scholarly journals RDNA: Arquitetura Definida por Resíduos para Redes de Data Centers

2019 ◽  
Author(s):  
Alextian Bartholomeu Liberato ◽  
Moises Ribeiro ◽  
Magnos Martinello
Keyword(s):  
Data Centers ◽  
Number System ◽  
Failure Recovery ◽  
Multicast Communication ◽  
5G Networks ◽  
New Approach ◽  
Edge Elements ◽  
Computing Paradigm ◽  
Mathematical Properties ◽  
Networking Architecture

Datacenter (DC) design has been moved towards the edge computing paradigm motivated by the need of bringing cloud resources closer to end users. However, the Software Defined Networking (SDN) architecture offers no clue to the design of Micro Datacenters (MDC) for meeting complex and stringent requirements from next generation 5G networks. This is because canonical SDN lacks a clear distinction between functional network parts, such as core and edge elements. Besides, there is no decoupling between the routing and the network policy. In the thesis, we introduce Residue Defined Networking Architecture (RDNA) as a new approach for enabling key features like ultra-reliable and low-latency communication in MDC networks. RDNA explores theprogrammability of Residues Number System (RNS) as a fundamental concept to define a minimalist forwarding model for core nodes. Instead of forwarding packets based on classical table lookup operations, core nodes are tableless switches that forward packets using merely remainder of the division (modulo) operations. By solving a residue congruence system representing a network topology, we found out the algorithms and their mathematical properties to design RDNAs routing system that (i) supports unicast and multicast communication,(ii) provides resilient routes with protection for the entire route, and (iii) is scalable for 2-tier Clos topologies. Experimental implementations on Mininet and NetFPGA SUME show that RDNA achieves 600 ns switching latency per hop with virtually no jitter at core nodes and sub-millisecond failure recovery time.

scholarly journals Improvement of Adaptive Load Balanced Gateway Discovery Protocol in Hybrid Integrated Internet-MANET

2017 ◽  
Vol 11 (3) ◽  
pp. 162
Author(s):  
Rafi U Zaman ◽  
Humaira M Alam ◽  
Khaleel Ur Rahman Khan ◽  
A. Venugopal Reddy
Keyword(s):  
Load Balancing ◽  
Performance Metrics ◽  
Mobile Node ◽  
Simulation Tool ◽  
5G Networks ◽  
End To End Delay ◽  
Hybrid Framework ◽  
Different Types ◽  
Gateway Discovery ◽  
Networking Architecture

<p class="0abstract">Internetworking of different types of networks is envisaged as one of the primary objectives of the future 5G networks. Integrated Internet-MANET is a heterogeneous networking architecture which is the result of interconnecting wired Internet and wireless MANET. Multiprotocol gateways are used to achieve this interconnection. There are two types of Integrated Internet-MANET architectures, two-tier and three-tier. A combination of two-tier and three tier architectures also exists, called the Hybrid Framework or Hybrid Integrated Internet-MANET. Some of the most important issues common to all Integrated Internet-MANET architecture are: efficient gateway discovery, mobile node registration and gateway load balancing. Adaptive WLB-AODV is an existing protocol which addresses the issues of Gateway load balancing and efficient Gateway discovery. In this paper, an improvement is proposed to Adaptive WLB-AODV, called Adaptive Modified-WLV-AODV by taking into account route latency. The proposed protocol has been implemented in Hybrid Integrated Internet-MANET and has been simulated using network simulation tool ns-2. Based on the simulation results, it is observed that the proposed protocol delivers better performance than the existing protocol in terms of performance metrics end-to-end delay and packet loss ratio.  The performance of the proposed protocol is further optimized using a genetic algorithm.</p>

scholarly journals A New Extended-F Family: Properties and Applications to Lifetime Data

2020 ◽  
Vol 2020 ◽  
pp. 1-9
Author(s):  
Saima K. Khosa ◽  
Ahmed Z. Afify ◽  
Zubair Ahmad ◽  
Mi Zichuan ◽  
Saddam Hussain ◽  
...  
Keyword(s):  
Maximum Likelihood ◽  
Maximum Likelihood Estimators ◽  
Real Data ◽  
Model Parameters ◽  
Additional Parameter ◽  
Alpha Power ◽  
New Approach ◽  
New Class ◽  
Mathematical Properties ◽  
Extended Weibull Distribution

In this article, a new approach is used to introduce an additional parameter to a continuous class of distributions. The new class is referred to as a new extended-F family of distributions. The new extended-Weibull distribution, as a special submodel of this family, is discussed. General expressions for some mathematical properties of the proposed family are derived, and maximum likelihood estimators of the model parameters are obtained. Furthermore, a simulation study is provided to evaluate the validity of the maximum likelihood estimators. Finally, the flexibility of the proposed method is illustrated via two applications to real data, and the comparison is made with the Weibull and some of its well-known extensions such as Marshall–Olkin Weibull, alpha power-transformed Weibull, and Kumaraswamy Weibull distributions.

Abacus Interactive

2018 ◽  
Vol 23 (5) ◽  
pp. 288-297
Author(s):  
Ellen Robinson ◽  
Xiaowen Cui ◽  
Nama Namakshi ◽  
Hiroko K. Warshauer ◽  
Sonalee Bhattacharyya ◽  
...  
Keyword(s):  
Teaching And Learning ◽  
Number System ◽  
Place Value ◽  
Elementary Grades ◽  
School Students ◽  
Learning Standards ◽  
Mathematical Properties ◽  
Hands On ◽  
Addition And Subtraction ◽  
Expanded Form

Calculators are often efficient in finding the answer to an addition or subtraction problem, but they do not reveal the process by which the answer is obtained. Developing students' fluency in addition and subtraction using strategies and algorithms based on place value, composing and decomposing numbers in base 10, and reading and writing numerals in expanded form are important teaching and learning standards not only for the elementary grades but for middle school students as well (NCTM 2000; CCSSI 2010; TEA 2015). We introduced the Chinese abacus to our students as a hands-on tool to illuminate the meaning of a number in expanded form in terms of place values and to strengthen students' conceptual understanding of the standard algorithms of addition and subtraction. “Students' understanding of the base 10 number system is deepened as they come to understand its multiplicative structure” (NCTM 2000, p. 143). This activity will let students explore the mathematical properties of the base 10 system in a creative and interactive way. Students develop a deeper meaning of why the standard algorithms work and how they relate to a number in expanded form. This activity is best suited for elementary and middle grades.

A CONTINUOUS SIZE-STRUCTURED RED CORAL GROWTH MODEL

2008 ◽  
Vol 18 (11) ◽  
pp. 1927-1944 ◽  
Author(s):  
P.-E. JABIN ◽  
V. LEMESLE ◽  
D. AURELLE
Keyword(s):  
Mediterranean Sea ◽  
Growth Model ◽  
Continuous Model ◽  
Coral Growth ◽  
Structured Model ◽  
New Approach ◽  
Mathematical Properties ◽  
Red Coral ◽  
Ecological Problems ◽  
Dynamics Simulations

The aim of this paper is to derive and analyze the mathematical properties of a new continuous size-structured model for red coral (Corallium rubrum, L.) growth. Since historical Leslie models4 are often used to deal with some ecological problems, a new approach is here proposed and give some promising results. The main advantage of using continuous model is that we hope to describe precisely the mass mortality events, observed in Mediterranean sea, and its consequences on red coral dynamics. Simulations' studies allow us to qualitatively discuss some questions about red coral populations dynamics. The development of this method should be useful for the study of the conservation of red coral populations.

scholarly journals A New Approach to Detecting and Correcting Single and Multiple Errors in Wireless Sensor Networks

2021 ◽  
pp. 27-43
Author(s):  
Yakubu Abdul-Wahab Nawusu ◽  
Alhassan Abdul-Barik ◽  
Salifu Abdul-Mumin
Keyword(s):  
Wireless Sensor Networks ◽  
Data Transmission ◽  
Communication Systems ◽  
Fault Tolerant ◽  
Number System ◽  
Residue Number System ◽  
Wireless Sensor ◽  
New Approach ◽  
Transmission Errors ◽  
Residue Number

Transmission errors are commonplace in communication systems. Wireless sensor networks like many other communication systems are susceptible to various forms of errors arising from sheer noise, heat and interference in sensor circuitry and from other forms of distortions. Research efforts in WSN have attempted to guarantee reliable and accurate data transmission from a target environment in the midst of these unwanted exposures. Many techniques have appeared and employed over the years to deal with the issue of transmission errors in communication systems. In this paper we present a new approach for single and multiple error control in WSN relying on the inherent fault tolerant feature of the Redundant Residue Number System. As an off shoot of Residue Number System, RRNS's fault tolerant capabilities help in building robust systems required for reliable data transmission in WSN systems. The Chinese Remainder Theorem and the Manhattan Distance Heuristics are used during the integer recovery process when detecting and correcting error digit(s) in a transmitted data. The proposed method performs considerably better in terms of data retrieval time than similar approaches by needing a smaller number of iterations to recover an originally transmitted data from its erroneous form. The approach in this work is also less computationally intensive compared to recent techniques during the error correction steps. Evidence of utility of the technique is illustrated in numerical examples.

Mobility Support in a P2P System for Publish/Subscribe Applications

2011 ◽  
pp. 68-93
Author(s):  
Thomas Kunz ◽  
Abdulbaset Gaddah ◽  
Li Li
Keyword(s):  
Mobile Computing ◽  
Peer To Peer ◽  
New Approach ◽  
Mobility Support ◽  
Unknown Number ◽  
Related Information ◽  
Computing Paradigm ◽  
Significant Performance ◽  
Computing Environments ◽  
P2p System

Peer-to-Peer computing is a popular, relatively new, distributed computing paradigm. It allows for a flexible set of participants to coordinate their resources with little overhead or reliance on central servers/ services and is becoming particularly relevant in mobile computing environments, where peers come and go. Communication between an (unknown) number of peers, which may or may not be online at the same time, is greatly facilitated by the publish/subscribe model. In this chapter, the authors review the stateof- the-art in publish/subscribe systems, focusing on the support for mobile peers in infrastructure-based networks. They propose a novel handoff approach that proactively distributes pub/sub-related information to brokers/superpeers ahead of a peer’s movement. They show through extensive experiments in a small testbed that the new approach has significant performance benefits, compared to the more typical reactive approach, in which pub/sub context is only established after a handoff event occurred.

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