• 전자공학회논문지 IE
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• v.46 no.4
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• pp.66-72
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• 2009

In field of environments, the control and monitoring devices for sewage disposal facilities have been developed to overcome a problem of the water contamination according to industrialization and urbanization. In order to control and monitor the driving motor and the surroundings states of the sewage disposal facilities installed in local stations, this paper presents the design method of efficient module system interconnected by internal network with serial interface. It is expected that the proposed method in this paper is able to provide the more adaptive and flexible design technique for the specification of condition and factors needed in the fast-changed environment market.

• Herbal Formula Science
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• v.12 no.1
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• pp.29-77
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• 2004

After this study: I report the following result from it. 1. Beriberi is defined as sensory or motor disorder of leg with a painful-swelling and pyrexia. If it progress severely, the disease transmits to heart and cause numbness of the lower abdomen, vomiting, anorexia, palpitation, chest distress and confusion. 2. The external etiologic factors of Beriberi are wind-toxic pathogen, dampness, improper diet and climate sickness, the internal etiologic factors are deficiencies of the kidney, both Gi and blood and original vital energy. 3. The treatment of Beriberi is free-going of blockage, because it is a blocked disease. 4. Danggwiy-juntongtang and Ganghwar-dochetang is the most in the order of frequency of use. Mahwang-juagyongtang, Banha-juagyongtang, Daehwang-juagyongtang, Shinbi-juagyongtang are used in sequence. 5. The prescriptions of Beriberi are made up of the herbs that clear heat, for example, Ganghwar, Changchul, Mahwang and Bangpung, and the herbs that reinforces Gi, for example, Insam and Bakchul.

• The Journal of Korean Medicine
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• v.22 no.3
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• pp.81-91
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• 2001

Objectives : This study was prepared for investigating the clinical features of stroke patients. Methods : We retrospectively reviewed the medical records of 177 patients who were admitted to the Dept. of Internal Medicine, College of Oriental Medicine, Kyungwon University with a diagnosis of stroke from Jan. I, 1999 to Dec. 31, 1999. Results : Ischemic stroke (74.0%) was more common than hemorrhagic stroke (19.8%). The proportion of males was 53.7%, of females was 46.3%, and the most prevalent age group is those in their sixties. Cerebral infarction was most frequently noticed in MCA territory, hemorrhage in putamen. Hypertension was the most common preceding disease, followed by diabetes mellitus. The rate of recurrence was high in cerebral infarction. The onset mode of cerebral infarction was sleeping and rising and of cerebral hemorrhage was acting. Most patients visited the hospital within 24 hours. The most common symptoms at admission were motor weakness and speech disorder. The most common complication was urinary tract infection. Admission period was 29.5 days. Physical treatment from onset in cerebral infarction and in cerebral hemorrhage was 17.4 and 22.0 days, respectively. Conclusions : Our study of CVA patients was similar to previous studies from 1994 to 1998. In most cases, western and oriental treatment and medicine were given synthetically. Prescription of sasang constitutional medicine had wide application.

• Journal of Drive and Control
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• v.13 no.3
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• pp.15-23
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• 2016

The direct-drive servo valve(DDV) is a kind of one-stage valve because the main spool valve is directly driven by the dc motor. Since the DDV structure is simple, it is less expensive, more reliable, and offers a reduced internal leakage and a reduced sensitivity to fluid contamination. The control system of the DDV is highly nonlinear due to a current limiter, a voltage limiter, and the flow-force effect on the spool motion. The shape of the step response of the DDV-control system varies considerably according to the magnitudes of the step input and the load pressure. The system-design requirements mean that the overshoots should be less than 20%, and the errors at 0.02s should be less than 2%, regardless of the reference-step input sizes of 1V and 5V and the load-pressure magnitudes of 0MPa and 20.7MPa. To satisfy the system-design requirements, the PID-controller parameters of $K_c$, $T_i$ and $T_d$, and the derivative-feedback gain of $K_{der}$ are designed using the root locus and manual tuning.

• Journal of Korean Neurosurgical Society
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• v.59 no.4
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• pp.400-404
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• 2016

We report a case of acute ischemic stroke involving both the anterior and posterior circulation associated with a persistent primitive trigeminal artery (PPTA), treated by endovascular revascularization for acute basilar artery (BA) occlusion via the PPTA. An otherwise healthy 67-year-old man experienced sudden loss of consciousness and quadriplegia. Magnetic resonance imaging showed an extensive acute infarction in the right cerebral hemisphere, and magnetic resonance angiography showed occlusion of the right middle cerebral artery (MCA) and BA. Because the volume of infarction in the territory of the right MCA was extensive, we judged the use of intravenous tissue plasminogen activator to be contraindicated. Cerebral angiography revealed hypoplasia of both vertebral arteries and the presence of a PPTA from the right internal carotid artery. A microcatheter was introduced into the BA via the PPTA and revascularization was successfully performed using a Merci Retriever with adjuvant low-dose intraarterial urokinase. After treatment, his consciousness level and right motor weakness improved. Although persistent carotid-vertebrobasilar anastomoses such as a PPTA are relatively rare vascular anomalies, if the persistent primitive artery is present, it can be an access route for mechanical thrombectomy for acute ischemic stroke.

• Journal of Practical Engineering Education
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• v.6 no.1
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• pp.9-14
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• 2014

The purpose of this research is to introduce a case study on application of practical engineering. Topic of the study is a medicine vending machine which consists of PLC (Programmable Logic Controller), DC motor, switch, photo sensor and so on. In order to design and manufacture of the device, a lot of subjects which have learned during school year are reviewed and practiced. Especially, not only internal process but mechanical mechanism can be understood by organizing hardware and software of all parts. Also, several ideas like user made supply or exact counting are suggested for high performance. From this case study, students can increase their originality and adaptability for related industry. Also, the technique can be initiated industry if needed.

• Journal of the Korean Society for Precision Engineering
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• v.25 no.12
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• pp.89-99
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• 2008

In this paper, the position tracking control problem of the servo system with nonlinear dynamic friction is issued. The nonlinear dynamic friction contains a directly immeasurable friction state variable and the uncertainty caused by incomplete parameter modeling and its variations. In order to provide the efficient solution to these control problems, we propose the composite control scheme, which consists of the robust friction state observer, the FNN approximator and the approximation error estimator with sliding mode control. In first, the sliding mode controller and the robust friction state observer is designed to estimate the unknown internal state of the LuGre friction model. Next, the FNN estimator is adopted to approximate the unknown lumped friction uncertainty. Finally, the adaptive approximation error estimator is designed to compensate the approximation error of the FNN estimator. Some simulations and experiments on the servo system assembled with ball-screw and DC servo motor are presented. Results show the remarkable performance of the proposed control scheme. The robust friction state observer can successfully identify immeasurable friction state and the FNN estimator and adaptive approximation error estimator give the robustness to the proposed control scheme against the uncertainty of the friction parameters.

• International Journal of Precision Engineering and Manufacturing
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• v.6 no.2
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• pp.19-25
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• 2005

In this paper, the feedforward control with least mean square (LMS) adaptive algorithm is proposed and examined to reduce rotating error by runout of an active magnetic bearing system. Using eddy-current type gap sensors for control, the electrical runout caused by non-uniform material properties of sensor target produces rotational error amplified in feedback control loop, so this runout should be eliminated to increase rotating accuracy. The adaptive feedforward controller is designed and examined its tracking performances and stability numerically with established frequency response function. The designed feedforward controller was applied to a grinding spindle system which is manufactured with a 5.5 kW internal motor and 5-axis active magnetic bearing system including 5 eddy current gap sensors which have approximately 15∼30㎛ of electrical runout. According to the experimental results, the error signal in radial bearings is reduced to less than 5 ,Urn when it is rotating up to 50,000 rpm due to applying the feedforward control for first order harmonic frequency, and corresponding vibration of the spindle is also removed.

• Physical Therapy Korea
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• v.17 no.3
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• pp.48-58
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• 2010

The aim of this study was performed to determine the inter-rater reliability of the Stroke Rehabilitation Assessment of Movement (STREAM) translated in Korean. This was a new clinical measurement tool for evaluating the recovery of voluntary movement and basic mobility following stroke. A direct-observation reliability study was conducted on 20 patients who had strokes and were in a rehabilitation setting. Subjects were assessed by two physical therapists. The reliability of the STREAM scores was demonstrated by weighted kappa statistics for inter-rater agreement on scores for individual items ranged from .83 to 1.0, intraclass correlation coefficients for total score was .99, and for subscale scores was ranged from .96 to .99. The internal consistency of the STREAM scores was demonstrated by Cronbach alphas of greater than .99 on the subscales and overall. These high levels of reliability support the use of the STREAM translated in Korean instrument for the measurement of motor recovery following stroke.

• Journal of electromagnetic engineering and science
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• v.11 no.4
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• pp.298-303
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• 2011

A capsular endoscope (CE) for inspection of the large intestine requires a motor for backward navigation against the autonomous travel in the intestine. This study proposes an HF power system for generating a magnetic field and for delivering wireless power to the internal or implanted medical devices. The magnetic field is generated by a wound coil (L) around a wooden frame, and the current is driven to the coil through a resonating capacitor (C). The characteristics of the resonance frequency shifting of the L-C series circuit are analyzed. A stable magnetic field intensity in the field coil is maintained by a specially designed frequency tracking system that automatically follows the L-C resonance frequency. Testing confirmed that the oscillation system tracks well the parameter changes of the electric components caused by the operating conditions or environmental variations.