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PubMed | KAIST, Pusan National University of Education and Florida State University
Type: Journal Article | Journal: Advanced materials (Deerfield Beach, Fla.) | Year: 2016

Side-chain fluorination of polymers is demonstrated as a highly effective strategy to improve the efficiency of all-polymer solar cells from 2.93% (nonfluorinated P1) to 7.13% (fluorinated P2). This significant enhancement is achieved by synergistic improvements in open-circuit voltage, charge generation, and charge transport, as fluorination of the donor polymer optimizes the band alignment and the film morphology.

PubMed | Ewha Womans University, Pusan National University of Education, Chungnam National University, Dongguk University and Pusan National University
Type: | Journal: Obesity research & clinical practice | Year: 2016

To investigate associations between degrees of obesity using correlations between obesity indices and cardiometabolic risk factors in women.BMI, waist circumference (WC), fasting insulin, fasting glucose, lipids, and visceral adipose tissue (VAT) area using computed tomographic images were measured in 113 women with obesity. Correlations between obesity indices and cardiometabolic risk factors were analyzed in subgroups defined using sequential obesity indices.Mean BMI and WC were 29.6kg/mOur cross-sectional study suggest that significant correlations between obesity indices and cardiometabolic risk factors may disappear, when obesity cut-off points exceed certain limits in women.

Lee K.C.,Pusan National University of Education | Cho J.,Jeju National University
Communications in Computer and Information Science | Year: 2012

As an advanced factor of OCB, causative variables (heterogenous, independent), such as the fairness of personnel management, the behavioral characteristics of an executive and the ethical management, are considered important in the organization management. With these having the executive trust and the organizational cynicism as a medium, the study focused on defining a relation of them, examining how they would work with the job attitude and the behaviors (organizational citizenship behavior, the job satisfaction and affective involvement), which are the causative variables (endogenous, subordinate). Through a comprehensive model, this study confirmed channels of variables which would affect the job attitude and behavior, which has led the study to suggest an empirical frame to clearly define causative variables, parameters and consequential variables. In other words, by having included general social welfare organization management-related variables, such as behavioral characteristics of an executive and ethical management, which have never been grafted onto the field of social welfare administration, the study came to have an academically significant meaning as a paper that has distributed itself to the establishment of general follow-up researches on social welfare organizations and social workers. © 2012 Springer-Verlag Berlin Heidelberg.

PubMed | Yonsei University, Catholic Kwandong University, Catholic University of Korea, Pusan National University of Education and St. Mary's College
Type: | Journal: Stem cell research & therapy | Year: 2016

Recently, cell-based therapeutic lymphangiogenesis has emerged and provided hope for lymphatic regeneration. Previous studies have demonstrated that secretomes of mesenchymal stem cells (MSCs) facilitate the regeneration of various damaged tissues. This study was conducted to evaluate the lymphangiogenic potential of hypoxic conditioned media (HCM) from MSCs.To investigate the effects of MSC-secreted factors in starved human lymphatic endothelial cells (hLEC), hLECs were treated with endothelial basal medium (EBM)-2 (control), normoxic conditioned media (NCM), or HCM in vitro and in vivo.MSCs expressed lymphangiogenic factors including EGF, FGF2, HGF, IGF-1, and VEGF-A and -C. hLECs were treated with each medium. hLEC proliferation, migration, and tube formation were improved under HCM compared with NCM. Moreover, expression of mitochondrial-related factors, MFN1and 2, were improved in HCM-treated hLECs. Lymphedema mice injected with HCM showed markedly decreased lymphedema via increased lymphatic vessel formation when compared with EBM-2- or NCM-treated mice.This study suggested that HCM from MSCs contain high levels of secreted lymphangiogenic factors and promote lymphangiogenesis by regulating mitochondrial-related factors. Thus, treatment with HCM may be a therapeutic strategy for lymphedema.

PubMed | Pusan National University of Education
Type: Journal Article | Journal: Pancreas | Year: 2016

Appetite and carbohydrate metabolism are important contributors to the development of obesity. Recently, low serum amylase was shown to be associated with obesity and metabolic disorder. We investigated the relationship between amylase and ghrelin or peptide YY (PYY) levels in healthy men.Twenty-one men were enrolled in this cross-sectional study; all subjects were asymptomatic with no medical history. Fasting serum amylase, ghrelin, PYY3-36, anthropometry, and nutritional intake were measured. Linear regression analyses were performed to examine associations between amylase and ghrelin or PYY3-36.The mean (SD) age and waist circumference of the subjects were 51.5 (10.9) years and 87.0 (4.4) cm, respectively. Amylase was found to be correlated with waist circumference (r = -0.438, P = 0.054), ghrelin (r = 0.533, P = 0.015), and PYY3-36 (r = -0.511, P = 0.021). Multivariate linear regression analysis revealed a negative association between amylase and PYY3-36 ( = -0.428, P = 0.045) but a nonsignificantly positive association between amylase and ghrelin ( = 0.260, P = 0.146).Amylase levels were found to be associated with ghrelin and PYY3-36 in healthy men. Amylase, ghrelin, and PYY3-36 may play a role in obesity; further research is required to identify the underlying mechanism.

PubMed | Pusan National University of Education and Pusan National University
Type: Journal Article | Journal: Patient education and counseling | Year: 2016

to investigate the effectiveness of the Micro Expression Training Tool (METT) and the Subtle Expression Training Tool (SETT) to help improve the non-verbal communication skills of medical students.In a randomized controlled trial, all participants were randomly allocated to either a training (n=41) or control group (n=41) and were pre-tested before education with METT and SETT at baseline. Then, training students took second tests after a 1-h class about interpreting micro and subtle expressions and control students took the second tests without the class.METT pre-test scores were positively related with female gender, agreeableness, whereas SETT pre-test scores were negatively related with age and positively related with female gender. Mean METT score increases of 29.3% and mean SETT score increases of 36.2% were observed after training, whereas the control group achieved only a mean METT score increase of 11.0% at second testing. Increases in both test scores in the training group were significantly higher than in the control group.METT and SETT are effective, simple tools for improving the micro- and subtle-expression reading skills of medical students.METT and SETT can be effective for improving the non-verbal communication skills of medical students.

PubMed | Pusan National University of Education and Pusan National University
Type: | Journal: Evidence-based complementary and alternative medicine : eCAM | Year: 2016

Ursolic acid (UA) is the major active component of the loquat leaf extract (LLE) and several previous studies have indicated that UA may have the ability to prevent skeletal muscle atrophy. Therefore, we conducted a randomized, double-blind, and placebo-controlled study to investigate the effects of the LLE on muscle strength, muscle mass, muscle function, and metabolic markers in healthy adults; the safety of the compound was also evaluated. We examined the peak torque/body weight at 60/s knee extension, handgrip strength, skeletal muscle mass, physical performance, and metabolic parameters at baseline, as well as after 4 and 12 weeks of intervention. Either 500mg of LLE (50.94mg of UA) or a placebo was administered to fifty-four healthy adults each day for 12 weeks; no differences in muscle strength, muscle mass, and physical performance were observed between the two groups. However, the right-handgrip strength of female subjects in the LLE group was found to be significantly better than that of subjects in the control group (

PubMed | Pusan National University of Education and Pusan National University
Type: | Journal: Clinical hypertension | Year: 2016

Hypertension is a significant risk factor for cardiovascular disease (CVD). The majority of patients, however, cannot easily maintain a healthy blood pressure. Therefore, lifestyle modifications are important and may include getting enough sleep. The purpose of this study was to determine the relationship between sleep duration and hypertension, as defined by the Joint National Committee (JNC) 7 and JNC 8 guidelines.We used the data from 6,365 individuals aged18years based on national data from a representative sample of the 5(th) Korea National Health and Nutrition Examination Survey V-3 in 2012. The participants were divided into three categories: JNC 7, JNC 8, and newly excluded only. The duration of sleep was classified as less than 5, 6, 7, 8, or more than 9hours.Compared with the appropriate sleep duration of 7hours, with a sleep duration of less than 5hours, the recommended pharmacological treatment of hypertension rate increased 1.908-fold (95% CI=1.483-2.456) according to the JNC 8 guidelines and 1.864-fold (95% CI=1.446-2.403) according to the JNC 7 guidelines. However, there was no statistical difference with the other sleep categories.The recommended hypertension treatment rate increased significantly in the less than 5hours sleep group according to the JNC 8 guidelines. To manage hypertension effectively, it may be useful to maintain a lifestyle of sleeping more than 6hours.

PubMed | Pusan National University of Education and Pusan National University
Type: Journal Article | Journal: Korean journal of family medicine | Year: 2016

Vitamin-mineral supplements are the most popular dietary supplements in Korea. However, few studies have assessed the relationship between vitamin-mineral supplementation and associated factors among the Korean elderly. The purpose of this study was to assess the use of vitamin-mineral supplements among elderly in Korea as well as its association with sociodemographic factors, health-related behaviors, medical conditions, and nutrient intake.This study was based on data from the Korean National Health and Nutrition Examination Survey, conducted by the Korean Ministry of Health and Welfare from 2008 to 2009. Data from 3,294 elderly men and women (65 years of age and older) were analyzed. Multivariable-weighted logistic regression model analysis was used to evaluate the association between vitamin-mineral supplement use and sociodemographic factors, health-related habits, and medical conditions.Vitamin-mineral supplementation was reported by 16.3% of the participants. The most common reason for using dietary supplements was recommendations from friends and acquaintances. Highly educated person, female participants had a greater likelihood of taking vitamin-mineral supplements. In addition, analysis of nutrient intake from food sources alone revealed a lower proportion of vitamin-mineral supplement users with nutrient intakes below the estimated average requirements for vitamin A, vitamin C, thiamine, riboflavin, niacin, calcium, iron, and phosphorus, compared to nonusers. However, vitamin-mineral supplementation was not associated with health-related behaviors or medical conditions.Highly educated person, elderly Korean women had a greater likelihood of using vitamin-mineral supplements. In addition, nutrient intakes from food sources alone were significantly higher among vitamin-mineral supplement users. Finally, vitamin-mineral supplementation may be an indicator of healthier diet in elderly Koreans.

PubMed | Pusan National University of Education
Type: Journal Article | Journal: Chemistry, an Asian journal | Year: 2016

Deep-blue fluorescent emitters with Commission Internationale de lEclairage (CIE) y0.06 are urgently needed for high-density storage, full-color displays and solid-state lighting. However, developing such emitters with high color purity and efficiency in solution-processable non-doped organic light-emitting diodes (OLEDs) remains an important challenge. Here, we present the synthesis of two new deep-blue fluorescent emitters (AFpTPI and AFmTPI) based on 10-(9,9-diethyl-9H-fluoren-2-yl)-9,9-dimethyl-9,10-dihydroacridine as a core and 1,3- and/or 1,4-phenylene-linked triphenylimidazole (TPI) analogues for non-doped solution-processable OLEDs. Their thermal, photophysical, electrochemical, and device characteristics are explored, and also strongly supported by density functional theory (DFT) study. AFpTPI and AFmTPI exhibit excellent thermal stability (450C) with high glass transition temperatures (T

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