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The main aim of this study was to find out to what extent the concentration of cationic n-dodecylamine nitrate DAN and/or anionic sodium n-dodecyl sulphate SDS surfactants influence the ratio between hexagonal H and cubic C type of negative colloid AgI particles prepared by dilution of AgI complex in NaI solution by pouring into DAN and/or SDS solutions of different concentrations. Using x-ray diffraction...
Modern consumer and embedded electronics are becoming more complex and intelligent systems each day and their implementation puts a great challenge in front of the designers. Special functions call for specific hardware solutions that are not common in a commercially available platforms. This paper presents tha gained experience and lessons learned from number of projects realized as cooperation between...
Currently, increasingly large number of Geospatial Web Services are being built in Spatial Data Infrastructures (SDIs). Although services make it easy for users to access desired information, the quality of Geospatial Web Services will greatly affect the willingness of users in access of these services. Therefore, in order to improve the use of service-oriented architecture for distributed geospatial...
Most national spatial data infrastructures (SDI) were built based on a clearinghouse concept. The concept requires all of the service providers to maintain a Web (map) service recourse which leads to duplication of efforts from data collectors. The objectives of developing a geo service broker are to make data services and other services within an SDI centrally organized, available and accessible...
In this paper, we show a graph isomorphism between a dual graph of the Delaunay graph of the sampled points and the medial axis of the sampled features. This dual graph captures the fact that two Delaunay triangles share two vertices or an edge. Then, we apply it to the computation of the medial axis of the features selected in an image. The computation of the medial axis of images is of interest...
In this paper, we show an isomorphism between the set of complex operations on the kinetic Voronoi diagram of points and open oriented line segments and the sets of numbers of new / deleted Voronoi regions induced by these operations, and its explanation using the finite field of residual classes of integers modulo 5: F5 = Z/5Z. We show also an isomorphism between the set of complex operations on...
In geographic information systems the reversibility of map update operations have not been explored yet. In this paper we are using the Voronoi based quad-edge data structure to define reversible map update operations. The reversibility of the map operations have been formalised at the lowest level, as the basic algorithms for addition, deletion and moving of spatial objects. Having developed reversible...
Under flood events, the ground traffic is blocked in and around the flooded area due to damages to roads and bridges. The traditional transportation network may not always help people to make a right decision for evacuation. In order to provide dynamic road information needed for flood rescue, we developed an adaptive web-based transportation network application using Oracle technology. Moreover,...
In this paper the development of Web GIS based decision support system for flood events is presented. To improve flood prediction we developed the decision support system for flood prediction and monitoring that integrates hydrological modelling and CARIS GIS. We present the methodology for data integration, floodplain delineation, and online map interfaces. Our Web-based GIS model can dynamically...
Proximity queries among circles could be effectively answered if the Delaunay graph for sets of circles could be computed in an efficient and exact way. In this paper, we first show a necessary and sufficient condition of connectivity of the Voronoi diagram of circles. Then, we show how the Delaunay graph of circles (the dual graph of the Voronoi diagram of circles) can be computed exactly, and in...
In this paper we are using local and sequential map updates in the Voronoi data structure, which allows us to automatically record each event and performed map updates within the system. These map updates are executed through map construction commands that are composed of atomic actions (geometric algorithms for addition, deletion, and motion of spatial objects) on the dynamic Voronoi data structure...
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