In recent years, atomic force microscopy as a basic tool for nanoparticles displacement and manufacturing of intended subjects from atoms and molecules has attracted researchers in different fields ...such as drug delivery, tissue engineering and etc. Manipulation simulation of the AFM nanorobot is a fundamental tool for controlled and accurate displacement of subjects and particles in different scales. Since passing from macro to micro and nanoscales causes the increased ratio of the area to volume consequently surface forces such as friction and adhesion become more important. According to the surface roughness in contact, critical time and force have been extracted in this paper considering particle and substrate roughness simultaneously to find out the effect of the surface roughness on critical parameters. Therefore, developed rough models for viscoelastic state have been used and asperities radius using experimental test on cancer cells has been extracted to increase simulation accuracy. Results show that the critical force for the elastic, rough viscoelastic and viscoelastic models have higher magnitudes respectively. This difference between elastic and viscoelastic models are completely obvious but between two viscoelastic models are less.
This experimentation proposes a new interaction technique for 3D puzzle solving using a cubic device with five multitouch surfaces. The interaction is based on three levels. First, the device is used ...to move a 3D pointer (a selection box) into the virtual environment using. Such translations are performed relying on all the device faces. Once the selection icon is close to a piece of the puzzle, the user can grab it into this selection box, where he can orientate it freely using the four vertical faces of the device. The position of the 3D object is therefore global using the selection box, but its orientation is local regarding to the interaction on the device. Thanks to this combination the user can take, move, orientate and put in place the puzzle pieces to solve the problem.
Researches on using virtual reality (VR) to support computer-aided design are rapidly increasing in recent years. This is because VR techniques are very helpful in improving the interactivity and 3D ...visualization function of CAD systems. In this paper, we present an approach to solid modeling in a semi-immersive virtual environment. The approach allows users to create, manipulate and visualize a precise solid model by direct 3D manipulations and voice commands in a virtual environment with a 3D input device. In the approach, to make the solid model created and modified by direct 3D manipulations precise, real-time constraint recognition, propagation and solution algorithms are developed and utilized. An extended solid model is also adopted to effectively support the solid modeling by direct 3D manipulations. The experiment shows that the approach enables users to conduct solid modeling intuitively, effectively and accurately, thus can be used for both early stage design and detailed design.
A system for desktop conceptual 3D design Oh, Ji-Young; Stuerzlinger, Wolfgang
Virtual reality : the journal of the Virtual Reality Society,
06/2004, Volume:
7, Issue:
3-4
Journal Article
Peer reviewed
In the traditional design process for a 3D environment, people usually depict a rough prototype to verify their ideas, and iteratively modify its configuration until they are satisfied with the ...general layout. In this activity, one of the main operations is the rearrangement of single and composite parts of a scene. With current desktop virtual reality (VR) systems, the selection and manipulation of arbitrary objects in 3D is still difficult. In this work, we present new and efficient techniques that allow even novice users to perform meaningful rearrangement tasks with traditional input devices. The results of our work show that the presented techniques can be mastered quickly and enable users to perform complex tasks on composite objects. Moreover, the system is easy to learn, supports creativity, and is fun to use. PUBLICATION ABSTRACT
A 3D desktop puzzle assembly system Shuralyov, D; Stuerzlinger, W
2011 IEEE Symposium on 3D User Interfaces (3DUI),
2011-March
Conference Proceeding
We describe a desktop virtual reality system targeted at 3D puzzle assembly. The results of the evaluation show that all novices could successfully complete the puzzle within an average of about six ...minutes, while experts took about two minutes.
Cooperative manipulation techniques allow multiple users to interact with an object together at the same time. This kind of collaboration allow users to solve complex tasks that would be difficult ...for a single user to perform. The EGOEXO technique proposed in this paper places two collaborating users in asymmetric viewpoint positions. It was developed from the premise that simultaneous control over navigation and manipulation by the user can increase the interaction complexity. Our technique allows one of the users to follow the object being manipulated automatically while the other stays in a fixed position farther away. Our technique separates the degrees of freedom between the two users, matching the degrees to the most suitable viewpoints. Each user interacts with objects using complimentary manipulation techniques, which were chosen based on which degrees they control. EGO-EXO is implemented and evaluated through a user study to test how well it performs when compared to a similar technique when both user viewpoints are fixed.
The importance of 3D interaction is constantly increasing - not least because of new developments in ubiquitous computing and augmented and virtual reality. Current 3D user interfaces allow for an ...expressive and accurate input in three-dimensional space. 3D interaction techniques are responsible for mapping the three-dimensional input onto actions within the system and for returning appropriate feedback to the user. For developers of applications using 3D interaction and for designers of new 3D interaction techniques it is important to understand how existing techniques differ and how they can be classified. In this work we summarize existing characterizations of 3D interaction and adapt them to allow a comprehensive classification of 3D interaction techniques for selection and manipulation of virtual objects.
recently, manipulation of biological particles in different mediums with utilizing atomic force microscope (AFM), has become more common. The migration of biological and non-biological micro/Nano ...particles have been extensively considered for various purposes, such as medicine, Nano-robotics, and assembly of parts. In the field of medicine, due to the high sensitivity of live cells and their vulnerability, in manipulation of single cells for diagnosing and treatment of cancer as well as tissue engineering, it is necessary to determine the path with the least amount of damage and the highest level of safety and precision for biological particles. In this paper for the first time, the optimal path of the particle's motion is determined by considering the mechanical and morphological properties of the cell. The shortest path with the least amount of cell's deformation, considering the mechanical properties of breast cancer cells and applying particle's roughness, is determined by using the equations of 3D manipulation of viscoelastic spherical particles and genetic algorithm. Thereby, there will be no concern for the deformation and vulnerability of biological particles such as cells in manipulation process by AFM micro-robot.
The capabilities of the atomic force microscopy to work in different environments and small scales such as nano and micro made it applicable in nano devices assemble, nano surgery and etc. In this ...paper, due to these applications and the necessity of high accuracy in such operations, the importance of the tool's error, the maximum applied force on the tool and the maximum deformation of the particle in possible costs, it has been tried to minimize these factors along the path planning using genetic algorithm. This aim will be reached considering constraints such as critical force and time which affect particle's motion, the maximum applied force affecting velocity and coordinates which define path range. According to the possibility of fixed and moving obstacles existence, randomly stationary and moving obstacles will be considered. Path planning for viscoelastic biological particles has been done based on mentioned constraints and conditions and results were compared with the previous works.
3DTouch and HOMER-S Mossel, Annette; Venditti, Benjamin; Kaufmann, Hannes
Proceedings of the Virtual Reality International Conference: Laval Virtual,
03/2013
Conference Proceeding
Existing interaction techniques for mobile AR often use the multi-touch capabilities of the device's display for object selection and manipulation. To provide full 3D manipulation by touch in an ...integral way, existing approaches use complex multi finger and hand gestures. However, they are difficult or impossible to use in one-handed handheld AR scenarios and their usage requires prior knowledge. Furthermore, a handheld's touch screen offers only two dimensions for interaction and limits manipulation to physical screen size. To overcome these problems, we present two novel intuitive six degree-of-freedom (6DOF) manipulation techniques, 3DTouch and HOMER-S. While 3DTouch uses only simple touch gestures and decomposes the degrees of freedom, Homer-S provides full 6DOF and is decoupled from screen input to overcome physical limitations. In a comprehensive user study, we explore performance, usability and accuracy of both techniques. Therefore, we compare 3DTouch with HOMER-S in four different scenarios with varying transformation requirements. Our results reveal both techniques to be intuitive to translate and rotate objects. HOMER-S lacks accuracy compared to 3DTouch but achieves significant performance increases in terms of speed for transformations addressing all 6DOF.
