1.1. Intervals. We shall denote by I a finite set of closed intervals of the real line. Investigations of combinatorial properties of intervals started by Gy. Hajós (1957, [40]) T. Gallai ([26]) S. Benzer (1959, [8]) P. C. Gilmore and A. J. Hoffman (1964, [7]) D. R. Fulkerson and O. A. Gross (1965, [22]) C. G. Lekkerkerker and J. Ch. Boland (1962, [57]). It is traditional to display a set of in...

the research on project scheduling has widely expanded over the last few decades. the vast majority of these research efforts focus on exact and suboptimal procedures for constructing a workable schedule, assuming complete information and a static deterministic problem environment. project activities are scheduled subject to both technological precedence constraints and resource constraints, mo...

I investigate the behaviour of a multiproduct monopolist supplying vertically di®erentiated varieties of the same good. The discrete model adopted here allows to obtain a continuous model when, in the limit, the number of varieties becomes in ̄nitely large. The main ̄nding establishes that the tendency on the part of the monopolist to undersupply all qualities but the top one can take two alterna...

One of the most important issues in strategic management is enhancing employees’ motivation to contribute in the implementation of strategies; because they usually do not pay necessary attention to strategies. Accordingly, it is required to consider and calculate their roles in implementing strategies. In terms of employees’ role in the organization, they have managerial (goal setter) and/or no...

nowadays organization especially r&d; centers are dealing with project portfolio selection decisions under uncertainty. moreover in the most of the past research, project portfolio selection and scheduling are often considered to be independent problem. this leads to insufficient result in real world. so in this research simultaneous project portfolio selection and scheduling problem is modelin...

The study examines production efficiency of farmers under National Fadama-II Project in Oyo State Nigeria. Primary data were collected from two hundred and sixty-four farmers using multistage sampling technique. The analytical framework used for the study include: descriptive, infrastructure index, gross margin and stochastic frontier production function. Average infrastructural index in the ar...