• Bulletin of the Korean Chemical Society
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• 제34권4호
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• pp.1081-1088
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• 2013

Two new metal-free organic dyes bridged by anthracene-mediated ${\pi}$-conjugated moieties were successfully synthesized for use in a dye-sensitized solar cell (DSSC). A N,N-diphenylthiophen-2-amine unit in these dyes acts as an electron donor, while a (E)-2-cyano-3-(thiophen-2-yl)acrylic acid group acts as an electron acceptor and an anchoring group to the $TiO_2$ electrode. The photovoltaic properties of (E)-2-cyano-3-(5-((10-(5-(diphenylamino)thiophen-2-yl)anthracen-9-yl)ethynyl)thiophen-2-yl)acrylic acid (DPATAT) and (E)-2-cyano-3-(5'-((10-(5-(diphenylamino)thiophen-2-yl)anthracen-9-yl)ethynyl)-2,2'-bithiophen-5-yl)acrylic acid (DPATABT) were investigated to identify the effect of conjugation length between electron donor and acceptor on the DSSC performance. By introducing an anthracene moiety into the dye structure, together with a triple bond and thiophene moieties for fine-tuning of molecular configurations and for broadening the absorption spectra, the short-circuit photocurrent densities ($J_{sc}$), and open-circuit photovoltages ($V_{oc}$) of DSSCs were improved. The improvement of $J_{sc}$ in DSSC made of DPATABT might be attributed to much broader absorption spectrum and higher molecular extinction coefficient (${\varepsilon}$) in the visible wavelength range. The DPATABT-based DSSC showed the highest power conversion efficiency (PCE) of 3.34% (${\eta}_{max}$ = 3.70%) under AM 1.5 illumination ($100mWcm^{-2}$) in a photoactive area of $0.41cm^2$, with the $J_{sc}$ of $7.89mAcm^{-2}$, the $V_{oc}$ of 0.59 V, and the fill factor (FF) of 72%. In brief, the solar cell performance with DPATABT was found to be better than that of DPATAT-based DSSC.

• 한국언론정보학보
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• 제83권
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• pp.157-185
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• 2017

이 연구는 한국사회 비정규직 청년 노동자들과 디지털 미디어기술이 '알바'노동 현장에서 결합되는 방식에 대한 관찰 연구에 해당한다. 이제까지 테크노미디어가 청년의 문화적 재기발랄함을 발산하거나 구조로부터 탈주하는 문화적 유희 수단이기도 했지만, 이 글은 미디어기술이 청년의 온라인 잉여력의 수취나 감정노동의 강화를 위한 스마트 '유리감옥'으로 크게 탈바꿈 중임을 살핀다. 즉 청년 노동, 특히 '알바'노동에 있어서 스마트폰 등 모바일미디어의 매개적 역할에 대한 관찰을 통해서, 노동과 활동, 놀이와 노동, 물질계와 비물질계, 오프라인과 온라인 등의 경계들이 해체되고 어떻게 이것들이 시장의 가치로 거칠게 통합되고 있는가를 살펴보고 있다. 무엇보다 이 연구는 청년 알바노동의 중요한 일상이자 부분이 되어가는, 스마트폰을 손에 쥔 청년들의 노동 현장 속 '모바일노동'의 새로운 양상을 주목한다. 본 연구는 대도시 알바 현장에 대한 기초설문, 포커스 그룹 인터뷰, 참여관찰을 통해서, 일상이 된 스마트폰 등 모바일 기기 이용과 국내 청년알바 노동현장 상황이 맞물리면서 형성되는 독특한 국내 모바일노동 현실을 다층적으로 관찰한다. 이를 통해 동시대 청년 알바노동의 성격이 어떻게 억압적이지만 내면화된 방식으로 재구조화하고 있는지를 구체화한다. 즉 오늘 청년 알바노동의 현실에는 비정규 노동의 체제적 불안정성에 더해서, 모바일 테크놀로지에 의지한 일상 권력의 비공식적 노동 관리와 통제 문화가 청년의 몸에 깊숙이 아로새겨진다고 파악한다.

• Journal of Magnetics
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• 제21권3호
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• pp.460-467
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• 2016

Magnetic hyperthermia mediated by superparamagnetic particles is mainly based in sinusoidal waveforms as excitation signals. Temperature changes are conventionally explained by rotation of the particles in the surrounding medium. This is a hypothesis quite questionable since habitual experimental setups only produce changes in the magnetic module, not in the field lines trajectories. Theoretical results were tested by changing the waveform of the exciting signal in order to compare non-sinusoidal signals against sinusoidal signals. Experiments were done at different frequencies: 200 KHz, 400 KHz, 600 KHz, 800 KHz and 1 MHz. Superparamagnetic Iron Oxide samples (SPION), made of magnetite ($Fe_3O_4$) and suspended in water (100 mg/ml), were used. Magnetic field strength varies from $0.1{\pm}0.015KA/m$ to $0.6{\pm}0.015KA/m$. In this study was observed that the power loss depends on the applied frequency: for 1 to 2.5 RMS current the responses for each signal are part of the higher section of the exponential function, and for 3.5 to 8 RMS current the response is clearly the decrement exponential function's tale (under $1{\times}10^3LER/gr$).

• 한국의류학회지
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• 제39권4호
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• pp.625-639
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• 2015

The number of Chinese tourists visiting Korea has rapidly increased over the last decade. It is important to understand Chinese consumption patterns and shopping behavior because they have become major customers in the Korean fashion market. This study focuses on how Chinese tourists feel while shopping in Korea and how emotions influence their attitude towards purchased products. We examine how planned purchase and unplanned purchase impact shopping emotions and product usage satisfaction. A survey was conducted on 550 women between 20 and 60 years of age who have visited Seoul more than once with an online panel from an international survey firm. Data are analyzed using structural equation modeling by AMOS 20.0. Respondents were asked to recall most impressive fashion product that they bought in Korea during their recent visit and to answer if it was a planned or unplanned purchase. This study also measures emotions during product purchases and usage satisfaction. The respondents are categorized into heavy and light buyers according to purchasing power to determine the moderating effects of purchase amount. The results indicate that planned purchases tend to deliver positive emotions that enhance product usage satisfaction. In the case of unplanned purchases, without the mediating role of positive shopping emotions, it has a negative impact on product attitude and shows the importance of positive emotions during shopping. The influence of unplanned purchases on shopping emotions or product attitude in light buyers is not significant for the moderating effect of purchasing power. Only planned purchases trigger product usage satisfaction when it is mediated by positive emotions.

• Advances in Traditional Medicine
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• 제10권4호
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• pp.310-318
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• 2010

Verbena officinalis (Verbenaceae) has been used as herbal medicine or health supplement in both Western and Eastern countries for centuries. In the present study, we examined the anti-inflammatory and antioxidant activities of the methylene chloride fraction of V. officinalis (VMC). To elucidate the anti-inflammatory properties of VMC, we investigated the inhibition effects of nitric oxide production in interferon-gamma (IFN-$\gamma$) and lipopolysaccharide-stimulated mouse peritoneal macrophages. VMC suppressed nitric oxide production, inducible nitric oxide synthase and cyclooxygenase-2 expression dose-dependently without notable cytotoxicity. In various radical scavenging assays, VMC exhibited strong scavenging effect on DPPH radical, superoxide radical, nitric oxide radical and 2,2'-azino-bis(3-ethylbenzthiazoline-6-sulphonic acid) radical. VMC also showed potent reducing power. These findings strongly suggest that VMC may be beneficial in oxidative stress-mediated inflammatory disorders.

• Child Health Nursing Research
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• 제24권1호
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• pp.9-17
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• 2018

Purpose: The purpose of this descriptive survey study was to characterize the relationship between clinical decision-making and job satisfaction among pediatric nurses and to elucidate the mediating effects of the nurse-parent partnership on that relationship. Methods: The subjects of the study were 174 nurses who had worked in a pediatric ward in a university hospital, general hospital, or children's hospital. Data were collected from June 20, 2016 to August 10, 2016 and analysed using descriptive statistics, the t-test, analysis of variance, the Pearson correlation coefficient, and three-step mediated regression analysis in SPSS version 22.0 for Windows. Results: The nurse-parent partnership had significant effects on clinical decision-making and job satisfaction, with an explanatory power of 19% and 26%, respectively. The nurse-parent partnership had a partial mediating effect on the relationship between clinical decision-making and job satisfaction (Sobel test: Z=4.31, p<.001). Conclusion: The nurse-parent partnership had a partial mediating effect on the relationship between clinical decision-making and job satisfaction among pediatric nurses. Therefore, in order to improve the job satisfaction of pediatric nurses, it is necessary to develop effective educational programs and strategies to address their clinical decision-making and their experiences of the nurse-parent partnership.

• 가정과삶의질연구
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• 제24권4호
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• pp.93-101
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• 2006

This study explored the differences in fathers' involvement in child-rearing according to various family socio-demographic variables (fathers education level, income, mothers employment, preschooler's sex and age) and preschoolers' temperaments and examined the relationship between fathers' involvement in child-rearing and these independent variables (as well as preschooler's temperament). The subjects of the study were 227 fathers whose children were preschoolers between the ages of 3 and 5 attending daycare centers in Keoungbok province, South Korea. Statistical analysis was conducted with the following techniques: two-way ANOVA, interaction effect, Scheffe' test, Pearson's correlation partial correlation, and hierarchical multiple regression (using SPSS 12.0). Results of the study may be summarized as follows. (1) There was a significant difference in fathers' child-rearing involvement according to the fathers' education level, income, and preschoolers' temperaments. (2) There was a significant interaction effect of mothers' employment and preschoolers' temperaments on fathers' child-rearing involvement. (3) Hierarchical multiple regression analysis showed that fathers' education mediated the relationship between income and fathers' involvement in child-rearing, and fathers' education and preschoolers' temperaments was also found to have predictive power over fathers' child-rearing involvement.

• 영어어문교육
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• 제11권2호
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• pp.171-194
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• 2005

The essay attempts at a critical reading of Thomas Hardy's The Mayor of Casterbridge (1886) in terms of character and socio-cultural change. Juxtaposing the story of Michael Henchard's career with the social and economic changes in the agricultural town, it attempts to elaborate on the complex ways in which Hardy relates the old modes of life and thinking to the material culture. Though the novel is centered on the story of Henchard, the Henchard-Farfrae clash represents the conflict of "old" and "new" modes of socio-economic organization and consciousness. The story of the rustic man of character struggling with his contradictory traits of strong will-power and emotional collapse suggests that Hardy's literary representation of the rural community and the rustic protagonist is deeply rooted in historical reality. However, while there is the interlocking of the changes in personal fate and social change, the representation is a "reinvented" literary construction with complex mediation. Despite the narrator's emphasis on Henchard's immutability, peculiarity, and resilience, his character is, in a complex, mediated way, shaped by the material conditions of English rural community in the late 19th century. The mediating role of Elizabeth-Jane as a narrative resolution embodies Hardy's ambivalent historical position concerning the period undergoing change and conflict.

• 한국보육지원학회지
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• 제17권2호
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• pp.47-68
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• 2021

Objective: This study investigated direct and indirect influences of fathers' parenting involvement on maternal parenting competence by exploring pathways between fathers' parenting involvement, maternal inner strength, and maternal parenting competence. Methods: A total of 329 mothers with 3-year-old children responded to online survey questionnaires, which included questions about fathers' parenting involvement, maternal inner strength, and maternal parenting competence. The data was analyzed by Pearson's correlation coefficients and Structural Equation Modeling. Results: It was observed that maternal inner strength perfectly mediated the association between father's parenting involvement and maternal parenting competence. More concretely, a direct effect of fathers' parenting involvement on maternal parenting competence was not found. It was also found that fathers' parenting involvement effects maternal parenting competence indirectly. The effect of fathers' parenting involvement on maternal inner strength was the greatest among all associations between fathers' parenting involvement, maternal inner strength, and maternal parenting competence. Conclusion/Implications: These findings have insights for research and practice, which emphasize the important considerations that enhancing maternal inner strength and the power of fathers' parenting involvement on maternal inner strength should be emphasized in order to improve maternal parenting competence.

• 한국가족관계학회지
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• 제22권2호
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• pp.27-50
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• 2017

Objectives: This study explored the effect of adolescents' sociodemographic variables, parenting rearing styles, resilience, and life satisfaction on adolescents' depression. The resilience as mediating effects of parental rearing styles and life satisfaction on depression was examined as well. Method: The data were from 2,108 middle school freshmen panel of a national sample at the forth year, Korea Children and Youth Panel Survey(KCYPS). Hierarchical multiple regressions and mediation regression analyses, steps for testing mediation by Baron and Kenny, were conducted. Results: Adolescents' resilience had both direct and mediating significant effects, showing that resilience partially mediated the effects of affective parental rearing style and life satisfaction on depression, respectively. Life satisfaction had the most significant impact on adolescents' depression. Conclusions: While some parental rearing styles were significant, adolescents' personal properties including resilience and life satisfaction revealed the most significant explanatory power of adolescents' depression. Life satisfaction was the most powerful predictor for lessening adolescents' depression.