applications use real time operating system

Ngày tải lên: 01/01/2014, 18:47

... release time of the jth instance of task τ i ; G.C. Buttazzo, , Real- Time Systems Series 24, DOI 10.1007/978- - -0 - _ , Hard Real- Time Computing Systems: Predictable Scheduling Algorithms and Applications 1 ... queue. Operating systems that handle different types of tasks may have more than one ready queue. G.C. Buttazzo, , Real- Time Systems Series 24, DOI 10.1007/978- - -0 - _ , Hard Real- Time Computing ... systems, space missions, consumer electronic devices, multimedia systems, smart toys, and virtual reality. In many cases, the real- time computer running the application is embedded into the system...

Ngày tải lên: 01/04/2014, 17:20

Ngày tải lên: 22/06/2014, 23:20

Ngày tải lên: 23/06/2014, 01:20

Ngày tải lên: 24/08/2014, 12:08

Ngày tải lên: 21/06/2014, 22:20

Ngày tải lên: 28/06/2014, 02:20

Ngày tải lên: 12/05/2013, 10:21

... the order of FIR filter L. This is especially true in real- time applications where the input sequence is of infinite duration. In order to use the efficient FFT and IFFT algorithms, the input sequence ... algorithm. There are two classes of FFT algorithms: decimation-in -time and decimation-in- frequency. In the decimation-in -time algorithm, the input time sequence is successively divided up into smaller sequences, ... samples of data. The execution time of the fft function depends on the input data type and the sequence length. If the input data is real- valued, it computes a real power-of-two FFT algorithm...

Ngày tải lên: 28/10/2013, 05:15

... phone systems include both the infrastructure such as the cellular base-stations and the handsets all use DSP processors. Some of the systems use general-purpose DSP processors, while others use ... of communication systems. In this chapter, we will introduce some selected DSP applica- tions in communications that played an important role in the realization of the systems. 9.1 Sinewave Generators and Applications When ... in Section 9.3. 9.2 Noise Generators and Applications Random numbers are useful in simulating noise and are used in many practical applica- tions. Because we are using digital hardware to generate...

Ngày tải lên: 06/11/2013, 18:15

... discrete -time linear time- invariant system. Let x(n) be the input sequence and y(n) be the output sequence of the system. If h(n) is the impulse response of the system, the output signal of the system ... xn); title( `Time- domain signal x(n)'); xlabel( `Time index'); ylabel(`Amplitude'); where title gives the plot with the title `Time- domain signal x(n)', xlabel labels the x-axis with `Time ... Figure B.1, a trivial integer index n is used for the x-axis instead of an actual time index in seconds. To better represent the time- domain signal, we can use the colon operator to generate values...

Ngày tải lên: 25/01/2014, 19:20

... DSP run -time environment, and the host environment. In this section, we will present the data types that are used by the TMS320C55x C compiler. The C55x is designed for real- time DSP applications. ... be used in other programs without being retested. This reusability is a very important issue in the development of large software systems because it greatly reduces development time. 4. The use ... typing firfltr infile coefile outfile <enter> The operating system passes the strings on the command line to main. More precisely, the operating system stores the strings on the command line in...

Ngày tải lên: 25/01/2014, 19:20

... parameter constraints for correct orderings of events in the system. To use EOA, the user models a real- time system by using the time- interval automata (TIA) framework, which is an extension ... only a system with fixed timing parameters, but not a time- parametric system. The parametric timed automata (PTA) framework introduced in [2] is a time- parametric version of the Alur- Dill timed ... exclusion algorithm. 1 Introduction In a typical real- time system, timing constraints on the system s behavior are used to ensure its correctness. Such a system is often modeled by using a set of timing...

Ngày tải lên: 07/03/2014, 17:20

... infrastructure and sentiment model to analyze in real- time public sentiment on Twitter toward the 2012 U.S. presidential candidates. Our effort to gauge political sentiment is based on bringing ... Aggregation Because our system receives tweets continuously and uses multiple rules to track each candidate’s tweets, our display must aggregate sentiment and tweet volume within each time period ... tokenizer 117 because tweets are short and easy to send, they lend themselves to quick and dynamic expression of instant reactions to current events. We expect automated real- time sentiment analysis...

Ngày tải lên: 16/03/2014, 20:20

... unrestricted user utterances because, if the accuracy of under- standing can be improved, systems that allow users to speak freely could be developed and these would be more useful than systems ... spontaneous speech in real time using only pauses. Observation of human-human dialogues reveals that humans of- ten put pauses in utterances and sometimes do not put pauses at utterance boundaries. ... where pauses might appear in an utterance. I'd like to make a reservation for a con- ference room (pause) for, uh (pause) this afternoon (pause) at about (pause) say (pause) 2...

Ngày tải lên: 17/03/2014, 07:20

... operating systems. One force requires a more exible operating system that can accommodate the evolving requirements of new hardware and new user applications. The other force requires an operating ... eld. Even young computer science students know that Operating Systems are the core of any computer system and a course about Operating Systems is more than common in any Computer Science department ... recent operating systems conferences and journals focusing on the “pure” Operating Systems subjects (i.e. Kernel’s task) has produced several main categories of study in Non-Distributed Operating...

Ngày tải lên: 19/03/2014, 13:32

... for Real- Time Systems 7. Performance Analysis Techniques 6. Software Design Approaches 9. Future Visions on Real- Time Systems 1. Fundamentals of Real- Time Systems 3. Real- Time Operating Systems 4. ... mechanisms, are used even in modern real - time applications. Hence, real - time systems knowledge has a long lifetime. Nonetheless, much fruitful development is taking place in real - time systems ... considered real - time; it must simply have response times that are constrained appropriately. When is a system real - time? It can be argued that all practical systems are ultimately real - time systems....

Ngày tải lên: 24/04/2014, 16:03

... processor time. 19.11 Silberschatz, Galvin and Gagne â2005 Operating System Concepts 7 th Edition, Jan 1, 2005 Implementing Real- Time Implementing Real- Time Operating Systems Operating Systems ■ In ... Galvin and Gagne â2005 Operating System Concepts 7 th Edition, Jan 1, 2005 Bus-Oriented System Bus-Oriented System Chapter 19: Real- Time Systems Chapter 19: Real- Time Systems 19.20 Silberschatz, ... 1, 2005 Overview of Real- Time Systems Overview of Real- Time Systems ■ A real- time system requires that results be produced within a specified deadline period. ■ An embedded system is a computing...

Ngày tải lên: 13/05/2014, 00:36

... hard real- time systems, it will use the term real- time system to mean embedded, hard real- time system, unless other- wise noted. 1.1.2.2 The Nature of Time It is typical, in studying real- time systems, ... engineering of real- time systems. 1.3 EXAMPLE REAL- TIME SYSTEMS Embedded real- time systems are so pervasive that they are even found in house- hold appliances and toys. A small sampling of real- time domains ... analysis of real- time systems. Thus, because real- time systems engineering is so multi- disciplinary, it stands out as a highly specialized area. The design and implementation of real- time systems...

Ngày tải lên: 03/06/2014, 01:51

... obtain real- time frame rates. Trying to render at a fixed rate through a system timer is typically not sufficient because the timers tend to be of limited resolution. For example, the WM_TIMER message ... high- level details that arose in the development of the real- time 3D game engine NetImmerse. The expression “game engine” was used because, at the time of the development of NetImmerse, that was what ... a logarithmic -time binary search to determine existence of an element. The ordering also supports logarithmic -time insertion and deletion. Unfortunately, real- time en- gines sometimes have performance...

Ngày tải lên: 04/06/2014, 11:53