In this paper we describe an aspect of the Spring virtual memory system that was influenced by the distributed object-oriented architecture of Spring. The virtual memory system supports external pagers like those provided in the MACH® operating system, yet the architecture is more flexible and provides better caching opportunities than is possible in other systems. A novel aspect of the archite...

Santa Fe Institute Bulletin SPRING 2008 51 of understanding of how low-level visual inputs can be translated into high-level conceptual descriptions has been termed the “semantic gap.” Garrett Kenyon, a theoretical neuroscientist at Los Alamos National Laboratory (LANL), and I, a computer and cognitive scientist, recently organized a workshop on this topic at the Santa Fe Institute. !e workshop...

Foraging in stopover areas influences nutritional condition of birds during spring migration. Our purpose was to determine if body mass, percent carcass water, and serum biochemistry would predict energy reserves (carcass fat and protein) in northern pintails (Anas acuta) at a spring staging area, Lake St. Pierre in Québec, Canada (46 degrees 11 'N, 73 degrees 08 'W). Northern pintails were col...

We present a mass-spring system for interactive simulation of deformable bodies. For the amount of springs we target, numerical time integration of spring displacements needs to be accelerated and the transfer of displaced point positions for rendering must be avoided. To fulfill these requirements, we exploit features of recent graphics accelerators to simulate spring elongation and compressio...

This paper introduces a new method of generating 2D flat patterns from a 3D triangulated surface by opening the bending configuration of each winged triangle pair. The flattening can be divided into four steps. First, a 3D triangulated surface is modeled with a mass–spring system that simulates the surface deformation during the flattening. Second, an unwrapping force field is built to drive th...

In this paper, MM-Model is presented for real-time simulation of 3D deformable objects on both global level and local region. This model consists of a deformable centerline and dynamic surface reconstruction mechanism based on Mass-Spring and Medial-Representation respectively. When a relatively small force is applied on the object the model works in the same way as the traditional Mass-Spring....

To construct the lumped spring-mass model considering the occupants for the offset frontal crash, the SISAME software and the NHTSA test data were used. The data on 56 kph 40% offset frontal vehicle to deformable barrier crash test of a MY2007 Mazda 6 4-door sedan were obtained from NHTSA test database. The overall behaviors of B-pillar and engine of simulation models agreed very well with the ...

A hybrid physical-based deformation modeling (HPDM) technique for our laparoscopic surgery simulation system is proposed. The proposed technique consists of three components: (i) approximate continuum free-form deformation modeling, (ii) efficient collision detection for non-rigid objects, and (iii) mass-spring modeling for force feedback implementation. Three physical-based deformation modelin...

We consider periodic solution for coupled systems of mass-spring. Three practical cases of these systems are explained and introduced. An analytical technique called Parameter Expansion Method PEM was applied to calculate approximations to the achieved nonlinear differential oscillation equations. Comparing with exact solutions, the first approximation to the frequency of oscillation produces t...

This paper presents a solution to the adaptive-control problem by considering a general discrete-time linear time-invariant dynamic model to be controlled. A new adaptive-control scheme is presented which uses an extension to the generalized secant method of solving a set of linear equations. 1] This new method is shown to signii-cantly outperform the self-tuning regulator in the control of two...