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Search Results: 1 - 10 of 17461 matches for " Real-Time "
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Tele-care for emergency announcements  [PDF]
Ching-Sung Wang, Chien-Wei Liu, Teng-Wei Wang
Journal of Biomedical Science and Engineering (JBiSE) , 2010, DOI: 10.4236/jbise.2010.38110
Abstract: The first aid and immediately help are very important in an accident. The earlier detection and treatment we do, the better prognosis and health patients have. In the senior populations, it is more important. Once seniors have an accident, not only physically injure in their body, but also mental and social ability, and may have severe sequela. Concerning about these populations, this research design a simple, practical, and portable device of real-time monitoring body activity with sphygmomanometer and pulsimeter. When an accident occurs, the signals go through mobile phone, immediately notify the remote ends and provide first time help.
A State-of-the-Art Survey on Real-Time Issues in Embedded Systems Virtualization  [PDF]
Zonghua Gu, Qingling Zhao
Journal of Software Engineering and Applications (JSEA) , 2012, DOI: 10.4236/jsea.2012.54033
Abstract: Virtualization has gained great acceptance in the server and cloud computing arena. In recent years, it has also been widely applied to real-time embedded systems with stringent timing constraints. We present a comprehensive survey on real-time issues in virtualization for embedded systems, covering popular virtualization systems including KVM, Xen, L4 and others.
Real-Time Communication Method for mHealth Base on Extended XMPP Protocol  [PDF]
Chenjie Shi, Yu Fang
Communications and Network (CN) , 2013, DOI: 10.4236/cn.2013.53B2106

Considering characteristic of mHealth communication and problems of existing methods, this paper presents a real-time communication method for mHealth based on extended XMPP protocol. The method can maintain the role status efficiently and reduce data latency during the communication process. Meanwhile, it can be extended flexibly to meet increasing communication demands of mHealth services. Furthermore, a system framework is presented to support telemonitoring scene. Finally, system implementation and feasibility tests verify the effectiveness of the method and framework.

Alternative Approach for Studying Contractility of the Isolated Muscle Preparations in Real-Time Mode  [PDF]
Alexander Balakin, Ruslan Lisin, Alexey Smoluk, Yuri Protsenko
Journal of Biomedical Science and Engineering (JBiSE) , 2015, DOI: 10.4236/jbise.2015.89060
Abstract: The real-time control over the observed parameters is known to be necessary during the experiments with biological objects. The use of approaches, such as real-time operating systems, often requires significant material or human resources (operating time, the special administration and programming skills and etc.). In this paper we propose an alternative approach for the implementation of real-time mode in the experiments on muscle preparations (papillary muscles, trabeculae, walls of vessels) based on an external input-output cards with built-in analog-to-digital/digital-to-analog converters and signal processor. As a result, we developed a hardware-software complex for studying the mechanical properties of biological materials (muscles) in real-time mode. This solution has a convenient and easy-to-use user interface, and requires a minimum of computing resources and minimal cost of electricity.
Algorithms of Buffer Management in Active Real-Time Database System
Pranjal S. Bogawar
International Journal of Electronics Communication and Computer Engineering , 2011,
Abstract: Active real-time databases have emerged as a research area in which concepts of active databases and real-time databases are combined into real-time database with reactive behavior. Such systems are envisioned as control systems for environments as diverse as process control, network management and automated financial trading. Sensors distributed throughout the system report the state of the system to the database. Unacceptable state reports typically results in corrective actions being triggered with deadlines. This paper is a study of various buffer management techniques in real time database management system & active real time database management system as well as we implemented few of them. We created ARPLRU (Active Real-Time Priority LRU) and ARPHA (Active Real-Time priority hint algorithm) and compared with PAPER algorithm.
Fast and Flexible Modelling of Real-Time Systems with RTCP-Nets
Marcin Szpyrka
Computer Science , 2004,
Abstract: A large number of formalisms has been proposed for real-time systems modelling. However, formal methods are not widely used in industrial software development. Such a situation could be treated as a result of a lack of suitable tools for fast designing of a model, its analysis and modification. RTCP-nets have been defined to facilitate fast modelling of embedded systems incorporating rule-based systems. Computer tools that are being developed for RTCP-nets, use a template mechanism to allow users to design models and manipulate its properties fast and effectively. Both theoretical and practical aspects of RTCP-nets are presented in the paper.
Time Extensions of Petri Nets for Modelling and Verification of Hard Real-Time Systems
Slawomir Samolej,Tomasz Szmuc
Computer Science , 2002,
Abstract: The main aim ofthe paper is a presentation of time extensions of Petri nets appropriate for modelling and analysis of hard real-time systems. It is assumed, that the extensions must provide a model of time flow an ability to force a transition to fire within a stated timing constraint (the so-called the strong firing rule), and timing constraints represented by intervals. The presented survey includes extensions of classical Place/Transition Petri nets, as well as the ones applied to high-level Petri nets. An expressiveness of each time extension is illustrated using simple hard real-time system. The paper includes also a brief description of analysis and veryication methods related to the extensions, and a survey of software tools supporting modelling and analysis ofthe considered Petri nets.
Formal Verification of Real-Time System Requirements
Marcin Szpyrka
Computer Science , 2000,
Abstract: The methodology of system requirements verification presented in this paper is a proposition of a practical procedure for reducing some negatives of the specification of requirements. The main problem that is considered is to create a complete description of the system requirements without any negatives. Verification of the initially defined requirements is based on the coloured Petri nets. Those nets are useful for testing some properties of system requirements such as completeness, consistency and optimality. An example ofthe litt controller is presented.
On the Quantum Entanglement Reinterpretation Using the Time as Real Instantaneous Signal Field  [PDF]
Elsadig Naseraddeen
Journal of Modern Physics (JMP) , 2017, DOI: 10.4236/jmp.2017.86054
Abstract: In relativistic mechanics the time-like vector characterize the motion in spacetime with speed faster than the speed of light in vacuum c in which the line element ds2=c2dt2-dx2-dx2-dz2 is less than zero (where is infinitesimal change in time, and are infinitesimal change in space), thus the time in relativistic mechanics can instantaneously flow [1], however in quantum mechanics although the time is treated as unobservable parameter (without any Hermitian observable operator have engine-value equivalent to time) any two physical quantity described by two non-commuting observable operators\"\"and \"\" fulfill \"\", the knowledge of one immediately produce the knowledge of the other [2], thus in quantum mechanics if two particles interacted in finite temporal epoch and then separated in space the gaining of knowledge by the local measurement of physical quantity runs on one them (for example the measurement of spin direction of one particle using Stern-Gerlach experiment) immediately produce the knowledge of the complementary physical quantity of the other particle (for example the opposite spin direction of the other particle), this simply called quantum entanglement the concept that so much advanced after publication of the Jon Bell’s 1964 celebrated paper [3] in which he illustrated that we can add parameters to quantum mechanics to determine the results of individual measurements, without changing the statistical predictions, and then he conclude “there must be a mechanism whereby the setting of one measuring device can influence the reading of another instrument, however remote. Moreover, the signal involved must propagate instantaneously so that such a theory could not be Lorentz invariant”. The question now what these signals that can propagate instantaneously? The answer in this paper will be the time signals field which is defined for each constituent matter particle M and at each space point P as the measure of the total length of all occupation and leaving epochs of P by M which is representing a sequence function compactly supported only at the space point occupied by it and indexed by the number of occupation epochs of P by M, thus the
FEL-H Robust Control Real-Time Scheduling  [PDF]
Bing Du, Chun Ruan
Journal of Software Engineering and Applications (JSEA) , 2009, DOI: 10.4236/jsea.2009.21010
Abstract: The existing scheduling algorithms cannot adequately support modern embedded real-time applications. An important challenge for future research is how to model and introduce control mechanisms to real-time systems to improve real-time performance, and to allow the system to adapt to changes in the environment, the workload, or to changes in the system architecture due to failures. In this paper, we pursue this goal by formulating and simulating new real-time scheduling models that enable us to easily analyse feedback scheduling with various constraints, overload and disturbance, and by designing a robust, adaptive scheduler that responds gracefully to overload with robust H∞ and feedback error learning control.
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