resource limitation in zero time may cause to some profitable projects not to be selected in project selection problem, thus simultaneous project portfolio selection and scheduling problem has received significant attention. in this study, budget, investment costs and earnings are considered to be stochastic. the objectives are maximizing net present values of selected projects and minimizing v...

this study presents the effects of project uncertainties on nonlinear time-cost tradeoff (tct) profile of real life engineering projects by the fusion of fuzzy logic and artificial neural network (ann) models with hybrid meta-heuristic (hmh) technique, abridged as fuzzy-ann-hmh. nonlinear time-cost relationship of project activities is dealt with ann models. ann models are then integrated with ...

This paper investigates two integer linear programming models that integrate requirement scheduling into software release planning. The first model can schedule the development of the requirements for the new release exactly in time so that the project span is minimized and the resource and precedence constraints are satisfied. The second model is for combined requirement selection and scheduli...

We study the effect of incorporating heterogeneity into default rules by examining the choice between retirement plans at a firm which transitioned from a defined benefit (DB) to a defined contribution (DC) plan. The default plan for existing employees varied discontinuously depending on their age. Employing regression discontinuity techniques, we find that the default increased the probability...

DRAFT This document is a preliminary draft. It has not been formally released by the U.S. Environmental Protection Agency and should not be construed to be Agency policy. It is being circulated for comments on its technical merit and policy implications. Do not release. Do not quote or cite. are thanked for their capable assistance in the final assembly and formatting of this research plan. Fol...

1 Summary This project proposal suggests research in a key area of embedded computer systems, namely how to obtain modularity and flexibility together with the necessary performance and cost efficiency. The research focuses on reconfigurable solutions at all system levels, taking advantage of technological developments and breakthroughs that have emerged recently. We will study the applicabilit...

A key question in conditional planning is: how many, and which of the possible execution failures should be planned for? One cannot , in general, plan for all the failures that can be anticipated: there are simply too many. But neither can one ignore all the possible failures, or one will fail to produce suuciently exible plans. We describe a planning system that attempts to identify the contin...

being observed frequently that projects cannot achieve to their plan duration and their budget. utilizing retrospective method is one of the reasons for this problem. in this research two method, earned duration management and risk management, has been used to remove the gap of the plan and the reality; this enable the project to utilize both high accuracy of the first method and prophecy of th...