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Highly dynamic distributed applications often require flexible coordination among several autonomous components. Space-based middleware provides a suitable, data-driven coordination paradigm for such scenarios, where distributed peers exchange data and commands in a scalable and decoupled way using shared tuple spaces. In its basic form, such a middleware supports access to a data storage and (blocking)...
Industrial functional safety managers claim that there is no safety (S) without quality (Q) possible. The contribution is to make aware of the importance of standards and the compliance with processes. An overview of relevant functional safety analysis activities is given based on industrial experience in the area of automotive and railway. Even though these methods and software development processes...
Data grids are used in large scale scientific experiments to access and store nontrivial amounts of data by combining the storage resources from multiple data centers in one system. This enables users and automated services to use the storage resources in a common and efficient way. However, as data grids grow it becomes a hard problem for developers and operators to estimate how modifications in...
Fundamental problem in human-robot teams is to find a set of heterogeneous robots that have to cooperate to execute a complex mission. This paper describes the Shared Knowledge Interaction Modelling (SKIM) framework for task allocation and how it is used to: 1) evaluate the performance of finding a set of robots to execute a certain task, and 2) model shared knowledge as a basis for adaptive autonomy...
Distributed applications require coordination of distributed software components in order to achieve a common goal. A coordination model that abstracts the complexity of network communication eases the development of such applications. The objective is to design collaboration with remote hosts in the same way as local interactions. Separation of coordination logic and application code increases maintainability,...
The deployment of cooperative ITS applications is due to start as soon as 2015. Large investments in the roadside unit (RSU) infrastructure will be necessary to create a dense network and accommodate an increasing number of services, leading to a discussion about the trade-off between distributed processing and storage solutions on the RSU nodes and the centralized alternative. A strictly central...
Coordination in distributed embedded systems requires complex synchronization of many concurrent activities. This task becomes especially difficult when network and system failures have to be assumed. The Peer Model is a novel programming model for the design of coordination strategies among multiple nodes, aiming to bridge design and implementation. A major advantage is that designs based on the...
In the last couple of years, cloud computing records a rapidly increasing popularity due to scalable, elastic infrastructures that are charged according to their usage and do not have to be maintained. However, the offerings of cloud providers sometimes drastically differ and therefore, it gets more and more difficult for users to compare clouds and choose a proper provider for a specific service...
Collaborative applications usually involve multiple autonomous processes that have to coordinate themselves over the Internet in an efficient way. For such systems, shared tuple spaces provide a highly flexible coordination medium that enables the asynchronous exchange of messages and data and decouples the participants so that they do not need to know each other. However, if interactions are complex,...
Usability is an important quality attribute for APIs. To create APIs with good usability, appropriate measurement methods are needed. But currently available methods are cost- and time-expensive and the results are not objective and therefore hard to quantify. API design guidelines give a good overview about important usability factors, but lack a scientific basis. When looking at scientific API usability...
While usability has proven to be an important software quality attribute, its application to APIs is still rather uncommon. Available methods for measuring software usability show significant disadvantages when applied to APIs, like the need for test users and experienced evaluators. This makes it difficult to evaluate the usability of software components, as well as to compare different software...
One of the ideas of agile software development is to respond to changes rather than following a plan. Constantly changing businesses result in changing requirements, to be handled in the development process. Therefore, it is essential that the underlying software architecture is capable of managing agile business processes. However, criticism on agile software development states that it lacks paying...
For constantly changing businesses, it is essential that the underlying software architecture is capable of managing agile business processes and meeting future business needs. Decoupling between applications and services in distributed systems is addressed by e. g., service-oriented architectures. On the other hand, applications and its underlying middleware are still tightly coupled with respect...
In the past years, it has been investigated in multiple research projects how shared data spaces can be extended with concepts and technologies from the semantic web area, which led to the development of so-called semantic spaces. These semantic spaces enable clients to publish semantically annotated data at a shared repository and to react to changes of information that can be inferred from this...
Location and manipulation of complex data is a difficult, challenging task in nowadays extremely complex IT systems and on the Internet, overwhelmed with a huge amount of information that develops and grows rapidly. In this paper, we propose a self-organizing approach that combines purely decentralized unstructured P2P with space based computing in order to locate effectively and filter (retrieve)...
The publish/subscribe paradigm is a common concept for delivering events from information producers to consumers in a decoupled manner. Some approaches allow durable subscriptions or the transportation of events even to mobile subscribers in a dynamic network infrastructure. However, in the safety-critical telematics durable delivery of events is not sufficient enough. Short network connectivity time...
Multi-agent systems (MAS) is an accepted paradigm in safety-critical systems, like the production automation. Agents control the underlying machinery they are representing and interact with each other to achieve an optimal production rate. However, the key requirement is to minimize downtime of the production system in order to allow just-in-time delivery and minimal production costs. Nevertheless,...
The effectiveness of Intelligent Transportation Systems (ITS) depends on their ability to collect contextual data from various sources and appropriately generate and transport comprehensible, reliable and timely content to users. In such applications, the exchanged content is structured in space and time. Peer-to-peer(P2P) networks are the natural choice these applications due to their fault-tolerance,...
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