• Proceedings of the Korean Society for Noise and Vibration Engineering Conference
• /
• 2000.06a
• /
• pp.888-893
• /
• 2000

This experimental study is the improvement of running stability for freight car. KNR (Korean National Railroad)'s conventional wagons, light bodies running on Barber style bogies with 5-1/$2{\times}10$ journals, would be considered fundamentally to be a most difficult car to control above 100km/h. From the results of experiment, to permit high speed operation safely, was realized with the resilient side bearing. Also, equipped with resilient side bearing, and elastowedge friction elements to eliminate bolster wedge pocket wear, KNR's wagons can be secure the running stability with lower maintenance requirements than current experience.

• Korean Journal of Ecology and Environment
• /
• v.45 no.2
• /
• pp.150-157
• /
• 2012

Fish communities in river networks provide significant ecosystem services that will likely decline under future land use and climate change. We developed a model that simulates the consequences to multiple populations of one or more fish species-a meta-community-from multiple stressors across a river network. The model is spatially-explicit and age-structured, with three components: habitat suitability; population dynamics, including species interactions; and movement across a spatial network. Although this model is simple, it can form the basis of fisheries assessments and may be incorporated into an integrated modeling system for watershed management and prediction.

• Journal of Ocean Engineering and Technology
• /
• v.2 no.1
• /
• pp.71-77
• /
• 1988

적설의 다짐강도에 대한 부가물의 효과를 고찰하기 위한 연구가 수행되었다. 본 연구의 목적은 본 연구에서 얻은 결과를 토대로 적설의 압착과정을 촉신시키고 나아가서 남극의 설상로나 설상활주로 등의 다짐강도를 증진시키는 데 있다. 실험실에서의 실험결과에 의하면 처리된 눈에 소량의 톱밥을 섞었을때 더 큰 강도를 얻을 수 있다는 것을 알 수 있었으며, 이 방법은 남극과 McMurdo 설상로에 있는 시험도 에서 실제 적용되었다. 현지 실험에서 얻은 자료를 분석한 결과 적설의 고결은 일반적으로 예측되는 극한 환경에서 보다 빨리 진행되었으며, 궁극적으로 큰 지장없이 육중한 운송장비를 지지할 수 있는 충분한 다짐강도를 얻을 수 있다는 것을 알 수 있었다.

• Research in Mathematical Education
• /
• v.14 no.2
• /
• pp.173-194
• /
• 2010

This study examines the differences and similarities of mathematics teachers' subject matter knowledge among England, the Chinese mainland and Hong Kong. Data were collected from a ten-item test in the SKIMA subject matter audit instrument [Rowland, T.; Martyn, S.; Barber, P. & Heal, C. (2000). Primary teacher trainees' mathematics subject knowledge and classroom performance. In: T. Rowland & C. Morgan (eds.), Research in Mathematics Education, Volume 2 (pp.3-18). ME 2000e.03066] from over 500 participants. Results showed that participants from England performed consistently better, with those from Hong Kong being next and then followed by those from the Chinese mainland. The qualitative data revealed that participants from Hong Kong and the Chinese mainland were fluent in applying routines to solve problems, but had some difficulties in offering explanations or justifications.

• The Research Journal of the Costume Culture
• /
• v.23 no.1
• /
• pp.74-84
• /
• 2015

The purpose of this study is to examine symbolic meanings of costumes shown by portraits of King Henry VIII and use them as basic data for research on costume design of historical dramas in the Renaissance or on King Henry VIII's costume. This study attempted analysis of symbolic meanings from the paintings-related various domestic and overseas literatures, preliminary study paper, and web sites etc. The symbolic meanings expressed by the portraits of King Henry VIII are characterized by authority, innovation performance, authority, masculinity, innovation performance, artistic taste, intellectual charm, intrepidity and benevolence. Especially, the portraits of King Henry VIII symbolized his masculine beauty by emphasizing sexual attractiveness that cannot be seen in portraits of other kings through broad shoulders and exaggerated codpiece which are the zenith of masculine beauty during the Renaissance age. Through the image of King Henry VIII which was painted with jester or barber surgeons, his characteristic and open mind thinking highly of the technique and human life was also expressed. In the portrait of King Henry VIII, various images set in knights' tournament, playing a musical instrument and reading a book as well as the image of wearing a parliament costume were shown, highlighting King Henry VIII as a person good at both literary and martial arts with open and innovative personality than any other kings in history.

• Journal of the Korean Society of Fashion and Beauty
• /
• v.2 no.1 s.1
• /
• pp.14-20
• /
• 2004

The purpose of this Study is to provide basic data for the development of the beauty industry to meet its increased demand and liberated world markets more properly by analyzing the change of beauty environment by ages. For the Study, the literature and articles of costume and beauty, periodicals of beauty companies, and internet data were referred to review and analyze changing proceeds of beauty industries from the 1900 to the present by ages. The findings of the Study are as follows: We had the first barber shop and hairdressing salon in 1901 and 1920, respectively, after the Danbal Ryeong(A Crop Ordinance); modern education for women and active social movements resulted in change of hair styles; permanent wave tools and chemicals began to be used in the 1930s; and more people started to visit hairdressing salons after 1950s. In turn change of hair styles promoted the development of beauty technologies and the diversity of beauty tools and products. Now up-to-date instrument and products for the health of hair are developed, hairdresser provide kinder service for their customers and adjust their floor space accordingly, and, as shown in five-day workweek, are making their endeavors to improve wellbeing of their employees.

• Pediatric Gastroenterology, Hepatology & Nutrition
• /
• v.22 no.6
• /
• pp.594-600
• /
• 2019

With improving survival of children with complex congenital heart disease (CCHD), postoperative complications, like protein-losing enteropathy (PLE) are increasingly encountered. A 3-year-old girl with surgically corrected CCHD (ventricular inversion/L-transposition of the great arteries, ventricular septal defect, pulmonary atresia, postdouble switch procedure [Rastelli and Glenn]) developed chylothoraces. She was treated with pleurodesis, thoracic duct ligation and subsequently developed chylous ascites and PLE (serum albumin ${\leq}0.9g/dL$) and was malnourished, despite nutritional rehabilitation. Lymphangioscintigraphy/single-photon emission computed tomography showed lymphatic obstruction at the cisterna chyli level. A segmental chyle leak and chylous lymphangiectasia were confirmed by gastrointestinal endoscopy, magnetic resonance (MR) enterography, and MR lymphangiography. Selective glue embolization of leaking intestinal lymphatic trunks led to prompt reversal of PLE. Serum albumin level and weight gain markedly improved and have been maintained for over 3 years. Selective interventional embolization reversed this devastating lymphatic complication of surgically corrected CCHD.

• Asia-Pacific Journal of Business
• /
• v.11 no.4
• /
• pp.243-254
• /
• 2020

Purpose - This paper explores whether overnight returns measured from the last closing price to today's opening price explain the cross-section of stock returns. Design/methodology/approach - This study is conducted using the Korean stock market data from 1998 to 2018, obtained from DataGuide database. The analysis begins with portfolio-level tests, followed by firm-level cross-sectional regressions. Findings - First, when decile portfolios sorted on the daily average of overnight returns in the previous months, the highest decile portfolio exhibits a significant negative risk-adjusted return. This suggests that stocks with higher average overnight returns are temporarily overvalued due to buying pressure from investors. Second, at least 6 months of persistence exists in average overnight returns, which is in line with the results reported by Barber, Odean and Zhu (2009) that investor sentiment persists over several weeks. Finally, Fama-MacBeth cross-sectional regression of expected returns after controlling for a variety of firm characteristic variables such as firm size, book-to-market ratio, market beta, momentum, liquidity, short-term reversal, the slope coefficient for overnight returns remains negative and statistically significant. Research implications or Originality - Overall, the evidence consistently suggests that overnight return is considered as a new priced factor in the cross-section of expected returns. The findings of this paper not only adds to finance literature, but also could be useful to practitioners in making stock investment decision.

• Korean Journal of Child Studies
• /
• v.37 no.4
• /
• pp.31-46
• /
• 2016

Objective: This study examined the influences of maternal and paternal psychological control and children's rejection sensitivity on relational aggression in elementary school students, and investigated whether children's rejection sensitivity mediated the relation of parental psychological control and relational aggression. Methods: The participants of this study were 596 fifth to sixth graders from seven elementary schools located in Seoul, Incheon, and Gyeonggi province. To measure the research variables, the Peer Conflict Scale (Marsee, Kimonis, & Frick, 2004), the Psychological Control Scale (Barber, 1996) and the Children's Rejection Sensitivity Questionnaire (Downey, Lebolt, $Rinc\acute{o}n$, & Freitas, 1998) were used. The data were analyzed by means of descriptive statistics and t -tests. Also, structure equation model (SEM) were used to examine the mediating role of rejection sensitivity. Results: The results of this study were as follows. First, the level of paternal psychological control increased the level of children's relational aggression whereas the level of maternal psychological control had no significant effect on it. In addition, the level of rejection sensitivity had a significant positive influence on the level of relational aggression. These tendencies were observed on both boys and girls. Second, only for boys, rejection sensitivity in upper elementary school students partially mediated the relation between paternal psychological control and relational aggression. Also, for both boys and girls, rejection sensitivity completely mediated the relation between maternal psychological control and relational aggression. Conclusion: In conclusion, the higher the level of paternal psychological control, the higher the level of children's rejection sensitivity, and subsequently the higher the level of their relational aggression.

• The Journal of Korean Academy of Prosthodontics
• /
• v.33 no.3
• /
• pp.569-583
• /
• 1995

Disinfection of dental impressions are necessary due to contamination with patient’s saliva and blood, which is a potential for cross-infection. The purpose of this study was to evaluate the effects of disinfection of four hydrophilic rubber impression materials with three disinfecting solutions, on the dimensional stability and surface hardness of improved stone casts. Three hydrophilic vinyl polysiloxane impression materials(Express, Reprosil, Exafine) and one polyether impression material(Impregum-F) were mixed according to the manufacturer’s directions and impressions were made on a ADA specification No. 19 stainless-steeldie. On removal of the impressions, each impression was immersed in one of the disinfectants(Banicide, Potadine, Clorox) for 10 minutes. After disinfection, type IV improved stone. casts were poured. On this cast, the linear dimension and surface hardness were measuredusing a Measurescope(Nikon, Japan) and a Barcol hardness tester(Barber, Colman Co U. S. A). The results were as follows : 1. The improved stone casts from disinfected Reprosil and Impregum-F impression material did not show dimensional changes(P>0.01). Those from disinfected Express and Exafine impression material showed dimensional changes(P<0.01). The amount of shrinkage was not clinically significant. 2. The improved stone casts from disinfected Express impression material did not exhibit changes in surface hardness(P>0.01), but those from disinfected Reprosil, Exafine, Imp regnum-F impression material showed changes in surface hardness(P<0.01). 3. The dimensinal stability and surface hardness of the improved stone casts were satisfactory using Banicide on Express, all disinfectants used in this study on Reprosil, Potadin and Clorox on Exafine, Banicide and Clorox on Impregum-F. According to these results, immersion disinfection of hydrophilic rubber impression mate rials did not adversely affect the resultant casts. Nevertheless compatibility tests of impression materials and disinfectants should be done when disinfecting impressions.