• Korean Journal of Bronchoesophagology
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• 제19권1호
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• pp.5-10
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• 2013

Bilateral vocal cord palsy (BVCP) present a challenging condition which result from various etiologies including iatrogenic recurrent laryngeal nerve injury, progressive neurological disorder, intubation, trauma, tumor and idiopathic cause. Careful history taking, laryngoscopic evaluation, laryngeal EMG, and imaging studies are helpful for providing a precise diagnosis and planning appropriate treatment. BVCP causes airway restriction and not vocal dysfunction. In patients with BVFP, treatment is directed at maximizing the airway, while attempting to limit the negative effects of treatment on vocal function. A variety of surgical procedures are available for mangement of BVCP. The most conservative, limited procedure should be selected initially, and then further surgery and more extensive surgery can be tailored to the patient's airway and voice needs. This review will address the etiology, diagnosis, and managements of BVCP.

• Annals of Clinical Neurophysiology
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• 제9권1호
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• pp.19-22
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• 2007

Critical illness polyneuropathy (CIP) and critical illness myopathy (CIM) occur commonly in the patients who have been on mechanical ventilation for more than 1 week. Even in some patients diagnosed with CIP, an underlying myopathy may be the primary cause of the muscle weakness. The cormorbid status of CIP and CIM is called as critical illness polyneuropathy and critical illness myopathy (CIPNM). We describe a 56-year-old man with acute quadriparesis and areflexia after systemic inflammatory response syndrome. The diagnosis of CIPNM is important to avoid unnecessary investigations and unreasonably pessimistic prognosis. Electrophysiologic studies are essential for the diagnosis and for planning further clinical management.

• Korean Journal of Occupational Health Nursing
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• 제13권1호
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• pp.48-58
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• 2004

Purpose: To identify the factors which are related to compensated low back pain disability. These include individual. workplace. economic and injury factors. Method: Data collection was performed at 13 office of Korea Labor Welfare Corporation and 29 hospitals from 23th June to 4th August 2003. This study used 212 workers with compensated low back pain. Result: From the bivariate analysis, industry kind, type of employment, rest schedule, Job control, compensation, payment of company, diagnosis, cause of occupational injury, duration of compensated low back pain, pattern of pain, operation, other injury is related to low back pain disability. From the multiple regression analysis, rest schedule, compensation, diagnosis, pattern of pain, other injury have statistically significant effect on the low back pain disability. Conclusion: In order to reduce low back pain disability, occupational rehabilitation nursing intervention is necessary to workers with compensated low back pain.

• Journal of the Korean Institute of Intelligent Systems
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• 제13권5호
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• pp.600-605
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• 2003

PCA(Principle Component Analysis) has emerged as a useful tool for process monitoring and fault diagnosis. The general approach requires the user to identify the root cause by interpreting the residual or principle components. This could be tedious and often impossible for a large process. In this paper, PCA scheme is combined with the FCM-based fault diagnostic algorithm to enhance the diagnostic results. The implementation of the FCM-based fault diagnostic system by using PCA is done and its application is illustrated on the two-tank system.

• Korean Journal of Biological Psychiatry
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• 제13권1호
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• pp.3-10
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• 2006

Depression is the leading cause of disease-related disability among women. Postpartal depression (PPD) can produce substantial clinical, economic, and psychosocial impairment, not only for the women experiencing it but also for the women's children and family. Therefore, a comprehensive understanding the accurate detection and appropriate treatment of depression is mandatory in women of childbearing age. This review focused on the current knowledge of PPD.

• Journal of Advanced Marine Engineering and Technology
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• 제26권2호
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• pp.192-199
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• 2002

In continuous galvanizing process, the mass of zinc deposited and its distribution are controlled by the air pressure, effective distance from the air knife nozzle to the steel strip surface and line speed. Coating defects are resulted from the unbalance of these control factors and the inaccuracy of coating equipments. This paper investigates the main cause of coating deviation and a new air knife system for control of coating thickness was developed. We investigate dynamic pressure variation by air knife types. It is found that the coating deviation is caused by the unbalance of dynamic pressure, the irregularity of strip position, and the strip vibration. Formulating a useful coating model by using present working condition, an optimal working condition is suggested. The productivity and coating quality are improved by applying the result of this research at the shop floor.

• Journal of international Conference on Electrical Machines and Systems
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• 제2권3호
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• pp.336-341
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• 2013

Power converter plays a very important role in switched reluctance motor (SRM) systems, and it is also the easiest one to experience failures. Power converter faults will cause the motor to run in non equilibrium states, and a long time fault operation will lead to motor and other modules damaged, and make the system completely lose working stability. This paper uses an asymmetric bridge converter as the research object with three-phase SRM, employs the wavelet packet decomposition for the phase currents. It analyzes and studies the short circuit fault condition of IGBT, uses an energy discrete degree of the wavelet packet nodes as the fault characteristic, and conducts the corresponding experimental and simulation analysis to verify the effectiveness and practicality of the proposed method.

• Journal of Korean Foot and Ankle Society
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• 제16권1호
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• pp.19-25
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• 2012

The ankle impingement syndrome is an established cause of ankle dysfunction. In most cases with suspected ankle impingement, the diagnosis can be possible on the basis of mechanism of injury involved and the clinical examination. An appropriate imaging study should be selected where clinical doubt about the exact diagnosis exists. Radiography plays an important role in the initial assessment of these conditions, especially in anterior and posterior impingement. Magnetic resonance arthrography seems to be the most accurate means of assessing the capsular abnormalities present in anterolateral and anteromedial impingement and for confirmation of possible concomitant injury. Surgical treatment can be considered for the patients who did not respond to conservative treatment for more than 6 months, and has a low complication rate and a high level of success.

• The Transactions of the Korean Institute of Electrical Engineers
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• 제45권2호
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• pp.294-300
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• 1996

In hydro-generator, a groundwall insulation of stator windings gradually deteriorates due to mechanical, thermal, electrical and environmental stresses. These stresses combine to result in loose windings, delamination of the stator insulation and/or electrical tracking of the endwinding, all of which can lead to stator insulation failures. Conventionally, off-line tests such as partial discharge measurement, DC/AC current and .DELTA.tan.delta. tests has been used for estimation of winding condition. However, off-line test requires large power supply and generator outage. In addition, major cause of insulation problems such as loose wedges and slot dischages may not be found with off-line diagnoses. This paper introduces the on-line partial discharge measurement techniques using frequency spectrum analyzer(FSA) for the generator stator windings. The experimental results from the UIAM #1 hydro-generator confirms a optimistic application of on-line generator diagnosis method as a reliable tool for evaluation of winding condition.

• Proceedings of the KIEE Conference
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• 대한전기학회 1993년도 하계학술대회 논문집 A
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• pp.430-432
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• 1993

In this paper, an algorithm for the fault diagnosis using simple FCM(Fuzzy Cognitive Map) is proposed FCMs which store uncertain causal knowledges are fuzzy signed graphs with feedback. The algorithm allows searching the origin of fault and the ways of propagating the abnormality throughout the process simply and has following characteristics. First, it can distinguish the cause of soft failure which can degenerate the process as well as hard failure. Second, it is proper for the processes which have difficulties to establish the exact quantative model. Finally, it has short amputation time in comparison with the fault tree or the other AI methods. The applicability of the proposed algorithm for the fault diagonosis to a tank or pipeline system is demonstrated