Mechanical power output is a key performance-determining variable in many cyclic sports. In rowing, instantaneous power output is commonly determined as the dot product of handle force moment and oar angular velocity. The aim of this study was to show that this commonly used proxy is theoretically flawed and to provide an indication of the magnitude of the error. To obtain a consistent dataset, simulations were performed using a previously proposed forward dynamical model. Inputs were previously recorded rower kinematics and horizontal oar angle, at 20 and 32 strokes∙min−1. From simulation outputs, true power output and power output according to the common proxy were calculated. The error when using the common proxy was quantified as the difference between the average power output according to the proxy and the true average power output (P̅residual), and as the ratio of this difference to the true average power output (ratiores./rower). At stroke rate 20, P̅residual was 27.4 W and ratiores./rower was 0.143; at stroke rate 32, P̅residual was 44.3 W and ratiores./rower was 0.142. Power output in rowing appears to be underestimated when calculated according to the common proxy. Simulations suggest this error to be at least 10% of the true power output.
DOCUMENT
The security of online assessments is a major concern due to widespread cheating. One common form of cheating is impersonation, where students invite unauthorized persons to take assessments on their behalf. Several techniques exist to handle impersonation. Some researchers recommend use of integrity policy, but communicating the policy effectively to the students is a challenge. Others propose authentication methods like, password and fingerprint; they offer initial authentication but are vulnerable thereafter. Face recognition offers post-login authentication but necessitates additional hardware. Keystroke Dynamics (KD) has been used to provide post-login authentication without any additional hardware, but its use is limited to subjective assessment. In this work, we address impersonation in assessments with Multiple Choice Questions (MCQ). Our approach combines two key strategies: reinforcement of integrity policy for prevention, and keystroke-based random authentication for detection of impersonation. To the best of our knowledge, it is the first attempt to use keystroke dynamics for post-login authentication in the context of MCQ. We improve an online quiz tool for the data collection suited to our needs and use feature engineering to address the challenge of high-dimensional keystroke datasets. Using machine learning classifiers, we identify the best-performing model for authenticating the students. The results indicate that the highest accuracy (83%) is achieved by the Isolation Forest classifier. Furthermore, to validate the results, the approach is applied to Carnegie Mellon University (CMU) benchmark dataset, thereby achieving an improved accuracy of 94%. Though we also used mouse dynamics for authentication, but its subpar performance leads us to not consider it for our approach.
DOCUMENT
Background: Shared decision-making is one key element of interprofessional collaboration. Communication is often considered to be the main reason for inefficient or ineffective collaboration. Little is known about group dynamics in the process of shared decision-making in a team with professionals, including the patient or their parent. This study aimed to evaluate just that. Methods: Simulation-based training was provided for groups of medical and allied health profession students from universities across the globe. In an overt ethnographic research design, passive observations were made to ensure careful observations and accurate reporting. The training offered the context to directly experience the behaviors and interactions of a group of people. Results: Overall, 39 different goals were defined in different orders of prioritizing and with different time frames or intervention ideas. Shared decision-making was lacking, and groups chose to convince the parents when a conflict arose. Group dynamics made parents verbally agree with professionals, although their non-verbal communication was not in congruence with that. Conclusions: The outcome and goalsetting of an interprofessional meeting are highly influenced by group dynamics. The vision, structure, process, and results of the meeting are affected by multiple inter- or intrapersonal factors.
DOCUMENT
An important performance determinant in wheelchair sports is the power exchanged between the athletewheelchair combination and the environment, in short, mechanical power. Inertial measurement units (IMUs) might be used to estimate the exchanged mechanical power during wheelchair sports practice. However, to validly apply IMUs for mechanical power assessment in wheelchair sports, a well-founded and unambiguous theoretical framework is required that follows the dynamics of manual wheelchair propulsion. Therefore, this research has two goals. First, to present a theoretical framework that supports the use of IMUs to estimate power output via power balance equations. Second, to demonstrate the use of the IMU-based power estimates during wheelchair propulsion based on experimental data. Mechanical power during straight-line wheelchair propulsion on a treadmill was estimated using a wheel mounted IMU and was subsequently compared to optical motion capture data serving as a reference. IMU-based power was calculated from rolling resistance (estimated from drag tests) and change in kinetic energy (estimated using wheelchair velocity and wheelchair acceleration). The results reveal no significant difference between reference power values and the proposed IMU-based power (1.8% mean difference, N.S.). As the estimated rolling resistance shows a 0.9–1.7% underestimation, over time, IMU-based power will be slightly underestimated as well. To conclude, the theoretical framework and the resulting IMU model seems to provide acceptable estimates of mechanical power during straight-line wheelchair propulsion in wheelchair (sports) practice, and it is an important first step towards feasible power estimations in all wheelchair sports situations.
DOCUMENT
Emotions embody the value in tourism experiences and drive essential outcomes such as intent to recommend. Current models do not explain how the ebb and flow of emotional arousal during an experience relate to outcomes, however. We analyzed 15 participants’ experiences at the Vincentre museum and guided village tour in Nuenen, the Netherlands. This Vincent van Gogh-themed experience led to a wide range of intent to recommend and emotional arousal, measured as continuous phasic skin conductance, across participants and exhibits. Mixed-effects analyses modeled emotional arousal as a function of proximity to exhibits and intent to recommend. Experiences with the best outcomes featured moments of both high and low emotional arousal, not one continuous “high,” with more emotion during the middle of the experience. Tourist experience models should account for a complex relationship between emotions experienced and outcomes such as intent to recommend. Simply put, more emotion is not always better.
DOCUMENT
Public transgressions by group members threaten the public image of a group when outside observers perceive them as representative of the group in general. In three studies, we tested the effectiveness of rejection of a deviant group member who made a racist comment in public, and compared this to several other strategies the group could employ to protect their image. In Study 1 (N¼75) and Study 2 (N¼51), the group was judged less racist after rejecting the deviant than after claiming a non-racist position or not responding to the transgression. Perceived typicality of the deviant partially mediated this effect in Study 2. In Study 3 (N¼81), the group was judged least racist after forcing the deviant to apologize and as most racist after denying the severity of the transgression. Results also showed a negative side-effect of rejection. Perceived exclusion of the deviant contributed to a perception of the group as disloyal to its members, which resulted in a less favorable overall group evaluation. Potential benefits and risks of rejection, denial, and apologies are further discussed in the General Discussion.
DOCUMENT
Het onderzoek dat ten grondslag ligt aan dit artikel onderzoekt hoe de overheid markten reguleert voor (financiële) producten en diensten teneinde falen van de markt te voorkomen. Het behandelt specifiek EU Richtlijn 2014/57/EU betreffende strafrechtelijke sancties voor marktmisbruik en de implementatie daarvan in Nederland en opvolgend gebruik door het Openbaar Ministerie en Autoriteit Financiële Markten en hun Convenant ter voorkoming van ongeoorloofde samenloop van bestuurlijke en strafrechtelijke sancties. Het beantwoord de vraag of deze richtlijn de ontwikkeling van effectief reguleren van de financiële markt bevordert of remt. De slotsom ten aanzien van de implementatie van Richtlijn 2014/57/EU is – kort gezegd – dat “slechts” het aantal jaren gevangenisstraf voor handel met voorkennis en marktmisbruik van twee naar vier aangepast dient te worden. Het artikel concludeert tenslotte dat de huidige praktijk van het Convenant tussen OM en Autoriteit Financiële Markten kan blijven bestaan. De Autoriteit Financiële Markten kan haar inspanningen om haar toezicht verder in de geest van responsive regulation te verbeteren ongestoord door het OM voortzetten.
DOCUMENT
Blog post where the author speaks about his recently published article "Adherence to an injury prevention program in male amateur football players is affected by players’ age, experience and perceptions"
LINK
On 13 June 2018, Susana Menéndez said farewell as member of the Executive Board of The Hague University of Applied Sciences. To mark that occasion, a symposium was held on leadership in the internationalization of higher education, of which Susana has been a champion over the past ten years.
DOCUMENT
Despite the notable strides that have been made in terms of participation in sport, women continue to be underrepresented in sport leadership roles such as coaching and officiating. The 2014 United Nations (UN) International Working Group on Women’s Sport (IWG) noted that: ‘Women are significantly under-represented in management, administration, coaching and officiating, particularly at the higher levels’ (IWG, 2014 p. 6). This statement, part of the Helsinki Declaration, was made in the context of how sport can support the UN Millennium Development Goals. Across today’s sporting landscape, women’s sport experiences typically occur in male-dominated contexts, which favour men and masculinity (Norman, 2016). Recent data indicates the men to women ratio in high-performance coaching over the last four consecutive Olympic cycles has been approximately 10:1. Among US high school sporting officials, only 11% are women, and even a greater disparity exists with officiating sports traditionally played by men (Nordstrom, Warner, & Barnes, 2016). This data highlights a systemic absence of women in coaching and officiating leadership roles across sport. In this chapter we will discuss the impact this has on developing sport for women and girls. Specifically, this chapter aims to: - Provide an understanding of the roles and responsibilities of coaches and officials in women and girls sport delivery. - Explore career development pathways for improving opportunities for women in coaching and officiating. - Present a critical reflection of the differences and similarities between athlete development and coach/official development (systems and structures) for women and girls. We begin by discussing the gendered nature of coaching before turning our attention to women’s experiences in sport officiating. We draw on relevant literature throughout the chapter and identify issues and opportunities for further research. We conclude by providing practical actions and recommendations to help facilitate coaching and officiating development for women and girls LinkedIn: https://www.linkedin.com/in/donna-de-haan/
MULTIFILE
