Effects of Image Size and Structural Complexity on Time and Precision of Hand Movements in Head Mounted Virtual Reality

Abstract: The effective design of virtual reality (VR) simulators requires a deeper understanding of VR mediated human actions such as hand movements, with specifically tailored experiments testing how different design parameters affect performance. The present experiment investigates the time and precision of hand (index finger) movements under varying conditions of structural complexity and image sizeContinue reading “Effects of Image Size and Structural Complexity on Time and Precision of Hand Movements in Head Mounted Virtual Reality”

Seeing virtual while acting real: Visual display and strategy effects on the time and precision of eye-hand coordination

Abstract: Effects of different visual displays on the time and precision of bare-handed or tool-mediated eye-hand coordination were investigated in a pick-and-place-task with complete novices. All of them scored well above average in spatial perspective taking ability and performed the task with their dominant hand. Two groups of novices, four men and four women inContinue reading “Seeing virtual while acting real: Visual display and strategy effects on the time and precision of eye-hand coordination”

Novice and Expert Haptic Behaviours While Using a Robot Controlled Surgery System

Abstract: STRAS (Single access Transluminal Robotic Assistant for Surgeons) is a flexible robotic system based on the Anubis® platform of Karl Storz for application to intraluminal procedures. It consists of three cable-driven systems, one endoscope serving as guide and two inserted instruments. The flexible and bendable instruments have three degrees of freedom and can be teleoperatedContinue reading “Novice and Expert Haptic Behaviours While Using a Robot Controlled Surgery System”

Effects of 2D and 3D image views on hand movement trajectories in the surgeon’s peri-personal space in a computer controlled simulator environment

Abstract:  In image-guided surgical tasks, the precision and timing of hand movements depend on the effectiveness of visual cues relative to specific target areas in the surgeon’s peri-personal space. Two-dimensional (2D) image views of real-world movements are known to negatively affect both constrained (with tool) and unconstrained (no tool) hand movements compared with direct actionContinue reading “Effects of 2D and 3D image views on hand movement trajectories in the surgeon’s peri-personal space in a computer controlled simulator environment”

Getting nowhere fast: trade-off between speed and precision in training to execute image-guided hand-tool movements

Abstract: The speed and precision with which objects are moved by hand or hand-tool interaction under image guidance depend on a specific type of visual and spatial sensorimotor learning. Novices have to learn to optimally control what their hands are doing in a real-world environment while looking at an image representation of the scene onContinue reading “Getting nowhere fast: trade-off between speed and precision in training to execute image-guided hand-tool movements”

Effects of indirect screen vision and tool-use on the time and precision of object positioning on real-world targets

Abstract: A current approach for surgical imaging is to employ a single camera with a fisheye lens, the latter providing a hemispherical focus of vision with poor off-axis resolution and aberrant shape contrast effects at the edges of objects viewed on the screen. We built an experimental platform for testing effects of fisheye screen representationsContinue reading “Effects of indirect screen vision and tool-use on the time and precision of object positioning on real-world targets”

The impact of link unidirectionality and reverse path length on wireless sensor network lifetime

Abstract: The occurrence of unidirectional links in wireless sensor networks (WSNs) is an inherent feature of wireless communication. Transceiver characteristics, asymmetric interference, and many other properties of the electromagnetic propagation environment result in link unidirectionality, however, transmission power heterogeneity is the dominant factor that creates unidirectional links. Most of the data transfer mechanisms designed forContinue reading “The impact of link unidirectionality and reverse path length on wireless sensor network lifetime”

Design of a quadrotor roll controller using system identification to improve empirical results

Abstract:  Unmanned Aerial Vehicles (UAVs), specifically quadrotors, is one of the major topics of study in current literature with applications to numerous fields. In this paper we consider a test-bed for the design of a low cost flight controller for a quadrotor and as a first step in design we demonstrate the design of theContinue reading “Design of a quadrotor roll controller using system identification to improve empirical results”

Improving quadrotor 3-axes stabilization results using empirical results and system identification

Abstract: In current literature, Unmanned Aerial Vehicles (UAVs), especially quadrotors, is one of the hot topics of study which has numerous applications. This paper focuses on modeling the quadrotor in order to improve the empirical results. The procedure consists of four stages: 1) Experimental determination of controller coefficients, 2) Data collection, 3) System identification, 4)Continue reading “Improving quadrotor 3-axes stabilization results using empirical results and system identification”

UZAKTAN MAYIN TARAMA VE TANIMLAMA SİSTEM ÖN TASARIMI

Abstract of the paper The use of remote access and remote visualization tools in unmanned projects of today’s defence systems has been gathering considerable momentum over the past decade or so. In this context, re-assessment of the applications which were used in the past is one of the popular practices. In this paper, “Nusret Minelayer”,Continue reading “UZAKTAN MAYIN TARAMA VE TANIMLAMA SİSTEM ÖN TASARIMI”