Typically Multi-User Object-Oriented Environments (MOOs) are implemented using a client-server architecture, where a centralized server maintains the MOO state. Such architecture may limit the scalability of the MOO. This paper discusses the role of object migration and replication in the implementation of scalable MOOs.

We describe the outcome and experience of trying to develop an architecture and framework for a Networked Object Oriented Gaming Architecture (NOOGA). The aim of this project was to create an easily extensible framework that facilitates teaching students about object oriented design, design patterns, and software engineering in an interesting context. Our original goal was to develop a game ser...

A client-server architecture to simultaneously solve multiple learning tasks from distributed datasets is described. In such architecture, each client corresponds to an individual learning task and the associated dataset of examples. The goal of the architecture is to perform information fusion from multiple datasets while preserving privacy of individual data. The role of the server is to coll...

The server array is a novel video server architecture based on partitioning each video over multiple server nodes, thereby achieving perfect load balancing for any demand distribution. We discuss the main design issues, compute the buffer requirements at the client, and compare the reliability of different video server architectures.

In this paper, a client/server information system for the management of data and its extraction from a database containing information for diploma works of students is proposed. The developed system provides users the possibility of accessing information about different characteristics of the diploma works, according to their specific interests. The client/server architecture of the system is d...

We present various client-server database architectures in which components of a database system execute on the Web client. The Web components described include a general object browser, cooperative client-server caches, a personal Web assistant and developer tools for database design and prototyping. All of these have been implemented as part of the OMS database development suite. Additionally...

Location-based triggers are the fundamental capability for supporting location-based advertisements, location-based entertainment applications, personal reminders, as well as presence-based information sharing applications. In this chapter, we describe the design and the implementation of mTrigger, an event-based framework for scalable processing of location-based mobile triggers (location trig...

The majority of hospital information system installations in Finland are based on a legacy technology from the U.S. Department of Veterans Affairs (VA). This paper presents an architecture and a tool set which provide a migration path from terminal-based to client/server technology, conserving much of the investments in existing applications. It is argued, though, that a new technological revol...

Distributed Denial of Service (DDoS) attacks exploit the acute imbalance between client and server work loads to cause devastation to the service providers. We pro pose a distributed gateway architecture and a payment protocol that imposes dynamically changing prices on both network, server, and information resources in order to push some cost of initiating service requests — in terms of moneta...