introduction real time operating system ppt

... University, a testbed for a real-time MIMO system with a broadband air interface has been developed It has been designed for evaluation of concepts and for proposing new realizations The testbed ... outlook on future projects is presented 2 OVERVIEW OF THE SABA REAL-TIME MIMO TESTBED The SABA (smart antennas for broadband access) real-time MIMO testbed is designed for one base station with an ... system and enables real-time processing of the algorithms used The carrier frequency is 10.525 GHz with a bandwidth of 30 MHz Up- and downlink use the same spectrum and are separated in the time

Ngày tải lên: 22/06/2014, 23:20

... studies on real- time systems and real- time operating systems Martin [1] describes the concept of Real- time System (RTS) A System is considered to be real- time system if ... Besides, a real-time control subsystem is built into the operating system to deploy real-time tasks and scale to real-time applications. In this hybrid operating system, the real-time tasks share ... applications, real- time systems are categorized into soft real- time systems and hard real- time systems according to their performance of response time A hard real- time system fails

Ngày tải lên: 11/09/2015, 16:07

... creation of these advanced designs A Real-Time Operating System (RTOS) offers an application developer a number of aids that allow a complex design to be completed in a timely fashion, permit easy integration ... the termsinterchangeably within this document Integrating Microchip Libraries with a Real-Time Operating System Trang 2EXAMPLE 1: MAIN LOOP FROM TCP/IP STACK The sample code in Example 1 shows ... libraries will be compiled to execute in a particular run-time ment, they have generally been written to assume that environ-no underlying operating system exists; instead, thelibraries will execute

Ngày tải lên: 11/01/2016, 17:04

... Real-time Systems Week 2: Real-time Operating System (RTOS) Ngo Lam Trung Dept of Computer Engineering NLT, SoICT, 2014 Content  Real-time operating system (RTOS)  Components ... completion of operating system calls occurs within known timeframes NLT, SoICT, 2014 Performance  Fast enough to fulfill timing requirements  The more deadlines to be met the faster the system's ...  Better reliability Scalability Faster performance (in real-time contexts) Reduced memory requirements Support for diskless embedded systems Better portability to different hardware platforms

Ngày tải lên: 30/01/2020, 00:56

... play: • At every RTOS TIMER interrupt (usually Timer 2 or Timer 0, every one millisecond). • At any other interrupt from other timers or external inputs. • Whenever an RTOS system command is issued ... Trang 1PaulOS: Part II An 8051 Real-Time Operating System Download free books at Trang 4Download free eBooks at bookboon.comClick on the ... would be able to take the necessary precautions. Forgetting to re-start a timer: We might turn off a timer to re-load the timer register values or to read the counter in an interrupt service routine

Ngày tải lên: 13/01/2021, 03:14

... comparisons of the entire encoding time, where the encoding time reduction ΔT is presented as ΔT = T × 100%, Torg (33) where Torg and T are the entire encoding time of the original XVID encoder ... Takala, and H Chen, “Laplacian modeling of DCT coefficients for real-time encoding,” in Proceedings of IEEE International Conference on Multimedia and Expo (ICME ’08), pp 797–800, Hannover, Germany, ... results show that the proposed model can reduce more redundant computations and achieve better real-time performance than the reference in the literature at the cost of negligible video quality

Ngày tải lên: 22/06/2014, 00:20

... Multicast 8 10 10 11 System Overview 14 3.1 System Entities 3.2 System Initialization 3.3 System Operation 15 16 17 Data Structures and Algorithms 21 4.1 Data Access in Computer Systems 4.1.1 Memory ... network-based real-time group communication system Unlike conventional Instant Messaging systems, which are well known for their abilities to handle one-to-one communication on the fly, this system ... these essential system entities, the system is ready for operation 3.3 System Operation Figure 3.2 System operation In the network depicted in Figure 3.2, the messaging system is set

Ngày tải lên: 08/11/2015, 16:40

... threecolor components), and because it is a color system with which many program-mers and end users are familiar with (it’s common to several operating systems).The BeOS defines rgb_color as a struct ... of 256 colors A pixel value in the range of 0 to 255 is used as an index into a color map This system color map isidentical for all applications That means that when two programs use thesame ... defining analpha byte, which is used to specify a transparency level for a color Trang 3RGB Color SystemAs listed above, the BeOS supports a number of color spaces The RGB colorspace is popular

Ngày tải lên: 26/01/2014, 07:20

... Messages When the program refers to a system message by its Be-defined constant, such as B_QUIT_REQUESTED or B_KEY_DOWN, what’s really of interest is the what data member of the system message. The value ... messages and handle them. For the most part, system messages are handled automatically; for instance, when a B_ZOOM message is received, the operating system zooms the window. But you cannot completely ... object that provides a means for the system to recognize the control as a unique entity. When the control is selected by the user, it is this message that the system will send to the window that

Ngày tải lên: 26/01/2014, 07:20

... static means that from the time your application launches until the time it terminates, you can always rely on the font having the same look. Of course, there will be times when your application ... a line of text written in each of the three system fonts. Contradictory as it sounds, the user can change the font that’s used for any of the global system fonts. Figure 8-2 shows that the FontPanel ... you are assured that the user will view the same font each time that global font pointer is used by your application. Using a global system font You’ve already seen how to specify one of the global

Ngày tải lên: 26/01/2014, 07:20

... down version of operating system IOS l Non-volatile RAM (NVRAM) Ÿ Stores startup configuration (including IP addresses, Routing protocol) l Flash memory - Contains the operating system (Cisco IOS) ... Principles Inside the Router l Routers are computers l Router CPU and Memory l Internetwork Operating System l Router Bootup Process l Router Ports and Interfaces l Routers and the Network Layer ... are Computers Leonard Kleinrock and the first IMP l A router is a computer: Ÿ CPU, RAM, ROM, Operating System l The first router: used for the Advanced Research Projects Agency Network (ARPANET):

Ngày tải lên: 09/03/2014, 13:20

... sense-and-respond KM system that can respond in real time would need to consider the holistic and collective effect of: B real-time deployment in terms of tech and human infrastructure (inputs); B real-time ... businesses... destroyed in real time Given the dominant and intensive role of real- time information, many of the technologies associated with real- time response were initially ... expert systems have focused on such processes Our focus in this article is on the ‘ real- time enterprise’’ logic in which inter-connected value-chains can respond in real- time to

Ngày tải lên: 23/03/2014, 02:20

... microarrays to real-time label-free detection systems would enable a paradigm shift in our ability to understand protein interactions with biomole-cules at the proteome scale Real-time label-free ... molecule used to probe the target proteins on the arrays The emergence of sensitive real-time label-free detection systems that use probes of local index of refraction [e.g surface plasmon resonance ... microarrays and the real-time label-free detection of interactions using probes of the local index of refraction, carbon nanotubes and nanowires, or microelectro-mechanical systems cantilevers

Ngày tải lên: 23/03/2014, 15:21

... such event occurrence in real-time by monitoring tweets?” This paper presents an investigation of the real-time na-ture of Twitter and proposes an event notification system that monitors tweets ... sensors at time 0 and n0e −λt sensors at time t. Therefore, the number of sensors we expect at time t is n0(1− e −λ(t+1) )/(1 − e −λ). Consequently, the probability of an event occurrence at time t ... or so The delay can result from the time for posting a tweet by a user, the time to index the post in Twitter servers, and the time to make queries by our system We apply classification for 49,314

Ngày tải lên: 30/03/2014, 16:20

... total time of 136 µs This result shows that the proposed design, and its hardware implementation, of an eye state recognition system is very suitable to work in a real- time system ... the total time to process the image of an eye with 136 × 82 pixels in this system is 136 µs This is a hardware implementation of an eye state recognition for real time Competing ... presented in [5] has many stages which make it slow. As a result, this method cannot be used in a real-time system. Conditions such as light from different angles, dark eyelashes, eyebrows image located

Ngày tải lên: 21/06/2014, 19:20

... and NTP timestamps of SR; Records the system time when SR is received; Else If (RTCP RR is received) If (SSRC of RR = SSRC of SR) and (TLSR of RR = NTP timestamp of SR) RTT = (system time when ... VF-1 VF-2 VF-3 VF-4 66744 us 66744 us System time in sec System time in usec RTP timestamp (1/90K sec) 0.8 0.85 0.9 0.95 1 PRUF (%) 12345 Link repair time (seconds) w/o I-EPD 256K With I-EPD ... packet discards (I-EPD) for real-time video streaming over a multihop wireless ad hoc network. In a multihop wireless ad hoc network, the quality of transferring real-time video streams could be

Ngày tải lên: 21/06/2014, 23:20

... file system hierarchy Any operating system needs to save numerous files: from system configuration files, to log files or user files etc. In general, each operating system uses its own file system ... such as list all. Currently, most operating systems in use are multi-user and multi-task. This means that more than one user can work on the system at the same time, car- rying out one or more ... dealing with on our system are highly critical and we cannot, in any circumstances, allow ourselves to lose them, we can also configure the operating system not to use the disk cache system. At all events,...

Ngày tải lên: 08/03/2014, 23:20

... 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 ... the 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. ... for different data types may vary from system to system. For example, in a workstation, the value of sizeof(int)is 4 (bytes), whereas on fixed-point DSP systems, the value of sizeof(int)is typically...

Ngày tải lên: 25/01/2014, 19:20

... model certain class of real- time systems like a biphase mark protocol [31]. The Alur-Dill timed automata framework [1] is arguably the best known framework to model a real- time system, and is the ... mutual 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 ... parametric safety verification of real- time systems in which “correct orderings of events” needed for system correctness are maintained by timing constraints on the systems’ behavior. By using EOA,...

Ngày tải lên: 07/03/2014, 17:20