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Real-time locking protocols employ progress mechanism(s) to ensure that resource-holding jobs are scheduled. These mechanisms are required to bound the duration of priority-inversion blocking (pi-blocking) for jobs sharing resources. Examples of such progress mechanisms include priority inheritance and priority donation. Unfortunately, some progress mechanisms can cause any job, including those that...
This paper presents the first real-time multiprocessor locking protocol that supports fine-grained nested resource requests. This locking protocol relies on a novel technique for ordering the satisfaction of resource requests to ensure a bounded duration of priority inversions for nested requests. This technique can be applied on partitioned, clustered, and globally scheduled systems in which waiting...
This paper addresses the problem of scheduling periodic parallel tasks on a multi-resource platform, where tasks have real-time constraints. The goal is to exploit the inherent parallelism of a platform comprised of multiple heterogeneous resources. A resource model is proposed, which abstracts the key properties of any heterogeneous resource from a scheduling perspective. A new scheduling algorithm...
In this paper, we present a review on the recent progress of real-time experiments for optical OFDM with detailed description on real-time O-OFDM transmission system and digital signal processing algorithms.
This paper presents the design and some aspects of implementation of a highly dependable, safety-oriented kernel for real-time applications. It is specifically designed as an execution facility for a deterministic semi-formal model -- the OASIS model -- which allows to express and verify temporal behaviors and communications of a safety critical real-time application. This paper shows specifically...
Recent years have seen an increasing interest in the scheduling of mixed-criticality real-time systems. These systems are composed of groups of tasks with different levels of criticality deployed over the same processor(s). Such systems must be able to accommodate additional execution-time requirements that may occasionally be needed. When overload conditions develop, critical tasks must still meet...
To overcome the shortage of single-thread in communication efficiency, a new model called multithread serial communication which of Windows CE was built. First structured a serial class function, then created the threads and solved the problems that threads could not be synchronized. After being implemented the project of injection manipulator hand-held devices, executive equipments had been accelerated,...
The verification of new intelligent robotic control algorithm not only requires the correction of computation but also satisfies the timing constraints. In this paper, a synchronized Petri nets model of robot control software is presented, in which an event set is introduced to indicate the start and end of a task module in control software design. With the help of the concept of inhibitor arc, the...
Rough sets theory can eliminate the redundant and imprecise information effectively and correctly in fault diagnosis, which improve the real time and has much advantage of transforming afterwards and regular equipment logistics support to real-time logistics support. So the research on equipment fault diagnosis based on rough sets theory has much signification. The paper applies one advanced reduction...
When locking protocols are used in real-time systems, bounds on blocking times are required when ensuring timing constraints. While the term “blocking” is well-understood in the context of uniprocessor real-time systems, the same is not true in the multiprocessor case. In this paper, two definitions of blocking are presented that are applicable to suspension-based multiprocessor locking protocols...
Tasks scheduling is one of the most important challenges in embedded hard-real-time systems. The problem is known to be NP-Hard and exhaustive search algorithms have no significant benefit in large-scale context. This paper proposes a scatter search based approach for mono-processor systems with timing, precedence and exclusion constraints with no preemption. An empirical study is undertaken and comparison...
Today many business applications are generating fast, multiple, continuous and time varying data streams which are not manageable from available ETL (Extraction, Transformation and Loading) technology. This work gives architecture to extend the real time data warehouse for efficient handling of data streams while keeping traditional functionalities. The paper focuses on the data stream processing...
This paper reviews real-time (RT) Ethernet and discusses special requirements for numerical control (NC). Then such a real-time Ethernet - EtherMAC (Ethernet for Manufacture Automation Control) is presented. EtherMAC uses master-slave communication structure. The master device supports standard Network Interface Card (NIC), and the slave device has a modified one - removing CSMA/CD (Carrier Sense...
This paper implements an embedded system current industrial communication protocol. It is based on the fastest EtherCAT, as fast as a PC-based system. The EtherCAT Slave module is easily used due to the Master System composed of the Embedded System.
We present a novel technique for synthesizing controllers for distributed real-time environments with safety requirements. Our approach is an abstraction refinement extension to the on-the-fly algorithm by Cassez et al. from 2005. Based on partial compositions of some environment components, each refinement cycle constructs a sound abstraction that can be used to obtain under- and over-approximations...
In recent years, real-time database technology in the military data fusion system has been closely followed and applied more and more. In order to complete the design of background database for data fusion system, first analyzed the data fusion system's requirements on database system, and then the organizational structure was determined, the real-time protocol was designed to process the real-timing...
After describing the framework and features of ?? online classroom real-time generating and on-demand system??, this thesis mainly focus on the plan, design and implementation of two subsystems: ?? Online classroom real-time generating subsystem?? and ?? online classroom on-demand subsystem??. Some key techniques are discussed at full length, which mainly include recording and controlling the process...
Based on the IEEE 1588, a Prediction-based Fairness Control (PFC) algorithm is proposed. It improves the real-time performance of star topology industry control Ethernet. The channel load is detected by delay measurement. Data flow is regulated according to the whole channel load. The main functions of this algorithm are as follows: controlled nodes are controlled to guarantee the communications of...
To support predictable large-scale real-time delivery on the future Internet is critical to many emerging applications such as large-scale cyber physical systems (CPSs). In this paper, we address this important issue by exploiting the synchronized global time and develop a scalable predictable real-time delivery framework. We introduce the key ideas of the proposed framework, and our initial simulation...
Distributed control systems have been growing explosively and the fieldbus technology has been widely employed for networked data gathering system. However, few Field-bus is real time down to the I(Input)/O(Output) level and most of them have a large number of sub-systems. In this paper we introduce a novel high-speed industry Ethernet bus known as EtherCAT into data gathering system. A networked...
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