Charles H. Winstead

A numerical model for magnetic chromatography

Abstract In this paper, we present details of a mathematical model for magnetic chromatography (MC) systems where strong distorted magnetic fields are used to separate particles from a colloidal mixture. The model simulates the effect of magnetic field gradients on particle motion, and includes calculation of the fluid flow, magnetic field, and particle concentration field. It is based on the finite-volume method (FVM) and uses an expanding-grid technique to handle domains with large aspect ratios. The model has been validated against the results from an analytical model. The numerical model has been used to simulate the performance of a real MC system under various operating conditions.

Tapeout Execution System (TES), a key enabler of DFM/Co-optimization

Tapeout has evolved from an event marking the end of design to a process where substantial compute resources are used to apply reticle enhancement techniques to product design prior to mask manufacturing. A tapeout execution system (TES) has been developed that provides centralized visibility, controllability and automated execution to the entire tapeout process. TES provides a system for identifying and removing process bottlenecks, quality issues, and compute inefficiencies, resulting in faster tapeout throughput with fewer resources and with higher quality. Furthermore, the TES model provides a framework for data exchange that strengthens the integration between design and manufacturing.