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2020

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Articles 3991 - 4020 of 10642

Full-Text Articles in Engineering

Image Segmentation Based On Active Contour Derived By Signed Pressure Force Function, Hongli Lü, Renfang Wang Jul 2020

Image Segmentation Based On Active Contour Derived By Signed Pressure Force Function, Hongli Lü, Renfang Wang

Journal of System Simulation

Abstract: Distance regularized level set evolution model for image segmentation has some shortcomings. Initial curve is not flexible and the direction of curve evolution is not self-adaptive. A new active contour model was proposed. A signed pressure force function (SPF) was constructed, integrating local information and global information, and shown to modulate the signs of pressure forces inside and outside the region of object; Then SPF was embed to DRLSE model to solve the problem of requiring the initial contour to surround (let in or keep out) the objects. Experimental results show that the new model's initial contour can be …

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Opnet Simulation Method For Underwater Acoustic Networks Based On Chirp Spread Spectrum, Wencong Li, Yuan Fei, Zhangting Zhong, En Cheng Jul 2020

Opnet Simulation Method For Underwater Acoustic Networks Based On Chirp Spread Spectrum, Wencong Li, Yuan Fei, Zhangting Zhong, En Cheng

Journal of System Simulation

Abstract: Underwater acoustic(UWA) network protocol simulation on OPNET software could not follow the changing of channel structure and did not support custom modulation. In view of the limitations mentioned, a more realistic method of UWA protocol simulation on OPNET was introduced. UWA network ALHOA protocol simulation was token as an example. The physical layer modulation customized was called π/4-DM-DQPSK which was based on Chirp Spread Spectrum. In Matlab, the system would generate a modulation curve which would then be imported into OPNET to adjust the configuration of other pipelines. The simulation results of ALHOA protocol was verified in two Bellhop …

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Boundary Conditions For Model Of Random Kelvin Cell Open-Cell Foam And Its Application On Open-Cell Aluminum Foam, Minju Qi, Guangfa Gao Jul 2020

Boundary Conditions For Model Of Random Kelvin Cell Open-Cell Foam And Its Application On Open-Cell Aluminum Foam, Minju Qi, Guangfa Gao

Journal of System Simulation

Abstract: The random Kelvin cell open-cell foam model, the further investigations on the boundary conditions of the model were carried out using the Python scripting language and the commercial code ABAQUS. The ‘floating' edges in boundary, owing to being cut with slanted planes, were eliminated. The compressive behaviors of the material under free boundary condition and fixed boundary condition were investigated and comparatively analyzed. On the basis of the above results, the periodic boundary condition was developed, and the method of setting the periodic boundary condition under several different conditions was discussed. The methodology for the design and implement for …

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Simulation Study On Mslb Plus Sgtr And Si Failure Process In Reactor Vessel Based On Maap5, Xianrong Wu, Huiming Wei, Xuefeng Su, Wu Fan Jul 2020

Simulation Study On Mslb Plus Sgtr And Si Failure Process In Reactor Vessel Based On Maap5, Xianrong Wu, Huiming Wei, Xuefeng Su, Wu Fan

Journal of System Simulation

Abstract: NPP Main Steam Line Break (MSLB) plus Steam Generator Tube Rupture (SGTR) and Safety Injection (SI) failure is severe accident (SA) process with complex phenomena in reactor vessel. The severe accident process serial was analyzed using the latest version of Modular Accident Analysis Program 5 (MAAP5). The whole trends of the simulation result agreed well with the anticipated process serial, which could provide training material to the full scope simulator and the related evidence to make detailed severe accident management guidelines (SAMG).

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Path Planning And Control Simulation Of Unpowered Unmanned Aerial Vehicle (Uav) Returning To The Airport, Yijun Zhang, Yiqun Dong, Zhan Guang, Jianliang Ai Jul 2020

Path Planning And Control Simulation Of Unpowered Unmanned Aerial Vehicle (Uav) Returning To The Airport, Yijun Zhang, Yiqun Dong, Zhan Guang, Jianliang Ai

Journal of System Simulation

Abstract: The unpowered Unmanned Aerial Vehicle (UAV) return to the airport unpoweredly is a link of large risk and complex technology during the flight, and it is the key stage which affects the flight safety of the UAV. The basic control strategy and path planning of the unpowered UAV's back to the airport were studied, and the method which calculated the average drag of the return was proposed. Under the condition of multiple constraints, the flight control model of the UAV's return was established. It is proved that the result of the simulation is effective and has built a foundation …

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Simulation Of Three Level Inverter Neutral Point Potential Control Based On Three Level Dc/Dc Converter, Kun Xia, Xiaodi Li, Xiaobo Ding, Yanneng Zeng, Yiming Wang, Xu Po Jul 2020

Simulation Of Three Level Inverter Neutral Point Potential Control Based On Three Level Dc/Dc Converter, Kun Xia, Xiaodi Li, Xiaobo Ding, Yanneng Zeng, Yiming Wang, Xu Po

Journal of System Simulation

Abstract: The DC capacitor voltage unbalancing of NPC three-level inverter not only makes the AC output performance worse, but also reduces the DC capacitors' service life and even damages the power devices. A method based on three-level DC/DC converter was put forward to control the neutral point potential of three-level inverter. This method realized power conversion with three-level DC/DC converter topology, boosting voltage and stabilizing the neutral point potential of DC link at the same time. It would regulate switches working states according to the constraint rules on the sum of switches off time deciding bus voltage and the ratio …

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Application Of Recursive Least Square Method In Identication Of Dehydrogenation Reator, Guoyou Li, Ningning Gao, Wenhua Xia Jul 2020

Application Of Recursive Least Square Method In Identication Of Dehydrogenation Reator, Guoyou Li, Ningning Gao, Wenhua Xia

Journal of System Simulation

Abstract: The current production methods of styrene at home and abroad are mainly dhydrogenation of ethylbenzene which accounts for more than 90% of styrene production capacity in the world. To save energy, it was needed to optimize the system and its premise was to know the mathematical model of ethylbenzene dehydrogenation reactor. Due to the complexity of the reactor internal structure, mechanism modeling was more difficult to establish objective and accurate mathematics models. To solve this problem, it was used recursive least squares to conduct parameter identification. On the basis of actual plant data, ethylbenzene dehydrogenation reactor mathematical model was …

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Simulation Research Of Maglev Train During Uphill And Downhill Process, Songqi Li, Kunlun Zhang, Guoqing Liu, Chen Yin Jul 2020

Simulation Research Of Maglev Train During Uphill And Downhill Process, Songqi Li, Kunlun Zhang, Guoqing Liu, Chen Yin

Journal of System Simulation

Abstract: In the low speed EMS maglev test line experiments in Zhuzhou, it was found that vehicles are prone to hit the tracks, when the maglev train travels uphill or downhill through the tracks with slopes. This seriously affected the safety and comfort of the vehicle. In order to study the problem, a single low speed EMS maglev train carriages-track model with four degrees of freedom was built. It simulated and analyzed dynamic behaviors of the vehicle going uphill on different track curves, under different vehicle -track parameters. The simulation results show that the vehicle parameters, vehicle speed, and the …

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Modeling Method Based On Reachable Set For Safety Path In Autonomous Vehicle Obstacle Avoidance, Cao Kai, Xiaoxiao Huang, Yu Yun, Liu Chun Jul 2020

Modeling Method Based On Reachable Set For Safety Path In Autonomous Vehicle Obstacle Avoidance, Cao Kai, Xiaoxiao Huang, Yu Yun, Liu Chun

Journal of System Simulation

Abstract: In view of problem in all possible uncertain behavior of vehicle unable existed by the traditional path planning algorithm, a modeling method was proposed which deemed a moving vehicle as a hybrid system switching dynamically between continuous and discrete mode, modeled an optimal trajectory for vehicle obstacle avoidance by using a single security target location, and built a safe state reachable set based on the trajectory beam of multiple security target locations. On this basis, the condition of the inevitable collision of vehicle was analyzed, and the optimal control problem with loose constraints for the vehicle obstacle avoidance was …

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Numerical Simulation For Influence Of Baffle Length On Hydraulic Characteristics In Radial Sedimentation Tanks, Wenli Wei, Zewei Zhang, Yunfei Hong, Yuling Liu Jul 2020

Numerical Simulation For Influence Of Baffle Length On Hydraulic Characteristics In Radial Sedimentation Tanks, Wenli Wei, Zewei Zhang, Yunfei Hong, Yuling Liu

Journal of System Simulation

Abstract: The VOF (volume of fluid) method was applied to track the free water surface, and the RNG turbulent model was used to close the two-phase flow time-averaged equations. The influence of inlet vertical baffle with different lengths on hydraulic characteristics in radial sedimentation tank was simulated and analyzed. The control equations were discretized using the finite volume method. Velocity and pressure were solved using the PISO (Pressure-Implicit with Splitting of Operators) algorithm. The research results show that: the long length feed flow baffle model has a smaller recirculation zone, better velocity field distribution than short length baffle, and the …

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Research Of Visualization Of Road Guide Sign Panel Based On Combination Of Guiding Information, Zhongming Niu, Huang Min, Yuan Yuan, Li Min Jul 2020

Research Of Visualization Of Road Guide Sign Panel Based On Combination Of Guiding Information, Zhongming Niu, Huang Min, Yuan Yuan, Li Min

Journal of System Simulation

Abstract: In order to realize the intelligent management of road guide signs, a method of visualization of road guide sign panel based on the flexible combination of guiding information was proposed. As a consequence of analysis for structures of guide sign panel, the message on the guide sign panel was decomposed into guiding information, and then visualization function was proposed. The panel style was determined by the physical and logical topology of guiding intersection dynamically with the help of guide sign system database. Then the composition of geography information and guiding information was utilized in the process of visualization …

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Analysis Of Sewer Network For Vijayanagar Layout Of Mysore City, Sankalp Mehta Jul 2020

Analysis Of Sewer Network For Vijayanagar Layout Of Mysore City, Sankalp Mehta

Manipal Institute of Technology, Manipal Theses and Dissertations

The main objective of the study is to design an underground drainage system for the residential layout of the Vijayanagar layout of the Mysore city. Sanitary Sewer Network is an essential part of society. The primary purpose of setting up a sewer system is to transport wastewater (from residential/ industrial area) and stormwater to the treatment plants so that it does not cause any problem to the public health. It was concluded that the Conventional Gravity Sewer System should not be adopted; instead, other technologies like Vacuum Sewer System or Pressure Sewer System should be adopted. A separate treatment plant …

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Field Investigation And Pile Design For Pier 28 Of Bhopal Metro Rail Project, Chetan Nema Jul 2020

Field Investigation And Pile Design For Pier 28 Of Bhopal Metro Rail Project, Chetan Nema

Manipal Institute of Technology, Manipal Theses and Dissertations

Before the start of the construction there are a lot of field investigations and tests that have to be performed on the surface for proper safety and stability of the elementary structure for the Urban Public Transport. The primary goal of any construction process is that the construction should be safe and technically optimized for everyone at every stage since all civil engineering project are done on the surface of the earth, Geotechnical Engineering has to play a very important role in maintaining the safety and security of the structure and hence the people using and constructing the structures. The …

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A Half-Yearly Newsletter Of The Department Of Mechatronics V3 S1 [July 2020], Chandrashekhar Bhat Dr Jul 2020

A Half-Yearly Newsletter Of The Department Of Mechatronics V3 S1 [July 2020], Chandrashekhar Bhat Dr

Faculty work

No abstract provided.

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A Half- Yearly E-Newsletter Of The Department Of Computer Science And Engineering, Manipal Institute Of Technology - Jul 2020, Ashalatha Nayak Jul 2020

A Half- Yearly E-Newsletter Of The Department Of Computer Science And Engineering, Manipal Institute Of Technology - Jul 2020, Ashalatha Nayak

Faculty work

No abstract provided.

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Hyper Attentive Res-Unet For Semantic Segmentation Of Brain Tumors, Dhiraj Maji, Prarthana Sigedar Jul 2020

Hyper Attentive Res-Unet For Semantic Segmentation Of Brain Tumors, Dhiraj Maji, Prarthana Sigedar

Manipal Institute of Technology, Manipal Theses and Dissertations

An abnormal development of tissues in the brain causes brain tumor, hence becoming a notable reason for morbidity and mortality. These tumors do not have a uniform structure and differ with respect to shape, intensity and size in each patient. The radiologists need to diagnose these tumors accurately to decide the best course of treatment for the patients. The manual segmentation requires a lot of expertise and skills, but still sometimes it can be erroneous. However, the automatic segmentation techniques of brain tumors help in precise diagnosis and subsequently devise a proper treatment. We present a new architecture called Hyper-Attentive …

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"Study On The Influence Of Vertical Geometrical Irregularities On The Time Period Of Rc Buildings", Sindhu V. N Jul 2020

"Study On The Influence Of Vertical Geometrical Irregularities On The Time Period Of Rc Buildings", Sindhu V. N

Manipal Institute of Technology, Manipal Theses and Dissertations

Design and build of earthquake resistant building or a structure requires us to understand the building’s response to an earthquake by performing either static or dynamic analysis. Static analysis is preferred for a regular building with more or less equal distribution of mass and stiffness among different floors of a building. The Indian standard code discourages the construction of irregular buildings but when unavoidable the code suggests to use dynamic analysis to understand the seismic response of the building. The construction of buildings with irregularity have become common and inevitable in the present urban scenario owing to space constraints and …

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Barriers To Implementation Of Lean Construction Practices In India, Krishna K. G Jul 2020

Barriers To Implementation Of Lean Construction Practices In India, Krishna K. G

Manipal Institute of Technology, Manipal Theses and Dissertations

Construction Industry is searching for newer and innovative methods to improve its functioning and be more viable in this highly competitive business world. One such technique which has proved its mettle is LEAN CONSTRUCTION. Lean Construction is a hybrid system which has been effectively used in manufacturing fields tweaked to the requirements of construction industry. With the focus of Waste Elimination, Effective utilization of Resources, Controlled activity and monitoring, Collaborative management methodology, implementation of Planning, monitoring and forecasting protocols the implantation has been proved to highly cost effective for the contractor thereby increasing the overall Margin , preventing Cost overruns …

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Construction Of Geopolymer Concrete Road, Ashutosh Rungta Jul 2020

Construction Of Geopolymer Concrete Road, Ashutosh Rungta

Manipal Institute of Technology, Manipal Theses and Dissertations

Geopolymer concrete is fly ash based alkali-activated concrete. Cement is eliminated by using fly ash and ground granulated blast-furnace slag. Water is used only to initiate the polymerization process and has no use after the initiation. The water gets expelled out once the concrete sets. There are no Indian standard codes for the mix design of geopolymer concrete. Hence, NTPC-NETRA and CSIR-Central Building Research Institute, Roorkee, have developed high strength fly ash based geopolymer concrete for the construction of the road as per IRC specifications. A Geopolymer concrete road stretch of 50 m length and 3 m width with 40 …

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Study On Stabilization Of Soil For Wind Turbine Foundation, Bhavana Suresh Jul 2020

Study On Stabilization Of Soil For Wind Turbine Foundation, Bhavana Suresh

Manipal Institute of Technology, Manipal Theses and Dissertations

Geotechnical investigation is carried out to provide necessary information required for designing structures on the soil. In this case, it involves designing foundations for Wind Turbine Generators. Wind Turbines are power generating machines of specified tower heights which consist of Nacelle (encasing gearbox, generators & transformers) and Hub holding the blades which rotate upon experiencing the wind action at the designated height to convert kinetic energy (wind) to electrical energy. This project is aimed at analyzing the soil conditions and check for the suitability of foundations designed for the designated WTG model. Previously, when the soil properties are identified to …

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Selective Inventory Management For A High Rise Residential Project, Mridul Nijhawan Jul 2020

Selective Inventory Management For A High Rise Residential Project, Mridul Nijhawan

Manipal Institute of Technology, Manipal Theses and Dissertations

The primary goal of any construction project is to ensure that good quality work is done at an optimized price. The cost of construction materials accounts for the majority of the expenses; therefore we need to have strict and viable control at these material expenses. To accomplish these objectives, we need to have strict screening and controlling of the material costs, quality and quantity requirements as per prerequisites of the task in the project. These instruments help in controlling material expenses and the quality and quantity of the material and guaranteeing the sufficient amount of material required at the site. …

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"Analysis And Design Of Multi-Storeyed Building Using Staad Pro", Sidharth . Jul 2020

"Analysis And Design Of Multi-Storeyed Building Using Staad Pro", Sidharth .

Manipal Institute of Technology, Manipal Theses and Dissertations

High Rise Building have to be designed with more flexibility. There is more chance of external excitation as these Structures are Vulnerable to Earthquake and wind. To protect these structures from such structural damages, seismic response factor is analyzed and the building is designed according to the results obtained. STAAD-Pro analysis is used. Limit State Design conforming to IS Code of Practice is adopted for design. The Primary Objective of this work is to create a structure that is earthquake resistant, using STAAD-PRO analysis.Also designing the components of the structure manually & Using excel program for the results obtained from …

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Planning, Analysis & Design Of A G+2 Residential Rcc Building, Path Sharma Jul 2020

Planning, Analysis & Design Of A G+2 Residential Rcc Building, Path Sharma

Manipal Institute of Technology, Manipal Theses and Dissertations

Concrete is the second most used material by man after water. It is used in nearly every type of construction. The most common use of concrete is in construction of a residential building. This project involves the planning, analysis & design of a RCC building. In earlier days, building design was done by hand, using manual calculations and hand drafting. It would take several days and even months for an architect to design, for an engineer to analyze & for a drafter to detail the various components. But today most of the work is done with the help of software …

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Understanding And Analyzing Major Activities Involved In The Construction Of Skyscraper, Rachit Pamecha Jul 2020

Understanding And Analyzing Major Activities Involved In The Construction Of Skyscraper, Rachit Pamecha

Manipal Institute of Technology, Manipal Theses and Dissertations

As the population of world increases at an unprecedented rate so does their basic need of a shelter. This would lead to an acute shortage of land for everyone to fit in and skyscrapers help us overcome this problem very efficiently. The main reason that people build skyscrapers is because they are very convenient. They serve to fit a lot of floor space in a comparatively small amount of ground surface because of their immense height. This project deals with the construction techniques and methodology required to overcome the difficulties faced during the construction of skyscrapers. It also provides data …

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Analysis And Prediction Of Peak Surface Runoff Of Bda Planning District-215 Mathikere, Bengaluru North, Sridarshan H. S Jul 2020

Analysis And Prediction Of Peak Surface Runoff Of Bda Planning District-215 Mathikere, Bengaluru North, Sridarshan H. S

Manipal Institute of Technology, Manipal Theses and Dissertations

Runoff plays a very important role in modern urban planning. When authorities consider various developmental infrastructure and services, runoff is one important factor to be considered in the planning phase to do away with the ill effects of runoff in a future time period. Runoff can be defined as the amount of water due to rainfall that makes its way through rooftops, pavements, roads and open ground finally to form streams. These streams due to excess runoff may result in catastrophic disasters like landslides, collapse of infrastructure, etc. The determination of amount of runoff was calculated using the combine efforts …

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Inter-Slice Compression And Reconstruction Of Glioma Magnetic Resonance Imaging (Mri) Data Using Encoder-Decoder Neural Networks, Gavin Michael Karr Jul 2020

Inter-Slice Compression And Reconstruction Of Glioma Magnetic Resonance Imaging (Mri) Data Using Encoder-Decoder Neural Networks, Gavin Michael Karr

Graduate Theses - Electrical and Computer Engineering

Magnetic Resonance Imaging (MRI) scans of patients with brain tumors are an important source of pre-surgical medical information. These three-dimensional image volumes can be represented as a stack of two-dimensional image slices. The objective of this thesis is to compress the size of these image volumes by removing the odd-numbered slices and reconstruct the image volume using an encoder-decoder convolutional neural network. This neural network architecture is based on a modified form of the U-net segmentation network, which has been adjusted to allow for multiple image inputs and to support a network capable of generating new image slices. A novel …

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Interdisciplinary Education Outreach With Traffic Sensor Build Kits, Sarah V. Hernandez, Mariah B. Crews Jul 2020

Interdisciplinary Education Outreach With Traffic Sensor Build Kits, Sarah V. Hernandez, Mariah B. Crews

Civil Engineering Teaching and Learning

The goal of this project was to attract K-12 students to transportation engineering careers through STEM outreach programs. To accomplish this goal, the object of the project was to design and implement maritime freight oriented educational outreach activities centered on traffic sensing technologies for middle, high school, and first-year college students. In MarTREC Project 5011 (Evaluating the Performance of Intermodal Connectors), the research team designed a low-cost, easily implementable LiDAR and Bluetooth sensor bundle that was capable of detecting, characterizing, and tracking freight trucks as they traveled to and from inland waterway port areas. The sensor provided data necessary to …

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Western Kentucky University Stormwater Utility Survey 2020, Warren Campbell Jul 2020

Western Kentucky University Stormwater Utility Survey 2020, Warren Campbell

SEAS Faculty Publications

No abstract provided.

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A Data-Driven Approach For Winter Precipitation Classification Using Weather Radar And Nwp Data, Bong Chul Seo Jul 2020

A Data-Driven Approach For Winter Precipitation Classification Using Weather Radar And Nwp Data, Bong Chul Seo

Civil, Architectural and Environmental Engineering Faculty Research & Creative Works

This study describes a framework that provides qualitative weather information on winter precipitation types using a data-driven approach. The framework incorporates the data retrieved from weather radars and the numerical weather prediction (NWP) model to account for relevant precipitation microphysics. To enable multimodel-based ensemble classification, we selected six supervised machine learning models: k-nearest neighbors, logistic regression, support vector machine, decision tree, random forest, and multi-layer perceptron. Our model training and cross-validation results based on Monte Carlo Simulation (MCS) showed that all the models performed better than our baseline method, which applies two thresholds (surface temperature and atmospheric layer thickness) for …

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Ultrasonic Coda Wave Comparison For Quality Control Of Manufactured Parts: Proof Of Feasibility, Alexei Marin-Cortes Jul 2020

Ultrasonic Coda Wave Comparison For Quality Control Of Manufactured Parts: Proof Of Feasibility, Alexei Marin-Cortes

Civil and Environmental Engineering Master's Project Reports

Manufactured parts are a staple of modern urban life, visible in homes (e.g., kitchen appliances), offices (e.g., printers), the automobile and aerospace industries (e.g., body parts), and more. This M.S. project intended to determine whether ultrasonic testing could be used in a simple and rapid manner to perform quality control of manufactured parts. Ultrasonic testing is employed for this purpose using two surface-coupled transducers, one being a transmitter and the other one a receiver. An ultrasonic pulse, which is generated by the transmitting transducer, propagates through the part, collecting information about material and geometry, as well as potential unwanted features. …

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