• Journal of the Institute of Convergence Signal Processing
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• v.5 no.3
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• pp.190-197
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• 2004

This paper presents automated prediction of transient ischemic episodes using neural networks(NN) based pattern matching method. The learning algorithm used to train the multilayer networks is a modified backpropagation algorithm. The algorithm updates parameters of nonlinear function in a neuron as well as connecting weights between neurons to improve learning speed. The performance of the method was evaluated using ECG signals of the MIT/BIH long-term database. Experimental results for 15 records(237 ischemic episodes) show that the average sensitivity and specificity of ischemic episode prediction are 85.71% and 71.11%, respectively. It is also found that the proposed method predicts an average of 45.53［sec］ ahead real ischemia. These results indicate that the NN approach as the pattern matching classifier can be a useful tool for the prediction of transient ischemic episodes.

• Journal of Environmental Science International
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• v.21 no.7
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• pp.815-824
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• 2012

The purpose of this study was to analyze the meteorological characteristics of wintertime high PM10 concentration episodes in Busan. $PM_{10}$ concentration has been reduced for the past four years and recorded near or exceeded 100 ${\mu}g/m^3$ (national standard of $PM_{10}$). High concentration episodes in Busan were 6 case, $PM_{2.5}/PM_{10}$ ratio was 0.36~0.39(mean 0.55). High $PM_{10}$ concentration occurred during higher air temperature, more solar radiation and sunshine, lower relative humidity, and smaller cloud amount. Synoptically, it also occurred when Busan was in the center or the edge of anticyclone and when sea breeze intruded. An analysis of upper air sounding showed that high $PM_{10}$ concentration occurred when surface inversion layer and upper subsidence inversion layer existed, and when boundary layer depth and vertical mixing coefficient were low. An analysis of backward trajectory of air mass showed that high $PM_{10}$ concentration was largely affected by long range transport considering that it occurs when air mass is intruded from China.

• Journal of Korean Academy of Fundamentals of Nursing
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• v.14 no.4
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• pp.446-456
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• 2007

Purpose: The purpose of study was to identify violence episodes by patients and/or their guardians and responses from emergency room nurses. Method: A convenient sample of 172 emergency nurses was selected from general hospitals with more than 200 beds. A survey design was used and data were collected from October 2 to October 11, 2006. using self-report questionnaires which were developed by the authors. Descriptive statistics, with the SPSS PC program were used to analyze the data. Results: The majority of nurses(97.1%) had experienced violence by patients or their guardians in the previous month. Violence offenders who were drunk comprised 68.6% of total offenders. Causes of violence were delays in examination and treatment(59.9%). The major coping behavior in dealing with violence episodes was ignoring(40.1%). Responses to violence experienced by emergency nurses were rated as 2.39. Response to violence according to general characteristics of the nurses showed no statistically significant differences. Conclusion: Considering the high prevalence of violence experienced by emergency nurses, hospitals must develop and manage preventive education programs and policy.

• Journal of Korean Academy of Nursing
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• v.36 no.7
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• pp.1253-1264
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• 2006

Purpose: The purpose of this study was to understand conversations and to identify typical conversational problems between nurses and patients with dementia. Method: A conversation analysis method was used. The data was collected in a geriatric institutional setting, using a videotape recorder, and transcribed. The transcribed data was analyzed in terms of expressions, contents, and relationships to identify communicative problems and their resolutions, Results: Among a total of 532 episodes, 440(82.7%) we're identified as nurse-involved episodes. In addition, 66 of the 440 episodes were selected based on the significance of the conversation. The communicative problems between nurses and patients in terms of expressions were identified as 'directive and authoritative expressions', 'emotional and competitive expressions', 'evasive and on-looking expressions', and 'excessive use of title only', such as calling them granny or grandpa without proper names. In terms of content and relationships, 'lack of themes in psychosocial areas' and 'nurse-led relations' were identified respectively as communicative problems. Conclusion: The results of this study will provide substantial guidelines for nurses in caring for elderly patients with dementia by deeply understanding linguistic structures and problems of everyday conversations between nurses and patients with dementia.

• Journal of Chest Surgery
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• v.17 no.4
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• pp.678-686
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• 1984

Between Jan. 1978, and Dec. 1983, a total and consecutive 117 patients have undergone cardiac valve replacement using various artificial tissue valve. Out of 117 patients, single valve surgery was 78 consisted of MVR 74, AVR 3 and AVR & supracoronary ascending aorta replacement 1. Multiple valve surgery was 39 cases consisted of MVR+TAP 20, MVR+AVR 13 and so on. Early death with 30 days after operation was 12 cases [early mortality 10.3%] and causes of death were cardiac origin 5, technical problem 4, and others 3. The 105 early survivors were followed-up for a total of 190.5 years over a period of 2 to 64 months [Mean\ulcornerD:21.9\ulcorner4.9 months]. During follow-up, 7 cases died [late mortality:6.7%]. The rate of thromboembolism was 2.1% episodes per patient-year and bleeding due to anticoagulant was 3.1% episodes per patient-year and valve failure was 1.6% episodes per patient-year. Actuarial analysis of late results indicated an expected survival rate at 5 years of 84.6% for patients with single valve surgery and 82.1% for patient with multiple valve surgery and overall was 83.8%. Symptomatically, 86.7% of patients were in NYHA class I or II at the end of follow-up.

• Journal of Korean Society for Atmospheric Environment
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• v.26 no.2
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• pp.161-176
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• 2010

We examined high ozone episodes observed during the intensive measurement periods (11 May~21 June and 30 July~11 August 2009) in the Gulf of Gwangyang. During that period, there were a few events (or days) in which 1 hr averaged ozone concentrations were greater than 100 ppbv. The analysis of ozone budget and photochemical characteristics related to the ozone production was carried out using a photochemical box model. Ozone sensitivity to $NO_x$ and VOCs was also examined in the study area during the measurement period. Diurnal variation of ozone during the episodes was similar to that of odd hydrogen radicals ($HO_2,CH_3O_2$, and $RO_2$), suggesting significant correlation with photochemical production of ozone during the episodes. In general, ozone concentration in the study area during the measurement period was sensitive to VOCs, whereas ozone was sensitive to $NO_x$ under certain conditions. Ozone sensitivity assessment using a radical budget analysis and $NO_x$/VOCs-control strategy was consistent with that using indicator species ($H_2O_2/HNO_3$ ratio).

• Asian Journal of Atmospheric Environment
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• v.9 no.1
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• pp.48-56
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• 2015

The trajectory analysis of boundary layer ozone data at four regional sites in the East Asian outflow regions in Japan was carried out together with boundary layer ozone data observed at Mt. Tai and Mt. Huang in the source region of central eastern China during the monsoon onset in May-June 2003 and 2004. At all sites, the influences of anthropogenic emissions from East Asia have been found. During May and June 2004, the evidences of direct pollution transport from central eastern China to Hedo, an outflow site in Okinawa Island were observed. Ozone mixing ratios associated with air masses from central eastern China averaged 45 ppb while those associated with clean air masses from the Pacific were only 14 ppb, which resulted in averaged 31 ppb increase of ozone mixing ratios during the pollution episodes from central eastern China at Cape Hedo. Using transport time analysis and averaging all ozone episodes transported from central eastern China, the ozone dilution rate of 5.4 ppb per day was roughly estimated during air masses transported from source to outflow regions at Hedo. In the regions nearby Japanese mainland, however ozone increases by long-range transports were more related to both domestic and East Asian sources as a whole.

• Journal of the Korea Institute of Information and Communication Engineering
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• v.4 no.5
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• pp.971-976
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• 2000

The main objective of this paper is to present the rain cell size distribution observed during squall line episodes in the Sudano-Sahelian region. The used data were collected during the EPSAT Program [Etude des Precipitation par SATellite (Satellites Study of Precipitation)] which has been developed since 1958, on an experimental area located near Niamey, Niger (2 10′32"E, 13 28′38"N). The data were obtained with a C-band radar and a network composed of approximately 100 raingages over a 10,000 $\textrm{km}^2$. In this work a culling of the squall line episodes was made for the 1992 rainy season. After radar data calibration using the raingage network a number of PPI (Plan Position Indicator) images were generated. Each image was then treated in order to obtain a series of radar reflectivity (Z) maps. To describe the cell distribution, a contouring program was used to analyze the areas with rain rate greater than or equal to the contour threshold (R$\geq$$\tau$). 24700 contours were generated, where each iso-pleth belongs to a predefined threshold. Computing each cell surface and relating its area to an equi-circle (a circle having the same area as the cell), a statistical analysis was made. The results show that the number of rain cells having a given size is an inverse exponential function of the equivalent radius. The average and median equivalent radii ate 1.4 and 0.69 In respectively. Implications of these results for the precipitation estimation using threshold methods are discussed.

• Asian Pacific Journal of Cancer Prevention
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• v.16 no.14
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• pp.5691-5695
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• 2015

Background: Continuous surveillance of pattern of blood stream infection is necessary in febrile neutropenia (FN)especially with the recent escalating trend in the management of pediatric cancer patients towards intensified regimens and with the increase in infections caused by resistant organisms limiting the choice of antibiotics. Aim: To monitor change in pattern of blood stream infections (BSI) in FN pediatric cancer patients. Materials and Methods: Surveillance of FN episodes with positive BSI was prospectively monitored and compared to a previous surveillance in the same pediatric oncology unit. Results: A total of 232 BSI positive episodes were documented in 192 patients during a 6 months period. The results of recent surveillance analysis showed an increase in intensified regimens of chemotherapy, antimicrobial resistance, fungal infections, and prolonged duration of episodes when compared to previous surveillance, with p value sof <0.001, 0.005, 0.021, and <0.001, respectively. There was an apparent decrease in the crude mortality but this was not statistically significant, to 6% in 2011 from 10 % in 2006. Conclusions: The pattern of BSI at our institution is still inclining towards gram positive organisms but is showing a shift towards more antibiotic resistance and fungal infections.

• Journal of Environmental Science International
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• v.29 no.7
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• pp.761-772
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• 2020

This research investigated the meteorologically relevant characteristics of high PM_2.5 episodes in Busan. The number of days when daily mean PM₁₀ concentration exceeded 100 ㎍/㎥ and the PM_2.5 concentration exceeded 50 ㎍/㎥ over the last four years in Busan were 24 and 58, respectively. Haze occurrence frequency was 37.6% in winter, 27.4% in spring, 18.6% in fall, and 16.4% in summer. Asian dust occurrence frequency was 81.8% in spring, 9.1% in fall and winter, and 0% in summer. During summer in Busan, high PM_2.5 episode occurred under the following meteorological conditions. 1) Daytime sea breeze. 2) Mist and haze present throuout the day. 3) Anti-cyclone located around the Korean peninsula. 4) Stable layer formed in the lower atmosphere. 5) Air parcel reached Busan by local transport rather than by long-range transport. These results indicate that understanding the meteorological relevance of high PM_2.5 episodes could provide insight for establishing a strategy to control urban air quality.