computing and communication are getting increasingly ubiquitous withthe inclusion of sophisticated devices like electric vehicles, smart phones and other house hold appliances. Due to the constant evolution in Intern...
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the IEEE 802.11ax Working Group is aiming to devise ways to improve spectrum efficiency, in particular to enhance the system throughput in highly dense scenarios, frequently referred to as Overlapped Basic Service Set...
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ISBN:
(纸本)9781467377010
the IEEE 802.11ax Working Group is aiming to devise ways to improve spectrum efficiency, in particular to enhance the system throughput in highly dense scenarios, frequently referred to as Overlapped Basic Service Set (OBSS). Several techniques are being considered to achieve these objectives. In this paper we explore receiver sensitivity adaptation, one of these techniques, as a potential lever for accomplishing the above mentioned objectives. In particular, we propose a practical method of adapting receiver sensitivity and highlight findings from a comprehensive simulation based study conducted using the network simulator ns3. Findings from this study indicate that the proposed method significantly outperforms the baseline technique currently being considered in the 11ax working group. the proposed method achieves this without requiring any changes to the hardware, the existing infrastructure and the WLAN standard. Moreover, STAs employing the proposed technique can co-exist with legacy devices that do not employ such adaptation. Findings also highlight that the traditional conservative approach of using a static CCA threshold (no sensitivity adaptation) may not always yield the best performance and that identifying the optimal CCA threshold at design time is a non-trivial problem.
the roles of processor allocation and job scheduling in achieving good performance on hypercube computers are compared. It is shown that the choice of job scheduling discipline has a dramatic effect on performance. A ...
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ISBN:
(纸本)0818621443
the roles of processor allocation and job scheduling in achieving good performance on hypercube computers are compared. It is shown that the choice of job scheduling discipline has a dramatic effect on performance. A family of scheduling disciplines, called Scan, with particular performance advantages is proposed. Furthermore, it is shown that if Scan scheduling is used, the choice of processor allocation strategy has negligible effect on performance. As a result, complex allocation strategies can be replaced by a simple O(n) strategy.
distributed automatic garbage collection of objects possessing their own thread of control is discussed. the relevance of garbage collection and concurrent objects to distributed applications is briefly discussed, and...
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ISBN:
(纸本)0818621443
distributed automatic garbage collection of objects possessing their own thread of control is discussed. the relevance of garbage collection and concurrent objects to distributed applications is briefly discussed, and the specific model of concurrent objects used is explained. the collector comprises a collection of independent local collectors, one per node, loosely coupled to a distributed global collector. the mutator (application), the local collectors, and the global collector run concurrently. the synchronization necessary to achieve correct and efficient concurrent operation between the collectors is presented. One interesting aspect of the distributed collector is the termination algorithm.
An approach to dynamic reconfiguration in online distributed applications based on a data sharing model is presented. the data sharing model consists of facets, objects, and processes, with facets as the unit of shari...
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ISBN:
(纸本)0818621443
An approach to dynamic reconfiguration in online distributed applications based on a data sharing model is presented. the data sharing model consists of facets, objects, and processes, with facets as the unit of sharing. the primary contribution of this work is the addition of important special cases of dynamic reconfiguration, without resorting to general dynamic allocation. A metaphor consistent with PROFIT's data sharing model for expressing dynamic reconfiguration facilities within the programming language is proposed.
In this paper, the attention is focused on the design of a new multi-layered architecture for vehicular environment. System will be able to gather information from vehicular devices. this will allow system to faster r...
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ISBN:
(纸本)9783903176034
In this paper, the attention is focused on the design of a new multi-layered architecture for vehicular environment. System will be able to gather information from vehicular devices. this will allow system to faster respond at emergency situation such as traffic jams or collisions. distributed entities work at different layers exploiting cloud and fog computing in order to better distribute tasks along the infrastructure. Lower layer is composed of On-Board Units (OBUs) and RoadSide Units (RSUs) that exploits Vehicular Ad-hoc Network (VANET) protocols for inner VANET communications. At the Edge layer we propose fog computing nodes that gather data from RSUs for local processing and after an aggregation step they send data to an Intelligent Transportation System (ITS) management system. the proposed architecture has the main goal to better respond to the network and traffic dynamics by improving performances of the ITS system.
the Internet of things (IoT) has emerged as a fundamental cornerstone in the digitalization of industry and society. Still, IoT devices' limited processing and memory capacities pose a problem for conducting compl...
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ISBN:
(数字)9781665486279
ISBN:
(纸本)9781665486279
the Internet of things (IoT) has emerged as a fundamental cornerstone in the digitalization of industry and society. Still, IoT devices' limited processing and memory capacities pose a problem for conducting complex and time-sensitive computations such as AI-based shop floor monitoring or personalized health tracking on these devices, and offloading to the cloud is not an option due to excessive delays. Edge computing has recently appeared to address the requirements of these IoT applications. this paper formulates the scheduling of tasks between IoT devices, edge servers, and the cloud in a three-layer Mobile Edge computing (MEC) architecture as a Mixed-Integer Linear Programming (MILP) problem. the paper proposes a simulated annealing-based task scheduling technique and demonstrates that it schedules tasks almost as time-efficient as if the MILP problem had been solved with a mixed integer programming optimization package;however, at a fraction of the cost in terms of CPU, memory, and network resources. Also, the paper demonstrates that the proposed task scheduling technique compares favorably in terms of efficiency, resource consumption, and timeliness with previously proposed techniques based on heuristics, including genetic programming.
P2P, Grid, Cloud and Internet computing technologies have been very fast established as breakthrough paradigms for solving complex problems by enabling aggregation and sharing of an increasing variety of distributed c...
ISBN:
(纸本)3319491083;9783319491080
P2P, Grid, Cloud and Internet computing technologies have been very fast established as breakthrough paradigms for solving complex problems by enabling aggregation and sharing of an increasing variety of distributed computational resources at large scale. the aim of this volume is to provide latest research findings, innovative research results, methods and development techniques from boththeoretical and practical perspectives related to P2P, Grid, Cloud and Internet computing as well as to reveal synergies among such large scale computing paradigms. this proceedings volume presents the results of the 11thinternationalconference on P2P, Parallel, Grid, Cloud And Internet computing (3PGCIC-2016), held November 5-7, 2016, at Soonchunhyang University, Asan, Korea
Clouds Lisp distributed Environments (CLIDE) is a distributed, persistent object-based symbolic programming system being implemented on the Clouds distributed operating system. LISP environment instances are stored as...
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ISBN:
(纸本)0818621443
Clouds Lisp distributed Environments (CLIDE) is a distributed, persistent object-based symbolic programming system being implemented on the Clouds distributed operating system. LISP environment instances are stored as large-grained persistent objects, enabling users on many machines to share the contents of these environments through interenvironment evaluations. CLIDE provides a comprehensive research environment for distributed symbolic system language, invocation and consistency semantics, and an implementation vehicle for the construction of the symbolic processing portions of complex megaprogrammed systems.
A distributed processor level fault diagnosis algorithm is proposed where every processor will come up with its own conclusion about the status of other processors and also the links connecting it to its neighboring p...
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ISBN:
(纸本)0818621443
A distributed processor level fault diagnosis algorithm is proposed where every processor will come up with its own conclusion about the status of other processors and also the links connecting it to its neighboring processors. Performance is improved by considering a dynamic testing strategy where each processor is assigned a small number of processors to test it, ideally two. then, when some processors or links fail, a new testing assignment is made among the processors. Simulation results are presented to show that the proposed algorithm is effective in reducing the testing overhead.
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