Ziegler-Nichols tuned PI and PID controllers are usually found to provide poor performances for high-order and nonlinear systems. In this study, an improved auto-tuning scheme is presented for Ziegler-Nichols tuned PI controllers (ZNPICs). With a view to improving the transient response, the proportional and integral gains of the proposed controller are continuously modified based on the curren...

3 Scale and Performance in a Distributed File System SigOps HoF paper [SOSP’87, TOCS 1988] • John Howard (Project Lead, retired from Sun) • Michael Kazar (CTO Avere, IEEE Info Storage Sys Award) Co-founded Transarc (commercial AFS, acquired by IBM) • Sherri Menees [Nichols] (community activist, Redmond WA) • David Nichols (Microsoft, start-up became Live Meeting) • M. Satyanarayanan (CMU, ACM &...

This contribution demonstrates possibility of delta models for identification and process control of higher order plants by the help of self-tuning delta controllers. Simulation will show behaviour of second order delta controllers used for control of higher order plants. It is used pole placement method and method Ziegler-Nichols for syntheses of controller, comparison is done for different st...

We compute liftings of the Nichols algebra of a Yetter-Drinfeld module of Cartan type B 2 subject to the small restriction that the diagonal elements of the braiding matrix are primitive nth roots of 1 with odd n = 5. As well, we compute the lift-ings of a Nichols algebra of Cartan type A 2 if the diagonal elements of the braiding matrix are cube roots of 1; this case was not completely covered...

What is functionalism? Both Silverstein (1987) and Nichols (1984) have analyzed in detail the variety of ways functionalism has been used by linguists. Silverstein made a division into four types of functions, referential and pragmatic: (a) `sense-structure', (b) the `abstract, "sentence"-internal distribution of forms,' (c) the `use of signal forms for purposive, intentional social effect' (d)...

We give a model of the K-ring of the flag varieties in terms of a certain braided Hopf algebra called the Nichols-Woronowicz algebra. Our model is based on the construction of the path operators by C. Lenart and A. Postnikov.

INTRODUCTION The objective in supply chain management is to manage all activities associated with the flow of products and services from the beginning of the manufacturing or processing cycle through to the end-user [Handfield and Nichols, 1999]. The challenge is to manage this process in such a way as to establish collaborative alliances with strategic suppliers [Dyer, Co, Chu, 1998] and to ex...