• The Korean Journal of Emergency Medical Services
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• v.20 no.3
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• pp.107-120
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• 2016

Purpose: The purpose of this study was to investigate the factors influencing death anxiety, hospices knowledge, and attitude towards end-of-life care among paramedic students. Methods: A self-reported questionnaire was completed by 196 paramedic students in D university college in J city from November 2011 to November 2014. The study instruments included death anxiety, hospices knowledge, and attitude towards end-of-life care. Data were analyzed by t test, ANOVA, post hoc $Scheff{\acute{e}}$ test, Pearson's correlation test, and stepwise multiple regression analysis using SPSS v. 20.0. Results: According to a stepwise regression on the factors influencing attitudes towards end-of-life care, 80.4% of variance (F=161.360, p<.001) was explained by experience of death, hospices knowledge, disappearance of death anxiety, satisfaction with relationships (${\geq}2$) and student attitude toward end-of-life care. In addition, 44.1% of the variance (F=39.434, p<.001) was explained by experience of death, satisfaction with relationship(${\leq}4$), warning of others about death anxiety, and family attitude towards end-of-life care. Conclusion: The attitude towards end-of-life care was influenced by hospices knowledge and death anxiety in paramedic students. It is necessary to provide training in understanding attitudes towards death anxiety and end-of-life care. An effective educational program should be developed and implemented among paramedic students to improve their awareness of death and anxiety hospices knowledge.

• Korean Journal of Materials Research
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• v.22 no.5
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• pp.227-236
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• 2012

Ionomer is a thermoplastic that is composed of covalent bonds and ionic bonds. It is possible to use this material in processes such as injection molding or extrusion molding due to the material's high oil resistance, weatherproof characteristics, and shock resistance. In this study, a new ionomer having a multifunctional group was prepared by a stepwise neutralization system with the addition of acidic and salt additives. In step I, to increase the contents of the multifunctional group and the acid degree in ethylene acrylic acid (EAA), MGA was added to the ionomer resin (EAA). A new ionomer was prepared via the traditional preparation method of the ionic cross-linking process. In step II, metal salt was added to the mixture of EAA and MGA. The extrusion process was performed using a twin extruder (L/D = 40, size : ${\varphi}30$). Ionomer film was prepared for evaluation of gas permeability by using the compression molding process. The degree of neutralized and ionic cross-linked new ionomer was confirmed by FT-IR and XRD analysis. In order to estimate the neutralization of the new ionomer film, various properties such as gas permeation and mechanical properties were measured. The physical strength and anti-scratch property of the new ionomer were improved with increase of the neutralization degree. The gas barrier property of the new ionomer was improved through the introduction of an ionic site. Also, the ionic degree of cross-linking and gas barrier property of the ionomer membrane prepared by stepwise neutralization were increased.

• PNF and Movement
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• v.16 no.1
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• pp.59-66
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• 2018

Purpose: This study aimed (1) to identify asymmetry observed in electromyography (EMG) activity patterns of lower limb muscles between affected and unaffected sides of stroke patients during sit to stand (STS) movement and (2) to identify the muscles of the paretic lower limb that affected STS performance in stroke patients. Methods: This study consisted of 27 patients (15 males and 12 females) with poststroke hemiparesis. The activation of the rectus femoris (RF), tibialis anterior (TA), and gastrocnemius (GCM) of the affected side and unaffected side during STS movement were recorded using surface EMG. In addition, EMG lower limb muscle activation patterns were measured in the all section, pre-thigh off (pre-TO), and post-thigh off (post-TO) section. All measurements were obtained during five repetitions of the STS (FTSTS) movement. An independent t-test was performed to compare the affected side and unaffected side of the lower limb during the STS movement. A stepwise linear regression analysis was conducted to identify the muscles that affected STS performance. Results: Activation of both the RF and TA significantly affected the lower limb during the STS movement (p<0.05). Two muscles showed a difference on the post-TO section. The results of the stepwise multiple regression analysis showed that the RF and TA muscles of the affected lower limb were affected in FTSTS. Conclusion: These results provide a basis for reinforcement training, focusing on the RF and TA muscles of the affected side of stroke patients to improve asymmetric movement and performance in STS movement.

• Journal of Haehwa Medicine
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• v.5 no.2
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• pp.485-496
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• 1997

This study explored the relationships between Husband's emotional support and the mother's postpartum depression. The purpose of this study was to contribute to theoretical understanding of the relationships among these two variables and eventually to direct the planning of nursing care that enhance the health status of mothers in the postpartum period. Data were collected from January to June, 1995, with 47 postpartum Korean mothers in NewHampshire state in The United States of America. Postpartum depression was measured by Jung's Self-rating Depression Scale and husband's support was measured by Husband's support scale developed by Cho, Young Sook. Postpartum depression and husband's support were measured by postpartum mothers on the 3rd postpartum day and 2 weeks. The data were analysed by an SPSS computerized program and Percentages, t-test, paired t-test. ANOVA, Pearson correlation coefficients, and Stepwise multiple regression were used. The result of this study were summerized as follows ; 1. Mother's postpartum depression was greater at two weeks than the 3rd day (t=-2.64, p<.05). 2. Mother's percieved husband's supportive behavior was lower at 2 weeks than the 3rd day(t=-3.14,p<.01) 3. The higher the husband's supportive behavior, the lower the postpartum mother's depression (r=-2650,-2845;p<.01) 4. In this study, variables related to the mother's postpartum depression were husband's support, how much the husband liked the baby, occupation, and the knowledge of how to care for the baby. 5. In addition, by using Stepwise multiple regression analysis, it was determined that the main influencing factors on the postpartum depression. The variables - husband's support, how much the husband liked the baby and job made it possible to explain 48.61% of variance in postpartum depression. In conclusion, this study revealed that husband's support is an important factor that decrease the immigrant mother's postpartum depression.

• PNF and Movement
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• v.10 no.3
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• pp.7-18
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• 2012

Purpose : This study was to compare the difference Trunk Control Test(TCT), Postural Assessment Scale for Stroke(PASS-TC), and Trunk Impairment Scale(TIS) and its subscales in relation to the difference MBI(Modified Barthel Index), BBS(Berg Balance Scale), and to establish the association between MBI, BBS, Fugl Meyer-motor function(FM-M), and to predict MBI-subscales from the variables. Methods : 58 stroke patients, attending a rehabilitation programme, participated in the study. Trunk control was measured with the use of the TCT, PASS-TC, TIS, and the performance of Activities daily living was obtained by MBI, and dynamic balance ability(by BBS). Trunk control scores from the difference MBI, BBS were compared using the 1-way ANOVA(Mann Whitney U test) and the data were analyzed using Pearson product correlation. Multiple stepwise regression analyses were performed to identify prognostic factors for ADL subscale. Results : Trunk control scores showed significant differences between MBI(F=2.139~13.737, p<.05~.001), BBS(t=3.491~7.705, p<.01~.001). It was significantly related with value of the MBI(r=.25~.50), BBS(r=.38~.68), FMM( r=.31~.48). Stepwise linear regression analysis showed an additional, significant contribution of the TCT, in addition to the PASS-TC, dynamic sitting balance subscale of the TIS for measures of MBI subscales. Conclusion : Measures of trunk control were significantly related with values of MBI, BBS score, so the management of trunk rehabilitation after stroke should be emphasized. The use of both quantitative and qualitative scales was shown to be a good measuring instrument for the classification of the general performance of the stroke patients. Further study about trunk control is needed using a longitudinal study design.

• Journal of Fisheries and Marine Sciences Education
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• v.7 no.1
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• pp.111-126
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• 1995

In general, the electromagnetic transient phenomenon always exists in induction motor(IM) with the torque change. The control performance of IM is very worse than that of D.C motor owing to this transient phenomenon. So many studies about the elimination methods of the transient phenomenon have been making progress. Interesting methods of them are the Field acceleration method(FAM) and the method of impulse addition on the input voltage at the time point of torque change. In this paper, first, the circuit equation of IM is derived from the phase segregation method. The torque equation consisted of the stator and rotor currents is derived from the solving of the circuit equation. As we well known, the transient terms exist in this the torque equation. The method of impulse addition on the input voltage at the instance of torque change is confirmed theoretically for the elimination of the transient phenomenon. With the base on it, the author proposed a real time algorithm to eliminate the transient terms. The control system is consisted of the PI controller with the feedforward of torque change. The author could confirm that the quick stepwise responses of torque and speed can be obtained from response simulations.

• Bulletin of the Korean Chemical Society
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• v.32 no.spc8
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• pp.3031-3038
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• 2011

Ion-coordinating ruthenium complexes [cis-Ru(dcbpy)(L)(NCS)$_2$, where dcbpy is 4,4'-dicarboxylic acid-2,2'-bipyridine and L is 1,4,7,10-tetraoxa-13-azacyclopentadecane, JK-121, or bis(2-(2-methoxy-ethoxy)ethyl) amine, JK-122] have been synthesized and characterized using $^1H$ NMR, Fourier transform IR, UV/vis spectroscopy, and cyclic voltammetry. The effect of $Li^+$ in the electrolyte on the photovoltaic performance was investigated. With the stepwise addition of $Li^+$ to a liquid electrolyte, the device shows significant increase in the photo-current density, but a small decrease in the open circuit voltage. The solar cell with a hole conductor, the addition of $Li^+$ resulted in a 30% improvement in efficiency. The JK-121 sensitized cells in the liquid and solid-state electrolyte give power conversion efficiencies of 6.95% and 2.59%, respectively, under the simulated sunlight.

• Journal of Powder Materials
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• v.8 no.2
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• pp.131-135
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• 2001

The ferroelectric properties of barium titanate strongly depend on its microstructure, in particular, grain size and distribution. During sintering, $BaTiO_3$ usually exhibits abnormal grain growth, which deteriorates considerably the ferroelectric properties. A typical technique to suppress the abnormal grain growth is the addition of dopants. Dopant addition, however, affects the ferroelectric properties and thus limits the application of $BaTiO_3$. Here, we report a simple but novel technique to prevent the abnormal grain growth of $BaTiO_3$ and to overcome the limitation of dopant use. The technique consists of stepwise sintering in a reducing atmosphere and in an oxidizing atmosphere. The materials prepared by the present technique exhibit uniform grain size and high dielectric properties. The technique should provide opportunities of having $BaTiO_3$-based materials with superior ferroelectric properties.

• Journal of the Korea Academia-Industrial cooperation Society
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• v.17 no.11
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• pp.421-431
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• 2016

The purpose of this study was to identify the influence of depression, social isolation, and meaning in life on the swallowing related quality of life in patients with dysphagia. In this study, 87 the dysphagia patients diagnosed with stroke, degenerative disease, and neurological disorder in a general or rehabilitation hospital in Seoul, Gyeonggi, and Incheon were assessed. The data were collected between February and April, 2015 using CES-D, RULS, PIL, SWAL-QOL. The data were analyzed using descriptive statistics, t-test, ANOVA, Pearson's correlation, and stepwise multiple regression with SPSS 22.0. Of the participants, 20.7% reported having had depression, 92.0% middle-high social isolation and 64.4% existential vacuum. The mean scores were SWAL- QOL 158.89(35.97). Stepwise multiple regression revealed that tube feeding to have the greatest effect on SWAL-QOL(${\beta}=-0.57$, p<.001), followed in order by age (${\beta}=0.26$, p=.001), lower MIL (${\beta}=0.19$ p=.014), and education (${\beta}=0.17$, p=.032). The most influential factor to SWAL-QOL was tube feeding. These variables accounted for 50.7% of SWAL-QOL in dysphagia patients (F=28.84 p=.031). Therefore, it is essential to develop the intervention that can improve the meaning in life in patients with dysphagia. In addition there is a need to study the psychological factors and quality of life of tube feeding.

• Journal of Navigation and Port Research
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• v.43 no.1
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• pp.72-78
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• 2019

The second-hand ship market provides immediate access to the freight market for shipping investors. When introducing second-hand vessels, the precise estimate of the price is crucial to the decision-making process because it directly affects the burden of capital cost to investors in the future. Previous studies on the second-hand market have mainly focused on the market efficiency. The number of papers on the estimation of second-hand vessel values is very limited. This study proposes an artificial neural network model that has not been attempted in previous studies. Six factors, freight, new-building price, orderbook, scrap price, age and vessel size, that affect the second-hand ship price were identified through literature review. The employed data is 366 real trading records of Panamax second-hand vessels reported to Clarkson between January 2016 and December 2018. Statistical filtering was carried out through correlation analysis and stepwise regression analysis, and three parameters, which are freight, age and size, were selected. Ten-fold cross validation was used to estimate the hyper-parameters of the artificial neural network model. The result of this study confirmed that the performance of the artificial neural network model is better than that of simple stepwise regression analysis. The application of the statistical verification process and artificial neural network model differentiates this paper from others. In addition, it is expected that a scientific model that satisfies both statistical rationality and accuracy of the results will make a contribution to real-life practices.