Transactions of the Virtual Reality Society of Japan
Online ISSN : 2423-9593
Print ISSN : 1344-011X
ISSN-L : 1344-011X
Volume 13 , Issue 4
Showing 1-16 articles out of 16 articles from the selected issue
  • Type: Cover
    2008 Volume 13 Issue 4 Pages Cover1-
    Published: December 31, 2008
    Released: February 01, 2017
    JOURNALS FREE ACCESS
    Download PDF (4394K)
  • Type: Index
    2008 Volume 13 Issue 4 Pages Toc1-
    Published: December 31, 2008
    Released: February 01, 2017
    JOURNALS FREE ACCESS
    Download PDF (88K)
  • Type: Index
    2008 Volume 13 Issue 4 Pages Toc2-
    Published: December 31, 2008
    Released: February 01, 2017
    JOURNALS FREE ACCESS
    Download PDF (28K)
  • Hiroyuki Kajimoto, Haruo Noma
    Type: Article
    2008 Volume 13 Issue 4 Pages 413-
    Published: December 31, 2008
    Released: February 01, 2017
    JOURNALS FREE ACCESS
    Download PDF (151K)
  • Type: Appendix
    2008 Volume 13 Issue 4 Pages 414-
    Published: December 31, 2008
    Released: February 01, 2017
    JOURNALS FREE ACCESS
  • Kouta Minamizawa, Sho Kamuro, Naoki Kawakami, Susumu Tachi
    Type: Article
    2008 Volume 13 Issue 4 Pages 415-420
    Published: December 31, 2008
    Released: February 01, 2017
    JOURNALS FREE ACCESS
    We propose a novel wearable haptic interaction system that delivers a realistic haptic feedback from virtual objects in midair. We evaluated the recognition ability of virtual objects through encounter, contour following, and pinch behaviors by using our proposed finger-worn haptic display, and then confirmed that the high-accuracy representation of the position and size makes a stable feeling of existence of the virtual object even in the air. Our proposed method can be used in entertainment, telecommunication, and virtual reality systems.
    Download PDF (1377K)
  • Shu Okamoto, Nobuchika Sakata, Shogo Nishida
    Type: Article
    2008 Volume 13 Issue 4 Pages 421-428
    Published: December 31, 2008
    Released: February 01, 2017
    JOURNALS FREE ACCESS
    Under a remote collaboration, a teleoperated laser pointer is applied as an instruction tool to indicate real-world objects in a real work space. Ubiquitous devices mounting a teleoperated laser pointer make telecommunications smooth. However, this method has a difficulty identifying the indicated object in the situation that the laser-spot is occluded behind indicated object itself or other objects. In this paper, we propose a method, that is visualizing the light path of a laser with jetting mists along the light axis, to remedy the difficulty. It is expected that the worker can estimate the indicated object from visible light path laser pointer. We conducted experiments to evaluate our method on the condition that the instructor and the worker exist face-to-face. The result shows that the estimation accuracy of the position of a laser-spot occluded behind an object is improved with visualizing the light path of the laser.
    Download PDF (1905K)
  • Riichiro Tadakuma, Kenjiro Tadakuma, Kazuhito Yokoi
    Type: Article
    2008 Volume 13 Issue 4 Pages 429-438
    Published: December 31, 2008
    Released: February 01, 2017
    JOURNALS FREE ACCESS
    In this research, we propose the analysis method of visual and haptic information flow in human central nervous system by using a wearable haptic display for hairy skin of human arm. This display can produce haptic stimulation on the hairy skin of human arm by using DC motors. In the evaluation experiment, we used the virtual reality system with physical mass-spring-damper calculation, and controlled virtual arm with mechanical haptic display and motion capture system.
    Download PDF (1451K)
  • Masayuki Kanbara, Akihiro Hamaguchi, Kazuki Yamanaka, Naokazu Yokoya
    Type: Article
    2008 Volume 13 Issue 4 Pages 439-449
    Published: December 31, 2008
    Released: February 01, 2017
    JOURNALS FREE ACCESS
    This paper describes a new method of measuring user's position for location-based services in wide indoor environments. Conventional localization methods usually employ a hybrid approach in which user's position is estimated by combining positioning infrastructures and a pedometer. Since the installation cost of infrastructures increases when the area expands, the measurement of user's relative position with high accuracy is required. This paper proposes a new localization method for a walking or running user by measuring user's orientation and geometrical relationship between user's heel and waist with an orientation sensor and an electromagnetic tracker that are attached to user's body. Experiments have been carried out using a prototype system to evaluate the accuracy of user localization with the proposed method.
    Download PDF (1679K)
  • Satoshi Sakurai, Yoshifumi Kitamura, Yuichi Itoh, Miguel A. Nacenta, S ...
    Type: Article
    2008 Volume 13 Issue 4 Pages 451-460
    Published: December 31, 2008
    Released: February 01, 2017
    JOURNALS FREE ACCESS
    We propose a system design including the architecture, data flows, and communication protocols etc. to realize a seamless multi-display environment (MDE). Our interaction architecture combines distributed input and position tracking data to generate perspective-corrected output in each of the displays, allowing groups of users to manipulate existing applications from current operating systems across a large number of displays. To test our design we implemented a complex MDE prototype and measured different aspects of its performance. Then we discuss the results of the measurements and the potential availabilities.
    Download PDF (1850K)
  • Takeharu Seno, Takao Sato
    Type: Article
    2008 Volume 13 Issue 4 Pages 461-468
    Published: December 31, 2008
    Released: February 01, 2017
    JOURNALS FREE ACCESS
    Vection is an illusory motion perception of the body induced by visual motion stimuli. Recent brain-imaging studies emphasized the contributions of relatively high-level brain areas in vection induction. However, Gurnsey et. al. (1998) suggested involvements of lower-level motion processing by using psychophysical analyses. In this study, we examined the involvements of low-level visual system quantitatively by using 2f+3f stimuli (Nishida & Sato, 1995, where high-level and low-level motion move simultaneously in opposite directions). These stimuli enabled us to compare the contributions of both high-level and low-level motion signals to vection. Results showed the stronger vection inductions by low-level motion signals regardless of the balance between the motion signals of the two types. These results strongly suggest the importance of low-level visual processing in vection induction.
    Download PDF (1215K)
  • Masayuki Kawai, Kouki Hirota, Shogo Kuroyanagi
    Type: Article
    2008 Volume 13 Issue 4 Pages 469-475
    Published: December 31, 2008
    Released: February 01, 2017
    JOURNALS FREE ACCESS
    In this research, we developed a real-time fluid simulator for graphic and haptic interfaces to display a virtual environment including 3-dimensional fluid by using smoothed particles hydrodynamics (SPH). SPH is a type of particle method and is suitable for a fast computation; however, it is difficult to incorporate sufficient fluid incompressibility in SPH for simulating a real-time process. This is because SPH was originally developed to study compressible fluid dynamics. In this paper, we propose a new control method using nonlinear feedback to compensate for elements that interfere with incompressible motions and propose its implementation method that does not significantly increase the computation time. Finally, simulations are performed to compare the proposed method with a conventional method, and the effectiveness of the proposed method is quantitatively demonstrated from the standpoints of computation time and incompressibility.
    Download PDF (1017K)
  • Type: Appendix
    2008 Volume 13 Issue 4 Pages 477-
    Published: December 31, 2008
    Released: February 01, 2017
    JOURNALS FREE ACCESS
    Download PDF (68K)
  • Type: Appendix
    2008 Volume 13 Issue 4 Pages 479-481
    Published: December 31, 2008
    Released: February 01, 2017
    JOURNALS FREE ACCESS
    Download PDF (178K)
  • Type: Appendix
    2008 Volume 13 Issue 4 Pages App1-
    Published: December 31, 2008
    Released: February 01, 2017
    JOURNALS FREE ACCESS
    Download PDF (33K)
  • Type: Cover
    2008 Volume 13 Issue 4 Pages Cover2-
    Published: December 31, 2008
    Released: February 01, 2017
    JOURNALS FREE ACCESS
    Download PDF (160K)
feedback
Top