Pedro Fernandes Ribeiro Neto

Implementation of transactions scheduling for real-time database management

The results of transactions processing in realtime database must to satisfy the temporal constraints associated to both transactions and data, besides maintaining the logical consistency imposed to them. In order to solve this problem, we present the implementation of real-time transactions scheduling considering semantic concurrency control technique. As results, the best execution sequence of the transactions operations must be produced, where the transactions maximum amount attends its deadlines using valid data. This paper describes the schedule implementation using threads class in Java.

Analysis of periodic transactions and semantic concurrency control for real-time databases using colored Petri nets

We deal with the analysis of semantic concurrency control as well as the scheduling of periodic transactions with hard deadlines for real-time databases (RTBD). A coloured Petri net based method as well as analytical techniques are adopted. The resulting model allows the behavioral analysis taking into account the semantic concurrency control for an effective RTDB application. Also, we define the valid schedules satisfying data and periodic transaction logical and temporal restrictions.

Integration of routing and time synchronization protocols for wireless sensor networks

When dealing with Wireless Sensor Networks (WSN) applications that demand a high level cooperation of the sensor nodes, time synchronization is necessary to provide the correctness required for their results. In this work, we show that common issues between routing and time synchronization processes make their integration possible and, thus, can solve the problems of the resources consumption and time spent to acquire the synchronization. Two proposals for integrating them are presented.

Mobile Technologies Applied to Hospital Automation

Industrial automation has been the focus of many studies owing to the need for increased production in the market and constant technological developments. Thus, the concepts of industrial automation have been incorporated into the medical area for some time, and are now being used in hospital automation. However, the hospital environment still not being properly automated and the automation that does exist is only found in a few processes. Several studies have been developed and are usually addressed most of the problems involved in processes with automation potential, such as: security, communication, reliability and performance of applications, biomedical devices, systems usability, logical and temporal consistency, among others.

A delay-sensitive strategy for real-time monitoring in wireless sensor networks

Advances in the research of Wireless Sensor Networks (WSN) have allowed their use for several purposes, including monitoring of critical and dangerous environments. Applications in these environments share the need of operation without human intervention, which imposes autonomy and efficiency in executing their tasks, even under critical environmental conditions. Besides the traditional WSN physical limitations, their utilization as a source of collecting data in challenging environments requires the ability to support real-time observations of the monitoring environment. These observations should consider not only environment unpredictability with respect to mobility but also the variable amount of nodes and collected data. To deal with that, in this paper we propose a delay-sensitive strategy, which aims to enable WSN for monitoring challenging environments, taking into account real-time data constraints as well as mobility and limitations of the sensor nodes. This strategy is implemented in a new routing protocol, called PROST.

Designing Solutions-Based Ubiquitous and Pervasive Computing: New Issues and Trends

Designing Solutions-Based Ubiquitous and Pervasive Computing: New Issues and Trends examines current practices and challenges faced by designers of Ubiquitous and Pervasive Computing projects. Analyzing theoretical assumptions, empirical research, practical implementations, and case studies, this book intends to present a comprehensive yet concise overview of the recent progress in ubiquitous and pervasive computing applications, as well as discuss new methodologies, technologies and approaches currently practiced. Truly interdisciplinary, this publication serves as a valuable reference for researchers in the fields of electrical engineering and computer science, students, educators, and industrial trainers interested in network sensors, embedded systems, distributed systems, computer networks, and computer science.

SiMoS: Sistema para monitoramento de plataformas de poços de petróleo através de dispositivos móveis

The popularization of the Web and the advent of new information and communication technologies of mobile devices make possible new aspects for management, interaction and information sharing. In petroliferous area, monitoring systems on mobile devices have been used for process optimization, data monitoring, reporting, alarm generation and identification of failures in real-time on oil wells platforms. However, there are few systems that identify efficiently problems due the fact they do not use techniques of real-time systems. This paper proposes the new system, SiMoS, a real-time system for remote monitoring oil wells platforms through mobile devices.

QoS management for real-time DataBases in embedded systems

Real-time database management systems (RT-DBMS) have the necessary characteristics for providing efficient support to develop applications in which both, data and transactions have temporal constraints. However, in the last decade, new applications were identified and are characterized by a large geographic distribution, high heterogeneity, lack of global control, partial failures and lack of safety. Besides, they need to manage large data volumes with real-time constraints. Scheduling algorithms should consider transactions with soft deadlines and the concurrency control protocols should allow conflicting transactions to execute in parallel. The last ones should be based in their requirements, which are specified through both quality of services functions and performance metrics. In this work, a method to model and develop applications that execute in open and unpredictable environments is proposed. Based on this model, it is possible to perform analysis and simulations of systems, to guide the decision making process and to identify solutions for improving it. For validating the model, a case study considering the application domain of sensors network is discussed.

Query language in systems with hard real-time constraints

In order to provide the news demands that a real-time database needs to work properly, some improvements have been proposed in aspects well done like concurrency control, scheduling and query language. In the perspective of obtain better results, despite the accomplished efforts, these problems continuous been studied. In this paper we introduce a new query language for real-time database (QL-RTDB), thats an extension of the structured query language (SQL-99). Besides the new functionalities of the extended language presented, we also show its implementation with the applied results obtained.

Modelling and Analysis of Real-Time Databases for Sensor Networks Using Coloured Petri Nets

Abstract In the last years, the application of sensor networks has been increased. Also, the software development requirements for such systems are getting more complex. The data storage and processing techniques, for these environments, are insufficient for the new requirements. In this paper, we develop and analysis a model for the integration of real-time database technology with an embedded sensor network systems, to tackle such deficiencies. The hierarchical Coloured Petri nets formal method is used to describe the formal model. We detail the analysis of functional and temporal properties related to the sensor network and a real-time database server.