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In this paper, we design a game theoretical framework for improving the Quality of Service (QoS) in cooperative RAN caching. Considering the cooperation under both single cell transmission and joint transmission, the QoS metric is uniformly quantified as the total content delivery time. Although the formulated cooperative content placement problem is proved NP-hard, noticing the local cooperative...
Live Virtual Machine (VM) migration offers a couple of benefits to cloud providers and users, but it is limited within a data center. With the development of cloud computing and the cooperation between data centers, live VM migration is also desired across data centers. Based on a detailed analysis of VM deployment models and the nature of VM image data, we design and implement a new migration framework...
Higher-level SCADA control centers are continuously implemented, upgraded and optimized. One of the most important SCADA software on the market is IGSS. It is frequently used in the water sector due to its appreciated characteristics. The paper presents a solution to optimize IGSS SCADA resources in the context of integrating water and waste water pumping stations into a higher level SCADA system,...
Internet of Things (IoT) devices are typically deployed in resource (energy, computational capacity) constrained environments. Connecting such devices to the cloud is not practical due to variable network behavior as well as high latency overheads. Fog computing refers to a scalable, distributed computing architecture which moves computational tasks closer to Edge devices or smart gateways. As an...
Widespread use of mobile terminal has promoted the rapid movements of information service technology. This paper analyzes the shortcomings of service capabilities in the case of the lack of infrastructure, and presents a service persistence method in mobile environment. Based on distributed service deployment, multiple backup and service session switch and other mechanisms, this method effectively...
Users often do not watch an online video content in its entirety, and abort the video before it is completed. This is captured by the notion of audience retention rate, which indicates the portion of a video users watch on average. A decentralized coded caching scheme, called partial coded caching (PCC), is proposed here to take into account both the popularity, and the audience retention rate of...
Software-defined Networking (SDN) is a promising network architecture for future internet applications by seperating the control and data layer of computer networks. On the other hand, Application Layer Traffic Optimization (ALTO) protocol provides ISP-friendly communication by provisioning network related information to the applications. In this paper, we propose a method for selecting appropriate...
Algorithms in robotics typically tend to expose several parameters for the user to configure. This allows both reusability and fine tuning of the algorithm to a particular setup, but at the expense of significant effort in tuning, since this task is typically done manually. However, recent results in parameter optimization have shown to be quite successful, namely in automatic configuration of boolean...
We study a single location supply system for repairable spare parts. The system consists of a multi-server repairshop and inventory of ready-to-use spare parts. When a failed part is received, a new (or as-good-as-new) replacement (if on stock) is sent back, and the failed part is queued for repair. In the case of unavailability, the failure requests are fulfilled when a ready-for-use part is received...
the aims of this study is to analyze staff scheduling in the Hotel X in Kuwait, as well as, reducing waiting time in queue and developing effective customer service through finding the optimal employees schedule without hiring new staff. The study will be approached by building a simulation model using Arena in order to optimize employees scheduling within reception and housekeeping department during...
Energy is a critical resource for apps that run on mobile de- vices. Among all operations, making HTTP requests is one of the most energy consuming. Previous studies have shown that bundling smaller HTTP requests into a single larger HTTP request can be an effective way to improve energy efficiency of network communication, but have not defined an automated way to detect when apps can be bundled nor...
As JavaScript is becoming increasingly popular, the performance of JavaScript programs is crucial to ensure the responsiveness and energy-efficiency of thousands of pro- grams. Yet, little is known about performance issues that developers face in practice and they address these issues. This paper presents an empirical study of 98 fixed performance issues from 16 popular client-side and server-side...
In this work, we propose a bidding policy for cloud users to reduce the instance rental bill by using the spot instance. Our approach is based on the recently developed two-timescale Lyapunov Optimization framework. It is shown that our approach is effective to save the instance rental cost.
New media has increased communication between people all over the world and the Internet. Problems can be solved by centralized management of SDN controller in 5G, such as security and limited bandwidth in new media. An authentication server and a database server are connecting to the same switch. SDN controller generates a flow table routing to the authentication server, when it receives requirements...
Content delivery networks are a key infrastructure component used by Video on Demand (VoD) services to deliver content over the Internet. We study a content delivery system consisting of a central server and multiple co-located caches, each with limited storage and service capabilities. This work evaluates the performance of such a system as a function of the storage capacity of the caches, the content...
When user-generated data such as audio and video signals are used to train machine learning algorithms, users' privacy must be considered before the learned model is released. In this work, we present an open-source library for privacy-preserving machine learning framework on smart devices. The library allows Android and iOS devices to collectively learn a common classifier/regression model from distributed...
Data centers have been widely used in many pervasive computing applications. This paper shows the cost-aware virtual machine allocation problem for off-grid green data centers is an integer programming problem which is NP-hard. The paper presents a cost-aware virtual machine allocation algorithm which attempts to utilize renewable energy sources and minimize the energy cost of fossil fuel while maintaining...
The goal of software testing is to find defects before the product is released to the customer. Siemens has a Zero Defect Culture which strives to continuously improve our software testing methods. The current methods use automated testing and manual testing. This paper examines the use of mixed-strength covering arrays, resulting in requiring fewer tests for higher strength coverage. Using the Combinatorial...
This paper focuses on placement and chaining of virtualized network functions (VNFs) in Network Function Virtualization Infrastructures (NFVI) for emerging software networks serving multiple tenants. Tenants can request network services to the NFVI in the form of service function chains (in the IETF SFC sense) or VNF Forwarding Graphs (VNF-FG in the case of ETSI) in support of their applications and...
Internet users are interested in content regardless of its location; however, the current client/server architecture still requires requests to be directed to a specific server. Information-centric networking (ICN) is a recent vein that relaxes this requirement through the use of name-based forwarding, where forwarding decisions are based on content names instead of IP addresses. Despite previous...
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