• Title/Summary/Keyword: Virtual Assistance

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Reconstruction of esophageal stenosis that had persisted for 40 years using a free jejunal patch graft with virtual endoscopy assistance

  • Fujisawa, Daisuke;Asato, Hirotaka;Tanaka, Katsunori;Itokazu, Tetsuo;Kojya, Shizuo
    • Archives of Plastic Surgery
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    • v.47 no.2
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    • pp.178-181
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    • 2020
  • In this report, we present a case in which good results were achieved by treatment using a free jejunal patch graft with virtual endoscopy (VE) assistance in a patient whose swallowing had failed to improve for 40 years after he mistakenly swallowed sulfuric acid, despite pectoralis major myocutaneous flap grafting and frequent balloon dilatation surgery. During the last 20 years, virtual computed tomography imaging has improved remarkably and continues to be used to address new challenges. For reconstructive surgeons, the greatest advantage of VE is that it is a noninvasive modality capable of visualizing areas inaccessible to a flexible endoscope. Using VE findings, we were able to visualize the 3-dimensional shape beyond the stenosis. VE can also help predict the area of the defect after contracture release.

Research on Cognitive Effects and Responsiveness of Smartphone-based Augmented Reality Navigation (스마트폰 증강현실 내비게이션의 인지능력과 호응도에 관한 연구)

  • Sohn, Min Gook;Lee, Seung Tae;Lee, Jae Yeol
    • Korean Journal of Computational Design and Engineering
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    • v.19 no.3
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    • pp.272-280
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    • 2014
  • Most of the car navigation systems pzrovide 2D or 3D virtual map-based driving guidance. One of the important issues is how to reduce cognitive burden to the driver who should interpret the abstracted information to real world driving information. Recently, an augmented reality (AR)-based navigation is considered as a new way to reduce cognitive workload by superimposing guidance information into the real world scene captured by the camera. In particular, head-up display (HUD) is popular to implement AR navigation. However, HUD is too expensive to be set up in most cars so that the HUD-based AR navigation is currently unrealistic for navigational assistance. Meanwhile, smartphones with advanced computing capability and various sensors are popularized and also provide navigational assistance. This paper presents a research on cognitive effect and responsiveness of an AR navigation by a comparative study with a conventional virtual map-based navigation on the same smartphone. This paper experimented both quantitative and qualitative studies to compare cognitive workload and responsiveness, respectively. The number of eye gazing at the navigation system is used to measure the cognitive effect. In addition, questionnaires are used for qualitative analysis of the responsiveness.

A method for determining the timing of intervention in a virtual reality environment

  • Jo, Junghee
    • Journal of the Korea Society of Computer and Information
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    • v.27 no.1
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    • pp.69-75
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    • 2022
  • This paper proposes a method of identifying the moment when a student with developmental disabilities needs assistance intervention in performing barista vocational training using virtual reality-based realistic contents. To this end, 21 students enrolled in a vocational training center for persons with disabilities were selected as study subjects. These students were trained to recognize the barista tools in a virtual reality environment. During the training, if students experienced difficulties and were unable to proceed further, they were asked to raise their hands or verbally request assistance. Using the collected data, two hypotheses were established based on the distance between the hand of the student and each barista tool in the virtual reality space in order to derive a criterion for judging the moment when an intervention is required. As a result of verifying the hypotheses, this study found that the cumulative distance from the hand of a student, who successfully finished the training without requiring an intervention, to the target barista tool as well as adjacent tools was significantly shorter than the cumulative distance to other barista tools.

3D Graphics Visualization and Context Information Service for a Virtual Tourist System

  • Nguyen, Congdu;Le, Minh Tuan;Yoon, Dae-Il;Kim, Hae-Kwang
    • Journal of Ubiquitous Convergence Technology
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    • v.1 no.1
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    • pp.47-52
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    • 2007
  • In this paper, we present a virtual tourist system with realtime 3D visualization and the assistance of context information service. Our system enables a visitor to take a discovering tour on a virtual environment from a remote client by following navigator or by self-navigating. During the tour, the system provides immersive 3D graphics contents while supporting relevant information to the visitors corresponding to their positions in the virtual environment. When the visitors interact with interested objects, the context information service will also support introduction information for presenting about the objects. The introduction information based on text format is represented by a comfortable way-audio conversion to visitors in different languages depended on their preferences using TTS(Text-To-Speak) tool.

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A Hypervisor for ARM based Embedded Systems

  • Son, Sunghoon
    • Journal of the Korea Society of Computer and Information
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    • v.22 no.5
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    • pp.11-19
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    • 2017
  • In this paper, we propose a hypervisor for embedded systems based on ARM microprocessor. The proposed hypervisor makes it possible to run several real-time kernels concurrently on a single embedded system by virtualizing its microprocessor. With assistance of MMU, it supports virtual memory which enables each guest operating system has its own address space. Exploiting the fact that most embedded systems use memory-mapped I/O device, it provides a mechanism to distribute an external interrupt to virtual machines properly. It also achieves load balancing through live migration which moves a running virtual machine to other embedded system. Unlike other para-virtualization techniques, minor modifications are needed to run it on the hypervisor. Extensive performance measurement studies are conducted to show that the proposed hypervisor has enough potentiality of its real-world application.

Ubiquitous Marine Structure Inspection System based on Mixed Reality (해양구조물을 위한 유비쿼터스 기반의 혼합현실 유지보수 지원 시스템)

  • Lee, Kyung-Ho;Lee, Jung-Min;Kim, Dong-Guen;Han, Young-Soo
    • Journal of the Computational Structural Engineering Institute of Korea
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    • v.21 no.6
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    • pp.571-578
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    • 2008
  • Ubiquitous has spotlighted in the industry in these days, and automotive industry has tried to build ubiquitous environment like as 'intelligent driver assistance system' in BMW Inc. even though in shipbuilding industry. As the part of Ubiquitous Technology for visualization, Mixed Reality has been adopted in this paper. Augmented reality, a part of mixed reality, could show the mixed real world, overlapping virtual objects. Therefore, it is more realistic than virtual reality that all generated by computer and it is very useful for displaying information. For this reason, we tried to apply augmented reality to inspect marine structure and we developed the inspection assistance system based on mixed reality

Development of a Color Imaging Assistance Tool for Display and ASIC Development (디스플레이 및 ASIC개발을 위한 컬러이미징 지원도구 개발)

  • Kim, Jin-Seo;Kang, Byung-Ho;Cho, Maeng-Sub
    • Proceedings of the Korea Information Processing Society Conference
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    • 2003.05a
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    • pp.523-526
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    • 2003
  • 디지털 영상장비 및 화질관련 ASIC 을 개발하는 데 있어서 영상의 화질개선을 위한 보다 과학적이고 객관적인 개발 방법 및 영상 품질 평가 방법의 개발이 필요하다. 본 논문에서는 LG PDP 60", DTV 에 장착되는 ASIC 에 적용된 화질 개선 알고리즘 개발을 중심으로 다양한 종류의 영상장비 생산 현장에서 컬러과학 및 이미징과학에 대한 전문 지식이 없이 쉽게 알고리즘을 개발하고, 개발된 알고리즘을 관찰자 실험을 통해 평가, 분석할 수 있도록 개발한 컬러이미징 지원도구$(MagicQuality^{TM})$에 대하여 설명한다.

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Haptics for Human-Machine Interaction at The Johns Hopkins University

  • Okamura, Allison M.;Chang, Sung-Ouk
    • 제어로봇시스템학회:학술대회논문집
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    • 2003.10a
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    • pp.2676-2681
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    • 2003
  • The Haptic Exploration Laboratory at The Johns Hopkins University is currently exploring many problems related to haptics (force and tactile information) in human-machine systems. We divide our work into two main areas: virtual environments and robot-assisted manipulation systems. Our interest in virtual environments focuses on reality-based modeling, in which measurements of the static and dynamic properties of actual objects are taken in order to produce realistic virtual environments. Thus, we must develop methods for acquiring data from real objects and populating pre-defined models. We also seek to create systems that can provide active manipulation assistance to the operator through haptic, visual, and audio cues. These systems may be teleoperated systems, which allow human users to operate in environments that would normally be inaccessible due to hazards, distance, or scale. Alternatively, cooperative manipulation systems allow a user and a robot to share a tool, allowing the user to guide or override the robot directly if necessary. Haptics in human-machine systems can have many applications, such as undersea and space operations, training for pilots and surgeons, and manufacturing. We focus much of our work on medical applications.

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The New Modeling of Solar Cell for Virtual Implement Of Solar Cell (태양전지 가상구현 장치를 위한 새로운 태양전지 모델링에 관한 연구)

  • Lee B. I.;Ryu T. G.;Han J. M.;Choe G. H.
    • Proceedings of the KIPE Conference
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    • 2002.11a
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    • pp.69-73
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    • 2002
  • A study on photovoltaic system has a lot of problems. Such as repetition experiment in the same condition, development of MPPT(Maximum Power Point Tracking) algorithm, development of islanding detection algorithm and so forth. The reason Is that solar cell output characteristics are varied by insolarion and surface temperature of solar cell. Therefore, the assistance equipment is required which emulates the solar cell characteristics. In this paper, propose the new modeling of solar cell and verify this modeling using MATLAB simulation. And experiment virtual implement of solar cell system using this modeling.

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