Yosef S. Sherif

Applications of fuzzy set theory

A state-of-the-art review of the literature related to applications of fuzzy set theory, with special emphasis on fuzzy industrial controllers, is presented. It is demonstrated that fuzzy set theory is applicable to a wide range of practical problems and that simple fuzzy control algorithms do give good results.

Computer software quality measurements and metrics

Abstract Currently, an increasing number of researchers and organizations are recognizing the importance of software quality and the significance of characterizing and dealing explicitly with software quality attributes by addressing the establishment of quality measures and metrics. A software metric is an objective mathematical measure of software that is sensitive to differences in software characteristics. It provides a quantitative measure of an attribute which the body of software exhibits. There is general recognition of the fact that absence of metrics leads to lack of control over software systems and finally to failure. This paper investigates and analyzes quality measures, controls and metrics in various phases of software development and puts forward information about the state-of-the-art and the state-of-the-practice in computer software quality measurements.

The search for quality: The case of planned obsolescence

Abstract Planned obsolescence involves a design plan that is intended to hasten existing products to become undesirable (not necessarily below that of competitive offerings) either functionally or psychologically and consequently to be replaced by new products. Many manufacturing companies since the last decade have adopted the policy of planned obsolescence in their products. Their main objective is to cut costs, increase profits and secure continuous consumption and production. When this policy is abused, however, so that customers are not getting products which can perform adequately and safely for a reasonable amount of time, the end result may prove to be more detrimental than beneficial, not only to producers and consumers but to the nation as a whole. In this age of scarce resources, energy shortages and new challenges, this paper re-examines planned obsolescence and searches for quality in todays products.

Z-Basic algorithm for collision avoidance system

A Z-Basic prediction algorithm for an aircraft ground-based collision avoidance system is presented. This system searches for mutually overlapping prediction intervals that are influenced by the aircrafts maneuver capabilities and surveillance accuracy. Z-Basic provides a powerful, fast, interactive, simple to use, and inexpensive Basic compiler. The algorithm is applied to a typical terminal airspace situation. The computer program was executed on Macintosh+, and the execution was less than one minute. The program is easy to understand and implement. >

The Sherif-Dear simple (SDS) Theorem in number theory

Abstract We put forward a theorem in number theory called the SDS Theorem, prove it by enumeration, and cite some relevant applications.

Program solves N-job, M-machine sequencing problem

Abstract The objective of this program is to find a schedule that minimizes the completion time (make-span) of all jobs, and in so doing it also minimizes the idle time on the last machine in a flow shop problem.

Using Walsh Functions to Test a New Composite Sherif-Dear (CSD) Random Number Generator:

A test using Walsh functions is performed to test the quality of the output of a new Composite Sherif-Dear (CSD) random number generator. The Walsh functions based test shows that the output of the (CSD) generator satisfies the criteria of good random number generators.

Modelling the firing tables of field artillery (cannon 105 mm howitzer)

Abstract In some areas the procedure for firing heavy field artillery requires the look-up of sets of firing tables. This paper proposes to model the firing tables by a family of functions which can be utilized by microcomputers. In so doing, the manual calculation of firing procedure will be substituted by a computerized one which has the advantages of speed and accuracy. Besides, utilizing this proposed model in microcomputers is more advantageous than storing the whole firing tables in the computer memory since the latter method requires large memory size that may impede the mobility and flexibility of the firing control system.