This paper describes the object-oriented design and implementation of a family of stream-oriented le systems under UNIX and under an object-oriented operating system called Choices. A class hierarchy provides an object-oriented taxonomy of the algorithms and data structures used in the design of this family. The family includes the System V le system, the 4.2 BSD le system, and the MS-DOS le sy...

We present a hierarchical system for object recognition that models neural mechanisms of visual processing identified in the mammalian ventral stream. The system is composed of neural units organized in a hierarchy of layers with increasing complexity. A key feature of the system is that the neural units learn their preferred patterns from visual input alone. Through this “soft wiring” of neura...

Many of today s object models represent parallelism and distribution inadequately because these models grew out of sequential object oriented languages In this paper we develop a model that is directly derived from an abstract but very simple and compact de nition of the object oriented paradigm It is shown how inter object and intra object concurrency arise naturally from this paradigm The dec...

The data dependence analysis is a hard problem, particularly in the presence of data structures similar to the pointer: The inheritance and the polymorphism in the object-oriented language provide the program designing and the software engineering with new methods. But at the same time, they bring about more barriers in the dependence analysis for object-oriented language. This paper proposes a...

Traditionally, tracking systems require dedicated hardware to handle the computational demands and input/output rates imposed by real-time video sources. An alternative presented in this paper uses configurable computing machines, which use interconnected FPGAs to provide fine-grain parallelism and reconfigurability so that high-speed performance is possible for many different applications. The...

This paper describes a custom computing approach to real-time visual tracking. Traditionally, tracking systems require dedicated hardware to accommodate the computational demands and input/output rates imposed by real-time video sources. A radical alternative is represented by custom computing machines such as Splash 2, which use interconnected Field-Programmable Gate Arrays (FPGAs) to provide ...

An object recognition system is presented that it designed to handle the computational complexity posed by a large model base, an unconstrained viewpoint and the structural complexity and detail inherent in a single view. The design is based on two ideas. The first is to compute descriptions of what the objects should look like in the image, called predictions, before the recognition task begin...

A demand-driven parallelization of the ray tracing algorithm is presented. Correctness and optimality of a perfect load balancing algorithm for image space subdivision are proved and its exact message complexity is given. An integration of antialiasing into the load balancing algorithm is proposed. A distributed object database allows rendering of complex scenes which cannot be stored in the me...

Object-oriented programs evolve by means other than just the addition of new classes. The changes to object-oriented programs that have been most studied are those based on inheritance, on reorganizing a class hierarchy. However, aggrega-tion is a relationship between classes that is just as important as inheritance, and many changes to an object-oriented design involve the aggregate/component ...

This paper describes our experiences in porting a distributed object oriented real-time operating system called Apertos1 to a new RISC platform, and some enhancements made to improve its performance. Apertos employs an objectmetaobject hierarchy to facilitate object heterogeneity. This meta-hierarchy is intended to support various objects with different requirements such as real-time constraint...