• Proceedings of the Korean Institute of IIIuminating and Electrical Installation Engineers Conference
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• 2005.11a
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• pp.281-284
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• 2005

This paper deals with the parametric analysis of electric and magnetic fields generated by lightning discharges. The measuring system consisted of the plate-type electric field and loop-type magnetic field sensor, the voltage follower, the active integrator and LabVIEW software. The parameters of the electric and magnetic field waveforms produced by intracloud lightning strokes were presented.

• Proceedings of the Korean Institute of Electrical and Electronic Material Engineers Conference
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• 2001.11a
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• pp.621-624
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• 2001

A metal sheath provides a cable with electrostatic screening and a degree of magnetic screening. The presence of a screen on a cable also reduces the induction arising from the high-frequency components of transients caused by power-line switching and also induced transients from lightning strokes; such transient induced voltages are of increasing importance with the increasing use of miniaturized telecommunication equipment with very small thermal capacity. This paper describes electrostatic induction and electromagnetic induction caused by power interference. Also screening factors are proposed.

• Journal of Yeungnam Medical Science
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• v.36 no.3
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• pp.273-280
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• 2019

Cerebral venous sinus thrombosis (CVT) is a rare cerebrovascular condition accounting for 0.5-1% of all types of strokes in the general population. Hyperthyroidism is associated with procoagulant and antifibrinolytic activity, thereby precipitating a hypercoagulable state that predisposes to CVT. We report the case of a 31-year-old Korean man with massive CVT and diagnosis of concomitant Graves' disease at admission. Early diagnosis and prompt treatment of CVT are important to improve prognosis; therefore, CVT should be considered in the differential diagnosis in all patients with hyperthyroidism presenting with neurological symptoms.

• Journal of Korean Clinical Nursing Research
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• v.22 no.2
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• pp.194-204
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• 2016

Purpose: The purpose of this study was to identify physiological functional status and unmet care needs among patients with chronic pulmonary disease, colorectal cancer, and strokes after discharge. Methods: A crosssectional study was conducted with 224 patients diagnosed with aforementioned diseases from January to July in 2014 in two different tertiary hospitals in Seoul and its suburban area. Physiological functional status and unmet care needs were collected using Karnofsky Performance Status (KPS) Scale and Problems After Discharge Questionnaire-English version(PADQ-E) respectively. Data were analyzed using SPSS/WIN 21.0 program. Results: Patients with chronic pulmonary disease and colorectal cancer showed a low level of physiological functional status (mean: 77.20 and 77.60 out of 100 respectively) and a high level of unmet care needs (mean 2.23 and 2.63 out of 4 respectively). Stroke patients showed a high level of unmet care needs in the category of 'counseling', 'physical complaints', and 'instructions'. Physiological functional status was significantly associated with unmet care needs in all three patient groups and it showed a significant effect on unmet care needs in patients with stroke. Conclusion: The results showed that patients after discharge were still having insufficient functional status and various unmet care needs. The results of this study suggest a development of nursing care service for patients with chronic diseases after discharge.

• Korean Journal of Applied Biomechanics
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• v.12 no.1
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• pp.205-219
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• 2002

This research seeks to identify the plantar pressure distribution graph and change in force in connection with effective golf drive strokes and thus to help ordinary golfers have appropriate understanding on the moving of the center of weight and learn desirable drive swing movements. To this end, we conducted surveys on five excellent golfers to analyze the plantar pressure applied when performing golf drive strokes, and suggested dynamic variables quantitatively. 1) Our research presents the desire movements as follows. For the time change in connection with the whole movement, as a golfer raises the club head horizontally low above ground from the address to the top swing, he makes a semicircle using the left elbow joint and shaft and slowly turns his body, thus lengthening the time. And, as the golfer twists the right waist from the middle swing to the impact with the head taking address movement, and does a quick movement, thus shortening the time. 2) For the change in pressure distribution by phase, to strike a strong shot with his weight imposed from the middle swing to the impact, a golfer uses centrifugal force, fixes his left foot, and makes impact. This showed greater pressure distribution on the left sole than on the right sole. 3) For the force distribution graph by phase, the force in the sole from the address to halfway swing movements is distributed to the left foot with 46% and to the right foot with 54%. And, with the starting of down swing, as the weight shifts to the left foot, the force is distributed to the left sole with 58%. Thus, during the impact and follow through movements, it is desirable for a golfer to allow his left foot to take the weight with the right foot balancing the body. 4) The maximum pressure distribution and average of the maximum force in connection with the whole movement changed as the left (foot) and right (foot) supported opposing force, and the maximum pressure distribution also showed much greater on the left sole.

• Journal of the Korea Computer Graphics Society
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• v.17 no.4
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• pp.11-21
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• 2011

This paper proposes a method for decomposing a Hangul glyph of outline fonts into its initial, medial and final components using statistical-structural information. In a font family, the positions of components are statistically consistent and the stroke relationships of a Hangul character reflect its structure. First, we create the component histograms that accumulate the shapes and positions of the same components. Second, we make pixel clusters from character image based on pixel direction probabilities and extract the candidate strokes using position, direction, size of clusters and adjacencies between clusters. Finally, we find the best structural match between candidate strokes and predefined character model by relaxation labeling. The proposed method in this paper can be used for a study on formative characteristics of Hangul font, and for a font classification/retrieval system.

• Fire Science and Engineering
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• v.25 no.1
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• pp.50-56
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• 2011

In recently years, occurrences of lightning return strokes have been increased by global worming effect and intensity of lightning impulse voltage and current accompanied by lightning discharges has being strengthening. In Korea, 560 thousand lightning discharges happened in 200S. According to the increasing frequencies of lightning, human deaths and damages to the structure have been increased steadily. Electric fire caused by lightning return strokes due to the breakdown between power line and ground line from the ground potential rise on a process of the lightning impulse current through to the ground. The damages of lightning were occurring at same time in the neighboring areas of the lightning point. In order to protect from the lightning stroke, we made a suggestion to use protection devices and equipotential bonding at the dangerous areas. The analysis results of electric fires caused by lightning would be utilized to investigate and to find accurate fire cause in the fire scenes.

• The Journal of Korean Medicine
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• v.21 no.3
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• pp.129-139
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• 2000

Clinical observation was made on 210 cases of CVA that were confirmed through brain CT, MRI scan and clinical observation. They were hospitalized in the oriental medical hospital of Kyungwon University from January to December in 1998. Objective : To evaluate the current status of cerebrovascular disease in Korea, we performed observation on stroke patients. Methods : We performed a retrospective study on 210 cases of stroke who had been admitted to the Dept. of Internal Medicine, College of Oriental Medicine, Kyungwon University from Jan. 1, 1998 to Dec. 31, 1998. Results : The incidence was highest in the patients with the age of above fifty. The frequency of strokes was similar between male and female cases. Ischemic stroke(70.0%) was more common than hemorrhagic stroke(20.5%), with transient ischemic attacks(9.5%) occuring less frequently. Middle cerebra! arterial territory was the most commonly involved site in ischemic strokes. Among intracerebral hemorrhages, putaminal hemorrhages were found in 69.8%, and was followed by IVH(9.3%), IVH with ICH(7.0%), subcortical hemorrhages (4.7%) and pontine hemorrhages(4.7%). The most ordinary preceding disease was hypertension. The next was diabetes mellitus. Most cases were given simultaneous treatment in both western and oriental medical methods. Conclusions : Generally it is thought that CVA occurs frequently in winter. But our observations reveal no such relationship. The predisposing factors of cerebral infarction were usually initiated during the time of resting and sleeping and those of cerebral hemorrhage chiefly during the time of exercising. I Patients whose condition of consciousness was bad at the time of admission tended to have a bad prognosis. This study suggests changing trends of stroke in Korea, and that a multicenter prospective study using stroke registry is required for confirmation.

• Journal of Advanced Navigation Technology
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• v.17 no.1
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• pp.115-122
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• 2013

Disease diagnostics based on medical imaging is getting popularity day by day. Presence of the atherosclerosis is one of the causes of narrowing of carotid arteries which may block partially or fully blood flow into the brain. Serious brain strokes may occur due to such types of blockages in blood flow. Early detection of the plaque and taking precautionary steps in this regard may prevent from such type of serious strokes. In this paper, we present an automatic image segmentation technique for carotid artery ultrasound images based on active contour approach. In our experimental study, we assume that ultrasound images are properly aligned before applying automatic image segmentation. We have successfully applied the automatic segmentation of carotid artery ultrasound images using snake based model. Qualitative comparison of the proposed approach has been made with the manual initialization of snakes for carotid artery image segmentation. Our proposed approach successfully segments the carotid artery images in an automated way to help radiologists to detect plaque easily. Obtained results show the effectiveness of the proposed approach.

• Journal of KIISE:Software and Applications
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• v.30 no.1_2
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• pp.93-102
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• 2003

A slant correction method for handwritten Korean strings based on analysis of stroke distribution, which effectively reflects structural properties of Korean characters, is presented in this paper. The method aims to deal with typical problems which have been frequently observed in slant correction of handwritten Korean strings with conventional approaches developed for English/European languages. Extracted strokes from a line of text image are classified into two clusters by applying the K-means clustering. Gaussian modeling is applied to each of the clusters and the slant angle is estimated from the model which represents the vertical strokes. Experimental results support the effectiveness of the proposed method. For the performance comparison 1,300 handwritten address string images were used, and the results show that the proposed method has more superior performance than other conventional approaches.