Determining the Predictors of Postpartum Depression in Vietnamese Women: Mediating Effect of Maternal Role Strain

NGUYEN THI PHUONG THAO Garduate school, Inje university, Korea 2021 국내박사

Postpartum depression is a significant public health issue which has not only negative effects on maternal postpartum health but also on family relationship and infant growth and development. In Vietnam, postpartum depression is not usually cared in the community as well as in the health care system because it is insufficiently screened or diagnosed and followed up during the postpartum period. Moreover, there is very little research analyzing, predicting factors of postpartum depression. Especially there is less study of the mediating effects of maternal role strain among self-efficacy, social support, infant temperament, and postpartum depression in Vietnam. Moreover, the support of the theoretical model in which self-efficacy, social support, and infant temperament were linked to postpartum depression symptoms through their effects on maternal role strain is important both contribute to conceptual understanding of these processes and to seek effective interventions for postpartum depression in Vietnamese women. Thus, the purposes of this study are to identify the predictors for postpartum depression and determine the mediating effects of the maternal role strain on the relationship among the degree of self-efficacy, infant temperament, social support, and postpartum depression. Methods: The focus of correlational descriptive research design was performed on 190 mothers who were the first birth from four weeks to six months and be enrolled to give vaccination in 12 community health centers of Hue city in Vietnam. Data gathering tools included the “Perceived Self-Efficacy Scale”, “Maternal Social Support Scale”, “Difficult Infant Temperament Scale”, “Maternal Role Strain Scale”, and “Edinburgh Postnatal Depression Scale (EPDS)”. Data analysis was done by using the SPSS software, which was based on descriptive statistics and statistical independent t-test or one-way ANOVA test, mediation. These were tested by a series of multiple regressions by using Baron and Kenny methods. The Sobel test was used to test the significance of the mediating effects. Results: The prevalence of probable postpartum depression which had the EPDS score at or greater cut-off of 13 points was 18.9%. There were a significant differences between postpartum depression and mother’s occupation (t=-2.86, p=.005), relationship with her husband (F=5.91, p=.003), stressful life events (t=2.94, p=.004), paid maternity leave (F=6.83, p=.001), and gestational age (t=3.32, p=.001), history of mental health (t=3.86, p<.001), self-efficacy (r=-.15, p=.030), and social support (r=-.38, p<.001), infant temperament (r=.40, p<.001), and maternal role strain (r=.59, p<.001). Furthermore, there was identified paid maternity leave (β=-.16, p=.004), gestational age (β=.15, p=.005), history of mental health (β=-.19, p=.002), self-efficacy (β=.12, p=.031), and the maternal role strain (β=.47, p<.001) as the prediction of postpartum depression. The regression model with significant predictors explains 46% of the variance. As the mediating effects, maternal role strain had a full mediating effect on the relationship between self-efficacy and postpartum depression. Besides, maternal role strain was also a partial mediating effect on the relationship between maternal social support, infant temperament and postpartum depression among postpartum women. Conclusion: The findings of this study contribute to nursing science by identifying the mediating effects of maternal role strain on postpartum depression in Vietnam. Future research suggests solutions for professional experts of community mental health to develop effective intervention strategies which aims at the reduction of maternal role strain to decrease the impact of self-efficacy, social support, infant temperament on postpartum depression.

Effects of consumer perception of CSR activities and technology acceptance on intention to adopt mobile banking : evidence in Vietnam

Thao, Nguyen Thi Phuong 한양대학교 대학원 2017 국내박사

Effects of consumer perception of CSR activities and technology acceptance on intention to adopt mobile banking : evidence in Vietnam

Nguyen, Thi Phuong Thao Hanyang University 2017 국내박사

The purpose of this paper is to propose and examine a conceptual model that best explains the key factors influencing Vietnamese customers' intention to adopt mobile banking (m-banking). The proposed conceptual model was based on the Technology Acceptance Model (TAM). This was extended by adding perceived risk, perceived cost and trust as external factors. In addition, the conceptual model was extended by adding three dimensions of CSR including Economic responsibility, Environmental responsibility and Social responsibility as the antecedents of trust. Structural Equation Modeling (SEM) was conducted to analyze the data collected from the field survey questionnaires administered to a convenience sample of Vietnamese banking customers. The results showed that behavioral intention is significantly influenced by perceived usefulness, perceived ease of use, perceived risk and trust. Specially, CSR initiatives play a vital role in building customer’s trust. Therefore, this study has attempted to fill this gap by empirically examining some of the important factors influencing the adoption of m-banking from the Vietnamese customers’ perspective. Finally, practical and theoretical implications for both Vietnamese banks and researchers in the m-banking context are also discussed in the concluding section.

온라인 브랜드커뮤니티에의 소비자 참여가 행동의도에 미치는 영향

Nguyen Thi Phuong Thao The graduate school of Business Administration, un 2013 국내석사

The online brand community has become a powerful tool giving insights into consumer needs and behavioral intentions. This study explores how online brand communities affect consumer behavioral intentions through consumer participation in an online brand community and what motivates consumers to take part in the community activities. This is a survey-based study, conducted with 213 community members and employing structural equation modeling methodology. SPSS 20 and AMOS 20 are used to test the hypotheses. The findings suggest that members of brand communities have these motives for participating in online community activities: trust, perceived functional benefits, social benefits, perceived costs (indirectly via consumer attitude towards participation in the community), and time pressure. The results also verify that the consumer participation affects consumer behavioral intentions in a way that benefits the brand-holding firm. Participation increases the intention to purchase, the intention to create positive word-of-mouth and the intention to make constructive suggestions, and reduces the propensity to leave the relationship with the brand community. Based on the findings, the author also gives some implications of the study and directions for future research.

MOMENTUM AND CONTRARIAN STRATEGIES EVIDENCE IN VIETNAM STOCK MARKET : 베트남 주식시장의 계속투자전략 및 반전투자전략의 성과

THAO, NGUYEN THI PHUONG 안동대학교 대학원 2009 국내석사

The past return-based investment strategies have been employed for many decades ago by many practitioners and scholars, such as contrarian and momentum strategies so these strategies have been investigated extensively by academics and scholars all over the world in recent years. They showed that average stock returns are concerned to past performance and stock returns are predictable based on past returns. A number of scholars reported that past losers (lowest return-stocks) outperform past winners (highest return-stocks) or vice versa. This study mainly investigates the investment performance of momentum strategy and contrarian strategy in Vietnam stock market from January, 2004 to March, 2008 by using the same empirical methodology in Jegadeesh and Titman (1993). In this paper, I examine whether the momentum strategy and contrarian strategy can create significant return. Additionally, I investigate whether holding period influences the momentum and contrarian profits. Finally, I examine the relationship between trading volume and momentum profits. The empirical results show that during the period January, 2004 to March, 2008 momentum strategy works effectively over the horizon of 1, 5, 10, 20, 60 and 90 days, meanwhile, no contrarian strategy can make significant profit during the same horizon, which is quite different from other developed stock markets. Moreover, the results suggest that in Vietnam stock market it is better to limit the holding period in short term because momentum profit will decrease rapidly when holding period is longer and the best choice is limiting the trading and holding period to 5 days. Additionally, I find that buying high-volume winners and selling high-volume losers is more profitable than buying low-volume winners and selling low-volume losers. 계속투자전략 및 반전투자전략과 같은 과거성과에 기초한 투자전략은 오랫동안 많은 학계 및 실무계에서 연구되어 왔다. 연구 결과, 평균주식수익률이 과거성과와 관계가 있으며, 과거수익률에 기초하여 주식수익률을 예측할 수 있는 것으로 나타나고 있다. 몇몇 연구들은 과거 패자(최저수익률을 갖는 주식)가 과거 승자(최고수익률을 갖는 주식)보다 더 나은 성과를 올리거나 과거 승자가 과거 패자보다 더 나은 성과를 올린다고 제시하였다. 본 연구는 2004년 1월부터 2008년 3월까지 베트남 주식시장에서 Jegadeesh and Titman (1993)의 분석방법을 사용하여 계속투자전략과 반대투자전략의 투자성과를 분석한다. 본 연구에서 계속투자전략 및 반전투자전략이 유의한 수익률을 올리는가를 살펴본다. 또한 보유기간이 계속투자전략 및 반전투자전략의 이익에 영향을 미치는가를 분석한다. 마지막으로 거래량과 계속투자이익간의 관계를 분석한다. 실증분석 결과, 표본기간 동안 계속거래전략은 1, 5, 10, 20, 60 및 90일의 포트폴리오 구성 및 보유기간 동안 유의한 성과를 올리는 반면에 반전거래전략은 동일한 기간 동안 유의한 성과를 올리지 못하는 것으로 나타났다. 이러한 결과는 다른 선진국 시장을 대상으로 한 연구결과와는 차이가 있다. 게다가, 이런 결과는 베트남주식시장에서 보유기간이 길어짐에 따라 계속거래전략의 이익이 급격하게 감소하므로 보유기간을 제한하는 것이 더 바람직하며, 최선의 선택은 보유기간을 5일 이내로 제한하는 것임을 제시한다 거래량이 많은 주식으로 구성되는 승자포트폴리오를 매입하고 그렇지 않은 주식으로 구성되는 패자포트폴리오를 매도하는 것이 승자포트폴리오를 매도하고 패자포트폴리오를 매입하는 것보다 더 큰 이익을 창출하는 것을 발견하였다.

사춘기전 마우스 미측소핵의 아교질 신경세포에서 시트랄의 억제성 신경전달 조절에 대한 연구

Thao, Nguyen Thi Phuong 전북대학교 일반대학원 2020 국내석사

Citral (3,7-dimethyl-2,6-octadienal) is a monoterpene aldehyde consisting of isomers geranial and neral chemically. The substantia gelatinosa (SG) of the trigeminal subnucleus caudalis (Vc) is admitted as a key site of receiving and regulating orofacial nociceptive inputs. Although citral is known to be involved in antinociception, the action mechanism of citral on the SG neurons of the Vc has not been fully understood yet. In this study, I examined the direct membrane effects of citral and how citral mediates responses on the SG neurons of the Vc in juvenile mice using a whole-cell patch-clamp technique. Under high chloride pipette solution, citral showed repeatable inward currents that persisted in the presence of tetrodotoxin, a voltage-gated Na+ channel blocker, and 6-cyano-7-nitro-quinoxaline-2,3-dione, a non-N-methyl D-aspartate (NMDA) glutamate receptor antagonist, 2-amino-5-phosphonopentanoic acid, an NMDA receptor antagonist. However, the citral-induced inward currents were partially blocked by picrotoxin, a gamma-aminobutyric acid (GABA) type A receptor antagonist, or by strychnine, a glycine receptor antagonist. Further, the citral-induced responses were almost blocked by picrotoxin with strychnine. I also found that citral exhibited additive effect with GABA-induced inward currents and glycine-induced inward currents were potentiated by citral. In addition, citral suppressed the firing activities by positive current injection on the SG neurons of the Vc. Taken together, these results indicate that citral has glycine- and/or GABA-mimetic actions and suggest that citral might be a potential target for orofacial pain modulation by the activation of inhibitory neurotransmission in the SG area of the Vc. keywords : Citral, GABAA receptor, Glycine receptor, Patch-clamp, Substantia gelatinosa neuron

A POROUS MEMBRANE-INTEGRATED PMMA MICROFLUIDIC DEVICE FOR RELIABLE CYTOTOXICITY TESTS

Nguyen Thi Phuong Thao Ulsan National Institute of Science and Technology 2021 국내석사

High-throughput microfluidic devices for cytotoxicity screening are currently in high demand because they take much less turnaround time and cost only a fraction to fabricate comparing to the traditional animal testing method. However, most of the previous works have failed to construct a reliable drug testing platform since the largely exploited material - polydimethylsiloxane (PDMS) – absorbs even small hydrophobic molecules, such as anti-cancer drugs. Several previous studies have switched to thermoplastics, including poly(methyl methacrylate) (PMMA), for its inherent impermeability to small molecules. Still, there is no record shown to integrate these resins with polyethylene terephthalate (PETE) track-etched membrane to form a fully compartmentalized chip. This study reports a novel use of (3-glycidyloxypropyl)trimethoxysilane (GLYMO) to achieve an irreversible bonding of PMMA to PETE membranes for developing a drug-testing model. Briefly, the PMMA substrates engraved with microfluidic channels were functionalized with air plasma for 1 min and assembled with a 5% GLYMO - coated PETE membrane, followed by clamping and heating in an oven at 100 °C for 2 min. The fabricated device endured up to 135kPa in gauge pressure and 1.97 × 10^7 kg m^-2 in shear force before showing any signs of liquid leakage. Drug testing efficacy was successfully validated as human lung adenocarcinoma cells showed more reliable cytotoxicity results for vincristine when cultured in the PMMA devices than those in the PDMS counterpart. Overall, our bonding approach was proven to be more advantageous over the fabrication methods using PDMS to construct a highly robust and reliable microfluidic device for promising pharmaceutical drug screening applications.