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Takayuki Takahashi,Hikaru Matsuoka,Rieko Sakurai,Jun Akatsuka,Yusuke Kobayashi,Masaru Nakamura,Takashi Iwata,Kouji Banno,Motomichi Matsuzaki,Jun Takayama,Daisuke Aoki,Yoichiro Yamamoto,Gen Tamiya 대한부인종양학회 2022 Journal of Gynecologic Oncology Vol.33 No.5
Objective: Human papillomavirus subtypes are predictive indicators of cervical intraepithelial neoplasia (CIN) progression. While colposcopy is also an essential part of cervical cancer prevention, its accuracy and reproducibility are limited because of subjective evaluation. This study aimed to develop an artificial intelligence (AI) algorithm that can accurately detect the optimal lesion associated with prognosis using colposcopic images of CIN2 patients by utilizing objective AI diagnosis. Methods: We identified colposcopic findings associated with the prognosis of patients with CIN2. We developed a convolutional neural network that can automatically detect the rate of high-grade lesions in the uterovaginal area in 12 segments. We finally evaluated the detection accuracy of our AI algorithm compared with the scores by multiple gynecologic oncologists. Results: High-grade lesion occupancy in the uterovaginal area detected by senior colposcopists was significantly correlated with the prognosis of patients with CIN2. The detection rate for high-grade lesions in 12 segments of the uterovaginal area by the AI system was 62.1% for recall, and the overall correct response rate was 89.7%. Moreover, the percentage of high-grade lesions detected by the AI system was significantly correlated with the rate detected by multiple gynecologic senior oncologists (r=0.61). Conclusion: Our novel AI algorithm can accurately determine high-grade lesions associated with prognosis on colposcopic images, and these results provide an insight into the additional utility of colposcopy for the management of patients with CIN2.
EFFECT OF Na₂O ADDITION ON MAGNETIC PROPERTIES OF SrZn₂-W TYPE HEXAGONAL FERRITE
Hiroshi Yamamoto,Hiroshi Fujii,Takayuki Mitsuoka 한국자기학회 1995 韓國磁氣學會誌 Vol.5 No.5
An experiment was carried out to investigate the effect of Na₂O additive on the magnetic and physical properties of SrZn₂-W type hexagonal ferrite. The specimens were prepared by the conventional manufacturing methods without atmosphere control. It was found that the magnetic properties of SrOㆍ2ZnOㆍ8Fe₂O₃ are considerably improved on adding 1.5wt% Na₂O. The optimum condition of making magnet with suitable properties are as follows : chemical analysis composition: Sr²+_(0.852)Zn²+_(l.721)Na+_(0.301)Fe²+_(0.723)Fe³+_(15.703)O_(27) ; semisintering condition: 1300℃ × 1h in air; sintering condition: 1250℃ × 0.5h in air. The magnetic properties are: Jm= 0.390 T, Jr= 0.348 T, H_(cJ)= 133.7 ㎄/m, H_(cB)= 129.7 ㎄/m, (BH)max = 21.50 kJ/㎥, Tc=371℃, H_A= 1091.5㎄/m, K_A = 2.13 × 10^5J/㎥ and n_B= 31.8 μB.
Stochastic Geometry Analysis of Normalized SNR-Based Scheduling in Downlink Cellular Networks
Ohto, Takuya,Yamamoto, Koji,Kim, Seong-Lyun,Nishio, Takayuki,Morikura, Masahiro IEEE 2017 IEEE wireless communications letters Vol.6 No.4
<P>The coverage probability and average data rate of normalized SNR-based scheduling in a downlink cellular network are derived by modeling the locations of the base stations and users as two independent Poison point processes. The scheduler selects the user with the largest instantaneous SNR normalized by the short-term average SNR. In normalized SNR scheduling, the coverage probability when the desired signal experiences Rayleigh fading is shown to be given by a series of Laplace transforms of the probability density function of interference. Also, a closed-form expression for the coverage probability is approximately achieved. The results confirm that normalized SNR scheduling increases the coverage probability due to the multi-user diversity gain.</P>
An Ultrasonic Shape Recognition Considering Change of Ambient Atmospheric Pressure
Shinya Omori,Takayuki Yamamoto,Kozo Ohtani,Mitsuru Baba 제어로봇시스템학회 2009 제어로봇시스템학회 국제학술대회 논문집 Vol.2009 No.8
Recognition methods with an ultrasonic sensor are often utilized in situations where optical sensors cannotbe used or in objects which are hard to be identified by the approach based on the light. Among ultrasonic data, an ultrasound pressure data has the advantage of being able to acquire three-dimensional shape information with high resolution and with comparative ease by use of ultrasonic sensor array. The ultrasound pressure data is vulnerable to the change of the atmosphere pressure. Therefore, this paper proposed an ultrasonic shape recognition approach consideringchange of ambient atmospheric pressure. We designed and built a prototype shape recognition system with ultrasound pressure. From experimental results, it was shown that the proposed approach is effective for shape recognition withultrasound pressure data.
Tsukamoto, Kimihide,Ueno, Takayuki,Yamamoto, Keiichiro,Ohbuchi, Yoshifumi,Sakamoto, Hidetoshi Korean Society for Engineering Education 2010 공학교육연구 Vol.13 No.2
It is necessary for lower grade students to study the correct usage of tools as a base of the technical education for dismantling and assembling various machines. However, enough understanding has not been obtained though the usage of these tools when training first grade students. So, we started to develop a teaching text and materials within the students' practice curriculum based on the dismantling and assembly of all-terrain vehicle [ATV]'s, which is a very motivating for lower grade students. This practice makes the student learn both how to use the tools and the steering mechanism of cars through the dismantling and assembling of the ATV. It is possible to not only have the student learn about the knowledge obtained through the practice, but also they also acquire wider and deeper knowledge through making the text and teaching materials for the practice. The textbook and secondary educational materials of this practice curriculum were created in cooperation with a fifth grade student as part of their graduation research. As a result, an effective teaching and learning text and secondary educational material regarding manufacturing practice could be developed from the student's point of view. Making a teaching text and materials is effective for promoting the study and experience of engineering.
Tanaka, Hideyuki,Matsuoka, Yasutomo,Kawakami, Takuma,Azegami, Yasuhiko,Yamamoto, Masashi,Ohtake, Kazuo,Sone, Takayuki Council on Tall Building and Urban Habitat Korea 2019 International journal of high-rise buildings Vol.8 No.4
We performed calculations combining optimization technologies and Computational Fluid Dynamics (CFD) aimed at reducing wind forces and mitigating wind environments (local strong winds) around buildings. However, the Reynolds Averaged Navier-stokes Simulation (RANS), which seems somewhat inaccurate, needs to be used to create a realistic CFD optimization tool. Therefore, in this study we explored the possibilities of optimizing calculations using RANS. We were able to demonstrate that building configurations advantageous to wind forces could be predicted even with RANS. We also demonstrated that building layouts was more effective than building configurations in mitigating local strong winds around tall buildings. Additionally, we used the Convolutional Neural Network (CNN) as an airflow prediction method alternative to CFD in order to increase the speed of optimization calculations, and validated its prediction accuracy.
Han Kiwon,Song Hojin,Choi Chan Woong,Park Sangmi,Kang Yong Seok,Jung Kikyung,Lee Byung-Hwa,Takahashi Yoshimasa,Matsumura Takayuki,Yamamoto Akihiko,Kim Yang Jin,Jee Seung-wan,Kim Jaeok 한국독성학회 2020 Toxicological Research Vol.36 No.4
In 2017, the second national reference standard (NRS) for Gloydius snake venom was established to replace the first NRS for Gloydius snake venom. In connection with the second venom NRS, a candidate for the first NRS for Gloydius snake antivenom was produced in 2017. In this study, the qualification of the candidate was estimated and the potency was determined by a collaborative study. The potency (anti-lethal titer and anti-hemorrhagic titer) of the candidate was determined by measuring the capability of the antivenom to neutralize the lethal and hemorrhagic effects of the second NRS for Gloydius snake venom, which was calibrated against the regional reference standard for Gloydius snake antivenom established in 2006. Two Korean facilities contributed data from 20 independent assays. Subsequently, one foreign national control research laboratories participated in this collaborative study. The general common potency of the anti-lethal and anti-hemorrhagic titers was obtained from the results of a total of 25 tests performed at three facilities. According to the results of the present study, the candidate preparation showed good quality and is judged to be suitable to serve as the first NRS for Gloydius snake antivenom with the following potency: an anti-lethal titer of 3100 unit (U) (95% confidence interval 2991–3276 U) and anti-hemorrhagic titer of 3000 U (95% confidence interval 2849–3159 U). In conclusion, the first NRS for Gloydius snake antivenom was established in this study. This reference standard will be used routinely for quality control of a snake antivenom product by manufacturer in Korea, which also can be used for national quality control, including a national lotrelease test of the snake antivenom product.