The concurrent FE2-method is a very powerful and flexible computational tool for multi-scale problems. However the effort high. conventional, staggered (“nested Newton”) solution scheme solves microscopic problem iteratively within each macroscopic Newton-Raphson (NR) iteration, although deformation gradients as boundary conditions at micro scale are only estimates. In this contribution monolit...

Abstract. Photochemical reactions of contaminants in snow and ice can be important sinks for organic inorganic compounds deposited onto from the atmosphere sources photoproducts released snowpacks into atmosphere. Snow found bulk matrix, internal liquid-like regions (LLRs), or quasi-liquid layers (QLLs) at air–ice interface, where they readily exchange with firn air. Some studies have reported ...

For modelling and evaluating the performance of modern computer communication systems, quasi-birth-and-death models (QBDs) can often be used. For such QBDs, a variety of highly efficient numerical solution algorithms have been developed. For models of practically relevant size though, the specification of QBDs at the state level is cumbersome or practically infeasible. To overcome this problem,...

The channel assignment problem (CAP) in a cellular network requires finding a channel assignment to the call requests from cells such that three types of interference constraints are not only satisfied, but also the number of channels (channel span) is minimized. This paper presents a three-stage iterative algorithm, called the Quasi-solution state evolution algorithm for CAP (QCAP). QCAP evolu...

We propose a new estimation method to fit semiparametric intensity function model multivariate spatial point processes. Our approach is based on the so-called quasi-likelihood that can produce more efficient estimators by accounting for both between- and within-process correlations. To be specific, we derive optimal estimating in class of first-order functions, where depends solution system int...

A quasi-identifier refers to a subset of attributes that can uniquely identify most tuples in a table. Incautious publication of quasi-identifiers will lead to privacy leakage. In this paper we consider the problems of finding and masking quasi-identifiers. Both problems are provably hard with severe time and space requirements. We focus on designing efficient approximation algorithms for large...

A differential polynomial G is called a divisor of a differential polynomial F if any solution of the differential equation G = 0 is a solution of the equation F = 0. We design an algorithm which for a class of quasi-linear partial differential polynomials of order k + 1 finds its quasi-linear divisors of order k.

In this paper we evaluate the variation in L 1-norm between u i h (T; x) ; i = 1; :::; J the discrete solution calculated at the moment T and u i 1 ; the asymptotic continuous solution of the system of parabolic quasi-variational inequalities with noncoercive operators. The proof uses an algorithmic approach and the system of elliptic quasi-variational inequalities results.

A physics-based multicell electrothermal equivalent circuit model is described that is applied to the large-signal microwave characterization of AlGaAs/GaAs HBT’s. This highly efficient model, which incorporates a new multifinger electrothermal model, has been used to perform dc, small-signal and loadpull characterization, and investigate parameter-spreads due to fabrication process variations....