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Articles 56401 - 56430 of 198169

Full-Text Articles in Engineering

Simulation Model Of Crowd Following Phenomenon In Emergencies, Fang Hao, Liu Zhen, Lu Tao, Liangping Liu, Tingting Liu, Cuijuan Liu Aug 2020

Simulation Model Of Crowd Following Phenomenon In Emergencies, Fang Hao, Liu Zhen, Lu Tao, Liangping Liu, Tingting Liu, Cuijuan Liu

Journal of System Simulation

Abstract: Researches on crowd behavior in emergent events are important practical significance for emergency management, most of the current crowd models are collision detection, motion plan and so on. According to the emergency scene analysis of surveillance video, following behaviors of crowd are obviously, modeling following behaviors is an interesting topic in crowd simulation. A following model was proposed based on classical social force model and OCEAN personlity theory, the concept of panic was introduced,, and following conditions of individual was set up, the speed formulas of individual were constructed. Experimental results show that the following model can closely simulate …

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Real-Time Rendering Of Large-Scale Coastal Water Based On Adaptive Optimization, Shunli Wang, Fengju Kang, Jianhua Xu Aug 2020

Real-Time Rendering Of Large-Scale Coastal Water Based On Adaptive Optimization, Shunli Wang, Fengju Kang, Jianhua Xu

Journal of System Simulation

Abstract: Focusing on the complex of the wave model and the poor performance of real-time in the large-scale coastal water visualization, a new method based on adaptive optimization for coastal water rendering in real-time was proposed. By introducing the automatic merging algorithm, the complex wave model could be constructed. According to the collision detection technology, the water mesh could be adaptively optimized. In order to improve the realistic, a noise was added to the water surface. The foam and reflection were realized by applying the dynamic texture mapping technology. The experimental results show that the generated coastal water has higher …

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Advances In Research And Application Of In-Situ Visualization, Wang Fang, Sikun Li, Zhao Dan, Zeng Liang Aug 2020

Advances In Research And Application Of In-Situ Visualization, Wang Fang, Sikun Li, Zhao Dan, Zeng Liang

Journal of System Simulation

Abstract: Scientific-Visualization is the most effective means of analyzing numerical simulation data. With the continuous improvement of the high performance computing technology, numerical simulation scale is growing rapidly. It is very difficult to analyze large scale parallel numerical simulation data efficiently due to the limits of IO bandwidth, storage system capacity and post processing pattern of visualization. In-situ visualization utilized the same computer system that ran the simulation tasks to operate visual computing and rendering, so it could overcome the limits of IO and storage system. The advances of in-situ visualization in recent years were reviewed, including data management, large-scale …

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Functional Characterization Of Petiolule-Like Pulvinus (Plp) Gene In Abscission Zone Development In Medicago Truncatula And Its Application To Genetic Improvement Of Alfalfa, Juan Du, Shaoyun Lu, Maofeng Chai, Chuanen Zhou, Liang Sun, Yuhong Tang, Jin Nakashima, Jaydeep Kolape, Zhaozhu Wen, Marjan Behzadirad, Tianxiu Zhong, Juan Sun, Yunwei Zhang, Zeng-Yu Wang Aug 2020

Functional Characterization Of Petiolule-Like Pulvinus (Plp) Gene In Abscission Zone Development In Medicago Truncatula And Its Application To Genetic Improvement Of Alfalfa, Juan Du, Shaoyun Lu, Maofeng Chai, Chuanen Zhou, Liang Sun, Yuhong Tang, Jin Nakashima, Jaydeep Kolape, Zhaozhu Wen, Marjan Behzadirad, Tianxiu Zhong, Juan Sun, Yunwei Zhang, Zeng-Yu Wang

Nebraska Center for Biotechnology: Faculty and Staff Publications

Alfalfa (Medicago sativa L.) is one of the most important forage crops throughout the world. Maximizing leaf retention during the haymaking process is critical for achieving superior hay quality and maintaining biomass yield. Leaf abscission process affects leaf retention. Previous studies have largely focused on the molecular mechanisms of floral organ, pedicel and seed abscission but scarcely touched on leaf and petiole abscission. This study focuses on leaf and petiole abscission in the model legume Medicago truncatula and its closely related commercial species alfalfa. By analysing the petiolule-like pulvinus (plp) mutant in M. truncatula at phenotypic level …

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A Framework For Simulating And Analyzing Multi-Uav Persistent Search And Retrieval With Stochastic Target Appearance, Ryan David Day Aug 2020

A Framework For Simulating And Analyzing Multi-Uav Persistent Search And Retrieval With Stochastic Target Appearance, Ryan David Day

Theses and Dissertations

In recent years, advances in small unmanned aerial vehicle (UAV) technology have transformed the use cases of these aircraft from hobby flying to industrial and business applications. These maneuverable, easily deployed tools can be retrofitted with a myriad of sensors and equipment, which make them suitable to perform a variety of specialized tasks. With increasing UAV capabilities, the function of small UAVs can be extended from pure monitoring or surveillance to the dual objective of monitoring an environment for events and addressing the events in some way. This thesis seeks to explore a subdomain of the dual objective problem described, …

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Sparse Representation Based Private Face Recognition In The Cloud, Liu Yan, Jin Xin, Zhao Geng, Xiaodong Li, Yingya Chen, Guo Kui Aug 2020

Sparse Representation Based Private Face Recognition In The Cloud, Liu Yan, Jin Xin, Zhao Geng, Xiaodong Li, Yingya Chen, Guo Kui

Journal of System Simulation

Abstract: In order to protect user privacy, identification computing of user facial image data in the cloud was accomplished, the sparse representation based private face recognition method in the cloud was proposed. Terminal users collected face images and compared with face images in cloud database and then determined whether faces the terminal acquired belonged to the cloud face database, but both could not achieve each other's face image content. The method processed face images in database and cloud into sparse representation via a third-party terminal, then using Paillier and oblivious transfer homomorphic encryption algorithm to contrast sparse representation coefficient vector …

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Design And Realization Of Optimization System For Rice Type, Weilong Ding, Lifeng Xu, Wei Yang, Gao Nan Aug 2020

Design And Realization Of Optimization System For Rice Type, Weilong Ding, Lifeng Xu, Wei Yang, Gao Nan

Journal of System Simulation

Abstract: It is widely accepted that in traditional crop ideotype breeding, field trials are time-consuming, yet lacking appropriate ways to evaluate the target morphology to be optimal. In order to obtain ideal crop plant type quickly and automatically, meanwhile to reduce the side effects caused by manual operations in the processes of plant type design, e.g. the growing of labor costs and uncertainty of the outcome, a method based on genetic algorithms (GAs) and functional-structural plant model (FSPM) was proposed in this study to optimize plant type of virtual rice by dynamically adjusting phenotypical traits of rice plants. Based on …

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3d Reconstruction Of Weak Texture Image Based On Tensor Voting And Dense Map Method, Mingwei Chen, Yang Yang Aug 2020

3d Reconstruction Of Weak Texture Image Based On Tensor Voting And Dense Map Method, Mingwei Chen, Yang Yang

Journal of System Simulation

Abstract: Image based 3D reconstruction method can't effectively detect and match feature points and can't robustly expand 3D point cloud in weak texture image region, due to the fact that weak texture has single color and local reflection phenomenon. It is possible to produce model hole and a large number of 3D noise points, and affect the accuracy and integrity of 3D reconstruction. Slack variables constraint was used to filter mismatch features optimizing the camera matrix, in the dense point cloud expansion stage by using tensor voting principle to filter noise 3d point which is inconsistent with three-dimensional point's normal …

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Development And Performance Assessment Of An Integrated Vermifiltration Based Treatment System For The Treatment Of Feedlot Runoff, Rajneesh Singh, Matteo D'Alessio, Yulie Meneses, Shannon L. Bartelt-Hunt, Brian Woodbury, Chittaranjan Ray Aug 2020

Development And Performance Assessment Of An Integrated Vermifiltration Based Treatment System For The Treatment Of Feedlot Runoff, Rajneesh Singh, Matteo D'Alessio, Yulie Meneses, Shannon L. Bartelt-Hunt, Brian Woodbury, Chittaranjan Ray

Nebraska Water Center: Faculty Publications

The objective of this study was to treat feedlot runoff by developing an ecologically sustainable, affordable, and resilient treatment system having a relatively long life span. Three horizontal flow soil biofilters were utilized in this study: 1) without earthworms and plants (Biofilter (BF)), 2) with earthworms only (Vermifilter (VF)), and 3) with earthworms and plants (Macrophyte Assisted Vermifilter (MAVF)). The experiments were conducted with a hydraulic retention time of four days using Lumbricus terestrris earthworms and Carex frankii wetland plants. The average COD removal from the BF, VF, and MAVF were 23.2–30.4%, 61.4–69.1%, and 68.3–78.1%, respectively. Average TN removal efficiencies …

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Potential Energy Generation From Agricultural Residue In Indonesia, Adrian Rizqi Irhamna Aug 2020

Potential Energy Generation From Agricultural Residue In Indonesia, Adrian Rizqi Irhamna

International Programs

Indonesia has great potential of biomass sources from their agricultural residue, which can potentially be used for alternative energy generation. This preliminary research explores the most suitable technology for energy generation from agricultural residue and its challenge for application in Indonesia. The study showed that biomass utilization via the direct combustion process is recommended for energy generation. It is also reported that the pretreatment process of drying and washing, are required to increase the fuel quality and plant efficiency.

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Applying Renewable Energies Against Climate Change: Solar Photovoltaic (Pv) Energy, Juan Jose Estribi Aug 2020

Applying Renewable Energies Against Climate Change: Solar Photovoltaic (Pv) Energy, Juan Jose Estribi

International Programs

In recent years, more efforts towards fighting climate change have been done. As a direct response, research and technology have offered several insights regarding the specific causes, effects, and even possible solutions for resolving this global issue. Among these solutions, renewable energies and their potential contributions as clean energy sources can be assessed as feasible options for the energy transformation through the decarbonization process of the energy industry. This poster is mainly focused on solar photovoltaic (PV) energy and its great potential as a renewable energy by making a brief assessment of some important aspects such as resource availability, its …

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How Can 5g Make Our Lives Better?, Firas Slewa Dawod Aug 2020

How Can 5g Make Our Lives Better?, Firas Slewa Dawod

International Programs

Our lives will be significantly improved with the advent of the new cellular wireless technology due to all its new features and applications. This Poster discusses the main features and application of 5G technology and its positive impact on society, in particular facilitating interactive and smart communities.

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Ensuring A Safety Workplace By The Automation Of The Ammonia Cooling System, Luis Felipe Cordoba Aug 2020

Ensuring A Safety Workplace By The Automation Of The Ammonia Cooling System, Luis Felipe Cordoba

International Programs

Ammonia presents high efficiency in freezing food products for preserving them for exportation; however, the use of this refrigerant implies a high risk to human life because it presents high concentrations of toxic gases that can produce deadly consequences to human beings. Smart relays present a flexible manner to automate industrial process; therefore, this poster aims to replace the manual and inefficient manner of controlling ammonia cooling system by using a smart relay that can control the levels of this refrigerant in the precooler and cooler section; resulting in considerable decrease workers’ in exposure to this refrigerant.

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The Influence Of Surface Types Towards Run-Off Water In Urban Park, Febby Andini Aug 2020

The Influence Of Surface Types Towards Run-Off Water In Urban Park, Febby Andini

International Programs

Pavements in Alun Kapuas Park constribute 63 of run off water over the capacity of the soil to infiltrate. This water will potentially causes the flooding and puddling issues.

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What Are The Advantages Of Replacing Fossil Fuels With Biofuels?, Amr Shaalan Aug 2020

What Are The Advantages Of Replacing Fossil Fuels With Biofuels?, Amr Shaalan

International Programs

Fossil fuels’ negative impact on the environment is leading many people to worry In addition to that, fossil fuels are running out as every day goes by. Thus, finding a renewable and environmentally friendly source of energy has now become a necessity. Biofuels offer clean energy that comes with numerous economic and environmental benefits. Furthermore, biofuels can absorb more carbon from the air than they would produce when burnt. Giving a chance to clear the air from fossil fuel’s carbon.

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Future Trends In Construction Waste Management, Zaur Zeynalov Aug 2020

Future Trends In Construction Waste Management, Zaur Zeynalov

International Programs

The problem of construction waste has been with us since the beginning of construction history. As the world's population continues to grow, construction waste grows with it and there is a pressing need to address how we deal with the construction waste problem As a result, the whole world is facing the problem of "construction waste management" today. This poster describes current challenges managing construction waste and offers possible solutions to minimize/mitigate/ameliorate its (negative) effects on the environment.

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Hail Detection Using Dual Polarization Weather Radar, Alfonso Ladino Rincon Aug 2020

Hail Detection Using Dual Polarization Weather Radar, Alfonso Ladino Rincon

International Programs

This poster highlights how active remote sensors such as weather radar are completely useful for hail detection given its feature and the information they produce. Hail detection is already well studied by the atmospheric scientific community and dual polarimetric variables values for hail signature are presented according to those advances. Then, a supervised classification technique is showed to illustrated how machine learning can be integrated to radar information for automatic hail detection. However, this fuzzy logic algorithm has the capability to distinguish between meteorological and non-meteorological echoes. This automatic information might help forecasters from National Weather Services – NWS to …

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Indonesian Library User Behaviour During Covid 19 Pandemic On Digital Library Platform, Irhamni Aug 2020

Indonesian Library User Behaviour During Covid 19 Pandemic On Digital Library Platform, Irhamni

International Programs

COVID-19 pandemic has significantly changed library user behavior, workplaces, and some public areas including in the library. During the COVID 19 pandemics, the digital library with a mobile app like ipusnas has facilitated to accessing library resources. The ipusnas has increased people's accessibility to library materials. This research focuses on the use of the digital library has a significant impact on library users behavior; it can influence how they read, access the library, and their interaction with the library resources.

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Advanced Solid-State Lithium Batteries For Electric Vehicles, Yelsin Mendez Camacho Aug 2020

Advanced Solid-State Lithium Batteries For Electric Vehicles, Yelsin Mendez Camacho

International Programs

Solid-state lithium batteries (SSLBs) may have the potential to safe and long-distance driving in electric-vehicles (EV). […] However, manufacturing processes and new materials need to be developed to make these batteries commercially available.

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Improving Energy Efficiency In Residential Houses In Kosovo, Fatlum Rexhepi Aug 2020

Improving Energy Efficiency In Residential Houses In Kosovo, Fatlum Rexhepi

International Programs

Buildings with poor insulation and infiltration in doors, windows, and other openings have very high heating and cooling demands. Due to lack of maintenance, building materials, and standard they are whopping consumers. The necessity to save energy is enormous, especially with newly environmental constrains. Moreover, this would not only save our natural resources, but it would cut large sums that households spend on electricity, gas, or coal. Thermodynamic calculation of heat gain and loss gave us a lucid picture of benefits respecting nearly zero energy buildings standards while comparing same building prior and after improving its envelope. The consumption after …

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Morphodynamics Of Transgressive Coastal Systems: Modeling Allogenic And Autogenic Response To Sea Level Rise, Storms, And Changes In Sediment Supply, Kevin C. Hanegan Aug 2020

Morphodynamics Of Transgressive Coastal Systems: Modeling Allogenic And Autogenic Response To Sea Level Rise, Storms, And Changes In Sediment Supply, Kevin C. Hanegan

LSU New Orleans Theses and Dissertations

Barrier islands are widespread and typically enclose landward basins connected to the ocean through tidal inlets. Low energy in the basin enables fine sediment accumulation and salt marsh formation. Sea Level Rise (SLR) causes loss of marshes due to their low elevations and inundation sensitivity. Both long-term trends in sediment supply due to SLR and episodic transfers of sediment due to storms are important to the sustainability of marshes and tidal basins. The trajectory of deltas, including the Mississippi River Delta (MRD), are also impacted by sediment supply. The redistribution of sediments (autogenic reorganization) within transgressive systems will determine their …

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Experimental Investigation Into The Boundary Layer Of A Robotic Anguilliform Propulsor, Jonathan R. Eastridge Aug 2020

Experimental Investigation Into The Boundary Layer Of A Robotic Anguilliform Propulsor, Jonathan R. Eastridge

LSU New Orleans Theses and Dissertations

Boundary layer information local to three longitudinal positions has been characterized for a 130 cm long biomimetic self-propulsor known as NEELBOT-1.1 that swims with undulatory anguilliform-like motions, via analysis of stereo particle image velocimetry (PIV) measurements for key moments in the undulation cycle and for numerous combinations of swimming conditions and motion parameters, ideal and non-ideal. No obvious turbulent flow structures or indications of boundary layer separation were observed at nonzero advance speeds, and skin friction coefficients were subsequently estimated for magnitude relative to the dynamic pressure associated with operation at the design swimming speed of Uo = 0.25 …

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Recent Advances In Hydrothermal Carbonisation: From Tailored Carbon Materials And Biochemicals To Applications And Bioenergy, Sabina A. Nicolae, Heather Au, Pierpaolo Modugno, Hui Luo, Anthony E. Szego, Mo Qiao, Liang Li, Wang Yin, Hero J. Heeres, Nicole Berge, Maria Magdalena Titirici Aug 2020

Recent Advances In Hydrothermal Carbonisation: From Tailored Carbon Materials And Biochemicals To Applications And Bioenergy, Sabina A. Nicolae, Heather Au, Pierpaolo Modugno, Hui Luo, Anthony E. Szego, Mo Qiao, Liang Li, Wang Yin, Hero J. Heeres, Nicole Berge, Maria Magdalena Titirici

Faculty Publications

Introduced in the literature in 1913 by Bergius, who at the time was studying biomass coalification, hydrothermal carbonisation, as many other technologies based on renewables, was forgotten during the "industrial revolution". It was rediscovered back in 2005, on the one hand, to follow the trend set by Bergius of biomass to coal conversion for decentralised energy generation, and on the other hand as a novel green method to prepare advanced carbon materials and chemicals from biomass in water, at mild temperature, for energy storage and conversion and environmental protection. In this review, we will present an overview on the latest …

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The Applications Of Auxetic Material, Faizal Arifurrahman Aug 2020

The Applications Of Auxetic Material, Faizal Arifurrahman

International Programs

To date, increasing structural efficiency has become a main objective in material science and engineering. One focus is an auxetic material with a unique characteristic obtained by fabricating cellular forms. With its higher strength-to-weight ratio, auxetic is becoming popular in the real-world to produce products that are light but more durable. This study examines potential application of auxetic compared to that of conventional material.

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Synthetic Aperture Radar Signal Simulation Of Ships On Sea Surface, Guijie Diao, Xiaojian Xu, Ni Hong, Junjie Lu Aug 2020

Synthetic Aperture Radar Signal Simulation Of Ships On Sea Surface, Guijie Diao, Xiaojian Xu, Ni Hong, Junjie Lu

Journal of System Simulation

Abstract: A synthetic aperture radar (SAR) signal simulation method for ship targets on sea surface was proposed and the SAR signature model was established. The ship six degrees freedom motion model, the sea surface complex reflection coefficient model and the target electromagnetic scattering model were introduced. Based on the high frequency electromagnetic scattering calculation method and multi-path electromagnetic scattering, the electromagnetic coupling scattering and the time-varying characteristics were simulated. By comparing and analyzing the imaging results of the simulated SAR signal in different states, the physical scattering characteristics of ship targets on sea surface was realistically reflected, at the same …

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Discrete-Event Simulation-Engine Technology Based On Mailbox-Mechanism In C4Isr System, Wendi Cheng, Fengxin Sun, Chu Wei Aug 2020

Discrete-Event Simulation-Engine Technology Based On Mailbox-Mechanism In C4Isr System, Wendi Cheng, Fengxin Sun, Chu Wei

Journal of System Simulation

Abstract: For the design of discrete event simulation engine about combat simulation platform tools in C4ISR System, discrete events were divided into several types according to the C4ISR System's functional components and operational deduction process. The advantage of centralized management and convenient access was made use of by the mechanism of sending and receiving emails in mailbox to support the circulation of discrete events. Besides, the fixed-step driven and event-driven discrete event engine strategies were compared and analyzed. The result shows that, discrete event-driven clock algorithm, which can greatly reduce the consumed machine-time in simulation, is more applicable at …

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Semi-Physical Simulation System Research For Marine Fuel Oil Purifier, Zhang Ning, Zhipeng Shen, Jizhong Liu, Haiwei Wang Aug 2020

Semi-Physical Simulation System Research For Marine Fuel Oil Purifier, Zhang Ning, Zhipeng Shen, Jizhong Liu, Haiwei Wang

Journal of System Simulation

Abstract: Practical training in ship fuel oil purifier systems have lots of limitations including poor stability, development difficulties and high maintenance cost. A semi-physical simulation system for marine fuel oil purifier was proposed. According to the real ship control box, a fuel oil purifier control box was designed. A process simulation system was developed to simulate the fuel oil tube and purifier function, which could achieve the working process of purifier system and the phenomenon of fault alarm. The simulation system can reappear the working process of the oil purifier and simulate the fault conditions to improve the …

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Mufti-Model Soft Modeling Based On Clustering In Evaporation Process, Peng Chen, Xiaoshan Qian Aug 2020

Mufti-Model Soft Modeling Based On Clustering In Evaporation Process, Peng Chen, Xiaoshan Qian

Journal of System Simulation

Abstract: Based on the idea approach based on multi-model with a stronger robustness and precision, combining with strong coupling and the highly nonlinear characteristics in multi-effect evaporation process, a soft sensor modeling method of fuzzy kernel clustering was proposed based on differential evolution and multi-squares support vector machines. The method made clustering samples under different conditions by use of DE-KFCM, each sub-models were constructed using LSSVM using fuzzy clustering algorithm to cluster the input data under different conditions, and finally get the system output by weighting. Taking alumina evaporation process as an example, for the soft sensor modeling of export …

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Calculation Of Vessel's Geometric Properties Based On Stl Model, Chunlei Liu, Yin Yong, Xiaofeng Sun, Xiufeng Zhang Aug 2020

Calculation Of Vessel's Geometric Properties Based On Stl Model, Chunlei Liu, Yin Yong, Xiaofeng Sun, Xiufeng Zhang

Journal of System Simulation

Abstract: To improve the accuracy of the ship geometric properties calculation and the real-performance of the program, a method based on STL triangular mesh model was proposed to calculate the ship geometric properties. SH polygon clipping algorithm in computer graphics was used to calculate the intersection of ship and water plane. By using of coordinates systems affine transformation, 3D water plane was changed to 2D plane to extract the profile contour. Because the waterlines are monotone polygon, Mass center insertion method was proposed to finish polygon triangulation, computing speed was improved. Bulk carrier "Taihang 128" was taken as an …

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Salient Region Detection Based On Object-Biased Gaussian Refinement And Global Contrast, Cai Qiang, Ziyu Xue, Dianhui Mao, Haisheng Li Aug 2020

Salient Region Detection Based On Object-Biased Gaussian Refinement And Global Contrast, Cai Qiang, Ziyu Xue, Dianhui Mao, Haisheng Li

Journal of System Simulation

Abstract: In view of the disadvantages such as the incomplete detection in image boundary which is caused by the global contrast significance detection algorithm, a visual saliency detection algorithm was proposed named salient region detection based on object-biased Gaussian refinement and global contrast. After segmentation based on graph, the global contrast was used to calculate the saliency value of each segmentation blocks. According to the location of the salient object, the center of the Gaussian model was adjusted. Both saliency detection value and Gaussian model combined effect of the final saliency values. The method paid attention to the …

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