Genetic Adaptive Control for PZT Actuators

A piezoelectric transducer (PZT) is capable of providing linear motion if controlled correctly and could provide a replacement for traditional heavy and large servo systems using motors. This paper focuses on a genetic model reference adaptive control technique (GMRAC) for a PZT which is moving a mirror where the goal is to keep the mirror velocity constant. Genetic Algorithms (GAs) are an integral part of the GMRAC technique acting as the search engine for an optimal PID controller. Two methods are suggested to control the actuator in this research. The first one is to change the PID parameters and the other is to add an additional reference input in the system. The simulation results of these two methods are compared. Simulated Annealing (SA) is also used to solve the problem. Simulation results of GAs and SA are compared after simulation. GAs show the best result according to the simulation results. The entire model is designed using the Mathworks' Simulink tool

SyD: A Middleware Testbed for Collaborative Applications over Small Heterogeneous Devices and Data Stores

Abstract. Currently, it is possible to develop a collaborative application running on a collection of heterogeneous, possibly mobile, devices, each potentially hosting data stores, using existing middleware technologies such as JXTA, BREW, compact.NET and J2ME. However, they require too many ad-hoc techniques as well as cumbersome and time-consuming programming. Our System on Mobile Devices (SyD) middleware, on the other hand, has a modular architecture that makes such application de-velopment very systematic and streamlined. The architecture supports transactions over mobile data stores, with a range of remote group invo-cation options and embedded interdependencies among such data store objects. The architecture further provides a persistent uniform object view, group transaction with Quality of Service (QoS) speci¯cations, and XML vocabulary for inter-device communication. This paper presents the basic SyD concepts, introduces the architecture and the design of the SyD middleware and its components. We also provide guidelines fo

Transport Layer Optimizations for Heterogeneous Wireless Multimedia Networks Approved by:

To my family. iii ACKNOWLEDGEMENTS I would like to thank my advisor Dr. Madisetti, for his assistance, continuing support, and encouragement throughout my years in the Ph.D. program. I would also like to thank Dr. Sivakumar, and Dr. Altunbasak, for serving in my reading committee and for their suggestions during the preparation of this thesis

Internet of things: A hands-on approach

s.l.433 p.: bibl., index; 25 c

A Soft-Handoff Transport Protocol for Media Flows In Heterogeneous . . .

In this paper we introduce a protocol for end-to-end handoff management in heterogeneous wireless IP-based networks. The protocol is based on the stream control transmission protocol (SCTP), and employs a soft-handoff mechanism that uses end-to-end semantics for signaling handoffs and for transmitting control messages. The objective of this protocol is first to reduce the home registration delay, and second, to eliminate the tunneling cost that exist in the current IP-based handoff management protocols. While the multihoming feature of SCTP has been suggested as way to realize soft-handoffs, our study is the first one the presents the relative merits of this handoff approach through an analytical methodology. After our theoretical analysis, we evaluate the performance the soft-handoff mobile-SCTP protocol, when media flows with stringent QoS requirements are employed. Our objective is to evaluate whether the soft-handoff mechanism employed by the protocol, can efficiently support media flows in terms of jitter and throughput. We present simulation results that show performance improvements for several vertical handoff scenarios in current and emerging mobile networks