TY - JOUR A1 - Sevostianov, Igor A1 - Bruno, Giovanni T1 - Maxwell scheme for internal stresses in multiphase composites JF - Mechanics of Materials N2 - The paper focuses on the reformulation of classic Maxwell's (1873) homogenization method for calculation of the residual stresses in matrix composites. For this goal, we equate the far fields produced by a set of inhomogeneities subjected to known eigenstrains and by a fictitious domain with unknown eigenstrain. The effect of interaction between the inhomogeneities is reduced to the calculation of the additional field acting on an inhomogeneity due to the eigenstrains in its neighbors. An explicit formula for residual stresses is derived for the general case of a multiphase composite. The method is illustrated by several examples. The results are compared with available experimental data as well as with predictions provided by the non-interaction approximation (Eshelby solution). It is shown that accounting for interaction can explain many experimentally observed phenomena and is required for adequate quantitative analytical modeling of the residual stresses in matrix composites. KW - Residual stress KW - Multiphase composites KW - Interaction KW - Micromechanical schemes KW - Anisotropy Y1 - 2018 U6 - https://doi.org/10.1016/j.mechmat.2018.12.005 SN - 0167-6636 SN - 1872-7743 VL - 129 SP - 320 EP - 331 PB - Elsevier CY - Amsterdam ER - TY - JOUR A1 - Semmo, Amir A1 - Döllner, Jürgen Roland Friedrich T1 - Interactive image filtering for level-of-abstraction texturing of virtual 3D scenes JF - Computers & graphics : CAG ; an international journal of applications in computer graphics N2 - Texture mapping is a key technology in computer graphics. For the visual design of 3D scenes, in particular, effective texturing depends significantly on how important contents are expressed, e.g., by preserving global salient structures, and how their depiction is cognitively processed by the user in an application context. Edge-preserving image filtering is one key approach to address these concerns. Much research has focused on applying image filters in a post-process stage to generate artistically stylized depictions. However, these approaches generally do not preserve depth cues, which are important for the perception of 3D visualization (e.g., texture gradient). To this end, filtering is required that processes texture data coherently with respect to linear perspective and spatial relationships. In this work, we present an approach for texturing 3D scenes with perspective coherence by arbitrary image filters. We propose decoupled deferred texturing with (1) caching strategies to interactively perform image filtering prior to texture mapping and (2) for each mipmap level separately to enable a progressive level of abstraction, using (3) direct interaction interfaces to parameterize the visualization according to spatial, semantic, and thematic data. We demonstrate the potentials of our method by several applications using touch or natural language inputs to serve the different interests of users in specific information, including illustrative visualization, focus+context visualization, geometric detail removal, and semantic depth of field. The approach supports frame-to-frame coherence, order-independent transparency, multitexturing, and content-based filtering. In addition, it seamlessly integrates into real-time rendering pipelines and is extensible for custom interaction techniques. (C) 2015 Elsevier Ltd. All rights reserved. KW - Image filtering KW - Level of abstraction KW - Texturing KW - Virtual 3D scenes KW - Visualization KW - Interaction Y1 - 2015 U6 - https://doi.org/10.1016/j.cag.2015.02.001 SN - 0097-8493 SN - 1873-7684 VL - 52 SP - 181 EP - 198 PB - Elsevier CY - Oxford ER - TY - JOUR A1 - Hohmann, Sarah A1 - Zohsel, Katrin A1 - Buchmann, Arlette F. A1 - Blomeyer, Dorothea A1 - Holz, Nathalie A1 - Boecker-Schlier, Regina A1 - Jennen-Steinmetz, Christine A1 - Rietschel, Marcella A1 - Witt, Stephanie H. A1 - Schmidt, Martin H. A1 - Esser, Günter A1 - Meyer-Lindenberg, Andreas A1 - Banaschewski, Tobias A1 - Brandeis, Daniel A1 - Hohm, Erika A1 - Laucht, Manfred T1 - Interacting effect of MAOA genotype and maternal prenatal smoking on aggressive behavior in young adulthood JF - Journal of neural transmission N2 - Findings on the etiology of aggressive behavior have provided evidence for an effect both of genetic factors, such as variation in the monoamine oxidase A (MAOA) gene, and adverse environmental factors. Recent studies have supported the existence of gene × environment interactions, with early experiences playing a key role. In the present study, the effects of prenatal nicotine exposure, MAOA genotype and their interaction on aggressive behavior during young adulthood were examined. In a sample of 272 young adults (129 males, 143 females) from an epidemiological cohort study, smoking during pregnancy was measured with a standardized parent interview at the offspring’s age of 3 months. Aggressive behavior was assessed between the ages of 19 and 25 years using the Young Adult Self-Report. DNA was genotyped for the MAOA 5′ untranslated region variable number of tandem repeats polymorphism (VNTR). Results revealed a significant interaction between MAOA and smoking during pregnancy, indicating higher levels of aggressive behavior in young adults carrying the MAOA low-expressing genotype who had experienced prenatal nicotine exposure (n = 8, p = .025). In contrast, in carriers of the MAOA high-expressing genotype, maternal smoking during pregnancy had no effect on aggressive behavior during young adulthood (n = 20, p = .145). This study extends earlier findings demonstrating an interaction between MAOA genotype and prenatal nicotine exposure on aggressive behavior into young adulthood. The results point to the long-term adverse effects of smoking during pregnancy on the offspring’s mental health, possibly underlining the importance of smoking cessation during pregnancy. According to the nature of the study (particularly sample size and power), analyses are exploratory and results need to be interpreted cautiously. KW - MAOA KW - Smoking during pregnancy KW - Interaction KW - Aggression KW - Longitudinal KW - Young adulthood Y1 - 2016 U6 - https://doi.org/10.1007/s00702-016-1582-x SN - 0300-9564 SN - 1435-1463 VL - 123 SP - 885 EP - 894 PB - Springer CY - Wien ER - TY - JOUR A1 - Eckstein, Bernd A1 - Muster, Judith T1 - Postbürokratie und die agile Unsicherheitsabsorption in Interaktionen JF - Gruppe, Interaktion, Organisation. Zeitschrift für Angewandte Organisationspsychologie : GIO N2 - This article for the GIO-Journal proposes a perspective rooted in functional equivalence for the analysis of post-bureaucratic reforms that partly shift the organizational absorption of uncertainty to formal interactions of their members. Postbureaucracy tries to conceptualize organizational and societal changes throughout the second half of the 20th century. Agile management frameworks that multiply interactions between members of an organization can be treated as a phenomenon of postbureaucratic organizing. Drawing on systems theory this paper examines how postbureaucratic reforms trigger new uncertainties and how they are tackled by agile concepts of management. We will illustrate this by analyzing the agile concepts Scrum and Holacracy and show how relocation triggers new needs for formalization. Doing this we will focus on how interdependencies of communication in systems of interaction are centered in different dimensions. This paper advocates for a perspective on postbureaucracy in terms of functional equivalence to grasp the connection between the renouncement of formalization and the emergence of new needs for formalization. N2 - Dieser Beitrag in der Zeitschrift GIO schlägt eine äquivalenzfunktionalistische Perspektive auf postbürokratische Reformen vor, die Teile der Unsicherheitsabsorption von Organisationen in Interaktionssysteme verlagern. Postbürokratie versucht, organisationale und gesellschaftliche Entwicklungen in der zweiten Hälfte des 20. Jahrhunderts auf den Begriff zu bringen. Auch aktuelle agile Managementkonzepte lassen sich der Postbürokratie zuordnen und zeichnen sich unter anderem durch eine Multiplikation von Interaktionen aus. Mithilfe der Theorie sozialer Systeme untersuchen wir wie neue Unsicherheiten in Organisationen durch postbürokratische Reformen entstehen und von agilen Managementkonzepten bearbeitet werden. An den agilen Konzepten Scrum und Holacracy wird gezeigt, dass diese Verlagerung neuen Formalisierungsbedarf produziert. Im Fokus stehen dabei die Zentrierungen kommunikativer Interdependenzen in Interaktionen in der Sach‑, Zeit- und Sozialdimension. Der Beitrag plädiert für eine äquivalenzfunktionalistische Perspektive auf Postbürokratie, die den Zusammenhang von Formalisierungsverzicht in Organisationen und neuen Formalisierungsbedarfen als funktionalen Leistungszusammenhang begreift. T2 - Post-bureaucracy and the agile absorption of uncertainty through interaction KW - Post-bureaucracy KW - Hybridity KW - Interaction KW - Agile KW - Systems theory KW - Postbürokratie KW - Hybridität KW - Interaktion KW - Agilität KW - Systemtheorie Y1 - 2021 U6 - https://doi.org/10.1007/s11612-021-00599-1 SN - 2366-6145 SN - 2366-6218 VL - 52 IS - 4 SP - 649 EP - 657 PB - Springer CY - Wiesbaden ER - TY - JOUR A1 - Böttcher, Steven A1 - Merz, Christoph A1 - Lischeid, Gunnar A1 - Dannowski, Ralf T1 - Using Isomap to differentiate between anthropogenic and natural effects on groundwater dynamics in a complex geological setting JF - Journal of hydrology N2 - Due to increasing demands and competition for high quality groundwater resources in many parts of the world, there is an urgent need for efficient methods that shed light on the interplay between complex natural settings and anthropogenic impacts. Thus a new approach is introduced, that aims to identify and quantify the predominant processes or factors of influence that drive groundwater and lake water dynamics on a catchment scale. The approach involves a non-linear dimension reduction method called Isometric feature mapping (Isomap). This method is applied to time series of groundwater head and lake water level data from a complex geological setting in Northeastern Germany. Two factors explaining more than 95% of the observed spatial variations are identified: (1) the anthropogenic impact of a waterworks in the study area and (2) natural groundwater recharge with different degrees of dampening at the respective sites of observation. The approach enables a presumption-free assessment to be made of the existing geological conception in the catchment, leading to an extension of the conception. Previously unknown hydraulic connections between two aquifers are identified, and connections revealed between surface water bodies and groundwater. (C) 2014 Elsevier B.V. All rights reserved. KW - Groundwater KW - Lake KW - Interaction KW - Isometric feature mapping KW - Time series analysis Y1 - 2014 U6 - https://doi.org/10.1016/j.jhydrol.2014.09.048 SN - 0022-1694 SN - 1879-2707 VL - 519 SP - 1634 EP - 1641 PB - Elsevier CY - Amsterdam ER - TY - JOUR A1 - Buddeberg, Jonas A1 - Jenny, Bernhard A1 - Willett, Wesley T1 - Interactive shearing for terrain visualization: an expert study JF - Geoinformatica : an international journal on advances of computer science for geographic information systems KW - Terrain maps KW - Depth perception KW - Interaction KW - Plan oblique relief KW - Expert study KW - Web maps Y1 - 2017 U6 - https://doi.org/10.1007/s10707-016-0283-9 SN - 1384-6175 SN - 1573-7624 VL - 21 SP - 643 EP - 665 PB - Springer CY - Dordrecht ER - TY - JOUR A1 - Bosch, David A1 - Smimou, Kamal T1 - Traders’ motivation and hedging pressure in commodity futures markets JF - Research in international business and finance N2 - This study seeks to explain the major drivers of trading activity in commodity futures markets and gage the effect of trading activity on commodity prices. Rather than concentrating on a specific commodity subgroup or a particular type of commodity traders, we provide an extensive overview of the behavior across all market participants and their influence on commodity prices by using a broad set of commodity futures contracts. Although commodity futures returns show co-movement with financial fundamentals (U.S. dollar index, equity, and bond markets), based on the Disaggregated Commitment of Traders Report (DCOT), this relationship cannot be attributed to trading activity. Pricing in commodity markets can be predominantly attributed to hedgers and influential speculators (money managers), whereas small speculators (nonreportable traders) are crucial to some soft commodity futures similar to dealers in metals commodity futures. Furthermore, we find limited cases where inventory changes exert a sizable influence on position changes of DCOT traders. KW - Hedgers KW - Speculators KW - Motivation KW - Interaction KW - Futures prices KW - Commodity KW - markets Y1 - 2021 U6 - https://doi.org/10.1016/j.ribaf.2021.101529 SN - 0275-5319 SN - 1878-3384 VL - 59 PB - Elsevier CY - Amsterdam ER -