DOI: 10.1007/s10922-009-9131-7
Online Date: 6/16/2009
Print publication date: 9/1/2009
View article on SpringerLink

The Web has become an important knowledge source for resolving system installation problems and for working around software bugs. In particular, web-based bug tracking systems offer large archives of useful troubleshooting advice. However, searching bug tracking systems can be time consuming since generic search engines do not take advantage of the semi-structured knowledge recorded in bug tracking systems. We present work towards a semantics-based bug search system which tries to take advantage of the semi-structured data found in many widely used bug tracking systems. We present a study of bug tracking systems and we describe how to crawl them in order to extract semi-structured data. We describe a unified data model to store bug tracking data. The model has been derived from the analysis of the most popular systems. Finally, we describe how the crawled data can be fed into a semantic search engine to facilitate semantic search.

DOI: 10.1007/s10922-009-9134-4
Online Date: 5/29/2009
Print publication date: 9/1/2009
View article on SpringerLink

Ontology based network management has recently evolved from a theoretical proposal to a more mature technology. As such, it is now being applied in many research projects in a number of different network management and security scenarios. This application has enabled the validation of the main ideas of the proposals and to learn some of the problems that it brings. This paper describes several research projects where ontology based network management proposals were applied, detailing the most important facets of the initial proposals that were used and explaining the main advantages and drawbacks that were found after prototyping these proposals.

DOI: 10.1007/s10922-009-9129-1
Online Date: 5/28/2009
Print publication date: 9/1/2009
View article on SpringerLink

The lack of any methodology for modeling Semantic Web Services means that developers wishing to utilize technologies like the Web Service Modeling Ontology, the Web Service Modeling Language, and the Web Service Execution Environment are lost in a Semantic wilderness with no road signs to guide them on their way. This paper presents an initial guide for developers wishing to model Semantic Web Services, along with a description of the Web Service Modeling Toolkit that provides tool support for the activities that must be conducted by the developer in this process.

DOI: 10.1007/s10922-009-9130-8
Online Date: 5/27/2009
Print publication date: 9/1/2009
View article on SpringerLink

One of the applications of workflow systems is the management of administrative processes characterized by the transmission of information elements among users of an organization. Tasks contained in these processes are carried out by users responsible for confirming, modifying or adding information throughout. These processes need to be defined in workflow management systems in which all the elements are perfectly identified and are easily adaptable to changes that may arise in the sequences of tasks, in the users involved or in the data transmitted from one task to another. For this kind of processes is easier to reuse those represented in ontologies. On one hand, existing ontologies for representing some domain elements can be reused. At the same time, ontologies have an excellent expressive capacity to define tasks, their relationships and the flow control among them with precision. This paper proposes a complete model, together with the necessary software tools, for tackling this issue.

DOI: 10.1007/s10922-009-9132-6
Online Date: 5/27/2009
Print publication date: 9/1/2009
View article on SpringerLink

The purpose of autonomic networking is to manage the business and technical complexity of networked components and systems. However, existing network management data has no link to business concepts. This makes it very difficult to ensure that services offered by the network are meeting business objectives. This paper describes a novel context-aware policy model that uses a combination of modeled and ontological data to determine the current context, which policies are applicable to that context, and what services and resources should be offered to which users and applications.

DOI: 10.1007/s10922-009-9126-4
Online Date: 5/19/2009
Print publication date: 9/1/2009
View article on SpringerLink

Web Services is an XML-based technology that has attracted significant attention for building distributed Internet services. Considerable research efforts have been trying to extend it to become a unifying management technology; initial evaluation efforts have demonstrated promising application potential in the domain of network and service management. This paper analyzes the monitoring requirements of a management system used in architectures for providing quality of service, and shows how Web Services can be used effectively to fulfill these requirements. In order to achieve this, a WS-based framework was designed and a query tool was developed to support distributed, optimized retrieval of management information exposed as Web Services. The query tool supports selective and bulk retrieval from MPLS-capable routers. Management information retrieval is demonstrated through three monitoring scenarios, and the measured performance in terms of latency and bandwidth is compared against a conventional approach based on SNMP.

DOI: 10.1007/s10922-009-9125-5
Online Date: 5/15/2009
Print publication date: 6/1/2009
View article on SpringerLink

This article presents a report on AIMS 2008, which was held July
1–3, 2008 at Jacobs University Bremen in Germany. The theme of the
conference was “Resilient Networks and Services”.

DOI: 10.1007/s10922-008-9113-1
Online Date: 12/3/2008
Print publication date: 12/1/2008
View article on SpringerLink

We address the problem of selecting probe station locations from where probes can be sent to monitor all the nodes in the network. Probe station placement involves instrumentation overhead. Hence, the number of probe stations should be minimal to reduce the deployment cost. Also, probe station placement should be such that the network can be monitored even in the presence of failures. We present algorithms to select locations of probe stations so that the entire network can be monitored for computing various performance metrics. We aim to find a minimal set of probe station nodes so as to minimize the instrumentation overhead. The algorithm presented provides robust monitoring in presence of node failures. We then present algorithms to make the solution resilient to probe station failures, and to deal with weakly connected nodes. We provide an experimental evaluation of the proposed algorithms through simulation results.

DOI: 10.1007/s10922-008-9114-0
Online Date: 11/13/2008
Print publication date: 12/1/2008
View article on SpringerLink

This report summarizes the 2nd International Summer School on Network and Service Management (ISSNSM’08), which was held at the Communication Systems Group (CSG) of the Department of Informatics (IFI), University of Zurich, Switzerland, on 2–6 June 2008. Supported by the European FP6 Network of Excellence for the Management of Internet Technologies and Complex Services (EMANICS), the ISSNSM presented within 5 days eight different topics, covering the areas of (1) security, (2) virtualization and simulations, and (3) network monitoring and management. All of these run for a full or half day, including a short theoretical introduction and larger practical lab course components, respectively.

DOI: 10.1007/s10922-008-9112-2
Online Date: 11/11/2008
Print publication date: 12/1/2008
View article on SpringerLink