Wangdo Kim - Academia.edu (original) (raw)
Papers by Wangdo Kim
Abstract: This study introduces an innovative integration of Laban Movement Analysis (LMA) with b... more Abstract: This study introduces an innovative integration of Laban Movement Analysis (LMA)
with biomechanical principles to examine the golf swing dynamics from an ecological perspective.
Traditionally, LMA focuses on the qualitative aspects of movement, often isolated from external
influences. This research bridges that gap by investigating how golfers manage and adapt to the
inertial forces of the club throughout the swing. Using motion tracking sensors and screw theory, we
analyzed the spatial movement pattern in the Kinesphere (mapped as an icosahedron) and related
it to force dynamics in the Effort Cube through the inertia tensor. The results showed significant
differences between skilled and novice golfers in terms of how efficiently they align their movements
with the club’s inertia. Skilled golfers demonstrated smoother Instantaneous Screw Axes (ISAs) and
better synchronization with inertia forces, while novice golfers exhibited more abrupt deviations.
These findings suggest that integrating qualitative movement descriptors with biomechanical models
provides deeper insights into swing efficiency, performance improvement, and injury prevention.
This combined framework offers a novel method to enhance both qualitative and quantitative analysis
of golf swings.
ISBS - Conference Proceedings Archive, 2011
By segmentation of the body, this study estimated both the natural frequency and mode shapes of t... more By segmentation of the body, this study estimated both the natural frequency and mode shapes of the mechanics of hopping, during a stance phase, using a purposely developed three degree-of-freedom state space model of the leg. The model, which was validated via comparison of measured and estimated motion data, incorporated a novel use of the Bellman-Quasilinearization technique estimators. Vertical displacements of the centre of mass of each segment (thigh, shank, and foot) were collected during a stance phase and used as observed data for unknown leg compliance parameters. It was found that the relative joint contributions to compliance during an exhaustive hopping appear to be tuned in part, to the type of foot-surface landing (input signals).
Biomedical Journal of Scientific & Technical Research, 2018
Journal of Functional Morphology and Kinesiology, Nov 18, 2016
Estimating the knee functional axis (KFA) is crucial to both correctly implanting a prosthesis an... more Estimating the knee functional axis (KFA) is crucial to both correctly implanting a prosthesis and accessing joint kinematics. Researchers have reported on the KFA mainly with regard to manual management of flexion-extension movements performed passively without any voluntary movements. Active touch and movement refers to what is ordinarily called touching-variations in skin stimulation caused by surfaces are altered together by variations in motor activity. This fact is worth noting because it is often neglected that locomotion and its surfaces form an inseparable pair. The objective of this study was to confirm the distinction between touching and being touched. We were particularly interested in measuring the instantaneous axes of the knee (IAK) during locomotion. We propose the invariant structure of the knee as an attempt to distill a kind of higher-order simplification of a knee model relative to the enormous complexities of analytical anatomical objects.
Journal of biomechanical engineering, Feb 1, 1993
A measurement system was designed to investigate longitudinal wave propagation through the lower ... more A measurement system was designed to investigate longitudinal wave propagation through the lower extremity generated from foot strikes. The principal goal of the design was to eliminate measurement time lag and amplitude reduction, such that the acceleration measured by Skin Mounted Accelerometer—SMA is equal to the actual acceleration of the bone measured by Bone Mounted Accelerometer—BMA. For accurate dynamic measurement, it is important that the gain and phase of the measurement system are as close as possible to a constant and zero, respectively, for the frequency range being covered. An in vitro experiment was carried out to simultaneously measure skin and bone accelerations. The obtained information was used for identification of a linear spring/damper model representing the interface between the BMA and the SMA. The present work showed that the SMA overestimated the BMA by 12 percent in the signals between 15–30 Hz.
Knee Surgery - Reconstruction and Replacement, 2020
We characterize the concept of a "knee axis" and further the concept of "invariant." It is now ge... more We characterize the concept of a "knee axis" and further the concept of "invariant." It is now generally recognized that one of the features of the tensegrity (prestressable to the same configuration) allows the knee tensegrity system to be in producing the knee instantaneous axis (KIA). We found that the line of the ground reaction force (GRF) vector is very close to the KIA. It aligns the knee joint with the GRF such that the reaction forces are torqueless. The reaction to the GRF will then be carried by the whole structures on the knee tensegrity instead. The use of knee tensegrity model introduces the new useful dimensions of sensitivity in foot loading to the knee axis alignment. We demonstrated a method to determine ideal placement of the tibial tunnel with respect to the KIA. Such placement in vivo has the potential to reliably produce an isokinetic graft without risk of impingement.
Biomedical Journal of Scientific & Technical Research, 2021
In contrast to the widespread assumption that the neural system generates impulses to the motor u... more In contrast to the widespread assumption that the neural system generates impulses to the motor units in the skeletal muscle fibers, Turvey [1] place high importance on the fibrous collagenous connective tissues in the body; these are seen as providing a tensional network throughout the whole body, the biomechanical properties of which provide the framework for muscular force transmission as well as for the haptic sensory system. To identify the haptic system's medium, Turvey focused on connective tissue and the conjunction of muscular, connective tissue net, and skeletal as the body's proper characterization Turvey [1]. Myers has also posed the medium as a body-wide responsive physiological network-the myofascial meridian Myers [2]. Taking on 'geometry' first, cell biologist Donald Ingber placed one final piece of the puzzle: to view the body's architecture in the light of 'tensegrity' geometry Ingber [3]. 'Tensegrity' was coined from the phrase' tension integrity' by the designer R. Buckminster Fuller (working from original structures developed by artist Kenneth Snelson Skelton [4]. As Snelson describes it Snelson [5], "The sculpture could be put into orbit in outer space, and it would maintain its form. Its forces are internally locked. These mechanical forces, compression, and tension or push and pull are invisible-just pure energy-in the same way that magnetic or electric fields are invisible." The tensegrity principle describes precisely the relationship between the connective tissues, the muscles, and the skeleton. For example, weight applied to shank/thigh bones would cause it to slide off its knee joint if it were not for the tensional balances that hold it in place and control its pivoting Swanson [6]. The invariant feature of tensegrity structures encompasses those that stabilize themselves through a phenomenon known as pre-stressing. Architects call this type of pre-stressed structural network, composed of opposing tension and compression elements that self-stabilize its shape by establishing a mechanical force balance, a tensegrity structure. Bio tensegrity is a term introduced by Dr. Stephen Levin and denotes the application of tensegrity's principles to biological structures ARTICLE INFO ABSTRACT
SM Musculoskeletal Disorders, 2018
Perceptual psychology suggested that behavior was controlled by information about the world and t... more Perceptual psychology suggested that behavior was controlled by information about the world and the self conjointly. The information has now been described. What about the control? In this article, we asserted that locomotion was controlled by rules. Surely, however, they are not rules enforced by an authority. The rules are not commands from a brain; they emerge from the human-environment system. We found that the rule is: The line of the Ground Reaction Force (GRF) vector is very close to the Knee Instantaneous Axis (KIA). It aligns the knee joint with the GRF such that the reaction forces are torqueless. The reaction to the GRF will then be carried by the whole structures on the body instead.
SM Musculoskeletal Disorders, 2016
Estimating the Knee Functional Axis (KFA) is crucial to both correctly implanting the prosthesis ... more Estimating the Knee Functional Axis (KFA) is crucial to both correctly implanting the prosthesis and accessing the joint kinematics. Researchers have mainly reported KFA by manual management of flexionextension movements, which are passively performed without any voluntary movements. Active touch and movement refers to what is ordinarily called as touching, which is defined as variations in skin stimulation caused by variations in a person's motor activity. The difference is very important for the individual. However, it has not been emphasized in the biomechanical literatures. This study aims to confirm the distinction between touching and being touched. We are particularly interested in measuring the Instantaneous Axes of the Knee (IAK) during locomotion. This geometrical "pattern" of the IAK is altered along with the touch pattern by the mechanical necessities of terrestrial movement.
The routine uses Bellman's quasilinearizaion, approximation in the policy space, to get the p... more The routine uses Bellman's quasilinearizaion, approximation in the policy space, to get the parameters (spring) to tune the surface during hopping.
Abstract: This study introduces an innovative integration of Laban Movement Analysis (LMA) with b... more Abstract: This study introduces an innovative integration of Laban Movement Analysis (LMA)
with biomechanical principles to examine the golf swing dynamics from an ecological perspective.
Traditionally, LMA focuses on the qualitative aspects of movement, often isolated from external
influences. This research bridges that gap by investigating how golfers manage and adapt to the
inertial forces of the club throughout the swing. Using motion tracking sensors and screw theory, we
analyzed the spatial movement pattern in the Kinesphere (mapped as an icosahedron) and related
it to force dynamics in the Effort Cube through the inertia tensor. The results showed significant
differences between skilled and novice golfers in terms of how efficiently they align their movements
with the club’s inertia. Skilled golfers demonstrated smoother Instantaneous Screw Axes (ISAs) and
better synchronization with inertia forces, while novice golfers exhibited more abrupt deviations.
These findings suggest that integrating qualitative movement descriptors with biomechanical models
provides deeper insights into swing efficiency, performance improvement, and injury prevention.
This combined framework offers a novel method to enhance both qualitative and quantitative analysis
of golf swings.
ISBS - Conference Proceedings Archive, 2011
By segmentation of the body, this study estimated both the natural frequency and mode shapes of t... more By segmentation of the body, this study estimated both the natural frequency and mode shapes of the mechanics of hopping, during a stance phase, using a purposely developed three degree-of-freedom state space model of the leg. The model, which was validated via comparison of measured and estimated motion data, incorporated a novel use of the Bellman-Quasilinearization technique estimators. Vertical displacements of the centre of mass of each segment (thigh, shank, and foot) were collected during a stance phase and used as observed data for unknown leg compliance parameters. It was found that the relative joint contributions to compliance during an exhaustive hopping appear to be tuned in part, to the type of foot-surface landing (input signals).
Biomedical Journal of Scientific & Technical Research, 2018
Journal of Functional Morphology and Kinesiology, Nov 18, 2016
Estimating the knee functional axis (KFA) is crucial to both correctly implanting a prosthesis an... more Estimating the knee functional axis (KFA) is crucial to both correctly implanting a prosthesis and accessing joint kinematics. Researchers have reported on the KFA mainly with regard to manual management of flexion-extension movements performed passively without any voluntary movements. Active touch and movement refers to what is ordinarily called touching-variations in skin stimulation caused by surfaces are altered together by variations in motor activity. This fact is worth noting because it is often neglected that locomotion and its surfaces form an inseparable pair. The objective of this study was to confirm the distinction between touching and being touched. We were particularly interested in measuring the instantaneous axes of the knee (IAK) during locomotion. We propose the invariant structure of the knee as an attempt to distill a kind of higher-order simplification of a knee model relative to the enormous complexities of analytical anatomical objects.
Journal of biomechanical engineering, Feb 1, 1993
A measurement system was designed to investigate longitudinal wave propagation through the lower ... more A measurement system was designed to investigate longitudinal wave propagation through the lower extremity generated from foot strikes. The principal goal of the design was to eliminate measurement time lag and amplitude reduction, such that the acceleration measured by Skin Mounted Accelerometer—SMA is equal to the actual acceleration of the bone measured by Bone Mounted Accelerometer—BMA. For accurate dynamic measurement, it is important that the gain and phase of the measurement system are as close as possible to a constant and zero, respectively, for the frequency range being covered. An in vitro experiment was carried out to simultaneously measure skin and bone accelerations. The obtained information was used for identification of a linear spring/damper model representing the interface between the BMA and the SMA. The present work showed that the SMA overestimated the BMA by 12 percent in the signals between 15–30 Hz.
Knee Surgery - Reconstruction and Replacement, 2020
We characterize the concept of a "knee axis" and further the concept of "invariant." It is now ge... more We characterize the concept of a "knee axis" and further the concept of "invariant." It is now generally recognized that one of the features of the tensegrity (prestressable to the same configuration) allows the knee tensegrity system to be in producing the knee instantaneous axis (KIA). We found that the line of the ground reaction force (GRF) vector is very close to the KIA. It aligns the knee joint with the GRF such that the reaction forces are torqueless. The reaction to the GRF will then be carried by the whole structures on the knee tensegrity instead. The use of knee tensegrity model introduces the new useful dimensions of sensitivity in foot loading to the knee axis alignment. We demonstrated a method to determine ideal placement of the tibial tunnel with respect to the KIA. Such placement in vivo has the potential to reliably produce an isokinetic graft without risk of impingement.
Biomedical Journal of Scientific & Technical Research, 2021
In contrast to the widespread assumption that the neural system generates impulses to the motor u... more In contrast to the widespread assumption that the neural system generates impulses to the motor units in the skeletal muscle fibers, Turvey [1] place high importance on the fibrous collagenous connective tissues in the body; these are seen as providing a tensional network throughout the whole body, the biomechanical properties of which provide the framework for muscular force transmission as well as for the haptic sensory system. To identify the haptic system's medium, Turvey focused on connective tissue and the conjunction of muscular, connective tissue net, and skeletal as the body's proper characterization Turvey [1]. Myers has also posed the medium as a body-wide responsive physiological network-the myofascial meridian Myers [2]. Taking on 'geometry' first, cell biologist Donald Ingber placed one final piece of the puzzle: to view the body's architecture in the light of 'tensegrity' geometry Ingber [3]. 'Tensegrity' was coined from the phrase' tension integrity' by the designer R. Buckminster Fuller (working from original structures developed by artist Kenneth Snelson Skelton [4]. As Snelson describes it Snelson [5], "The sculpture could be put into orbit in outer space, and it would maintain its form. Its forces are internally locked. These mechanical forces, compression, and tension or push and pull are invisible-just pure energy-in the same way that magnetic or electric fields are invisible." The tensegrity principle describes precisely the relationship between the connective tissues, the muscles, and the skeleton. For example, weight applied to shank/thigh bones would cause it to slide off its knee joint if it were not for the tensional balances that hold it in place and control its pivoting Swanson [6]. The invariant feature of tensegrity structures encompasses those that stabilize themselves through a phenomenon known as pre-stressing. Architects call this type of pre-stressed structural network, composed of opposing tension and compression elements that self-stabilize its shape by establishing a mechanical force balance, a tensegrity structure. Bio tensegrity is a term introduced by Dr. Stephen Levin and denotes the application of tensegrity's principles to biological structures ARTICLE INFO ABSTRACT
SM Musculoskeletal Disorders, 2018
Perceptual psychology suggested that behavior was controlled by information about the world and t... more Perceptual psychology suggested that behavior was controlled by information about the world and the self conjointly. The information has now been described. What about the control? In this article, we asserted that locomotion was controlled by rules. Surely, however, they are not rules enforced by an authority. The rules are not commands from a brain; they emerge from the human-environment system. We found that the rule is: The line of the Ground Reaction Force (GRF) vector is very close to the Knee Instantaneous Axis (KIA). It aligns the knee joint with the GRF such that the reaction forces are torqueless. The reaction to the GRF will then be carried by the whole structures on the body instead.
SM Musculoskeletal Disorders, 2016
Estimating the Knee Functional Axis (KFA) is crucial to both correctly implanting the prosthesis ... more Estimating the Knee Functional Axis (KFA) is crucial to both correctly implanting the prosthesis and accessing the joint kinematics. Researchers have mainly reported KFA by manual management of flexionextension movements, which are passively performed without any voluntary movements. Active touch and movement refers to what is ordinarily called as touching, which is defined as variations in skin stimulation caused by variations in a person's motor activity. The difference is very important for the individual. However, it has not been emphasized in the biomechanical literatures. This study aims to confirm the distinction between touching and being touched. We are particularly interested in measuring the Instantaneous Axes of the Knee (IAK) during locomotion. This geometrical "pattern" of the IAK is altered along with the touch pattern by the mechanical necessities of terrestrial movement.
The routine uses Bellman's quasilinearizaion, approximation in the policy space, to get the p... more The routine uses Bellman's quasilinearizaion, approximation in the policy space, to get the parameters (spring) to tune the surface during hopping.
Estimating the knee functional axis (KFA) is crucial to both correctly implanting the prosthesis ... more Estimating the knee functional axis (KFA) is crucial to both correctly implanting the prosthesis and accessing the joint kinematics. Researchers have mainly reported KFA by manual management of flexion–extension movements, which are passively performed without any voluntary movements. Active touch and movement refers to what is ordinarily called as touching, which is defined as variations in skin stimulation caused by variations in a person’s motor activity.
The difference is very important for the individual. However, it has not been emphasized in the biomechanical literatures. This study aims to confirm the distinction between touching and being touched. We are particularly interested in measuring the instantaneous axes of the knee (IAK) during locomotion. This geometrical “pattern” of the IAK is altered along with the touch pattern by the mechanical necessities of terrestrial movement.