Journal articles on the topic 'Migration des VNFs'
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Qiao, Wenxin, Hao Lu, Yu Lu, Lijie Meng, and Yicen Liu. "A Dynamic Service Reconfiguration Method for Satellite–Terrestrial Integrated Networks." Future Internet 13, no. 10 (October 9, 2021): 260. http://dx.doi.org/10.3390/fi13100260.
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Satellite–terrestrial integrated networks (STINs) are regarded as a promising solution to meeting the demands of global high-speed seamless network access in the future. Software-defined networking and network function virtualization (SDN/NFV) are two complementary technologies that can be used to ensure that the heterogeneous resources in STINs can be easily managed and deployed. Considering the dual mobility of satellites and ubiquitous users, along with the dynamic requirements of user requests and network resource states, it is challenging to maintain service continuity and high QoE performance in STINs. Thus, we investigate the service migration and reconfiguration scheme, which are of great significance to the guarantee of continuous service provisioning. Specifically, this paper proposes a dynamic service reconfiguration method that can support flexible service configurations on integrated networks, including LEO satellites and ground nodes. We first model the migration cost as an extra delay incurred by service migration and reconfiguration and then formulate the selection processes of the location and migration paths of virtual network functions (VNFs) as an integer linear programming (ILP) optimization problem. Then, we propose a fuzzy logic and quantum genetic algorithm (FQGA) to obtain an approximate optimal solution that can accelerate the solving process efficiently with the benefits of the high-performance computing capacity of QGA. The simulation results validate the effectiveness and improved performance of the scheme proposed in this paper.
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Wei, Yifei, Yuning Jia, Jun Li, and Xiaojun Wang. "RESEARCH ON 5G NETWORK RESOURCE ORCHESTRATION ALGORITHM BASED ON NETWORK VIRTUALIZATION TECHNOLOGY." Latin American Applied Research - An international journal 52, no. 4 (September 25, 2022): 347–52. http://dx.doi.org/10.52292/j.laar.2022.970.
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With the advancement of wireless network technology to the next generation, network function virtualization (NFV) brings the advantages of centralized scheduling of virtual wireless resources and the ability to orchestrate virtual network functions. This makes it possible to dynamically deploy and manage service function chains (SFCs) in virtualized wireless networks according to changes in network load. Through the network function virtualization technology, the DU/CU separation architecture under 5G-NG-RAN is considered. Aiming at the resource orchestration problem of the 5G access network virtual protocol stack function and service function chain after deployment, an energy-aware virtualized network function instance (VNFI) orchestration algorithm is proposed. By modeling the underlying physical network and node energy consumption, the node load, resource type, tolerable delay and migration loss are included in the decision, and the state of the general server node is divided into two types: running state and sleep state. The algorithm decouples the decision-making process of VNF migration into two specific modules, namely "the VNF selection module" and "the migration destination node selection module". It is verified by simulation that compared with other energy-saving strategies, the algorithm in this paper has better performance in reducing energy consumption and reducing migration loss, and it can take into account both the reduction of the number of open server nodes and the improvement of resource utilization.
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Lv, Yan-xia, Sen Zhong, Hexin Tang, Bin Luo, Shao-Juan Chen, Long Chen, Fei Zheng, et al. "VEGF-A and VEGF-B Coordinate the Arteriogenesis to Repair the Infarcted Heart with Vagus Nerve Stimulation." Cellular Physiology and Biochemistry 48, no. 2 (2018): 433–49. http://dx.doi.org/10.1159/000491775.
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Background/Aims: Vagus nerve stimulation (VNS) suppresses arrhythmic activity and minimizes cardiomyocyte injury. However, how VNS affects angiogenesis/arteriogenesis in infarcted hearts, is poorly understood. Methods: Myocardial infarction (MI) was achieved by ligation of the left anterior descending coronary artery (LAD) in rats. 7 days after LAD, stainless-steel wires were looped around the left and right vagal nerve in the neck for vagus nerve stimulation (VNS). The vagal nerve was stimulated with regular pulses of 0.2ms duration at 20 Hz for 10 seconds every minute for 4 hours, and then ACh levels by ELISA in cardiac tissue and serum were evaluated for its release after VNS. Three and 14 days after VNS, Real-time PCR, immunostaining and western blot were respectively used to determine VEGF-A/B expressions and α-SMA- and CD31-postive vessels in VNS-hearts with pretreatment of α7-nAChR blocker mecamylamine (10 mg/kg, ip) or mACh-R blocker atropine (10 mg/kg, ip) for 1 hour. The coronary function and left ventricular performance were analyzed by Langendorff system and hemodynamic parameters in VNS-hearts with pretreatment of VEGF-A/B-knockdown or VEGFR blocker AMG706. Coronary arterial endothelial cells proliferation, migration and tube formation were evaluated for angiogenesis following the stimulation of VNS in coronary arterial smooth muscle cells (VSMCs). Results: VNS has been shown to stimulate VEGF-A and VEGF-B expressions in coronary arterial smooth muscle cells (VSMCs) and endothelial cells (ECs) with an increase of α-SMA- and CD31-postive vessel number in infarcted hearts. The VNS-induced VEGF-A/B expressions and angiogenesis were abolished by m-AChR inhibitor atropine and α7-nAChR blocker mecamylamine in vivo. Interestingly, knockdown of VEGF-A by shRNA mainly reduced VNS-mediated formation of CD31+ microvessels. In contrast, knockdown of VEGF-B powerfully abrogated VNS-induced formation of α-SMA+ vessels. Consistently, VNS-induced VEGF-A showed a greater effect on EC tube formation as compared to VNS-induced VEGF-B. Moreover, VEGF-A promoted EC proliferation and VSMC migration while VEGF-B induced VSMC proliferation and EC migration in vitro. Mechanistically, vagal neurotransmitter acetylcholine stimulated VEGF-A/B expressions through m/nACh-R/PI3K/Akt/Sp1 pathway in EC. Functionally, VNS improved the coronary function and left ventricular performance. However, blockade of VEGF receptor by antagonist AMG706 or knockdown of VEGF-A or VEGF-B by shRNA significantly diminished the beneficial effects of VNS on ventricular performance. Conclusion: VNS promoted angiogenesis/arteriogenesis to repair the infracted heart through the synergistic effects of VEGF-A and VEGF-B.
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Liu, Yanyang, Jing Ran, Hefei Hu, and Bihua Tang. "Energy-Efficient Virtual Network Function Reconfiguration Strategy Based on Short-Term Resources Requirement Prediction." Electronics 10, no. 18 (September 17, 2021): 2287. http://dx.doi.org/10.3390/electronics10182287.
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In Network Function Virtualization, the resource demand of the network service evolves with the change of network traffic. VNF dynamic migration has become an effective method to improve network performance. However, for the time-varying resource demand, how to minimize the long-term energy consumption of the network while guaranteeing the Service Level Agreement (SLA) is the key issue that lacks previous research. To tackle this dilemma, this paper proposes an energy-efficient reconfiguration algorithm for VNF based on short-term resource requirement prediction (RP-EDM). Our algorithm uses LSTM to predict VNF resource requirements in advance to eliminate the lag of dynamic migration and determines the timing of migration. RP-EDM eliminates SLA violations by performing VNF separation on potentially overloaded servers and consolidates low-load servers timely to save energy. Meanwhile, we consider the power consumption of servers when booting up, which is existing objectively, to avoid switching on/off the server frequently. The simulation results suggest that RP-EDM has a good performance and stability under machine learning models with different accuracy. Moreover, our algorithm increases the total service traffic by about 15% while ensuring a low SLA interruption rate. The total energy cost is reduced by more than 20% compared with the existing algorithms.
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Zhou, Xinhao, Bo Yi, Xingwei Wang, and Min Huang. "Approach for minimising network effect of VNF migration." IET Communications 12, no. 20 (December 20, 2018): 2574–81. http://dx.doi.org/10.1049/iet-com.2018.5188.
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Valdes-Ferrer, Sergio, Mauricio Rosas-Ballina, Peder Olofsson, Sangeeta Chavan, and Kevin Tracey. "Vagus Nerve Stimulation Produces an Anti-Inflammatory Monocyte Phenotype in Blood. (138.25)." Journal of Immunology 184, no. 1_Supplement (April 1, 2010): 138.25. http://dx.doi.org/10.4049/jimmunol.184.supp.138.25.
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Abstract Cytokine production and immune cell migration are under the control of the nervous system. Electrical stimulation of the vagus nerve attenuates cytokine production in endotoxemia, and down-modulates neutrophil migration in animal models of inflammation. The effect of vagus nerve stimulation (VNS) on PBMC phenotypes has not been characterized. We performed VNS or sham surgery in mice (n=5 group) and 24 hours later collected blood for analysis by flow cytometry. The total number of CD11b+ expressing cells was not affected, but CD11b+/Ly-6C+ monocytes significantly decreased in frequency (0.5% vs. 3.2%; p=0.005). VNS decreased dendritic cell numbers defined as CD11b+, CD11c+ (0.4% vs. 1.8%; p=0.042), or CD11c+, F4/80+ (1.6% vs. 2.7%; p=0.025). VNS did not affect the total number of circulating T cells (CD3+). VNS did not affect CD11b+ or Ly-6Clow, which are known to be VEGF-producing and anti-inflammatory. The present results indicate that VNS reduced the proportion of circulating pro-inflammatory monocytes and dendritic cells, and decreased the expression of monocytic lineage cells, in particular those expressed by M1 monocytes which are known to secrete TNF, Il-6, IL-12 (and reduced amounts of IL-10). Together, this indicates that direct activation of a neural circuit can down-modulate inflammatory cell phenotypes in blood, producing an anti-inflammatory cellular milieu.
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Yi, Bo, Xingwei Wang, Min Huang, and Kexin Li. "Design and Implementation of Network-Aware VNF Migration Mechanism." IEEE Access 8 (2020): 44346–58. http://dx.doi.org/10.1109/access.2020.2978002.
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Qu, Hua, Ke Wang, and Jihong Zhao. "Priority-awareness VNF migration method based on deep reinforcement learning." Computer Networks 208 (May 2022): 108866. http://dx.doi.org/10.1016/j.comnet.2022.108866.
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Yi, Bo, Xingwei Wang, Min Huang, and Anwei Dong. "A multi-criteria decision approach for minimizing the influence of VNF migration." Computer Networks 159 (August 2019): 51–62. http://dx.doi.org/10.1016/j.comnet.2019.04.010.
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Karapetjana, Indra, and Gunta Roziņa. "Lexicogrammatical aspects in English for dentistry acquisition materials." Valoda: nozīme un forma / Language: Meaning and Form 12 (December 2021): 64–73. http://dx.doi.org/10.22364/vnf.12.05.
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In the 21st century, globalization and massive migration have increased the global demand for effective transnational communication skills in English in the health care workplace and academic contexts, including dentistry. English for Dentistry falls under the umbrella of English for Specific Purposes (ESP): this refers to teaching and learning English as a foreign language in a particular domain. While the role of grammar acquisition in ESP courses is often understated in the key theoretical literature on ESP, this article highlights the importance of lexicogrammatical knowledge. Dentistry students and practitioners in Latvia highly value the accuracy in communication since the knowledge of various syntactic and morphological rules of grammar and their use in the dentistry-related context contribute to the accuracy required in the performance of different communicative tasks, for instance, asking for, explaining, and providing information, giving instructions. Besides, if dentists are unable, for example, to explain a diagnosis, agree on treatment options with the patient in a meaningfully accurate way, the dentist’s authority may be undermined, resulting in unsuccessful communication. The case study reports on the tasks employing lexicogrammatical strategies in the material “Dentistry and Language Integrated Learning”, which has been developed by the authors of this article working in close collaboration with individual academic staff at the the Faculty of Medicine of the University of Latvia. The material piloted amongst both dentistry practitioners and students suggests that the applied strategies of morphological derivation, for instance, recognizing and building new words by gaining control of affixation devices, can be considered as useful tools in the new lexeme meaning-making process in dentistry. As a result, this study has attempted to support the assumption that ESP and content and language integrated learning (or CLIL) are compatible and can be efficiently mastered in the professional discourse development process.
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Sounderajah, V., HM Moore, A. Thapar, TRA Lane, K. Fox, IJ Franklin, and AH Davies. "Acoustic reflectors are visible in the right heart during radiofrequency ablation of varicose veins." Phlebology: The Journal of Venous Disease 30, no. 8 (August 11, 2014): 557–63. http://dx.doi.org/10.1177/0268355514542680.
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Objective Cerebrovascular events have been noted after foam sclerotherapy for varicose veins. One hypothesis is migration of microemboli to the brain through a cardiac septal defect. The aim of this study was to identify whether acoustic reflectors are found in the right side of the heart during radiofrequency ablation of varicose veins, as neurological events are not reported during these procedures. Methods Transthoracic echocardiography was performed during local anaesthetic radiofrequency ablation (VNUS ClosureFast) of the great saphenous vein in 14 patients. An apical view was captured at the start of the procedure, during each cycle of heating and at 1 min post-treatment. Patients were monitored for 1 h. Video loops were read by an independent cardiologist. The presence of acoustic reflectors was classified as: 0 = absent, 1 = occasional, 2 = stream, 3 = complete opacification. Results Loops were of diagnostic quality in 11/14 (79%) patients. After the second cycle of heating, acoustic reflectors moving through the right heart were seen in 5/11 (45%) patients. These were classified as grade 1 in four patients and grade 2 in one patient. No acoustic reflectors were seen in the left heart. No neurological symptoms were reported. Conclusion Acoustic reflectors in the right heart are a common finding during radiofrequency ablation of varicose veins. Considering the prevalence of cardiac septal defects (17%), more neurological events would be expected if these particles were indeed responsible for these events. Further work is required to elicit the mechanisms underlying neurological complications following sclerotherapy.
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Alliau, Damien, Sébastien Roux, and Léa Parelle. "Apports de la modélisation physique avec distorsions pour l'analyse des cours d'eau sableux : exemple de la Loire aval." La Houille Blanche, no. 2 (April 2020): 14–33. http://dx.doi.org/10.1051/lhb/2020013.
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Création de 700 épis dans le dernier siècle, extractions massives de sable réalisées pour les besoins de l'industrie … ces actions anthropiques ont eu des conséquences graves sur le fonctionnement de la Loire : enfoncement du lit, et mauvaise alimentation des annexes fluviales notamment. Dans le cadre du plan Loire IV (2014–2020) financé notamment par l'Union européenne, et dont la maîtrise d'ouvrage est en partie portée par Voies Navigables de France (VNF), la réalisation d'un ouvrage de correction sédimentaire a été proposée au voisinage de Nantes, avec l'objectif d'engendrer un remous solide régressif. Pour les études conception morpho-sédimentaires, la Compagnie Nationale du Rhône (CNR) a proposé une modélisation hybride ou composite, qui s'appuie notamment sur un modèle numérique 2D hydro-sédimentaire ainsi qu'un modèle physique de grande dimension : 1/100 pour l'échelle de longueur avec un facteur 2 de distorsion verticale, 1/33 pour l'échelle de densité des matériaux. Ce modèle à fond mobile a été conçu pour satisfaire à deux lois de similitudes dont la combinaison produit des distorsions géométriques et de densité des matériaux. La complexité d'un tel modèle impose un grand nombre de vérifications par l'expérience qu'il faut confronter aux approches théoriques de dimensionnement : du comportement granulaire aux macro-phénomènes (dunes). Un jeu de 341 dunes formées en laboratoire pendant plus de 50 essais a été analysé selon deux axes : le premier concerne la caractérisation géométrique (hauteur, longueur) grâce à la disponibilité de Modèles Numériques de Terrain capturés par un procédé de photogrammétrie submergée, et le second est focalisé sur la vitesse de migration des dunes par Large Scale Particle Image Velocimetry (LSPIV). L'ensemble des analyses réalisées a montré la très bonne adéquation entre les résultats de laboratoire et les phénomènes ligériens de transport de sable.
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"An Improved Multipath Routing Scheme using Virtual Network Path Migration." International Journal of Recent Technology and Engineering 8, no. 2 (July 30, 2019): 635–39. http://dx.doi.org/10.35940/ijrte.b1645.078219.
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Virtual Network Functions (VNFs) situation and tying within the sight of physical connection disappointments. A steering convention's duty lie s in deciding the manner in which switches speak with one another so as to advance any sort of bundles from a source to a goal utilizing the ideal way that would give the most proficiency. Continuous basic interactive media requires effective steering for information conveyance with ensured QoS fulfilling the stringent QoS prerequisites of sight and sound transmission for the most part means high vitality utilization. We propose a jump by-bounce dynamic disseminated directing plan for the execution of this system wide enhancement issue. The calculation created in this paper is gives multipath directing, uses every conceivable edge, ensures recuperation from single connection disappointment and accomplishes all these with at most one piece for every bundle as overhead while steering depends on goal address and approaching edge. The proposed calculation designs vitality mindful bunch comprising of one header hub and various part hubs. The Software Defined Networking (SDN) can possibly empower dynamic setup and control for the improved system the executives. This document introduces the plan of a virtualization organizer dependent on system strategy in SDN conditions. The proposed novel directing calculations for diminishing the vitality utilization of optical systems to rest cycle conventions in favor of utilize in the system hubs. Vitality Aware visual system conventions can affect the Quality-of-Services-(QoS), for example, bit-blunder-rate (BER) and postponement. Our reproduction tests demonstrate that way part, way relocation, and tweaked implanting calculations empower a substrate system to fulfill a lot bigger blend of virtual systems
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Siasi, Nazli, and Mohammed A. Jasim. "Migration of VNF Instances for Service Continuity." Internet Technology Letters, March 5, 2023. http://dx.doi.org/10.1002/itl2.422.
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Zhang, Qixia, Fangming Liu, and Chaobing Zeng. "Online Adaptive Interference-Aware VNF Deployment and Migration for 5G Network Slice." IEEE/ACM Transactions on Networking, 2021, 1–14. http://dx.doi.org/10.1109/tnet.2021.3080197.
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Gowtham, Pemula, Pragya Pallavi, Karthick Harini, Koyeli Girigoswami, and Agnishwar Girigoswami. "Hydrogelated Virus Nanoparticles in Tissue Engineering." Current Nanoscience 18 (May 20, 2022). http://dx.doi.org/10.2174/1573413718666220520094933.
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Abstract: Hydrogels are an integrated three-dimensional network of water-absorbing hydrophilic polymers that can support tissue regeneration and release medication under controlled conditions. Hydrogel-based structures physically resemble the extracellular matrix besides being effective for biomedical applications and tissue engineering. Hydrogels must provide relevant biological signals to control the cell behavior to become an ideal bioactive scaffold for tissue regeneration. Incorporating virus nanoparticles (VNP) that can release essential peptides into the hydrogels is a promising option to formulate a bioactive scaffold that can facilitate cell proliferation, adhesion, migration, and differentiation. Over the recent period, virologists have discovered many viruses that lead to a great understanding of the diversity of viruses in nature. Viruses affecting the plants are called plant viruses, and they have a wide variety of shapes and sizes, yet each species produces monodisperse nucleoprotein particles. Plant viruses are not capable of infecting or reproducing in humans. Therefore, VNPs are engineered from plant viruses whose genetically programmed structures can be manipulated at the gene level, bioconjugated, or encapsulated. By displaying protein molecules or epitopes or constructing inorganic hybrid materials, or by carrying molecular charges, plant VNPs can act as clinical diagnostic agents, immunomodulators, medicines, nanoreactors, and biosensors. The present review focuses on the plant virus-mediated nanoparticles encapsulated in bioactive hydrogels to provide an ideal platform for tissue engineering.
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Bao, Yi, Jianning Zhai, Huarong Chen, Chi Chun Wong, Cong Liang, Yanqiang Ding, Dan Huang, et al. "Targeting m6A reader YTHDF1 augments antitumour immunity and boosts anti-PD-1 efficacy in colorectal cancer." Gut, January 30, 2023, gutjnl—2022–328845. http://dx.doi.org/10.1136/gutjnl-2022-328845.
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ObjectiveThe role of N6-methyladenosine (m6A) in tumour immune microenvironment (TIME) remains understudied. Here, we elucidate function and mechanism of YTH N6-methyladenosine RNA binding protein 1 (YTHDF1) in colorectal cancer (CRC) TIME.DesignClinical significance of YTHDF1 was assessed in tissue microarrays (N=408) and TCGA (N=526) cohorts.YTHDF1function was determined in syngeneic tumours, intestine-specificYthdf1knockin mice, and humanised mice. Single-cell RNA-seq (scRNA-seq) was employed to profile TIME. Methylated RNA immunoprecipitation sequencing (MeRIP-seq), RNA sequencing (RNA-seq) and ribosome sequencing (Ribo-seq) were used to identify YTHDF1 direct targets. Vesicle-like nanoparticles (VNPs)-encapsulatedYTHDF1-siRNA was used forYTHDF1silencing in vivo.ResultsYTHDF1expression negatively correlated with interferon-γ gene signature in TCGA-CRC. Concordantly, YTHDF1 protein negatively correlated with CD8+T-cell infiltration in independent tissue microarrays cohorts, implying its role in TIME. Genetic depletion ofYthdf1augmented antitumour immunity in CT26 (MSS-CRC) and MC38 (MSI-H-CRC) syngeneic tumours, whileYthdf1knockin promoted an immunosuppressive TIME facilitating CRC in azoxymethane-dextran sulphate-sodium orApcMin/+models. scRNA-seq identified reduction of myeloid-derived suppressor cells (MDSCs), concomitant with increased cytotoxic T cells inYthdf1knockout tumours. Integrated MeRIP-seq, RNA-seq and Ribo-seq revealed p65/Rela as a YTHDF1 target. YTHDF1 promoted p65 translation to upregulate CXCL1, which increased MDSC migration via CXCL1-CXCR2 axis. Increased MSDCs in turn antagonised functional CD8+T cells in TIME. Importantly, targeting YTHDF1 by CRISPR (Clustered Regularly Interspaced Short Palindromic Repeats) or VNPs-siYTHDF1boosted anti-PD1 efficacy in MSI-H CRC, and overcame anti-PD1 resistance in MSS CRC.ConclusionYTHDF1 impairs antitumour immunity via an m6A-p65-CXCL1/CXCR2 axis to promote CRC and serves as a therapeutic target in immune checkpoint blockade therapy.