Hangue Park - Academia.edu (original) (raw)
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Filmuniversitaet Babelsberg Konrad Wolf
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Papers by Hangue Park
IEEE Access, 2022
Motor control between the thumb and index finger is critical for holding and interacting precisel... more Motor control between the thumb and index finger is critical for holding and interacting precisely with an object. In case of an improper pinching force, especially when it stems from sensory problems, modulating the interaction gain by changing the contact surface properties is a promising solution because of its simplicity and minimal risk. In this pilot study, three healthy human subjects participated in the pinching experiment with two different surface areas to test the effect of interaction gain on motor control (88 mm 2 and 176 mm 2 as 1× and 2× surface areas). Subjects were asked to match their pinching force to the reference fingertip pressure applied to the other hand. The results demonstrated that subjects applied less force to the thumb when the contact surface area was smaller, perhaps to compensate for the increase in pressure, while the contact surface area did not change the force applied to the index finger. The ratio of the force applied to the 2× surface area to the force applied to the 1× surface area was 1.19±0.02 (Mean±STE) and 1.00±0.02 for the thumb and index finger, respectively. The pinching force was also affected by the tactile memory. When subjects pinched the 2× surface area after pinching the 1× surface area, the pinching force was higher than the one at pinching the 2× surface area from the beginning. These results suggest that environmental intervention is strong enough to bias the motor output of the sensorimotor system.
2008 38th European Microwave Conference, 2008
This paper presents an inductorless 0.1-1GHz automatic gain control (AGC) circuit comprised of a ... more This paper presents an inductorless 0.1-1GHz automatic gain control (AGC) circuit comprised of a variable gain amplifier (VGA), power detector (PD), and comparator. The VGA has a gain control range of-28~23 dB with a 1GHz 3-dB gain bandwidth using a cascode amplifier with negative capacitance. The PD shows an input power range of-30~-20 dBm using an improved unbalanced source coupled pair, which incorporates an output differential amplifier and sink current steering. The AGC circuit produces constant output power for an input power range of-48dBm~-8dBm over 0.1~1GHz without an inductor. The overall current consumption is 7.7mA under 1.5V supply. The prototype is fabricated with a 0.18-μm standard CMOS technology.
Tongue drive system (TDS) is a new wireless assistive technology (AT) that employs the power and ... more Tongue drive system (TDS) is a new wireless assistive technology (AT) that employs the power and capabilities of the human tongue, which maintains its full functionality even after severe spinal cord injuries and most neurological diseases. The TDS infers users' intentions by detecting their voluntary tongue motion, and translates them into user-defined commands. Here we present the new intraoral version of the TDS (iTDS), which has been implemented as a dental retainer.
IEEE Access, 2022
Motor control between the thumb and index finger is critical for holding and interacting precisel... more Motor control between the thumb and index finger is critical for holding and interacting precisely with an object. In case of an improper pinching force, especially when it stems from sensory problems, modulating the interaction gain by changing the contact surface properties is a promising solution because of its simplicity and minimal risk. In this pilot study, three healthy human subjects participated in the pinching experiment with two different surface areas to test the effect of interaction gain on motor control (88 mm 2 and 176 mm 2 as 1× and 2× surface areas). Subjects were asked to match their pinching force to the reference fingertip pressure applied to the other hand. The results demonstrated that subjects applied less force to the thumb when the contact surface area was smaller, perhaps to compensate for the increase in pressure, while the contact surface area did not change the force applied to the index finger. The ratio of the force applied to the 2× surface area to the force applied to the 1× surface area was 1.19±0.02 (Mean±STE) and 1.00±0.02 for the thumb and index finger, respectively. The pinching force was also affected by the tactile memory. When subjects pinched the 2× surface area after pinching the 1× surface area, the pinching force was higher than the one at pinching the 2× surface area from the beginning. These results suggest that environmental intervention is strong enough to bias the motor output of the sensorimotor system.
2008 38th European Microwave Conference, 2008
This paper presents an inductorless 0.1-1GHz automatic gain control (AGC) circuit comprised of a ... more This paper presents an inductorless 0.1-1GHz automatic gain control (AGC) circuit comprised of a variable gain amplifier (VGA), power detector (PD), and comparator. The VGA has a gain control range of-28~23 dB with a 1GHz 3-dB gain bandwidth using a cascode amplifier with negative capacitance. The PD shows an input power range of-30~-20 dBm using an improved unbalanced source coupled pair, which incorporates an output differential amplifier and sink current steering. The AGC circuit produces constant output power for an input power range of-48dBm~-8dBm over 0.1~1GHz without an inductor. The overall current consumption is 7.7mA under 1.5V supply. The prototype is fabricated with a 0.18-μm standard CMOS technology.
Tongue drive system (TDS) is a new wireless assistive technology (AT) that employs the power and ... more Tongue drive system (TDS) is a new wireless assistive technology (AT) that employs the power and capabilities of the human tongue, which maintains its full functionality even after severe spinal cord injuries and most neurological diseases. The TDS infers users' intentions by detecting their voluntary tongue motion, and translates them into user-defined commands. Here we present the new intraoral version of the TDS (iTDS), which has been implemented as a dental retainer.