Nobuhiro Hamada

Load Flow Convergence in the Vicinity of a Voltage Stability Limit

Because load flow problems are expressed as sets of nonlinear simultaneous equations, they have no unique solutions. In this paper a region where a set of initial values converges to a stable load flow solution under specified conditions, is investigated theoretically when the Newton-Raphson method is applied to a set of nodal power equations expressed in either polar or rectangular coordinates. The results are tested in load flow calculations on a 28-node power system and the convergence characteristics for the two types of coordinates are compared.

An automatic finite state machine synthesis using temporal logic decomposition

Since conventional methods to synthesize a finite state machine (FSM) assign binary codes to all the nonredundant states, they do not exploit delay latches which are sometimes effective in simplifying machine structure. The authors propose a novel method to synthesize an FSM by applying a time shift operation on both inputs and outputs of the FSM. Therefore, the FSM is decomposed into a smaller-scale FSM and two combinational logic circuits including the delay latches. One of the combinational logic circuits is attached to the input part of the FSM and the other is attached to its output part. The algorithm is evaluated for several benchmark examples of FSMs, from which it is concluded that the FSM can be synthesized with 5% less hardware by applying the proposed algorithm.<<ETX>>

VLSI logic design with logic programming and knowledge-base technology

An approach to VLSI logic design using partial and general structural specifications in addition to behavioral specifications is developed. This approach requires a new style of programming technique, especially if a universal solution procedure for all types of architectures is needed. Knowledge of the design process involves unification of the heterogeneous (i.e. behavior and structure) information between a system and its parts, as well as representation of functional modules in order to ensure their reusability in an efficient manner. Following these strategies, a logic synthesis expert system, ProLogic, is developed, and the system is evaluated using MPU-type VLSIs. It is found that the universal connecting procedure for any compound functional module that unifies the behavioral and structural specifications between a total module and its parts improves logic design efficiency by a factor of 2 and that logic programming, object-oriented frames, and rule bases implemented in ProLogic improve software productivity by a factor of 5. >

VLSI logic design with logic programming and knowledge base technology

A logic-synthesis expert system called ProLogic was developed, and the system was evaluated for some MPU-type VLSIs. A universal connecting procedure for any compound functional module was proposed which unified the behavioral and structural specifications between a total module and its parts, so that the efficiency of logic design was improved by a factor of two. Logic programming, an object oriented frame, and a rule base were applied and implemented in Prolog, so that software productivity was improved by a factor of five, and an architecture for ProLogic has been build up efficiently through a trial-and-error method.<<ETX>>

G9.1: Software Architecture Display Terminal with Picture Generation of a Graphic Interactive Capability

Abstract Graphic display terminals are being increasingly used for improving the quality of man-machine communications in various applications and development of several graphic terminals has been announced. In summing up the needs of the graphic display terminal, they are (1) higher intelligence of the terminal, that is to say, reducing loads on the host computer; (2) quick response of the terminal; and (3) easy use of the terminal. In order to satisfy these requirements, we have developed a prototype of a color graphic display terminal. In this paper, we describe the approach taken, the functions which the terminal has, and also the evaluation of functional allotment between two processors. Finally, some applications for this graphic display terminal are presented

SOFTWARE ARCHITECTURE OF A GRAPHIC DISPLAY TERMINAL WITH INTERACTIVE PICTURE GENERATION CAPABILITY

Abstract Graphic display terminals are being increasingly used for improving the quality of man-machine communications in various applications and development of several graphic terminals has been announced. In summing up the needs of the graphic display terminal, they are (1) higher intelligence of the terminal, that is to say, reducing loads on the host computer; (2) quick response of the terminal; and (3) easy use of the terminal. In order to satisfy these requirements, we have developed a prototype of a color graphic display terminal. In this paper, we describe the approach taken, the functions which the terminal has, and also the evaluation of functional allotment between two processors. Finally, some applications for this graphic display terminal are presented.

An Optimal Scheduling in an Automated Warehouse System Controlled by a Process Computer

Abstract Recently, automated warehouse systems controlled by process computers have used optimal schedules. They are discrete systems and their characteristics are described in terms of statistical relations between space and time. This paper discusses the model and design philosophy of a warehouse operation system. Then, it develops each operating subsystem, such as a packing or a delivery system, through the use of mathematical optimization programming. Finally it evaluates the proposed systems. These proposed systems include a storage system improving the accommodation of load between aisles, and a pallet assignment system increasing transfer capability at a small sacrifice of storage capability.