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The study deals with an above-knee prosthesis that allows amputees stairs ascending/descending with no external energy sources. Our previous study certified that the employed hydraulic system propelled by the antagonistic actions of knee and ankle joints enables stairs ascending/descending as well as level walking. The paper deals with the subsequent developments to get amputee's walking gait close...
In this study, zero CO2 emission high efficiency power generation system based on Magnetohydrodynamic (MHD) generator was proposed. Proposed system was driven by combustion product of fossil fuels burned with pure oxygen. Such combustion system has inherent advantages as 1) high temperature combustion gas and 2) simple components of combustion gas. The former has possibility to achieve high thermal...
Low Ohmic contact for p-type GaN (pGaN) has been of great importance for various applications including light emitting diodes and nitride based power devices. Although a low contact resistance (ρc) of the order of 10−6 Ωcm2 can be obtained with air-annealed Au/Ni electrodes, the hole transport relies on NiO islands inhomogeneously formed between the Au and the pGaN surface, giving concerns in long...
For coherent detection using multi-level modulation formats, we demonstrated small responsivity imbalance of the InP-based p-i-n photodiode array monolithically integrated with the 90° hybrid consisting of 2 × 4 and 2 × 2 multimode interference structures and a 45° phase shifter. Responsivity imbalance of the In-phase and Quadrature channels was less than ±0.2 dB over the C-band by the adoption of...
We have realized patterned Ge-on-Insulator wafers by large-scale layer transfer technology. In conjunction with low-temperature bonding and patterned Epitaxial Lift-Off (ELO) technique, high quality Ge layer transfer was achieved in full-wafer scale.
InP-based balanced photodiodes monolithically integrated with the 90° hybrid consisting of multimode interference structures (MMI) by the butt-joint process were demonstrated for the first time. The high responsivity of 0.14 A/W and wide 3-dB bandwidth of 22 GHz at a low reverse bias voltage of 1.6 V were successfully achieved.
Acoustic cavitation plays a key role in several fields including therapeutic medicine and cleaning. Meanwhile, acoustic cavitation is a hazardous phenomenon due to the damage to targets irradiated by ultrasound such as normal cells in the human body. Therefore, it is important to control cavitation. An accurate technique for measuring the amount of generated cavitation with the aim of its control...
A caster walker is a supporting frame with casters and wheels under its legs. This tool is regularly utilized as a life support tool or a walking rehabilitation tool in hospitals, nursing homes and individual residences. This device easily moves thanks to its wheels and casters. However falling accidents often happen when it moves without users. The falling accident is very serious problem and one...
We have proposed a leg-shaped haptic simulator (Leg-Robot) that provides an environment for young physical therapist to learn rehabilitation techniques or diagnosis techniques with haptic information which mimics a real patient with abnormal motor function, for example, stroke or spinal cord injury. In previous studies, we also proposed a control method to develop a clonus-like movement for the Leg-Robot...
The robots are expected to perform daily tasks in human environment. To realize such a robotic system, it is necessary to develop intelligent robotic technology to observe the environmental condition and to accomplish tasks. In practice, it is required to develop a robot system which is robust against changes of tasks and environments. This study aims to develop such a robust robot system by using...
We have been investigated a technique for quantitatively measuring generated acoustic cavitation. Recently, several applications that use cavitation have been developed in the fields of medicine, cleaning, and sonochemistry. However, cavitation can also cause undesired damage, for example, to normal cells in the human body and cleaning objectives. Therefore, the amount of generated cavitation must...
In this project, we have developed virtual haptic simulators that can simulate several kinds of abnormal movements and haptics of the disabled people. In the previous report, we proposed a leg-shaped robot (Leg-Robot) with a Compact MR Fluid Clutch (CMRFC) to establish highly safe human-machine co-existent system, and control methods to realize several kinds of abnormal symptoms. In this paper, we...
Recently the needs for medical rehabilitation support systems are increasing in Japan, which use robot technology and virtual reality technology. Applying these technologies make efficient medical rehabilitation outcome. We have developed 6-degrees-of-freedom (DOF) upper extremity exercise system to evaluate synergy pattern an to exercise of upper extremity of stroke patients, named ??Robotherapist??...
This paper presents a 0.13 um BiCD process (BiCD-0.13) based on a 0.13 um standard CMOS technology with a superior Deep Trench Isolation(DTI). Merits of using DTI are to improve breakdown voltage, reduce parasitic transistor actions and increase area density, compared with Junction-Isolation. We simulated the stress and the device characteristics, and optimized the parameters of DTI design and process...
A measurement of temperature of plasmas is important to analyze the operation conditions in a channel of a magnetohydrodynamic (MHD) generator and an MHD accelerator. The MHD generator is expected as a highly effective device for an electrical power generation system. For the capability in the high output power density, the MHD generator is applied to a power supply for an application of a scramjet...
Rehabilitation for upper limbs is important for the elderly people, the stroked patients and so on. In recent years, the needs for rehabilitation support systems are increasing, which use robot technology, virtual reality technology and neuroscience. In this paper we present about a development of evaluation system of the motor function for upper limbs using 3-D rehabilitation Robot ldquoEMULrdquo...
Strengthening muscle force by training, e.g., an isokinetic exercise is used widely used method in the rehabilitation medicine and sports medicine. However, many conventional isokinetic exercise machines cannot be used safely and easily. In this study, we developed an isokinetic and iso-contractile exercise machine, named ldquoMEM-MRBrdquo, using an ldquoMR brakerdquo. This brake includes MR fluid...
The hybrid control system, which is a combination of cascade control and local control, is proposed as a method to compensate power fluctuations caused by load and renewable energy sources in a microgrid using distributed power generation systems (DGs). When energy storage system (ESS) such as EDLC is used in the microgrid to compensate power fluctuations, its state of charge (SoC) should be controlled...
In this study, we propose a leg-robot with a compact MR fluid clutch (CMRFC) to demonstrate haptic control of abnormal spastic movements of brain-injured patients. This system can be used in the practical training for trainees of physical therapy. In this paper, basic structure and characteristics of the leg-robot are explained. Then, we suggest a control method to reproduce clonus-like movements,...
Many kinds of actuator-based (active type) haptic devices have developed and utilized as rehabilitation robots. These systems have great advantages for rehabilitative activities, for example assistive forces and so on. However, from the view point of safety, we have a room to consider utilizing brake-based (passive type) haptic devices as rehabilitation-tools. The effects and roles of active / passive...
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