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CONVERGENCE RESULTS FOR NON-OVERLAP SCHWARZ WAVEFORM RELAXATION ALGORITHM WITH CHANGING TRANSMISSION CONDITIONS

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Acta Mathematica Scientia 2022年第1期42卷 105-126页

作者： Minh-Phuong TRAN Thanh-Nhan NGUYEN phuoc-toan huynh Nhu-Binh LY Minh-Dang NGUYEN Quoc-Anh HO Applied Analysis Research Group Faculty of Mathematics and StatisticsTon Duc Thang UniversityHo Chi Minh cityVietnam Department of Mathematics Ho Chi Minh City University of EducationHo Chi Minh cityVietnam Faculty of Mathematics and Statistics Ton Duc Thang UniversityHo Chi Minh cityVietnam

In this paper,we establish a new algorithm to the non-overlapping Schwarz domain decomposition methods with changing transmission conditions for solving one dimensional advection reaction diffusion *** precisely,we first describe the new algorithm and prove the convergence results under several natural assumptions on the sequences of parameters which determine the transmission *** we give a simple method to estimate the new value of parameters in each *** interesting advantage of our method is that one may update the better parameters in each iteration to save the computational cost for optimizing the parameters after many *** some numerical experiments are performed to show the behavior of the convergence rate for the new method.

关键词： domain decomposition method Schwarz waveform relaxation algorithm advection reaction diffusion changing transmission conditions

Dry eye rate and its relationship with disease stage in patients with primary hypertension:a cross-sectional study in Vietnam

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International Journal of Ophthalmology(English edition) 2024年第4期17卷 653-658页

作者： Tran Tat Thang Pham Hong Phuong Nguyen Sa huynh Nguyen Trung Kien NguyenDuy toan Nguyen Thi Thu Ha Le Ha Khoa Nguyen Huu Dung Thai Doan Thang Le Viet Thang Nghe An Eye Hospital Nghe An 43000Vietnam Nghe An Friendship General Hospital Nghe An 43000Vietnam Military Hospital 103 Ha Noi 100000Vietnam Vietnam Military Medical University Ha Noi 100000Vietnam Hanoi Medical University Ha Noi 100000Vietnam Bạch Mai Hospital Ha Noi 100000Vietnam TTH Vinh General Hospital Nghe An 100000Vietnam

AIM:To determine the dry eye(DE)rate and its relationship with disease stage in patients with primary ***:A cross-sectional study included 432 patients with primary hypertension(with an equal number of patients in each group:144 in stage Ⅰ,Ⅱ,and Ⅲ hypertension)and 144 healthy subjects as a control *** Ocular Surface Disease Index(OSDI)and Schirmer Ⅰ test without anesthetics were conducted on all 576 *** with OSDI scores<13 and Schirmer Ⅰ values equal to or under 10 mm were diagnosed with ***:The ratio of DE in hypertension patients was higher than in the control group(41.7%versus 18.8%;P<0.001).The proportion of patients with DE increased gradually according to the hypertension stage:27.1% in stage Ⅰ,40.3% in stage Ⅱ,and 57.6% in stage Ⅲ,P<***,duration of hypertension,plasma urea,creatinine,and high-sensitivity C-reactive protein(CRP-hs)levels in hypertension patients with DE were higher than those without DE,P<*** age,a long duration of hypertension,diabetes mellitus,elevated plasma creatinine,and CRP-hs levels were independent factors associated with DE in primary hypertension patients,P<***:DE is a common disorder associated with advanced age,a long duration of hypertension,diabetes mellitus,elevated plasma CRP-hs,and creatinine levels in patients with primary hypertension.

关键词： primary hypertension dry eye stage of hypertension plasma creatinine

Integrating Machine Learning and Evidential Reasoning for User Profiling and Recommendation

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Journal of Systems Science and Systems Engineering 2023年第4期32卷 393-412页

作者： toan Nguyen Mau Quang-Hung Le Duc-Vinh Vo Duy Doan Van-Nam huynh University of Information Technology Ho Chi Minh CityVietnam Vietnam National University Ho Chi Minh CityVietnam Department of Information Technology Quy Nhon UniversityQuy NhonVietnam Ho Chi Minh City University of Banking Ho Chi Minh CityVietnam School of Knowledge Science Japan Advanced Institute of Science and TechnologyIshikawaJapan

User profiles representing users’preferences and interests play an important role in many applications of personalized *** the rapid growth of social platforms,there is a critical need for efficient solutions to learn user profiles from the information they shared on social platforms so as to improve the quality of recommendation *** problem of user profile learning is significantly challenging due to difficulty in handling data from multiple sources,in different formats and often associated with *** this paper,we introduce an integrated approach that combines advanced Machine Learning techniques with evidential reasoning based on Dempster-Shafer theory of evidence for user profiling and *** developed methods for user profile learning and multi-criteria collaborative filtering are demonstrated with experimental results and analysis that show the effectiveness and practicality of the integrated approach.A proposal for extending multi-criteria recommendation systems by incorporating user profiles learned from different sources of data into the recommendation process so as to provide better recommendation capabilities is also highlighted.

关键词： Machine learning Dempster-Shafer theory of evidence user profiles personalized recommendation preferences

Tail dependence in emerging ASEAN-6 equity markets: empirical evidence from quantitative approaches

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Financial Innovation 2020年第1期6卷 69-94页

作者： Duy Duong toan Luu Duc huynh University of Economics Ho Chi Minh CityVietnam School of Banking University of Economics Ho Chi Minh City59C Nguyen Dinh Chieu StreetDistrict 3Ho Chi Minh CityVietnam

This study contributes a rich set of quantitative methodologies including a nonparametric approach(Chi-plots and K-plots)as well as copulas(traditional and timevarying with Student’s t-copulas)to the existing literature in terms of determining the dependence structure in ASEAN stock *** on the emerging ASEAN equity returns of six countries from January 2001 to December 2017,we found that Student’s t-copulas under time-varying approach is the most appropriate approach to explain these *** all research return pairs,the dependence between Vietnam and other ASEAN equity indices has the lowest ***,all couples show left-and right-tail dependence by each pair for pre-and postfinancial ***,diversification across these pairs of equity markets from ASEAN is still adequate for international investors,though it might trigger contagion risks.

关键词： ASEAN Stock indexes Chi-plots K-plots T-copulas Time-varying copulas

Forecasting cryptocurrency returns and volume using search engines

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Financial Innovation 2019年第1期5卷 29-41页

作者： Muhammad Ali Nasir toan Luu Duc huynh Sang Phu Nguyen Duy Duong Leeds Beckett University 520 Rose BowlLeeds LS13HBUK University of Economics Ho Chi Minh City Ho Chi Minh CityVietnam Banking University of Ho Chi Minh City Ho Chi Minh CityVietnam

In the context of the debate on the role of cryptocurrencies in the economy as well as their dynamics and forecasting,this brief study analyzes the predictability of Bitcoin volume and returns using Google search *** employed a rich set of established empirical approaches,including a VAR framework,a copulas approach,and non-parametric drawings,to capture a dependence *** a weekly dataset from 2013 to 2017,our key results suggest that the frequency of Google searches leads to positive returns and a surge in Bitcoin trading *** to search values have a positive effect,which persisted for at least a *** findings contribute to the debate on cryptocurrencies/Bitcoins and have profound implications in terms of understanding their dynamics,which are of special interest to investors and economic policymakers.

关键词： Financial innovation Forecasting Blockchain Google search values Bitcoin Cryptocurrencies

Preventing crash in stock market:The role of economic policy uncertainty during COVID‑19

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Financial Innovation 2021年第1期7卷 654-668页

作者： Peng‑Fei Dai Xiong Xiong Zhifeng Liu toan Luu Duc huynh Jianjun Sun College of Management and Economics Tianjin UniversityTianjinChina School of Business East China University of Science and TechnologyShanghaiChina Management School Hainan UniversityHaikouChina Chair of Behavioral Finance WHU-Otto Beisheim School of ManagementVallendarGermany School of Banking University of Economics Ho Chi Minh CityHo Chi Minh CityVietnam School of Economics Hainan UniversityHaikouChina

This paper investigates the impact of economic policy uncertainty(EPU)on the crash risk of US stock market during the COVID-19 *** this end,we use the GARCHS(GARCH with skewness)model to estimate daily skewness as a proxy for the stock market crash *** empirical results show the significantly negative correlation between EPU and stock market crash risk,indicating the aggravation of EPU increase the crash ***,the negative correlation gets stronger after the global COVID-19 outbreak,which shows the crash risk of the US stock market will be more affected by EPU during the epidemic.

关键词： COVID-19 Economic policy uncertainty Crash risk Skewness

The Cooperation of Logistics Among European Countries as These Experiences for South East Countries When It Comes to the Establishment of ASEAN Economic Community

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Management Studies 2017年第1期5卷 38-48页

作者： Linh Duy Bui toan huynh Luu Duc Foreign Trade University Ha Noi City Vietnam Banking University of rio Chi Minh City Ho Chi Minh City Vietnam

The called paper presents logistics cooperation activities in European countries, which are put in the situation of establishment of ASEAN Economic Community, particularly South East countries. This will be considered as the experience in managing by government officers as well as the board management of logistics. The authors＇ methodology is almost descriptive, theoretical analyses. In addition, conducting information-related survey and in-depth interviews by experts will be considered in case of necessary. This paper focuses on Logistic Corporation leading to result in some benefits including bringing on effective in transportation, cutting cost, and saving time; improving the transportation connectivity among countries in ASEAN area; facilitating the construction of infrastructure and legal framework, and assisting to develop regional logistic activity. In this research, the authors focus on analyzing in the period before and after 2015, they attempt to investigate the turning point in the installment of ASEAN Economic Community, including 10 countries with the signed print by the prime minister in these nations. For future research, it is suggested that the cooperation is worth taking into consideration as the innovation related to management activities in microscopes （inside business） as well as macro scopes （countries） in logistics sector. Furthermore, lessons from the success of the European market are the basis foundation for the ASEAN Economic Community in setting up a common market in the field of logistics, shortening time to avoid mistakes and making the intended plan more possible to develop regional logistic activity. Logistic cooperation among nations has played an important and critical role in formation and development of country collaboration, creating the efficiency and capacity of trade among nations of region. Consequently, this paper can provide valuable pointers for shaping AEC.

关键词： cooperation of logistics ASEAN economic community European countries