This paper presents high-fidelity and simplified computational fluid dynamics modeling approaches within an optimization framework for compound rotorcraft configurations with rotor/propeller aerodynamic interactions. Simulations of axial-flight ducted propeller a rotor/wing test case are first presented to validate the in-house Helicopter Multi-Block 3 solver assess actuator disk/line models ma...

Many defects in manufacturing system are caused by human resources that show the significance of the human resources in manufacturing systems. Most manufacturers attempt to investigate the human resources in order to improve the work conditions and reduce the human error by providing a proper work-rest schedule. On the other hand, manufacturer deal with machine scheduling based on demand and wo...

optimization of maintenance resources to maximize the system availability is a major concern in different manufacturing systems. therefore, a lot of effort is put to construct optimization models to reach the maximum availability level and to reduce the costs of lack of availability. however, despite these efforts, data uncertainty in the real world problems was neglected in proposed models whi...

A program called MVSIS has been developed which optimizes multi-level multi-valued networks (MV networks). We describe what such a network is and the capabilities contained in MVSIS. MVSIS is modeled after SIS, which synthesizes binary multi-level networks, but the logic network of MVSIS is such that all variables can be multivalued each with its own range. Included in MVSIS are almost all the ...

We consider the burst-level congestion control problem in a communication network with multiple traffic sources, modeled as infinite banks of fluid traffic. The controlled traffic shares a common bottleneck node with highpriority cross traffic modeled as Markov-modulated fluid. We introduce a simulation-based congestion control scheme capable of performing effectively under rapidly-varying serv...

Convex optimization problems arising in applications often have favorable objective functions and complicated constraints, thereby precluding first-order methods from being immediately applicable. We describe an approach that exchanges the roles of the objective and constraint functions, and instead approximately solves a sequence of parametric level-set problems. A zero-finding procedure, base...

In1this paper we present a customized approach to performance and area optimization of asynchronous functional blocks. First an abstract model of the block architecture is introduced and an analytical method for throughput maximization is described. Secondly, area optimization can be performed with respect to data dependencies and merged data paths. These methods have been implemented and valid...

In this paper, congruences between holomorphic Hilbert modular forms are studied. We show the best possible level optimization result outside l for l ≥ 3 by solving the remaining case of Mazur principle when the degree of the totally real field is even.