University of Twente Publications
University of Twente Repository provides publications of UT scientific staff, in many cases full text and publicly available.
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Mostrando recursos 1 - 20 de 21,686
Motives to mentor: Self-focused, protégé-focused, relationship-focused, organization-focused, and unfocused motives - Janssen, Suzanne; Vuuren, Mark van; Jong, Menno D.T. de
This study examines the motives mentors have for providing developmental support to their protégés. Based on qualitative interviews with 20 informal mentors, we show five broad categories of mentor motives: self-focused motives (based on individual reasons), protégé-focused motives (directed at the protégé), relationship-focused motives (directed at the relationship between the mentor and the protégé), organization-focused motives (benefiting the organization), and unfocused motives (mentoring as the result of unconscious information processing). Furthermore, based on self-determination theory, we show five subcategories of self-focused motives, ranging from extrinsic motivations to intrinsic motivations. Implications of the findings and suggestions for future research are presented
Investigation of process induced warpage for pultrusion of a rectangular hollow profile - Baran, Ismet; Hattel, Jesper H.; Akkerman, Remko
A novel thermo-chemical–mechanical analysis of the pultrusion process is presented. A process simulation is performed for an industrially pultruded rectangular hollow profile containing both unidirectional (UD) roving and continuous filament mat (CFM) layers. The reinforcements are impregnated with a commercial polyester resin mixture (Atlac 382). The reactivity of the resin is obtained from gel tests performed by the pultruder. The cure kinetics parameters are estimated from a fitting procedure against the measured temperature. The cure hardening instantaneous linear elastic (CHILE) model is adopted for the evolution of the resin elastic modulus using the temperature-dependent elastic response provided by the resin...
Present it like it is here: Creating local presence to improve online product experiences - Verhagen, Tibert; Vonkeman, Charlotte; Feldberg, Frans; Verhagen, Plon W.
Advanced online product presentation technologies such as virtual mirrors enable consumers to experience products like they are actually present with them in the real world. This study is one of the first to address the mechanism underlying this phenomenon. Inspired by literature on media technology the concept of local presence is put forward and applied to the online consumer behavior domain. A key objective of this paper is to examine whether local presence adds to our understanding of how emerging product presentation formats influence online product experiences. To this end, a laboratory experiment (N = 366) was conducted with product...
Clusters of supernova stars in knowledge-based spaces: Value creation through cooperation - Kourtit, K.; Nijkamp, P.; Vught, F.A. van
The process of value creation out of the acquisition, transfer and exploitation of scientific knowledge has become a major challenge for developed economies. Knowledge institutions like universities and R&D centres are important actors in this context. This paper offers a novel contribution to the assessment of the regional-economic importance of local and regional knowledge centres in the Eastern part of the Netherlands (provinces Gelderland and Overijssel) by exploring the potential benefits of supra-regional synergy that may arise through an alliance of three important distinct regional knowledge clusters (a 'supernova star'), viz. the technology valley, the food valley and the health...
A Systematic Review to Identify the Use of Preference Elicitation Methods in Healthcare Decision Making - Weernink, Marieke G.M.; Janus, Sarah I.M.; Til, Janine A. van; Raisch, Dennis W.; Manen, Jeannette G. van; IJzerman, Maarten J.
Preference elicitation methods help to increase patient-centred medical decision making (MDM) by measuring benefit and value. Preferences can be applied in decisions regarding reimbursement, including health technology assessment (HTA); market access, including benefit–risk assessment (BRA); and clinical care. These three decision contexts have different requirements for use and elicitation of preferences.
This systematic review identified studies using preference elicitation methods and summarized methodological and practical characteristics within the requirements of the three contexts.
The search terms included those related to MDM and patient preferences. Only articles with original data from quantitative preference elicitation methods were included.
The selected articles (n...
Mass-fractal growth in niobia/silsesquioxane mixtures: a small-angle X-ray scattering study - Besselink, R.; Elshof, J.E. ten
The nucleation and growth of niobium pentaethoxide (NPE)-derived clusters in ethanol, through acid-catalyzed hydrolysis/condensation in the presence and absence of the silsesquioxane 1,2-bis(triethoxysilyl)ethane (BTESE), was monitored at 298-333 K by small-angle X-ray scattering. The data were analyzed with a newly derived model for polydisperse mass-fractal-like structures. At 298-313 K in the absence of BTESE the data indicated the development of relatively monodisperse NPE-derived structures with self-preserving polydispersity during growth. The growth exponent was consistent with irreversible diffusion-limited cluster agglomeration. At 333 K the growth exponent was characteristic for fast-gelling reaction-limited cluster agglomeration. The reaction yielded substantially higher degrees of polydispersity....
Today's virtual water consumption and trade under future water scarcity - Orlowsky, B.; Hoekstra, A.Y.; Gudmundsson, L.; Seneviratne, Sonia I
The populations of most nations consume products of both domestic and foreign origin, importing together with the products the water which is expended abroad for their production (termed 'virtual water'). Therefore, any investigation of the sustainability of present-day water consumption under future climate change needs to consider the effects of potentially reduced water availability both on domestic water resources and on the trades of virtual water. Here we use combinations of Global Climate and Global Impact Models from the ISI–MIP ensemble to derive patterns of future water availability under the RCP2.6 and RCP8.5 greenhouse gas (GHG) concentrations scenarios. We assess...
Perception bias in route choice - Vreeswijk, J.D.; Thomas, T.; Berkum, E.C. van; Arem, B. van
Travel time is probably one of the most studied attributes in route choice. Recently, perception of travel time received more attention as several studies have shown its importance in explaining route choice behavior. In particular, travel time estimates by travelers appear to be biased against non-chosen options even if these are faster. In this paper, we study travel time perception and route choice of routes with different degrees of road hierarchy and directness. In the Dutch city of Enschede, respondents were asked to choose a route and provide their estimated travel times for both the preferred and alternative routes. These...
Accessibility modeling and evaluation: the TIGRIS XL land-use and tranport interaction model for the Netherlands. - Zondag, B.; Bok, M. de; Geurs, K.T.; Molenwijk, E.
In current practice, transportation planning often ignores the effects of major transportation improvements on land use and the distribution of land use activities, which might affect the accessibility impacts and economic efficiency of the transportation investment strategies. In this paper, we describe the model specification and application of the land use transport interaction model TIGRIS XL for the Netherlands. The TIGRIS XL land-use and transport interaction model can internationally be positioned among the recursive or quasi-dynamic land-use and transport interaction models. The National Model System, the main transport model used in Dutch national transport policy making and evaluation, is fully...
Degree-Degree Dependencies in Random Graphs with Heavy-Tailed Degrees - Hofstad, Remco van der; Litvak, Nelly
Mixing patterns in large self-organizing networks, such as the Internet, the World Wide Web, social, and biological networks are often characterized by degree-degree dependencies between neighboring nodes. In assortative networks, the degree-degree dependencies are positive (nodes with similar degrees tend to connect to each other), whereas in disassortative networks, these dependencies are negative. One of the problems with the commonly used Pearson correlation coefficient, also known as the assortativity coefficient, is that its magnitude decreases with the network size in disassortative networks. This makes it impossible to compare mixing patterns, for example, in two web crawls of different sizes. As...
Special issue on searching and mining the web and social networks - Litvak, Nelly; Vigna, Sebastiano
The past few decades have seen the rise of online social networks as a worldwide phenomenon with a high impact on our society. Beyond the obvious exposure phenomena, with obvious implications on security and privacy, people have started to become acquainted—even married!—in online social networks. In parallel, we have seen an enormous growth in terms of the number of published articles in computer science, mathematics and physics that study the organization of such networks. The availability of large free databases of friendships, collaborations and citations have made possible to study social networks at a scale and with a precision previously...
A coordination mechanism with fair cost allocation for divergent multi-echelon inventory systems - Timmer, Judith
In this paper we study the coordination of inventory control in divergent multi-echelon inventory systems under periodic review and decentralized control. Under decentralized control the installations decide upon replenishment policies that minimize their individual inventory costs. In general these policies do not coincide with the optimal policies of the system under centralized control. Hence, the total cost under decentralized control is larger than under centralized control. We present a simple coordination mechanism that removes this cost inefficiency. The upstream installations increases its base stock level while the downstream installations compensate their supplier for increased costs and provide it with additional...