• 한국추진공학회:학술대회논문집
• /
• 한국추진공학회 2017년도 제48회 춘계학술대회논문집
• /
• pp.778-780
• /
• 2017

고체 로켓의 성능은 고체 로켓 모터의 내탄도 해석으로 계산한다. 본 논문에서는 HLLC Scheme을 사용한 내탄도 해석 코드를 개발하였다. 해석 코드를 적용한 결과 고체 로켓 모터의 성능을 잘 계산하였음을 확인하였다.

• 대한한방내과학회지
• /
• 제35권4호
• /
• pp.448-454
• /
• 2014

Objectives: The aim of this study was to analyze the change of lateral shift of Center of Pressure (CoP) according to the gait improvement in post-stroke hemiplegic patients and to investigate relationship between the change of motor grade and lateral shift of CoP. Methods: We measured the lateral shift of CoP and motor grade of eight post-stroke hemiplegic patients at the beginning of dependent gait and independent gait. Results: We found that CoP tended to be shifted to the non-affected side when patients started to walk independently. Furthermore, there was no relationship between the change of motor grade and lateral shift of CoP. Conclusions: This result may suggest it is more important to control the non-affected side than the affected side, at least until the beginning independent gait.

• 제어로봇시스템학회논문지
• /
• 제20권2호
• /
• pp.180-185
• /
• 2014

DC motor is a representative electric motor commonly utilized in various motion control fields. However, DC motor-based motion control systems suffer from degradation of position precision due to nonlinear static friction. In order to enhance control precision, friction model-based compensators have been introduced in previous researches, where friction models are identified and counter inputs are added to control inputs for cancelling out the identified friction forces. In this paper, a static friction compensator is proposed without use of a friction model. The proposed compensation algorithm utilizes internal state manipulation to generate compensation pulses, and related parameters are easily tuned experimentally. The proposed friction compensator is applied to a DC motor-based motion control system, and results are presented in comparison with those without a friction compensator.

• 대한한방내과학회지
• /
• 제22권3호
• /
• pp.397-403
• /
• 2001

Objectives; This study was carried out to investigate the motor activity, glucose transport and metabolism of Jiaweizhengqi-tang(JKT) in rat small intestine. Methods ; The motor activity of the rat small intestine has been investigated by means of measuring barium sulfate passage degrees. Transport and metabolism of glucose were studied in everted sac of rat small intestine with incubation under several conditions. Results; Atropine treatment significantly delayed barium sulfate transit, and JKT pretreatment increased intestinal motor activity, but not significant. JKT administration showed renal toxicity in animal experiment, so clinical safety should settled to use commonly. The transport and metabolism of glucose were greater at jejunum than ileum. So, everted jejunum of rat were used to study the effect of JKT. When JKT were treated, the concentration of glucose were higher than untreated group. This result was thought to be influenced by the glucose in JKT. When 2, 4 dinitrophenol was treated, the transport and metabolism of glucose were decreased, but JKT treated together, the concentration of glucose in serosal solution increased. Conclusions; The transport and metabolism of glucose were influenced by the glucose in JKT. And the effects of JKT were still unidentified, but through continuous investigation, these effects of JKT should be identified.

• 대한중풍순환신경학회지
• /
• 제14권1호
• /
• pp.15-22
• /
• 2013

■ Objectives The aim of this study is to look into the correlation between motor performance and displacement of center of pressure(CoP) in hemiplegic patients with cerebral stroke. ■ Methods We measured manual muscle test(MMT) as motor performance value and, anterior/posterior position(Ant./Post. position) and lateral symmetry of CoP as displacement of CoP values from 129 stroke patients. The gait analysis was carried out using treadmill gait analysis equipment. ■ Results In terms of motor performance, MMT of upper extremity negatively correlated with Ant/Post position of CoP, however, one of lower extremity did not. In addition, MMT of both extremities negatively correlated with lateral symmetry of CoP. ■ Conclusion Displacement of CoP was negatively correlated with hemiplegic patient's motor performance.

• 대한한방내과학회지
• /
• 제42권5호
• /
• pp.833-845
• /
• 2021

Parkinson's syndrome is a degenerative brain disease that presents characteristic motor symptoms of tremor, rigidity, and gait disturbance. In addition to these motor symptoms, Parkinson's syndrome also presents non-motor symptoms (NMSs) such as sleep disturbance and cognitive decline. NMSs reduce patient's quality of life and psychosocial functioning and cause economic burden on the patient, so appropriate evaluation and treatment are required. Lewy body dementia is one of the several diseases belonging to Parkinson's syndrome. Its symptoms such as cognitive function, memory impairment, and hallucinations occur with Parkinsonism. Although drug therapy is being used with drug treatment to treat non-motor symptoms, it has limitations such as side effects, which stimulated interest in other complementary treatment methods such as oriental medicine treatment, dance, and yoga. The patient in this case complained of tremor in the right upper extremity, muscle hypertension and pain, and persistent vision, memory, and cognitive decline. The patient was diagnosed with probable Lewy body dementia. The patient was hospitalized for 4 months and received acupuncture and herbal medicines. After treatment, the patient's NMS scale scores decreased from 90 to 63, and the Unified Parkinson's Disease Rating Scale scores (summed I, II, and III) decreased from 17 points to 8 points. The Beck Depression Inventory score decreased from 22 points to 13 points. In addition, the patient's subjective evaluation revealed improvement. In this case, a patient diagnosed with probable Lewy body dementia who did not respond to the standard treatment and did not want to take medications showed improvement in not only motor symptoms but also NMSs after integrative Korean medicine treatment.

• 대한전기학회논문지:전기기기및에너지변환시스템부문B
• /
• 제49권6호
• /
• pp.450-456
• /
• 2000

In this paper, we proposed a novel control method which uses the internal impedance angles as a control parameter to drive traveling wave type ultrasonic motor. An impedance characteristic of the ultrasonic motor is obtained by analysis of the equivalent circuits including the external inductor used to generate the coupled resonance. The phase angle of internal impedance to achieve optimal control performance is derived. For the tracking of impedance angle, an information of phase difference is obtained from the applied voltage and current. The high speed phase difference detector is designed to monitor the phases of ultrasonic motor. The effectiveness of the proposed control scheme is clarified by experiments.

• Journal of Magnetics
• /
• 제21권2호
• /
• pp.249-254
• /
• 2016

Recently, electric vehicles have got significant attention because it is more eco-friendly and efficient than internal combustion engine vehicles. Instead of an internal combustion engine, the electric vehicle has a motor for propulsion. The permanent magnet synchronous motor which has permanent magnet instead of field winding in the rotor has especially higher efficiency and power density than other types of motor. When the irreversible demagnetization is occurred, drivers are exposed to high risk of accident by the fault operation of motor. Therefore, the irreversible demagnetization of permanent magnet should be detected to reduce the risk of accident. In this study, the demagnetization diagnosis method based on the result of locked rotor test is proposed. Based on short measurement time, the proposed diagnosis method aims to detect the demagnetization fault when an electric vehicle is at a complete standstill. The proposed method is verified through the finite element analysis.

• 동의생리병리학회지
• /
• 제26권5호
• /
• pp.765-772
• /
• 2012

In this study, a patient with both motor and vocal tic disorders of onset at age 34 was treated for a total of 316 days. The characteristics of the tic symptoms of the patient were examined and treated two to three times a week with herbal medicine, acupuncture, cupping, and habit reversal treatment along with western medication prescribed to the patient from a psychiatric clinic. Furthermore, the condition of the patient was evaluated once a week by the Yale Global Tic Severity Scale(YGTSS-K). Both motor and vocal tic symptoms deceased to a great amount after treatment and the patient was able to lower the dosage of western medication with the approval of her psychiatric doctor. This case suggests that Oriental medical treatment undergone with habit reversal treatment could improve tic disorders better than sole western medication treatment.

• 대한한방내과학회지
• /
• 제37권6호
• /
• pp.990-997
• /
• 2016

Objectives: This study observed changes in gait pattern according to the motor grade of the paretic lower limb in patients with basal ganglia stroke who are in the subacute phase. Methods: We used the Manual Muscle Test (MMT) to evaluate the motor grade of the paretic lower limb of 21 patients with subacute basal ganglia stroke and then divided them into two groups based on the MMT results. Stroke patients with a motor grade above Gr. III were put in group I (15 people) and those with a grade less than Gr. III in group II (6 people). We also estimated spatiotemporal factors using treadmill gait analysis equipment. The values were gait velocity, step length, step time, double support phase, and cadence. The first measure was conducted during the early period of admission and the second was between four and five weeks after admission. Results: In Group I, the gait velocity and step length of both legs significantly increased. In Group II, the step length and step time of the paretic side and the gait velocity tended to decrease, but not significantly. The step length of the paretic side in Group II was significantly longer than that in Group I at the first measure. The step time of the paretic side in Group I was significantly shorter than that in Group II and gait velocity and cadence in Group I were significantly higher than in Group II at the second measure. Conclusions: The gait parameters of all stroke patients improved in terms of time. In addition, the changes in gait pattern were different depending on the motor grade of the paretic lower limb.