Interworking Methodologies for DCOM and CORBA.

The DCOM and CORBA standards provide location-transparent access to network-resident software through language independent object interfaces. Although the two standards address similar problems, they do so in incompatible ways: DCOM clients cannot use CORBA objects, and CORBA clients cannot utilize DCOM objects, due to incompatible object system infrastructures. This thesis investigates the performance of bridging tools to resolve the incompatibilities between DCOM and CORBA, in ways that allow clients to cross object system boundaries. Two kinds of tools were constructed and studied: tools that bind clients to services at compile time, and tools that support dynamic client-server bindings. Data developed in the thesis shows that static bridges are on the order of five times faster than dynamic bridges. Measurements conducted with remote clients also showed that with increased network delays, performance differences between static and dynamic bridges become negligible

Preferential attachment of communities: the same principle, but a higher level

The graph of communities is a network emerging above the level of individual nodes in the hierarchical organisation of a complex system. In this graph the nodes correspond to communities (highly interconnected subgraphs, also called modules or clusters), and the links refer to members shared by two communities. Our analysis indicates that the development of this modular structure is driven by preferential attachment, in complete analogy with the growth of the underlying network of nodes. We study how the links between communities are born in a growing co-authorship network, and introduce a simple model for the dynamics of overlapping communities.Comment: 7 pages, 3 figure

Uncovering the overlapping community structure of complex networks in nature and society

Many complex systems in nature and society can be described in terms of networks capturing the intricate web of connections among the units they are made of. A key question is how to interpret the global organization of such networks as the coexistence of their structural subunits (communities) associated with more highly interconnected parts. Identifying these a priori unknown building blocks (such as functionally related proteins, industrial sectors and groups of people) is crucial to the understanding of the structural and functional properties of networks. The existing deterministic methods used for large networks find separated communities, whereas most of the actual networks are made of highly overlapping cohesive groups of nodes. Here we introduce an approach to analysing the main statistical features of the interwoven sets of overlapping communities that makes a step towards uncovering the modular structure of complex systems. After defining a set of new characteristic quantities for the statistics of communities, we apply an efficient technique for exploring overlapping communities on a large scale. We find that overlaps are significant, and the distributions we introduce reveal universal features of networks. Our studies of collaboration, word-association and protein interaction graphs show that the web of communities has non-trivial correlations and specific scaling properties.Comment: The free academic research software, CFinder, used for the publication is available at the website of the publication: http://angel.elte.hu/clusterin

Dcom, Corba, Java Rmi: Konsep Dan Teknik Dasar Pemrograman

DCOM, CORBA, dan Java RMI adalah middleware yang memungkinkan komputasi jarak jauh atau komputasi tersebar. Meskipun telah terdapat konsep layanan web dan implementasi yang diterapkan dalam berbagai kasus saat ini, ketiga middleware di atas masih sering digunakan untuk lingkungan yang application-specific, yang membutuhkan performa lebih baik. Paper ini diharapkan akan memberikan gambaran mengenai DCOM, CORBA, dan Java RMI dari konsep hingga perbedaan yang paling mendasar terkait teknik pemrograman. DCOM, CORBA, and Java RMI are middleware that enable remote computing (distributed computing). Although we have Web Service concept and implementation that applied in many cases right now, all three still often used for applications-specific nature, which need the better performance. This paper is intended to give an overview of DCOM, CORBA, and Java RMI, from concept to most fundamental differences related to programming techniques

Interoperability of Information Systems and Heterogenous Databases Using XML

Interoperabilily of information systerrrs is the most critical issue facing businesse! that need to access information from multiple idormution systems on tlifferent environments ancl diverse platforms. Interoperability has been a basic requirement for the modern information systems in a competitive and volatile business environment, particularly with the advent of distributed network system and the growing relevance of inter-network communications. Our objective in tltis paper is to develop a comprehensiveframework tofacilitate interoperability smong distributed and heterogeneous information systems and to develop prototype software to validate tlte application of XML in interoperability of infurmation systems and databases

DCOM, CORBA, JAVA RMI: KONSEP DAN TEKNIK DASAR PEMROGRAMAN

DCOM, CORBA, dan Java RMI adalah middleware yang memungkinkan komputasi jarak jauh atau komputasi tersebar. Meskipun telah terdapat konsep layanan web dan implementasi yang diterapkan dalam berbagai kasus saat ini, ketiga middleware di atas masih sering digunakan untuk lingkungan yang application-specific, yang membutuhkan performa lebih baik. Paper ini diharapkan akan memberikan gambaran mengenai DCOM, CORBA, dan Java RMI dari konsep hingga perbedaan yang paling mendasar terkait teknik pemrograman. DCOM, CORBA, and Java RMI are middleware that enable remote computing (distributed computing). Although we have Web Service concept and implementation that applied in many cases right now, all three still often used for applications-specific nature, which need the better performance. This paper is intended to give an overview of DCOM, CORBA, and Java RMI, from concept to most fundamental differences related to programming techniques