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Search Results: 1 - 10 of 1295 matches for " Vo Minh Hien "
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Rainfall Threshold Analysis and Bayesian Probability Method for Landslide Initiation Based on Landslides and Rainfall Events in the Past  [PDF]
Hien Minh Do, Kun Long Yin
Open Journal of Geology (OJG) , 2018, DOI: 10.4236/ojg.2018.87040
Abstract: In this paper a rainfall threshold and a Bayesian probability model are presented for the landslide occurrence of shallow landslides in Ha Giang city and the surroundings, Vietnam. The model requires the data on daily rainfall combined with the actual dates of landslide occurrences. Careful study on the database is a prerequisite for the paper. For this reason, selecting the input data was carried out carefully to ensure the reliable results of the study. The daily rainfall data covering a time span of 57 years was collected from a unique rain gauge station of National Centre for Hydro-meteorological Forecasting of Vietnam (from 1957 to 2013) and a landslide database with some landslides (37 of total of 245 landslides) that containing dates of occurrence, was prepared from historical records for the period 1989 to 2013. Rainfall thresholds were generated for the study area based on the relationship between daily and antecedent rainfall of the landslide events. The results shows that 3-day antecedent rainfall (with the rainfall threshold was established: RT = 40.8 0.201R3ad) gives the best fit for the existing landslides in the landslide database. The Bayesian probability model for one-dimensional case was established based on 26 landslides for the period 1989 to 2009, daily rainfall data with the same time and the values of probability varies from 0.03 to 0.44. Next, the Bayesian probability model for two-dimensional case was generated based on 11 landslides, rainfall intensity and duration in three months (May, June and July) of 2013 and the values of probability ranges from 0.08 to 0.67, and computed values of conditional landslide probability P(A|B) from two-dimensional case of Bayesian approach are clearly controlled by rainfall intensity > 40 mm with rainfall duration > 0.3 day.
Kinetics of Neutralizing Antibodies in Patients Naturally Infected by H5N1 Virus
Philippe Buchy,Sirenda Vong,Simon Chu,Jean-Michel Garcia,Tran Tinh Hien,Vo Minh Hien,Mey Channa,Do Quang Ha,Nguyen Van Vinh Chau,Cameron Simmons,Jeremy J. Farrar,Malik Peiris,Menno D. de Jong
PLOS ONE , 2012, DOI: 10.1371/journal.pone.0010864
Abstract: Little is known about the kinetics of anti-H5 neutralizing antibodies in naturally H5N1-infected patients with severe clinical illness or asymptomatic infection.
Viral Etiologies of Acute Respiratory Infections among Hospitalized Vietnamese Children in Ho Chi Minh City, 2004–2008
Anh Ha Lien Do,H. Rogier van Doorn,My Ngoc Nghiem,Juliet E. Bryant,Thanh Hang thi Hoang,Quang Ha Do,Tan Le Van,Tan Thanh Tran,Bridget Wills,Vinh Chau van Nguyen,Minh Hien Vo,Cong Khanh Vo,Minh Dung Nguyen,Jeremy Farrar,Tinh Hien Tran,Menno D. de Jong
PLOS ONE , 2012, DOI: 10.1371/journal.pone.0018176
Abstract: The dominant viral etiologies responsible for acute respiratory infections (ARIs) are poorly understood, particularly among hospitalized children in resource-limited tropical countries where morbidity and mortality caused by ARIs are highest. Improved etiological insight is needed to improve clinical management and prevention.
Partner orbits and action differences on compact factors of the hyperbolic plane. II: Higher-order encounters
Hien Minh Huynh
Physics , 2015,
Abstract: Physicists have argued that periodic orbit bunching leads to universal spectral fluctuations for chaotic quantum systems. To establish a more detailed mathematical understanding of this fact, it is first necessary to look more closely at the classical side of the problem and determine orbit pairs consisting of orbits which have similar actions. We specialize to the geodesic flow on compact factors of the hyperbolic plane as a classical chaotic system. The companion paper [14] proved the existence of a unique periodic partner orbit for a given periodic orbit with a small-angle self-crossing in configuration space that is a 2-encounter and derived an estimate for the action difference of the orbit pair. In this paper, we provide an inductive argument to deal with higher-order encounters: we prove that a given periodic orbit including an $L$-parallel encounter has $(L-1)!-1$ partner orbits; we construct partner orbits and give estimates for the action differences between orbit pairs.
Viral Etiology of Encephalitis in Children in Southern Vietnam: Results of a One-Year Prospective Descriptive Study
Le Van Tan ,Phan Tu Qui,Do Quang Ha,Nguyen Bach Hue,Lam Quoi Bao,Bach Van Cam,Truong Huu Khanh,Tran Tinh Hien,Nguyen Van Vinh Chau,Tran Tan Tram,Vo Minh Hien,Tran Vu Thieu Nga,Constance Schultsz,Jeremy Farrar,H. Rogier van Doorn,Menno D. de Jong
PLOS Neglected Tropical Diseases , 2010, DOI: 10.1371/journal.pntd.0000854
Abstract: Background Acute encephalitis is an important and severe disease in children in Vietnam. However, little is known about the etiology while such knowledge is essential for optimal prevention and treatment. To identify viral causes of encephalitis, in 2004 we conducted a one-year descriptive study at Children's Hospital Number One, a referral hospital for children in southern Vietnam including Ho Chi Minh City. Methodology/Principal Findings Children less than 16 years of age presenting with acute encephalitis of presumed viral etiology were enrolled. Diagnostic efforts included viral culture, serology and real time (RT)-PCRs. A confirmed or probable viral causative agent was established in 41% of 194 enrolled patients. The most commonly diagnosed causative agent was Japanese encephalitis virus (n = 50, 26%), followed by enteroviruses (n = 18, 9.3%), dengue virus (n = 9, 4.6%), herpes simplex virus (n = 1), cytomegalovirus (n = 1) and influenza A virus (n = 1). Fifty-seven (29%) children died acutely. Fatal outcome was independently associated with patient age and Glasgow Coma Scale (GCS) on admission. Conclusions/Significance Acute encephalitis in children in southern Vietnam is associated with high mortality. Although the etiology remains unknown in a majority of the patients, the result from the present study may be useful for future design of treatment and prevention strategies of the disease. The recognition of GCS and age as predictive factors may be helpful for clinicians in managing the patient.
Viral Aetiology of Central Nervous System Infections in Adults Admitted to a Tertiary Referral Hospital in Southern Vietnam over 12 Years
Le Van Tan ,Le Hong Thai,Nguyen Hoan Phu,Ho Dang Trung Nghia,Ly Van Chuong,Dinh Xuan Sinh,Nguyen Duy Phong,Nguyen Thi Hoang Mai,Dinh Nguyen Huy Man,Vo Minh Hien,Nguyen Thanh Vinh,Jeremy Day,Nguyen Van Vinh Chau,Tran Tinh Hien,Jeremy Farrar,Menno D. de Jong,Guy Thwaites,H. Rogier van Doorn,Tran Thi Hong Chau
PLOS Neglected Tropical Diseases , 2014, DOI: 10.1371/journal.pntd.0003127
Abstract: Background Central nervous system (CNS) infections are important diseases in both children and adults worldwide. The spectrum of infections is broad, encompassing bacterial/aseptic meningitis and encephalitis. Viruses are regarded as the most common causes of encephalitis and aseptic meningitis. Better understanding of the viral causes of the diseases is of public health importance, in order to better inform immunization policy, and may influence clinical management. Methodology/Principal Findings Study was conducted at the Hospital for Tropical Diseases in Ho Chi Minh City, a primary, secondary, and tertiary referral hospital for all southern provinces of Vietnam. Between December 1996 and May 2008, patients with CNS infections of presumed viral origin were enrolled. Laboratory diagnostics consisted of molecular and serological tests targeted at 14 meningitis/encephalitis-associated viruses. Of 291 enrolled patients, fatal outcome and neurological sequelae were recorded in 10% (28/291) and 27% (78/291), respectively. Mortality was especially high (9/19, 47%) amongst those with confirmed herpes simplex encephalitis which is attributed to the limited availability of intravenous acyclovir/valacyclovir. Japanese encephalitis virus, dengue virus, herpes simplex virus, and enteroviruses were the most common viruses detected, responsible for 36 (12%), 19 (6.5%), 19 (6.5%) and 8 (2.7%) respectively, followed by rubella virus (6, 2%), varicella zoster virus (5, 1.7%), mumps virus (2, 0.7%), cytomegalovirus (1, 0.3%), and rabies virus (1, 0.3%). Conclusions/Significance Viral infections of the CNS in adults in Vietnam are associated with high morbidity and mortality. Despite extensive laboratory testing, 68% of the patients remain undiagnosed. Together with our previous reports, the data confirm that Japanese encephalitis virus, dengue virus, herpes simplex virus, and enteroviruses are the leading identified causes of CNS viral infections in Vietnam, suggest that the majority of morbidity/mortality amongst patients with a confirmed/probable diagnosis is preventable by adequate vaccination/treatment, and are therefore of public health significance.
Modeling of Ship Surface with Non Uniform B-Spline
Vo Trong Cang,Tat-Hien Le
Lecture Notes in Engineering and Computer Science , 2011,
Abstract:
Early Pandemic Influenza (2009 H1N1) in Ho Chi Minh City, Vietnam: A Clinical Virological and Epidemiological Analysis
Tran Tinh Hien equal contributor,Maciej F. Boni equal contributor ,Juliet E. Bryant equal contributor,Tran Thuy Ngan equal contributor,Marcel Wolbers,Tran Dang Nguyen,Nguyen Thanh Truong,Nguyen Thi Dung,Do Quang Ha,Vo Minh Hien,Tran Tan Thanh,Le Nguyen Truc Nhu,Le Thi Tam Uyen,Pham Thi Nhien,Nguyen Tran Chinh,Nguyen Van Vinh Chau,Jeremy Farrar,H. Rogier van Doorn equal contributor
PLOS Medicine , 2010, DOI: 10.1371/journal.pmed.1000277
Abstract: Background To date, little is known about the initial spread and response to the 2009 pandemic of novel influenza A (“2009 H1N1”) in tropical countries. Here, we analyse the early progression of the epidemic from 26 May 2009 until the establishment of community transmission in the second half of July 2009 in Ho Chi Minh City (HCMC), Vietnam. In addition, we present detailed systematic viral clearance data on 292 isolated and treated patients and the first three cases of selection of resistant virus during treatment in Vietnam. Methods and Findings Data sources included all available health reports from the Ministry of Health and relevant health authorities as well as clinical and laboratory data from the first confirmed cases isolated at the Hospital for Tropical Diseases in HCMC. Extensive reverse transcription (RT)-PCR diagnostics on serial samples, viral culture, neuraminidase-inhibition testing, and sequencing were performed on a subset of 2009 H1N1 confirmed cases. Virological (PCR status, shedding) and epidemiological (incidence, isolation, discharge) data were combined to reconstruct the initial outbreak and the establishment of community transmission. From 27 April to 24 July 2009, approximately 760,000 passengers who entered HCMC on international flights were screened at the airport by a body temperature scan and symptom questionnaire. Approximately 0.15% of incoming passengers were intercepted, 200 of whom tested positive for 2009 H1N1 by RT-PCR. An additional 121 out of 169 nontravelers tested positive after self-reporting or contact tracing. These 321 patients spent 79% of their PCR-positive days in isolation; 60% of PCR-positive days were spent treated and in isolation. Influenza-like illness was noted in 61% of patients and no patients experienced pneumonia or severe outcomes. Viral clearance times were similar among patient groups with differing time intervals from illness onset to treatment, with estimated median clearance times between 2.6 and 2.8 d post-treatment for illness-to-treatment intervals of 1–4 d, and 2.0 d (95% confidence interval 1.5–2.5) when treatment was started on the first day of illness. Conclusions The patients described here represent a cross-section of infected individuals that were identified by temperature screening and symptom questionnaires at the airport, as well as mildly symptomatic to moderately ill patients who self-reported to hospitals. Data are observational and, although they are suggestive, it is not possible to be certain whether the containment efforts delayed community transmission in Vietnam.
Combinatorial characterizations of the saturation and the associated primes of the fourth power of edge ideals
Ha Minh Lam,Ha Thi Thu Hien
Mathematics , 2015,
Abstract: To compute the local cohomology of powers of edge ideals one needs to know their saturations. The saturation of the second and third powers has been described in terms of the graph in [13] and [10]. In this article, we give a combinatorial description of the generators of the saturation of the fourth power. As a consequence, we are able to give a complete classification of the associated primes of the fourth power of edge ideals in terms of the graph.
Antibodies to the Vi capsule of Salmonella Typhi in the serum of typhoid patients and healthy control subjects from a typhoid endemic region
Deborah House1,2, Vo A. Ho4,To S. Diep5, Nguyen T. Chinh6, Phan V. Bay4, Ha Vinh5, Minh Duc4, Christopher M. Parry2,3, Gordon Dougan1, Nicholas J. White2,3, Jeremy J. Farrar2,3, Tran Tinh Hien5, John Wain2,3
Journal of Infection in Developing Countries , 2008,
Abstract: Background: There is very little published data on the antibody response to the Vi capsular polysaccharide (Vi-CPS) of S. Typhi during naturally acquired typhoid fever in an endemic area.Methodology: An indirect ELISA, using tyraminated, purified Vi-CPS, was used to assay anti-Vi-CPS antibodies from typhoid fever cases and controls living in the Ho Chi Minh City and Mekong Delta region of Viet Nam.Results: Antibody response to Vi-CPS is significantly higher in typhoid patients who have been ill for more than two weeks than those who are in the first two weeks of illness. The anti-Vi-CPS response is similar for adults and children. Anti-Vi-CPS antibodies can be detected in the sera of non-typhoid patients. The frequency with which this occurs increases with age, probably reflecting increased exposure to S. Typhi.Conclusions: Anti-Vi_CPS is elicited in persons infected with S. Typhi but only after a prolonged duration of illness. Vaccine trials have shown anti-Vi-CPS antibodies to be protective; thus early treatment of typhoid patients, i.e. in the first two week of illness before the Vi-CPS response is elicited, may inhibit the development of this protective immune response.
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