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Caries Arresting Effect of Silver Diamine Fluoride in Vietnamese Preschool Children
Yen Hoang Thi Nguyen,Masayuki Ueno,Takashi Zaitsu,Toai Nguyen,Yoko Kawaguchi 대한예방치과학회 2017 International Journal of Clinical Preventive Denti Vol.13 No.3
Objective: A 1-year longitudinal study compared the effectiveness of annual and biannual silver diamine fluoride (SDF) applications on caries arrest among preschool children. Methods: A total of 295 children aged 2 to 3 years from 6 public preschools in Vietnam were selected and divided into 3 groups: Group 1 (G1) received annual SDF (n=90), Group 2 (G2) received biannual SDF (n=99), and Group 3 (G3) did not receive SDF (n=106). Clinical oral examination was performed at baseline, 6 months and 1 year. Results: Mean ds, the main component of dmfs, were 14.92 in G1, 15.91 in G2, and 18.17 in G3 at baseline, and no significant differences were found between the 3 groups. From baseline to 6 months and to 1 year, mean ds increased significantly in all children: 1.88 and 3.75 in G1, 2.22 and 3.47 in G2, and 5.20 and 8.91 in G3. Mean ds was significantly higher in G3 than G1 and G2 at 6 months and 1 year. At baseline, about 60% of active carious surfaces were treated with SDF in both G1 and G2. The proportions of arrested caries surfaces at 6 months and 1 year were 61.8% and 47.6% in G1, and 57.7% and 64.0% in G2. Significantly higher proportions of arrested caries surfaces were observed in G2 than G1 at 1 year. Conclusion: The study demonstrated a caries arresting effect of SDF in preschool children and its effect was greater after biannual application than annual application.
Using Electron-beam Resists as Ion Milling Mask for Fabrication of Spin Transfer Devices
Hoang Yen Thi Nguyen,Hyunjung Yi,Kyung-Ho Shin 한국자기학회 2007 Journal of Magnetics Vol.12 No.1
Magnetic excitation and reversal by a spin polarized current via spin transfer have been a central research topic in spintronics due to its application potential. Special techniques are required to fabricate nano-scale magnetic layers in which the effect can be observed and studied. This work discusses the possibility of using electron- beam resists, the nano-scale patterning media, as ion milling mask in a subtractive fabrication method. The possibility is demonstrated by two resists, one positive tone, the ZEP 520A, and one negative tone, the ma- N2403. The advantage and the key points for success of this process will be also addressed.
Field Dependence of Switching Currents in an Exchange Biased Spin Valve
Nguyen, Hoang Yen Thi,Joo, Sung-Jung,Jung, Kuyoul,Shin, Kyung-Ho American Scientific Publishers 2007 Journal of nanoscience and nanotechnology Vol.7 No.1
<P>Current induced magnetic reversal due to spin transfer torque is a promising candidate in advanced information storage technology. It has been intensively studied. This work reports the field-dependence of switching-currents for current induced magnetization switching in a uncoupled nano-sized cobalt-based spin valve of exchange biased type. The dependency is investigated in hysteretic regime at room temperature, in comparison with that of a trilayer simple spin valve. In the simple spin valve, the switching currents behave to the positive and the negative applied magnetic field symmetrically. In the exchange biased type, in contrast, the switching currents respond to the negative field in a quite unusual and different manner than to the positive field. A negative magnetic field then can shift the switching-currents into either negative or positive current range, dependently on whether a parallel or an antiparallel state of the spin valve was produced by that field. This different character of switching currents in the negative field range can be explained by the effect of the exchange bias pinning field on the spin-polarizer (the fixed Co layer) of the exchange biased spin valve. That unidirectional pinning filed could suppress the thermal magnetization fluctuation in the spin-polarizer, leading to a higher spin polarization of the current, and hence a lower switching current density than in the simple spin valve.</P>
Tran Thi Hoang Oanh,Nguyen Thi Yen Hoai,Pham Thi Thuy 한국보건의료인국가시험원 2021 보건의료교육평가 Vol.18 No.-
Purpose: Simulation teaching refers to the replication of real-life scenarios, enabling students to practice nursing skills and learn actively in a safe environment. It also helps students control their anxiety and fears when caring for real patients. This study investigated the relationships of Vietnamese nursing students’ self-confidence in clinical practice with their satisfaction and self-confidence in simulation- based practice. Methods: This cross-sectional descriptive study included 182 nursing students. The data collection included 2 separate stages with 2 main questionnaires. The Student Satisfaction and Self-Confidence in Learning Scale was used to measure students’ satisfaction and self-confidence after learning in the simulation room. The Confidence Scale was used to measure students’ self-confidence when first performing techniques on actual patients. Data were analyzed by descriptive and Pearson correlation statistics. Results: Students’ satisfaction and self-confidence during the simulation course were quite high (mean±standard deviation [SD], 4.06±0.48 and 4.11±0.46 out of 5.0, respectively). In contrast, their confidence when first practicing on a patient was moderate (mean±SD, 3.19±0.62 out of 5.0). Students’ satisfaction showed moderate and weak positive correlations with self-confidence in pre-clinical practice and in clinical practice (r=0.33, P<0.001 and r=0.26, P<0.001, respectively). Conclusion: Simulation has become an effective teaching strategy that can help nursing students be well-prepared for clinical placements in Vietnam. An effective nursing education strategy is needed to enhance the satisfaction and self-confidence of nursing students in simulation and then in clinical practice to help achieve professional engagement and development.
The Potential Leaked Nanoparticles from Tire Wear Particle to Aquarium Environment
Le Thi Hoang Yen,Jong-Sang Youn,Ki-Joon Jeon 한국대기환경학회 2021 한국대기환경학회 학술대회논문집 Vol.2021 No.10
Tire wear particle (TWP) has been concerned as the non-exhaust emission and also one of the main source of microplastics, TWP has 25% of chance to reach surface water which directly triggers the adverse effects to aquarium ecosystem. Due to the lacking of ecotoxicological studies regarding TWP dispersed in fresh water, plus the specific analysis on the fate of TWP after exposure to water. Here, we tested the possibility of nanoparticles leaching from TWP which generated from simulation system, under fresh water and sea water environment. The finding of carbon black nanoparticles and ZnO nanoparticles leaked from TWP dispersed in water under room temperature after couple of weeks can play the key in short-term toxicity to aquarium species. The further research would focus on the both short and long-term toxicity to zebrafish embryo of leached nanoparticles from TWP.
Chemical constituents of the Annona glabra fruit and their cytotoxic activity.
Hien, Nguyen Thi Thu,Nhiem, Nguyen Xuan,Yen, Duong Thi Hai,Hang, Dan Thi Thuy,Tai, Bui Huu,Quang, Tran Hong,Tuan Anh, Hoang Le,Kiem, Phan Van,Minh, Chau Van,Kim, Eun-Ji,Kim, Seung Hyun,Kang, Hee Kyoun Swets Zeitlinger 2015 PHARMACEUTICAL BIOLOGY Vol.53 No.11
<P>Traditional Chinese medicines have attracted increasing interest as potential sources of novel drugs with a wide range of biological and pharmacological activities. Annona glabra Linn (Annonaceae) is used in traditional medicine as an anticancer drug. Phytochemical investigation of this plant led to the isolation of acetogenins, ent-kauranes, peptides, and alkaloids. In addition, compounds exhibited anticancer, anti-HIV-reserve, and antimalaria.</P>
Minh PHAM,Thao Yen DANG,Thi Hong Yen HOANG,Thi Thanh Nga TRAN,Thi Huong Quynh NGO 한국유통과학회 2021 The Journal of Asian Finance, Economics and Busine Vol.8 No.11
The purpose of this study is to understand the impact of influencers on generation Z (Gen Z) in the online environment. This article has applied the theories of source credibility, TAM, IAM, and TPB to identify influencer characteristics that affect the purchasing behaviors of Gen Z customers. This research was conducted using a Google Form survey with 24 pre-designed questions. A total of 464 valid questionnaires from Gen Z Vietnamese were collected between November 2020 and January 2021. Data was analyzed using partial least squares structural equation modeling (PLS-SEM) with SmartPLS 3 software. The analysis results confirmed that the components of influencer credibility have a positive impact on Gen Z’s purchasing behaviors under the mediated influence of argument quality, perceived usefulness, and social influence. Surprisingly, for Gen Z, the influencers’ attractiveness has the strongest impact on their online behavior. More specifically, attractiveness plays the most important role in the perceived usefulness and social influence of Gen Z customers, while influencers’ expertise has the strongest impact on argument quality delivered to customers. This study provides evidence of a change in the way Gen Z responds to marketing activities. They are more drawn by the attraction of influencers than their expertise.