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Anomaly detection is essential in network security. It has been researched for decades. Many anomaly detection methods have been proposed. Because of the simplicity of principles, statistical and Markovian methods dominate these approaches. However, their effectiveness is constrained by specific preconditions, which make them work for only appropriate data sets which satisfy their premises. Other...
Debugging distributed system is programmer's nightmare be-cause of non-determinism bugs. Those non-repeatable bugs force developers back to the outdated and time consuming techniques such as printf and log mining for investigation. To relieve this issue, record and replay mechanisms have been proposed. These methods allow developers use their cyclic debug skill in non-deterministic situations. In...
During the past few years Special-purpose data mining systems have drawn great attraction in research and industry area for their application into real environments. In this paper, a new scalable spatial data mining architecture for POI(Points of Interest) datasets has been proposed on VegaGIS 3.0 platform to design and develop a professional spatial data mining system. Our research covers a wide...
It is a critical technique in GIS about how to implement map overlay with high performance. To avoid the disadvantages of computational geometry algorithm approach, an optimal algorithm based on rasterization is proposed in this paper, which adopts approach of rasterization of vector polygons with run length encoded scan line, map overlay on the basis of raster representation and vectorization of...
Creating 3D city from the geographical information is an important goal in the field of visualization for GIS and the needs for Web GIS are growing and expanding rapidly. Many scenes of the 3D cities are built based on the models which are made by computer aided designing software to present real scenes, however, this method costs too much time and labor with the low efficiency. This paper presents...
Optimal path planning is the critical technology for public transit system. In this paper, we propose a new transit path planning model- 3-layers heterogeneous road network model (3-LHRN). Based on this model, we can generate optimal path results, making a good match with real life. Some approaches have been explored in the past to tackle the optimal path planning issues. Taking aim at the least transfers,...
In this paper we introduced a new R-tree node splitting algorithm. As an indexing technique for multi-dimensional data, R-tree is widely used in geographical information systems, CAD systems and spatial databases. An R-tree consists of nodes which in turn consist of records. Each node in R-tree must contain limited number of records in order that it can be stored within one disk block, thus a node...
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