Yuen Law

• Dr. rer. nat.
• Lecturer Professor at Instituto Tecnológico de Costa Rica

Cybersickness poses a significant barrier to the widespread adoption of VR applications, particularly when virtual movement occurs without corresponding physical movement. While current strategies to mitigate cybersickness exist, none are entirely effective, especially if virtual movement is essential. Further research is needed, and this requires...

This paper introduces ChronoShore, an immersive virtual reality (VR) experience designed to explore diegetic time manipulation mechanics within a semi-realistic coastal environment. Traditional 2D video scrubbing methods fall short in immersive settings, particularly for understanding time-bound processes such as simulations of geology or biology....

We propose the use of a Virtual Tour to substitute in-person visits to a manufacturing plant for a lecture on Enterprise Productivity at the School of Business Administration at our University. Traditionally, during this lecture, students are required to visit a production site to observe its process and apply their knowledge in a real-life scenari...

This paper analyses changes in some items of the User Experience Questionnaire (UEQ) for use in the context of Costa Rican culture. Although a Spanish version of the UEQ was created in 2012, we use a double-translation and reconciliation model for detecting the more appropriate words for Costa Rican culture. These resulted in 7 new items that were...

Gathering qualitative user data in a user-centered design process is one of the very early steps to create interactive systems. However, generating structured models from qualitative data towards descriptions that can be used for the implementation of interactive systems and prototypes raises various challenges, such as a strong influence of the mo...

Although habits are a well-researched topic within psychology, habits enacted at the workplace received limited attention in the organizational literature. In this article we examine habits that employees show at the workplace. Because workplace habits are not always functional for performance or affective outcomes, and because employees themselves...

Leaning (the upper body) has several times been shown to be a suitable virtual travel technique when being seated; in both, flying as well as ground-based scenarios. The direction of the steering method most commonly used is gaze/head-directed. However, this does not allow to inspect the environment independently from the direction of movement. The...

Habitual behavior at work can be beneficial because it allows people to perform their tasks more automatically and with less cognitive load. On the downside, habitual work behavior can foster inefficient work strategies as it is executed with lower levels of awareness and relatively rigidly. We propose the development of an interactive system that...

In the simulation of multi-component systems, we often encounter a problem with a lack of ground-truth data. This situation makes the validation of our simulation methods and models a difficult task. In this work we present a guideline to design validation methodologies that can be applied to the validation of multi-component simulations that lack...

In contrast to the wide-spread use of 6-DOF pointing devices, free-hand user interfaces in Immersive Virtual Environments (IVE) are non-intrusive. However, for gesture interfaces, the definition of trigger signals is challenging. The use of mechanical devices, dedicated trigger gestures, or speech recognition are often used options, but each comes...

Making music by blowing on bottles is fun but challenging. We introduce a novel 3D user interface to play songs on virtual bottles. For this purpose the user blows into a microphone and the stream of air is recreated in the virtual environment and redirected to virtual bottles she is pointing to with her fingers. This is easy to learn and subsequen...

When learning ultrasound (US) imaging, trainees must learn how to recognize structures, interpret textures and shapes, and simultaneously register the 2D ultrasound images to their 3D anatomical mental models. Alleviating the cognitive load imposed by these tasks should free the cognitive resources and thereby improve the learning process. We argue...

Successful bone sawing requires a high level of skill and experience, which could be gained by the use of Virtual Reality-based simulators. A key aspect of these medical simulators is realistic force feedback. The aim of this paper is to model the bone sawing process in order to develop a valid training simulator for the bilateral sagittal split os...

Computer-assisted processing and interpretation of medical ultrasound images is one of the most challenging tasks within image analysis. Physical phenomena in ultrasonographic images, e.g., the characteristic speckle noise and shadowing effects, make the majority of standard methods from image analysis non optimal. Furthermore, validation of adapte...

In this paper we present a haptic rendering algorithm for simulating the interaction of two independently controlled rigid objects with each other and a rigid environment. Our penalty based approach is based on a linearization model of occurring forces, and employs, for the computation of object positions and orientations, an iterative trust-region...

Brightness modulation (B-Mode) ultrasound (US) images are used to visualize internal body structures during diagnostic and invasive procedures, such as needle insertion for Regional Anesthesia. Due to patient availability and health risks-during invasive procedures-training is often limited, thus, medical training simulators become a viable solutio...

In this paper, we present the results of a user study with a bimanual haptic setup. The goal of the experiment was to evaluate if Guiard's theory of the bimanual frame of reference can be applied to interaction tasks in virtual environments (VE) with haptic rendering. This theory proposes an influence of the non-dominant hand (NDH) on the dominant...

In this poster we describe a prototype of a product designed for special education in developing a country (Costa Rica). This prototype allows parents and instructors to build dynamics to exercise the fine motor skills and learn syllables, colors and shapes. The device can be constructed using blueprints with reused and low-cost materials. It is an...

Medical simulators are gaining importance because the experience and skills necessary to perform many of the medical procedures are difficult to obtain due to patient safety and ethical issues. With the development of graphic cards, stereographic and haptic devices, more VR-based simulators are being created. We are developing an interactive ul-tra...