Volume 9 Issue 1

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  • Kendo Headgear Concussion Safety Evaluation

    Abstract: Concussions present a potential risk in various contact sports, including the martial
    art of kendo. While there are regulations implemented on the production quality of shinai,
    the bamboo-based swords used in kendo, there is a lack of active standards enforced by an
    independent governing body for kendo armor to prevent head injuries like concussions.
    Interestingly, two separate independent governing bodies exist to regulate and ensure the
    quality of commercially-sold shinai, but none for armor. This study aimed to answer two
    important questions: firstly, whether high-end kendo helmets offer superior protection
    against concussions compared to entry-level helmets, and secondly, whether adding extra
    padding inserts to the helmets enhances overall concussion protection. To conduct the study,
    we asked several kendo practitioners and one non-practitioner to deliver a series of head
    strikes using a shinai on a mannequin wearing different kendo helmets, both with and without
    additional protective padding. Our objective was to measure the force of each strike and
    assess the associated risk of concussion. The results indicated that both types of helmets
    sustained linear accelerations well below the threshold for the risk of concussion, which is
    set at 62.4g force. Notably, there were no statistical differences regarding impact forces
    received between the helmets (p-value equals 0.13). Interestingly, we found that commercial
    helmet padding inserts did not significantly reduce the risk of concussion. In fact, one of the
    commercially made helmet inserts performed worse than using a helmet alone (p-value is
    less than 0.01). In summary, our study suggests that investing in an entry-level kendo helmet
    with a 4-mm stitch pattern can offer comparable concussion protection to a high-end helmet
    with a 2-mm stitch pattern. As for commercially available padding inserts, their potential to
    provide additional concussion protection remains inconclusive and further studies are
    needed. Implementing a standardized evaluation process can aid consumers in making
    informed decisions when selecting protective gear to prevent concussions.

    Keywords: Kendo; Concussion; Sports Safety; Kendo Gears

  • The Development of a Smartphone Application based on Object Detection and Indoor Navigation to Assist Visually Impaired

    Abstract: A mobile application designed to assist visually impaired person (VIP) in performing daily activities such as grocery shopping. The system utilizes mobile application for object and location recognition, enabling users to locate and identify items in a supermarket easily. The application provides guidance through voice and vibration. We implemented a neural network and utilized Google’s GPS API in the application and conducted simulations in a supermarket environment to demonstrate its effectiveness. The proposed mobile application has the potential to significantly improve the independence and quality of life of visually impaired individuals.
    Keywords: Visual Impairment; Image Recognition; Indoor Navigation; Mobile Application