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New data intensive applications, which are continuously emerging in daily routines of mobile devices, significantly increase the demand for data, and pose a challenge for current wireless networks due to scarce resources. Although bandwidth is traditionally considered as the primary scarce resource in wireless networks, the developments in communication theory shifts the focus from bandwidth to other...
Partial discharge (PD) is one of the predominant factors to be controlled to ensure reliability and undisrupted functions of power generators, motors, Gas Insulated Switchgear (GIS) and grid connected power distribution equipment, especially in the future smart grid. The emergence of wireless technology has provided numerous opportunities to optimise remote monitoring and control facilities that can...
NAND flash is seeing increasing adoption in the data center because of its orders of magnitude lower latency and higher bandwidth compared to hard disks. However, flash performance is often degraded by (i) inefficient storage I/O stack that hides flash characteristics under Flash Translation Layer (FTL), and (ii) long latency network protocols for distributed storage. In this paper, we propose a minimalistic...
Software-defined networking (SDN) is well-known of its programmable and centralized management mechanism of networks. The controller unit in SDN enables users to determine network behaviors by defining flow rules on programmable switches in SDN. In this paper, we briefly propose a novel concept of network storage systems. Unlike most network storage systems store files on hosts and access files through...
Virtual network operators may distrust each other and require that their virtual infrastructure is not cohosted on the same physical equipment. In this paper, we formulate a virtual network embedding problem that maximizes the total revenue where conflicting virtual network operators utilize distinct physical devices. Virtual links in our model have the option of selecting among a range of discrete...
The millimeter wave (mmWave) bands are likely to play a significant role in next generation cellular systems due to the possibility of very high throughput thanks to the availability of massive bandwidth and high-dimensional antennas. Especially in Non-Line-of-Sight conditions, significant variations in the received RF power can occur as a result of the scattering from nearby building and terrain...
Research on network virtualization has been active for a number of years, during which a number of virtual network embedding (VNE) approaches have been proposed. These approaches, however, neglect important operational requirements imposed by the underlying virtualization platforms. In the case of SDN/OpenFlow-based virtualization, a crucial example of an operational requirement is the availability...
In this paper, we presents a detailed investigation of the impact of underlap channel on the analog/RF performance of Dopant Segregated Schottky Barrier MOSFET (DS-SB-MOSFET) on ultrathin body silicon-on-insulator (SOI). Using 2D simulations, the major analog/RF performance metrics such as transconductance (gm), output conductance (gd), transconductance generation factor (gm=ID), cut-off frequency...
This paper describes the implementation of a preconditioned CG (Conjugate Gradient) method on GPUs and evaluates the performance compared with CPUs. Our CG method utilizes SP (Splitting-Up) preconditioner, which is suitable for parallel processing because other dimensions except for one dimension are independent. In order to enhance the memory bandwidth to the global memory of GPUs, our implementation...
This paper describes the implementation of a preconditioned CG (Conjugate Gradient) method on GPUs and evaluates the performance compared with CPUs. Our CG method utilizes SP (Splitting-Up) preconditioner, which is suitable for parallel processing because other dimensions except for one dimension are independent. In order to enhance the memory bandwidth to the global memory of GPUs, our implementation...
Universal Serial Bus 3.0 is one of the much sought after communication based protocols that acts as an interface between computers and other electronic devices. With a well defined SuperSpeed of 5 Giga bits per second, it provides backward compatibility to its predecessors. It suits for small devices which are not self powered. It has an increased bandwidth and power save states that are enhanced...
We report the design of a new application-specific integrated circuit (ASIC) for use in radio telescope correlators. It supports the construction of correlators for an arbitrarily large number of signals. The ASIC uses an intrinsically low-power architecture along with design techniques and a process that together result in unprecedentedly low power consumption. The design is flexible in that it can...
In this paper we describe the process used to create the interference waveform used in radiated interference testing and demonstrate two examples of how such a signal may be used in testing the performance of wireless devices. Our goal is to simulate, in a laboratory environment, typical to worst-case conditions for wireless electronic safety devices used by emergency responders. The methods discussed...
Due to an explosive growth of Internet applications, the amount of data has increased enormously. In order to store and process this big data more efficiently, a solid-state device (SSD) has replaced a hard disk drive (HDD) as a primary storage media. In spite of high internal bandwidth, SSD has its performance bottleneck on the host interface whose bandwidth is relatively low. To overcome the problem...
The proliferation of smart phones combined with increasing mobile data demand, cellular network operators around the world are considering various ways to augment network capacity. To meet the projected 1000x increase capacity by 2020 [3], a holistic approach is needed. The proposed solutions include hyper-dense small cell deployment, intelligent utilization of existing spectrum and offloading to...
Infrastructure as a service (IaaS) is a form of cloud computing, which converts physical machines (PMs) to various types of resources by virtualization technology, and delivers these resources to customers by a on-demand way. However, different customer requirements complicate the usage of resources. In this paper, we employ a high level formalization way, Performance Evaluation Process Algbra (PEPA),...
Ship Reporting Systems (SRSs) have been standardized with the goal of enforcing safety in navigation. Automatic Identification System (AIS) is the most known SRS but, given the limited available bandwidth, it supports a simple, basic set of services without dealing with security aspects. Specifically to address such weaknesses, this paper explores a possible backward-compatible solution aimed at increasing...
By improvements of ICT (Information and Communications Technologies), a lot of advanced high speed communication standards such as 3G (3rd generation mobile telecommunications), LTE (Long Term Evolution) and High speed WLAN (Wireless Local Area Network) have been developed. Recently, most devices destined for consumer use, equip more than one communication interface based on the above high speed communication...
This paper presents multiband split ring fractal patch antenna. The proposed geometry is based on square ring in which a slit is inserted on one side and finally the sides are replaced with the Minkowski curve. The proposed geometry is simulated in HFSS using FR4 and RT Duroid as the substrate material. The 0th and 1st iterations of the design are compared minutely in terms of return loss, bandwidth,...
The DARPA RadioMap program focuses on large-area near-real-time spectrum situational awareness. The program seeks to make this capability affordable through using opportunistic distributed devices as the sensor network; that is, through adding spectrum measurement functions to devices such as tactical radios and jammers already deployed for other purposes. This paper provides an overview of the approach...
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