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Park, Seungbum,Lee, Kyungdeuk,Kim, Daewoong,Yoo, Junghyeon,Jung, Jaemin,Park, Kyunghwan,Park, Sungwon,Kim, Jinhoon Korean Society of Sport Biomechanics 2016 한국운동역학회지 Vol.26 No.3
Objective: The aim of this study was to analyze effects of the toe-spring angle of bobsleigh shoes on start speed lap time to develop Korean-specific bobsled shoes suitable for winter environments and for domestic players on the basis of sports science and optimized biomechanical performance. Method: Seven Korean bobsleigh athletes participated in this study, with three pairs of sprint spikes from three companies (Type A, Type B, Type C). To analyze sprint lap time and forefoot bending angle for each shoe, participants were instructed to drag a sled 15 meters from the start line at a maximum sprint. forefoot bending angle was collected by a high speed camera, and lap time speed was measured. Results: Lap time for type B shoes was $3.52{\pm}0.17sec$, type A was $3.55{\pm}0.19sec$, and type C was $3.56{\pm}0.18sec$. Forefoot bending angles were: angle 1, $6.88{\pm}5.55^{\circ}$; angle 2, $9.23{\pm}6.38^{\circ}$; angle 3, $15.56{\pm}5.39^{\circ}$; angle 4, $9.54{\pm}3.85^{\circ}$; angle 5, $9.22{\pm}5.08^{\circ}$; angle 6, $7.66{\pm}6.44^{\circ}$; and angle 7, $4.30{\pm}6.24^{\circ}$ (p<.001). Forefoot bending in angle 3 was as follows: type A, $16.47{\pm}6.01^{\circ}$; type B, $14.30{\pm}4.96^{\circ}$; and type C, $15.90{\pm}5.17^{\circ}$. Conclusion: Hard outsoles and midsoles are better than soft type for reduced start lap time when developing a prototype Korean bobsled shoe.
Park, Seungbum,Lee, Kyungdeuk,Kim, Daewoong,Yoo, Junghyeon,Jung, Jaemin,Park, Kyunghwan Korean Society of Sport Biomechanics 2017 한국운동역학회지 Vol.27 No.4
Objective: The bobsleigh shoes used in the start section are one of the most important equipment for improving the competition. Despite the importance of the start section, there are no shoes that are specific for bobsleigh athletes in Korea and Korean athletes have to wear sprint spike shoes and practice the start instead of wearing bobsleigh shoes. The objective of the present study was to provide data for improving the performance of Korean bobsleigh athletes by investigating the differences in their split time, plantar pressure, and forefoot bending angle based on skill levels at the start of a run under the same conditions as training conditions. Method: Six Korean bobsleigh athletes were divided into two groups, superior (n=3) and non-superior (n=3). A digital speedometer measured the split time at the start; the Pedar-X system (Novel, Germany) measured plantar pressure. Plantar pressures and split times were measured as the athletes pushed a bobsleigh and sprinted at full speed from the start line to the 10-m mark on the bobsleigh track. An ultra-high-speed camera was used to measure the forefoot bending angle during the start phase. Results: Significant between-group differences were found in split times (p<.000; superior = 2.38 s, non-superior = 2.52 s). The superior group had a larger rearfoot (p<.05) contact area, maximum rearfoot force (p<.01), and a larger change in angles 3 and 4 (p<.05). Conclusion: At the start of a bobsleigh run, proper use of the rearfoot for achieving effective driving force and increasing frictional resistance through a wider frictional force can shorten start time.
Nontraumatic Myositis Ossificans After Spontaneous Subarachnoid Hemorrhage: A Case Report
Park Eunjin,Park Junghyeon,Chang So-youn,Kim Youngkook 대한뇌신경재활학회 2024 뇌신경재활 Vol.17 No.1
Myositis ossificans is uncommon in patients with nontraumatic brain injuries. This report presents a challenging case in which myositis ossificans was diagnosed and treated by medical management in a patient who was unable to complain of any symptoms due to akinetic mutism that occurred after nontraumatic subarachnoid hemorrhage. The patient had intermittent high-grade fever, and laborator y tests showed elevated C-reactive protein and D-dimer levels without clinical signs of infection two months after subarachnoid hemorrhage. Lower-extremity venography using computed tomography was performed to rule out deep venous thrombosis. There was no thrombus, but right vastus medialis muscle showed inflammator y change with faint multilayered cur vilinear hyperdense rims. The administration of indomethacin helped prevent abnormal bone formation. For the early detection of myositis ossificans, careful obser vation of clinical presentation and a high index of clinical suspicion is necessar y in brain-injured patients. Further, elevated serum inflammator y markers accompanied by elevated alkaline phosphatase can be a critical clue. Early computed tomography helps identif y early ‘string sign’ prior to characteristic ossification. Our report highlights that the myositis ossificans is remediable by early detection and appropriate nonsurgical management
An Intelligent Ankle Stretching Device for Rehabilitation Patients
Junghyeon Choi,Jongman Cho,Taewoo Nam,Junho Park,Inseon Park-Ko 대한전자공학회 2007 ITC-CSCC :International Technical Conference on Ci Vol.2007 No.7
This paper describes a rehabilitation device developed for replacement of a conventional wooden wedge type ankle stretching device (ASD). This device consists of two inclinometer sensors and microcontroller-controlled electro-mechanical actuators. A conventional ASD has been used for lower limb rehabilitation treatment for training of monoplegia (hemiplegia) patients for a long time. The developed ASD device can control automatically the angle between foot and calf (AFC), holding time and number of repetition, and has four training modes. It consists of an embedded controller unit (ECU), a display unit and an actuator unit. The ECU consists of two clinometers, a 12-bit serial ADC, microcontroller, RS-232 serial interface with the display unit and the actuator unit consists of electro-mechanical actuators. It can reduce the workload of physical therapists and improve the effect of rehabilitation exercise for lower limb monoplegia patients.
Park, Seungbum,Lee, Kyungdeuk,Kim, Daewoong,Yoo, Junghyeon,Jung, Jaemin,Park, Kyunghwan Korean Society of Sport Biomechanics 2017 한국운동역학회지 Vol.27 No.3
Objective: The aim of this study was to analyze the effects of bobsleigh shoes on the lower extremity range of motion and start speed lap time and to develop bobsleigh shoes suitable for winter environments and Korean players based on sports science and optimized biomechanical performance. Background: The bobsleigh shoes used in the start section of the sport are one of the most important equipment for improving athletes' performances. Despite the importance of the start section, there are no shoes that are specifically designed for Korean bobsleigh athletes. Thus, Korean athletes have to wear sprint spike shoes instead of bobsleigh shoes to practice the start. Method: The subjects included four bobsleigh athletes from the Gangwon Province Bobsleigh Skeleton Federation. The study selected the bobsleigh shoe type A (company A) and type B (company B). We analyzed the lower extremity range of motion and sprint time (start line to 10 m) using a Motion Analysis System (USA). Results: In the measurement of the time required for the bobsleigh start section (10 m), the type A shoes demonstrated the fastest section record by $2.765{\pm}0.086sec$ and yielded more efficient movements, hip and knee flexion, hip extension, ankle dorsiflexion, plantar flexion, and inversion than the type B shoes. Conclusion: Type A shoes can yield a better performance via effective lower extremity movements in the bobsleigh start section. Application: In the future, functional analysis should be conducted by comparing the upper material properties, comfort, and muscle fatigue of bobsleigh shoes based on the Type A shoes to develop such shoes suitable for Koreans.
( Seungbum Park ),( Kyungdeuk Lee ),( Daewoong Kim ),( Junghyeon Yoo ),( Jaemin Jung ),( Kyunghwan Park ) 한국운동역학회 2017 한국운동역학회지 Vol.27 No.3
Objective: The aim of this study was to analyze the effects of bobsleigh shoes on the lower extremity range of motion and start speed lap time and to develop bobsleigh shoes suitable for winter environments and Korean players based on sports science and optimized biomechanical performance. Background: The bobsleigh shoes used in the start section of the sport are one of the most important equipment for improving athletes` performances. Despite the importance of the start section, there are no shoes that are specifically designed for Korean bobsleigh athletes. Thus, Korean athletes have to wear sprint spike shoes instead of bobsleigh shoes to practice the start. Method: The subjects included four bobsleigh athletes from the Gangwon Province Bobsleigh Skeleton Federation. The study selected the bobsleigh shoe type A (company A) and type B (company B). We analyzed the lower extremity range of motion and sprint time (start line to 10 m) using a Motion Analysis System (USA). Results: In the measurement of the time required for the bobsleigh start section (10 m), the type A shoes demonstrated the fastest section record by 2.765±0.086 sec and yielded more efficient movements, hip and knee flexion, hip extension, ankle dorsiflexion, plantar flexion, and inversion than the type B shoes. Conclusion: Type A shoes can yield a better performance via effective lower extremity movements in the bobsleigh start section. Application: In the future, functional analysis should be conducted by comparing the upper material properties, comfort, and muscle fatigue of bobsleigh shoes based on the Type A shoes to develop such shoes suitable for Koreans.
( Seungbum Park ),( Kyungdeuk Lee ),( Daewoong Kim ),( Junghyeon Yoo ),( Jaemin Jung ),( Kyunghwan Park ),( Sungwon Park ),( Jinhoon Kim ) 한국운동역학회 2016 한국운동역학회지 Vol.26 No.3
Objective: The aim of this study was to analyze effects of the toe-spring angle of bobsleigh shoes on start speed lap time to develop Korean-specific bobsled shoes suitable for winter environments and for domestic players on the basis of sports science and optimized biomechanical performance. Method: Seven Korean bobsleigh athletes participated in this study, with three pairs of sprint spikes from three companies (Type A, Type B, Type C). To analyze sprint lap time and forefoot bending angle for each shoe, participants were instructed to drag a sled 15 meters from the start line at a maximum sprint. forefoot bending angle was collected by a high speed camera, and lap time speed was measured. Results: Lap time for type B shoes was 3.52±0.17 sec, type A was 3.55±0.19 sec, and type C was 3.56±0.18 sec. Forefoot bending angles were: angle 1, 6.88±5.55°; angle 2, 9.23±6.38°; angle 3, 15.56±5.39°; angle 4, 9.54±3.85°; angle 5, 9.22±5.08°; angle 6, 7.66±6.44°; and angle 7, 4.30±6.24° (p<.001). Forefoot bending in angle 3 was as follows: type A, 16.47±6.01°; type B, 14.30±4.96°; and type C, 15.90±5.17°. Conclusion: Hard outsoles and midsoles are better than soft type for reduced start lap time when developing a prototype Korean bobsled shoe.
A Robust Heart Rate Monitoring System Based on RF Communication Protocol
Junho Park,Jongman Cho,Taewoo Nam,Junghyeon Choi 대한전자공학회 2007 ITC-CSCC :International Technical Conference on Ci Vol.2007 No.7
A robust and real time heart rate monitoring system for multiple rehabilitation patients which can be used in a rehabilitation hospital was developed. A customized wireless network was proposed in this study to provide patients with full mobility during exercising and to save electrical power consumtion in portable units. The system consists of patient’s side device (PSD) and central monitoring system (CMS). The PSD calculates a patient’s heart rate continuously and send it to CMS when it gets call from CMS. The CMS collects heart rate for each patient sequentially and generates warning signal if the heart rate is out of preset range. The PSD was designed to be wearable and consume minimum electrical power.