• Journal of the Korean Ceramic Society
• /
• v.51 no.4
• /
• pp.265-270
• /
• 2014

Among the Ruddlesden-Popper series, $La_4Ni_3O_{10}$ has received widespread attention as a promising cathode material by reason of its favorable properties for realizing high performance of intermediate temperature solid oxide fuel cells (IT-SOFCs). The $La_4Ni_3O_{10}$ cathode is prepared using the facile sol-gel method by employing tri-blockcopolymer (F127) to obtain a single phase in a short sintering time. There are no reactions between the $La_4Ni_3O_{10}$ cathode and the $Ce_{0.9}Gd_{0.1}O_{2-\delta}$ (GDC) electrolyte upon sintering at $1000^{\circ}C$, indicating that the $La_4Ni_3O_{10}$ cathode has good chemical compatibility with the GDC electrolyte. The maximum electrical conductivity of $La_4Ni_3O_{10}$ reaches approximately 240 S $cm^{-1}$ at $100^{\circ}C$ and gradually decreases with increasing temperaturein air atmosphere. The area specific resistance value of $La_4Ni_3O_{10}$ composite with 40 wt% GDC is $0.435{\Omega}cm^2$ at $700^{\circ}C$. These data allow us to propose that the $La_4Ni_3O_{10}$-GDC composite cathode is a good candidate for IT-SOFC applications.

• Clinical and Experimental Pediatrics
• /
• v.45 no.5
• /
• pp.659-663
• /
• 2002

${\beta}$ thalassemias are usually transmitted as autosomal recessive traits. However, some dominant forms of ${\beta}$ thalassemia have been identified in individuals who have inherited a single copy of an abnormal ${\beta}$ globin gene. Thalassemia intermedia with mild anemia, jaundice, and splenomegaly has been observed in these patients. Electrophoresis has shown elevated Hemoglobin(Hb) $A_2$ and Hb F levels. In particular, there are inclusion bodies in the erythroid precursors and peripheral red blood cells after splenectomy. The molecular basis of these dominant ${\beta}$ thalassemias is heterogeneous. The authors studied the first Korean case of dominantly inherited ${\beta}$ thalassemia due to Hb Dieppe. Hb Dieppe is a missense mutation of ${\beta}$ codon $127(CAG{\rightarrow}CGG)Gln{\rightarrow}Arg$. The patient in this case was characterized by moderate anemia, hypochromia, microcytosis, elevated Hb $A_2$ levels, elevated Hb F levels and splenomegaly. The father of the patient also has the same disease. We report this case and review related literature.

• Polymer(Korea)
• /
• v.36 no.2
• /
• pp.163-168
• /
• 2012

Recently, along with technology development of endoscopic equipment, the stent technology has been developed for the convenience of operation, shortening of recovery times, and reduction of patient's pain. In this study, paclitaxel-eluting metal stents for treatment of biliary benign stenosis were developed through an electrospray-coating method. Polyether-based polyurethane (PELLETHANE 2363-80AE$^{(R)}$)) and paclitaxel were coated onto the surface of a metallic stent and Pluronic F127 was used as an additive. As a result, physicochemical characterization of paclitaxel via SEM, FTIR, contact angle and XRD techniques revealed the information of solid state of paclitaxel-loaded PU film. The in vitro release profile showed a slower release rate with a higher content of paclitaxel.

• Parasites, Hosts and Diseases
• /
• v.46 no.3
• /
• pp.127-132
• /
• 2008

Clonorchis sinensis is one of the most prevalent parasitic helminths in Korea. Although cholangiocarcinoma can be induced by C. sinensis infection, the underlying mechanism is not clearly understood. To assess the role of C. sinensis infection in carcinogenesis, an in vitro system was established using the human epithelial cell line HEK293T. In cells exposed to the excretory/secretory products (ESP) of C. sinensis and the carcinogen dimethylnitrosamine (DMN), cellular proliferation and the proportion of cells in the G2/M phase increased. Moreover, the expression of the cell cycle proteins E2F1, p-pRb, and cyclin B was dramatically increased when ESP and DMN were added together. Similarly, the transcription factor E2F1 showed its highest level of activity when ESP and DMN were added simultaneously. These findings indicate that DMN and ESP synergistically affect the regulation of cell cycle-related proteins. Our results suggest that exposure to C. sinensis and a small amount of a carcinogen such as DMN can promote carcinogenesis in the bile duct epithelium via uncontrolled cellular proliferation and the upregulation of cell cycle-related proteins.

• Journal of Korean Clinical Nursing Research
• /
• v.16 no.2
• /
• pp.127-140
• /
• 2010

Purpose: This study was performed to verify reliability and validity of Korean Patient Classification System for nurses(KPCS-1), to estimate nursing time conversion index, and to classify patients into groups according to KPCS-1 scores. Methods: KPCS-1 was revised from KPCS by a professional review team. Interrater reliability and construct validity of KPCS-1 were verified by data from 433 patients. Direct and indirect nursing time of 204 patients were measured by stopwatch observation and self reports for 24 hours. Nursing time conversion index was calculated. Results: KPCS-1 consisted of 12 area, 50 nursing activities, and 73 items. The interrater reliability was tested between two nurse group (r=.88, p<.001) and construct validity was verified according to medical department (F=10.97, p<.001) and patient pattern (F=5.54, p=.001). The correlation of nursing time and classification score was also statistically significant (r=.56, p<.001). The nursing time conversion index was 9.03 minutes per 1 classification score. The patients were classified into 4 groups by the classification scores. Conclusion: KPCS-1 can be a useful factor type patient classification system for general ward. Further study is needed to evaluate validity and reliability for refining KPCS-1 and to develop ways connecting the scores with nursing outcomes.

• Journal of the Korea Academia-Industrial cooperation Society
• /
• v.19 no.1
• /
• pp.555-565
• /
• 2018

This study was conducted to investigate factors influencing career maturity in nursing students. A convenience sample of 230 nursing student was selected from S city, between 20 October and 10 November 2017. Data were collected using a structured questionnaire and analyzed using descriptive statistics, t-test, one-way ANOVA, Pearson's correlation, and multiple regression analysis with the SPSS/WIN 21.0 program. Factors that influenced career maturity included gender(t=2.117, p=.035), age(t=-2.572, p=.011), grade(F=4.716, p=.010), education at the time of admission(t=-2.695, p=.008) and perceived academic achievement(F=11.127, p<.001). Career maturity showed a positive correlation with career decision-making self-efficacy(r=.585, p<.001) and problem solving ability(r=.407, p <.001), but a negative correlation with job-seeking stress(r=-.424, p<.001). Regression analysis revealed that significant factors influencing career maturity were career decision-making self-efficacy, problem solving ability and job-seeking stress. This regression model explained 42.8% of the variance in the career maturity. Based on these findings, it is necessary to develop and test programs to ensure an improvement in career decision-making self-efficacy, problem solving ability and job-seeking stress among nursing students to increase their career maturity.

• Journal of the Korea Academia-Industrial cooperation Society
• /
• v.17 no.4
• /
• pp.303-311
• /
• 2016

This study examined the empathic ability and communication ability of nursing students according to Myers-Briggs type indicator(MBTI) personality type. This study was a cross sectional survey and the data was collected from 127 nursing students by means of self-reported questionnaires from October 5 to 30, 2015. The data collected was analyzed on SPSS win 18.0. Fourteen personality types were observed in this study participants. The SF type was the highest with a mean of 3.77 in empathic ability according to 4 functions of MBTI and the NF type was the highest with a mean of 3.81 in communication ability according to 4 functions of MBTI. The SP type and NF type was the highest with a mean of 3.71 in the empathic ability according to the 4 temperaments of MBTI and the NF type was the highest with a mean of 3.81 in the communication ability according to 4 temperaments of MBTI. Significant differences in the communication ability were observed according to 4 functions (F=3.194, p=.026) and 4 temperaments (F=3.004, p=.033) of MBTI. Further study will be needed to identify the effects of a self-understanding program on the empathic ability and communication ability. It is important to understand the nursing students' diversity and reflect it in a school curriculum.

• Ocean and Polar Research
• /
• v.28 no.4
• /
• pp.395-405
• /
• 2006

We measured the fugacity of $CO_2$ $(fCO_2)$, temperature, salinity, nutrients and chlorophyll a in the surface water of the western North Pacific $(4^{\circ}30'{\sim}33^{\circ}10'N,\;144^{\circ}20'{\sim}127^{\circ}35'E)$ in September 2002. There were zonally several major currents which have characteristics of specific temperature and salinity (NECC, North Equatorial Counter Current; NEC, North Equatorial Current; Kuroshio etc.). Surface $fCO_2$ distribution was clearly distinguished into two groups, tropical and subtropical areas of which boundary was $20^{\circ}N$. In the tropical Int surface $fCO_2$ was mainly controlled by temperature, while in the subtropical area, surface $fCO_2$ was dependent on total inorganic carbon contents. Air-sea $CO_2$ flux showed a large spatial variation, with a range of $-0.69{\sim}0.79 mmole\;m^{-2}day^{-1}$. In the area of AE (Anticyclonic Eddy), SM(Southern Mixed region) and NM (Northern Mixed region), the ocean acted as a weak source of $CO_2$ $(0.6{\sim}0.79 mmole\; m^{-2}day^{-1})$. In NECC, NEC, Kuroshio and ECS (East China Sea), however, the fluxes were estimated to be $-0.3mmole\; m^{-2}day^{-1})$ for the first three regions and $-1.2mmole\; m^{-2}day^{-1})$ for ECS respectively, indicating that these areas acted as sinks of $CO_2$. The average air-sea flux in the entire study area was $0.15mmole\;m^{-2}day^{-1})$, implying that the western North Pacific was a weak source of $CO_2$ during the study period.

• Journal of the Korean Society for Heat Treatment
• /
• v.13 no.6
• /
• pp.383-390
• /
• 2000

The static creep behaviour of AlSl 420F stainless steel was investigated over the temperature range of $540{\sim}585^{\circ}C$ and the stress range of $13{\sim}19kg/mm^2$ (127.4~186.2MPa). Constant stress creep tests were carried out in the experiment. Measured stress exponent, n, for the creep deformation of the alloy under the given conditions was found to vary at the range of 9.59, 9.15, 8.78, and 8.53 for the temperature of 540, 555, 570, and $585^{\circ}C$ respectively. The activation energy, Qc, for the creep deformation was 106.42, 102.58,97.81, and 94.58 kcal/mole for the stress of 13, 15, 17, and $19kg/mm^2$, respectively. Lason-Miller parameter, P, for the crept specimens for AlSl 420F stainless steel was measured as $P=T(log\;t_T+21)$. The empirical static creep rate obtained by the regression analysis was as follows. $${\varepsilon}={\exp}[(3.79{\times}10^{-2}{\sigma}+2.722)T-3.0747{\sigma}+28.109]{\times}{\sigma}^{(-2.367{\times}10^{-2}T+22.33)}{\exp}\left[-\frac{(-2.015{\sigma}+132.580){\times}10^3}{RT}\right]$$ The failure plane were observed, intergranular fracture was dominated by r (round) type crack over the experimental range.

• Proceedings of the Korean Institute of Electrical and Electronic Material Engineers Conference
• /
• 2003.04a
• /
• pp.127-130
• /
• 2003

We have carried out two-beam interference experiment to form holographic grating on amorphous $As_{40}Ge_{10}Se_{15}S_{35}$ single-laver, $MgF_{2}/As_{40}Ge_{10}Se_{15}S_{35}$ muliti-layer. In this study holographic grating formed using He-Ne laser(632.8nm) under different polarization state(intensity, phase polarization holography). The diffraction efficiency was obtained by first order intensity. The maximum diffraction efficiency of $As_{40}Ge_{10}Se_{15}S_{35}$ single-laver was 0.8% and The maximum diffraction efficiency of $MgF_{2}/As_{40}Ge_{10}Se_{15}S_{35}$ multi-layer(multi-layer I, multi-layer II) were 1.4% and 3.1%.