This study has been examined TMD using a leaf spring which is usually used in railway vehicle or cargo truck. In a first step of the study, the design indexes of leaf spring to apply for TMD was examined by the time history response analysis. As a result,the study investigated the specification of leaf spring for actual TMD. In the case of the design of coil spring, it was very difficult to be realized a practical used spring unit because of a manufacturable limitation of wire rod. However, it was confirmed that the design for TMD of the structure with long period is enough available by using leaf spring as a spring unit, considering properly the shape size including thickness of leaf spring and the maximum displacement of TMD.

View full abstract

This paper presents a controller design method for reaction wheel in order to improve the behavior at its zero-crossing. The controller uses the friction state observer of LuGre model which presents the friction behavior well. The control law which uses an observer of LuGre model uses the condition of the strictly positive real of the controller. By introducing the generalized Kalman-Yakubovich-Popov Lemma, the control gain is determined efficiently. The target frequency and the actual frequency of its zero-crossing are different. Then Kalman-Yakubovich-Popov Lemma is possible to design the control law according to the frequency range. The validity of the presented method is demonstrated by some numerical analyses.

View full abstract

In recent years, the material which has negative mass characteristics, called meta-material, attracts attention. Mast studies of the meta material have focused on the applications using the characteristic. This report is an attempt to make clear the fundamental vibration characteristic of the meta material. The free vibration of the one degree of freedom system with a negative mass are analyzied. The effects of the negative mass upon the nutural frequency are examined. It is shown that a free vibration solution may became unstable. The condition of stiffness and damping to make the free vibration solution stable is discussed.

View full abstract

This paper discusses an estimation of unmeasured auto frequency response function (FRF) based on maximum likelihood method. Moreover, the Reliability Factor for evaluating an effect of random noise in unmeasured auto FRF is introduced. The authors have proposed the method by using additional masses that are attached to an unmeasured point of a target structure. Maximum likelihood method is used to reduce the effect of the random noise that is included in the measured cross FRFs since the noise influence the accuracy of the estimated auto FRF. The validity of the proposed method is verified by comparing the FRFs of a beam structure obtained by maximum likelihood method and impact testing using an impulse hammer.

View full abstract

In this paper, the effects of a crack on the dynamic behaviour of structures are examined. First, the dynamic behaviours of cantilever beams with various depth, width and position are obtained experimentally. Next, the dynamic behaviours are calculated by the finite element method. As a result, the natural frequency is lower when the crake is deeper, wider and position is lower. The damping ratio is independent of depth, width and position of the crack.

View full abstract

For thin steel plates, which are used in many industrial products including those of the automobile industry, we have proposed a magnetic levitation control system and confirmed its realization by means of a digital control experiment. However, the use of a limited number of electromagnets cannot suppress static deflection and high-order-mode elastic vibration, which are characteristics of a flexible magnetic material. To solve this problem, we have proposed a hybrid levitation control system for thin steel plate using the magnetic force generated by permanent magnets, which have no operational costs. In this study, we attempt to determine the optimal placement of permanent magnets to reduce the deflection of a thin steel plate under the generated magnetic field. To verify the usefulness of optimal placement of the permanent magnets, experiments concerning deflection were performed on a magnetically levitated thin steel plate. In this study, we attempt to determine the optimal gap, placement and number of permanent magnets of permanent magnets that reduces the deflection.

View full abstract

The feasibility of multiple electrostatic suspension is demonstrated experimentally. The concept of the proposed suspension system is to suspend multiple floators with a single power amplifier. According to the structure of systems, they can be divided into series-connected systems or parallel-connected systems. The controllability of each system was previously analyzed, and the conditions to be controllable were shown. To test the analytical results, 1-DOF suspension systems were fabricated, and they composed a parallel-connected double electrostatic suspension system. This paper showed a basic model of proposed system, the controllability, and the realization of double electrostatic suspension with the fabricated suspension system.

View full abstract

With the increasing use of the International Space Station, humans have more opportunities to work in space. In space, a mobility device that operates efficiently is needed. In this research, a mobility system called the "Tether Space Mobility Device" (TSMD) is proposed. In general, a tether is a cable or wire rope. TSMD has a mechanism that enables the tether to move an object. In this study, we designed the prototype of TSMD and produced it. Two-dimensional microgravity is duplicated by the air bearing and the flight-table, the fundamental experiments of TSMD are performed. Then motion of TSMD is investigated. Therefore utility of TSMD is discussed.

View full abstract

A wind-tunnel system for spinning body has been proposed to measure hydrodynamic forces acting on the body. In the proposed system, the body is suspended and rotated by electromagnets. The forces are measured from the control signal for suspension. In the conventional apparatus, eight electromagnets were placed around the wind-tunnel. An optical displacement sensor was used to detect the three-dimensional positions of the body. Stable suspension and three-dimensional positioning of the body were achieved. However, the conventional apparatus has some problems. In this paper, a new wind-tunnel using magnetic suspension to improve such problems is fabricated. Stable suspension using fabricated apparatus is achieved.

View full abstract

This paper treats a relay-feedback mass measurement system that uses a relay with hysteresis and feedback the velocity of the object. A new apparatus is fabricated for precise measurement, in which a pair of plate springs are used for suspending the object without friction. The effect of these springs on mass estimation is investigated analytically. An estimating equation including this effect is derived. Experiments carried out with the apparatus demonstrates that the derived estimating equation is valid.

View full abstract

Reduction of seismic response of house is an important problem for aseismic design. In this paper, small size damper with silicon oil is developed for reduction of seismic response of two-story house. For reduction of seismic response of two-story house, an oil damper is connected to the ceiling of the first floor and the foundation. Resonance curves are obtained for some numbers of dampers. Peak responses in resonance curves are focused on. Peak amplitude ratio for the first vibration mode are obtained. It is found that the peak responses are reduced when dampers are used.

View full abstract

A reduction system of seismic response for small structure installed inside buildings was developed using friction bearings. In this paper, dynamic behavior of small reduction system on seismic response using friction bearing was investigated by statics and vibration tests. Natural period between observed and theoretical value is almost comparable. The peak response amplitude decreases 80% compared to input wave, and going to large of radius of concaves of spherical plat, the decrease rate of peak amplitude is larger.

View full abstract

Behavior of an elastic rod which is located in swirling flow is experimentally investigated. The experimental apparatus consists of a vertical elastic rod the tip of which is put in swirling flow in a circular cylinder. The experimental results demonstrate that two types of unstable whirling motion occur. From shapes of trajectories of the elastic rod and Strouhal numbers, the unstable motions originate from different mechanisms.

View full abstract

When wind flows through slats of a blind at the window, sometimes self-excited torsional vibration occurs with a large noise. This report investigates effects of some parameters on the vibration by using an experimental apparatus consisting of two acrylic plates hung by metal wires. Each plate has two degrees of freedom corresponding to translational and torsional motions. Experimental results show that torsional motion is predominantly observed when self-excited vibration occurs, and that bigger vibration is induced when the two plates are located closer to each other. In addition, we show that vortices leave from the plates by visualizing flow.

View full abstract

This paper discusses the mechanism of oscillation of a falling water sheet. We show the relation between the sheet configuration and the pressure variation in the air behind the sheet using an experimental apparatus. Taking into account this relation, or more precisely, assuming squeeze action on the air in an enclosed chamber, we derive a simplified model and obtain instability thresholds.

View full abstract

In late years, large scale earthquakes are occuring in the world. Then, control of seismic response of house is important for protection from destructive earthquakes. In this paper, two story houses are focused on and oil dampers of some shapes are proposed. Oil damper is connected to the ceiling of the first story and the foundation. The spherical damper, the drilling spherical damper, the crater spherical damper, the finned spherical damper with silicon oil are proposed. The effectiveness of the dampers is examined by experiment and simulation. It is concluded that the peaks of the resonance curve are reduced when dampers are used.

View full abstract

Magneto-Rheological fluid (MRF) is known as one of highly functional materials, and apparent viscosity of MRF can be varied in accordance with the applied magnetic field strength. But the sedimentation of the magnetic particles of MRF will result in unsteady dynamic behaviors of the MR devices. In order to reduce the sedimentation of the magnetic particles in MRF, Magneto-Rheological grease (MRG) was developed. MRG can reduce the sedimentation of magnetic particles, and its rheological property can also be varied in accordance with the applied magnetic field strength. In this paper, the properties of MRG were examined and MRG was adapted to a cylindrical damper. The typical properties of MR damper using MRG were studied experimentally.

View full abstract

In recent years, many houses were destroyed in destructive earthquakes in the world. It is important to control the vibration for protection from destruction of house. In this paper, two story houses are focused on and a new type of damper using silicon oil and permanent magnet is proposed. Oil and magnet damper is connected to the ceiling of the first story and the foundation. The effectiveness of the damper is examined experimentally. It is concluded that the peaks of the response curves are reduced when damper is used.

View full abstract

In recent years, massive earthquake disasters have happened in the world. Many houses are damaged and collapsed. Vibration control is important to protect from destruction of houses. In this paper, a new type of magnet damper for two story houses is developed. Magnet damper is connected to the ceiling of the first story and the foundation. The effectiveness of the damper is examined experimentally. It is concluded that the peaks of the resonance curves is reduced when dampers are used.

View full abstract

This paper presents the results of experimental and analytical studies of the performance of a particle damper using metallic hollow spheres in a vertically vibrating system. The metallic hollow sphere is made of steel and the density is almost the same as that of plastics. It is expected that the particle dampers with metallic hollow spheres can be applied in extreme temperature environment. The dynamics of the damper is solved by means of the Discrete Element Method (DEM). The validity of this numerical method is examined by comparison with the experimental results. It is shown that the mass ratio and the cavity dimensions influence the damping performance.

View full abstract

Many nonlinear characteristics are observed in structures. Friction characteristic is a common nonlinear characteristic. When the structures with friction characteristic are subjected to seismic excitations, the responses are reduced because vibration energy is absorbed. In this paper, relation between the maximum response of the structures and absorbed energy by the friction characteristic subjected to seismic excitations is examined.

View full abstract

This paper presents an activity teaching system for multi-fingered hand-arm robot. Activity of hand is taught by dataglove that been fixed on the manipulator, motion of manipulator is decided by the same hand, direct teaching is utilized therefore teaching parameters are determined by operator's intuition. Motion of manipulator and hand can be taught simultaneously. The system is simple and easily being used. In process of playback, a special force playback formula is proposed as the some inaccuracy of dataglove exists. This system is This system is being expected to be applied for grasping tasks.

View full abstract

Kudou make end-effector which generate large force and push obejects in two-dimentional surface. We use this end-effector to position heavy obejects. But the end-effector is moved by reference force from obejects when push the obejects, and we can't calculate how force we need to push the object and estimate the movement of the object. So in this paper, we analysis the movement of the object in two-dimentional surface and applying force to the end-effector.

View full abstract

The measurement of ground reaction force is important in gait analysis. We have developed a wearable sensor device to measure the ground reaction forces by using flexible tactile sensor. In this paper, first, we optimize the dimensions of the sensor device by using the finite element method, in older to make the sensor device lighter. Second, we develop the lighter sensor device. Finally, we experimentally examine the usefulness of the developed sensor device.

View full abstract

In order to use robots effectively in the human life environment, an adaptive motion trajectory generation method based on sensor information is required. Central pattern generator to generate adaptive motion trajectory have been investigated by many researchers. However, to perform a number of different works and to return to works safely when large disturbances occurred have not been studied. So we propose an adaptive motion trajectory generation method by using structure changeable central pattern generator network. In this paper we report the experimental results of give disturbance to manipulator while it is stretching and bending arm, and swinging arm up and down.

View full abstract

Robots are usually controlled by the hand position trajectory or joint angle trajectory. However, in task of throwing or hitting, the most important parameter of the task is velocity at the time of release or hitting. We propose the motion trajectory generation method based on task description by velocity target. To verify our method, we conducted simulations on task of hitting and throwing. As a result, we confirm the two advantages of the motion control of robot with velocity trajectory; the first is able to adjust easily the velocity of robot at the time of release or hitting; the second is able to achieve the same task in different positions by changing the task position of the robot hand.

View full abstract

In this paper, we develop an ambulation training robot equipped with mechanical safety devices to improve the safety for patients. The safety device consists of only mechanical components without actuators, controllers and batteries. The safety device locks the robot's wheel after detecting the overdrive on the basis of the wheel's angular velocity. First, the design concept of the ambulation training robot is discussed. Second, the mechanism of the safety device is explained. Third, the ambulation training robot equipped with mechanical safety devices is developed. Finally, the usefulness of the safety devices in the ambulation training robot is experimentally examined.

View full abstract

In this paper, we develop an intelligent walking support machine controlled by powder brakes. The machine has a treadmill and a patient support part. The treadmill has an endless belt controlled by a powder brake. The patient support part has a constant force spring and a powder brake. The constant force spring is used in order to provide with partial body weight support. When a patient normally uses this support machine, the machine provides the patient with partial body weight support. After the machine detected the patient's fall, the machine prevents the fall by applying the impedance control to the powder brakes. The usefulness of this machine is experimentally examined.

View full abstract

Electro-conjugate fluid (ECF) is a kind of functional fluid, which produces a jet flow (ECF jet) when subjected to high DC voltage. It is possible to develop a novel robot finger/hand integrated with a pump and a tank by using ECF as a power source. The purpose of this study is improvement of the ECF robot finger we have been proposed. First, we propose a new type ECF jet generator which is a micro power source of the robot finger. Next, we characterize a flexible finger which newly has a strain gauge to detect a displacement of the finger. Finally, we develop a new robot finger which mainly composed of the ECF jet generator and the flexible finger, and demonstrate that the performance of the robot finger was improved.

View full abstract

This research is development of the passive auxiliary equipment for the holding operation. This device assists the power that the finger holds. The lock mechanism using the one way clutch and the air pressure actuator is used to assist. This device is not used the motor and works passively. This purpose is for the person to whom the grip is weak to give the thing for oneself. The person to whom the grip is weak can also easily wear it with a restraining device. We made the prototype of this device. It takes an active part in the future on the nursing site.

View full abstract

When useing posision-controlled manipulator to task that is insisted on touching surroundings, Positional err of manipulator generates excessive inner force, and this inner force cause manipulatator break. In order to avoid breaking manipulator, we have used Free-joint system in manipulator's wrist to absorb the positional err. In this case, DOF of manipulator's wrist is adjusted adequately in consideration of contacting condition. To change the DOF of manipulator's wrist We developed a DOF adjustable mechanism by using electro-magnetic clutch, but using electro-magnetic clutch made device heavy and learge. So in this paper we propose that develop the small DOF adjustable wrist mechanism using linear clutch stractur by using MR fluid

View full abstract

Recently, many researchers are investigating about humanoid robot. The humanoid robot is expected to perform actual tasks in the human living environment in the future. However, The humanoid robot has not enough hand operational force for real tasks. Therefore, it may happen to fail a task or break robot parts if the excessive force at the end effector is applied. We propose applying the pose in which the load is not applied on the specific joint to a robot's task, featuring selective utilization of their actuators. In this report, we propose method to derive the robot configuration which specific joint's torque becomes the zero and demonstrate weight lifting task by 3-link manipulator as one of the task in which the method is effective.

View full abstract

Multiple magnetic suspension suspends multiple floators with a single power amplifier. It is classified into parallel magnetic suspension and series magnetic suspension. Parallel magnetic suspension systems are classified according to the output type of amplifier and the connection method of coils. This paper focuses on the current-controlled series-connected multiple suspension system. The feasibility of the zero-power control in the parallel magnetic suspension system with different polarities is demonstrated experimentally. The zero-power control is achieved by using PD control and introducing a minor feedback of the integral of the current. It was confirmed experimentally that the coil current converged to zero for constant disturbances in the designed control system.

View full abstract

Variable flux-path magnetic suspension system has been proposed as one of the magnetic suspension systems, which controls the attractive force by moving a pair of control plates located between the permanent magnet and the floator. In this paper, a new variable flux-path magnetic suspension system using flux concentration is proposed. This system has permanent magnet plates as control plates while conventional system has ferromagnetic plates, so that the increase of attractive force can be expected. To verify the prediction, distribution of flux density and attractive force were analyzed by using FEM. These analyses clarified the increase of attractive force and relations between the attractive force and the distance of the control plates. To test the analytical results, an experimental apparatus was fabricated. The measurement results support the analytical predictions.

View full abstract

This paper describes the working autonomous underwater vehicle "MR-X1" which has been developed by JAMSTEC. It is used for a test bed of advanced elemental technologies for underwater such as a navigation system, a control system and a power supply system. And also, it can perform a variety of mission as a working AUV. For example, it can track marine organism and take images using camera systems. And also it can observe the seafloor using acoustic devices and can perform light works such as the sensor setting/retrieving on the seafloor. It changes the equipment depending on the mission type. Recently, it was equipped with a columnar mud sampler and then it gets the sedimentary layers of seafloor. And other times, it cruised on a sea hill with a cesium magnetometer to measure the changing of the geomagnetism. And it was equipped with a magnetometer and set it on the previously-determined area autonomously to precisely measure the geomagnetism. In this paper, the outline of MR-X1 and some newly-developed technologies are described with some results of a sea trial.

View full abstract

This paper discusses stability analysis of a flying vehicle with passive stabilizing mechanism. In our previous paper, we proposed passive stabilizing mechanism which can achieve passive stabilization of roll and pitch angles, and verified the effectiveness of the mechanism through the hovering experiments of a small-size RC helicopter with coaxial counter-rotating blades. In order to theoretically prove stability of the flying vehicle with the mechanism, in this paper, we derive dynamics of a quad-rotor flying vehicle with a gasbag, and consider stability of the flying vehicle with the mechanism through Lyapunov's stability theory.

View full abstract

This paper presents a development of a quadrotor-type flying robot with four propellers for level flight. A key feature of the developed flying robot is to have four propulsive rotors besides four rotors for altitude and attitude control. By using the propulsive rotors, the developed flying robot is capable of performing level flight under the condition that attitude of the body is stable. Moreover, in this paper, we discuss attitude control of the flying robot and design the controller for the robot.

View full abstract

To prevent a possible accident at a plant, it is crucial to find defects or deterioration early in regular inspections at pipeline. To this end, this paper proposes a pipe inspection robot, which can be used in a plant at regular inspections. The proposed robot is smaller than a sphere of 13cm in diameter so that it can fit in any type of pipes including straight and curved pipes as well as T-shaped pipe of 13cm in diameter. The subject of the research is the development of the systems to recognize and control the robot attitude. Four laser pointers are added to the robot for attitude recognition. The algorithm for attitude recognition is realized by utilizing images of reflected lights from four laser pointers. The images of reflected lights are captured by an wide-angle camera attached to the robot for inspection. Several algorithms for attitude recognition are developed and tested on straight and curved pipes to find an algorithm that achieves smooth robot motion.

View full abstract

Unicycle is dynamically unstable system. However, Human can stabilize posture of unicycle. It is difficult to clarify control algorithm. Therefore, the purpose of this study is to develop a unicycle robot for emulating a human riding behavior and to stabilize posture of the unicycle robot. From the unicycle riding experiment of a human, pitching moment, rolling moment, yawing moment that generated by pedal control known to be exerted influence by posture angle of unicycle. However, control algorithm remains to be elucidated. We manufactured unicycle robot recreating pedal motion of a human. This paper reports on result of pitch angle control as initial stage of our work.

View full abstract

Human safety is one of the most important issues in human-friendly robotics. We have proposed the safety device to improve the safety for humans in the robot's workspace. The safety device consists of only mechanical components without actuators, controllers and batteries. The safety device locks the robot's joint after detecting the overdrive on the basis of the joint's angular velocity. In this paper, first, a human-friendly robot with mechanical safety devices is explained. Second, the mechanism of the safety device is explained. Third, the human-friendly robot with mechanical safety devices is designed and developed. Finally, the usefulness of the safety devices in the human-friendly robot is experimentally examined.

View full abstract

A many crawler vehicles for rescue use have been researched so far. In the near future, if this type of research is to advance to the next stage, experiments in realistic environments are necessary. Particularly, dust proof and water proof capabilities are necessary to operate in a real environment. The existing sealing technology for the driving parts is difficult to be used for robots whose outputs are small because the friction loss is not small. This paper describes proposal of the high strength retractable skin and development of the closed type crawler vehicle covered by it.

View full abstract

Position estimation by odometry has accumulated errors. Therefore, robots correct errors using landmarks. In this research, the landmarks are generated from map on "Google Maps". We propose the system of the position correction using the map acquired from "Google Maps". In this research, we assumed that landmarks are possible to be generated from the map. Based on this assumption, we developed the system of self-position correction by adopting "Monte Carlo localization".

View full abstract

In future planetary exploration missions, planetary robots are required to traverse over very rough terrain. On the lunar surface and Mars surface, there are covered with loose soil. The mechanism, which occurs stacks, is not yet clear. Mobility performance of rover change by the wheel forms. However, the research is very few that focus on wheel forms. Therefore, this paper investigates the kinematics behavior of planetary rovers with loose soil traction mechanism from the standpoint that wheel forms about wheel size, wheel with or without lug. Wheel with lug increase mobility performance than without. Moreover, from running experiments when radius of the wheel becoming large, the mobility performance of wheel increases.

View full abstract

We simulated the jammed finger using 3-dimensinal FEM and elucidated the mechanism of finger injury. We obtained CT and MRI images from the index finger in a fully extended position. The shape of the finger was extracted using a software and used to build a 3D mesh model. The 3D finger model was analyzed using a software. The 3D finger model was constituted of a distal phalanx bone, a middle phalanx bone, subcutaneous tissue, skin, a nail, tendons and ligaments. The condition of FEM was that a rigid ball collided against the finger model from three directions. As a result, The equivalent Stress was larger by the collision from the palm side better than that from dorsum side. As for this thing, the possibility that an mallet fracture produced by a collision from the palm side was suggested.

View full abstract

In studying considered two different boundary conditions for human head impact response by using a finite element analysis(FEM). In tied condition all nodes are connected tightly and in slide condition relative displacement between two contact-faces are allowed in the direction of contact face. The three-dimensional finite element human head model constructed hexahedron solid elements based on MRI data to explain the mechanism of closed head impact injury. This investigation was to examine the boundary conditions of human head organization with validity of modeling. By this report, a procedure of constructing the model only with MRI data is reported and the results of both boundary conditions were compared with the impact experiment by acrylic cylindrical container and Nahum's cadaver experiment.

View full abstract

With the progress of CT machines, image-based finite element simulation is becoming a useful tool for oral biomechanics research. The authors have so far presented the microscopic stress evaluation for peri-implant trabecular bone based on the precise micro-CT images. This paper discusses the possibility of applying cone beam CT (CBCT) images, which is used for dental diagnosis for real patients, to biomechanics simulation. Although severe artifact was seen in CBCT images, it was removed carefully. The comparison of some representative dimensions between micro-CT and CBCT told us that there was approximately 5% relative error and more at some locations. However, the stress distribution evaluated by histogram that was predicted by CBCT images agreed well with that obtained by micro-CT, especially near the oral implant. This result implies future possibility to analyze the stress for real patient, which can lead to the investigation of the correlation between stress and clinical problems quantitatively.

View full abstract

This study presents a numerical methodology to clarify the morphology of complex trabecular network architecture in human lumber vertebra by means of the new post-processing technique for calculated microscopic stress by the homogenization method. The trabeculae are classified into eight groups from the viewpoint of load bearing function against three loading conditions in the proposed post-processing of numerical results. It contributes to the understanding of the mechanical role of trabecular bone in vertebra. The primary trabecular bone that has been supposed to support the self-weight and secondary bone that connects the primary bone are successfully visualized. Discussion on the mechanical role of plate-like trabecular bone in the load path network system is also highlighted.

View full abstract

This paper aims at finding the initial trigger of pressure ulcers. The fibril tissue damage was one assumption that might cause pressure ulcers. It was then modeled as interface crack between bone and muscle. A manual mesh was created for this research in order to get a more accurate result at the interface between the muscle and the bone. To discuss the possibility of fibril tissue breakage, the interface strain/stress was calculated in the local coordinate system of a normal and tangential direction along the curved interface. The interface of the muscle and bone are then analyzed to see the effect given by fiber breakage. The results of the analysis show that fibril tissue at the interface between bone and muscle gave significant effect locally but not globally.

View full abstract

The purpose of this study is to investigate an influence of cholesterol on the near-infrared images of blood vessels. In this study, the near-Infrared images of lateral caudal veins in a male Wistar rat were captured while pressing rat's tail by a tail cuff. The ten high cholesterol rats and the ten normal rats were used for this study. The total cholesterol density of the high-cholesterol rat was about 3.5 times as large as that of the normal rat significantly (p<0.01). As the pressure level increased, the change in the luminance of the near-infrared images increased in both rats. This result shows congestion in the lateral caudal veins compressed by the tail cuff. In 80mmHg and 100mmHg pressure level, the change in the luminance of the near-infrared images in the high-cholesterol rats was larger than that in the normal rats significantly (p<0.05).

View full abstract

Biomedical signals, such as electromyography(EMG)signals, are utilized for the human-machine interface. The purpose of this study is to control the myoelectric prosthetic hand that can grasp various objects stably. The EMG signals of the muscles of shoulder periphery were recorded with 1000Hz sampling by 10 healthy men who performed movements of the each instrumentation movement in a 70% contraction. The integrated EMG (iEMG) and mean power frequency (MPF) were calculated from the start of the recorded results. The iEMG and MPF gradually decreased from the start of the movement. So, the difference values of iEMg and MPF between the start and the end of the movements were calculated. In the movement, The significant difference did not occur in iEMQ, and the difference value of MPF in the Lnfra-spinatus was smaller than that in the Deltoid, acomial part.

View full abstract