As Vehicle-to-Everything (V2X) communication technologies gain prominence, ensuring human safety from radiofrequency (RF) electromagnetic fields (EMF) becomes paramount. This study critically examines human RF exposure in the context of ITS-5.9 GHz V2X connectivity, employing a combination of numerical dosimetry simulations and targeted experimental measurements. The focus extends across Road-Side Units (RSUs), On-Board Units (OBUs), and, notably, the advanced vehicular technologies within a Tesla Model S, which includes Bluetooth, Long Term Evolution (LTE) modules, and millimeter-wave (mmWave) radar systems. Key findings indicate that RF exposure levels for RSUs and OBUs, as well as from Tesla’s integrated technologies, consistently remain below the International Commission on Non-Ionizing Radiation Protection (ICNIRP) exposure guidelines by a significant margin. Specifically, the maximum exposure level around RSUs was observed to be 10 times lower than ICNIRP reference level, and Tesla’s mmWave radar exposure did not exceed 0.29 W/m2, well below the threshold of 10 W/m2 set for the general public. This comprehensive analysis not only corroborates the effectiveness of numerical dosimetry in accurately predicting RF exposure but also underscores the compliance of current V2X communication technologies with exposure guidelines, thereby facilitating the protective advancement of intelligent transportation systems against potential health risks.
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Background: Revealing tacit knowledge often is seen as very valuable for organizations, although it is usually challenging to enunciate and share this type of knowledge. Methods: This study uses a participatory design and the application of a board gaming simulation as instruments to extract tacit knowledge. To illustrate this application, the gaming simulation is played with entrepreneurs from horticulture. Horticulture represents a complex social system where tacit knowledge plays a major role in the trade process. A participatory design process is used to explore whether the design and play of gaming simulations enable participants to explicate their tacit knowledge. Participants’ participation in designing the gaming simulation explicated that reconstructing reality was a prerequisite for their commitment. Results: The results from playing simulation sessions show that participants were able to: (1) narrow down the anecdotic behaviour to a few factors; (2) to structure these factors; (3) explore how these factors relate to trade barriers and (4) to explain which tactics are applied to foster trade. Conclusion: The educational value of this study is that it helped entrepreneurs in understanding complex real-life situations.
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From the article: "Project execution in the construction industry faces major challenges, e.g. difficulty in coordination and cooperation. Operational procurement during project execution is no exception. In this paper we construct a maturity model, based on earlier work, consisting of six dimensions (goal, control, process, organization, information, technology) and five maturity stages (transactional-oriented, commercial-oriented, coordination, internal-optimized, external-optimized). The model can be used to determine the level of procurement maturity for each of the dimensions, and for the determination of a strategy for growth in the construction industry. With input from a major construction firm in the Netherlands, through simulating tooling, the model is evaluated for its contribution to growth in operational excellence. Results of the simulation show support for a relation between maturity growth and increased operational excellence." Recommended Citation Xing, Xiaochun; Versendaal, Johan; van den Akker, Marjan; and De Bevere, Bastiaan, "Maturity of Operational Procurement in the Construction Industry: A Business/IT-Alignment Perspective" (2011). BLED 2011 Proceedings. Paper 22. http://aisel.aisnet.org/bled2011/22 Affiliation: Xing Xiaochun - Swets Information Services, Netherlands; Johan Versendaal - Utrecht University, Netherlands; HU University of Applied Sciences, Netherlands; Marjan van den Akker - Utrecht University, Netherlands; Bastiaan De Bevere - Ballast Nedam, Netherlands.
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This paper introduces a novel distributed algorithm designed to optimize the deployment of access points within Mobile Ad Hoc Networks (MANETs) for better service quality in infrastructure less environments. The algorithm operates based on local, independent execution by each network node, thus ensuring a high degree of scalability and adaptability to changing network conditions. The primary focus is to match the spatial distribution of access points with the distribution of client devices while maintaining strong connectivity to the network root. Using autonomous decision-making and choreographed path-planning, this algorithm bridges the gap between demand-responsive network service provision and the maintenance of crucial network connectivity links. The assessment of the performance of this approach is motivated by using numerical results generated by simulations.
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The Maritime Spatial Planning (MSP) Challenge simulation platform helps planners and stakeholders understand and manage the complexity of MSP. In the interactive simulation, different data layers covering an entire sea region can be viewed to make an assessment of the current status. Users can create scenarios for future uses of the marine space over a period of several decades. Changes in energy infrastructure, shipping, and the marine environment are then simulated, and the effects are visualized using indicators and heat maps. The platform is built with advanced game technology and uses aspects of role-play to create interactive sessions; it can thus be referred to as serious gaming. To calculate and visualize the effects of planning decisions on the marine ecology, we integrated the Ecopath with Ecosim (EwE) food web modeling approach into the platform. We demonstrate how EwE was connected to MSP, considering the range of constraints imposed by running scientific software in interactive serious gaming sessions while still providing cascading ecological feedback in response to planning actions. We explored the connection by adapting two published ecological models for use in MSP sessions. We conclude with lessons learned and identify future developments of the simulation platform.
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De maritieme industrie staat voor een grote duurzaamheidsopgave, waarbij oude methodes niet meer toereikend zijn. Nieuwe technieken (zoals grootschalige sensormetingen, dataverwerking, gegevensmodellering) kunnen ondersteuning bieden bij het ontwerpen van de schepen van de toekomst. Naast dit hoofdonderwerp wordt er ook aandacht geschonken aan een stabiliteitsgame, bovenwettelijke veiligheidsmaatregelen en de digital twin.
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In deze lectorale rede wordt eerst geschetst hoe de maritieme industrie zich op een kruispunt van wegen bevindt. Met op de ene weg de enorme opgave van het ontwerpen, bouwen en exploiteren van een revolutionair nieuwe generatie van schone en veilige schepen. En op de andere de beschikbaarheid van steeds betere ontwerpgereedschappen, die gedreven wordt door krachtige ontwikkelingen op het gebied van (numerieke) wiskunde, IT, mathematisch modelleren, visualisatie en simulaties. Vervolgens wordt aangegeven op welke wijze het lectoraat meent hierbij van dienst te kunnen zijn, en welke concrete onderwijs- en onderzoeksinspanningen daartoe voorgenomen zijn.
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The inefficiency of maintaining static and long-lasting safety zones in environments where actual risks are limited is likely to increase in the coming decades, as autonomous systems become more common and human workers fewer in numbers. Nevertheless, an uncompromising approach to safety remains paramount, requiring the introduction of novel methods that are simultaneously more flexible and capable of delivering the same level of protection against potentially hazardous situations. We present such a method to create dynamic safety zones, the boundaries of which can be redrawn in real-time, taking into account explicit positioning data when available and using conservative extrapolation from last known location when information is missing or unreliable. Simulation and statistical methods were used to investigate performance gains compared to static safety zones. The use of a more advanced probabilistic framework to further improve flexibility is also discussed, although its implementation would not offer the same level of protection and is currently not recommended.
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An important step towards improving performance while reducing weight and maintenance needs is the integration of composite materials into mechanical and aerospace engineering. This subject explores the many aspects of composite application, from basic material characterization to state-of-the-art advances in manufacturing and design processes. The major goal is to present the most recent developments in composite science and technology while highlighting their critical significance in the industrial sector—most notably in the wind energy, automotive, aerospace, and marine domains. The foundation of this investigation is material characterization, which offers insights into the mechanical, chemical, and physical characteristics that determine composite performance. The papers in this collection discuss the difficulties of gaining an in-depth understanding of composites, which is necessary to maximize their overall performance and design. The collection of articles within this topic addresses the challenges of achieving a profound understanding of composites, which is essential for optimizing design and overall functionality. This includes the application of complicated material modeling together with cutting-edge simulation tools that integrate multiscale methods and multiphysics, the creation of novel characterization techniques, and the integration of nanotechnology and additive manufacturing. This topic offers a detailed overview of the current state and future directions of composite research, covering experimental studies, theoretical evaluations, and numerical simulations. This subject provides a platform for interdisciplinary cooperation and creativity in everything from the processing and testing of innovative composite structures to the inspection and repair procedures. In order to support the development of more effective, durable, and sustainable materials for the mechanical and aerospace engineering industries, we seek to promote a greater understanding of composites.
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In a thriving, densely populated and urbanized country like the Netherlands, space is at a premium. With the steady economic growth of the 1990s and the construction and expansion of homes, business parks and infrastructure, the available space and the environment are coming under increasing pressure. Major changes are also taking place on an administrative level in the Netherlands. In some cases, influential new joint ventures are formed between public, private, and social parties (Frieling 2000). The social and administrative dynamic, and the tension that this creates in relation to spatial quality requirements, is turning into a major challenge for spatial policy. Numerous advisory bodies and policymakers are therefore advocating a spatial development policy (WRR 1998) or development planning (VROM 2001, 2002). Development planning is the opposite of admittance planning and provides increased scope for the initiatives and investments of local governments and private and social parties. Instead of passively resisting activities and exhibiting too little flexibility, governments must aim at actively entering into partnerships with other governments, the business sector, and social organizations. Together, they must develop and realize interrelated, creative concepts, projects, and programs (WRR 1998; Healey 2000;Teisman 1997;VROM Council 2001). According to the Netherlands' Ministry of Housing, Spatial Planning, and the Environment (VROM 2002), development planning requires: "active intervention by means of investments made by both public and private parties. The State shall then provide policy frameworks for the investments and harmonize them with each other. This provides scope for the initiatives of lower governments, market parties, and social organizations and supports them." Innovation, future orientation, integral concepts, stakeholder planning and new ways of public private financing, and cooperation are some of the relevant characteristics ascribed to development planning. However, the above description shows that development planning may be an interesting concept but it is also very abstract and ambiguous. Moreover, the real question is how development planning works in practice and whether it actually differs from admittance planning. How can such notions as stakeholder planning, future orientation, and innovation be realized in a region? How do spatial investments, innovation, and integral concepts come about? Does development planning really result in spatial and administrative innovation, as one would expect in theory? What is clear, however, is that development planning will have to be tackled by governments and private and social parties on a regional/provincial level. Against this background, the Netherlands Institute for Spatial Research (RPB), established on 1 January 2002, asked the Delft University of Technology to design a simulation game in which the concept of development planning can be tested in a safe environment (Mayer and Veeneman 2002; Mayer et al. 2004).
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