Complexity Analysis of Molecular Specification and Processing of Scene Animations

A scene animation involving a limited environmental boundary, obstacles, other static and dynamic objects, and scene events is more interdependent, variable, and personal than a single object's animation. Traditional path specification does not directly address the special issues in this problem domain, and its use can be very costly and time consuming. In addition to this approach, three other models are proposed for scene animations. These are the sensor-effector model, the rule-based model, and the predefined environment model. These models, however, are either incomplete or limited to certain behaviours or simple environments. This paper analyses the complexities of modular specification and processing in a general scene context, based on the concept of relations, its modelling framework, and state control hierarchies. These estimated complexities outline the general specification and system processing interfaces that can be used effectively in various scene applications.     

A survey of interactive mesh‐cutting techniques and a new method for implementing generalized interactive mesh cutting using virtual tools‡

In our experience, mesh‐cutting methods can be distinguished by how their solutions address the following major issues: definition of the cut path, primitive removal and re‐meshing, number of new primitives created, when re‐meshing is performed, and representation of the cutting tool. Many researches have developed schemes for interactive mesh cutting with the goals of reducing the number of new primitives created, creating new primitives with good aspect ratios, avoiding a disconnected mesh structure between primitives in the cut path, and representing the path traversed by the tool as accurately as possible. The goal of this paper is to explain how, by using a very simple framework, one can build a generalized cutting scheme. This method allows for any arbitrary cut to be made within a virtual object, and can simulate cutting surface, layered surface or tetrahedral objects using a virtual scalpel, scissors, or loop cautery tool. This method has been implemented in a real‐time, haptic‐rate surgical simulation system allowing arbitrary cuts to be made on high‐resolution patient‐specific models. Published in 2002 by John Wiley & Sons, Ltd.     

New Patterns in Urban Design

Brian McGrath and VictoriaMarshall discern the newly resilient urban patterns that are emerging in the meta-city, shifting and adjusting to changing local and global conditions. Based on smart infrastructure, self-sufficiency and hybrid local models, highly adaptive design patterns take the form of responsive micropatches rather than overarching masterplans. As demonstrated by the featured projects, ‘pattern recognition’, sensory mapping techniques and sensitivity to a city's ecosystem are becoming essential tools to the urban designer. Copyright © 2009 John Wiley & Sons, Ltd.     

基于空间正义理论的中国自然保护地空间布局研究

优化空间布局是中国自然保护地体系建设的目标之一,也是自然保护地可持续发展的必要举措.作为后现代地理学有力的空间批判工具,空间正义理论为寻求关涉多重主体的自然保护地空间优化提供重要依据.遵循空间-正义辩证法思想,建立中国自然保护地布局的批判性分析框架,从正义的空间性和空间的正义性2个维度观察、辨别并力图消减自然保护地空间...