University of Twente Research Information

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    143361 research outputs found

    Ontology-based security modeling in ArchiMate

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    Enterprise Risk Management involves the process of identification, evaluation, treatment, and communication regarding risks throughout the enterprise. To support the tasks associated with this process, several frameworks and modeling languages have been proposed, such as the Risk and Security Overlay (RSO) of ArchiMate. An ontological investigation of this artifact would reveal its adequacy, capabilities, and limitations w.r.t. the domain of risk and security. Based on that, a language redesign can be proposed as a refinement. Such analysis and redesign have been executed for the risk elements of the RSO grounded in the Common Ontology of Value and Risk. The next step along this line of research is to address the following research problems: What would be the outcome of an ontological analysis of security-related elements of the RSO? That is, can we identify other semantic deficiencies in the RSO through an ontological analysis? Once such an analysis is provided, can we redesign the security elements of the RSO accordingly, in order to produce an improved artifact? Here, with the aid of the Reference Ontology for Security Engineering (ROSE) and the ontological theory of prevention behind it, we address the remaining gap by proceeding with an ontological analysis of the security-related constructs of the RSO. The outcome of this assessment is an ontology-based redesign of the ArchiMate language regarding security modeling. In a nutshell, we report the following contributions: (1) an ontological analysis of the RSO that identifies six limitations concerning security modeling; (2) because of the key role of the notion of prevention in security modeling, the introduction of the ontological theory of prevention in ArchiMate; (3) a well-founded redesign of security elements of ArchiMate; and (4) ontology-based security modeling patterns that are logical consequences of our proposal of redesign due to its underlying ontology of security. As a form of evaluation, we show that our proposal can describe risk treatment options, according to ISO 31000. Finally, besides presenting multiple examples, we proceed with a real-world illustrative application taken from the cybersecurity domain.</p

    Refining the survey model of the LADM ISO 19152–2: Land registration

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    Cadastral surveying involves the delineation of property boundaries and the extent and documentation of easements and restrictions (imposed by private or public law), forming the foundation for Land Administration (LA). Survey models and processes constitute vital parts of Cadastres and Land Administration Systems (LASs). However, these models are often inadequately documented and lack standardization in practice. To address the global diversity and complexity of legal and administrative challenges in LA, standardization efforts have yielded the ISO 19152:2012 (ISO, 2012) Land Administration Domain Model (LADM), the Global Land Tool Network's (GLTN) Social Tenure Domain Model (STDM), and the OGC LandInfra/InfraGML standard. The current edition of the LADM focuses on standardised conceptual modelling of LA-related information, including a dedicated sub-package for Spatial and Surveying representation. As part of the ongoing LADM revision, a refined survey model is being developed to support a broad range of surveying and data acquisition approaches and levels of accuracy. Recognizing that surveying technology is not bound by national practices and regulations, this paper focuses specifically on the surveying aspect of LADM. It illustrates that the proposed refined survey model is applicable not only to conventional real property formation but also to participatory land rights recordation processes. The approach adopted in this research is technology-neutral, accommodating the ongoing evolution of surveying technology. It offers support for a broad range of surveying and data acquisition approaches, with varying levels of accuracy. As the demand for high-precision positioning has been persistent within the land mapping and surveying community, particularly since the initial adoption of GPS, aiming to achieve centimetre-level accuracies (initially confined to local services), the paper addresses the fundamental principles of the High Accuracy Service (HAS) concept within the proposed model. The main results presented in this paper are the conceptual model of the refined survey model of LADM Edition II (ISO19152–2), as well as an abstract, reference, cadastral surveying workflow following the principles of the proposed model

    School-Based Interventions for Increasing Autistic Pupils’ Social Inclusion in Mainstream Schools:A Systematic Review

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    School-based interventions for socially including autistic pupils in mainstream schools were systematically reviewed. Included interventions targeted at least one level of the school environment: the autistic children, the peers, the staff, and/or the physical environment, and assessed autistic pupils’ quantity and/or quality of social participation as outcome measures. Findings from 56 studies showed increased accessibility of school activities to autistic pupils, but the reciprocity and friendship between the autistic pupils and the peers were not necessarily improved. Moreover, limited interventions were available for modifying the physical environment. A more holistic strategy that moves the focus from individual children’s social skills to the larger context surrounding children, should be considered for a better inclusion of autistic children in school routine.</p

    Ceria-based composites for application in oxygen transport membranes

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    Among the gas membrane separation technologies, inorganic dense membranes, like oxygen transport membranes (OTMs), are regarded as one of the most potential and promising methods and gain considerable attention over the past decades. OTMs represent an energy-efficient and economical alternative to conventional cryogenic air separation for producing pure oxygen for oxyfuel combustion technologies as they provide high oxygen selectivity in a single-step process. Mixed ionic-electronic conductors (MIEC) are applied mostly as materials for OTMs. Compared to diverse single-phase materials, dual-phase composite materials, i.e., pure ionic-conductor Ce0.8Gd0.2O2 δ (CGO20) and electronic-conductor FeCo2O4 (FCO), may potentially fulfil these requirements completely. At the low FCO fraction (&lt;25 wt.%) in the composite, a sufficient percolation with the targeted 30 vol.% of the electronic (e)-conducting phase is achieved, thanks to phase interaction and formation to the perovskite phase. This emerged donor-doped GdFeO3 phase contributes to the electronic conductivity providing additional paths for the charge carriers. Furthermore, this Gd0.85Ce0.15Fe0.75Co0.25O3 phase was synthesized separately and exploited as an electron-conducting phase and added to the commercially available CGO20. This approach reveals a dual-phase structure after sintering, which is expected to be more chemically stable compared to FCO in particular at low pO2.The transport properties of the MIEC system are closely related to the composition and conducting properties of the individual phases in the composite, as well as microstructure features, such as density, porosity, grain size, and the presence of defects. Therefore, the objective of this work is to determine the relationship between the composition as well as phase morphology of the permeation properties in the fluorite-spinel ceramic composite by varying the ion- and electron-conducting materials in the composite. Finally, the reduction in the thickness to µm range is an important milestone for the development of CGO-FCO composite, thus the asymmetric configuration is done by using the tape casting technique

    How Stories Can Contribute Toward Quality Improvement in Long-Term Care

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    It is important to evaluate how residents, their significant others, and professional caregivers experience life in a nursing home to improve quality of care based on their needs and wishes. Narratives are a promising method to assess this experienced quality of care as they enable a rich understanding, reflection, and learning. In the Netherlands, narratives are becoming a more substantial element within the quality improvement cycle of nursing homes. The added value of using narrative methods is that they provide space to share experiences, identify dilemmas in care provision, and provide rich information for quality improvements. The use of narratives in practice, however, can also be challenging as this requires effective guidance on how to learn from this data, incorporation of the narrative method in the organizational structure, and national recognition that narrative data can also be used for accountability. In this article, 5 Dutch research institutes reflect on the importance, value, and challenges of using narratives in nursing homes.</p

    Between Aims and Execution: Value Trade-Offs in the Practical Implementation of the European Arrest Warrant?

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    The European Union (EU) increasingly develops and implements policies infused with salient and sometimes conflicting values – for instance, in migration and criminal law cooperation. However, policy implementation studies have not frequently considered how such complex value trade-offs may affect practical implementation within Member States. This article therefore quantitatively and temporally examines the practical implementation of an EU flagship criminal law measure: the simplified extradition system known as the European Arrest Warrant (EAW). Using data on EAWs decided upon by the Dutch Amsterdam District Court, we test the impact of value trade-offs by examining whether (newly introduced) safeguards for the protection of requested persons adversely affect system efficiency (measured through case turnover times). The results suggest that the design of legal tests and adjustments made to the EAW system over time through the Court of Justice of the European Union affect the balance between fundamental rights protection and efficiency in the practical implementation of the EAW

    Fluorescent-Probe Characterization for Pore-Space Mapping with Single-Particle Tracking

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    Porous solids often contain complex pore networks with pores of various sizes. Tracking individual fluorescent probes as they diffuse through porous materials can be used to characterize pore networks at tens of nanometers resolution. However, understanding the motion behavior of fluorescent probes in confinement is crucial to reliably derive pore network properties. Here, we introduce well-defined lithography-made model pores developed to study probe behavior in confinement. We investigated the influence of probe-host interactions on diffusion and trapping of confined single-emitter quantum-dot probes. Using the pH-responsiveness of the probes, we were able to largely suppress trapping at the pore walls. This enabled us to define experimental conditions for mapping of the accessible pore space of a one-dimensional pore array as well as a real-life polymerization-catalyst-support particle

    Five-Year Outcomes of the SuperB Trial:A Multicenter Randomized Controlled Trial Comparing Heparin-Bonded Endograft to Surgical Femoropopliteal Bypass

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    Objective: This study aims to compare the 5-year outcomes of endoluminal bypass (EB) using heparin-bonded self-expanding covered stents versus bypass surgery for extensive femoropopliteal disease, including technical and clinical outcomes and health status. Background: The surgical femoropopliteal bypass was the gold standard to treat peripheral arterial disease (PAD) for decades; however, endovascular treatment modalities are now recommended for most femoropopliteal lesions. One-year data of a randomized controlled trial comparing EB with surgical bypass (SB) have shown a faster recovery, less morbidity, and comparable patency rates between the two techniques. To date, long-term randomized controlled data regarding both techniques are lacking. Methods: Five-year results of a multicenter randomized controlled trial comparing EB with SB in patients with femoropopliteal artery disease were evaluated based on intention-to-treat and per-protocol analyses. Results: At 5-year follow-up, primary, primary-assisted, and secondary patency rates were 36.2%, 52.4%, and 68.1% for EB and 49.4%, 72.2%, and 77.8% for SB, respectively (p=0.608). Freedom from target lesion revascularization (fTLR) was 34.1% for EB and 57.6% for SB (p=0.365). In both groups, the ankle-brachial index, Rutherford classification, and walking distance significantly improved compared with baseline without differences between groups at follow-up. Freedom from major amputation rate was 92.6% in the EB group and 96.2% in the SB group (p=0.361). The 36-Item Short-Form Health Survey showed no significant differences between groups. Conclusion: Treatment of extensive femoropopliteal disease with self-expanding covered stents provides comparable clinical-related and health-related questionnaire outcomes when compared with SB through 5 years of follow-up. However, the EB is related to a higher number of reinterventions. Clinical Impact: This present study is the first to report five-year outcomes comparing an endoluminal (EB) using heparin-bonded self-expanding covered stents with surgical bypass (SB) for long and complex femoropopliteal disease. Although the advantages of treatment with EB are mostly seen in the early period after treatment, the outcomes support the use of EB for this indication and seems to be a valid and safe alternative for bypass surgery. Future trials comparing various endovascular strategies may provide further guidance for the development of an evidence-based treatment algorithm.</p

    Water footprints and crop water use of 175 individual crops for 1990–2019 simulated with a global crop model

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    The water footprint of a crop (WF) is a common metric for assessing agricultural water consumption and productivity. To provide an update and methodological enhancement of existing WF datasets, we apply a global process-based crop model to quantify consumptive WFs of 175 individual crops at a 5 arcminute resolution over the 1990–2019 period. This model simulates the daily crop growth and vertical water balance considering local environmental conditions, crop characteristics, and farm management. We partition WFs into green (water from precipitation) and blue (from irrigation or capillary rise), and differentiate between rainfed and irrigated production systems. The outputs include gridded datasets and national averages for unit water footprints (expressed in m3 t−1 yr−1), water footprints of production (m3 yr−1), and crop water use (mm yr−1). We compare our estimates to other global studies covering different historical periods and methodological approaches. Provided outputs can offer insights into spatial and temporal patterns of agricultural water consumption and serve as inputs for further virtual water trade studies, life cycle and water footprint assessments

    Kinetics of Furfural Formation from Xylose via a Boronic Ester Intermediate

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    Previous studies showed that furfural can be made from lignocellulosic biomass with higher selectivity when the xylose is first converted to a boronic ester intermediate. So far, this has only been demonstrated on a laboratory scale with lab-grade reagents. This work aims to lay out the foundations needed for future development of an industrial process. Several parameters have been investigated, such as stirring rate, temperature, and choice of solvent and boronic acid. The reaction has also been validated for use with a real feedstock (i.e., bagasse acid hydrolysate). Additionally, a model has been developed for one combination of reagents, which predicts that at temperatures above 220 °C and a residence time below 400 s, furfural can be made from xylose via this route at more than 70% selectivity on a molar basis and 0.1 t/m3/h.</p


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