60 research outputs found
Quantum-inspired machine learning for exponentially big neural data analysis
No full textMachine learning algorithms specialized for neural data have allowed the extraction of information encoded in the brain. As an example, in previous studies, the images human subjects see were reconstructed from their brain activity measured via functional magnetic resonance imaging (fMRI) [1]. However, the application of those machine learning algorithms to high-resolution fMRI data, which may become mainstream in the near future, is limited due to their high computational cost. To solve this problem, scalable machine learning algorithms are being designed by utilizing computational techniques developed in the field of quantum computation [2,3]. In this report, taking one of the popular statistical methods, principal component analysis (PCA), as an example, we show that machine algorithms can be approximated with the use of such quantum-inspired techniques. The computational time and approximation performance of quantum-inspired PCA are demonstrated. The main results of this report have been presented in a previous paper by the author [3].
References
1G. Shen, T. Horikawa, K. Majima, Y. Kamitani, PLOS Computational Biology, Volume 15, e1006633 (2019).
2E. Tang, Physical Review Letters, Volume 127, 060503 (2021).
3N. Koide-Majima, K. Majima, Neural Networks, Volume 135, 55–67 (2021).QUANTUM INNOVATION 2021conference objec
Towards the year 2022, the memorial 314th year of SEKI Takakazu II (Study of the History of Mathematics 2021)
No full textTo activate the study on the history of Mathematics in Japan, the author proposed to organize some memorial events for the year 2022, the 314th year after his death of SEKI Takakazu (?-1708), the 300th anniversary of TAKEBE Katahiro's “Tetsujjutsu-Sankei”, and so on. We propose to build a stone monument near his tomb in Jorinji Temple, because of his significant work concerning to Pi.数学，数学教育，数学史の教育・研究の活性化のために2022年に関孝和314年祭開催等を（建部賢弘が「綴術算経」の序文を書いてから300年の記念の年でもあり）提唱している．関先生の円周率の近似計算に関する世界的な業績を記念して石碑を墓のある浄輪寺に設置することを思いつき準備していることを報告する
Some Remarks on the approximate calculation of Pi by SEKI Takakazu and TAKEBE Katahiro : on the occasion of the 314th anniversary of SEKI Takakazu (Study of the History of Mathematics 2022)
No full textTo activate the study on the history of Mathematics in Japan, the author proposed to organize some memorial events for the year 2022, the 314th year after his death of SEKI Takakazu(?-1708), the 300th anniversary of TAKEBE Katahiro’s “Tetsujjutsu-Sankei”, and so on. In this time, we give some remarks on the approximate calculation of Pi by SEKI Takakazu and TAKEBE Katahiro. We also mention the work of KAMATA Yoshikiyo on the same problem. , especially he gave the length of circumscribed. polygon with it of inscribed polygon. We claim that Seki and Takebe used better method giving lower and upper bounds of Pi than Kamata did. In this point of view, we criticize some observation on given by hisitorian on science about mathematicians of Edo era. of Japan. From this episode, we learn a lesson on mathematics education: maticians should give explanation easy to nderstand on their works to the society and mathematics education should be done iin a reasonable way n the society.数学，数学教育，数学史の教育・研究の活性化のために2022年に関孝和314年祭開催等を（建部賢弘が「綴術算経」の序文を書いてから300年の記念の年でもあり）提唱していた．今回は，関孝和と建部賢弘の円周率の近似計算に関するいくつかの注意を与えておく．鎌田俊清が円周率の近似計算において内接正多角形の周長とともに外接正多角形の周長も与えられていることに言及し，円周率の下界と上界を与えるよりよい方法を，関や建部は使っていることを主張する．この観点から, ある科学史家の日本の江戸時代の数学者についての観察を批判する．この逸話から数学教育についての教訓を得る：数学者はその成果をわかりやすく社会に伝えるべきであり、社会ではある程度の数学力を備えるべく数学教育が必要である
Outcome of Transfibular Ankle Arthrodesis with Ilizarov Apparatus
No full textBackground: Both transfibular ankle arthrodesis with fibular onlay grafting and ankle arthrodesis using the Ilizarov apparatus have resulted in acceptable fusion rates. This study analyzed outcomes in our practice for all patients who underwent transfibular ankle arthrodesis with fibular onlay grafting using the Ilizarov apparatus. Materials and Methods: A retrospective review was conducted of all patients who experienced severe ankle pain associated with osteoarthritis, rheumatoid arthritis, talar nectosis, or septic arthritis and underwent transfibular ankle arthrodesis with Ilizarov apparatus between 1995 and 2010. Postoperative clinical outcomes were evaluated for 42 consecutive patients (43 feet) who received primary or revision ankle arthrodesis using the Ilizarov technique at two centers. Mean duration of follow-up was 4.1 years (range, 1.5-13 years). Outcomes were assessed using the ankle-hindfoot scale of the American Orthopaedic Foot and Ankle Society. Results: All ankles fused successfully. Mean clinical outcome improved significantly from 36.2 (range, 8-64) preoperatively to 77.4 (range, 0-86; p < 0.05) postoperatively. Conclusion: Transfibular ankle arthrodesis using the Ilizarov external fixation system and fibular onlay strut grafting can achieve 100% bony union and lead to general improvements in clinical outcome. Forefoot stabilization with a forefoot ring achieves rigid stabilization resulting in a shorter duration of external fixation
Towards single electron transistor-based photon detection with microplasma-enabled graphene quantum dots
No full textSingle-electron transistors (SETs) represent a new generation of electronic devices with high charge sensitivity, high switching speed, and low power consumption. Here a simple and controlled fabrication of graphene quantum dot (GQD)-based SETs for photon detectors has been demonstrated. The plasma-synthesized GQDs exhibit stable photoluminescence and are successfully used as the Coulomb islands between heteroepitaxial spherical-gold/platinum (HS-Au/Pt) nanogap electrodes. The as-fabricated GQD-SETs enable photon detection with 410 nm excitation owing to the ability of GQDs to generate photoluminescence emission.Full Tex
G801 Transport Coefficients and Orientational Distributions of a Dilute Colloidal Dispersion composed of Hematite Particles : Analysis for an Applied Magnetic Field parallel to the Angular Velocity Vector of a Shear Flow(2)
No full textShaking-Table Test on a Multi-Story Continuous Vibration-Control System Employing Pulley Amplification Mechanism
No full textThis study proposes an innovative passive vibration-control system, named the Pulley Damper Multi-story System (PDMAS), which incorporates pulley tackles installed at multiple stories in the successive stories to amplify inter-story displacement. This configuration significantly enhances the energy absorption efficiency of the linked dampers at the middle of the cable by utilizing the cumulatively amplified story displacements via a continuously stretched cable across the entire structure. The proposed system shows notable potential for controlling responses induced by higher vibration modes by customizing the wire installation layout. The aim of this study is to introduce PDMAS and to investigate its seismic-mitigation effectiveness. As a primary investigation of this new system, comparative experimental studies were conducted through shaking-table tests on nine specimens featuring various cable layouts optimized for the first and second structural vibration modes, with or without dampers, under harmonic waves, white-noise waves, and simulated seismic waves. The experimental results demonstrate that the PDMAS effectively accommodates the cumulative amplified story displacement across the structure to match theoretical damper values. Furthermore, the specimens employing PDMAS with a wire layout optimized for the first structural mode reduced both acceleration and displacement by nearly half compared to specimens without PDMAS. Doi: 10.28991/CEJ-2025-011-01-02 Full Text: PD
Development of Vibration Control Structure on Suspended Ceiling Using Pulley Mechanism
No full textA suspended ceiling system (SCS) is one of the most fragile and non-structural elements during earthquakes. However, effective seismic protection technologies for enhancing the suspended ceiling system have not been developed other than the steel bracing system. An innovative passive vibration control system is proposed in this paper, which equipped a damper-employed pulley amplification mechanism into the indirect suspended ceiling system, named the pulley–damper ceiling system (PDCS). Theoretical formulation and the detailed information on the system were presented first. In addition, a new rotational damper composition consisting of a non-linear viscous damper was developed to follow the large wire-cable stroke. Six types of the full-scale ceiling specimens of a 15.6-square meter area with different configurations were constructed for the preliminary experiments to evaluate the seismic performance and feasibility of PDCS under simulated earthquake motions. The comparative results of the shake table test demonstrated that the application of PDCS is capable of controlling both displacement and acceleration of the ceiling panels. This study also presents the nonlinear time history analyses by modeling a wire-cable as an equivalent truss element to transmit the relative displacement of the ceiling system to the damper. The analytical model accurately simulated the dynamic behavior of PDCS
G801 Transport Coefficients and Orientational Distributions of a Dilute Colloidal Dispersion composed of Hematite Particles : Analysis for an Applied Magnetic Field parallel to the Angular Velocity Vector of a Shear Flow(1)
No full textTransport Coefficients and Orientational Distributions of a Dilute Colloidal Dispersion Composed of Hematite Particles: Analysis for an Applied Magnetic Field Parallel to the Angular Velocity Vector of Simple Shear Flow
No full text- …
