Major Challenge for deploying Ethernet in metro area networks is to guarantee the quality of service and traffic engineering requirements. In the literature, there are many forwarding strategies proposed by researcher...
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Major Challenge for deploying Ethernet in metro area networks is to guarantee the quality of service and traffic engineering requirements. In the literature, there are many forwarding strategies proposed by researchers to overcome this challenge. One significant difficulty in assessing and comparing the different forwarding strategies proposed is the lack of a standard test environment or benchmark. Currently in the absence of a standard benchmark, each researcher considers some typical test environments to demonstrate the performance achievement of his proposed forwarding strategy. In some cases, the test environment is so far from realistic environments. A Metro Ethernet Forwarding benchmark must include some standard architecture, standard workloads, and a standard set of evaluation criterions. This paper describes the features of the analytical and experimental benchmarks mostly used in related works for the evaluation of forwarding strategies in metro Ethernet networks.
The recent meteoric rise in the use of smart phones and other mobile devices has led to a new class of applications, i.e., micro-apps, that are designed to run on devices with limited processing, memory, storage and d...
The recent meteoric rise in the use of smart phones and other mobile devices has led to a new class of applications, i.e., micro-apps, that are designed to run on devices with limited processing, memory, storage and display resources. Given the rapid succession of mobile technologies and the fierce competition, micro-app vendors need to release new features at break-neck speed, without sacrificing product quality. To understand how different mobile platforms enable such a rapid turnaround-time, this paper compares three pairs of feature-equivalent Android and Blackberry micro-apps. We do this by analyzing the micro-apps along the dimensions of source code, code dependencies and code churn. BlackBerry micro-apps are much larger and rely more on third party libraries. However, they are less susceptible to platform changes since they rely less on the underlying platform. On the other hand, Android micro-apps tend to concentrate code into fewer files and rely heavily on the Android platform. On both platforms, code churn of micro-apps is very high.
An intelligent scheduling algorithm based on multi-agents and genetic algorithm is proposed to overcome flexible job-shop automation and optimization problems in manufacturing industry. The algorithm is made of a mana...
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An intelligent scheduling algorithm based on multi-agents and genetic algorithm is proposed to overcome flexible job-shop automation and optimization problems in manufacturing industry. The algorithm is made of a management-agent, a scheduling-agent and *** scheduling is realized by a customized genetic algorithm,while dynamic scheduling is realized by these coordinative agents. Several scenarios are used to illustrate that the proposed system is practical, efficient and advanced.
In this paper, we summarize the results of the Pattern Driven engineering of Interactive Computing Systems (PEICS) which took place at the 3rd ACM SIGCHI Symposium on engineering Interactive Computing Systems (EICS) 2...
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Wireless HART is a state-of-the-art solution for a time-division multiple-access (TDMA) based wireless private area network. It combines slow frequency-hopping and a TDMA scheme that utilizes a centralized a-priori sl...
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Wireless HART is a state-of-the-art solution for a time-division multiple-access (TDMA) based wireless private area network. It combines slow frequency-hopping and a TDMA scheme that utilizes a centralized a-priori slot allocation mechanism. In this paper we conduct a performance evaluation of the Wireless HART TDMA protocol and provide insights into the major factors impacting energy consumption. These insights provide valuable guidance on where to start with any effort geared towards saving energy. The main contributions of this paper are two folds: (i) We conduct a sensitivity analysis of the Wireless HART TDMA energy consumption parameters using the response surface methodology. Based on these results we determine the most influential parameters for the total energy consumption. (ii) We evaluate and discuss the impact of time synchronization and types of link scheduling algorithms on the performance of Wireless HART TDMA protocol.
Safety cases capture a structured argument linking claims about the safety of a system to the evidence justifying those claims. However, arguments in safety cases tend to be predominantly qualitative. Partly, this is ...
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Safety cases capture a structured argument linking claims about the safety of a system to the evidence justifying those claims. However, arguments in safety cases tend to be predominantly qualitative. Partly, this is attributed to the lack of sufficient design and operational data necessary to measure the achievement of high-dependability goals, particularly for safety-critical functions implemented in software. The subjective nature of many forms of evidence, such as expert judgment and process maturity, also contributes to the overwhelming dependence on qualitative arguments. However, where data for quantitative measurements can be systematically collected, quantitative arguments provide benefits over qualitative arguments in assessing confidence in the safety case. In this paper, we propose a basis for developing and evaluating the confidence in integrated qualitative and quantitative safety arguments. We specify a safety argument using the Goal Structuring Notation (GSN), identify and quantify uncertainties therein, and use Bayesian networks (BNs) as a means to reason about confidence in a probabilistic way. We illustrate our approach using a fragment of a safety case for an unmanned aircraft system (UAS).
We have investigated real-time DSP algorithms implementing electronic predistortion and optical OFDM. These studies have been carried out through experiments with FPGA-based transmitters, and the design and post-synth...
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We have investigated real-time DSP algorithms implementing electronic predistortion and optical OFDM. These studies have been carried out through experiments with FPGA-based transmitters, and the design and post-synthesis simulations of transceiver ASICs.
We consider geographically distributed datacenters forming a collectively managed cloud computing system. Multiple SaaS providers host their SOA-based, context-aware applications in the cloud. Typically, the context-a...
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We consider geographically distributed datacenters forming a collectively managed cloud computing system. Multiple SaaS providers host their SOA-based, context-aware applications in the cloud. Typically, the context-aware applications serve multiple classes of customers (end users) classified on economic considerations, which determine the Quality of Service (QoS) received by each class. This need for differentiated QoS for each customer class is incorporated into a Service Level Agreement (SLA) negotiated between the context-aware application provider and the cloud provider. A QoS metric that has been explored in large distributed applications is the percentile of response times, this metric provides a form of guarantees on the shape of the response time distribution for the customer. Typical SLAs require the response time of a certain percentile of the input requests from particular classes of customers to be less than a specified value, if this value is exceeded, a penalty is charged to the cloud provider. In addition, the applications we consider are data-intensive with strict temporal order constraints that have to be enforced on requests within the same session of a customer. We propose Data-aware Session-grained Allocation with gi-FIFO Scheduling (DSAgS), a novel decentralized request management scheme deployed in each of the geographically distributed datacenters, to globally reduce the penalty charged to the cloud computing system. Our simulation evaluation shows that our dynamic scheme far outperforms commonly deployed management policies (typically employing static or random allocation with First In First Out, Weighted Round Robin or dynamic priority-based scheduling). We further optimize our solution for dynamic, data-intensive context-aware applications, by proposing a "context level" cache replacement policy. Our evaluation shows that, when used in conjunction with DSAgS, the replacement policy decreases the total penalty charged to the cloud.
According to the current rapid development of wireless communication technology and various users of data services needs of business and rapid growth, more features need to be added and widely used in data enquire, al...
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Wireless multimedia quality of service (QoS) support the basic objective is that in the bandwidth limited circumstances, provision and users pay a considerable quality of service. To establish the right business model...
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