Derivation of Continuum Traffic Model for Weaving Sections on Freeways.

This paper presents a new continuum model describing the dynamics of multiclass traffic flow on multilane freeways including weaving sections. In this paper, we consider a specific freeway weaving type, which is formed when an on ramp is near to an off ramp and these two ramps are joined by an auxiliary lane. Traffic interactions in this weaving zone are very complex due to the involvement of weaving flows and non-weaving flows in the so-called mandatory lane-changing process. To handle this complexity, it is essential to have a good understanding of the (microscopic) driving behavior within the weaving zones. These behaviors are modeled based on a gap-acceptance model. The methodology to obtain a weaving continuum traffic model is thus twofold. On the one hand, we develop a (macroscopic) model to determine the mandatory lane-changing probability based on a renewal process. On the other hand, we implement the lane-changing model into a current gas-kinetic traffic flow model for heterogeneous traffic flow on multilane roadways. From this, corresponding macroscopic model is obtained based on the method of moments

Modeling and Reasoning over Distributed Systems using Aspect-Oriented Graph Grammars

Aspect-orientation is a relatively new paradigm that introduces abstractions to modularize the implementation of system-wide policies. It is based on a composition operation, called aspect weaving, that implicitly modifies a base system by performing related changes within the system modules. Aspect-oriented graph grammars (AOGG) extend the classic graph grammar formalism by defining aspects as sets of rule-based modifications over a base graph grammar. Despite the advantages of aspect-oriented concepts regarding modularity, the implicit nature of the aspect weaving operation may also introduce issues when reasoning about the system behavior. Since in AOGGs aspect weaving is characterized by means of rule-based rewriting, we can overcome these problems by using known analysis techniques from the graph transformation literature to study aspect composition. In this paper, we present a case study of a distributed client-server system with global policies, modeled as an aspect-oriented graph grammar, and discuss how to use the AGG tool to identify potential conflicts in aspect weaving

Geographe Bay Catchment natural resource atlas

The Geographe Bay Catchment Atlas is one of a series of Natural Resource Atlases covering the agricultural region of Western Australia. The purpose of the Atlas is to provide data for people in local communities who manage or have an interest in natural resources. It is now realised that the various components of the land interact with each other and therefore need to be managed together. This Atlas is intended to present natural resource and land information in an accessible way to people of the area. It may act as a focus for catchment planning and provide a starting point to access other, more detailed information. In this way, it is hoped that this Atlas will contribute to long-term sustainability and the conservation of the unique natural resources of the Geographe Bay Catchment. The Geographe Bay Catchment is situated between Bunbury and Dunsborough and covers an area of about 2000 square kilometres. The catchment has a backdrop formed by the Darling Range, Whicher Range and Leeuwin-Naturaliste Ridge, overlooking the southern Swan Coastal Plain, wetlands, watercourses and the Bay. The Carbunup, Capel, Ludlow, Abba, Sabina, Vasse and Buayanuup Rivers drain the Geographe Bay Catchment. Within the Catchment approximately 63 per cent of the land is classed as rural land and about 30 per cent of land classed as Crown Land. The remainder comprises residential land and intensive agriculture (WRC 1977). Four Shires lie partly within the Geographe Bay Catchment. These are: Augusta-Margaret River, Busselton, Capel and Donnybrook-Balinup