• Clinical and Experimental Reproductive Medicine
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• v.13 no.2
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• pp.137-144
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• 1986

A reveiw of 85 patients with uterine anomalies was made in respect to the incidence, chief complaints, the reason of infertility, fetal wastage rate, pregnancy complications, fetal presentations and obstetric outcome after metroplasty from 1980 to 1985. The results were summarized as follows: 1. Incidence of uterine anomaly was 0.18% among all outpatients (85/48,240). 2. Of the 85 patients, there were 36 with bicornuate deformities (42.3%), 21 septate (24.7%), 18 uterus didelphys (21.2%), 8 arcuate (9.4%) and 2 patients with unicornuate anomalies (2.4%). 3. Uterine anomalies were diagnosed by hysterosalpingogram (54.1%), pelvic examination (14.2%) and other operative procedures. 4. Chief complaints were primary infertility (41.2%), secondary infertility (15.3%), repeated pregnancy loss (12.9%), antenatal care (11.8%) and menstural disturbance (10.6%), etc. 5. Twenty-nine patients with uterine anomalies had primary infertility. The cause of infertility was proved nonuterine in 26 cases and remained unknown in 3 cases. 6. The obstetric outcome of 104 pregnancies was spontaneous abortion in 51.0%, premature delivery in 11.50/0 and fetal loss in 57.7%. 7. Complications of 41 present pregnancies were threatened abortion (22%), premature rupture of membrane (12%) and premature labor (10%), etc. The frequency of abnormal presentation was 35.3% and 64.7% of deliveries was made by Cesarian section. 8. Metroplasty was performed in 13 patients who didn't have a baby because of repeated miscarriage and unknown cause of infertility. Subsequently 8 patients had 9 successful pregnancies: 6 patients had 7 healthy babies and 2 patients are now in pregnancy without any complications.

• Journal of Power System Engineering
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• v.21 no.1
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• pp.30-36
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• 2017

In robot industries, the request to obtain a high efficiency and accurately controlled electric actuator has been growing. Nevertheless, the effectiveness of electric actuators is significantly affected by the presence of factors such as nonlinearity, uncertain disturbance and unknown dynamics. Therefore, it makes difficult to derive an exact mathematical model of the controlled system. In this paper, a new method for easily recognizing and regenerating robot motions used in small size industries such as painting and welding parts is proposed. Instead of modeling the entire dynamic motion of the robot system, this method is based on the procedure of modeling and controller design for every arm individually. The proposed method does not require complex model and control system such that it gives easy working process to the small size industries. Based on this fact, in this research, the model and PID controller for every arm of the 3 DOF robot system are obtained separately. Some experimental results are implemented to validate the effectiveness of the proposed method.

• Journal of Electrical Engineering and Technology
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• v.12 no.2
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• pp.559-568
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• 2017

Harmonic/inter-harmonic detection and analysis is an important issue in power system signal processing. This paper proposes a fast algorithm based on matching pursuit (MP) sparse signal decomposition, which can be employed to extract the harmonic or inter-harmonic components of a distorted electric voltage/current signal. In the MP iterations, the method extracts harmonic/inter-harmonic components in order according to the spectrum peak. The Fast Fourier Transform (FFT) and nonlinear optimization techniques are used in the decomposition to realize fast and accurate estimation of the parameters. First, the frequency estimation value corresponding to the maxim spectrum peak in the present residual is obtained, and the phase corresponding to this frequency is searched in discrete sinusoids dictionary. Then the frequency and phase estimations are taken as initial values of the unknown parameters for Nelder-Mead to acquire the optimized parameters. Finally, the duration time of the disturbance is determined by comparing the inner products, and the amplitude is achieved according to the matching expression of the harmonic or inter-harmonic. Simulations and actual signal tests are performed to illustrate the effectiveness and feasibility of the proposed method.

• Journal of the Institute of Electronics Engineers of Korea SC
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• v.42 no.5 s.305
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• pp.13-18
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• 2005

Over the last few years, the control of bipedal robot has been considered a promising but difficult research field in the community of robotics. In this paper, a new robust output control method for a bipedal robot is proposed using the adaptive fuzzy logic. The adaptive fuzzy logic is used as an system approximator to cancel the unknown uncertainty. First, a model for a bipedal robot including switching leg influence, uncertainty and disturbance is presented. Second, a controller is designed in which the joint velocity measurement is not required. Fuzzy approximation error estimator is inserted in the system for tuning the fuzzy logic. Finally, the result of the computer simulation is presented to show the validity of the suggested control method.

• The Korean Journal of Pain
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• v.10 no.1
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• pp.113-116
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• 1997

Sensorineural hearing loss(SNHL) is defined as a sudden hearing impairment which was develope over a period of hours to days. The definitive cause of SNHL is unknown in most cases. Disturbance of the blood flow of the inner ear is a main causal hypotheses. Most symptomatic treatment is focusing to improving the blood flow of the inner ear. At our hospital, most patients are recommended to bed rest, vasodilators(nicotinic acid, antihistamines) and stellate ganglion block(SGB) for two weeks. We experienced two cases of recurrence immediately after recovery from SNHL. They discontinued SGB after initial recovery. due to associated pain with operation and or psychologic stress. One patient resumed SGB and medication treatment, but the second who gave up treatment was not recovered. Therefore, we recommend to continuance of treatment of stellate ganglion blocks to improve recovery rate of SNHL and avoid further trauma and psychologic stress during the recovery period of SNHL.

• Proceedings of the KIEE Conference
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• 2008.10b
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• pp.464-465
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• 2008

This paper proposed a robust controller in order to handle the boom vibration of inspection robot. While a inspection robot moves on boom with vibration by weight occurs. Therefore, Boom as structure like cantilever beam appears vibration by weight of inspection robot. The Z axis of inspection robot operates with Sliding structure. inspection robot is used "Fuzzy Controller" for position control with Z axis. The developed robot system is composed of the specially designed car for inspection robot. The proposed Fuzzy Controllers are used to track position reference signal of Z axis. A Experiment verify that the proposed Fuzzy Controller design method can achieve favorable control performance with regard to external disturbance.

• Journal of Korean Neurosurgical Society
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• v.56 no.5
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• pp.436-440
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• 2014

Sarcoidosis is a systemic disease of unknown etiology that may affect any organ in the body. The nervous system is involved in 5-16% of cases of sarcoidosis. Here, we report a case of intramedullary sarcoidosis presenting with delayed spinal cord swelling after laminoplasty for the treatment of compressive cervical myelopathy. A 56-year-old woman was admitted to our hospital complaining of upper extremity pain and gait disturbance. The patient had undergone laminoplasty for compressive cervical myelopathy 3 months previously. Follow-up magnetic resonance imaging revealed a large solitary intramedullary lesion with associated extensive cord swelling, signal changes, and heterogeneous enhancement of spinal cord from C2 to C7. Spinal cord biopsy revealed non-necrotizing granulomas with signs of chronic inflammation. The final diagnosis of sarcoidosis was based upon laboratory data, imaging findings, histological findings, and the exclusion of other diagnoses. Awareness of such presentations and a high degree of suspicion of sarcoidosis may help arrive at the correct diagnosis.

• Archives of Plastic Surgery
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• v.33 no.5
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• pp.648-651
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• 2006

Purpose: Tarsal tunnel syndrome is characterized by pain and paresthesia of the entire posterior tibial nerve and its branches of the lower extremity. The cause of the tarsal tunnel syndrome is usually unknown but, rare case of space occupying benign tumors such as a ganglion may be one of the causes. We report our experiences of surgical treatment of the tarsal tunnel syndrome caused by ganglion we have encountered recently. Methods: A 54-year-old male patient presented with paresthesia, burning pain, positive Tinnel's sign without preceeding trauma, infection or any other causes of event. With surgical intervention, we completely removed the space occupying ganglion and with performed surgical release of the posterior tibial nerve and its branches. Results: At a 14-month follow up examination, the symptoms of paresthesia, burning pain, sensory disturbance was much improved compared to the preoperative conditions. Takakura's rating scale was elevated from 4(Poor) to 8(Good). Conclusion: We report our surgical experience of a rare case of tarsal tunnel syndrome caused by a ganglion, with a review of literature.

• Annals of Clinical Neurophysiology
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• v.3 no.1
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• pp.37-39
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• 2001

Although the etiology and pathogenesis of amyotrophic lateral sclerosis(ALS) is unknown, increasing evidence supports a role for autoimmune mechanisms in motor neuron degeneration. The coexistence of immune disease in ALS supports that an altered immune system may contribute to disease pathogenesis. A 55-year-old woman was admitted to our department due to dysarthria and gait disturbance. On physical and neurologic examination, she showed thyroid enlargement, tongue atrophy, muscle weakness, fasciculation, and increased deep tendon reflex. The electrophysiological studies are compatible with motor neuron disease. Cytological findings of thyroid were compatible with Hashimoto's thyroiditis. Thus, we report a case of ALS combined with Hashimoto's thyroiditis. And the simultaneous presentation with ALS and Hashimoto's thyroiditis led us to consider whether this was simply a chance association or not.

• 제어로봇시스템학회:학술대회논문집
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• 1993.10a
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• pp.1199-1205
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• 1993

It has been well known that the assumption of full state availability is one of the most important restrictions to the practical realization of VSCS. And several attempts to alleviate the assumption had been made. However, it is not easy to find a positive scheme among them. Recently, an output feedback variable structure control system(OFVSCS) was proposed and the effectiveness of the scheme was validated for the disturbance free systems. The purpose of this study is to propose a robust OFVSCS that have the robust properties against process parameter variations and external distrubances by extending the basic OFVSCS and to evaluate its control performances through power system stabilizer design example. The ROFVSCS is composed of dynamic switching function and output feedback switching control inputs that are constructed by the use of the unknown vector modeling technique. With the proposed scheme, existence of sliding mode is guaranteed and any nonzero bias can be suppressed in the face of disturbances and process parameter variations as far as well-known matching condition is satisfied. Due to the fact that the ROFVSCS is driven by small number of measured informations, the practical application of VSCS for the systems with unmeasurable states and for high order systems that conventional schemes cannot be applied, is possible with the proposed scheme. It is noticeable that the implementation cost of VSCS can be considerably reduced without sacrifice of control performances by adopting ROFVSCS since there is no need measure the states with high measurement cost.