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The present paper introduces the concept of adaptive automata as an alternative formal tool for describing context-dependent languages. This formal framework has the advantage of allowing easy mapping of a language description into an efficient parser for that language. Such a good performance is due to the potential hierarchical structure adaptive automata… (More)

A formal device is said to be adaptive whenever its behavior changes dynamically, in a direct response to its input stimuli, without interference of external agents, even its users. In order to achieve this feature, adaptive devices have to be self-modifiable. In other words, any possible changes in the device's behavior must be known at their full extent… (More)

This paper presents an overview of current work on the recognition of sign language and a prototype of a simple editor for a small subset of the Brazilian Sign Language, LIBRAS. Handshape based alphabetical signs, are captured by a single digital camera, processed on-line by using computational vision techniques and converted to the corresponding Latin… (More)

— Currently there are three basic types of pattern recognition, the syntactic, the statistical and the neu-ral types. They all have advantages and disadvantages, some of which are troublesome. In statistical methods it is difficult to express structured information. Neural methods have problems to represent neural networks semantically. In syntactic methods… (More)

This article presents adaptive automata as an alternative theoretical model to formally describe recognizing devices with learning capabilities. A simplified formal definition of the notation and its semantics is given, and some analysis is made on their time and space behavioral properties, showing positive aspects that make them suitable for knowledge… (More)

This paper introduces a new algorithm for the induction of decision trees, based on adaptive techniques. One of the main feature of this algorithm is the application of automata theory to formalize the problem of decision tree induction and the use of a hybrid approach, which integrates both syntactical and statistical strategies. Some experimental results… (More)

Adaptive technologies are based on the self-modifying property of some systems, which give their users a very powerful and convenient facility for expressing and handling complex problems. In order to accomplish self-modification, systems must be instructed on what exactly to modify, the correct place such an alteration is expected to occur and when… (More)

- João José Neto, César Bravo Pariente, Fabrizio Leonardi
- 1999

The aim of the present paper is to revisit some important topics regarding pedagogical issues on the teaching of concepts and t echniques of programming languages and compiler construction. Essentially, a unified formal model is used in the proposed approach to explore the exposition of the students to a set of lessons with growing complexity, with a heavy… (More)

- JOÃO JOSÉ NETO, JORGE RADY DE ALMEIDA, SYNCHRONISED STATECHARTS
- 1998

When modelling reactive systems, one has to adequately choose tools and notations that are consistent and appropriate to comfortably express all relevant features of a system. There are many ways and notations to describe the structure and behavior of systems. Graphical notations are uaually attracting for being intuitive and readable. Statecharts and Petri… (More)

This paper impose further discipline to the use of adaptive automata [Jos94], [Iwa00] by restricting some of their features, in order to obtain devices that are easier to create and more readable, without loosing computational power. An improved notation is proposed as a first try towards a language for adaptive paradigm programming.