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University of Twente Publications (46,678 recursos)
University of Twente Repository provides publications of UT scientific staff, in many cases full text and publicly available.

Full-text = Public

Mostrando recursos 1 - 20 de 20,988

1. Das Wechselverhalten von Konsumenten im Strommarkt: Eine empirische Untersuchung direkter und moderierender Effekte - Henseler, Jörg
Seit der Liberalisierung des deutschen Strommarktes Ende der 1990er Jahre konkurrieren Stromanbieter um Privatkunden. Wenn Stromanbieter am Markt bestehen wollen, müssen sie Kunden gewinnen und binden. Hierzu ist eine profunde Kenntnis des Konsumentenverhaltens notwendig. Jörg Henseler untersucht, welche Faktoren bestimmen, ob ein Konsument seinen Stromanbieter wechselt. Der Autor gibt einen Überblick über den bisherigen Forschungsstand zum Wechsel¬ver¬halten von Kunden im Strommarkt sowie in vergleichbaren Märkten und leitet aus bestehenden Theorien Hypothesen zu direkten und moderierenden Effekten auf das Wechselverhalten von Konsumenten ab. Das konzeptionelle Modell überprüft er mit der PLS-Pfad¬modellierung und leitet aus ihm Handlungsempfehlungen sowohl für Anbieter in der...

2. Kundenwert als Baustein zum Unternehmenswert - Henseler, Jörg; Hoffmann, Thorsten

3. Acoustic droplet vaporization - Shpak, Oleksandr Volodymyrovych
Current tumor chemotherapy is associated with severe side effects caused by adverse effects of the drugs on healthy tissue. A local delivery of the drug has the advantage of a more controlled biodistribution of the therapeutic agent, which will reduce the side-effects, and offers the potential to use a higher concentration which will improve therapeutic efficiency. Recent studies have shown that liquid emulsion microdroplets of a size of 10 μm composed of a low-boiling point perfluorcarbon (PFC) have the potential to be a highly efficient system for local drug delivery. Moreover, nanodroplets of a size of 100 nm can extravasate...

4. Capacitively transduced polycrystalline GeSi MEM resonators - Kazmi, Syed Naveed Riaz

5. Friction surface cladding: development of a solid state cladding process - Stelt, Adrianus Anton van der
Many industries including automotive, aerospace, electronics, shipbuilding, offshore, railway and heavy equipment employ surface modification technologies to change the surface properties of a manufactured product. Often, the surface is covered (coated) with a dissimilar clad layer for this purpose and the lifetime expectancy of the manufactured product is improved. A new solid state cladding process for metals (Friction Surface Cladding, FSC) has been developed at the University of Twente. This process provides researchers and industrial practitioners of surface engineering with an alternative to existing surface modification technologies. The FSC process allows the deposition of clad material on a substrate through...

6. Decentralized management schemes for real-time and reliable communication in industrial wireless sensor and actuator networks - Zand, Pouria
Current wireless technologies for industrial applications, such asWirelessHART and ISA100.11a, use a centralized management approach in which a central network manager handles the requirements of the static network. However, such a centralized approach has several drawbacks. For example, it cannot cope with dynamicity/disturbance in large-scale networks in a real-time manner while it also incurs a high communication overhead and latency for exchanging management traffic. In this thesis, we address the drawbacks of the centralized management approach utilized in WirelessHART and ISA100.11a for real-time industrial monitoring and control applications. More specifically, we propose new decentralized network management schemes to provide an...

7. Detection of magnetic nanoparticles for clinical interventions - Visscher, Martijn
In this thesis the possibilities of detection of magnetic nanoparticles for clinical interventions are investigated. Detection of these particles in, for example, the sentinel lymph node procedure, is a good alternative for the radionuclide based methods currently in use. The thesis shows that the magnetic method can be only successful if the magnetic properties of the human tissue and the particles are effectively discriminated. Because of the dominating diamagnetic response of the surrounding tissue volume, a tiny amount of magnetic nanoparticles deeply located in the body cannot be detected using only a simple sinusoid excitation field. For an experimental exploration...

8. A new criterion for assessing discriminant validity in variance-based structural equation modeling - Henseler, Jörg; Ringle, Christian M.; Sarstedt, Marko
Discriminant validity assessment has become a generally accepted prerequisite for analyzing relationships between latent variables. For variance-based structural equation modeling, such as partial least squares, the Fornell-Larcker criterion and the examination of cross-loadings are the dominant approaches for evaluating discriminant validity. By means of a simulation study, we show that these approaches do not reliably detect the lack of discriminant validity in common research situations. We therefore propose an alternative approach, based on the multitrait-multimethod matrix, to assess discriminant validity: the heterotrait-monotrait ratio of correlations. We demonstrate its superior performance by means of a Monte Carlo simulation study, in which...

9. Onderzoek naar de wijze van bepaling van licht-reflecterende eigenschappen van asfalt deklagen - Huerne, Henny ter; Hetebrij, Dirk; Elfring, Jan
In het kader van het milieu staan op dit moment asfalt verhardingsmaterialen met sterker lichtreflecterende eigenschappen in de belangstelling. Dergelijke materialen hebben als voordeel dat door de verbeterde reflectie-eigenschappen op de wegen minder openbare verlichting nodig is en toch een goede zichtbaarheid kan worden gewaarborgd. Dit bespaart energie en armaturen. KWS ontwikkelde asfaltmengsels waarvan een deel van het mineraal aggregaat wordt vervangen door een mineraal met goede licht reflecterende eigenschappen. Aldus ontstaan asfaltsoorten die belangrijk meer licht reflecteren dan normale asfaltsoorten. De mengsels zijn geschikt voor binnenstedelijke openbare ruimte, tunnels en andere donkere plekken. De bijdrage behandelt het onderzoekstraject “hoe bepaalt men...

10. Modelling traffic hindrance caused by road construction as part of a multi-criteria assessment framework - Berkum, Eric van; Huerne, Henny ter
One of the consequences of the increased utilization of road infrastructure is more frequent maintenance work. Since generally road works result in less available road capacity, we can witness an increase in traffic hindrance, which involves delays and externalities as noise, air quality, safety and the emission of GHG. Hindrance is generally not restricted to the location where the maintenance works take place, but can occur in a wider area as a result of altered flow patterns in the whole network. The type of reconstruction, and the way the work is executed determines not only the cost and service life but...

11. The sequential price of anarchy for atomic congestion games - Jong, Jasper de; Uetz, Marc
In situations without central coordination, the price of anarchy relates the quality of any Nash equilibrium to the quality of a global optimum. Instead of assuming that all players choose their actions simultaneously, here we consider games where players choose their actions sequentially. The sequential price of anarchy, recently introduced by Paes Leme, Syrgkanis, and Tardos then relates the quality of any subgame perfect equilibrium to the quality of a global optimum. The effect of sequential decision making on the quality of equilibria, however, depends on the specific game under consideration. Here we analyze the sequential price of anarchy for atomic...

12. The effect of briefing videos in medical simulation-based education: a randomised controlled trial - Tetering, A.A.C. van; Truijens, S.E.M.; Hout - van der Jagt, M.B. van der; Wijsman, J.L.P.; Oei, S.G.
The aim of this study is to compare the effects of an affective briefing video with a textual briefing on cognitive appraisal (threat or challenge response). It is hypothesized that briefing videos will cause a threat response, which is associated with increase in cortisol and memory consolidation.

13. Method and System for Impulse Radio Wakeup - Sebastiano, Fabio; Drago, Salvatore; Breems, Lucien Johannes; Leenaerts, Dominicus Martinus Wilhelmus
Communication networks are implemented using a variety of devices and methods. In a particular embodiment for use in a communication network having RF-communication devices that communicate using a RF protocol, an RF-communication device is implemented with an RF transceiver (110) to communicate over the network using the RF protocol and being controllable in a reduced power-consumption mode in which the RF transceiver does not communicate over the network. The device also includes an RF receiver (104, 106) including an envelope detector (104) and a pulse generator circuit (106). The envelope detector circuit (104) providing an envelope-based signal to a pulse...

14. SSHCure: SSH Intrusion Detection using NetFlow and IPFIX - Hendriks, Luuk; Hofstede, Rick; Sperotto, Anna; Pras, Aiko
With this poster, we present our SSH Intrusion Detection System named SSHCure: it is the first IDS capable of distinguishing successful attacks from unsuccessful attacks, thus detecting actual compromises. As powerful as SSH is to administrators, as attractive it is to anyone with malicious intents. Measurements showing more than 700 attacks on NRENs per day emphasize this. This number is also the source of the main problem in existing detection systems: while 699 of these attacks are typically unsuccessful and therefore not interesting to network administrators or CSIRT members, a single successful one is. And its consequences possibly include severe...

15. Ethics in data sharing: developing a model for best practice - Dietrich, Sven; Ham, Jeroen van der; Pras, Aiko; Rijswijk-Deij, Roland van; Shou, Darren; Sperotto, Anna; Wynsberghe, Aimee van; Zuck, Lenore D.
As an outcome of a seminar on the 'Ethics in Data Sharing', we sketch a model of best practice for sharing data in research. We illustrate this model with two current and timely real-life cases from the context of computer and network security.

16. ReFlow: Reports on Internet Traffic - Hoogesteger, Martijn; Oliveira Schmidt, Ricardo de; Sperotto, Anna; Pras, Aiko
Internet traffic statistics can provide valuable information to network analysts and researchers about the traffic, technologies and main characteristics of today’s networks. For many years Internet2 maintained a public website with statistics about the traffic in the Abilene network. This site was called weekly reports. Although the statistics made available by Internet2 were limited to the particularities of the Abilene network, the weekly report was referenced in many research works published at top conferences and journals. These works typically used Internet2’s weekly reports as a source of information on general Internet traffic. In 2010 Internet2 discontinued their weekly reports project...

17. Affective Brain-Computer Interfaces: Special Issue Editorial - Mühl, Christian; Allison, Brandan; Nijholt, Anton; Chanel, Guillaume
Over the last several years, brain-computer interface (BCI) research has grown well beyond initial efforts to provide basic communication for people with severe disabilities that prevent them from communicating otherwise. Since BCIs rely on direct measures of brain activity, users do not have to move in any way to convey information. During the early years of BCI research, BCI systems had little to offer healthy users. Since most users can communicate quickly and easily by speaking or typing, why would healthy people use a BCI? Several different answers to this question have been presented. For example, when healthy users’ hands and/or...

18. Adapting the Complexity Level of a Serious Game to the Proficiency of Players - Oostendorp, Herre van; Spek, Erik D van der; Linssen, Jeroen
As games are continuously assessing the player, this assessment can be used to adapt the complexity of a game to the proficiency of the player in real time. We performed an experiment to examine the role of dynamic adaptation. In one condition, participants played a version of our serious game for triage training that automatically adapted the complexity level of the presented cases to how well the participant scored previously. Participants in the control condition played a version of the game with no adaptation. The adapted version was significantly more efficient and resulted in higher learning gains per instructional case,...

19. Implementation of WirelessHART in the NS-2 Simulator and Validation of Its Correctness - Zand, Pouria; Mathews, Emi; Havinga, Paul; Stojanovski, Spase; Sisinni, Emiliano; Ferrari, Paolo
One of the first standards in the wireless sensor networks domain,WirelessHART (HART (Highway Addressable Remote Transducer)), was introduced to address industrial process automation and control requirements. This standard can be used as a reference point to evaluate other wireless protocols in the domain of industrial monitoring and control. This makes it worthwhile to set up a reliable WirelessHART simulator in order to achieve that reference point in a relatively easy manner. Moreover, it offers an alternative to expensive testbeds for testing and evaluating the performance of WirelessHART. This paper explains our implementation of WirelessHART in the NS-2 network simulator. According...

20. A survey of affective brain computer interfaces: principles, state-of-the-art, and challenges - Mühl, Christian; Allison, Brandan; Nijholt, Anton; Chanel, Guillaume
Affective states, moods and emotions, are an integral part of the human nature: they shape our thoughts, govern the behavior of the individual, and influence our interpersonal relationships. The last decades have seen a growing interest in the automatic detection of such states from voice, facial expression and physiological signals, primarily with the goal of enhancing human-computer interaction with an affective component. With the advent of brain-computer interface research, the idea of affective brain-computer interfaces (aBCI), enabling affect detection from brain signals, arose. In this article, we set out to survey the field of neurophysiology-based affect detection. We outline possible...

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