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Multi-display environments (MDE) are replacing single-display environments (SDE) to increase productivity of users. Although, little research of MDEs was conducted in domains of limited use of computer system. One such domain is pharmacy, in which computer systems are used by pharmacists to effect payment, search for medicines and offering services to patients. In this preliminary study we conducted...
Nowadays, the requirement of reliability and fault-tolerance for measurement and control systems become more and more significant. A design of high-availability hot-swap based on compact PCI(CPCI) bus is proposed to solve the problems in applying and testing the modular redundancy and fault-tolerance in the systems. And a semi-physical simulation platform would be designed that could test the hot-swap...
Voltage source inverters are essential systems in many applications. Thus, the diagnosis of the faults that could appear in these systems allows detecting, isolating, and identifying the faults. In this context the teaching of this subject is becoming very important. However, laboratory experience is fundamental in order to provide a real understanding of this subject. This paper presents a computer...
Data backup in data center networks (DCNs) is critical to minimize the data loss under disaster. This paper considers the cost-efficient data backup for DCNs against a disaster with ε early warning time. Given geo-distributed DCNs and such a ε-time early warning disaster, we investigate the issue of how to back up the data in DCN nodes under risk to other safe DCN nodes within the ε early warning...
In cognitive radio networks, cognitive users are allowed to use the licensed portions of spectrum, as long as no harmful interference affects the primary (licensed) users. Towards achieving this goal, spectrum sensing is an essential process to determine spectrum access opportunities for the cognitive users. In wide spectrum applications, it is recommended to distribute the sensing task of the required...
To predict lower bounds on the performance of applications, the cloud should provide guarantees on bandwidth that each virtual machine can obtain. By competing for spare network bandwidth, current solutions that provide bandwidth guarantees can achieve work conservation as well. However, they usually fail to provide accurate bandwidth guarantees, for the interference between traffic for achieving...
Users context is exploited by an increased number of applications, especially mobile ones, in order to provide their clients with context-oriented services. With our work we try to extend the usage context to laptop and desktop applications and environments. This paper aims analyzing user behavior on three different habitats: at work, at school and at home. The main purpose of this paper is to find...
This paper proposes a method for network reconfiguration to minimize the system power loss and maximize voltage profile while satisfying operating constraints. The proposed method is used to obtain the status of the switches through Ant Colony Optimisation (ACO) technique. The backward forward sweep method is used to calculate the power flow in a radial distribution system and the power loss reduction...
Scheduling for mixed-criticality (MC) systems needs to consider priority promotion in LO mode in order to be prepared for the immediate utilization increase when switching to HI mode. An established method for that is the use of virtual deadlines. The EDF-VD (Earliest Deadline First with Virtual Deadlines) algorithm applies a uniform deadline scaling with only one scaling factor x. A generalization...
We demonstrate an approach to build a selector into ReRAM (memristors) using engineered materials. In this approach, a segment(s) of “nonlinear material” is self-assembled into the conduction channel (s) (filament) of a memristor. The nonlinear material exhibits a highly nonlinear current-voltage characteristic, which gives rise to a nonlinear i-v characteristic of the memristor in the ON state.
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...
A study was conducted at the University of Barcelona (Physics Faculty) to assess the electromagnetic field strengths to which students are exposed in their day-to-day lives. We analyzed different radiofrequency sources (GSM900, GSM 1800, UMTS and Wi-Fi). Our aim was to analyze not only electric field strengths but also absorption, so we considered different scenarios and situations: both empty and...
Internet service providers (ISPs) have been facing heavy competition to attract more users in the mobile data market, along with growing operational costs. Most mobile data plans charge users a fixed fee for a monthly data quota, and any unused data at the end of each month will be wasted. In the beginning of 2015, both AT&T and T-Mobile reinstated rollover data plans with constrained eligibility...
The fact that technology have changed the lives of human beings cannot be denied. It has drastically reduced the effort needed to perform a particular task and has increased the productivity and efficiency. Computers especially have been playing a very important role in almost all fields in today's world. They are used to store large amount of data in almost all sectors, be it business and industrial...
In the study of engineering, experimentation plays a great role in understanding the concepts. Teaching in engineering is always challenging as theoretical study should be augmented with experiments so that students get a feel of the real life applications of the concepts they study. Automation and control laboratory is an area where students can not verify the ladder diagrams, they develop for various...
In this paper a discussion on multilevel inverter using series connected switched input DC sources is presented. Here, less number of switches and input DC sources with opposite polarity are used. A single phase five level inverter is considered for explaining the operating principle of the proposed methodology. Here, SPWM technique is employed for generating pulses. Analysis is carried out with various...
DC-DC Converter is a combination of passive components like inductors, capacitors, diodes and switches. All Classical converters are having low power density and large in size. To increase the power density, micro-power consumption technique is required. Design an electronic circuit the popularly method is voltage lift technique. For compact size, needed more gain and more power density Switched capacitor...
This paper presents the design and analysis of Hybrid DC-DC Step-up converter in continuous conduction mode(CCM). The proposed Hybrid DC-DC boost converter consists of conventional boost converter which incorporates switched capacitor cell-UP1. It provides high DC-DC voltage conversion(60V-380V) and eradicates the complexity in conventional boost converter while operating in high duty ratio [2]. A...
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