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Search Results: 1 - 10 of 4108 matches for " Fue-Sang Lien "
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Bootstrapped Multi-Model Neural-Network Super-Ensembles for Wind Speed and Power Forecasting  [PDF]
Zhongxian Men, Eugene Yee, Fue-Sang Lien, Hua Ji, Yongqian Liu
Energy and Power Engineering (EPE) , 2014, DOI: 10.4236/epe.2014.611029
Abstract: The bootstrap resampling method is applied to an ensemble artificial neural network (ANN) approach (which combines machine learning with physical data obtained from a numerical weather prediction model) to provide a multi-ANN model super-ensemble for application to multi-step-ahead forecasting of wind speed and of the associated power generated from a wind turbine. A statistical combination of the individual forecasts from the various ANNs of the super-ensemble is used to construct the best deterministic forecast, as well as the prediction uncertainty interval associated with this forecast. The bootstrapped neural-network methodology is validated using measured wind speed and power data acquired from a wind turbine in an operational wind farm located in northern China.
Journal of Engineering Science and Technology , 2010,
Abstract: Early experimental work, conducted at Defence R&D Canada–Suffield, measured and characterized the personal and environmental contamination associated with simulated anthrax-tainted letters under a number of different scenarios in order to obtain a better understanding of the physical and biological processes for detecting, assessing, and formulating potential mitigation strategies for managing the risks associated with opening an anthrax-tainted letter. These experimental investigations have been extended in the present study to simulate numerically the contamination from the opening of anthrax-tainted letters in an open office environment using computational fluid dynamics (CFD). A quantity of 0.1 g of Bacillus atropheus (formerly referred to as Bacillus subtilis var globigii (BG)) spores in dry powder form, which was used here as a surrogate species for Bacillus anthracis (anthrax), was released from an opened letter in the experiment. The accuracy of the model for prediction of the spatial distribution of BG spores in the office from the opened letter is assessed qualitatively (and to the extent possible, quantitatively) by detailed comparison with measured BG concentrations obtained under a number of different scenarios, some involving people moving within the office. The observed discrepancy between the numerical predictions and experimental measurements of concentration was probably the result of a number of physical processes which were not accounted for in the numerical simulation. These include air flow leakage from cracks and crevices of the building shell; the dispersion of BG spores in the Heating, Ventilation, and Air Conditioning (HVAC) system; and, the effect of deposition and re-suspension of BG spores from various surfaces in the office environment.
Parallel Adaptive Mesh Refinement Combined with Additive Multigrid for the Efficient Solution of the Poisson Equation
Hua Ji,Fue-Sang Lien,Eugene Yee
ISRN Applied Mathematics , 2012, DOI: 10.5402/2012/246491
Parallel Adaptive Mesh Refinement Combined with Additive Multigrid for the Efficient Solution of the Poisson Equation
Hua Ji,Fue-Sang Lien,Eugene Yee
ISRN Applied Mathematics , 2012, DOI: 10.5402/2012/246491
Abstract: Three different speed-up methods (viz., additive multigrid method, adaptive mesh refinement (AMR), and parallelization) have been combined in order to provide a highly efficient parallel solver for the Poisson equation. Rather than using an ordinary tree data structure to organize the information on the adaptive Cartesian mesh, a modified form of the fully threaded tree (FTT) data structure is used. The Hilbert space-filling curve (SFC) approach has been adopted for dynamic grid partitioning (resulting in a partitioning that is near optimal with respect to load balancing on a parallel computational platform). Finally, an additive multigrid method (BPX preconditioner), which itself is parallelizable to a certain extent, has been used to solve the linear equation system arising from the discretization. Our numerical experiments show that the proposed parallel AMR algorithm based on the FTT data structure, Hilbert SFC for grid partitioning, and additive multigrid method is highly efficient. 1. Introduction Although an unstructured mesh is highly flexible for dealing with very complex geometries and boundaries [1], the discretization schemes used for these types of meshes (usually in conjunction with control-volume-based finite element methods) are generally much more cumbersome than those used for structured meshes. In particular, the data structure used by an unstructured mesh requires information on “forming points’’ that are needed to describe the (arbitrary) shape and location of the faces of control volumes where the conservation laws need to be satisfied and to define the adjacent neighbors for each of these control volumes through an appropriate connectivity matrix. These types of operations require generally indirect memory referencing, and, as a consequence, efficient matrix solvers widely used for structured meshes cannot be easily adapted for unstructured meshes. In view of this, computational methods based on unstructured meshes are generally computationally less efficient than those based on structured meshes, particularly those that use a Cartesian grid. In order to utilize the computational efficiency afforded by a Cartesian structured grid while retaining the flexibility and accuracy in the discretization process required to address problems involving complex geometries and large ranges in spatial scales, adaptive mesh refinement (AMR) can be applied to focus the computational effort and memory usage where it is required for the accurate representation of the solution at minimal cost. There are two main approaches that have been developed
Remote Scheduling System for Drip Irrigation System Using Geographic Information System  [PDF]
Kadeghe G. Fue, Camilius Sanga
Journal of Geographic Information System (JGIS) , 2015, DOI: 10.4236/jgis.2015.75044
Abstract: The Internet is widely accessible in Tanzania. Most of the technologies used in different organizations have changed to address their functions using web based information systems. In this paper, attempt is made to design software system using geographical information system (GIS) for the spatial and temporal distribution of irrigation supply for large-scale drip irrigation systems in Tanzania. Map based information system has gained popularity after evolution of simple tools to present spatial information using Internet. Due to water scarcity, it is envisioned that by 2050 the world won’t have enough water for communities, industries and agriculture. Web based precision irrigation system refers to deployment of remotely precision irrigation services using the application interface that connects to the Internet. Hence, this study presents the GIS in the context of precision farming to achieve precision irrigation strategy with special reference to precision farming of tea in Tanzania. The GIS-based irrigation scheduling system was designed for the scheduling daily drip irrigation water deliveries and regular monitoring of irrigation delivery performance for maximum yield. The “Scheduling” program computes the right amount of irrigation deliveries based on tea water requirements. The “Monitoring” program gives information on the uniformity of water distribution and the shortfall or excess.
Indoor Air Quality Measurement with the Installation of a Rooftop Turbine Ventilator  [PDF]
Jason Lien, Noor Ahmed
Journal of Environmental Protection (JEP) , 2012, DOI: 10.4236/jep.2012.311166
Abstract: The present paper presents a numerical analysis of the difference in comfort level inside a room of a residential building when roof top turbine ventilator is installed. This analysis simulates various comfort factors which includes the indoor air movement, room temperature, Predicted Mean Vote (PMV) and Predicted Percentage of Dissatisfied (PPD). Various test cases of ventilator exhaust rate were examined. The results showed that general comfort satisfying international standards in building can be achieved. This study also presents a qualitative and quantitative study of indoor air temperature and overall indoor air flow pattern. A promising conclusion that can be drawn from this study is that wind driven ventilators can play an important role in the design of a cost effective and energy efficient ventilation system inside a building.
Microstructure of Plasma Sprayed Al2O3-3wt%TiO2 Coating Using Freeze Granulated Powder  [PDF]
Yiming Yao, Ola Lyckfeldt, Aurélien Tricoire, Aurélien Tricoire
Journal of Materials Science and Chemical Engineering (MSCE) , 2016, DOI: 10.4236/msce.2016.47002

This study is aiming at controlling the microstructure of plasma sprayed Al2O3-TiO2 composite coatings using freeze granulated powders. As sprayed and sintered Al2O3 + 3wt%TiO2 powders were air plasma sprayed with industry process parameters and compared with a commercial powder. The resulting coatings were investigated with respect to powder flowability, porosity and microstructure of the granules. The results showed that microstructure and melting fraction in the coatings could be tailored with the freeze granulation process and heat treatment conditions.

Characteristics of Corrosion Product Layer Formed on Weathering Steel Exposed to the Tropical Climate of Vietnam  [PDF]
Le Thi Hong Lien, Hoang Lam Hong
Materials Sciences and Applications (MSA) , 2013, DOI: 10.4236/msa.2013.47A1002

The weathering steel (Corten B) was exposed to out-door atmosphere of Hanoi (urban site) and Donghoi (marine site). The results showed the protective ability of corrosion product layer formed on weathering steel in the initial stage. The SEM-EDX analysis detected the presence of chromium and copper in the inner layers of corrosion product formed on weathering steel. These elements improved corrosion resistance of corrosion product layers. In addition, the dense α-FeOOH phase were appeared early in corrosion product which is detected by X-ray diffraction and Micro Raman investigations. The results of polarization and EIS measurements also demonstrated the protectiveness of the corrosion product of weathering steel.

An Evaluation of Destination Management Systems in Madagascar with Aspect of Tourism Sector  [PDF]
Daré Aurélien, Rakotonirina Jeremy Desiré
American Journal of Industrial and Business Management (AJIBM) , 2014, DOI: 10.4236/ajibm.2014.49057
Abstract: This paper describes the Destination Management Systems (DMS). Madagascar is a developing country in Africa and has a big population. Madagascar is one of the beautiful countries with its attractive beautiful scenery. These sceneries, lakes and beaches of Madagascar always attract travelers from all over the world to come to Madagascar to enjoy the nature, so a portion of this paper discusses about the tourism sector of Madagascar. No doubt Madagascar is gaining some money from tourism sector, but it can be increased if there can be a strong DMS for the traveler. The overall Destination Management Systems (DMS) and tourism sector of Madagascar have been discussed in this paper. As per conclusion, we can say DMS could increase visitor traffic, attract the right market segment with the provision of an accurate and up to date comprehensive electronic database. DMS also supports the wide distribution of destination information online. DMS can also help to create more efficient internal and external networks, which can have long-term positive effects on the local economy in achieving competitiveness.
Endoscopic Third Ventriculostomy for Non-Tumor Obstructive Hydrocephalus in Children under Two Years of Age  [PDF]
Aurélien Ndoumbé, Mathieu Motah, Samuel Takongmo
Open Journal of Modern Neurosurgery (OJMN) , 2015, DOI: 10.4236/ojmn.2015.53017
Abstract: The goal of this work is to report on the efficacy of endoscopic third ventriculostomy (ETV) for non-tumor obstructive hydrocephalus in children aged two years and below. In the period between June 2007 and December 2014, we had performed ETV in 30 patients with hydrocephalus from diverse etiologies. Among them were eight children aged two years or below. Clinical, radiological and outcome data of these children were retrospectively reviewed to assess ETV efficiency in this age group. Eight children (6 boys, 2 girls) with age range from 6 to 24 months (mean 12.5 months, median 15 months) suffering from non-tumor obstructive hydrocephalus underwent ETV as primary treatment. Seven patients (87.5%) were under two years and 3 had less than one year of age at the time of surgery. Macro crania, suture diastasis, scalp vein bulging and sunset gaze were the most common findings on physical examination. Computed tomography scanning was done in all patients but none had magnetic resonance imaging. Hydrocephalus was due to primary (congenital) aqueductal stenosis in all cases and was associated with myelomeningocele in one. ETV was successful in 7 (87.50%) cases but failed in one. Operation time varied from 28 to 35 minutes (mean 31.12 minutes, median 31.5 minutes). No intraoperative complication occurred. The child in whom ETV failed had postoperative CSF leak. No death related to procedure occurred. Hospital stay ranged from 2 to 4 days (mean, 2.87 days, median, 3 days). Follow up range was 5.5 to 86 months (0.46 to 7.16 years); mean, 59.14 months (4.92 years); median, 45.75 months (3.81 years).
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