Information technology R&amp;D: Critical trends and issues

Adams, Timothy

doi:10.1016/0740-624x(86)90089-4

Cited by 8 publications

(2 citation statements)

References 20 publications

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“…In order to fulfill that requirement, each face of the cell must have another face parallel to it and in the exactly opposite side of the cell, which earns this polyhedra the denomination of parallelohedra [37].…”

Section: Cell Geometriesmentioning

confidence: 99%

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Finite size effects in neutron star and nuclear matter simulations

Molinelli

Dorso

2015

Nuclear Physics A

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In this work we study molecular dynamics simulations of symmetric nuclear matter using a semi-classical nucleon interaction model. We show that, at sub-saturation densities and low temperatures, the solutions are non-homogeneous structures reminiscent of the "nuclear pasta" phases expected in Neutron Star Matter simulations, but shaped by artificial aspects of the simulations. We explore different geometries for the periodic boundary conditions imposed on the simulation cell: cube, hexagonal prism and truncated octahedron. We find that different cells may yield different solutions for the same physical conditions (i.e. density and temperature). The particular shape of the solution at a given density can be predicted analitically by energy minimization. We also show that even if this behavior is due to finite size effects, it does not mean that it vanishes for very large systems and it actually is independent of the system size: The system size sets the only characteristic length scale for the inhomogeneities.We then include a screened Coulomb interaction, as a model of Neutron Star Matter, and perform simulations in the three cell geometries. In this case, the competition between competing interactions of different range produces the well known nuclear pasta, with (in most cases) several structures per cell. However, we find that the results are affected by finite size in different ways depending on the geometry of the cell. In particular, at the same physical conditions and system size, the hexagonal prism yields a single structure per cell while the cubic and truncated octahedron show consistent results with more than one structure per cell. In this case, the results in every cell are expected to converge for systems much larger than the characteristic length scale that arises from the competing interactions.

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Section: Cell Geometriesmentioning

confidence: 99%

“…To quantify the size of each cell we use the distance between opposing faces L x , where x is C for cubic cell, HP for hexagonal prism cell and T O for the truncated octahedron. As a measure of the 'sphericity' of each cell, we calculate the ratio between s x the circumsphere radius and the inscribed sphere radius as in [37].…”

Section: Cell Geometriesmentioning

confidence: 99%

Finite size effects in neutron star and nuclear matter simulations

Molinelli

Dorso

2015

Nuclear Physics A

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Management of technology in Taiwan

Chiang¹

1989

J Technol Transfer

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National technological programs in Taiwan aiming at commercial applications have been proliferating. However, their management is incompletely documented. This paper uses a comparative-technology perspective to examine Taiwan's eight national programs in energy, materials, information, automation, biotechnology, electro-optics, hepatitis control, and food. It offers management implications concerning (a) national technology capability based on technology imitation and a strategy of backward integration; (b) R&D selection, technical service strategy, and performance; (c) interorganizational technology transfer; (d) alliance strategies; and (e) functional integration.

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Technology strategies in national context and national programs in Taiwan

Chiang¹

1988

Technology in Society

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Three patterns of technology strategy exemplified by the US (the innovator), Japan (the first follower) and Taiwan (the second follower) are compared in this paper. In Taiwan's experience also shows that these large-scale endeavors can give great impetus to the upgrading of government technology administration, major R&D institutions, and the overall 1 development fremework. In all, these progranris help turn the previous loose and "supply side" development pattern into a more focused and "demand side" one.These lessons may also apply to many other technology follower countries.

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Information technology R&D: Critical trends and issues

Cited by 8 publications

References 20 publications

Finite size effects in neutron star and nuclear matter simulations

Finite size effects in neutron star and nuclear matter simulations

Management of technology in Taiwan

Technology strategies in national context and national programs in Taiwan

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