Energy conservation is crucial in wireless ad hoc sensor network design to increase network lifetime. Since communication consumes a major part of the energy used by a sensor node, efficient communication is important. Topology control aims at achieving more efficient communication by dropping links and reducing interference among simultaneous transmissions by adjusting the nodes’ transmission power. Since dropping links make a network more susceptible to node failure, a fundamental problem in wireless sensor networks is to find a communication graph with minimum interference and minimum power assignment aiming at an induced topology that can satisfy fault-tolerant properties. In this paper, we examine and propose linear integer programming formulations and a hybrid meta-heuristic GRASP/VNS (Greedy Randomized Adaptive Search Procedure/Variable Neighborhood Search) to determine the transmission power of each node while maintaining a fault-tolerant network and simultaneously minimize the interference and the total power consumption. Optimal biconnected topologies for moderately sized networks with minimum interference and minimum power are obtained using a commercial solver. We report computational simulations comparing the integer programming formulations and the GRASP/VNS, and evaluate the effectiveness of three meta-heuristics in terms of the tradeoffs between computation time and solution quality. We show that the proposed meta-heuristics are able to find good solutions for sensor networks with up to 400 nodes and that the GRASP/VNS was able to systematically find the best lower bounds and optimal solutions.
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A software system is described that uses the agent concept in the Cell Control layer. Important design goals are: the system continues as good as possible after a process crash, crashed processes are recreated whenever possible, and equivalent workstations are allocated dynamically. This project is carried out mainly to investigate whether the agent concept is applicable in such a situation. The system is not operational yet, but will be built in the period ahead. In addition, a graphic simulator for a small manufacturing system will be built for testing the agent structure.
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Many quality aspects of software systems are addressed in the existing literature on software architecture patterns. But the aspect of system administration seems to be a bit overlooked, even though it is an important aspect too. In this work we present three software architecture patterns that, when applied by software architects, support the work of system administrators: PROVIDE AN ADMINISTRATION API, SINGLE FILE LOCATION, and CENTRALIZED SYSTEM LOGGING. PROVIDE AN ADMINISTRATION API should solve problems encountered when trying to automate administration tasks. The SINGLE FILE LOCATION pattern should help system administrators to find the files of an application in one (hierarchical) place. CENTRALIZED SYSTEM LOGGING is useful to prevent coming up with several logging formats and locations. Abstract provided by the authors. Published in PLoP '13: Proceedings of the 20th Conference on Pattern Languages of Programs ACM.
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De auto is niet meer weg te denken in onze huidige westerse maatschappij en bezet een belangrijke plaats in zowel ons economische als sociale leven. Hoewel Nederland al een van de meest verkeersveilige landen ter wereld is, waren er toch nog 811 verkeersdoden in 2006. Als we ons echter realiseren dat dit slechts een kwart is van de ruim 3200 verkeersdoden in 1972, is sindsdien al veel bereikt. De Nederlandse overheid streeft naar een verdere reductie tot minder dat 580 verkeersdoden in 2020. De daarvoor noodzakelijke verbeterde verkeersveiligheid zal voor een groot deel moeten komen uit nieuwe voertuigtechnologie die ongevallen helpt voorkomen (actieve veiligheid) en de gevolgen ervan beperkt (passieve veiligheid). Een auto veilig door het hedendaagse verkeer loodsen is geen eenvoudige taak, zeker niet onder slechte weersomstandigheden en bij complexe of onoverzichtelijke verkeerssituaties. Het is dan ook niet verwonderlijk dat bij het overgrote deel van de verkeersongevallen de oorzaak, minstens ten dele, bij een menselijke fout ligt. Intelligente voertuigsystemen, die met behulp van aan het voertuig verbonden omgevingssensoren het verkeer rond het voertuig monitoren, kunnen de bestuurder assisteren. Als er zich geen bijzonderheden voordoen is de bestuurder het meest gebaat bij informatieve- en comfortverhogende systemen. Als er een gevaarlijke situatie dreigt te ontstaan, komen de veiligheidssystemen in beeld. Naarmate de kans op een ongeval toeneemt, lijkt een grotere mate van ondersteuning (van waarschuwen, via assisteren tot interveniëren) gewenst. Vanwege hun veiligheidskritische karakter moeten actieve veiligheidssystemen voldoen aan hoge eisen ten aanzien van prestatie (hoge nauwkeurigheid), robuustheid (weersomstandigheden en wegcondities) en betrouwbaarheid. Hier liggen enorme uitdagingen in zowel het ontwerp als de evaluatie van dergelijke systemen waaraan het lectoraat Automotive control van Fontys Hogescholen door praktijkgericht onderzoek en vraaggestuurd onderwijs wil bijdragen.
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The international classroom is presumably a far more effective learning environment for the acquisition of intercultural competence when students receive adequate training to make the most of their intercultural encounters. This paper provides a summary of the intercultural training taught to first-year students of an international programme in The Hague University of Applied Sciences. The purpose of the paper is to investigate how the students respond to this intercultural training as well as what signs of intercultural awareness they show after completing the course. The findings were obtained via qualitative methods such as semi-structured interviews, observations and student homework assignments. Overall, students evaluate the training positively. Furthermore, students show some awareness of the necessary ingredients for effective intercultural communication in the international classroom as well as of the challenging nature of this communication due to cultural diversity. Finally, this paper provides recommendations from the facilitators on stimulating intercultural learning in the international classroom.
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The unexpected death of a child is one of the most challenging losses as it fractures survivors’ sense of parenthood and other layers of identity. Given that not all the bereaved parents who have need for support respond well to available treatments and that many have little access to further intervention or follow-up over time, online interventions featuring therapeutic writing and peer support have strong potential. In this article we explore how a group of bereaved mothers experienced the process of participating in an online course in therapeutic writing for the integration of grief. Our research questions were: How do parents who have lost a child experience being part of an online course in therapeutic writing? What are the perceived benefits and challenges of writing in processing their grief? We followed an existential phenomenological approach and analyzed fieldwork notes (n = 13), qualitative data from the application and assessment surveys (n = 35; n = 21), excerpts from the journals of some participants (n = 3), and email correspondence with some participants (n = 5). We categorized the results in three meaning units: (1) where does my story begin? The “both and” of their silent chaos; (2) standing on the middle line: a pregnancy that does not end; (3) closures and openings: “careful optimism” and the need for community support. Participants experienced writing as an opportunity for self-exploration regarding their identities and their emotional world, as well as a means to develop and strengthen a bond with their children. They also experienced a sense of belonging, validation, and acceptance in the online group in a way that helped them make sense of their suffering. Online writing courses could be of benefit for bereaved parents who are grieving the unexpected death of a child, but do not replace other interventions such as psychotherapy. In addition to trauma and attachment informed models of grief, identity informed models with a developmental focus might enhance the impact of both low-threshold community interventions and more intensive clinical ones. Further studies and theoretical development in the area are needed, addressing dialogical notions such as the multivoicedness of the self. Lehmann OV, Neimeyer RA, Thimm J, Hjeltnes A, Lengelle R and Kalstad TG (2022) Experiences of Norwegian Mothers Attending an Online Course of Therapeutic Writing Following the Unexpected Death of a Child. Front. Psychol. 12:809848. doi: 10.3389/fpsyg.2021.809848
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As multifunctional places that combine shopping and hospitality with public space and residential functions, urban consumption spaces are sites where different normative orders surface and sometimes clash. In Amsterdam, such a clash emerged over touristification of consumption spaces, eroding place attachment for local residents and urging the city government to take action. Based on policy analysis and interviews with entrepreneurs and key informants, we demonstrate how Amsterdam’s city government is responding to this issue, using legal pluralism that exists within formal state law. Specifically, the city government combines four instruments to manage touristification of consumption spaces, targeting so-called tourist shops with the aim to drive them out of the inner city. This strategic combination of policy instruments designed on various scales and for different publics to pursue a local political goal jeopardizes entrepreneurs’ rights to legal certainty. Moreover, implicitly based on class-based tastes and distrust towards particular minority groups of entrepreneurs, this policy strategy results in institutional discrimination that has far-reaching consequences for entrepreneurs in itself, but also affects trust relations among local stakeholders.
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When the Netherlands developed a national system of vocational education at the end of the 19th century, it was a direct answer to obvious shortcomings in the technical and trade professions (De Jonge, 1968). It concentrated on training craftsmen for the traditional, mainly agrarian economy, and technicians for the new, industrial economy. The training being offered was closely related to actual professional practices. In the first place, there was a very stable occupational structure, in which professional knowledge and skills did not become obsolete quickly. This, in turn, made it possible that education was -and remained - up-to-date. Secondly, almost all teachers were also experienced craftsmen, who only started teaching after a long career. The teachers learned actual professional practices through direct experience. In addition, students were also frequently familiar with actual practice, because the occupational structure was so stable: they knew exactly for which profession they were being trained. A stable occupational structure, a clear occupational orientation by the students, and teachers with extensive firsthand work experience ensured that vocational education was a powerful learning environment. For this reason, a dual system had hardly any added value. A consequence is that the apprenticeship system in the Netherlands - as opposed to almost all surrounding countries - had a lower status and fewer students than full-time education (Teerling & Bijveld, 1982).
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This dissertation increases our insight into the role of the service employee’s intercultural competences in the service to culturally diverse customers. Investigating the effect of the intercultural competences of service employees is of major importance because, as a consequence of globalization, the number of intercultural service encounters has increased dramatically and still does. The delivery of service to a culturally diverse customer-base requires a combination of knowledge, skills and attitude; the intercultural competences (also known as Global Mindset). In this study the hotel sector has been investigated specifically. The hotel sector is an important economic player that continues to grow inspite of economic downturn. The special characteristics of hotel services make the sector also very suitable for the research of face-to-face encounters in an international context. In this dissertation, a holistic approach has been chosen, meaning that in the four empirical studies not only the perspective of the manager, but also that of the employee and the customer was investigated. All three of the above-mentioned are actors in intercultural service according to the argumentation of the ‘service-profit chain’ (Heskett, Jones, et al., 1994). Together, the manager, employee and the customer form the so-called ‘service triangle’ (Bitner, 1990).
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