2012, Part of book or chapter of book (Operations Management Research and Cellular Manufacturing Systems: Innovative Methods and Approaches, pp. Chapter 2)
2021, Article / Letter to editor (Journal of Human Nutrition and Dietetics, (2021))Background Surrogate decision-making regarding oral nutritional supplements (ONS) for nursing home residents with advanced dementia is a complex process. In this cross-sectional study, we assessed whether Dutch dietitians, elderly care physicians (physicians) and surrogate decision-makers (SDMs) differ in the factors that they regard important when considering ONS. We also investigated differences in opinion regarding whether or not ONS is a life-prolonging measure. Methods Through an online survey, 90 dietitians, 53 physicians and 70 SDMs of nursing home residents (all aged >= 65 years old with advanced dementia) rated the level of perceived influence of 11 pre-defined factors on their decision-making, ranked factors in order of importance and stated whether they considered ONS a life-prolonging measure or not. By statistical analysis, we tested differences in the mean sum of ranks for perceived influence differing between groups. We also tested differences in proportions between groups of those who considered ONS a life-prolonging measure. Results Rating of perceived influence significantly differed for six factors. Quality of life was ranked as the most influential factor by all groups. Dietitians significantly differed in their opinion on the life-prolonging effect of ONS from physicians (odds ratio = 0.29, 95% confidence interval = 0.13-0.65), as well as from SDMs (odds ratio = 0.22, 95% confidence interval = 0.10-0.45). Conclusions Although all groups proclaimed quality of life to be first priority in decision-making, we found that Dutch dietitians, physicians and SDMs differed in what they regarded important when considering ONS for nursing home residents with advanced dementia. Regarding the life-prolonging effect of ONS, dietitians differed in opinion from physicians, as well as from SDMs.
2010, Article / Letter to editor (Critical Care, vol. 7, iss. 6, (2010), pp. 12-15)Bij patiënten die gereanimeerd zijn, wordt standaard gecontroleerde, milde hypothermie (streeftemperatuur 32-34oC) toegepast bij om verdere hersenschade te beperken. Het koelen gaat gepaard met perifere vasoconstrictie waardoor de huid en de subcutis minder doorbloed zijn. Onderzocht is of de beperkte doorbloeding – in combinatie met een verminderde toepassing van wisselhouding in verband met het beoogd waarborgen van de hemodynamiek – leidt tot meer decubitius en wat eraan gedaan kan worden.
2010, Article / Letter to editor (Journal of Medical Internet Research, vol. 12, iss. 2, (2010), pp. e18)During the last decade, the Internet has become increasingly popular and is now an important part of our daily life. When new "Web 2.0" technologies are used in health care, the terms "Health 2.0" or "Medicine 2.0" may be used. The objective was to identify unique definitions of Health 2.0/Medicine 2.0 and recurrent topics within the definitions. A systematic literature review of electronic databases (PubMed, Scopus, CINAHL) and gray literature on the Internet using the search engines Google, Bing, and Yahoo was performed to find unique definitions of Health 2.0/Medicine 2.0. We assessed all literature, extracted unique definitions, and selected recurrent topics by using the constant comparison method.
2010, Article / Letter to editor (Critical Care, vol. 2010, iss. 14, (2010), pp. 449)It may be true (but confirmation is required) that adding delirium to a measurement such as the APACHE score is not of value. Clinicians and hospital quality officers should continue to consider early detection of delirium and ongoing delirium detection as an important prognostic tool. Despite shortcomings of various methods to determine the predictive value, our conclusion remains that delirium does not improve the predictive value of the APACHE score.
2012, Article / Letter to editor (Critical Care Medicine, vol. 2012, iss. 40, (2012), pp. 112-119)Prospective 18-month follow-up study to examine the impact of delirium during intensive care unit stay on long-term health-related quality of life and cognitive function in intensive care unit survivors.
2012, Article / Letter to editor (Journal Vehicle System Dynamics, vol. 50, iss. 6, (2012), pp. 939-959)Path tracking driver models assume the observed path deviation ahead of the vehicle to be proportionally transferred to a corrective steering input. The most simple version of such a model includes three parameters, a single preview distance, a steering gain and a delay time, being examined in this paper, in dependency of vehicle properties, driver characteristics, velocity and path. It is shown that, for different and bounded preview lengths, a driver can follow any path with almost the same minimum path error, if the gain is adapted appropriately. The upper boundary is path-dependent but driver and path characteristics have only a minor effect on the resulting relationship between preview length and gain. Consequently, gain and preview length may well vary along some path. This has been examined, experimentally, for different drivers. A too small preview length conflicts with closed-loop stability, explicitly described in terms of vehicle parameters, vehicle speed and driver delay time. The results of this paper provide a basis for enhanced understanding of human driver behaviour.
2012, Article / Letter to editor (Acta Horticulturae, iss. 952, (2012), pp. 523)In this paper the design and development of a new type of greenhouse with an integrated filter for reflecting near infrared radiation (NIR) and a solar energy delivery system is described. Especially the optical parts as the spectral selective film, the properties of the circular reflector and the efficiencies of photo voltaic cells are studied. As a first measure, the spectral selective cover material, which prevents the entrance of NIR radiation, is investigated. It has to block up to 35% of the solar energy outside the greenhouse, which will reduce the needed cooling capacity. The second measure is the integration with a solar energy system. When the NIR reflecting coating is designed as a circular shaped reflector integrated in the greenhouse, the reflected solar energy of a PhotoVoltaic (PV) cell in the focus point delivers electric energy. With a ray tracing computer program the optimal geometry of the reflector was designed with respect to the collecting efficiency. The PV cells mounted in the focal point require cooling due to the high heat load of the concentrated radiation (geometric concentration factor of 30). The properties of different PV materials were investigated to find the optimal cell for this application. Cooled greenhouses are an important issue to cope with the combination of high global radiation and high outdoor temperatures. All parts are integrated in a 100m2 prototype greenhouse which will be applied for the proof of principle.
2009, Article / Letter to editor (Acta Horticulturae, iss. 807, (2009), pp. 47-53)In this paper the design and development of a new type of greenhouse with an integrated filter for reflecting near infrared radiation (NIR) and a solar energy delivery system is described. Especially the optical parts as the spectral selective film, the properties of the circular reflector and the efficiencies of photo voltaic cells are studied. As a first measure, the spectral selective cover material, which prevents the entrance of NIR radiation, is investigated. It has to block up to 35% of the solar energy outside the greenhouse, which will reduce the needed cooling capacity. The second measure is the integration with a solar energy system. When the NIR reflecting coating is designed as a circular shaped reflector integrated in the greenhouse, the reflected solar energy of a PhotoVoltaic (PV) cell in the focus point delivers electric energy. With a ray tracing computer program the optimal geometry of the reflector was designed with respect to the collecting efficiency. The PV cells mounted in the focal point require cooling due to the high heat load of the concentrated radiation (geometric concentration factor of 30). The properties of different PV materials were investigated to find the optimal cell for this application. Cooled greenhouses are an important issue to cope with the combination of high global radiation and high outdoor temperatures. All parts are integrated in a 100m2 prototype greenhouse which will be applied for the proof of principle.
2014, Article in monograph or in proceedings (NordiCHI'14)In this paper we discuss mixed-method research in HCI. We report on an empirical literature study of the NordiCHI 2012 proceedings which aimed to uncover and describe common mixed-method approaches, and to identify good practices for mixed-methods research in HCI. We present our results as mixed-method research design patterns, which can be used to design, discuss and evaluate mixed-method research. Three dominant patterns are identified and fully described and three additional pattern candidates are proposed. With our pattern descriptions we aim to lay a foundation for a more thoughtful application of, and a stronger discourse about, mixed-method approaches in HCI.
2021, Article in monograph or in proceedings (Soares, M.M.; Rosenzweig, E.; Marcus, A. (ed.), Design, User Experience, and Usability: Design for Diversity, Well-being, and Social Development, pp. 373-386)
2016, Article in monograph or in proceedings (workshop)une 2013 issue of IEEE Transactions on Professional Communication features a special section on 'Designing a Better User Experience for Self-Service Systems'. Self-service systems offers the users the benefit of 24/7 access to an ever-growing range of services and perhaps also a strong sense of autonomy and fulfillment. Three papers in this section approach the design of the user experience of self-service systems in an integrated way and show the readership of this journal what methods and techniques can be used in this type of design process. These are, 'Identifying User Experience Factors for Mobile Incident Reporting in Urban Contexts,' by Bach, Bernhaupt, and Winckler, 'Improving User Experience for Passenger Information Systems. Prototypes and Reference Objects,' by Wirtz and Jakobs, and in 'A User-Centered Design Approach to Self-Service Ticket Vending Machines,' by Siebenhandl, Schreder, Smuc, Mayr, and Nagl.
2016, Article / Letter to editor (BMJ Open, vol. 6, iss. 11, (2016))Objectives: To identify determinants of the initial employment of physician assistants (PAs) for inpatient care as well as of the sustainability of their employment. Design: We conducted a qualitative study with semistructured interviews with care providers. Interviews continued until data saturation was achieved. All interviews were transcribed verbatim. A framework approach was used for data analysis. Codes were sorted by the themes, bringing similar concepts together. Setting: This study was conducted between June 2014 and May 2015 within 11 different hospital wards in the Netherlands. The wards varied in medical speciality, as well as in hospital type and the organisational model for inpatient care. Participants: Participant included staff physicians, residents, PAs and nurses. Results: The following themes emerged to be important for the initial employment of PAs and the sustainability of their employment: the innovation, individual factors, professional interactions, incentives and resources, capacity for organisational change and social, political and legal factors. Conclusions: 10 years after the introduction of PAs, there was little discussion among the adopters about the added value of PAs, but organisational and financial uncertainties played an important role in the decision to employ and continue employment of PAs. Barriers to employ and continue PA employment were mostly a consequence of locally arranged restrictions by hospital management and staff physicians, as barriers regarding national laws, PA education and competencies seemed absent.
2012, Article in monograph or in proceedings (Emerging Topics in the Practice of Enterprise Modeling)In this paper, we describe our study on the relation between formation of abstractions and aspects of executive control in the context of process modeling. We have observed and recorded three business process
modeling projects in different companies. We report on the findings resulting from the analysis of the first project. We find evidence that certain traits related to high-quality abstraction formation contribute to more structured modeling performance. Through our analysis we gain more insight in the cognitive mechanisms involved in modeling, which provides us with another step towards design of effective modeling support.
2016, Article / Letter to editor (Lecture Notes in Computer Science, vol. 9737, (2016), pp. 109-119)Smart wearable devices are integrated our everyday lives. Such wearable technology is worn on or near the body, while leaving both hands free. This enables users to receive and send information in a non-obtrusive way. Because of the ability to continuously assist and support activities, wearables could be of great value to persons with a disability. Persons with a disability can only benefit from the potential of wearables if they are accessible. Like other devices, platforms, and applications, developers of wearables need to take accessibility into account during early development, for example by including multimodal interfaces in the design. Even though some accessibility guidelines and standards exist for websites and mobile phones, more support for the development of accessible wearables is needed. The aim of our project is to develop a set of guidelines for accessible wearables. Three approaches are combined to develop the guidelines. A scan of the literature was done to identify publications addressing the accessibility of wearables and/or development guidelines. Semi-structured interviews were held with developers of accessible wearable technology. Based on these first activities, a draft set of guidelines is created. This draft is evaluated with developers and researchers in the field of universal design, accessibility, and wearables. Further, the draft is evaluated with visually impaired people (VIP) in interviews. Based on these results, a final set of guidelines will be created. This set is evaluated against an actual project in which apps are developed for VIP. This study is in progress; first results are presented (literature study, semi-structured interviews, first draft of guidelines) and a call for participation in the Delphi study is issued
2015, Article / Letter to editor (Human Resource Development Quarterly, vol. 3, iss. 1, (2015))The aims of this article are to (a) examine the prevalence of HR (HRM and HRD) practices to retain older workers in health care organizations; (b) evaluate those HR practices that are specifically designed to facilitate the retention of older workers; and (c) classify those HR practices against the needs of older workers, line managers, and HR professionals. To achieve these aims, 51 interviews were conducted with older workers, line managers, and HR professionals working in 15 Dutch hospitals and care service organizations in late 2010. The study had a mixed-methods setup in that the collected information was partly quantitative (figures about the prevalence and outcomes of practices), and partly qualitative (incorporating illustrative reflections or observations offered by interviewees), the latter complementing the former. Maintenance HR practices (practices that are focused on retaining older workers in their current jobs) appeared to be by far more prevalent compared to development HR practices (practices that are focused on advancement, growth and accomplishment, and that encourage individual workers to achieve new and challenging levels of functioning). In general, both types of HR practices were evaluated as successful by older workers, line managers, and HR professionals. Unexpectedly, the successful evaluations of the maintenance practices appeared to be attributed to developmental rather than maintenance processes. Furthermore, the needs of older workers appeared to be strongly related to both development practices and, although to a lesser degree, maintenance practices. The article concludes with relevant directions for future research.
2015, Article / Letter to editor (Human Resource Development Quarterly, vol. 26, iss. 1, (2015), pp. 53-80)The aims of this article are to (a) examine the prevalence of HR (HRM and HRD) practices to retain older workers in health care organizations; (b) evaluate those HR practices that are specifically designed to facilitate the retention of older workers; and (c) classify those HR practices against the needs of older workers, line managers, and HR professionals. To achieve these aims, 51 interviews were conducted with older workers, line managers, and HR professionals working in 15 Dutch hospitals and care service organizations in late 2010. The study had a mixed-methods setup in that the collected information was partly quantitative (figures about the prevalence and outcomes of practices), and partly qualitative (incorporating illustrative reflections or observations offered by interviewees), the latter complementing the former. Maintenance HR practices (practices that are focused on retaining older workers in their current jobs) appeared to be by far more prevalent compared to development HR practices (practices that are focused on advancement, growth and accomplishment, and that encourage individual workers to achieve new and challenging levels of functioning). In general, both types of HR practices were evaluated as successful by older workers, line managers, and HR professionals. Unexpectedly, the successful evaluations of the maintenance practices appeared to be attributed to developmental rather than maintenance processes. Furthermore, the needs of older workers appeared to be strongly related to both development practices and, although to a lesser degree, maintenance practices. The article concludes with relevant directions for future research.
2022, Article / Letter to editor (BMC Musculoskeletal Disorders, (2022))Background
While low back pain occurs in nearly everybody and is the leading cause of disability worldwide, we lack instruments to accurately predict persistence of acute low back pain. We aimed to develop and internally validate a machine learning model predicting non-recovery in acute low back pain and to compare this with current practice and ‘traditional’ prediction modeling.
Methods
Prognostic cohort-study in primary care physiotherapy. Patients (n = 247) with acute low back pain (≤ one month) consulting physiotherapists were included. Candidate predictors were assessed by questionnaire at baseline and (to capture early recovery) after one and two weeks. Primary outcome was non-recovery after three months, defined as at least mild pain (Numeric Rating Scale > 2/10). Machine learning models to predict non-recovery were developed and internally validated, and compared with two current practices in physiotherapy (STarT Back tool and physiotherapists’ expectation) and ‘traditional’ logistic regression analysis.
Results
Forty-seven percent of the participants did not recover at three months. The best performing machine learning model showed acceptable predictive performance (area under the curve: 0.66). Although this was no better than a’traditional’ logistic regression model, it outperformed current practice.
Conclusions
We developed two prognostic models containing partially different predictors, with acceptable performance for predicting (non-)recovery in patients with acute LBP, which was better than current practice. Our prognostic models have the potential of integration in a clinical decision support system to facilitate data-driven, personalized treatment of acute low back pain, but needs external validation first.
2014, Article / Letter to editor (Journal of Occupational Rehabilitation, vol. 24, iss. 2, (2014), pp. 268-277)OBJECTIVE: To develop a Dutch version of the Stanford Presenteeism Scale (SPS-6) and examine the reliability and discriminant, discriminative and structural validity of the Dutch SPS-6 (DSPS-6). METHODS: The original SPS-6 (English-language) was translated and adapted to the Dutch culture. Thirty participants filled in the DSPS-6 at baseline (T0) and after 5 days (T1). Internal consistency (Cronbach's alpha), test-retest reliability (Spearman's correlation coefficient, Spearman's rho), item-to-total correlations, discriminant validity (association with job stress and job satisfaction), discriminative validity (patients reporting a (work) disability compared with those indicating that they had no disability; Spearman's rho, t tests), structural validity (Varimax rotation with Kaiser Normalization) and floor and ceiling effects were examined. RESULTS: Cronbach's alpha for the DSPS-6 was 0.89. Test-retest Spearman's rho was 0.82 (p < 0.01). Item-to-total correlations ranged from 0.60 to 0.82. Subjects reporting a work disability had significantly lower DSPS scores (discriminative validity). Spearman's rho for the DSPS-6 score and job satisfaction were 0.38 (p = 0.05; at T0) and 0.27 (at T1), respectively. Spearman's rho for the association between the DSPS-6 and job stress were -0.52 (p = 0.01; at T0) and -0.42 (p = 0.05; at T1), respectively (discriminant validity). The two factors derived from the principal components analysis account for 77.5 % of the variance of responses (structural validity). A ceiling effect was present. CONCLUSIONS: The DSPS-6 showed good reliability and structural validity. The discriminative validity of the DSPS-6 is partly supported. The concept of presenteeism is not sufficiently distinct from the constructs of job stress and job satisfaction (discriminant validity). The results of the present study show that the adaptation of the SPS-6 into Dutch was successful. Further research on the reliability, validity and responsiveness of the DSPS-6 in a larger group of participants is recommended.