The Infona portal uses cookies, i.e. strings of text saved by a browser on the user's device. The portal can access those files and use them to remember the user's data, such as their chosen settings (screen view, interface language, etc.), or their login data. By using the Infona portal the user accepts automatic saving and using this information for portal operation purposes. More information on the subject can be found in the Privacy Policy and Terms of Service. By closing this window the user confirms that they have read the information on cookie usage, and they accept the privacy policy and the way cookies are used by the portal. You can change the cookie settings in your browser.
In an era of mobile internet and big data, how to make the data access more efficient is worth researching because the mobile computing environments have some limitations such as the narrow bandwidth, the frequent disconnections of network and so on. To improve the response time of query, a good cache system is of vital importance. Besides, a good cache consistency method is essential to ensure the...
This paper proposed a coordinated expansion planning for data centers and cyber routes in the cyber and electricity networks. The objective is to determine the location and capacity of the data center as well as the required cyber routes to serve the demand in the cyber networks considering the imposed constraints of the electricity and cyber networks. The installation cost of the data centers and...
Mobile devices have become an important part of our life. Service disruptions can occur because of limited resources of mobile devices such as computation, storage and battery. In this context, mobile cloud computing enables mobile devices to offload their computation and storage to the cloud and get the final result from cloud servers. There are some parameters like bandwidth, delay, jitter and user...
Given a distributed service support system S realized on a cloud (e.g., replicated data services), QoS assessment captures the SLA violations that may arise under various resource depletions and outages faced by S. The issue of less-than-100% guarantee of QoS arises due to the lax control of the underlying cloud resources and components that is typical of third-party providers. Our goal is to reason...
We address the problem of analyzing the mean delay experienced by end-users in a Content Distribution Network (CDN) consisting of a set of surrogate (cache) servers connected via persistent TCP connections over the Internet cloud to a set of remotely located origin servers. We first consider the simplest scenario of a single cache server and a single origin server. Taking into account several factors...
In order to make the performance of Electrical Engineering Virtual Lab meet growing customer demand, this paper makes an improvement on the architecture of load-balancing cluster on Linux Virtual Server, and proposes a genetic optimized BP neural network algorithm to improve the currency performance and stability of the cluster.
Mobile-Edge Computing (MEC) is about offering application developers and service providers cloud-computing capabilities and an IT service environment at the edge of the mobile network. However, although cloud computing can be used to meet traditional challenges, like scalability concerns and provide for fast resource provisioning times, a multifaceted analysis is required when it comes in multi-operator...
Computational offloading can improve the energy efficiency of mobile devices, by executing some tasks of a mobile application in the cloud. In this paper, a new algorithm called 'Dynamic Programming with Randomization' (DPR) is presented. The DPR algorithm iteratively improves an offloading decision vector, by generating random bit strings with a biased probability of generating 0s, which represent...
Modern datacenters employ server virtualization and consolidation to reduce the cost of operation and to maximize profit. However, interference among consolidated virtual machines (VMs) has barred mission-critical applications due to unpredictable performance. Through extensive measurements of RUBBoS n-tier benchmark, we found a major source of performance unpredictability: the memory thrashing caused...
Current cloud users pay for statically configured VM sizes irrespective of usage. It is more favorable for users to consume (and be billed for) just the right amount of resources necessary to satisfy the performance requirement of their applications. We take a novel perspective to enable such resource usage, where we assume that the cloud operator exposes a small, dynamic fraction of its infrastructure,...
Adaptive content streaming is frequently used as an efficient and cheap solution to achieve a good quality for media streaming, in systems having light Over-the-Top architectures. The streaming system developed here makes an initial optimized server selection based on multi-criteria algorithms and then in-session media adaptation. The focus of this paper is on performance analysis (based on real-life...
This paper mainly analyzes the impact of the maximum transmission unit (MTU) on application performance by using OPNET. Simulation models are created and amount of experiments for typical FTP applications are conducted. Based on comparisons with different MTU value and different scenarios corresponding to the FTP upload response time, optimal settings are found.
Network Functions Virtualization (NFV) is a paradigm designed to promote service agility and able to quickly generate revenue, thus encouraging competition among companies in the computer network industry. Besides the advocated benefits of NFV, management requirements should be properly taken into account. The choice of a particular NFV-based technology must consider its management requirements. However,...
The strategy to provide Open Educational Resource Repository (OER) for sharing among e-Learning systems to support lifelong Massive Open Online Courses (MOOCs) in Thailand was proposed. The framework integrates the Open Educational Resources system and MOOCs system by using an invented FedX extension for exchange resources between the repository systems. The proposed framework is designed for scalable...
TCP and UDP are two important protocols in the network transport layer. In this paper, we study the effects of TCP and UDP on the performance of the application. Based on OPNET simulation software, a simple FTP application simulation model was created and the experiment was carried out. In order to test the influences of different transport protocols on the performance of application in different...
Competition is always a good thing in IT world. It forces us to do our best. Nowadays, in the area of cloud computing, it is at the peak between the larger number of cloud users and cloud providers who view for the opportunity to use and provide services. Competition among cloud users means the price of cloud services never fall very low and between cloud providers mean the price of services never...
Ethernet has been gaining momentum as the network technology supporting complex embedded systems. In this work-in-progress paper we recover a previous proposal for using the FTT-SE protocol to provide hierarchical traffic scheduling using sporadic servers and thus support component-based design approaches. In particular, we carry out initial steps towards the timing analysis of such composition, identifying...
The usage of Road Side Units (RSUs) acting as a buffer point in VANETs alleviates the intermittent vehicle-to-vehicle (V2V) connectivity problem. However, due to the vehicle mobility and the short RSU-transmission-range, a vehicle dwells short time inside an RSU. Nevertheless, quick response from the RSU server, helps a driver to make a quick decision while driving. Network coding is known to be efficient...
Software-Defined Networking (SDN) is a brand-new networking technology which promises to provide flexible architecture and power features. However, performance is always a major concern in deploying SDN. In this paper, we demonstrate how a naive SDN network may suffer from long delay for the first packet in a session, and we propose a "Look Ahead Mechanism" to shorten the delay time. In...
Cloud computing has been proposed as a new paradigm to deliver services over the internet. The proliferation of cloud services and increasing users' demands for computing resources have led to the appearance of geo-distributed data centers (DCs). These DCs host heterogeneous applications with changing characteristics, like the CPU-load correlation, that provides significant potential for energy savings...
Set the date range to filter the displayed results. You can set a starting date, ending date or both. You can enter the dates manually or choose them from the calendar.