Search results for: A Perkusich
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Congestion control algorithms exist for decades to prevent package loss in intense traffic networks. Several solutions developed over the years tried to solve this problem, including the creation of new algorithms. However, hybrid wired and wireless networks, or wired-cum-wireless, common in modern days, bring new challenges to programmers and engineers who try to overcome the numerous new problems...
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This paper presents the use of Asterisk software for teaching telephony in Electrical Engineering and Systems of Telecommunications undergraduate courses at the Federal Institute of Education, Science and Technology of Paraíba, João Pessoa, Paraíba, Brazil. To do this, and to reproduce confidently a real world scenario, the Asterisk software was chosen because it is an open and flexible source, and...
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Control systems are used in industry for process automation and to increase the reliability and dependability when executing critical tasks. Failures in the operation of such systems may cause expensive losses and can compromise the plant safety. Therefore, it is necessary to define techniques, methods and tools to increase the dependability as well as reliability. Verification and validation techniques...
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Integration between Brain Computer Interface and mobile devices allows the development of mobile applications for people with severe neuromuscular diseases. These applications can increase their quality of life. This paper presents a mobile application that enables disabled people to make a phone call to a desired contact on their phone's address book solely using their brain activity.
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Control systems are used to produce a certain result with little or no human supervision. The principal aim of such systems is to ensure that resources are used efficiently and that the desired product quality is achieved. Moreover, for critical systems such as oil and gas plants, it is important to guarantee the safety and reliability of the operation. Therefore, it is necessary to verify whether...
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IEEE Transactions on Computers > 2010 > 59 > 12 > 1625 - 1639
Energy efficiency has become one of the key challenges for a large class of electronic systems. Longer time between battery recharges is highly desirable for battery-powered devices such as mobile phones, digital cameras, Internet tablets, and electronic organizers. Energy efficiency is also important for electronic systems powered from the electric grid since it may reduce power consumption and the...
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UPnP defines an architecture for pervasive peer-to-peer network connectivity of intelligent appliances, wireless devices, and PCs of all form factors and platforms. It is designed to support zero-configuration, ldquoinvisiblerdquo networking, and automatic discovery for a breadth of device categories from a wide range of vendors. UPnP-UP is an extension of the UPnP protocol that provides support to...
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This paper describes a new concept of a location-based remote control. This device analysis the user location and preferences to adapt the environment according to the customer needs. It makes the operation of the remote control easier and more pleasant.
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This paper presents the MoMPt project, an open source project developed to allow access to multimedia content and to control multiple HTPCs remotely using mobile devices. The main contribution in the context of this project is it reference design, which make possible access HTPC functionalities using different technologies, such as UPnP and XML-RPC. In this paper we briefly explain our reference design,...
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The effects of accuracy and delay of the identification of a nonstationary workload of a battery powered device using a dynamic power management technique are analyzed in this paper. The system is modeled by discrete-time Markov chains coupled to the battery model. Such model allows a rigorous mathematical formulation of the problem and to trade-off between performance and battery lifetime.
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With the latest advances in wireless communication, new monitoring and supervisory control tools have been designed for industrial systems, avoiding unexpected failures and greatly improving system reliability and maintainability. Usually supervisory control for electric systems applies wireless sensor networks (WSN). WSN comprises many sensor nodes each one containing a processing unit, one or more...
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Safety Instrumented Systems (SIS) are designed to prevent accidents, avoid undesirable situations and guarantee continuous operation of oil and gas production systems. An interruption in the operation can be caused by faults in sensors and/or actuators. Hence, SIS are integrated to the supervisory control system in order to use the information from sensors to prevent such undesirable situations. In...
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Due the development of new wireless technologies and the advent of new mobile devices, new services and applications are necessary to supply the needs of the users of these devices. Video on-Demand (VoD) services have become one of these services. In this paper we present a P2P Mobile Video on-Demand (VoD) Protocol for mobile devices. Due to different possible communication interfaces that are available...
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Wireless Personal Area Networks (WPANs) have been widely used due to the development of new wireless technologies, mainly Bluetooth. As user mobility is the focus of WPANs some questions arise when developing applications for it, specifically handoff management. Despite Bluetooth having been used for WPAN applications it does not have facilities for handoff management. It provides inquiry and paging...
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In a nutshell, UPnP aims to enable simple and robust connectivity among consumer electronics, intelligent appliances and mobile devices from many different vendors. Nowadays, it is getting an increasing popularity due to its robust way of connecting devices and the massive number of already developed applications, complementing the useful new era of pervasive computing. Although UPnP is an easy-to-use...
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In this work, the problems and respective solutions for dealing with two of the most basic questions regarding handoff management are presented: to avoid total loss of connectivity; and to reduce overall time of the handoff procedure. The focus of this research is on handoff in WPANs for real-time applications. Therefore, Bluetooth stands out as the ideal technology for case study due to its particular...
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2008 IEEE Symposium on Computers and Communications > 1090 - 1095
In a wireless sensor network (WSN), nodes are power constrained. As a consequence, protocols must be energy efficient to prolong the network lifetime. Network simulators are usually used to develop and analyze WSN protocols. However, most simulators employ the linear battery model to simplify the simulation process, leading to wrong conclusions about the network lifetime, because this model does not...
chapter
This paper presents an experimental study of streaming multimedia packets using DCCP transport protocol over 802.11 g networks. Our main focus is to study the behavior of DCCP flows over real-time multimedia applications. The approach taken was to use DCCP flows in the presence of TCP and UDP flows, then analyze the behavior of each protocol, mainly in regards to the congestion control algorithms...
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This paper presents the BRisa UPnP A/V framework. BRisa is a framework that allows users to discover multimedia devices, share, search and render multimedia content over the local networks or remotely through the Internet. It has been developed using UPnP specifications, which makes use of standard Internet protocols and services, such as HTTP, UDP and SOAP. BRisa is composed of three main applications:...
chapter
Open Multimedia Application Platforms (OMAP), such as 161x and 2420, are dual core processors with an Advanced Risk Machine (ARM) and a fixed-point Digital Signal Processor (DSP). The decision of issuing or not part of an application to be executed by the DSP core must be carefully made, because of both, the additional complexity related to the design process, and the time overhead involved with control...
