The procedural steps for developing an expert system for designing signals at isolated intersections are described and the most important development issues for each step are discussed. The steps include problem analysis and definition, preliminary prototype specification, knowledge acquisition strategy development, prototype development plan, knowledge extraction, knowledge representation, too...

The shortage of human resources on the International Space Station (ISS) is becoming a serious problem. In our previous work, a new space robot system, the ”IntraVehicular Free-Flyer System” (IVFFS) was proposed. The IVFFS supports both non-contact and contact tasks during intra-vehicular activities (IVA). To achieve this goal, we introduced a prototype model called ”Space Humming Bird (SHB)” w...

Time intervals are conventionally represented as linear segments in a one-dimensional space. An alternative representation of time intervals is the triangular model (TM), which represents time intervals as points in a two-dimensional space. In this paper, the use of TM in visualising and analysing time intervals is investigated. Not only does this model offer a compact visualisation of the dist...

Applications of multi-class classification, such as document categorization, often appear in cost-sensitive settings. Recent work has significantly improved the state of the art by moving beyond “flat” classification through incorporation of class hierarchies [4]. We present a novel algorithm that goes beyond hierarchical classification and estimates the latent semantic space that underlies the...

The current computing and communication services provide convenience and functionality. The creation of these services is however not an easy task. Service development is still mainly technical oriented, where service creation tools are meant for serving and assisting the professional developers. In other words, service creation is not seen as a task for end-users. In our research, we wish to e...

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In this report we describe our scalability-related experiments with the transactional R-Tree prototype on a server-class hardware. We describe here our algorithm for concurrency control and transactional isolation, the prototype and the evaluation environment. Also the motivation and a short R-Tree technology survey is presented. This report can be considered as the supplementary to the paper [...

A wireless network using high altitude platforms located in the stratosphere is attracting interests as a new network infrastructure. This paper provides the design concept and basic performance of the prototype of onboard digital beamforming (DBF) antenna in Ka band, which achieves quick-response and robust space division multiple access (SDMA) schemes. The configuration of the prototype DBF a...