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See detailA framework to identify housing location patterns using profile Hidden Markov Models
Saadi, Ismaïl ULg; Liu, Feng; El Saeid Mustafa, Ahmed Mohamed ULg et al

in Advanced Science Letters (in press)

The determination of comprehensive activity-travel patterns is important in the context of agent-based micro-simulation modelling. This paper presents an improved method based on profile Hidden Markov ... [more ▼]

The determination of comprehensive activity-travel patterns is important in the context of agent-based micro-simulation modelling. This paper presents an improved method based on profile Hidden Markov Models (pHMMs) able to include information related to the agents’ residential locations. As proposed in the framework of Liu et al. (2015), pHMMs only characterize activity-travel patterns from the activity sequences perspective. In this context, information related to the primary activity locations (e.g. home, work) is not available and, as a result, it cannot be extracted from the pHMMs themselves. With respect to this limitation, we propose to apply the framework of Liu et al. (2015) with an extension to include characterization of residential locations. Following the established guidelines, the activity sequences and their related residential locations are extracted from the activity-travel diaries in order to estimate the regularity of the activities as well as their sequential order. Subsequently, within each residential activity, we include a categorization at an aggregate level (provinces). The methodology is powerful as it characterizes any length of sequence, allowing the generation of unlimited agent plans with information about residential location. Regarding data collection, the activity-travel diaries are provided by the Belgian Household Daily Travel Survey (2010). The results obtained after the simulations indicate a good match between the predicted and observed residential locations at both the national and provincial levels. [less ▲]

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See detailResearch and Implementation of Bird-Strike Resistance Synthetic Analysis Platform for Civil Aircraft
Guo, Yingnan; Qin, Sun; Wu, Ling ULg

in Advanced Science Letters (2011), 4

Bird strike issues are known to cause substantial losses to the civil aviation industry in terms of damage and delay every year. Rules of bird strike resistance are included in many important regulations ... [more ▼]

Bird strike issues are known to cause substantial losses to the civil aviation industry in terms of damage and delay every year. Rules of bird strike resistance are included in many important regulations and guidelines of civil aviation. Based on these rules, attentions should be paid during the design and analysis process for those structures that might be apt to suffer from bird strike as leading edge, radar dome, wind shield and vertical tail. This paper describes a new software infrastructure for bird-strike design and analysis. The bird-strike resistance synthetic analysis platform is a platform that incarnates new research and innovations in bird-strike dynamic strength analysis of our research group. The platform was implement using finite element method and parametric design method based on ESI Pam-crash software, and involves a dynamic performance database of the typical aviation material, a typical structure database for bird-strike resistance, a post-processing modular for result reveal, and an estimation modular for energy absorbing. The material database covers the key constitutive model constants for many common aviation materials. Different bird model for Lagrange, Euler, and SPH algorithm are also covered to fit for different impact speed simulation. The typical structure database are very helpful to the designers because it provides the parametric model of some special bird-strike resistance structures to improve the energy absorbing ability subject to impact. The post-processing modular enables the contour and curve display for the results. The estimation modular gives judgments on the energy absorbing structure by utilizing the criterion and provides proper advices for the design for different cases. [less ▲]

Detailed reference viewed: 61 (2 ULg)