Search results for "Graph theory"

Precise and efficient parametric path analysis

2012

Hard real-time systems require tasks to finish in time. To guarantee the timeliness of such a system, static timing analyses derive upper bounds on the worst-case execution time (WCET) of tasks. There are two types of timing analyses: numeric and parametric. A numeric analysis derives a numeric timing bound and, to this end, assumes all information such as loop bounds to be given a priori. If these bounds are unknown during analysis time, a parametric analysis can compute a timing formula parametric in these variables. A performance bottleneck of timing analyses, numeric and especially parametric, is the so-called path analysis, which determines the path in the analyzed task with the longes…

Path Dependence of Power Relations, Path-Breaking Change and Technological Adaptation

2011

We study the path dependence of technological systems and power relations inside companies. While the existing literature suggests power relations and technology to be path dependent and influenced by each other, interactions across these evolutionary processes remain poorly understood. We studied the history of four retail firms over 40 years, applying event structure analysis to explicate key dynamics. Companies exhibited two episodes of converging path dependency, where power relations further increased technological inertia. In each case, power initially concentrated outside the central headquarters. Path-breaking change led all firms to centralize power and implement networked IT syste…

Generalization of Linked Canonical Polyadic Tensor Decomposition for Group Analysis

2019

Real-world data are often linked with each other since they share some common characteristics. The mutual linking can be seen as a core driving force of group analysis. This study proposes a generalized linked canonical polyadic tensor decomposition (GLCPTD) model that is well suited to exploiting the linking nature in multi-block tensor analysis. To address GLCPTD model, an efficient algorithm based on hierarchical alternating least squa res (HALS) method is proposed, termed as GLCPTD-HALS algorithm. The proposed algorithm enables the simultaneous extraction of common components, individual components and core tensors from tensor blocks. Simulation experiments of synthetic EEG data analysi…

Effect of the orientation on the photooxidation behaviour of polymer films

2016

Abstract The effect of the orientation on the photooxidation of polymers is quite controversial. Both improvement of the photo-resistance along the oriented direction and worsening of the photooxidation kinetic have been reported. In this work the effect of the orientation has been investigated on films of PE, PP and PET with different degree of orientation and crystallinity. The results show that the photo-stability, measured from the decay of the elongation at break curve as a function of the irradiation time, improves in the more oriented direction, but this is more and more relevant with increasing the crystallinity degree. It has been hypothesized that the reinforcing action of the ori…

1979

The dynamic orientation of membrane-bound peptides: bridging simulations and experiments.

2007

AbstractThe structural organization in a peptide/membrane supramolecular complex is best described by knowledge of the peptide orientation plus its time-dependent and spatial fluctuations. The static orientation, defined by the peptide tilt and a rotation about its molecular axis, is accessible through a number of spectroscopic methods. However, peptide dynamics, although relevant to understand the functionality of these systems, remains largely unexplored. Here, we describe the orientation and dynamics of Trp-flanked and Lys-flanked hydrophobic peptides in a lipid bilayer from molecular dynamics simulations. A novel view is revealed, where collective nontrivial distributions of time-evolvi…

Stereocontrolled approach to quinuclidine derivatives

1998

Abstract Asymmetric Michael-type cyclization of chiral enamino ester (S)-7 furnished the quinuclidinone derivative (3R, 4S)-5, with a high degree of stereoselectivity.

Rational Design of an Enneanuclear Copper(II) Complex with a Metallacyclophane Core

2004

Motives for reflections. Part one

2013

Facsimile of manuscript from the archive of Emanuels Grinbergs, University of Latvia. The article (in three pieces of manuscripts), written in Russian, contains some reflections on graph theory. It may be written in 1973.

Motives for reflections Addendum to part one

2013

The article (in three pieces of manuscripts), written in Russian, contains some reflections on graph theory. It may be written in 1973.