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This paper presents an extended mobile lattice gas model allowing pedestrian's variable step size and reveals the effects of various walking step size on pedestrian evacuation. The possible sizes are scanned before determining the moving directions and the impacts of the step size on pedestrian's path selection are considered. The evacuation process of pedestrians from a room with an exit is simulated...
Four types of novel C 1 -symmetric chiral crown ethers including 28-crown-8, 20-crown-6, 17-crown-5 and 14-crown-3 (9a–m) were synthesized and their enantiodiscriminating abilities with protonated primary amines (10–14) were examined by 1 H NMR spectroscopy. 20-crown-6 crown ethers exhibited good chiral recognition properties toward these guests and showed different complementarity...
IaaS is one of the basic service models in cloud computing, and virtual machine deployment is an important task in IaaS. In this paper, we study the problem of data transfer cost between VMs and data centers in cloud computing environment with multi clusters. We propose a measurement model which defines the traffic matrix and unit price matrix, while the optimization target is the total cost of data...
High-performance processor architectures are moving toward the integration of more processing cores on a single chip. PCs and parallel computer systems will have higher computing performance. It is very meaningful for power system simulation, online stability assessment and control. But traditional serial and parallel software can not fully exploit multi-core's capability without parallelizing restructure...
A radial basis function neural network (RBFNN) is developed and applied to analyze one-dimension periodic defected ground structure (1-D DGS). This RBFNN is designed by Matlab program and used to the modeling and simulation of 1-D DGS circuits. The trained artificial neural network (ANN) model maps a set of scatting parameters of 1-D DGS in terms of its geometric parameters. A good agreement among...
Analyzing the growth rhythm of a plant correctly is very important during modeling its whole growth process. Now the parametric L-system is a kind of popular plant modeling tool in which many parameters are introduced to build up the production rules. To depict growth details of a plant the growth function is combined with the L-system production rules in which the interaction among several plant...
Keyword search over relational databases (KSORD) enables casual users to use keyword queries (a set of keywords) to search relational databases just like searching the Web, without any knowledge of the database schema or any need of writing SQL queries. In KSORD, retrieval of user's initial query is often unsatisfying. User has to reformulate his query and execute the new query, which costs much time...
Based on virtual reality technology, the paper does some researches and developments for virtual grinding system. A friendly human-computer interaction interface and virtual machining environment are programmed with Visual C++ and OpenGL, and their characters of interaction and immersion are embodied completely. Physical model of virtual grinding wheel and mathematical model of contact between abrasive...
We structured simulation model of logistics safety storage by using system dynamic (SD), made computer trends simulation. Based on the result, we tentatively calculated logistic safety storage.
Based on LS-DYNA software, metal cutting processes are dynamically simulated by using 2D r-adaptive method. The mechanisms of plastic deformation and chip formation in metal cutting are analyzed. The influences of tool rake angle and friction factor on cutting deformation are analyzed and deformation extent is measured by plastic deformation energy. According to the distribution of stress and strain...
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