Browsing by Author "Bhattacharya, Karina"
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Item Body-Powered Prosthesis Design for a Patient with a Partial Hand Amputation(2022-04-14) Bhattacharya, Karina3D-printing technology allows designers to create customizable and functional prosthetics for amputee patients in need. This study explored the creation of 3D-printed prosthetic fingers that were specifically designed for a patient with a partial hand amputation. Since the patient’s remaining hand maintained a high degree of strength and wide range of motion, a body-powered prosthetic could enable the patient to move the prosthetic fingers with the rest of their hand. On-site visits with the patient and occupational therapist helped establish technical information such as finger measurements and current range of movement, details that were later used to design the prosthesis. The final design aimed to achieve basic grasps, appear near life-like, and be comfortably worn on the hand. 14 prototype iterations and physical models were 3D-printed and tested for durability and functionality. The final design of the prosthesis incorporated a four-bar linkage mechanism system that closed the fingers by flexing the back of the hand. It tailored to the specific needs of the patient and offered them the ability to perform basic functions such holding, grasping, and writing.Item Reducing Disorientation in Teleportation: Improving Navigation in Virtual Reality(2020-09-29) Bhattacharya, Karina; Walton, Nina Crosby; Shroff, VrindaPhysically walking and turning within a virtual environment (VE) is the most natural way to navigate in virtual reality (VR), although the VE often exceeds the physical limitations of the tracked space. As a result, teleportation, in which the user is immediately transported to a selected location, is a common navigation interface that allows users to explore large VEs. An additional benefit of teleportation is that users tend to experience less cybersickness since visual motion is typically absent (Akiduki et al., 2003). One drawback of teleportation is the tendency to disorient users, as the lack of self-motion cues may result in the loss of spatial awareness. The objective of the current study is to investigate ways to improve the use of teleportation within VR in order to decrease the effect of disorientation. The current study will collect data from users participating in partially concordant and discordant navigation tasks to determine whether taking the perspective of an avatar mitigates the effects of disorientation in teleportation. The results of this study may inform developers of ways to improve teleportation interfaces for use in advanced spatial training and VR gaming experiences. This project was completed with contributions from Jonathan Kelly, Stephen Gilbert, Lucia Cherep, and Alec Ostrander from Iowa State University.