Abstract
This paper reports a technical assessment of an all-optical 4×10 Gbps clock extraction technique in the context of fiber optic digital communication systems. The technique consists in putting a 1320 nm semiconductor laser in a self pulsating mode through injection locking to a CW source. The pulsations are triggered by a fast drive current step. The useful self pulsation region has been explored after extensive simulation providing a valuable knowledge for on-going experiments. Actual synchronization with optical data stream was observed both considering all ones and pseudo-random sequences. Phase sustaining of the clock over moderate-length sequences of zeros was noticed as the most encouraging result of this work.

Abstract
This paper addresses the design of a hybrid feedback control system enabling a car-like, rectangular vehicle to perform a tight L-shaped turn maneuver, This case constitutes an effort towards the definition of a general purpose methodology for hybrid feedback control synthesis. The design effort encompasses the synthesis of a set of modalities and mechanisms to detect relevant events enabling the overall motion coordination so that a global goal is attempted, Simulations of the implemented controller have shown a strong robustness with respect lo modeling uncertainty and execution errors.

Abstract
This paper describes the components and functionalities of a Modelling Workbench (MW) to be used within the context of the so-called Purdue Enterprise Reference Architecture (PERA) methodology. The different life-cycle phases of an enterprise integration project and the model building blocks provided are presented and described. A short description of the proposed prestandard ENV 40 003 basic reference model, which provides the context for the so-called executable models, is first presented. This is followed by an explanation of the use of the MW within the context of the Purdue Enterprise Reference Architecture life-cycle support. While most of the issues discussed in this paper are confined to the shop floor environment and related applications, the general underlying concepts are relevant to manufacturing systems in general.

Abstract
We report what is to our knowledge the first laser operation of Nd3+-doped LiNbO3 near 900 nm. An absorbed power threshold of 26 mW was obtained when the device was pumped at 814 nm. The design of the waveguide geometry to favor laser operation at this wavelength is demonstrated. (C) 1997 Optical Society of America.

Abstract
This paper addresses the design of a hybrid feedback control system enabling a car-like, rectangular vehicle to perform a tight L-shaped turn maneuver. This case constitutes an effort towards the definition of a general purpose methodology for hybrid feedback control synthesis. The design effort encompasses the synthesis of a set of modalities and mechanisms to detect relevant events enabling the overall motion coordination so that a global goal is attempted. Simulations of the implemented controller have shown a strong robustness with respect to modeling uncertainty and execution errors.

Abstract