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Next-generation networks (NGNs) are embracing two key principles of software defined networking (SDN) paradigm functional segregation of control and forwarding plane, and logical centralization of the control plane. A centralized control enhances the network management significantly by regulating the traffic distribution dynamically and effectively. An eagle-eye view of the entire topology opens up...
Network functions virtualization is an emerging technology that can significantly improve the flexibility of network service provisioning and offer potential cost savings. However, it is critical that service providers offer high reliability and availability of the network and services when moving from proprietary hardware appliances to virtualized network functions on commodity servers. In a network...
This paper studies how to extract and group essential nodes to guarantee loop freedom during the update of the network, while minimizing update time. We propose a model to establish the relationships of loops which may arise during the updating procedure. Given the model, we design a heuristic algorithm, with the recursive optimizing for the relationships, to extract essential nodes for the loop-free...
An experimental evaluation of an LTE Cognitive Radio (CR) Network, implemented using highly integrated Software Defined Radio (SDR) platform is presented. Each transceiver can be configured as a primary (resp. secondary) eNodeB or a primary (resp. secondary) user in this framework. We propose simple distributed algorithms which the secondary eNodeB can employ to efficiently manage the spectral opportunities...
This paper proposes an improved structure for none-isolated Multi-Input (MI) high step-up dc-dc converters. The bidirectional power flow operation can also be provided for the proposed topology. Unlike most of none-isolated none-coupled inductor based topologies, the proposed topology can produce high voltage gains with low voltage stress on the switches/diodes. Due to the simple structure of proposed...
The paper focuses on the design and implementation of the control algorithm for the experimental model of an active DC traction substation, paying particular attention to the design flaws and DSP implementation unforeseen problems. The design flaws combined with unforeseen behavior of the DSP control board can lead to system faults like short-circuits or overvoltage and can produce destructive malfunctions...
Somewhat Homomorphic Encryption (SHE) schemes allow to carry out operations on data in the cipher domain. In a cloud computing scenario, personal information can be processed secretly, inferring a high level of confidentiality. Most practical Somewhat Homomorphic Encryption (SHE) schemes require the implementation of fast polynomial arithmetic, that is why hardware accelerators usually target the...
Prevailing network technologies separate control and data planes embedded within networking devices. Problems with this are expensive maintenance of closed-technology network devices and the inability to enforce coherent network-wide policies. Software Defined Networks (SDN) solves these problems with logical centralization based on open standards that use existing networking equipment. Quality of...
Program comprehension procedure have been attracted a lot of attentions and have been investigated using a variant methodologies such as thinking aloud, summary analysis, and Eye-tracking. Program comprehension tools main objective is understanding source code which is substantial factor in software maintenance activities. Visualization is a popular approach in earning this understanding. This paper...
Network policy description languages (PDLs) enable the unambiguous specification of network behaviour. Due to the increasing number of PDLs and new and emerging network paradigms (eg: software defined networking) there is a need for tools to analyze these languages in an effective, efficient, and consistent manner. In this paper we present a taxonomy for policy description languages to help compare,...
One of the main technologies of cloud computing is virtualization. Virtualization allows Virtual Machines (VMs) to share physical resources simultaneously resulting in higher utilization of hardware resources and lower infrastructure costs. With the proliferation of VMs, the importance of virtual switches (vSwitches) comes to the forefront. The concept of network virtualization is connecting VMs using...
This paper presents improvements upon a previous paper detailing an Android mobile phone application demonstrating methods for implementing or assisting traditional speech therapy techniques using mobile devices. [1] After development, the software was implemented on a Galaxy Tab, an Android tablet that, at approximately $100 per tablet, is quite affordable. The techniques are principally aimed at...
Information-centric networking (ICN) can bring many benefits to network operators, e.g., in-network request resolution via router's cache, and name-based forwarding. However, creating a smooth migration path from the current IP network to the ICN is a challenging task that must be investigated. Network function virtualization (NFV) is one of the key technologies to achieve this migration because of...
This paper describes the modern Immersive 3D Visualization Lab (I3DVL) established at the Faculty of Electronics, Telecommunications and Informatics of the Gdańsk University of Technology (GUT) and its potential to prepare virtual tours and architectural visualizations on the example of the application allowing a virtual walk through the Coal Market in Gdańsk. The paper presents devices of this laboratory...
Software Defined Networks (SDNs) provides a separation between the control plane and the forwarding plane of networks. The software implementation of the control plane and the built in data collection mechanisms of the OpenFlow protocol promise to be excellent tools to implement Machine Learning (ML) network control applications. A first step in that direction is to understand the type of data that...
Receiver diversity related conformance tests of 2G/3G cellular devices either with multipath propagation or not typically would utilize RF channel emulator (or RF fader) to balance the dual downlink signal levels before reception by dual receiver antennas of device. The RF fader has capability to close loop output power level, so it allows user to set the desired output level. With this capability,...
Software Defined Networking (SDN) uses a logically centralized controller to replace the distributed control plane in a traditional network. One of the central challenges faced by the SDN paradigm is the scalability of the logical controller. As a network grows in size, the computational and communication demand faced by a controller may soon exceed the capabilities of a commodity server. In this...
Solid State Drives (SSDs) have become popular for mobile devices and PCs nowadays due to their advantages compared with conventional hard disk drives. However, they suffer from endurance problems. An effective approach to increase the endurance of an SSD is to improve the management algorithm of the RAM buffer, a cache-like structure inside the SSD. There are several previous studies of RAM buffer...
Wireless sensor network (WSN) TestBed design challenges can be divided into three main sub-categories: architectural, hardware and software. By considering all these challenges, an optimal solution was found and EDI TestBed created. In this paper, a method, which solves software related problems in large scale WSN TestBed, such as how to distribute computational resources, control all of the TestBed...
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