Author
M. S. Raghu Prasad
Bio: M. S. Raghu Prasad is an academic researcher from Indian Institute of Technology Madras. The author has contributed to research in topics: Haptic technology & Fitts's law. The author has an hindex of 5, co-authored 6 publications receiving 59 citations.
Papers
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TL;DR: In this article , Parasad et al. proposed to make the game more exciting by adding patterns and features on the bottom surface of the air hockey puck, which creates an asymmetry in the flow and generates pressure gradients along the pattern walls and a net unbalanced force is exerted on the puck throughout the game.
Abstract: AERODYNAMICALLY AUGMENTED AIR HOCKEY PUCKS – LATERAL AND ROTATIONAL MOTION FEBRUARY 2022 MADHUKAR PRASAD, B.S. VIT University M.S.M.E., UNIVERSITY OF MASSACHUSETTS AMHERST Directed by: Professor Jonathan P. Rothstein Air hockey is an interesting fast-paced arcade game which involves levitating a puck at a very small height from above the table allowing it to traverse seamlessly on a cushion of air and participants on either side of the table striking the puck with a handheld paddle. Over a period of time, the game becomes predictable and less challenging for a player with significant experience. Primary goal of this research is to make the game more exciting and we do this by naturally generating lateral and rotational aerodynamic forces on the puck by adding patterns and features on the bottom surface of the puck. This creates an asymmetry in the flow and generates pressure gradients along the pattern walls and a net unbalanced force is exerted on the puck throughout the game as long as air keeps flowing through the table. In this work, we provide a comprehensive study of numerical and experimental results for design-based optimizations that produce lateral and rotational motion with insights obtained from prior work.
31 Oct 2017
TL;DR: This study analyzes the impedance skills of residents and surgeons using custom developed novel bimanual laparoscopic skills trainer to explore the effects of experience on impedance based training.
Abstract: Laparoscopic surgery has widely replaced open surgery due to the advantages it has for patients both during surgery and post-surgery recovery. Due to inversion and remote access to the surgical site, haptics feedback is altered with laparoscopic surgical instruments [1]. This leads to excessive exertion of force [2]. Many intra operative errors like tissue injury in laparoscopic surgery are due to texertion of large forces [2]. Over the years, virtual reality (VR) based laparoscopic surgical simulators with haptics feedback have been instrumental in teaching basic and advanced laparoscopic skills to residents and surgeons [3]. However, a major limitation in modern day VR based simulator training systems is that they do not effectively teach the bimanual impedance-based laparoscopic skills. Past studies on VR based laparoscopic training have captured the skills sets of residents and surgeons using force and psychomotor metrics [3,4]. However, till date none have explored the effects of experience on impedance based training. In this study, we analyze the impedance skills of residents and surgeons using custom developed novel bimanual laparoscopic skills trainer.
TL;DR: In this paper , the authors provide a comprehensive study of numerical and experimental results for design-based optimizations that produce lateral and rotational motion with insights obtained from prior work and show that models with 38 mm outer radius exhibit an overall higher torque compared to models with 32 mm and 25 mm outer radii.
Abstract: Air hockey is an interesting fast-paced arcade game which involves levitating a puck at a very small height from above the table allowing it to traverse seamlessly on a cushion of air and participants on either side of the table striking the puck with a handheld paddle. Over a period of time, the game becomes predictable and less challenging for a player with significant experience. Primary goal of this research is to make the game more exciting and we do this by naturally generating lateral and rotational aerodynamic forces on the puck by adding patterns and features on the bottom surface of the puck. This creates an asymmetry in the flow and generates pressure gradients along the pattern walls and a net unbalanced force is exerted on the puck throughout the game as long as air keeps flowing through the table. In this work, we provide a comprehensive study of numerical and experimental results for design-based optimizations that produce lateral and rotational motion with insights obtained from prior work. Numerical simulations were performed on all 15 models and torque induced by these designs are plotted against the number of blades. Red indicate correlation of torque vs number of blades for models with mm as central region radius, represent models with 32 mm as central region radius and represent models with 25 mm as central region radius. Figure E clearly shows that models with 38 mm outer radius exhibit an overall higher torque compared to models with 32 mm and 25 mm outer radii. All 3 plots follow a similar increasing trend in torque as number of blades increases. This can be associated to blade extrusion angle b , as b reduces, component of force aiding in inducing torque increases while the component of force aiding towards lift force decreases. Torque generated was found to span between 3 10 -6 N-m to 12 10 -6 N-m which is large enough to rotate the puck in this frictionless situation.
Cited by
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TL;DR: Haptic feedback is added to virtual reality simulators to increase the fidelity and thereby improve training effect and force parameters and force feedback in box trainers have been shown to improve training results.
70 citations
26 Apr 2014
TL;DR: It is concluded that device bend gestures use their full potential when used to control continuous bipolar parameters, and when quick reactions are needed.
Abstract: Device deformation allows new types of gestures to be used in interaction. We identify that the gesture/use-case pairings proposed by interaction designers are often driven by factors relating improved tangibility, spatial directionality and strong metaphorical bonds. With this starting point, we argue that some of the designs may not make use of the full potential of deformation gestures as continuous, bipolar input techniques. In two user studies, we revisited the basics of deformation input by taking a new systematic look at the question of matching gestures with use cases. We observed comparable levels of UX when using bend input in different continuous bipolar interactions, irrespective of the choice of tangibility, directionality and metaphor. We concluded that device bend gestures use their full potential when used to control continuous bipolar parameters, and when quick reactions are needed. From our studies, we also identify relative strengths of absolute and relative mappings, and report a Fitts' law study for device bending input.
46 citations
TL;DR: The proposed trainer for online laparoscopic surgical skills assessment based on the performance of experts and nonexperts has the potential to increase the self-confidence of trainees and to be applied to programs with limited resources.
Abstract: Background. A trainer for online laparoscopic surgical skills assessment based on the performance of experts and nonexperts is presented. The system uses computer vision, augmented reality, and art...
31 citations
TL;DR: This paper reviews the current advances in needle insertion modeling, classified into three sections: needle insertion models, tissue deformation models, and needle–tissue interaction models.
Abstract: Needle insertion is the most basic skill in medical care, and training has to be imparted not only for physicians but also for nurses and paramedics In most needle insertion procedures, haptic feedback from the needle is the main stimulus in which novices need training For better patient safety, the classical methods of training the haptic skills have to be replaced with simulators based on new robotic and graphics technologies This paper reviews the current advances in needle insertion modeling, classified into three sections: needle insertion models, tissue deformation models, and needle–tissue interaction models Although understated in the literature, the classical and dynamic friction models, which are critical for needle insertion modeling, are also discussed The experimental setup or the needle simulators that have been developed to validate the models are described The need of psychophysics for needle simulators and psychophysical parameter analysis of human perception in needle insertion are discussed, which are completely ignored in the literature
30 citations
TL;DR: Modern day curriculum-based training should evaluate the skills of residents with robust force and psychomotor-based exercises for proficient laparoscopy and visual feedback on force and motion during training has the potential to enhance the learning curve of residents.
28 citations