A5101744519- Spacecraft Design and Technology
- Space Satellite Systems and Control
- Inertial Sensor and Navigation
- Astro and Planetary Science
- Satellite Communication Systems
- Cancer, Hypoxia, and Metabolism
- Ionosphere and magnetosphere dynamics
- Geophysics and Gravity Measurements
- Spacecraft and Cryogenic Technologies
- Spacecraft Dynamics and Control
- GNSS positioning and interference
- Epigenetics and DNA Methylation
- Ion-surface interactions and analysis
- Pancreatic function and diabetes
- Congenital limb and hand anomalies
- Advanced Graph Theory Research
- Planetary Science and Exploration
- Cancer-related gene regulation
- Erythrocyte Function and Pathophysiology
- Calibration and Measurement Techniques
- Diamond and Carbon-based Materials Research
- Aerodynamics and Acoustics in Jet Flows
- Fluid Dynamics and Turbulent Flows
- Indoor and Outdoor Localization Technologies
- Dupuytren's Contracture and Treatments
Tohoku University
2016-2025
Center for Global Health
2023-2024
National Center for Global Health and Medicine
2022-2024
Tohoku Institute of Technology
2024
Keio University
2022-2024
The University of Tokyo
2017
Art Institute of Portland
2017
Kyushu University
2006-2011
Rikkyo University
2008-2010
Tokuyama (Japan)
2005-2009
Three hundred and thirty feet in 265 patients with polydactyly of the foot were classified on basis ray involvement level duplication. Anatomic differences bony structures according to x-ray operative findings, external appearance involved digits, associated anomalies, familial incidence studied. In medial-ray polydactyly, bilateral occurrence was common, a higher frequency anomalies detected. Each even same duplication usually had different morphologic pattern. central-ray all except one...
There have been many studies on navigation systems in cislunar space. Many proposed a special system to be constructed around the moon, similar Global Navigation Satellite System (GNSS) Earth. In recent years, authors presented new method for providing simultaneous range measurement and clock synchronization. This paper presents experimental results performed two field radio tests using actual hardware. study aimed demonstrate GNSS–based transceiver communication capability built developed...
Metabolic pathways are plastic and rapidly change in response to stress or perturbation. Current metabolic profiling techniques require lysis of many cells, complicating the tracking changes over time after rare cells such as hematopoietic stem (HSCs). Here, we aimed identify key enzymes that define differences glycolytic metabolism between steady-state conditions murine HSCs elucidate their regulatory mechanisms. Through quantitative 13 C flux analysis glucose using high-sensitivity tracing...
Other than genetically engineered mice, few reliable platforms are available for the study of hematopoietic stem cell (HSC) quiescence. Here we present a platform to analyze HSC cycle quiescence by combining culture conditions that maintain with CRISPR-Cas9 genome editing system optimized HSCs. We demonstrate preculture HSCs enhances efficiency facilitating nuclear transport ribonucleoprotein complexes. For post-editing culture, mouse and human edited based on non-homologous end joining...
ALE-1, a micro-satellite created for the demonstration of artificial shooting stars, required orbital descent before mission execution due to safety aspects in orbit. ALE-1 utilized drag sail called SDOM (Separable De-Orbit Mechanism) passive de-orbit maneuver, which was successfully completed, lowering orbit from about 500 km down 400 km. This paper summarizes detailed history satellite operation and results maneuver during past three years. Although faced difficulty keeping desired...
Recent startups and university space activities extend to cis-lunar near-Earth interplanetary field. One of the biggest hurdles in those missions is orbit determination based on range measurements, while radio transmission reception capability becomes within small organizations' facilities. Also, about navigation space, conventional GNSS (Global Navigation Satellite System) real time positioning hardly available some alternative methods have been sought. The most straight forward approach be...
The ground test environment is established for rapid development and raising high operational reliability of micro-satellites. It aims to verify the attitude determination control system (ADCS) in hardware-in-the-loop simulation. In this research, performance simulator improved verified based on flight data real satellite. Space Robotics Laboratory (SRL) Tohoku University has developed two 50-kg-class Due a short term, verification required supporting ADCS. SRL Model-based Environment...
Radiometric calibration utilizing the Moon as a reference source is termed lunar calibration. It useful method for evaluating performance of optical sensors onboard satellites orbiting Earth. Lunar provides sufficient radiometric opportunities without requiring any special equipment, and suitable nano/microsatellites. This study applies to multispectral sensor, Ocean Observation Camera (OOC), on board microsatellite named Rapid International Scientific Experiment Satellite. Simulating...
Summary form only given. In this paper, we present an optical performance monitor that employs acousto-optic tunable filter (AOTF), which has previously been utilized as a wavelength channel counter for per-channel output power control in EDFA repeater. This monitor, features low cost, high reliability, and high-speed operations, can detect SNRs, levels per channel, the number of channels, information be used supervision repeaters.
Space Robotic Laboratory (SRL) of Tohoku University is currently developing a 50-kg-class Earth observation microsatellite “RISESAT”, and it planned to be launched in 2018. In addition the multiple scientific instruments, RISESAT equipped with laser transmission terminal “VSOTA” developed by National Institute Information Communications Technology (NICT), we will conduct optical communication demonstrations between low-Earth orbit ground station. VSOTA eliminated emitting direction control...
Microsatellites, weigh less than 100 kg attract attention due to recent growth of space business. Space Robotic Laboratory (SRL) Tohoku University is currently developing a 50-kg-class Earth observation microsatellite RISESAT, and it planned be launched in 2019. RISESAT equipped with 680 bands 4 m resolution multispectral system which world's highest performance regardless satellite size. To carry out the observation, has track ground target an accuracy 0.1°. In this paper, we propose...
This paper provides the thruster control approach for micro-satellites to realize autonomous orbit and attitude control. The Space Robotics Laboratory (SRL) of Tohoku University ALE Co. Ltd. are currently developing a micro-satellite called "ALE-2" generate artificial meteors. satellite is required keep sun-synchronous at altitude 375-400 km due operational safety mission constraints. ALE-2 equipped with High Density Cold Gas Jet System (HDCGJ) developed by Patchedconics, LLC Although...
In this paper, we propose the design of a double fail-safe attitude control system (ACS) architecture for safe artificial meteor release and show evaluation results verified by hardware-in-the-loop-simulator (HILS). ALE Co., Ltd. Space Robotics Laboratory Tohoku University developed 60-kg-class microsatellite ALE-1. ALE-1 can create on-demand meteors using gas-pressurized mass driver to small balls, which are source pellets meteors, commercial entertainment events scientific experiments in...
The interaction of low-energy multiply charged Arq + (q ≤ 7) ions with a solid Ne surface is experimentally studied. Desorption very large cluster Nen (n > 100) observed. size distribution smaller = 1–3) depends strongly on the charge state incident ion, whereas that larger exhibits no dependence state, indicating desorption due to kinetic sputtering. potential sputtering yield estimated by analyzing desorbed ions. results suggest ion mechanism, which known as induced electronic transitions,...
Fast tracking algorithm discussed in this paper is applied to star trackers for improving the performance of identification. Space Robotics Laboratory (SRL) Tohoku University has developed micro-satellites so far. Since it only a lost-in-space identification, attitude update rate limited up 1 Hz. It was implemented Philippines' 50 kg-class micro-satellite "DIWATA-1" released from International Station on April 2016. Although on-orbit evaluation showed good results enough output autonomously,...
Space Robotics Laboratory (SRL) of Tohoku University is currently developing a 50-kg-class Earth observation satellite "RISESAT". In this paper, we propose new ground-target tracking control algorithm and attitude system for RISESAT. The primal mission RISESAT multi-spectral the surface using 5 m GSD High-Precision-Telescope (HPT) with liquid crystal tunable filters. During an observation, HPT takes dozen images ground target by changing bands. General satellites push-broom cameras require...
The Rapid International Scientific Experiment Satellite (RISESAT) is a 50-kg-class Earth observation microsatellite that currently being developed at the Space Robotics Laboratory (SRL) of Tohoku University, with planned launch data in 2018. Intended to demonstrate cost-effective and reliable bus system, RISESAT features various scientific payload instruments from institutions organizations around world. Among payloads are Very Small Optical Transponder (VSOTA), compact, dual-band (980 nm,...
ALE project is a micro-satellite with the mission objective of artificial generation shooting star. The first satellite this (ALE-1) launched in January 2019 at an orbit approximately 500 km altitude. There are manned missions International Space Station altitude lower than this, therefore ALE-1 needs to be lowered before actual start. exist mechanical systems that allow passive lowering satellites by accelerating natural decay use thin polyimide film as drag sail. Previously such were only...
This paper presents a low earth orbit control sequence for microsatellite using thruster and its evaluation. The Space Robotics Laboratory (SRL) ALE Co.,Ltd. are currently developing the ALE-3 with mission of artificial generation meteor. Since meteor ejection will be performed at an altitude about 400 km or lower, perform descent from 600 10N thrusters. Due to limited amount propellant loaded onto satellite, efficient operation is important achieve target orbit. In this study, we propose...
Magnetometer-based attitude determination algorithm has been studied for decades owing to its advantages. This article aims develop and fine-tune the magnetometer-based method by introducing two new observation models extended Kalman filter (EKF). The optimization techniques were purposed increase accuracy improve convergence. Monte Carlo simulation, including disturbances a moment of inertia estimation error, was held evaluate performance each EKF innovation vector significant effect...
ISLAM, S., OKA, I. and FUJITA, S. Anatomical Study of Preaxial Polydactyly in 158 Hands. Tohoku J. Exp. Med., 1992, 168 (3), 459-466 - polydactyly is a common congenital hand anomaly. Here 138 patients with duplicated thumbs, new classification this anomaly was done from analysis radiographs operation records. Initially all the thumbs were arranged into Type I to VII on basis radiological extent bifurcation. Appendage type noted as separate entity. IV found most had 53 (33.6%) involved. But...
Absolute sputtering yields from the surface of solid Ne by low energy He+ and Arq+ (1 ≥ q 6) impact are measured. Very large (300 atoms/ion for 1 keV impact, 3000 1keV Ar+ impact) have been observed. A significant dependence on chage state, i.e. potential energy, incident ion has not observed because it is estimated to be much smaller than that kinetic sputtering, which suggests mechanism similar those known electron- photon-stimulated desorption processes.