A5004119695- Nonlinear Dynamics and Pattern Formation
- Neural Networks and Reservoir Computing
- Chaos control and synchronization
- Optical Network Technologies
- Semiconductor Lasers and Optical Devices
- Photonic and Optical Devices
- Chaos-based Image/Signal Encryption
- stochastic dynamics and bifurcation
- Advanced Fiber Laser Technologies
- Neural dynamics and brain function
- Sarcoma Diagnosis and Treatment
- Advanced Memory and Neural Computing
- Quantum optics and atomic interactions
- Orthopaedic implants and arthroplasty
- Plant and animal studies
- Immune Cell Function and Interaction
- Neural Networks and Applications
- Bone Tissue Engineering Materials
- Complex Systems and Time Series Analysis
- Semiconductor Quantum Structures and Devices
- Random lasers and scattering media
- Orthopedic Infections and Treatments
- Advanced Optical Sensing Technologies
- Quantum Information and Cryptography
- Urinary Bladder and Prostate Research
Saitama University
2016-2025
Tsukuba Medical Center Hospital
2013-2022
Mazda Motor Corporation (Japan)
2022
The University of Tokyo
2022
University of Yamanashi
2022
National Institute of Information and Communications Technology
2022
Nagoya Medical Center
2022
Kawasaki Medical School
2016-2017
Sanden (Japan)
2017
Mitsubishi Research Institute (Japan)
2012-2016
We numerically investigate reservoir computing based on the consistency of a semiconductor laser subjected to optical feedback and injection. introduce chaos mask signal as an input temporal for perform time-series prediction task. compare errors task obtained from with those other digital analog masks. The performance can be improved by using due complex dynamical response.
In the emerging Internet of things cyber-physical system-embedded society, big data analytics needs huge computing capability with better energy efficiency. Coming to end Moore’s law electronic integrated circuit and facing throughput limitation in parallel processing governed by Amdahl’s law, there is a strong motivation behind exploring novel frontier post-Moore era. Optical fiber transmissions have been making remarkable advance over last three decades. A record aggregated transmission...
The rapidly increasing computational demands for artificial intelligence (AI) have spurred the exploration of computing principles beyond conventional digital computers. Physical neural networks (PNNs) offer efficient neuromorphic information processing by harnessing innate power physical processes; however, training their weight parameters is computationally expensive. We propose a approach substantially reducing this cost. Our merges an optimal control method continuous-time dynamical...
Porous blocks of calcium hydroxyapatite ceramic were evaluated as delivery systems for the sustained release antibiotics. We tested gentamicin sulphate, cefoperazone sodium, and flomoxef sodium in powder form placed a cylindrical cavity blocks, using vitro studies elution vivo rats. Gentamicin sulphate gave maximum concentration within first week, which gradually decreased but was still effective at 12 weeks, when 70% antibiotic had been released. Even this stage from 75 mg dose five times...
We report 60 benign bone tumours treated by resection and curettage followed the implantation of calcium hydroxyapatite ceramic (CHA). After follow-up six to months (average 36), no patient had local recurrence tumour or any adverse effects from implants. In almost all cases radiography showed that CHA was well-incorporated into host bone, with new formation in around CHA. Corrective remodelling deformed normal fracture healing suggested there turnover presence Histology biopsies seven...
Ceramics have many properties which might make them suitable alternatives to bone grafts. This present study was done find a biodegradable porous ceramic for human replacement. Three different ceramics (calcium aluminate, calcium hydroxyapatite and tricalcium phosphate), with interlinked pores of two size ranges (150 210 micron), were implanted into the skulls rats rabbits up six months; interaction surrounding bone, is virtually devoid marrow, then assessed. The caused no adverse biological...
We experimentally demonstrate random bit generation using multi-bit samples of bandwidth-enhanced chaos in semiconductor lasers. Chaotic fluctuation laser output is generated a with optical feedback and the chaotic injected into second to obtain intensity signal bandwidth enhanced up 16 GHz. The converted an 8-bit digital by sampling oscilloscope at 12.5 Giga per (GS/s). Random bits are bitwise exclusive-OR operation on corresponding its time-delayed signal. Statistical tests verify...
We experimentally demonstrate fast physical random bit generation from bandwidth-enhanced chaos by using three-cascaded semiconductor lasers. The is obtained with the standard bandwidth of 35.2 GHz, effective 26.0 GHz and flatness 5.6 dB, whose waveform used for generation. Two schemes single-bit multi-bit extraction methods are carried out to evaluate entropy rate maximum rate. For generation, at 20 Gb/s sequences. 1.2 Tb/s ( = 100 GS/s × 6 bits 2 data) equivalently achieved sequences...
We propose a secure key distribution scheme based on correlated physical randomness in remote optical scramblers driven by common random light. The security of the depends practical difficulty completely observing phenomena. describe particular realization using synchronization semiconductor lasers injected with light randomly varying phase. experimentally demonstrate feasibility over distance 120 km.
Photonic reservoir computing is a new paradigm for performing high-speed prediction and classification tasks in an efficient manner. The major challenge the miniaturization of photonic need use integrated circuits. Herein, we experimentally demonstrate using circuit with semiconductor laser short external cavity. We propose method to increase number virtual nodes delayed feedback node intervals outputs from multiple delay times. perform time-series nonlinear channel equalization circuit....
We experimentally investigate delay-based photonic reservoir computing using semiconductor lasers with optical feedback and injection. apply different types of temporal mask signals, such as digital, chaos, colored-noise the weights between input signal virtual nodes in reservoir. evaluate performance by a time-series prediction task for signals. The chaos shows superior than that digital However, similar errors can be achieved Mask signals larger amplitudes result better all range amplitude...
Reinforcement learning involves decision making in dynamic and uncertain environments constitutes an important element of artificial intelligence (AI). In this work, we experimentally demonstrate that the ultrafast chaotic oscillatory dynamics lasers efficiently solve multi-armed bandit problem (MAB), which requires concerning a class difficult trade-offs called exploration-exploitation dilemma. To MAB, certain degree randomness is required for exploration purposes. However, pseudorandom...
We propose a scheme for reservoir computing using multiple semiconductor lasers with optical feedback arranged in parallel on photonic integrated circuit, and we investigate the performance of numerically. The virtual nodes are obtained from temporal waveforms outputs lasers. test chaotic time-series prediction task, memory capacity, nonlinear channel equalization task to computing. found that our outperforms single laser delay times. Large capacity can also be Finally, effect parameter...
Signal transducer and activator of transcription 3 (STAT3) is known to have an important role in cytokine growth factor signaling pathways. In various types human malignant tumors STAT3 has been shown be constitutively activated due aberrant production cytokines factors. We examined the presence activation its association with pathological features clinical outcome renal cell carcinoma cases.We 48 paraffin embedded specimens corresponding nonneoplastic kidney tissues for status on...
The consistency of a nonlinear system's response to repeated complex waveform drive signal is an important consideration in classical and quantum systems as diverse lasers, neuronal networks, manufacturing plants. We show from different characteristic waveforms that there typically optimal amplitude for the most consistent response; internal noise sources dominate small driving while deterministic system nonlinearity reduces large amplitudes. test this general concept its measurement...
Abstract We have developed a new delivery system for sustained release of an anticancer drug ( cis ‐platinum) by enclosure into blocks porous calcium hydroxyapatite ceramic. The slow this from was confirmed in vitro experiments. When implanted normal back muscle, or the tibia, ‐platinum observed during 12‐week period after implantation. diffusion rate blood and other organs (liver, kidney, brain) less than 10% that at site. This placed experimental tumors mice also showed uniform more 3...
It is shown that broadband chaos suitable for fast nondeterministic random-bit generation in small devices can be achieved a semiconductor laser with short external cavity. The design of the device based on theoretical model by amplification microscopic noise. Moreover, it demonstrated bit sequences passing common tests statistical randomness at rates up to 2.08 Gbits/s generated using on-chip lasers monolithically integrated cavity, amplifiers, and photodetector.
Random number generators are essential for applications in information security and numerical simulations. Most optical-chaos-based random produce bit sequences by offline post-processing with large optical components. We demonstrate a real-time hardware implementation of fast physical generator photonic integrated circuit field programmable gate array (FPGA) electronic board. generate 1-Tbit evaluate their statistical randomness using NIST Special Publication 800-22 TestU01. All the...
Photonic neural networks have significant potential for high-speed processing with low latency and ultralow energy consumption. However, the on-chip implementation of a large-scale network is still challenging owing to its scalability. Herein, we propose concept photonic field implement it experimentally on silicon chip realize highly scalable neuro-inspired computing. In contrast existing networks, spatially continuous that nonlinearly responds optical inputs, high spatial degrees freedom...
The efficacy of locally implanted antibiotic-calcium hydroxyapatite ceramic composites was investigated for the treatment experimentally produced, implant-related osteomyelitis in rats. High concentrations antibiotics were detected at site infection and bacteria eradicated without removal metal implants. Parenteral surgical debridement, alone or combination with antibiotic-impregnated acrylic bone cement, all failed to eradicate infections.