• KOREAN JOURNAL OF CROP SCIENCE
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• v.51 no.2
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• pp.163-168
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• 2006

Improvement of crop yield can be achieved through understanding genetic variation in reproductive characters and its impact on yield components. The present study was performed to evaluate genetic diversity for reproductive growth characters in exotic germplasm resources and to determine the relationships between developmental and growth periods with yield and yield components in soybean cultivar groups. For phenotypic evaluation such as reproductive and agronomic traits, a total of 80 indigenous and exotic soybean cultivars collected from four different geographical regions (China, Japan, Korea, and Vietnam) were grown from May to November of 2003 at the Seoul National University Farm, Suwon, Korea ($127^{\circ}02'E$ longitude, $37^{\circ}26'N$ latitude). Most of all the characters exhibited wide range of phenotypic variation, of which pod number, seed number, and plant yield showed greater range as compared to other characters. Korean cultivar groups showed greater diversity than the other cultivar groups in seven characters. Correlation analysis showed that days to flowering (DTF) and days to maturity (DTM) had close association with agronomic traits as well as yield and yield components. Both DTF and DTM had positive correlation with the other characters except one hundred seed weight. Stepwise multiple linear regression revealed that seed and pod number were identified as being significant for plant yield. The results in this study indicated wide variation in agronomic traits including DTF and DTM, suggesting the valuable genetic resources in a soybean breeding program.

• Journal of Korean society of Dental Hygiene
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• v.12 no.6
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• pp.1203-1211
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• 2012

Objectives : The aim of this study was to investigate the factor-related oral care self-efficacy among the type 2 diabetic patients. Methods : Questionnaire was conducted with 174 Type 2 diabetic patients from 9th January to 9th March in 2012. The following conclusion was obtained as a result of carrying out t-test and one-way ANOVA analysis and multiple linear regression analysis. Results : 1. Analysis of the level of each item concerning oral care self-efficacy showed tooth brushing self-efficacy was $13.3{\pm}2.9$, the highest of all. 2. The factor that was most highly related with oral care self-efficacy was oral health behaviors(${\beta}=0.474$). The other factors were found to be expected duration of diabetes(${\beta}=-0.205$), self-assessed physical health(${\beta}=0.177$) and oral health(${\beta}=0.111$) in such order (p<0.05). Conclusions : Diabetes causes a variety of complications in the mouth, and therefore it is very important to practice oral care activity in order to oral health promotion. This study showed oral care self-efficacy appeared to be the greatest factor of relevance in practicing oral care activity. So, dental hygienist is obliged to keep on motivating so that the patient may maintain the oral care activity for him/herself. Also, a study on various intervention methods to improve oral care self-efficacy should be continued.

• Journal of Korean society of Dental Hygiene
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• v.16 no.3
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• pp.435-446
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• 2016

Objectives: The purpose of the this study is to investigate parenting stress of married dental hygienists having preschool and school aged children. Methods: A self-reported questionnaire was completed by 242 married dental hygienists from September to December, 2015 via e-mail and ordinary mail. The questionnaire consisted of demographics, job-related characteristics, family life satisfaction, and parenting stress. The data were analyzed using Stata 13.0 program. Results: As for job-related characteristics, 36.6% of the subjects answered 'not possible' in work hour flexibility. The reasons why family-work balance is difficult were 'parenting and education(58.7%)' and 'burden of family-work balance(32.4%)'. Family life satisfaction was 3.03, and parenting stress was 2.41. Parenting stress gets higher if their children are younger, monthly income is lower, and mother/father's age are lower. And parenting stress becomes higher if their career as dental hygienists is less, they are contract worker, and frequency to change jobs is higher. Concerning the reason why work-family balance is difficult, parenting stress is found to be high when they choose 'parenting and education', 'burdens of work-family balance', and 'relationship in workplace'. Family life satisfaction reduced parenting stress. According to the results of multiple linear regression analysis, frequency to change job influences parenting stress. Conclusions: Parenting stress increases turnover and career interruption of married dental hygienists. It is hard to improve work environment without policy support. It will be necessary to establish policy for employed mothers and create a work atmosphere where the policy can be utilized without difficulty.

• Structural Engineering and Mechanics
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• v.74 no.6
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• pp.821-832
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• 2020

The fundamental period is an important parameter for seismic design and seismic risk assessment of building structures. In this paper, a simplified theoretical method to predict the fundamental period of masonry infilled reinforced concrete (RC) frame is developed based on the basic theory of engineering mechanics. The different configurations of the RC frame as well as masonry walls were taken into account in the developed method. The fundamental period of the infilled structure is calculated according to the integration of the lateral stiffness of the RC frame and masonry walls along the height. A correction coefficient is considered to control the error for the period estimation, and it is determined according to the multiple linear regression analysis. The corrected formula is verified by shaking table tests on two masonry infilled RC frame models, and the errors between the estimated and test period are 2.3% and 23.2%. Finally, a probability-based method is proposed for the corrected formula, and it allows the structural engineers to select an appropriate fundamental period with a certain safety redundancy. The proposed method can be quickly and flexibly used for prediction, and it can be hand-calculated and easily understood. Thus it would be a good choice in determining the fundamental period of RC frames infilled with masonry wall structures in engineering practice instead of the existing methods.

• The Journal of the Korea Contents Association
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• v.13 no.6
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• pp.300-308
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• 2013

The purpose of this study was to explore the level of anger and social support and to identify factors affecting anger in elderly women. This was a cross-sectional descriptive survey. A convenience sample of 155 elderly women was recruited from two senior welfare centers and three nursing homes in J city. Data were collected from June 15 to July 15, 2010 through interviews using a structured questionnaire. Data were analyzed with descriptive statistics, independent t-test, one-way ANOVA, Pearson's correlation coefficient, and multiple linear regression using the SPSS WIN 18.0 program. The level of social support and anger was 3.73 and 2.72 out of 5, respectively. Anger was statistically significantly different according to type of residence (B=0.21, t=2.42, ${\rho}$=.017), psychiatric medication (B=0.66, t=4.93, ${\rho}$ <.001), physical medication (B=0.41, t=4.22, ${\rho}$ <.001), and evaluation support (B=-0.15, t=-3.00, ${\rho}$=.004), and these accounted 33.0% of anger. Providing proper information and developing social support program would be useful for managing anger of elderly women.

• Clinical and Experimental Reproductive Medicine
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• v.39 no.4
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• pp.161-165
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• 2012

Objective: To evaluate the effect of hysterosalpingo-contrast sonography (HyCoSy) on natural conception in the infertile patient. Methods: We conducted a prospective observational study recruiting 180 patients admitted to Infertility Center of Ferrara University from January 2010 to February 2012. The essential inclusion criteria was the couple's desire to perform only diagnostic evaluation on infertility causes and to wait for natural conception before proceeding with further management. Couples were investigated with hormonal profile, semen analysis and HyCoSy. Expected time for spontaneous pregnancy was 180 days from HyCoSy. First datation sonography of pregnancy was used calculating time elapsed from HyCoSy at conception. Results: Forty patients (22.2%) obtained spontaneous pregnancy within 6 months after HyCoSy. The mean of "conception time" was 75 days. The pregnancy rate was significantly higher in the first 30 days (45%) compared to other the months of observation (p<0.0005). Multiple linear regression analysis showed that maternal age and sterility duration proved independent variables in detecting the "conception time" after HyCoSy (t=3.742, p=0.001, t=2.371, p=0.02, respectively). Conclusion: A possible beneficial effect of HyCoSy is feasible especially in the days following its execution. This temporal correlation supports its therapeutic use.

• Journal of Korean Society for Atmospheric Environment
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• v.24 no.4
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• pp.415-422
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• 2008

This study was carried out to investigate the effect of operating and design conditions of gas dispersion type of absorber on $SO_2$ removal efficiency. pH difference between upper and lower part of gas dispersing plate of absorber was 0.2, which was relatively low. This was supposed that recirculation capacity of absorbing liquid between froth zone and reaction zone of absorber be increased by oxidation air injection through liquid riser which acted as liquid pump. Test results showed that $SO_2$ removal efficiency was more sensitive than absorber ${\Delta}P$. High $SO_2$ removal even at lower pH resulted from very low concentration of $HSO_3^-$ ion in absorbing liquid because of direct supply of dissolved oxygen into froth zone. 96% of $SO_2$ removal efficiency was obtained under the condition of absorber pH 5.2, flue gas flow rate of $1,530\;Nm^3/hr$, inlet $SO_2$ concentration of 800 ppm, absorber ${\Delta}P$ of 250mmAq. The following equation by a multiple linear regression was obtained to describe the relationship between $SO_2$ removal and operating variables. $$f=1-{\exp}(-1.3939+1.060pH+0.0139{\Delta}P-0.00267G-0.000064SO_2Conc.),\;R^2=0.9719$$

• Journal of the Korea Academia-Industrial cooperation Society
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• v.15 no.6
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• pp.3675-3684
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• 2014

This study examined the relationships among body perception, anxiety, psychological flexibility, and abnormal eating habits of college students. Data was collected through a self reported structured questionnaire from 289 Korean college students using convenient sampling methods from April 20 to June 30, 2013. Multiple linear regression revealed the subjective body perception (${\beta}$=0.28, p<.001), ideal body image (${\beta}$=-0.15, p=.004), anxiety (${\beta}$=0.21, p<.001), and psychological flexibility (${\beta}$=-0.13, p=.032) to be significant predictors of abnormal eating habits of college students. These variables accounted for 26% of abnormal eating habits (F=17.42, p<.001). Therefore, as a strategy for reducing abnormal eating habits, therapeutic nursing intervention will be needed to improve the psychological flexibility and control anxiety as well as correct the distorted body perception.

• Nutrition Research and Practice
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• v.5 no.5
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• pp.450-454
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• 2011

The beneficial effects of total parenteral nutrition (TPN) in improving the nutritional status of malnourished patients during hospital stays have been well established. However, recent randomized trials and meta-analyses have reported an increased rate of TPN-associated complications and mortality in critically ill patients. The increased risk of complications during TPN therapy has been linked to the development of hyperglycemia, especially during the first few days of TPN therapy. This retrospective study was conducted to determine whether the amount of dextrose from TPN in the 1st week in the intensive care unit (ICU) was related to the development of hyperglycemia and the clinical outcome. We included 88 non-diabetic critically ill patients who stayed in the medical ICU for more than two days. The subjects were 65 ${\pm}$ 16 years old, and the mean APACHE (Acute Physiology and Chronic Health Evaluation) II score upon admission was 20.9${\pm}$7.1. The subjects received 2.3${\pm}$1.4 g/kg/day of dextrose intravenously. We divided the subjects into two groups according to the mean blood glucose (BG) level during the 1st week of ICU stay: <140 mg/dl vs ${\geq}$ 140 mg/dl. Baseline BG and the amount of dextrose delivered via TPN were significantly higher in the hyperglycemia group than those in the normoglycemia group. Mortality was higher in the hyperglycemia group than in the normoglycemia group (42.4% vs 12.8%, P=0.008). The amount of dextrose from TPN was the only significant variable in the multiple linear regression analysis, which included age, APACHE II score, baseline blood glucose concentration and dextrose delivery via TPN as independent variables. We concluded that the amount of dextrose delivered via TPN might be associated with the development of hyperglycemia in critically ill patients without a history of diabetes mellitus. The amount of dextrose in TPN should be decided and adapted carefully to maintain blood glucose within the target range.

• Nutrition Research and Practice
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• v.6 no.2
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• pp.120-125
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• 2012

The aim of this study was to investigate the influencing factors that characterize low density lipoprotein (LDL) phenotype and the levels of LDL particle size in healthy Korean women. In 57 healthy Korean women (mean age, $57.4{\pm}13.1$ yrs), anthropometric and biochemical parameters such as lipid profiles and LDL particle size were measured. Dietary intake was estimated by a developed semi-quantitative food frequency questionnaire. The study subjects were divided into two groups: LDL phenotype A (mean size: $269.7{\AA}$, n = 44) and LDL phenotype B (mean size: $248.2{\AA}$, n = 13). Basic characteristics were not significantly different between the two groups. The phenotype B group had a higher body mass index, higher serum levels of triglyceride, total-cholesterol, LDL-cholesterol, apolipoprotein (apo)B, and apoCIII but lower levels of high density lipoprotein (HDL)-cholesterol and LDL particle size than those of the phenotype A group. LDL particle size was negatively correlated with serum levels of triglyceride (r = -0.732, $P$ < 0.001), total-cholesterol, apoB, and apoCIII, as well as carbohydrate intake (%En) and positively correlated with serum levels of HDL-cholesterol and ApoA1 and fat intake (%En). A stepwise multiple linear regression analysis revealed that carbohydrate intake (%En) and serum triglyceride levels were the primary factors influencing LDL particle size ($P$ < 0.001, $R^2$ = 0.577). This result confirmed that LDL particle size was closely correlated with circulating triglycerides and demonstrated that particle size is significantly associated with dietary carbohydrate in Korean women.