Patents by Inventor Chi-Sang Poon
Chi-Sang Poon has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).
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Publication number: 20180235934Abstract: Aspects of the disclosure relate to methods for treating disorders using agents for promoting hypoglossal motoneuron excitability. In some instances the disorders include obstructive sleep apnea (OSA), cataplexy, attention deficit/hyperactivity disorder (ADHD), attention deficit disorder (ADD) or depression. Related products are also included within the invention.Type: ApplicationFiled: August 18, 2016Publication date: August 23, 2018Applicant: Massachusetts Institute of TechnologyInventors: Chi-Sang Poon, Gang Song
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Patent number: 9737258Abstract: A method and associated apparatus combine a calculation of chaos of a quantifiable cardiac characteristic associated with a patient with a measurement of a non-increasing parasympathetic activity of the patient to detect a physiological abnormality of the patient.Type: GrantFiled: January 31, 2013Date of Patent: August 22, 2017Assignee: Massachusetts Institute of TechnologyInventors: Chi-Sang Poon, Zhi-De Deng
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Patent number: 9078984Abstract: An entrainment-based mechanical ventilator may be initially set to approximate the patient's spontaneous respiratory frequency, enabling the patient to entrain to the ventilator if the ventilator frequency matches the patient's spontaneous breathing frequency or is within a reasonable range from it. If the preset frequency of the ventilator is set too high or too low from the spontaneous frequency, the patient will fall out of phase and “fight” the ventilator. The ventilator phase relative to the patient's breathing effort indicates the difference between the ventilator frequency and spontaneous frequency. Based on the phase difference, a closed-loop control mechanism may continuously adjust the ventilator frequency to match the patient breathing frequency until the phase shift is within a preset limit. Patient-ventilator entrainment will occur when the ventilator frequency is within a certain range from the patient breathing frequency.Type: GrantFiled: January 30, 2009Date of Patent: July 14, 2015Assignee: Massachusetts Institute of TechnologyInventors: Chi-Sang Poon, Gang Song, Shawna M. MacDonald
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Patent number: 8653867Abstract: A pulse modulated neural integrator circuit is comprised of discrete analog electronic components and has a plurality of discrete stable states. In some embodiments, the pulse modulated neural integrator circuit is fabricated in whole or in part on an integrated circuit substrate using analog VLSI techniques. A phase locked loop circuit can use the pulse modulated neural integrator circuit in place of some conventional phase locked loop circuits.Type: GrantFiled: July 15, 2010Date of Patent: February 18, 2014Assignees: Massachusetts Institute of Technology, University of New HampshireInventors: Chi-Sang Poon, Joshua Jen Monzon, Kuan Zhou
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Patent number: 8600919Abstract: A neuromorphic circuit performs functions representative of spiking timing dependent plasticity of a synapse.Type: GrantFiled: August 25, 2009Date of Patent: December 3, 2013Assignee: Massachusetts Institute of TechnologyInventors: Chi-Sang Poon, Joshua Jen Choa Monzon, Kuan Zhou
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Patent number: 8504503Abstract: A pulse modulated neural integrator circuit is comprised of discrete analog electronic components and has a plurality of discrete stable states. In some embodiments, the pulse modulated neural integrator circuit is fabricated in whole or in part on an integrated circuit substrate using analog VLSI techniques. A phase locked loop circuit can use the pulse modulated neural integrator circuit in place of some conventional phase locked loop circuits.Type: GrantFiled: July 15, 2010Date of Patent: August 6, 2013Assignee: Massachusetts Institute of TechnologyInventors: Chi-Sang Poon, Joshua Jen Monzon, Guy Rachmuth, Kuan Zhou
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Publication number: 20110137843Abstract: A neuromorphic circuit performs functions representative of spiking timing dependent plasticity of a synapse.Type: ApplicationFiled: August 25, 2009Publication date: June 9, 2011Applicants: MASSACHUSETTS INSTITUTE OF TECHNOLOGY, UNIVERSITY OF NEW HAMPSHIREInventors: Chi-Sang Poon, Joshua Jen Choa Monzon, Kuan Zhou
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Patent number: 7714762Abstract: A current-mode analog-to-digital (IADC) has subnA sensitivity. An IADC cell receives an input current signal and provides an output to a comparator for comparison with an adjustable input reference signal. A digital output signal is generated and an analog output is provided to the next cell.Type: GrantFiled: April 12, 2005Date of Patent: May 11, 2010Assignee: Massachusetts Institute of TechnologyInventors: Chi-Sang Poon, Guy Rachmuth
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Publication number: 20090194110Abstract: An entrainment-based mechanical ventilator may be initially set to approximate the patient's spontaneous respiratory frequency, enabling the patient to entrain to the ventilator if the ventilator frequency matches the patient's spontaneous breathing frequency or is within a reasonable range from it. If the preset frequency of the ventilator is set too high or too low from the spontaneous frequency, the patient will fall out of phase and “fight” the ventilator. The ventilator phase relative to the patient's breathing effort indicates the difference between the ventilator frequency and spontaneous frequency. Based on the phase difference, a closed-loop control mechanism may continuously adjust the ventilator frequency to match the patient breathing frequency until the phase shift is within a preset limit. Patient-ventilator entrainment will occur when the ventilator frequency is within a certain range from the patient breathing frequency.Type: ApplicationFiled: January 30, 2009Publication date: August 6, 2009Inventors: Chi-Sang Poon, Gang Song, Shawna M. MacDonald
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Publication number: 20060228046Abstract: A current-mode analog-to-digital (IADC) has subnA sensitivity. An IADC cell receives an input current signal and provides an output to a comparator for comparison with an adjustable input reference signal. A digital output signal is generated and an analog output is provided to the next cell.Type: ApplicationFiled: April 12, 2005Publication date: October 12, 2006Inventors: Chi-Sang Poon, Guy Rachmuth
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Patent number: 7047225Abstract: A Hebbian synapse emulation circuit models the conductance of a synapse circuit. In one embodiment, the circuit includes a counter that provides control signals determining the conduction states of electrical pathways, which define the conductance level of the synapse. The counter can increment, decrement, or leave the same, the synapse conductance value based upon potentiation and depression signals that are derived from a voltage that corresponds to the calcium concentration in the synapse. The counter can be coupled to a plurality of synapse circuits on a time-shared basis.Type: GrantFiled: February 16, 2005Date of Patent: May 16, 2006Assignee: Massachusetts Institute of TechnologyInventor: Chi-Sang Poon
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Publication number: 20050137993Abstract: A Hebbian synapse emulation circuit models the conductance of a synapse circuit. In one embodiment, the circuit includes a counter that provides control signals determining the conduction states of electrical pathways, which define the conductance level of the synapse. The counter can increment, decrement, or leave the same, the synapse conductance value based upon potentiation and depression signals that are derived from a voltage that corresponds to the calcium concentration in the synapse. The counter can be coupled to a plurality of synapse circuits on a time-shared basis.Type: ApplicationFiled: February 16, 2005Publication date: June 23, 2005Inventor: Chi-Sang Poon
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Publication number: 20040139040Abstract: A Hebbian synapse emulation circuit models the conductance of a synapse circuit. In one embodiment, the circuit includes a counter that provides control signals determining the conduction states of electrical pathways, which define the conductance level of the synapse. The counter can increment, decrement, or leave the same, the synapse conductance value based upon potentiation and depression signals that are derived from a voltage that corresponds to the calcium concentration in the synapse. The counter can be coupled to a plurality of synapse circuits on a time-shared basis.Type: ApplicationFiled: January 5, 2004Publication date: July 15, 2004Inventors: Louis Nervegna, Chi-Sang Poon
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Patent number: 6687686Abstract: A Hebbian synapse emulation circuit models the conductance of a synapse circuit. In one embodiment, the circuit includes a counter that provides control signals determining the conduction states of electrical pathways, which define the conductance level of the synapse. The counter can increment, decrement, or leave the same, the synapse conductance value based upon potentiation and depression signals that are derived from a voltage that corresponds to the calcium concentration in the synapse. The counter can be coupled to a plurality of synapse circuits on a time-shared basis.Type: GrantFiled: July 6, 2000Date of Patent: February 3, 2004Assignee: Massachusetts Institute of TechnologyInventors: Louis Nervegna, Chi-Sang Poon
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Patent number: 6507828Abstract: A neuron circuit including means for synaptic modification is described. The circuit emulates the electrical behaviors of the neuron membrane, dendrite, and synapse, using principles based on the actual biology. In one embodiment, the circuit is implemented as an analog very large scale integrated (VLSI) circuit which utilizes CMOS integrated circuit technology. The analog VLSI circuit includes a synapse circuit having a circuit portion which models a mechanism for the modification of the synaptic conductance.Type: GrantFiled: June 14, 1999Date of Patent: January 14, 2003Inventors: Jason Leonard, Chi-Sang Poon
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Patent number: 6095140Abstract: A device for triggering the inspiratory phase of a ventilator having a three-way connector with an inspiratory conduit and an expiratory conduit, each communicating with the ventilator and with a patient communicating conduit. A valve arrangement associated with both the expiratory and inspiratory conduits are automatically operated by a patient attempting to breathe, such that the patient is only exposed to the air volume in the three-way connector and not to the greater air volume of the ventilator and its connected tubing.Type: GrantFiled: April 9, 1998Date of Patent: August 1, 2000Assignee: Massachusetts Institute of TechnologyInventors: Chi-Sang Poon, Kumaran Kolandaivelu
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Patent number: 5938594Abstract: Methods and apparatus are provided for detecting the presence of a nonlinear characteristic of an autonomous (i.e., non-driven and time-invariant), dynamical system and for determining whether such nonlinear dynamical system is chaotic. First, a system is determined to be either nonlinear or linear. If the system is determined to be nonlinear, then noise of increasing intensity is incrementally added to a data set representing the analyzed system until the resulting test signal appears to be linear. If the noise limit of the resulting test signal is significantly greater than zero, then the system is determined to be chaotic and the amount of noise added to the data set provides an indication of the relative strength of the chaos. Alternatively, if the noise limit of the resulting test signal is approximately zero, then the system is determined to be nonlinear with periodic or quasi-periodic limit cycles.Type: GrantFiled: May 13, 1998Date of Patent: August 17, 1999Assignee: Massachusetts Institute of TechnologyInventors: Chi-Sang Poon, Mauricio Barahona
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Patent number: 5871008Abstract: A high-frequency miniature pressure ventilator system including a variable volume pressure chamber arranged to surround a portion of the thoracic cavity of a body so as to isolate the portion of the body from atmospheric pressure. A pump assembly is operable for varying the pressure within the chamber so as to apply negative external pressure to the portion of the body during a negative cycle of operation. A valve assembly is operable for opening the chamber to a predetermined pressure during a positive cycle of operation in order to normalize a base pressure from which the pressure within said chamber is varied. In another embodiment there is provided a high-frequency pressure ventilator system including a variable volume pressure chamber arranged to surround the head of a body so as to isolate the head from atmospheric pressure. A pump assembly is operable for varying the pressure within the chamber so as to apply positive external pressure to the head during a positive cycle of operation.Type: GrantFiled: October 3, 1996Date of Patent: February 16, 1999Assignee: Massachusetts Institute of TechnologyInventors: Chi-Sang Poon, Kumaran Kolandaivelu
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Patent number: 5792062Abstract: A method and apparatus for detecting the presence of a nonlinear characteristic in a data sequence is provided.Type: GrantFiled: May 14, 1996Date of Patent: August 11, 1998Assignee: Massachusetts Institute of TechnologyInventors: Chi-Sang Poon, Mauricio Barahona, Christopher K. Merrill
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Patent number: 5592589Abstract: Constraints placed on the structure of a conventional multi-layer network consequently enable learning rules to be simplified and the probability of reaching only local minima to be reduced. These constraints include neurons which are either inhibitory or excitatory. Also, for each neuron in the hidden layer, there is at most one synapse connecting it to a corresponding neuron in the output layer. The result is a tree-like structure which facilitates implementation of large scale electronic networks, and allows for parallel training of parts of the network. Additionally, each neuron in the hidden layer receives a reinforcement signal from its corresponding neuron in the output layer which is independent of the magnitude of synapses posterior to the hidden layer neuron. There may be multiple hidden layers, wherein each layer has a plurality of neurons, and wherein each neuron in an anterior layer connects to only one neuron in any posterior layer.Type: GrantFiled: July 8, 1993Date of Patent: January 7, 1997Assignee: Massachusetts Institute of TechnologyInventor: Chi-Sang Poon