20,286 research outputs found
Properties of concrete containing coal bottom ash and fine coconut shell as partial sand replacement
The consumption of natural sand in concrete production is very high around the worldwide and it caused the shortage of natural fine aggregate which is suitable for construction in many countries [1]. This problem gives the chance for reuse by-products materials as a source of fine aggregate by partial or full replacement in construction activities. Hence, it can reduce the demand for extraction of natural raw materials and save landfill space other than reduce the consumption of natural resources [1]. Moreover, all over the world aimed at increasing the reuse and recycling suitable material for effective replacement of cement and fine aggregate in construction sector due to lack of natural resources.
Interval type-2 fuzzy automata and Interval type-2 fuzzy grammar
The purpose of the present work is to introduce and study the concept of interval
type-2 (IT2) fuzzy grammar which recognizes the given IT2 fuzzy languages. The
relationship between IT2 fuzzy automata and IT2 fuzzy (weak) regular grammars is
discussed. Specifically, the results we obtained here are (i ) IT2 fuzzy weak regular
grammar and IT2 fuzzy regular grammar generate the same classes of IT2 fuzzy
languages (ii ) for a given IT2 fuzzy regular grammars, there exists an IT2 fuzzy
automata such that they accept the same IT2 fuzzy languages, and vice versa. In
addition, we define some operations on IT2 fuzzy languages and it is shown that IT2
fuzzy languages recognized by IT2 fuzzy automata are closed under the operations
of union, intersection, concatenation and Kleene closure, but are not closed under
complement
Development of an intelligent hypertext manual for the space shuttle hazardous gas detection system
A computer-based Integrated Knowledge System (IKS), the Intelligent Hypertext Manual (IHM), is being developed for the Space Shuttle Hazardous Gas Detection System (HGDS) at the Huntsville Operations Support Center (HOSC). The IHM stores all HGDS related knowledge and presents them in an interactive and intuitive manner. The IHM's purpose is to provide HGDS personnel with the capabilities of: enhancing the interpretation of real time data; recognizing and identifying possible faults in the Space Shuttle sub-system related to hazardous gas detections; locating applicable documentation related to procedures, constraints, and previous fault histories; and assisting in the training of personnel
All about that - a URI profiling tool for monitoring and preserving linked data
All About That (AAT) is a URI Profiling tool which allows users to monitor and preserve Linked Data in which they are interested. Its design is based upon the principle of adapting ideas from hypermedia link integrity in order to apply them to the Semantic Web. As the Linked Data Web expands it will become increasingly important to maintain links such that the data remains useful and therefore this tool is presented as a step towards providing this maintenance capability
User-centred design of flexible hypermedia for a mobile guide: Reflections on the hyperaudio experience
A user-centred design approach involves end-users from the very beginning. Considering users at the early stages compels designers to think in terms of utility and usability and helps develop the system on what is actually needed. This paper discusses the case of HyperAudio, a context-sensitive adaptive and mobile guide to museums developed in the late 90s. User requirements were collected via a survey to understand visitorsâ profiles and visit styles in Natural Science museums. The knowledge acquired supported the specification of system requirements, helping defining user model, data structure and adaptive behaviour of the system. User requirements guided the design decisions on what could be implemented by using simple adaptable triggers and what instead needed more sophisticated adaptive techniques, a fundamental choice when all the computation must be done on a PDA. Graphical and interactive environments for developing and testing complex adaptive systems are discussed as a further
step towards an iterative design that considers the user interaction a central point. The paper discusses
how such an environment allows designers and developers to experiment with different systemâs behaviours and to widely test it under realistic conditions by simulation of the actual context evolving over time. The understanding gained in HyperAudio is then considered in the perspective of the
developments that followed that first experience: our findings seem still valid despite the passed time
Hunter gatherer: within-web-page collection making
Hunter Gatherer is a tool that lets Web users carry out three main tasks: (1) collect components from within Web pages; (2) represent those components in a collection; and (3) edit those collections. We report on the design and evaluation of the tool and contextualize tool use in terms of our research goals to investigate possible shifts in information interaction practices resulting from tool use
ELF: The electronic learning facilitator
As the worldâwide computer network becomes ubiquitous, new tools have been developed, such as the World Wide Web (WWW), for the delivery of multimedia hypertextâbased documents. Similarly, there has been an explosion in the amount of email, bulletin boards, and Usenet News available. This has led to a major problem of information overload: we are slowly but surely being overwhelmed by the amount of information available to us
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