Transactions of the Virtual Reality Society of Japan
Online ISSN : 2423-9593
Print ISSN : 1344-011X
ISSN-L : 1344-011X
Volume 14 , Issue 1
Showing 1-20 articles out of 20 articles from the selected issue
  • Type: Cover
    2009 Volume 14 Issue 1 Pages Cover1-
    Published: March 31, 2009
    Released: February 01, 2017
    JOURNALS FREE ACCESS
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  • Type: Index
    2009 Volume 14 Issue 1 Pages Toc1-
    Published: March 31, 2009
    Released: February 01, 2017
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  • Type: Index
    2009 Volume 14 Issue 1 Pages Toc2-
    Published: March 31, 2009
    Released: February 01, 2017
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  • Yoshifumi Nishida, Itaru Kitahara, Ryoichi Nakamura, Atsushi Shinjo
    Type: Article
    2009 Volume 14 Issue 1 Pages 1-
    Published: March 31, 2009
    Released: February 01, 2017
    JOURNALS FREE ACCESS
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  • Type: Appendix
    2009 Volume 14 Issue 1 Pages 2-
    Published: March 31, 2009
    Released: February 01, 2017
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  • Osamu Morikawa, Sayuri Hashimoto, Takanori Maesako
    Type: Article
    2009 Volume 14 Issue 1 Pages 3-10
    Published: March 31, 2009
    Released: February 01, 2017
    JOURNALS FREE ACCESS
    In counseling, the role of non-verbal communication such as expression, spacing, physical contact is very important. Roleplaying is one of useful methods of counseling. According to circumstances, physical contact is used in order to that roleplaying may be more effective. When counselors want to use physical contact in counseling, they can use a virtual contact instead of physical one without ethical problems. Therefore, we propose Remote Counseling system with virtual embrace using HyperMirror.
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  • Koji Kitamura, Itsumi Kakefuda, Yoshifumi Nishida, Yoichi Motomura, Ta ...
    Type: Article
    2009 Volume 14 Issue 1 Pages 11-19
    Published: March 31, 2009
    Released: February 01, 2017
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    Developing effective safety messages targeting parents is one of the key issues of injury prevention and safety promotion research. The present study was conducted using online-experiment as well as a focus-group methodology to evaluate message effects of animations which depicted childhood injury situations. Parents with children aged 0.5-2 years participated in the study. Compared to simple texts with illustrations on a paper describing injury scenes, animations appeared to be more effective in terms of leaving a strong impression. Focus-group discussion revealed that animations gave parents an opportunity to consider strategies to prevent injuries depicted in the animations. The results suggested that further examination of effectiveness of injury scene animations in safety education is worthwhile.
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  • Kazutaka Mitobe, Masahiro Saito, Masafumi Suzuki, Noboru Yoshimura
    Type: Article
    2009 Volume 14 Issue 1 Pages 21-28
    Published: March 31, 2009
    Released: February 01, 2017
    JOURNALS FREE ACCESS
    As an application of a VR technology for a traffic safety, we developed the walking environment simulator system that combined a motion capture system and treadmill. Using this simulator, the human factor related to elder pedestrian traffic accidents was examined. As a result, traffic accidents of elder people occurred frequently in a far side lane. Most of subjects involved in a traffic accident cut across the narrow space of the distance between two cars in a far side lane. These results show that the decline of the cognitive function of an approach speed will be one of the risk factor of traffic accident.
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  • Akira Urashima, Masakazu Miyamae, Futoshi Naya, Tomoji Toriyama, Kiyos ...
    Type: Article
    2009 Volume 14 Issue 1 Pages 29-38
    Published: March 31, 2009
    Released: February 01, 2017
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    We are developing a hand hygiene checking system for nurses in hospital. This system recognizes realtime location and activity of the nurse with an infrared ID tag and four 3-axis acceleration sensors. Based on his/her cleanness state estimated from the location and activity by applying to the cleanness model, it detects the situations in which hand hygiene is required and it can inform proper hand hygiene warning to the nurse. Preliminary studies in laboratory environment indicate that it can detect all the handwashing necessary situations and the large part of the situations in which antiseptic hand rub is required.
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  • Miyuki Uematsu, Yoshitaka Nakano, Kodai Matsukawa, Ryuhei Utsunomiya, ...
    Type: Article
    2009 Volume 14 Issue 1 Pages 39-48
    Published: March 31, 2009
    Released: February 01, 2017
    JOURNALS FREE ACCESS
    To facilitate the accurate orientation of the surgical fields, we had developed a Multidimensional CT-based navigation system and clinically applied in thoracoabdominal aortic aneurysm repair with selective reconstruction of Adamkiewicz artery. Thirty patients who had thoracoabdominal aortic aneurysm were studied using Multidimensional CT imaging to identify their Adamkiewicz artery preoperatively. During navigation, the pointer location was measured by the sensor in the surgical field, and simultaneously, anatomical structures were visualized by the three-dimensional images. Then the position of the targeted intercostal arteries were successfully found in the real field, the targeted arteries and major visceral arteries were reconstructed. Hospital deaths were one patient and there was no paraplegia. A new navigation system was effective to improve an accurate orientation. Our clinical experiences exhibited that this system for thoracoabdominal aortic aneurysm repair provides a safe and effective surgery.
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  • Huy Hoang Tran, Takehito Teraguchi, Hiromasa Yamashita, Ken Masamune, ...
    Type: Article
    2009 Volume 14 Issue 1 Pages 49-54
    Published: March 31, 2009
    Released: February 01, 2017
    JOURNALS FREE ACCESS
    A navigation system has been developed for minimally invasive knee-joint surgery in this study. Registrations between patient and images are performed by use of surface matching. The registration method are less invasive than other methods such as attaching markers directly to patient or using X-ray images for image-based registration. The system is also integrated with a three dimensional (3D) display, which can visualize 3D images of the anatomical structures as well as the peripheral equipments. Feasibility studies with a set of experiments showed that the registration position error was less than 1.0 mm and determination of the insertion path was 3 times faster than the conventional method. With improvements of the quality of the 3D display and the registration method, the system is possible to be utilized in knee-joint surgery.
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  • Futoshi Naya, Satoshi Takahashi, Masakazu Miyamae, Tsutomu Terada, Har ...
    Type: Article
    2009 Volume 14 Issue 1 Pages 55-66
    Published: March 31, 2009
    Released: February 01, 2017
    JOURNALS FREE ACCESS
    We have developed a new battery-operated sensor node based on ZigBee wireless network in order to track people's location even with a poor electrical infrastructure. For a sensor network consisting of such kind of sensor nodes, we have designed a flexible sleep control protocol which fulfills low-battery consumption as well as high-accuracy time synchronization between these nodes. We have deployed a sensor network system composed of more than 40 sensor nodes in a hospital floor for tracking more than fifteen nurses simultaneously. Experimental results show that the system can operate around 27 days using four AA size NiMH batteries and can achieve 90% accuracy in the location estimation.
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  • Ren Ohmura, Futoshi Naya, Haruo Noma, Kiyoshi Kogure
    Type: Article
    2009 Volume 14 Issue 1 Pages 67-77
    Published: March 31, 2009
    Released: February 01, 2017
    JOURNALS FREE ACCESS
    This paper describes a system, named ENVis, that supports nursing activity analysis based on sensor data. For enabling efficient analysis, such a system should have following functions; 1)sensor data and annotation data are linked seamlessly; 2)various visualizations can be handled; 3)sensor and annotation data of different cases can be directly comparable; 4)multiple data can be handled for obtaining tendency. The ENVis realizes these functions by taking MVC structure. in which the model handles sensor and annotation data indistinguishably, the views are implemented as plug-in modules, and the controller has layered playing time control. This paper describes detail of the ENVis implementation and its effectiveness with practical examples of nursing activity analysis.
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  • Taketsugu Hirabayashi, Hiroaki Yano, Hiroo Iwata
    Type: Article
    2009 Volume 14 Issue 1 Pages 79-88
    Published: March 31, 2009
    Released: February 01, 2017
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    Mechanization of diving operations is necessary for safer and more efficient underwater construction works in port areas. The transportation of the heavy material in water are done by crane vessel. But, it is impossible that the crane operator confirms divers safety by watching. The technology which can do the underwater construction more safely and efficiently is necessary. Operation of the man-machine interface should be easy and intuitive for efficient works when using a remote-controlled underwater excavator. Moreover, operation is preferable to be unwearying. The aim of this research is to evaluate the operativeness of the joystick-type-interface that is newly proposed. The operativeness of the joystick and that of the similar-figure-interface were compared in the pointing experiment. As for the pointing experiment, the operation efficiency was evaluated by the speed and the accuracy of the operation of the excavator front part, and the tiredness level was evaluated through the hearing to the operators. As a result, concerning the new interface that uses a joystick, operation efficiency was found to be almost equal to the similar-figure-interface and the tiredness level has been improved. Moreover, the construction material transportation in water was assumed, and the handling experiment was done. The mechanization of the heavy work for underwater can be expected by the result of this research.
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  • Jun-ichi Fujimori, Yasuhiro Oikawa, Yoshio Yamasaki
    Type: Article
    2009 Volume 14 Issue 1 Pages 89-96
    Published: March 31, 2009
    Released: February 01, 2017
    JOURNALS FREE ACCESS
    Identification number of a subway station or telephone number of a shop on a signboard helps foreigners to access them easily because the Arabic numerals are used worldwide. This paper proposes audio representations of the Arabic numerals by means of non-vocal tone as a minimal and universal communication for security and safety. The audible numerals are useful also for operating devices in situation of driving a car. The proposed method employs base-5 numeral system and on-off keying. The listening test shows that the explanation about the method is needed only once for the subjects to understand the coding scheme correctly.
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  • Masataka Niwa, Yuichi Itoh, Fumio Kishino, Yoshinobu Iwaki, Keiji Hour ...
    Type: Article
    2009 Volume 14 Issue 1 Pages 97-105
    Published: March 31, 2009
    Released: February 01, 2017
    JOURNALS FREE ACCESS
    Recently, many researches have focused on avoiding tragic accidents by identifying causes and situations of them with various kinds of sensors. Especially, fall accidents from high place are one of the causes for death and serious injury, and the avoidance of this accident is highly demanded all over the world. We note the fact that the safety belt's hook which has to be fastened to the safety rope has been unused or used incorrectly in the most of these accidents. Consequently, in this paper we propose the method to identify the incorrect use of the safety belt's hook with an acceleration sensor and evaluate the prototype system by conducting experiments.
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  • Naohito Watabe, Shingo Nagamura, Yasunori Saito, Jun Murayama, Tetsuya ...
    Type: Article
    2009 Volume 14 Issue 1 Pages 107-110
    Published: March 31, 2009
    Released: February 01, 2017
    JOURNALS FREE ACCESS
    To reveal effects of virtual reality training on brain activity, the authors developed virtual reality contents as well as video contents for hydropower facilities maintenance works. Using these contents for eight healthy subjects, the authors measured hemoglobin fluctuations in cerebral blood flow (CBF) of respective subjects with near-infrared spectroscopy (NIRS). According to neuroimaging studies with NIRS, cerebral activity in frontal associated area of healthy subjects normally yields to both clear increase of oxy-hemoglobin and slight decrease of deoxy-hemoglobin. With this in mind, oxy- and deoxy-hemoglobin fluctuation data were statistically analyzed in deep. As a result, more significant responses in executing virtual reality contents than those in video contents were revealed.
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  • Hideki Koike, Wataru Nishikawa, Kentaro Fukuchi
    Type: Article
    2009 Volume 14 Issue 1 Pages 111-119
    Published: March 31, 2009
    Released: February 01, 2017
    JOURNALS FREE ACCESS
    Liquid Cristal Displays are getting larger, thinner, lighter, and cheaper. They have many advantages when they are used as a tabletop compared to the projector-based tabletop. As is well known, a light from the LCD is polarized and it is blocked when a polarized film is placed as its axis of polarization is perpendicular to that of the LCD. On the other hand, an additional polarized film cancels this image blocking when it is placed on the LCD. By using this optical phenomenon, we developed transparent markers which are almost invisible to human but are still visible to the camera. Moreover, we succeeded to make the markers rotation invariant by using two half waveplates. Tangible transparent Magic Lens applications which use the transparent markers are also shown.
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  • Tomoki Haji, Izuru Nose, Narumi Katsuyama, Masato Taira
    Type: Article
    2009 Volume 14 Issue 1 Pages 121-130
    Published: March 31, 2009
    Released: February 01, 2017
    JOURNALS FREE ACCESS
    Although recent advances in the computer graphics technique allow us to generate photo-like images (ex. painting), we can distinguish them from real photos. This suggests that an ability to detect the differences between real photo and photo-like images, that is an ability to detect the differences of realistic appearances, may be embedded in our cognitive system. In this study, we investigated the cortical mechanisms underlying this ability by means of fMRI. We found several brain regions, including middle occipital gyrus, middle temporal gyrus, temporo-parieto-occipital junction, parieto occipital sulcus (POS), fusiform gyrus (FG), and middle frontal gyrus (MFG), were activated during the photo-painting evaluation task. The detailed analysis showed that the activity in the POS and MFG was specifically enhanced when participants evaluate the presented images as more painting-like, while activation in the other regions was correlated with the physical properties of images, such as chromaticity, luminance or high spatial frequency component of images. These results suggest that the POS-MFG network may play a crucial role in the detection of differences between real photos and photo-like images.
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  • Shinichi Onimaru, Hiroaki Shigemasu, Michiteru Kitazaki
    Type: Article
    2009 Volume 14 Issue 1 Pages 131-139
    Published: March 31, 2009
    Released: February 01, 2017
    JOURNALS FREE ACCESS
    We aimed to investigate the effects of eccentricity and size of visual field on visually induced postural sway. Optic flow stimuli were presented in a Central Vision (CV) condition and four Peripheral Vision (PV) conditions. In the CV condition, random dots were presented in a circular area (15 deg in radius). In the PV conditions, random dots were presented in the outside of the central area (15 deg in radius) to be a ring (donut) shape. Scaling factors of the donut areas were 0.5, 1.0, 2.0, and 4.0 times of the area of CV condition. Random dots moved laterally or radially back and forth at 0.2 Hz in all conditions. We found head movement in CV condition was stronger than all PV conditions for the lateral motion, and was not significantly different from PV conditions for the radial motion. By applying the cortical magnification factor, the advantage of CV disappeared, but the strength of postural sway decreased with eccentricity in PV conditions. Thus, the mechanism of visual control of posture cannot be accounted for only by retinal eccentricity, retinal size or cortical size, but some other factors or mixed factors should be considered.
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