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Asada, MA
Harry Asada, Lincoln, MA US
| Patent application number | Description | Published |
|---|---|---|
| 20080295314 | METHODS AND APPARATUS FOR AN INSTRUMENTED FASTENER - An instrumented fastener (e.g., a “tack” fastener) includes one or more light sources (e.g., light-emitting diodes) configured to produce a light beacon that includes encoded information regarding the instrumented fastener (e.g., part number), wherein the direction of the light beacon can be used to align external and/or internal assembly systems to the instrumented fasteners. The light beacon may be activated automatically, or via an instruction received from an external system. Once aligned, the assembly system may, for example, proceed with installing permanent fasteners between neighboring tack fasteners. | 12-04-2008 |
| 20100071192 | ELECTROMAGNETIC CLAMPING DEVICE - An apparatus may comprise a permanent magnet unit, an end effector, and an electromagnetic clamping device. The end effector may be capable of performing workpiece operations. The electromagnetic clamping device may have an activated state and a deactivated state. | 03-25-2010 |
Haruhiko H. Asada, Lincoln, MA US
| Patent application number | Description | Published |
|---|---|---|
| 20100016736 | Estimating Aortic Blood Pressure from Non-Invasive Extremity Blood Pressure - Methods and a computer program product for using a circulatory measurement on an extremity of a particular subject to derive an aortic blood pressure for that subject. A model is constructed that maps a peripheral cardiovascular waveform to a central cardiovascular waveform on the basis of a plurality of model parameters. A time record is obtained using a non-invasive blood pressure sensor disposed at a solitary position periphery of the cardiovascular system of a subject. The time record is then transformed to obtain a plurality of test central blood pressure waves, with a single test central blood pressure wave is based on each of a plurality of sets of values of the model parameters. An optimum set of values of the model parameters is then selected, based on a specified criterion applied to the plurality of test central blood pressure waves, so that the aortic circulatory waveform of the subject can be obtained. | 01-21-2010 |
| 20100241011 | Calibration of Pulse Transit Time Measurements to Arterial Blood Pressure using External Arterial Pressure Applied along the Pulse Transit Path - An apparatus and methods for adaptive and autonomous calibration of pulse transit time measurements to obtain arterial blood pressure using arterial pressure variation. The apparatus and methods give pulse transit time (PTT) devices an ability to self-calibrate. The methods apply a distributed model with lumped parameters, and may be implemented, for example, using pulse transit time measurements derived from a wearable photoplethysmograph (PPG) sensor architecture with an intervening pressurizing mechanism. | 09-23-2010 |
Haruhiko Harry Asada, Lincoln, MA US
| Patent application number | Description | Published |
|---|---|---|
| 20080200997 | Broadcast control of cellular stochastic control systems with applications to actuators - A broadcast feedback method is presented for distributed stochastic control of an actuator system consisting of many cellular units. The method can be implemented for an artificial cellular actuator, consisting of many units of smart actuator material with a random signal generator. The output of the actuator system is an aggregate effect of numerous cellular units, each taking a bi-stable ON-OFF state. A central controller broadcasts the error between the aggregate output and a reference input. The central controller broadcasts the overall error signal to all the cellular units uniformly. In turn, each cellular unit makes a stochastic decision with a state transition probability modulated in relation to the broadcasted error. Even in the absence of deterministic coordination, the ensemble of the cellular units can track a given trajectory stably. | 08-21-2008 |
| 20090115292 | STRAIN AMPLIFICATION DEVICES AND METHODS - A multi-layer strain-amplification device includes at least one first amplifying layer unit and a second amplifying layer unit positioned about the at least one first amplifying layer unit. A strain of the at least one first amplifying layer unit is amplified by the second amplifying layer unit. | 05-07-2009 |
| 20110109198 | PHASED ARRAY BUCKLING ACTUATOR - A harmonic buckling actuator is comprised of numerous buckling units engaged to a rotational track/gear. Each buckling unit includes two input translational actuators. One end of each input actuator is constrained to rotate about a rotational joint that is rigidly attached to a common ground. The other end of each input actuator is constrained to move with the other actuator of the same buckling unit along a single output axis via another rotational joint that is the output of the buckling unit. The inactivated, unforced configuration of each buckling unit is such that the input actuators are nearly collinear with the line segment connecting the unit's grounded rotational joints. This line segment is parallel to the output axis of the track/gear. The buckling units are arrayed around the track/gear such that their outputs are spatially phased within the groves of the track/gear. Harmonic activation of the buckling units generates torque on the track/gear about its output axis. The hollow section of the track/gear encompasses a gear reducer such as a planetary gear box, cyclo-drive, or harmonic drive. The track/gear is coupled to the slow speed shaft of the reducer. The buckling unit supports are rigidly coupled to each other and to the gear box of the reducer. The high speed shaft is the output shaft of the entire harmonic buckling actuator. | 05-12-2011 |
H. Harry Asada, Lincoln, MA US
| Patent application number | Description | Published |
|---|---|---|
| 20100037637 | OIL CIRCULATION OBSERVER FOR HVAC SYSTEMS - An innovative oil observer for estimating oil concentration and oil amount in a refrigerant compressor in a vapor compression cycle is described. The invention ensures the safe operation of the compressor by ensuring that adequate lubricant is present in the compressor. This oil observer is based on oil models for components of air conditioning and refrigeration systems. Oil models for HVAC components estimate oil mass and refrigerant mass in each component. With all component oil models and heat exchanger observers which provide the estimation of inner geometric lengths of two-phase flow heat exchangers, a system-level oil observer is established by integrating all component models. Experimental testing has been conducted to verify the performance of this oil observer for steady state operation and dynamic processes. The invention has direct applications in residential and commercial air conditioning and refrigeration systems. | 02-18-2010 |