Search results

2,817 records were found.

This document has three goals. First of all, it presents our analysis of how to use the NSIS signaling (inter-domain QOSM and intra-domain QOSM) to fulfill the QoS control in accord with the ITU-T RACF functional architecture. For this goal, we discuss how the ITU-T RACF entities in the ITU-T RACF functional architecture can be mapped to the NSIS entities and how the RACF reference points can be implemented by using the NSIS protocol suites and QOSMs. Secondly, we aim at specifying an NSIS Inter-domain QOSM for E2E QoS control across heterogeneous IP networks and applying this Inter-domain QOSM to the e2e QoS control in the ITU-T RACF functional architecture based on the above ITU-T RACF analysis. The detailed description of the NSIS Inter-domain QOSM are given and the e2e QoS control scenarios in the ITU-T RACF architecture (including...
Creation of density maps and estimation of home range is problematic for observations of animal movement at irregular intervals. We propose a technique to estimate space-time densities by separately modeling animal movement paths and velocities, both as continuous fields. First the length of trajectories for a given grid is derived; then the velocity of individual birds is interpolated using 3D kriging; finally the space-time density is calculated by dividing the density of trajectories (total length of lines per grid cell) by the aggregated velocity at that grid cell. The resulting map shows density of a species in both space and time, expressed in s/m2 units. This length-by-velocity (LV) technique is illustrated using two case studies: (1) a synthetically generated dataset using the Lorenz model; and (2) GPS recordings of 14 individu...
Mathematical model is an important tool in systems biology to study the dynamics of biological systems inside the cell. One of the significant challenges in systems biology is the lack of kinetic rates that should be measured in experiments or estimated from experimental data. This work addresses this issue by using a genetic algorithm to estimate reaction rates related to the phosphorylation and dephosphorylation of MAP kinase (ERK) in the mitogen-activated protein (MAP) kinase pathway from biological measurements. In addition, we discuss the robustness of the mathematical model with regards to the variation of kinetic rates together with external noise due to environmental fluctuations. This has been proposed as an additional criterion to choose the estimate from the candidate parameter sets that are obtained from different implement...
Previously, we proposed a direct proportional length-based DNA computing approach for weighted graph problem. The approach has been proposed essentially to overcome the shortcoming of constant proportional length-based DNA computing approach. However, by using this approach, the minimum weight of edges that can be encoded is limited. Hence, in this paper, the lower bound, in term of minimum weight that can be encoded by direct proportional length-based DNA computing is analyzed. Also, the parameters contribute to the lower bound are investigated in order to identify the relation between those parameters and the lower bound of the direct proportional length-based DNA computing approach.
The dilatancy of clay has long been considered as a function of the current stress state independent of the loading history. Experimental evidence, however, indicates the dilatancy behavior of over-consolidated (OC) clay bears close correlation with the overconsolidation ratio (OCR) of the soil. This paper presents a simple dilatancy relation for OC clays based on the modified Cam-clay (MCC) model. The dilatancy relation is integrated into a bounding surface model to predict the behavior of OC clays. With only three extra parameters added to the MCC model which can be easily calibrated by triaxial compression tests, the new model is shown to offer good predictions for the experimental data.
Chronic obstructive pulmonary disease (COPD) is an important problem of public health worldwide, with high morbidity and mortality, and with huge health economic burdens. There is a paucity of prognostic beneficial therapies. The development of novel pharmaceutical therapies in COPD is hampered by the absence of lung-specific biomarkers, which could serve as predictors of prognosis of COPD or as surrogate endpoints. Surfactant proteins (SP) would possibly serve as such a biomarker. The levels of these proteins fluctuate in the serum and in the lung of patients with COPD, dependent of the disease stage. This review will provide an overview of the functional characteristics of three surfactant-associated proteins, SP-A, SP-B and SP-D, their possible roles as prognostic predictors of COPD, and their relationship with tobacco smoking. So ...
Want to know more?If you want to know more about this cutting edge product, or schedule a demonstration on your own organisation, please feel free to contact us or read the available documentation at http://www.keep.pt/produtos/retrievo/?lang=en