maysam maysam | Imam Khomeini International University(IKIU) (original) (raw)

Papers by maysam maysam

Abstract The development of advanced neuroprosthetic systems and brain-machine interfaces for hig... more Abstract The development of advanced neuroprosthetic systems and brain-machine interfaces for high-capacity, real-time, bi-directional communication with the nervous system is a major challenge to the emerging neural engineering discipline.

Abstract The next generation of implantable high-power neuroprosthetic devices such as visual pro... more Abstract The next generation of implantable high-power neuroprosthetic devices such as visual prostheses and brain computer interfaces are going to be powered by transcutaneous inductive power links formed between a pair of printed spiral coils (PSC) that are batch-fabricated using micromachining technology. Optimizing the power efficiency of the wireless link is imperative to minimize the size of the external energy source, heating dissipation in the tissue, and interference with other devices.

Abstract This paper presents a standalone closed loop wireless power transmission system that is ... more Abstract This paper presents a standalone closed loop wireless power transmission system that is built around a commercial off-the-shelf (COTS) radio frequency identification (RFID) transceiver (MLX90121) operating at 13.56 MHz. It can be used for inductively powering implantable biomedical devices in a closed loop fashion.

Abstract Describes the implementation of several fully integrated on-chip rectifier designs in Bi... more Abstract Describes the implementation of several fully integrated on-chip rectifier designs in BiCMOS technology for rectifying the externally generated RF magnetic power and data carrier signal in wireless biomedical implants to generate an unregulated DC supply. It also presents application of these rectifiers in an integrated dual±5 V output supply capable of providing up to 50 mW for wireless biomedical implants.

Abstract Pulse Harmonic Modulation (PHM) is a novel pulse-based (carrierless) modulation method f... more Abstract Pulse Harmonic Modulation (PHM) is a novel pulse-based (carrierless) modulation method for wideband, low power data transmission across inductive telemetry links that operate in the near-field domain. PHM utilizes two or more unidentical pulses during each bit period to minimize intersymbol interference (ISI). In this paper, we describe the PHM concept and demonstrate its operation with a proof-of-concept prototype, which achieves a data rate of 5.2 Mbps at 1 cm coil separation with a bit error rate (BER) of 10− 6.

Background To provide an alternative motor modality for control, navigation, and communication in... more Background To provide an alternative motor modality for control, navigation, and communication in individuals suffering from impairment or disability in hand functions, a Tongue Drive System (TDS) has been developed that allows for real time tracking of tongue motion in an unobtrusive, wireless, and wearable device that utilizes the magnetic field generated by a miniature disk shaped magnetic tracer attached to the tip of the tongue.

Abstract Tongue Drive System (TDS) is a wireless, wearable assistive technology that enables indi... more Abstract Tongue Drive System (TDS) is a wireless, wearable assistive technology that enables individuals with severe motor impairments access computers, drive wheelchairs, and control their environments using tongue motion. In this paper, we have evaluated the TDS performance as a computer input device using ISO9241-9 standard tasks for pointing and selecting, based on the well known Fitts' Law, and as a powered wheelchair controller through an obstacle course navigation task.

Abstract Tongue Drive System (TDS) is a wireless tongue-operated assistive technology (AT), devel... more Abstract Tongue Drive System (TDS) is a wireless tongue-operated assistive technology (AT), developed for people with severe physical disabilities to control their environment using their tongue motion. We have developed a new ergonomic headset for the TDS with a user-friendly smartphone interface, through which users will be able to wirelessly control various devices, access computers, and drive wheelchairs.

Abstract Intra-oral wireless devices are becoming more popular for physiological monitoring of th... more Abstract Intra-oral wireless devices are becoming more popular for physiological monitoring of the mouth environment and tongue-operated assistive technologies, such as the internal Tongue Drive System (iTDS). Here we present the experimental measurements and simulations of radiation performance of three commercial wireless transmitters operating at 433 MHz, 915 MHz, and 2.42 GHz, in the industrial-scientific-medical band when they were placed inside human mouth.

Abstract In this paper, the results of a 2-D center-out task in a Fitts's law experiment have bee... more Abstract In this paper, the results of a 2-D center-out task in a Fitts's law experiment have been presented for measuring the performance of the Tongue Drive System (TDS). Although the end-user population for TDS is individuals with tetraplegia, in this study, we recruited 6 able-bodied subjects in 3 sessions, conducted in 3 consecutive days. They performed the same task with their right hand using a standard mouse for achieving a baseline as well as a standard keypad with their right index finger.

Abstract Design and development of a micromachined 16-site wireless addressable active stimulatin... more Abstract Design and development of a micromachined 16-site wireless addressable active stimulating microprobe, called Interestim-3, based on the University of Michigan MEMS 3-D microelectrode-array technology have been discussed. Up to 64 Interestim-3 probes can be used in parallel with only 2 connections to a mutual hybrid coil in order to achieve a 1024-site intracortical microstimulating system with no trans or subcutaneous wires.

Abstract Tongue drive system (TDS) is a wireless, wearable assistive technology that enables indi... more Abstract Tongue drive system (TDS) is a wireless, wearable assistive technology that enables individuals with severe motor impairments to access computers, drive wheelchairs, and control their environments using tongue motion. In this paper, we have evaluated the TDS performance as a computer input device in four tasks, commonly known as horizontal, vertical, center-out, and multidirectional rapid tapping, based on Fitts' law and ISO9241-9 Standard.

Abstract This paper presents in vivo experimental results for a closed loop wireless power transm... more Abstract This paper presents in vivo experimental results for a closed loop wireless power transmission system to implantable devices on an awake behaving animal subject. In this system, wireless power transmission takes place across an inductive link, controlled by a commercial off-the-shelf (COTS) radio frequency identification (RFID) transceiver (TRF7960) operating at 13.56 MHz.

Abstract We have developed a magnetic sensor-based wireless pharmaceutical compliance monitoring ... more Abstract We have developed a magnetic sensor-based wireless pharmaceutical compliance monitoring (PCM) system using an array of magneto-inductive sensors mounted around the patient's neck in the form of a tight necklace. This system detects the passage of a pill or capsule embedded with a small permanent magnet as a tracer through the esophagus upon ingestion.

Abstract A brain-computer interface (BCI) is a communication system that can help users interact ... more Abstract A brain-computer interface (BCI) is a communication system that can help users interact with the outside environment by translating brain signals into machine commands. The use of electroencephalographic (EEG) signals has become the most common approach for a BCI because of their usability and strong reliability. Many EEG-based BCI devices have been developed with traditional wet-or micro-electro-mechanical-system (MEMS)-type EEG sensors.

Abstract Magnetic localization has been used in a variety of applications, including the medical ... more Abstract Magnetic localization has been used in a variety of applications, including the medical field. Small magnetic tracers are often modeled as dipoles and localization has been achieved by solving well-defined dipole equations.

Abstract This paper reports scientifically meaningful in vivo experiments using a 32-channel wire... more Abstract This paper reports scientifically meaningful in vivo experiments using a 32-channel wireless neural recording system (WINeR). The WINeR system is divided into transmitter (Tx) and receiver (Rx) parts. On the Tx side, we had WINeR-6, a system-on-a-chip (SoC) that operated based on time division multiplexing (TDM) of pulse width modulated (PWM) samples. The chip was fabricated in a 0.5-µm CMOS process, occupying 4.9× 3.3 mm 2 and consuming 15 mW from±1.5 V supplies.

Abstract In this paper, we evaluate the overall performance of various magnetic-sensor signal pro... more Abstract In this paper, we evaluate the overall performance of various magnetic-sensor signal processing (mSSP) algorithms for the Tongue Drive System based on a comprehensive dataset collected from trials with a total of eight able-bodied subjects. More specifically, we measure the performance of nine classifiers on the two-stage classification used by the mSSP algorithm, in order to learn how to improve the current algorithm.

Abstract–Tongue Drive System (TDS) is a wireless and wearable assistive technology (AT) that enab... more Abstract–Tongue Drive System (TDS) is a wireless and wearable assistive technology (AT) that enables people with severe disabilities to control their computers, wheelchairs, and electronic gadgets using their tongue motion. We developed the TDS to control smartphone's (iPhone/iPod Touch) built-in and downloadable apps with a customized Bluetooth mouse module by emulating finger taps on the touchscreen.

Abstract We present an active full-wave rectifier with offset-controlled high speed comparators i... more Abstract We present an active full-wave rectifier with offset-controlled high speed comparators in standard CMOS that provides high power conversion efficiency (PCE) in high frequency (HF) range for inductively powered devices. This rectifier provides much lower dropout voltage and far better PCE compared to the passive on-chip or off-chip rectifiers.

Abstract The development of advanced neuroprosthetic systems and brain-machine interfaces for hig... more Abstract The development of advanced neuroprosthetic systems and brain-machine interfaces for high-capacity, real-time, bi-directional communication with the nervous system is a major challenge to the emerging neural engineering discipline.

Abstract The next generation of implantable high-power neuroprosthetic devices such as visual pro... more Abstract The next generation of implantable high-power neuroprosthetic devices such as visual prostheses and brain computer interfaces are going to be powered by transcutaneous inductive power links formed between a pair of printed spiral coils (PSC) that are batch-fabricated using micromachining technology. Optimizing the power efficiency of the wireless link is imperative to minimize the size of the external energy source, heating dissipation in the tissue, and interference with other devices.

Abstract This paper presents a standalone closed loop wireless power transmission system that is ... more Abstract This paper presents a standalone closed loop wireless power transmission system that is built around a commercial off-the-shelf (COTS) radio frequency identification (RFID) transceiver (MLX90121) operating at 13.56 MHz. It can be used for inductively powering implantable biomedical devices in a closed loop fashion.

Abstract Describes the implementation of several fully integrated on-chip rectifier designs in Bi... more Abstract Describes the implementation of several fully integrated on-chip rectifier designs in BiCMOS technology for rectifying the externally generated RF magnetic power and data carrier signal in wireless biomedical implants to generate an unregulated DC supply. It also presents application of these rectifiers in an integrated dual±5 V output supply capable of providing up to 50 mW for wireless biomedical implants.

Abstract Pulse Harmonic Modulation (PHM) is a novel pulse-based (carrierless) modulation method f... more Abstract Pulse Harmonic Modulation (PHM) is a novel pulse-based (carrierless) modulation method for wideband, low power data transmission across inductive telemetry links that operate in the near-field domain. PHM utilizes two or more unidentical pulses during each bit period to minimize intersymbol interference (ISI). In this paper, we describe the PHM concept and demonstrate its operation with a proof-of-concept prototype, which achieves a data rate of 5.2 Mbps at 1 cm coil separation with a bit error rate (BER) of 10− 6.

Background To provide an alternative motor modality for control, navigation, and communication in... more Background To provide an alternative motor modality for control, navigation, and communication in individuals suffering from impairment or disability in hand functions, a Tongue Drive System (TDS) has been developed that allows for real time tracking of tongue motion in an unobtrusive, wireless, and wearable device that utilizes the magnetic field generated by a miniature disk shaped magnetic tracer attached to the tip of the tongue.

Abstract Tongue Drive System (TDS) is a wireless, wearable assistive technology that enables indi... more Abstract Tongue Drive System (TDS) is a wireless, wearable assistive technology that enables individuals with severe motor impairments access computers, drive wheelchairs, and control their environments using tongue motion. In this paper, we have evaluated the TDS performance as a computer input device using ISO9241-9 standard tasks for pointing and selecting, based on the well known Fitts' Law, and as a powered wheelchair controller through an obstacle course navigation task.

Abstract Tongue Drive System (TDS) is a wireless tongue-operated assistive technology (AT), devel... more Abstract Tongue Drive System (TDS) is a wireless tongue-operated assistive technology (AT), developed for people with severe physical disabilities to control their environment using their tongue motion. We have developed a new ergonomic headset for the TDS with a user-friendly smartphone interface, through which users will be able to wirelessly control various devices, access computers, and drive wheelchairs.

Abstract Intra-oral wireless devices are becoming more popular for physiological monitoring of th... more Abstract Intra-oral wireless devices are becoming more popular for physiological monitoring of the mouth environment and tongue-operated assistive technologies, such as the internal Tongue Drive System (iTDS). Here we present the experimental measurements and simulations of radiation performance of three commercial wireless transmitters operating at 433 MHz, 915 MHz, and 2.42 GHz, in the industrial-scientific-medical band when they were placed inside human mouth.

Abstract In this paper, the results of a 2-D center-out task in a Fitts's law experiment have bee... more Abstract In this paper, the results of a 2-D center-out task in a Fitts's law experiment have been presented for measuring the performance of the Tongue Drive System (TDS). Although the end-user population for TDS is individuals with tetraplegia, in this study, we recruited 6 able-bodied subjects in 3 sessions, conducted in 3 consecutive days. They performed the same task with their right hand using a standard mouse for achieving a baseline as well as a standard keypad with their right index finger.

Abstract Design and development of a micromachined 16-site wireless addressable active stimulatin... more Abstract Design and development of a micromachined 16-site wireless addressable active stimulating microprobe, called Interestim-3, based on the University of Michigan MEMS 3-D microelectrode-array technology have been discussed. Up to 64 Interestim-3 probes can be used in parallel with only 2 connections to a mutual hybrid coil in order to achieve a 1024-site intracortical microstimulating system with no trans or subcutaneous wires.

Abstract Tongue drive system (TDS) is a wireless, wearable assistive technology that enables indi... more Abstract Tongue drive system (TDS) is a wireless, wearable assistive technology that enables individuals with severe motor impairments to access computers, drive wheelchairs, and control their environments using tongue motion. In this paper, we have evaluated the TDS performance as a computer input device in four tasks, commonly known as horizontal, vertical, center-out, and multidirectional rapid tapping, based on Fitts' law and ISO9241-9 Standard.

Abstract This paper presents in vivo experimental results for a closed loop wireless power transm... more Abstract This paper presents in vivo experimental results for a closed loop wireless power transmission system to implantable devices on an awake behaving animal subject. In this system, wireless power transmission takes place across an inductive link, controlled by a commercial off-the-shelf (COTS) radio frequency identification (RFID) transceiver (TRF7960) operating at 13.56 MHz.

Abstract We have developed a magnetic sensor-based wireless pharmaceutical compliance monitoring ... more Abstract We have developed a magnetic sensor-based wireless pharmaceutical compliance monitoring (PCM) system using an array of magneto-inductive sensors mounted around the patient's neck in the form of a tight necklace. This system detects the passage of a pill or capsule embedded with a small permanent magnet as a tracer through the esophagus upon ingestion.

Abstract A brain-computer interface (BCI) is a communication system that can help users interact ... more Abstract A brain-computer interface (BCI) is a communication system that can help users interact with the outside environment by translating brain signals into machine commands. The use of electroencephalographic (EEG) signals has become the most common approach for a BCI because of their usability and strong reliability. Many EEG-based BCI devices have been developed with traditional wet-or micro-electro-mechanical-system (MEMS)-type EEG sensors.

Abstract Magnetic localization has been used in a variety of applications, including the medical ... more Abstract Magnetic localization has been used in a variety of applications, including the medical field. Small magnetic tracers are often modeled as dipoles and localization has been achieved by solving well-defined dipole equations.

Abstract This paper reports scientifically meaningful in vivo experiments using a 32-channel wire... more Abstract This paper reports scientifically meaningful in vivo experiments using a 32-channel wireless neural recording system (WINeR). The WINeR system is divided into transmitter (Tx) and receiver (Rx) parts. On the Tx side, we had WINeR-6, a system-on-a-chip (SoC) that operated based on time division multiplexing (TDM) of pulse width modulated (PWM) samples. The chip was fabricated in a 0.5-µm CMOS process, occupying 4.9× 3.3 mm 2 and consuming 15 mW from±1.5 V supplies.

Abstract In this paper, we evaluate the overall performance of various magnetic-sensor signal pro... more Abstract In this paper, we evaluate the overall performance of various magnetic-sensor signal processing (mSSP) algorithms for the Tongue Drive System based on a comprehensive dataset collected from trials with a total of eight able-bodied subjects. More specifically, we measure the performance of nine classifiers on the two-stage classification used by the mSSP algorithm, in order to learn how to improve the current algorithm.

Abstract–Tongue Drive System (TDS) is a wireless and wearable assistive technology (AT) that enab... more Abstract–Tongue Drive System (TDS) is a wireless and wearable assistive technology (AT) that enables people with severe disabilities to control their computers, wheelchairs, and electronic gadgets using their tongue motion. We developed the TDS to control smartphone's (iPhone/iPod Touch) built-in and downloadable apps with a customized Bluetooth mouse module by emulating finger taps on the touchscreen.

Abstract We present an active full-wave rectifier with offset-controlled high speed comparators i... more Abstract We present an active full-wave rectifier with offset-controlled high speed comparators in standard CMOS that provides high power conversion efficiency (PCE) in high frequency (HF) range for inductively powered devices. This rectifier provides much lower dropout voltage and far better PCE compared to the passive on-chip or off-chip rectifiers.