Volumetric-modulated arc technique (VMAT) is an efficient form of IMRT delivery. It is advantageous over conventional IMRT in terms of treatment delivery time. This study investigates the relation between the number of segments and plan quality in VMAT optimization for a single modulated arc. Five prostate, five lung, and five head-and-neck (HN) patient plans were studied retrospectively. For e...

determining the optimal location of wells with the aid of an automated search algorithm is a significant and difficult step in the reservoir development process. it is a computationally intensive task due to the large number of simulation runs required. therefore,the key issue to such automatic optimization is development of algorithms that can find acceptable solutions with a minimum number of...

This paper presents a Cuckoo Optimization Algorithm (COA) model for the cost optimization of the one-way and two-way reinforced concrete (RC) slabs according to ACI code. The objective function is the total cost of the slabs including the cost of the concrete and that of the reinforcing steel. In this paper, One-way and two-way slabs with various end conditions are formulated as ACI code. The t...

We present the application of dynamic programming to a combinatorial optimization problem to achieve proper arrival runway spacing, which appears in the process of assigning speed during the transition to approach and approach phases of flight. We apply the algorithm to data from a fast-time simulation developed under NASA’s Advanced Air Transportation Technologies Project for investigating new...

This paper presents a synthesis of a volumetric ring antenna array for a terrestrial coverage pattern. This synthesis regards the spacing among the rings on the planes X-Y, the positions of the rings on the plane X-Z, and uniform and concentric excitations. The optimization is carried out by implementing the particle swarm optimization. The synthesis is compared with previous designs by resulti...

Abshrrct: Resistance of VLSI interconnections has become significant due to large die sizes and sub-mkm geometries in high performance designs. Previous studies have proposed optimal repeater schemes wing slmple buffers for delay optimization of the interconnection. This paper proposes a more general approach that handles arbitrary logic gates as well as buffers. The methodology is based on an ...

Due to continuous technology scaling, the interconnect delay and power reduction is becoming one of the most important design challenges. In this paper, we present a novel algorithm for simultaneous multilayer interconnect spacing so that on the one hand the total power of interconnect is reduced and on the other hand, delay constraints are not violated. We first present an optimization problem...

OBJECTIVE The AVOID-FFS (Avoidance of Far-Field R-wave Sensing) study aimed to investigate whether an atrial lead with a very short tip-to-ring spacing without optimization of pacemaker settings shows equally low incidence of far-field R-wave sensing (FFS) when compared to a conventional atrial lead in combination with optimization of the programming. METHODS Patients receiving a dual chamber...