Zhan Gao

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In this paper, we first propose an implicit surface to B-spline surface haptic interface, which provides both force and torque feedback. We then present a new haptic sculpting system for B-spline surfaces with shaped tools of implicit surface. In the physical world, people touch or sculpt with their fingers or tools, instead of just manipulating points.(More)
This paper describes a virtual reality (VR) simulator, for the purpose of education, training and prototyping of telemanipulation of carbon nanotubes. Major challenges in interfacing a human operator with tasks of manipulating nanotubes via a haptic VR interface are outlined. After a review of previous efforts, we present the current state of our VR(More)
This paper presents several experimental techniques and concepts in the process of measuring mechanical properties of very soft tissue in an ex vivo tensile test. Gravitational body force on very soft tissue causes pre-compression and results in a non-uniform initial deformation. The global digital image correlation technique is used to measure the(More)
—This paper presents a VR toolkit for path planning and manipulation of nanotube. The toolkit is capable of modeling the interactions between an AFM tip and carbon nanotubes on a substrate surface and generating optimum and safe manipulation paths. In addition, haptic guides were designed to help the user to follow the calculated paths, to avoid obstacles.
To improve the resource utilization and satisfy more users, a Greedy Double Auction Mechanism(GDAM) is proposed to allocate resources in grid environments. GDAM trades resources at discriminatory price instead of uniform price, reflecting the variance in requirements for profits and quantities. Moreover, GDAM applies different auction rules to different(More)
—A remote haptic collaboration system for lumbar puncture learning and training has been proposed. The study built a physical model for the simulation of interaction force between the needle and different tissues and developed a new protocol for real-time force feedback data transmission. Based on the processing delay and preprocessing interpolation, the(More)