ly, we can think of a garbage collector as a thread or threads running perhaps concurrently with the actual compute thread(s). This is shown in Figure 3. We refer to the threads doing real computations as the mutator, since they are changing the object graph that the garbage collector is trying to manage. 3 Reference counting A standard (and often incorrectly implemented) approach to automatic ...

A fixed base digital stereo-vision system is a powerful tool for positioning objects in 3-dimensions without control in object space. It can be integrated in a vehicle together with GPS and inertial systems to collect spatial information while driving at highway speeds. In this paper we discuss the integrated calibration of the stereo-vision system using a simultaneous, constrained adjustment o...

Object Orientation (OO) was the big hype of the late 1980. Everyone and everything should be object oriented. Databases, programming languages and software development projects were some of the most visible examples. Today OO has joined the more established paradigms in computer science. Object Oriented programming languages are used in a ever increasing share of the software development. Much ...

The Digital Object Identifier (DOI) System is a managed system for persistent identification of content on digital networks. It can be used to identify physical, digital, or abstract entities. The identifiers (DOI names) resolve to data specified by the registrant, and use an extensible metadata model to associate descriptive and other elements of data with the DOI name. The DOI system is imple...

We propose and test a focus plane determination method that computes the digital refocus distance of an object investigated by digital holographic microscopy working in transmission. For this purpose we analyze the integrated amplitude modulus as a function of the digital holographic reconstruction distance. It is shown that when the focus distance is reached, the integrated amplitude is minimu...

In this paper, we present an argument for designing metadata schemata with design patterns. Design patterns are structured descriptions of solutions to some class of problems, and are used extensively in various stages of object-oriented software engineering. We present a use case of collaborative construction of metadata for a digital library. We explore design challenges this scenario present...

Information and reference services are one major component of library services. This article attempts to describe the paradigm of information and reference services in the digital library. Based on the fact that automatic digital library technologies are solving more and more information needs and changing the mode of user service, the authors suggest a three-levelled system that supports users...

RFID can give a unique digital identifier to real physical object, and bridges the physical world with the virtual digital world. Based on the analysis on our experience of RFID applications, some common key issues and requirements of RFID application are presented. A lightweight framework based on Web Service to support ubiquitous RFID application of medicine logistics is designed and implemen...