Метод передачи данных по сети Ethernet в режиме реального времени
The tools used at design of enterprise architecture are analyzed, their characteristics are described in article . The output that the main problem complicating design process, leading to increase in labor input of work of systems analysts and engineers is the lack of integration tools of the used tools is proved. Approach to a solution of an objective is offered and the general architecture of the developed software is described.
Control and analysis of the timing of computations are crucial to many domains of system engineering, be it, e.g., for ensuring a timely response to stimuli originating in an uncooperative environment or for synchronizing components in VLSI. Reflecting this broad scope, timing aspects of systems from a variety of domains have been treated independently by different communities in computer science and control. Researchers interested in semantics, verification, and performance analysis study models such as timed automata and timed Petri nets, the digital design community focuses on propagation and switching delays, while designers of embedded controllers have to take account of the time taken by controllers to compute their responses after sampling the environment, as well as of the dynamics of the controlled process during this span. Timing-related questions in these separate disciplines have their particularities. However, there is growing awareness that there are basic problems that are common to all of them. In particular, all these subdisciplines treat systems whose behavior depends upon combinations of logical and temporal constraints; namely, constraints on the temporal distances between occurrences of events. Often, these constraints cannot be separated, as intrinsic dynamics of processes couples them, necessitating models, methods, and tools facilitating their combined analysis. Reflecting this fact, the aim of FORMATS is to promote the study of fundamental and practical aspects of timed systems, and to bring together researchers from different disciplines that share interests in modeling and analysis of timed systems and, as a generalization, hybrid systems. Typical topics include (but are not limited to): – Foundations and Semantics: Theoretical foundations of timed systems and languages; comparison between different models (such as timed automata, timed Petri nets, hybrid automata, timed process algebra, max-plus algebra, probabilistic models) – Methods and Tools: Techniques, algorithms, data structures, and software tools for analyzing or synthesizing timed or hybrid systems and for resolving temporal constraints (e.g., scheduling, worst-case execution time analysis, optimization, model checking, testing, constraint solving) – Applications: Adaptation and specialization of timing technology in application domains in which timing plays an important role (real-time software, embedded control, hardware circuits, and problems of scheduling in manufacturing and telecommunication, etc.)
A new look at the problem of constructing a scheduler in the case of a group of strictly periodic tasks is proposed. The structure of the system of periods is represented in terms of graph theory. A criterion for the existence of a conflict-free schedule based on this representation is obtained, and generic schemes of algorithms for constructing such a schedule are described. The proposed approach is illustrated by building schedules for a number of strictly periodic tasks.