Papers by van anh tran phu le
arXiv (Cornell University), May 6, 2015
The problem of optimizing distributed database includes: fragmentation and positioning data. Seve... more The problem of optimizing distributed database includes: fragmentation and positioning data. Several different approaches and algorithms have been proposed to solve this problem. In this paper, we propose an algorithm that builds the initial equivalence relation based on the distance threshold. This threshold is also based on knowledge-oriented clustering techniques for both of horizontal and vertical fragmentation. Similarity measures used in the algorithms are the measures developed from the classical measures. Experimental results carrying on the small data set match fragmented results based on the classical algorithm. Execution time and data fragmentation significantly reduced while the complexity of our algorithm in the general case is stable.
Tập san Khoa học và kỹ thuật trường Đại học Bình Dương
This article points to look for the proper methodologies for financial institutionsin Vietnam wit... more This article points to look for the proper methodologies for financial institutionsin Vietnam within the consequence of Covid-19 widespread. Inside an interesting setting,the widespread has coincidently made formative chances for money related issues. Beneaththis circumstance along the quickening handle of computerized change, this article appearsthat monetary educate should concentrate on research and advancement for human capitaland innovation within the post-pandemic period. Such techniques are anticipated toencourage successful competition in terms of item contrasts and ideal costs as well asmaintainable improvement based on budgetary, clientele, handling, and preparingcomponents.
Technical solutions to resources allocation for distributed virtual machine systems
Virtual machine is built on group of real servers which are scattered globally and connect togeth... more Virtual machine is built on group of real servers which are scattered globally and connect together through the telecommunications systems, it has an increasingly important role in the operation, providing the ability to exploit virtual resources. The latest technique helps to use computing resources more effectively and has many benefits, such as cost reduction of power, cooling and, hence, contributes to the Green Computing. To ensure the supply of these resources to demand processes correctly and promptly, avoiding any duplication or conflict, especially remote resources, it is necessary to study and propose a reliable solution appropriate to be the foundation for internal control systems in the cloud. In the scope of this paper, we find a way to produce efficient distributed resources which emphasizes solutions preventing deadlock and proposing methods to avoid resource shortage issue. With this approach, the outcome result is the checklist of re-sources state which has the poss...
Combination of conjugated polyelectrolytes and biomolecules: A new optical platform for highly sensitive and selective chemo- and biosensors
Macromolecular Research, 2014
AbstractConjugated polyelectrolytes (CPEs) have been studied extensively as the optical platform ... more AbstractConjugated polyelectrolytes (CPEs) have been studied extensively as the optical platform for chemo- and biosensor applications with high sensitivity by virtue of their light harvesting effect. A range of fluorescent CPEsbased sensing schemes have been developed by utilizing fluorescence quenching via photo-induced electron transfer and fluorescence resonance energy transfer, etc. Highly sensitive and selective detection assays can be realized by combining the tunable optical properties of synthetic CPEs with specific binding characteristics of biomolecules (such as aptamer, antibody, protein, etc.). This article reviews the range of fluorescence-based optical assays with the CPEs-biomolecule complex as a signaling platform with in situ detection, remarkable sensitivity and selectivity, etc.
Effects of Core/Wall Ratio and Inlet Temperature on the Retention of Antioxidant Compounds during the Spray Drying of Sim (R hodomyrtus tomentosa ) Juice
Journal of Food Processing and Preservation, 2015
ABSTRACT
Algorithmic approach to deadlock detection for resource allocation in heterogeneous platforms
2014 International Conference on Smart Computing, 2014
ABSTRACT An allocation of resources to a virtual machine specifies the maximum amount of each ind... more ABSTRACT An allocation of resources to a virtual machine specifies the maximum amount of each individual element of each resource type that will be utilized, as well as the aggregate amount of each resource of each type. An allocation is thus represented by two vectors, a maximum elementary allocation vector and an aggregate allocation vector. There are more general types of resource allocation problems than those we consider here. In this paper, we present an approach for improving parallel deadlock detection algorithm, to schedule the policies of resource which supply for resource allocation in heterogeneous distributed platform. Parallel deadlock detection algorithm has a run time complexity of O(min(m,n)), where m is the number of resources and n is the number of processes. We propose the algorithm for allocating multiple resources to competing services running in virtual machines on a heterogeneous distributed platform. The experiments also compare the performance of the proposed approach with other related work.
Importance of live three-dimensional transoesophageal echocardiography in the early recognition of an asymptomatic but extensive annular and left ventricular outflow track rupture following transcatheter aortic valve replacement
European Heart Journal - Cardiovascular Imaging, 2014
Excellent Outcomes for Transcatheter Aortic Valve Replacement Within 1 Year of Opening a Low-Volume Centre and Consideration of Requirements
Canadian Journal of Cardiology, 2014
After the approval of transcatheter aortic valve replacement (TAVR) for high-risk or inoperable p... more After the approval of transcatheter aortic valve replacement (TAVR) for high-risk or inoperable patients with severe aortic stenosis (AS), many low- and moderate-volume TAVR programs were initiated. Contemporary outcomes from these newly initiated centres remain unknown. In March 2013, our institution was authorized by the Québec Ministry of Health to perform 30 TAVR procedures. After thorough clinical screening and imaging evaluation, suitable patients underwent transfemoral TAVR with the balloon-expandable SAPIEN XT (Edwards Lifesciences, Irvine, CA) transcatheter heart valve (THV). In-hospital and 30-day outcomes were prospectively collected and reported according to Valve Academic Research Consortium 2 guidelines. From April 2013 to January 2014, 30 consecutive high-risk (n = 16 [53.3%]) or inoperable (n = 14 [46.7%]) patients (mean age, 84.6 years; mean Society of Thoracic Surgery score, 7) with symptomatic severe AS underwent transfemoral TAVR. No catastrophic intraprocedural complications such as annulus rupture, valve embolization, aortic dissection, or coronary occlusion occurred, and there were no deaths at 30 days. Disabling stroke occurred in 1 (3.3%) patient 48 hours after THV implantation. Major vascular complications and major bleeding occurred in 1 (3.3%) patient. No moderate or severe paravalvular leak was observed. The median length of stay was 2 (1-3) days, with 8 (26.7%) patients discharged within 24 hours after the procedure. Excellent outcomes can be achieved in newly initiated relatively low-volume centres, which compares favorably to previously published large series. Important considerations include appropriate team training, rigorous patient screening, use of multimodality imaging techniques, a heart team approach, constant integration of lessons learned from larger published experiences, and maintaining a recommended minimum volume of 25 cases per year.
Monkey Pulvinar Neurons Fire Differentially to Snake Postures
PLoS ONE, 2014
Dynamic Role Assignment for Large-Scale Multi-Agent Robotic Systems
Studies in Computational Intelligence, 2010
2009 21st IEEE International Conference on Tools with Artificial Intelligence, 2009
Exploration of an unknown environment is one of the major applications of Multi-Robot Systems. Ma... more Exploration of an unknown environment is one of the major applications of Multi-Robot Systems. Many works have proposed multi-robot coordination algorithms to accomplish exploration missions based on multi-agent techniques. Some of these works focus on multi-robot exploration under communication constraints. In this paper, we propose an original way to formalize and solve this issue. Our proposal relies on distributed constraint satisfaction problems (disCSP) which are an extension of classical constraint satisfaction problems (CSP). Compared to other works, our proposal is fully distributed and guaranties the exploration of an unknown environment with maintenance of connectivity between all the members of a robots' team.
Making networked robots connectivity-aware
2009 IEEE International Conference on Robotics and Automation, 2009
2009 IEEE-RIVF International Conference on Computing and Communication Technologies, 2009
Maintaining the Network Connectivity in Mobile Multi-Robot Systems (MRSs) is a key issue in many ... more Maintaining the Network Connectivity in Mobile Multi-Robot Systems (MRSs) is a key issue in many robotics applications. In our view, the solution to this problem consists of two steps: (i) making robots aware of the network connectivity; and (ii), making use of this knowledge in order to plan robots tasks without compromising the connectivity. We propose a novel distributed algorithm that will be executed on individual robots to make robot be aware of the network connectivity (i). We also rigorously formalize the problem of checking the robustness of a wireless network based on the conception of Connectivity-Awareness. The algorithm featured with very low communication overhead in comparison with existing works.
Effectiveness of hairpin probe in increasing the limit of detection for gold nanowire based-biosensor
Advances in Natural Sciences: Nanoscience and Nanotechnology, 2014
ABSTRACT Electrochemical DNA (E-DNA) sensors, which are rapid, reagentless and readily integrated... more ABSTRACT Electrochemical DNA (E-DNA) sensors, which are rapid, reagentless and readily integrated into microelectronics and microfluidics, appear a promising alternative to optical methods for the detection of specific nucleic acid sequences. In keeping with this, a large number of distinct E-DNA architectures have been reported to date. Most, however, suffer from one or more drawbacks, including low signal gain, signal-off behavior or instability. To remedy these problems, we report here the development of a signal-on E-DNA architecture that achieves both high signal gain and good stability. This new sensor employs a commercially synthesized, asymmetric hairpin DNA as its recognition and signaling probe, the shorter arm of which is labeled with a redox reporting methylene blue at its free end. Unlike all prior E-DNA architectures, in which the recognition probe is attached via a terminal functional group to its underlying electrode, the probe employed here is affixed using a thiol group located internally, in the turn region of the hairpin. Hybridization of a target DNA to the longer arm of the hairpin displaces the shorter arm, allowing the reporter to approach the electrode surface and transfer electrons. The observed signal gain is sufficient to achieve a demonstrated detection limit of 25 pM.
2009 IEEE International Workshop on Safety, Security & Rescue Robotics (SSRR 2009), 2009
The global climate change induces an increase, in terms of frequency and devastating power, of na... more The global climate change induces an increase, in terms of frequency and devastating power, of natural disasters (particularly in developing countries). For facing this, there is a growing need for robotic assistance, for collecting information, managing disaster situation, rescuing victims and preserve human lives. It is one of the means recommended by the UNPD (United Nations Program for Development), which consist in the deployment of onfield automated monitoring, surveillance and reconnaissance systems. This paper outlines the research performed in the AROUND (Autonomous Robots for Observation of Urban Networks after Disasters) project. This project addresses the issue of developing a search and rescue multi-robot systems taking into account specific constraints of developing countries.
Advances in Natural Sciences: Nanoscience and Nanotechnology, 2012
Using an irreducible design we experimentally and numerically study a perfect metamaterial absorb... more Using an irreducible design we experimentally and numerically study a perfect metamaterial absorber, providing excellent absorption at microwave frequencies. The impact of geometric parameters on the absorption is also investigated. The experimental and the simulated results are in good agreement. Finally, we propose a polarization-insensitive absorber for the improvement.
Nanoscale Research Letters, 2013
Silica powder at nanoscale was obtained by heat treatment of Vietnamese rice husk following the s... more Silica powder at nanoscale was obtained by heat treatment of Vietnamese rice husk following the sol–gel method. The rice husk ash (RHA) is synthesized using rice husk which was thermally treated at optimal condition at 600°C for 4 h. The silica from RHA was extracted using sodium hydroxide solution to produce a sodium silicate solution and then precipitated by adding H2SO4 at pH = 4 in the mixture of water/butanol with cationic presence. In order to identify the optimal condition for producing the homogenous silica nanoparticles, the effects of surfactant surface coverage, aging temperature, and aging time were investigated. By analysis of X-ray diffraction, scanning electron microscopy, and transmission electron microscopy, the silica product obtained was amorphous and the uniformity of the nanosized sample was observed at an average size of 3 nm, and the BET result showed that the highest specific surface of the sample was about 340 m2/g. The results obtained in the mentioned meth...
Ratiometric Fluorescent Ion Detection in Water with High Sensitivity via Aggregation-Mediated Fluorescence Resonance Energy Transfer Using a Conjugated Polyelectrolyte as an Optical Platform
Macromolecular Rapid Communications, 2013
A cationic conjugated polyelectrolyte was designed and synthesized based on poly(fluorene-co-phen... more A cationic conjugated polyelectrolyte was designed and synthesized based on poly(fluorene-co-phenylene) containing 5 mol% benzothiadiazole (BT) as a low energy trap and 15-crown-5 as a recognizing group for potassium ions. A potassium ion can form a sandwich-type 2:1 Lewis acid-based complex with 15-crown-5, to cause the intermolecular aggregation of polymers. This facilitates inter-chain fluorescence resonance energy transfer (FRET) to a low-energy BT segment, resulting in fluorescent signal amplification, even at dilute analyte concentrations. Highly sensitive and selective detection of K(+) ions was demonstrated in water. The linear response of ratiometric fluorescent signal as a function of [K(+) ] allows K(+) quantification in a range of nanomolar concentrations with a detection limit of ≈0.7 × 10(-9) M.
Effect of Crude Oil Aging on Asphaltene Inhibitor Product Recommendation
Journal of Dispersion Science and Technology, 2011
Aging refers to the deterioration of hydrocarbon fluids that manifests as changes in the physico-... more Aging refers to the deterioration of hydrocarbon fluids that manifests as changes in the physico-chemical characteristics of the fluid upon exposure to ambient conditions. In order to understand the effect of aging of crude oils on asphaltene inhibitor product recommendation, simulated aging studies were performed on a crude oil from Wyoming with known asphaltene issues. The results clearly show that
Discrete Applied Mathematics, 2003
Two graphs G and H with the same vertex set V are P4-isomorphic if there exists a permutation on ... more Two graphs G and H with the same vertex set V are P4-isomorphic if there exists a permutation on V such that, for all subsets S ⊆ V; S induces a chordless path on four vertices (denoted by P4) in G if and only if (S) induces a P4 in H. This paper gives a characterization of all graphs P4-isomorphic to a bipartite graph, which we call bipartite-perfect graphs. The characterization is based on graphs P4-isomorphic to a tree previously described by A. Brandst adt and the author, and implies a linear time recognition algorithm for bipartite-perfect graphs.
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Papers by van anh tran phu le