• Clinical and Experimental Pediatrics
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• v.57 no.7
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• pp.310-316
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• 2014

Purpose: Prader-Willi syndrome (PWS) is a complex genetic disorder that results from the lack of paternally expressed genes in the chromosome 15q11-q13 region. This study was performed to delineate the clinical features of PWS infants and toddlers and the effects of two-year growth hormone (GH) treatment according to gender and age at the start of treatment. Methods: The clinical characteristics and the results of the GH treatment were reviewed retrospectively for 30 PWS patients diagnosed by molecular genetic testing and clinical manifestations. Results: The mean age at diagnosis with PWS was 13.7 months (2-47 months of age). All patients showed the characteristics of facial dysmorphism, including brown hair and almond-shaped eyes. Most patients showed developmental delays/mental retardation (93.3%), cryptorchidism (75%), feeding problems in infancy (73.3%), and neonatal or infantile hypotonia (66.7%). Among 30 patients, 14 PWS infants and toddlers had been treated with GH for more than two years. Two years of GH treatment resulted in an improvement in head circumference-standard deviation score (HC-SDS), body weight-SDS, insulin-like growth factor-1 (IGF-1) SDS, IGF binding protein-3 (IGFBP-3) SDS, lean body mass, and bone mineral content, especially in IGFBP-3 SDS and motor development in PWS patients younger than two years of age. There was significant increase in IGF-1 SDS and IGFBP-3 SDS among male PWS patients after GH treatment. Conclusion: Our study showed increases in IGFBP-3 SDS and an improvement in motor development among individuals under two years of age after GH treatment, and significant difference in IGF-1 SDS and IGFBP-3 SDS by gender.

• Journal of Advanced Marine Engineering and Technology
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• v.36 no.1
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• pp.172-178
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• 2012

Packaged power systems are very convenient for transferring and installing, and can supply electric power steadily for the areas which have a great difficulty in drawing power line from the outside. Then, the equipments have been widely used in such mountain areas and the back of beyond. Generally, compressed air has been employed to start the dynamo-engines for P.P.S. However, these systems necessitate air compressors, air tanks, air starting motors and pipe lines for transferring compressed air etc. Recently, starting systems which have only batteries and series DC motors as whole automobiles have been applied due to their simplicity and economy. In this paper, developed new starting motor for the P.P.S. And we achieved the better results from performance tests.: Output power, torque and speed.

• The Journal of Korean Physical Therapy
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• v.13 no.3
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• pp.799-814
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• 2001

This study was performed to investigate the clinical pictures and rehabilitation service patterns of stroke patients in cities of kimchon(kumi), jinju. pohwang, jeonju and jeju from January 1,2001 to march. Authors developed structured questionnaire, and distributed it to each physical therapist. Total number of distributed questionnaire was 400, and 301 questionnaire were col looted and analysed finally.1. The occurrence rate of hemorrhagic stroke(60.5%) was higher than that of ischemic stroke(39.5%). The highest incidence of the stroke was noted in the group of 50 years and ratio of male to female 1.3 : 1. 2. The several warning sign is motor deficit(42.5%). headache. dizziness, vomitting(31.9%) and difficulty speaking or understanding(10.6%). 3. The most important contributing factor of stroke was hypertension both hemorrhagic(50.0%) and ischemic stroke(40.3%). 4. In the painful stroke patients(53.2%). the major problems were shoulder pain(51.3%) and shoulder-hand syndrom(31.3%). 5. In hemorrhagic stroke. the seasonal preference was autumn and summer. In ischemic stroke. the seasonal preference was autumn and winter. 6. In the surgery, hemorrhgic stroke(44.5%) was higher than that of ischemic stroke(20.2%). 7 The major impairment were motor deficit(95.3%), psychological deficits(24.4%), hearing and speech deficit(23.4%). vision deficit(14.7%) and perception deficit(12.7%). 8. The rehabilitation services for stroke patients were physical therapy(98.0%), occupational therapy(41.5%), oriental therapy(35.1%), speech therapy(17.5%) and psychological therapy(7.4%). 9. The start of rehabilitation service was different according to surgery. 36.5% of patients started physical therapy in 4 week and 32.0% of patients started in 8 week later in surgery and 53.1% of patients started physical therapy in 2 week in not surgery( P<0.05). 10. The highest frequency of rehabilitation service was six times per week.

• The Transactions of the Korean Institute of Power Electronics
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• v.9 no.1
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• pp.17-24
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• 2004

The starter of the turbo generator is composed of a high speed generator(HSG), an inverter and a boost converter instead of a gearbox, a DC motor and a low-voltage battery in the starter of the turbo shaft generation system. Because turbo generator is needed a high speed motoring at start-up, high speed generator has a low leakage inductance and inverter need a high DC link voltage. In this study, for developing the stater of a turbo generator, a boost converter with a high capacity was developed to convert high voltage from a low battery voltage. And for controlling a high frequency current to be injected to a motor winding with a low leakage inductance, the inverter with a high precision and a high speed operation was designed and for a stable ignition, the starting algorithm of a turbo generator was proposed. Turbo generator was started by the starter developed to verify the performances.

• Journal of the Korean Institute of Illuminating and Electrical Installation Engineers
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• v.19 no.2
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• pp.114-123
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• 2005

A nonlinear speed control of a PMSM using a sequential parameter auto-tuning algorithm for servo equipments is presented. The nonlinear control scheme gives an undesirable output performance under the mismatch of the system parameters and load conditions. Recently, to improve the performance, an adaptive linearization scheme, a sliding mode control and an observer-based technique have been reported. Although a good performance can be obtained, the performance is not satisfactory any more under specific conditions such as a large inertia variation, a fast speed transient or an increased sampling time. The simultaneous estimation of principal parameters giving a direct influence on speed dynamics is generally not simple. To overcome this problem, a a sequential parameter auto-tuning algorithm at start-up is proposed, where dominant parameters are estimated in a prescribed regular sequence based on the method that one parameter is estimated during each interval. The proposed scheme is implemented on a PMSM using DSP TMS320C31 and the effectiveness is verified through simulations and experiments.

• The Journal of Internal Korean Medicine
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• v.24 no.2
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• pp.283-289
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• 2003

Background and Purpose : Hemiplegic upper extremity is a problem frequently encountered in the rehabilitation of patients with stroke. In Korean traditional medicine, moxibustion has been used clinically in treatment of stroke patients with hemiplegia. So far, its efficacy has not been proven clinically. The purpose of this study was to evaluate the efficacy of the moxibustion in treating hemiplegic upper extremity in stroke patients. Design : Randomized Control Trial. Subjects and Methods : Forty hemiplegic stroke patients admitted to Kyunghee oriental medicine hospital were randomized into the treatment with standard physiotheraphy combined with Moxibustion-group or Control-group with standard physiotherapy alone. It took them 2-5 weeks from the onset to start this study. Moxibustion was applied at LI4(合谷), LI11(曲池), TE3(中渚), TE5(外關) in hemiplegic hand, once a day for 2weeks. The effect of treatment on hemiplegic upper extremity was assessed using Fugl-Myer motor scale, Motricity Index and Modified Barthel Index(drinking/feeding, dressing upper body, grooming) Results : These 2 groups had comparable clinical characteristics; sex, age, plegic side (Rt., Lt.), pretreatment impairment. After two weeks, patients in the moxibustion group perfomed better on Fugl-Myer test and Motricity index test. The differences were significant.(P=0.038, 0.002) But Results on the Modified Barthel Index revealed no effect.(P=0.348) Conclusion : This results suggest that moxibustion is an effective treatment for improvement of motor function of hemiplegic upper extremity.

• Tribology and Lubricants
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• v.39 no.2
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• pp.81-85
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• 2023

This study presents an experimental investigation of the effects of surface roughness on gas foil thrust bearing (GFTB) performance. A high-speed motor with the maximum speed of 80 krpm rotates a thrust runner and a pneumatic cylinder applies static loads to the test GFTB. When the motor speed increases and reaches a specific speed at which a hydrodynamic film pressure generated within the gap between the thrust runner and test GFTB is enough to support the applied static load, the thrust runner lifts off from the test GFTB and the friction mechanism changes from the boundary lubrication to the hydrodynamic lubrication. The experiment shows a series of lift-off test and load-carrying capacity test for two thrust runners with different surface roughnesses. For a constant static load of 15 N, thrust runner A with its lower surface roughness exhibits a higher start-up torque but lower lift-off torque than thrust runner B with a higher surface roughness. The load capacity test at a rotor speed of 60 krpm reveals that runner A results in a higher maximum load capacity than runner B. Runner A also shows a lower drag torque, friction coefficient, and bearing temperature than runner B at constant static loads. The results imply that maintaining a consistent surface roughness for a thrust runner may improve its static GFTB performance.

• Transactions of the Korean Society of Automotive Engineers
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• v.17 no.2
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• pp.118-125
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• 2009

Calculation of indicated mean effective pressure(IMEP) requires high cylinder pressure sampling rate and heavy computational load. Because of that, it is difficult to implement in a conventional electronic control unit. In this paper, a cylinder pressure based real-time IMEP estimation method is proposed for controller implementation. Crank angle at 10-bar difference pressure($CA_{DP10}$) and cylinder pressure difference between $60^{\circ}$ ATDC and $60^{\circ}$ BTDC($DP_{deg}$) are used for IMEP estimation. These pressure variables can represent effectively start of combustion(SOC) and fuel injection quantity respectively. The proposed IMEP estimation method is validated by transient engine operation using a common-rail direct injection diesel engine.

• Transactions of the Korean Society for Noise and Vibration Engineering
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• v.19 no.8
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• pp.788-794
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• 2009

Various types of latch designs for hard disk drives using load/unload mechanism have been introduced to protect undesired release motions of a voice coil motor(VCM) actuator from sudden disturbances. Recently, various inertia-type latches have been widely used because locking performance is better than that of other types of latch. However there has been a limit in the inertia type in order to guarantee perfect latch and unlatch operations because of changes in latch/unlatch conditions due to mechanical tolerance and temperature-dependent friction. In this paper, a reliable and robust magnetic latch mechanism is proposed through only simple modifications of coil and yoke shapes in order to overcome the mechanical limit of current inertia-type latches. This new magnetic latch does not have only a simple structure but it also ensures reliable operations and anti-shock performance. The operating mechanism of the proposed latch is theoretically analyzed and optimally designed using an electromagnetic simulation.

• Proceedings of the Korean Society for Noise and Vibration Engineering Conference
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• 2005.05a
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• pp.467-472
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• 2005

Load/Unload(L/UL) technology includes the benefits, that is, increased areal density, reduced power consumption and improved shock resistance contrary to contact start stop(CSS). It has been widely used in portable hard disk drive and will become the key technology for developing the small form factor hard disk drive. The main objectives of L/UL are no slider disk contact or no media damage. For realizing those, we must consider many design parameters in L/UL systems. In this paper, we focus on the effect of the ramp profile. We can find out the lateral velocities in L/UL process through experiments and simulations for force of voice coil motor and friction force on ramp. And then, we will gain the optimal design of ramp slope to maintain the minimum clearance of suspension dimple and slider with FE model. In special, after finding the point at which air bearing breaks and designing the ramp, we will identify the results for improving unload performance.