buckling analysis of the struts and cable were performed and it’s resistance to buckling was determined using various live load configurations.
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Srikanth*, P., S. Pallam Shetty, and K. Venkata Krishna R. "Taguchi Approach for Determining the Most Essential Aspect in Enhancing the RPL Performance." International Journal of Innovative Technology and Exploring Engineering 10, no. 10 (August 30, 2021): 59–63. http://dx.doi.org/10.35940/ijitee.j9412.08101021.
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Wireless Networks to support real time communication is a challenging issue due to limited bandwidth and limited energy. Internet a best-effort model with IPv4 have complication in handling the limited network connections. To prune the network connection problem IPv6 a QoS model has been incorporated. IPv6 implementation using internet over various devices/things connected wirelessly is Internet Of Things(IOT). RPL a routing protocol best suits for IOT communication needs to implement best effort model with ICMP highly adaptable for IPv4. A series of experiments have been conducted on Cooja simulator to analyse for enhancement for QoS parameters metric on RPL Routing Protocol. The experimental results yields that no of nodes, Tx Ratio, ICMP intervals and ICMP interval are four factor having an remarkable influence on the QoS Metric of RPL routing protocol. A Design of experiments have been conducted to an optimum level using the Taguchi approach to pick out the most influential factor among the four factors. Taguchi experimental analysis revealed that ICMP time interval as most significant factor for QoS metric in RPL routing protocol for minimizing the energy consumption and enhancing the network lifetime.
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Yoon, Seung Wook, Yaojian Lin, Yonggang Jin, Jerome Teysseyre, Xavier Baraton, and Pandi C. Marimuthu. "Next Generation eWLB (Embedded Wafer Level BGA): Advanced 3D SiP Packaging Solution." Additional Conferences (Device Packaging, HiTEC, HiTEN, and CICMT) 2012, DPC (January 1, 2012): 001507–26. http://dx.doi.org/10.4071/2012dpc-wa22.
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Current and future demands of mobile/portable electronic systems in terms of performance, power consumption, reliable system at a reasonable price are met by developing advanced/appropriate silicon process technology, innovative packaging solutions with use of chip-package-system co-design, low cost materials, advanced assembly and reliable interconnect technologies. In this article packaging evolution for hand held application is discussed with special focus on next generation chip embedding technology called eWLB in detail. To meet the above said challenges eWLB was developed which offers additional space for routing higher I/O chips on top of Silicon chip area which is not possible in conventional WLP or WLB. It also offers comparatively better electrical, thermal and reliability performance at reduced cost with possibility to address more Moore [decreasing technology nodes with low-k dielectrics in SoC] and more than Moore [heterogeneous integration of chips with different wafer technology as SiP solution in multi die or 3D eWLB approaches]. Currently 1st generation eWLB technology is available in the industry with 200mm and 300mm carrier size. This paper will highlight some of the recent advancements in progress development and mechnical characterization in component level and board level reliaiblity of next generation eWLB technologies of double-side 3D eWLB. Standard JEDEC tests were carried out to investigate component level reliability and both destructive/non-destructive analysis was performed to investigate potential structural defects. Daisychain Test vehicles were prepared and also tested for drop and TcoB (Temperature on Board) reliaiblity in industry standard test conditions. There was significant improvement of characteristic lifetime with thined eWLB in TcoB performance because of its enhanced flexibility of package. And there was study of board level reliabiilty with underfill in SMT for large size eWLB packages. This paper will also present study of package warpage behavior with temperature profile as well as failure analysis with microsturctural observation for comprehensive understanding of mechanical behavior of next generation eWLBs.
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"Energy-efficient Dynamic Mobile Sink Path Planning for Data Acquisition for Wireless Sensor Networks." International Journal of Advanced Trends in Computer Science and Engineering 10, no. 3 (June 7, 2021): 1543–51. http://dx.doi.org/10.30534/ijatcse/2021/091032021.
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Wireless sensor networks (WSNs) are widely used in various applications such as defense, forest fire, healthcare,structural health monitoring, etc., because of itsflexibility, low cost and tiny. In WSNs, the sensor nodes are scattered over the target area to acquire the data from the environment and transmit it to the base station via single or multi-hop communication. Due to the sensor nodes' constrained battery, the sensor nodes near the base station are more involved in data transmissions. These relay nodes drain more energy and die soon, leading to a hotspot/energy-hole problem. Several algorithms have been proposed in the literature to address the hotspot problem using the mobile sink. However, most of the existing approaches are highlycomputational and also provide a static solutiononly. In this context, we proposed an energy-efficient dynamic mobile sink path construction with low computational complexity for data acquisition in WSNs. We use the minimum spanning tree-based clustering for selecting the data collection points and a computational geometry-based method to identify the visiting order of the data collection points by the mobile sink. Our proposed work is better than the existing approaches in terms of average energy consumption, network lifetime, fairness index, buffer utilization, etc.
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Collantoni, Enrico, Paolo Meneguzzo, Elena Tenconi, Valentina Meregalli, Renzo Manara, and Angela Favaro. "Shift Toward Randomness in Brain Networks of Patients With Anorexia Nervosa: The Role of Malnutrition." Frontiers in Neuroscience 15 (March 24, 2021). http://dx.doi.org/10.3389/fnins.2021.645139.
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No study to date investigated structural white matter (WM) connectome characteristics in patients with anorexia nervosa (AN). Previous research in AN found evidence of imbalances in global and regional connectomic brain architecture and highlighted a role of malnutrition in determining structural brain changes. The aim of our study was to explore the characteristics of the WM network architecture in a sample of patients with AN. Thirty-six patients with AN and 36 healthy women underwent magnetic resonance imaging to obtain a high-resolution three-dimensional T1-weighted anatomical image and a diffusion tensor imaging scan. Probabilistic tractography data were extracted and analyzed in their network properties through graph theory tools. In comparison to healthy women, patients with AN showed lower global network segregation (normalized clustering: p = 0.029), an imbalance between global network integration and segregation (i.e., lower small-worldness: p = 0.031), and the loss of some of the most integrative and influential hubs. Both clustering and small-worldness correlated with the lowest lifetime body mass index. A significant relationship was found between the average regional loss of cortical volume and changes in network properties of brain nodes: the more the difference in the cortical volume of brain areas, the more the increase in the centrality of corresponding nodes in the whole brain, and the decrease in clustering and efficiency of the nodes of parietal cortex. Our findings showed an unbalanced connectome wiring in AN patients, which seems to be influenced by malnutrition and loss of cortical volume. The role of this rearrangement in the maintenance and prognosis of AN and its reversibility with clinical improvement needs to be established by future studies.
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Kaur, Jasleen, Punam Rani, and Brahm Prakash Dahiya. "Hybrid artificial bee colony and glow worm algorithm for energy efficient cluster head selection in wireless sensor networks." World Journal of Engineering ahead-of-print, ahead-of-print (September 19, 2021). http://dx.doi.org/10.1108/wje-03-2021-0170.
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Purpose This paper aim to find optimal cluster head and minimize energy wastage in WSNs. Wireless sensor networks (WSNs) have low power sensor nodes that quickly lose energy. Energy efficiency is most important factor in WSNs, as they incorporate limited sized batteries that would not be recharged or replaced. The energy possessed by the sensor nodes must be optimally used so as to increase the lifespan. The research is proposing hybrid artificial bee colony and glowworm swarm optimization [Hybrid artificial bee colony and glowworm swarm optimization (HABC-GSO)] algorithm to select the cluster heads. Previous research has considered fitness-based glowworm swarm with Fruitfly (FGF) algorithm, but existing research was limited to maximizing network lifetime and energy efficiency. Design/methodology/approach The proposed HABC-GSO algorithm selects global optima and improves convergence ratio. It also performs optimal cluster head selection by balancing between exploitation and exploration phases. The simulation is performed in MATLAB. Findings The HABC-GSO performance is evaluated with existing algorithms such as particle swarm optimization, GSO, Cuckoo Search, Group Search Ant Lion with Levy Flight, Fruitfly Optimization algorithm and grasshopper optimization algorithm, a new FGF in the terms of alive nodes, normalized energy, cluster head distance and delay. Originality/value This research work is original.
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Garg, Rajesh Kumar, and Surender Kumar Soni. "Empirical path loss models at 433 MHz in Himalayan snow for health monitoring." World Journal of Engineering ahead-of-print, ahead-of-print (July 14, 2021). http://dx.doi.org/10.1108/wje-03-2021-0134.
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Purpose The purpose of this paper is to investigate the effect of snow on the radio link performance of wireless sensor nodes in Indian Himalayan conditions and to propose empirical path loss models for radio wave propagation. Design/methodology/approach At the remote test site, one source and three listening wireless sensor nodes were deployed at frequency of 433 MHz. The path loss models are derived from experimental data collected during the period of snowfall and clear weather conditions. Linear, exponential, second and third-order polynomials path loss models have been investigated along with experimental data. Findings With the help of curve fitting and goodness-of-fit tests, it is found that path loss can be modelled through third-order polynomial equation during the snowfall period. However, if sensor is buried, the acceptable path loss model is exponential. Similarly, for unified modelling requirement, exponential path loss model over linear can be a preferred choice. Originality/value Results show that path loss can be estimated priori for deciding optimum transmission energy in wireless sensor network. Presented work is usable in extending the lifetime of health monitoring devices buried in snowy environment.
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Troitskaya, L., and N. Malahova. "Cognitive Function Estimation in Children with Tuberous Sclerosis." KnE Life Sciences, November 1, 2018. http://dx.doi.org/10.18502/kls.v4i8.3345.
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Tuberous sclerosis (TSC) is a genetic disease characterized by cerebral structural abnormalities (such as cortical tubers, subependymal nodes and abnormal cerebral white matter) which are detected by means of neuroimaging methods (e.g., MRI). Typically, these events cause neurological complications (i.e., epilepsy).Objective: cognitive function estimation in TSC children considering severity and nature of clinical course of the disease. 15 children with tuberous sclerosis (i.e., experimental group) and 46 children with normal development (i.e., control group) aged 6-16 years old underwent neuropsychological examination. As a result, polymorphic disorders of higher mental functions were revealed in TSC children. Neuropsychological deficit (p<0.05) was detected. Namely, voluntary attention and memorization impairments were found in TSC children with normaldevelopment. Operational thinking disorders, immaturity of dynamic and kinesthetic movement basis, somatosensory gnosis, optical spatial or quasi-three-dimensional imaging, as well as insufficient oral/aural and semantical memorization were mentioned in TSC children with mental retardation. Regardless of mental development, TSC children demonstrate neurodynamic activity disorder (p<0.05) presented by slow task performance, increased exhaustibility and attention fluctuation. According to comparison between research findings and clinical course data, severity of cognitive disorders substantially depends on epilepsy onset age because early onset results in more severe developmental disorder (p<0.05). Since tuberous sclerosis is a dynamic disease with new potential symptoms arising over a lifetime, neuropsychological testing will provide timely mental status qualification and development of corrective actions to activate the cognitive activity of a child.
Keywords: tuberous sclerosis, children, higher mental function (HMF) developmental disorders.