• Journal of the Korea Academia-Industrial cooperation Society
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• v.11 no.11
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• pp.4522-4528
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• 2010

The single phase switched reluctance motor has simple, robust structure and economical drive system. So, it is useful to apply in the industrial and home applied machines. Especially, the single phase induction motor, used much in field, has a low efficiency and control ability. For the replacement of it, the single phase SRM is presented. In this paper, the design and characteristics of single phase SRM considering the rotor shape will be presented in the base of general electric motor design method and poly phase SRM design method.

• Progress in Superconductivity and Cryogenics
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• v.26 no.1
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• pp.1-4
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• 2024

This study explores the use of a bulk type high-temperature superconductors (HTS) as trapped field magnets in synchronous motors. A HTS bulk is examined for its ability to generate powerful magnetic fields over a permanent magnet and to eliminate the need for a direct power supply connection compared to a tape form of HTS. A 150 kW interior-mounted bulk-type superconducting synchronous motor is designed and analyzed. The A-H formulation is used to numerical analysis. The results show superior electrical performance and weight reduction when comparing the designed model with the conventional permanent magnet synchronous motor of the same topology. This study presents HTS bulk synchronous motor's overall design process and highlights its potential in achieving relatively high power density than conventional permanent magnet synchronous motor.

• Educational Technology International
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• v.13 no.2
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• pp.283-312
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• 2012

Problem-solving ability is one of the most important learning outcomes for students to compete and accomplish in a knowledge-based society. It has been empirically proven that visualization plays a central role in problem-solving. The best performing problem-solver might have a strong visualization tendency. However, there is little research as to what factors of visualization tendency primarily related to problem-solving ability according to phases of problem-solving. The purpose of this study is to identify the relationship between visualization tendency and problem-solving ability, to determine which factors of visualization tendency influence problem-solving ability in each phase of problem-solving, and to examine different problem-solving ability from the perspective of the levels of visualization tendency. This study has found out that visualization tendency has a significant correlation with problem-solving ability. Especially, Generative Visualization and Spatial-Motor Visualization as sub-visualization tendency were more strongly related to each phase of problem-solving. It indicates that visualization tendency to generate and operate mental processing can be considered a major cognitive skill to improve problem-solving ability. Furthermore, students who have high visualization tendency also have significantly higher problem-solving ability than students with low visualization tendency. It shows that the levels of visualization tendency can predict variables related to students' problem-solving ability.

• Proceedings of the KIPE Conference
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• 1999.07a
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• pp.303-306
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• 1999

Traction system of 2-motor driven electric vehicle(EV) is consisted of motor(IPMSM), inverter, and battery. In order to enhance dynamic characteristics of the system, such driving conditions as acceleration ability and load(current magnitude) should be considered in the vector control algorithm for the IPMSM. So, in this paper, the most suitable structure of vector control algorithm for the EV is considered. Conformity had been verified through experimental results.

• Proceedings of the KIEE Conference
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• 2005.04a
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• pp.96-98
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• 2005

This paper presents a new two-phase linear hybrid stepping motors (LHSM), which has two windings per phase and one of them shares the other phase winding. The proposed motor shows a unique ability to deliver low cogging force without any particular complex control scheme and additional power electronics hardware in micro stepping control. An analytical and experimental comparison between conventional and proposed LHSM is evaluated to confirm the effectiveness of the proposed design.

• Journal of Korean Physical Therapy Science
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• v.10 no.2
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• pp.17-28
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• 2003

The aim of this study was to investigate the effects of treadmill gait training on the functional characteristics and the temporal-distance parameters of gait in hemiplegic patients, as compared with conventional gait training. The subjects of this study were 32 hemiplegic patients who had been admitted or were visited out-patients at Kangdong Sacred Heart Hospital, Hallym University, from March 3 through April 25, 2003. These subjects were randomly divided into treadmill gait training group or conventional gait training group. We evaluated the gait ability, motor functions, muscle strength, spasticity, physiological cost index, and temporal-distance parameters. We analyzed the changes between pre and post training in each groups, and the difference between two groups. Temporal-distance parameters were obtained using the ink footprint method and then energy consumption using physiological cost index. The results were as follows: 1. After a six-week training, treadmill gait training group significantly improved, as. compared to pre-training, in gait ability, motor functions for the leg and trunk and gross function, muscle strength of the lower limb, gait speed, cadence, step length both on the affected and on the unaffected side, step length symmetry, and energy consumption(p<0.05). 2. After a six-week training, conventional gait training group significantly improved, as compared to pretraining, in gait ability, motor functions for the leg and trunk, muscle strength of the lower limb, spasticity the upper limb, gait speed, cadence, step length both on the affected and on the unaffected side, and energy consumption(p<0.05). 3. After a six-week training, the treadmill gait training group significantly improved, as compared to the conventional gait, training, in gait speed and step length on the unaffected side. These results show that treadmill gait training was improved gait speed and step length on the unaffected side of hemiplegic patients, as compared with conventional gait training. Further research is needed to confirm the generalization of these findings and to identify which hemiplegic patients might benefit from treadmill gait training.

• Journal of The Korean Society of Integrative Medicine
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• v.7 no.3
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• pp.51-59
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• 2019

Purpose : To evaluate the effect of comprehensive art therapy on physical function and activities of daily living in children with cerebral palsy (CP). Methods : Ten ambulant children with diplegic (n=8) or hemiplegic (n=2) CP participated in this study. All were randomly assigned to either the art therapy group (n=5) or the control group (n=5). Both groups received physical therapy based on neurodevelopmental techniques for 20 minutes a day, 1 day a week, for a period of 12 weeks. Children in the art therapy group received additional comprehensive art therapy for 70 minutes once a week for 3 months. Tests for various measurements-Motricity Index (MI) for strength, Trunk Control Test (TCT) for trunk ability, Gross Motor Function Measure (GMFM) and Gross Motor Function Classification System (GMFCS) for gross motor function, Denver Developmental Screening Test-II (DDST-II) for developmental milestones, Functional Independence Measure of Children (WeeFIM) for abilities to complete daily activities, Leg and Hand Ability Test (LHAT) for limb function-were performed before and after treatments. Results : The upper extremity and whole extremity strengths of MI, self-care and total scores of WeeFIM, and leg and arm functions of LHAT improved significantly only for individuals in the art therapy group after the art therapy (p<.05). The value of MI after treatment was at the upper extremity and whole extremity strengths the leg function of LHAT was also significantly improved compared to the control group (p<.05). Conclusion : This study revealed that comprehensive art therapy along with physiotherapy was effective in increasing upper extremity strength and leg ability in children with CP. This suggests that comprehensive art therapy may be a useful adjunctive therapy for children with CP.

• The Journal of Korean Academy of Sensory Integration
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• v.14 no.1
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• pp.31-40
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• 2016

Objective : This study aimed to provide the preliminary data as a pilot study on standardizing BOT-2 by using an assessment criteria linked to Bruininks-Oseretsky Test of Motor Proficiency (BOTMP) short form for the children with preschool years(4-6 year old) in South Korea. Methods : A total of 81 children aged 4-6 in Busan and Gimhae were participated in this study. They were evaluated by using BOT-2 SF. It provides the average values and standard deviations about the abilities of praxis along with descriptive statistical analyses, and has the verification of gender differences by using independent t-test and using ANOVA for discrepancies in the abilities of praxis. Results : There were significance difference in the total raw score between four and five (p=.000), the items on fine motor accuracy between five and six year olds (p=.014). Girls showed higher scores than boys in fine motor accuracy, fine motor integration and balance (p=.022, p=.006, p=.031). Also, mean raw scores of 4 and 5 year olds (p=.007, =.000), and the all age group's standard scores were higher than the age in American children who were the participants of BOT-2. Conclusion : This study suggested the average of each item with regard to the ability of motor praxis about the children of preschool ages and showed the dissimilarity in the ability of motor praxis between age and gender, also between the participants in this study and American children who were participants of BOT-2. The research could provide basic data for future studies to standardize BOT-2 SF for korean preschoolers.

• The Journal of Korean Physical Therapy
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• v.22 no.4
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• pp.7-14
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• 2010

Purpose: The goal of this study was to investigate the effect of balance and gait ability through two motor dual task training in chronic stroke subjects. Methods: A group of twenty-five subjects who were six months post stroke participated in this study, where they were designated into pretest-posttest control The subjects were randomly allocated into two groups: experimental (n=13) and control (n=12). Both groups received physical therapy for 5 session 30 minutes per week during 6 weeks. Experimental group practiced additional two motor dual task training programs for thirty minutes a day, three days a week during six weeks. Evaluation of results was obtained through analyzing static balance, dynamic balance and gait function. Results: There was significant improvement among the group that practiced the additional two motor dual task training in that the postural sway area with open eye and close eye on the foam surface, the dynamic balance (p<0.05), and the gait function (p<0.05). Conclusion: Two motor dual task training improved static balance on the foam, dynamic balance, gait function. These results suggest that two motor dual task training is a feasible and suitable treatment for individuals with chronic stroke.

• Journal of Oriental Neuropsychiatry
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• v.21 no.1
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• pp.13-42
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• 2010

Objectives: This study is to investigate the method for assesment of cerebral palsy(CP), especislly focusing on function assesment Methods: We searched the recent date of the publication and paper in Cerebral Palsy Results: Measuring the function of children with cerebral palsy is mobility, self-care and social ability. Early adequate evaluation of motor development and prognosis of degree of long-term motor disability is very important not only for parents, but also for correct management of goal oriented rehabilitation treatment and for planning of preventive measures. 1. Gross Motor Function Classification System(GMFCS) is valuable to prognostication about gross motor progress in children with CP, using longitudinal observation. 2. Gross Motor Function Measure(GMFM) is the instrument most commonly used to measure gross motor function in children with cerebral palsy(CP). 3. Pediatric Evaluation of Disability Inventory(PEDI) is one of the most commonly used assessments for children with a disability. Conclusions: The functional Assesment of children with CP are used GMFCS, GMFM and PEDI.