• Composites Research
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• v.37 no.4
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• pp.275-285
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• 2024

This paper presents research trends in predicting the deformation of carbon fiber reinforced thermoplastic (CFRTP) composites during thermoforming. Various thermoforming variables that must be considered during the CFRTP thermoforming stages are investigated, and factors influencing process-induced deformation are analyzed. Key material behavior models, such as crystallinity and viscoelastic, which are important for predicting thermoforming deformation, are also examined. Additionally, trends in predicting CFRTP thermoforming deformation using finite element analysis with material behavior models and machine learning techniques are analyzed. In summary, more precise prediction techniques for thermoforming deformation can be developed by associating them with material behavior models and considering thermoforming variables.

• Clinical and Experimental Pediatrics
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• v.52 no.7
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• pp.785-790
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• 2009

Purpose : Febrile convulsions are a common pediatric neurological disease, and it is important to prevent such a disease by controlling the risk factors that may recur. A recent report states that influenza virus infections have a high probability of a relationship with febrile convulsions; therefore, it is necessary to identify the clinical properties of febrile convulsions in relation to domestic influenza virus infections. Methods : Between November 2005 and February 2008, children hospitalized because of febrile convulsions and subsequently confirmed to have influenza infections were enrolled as subjects (patient group, n=11). The control subjects were those admitted with influenza virus infections but no febrile convulsions (control group 1, n=46) and those who developed febrile convulsions without influenza virus infection (control group 2, n=53). Results : The patient group showed a higher maximum body temperature ($39.3{\pm}0.5^{\circ}C$), more histories of past febrile convulsions (72.7%), and a shorter total duration of fever ($2.9{\pm}1.2$ days) than control group 1. When multivariate analysis was performed, the probability of febrile convulsions was found to be as high as 225.9 times in patients who had influenza virus infections with a past history of febrile convulsions (OR=225.9, 95% CI: 1.7-4780.0, P<0.05). When patients with febrile convulsions were compared based on the symptoms of influenza virus infections, the patient group showed a shorter duration of fever ($0.9{\pm}0.7$ days) before convulsion than control group 2; these convulsions were mostly a recurrence of febrile convulsions. When multivariate analysis was performed, the cases with a past history of febrile convulsions showed 5.5 times (OR=5.5, 95% CI: 1.2-25.1, P=0.03) the probability of convulsions when infected with the influenza virus, and this probability decreased by 0.3 times over one-day increments of the febrile period until febrile convulsions (95% CI: 0.1-0.9, P=0.02). Maximum body temperature, total duration of fever, family history of febrile convulsions, and complex febrile convulsions did not show a statistical significance. Conclusion : In cases of pediatric influenza virus infection, the past history of febrile convulsions could be identified within the risk factor of recurrent febrile convulsions. Therefore, influenza vaccination of children having a past history of febrile convulsions will be helpful to avoid the recurrence of these convulsions.

• Clinical and Experimental Pediatrics
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• v.45 no.11
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• pp.1403-1410
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• 2002

Purpose : In previous studies, various risk factors for recurrent febrile seizures have been identified. But none of these risk factors alone could sufficiently discriminate children at high or low risk for recurrent seizures. Therefore, we tried to identify patients at high risk of recurrent febrile seizures by combining risk factors. Methods : Two hundred and four children who had been admitted to our hospital from March, 1997 to July, 1999 with their first febrile seizures were enrolled in our study, and followed up over 2 years. We investigated the recurrence rate according to variables such as sex, age at first febrile seizure, family history of febrile seizures or epilepsy, type of the first seizure, neurologic abnormality and EEG abnormality. Results : Family history of febrile seizures and age at first febrile seizure(<12 months) were significant independent risk factors for recurrent febrile seizures. With these two combined factors, four groups were allocated and the recurrence rate by each group was designated as follows: group with no family history of febrile seizures and age at first febrile seizure ${\geq}12$ months (no risk factor), 43.8%; the group with no family history and age <12 months(one risk factor), 61.7%; group with family history and age ${\geq}12$ months(one risk factor), 64.5%; group with family history and age <12 months(two risk factors), 90.4%. Conclusion : A correlation between numbers of risk factors and recurrence rate was present and the children with a family history of febrile seizures and a young age at onset(<12 months) were regarded as a high risk group of recurrence.

• Proceedings of the Korean Society of Fisheries Technology Conference
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• 2003.05a
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• pp.233-234
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• 2003

근교약세의 요인으로는 열성유해유전자의 호모 접합체화에 의한 적응성의 저하가 생각되어진다. 그 중에서도 가장 유해성이 높은 유전자로는 열성치사유전자가 있다. 그러나, 이러한 열성 치사유전자을 보유한 개체는 죽어버리기 때문에 직접적인 검출은 불가능하다. 따라서, 동조염색체의 호모화가 되는 교배실험과 표식유전자에 의한 연사분석이 필요하다. 본 연구는 참전복의 열성치사유전자의 유무을 명확히 파악하기 위하여 형매교배와 비형매교배을 포함한 전체교배를 하였으며, 참전복을 대상으로 개발한 마이크로사데라이트(microsatellite)좌을 유전표식으로 이용하여 각 교배구의 유전자형의 분리를 조사했다. (중략)

• Journal of the Korean Child Neurology Society
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• v.26 no.4
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• pp.221-226
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• 2018

Purpose: Febrile seizures (FSs) are the most common type of seizure in the first 5 years of life and are frequently associated with viral infections. Influenza infection is associated with a variety of neurological conditions, including FSs. The purpose of this study was to evaluate the clinical implications of influenza infection in FSs. Methods: In total, 388 children with FS were divided into two groups: FS with influenza infection (n=75) and FSs without influenza infection (n=313). Their medical records, including seizure type, frequency, duration, and familial history of FSs or epilepsy, were retrospectively reviewed and the clinical characteristics of the two groups were compared. Results: In total, 75 of the 388 children (19.3%) had FSs associated with influenza infection; such children were significantly older than those with FSs without influenza infection ($34.9{\pm}22.3$ months vs. $24.4{\pm}14.2$ months; P<0.001). The children who had more than two febrile seizures episodes were more prevalent in children with FS with influenza infection [40/75 (53.3%) vs. 92/313 (29.4%); P<0.01]. Children older than 60 months were more likely to have influenza infection compared to those aged less than 60 months [11/22 (50%) vs. 64/366 (17.5%); P=0.001]. Conclusion: Influenza infection may be associated with FSs in older children, and with recurrence of FSs. Its role in the development of afebrile seizures or subsequent epilepsy requires further investigation with long-term follow-up.

• Transactions of the Korean Society of Mechanical Engineers A
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• v.40 no.5
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• pp.505-511
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• 2016

The aim of this study is to investigate the thermoforming characteristics of an inner case with three refrigerator cavities using three-dimensional(3D) thermoforming analyses. We perform fundamental formability analyses using a 3D model of the mould for the inner case. We carry out tensile tests at the elevated temperature to examine the properties and characteristics of the thermoformed material. Then, we design sub-processes of the thermoforming process for the inner case. In addition, we develop suitable finite-element models for different sub-processes. We investigate the deformed shapes and thickness distributions of the inner case for different sub-processes using the results of the thermoforming analysis. Finally, we discuss the formability and thermoforming characteristics of the inner case with three cavities.

• Clinical and Experimental Pediatrics
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• v.53 no.3
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• pp.392-396
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• 2010

Purpose : The association between iron deficiency anemia and febrile convulsion in infants has been examined in several studies with conflicting results. Therefore, the authors aimed to evaluate the precise relationship involved. Methods : In this case-control study, the authors assessed 100 children with a diagnosis of febrile convulsion, aged between 9 months and 2 years, during January 2007 to July 2009. The control group consisted of 100 febrile children without convulsion; controls were closely matched to the cases by age, gender, and underlying disease. Results : The mean ages of the febrile convulsion and control group were $16.3{\pm}7.4$ and $15.8{\pm}6.1$ months, respectively, and the two groups had no differences in clinical features. Iron deficiency anemia (Hb <10.5 gm/dL) was more frequent in the febrile convulsion group than in the control group, although there was no statistical significance. Unexpectably, the RDW (red blood cell distribution width) was significantly lower and the MCNC (mean corpuscular hemoglobin concentration) was significantly higher among seizure cases than among the controls (P <0.05). There is no statistical difference between simple and complex febrile groups in the clinical and laboratory profiles. On multiple logistic regression analysis, iron deficiency anemia was more frequent, but the RDW was lower, among the cases with febrile convulsion, compared with the controls. Conclusions : Our study suggests that the iron deficiency anemia is associated with febrile convulsion, and screening for iron deficiency anemia should be considered in children with febrile convulsions.

• Journal of the Korean Child Neurology Society
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• v.26 no.4
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• pp.210-214
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• 2018

Purpose: A relationship between Febrile seizure (FS) and iron deficiency anemia (IDA) has been found in several studies. However, few studies have focused on the role of IDA in complex febrile seizures (CFS) and simple febrile seizures (SFS) and there is no report on whether IDA is a risk factor for recurrence. The aim of this study was to investigate the role of IDA in SFS and CFS and to examine the effect of IDA on recurrence. Methods: Patients (n=166) who had been diagnosed with FS were enrolled in our study. Subjects were divided into the following groups for analysis: the SFS and CFS groups, recurrence and non-recurrence groups. The onset age was compared in each group of patients and laboratory test results based on IDA were compared. Results: Between the SFS and the CFS groups, there was no significant difference in laboratory test results based on IDA. There was a significant difference in onset age between the two groups and the onset age tended to be lower in the CFS group (24.00 vs. 16.49 months) (P=0.004). Comparing recurrence and non-recurrence groups, the mean corpuscular volume was significantly different (P=0.043) with the recurrence group having a lower mean corpuscular volume level (78.92 vs. 77.48). The onset age in the recurrence group was lower (26.02 vs. 19.68 months). Conclusion: This study suggests that onset age could be a risk factor for CFS, and IDA may not contribute to elevating the risk of CFS. However, IDA may play an important role in the recurrence of FS.

• Child Health Nursing Research
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• v.20 no.3
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• pp.149-158
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• 2014

Purpose: The purpose of this study was to investigate caregivers' knowledge, concerns, and management of children with febrile convulsions (FC). Methods: A descriptive correlation study was conducted with 133 caregivers whose children had been diagnosed with a FC. A self-administered questionnaire was used for data collection A self-administered questionnaire was used for data collection. Descriptive statistics, t-test, one-way analysis of variance and Pearson's correlation were used for data analysis. Results: The mean percent of correct answers related to knowledge was 48.5%. Many caregivers believed that FC causes brain damage and did not know that risk of subsequent epilepsy in FC is rare. Levels of concern about FC were high. Caregivers were highly concerned about further FC attacks in the night and tended to worry that Febrile children were apt to get a fever. Many caregivers used management practices which are not recommended for FC in children. There was a statistically significant negative correlation between caregivers' knowledge and concerns about FC. There was also a positive correlation between caregivers' knowledge and management of FC. Conclusion: Findings suggest that improvements are needed in caregivers' knowledge and management of FC. Caregivers' concerns related to misconception need to be addressed. Development and evaluation of educational interventions on changing caregivers' management of FC are recommended.

• Clinical and Experimental Pediatrics
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• v.52 no.1
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• pp.81-86
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• 2009

Purpose : Febrile convulsions are classified into simple or complex types, the latter being characterized by increased risk of recurrence and progression to epilepsy. This study aimed to delineate the clinical characteristics of complex febrile convulsions. Methods : Between January 2003 and December 2006, 550 children were diagnosed with febrile convulsions at the Department of Pediatrics, Ilsan Paik Hospital. Their medical records were retrospectively reviewed for comparison between simple and complex febrile convulsions, and clinical findings of complex febrile convulsions were clarified. Results : Our subjects comprised a male-to-female ratio of 1.64:1; the age range was from 8 months to 8 years. Simple febrile convulsions comprised 432 cases, i.e., 4 times as many as complex febrile convulsions (118 cases). The causes of febrile illness included acute pharyngotonsillitis (357 cases, 64.9%), pneumonia (55 cases, 10.0%), acute gastroenteritis (37 cases, 6.7%), and otitis media (20 cases, 3.6%). We did not find any significant difference between simple and complex febrile convulsions in most clinical parameters such as gender, age, family history of febrile convulsions, and cause of febrile illness. Regarding subtypes of complex febrile convulsions, repeated convulsions were the most frequent (72.0%), followed by prolonged convulsions (16.9%) and focal convulsions (5.1%). Conclusion : We have reported here the clinical features of complex febrile convulsions. Although the results did not show any significant difference between simple and complex febrile convulsions in most clinical parameters such as gender, age, family history of febrile convulsion, and cause of febrile illness, further studies are essential to delineate complex febrile convulsions.