Circular and elliptical motion are fundamental topics in physics education, yet learners often struggle to grasp them. We investigate how interactive qualitative representations can be used to describe the characteristic behavior of circular and elliptical motion. We use the vocabulary and algorithms known as qualitative reasoning, which make it possible to represent the distinct features of these systems in a conceptual way. Leveraging the close alignment between qualitative reasoning and human reasoning about dynamic systems, these representations have the potential to enhance understanding in this domain.
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.
The real-time simulation of human crowds has many applications. In a typical crowd simulation, each person ('agent') in the crowd moves towards a goal while adhering to local constraints. Many algorithms exist for specific local ‘steering’ tasks such as collision avoidance or group behavior. However, these do not easily extend to completely new types of behavior, such as circling around another agent or hiding behind an obstacle. They also tend to focus purely on an agent's velocity without explicitly controlling its orientation. This paper presents a novel sketch-based method for modelling and simulating many steering behaviors for agents in a crowd. Central to this is the concept of an interaction field (IF): a vector field that describes the velocities or orientations that agents should use around a given ‘source’ agent or obstacle. An IF can also change dynamically according to parameters, such as the walking speed of the source agent. IFs can be easily combined with other aspects of crowd simulation, such as collision avoidance. Using an implementation of IFs in a real-time crowd simulation framework, we demonstrate the capabilities of IFs in various scenarios. This includes game-like scenarios where the crowd responds to a user-controlled avatar. We also present an interactive tool that computes an IF based on input sketches. This IF editor lets users intuitively and quickly design new types of behavior, without the need for programming extra behavioral rules. We thoroughly evaluate the efficacy of the IF editor through a user study, which demonstrates that our method enables non-expert users to easily enrich any agent-based crowd simulation with new agent interactions.
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We propose to do an experimental study in which we will use 360 video and still photo simulations that portray varying levels of crowding. Simulations will be presented to 25 student participants and 25 older adult participants (65+; a lucrative tourist segment) in an experimental setting while signals of their emotional responses are recorded from their brain (EEG) and body (skin conductivity and heart rate) at our Experience Measurement Lab. A questionnaire will measure their intent to recommend and their willingness to pay for the ‘experiences’ (simulations) they have viewed. Analyses will determine optimal levels of crowding for the quality of the tourist experience, but also for income at the destination, accounting for the fact that a more crowded destination features more potential sources of income (visitors), but each a (possibly) different level of willingness to pay, including potential implications for local tourist taxes. Models will also account for possibly different processes in the two different age groups. Furthermore, modelling word-of-mouth/mouse marketing based on intent to recommend will also make it possible to predict how crowding affects demand long-term. Partner: KU Leuven.
Postdoc research project Transformation through Interactive Narrative DesignMedia psychologist dr. Christian Roth's postdoc project Transformation through Interactive Narrative Design (TIND) is part of the Professorship Performative Creative Processes, the school Games & Interaction, and the Expertisecentrum Onderzoek, Innovatie en Internationalisering (OOI). Here, Christian interweaves education and practice-oriented research. He studies the artistic, pedagogical and academic perspectives regarding the power of transformation through applied Interactive Narrative Design (IND).Within the two-year postdoc research project TIND, Christian studies the training of interactive narrative designers with the goal of developing teaching methods and learning tools for artists and designers, such as game and interaction designers, to enable them to create more effective artefacts.Why interactive narrative design?IND offers agency, defined as the ability to influence narrative progression and outcomes in a meaningful way. As such, it carries the potential to create and emotional impact and spark transformative change. This enables interactors to explore different points of view and to feel the weight of their own choices and consequences. This, in turn, allows for a more thorough understanding of complex multi-stakeholder issues, which could have a significant impact on the success of emerging artistic, and learning applications.The TIND project will enable designers through an interdisciplinary approach, including applied game design, immersive theatre, behavioral and cognitive psychology, and the learning sciences.A good example for offering different perspectives on a complex topic is the narrative simulation Mission Zhobia: Winning the Peace, which is used for the training of peacekeepers. Or the news game, I am Mosul, which aims to raise awareness around the effects of war by bringing it close to home: choose your Dutch city and make choices on how to survive if the war was there. And the interactive story Adventures with Anxiety offers a new understanding by letting interactors play anxiety embodied within a wolf. IND is a complex and challenging interdisciplinary field in which design knowledge from other media can often not be directly transferred. As a new medium, it introduces new affordances in technique and user experience. This requires practice-based research for further development of the educational format, demonstrating its potential while identifying and overcoming common learners’ challenges. This project aims to develop a framework for the design and evaluation of meaningful interactive narrative experiences that effectively stimulate a variety of cognitive and emotional responses such as reflection, insight, understanding, and potential behavior change. It provides tools, methods and activities to enable aspiring or practicing narrative designers through an interdisciplinary approach, including game design, immersive theatre, behavioral and cognitive psychology, and the learning sciences.HKU education means to prepare students for success in the creative industries and IND plays an important role for current and future jobs in education, arts and entertainment. IND has the potential to create an emotional impact and spark transformative change by offering agency, defined as the ability to influence narrative progression and outcomes in a meaningful way. This enables interactors to feel the weight of their own choices and their consequences, to explore different perspectives, and to more thoroughly understand complex multi-stakeholder issues, which could have significant impact on the success of emerging artistic, and learning applications.The planned output is a collection of design tools and methods for interdisciplinary workshops and courses, which can be integrated into different curricula at the HKU, thereby enhancing existing programs while enabling the refinement of training methods. Once completed, this postdoc project delivers a training method with multiple applications designed to harness the power of interactive storytelling for transformative personal and societal impact.ColloborationsThe research project is directly embedded in the curriculum of the HKU schoolGames & Interaction with annual educational offerings such as the Minor Interactive Narrative Design (MIND) and HKU wide broad seminars. Course evaluation and literature research will be used to create new and adjusted training for different HKU schools and the industry.More informationAre you interested to learn more about the postdoc research project Transformation through Interactive Narrative Design? Get in touch with Christian Roth: christian.roth@hku.nl
