42 research outputs found

    Zinsmodelle für Versicherungen - Diskussion der Anforderungen und Vergleich der Modelle von Hull-White und Cairns

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    Anwendungen von Zinsmodellen im Versicherungsbereich zeichnen sich durch die Verwendung von Zinsen verschiedener Laufzeiten, lange Vertragslaufzeiten der zu bewertenden Produkte sowie häufig einer Mindestverzinsung aus. Die Forderung einer realistischen Modellierung dieser Aspekte über lange Zeiträume hinweg ist die wesentliche Anforderung an Zinsmodelle im Versicherungsbereich. Das Fehlen beobachtbarer Preise von Versicherungsprodukten erschwert die Modellanalyse, die daher auf theoretische Modelleigenschaften sowie den Vergleich mit Referenzmodellen angewiesen ist. Der Modellvergleich unterschiedlicher Modelle stellt unterschiedliche Anforderungen an die Umsetzung der Modelle, insbesondere an Kalibrierung und Modellierung von Schocks

    Siegen Symposium for Geomeasurement Technology - Current and future challenges : from the four-eyes principle to AI

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    Die klimabedingt zu erwartende Zunahme von Extremwetterereignissen stellt die bebaute Umwelt vor erhebliche Herausforderungen und erfordert die Entwicklung geeigneter Anpassungsstrategien. Der Geomesstechnik kommt dabei eine besondere Bedeutung zu, denn verknüpft mit der mathematisch-mechanischen Modellbildung liefert sie die Grundlage für die Bewertung möglicher geomechanischer Risiken und für die daraus abzuleitenden Planungsmaßnahmen. In diesem Symposium werden die aktuellen Entwicklungen, die Möglichkeiten und Grenzen der Geomesstechnik in einem interdisziplinären und thematisch breit angelegten Kontext ausgelotet.The expected increase in extreme weather events due to climate change poses considerable challenges to the built environment and requires the development of suitable adaptation strategies. Geomeasurement technology is of particular importance in this context, because linked with mathematical-mechanical modeling it provides the basis for the assessment of possible geomechanical risks and for the planning measures to be derived from them. In this symposium, the current developments, the possibilities and limits of geomeasurement technology will be explored in an interdisciplinary and thematically broad context

    Basement membrane components are key players in specialized extracellular matrices

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    More than three decades ago, basement membranes (BMs) were described as membrane-like structures capable of isolating a cell from and connecting a cell to its environment. Since this time, it has been revealed that BMs are specialized extracellular matrices (sECMs) with unique components that support important functions including differentiation, proliferation, migration, and chemotaxis of cells during development. The composition of these sECM is as unique as the tissues to which they are localized, opening the possibility that such matrices can fulfill distinct functions. Changes in BM composition play significant roles in facilitating the development of various diseases. Furthermore, tissues have to provide sECM for their stem cells during development and for their adult life. Here, we briefly review the latest research on these unique sECM and their components with a special emphasis on embryonic and adult stem cells and their niches

    Imagery Rescripting Helps Victims Cope With Experienced Injustice

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    In clinical psychology, imagery rescripting (ImRs) is a promising intervention to target negative emotional memories after victimization experiences. The present research tested the effects of ImRs in “minor” cases of experienced injustice. After imagining being the victim of an injustice, participants (N = 272) were randomly assigned to one of four conditions in a univariate design (treatment: active ImRs, passive ImRs; control: pleasant imagery, imagery rehearsal). Dependent variables were positive and negative affect; mediator variables were justice-related satisfaction and empowerment. Both justice-related satisfaction and empowerment increased positive and decreased negative affect, but empowerment was higher in the active than in the passive ImRs condition (while justice-related satisfaction was increased by both ImRs conditions). These results suggest that ImRs can be beneficial even in minor victimization experiences and that these beneficial effects are mediated by both empowerment and justice-related satisfaction

    M.: Design by selection: A reuse-based approach for business process modeling

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    Abstract. During business process design, working procedures in organizations are represented by process models. It is an important task in any process improvement project, but both time consuming and error prone. While many organizations maintain large process model repositories, we observe that the information these repositories carry is not fully exploited during process modeling. In this paper, we present a novel approach to business process design called Design by Selection, which takes advantage of process repositories during design and facilitates reuse of process model components. These components can be static or flexible. Static ones represent the specific aspects of the process model, while flexible components realize re-use: They are defined by visual queries, which return matching process model components to be embedded in the overall process. Thus, process models can be designed in a more efficient, higher quality and less error-prone way.

    Imagery rescripting helps victims cope with experienced injustice

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    Materials and data accompanying the manuscript "Imagery Rescripting Helps Victims Cope with Experienced Injustice

    Siliciumcarbid-Feuerfestwerkstoffe für Vergasungsreaktoren

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    Silicon carbide materials represent a promising alternative in the refractory lining of high-efficiency gasification reactors. Here, recrystallised silicon carbide (RSiC) materials consisting of a threedimensional SiC scaffold without additional binding phases were investigated. Thereby, the infiltration of the emerging ashes could be observed, but no interactions with the RSiC. The results also demonstrate that the high stability of RSiC can be further improved by impregnation with carbon or ZrO2

    SiC-bonded diamond materials produced by pressureless silicon infiltration

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    Extremely hard, wear-resistant SiC-bonded diamond materials with diamond contents of approximately 45% to 60% by volume can be prepared by pressureless infiltration of shaped diamond compacts with silicon. Components with large dimensions can be produced as graded or ungraded materials. Graded components are composed of Si-infiltrated SiC base materials with diamond-SiC composite layers of 0.1 mm to several mm in thickness in regions with high loading. This creates the possibility of producing low-cost, wear-resistant components of various geometries and dimensions with bending strengths of 400–500 MPa, hardness values of 48 GPa, and fracture toughness levels of 4.5–5 MPa∙m1/2 for use in extreme wear conditions. Thermal conductivities of up to 500 W/mK were obtained, render these materials interesting for heat sinks
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