Crowd simulation has been becoming an efficient tool to study the crowd behavior and its movement. Macroscopic and microscopic approaches take a trade-off between efficiency and accuracy, but neither of them achieves ...
详细信息
Crowd simulation has been becoming an efficient tool to study the crowd behavior and its movement. Macroscopic and microscopic approaches take a trade-off between efficiency and accuracy, but neither of them achieves the two goals at the same time. Aiming to achieve both efficiency and accuracy, a multi-resolution model is proposed in this paper for crowd simulation. The paper illustrates how macroscopic and microscopic models co-exist in a single simulator and the interactions between them. The simulation result of a case study shows that the proposed multi-resolution simulation model can obtain a more accurate result than that using a simple macroscopic model alone. The simulation performance is also improved in the meantime.
We develop several deep learning algorithms for approximating families of parametric PDE solutions. The proposed algorithms approximate solutions together with their gradients, which in the context of mathematical fin...
详细信息
Dynamic load sharing policies take system state into account in making load distribution decisions. The state information can be maintained in one of two basic ways: distributed or centralized. Two principal types of ...
Silicon and germanium single crystals are implanted with protons. The infrared-absorption spectra of the samples contain sharp absorption lines due to the excitation of hydrogen-related local vibrational modes. The li...
Silicon and germanium single crystals are implanted with protons. The infrared-absorption spectra of the samples contain sharp absorption lines due to the excitation of hydrogen-related local vibrational modes. The lines at 743.1, 748.0, 1986.5, and 1989.4cm−1 in silicon and at 700.3, 705.5, 1881.8, and 1883.5cm−1 in germanium originate from the same defect in the two materials. Measurements on samples coimplanted with protons and deuterons show that the defect contains two equivalent hydrogen atoms. Uniaxial stress measurements are carried out and a detailed analysis of the results is presented. It is shown that the defect has monoclinic-II symmetry, and the orientations of the Si-H and Ge-H bonds of the defect are determined. Ab initio local-density-functional theory is used to calculate the structure and local vibrational modes of the self-interstitial binding one and two hydrogen atoms in silicon and germanium together with the structure of the self-interstitial itself. The observed properties of the defect are in excellent agreement with those calculated for the self-interstitial binding two hydrogen atoms.
HIPERTRANS (High Performance Transport network modelling and Simulation) is a fast and visually representative simulator that can predict traffic on a given urban road network. It was designed using object-oriented te...
详细信息
Portable and effcient ways for calling numerical high performance software libraries from HPF programs are investigated. The methods suggested utilize HPF’s EXTRINSIC mechanism and are independent of implementation d...
详细信息
As cloud adoption increases, so do the number of available cloud service providers. Moving complex applications between clouds can be beneficial—or other times necessary—but achieving this so-called cloud portabilit...
详细信息
First-principles molecular-dynamics simulations having a duration of 8 ps have been used to study the static, dynamic, and electronic properties of Ga at the temperatures 702 and 982 K. The simulations use the density...
First-principles molecular-dynamics simulations having a duration of 8 ps have been used to study the static, dynamic, and electronic properties of Ga at the temperatures 702 and 982 K. The simulations use the density-functional pseudopotential method and the system is maintained on the Born-Oppenheimer surface by conjugate gradients relaxation. The static structure factor and radial distribution function of the simulated system agree very closely with experimental data, but the diffusion coefficient is noticeably lower than measured values. The long simulations allow us to calculate the dynamical structure factor S(q,ω). A sound-wave peak is clearly visible in S(q,ω) at small wave vectors, and we present results for the dispersion curve and hence the sound velocity, which is close to the experimental value. The electronic density of states is very close to the free-electron form. Values of the electrical conductivity calculated from the Kubo-Greenwood formula are in satisfactory accord with measured data.
The current trend in HPC hardware is towards clusters of shared-memory (SMP) compute nodes. For applications developers the major question is how best to program these SMP clusters. To address this we study an algorit...
详细信息
暂无评论