SIMULATION. Feb 1992, Vol. 58 Issue 2, p78, 5 p. chart
Simulation, Telecommunications, Prototype, Tutorial, and Networks
Simulation models of telecommunication networks are valuable tools for evaluating network performance during the design, development, and operational phases of network life. This paper relates the concepts of discrete event simulation to the context of application to the telecommunication field. A range of software, useful to this enterprise, is discussed, the range extending from general-purpose to very problem-oriented languages. Finally, a primitive network simulation model, using the GPSS simulation language, is presented to illustrate the technique. A basic bibliography, categorized by simulation subject, is included. (Reprinted by permission of the publisher.)
Chang, Carl K., Chang, Young-Fu, and Aoyama, Mikio
SIMULATION. Feb 1990, Vol. 54 Issue 2, p71, 9 p. chart Architecture of PBX.
PBX, Real-Time System, Distributed Systems, Simulation of Computer Systems, Software Engineering, Prototype, Feasibility, System Design, New Technique, and Communications Technology
Rapid prototyping has proven to be a promising way of accomplishing a feasibility study. It cuts costs and reduces the complexity of the development of real-time distributed systems. UICPBX is a simulator of Private Branch eXchange (PBX), an important member in the family of telephone switching systems. It has been prototyped using the C language in a Sun workstation environment under UNIX. During the development of UICPBX, techniques of software reusability have been applied. First, a software hierarchy with three layers (kernel, basic supporting and calling functions) is employed according to the functional characteristics of the application system. Secondly, a software library is established to provide an effective environment to support reuse of functions developed at the middle (basic supporting) layer of the software hierarchy. The powerful high-resolution, bit-mapped graphic screen of SUN workstations facilitates effective process monitoring and visualization of multiple real-time tasks. (Reprinted by permission of the publisher.)
SIMULATION. June 1988, Vol. 50 Issue 6, p239, 9 p. chart Flexible Manufacturing System model.
PROLOG, Simulation Languages, Interactive Systems, System Design, Control Systems, Flexible Manufacturing Systems, Computer-Integrated Manufacturing, and Industrial Engineering
A simulation model of an in-line Flexible Manufacturing System has been built using the declarative computer programming language PROLOG. The model is a vehicle for the study of dynamic responses of Flexible Manufacturing System control. Animation of system status and powerful user interaction are essential for this application. A simple but effective structure has been formulated in PROLOG as a core kernel of the simulator. The decision making process is modeled as a set of functional queues. Partitioning of the decision functions permits modeling of complex peer-to-peer coordinated decision making in non-trivial control environments. This offers many advantages over traditional manufacturing simulation systems. The authors describe appropriate strategies for the realization of acceptable computational performance while retaining the powerful benefits of the PROLOG environment. The result is a practical operational system which features an incremental development upgrade path, quick prototyping, fast and clearly understood code changes. (Reprinted by permission of the publisher.)