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See detailAnalogies to Succeed: Application to a Service Design Problem
Moreno Grandas, Diana Paola UL; Yang, Maria; Blessing, Lucienne UL et al

in Laakso, Miko; Ekman, Kalevi (Eds.) NordDesign 2014 Conference (2014, August)

This study aims to expand current understanding of ideation methods and its transferability from product design domain to service design domain. It applies two Design-by-Analogy (DbA) ideation methods ... [more ▼]

This study aims to expand current understanding of ideation methods and its transferability from product design domain to service design domain. It applies two Design-by-Analogy (DbA) ideation methods (WordTree and SCAMPER) to a real service design problem in an expert participants setting. Quantity and Novelty metric results are analysed along with design fixation effects. Both DbA methods produced statistically significant larger number of novel ideas when compared to the control. The number of novel ideas with SCAMPER method doubled those generated via WordTree. Fixation effects were counterintuitive since SCAMPER appears to be a method that promotes both fixation and de-fixation effects. These findings suggest DbA ideation methods offer positive capabilities for assisting designers to generate solutions for service design problems. [less ▲]

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See detailAnalyse prozessbezogener Einflussfaktoren zur Steigerung der Robustheit von Produktenwicklungsprojekten
Gericke, Kilian UL; Blessing, Lucienne UL

in Proceedings of 17th Symposium Design for X (2006)

Auf Basis des Konzeptes der Robustheit von Produktentwicklungsprojekten werden Effekte dargelegt, die zu Planungsabweichungen führen. Das Konzept wird durch eine Diskussion der Erfolgskriterien von ... [more ▼]

Auf Basis des Konzeptes der Robustheit von Produktentwicklungsprojekten werden Effekte dargelegt, die zu Planungsabweichungen führen. Das Konzept wird durch eine Diskussion der Erfolgskriterien von Projekten und möglichen Ansatzpunkten zur Steigerung der Robustheit umrissen. Als Ergebnis einer Literaturstudie wurden Problemschwerpunkte hinsichtlich der Ursachen von Planungsabweichungen und deren Erscheinungsformen identifiziert. Auf Grundlage dieser Studien lassen sich jedoch keine Ansätze zur Steigerung der Robustheit von Produktentwicklungsprojekten ableiten. Die Betrachtung der Studien bildet den Ausgangspunkt für eigene Untersuchungen, die zu einem besseren Verständnis der Ursachen von Planungsabweichungen in Produktentwicklungsprojekten und zur Ableitung von Handlungsempfehlungen führen sollen. [less ▲]

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See detailAnalysis and modelling of the noise generation during vibratory pile driving and determination of the optimization potential
Hanus, Vincent UL

Doctoral thesis (2010)

Impact driving, pressing and vibrodriving are the three main methods to drive sheet piles. The sound level generated during vibrodriving varies almost between the very high level of an impact driving and ... [more ▼]

Impact driving, pressing and vibrodriving are the three main methods to drive sheet piles. The sound level generated during vibrodriving varies almost between the very high level of an impact driving and the lowest sound level of a pressing. In the first part of this doctoral thesis, sound measurements feasibility is thoroughly studied. Particular attention is paid to the measurement conditions on construction sites and to the measurement methods (sound power level, beamforming and thermography). These methods are outlined and the provided results are compared. In addition, the different causes of noise are analysed and the influence of various parameters is quantified. In the second part, the acceleration measurements of the full-scale experiments are used to calibrate a Finite Element model. A parametric study analyses how the most important mechanical parameters influence the noise level. This research has shown that a decrease of the noise generation on construction sites can be obtained by two ways: by recommendations for installation of sheet piles at the construction site, and by requirement of constructive measures that significantly reduce the noise level. [less ▲]

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See detailAnalysis and Visualisation of Project Structure using Linkography: Focussing Project Risk Management
Gericke, Kilian UL; Kleinod, Björn; Blessing, Lucienne UL

in Proceedings of the ASME 2009 International Design Engineering Technical Conferences & 21st International Conference on Design Theory and Methodology IDETC/DTM 2009 (2009)

Product development projects are difficult to plan due to complexity, dynamics, lack of transparency and polytely. Risk Management is often used to cope with this situation. Linkography is adapted with ... [more ▼]

Product development projects are difficult to plan due to complexity, dynamics, lack of transparency and polytely. Risk Management is often used to cope with this situation. Linkography is adapted with the aim to ease the effort of the Risk Management process. Linkography is used to focus all Risk Management activities on those work packages which might affect the project the most in the case of failing the expected outcome. The criticality of a work package is defined by the number of links to other work packages, its duration and its costs. By applying Linkography as a Risk Management method, a prioritized list of work packages can be generated which pass consecutively through the usual Risk Management process. Unlike other methods, Linkography supports the user in a visual manner. Hence, Linkography can easily be used for communication with unskilled stakeholders. [less ▲]

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See detailAnalysis of biochemical networks using linear programming
Simeonidis, Vangelis UL; Dartnell, Lewis; Bogle, I. David L. et al

in Proceedings of the 7th World Congress of Chemical Engineering on CD-ROM (2005, December)

The application of mathematical programming methodologies to biochemical systems is demonstrated with the presentation of a linear programming (LP) algorithm for calculating minimal pathway distances in ... [more ▼]

The application of mathematical programming methodologies to biochemical systems is demonstrated with the presentation of a linear programming (LP) algorithm for calculating minimal pathway distances in biochemical networks. Minimal pathway distances are identified as the smallest number of steps separating two nodes in the network. Two case studies are examined: 1) the minimal distances for Escherichia coli Small Molecule Metabolism (SMM) enzymes are calculated and their correlations with genome distance and enzyme function are considered; 2) a study of the p53 cell cycle and apoptosis control network is performed in order to assess the survivability of the network to both random node failures and a directed assault, by studying the modification of the network’s diameter for successive protein knockouts. The results verify the applicability of the algorithm to problems of biochemical nature. [less ▲]

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See detailAnalysis of complementary methodologies to assess the environmental impact of Luxembourg’s net consumption
Jury, Colin; Rugani, Benedetto; Hild, Paula UL et al

in Environmental Science & Policy (2013), 27

The choice of accounting methods and indicators to support national stakeholders and public authorities in environmental decision-making policies is made difficult by the extensive number of available ... [more ▼]

The choice of accounting methods and indicators to support national stakeholders and public authorities in environmental decision-making policies is made difficult by the extensive number of available tools and the general divergence of scientific opinions on their effectiveness. In this paper, a set of life cycle-based approaches are compared and a methodological framework is recommended to support policy makers in the evaluation and choice of environmental impact mitigation strategies. The net consumption (=production + imports exports) of Luxembourg, taken as a case study, is inventoried based on different Environmentally Extended Input–Output (EE-IO) scenarios and further assessed using the Ecological Footprint (EF), ReCiPe and Solar Energy Demand (SED). All the compartments of resources extraction and pollutant emissions and the main environmental impacts gener- ated by the Luxembourgish economic trade-offs are evaluated. Results highlight the need for higher consistency in the use of EE-IO tables mainly because of the uncertainty affecting the environmental extensions (EEs). This aspect plays a major role when applying different assessment methods and relevant changes in terms of overall environmental impact are observed according to different sets of resources and emissions inventoried. These changes, however, do not substantially influence the results at the level of single economic sector’s contribution. Regardless the consumption scenario and the indicator considered, the financial and banking sectors contribute to more than 40% to the total EF, SED and ReCiPe results. Strengths and weaknesses of each indicator are discussed, and direct and indirect contribution analyses by sector allowed outlining strategies for impact mitigation. [less ▲]

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See detailAnalysis of composite plates by a unified formulation-cell based smoothed finite element method and field consistent elements
Natarajan, S.; Ferreira, Ana UL; Bordas, Stéphane UL et al

in Composite Structures (2013), 105

In this article, we combine Carrera's Unified Formulation (CUF) [13,7] and cell based smoothed finite element method [28] for studying the static bending and the free vibration of thin and thick laminated ... [more ▼]

In this article, we combine Carrera's Unified Formulation (CUF) [13,7] and cell based smoothed finite element method [28] for studying the static bending and the free vibration of thin and thick laminated plates. A 4-noded quadrilateral element based on the field consistency requirement is used for this study to suppress the shear locking phenomenon. The combination of cell based smoothed finite element method and field consistent approach with CUF allows a very accurate prediction of field variables. The accuracy and efficiency of the proposed approach are demonstrated through numerical experiments. © 2013 Elsevier Ltd. [less ▲]

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See detailAnalysis of composite plates through cell-based smoothed finite element and 4-noded mixed interpolation of tensorial components techniques
Rodrigues, J. D.; Natarajan, S.; Ferreira, Ana UL et al

in Computers & Structures (2014), 135

The static bending and the free vibration analysis of composite plates are performed with Carrera's Unified Formulation (CUF). We combine the cell-based smoothed finite element method (CSFEM) and the 4 ... [more ▼]

The static bending and the free vibration analysis of composite plates are performed with Carrera's Unified Formulation (CUF). We combine the cell-based smoothed finite element method (CSFEM) and the 4-noded mixed interpolation of tensorial components approach (MITC4). The smoothing method is used for the approximation of the bending strains, whilst the mixed interpolation allows the calculation of the shear transverse stress in a different manner. With a few numerical examples, the accuracy and the efficiency of the approach is demonstrated. The insensitiveness to shear locking is also demonstrated. © 2014 Elsevier Ltd. All rights reserved. [less ▲]

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See detailAnalysis of Cooperative Bus Priority at Traffic Signals
Seredynski, Marcin; Laskaris, Georgios UL; Viti, Francesco UL

in IEEE Transactions on Intelligent Transportation Systems (2019)

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See detailAN ANALYSIS OF DESIGN PROCESS MODELS ACROSS DISCIPLINES
Gericke, Kilian UL; Blessing, Lucienne UL

in Proceedings of the 12th International Design Conference - DESIGN 2012 (2012)

This paper presents a comparison of design methodologies and process models from nine disciplines. The evolutionary development of the approaches, which can be traced back to similar roots, lead to ... [more ▼]

This paper presents a comparison of design methodologies and process models from nine disciplines. The evolutionary development of the approaches, which can be traced back to similar roots, lead to process models which are now adapted to specific design disciplines but still have many similarities. Most of the established approaches have not been adapted to many of the challenges of current design practice and represent isolated views on the design process. This comparison is intended to provide a basis for consolidation and reformation of design methodology. [less ▲]

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See detailAn Analysis of Functional Modelling Approaches Across Disicplines
Eisenbart, Boris UL; Gericke, Kilian UL; Blessing, Lucienne UL

in AI EDAM: Artificial Intelligence for Engineering Design Analysis and Manufacturing (2013), 27(3),

Authors across disciplines propose functional modeling as part of systematic design approaches, in order to support and guide designers during conceptual design. The presented research aims at ... [more ▼]

Authors across disciplines propose functional modeling as part of systematic design approaches, in order to support and guide designers during conceptual design. The presented research aims at contributing to a better understanding of the diverse functional modeling approaches proposed across disciplines. The article presents a literature review of 41 modeling approaches from a variety of disciplines. The analysis focuses on what is addressed by functional modeling at which point in the proposed conceptual design process (i.e., in which sequence). The gained insights lead to the identification of specific needs and opportunities, which could support the development of an integrated functional modeling approach. The findings suggest that there is no such shared sequence for functional modeling across disciplines. However, a shared functional modeling perspective has been identified across all reviewed disciplines, which could serve as a common basis for the development of an integrated functional modeling approach. [less ▲]

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See detailAnalysis of functionally graded material plates using triangular elements with cell-based smoothed discrete shear gap method
Natarajan, S; Ferreira; Bordas, Stéphane UL et al

in Mathematical Problems in Engineering (2014), Article ID 247932

In this paper, a cell based smoothed finite element method with discrete shear gap technique is employed to study the static bending, free vibration, mechanical and thermal buckling behaviour of ... [more ▼]

In this paper, a cell based smoothed finite element method with discrete shear gap technique is employed to study the static bending, free vibration, mechanical and thermal buckling behaviour of functionally graded material (FGM) plates. The plate kinematics is based on the first order shear deformation theory and the shear locking is suppressed by a discrete shear gap method. The shear correction factors are evaluated by employing the energy equivalence principle. The material property is assumed to be temperature dependent and graded only in the thickness direction. The effective properties are computed by using the Mori-Tanaka homogenization method. The accuracy of the present formulation is validated against available solutions. A systematic parametric study is carried out to examine the influence the gradient index, the plate aspect ratio, skewness of the plate and the boundary conditions on the global response of the FGM plates. The effect of a centrally located circular cutout on the global response is also studied. [less ▲]

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See detailAnalysis of the impact of ROS in networks describing neurodegenerative diseases
Ignatenko, Andrew UL

Doctoral thesis (2016)

In the current thesis the model of the ROS management network is built using the domino principle. The model offers insight into the design principles underlying the ROS management network and enlightens ... [more ▼]

In the current thesis the model of the ROS management network is built using the domino principle. The model offers insight into the design principles underlying the ROS management network and enlightens its functionality in the diseases such as cancer and Parkinson’s disease (PD). It is validated using experimental data. The model is used for in silico study of the ROS management dynamics under the stress conditions (oxidative stress). This highlights the phenomena of both adaptation to stress and the stress accumulation effect in case of repeated stress. This study also helps to discover the potential ways to a personalized treatment of the insufficient ROS management. The different ways of a control of the ROS management network are shown using the optimal control approach. Obtained results could be used for a seeking of the treatment strategies to fix the ROS management failures caused by an oxidative stress, neurodegenerative diseases, etc. Or, in vice versa, to develop the ways of a controllable cell death that might be used in cancer research. [less ▲]

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See detailAnalysis of thermoelastic waves in a two-dimensional functionally graded materials domain by the Meshless Local Petrov-Galerkin (MLPG) method
Ahmad Akbari, R.; Bagri, Akbar; Bordas, Stéphane UL et al

in Computer Modeling in Engineering & Sciences (2010), 65(1), 27-74

This contribution focuses on the simulation of two-dimensional elastic wave propagation in functionally graded solids and structures. Gradient volume fractions of the constituent materials are assumed to ... [more ▼]

This contribution focuses on the simulation of two-dimensional elastic wave propagation in functionally graded solids and structures. Gradient volume fractions of the constituent materials are assumed to obey the power law function of position in only one direction and the effective mechanical properties of the material are determined by the Mori–Tanaka scheme. The investigations are carried out by extending a meshless method known as the Meshless Local Petrov-Galerkin (MLPG) method which is a truly meshless approach to thermo-elastic wave propagation. Simulations are carried out for rectangular domains under transient thermal loading. To investigate the effect of material composition on the dynamic response of functionally graded materials, a metal/ceramic (Aluminum (Al) and Alumina (Al2O3) are considered as ceramic and metal constituents) composite is considered for which the transient thermal field, dynamic displacement and stress fields are reported for different material distributions. [less ▲]

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See detailAnalytical solutions to feedback systems on the special orthogonal group SO(n)
Markdahl, J.; Thunberg, Johan UL; Hoppe, J. et al

in the proceeding of the 52nd Annual Conference on Decision and Control (2013)

This paper provides analytical solutions to the closed-loop kinematics of two almost globally exponentially stabilizing attitude control laws on the special orthogonal group SO(n). By studying the general ... [more ▼]

This paper provides analytical solutions to the closed-loop kinematics of two almost globally exponentially stabilizing attitude control laws on the special orthogonal group SO(n). By studying the general case we give a uniform treatment to the cases of SO(2) and SO(3), which are the most interesting dimensions for application purposes. Working directly with rotation matrices in the case of SO(3) allows us to avoid certain complications which may arise when using local and global many-to-one parameterizations. The analytical solutions provide insight into the transient behaviour of the system and are of theoretical value since they can be used to prove almost global attractiveness of the identity matrix. The practical usefulness of analytical solutions in problems of continuous time actuation subject to piece-wise unavailable or discrete time sensing are illustrated by numerical examples. [less ▲]

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See detailAnalyzing the correlation between commuting satisfaction and travelling utility
Sprumont, François UL; Astegiano, Paola; Viti, Francesco UL

Scientific Conference (2016, July 13)

The interest for travel satisfaction has rapidly grown during the past two decades. Since the development of Discrete Choice Theory, doing a trip was mostly described as a pure derived activity without ... [more ▼]

The interest for travel satisfaction has rapidly grown during the past two decades. Since the development of Discrete Choice Theory, doing a trip was mostly described as a pure derived activity without utility per se but nowadays many scholars have demonstrated that individuals might be satisfied in performing the trip itself. However, little is still known on the relation between the travelling utility and the stated satisfaction for a specific trip. The objective of this paper is to analyse the relation between the stated commuting satisfaction and the utility of the associated trip thanks to the Logsum function, which is often used to represent the aggregated utility of a set of travel alternatives. The results of a travel survey implemented at the University of Luxembourg in 2012, show that the utility function, expressed through its Logsum, is positively correlated with the stated commuting satisfaction. While the Logsum function of the travelling utility might, to some extent, approximate the travelling satisfaction, some variations in the correlation magnitude, due to context particularities and socio-demographic attributes, are observed and discussed in this study. [less ▲]

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See detailAnticipation of brain shift in Deep Brain Stimulation automatic planning
Bilger, Alexandre UL; Cotin, Stephane; Duriez, Christian et al

in IEEE Engineering in Medicine and Biology Society (2015)

Deep Brain Stimulation is a neurosurgery procedure consisting in implanting an electrode in a deep structure of the brain. This intervention requires a preoperative planning phase, with a millimetric ... [more ▼]

Deep Brain Stimulation is a neurosurgery procedure consisting in implanting an electrode in a deep structure of the brain. This intervention requires a preoperative planning phase, with a millimetric accuracy, in which surgeons decide the best placement of the electrode depending on a set of surgical rules. However, brain tissues may deform during the surgery because of the brain shift phenomenon, leading the electrode to mistake the target, or moreover to damage a vital anatomical structure. In this paper, we present a patient-specific automatic planning approach for DBS procedures which accounts for brain deformation. Our approach couples an optimization algorithm with FEM based brain shift simulation. The system was tested successfully on a patient-specific 3D model, and was compared to a planning without considering brain shift. The obtained results point out the importance of performing planning in dynamic conditions. [less ▲]

Detailed reference viewed: 46 (1 UL)