scholarly journals Comprehensive Comparison of VNE Solutions Based on Different Coordination Approaches

Telecom ◽  
2021 ◽  
Vol 2 (4) ◽  
pp. 390-413
Author(s):  
Stelios Prekas ◽  
Panagiotis Karkazis ◽  
Vasileios Nikolakakis ◽  
Panagiotis Trakadas
Keyword(s):  
Single Stage ◽  
The Internet ◽  
Mapping Functions ◽  
Coordination Strategies ◽  
Coordination Strategy ◽  
Physical Resources ◽  
Comprehensive Comparison ◽  
Mixed Coordination ◽  
Future Self

Virtualization is commonly accepted as the catalyst that would grant the internet the ability to shed the shackles of legacy technologies and evolve to its future self. In order to make this transformation feasible, unavoidable concurrent radical remodeling of all the involved counterparts is required, particularly in the context of automatically and optimally serving application requests by taking advantage of new virtualized environments and their latent capabilities. A considerable number of embedding strategies that efficiently map virtual computational and networking demands over physical resources have already been proposed in the literature, following different strategies. Among these suggested strategies, different coordination proposals have been adopted, in order to solve the node and link mapping functions. In this paper, we study the capabilities of the most popular embedding strategies, based on their coordination categorization. Our study confirms that by invoking a coordination strategy, especially the single stage one, added benefits on multiple performance layers can be achieved. Moreover, we propose a new mixed coordination algorithm, essentially creating a new category in the field of VNE coordination strategies.

Security for Virtualization in Cloud Services using Duplication Method

2017 ◽  
Vol 6 (2) ◽  
pp. 482
Author(s):  
N.L. Udaya Kumar ◽  
M. Siddappa
Keyword(s):  
Cloud Computing ◽  
Cloud Services ◽  
The Internet ◽  
Physical Resources ◽  
The Cost ◽  
Virtual Resources ◽  
Different Levels ◽  
The Way

Cloud computing is the way of computing, where all the computing resources are available as a service over the internet based on requirements of the users. Virtualization is the concept which plays very important role in reducing the cost of investment and increases utilization and allows multi-tenancy. This concept helps to create virtual resources out of existing physical resources. When the virtual resources are created, they may face the problems due to various reasons and may not work properly. Providing the protection to these virtual resources and make them to work without any problem is the important. Here we introduce an approach called duplication method which allows the users to create more number of same virtual resources, so that if one of the resources fail due to some reason, users may have some more same resources to continue without disturbing their work and provide the security at different levels to make Virtual resources secure.

scholarly journals Modeling and Simulation of Complex Network Attributes on Coordinating Large Multiagent System

2014 ◽  
Vol 2014 ◽  
pp. 1-15 ◽  
Author(s):  
Yang Xu ◽  
Xiang Li ◽  
Ming Liu
Keyword(s):  
Complex Network ◽  
Multiagent Systems ◽  
Decision Problem ◽  
Multiagent System ◽  
Algorithm Design ◽  
Distributed Agents ◽  
Coordination Strategies ◽  
Coordination Strategy ◽  
Significant Difference ◽  
Present Simulation

With the expansion of distributed multiagent systems, traditional coordination strategy becomes a severe bottleneck when the system scales up to hundreds of agents. The key challenge is that in typical large multiagent systems, sparsely distributed agents can only communicate directly with very few others and the network is typically modeled as an adaptive complex network. In this paper, we present simulation testbedCoordSimbuilt to model the coordination of network centric multiagent systems. Based on the token-based strategy, the coordination can be built as a communication decision problem that agents make decisions to target communications and pass them over to the capable agents who will potentially benefit the team most. We have theoretically analyzed that the characters of complex network make a significant difference with both random and intelligent coordination strategies, which may contribute to future multiagent algorithm design.

scholarly journals A Bacterial Chemotaxis-Inspired Coordination Strategy for Coverage and Aggregation of Swarm Robots

2021 ◽  
Vol 11 (3) ◽  
pp. 1347
Author(s):  
Laihao Jiang ◽  
Hongwei Mo ◽  
Peng Tian
Keyword(s):  
Optimization Algorithm ◽  
Fitness Function ◽  
Bacterial Chemotaxis ◽  
Superior Performance ◽  
Bacterial Foraging Optimization ◽  
Random Factor ◽  
Bacterial Colony ◽  
Coordination Strategies ◽  
Coordination Strategy ◽  
Swarm Robots

Many bio-inspired coordination strategies have been investigated for swarm robots. Bacterial chemotaxis exhibits a certain degree of intelligence, and has been developed some optimization algorithm for robot(s), e.g., bacterial foraging optimization algorithm (BFOA) and bacterial colony chemotaxis optimization algorithm (BCC). This paper proposes a bacterial chemotaxis-inspired coordination strategy (BCCS) of swarm robotic systems for coverage and aggregation. The coverage is the problem of finding a solution to uniformly deploy robots on a given bounded space. To solve this problem, this paper uses chaotic preprocessing to generate the initial positions of the robots. After the initialization, each robot calculates the area only covered by itself as the fitness function value. Then, each robot makes an action, running or rotating, depending on coordination strategy inspired bacterial chemotaxis. Moreover, we extend this solution and introduce a random factor to overcome aggregation, which is to guide robots to rendezvous at an unspecified point. The simulation results demonstrate the superior performance of the proposed coordination strategy in both success rate and an average number of iterations than other controllers.

scholarly journals A comprehensive comparison of atmospheric mapping functions for GPS measurements in Egypt

2012 ◽  
Vol 2 (3) ◽  
pp. 216-223 ◽  
Author(s):  
S. A. Younes ◽  
A. G. Elmezayen
Keyword(s):  
Meteorological Data ◽  
Mapping Function ◽  
Propagation Delay ◽  
Tropospheric Delay ◽  
Radio Waves ◽  
Dual Frequency ◽  
Mapping Functions ◽  
Limiting Error ◽  
Comprehensive Comparison ◽  
Delay Prediction

AbstractThe principal limiting error source in the Global Positioning System (GPS) is the mismodeling of the delay experienced by radio waves in propagating through the atmosphere. The atmosphere causing the delay in GPS signals consists of two main layers: the ionosphere and the troposphere. The ionospheric delay can be mitigated using dual frequency receivers, but the tropospheric delay is often corrected using a standard tropospheric model. The tropospheric delay can be described as a product of the delay at the zenith and a mapping function, which models the elevation dependence of the propagation delay. A large number of mapping functions have been developed for use in the analysis of space geodetic data. An assessment of most of these mapping functions including those developed by Niell (NMF), Herring (MTT), Davis (CfA-2.2), Ifadis, Chao, Black & Eisner (B & E), Yang & Ping, Moffett, Vienna (VMF), and Isobaric (IMF) have been performed. The behavior of these mapping functions was assessed by comparing their results with highly accurate Numerical Integration based Models (NIM) for three different stations in Egypt (Aswan, Helwan, and Mersa Matrouh) at different times throughout the year. The meteorological data used in this study was taken from the Egyptian Meteorological Authority (EMA) as average values between 1990 and 2005. It can be concluded that the Black & Eisner mapping function is recommended for dry tropospheric delay prediction for low zenith angles, whereas VMF will be the choice for elevation angles up to 10°.

Cochlear Implant Programming through the Internet

2016 ◽  
pp. 51-64
Author(s):  
Georgios Kyriafinis ◽  
Panteleimon Chriskos
Keyword(s):  
Surgical Treatment ◽  
Cochlear Implant ◽  
Cochlear Implants ◽  
Special Care ◽  
The Internet ◽  
Acoustic Characteristics ◽  
Mapping Functions ◽  
Large Numbers

The ordinary user of cochlear implants is subject to post-surgical treatment that calibrates and adapts via mapping functions the acoustic characteristics of the recipient's hearing. As the number of cochlear implant users reaches indeed large numbers and their dispersion over vast geographic areas seems to be a new trend with impressive expansion, the need for doctors and audiologists to remotely program the cochlear implants of their patients comes as first priority, facilitating users in their programmed professional or personal activities. As a result, activities that need special care, like playing sport, swimming, or recreation can be performed remotely, disburdening the recipient from traveling to the nearest specialized programming center. However, is remote programming safeguarded from hazards?

scholarly journals Optimal Coordination Strategy for International Production Planning and Pollution Abating under Cap-and-Trade Regulations

2019 ◽  
Vol 16 (18) ◽  
pp. 3490 ◽  
Author(s):  
Baogui Xin ◽  
Wei Peng ◽  
Minghe Sun
Keyword(s):  
Production Planning ◽  
Cap And Trade ◽  
Hjb Equations ◽  
Coordination Strategies ◽  
Coordination Strategy ◽  
International Production ◽  
Optimal Coordination ◽  
Hamilton Jacobi Bellman ◽  
Pollution Emissions ◽  
Cooperative Differential Games

Because both pollution emissions and production policies often are international in scope, it is necessary to find optimal coordination strategies for international production planning and pollution abating. Differential game models are developed for multiple neighboring countries to reach optimal decisions on their production planning and pollution abating under cap-and-trade regulations. Non-cooperative and cooperative differential games are presented to depict the optimal tradeoffs between production planning and pollution abating. Hamilton-Jacobi-Bellman (HJB) equations are then employed to analyze the asymmetric and symmetric feedback solutions. Numerical simulations are used to illustrate the results. Five different dividends are also discussed. With the proposed strategies, more improvement will be directed toward production supplies and environmental issues than ever before.

scholarly journals Identity-related issues in meme communication

2018 ◽  
Vol 1 (1) ◽  
pp. 113-133 ◽  
Author(s):  
Francisco Yus
Keyword(s):  
Participatory Culture ◽  
Single Stage ◽  
Self Concept ◽  
The Internet ◽  
Self Awareness

Abstract Internet memes are an example of the trend of replicability and spread of discourses through the Net within today’s participatory culture. On paper, memes are instances of humorous discourse that abound on the internet, are replicated or altered, and then transmitted to other users. However, in this paper the focus is not on its humorous side, but on how every single stage of meme communication entails a greater or lesser impact on the user’s self-concept, self-awareness and overall identity. The paper addresses five stages of meme communication and possible ways in which these stages influence the user’s identity.

scholarly journals Comparison Among Cloud Technologies and Cloud Performance

2020 ◽  
Vol 1 (2) ◽  
pp. 40-47 ◽  
Author(s):  
Omar Alzakholi ◽  
Lailan Haji ◽  
Hanan Shukur ◽  
Rizgar Zebari ◽  
Shakir Abas ◽  
...  
Keyword(s):  
Cloud Computing ◽  
Computing System ◽  
Cloud System ◽  
The Internet ◽  
Computing Systems ◽  
Multiple Factors ◽  
Procedure Cost ◽  
Cloud Computing System ◽  
Comprehensive Comparison ◽  
Cloud Technologies

The cloud is the best method used for the utilization and organization of data. The cloud provides many resources for us via the internet. There are many technologies used in cloud computing systems; each one uses a different kind of protocols and methods. Many tasks can execute on different servers per second, which cannot execute on their computer. The most popular technologies used in the cloud system are Hadoop, Dryad, and another map reducing framework. Also, there are many tools used to optimize the performance of the cloud system, such as Cap3, HEP, and Cloudburst. This paper reviews in detail the cloud computing system, its used technologies, and the best technologies used with it according to multiple factors and criteria such as the procedure cost, speed cons and pros. Moreover, A comprehensive comparison of the tools used for the utilization of cloud computing systems is presented.  

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