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Yoshiki Okazaki,Takayuki Furumatsu,Yasunori Shimamura,Kenta Saiga,Hideki Ohashi,Takahiko Uchino,Yusuke Kamatsuki,Yuki Okazaki,Toshifumi Ozaki 대한슬관절학회 2019 대한슬관절학회지 Vol.31 No.2
Purpose: Medial meniscus posterior root tear (MMPRT) causes progression of medial meniscus extrusion (MME). This study aims to calculate the progression rate of MME based on findings in two preoperative magnetic resonance imaging (MRI) scans and determine the associated factors.Materials and Methods: We retrospectively reviewed 33 patients (27 females and 6 males; mean age, 60 years) who underwent MRI twice, at a mean interval of 48 days. We measured the medial meniscus body width, medial joint space width (MJSW), and MME. The MME progression rate was derived from regression analysis of the increase in MME (ΔMME) between the two MRI scans. In addition, the correlations of the MME increase rate with age, body mass index, femorotibial angle, and MJSW were evaluated.Results: The mean MME increased from 3.4 mm to 4.5 mm (p<0.001). A good correlation was observed between ΔMME and the interval of MRI scans (R2=0.621), and the MME progression rate was 0.020 mm per day. A moderate correlation was observed between the MME increase rate and the MJSW (R2=0.432). Conclusions: The MME progression rate was rapid in MMPRT and narrowing of the MJSW was associated with the progression of MME. Level of Evidence: V, Crosssectional study
Effects of Acid Deposition on Red Pine Forest in Japan and Korea
OKAZAKI, Masanori,CHISHIMA, Takashi,JOEN, Doo Sik,KIM, Yong Kul,YOO, Jeong Hwan 경희대학교 지구환경연구소 1998 국제세미나 Vol.1998 No.-
Monitoring study has been carried out in Htchioji of Japan and Chunchon of Korea from July 1996 to June 1997 to investigate the effects of acid deposition on soil ecosystems under red pine (Pinus densiflora) by collecting open bulk precipitation, throughfall, stemflow, soil solution and stream water. The weighted mean pH value of open bulk precipitation in study duration was 4.79 for Hachioji and 5.29 for Chunchon respectively, which were called "acid precipitation (rain) ". The total cation plus anion input from open bulk precipitation, throughfall and stemflow were 3.27, 10.74 and 0. 19 kmolcha-lyr-1 in Hachioji, and 2.71, 1.96 and 0.08 kmolcha-16month-1. The input of H^+ to red pine forest from throughfall amounted to 50 % of the input from open bulk precipitation in Hachioji, and 225 % of the input from open hulk precipitation in Chunchon. The weighted mean pH values of soil solution under red pine forest ranged from 5.14 to 6.62 in Hachioji and 4.99 to 6.51 in Chunchon, which markedly lower than the values of soil solution in open bare area with some exceptions.
Okazaki, Tohru,Hayashi, Hiroaki,Takegami, Kazuki,Okino, Hiroki,Kimoto, Natsumi,Maehata, Itsumi,Kobayashi, Ikuo The Korean Association for Radiation Protection 2016 방사선방어학회지 Vol.41 No.3
Background: In order to manage the patient exposure dose in X-ray diagnosis, it is preferred to evaluate the entrance skin dose; although there are some evaluations about entrance skin dose, a small number of report has been published for direct measurement of patient. We think that a small-type optically stimulated luminescence (OSL) dosimeter, named nanoDot, can achieve a direct measurement. For evaluations, the corrections of angular and energy dependences play an important role. In this study, we aimed to evaluate the angular and the energy dependences of nanoDot. Materials and Methods: We used commercially available X-ray diagnostic equipment. For angular dependence measurement, a relative response of every 15 degrees of nanoDot was measured in 40-140 kV X-ray. And for energy dependence measurement, mono-energetic characteristic X-rays were generated using several materials by irradiating the diagnostic X-rays, and the nanoDot was irradiated by the characteristic X-rays. We evaluated the measured response in an energy range of 8.1-75.5 keV. In addition, we performed Monte-Carlo simulation to compare experimental results. Results and Discussion: The experimental results were in good agreement with those of Monte-Carlo simulation. The angular dependence of nanoDot was almost steady with the response of 0 degrees except for 90 and 270 degrees. Furthermore, we found that difference of the response of nanoDot, where the nanoDot was irradiated from the randomly set directions, was estimated to be at most 5%. On the other hand, the response of nanoDot varies with the energy of incident X-rays; slightly increased to 20 keV and gradually decreased to 80 keV. These results are valuable to perform the precise evaluation of entrance skin dose with nanoDot in X-ray diagnosis. Conclusion: The influence of angular dependence and energy dependence in X-ray diagnosis is not so large, and the nanoDot OSL dosimeter is considered to be suitable dosimeter for direct measurement of entrance surface dose of patient.
Kansei Evaluation by a Remote-Controlled Robot Designed for Viewing Art Exhibits
( Okazaki Akira ),( University Of Tsukuba ) 한국감성과학회 2000 춘계학술대회 Vol.2000 No.-
The present study is part of the Special Research Project for the Construction of a Kansei Sensory Evaluation Model that is currently underway at the University of Tsukuba. In this study, a robot was operated by remote control at an actual art museum as part of a preliminary experiment. The results obtained therefrom were used to consider how people might view exhibits. In a previous study, a standard lens and s wide-angle lens were used to analyze differences in sensory-based movements, while VRML was used to analyze differences in these movements between a virtual and an actual museum. In the present study, the time delay in remote operation, which is currently unavoidable, placed some restrictions on the degree of freedom with which exhibits could be viewed, but it was apparent that sensory evaluation could be possible depending on the search behavior and viewing time. Furthermore specific viewing behaviors using the robot were observed, suggesting that new Kansei sensory perceptions were derived from these behaviors.
Okazaki, Yasuhisa,Mori, Seina,Wakuya, Hiroshi,Mishima, Nobuo,Hayashida, Yukuo,Min, Byung-Won The Korea Contents Association 2016 International Journal of Contents Vol.12 No.2
This paper describes design and development of a system that supports continuous creation of hazard maps by local residents in their daily life. We made an interview survey to design our system in a model traditional town in Saga, Japan. The results show that in spite of continuous efforts, many practical problems remain and residents feel unsafe. Based on these results, we designed and developed a unique ICT-based support system which contributes to community-based disaster prevention/reduction. The continuous resident participation and posting design are core concept for our sustainable community-based approach. Our system continues to support making a hazard map by integrating the community-based hazard information. Local residents register information about the spot (disaster types, a risk level, a photograph, comments, positional information) that can be dangerous in case of disaster. We have evaluated the usefulness and possibilities of our prototype system implemented as an iOS application.
A Simulation Study on The Behavior Analysis of The Degree of Membership in Fuzzy c-means Method
Okazaki, Takeo,Aibara, Ukyo,Setiyani, Lina The Institute of Electronics and Information Engin 2015 IEIE Transactions on Smart Processing & Computing Vol.4 No.4
Fuzzy c-means method is typical soft clustering, and requires a degree of membership that indicates the degree of belonging to each cluster at the time of clustering. Parameter values greater than 1 and less than 2 have been used by convention. According to the proposed data-generation scheme and the simulation results, some behaviors in the degree of "fuzziness" was derived.