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Observation of Quantum-like Interference Effect in Graphene-based Devices with Random Co Clusters
Thi-Nga Do,Sehee Lee,Chanyong Hwang,Tae Hee Kim 한국자기학회 2021 한국자기학회 학술연구발표회 논문개요집 Vol.31 No.1
The quantum correction to the conductivity in graphene has been taking numerous interests due to its unique electronic band structure as well as the chiral nature of its charge carriers. In this work, we focused on demonstrating the interplay of graphene\Co interface for the observation of quantum-like interference effect in the graphene-based heterostructures. In order to clarify the role of interface effect, a sequence of devices as a function of Co thickness from 0 – 2.5nm sandwiched between large-area CVD graphene and 3.0nm-thick of Hall bar Pt has been prepared using in-situ shadow mask patterning technique by the UHV-MBE system. Surprisingly, the magnetoresistance (MR) results clearly indicated not only the co-existence of weak localization (WL) and weak antilocalization (WAL) effect at 77K but also a remarkable enhancement of both localization effects as decreasing the Co thickness. Interestingly, it is important to declare that we observed the highest upturn MR curvature in the sample with 0.5 Å at the large applied magnetic field, which could be elucidated by the random Co clusters act as the magnetic scattering centers. For microstructural characterization of the heterostructures, the careful analysis of interface properties was performed using the atomic force microscope (AFM). Our results provide further insights into this phenomenon and highlight the aspect of interface engineering of 2D-material with other ferromagnetic materials to manipulate and develop highly effective spintronic devices with new functionalities.
Banking Sector Depth and Economic Growth: Empirical Evidence from Vietnam
LE, Thi Thuy Hang,LE, Trung Dao,TRAN, Thi Dien,DUONG, Quynh Nga,DAO, Le Kieu Oanh,DO, Thi Thanh Nhan Korea Distribution Science Association 2021 The Journal of Asian Finance, Economics and Busine Vol.8 No.3
The Vietnamese economy is a developing country that has brought many opportunities and challenges for the banking system. Commercial banks have developed strongly from quality to quantity, which plays a vital role in developing the economy. They play an important role in capital formation, which is essential for the economic development of a country. They provide financial services to the general public and businesses, ensuring economic and social stability and sustainable growth of the economy. Therefore, the relationship between bank depth and economic growth is of importance in research. This paper used a VAR (Vector Autoregressive Models) estimator for time series data models. The data is collected quarterly from the first quarter of the year 2000 to 2020. The study uses the VAR model to examine the causal relationships of economic growth, growth in money supply expansion, private sector capital requirement, and banks' domestic credit. The results indicate a general short-run relationship between banking sector depth and economic growth with a positive connection, but in the long term, the relationship between these variables can be reversed because of other macro factors. The findings show the two-way causal relationship between GDP growth and banking depth factors. This research contributes to policy-making by underlining the banking sector depth determinants when setting regulations and policies to develop the banking sector.
Han Thi Vo,Tien Duc Dao,Tuyen Van Duong,Tan Thanh Nguyen,Binh Nhu Do,Tinh Xuan Do,Khue Minh Pham,Vinh Hai Vu,Linh Van Pham,Lien Thi Hong Nguyen,Lan Thi Huong Le,Hoang Cong Nguyen,Nga Hoang Dang,Trung 질병관리청 2024 Osong Public Health and Research Persptectives Vol.15 No.1
Objectives: The incidence of posttraumatic stress disorder (PTSD) has increased, particularly among individuals who have recovered from coronavirus disease 2019 (COVID-19) infection. Health literacy is considered a “social vaccine” that helps people respond effectively to the pandemic. We aimed to investigate the association between long COVID-19 and PTSD, and to examine the modifying role of health literacy in this association.Methods: A cross-sectional study was conducted at 18 hospitals and health centers in Vietnam from December 2021 to October 2022. We recruited 4,463 individuals who had recovered from COVID-19 infection for at least 4 weeks. Participants provided information about their sociodemographics, clinical parameters, health-related behaviors, health literacy (using the 12-item short-form health literacy scale), long COVID-19 symptoms and PTSD (Impact Event Scale-Revised score of 33 or higher). Logistic regression models were used to examine associations and interactions.Results: Out of the study sample, 55.9% had long COVID-19 symptoms, and 49.6% had PTSD. Individuals with long COVID-19 symptoms had a higher likelihood of PTSD (odds ratio [OR], 1.68; 95% confidence interval [CI], 1.63–2.12; p<0.001). Higher health literacy was associated with a lower likelihood of PTSD (OR, 0.98; 95% CI, 0.97–0.99; p=0.001). Compared to those with long COVID-19 symptoms and the lowest health literacy score, those with long COVID-19 symptoms and a 1-point health literacy increment had a 3% lower likelihood of PTSD (OR, 0.97; 95% CI, 0.96–0.99; p=0.001).Conclusion: Health literacy was found to be a protective factor against PTSD and modified the negative impact of long COVID-19 symptoms on PTSD.
( Nguyen Thai Son ),( Vu Thi Thu Huong ),( Vu Thi Kim Lien ),( Do Thi Quynh Nga ),( Tran Thi Hai Au ),( Tang Thi Nga ),( Le Nguyen Minh Hoa ),( Tran Quang Binh ) 한국미생물생명공학회(구 한국산업미생물학회) 2019 Journal of microbiology and biotechnology Vol.29 No.9
The extensive distribution of multidrug-resistant (MDR) methicillin-resistant Staphylococcus aureus (MRSA) poses a threat to healthcare worldwide. This study aimed to investigate the MDR and molecular patterns of MRSA isolates in children admitted to the two biggest tertiary care pediatric hospitals in northern and southern Vietnam. A total of 168 MRSA strains were collected to determine antibiotic susceptibility by minimum inhibitory concentration tests. Antibiotic-resistant genes, pulsed-field gel electrophoresis, staphylococcal cassette chromosome mec (SCCmec) typing, and multilocus sequence typing were used for the molecular characterization of MRSA. Among the total strains, the MDR rate (51.8%) was significantly higher in the northern hospital than in the southern hospital (73% vs. 39%, p < 0.0001). The MDR-MRSA with the highest rates were “ciprofloxacin-erythromycin-gentamicin-tetracyclines” (35.6%), followed by “erythromycin-tetracycline-chloramphenicol” (24.1%), and “ciprofloxacin-erythromycin-gentamicin” (19.5%), showing an accumulative total of 79.3%. The most susceptible antibiotics were rifampicin (100%) and vancomycin (100%), followed by doxycycline (94.0%), meropenem (78.0%), and cefotaxime (75.0%). The SCCmecII strains showed greater resistance to gentamicin, ciprofloxacin, tetracycline, meropenem and cephalosporins compared with the other strains. The SCCmecII strains exhibited the highest rate in the tested genes (aacA/aphD: 55.2%, ermA/B/C: 89.7%, and tetK/M: 82.8%). ST5-SCCmecII was the predominant clone in the northern hospital, whereas SCCmecIVa was more pronounced in the southern hospital. In conclusion, our results raised concerns about the predominant MDR-MRSA strains in the pediatric hospitals in Vietnam. The north-south difference in the antibiotic resistance patterns and genetic structure of MRSA suggests different MRSA origins and various uses of antimicrobial agents between the two regions.
Colorimetric Determination of Singlet Oxygen Scavengers Using a Protein Photosensitizer
Miso Kim,Eun Hye Kim,Thi Hai Yen Pham,Tuan Anh Hoang Le,Thi Phuong Do,Thi Nga Nguyen,Thi Cuc Nguyen,Ha Phuong Trieu,Thi Thao Do,김영필 한국바이오칩학회 2020 BioChip Journal Vol.14 No.2
Despite the diverse roles of singlet oxygen ( 1 O2) in plants and animals, simple detection of 1 O2 has been limited due to technical difficulties. Here we report a colorimetric method for visualizing the generation and suppression of 1 O2 using a protein photosensitizer, mini singlet oxygen generator (miniSOG). Upon external light irradiation, miniSOG strongly produced 1 O2 and oxidized a universal chromogenic reagent, tetramethylbenzidine, leading to a rapid color change in solution. We used this finding to demonstrate the 1 O2 scavenging effects of well-known antioxidants and of natural compounds extracted from plants. Owing to its high usability and simplicity, our developed assay platform will be useful for screening potential scavengers for reactive oxygen species and will promote the development of various antioxidants.
DO, Duc Tai,NGUYEN, Tien Hung,NGUYEN, Thi Hong Nga,HA, Hong Hanh,LE, Thi Tam Korea Distribution Science Association 2020 The Journal of Asian Finance, Economics and Busine Vol.7 No.3
The research aims to examine the impact of leadership style on accountants' commitment with FDI firms in Vietnam based on theory of Bass and Avolio (2004). A survey with 110 accountants in FDI firms was conducted. The total of 110 respondents with full information were used for data entry and analysis. Through quantity methodology, we used Cronbach's Alpha, EFA and correlation analysis to determine the relationship between leadership style and three dependent variables including affective, normative and continuance commitment. The results showed that the leadership style had positive relationships with accountants' commitments. In particular, normative commitment with FDI firms of accountants is the most strongest. In addition, there is no statistically difference in the level of three commitments with FDI firms of accountants for three groups of job description. From the findings, this study suggests several recommendations to improve accountants' commitments such as intellectually stimulating, individualized consideration, inspirational motivation, idealized influence, and idealized influence behavior. The results are considered as a useful reference for establishing policies to attract talent personnel toward to sustainable development of firms. Commitment with the organization is a crucial factor to gain a competitive advantage and guide the success of organizations by satisfying customers, maintaining productivity and efficiency.