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Title: Letters from George Benson, 1787.
Creator: Benson, George
Abstract/Description: Two handwritten letters to Sir George Yonge, British Secretary of War
PURL: http://purl.flvc.org/fau/fd/fauwdlb2f32
Format: Document (PDF)

Scholar's name: Yan Yong
Department: Department of Civil, Environmental and Geomatics Engineering
Status: Current
Email: yongy@fau.edu
Format: Institutional Scholar

Title: Dynamic response of plate structures to external excitations.
Creator: Mani, George., Florida Atlantic University, Yong, Yan, College of Engineering and Computer Science, Department of Ocean and Mechanical Engineering
Abstract/Description: The dynamic response of plate structures composed of rigidly connected thin plates subjected to point loads is studied. The finite strip method combined with a new approach for analyzing periodic structures is utilized to obtain substantial reduction in computational efforts. Each strip with various boundary conditions is treated as a waveguide capable of transmitting different wave motions. Wave scattering matrices are defined to characterize wave motions at boundaries, intersection of...
Show moreThe dynamic response of plate structures composed of rigidly connected thin plates subjected to point loads is studied. The finite strip method combined with a new approach for analyzing periodic structures is utilized to obtain substantial reduction in computational efforts. Each strip with various boundary conditions is treated as a waveguide capable of transmitting different wave motions. Wave scattering matrices are defined to characterize wave motions at boundaries, intersection of plates and where type of wave guides are changed. The results obtained from the application of the approach on various plate configurations are presented and discussed.
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Date Issued: 1990
PURL: http://purl.flvc.org/fcla/dt/14661
Subject Headings: Plates (Engineering)--Vibration, Finite strip method, Structural analysis (Engineering)
Format: Document (PDF)

Title: Response analysis of structures including effects of soil-structure interaction.
Creator: Yu, Jun., Florida Atlantic University, Yong, Yan, College of Engineering and Computer Science, Department of Ocean and Mechanical Engineering
Abstract/Description: The objective of the study is to determine the structural response to external force and earthquake excitations with consideration of soil-structure interaction. The physical model concerned herein is an N-story building on a rigid or flexible foundation embedded in a layered soil medium. In this substructure approach, the soil medium and the structure are treated as one-dimensional waveguides and their motions are characterized as wave scattering. To include effects of soil-structure...
Show moreThe objective of the study is to determine the structural response to external force and earthquake excitations with consideration of soil-structure interaction. The physical model concerned herein is an N-story building on a rigid or flexible foundation embedded in a layered soil medium. In this substructure approach, the soil medium and the structure are treated as one-dimensional waveguides and their motions are characterized as wave scattering. To include effects of soil-structure interaction, the foundation response is expressed as a summation of influence functions, which are defined as the response to a simple stress distribution over the contact surface between the soil and foundation. The analysis, therefore, is carried out without solving integral equations. The coupling effect is recovered by using equilibrium, compatibility and reciprocal conditions. As a result, the structural response solution is expressed in terms of parameters of a seismic source and external excitations, and can be used in a statistical analysis if uncertainties of these parameters are taken into account.
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Date Issued: 1995
PURL: http://purl.flvc.org/fcla/dt/12425
Subject Headings: Soil-structure interaction, Earthquake engineering, Structural dynamics, Foundations
Format: Document (PDF)

Title: TWO DIMENSIONAL FLOW WITHIN A TRIANGULAR OSCILLATING CRACK (TURBULENCE, VORTEX STREET, TRANSITION FLOW, MIXING).
Creator: KIM, SOO YONG., Florida Atlantic University, Tennant, Jeffrey S., College of Engineering and Computer Science, Department of Ocean and Mechanical Engineering
Abstract/Description: The transition of two dimensional flow within a crack with oscillating wall is studied experimentally to establish the role of the parameters involved. Multiple instabilities in the fluid are produced by the motion of the oscillating wall. For a better understanding of the flow structure and displaying in the whole flow field at a time, flow visualization was used. Frequency, amplitude, and crack width were systematically varied. The present study shows that, in general, the frequency and...
Show moreThe transition of two dimensional flow within a crack with oscillating wall is studied experimentally to establish the role of the parameters involved. Multiple instabilities in the fluid are produced by the motion of the oscillating wall. For a better understanding of the flow structure and displaying in the whole flow field at a time, flow visualization was used. Frequency, amplitude, and crack width were systematically varied. The present study shows that, in general, the frequency and crack width play a role in the transition process at low frequencies of oscillations. However, amplitude becomes progressively important at its higher range. Results also show that the flow changes its character approximately after a Reynolds number 11420. After that the transition process continues until the Reynolds number 34322 which is the upper limit of variation of frequency (Reynolds number) in the present study.
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Date Issued: 1986
PURL: http://purl.flvc.org/fcla/dt/14312
Subject Headings: Fluid dynamics, Flow visualization
Format: Document (PDF)

Title: An analytical study of a bridge system for underway replenishment.
Creator: Douplitzky, Karine Franci., Florida Atlantic University, Yong, Yan
Abstract/Description: A folding span deployed between two ships is proposed for dry cargo transfer during replenishment operations at sea. This structure is modeled as a one-dimensional truss-work, composed of spatially periodic units. The governing equation is formulated for a single periodic unit by a finite element method. A transfer matrix method is then used to connect it to its neighboring units. The dynamic response of the structure is finally obtained by a wave propagation approach. For application to...
Show moreA folding span deployed between two ships is proposed for dry cargo transfer during replenishment operations at sea. This structure is modeled as a one-dimensional truss-work, composed of spatially periodic units. The governing equation is formulated for a single periodic unit by a finite element method. A transfer matrix method is then used to connect it to its neighboring units. The dynamic response of the structure is finally obtained by a wave propagation approach. For application to underway replenishment (UNREP), this analysis is extended to the case of a travelling load and to the case of moving boundaries, which accounts for the relative motion of the supplying and receiving ships. Moreover, a parametric study is conducted for future design purpose.
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Date Issued: 1989
PURL: http://purl.flvc.org/fcla/dt/14518
Subject Headings: Cargo handling--Equipment, Bridges, Truss, Loading and unloading
Format: Document (PDF)

Title: Free and random vibrations of shells of revolution with interior supports.
Creator: Xia, Zhiyong., Florida Atlantic University, Yong, Yan, College of Engineering and Computer Science, Department of Ocean and Mechanical Engineering
Abstract/Description: A new analytical method based on the wave propagation scheme has been developed for the dynamic analysis of axially symmetric shells with arbitrary boundary conditions and interior supports. In this approach, a shell structure is considered as a waveguide and the response to external excitations is treated as a superposition of wave motions. To segregate the effect of the interior supports, the waveguide is first divided into several sub-waveguides. Upon analyzing these sub-waveguides...
Show moreA new analytical method based on the wave propagation scheme has been developed for the dynamic analysis of axially symmetric shells with arbitrary boundary conditions and interior supports. In this approach, a shell structure is considered as a waveguide and the response to external excitations is treated as a superposition of wave motions. To segregate the effect of the interior supports, the waveguide is first divided into several sub-waveguides. Upon analyzing these sub-waveguides separately, a composition scheme is adopted to relate them by connecting the wave components according to the continuity conditions for the state variables at each interior supports. Closed form solutions for free and random vibration are derived. The proposed method is presented in a general fashion and numerical examples are given to illustrate the application of the theory.
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Date Issued: 1990
PURL: http://purl.flvc.org/fcla/dt/14659
Subject Headings: Shells (Engineering)--Vibration, Wave guides
Format: Document (PDF)

Title: Lifeline structures under earthquake excitations.
Creator: Reddy, Kondakrindhi Praveen., Florida Atlantic University, Yong, Yan, College of Engineering and Computer Science, Department of Ocean and Mechanical Engineering
Abstract/Description: An analytical method is proposed for the response analysis of lifeline structures subjected to earthquake excitations. The main feature of the approach is to consider the vibrational motion as a result of the wave motion in a waveguide-like lifeline structure. Based on the theory of wave propagation, scattering matrices are derived to characterize the wave propagation in individual segments and wave reflections and transmissions at supports and boundaries. Response solution is derived in a...
Show moreAn analytical method is proposed for the response analysis of lifeline structures subjected to earthquake excitations. The main feature of the approach is to consider the vibrational motion as a result of the wave motion in a waveguide-like lifeline structure. Based on the theory of wave propagation, scattering matrices are derived to characterize the wave propagation in individual segments and wave reflections and transmissions at supports and boundaries. Response solution is derived in a closed form, suitable for stochastic analysis when the input is an earthquake excitation. A space-time earthquake ground motion model that accounts for both coherent decay and seismic wave propagation is used to specify motions at supports. The proposed technique can be used to obtain lifeline structural response accurately and determine the correlation between any two locations in an effective manner. The computational aspects of its implementation are also discussed. Numerical examples are presented to illustrate the application and efficiency of the proposed analytical scheme.
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Date Issued: 1993
PURL: http://purl.flvc.org/fcla/dt/14898
Subject Headings: Artificial intelligence, Fuzzy logic, Neural networks (Computer science), Pavements--Skid resistance
Format: Document (PDF)

Title: A structural analysis of the rigging system for an ocean racing yacht.
Creator: Troy, R. Talbot., Florida Atlantic University, Yong, Yan, College of Engineering and Computer Science, Department of Ocean and Mechanical Engineering
Abstract/Description: A static analysis of the rigging structure for Matador, an 80-ton ocean racing yacht, is performed, and the results are compared to load cell data taken during close haul sailing. The purpose of the analysis is to examine the nature of the loading of the shrouds when heeling, backstay cylinder adjustment and runner tensions are considered. Also, the relative rotation between the shrouds and their joints and possibilities of bending stresses developed by friction are discussed. The sail forces...
Show moreA static analysis of the rigging structure for Matador, an 80-ton ocean racing yacht, is performed, and the results are compared to load cell data taken during close haul sailing. The purpose of the analysis is to examine the nature of the loading of the shrouds when heeling, backstay cylinder adjustment and runner tensions are considered. Also, the relative rotation between the shrouds and their joints and possibilities of bending stresses developed by friction are discussed. The sail forces acting on the mast are calculated with simple foil theory to estimate sail lift coefficients and drag angles. The heeling angle is considered so that weight of mast and rigging is accounted for. The adjustment of the backstay cylinder is simulated by displacement of the lower end of the backstay, and the runner tensions are modeled as point loads on the mast.
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Date Issued: 1990
PURL: http://purl.flvc.org/fcla/dt/14624
Subject Headings: Masts and rigging, Yachts and yachting--Models
Format: Document (PDF)

Title: Thickness and weld profile effects upon the fatigue crack development in sea water.
Creator: Li, Yong., Florida Atlantic University, Hartt, William H., College of Engineering and Computer Science, Department of Ocean and Mechanical Engineering
Abstract/Description: This research investigated the plate thickness and weld profile effects upon fatigue of structural steel in sea water. Specific attention was focused on the initiation and propagation behavior of fatigue cracks formed at the toe of different profiled welds and varied plate thicknesses. It was shown that the initiation life was reduced as the thickness increased. The improved weld profile increased the crack initiation life. Analysis of the fatigue data indicated that the Initiation Life to...
Show moreThis research investigated the plate thickness and weld profile effects upon fatigue of structural steel in sea water. Specific attention was focused on the initiation and propagation behavior of fatigue cracks formed at the toe of different profiled welds and varied plate thicknesses. It was shown that the initiation life was reduced as the thickness increased. The improved weld profile increased the crack initiation life. Analysis of the fatigue data indicated that the Initiation Life to Failure Life Ratio Ni/Nf appeared to be greater for the improved weld profile than for the AWS Basic weld profile. The improved weld profile prolonged the propagation life Np. The thickness factor influenced the propagation life Np for the improved weld profile, but the trend was uncertain for the basic weld profile.
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Date Issued: 1989
PURL: http://purl.flvc.org/fcla/dt/14532
Subject Headings: Steel, Structural--Fatigue
Format: Document (PDF)

Title: ARIAL PHOTOGRAMMETRY AND LIDAR POINT CLOUD REGISTRATION USING DEEP LEARNING.
Creator: Mandal, Anil Kumar, Yong, Yan, Su, Hongbo, Florida Atlantic University, Department of Civil, Environmental and Geomatics Engineering, College of Engineering and Computer Science
Abstract/Description: This research develops a new pipeline for large-scale point cloud registration by integrating chunked-based data processing within feature-based deep learning models to align aerial LiDAR and UAV photogrammetric data. By processing data in manageable chunks, this approach optimizes memory usage while retaining the spatial continuity essential for precise alignment across expansive datasets. Three models—DeepGMR, FMR, and PointNetLK—were evaluated within this framework, demonstrating the...
Show moreThis research develops a new pipeline for large-scale point cloud registration by integrating chunked-based data processing within feature-based deep learning models to align aerial LiDAR and UAV photogrammetric data. By processing data in manageable chunks, this approach optimizes memory usage while retaining the spatial continuity essential for precise alignment across expansive datasets. Three models—DeepGMR, FMR, and PointNetLK—were evaluated within this framework, demonstrating the pipeline’s robustness in handling datasets with up to 49.73 million points. The models achieved average epoch times of 35 seconds for DeepGMR, 112 seconds for FMR, and 333 seconds for PointNetLK. Accuracy in alignment was also reliable, with rotation errors averaging 2.955, 1.966, and 1.918 degrees, and translation errors at 0.174, 0.191, and 0.175 meters, respectively. This scalable, high-performance pipeline offers a practical solution for spatial data processing, making it suitable for applications that require precise alignment in large, cross-source datasets, such as mapping, urban planning, and environmental analysis.
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Date Issued: 2024
PURL: http://purl.flvc.org/fau/fd/FA00014538
Subject Headings: Deep learning (Machine learning), Photogrammetry, Three-dimensional modeling
Format: Document (PDF)

Title: Rational study of incompressible turbulent flows.
Creator: Pu, Xiaoyan., Florida Atlantic University, Yong, Yan, College of Engineering and Computer Science, Department of Ocean and Mechanical Engineering
Abstract/Description: A new turbulence model is proposed in this dissertation for two-dimensional incompressible turbulent flows. The methodology used in the present study is a unilateral-statistical-average scheme with the concept of orthotropic eddy viscosity. This methodology has never been explored before in any research work of this nature. The distinguished feature of the unilateral-statistical-average scheme, compared to Reynolds averaging, is that the first-order information of the fluctuating velocity...
Show moreA new turbulence model is proposed in this dissertation for two-dimensional incompressible turbulent flows. The methodology used in the present study is a unilateral-statistical-average scheme with the concept of orthotropic eddy viscosity. This methodology has never been explored before in any research work of this nature. The distinguished feature of the unilateral-statistical-average scheme, compared to Reynolds averaging, is that the first-order information of the fluctuating velocity field is retained. This is achieved by dividing the fluctuating velocities into two groups and applying the average only to a single group. It is proved that the mean value of the fluctuating velocities of the first group solutions is not equal to zero. This non-zero quantity, together with a specified length vector, is used to define a 3 x 3 matrix of orthotropic eddy viscosity. In an off-streamline coordinate system, the eddy-viscosity matrix exhibits anisotropy characteristic, where each component of the turbulent stresses is related to all the components of the rate of strains of the mean fluid flow. The present model has been successfully applied to turbulent boundary-layer flow, turbulent free-shear jet flow, and turbulent wall-bounded separation flow without using empirical constants or wall-functions. Good agreements between the numerical results and experimental data or empirical predictions demonstrate that the unilateral-statistical-average scheme and the orthotropic non-linear eddy-viscosity formulation are robust and efficient in modeling basic turbulent flows. Applicability and predictability of the model to more complex engineering turbulence problems are worthy of further investigation in the future research.
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Date Issued: 1999
PURL: http://purl.flvc.org/fcla/dt/12610
Subject Headings: Turbulence--Mathematical models, Turbulent boundary layer--Mathematical models
Format: Document (PDF)

Title: Information systems management and outsourcing: A study of American city governments.
Creator: Kim, Yong-Mi, Florida Atlantic University, Thai, Khi V.
Abstract/Description: An information system is defined as "a system that uses information technology to capture, transmit, store, retrieve, manipulate, or display information used in one or more business processes" (Alter, 1996, p. 61). The use of information systems (IS) in local governments has dramatically increased and diversified over the past ten years. Because IS expenditures are expected to increase, IS management will be a key issue in city governments. In order to explore IS management and outsourcing in...
Show moreAn information system is defined as "a system that uses information technology to capture, transmit, store, retrieve, manipulate, or display information used in one or more business processes" (Alter, 1996, p. 61). The use of information systems (IS) in local governments has dramatically increased and diversified over the past ten years. Because IS expenditures are expected to increase, IS management will be a key issue in city governments. In order to explore IS management and outsourcing in American city governments, three theoretical perspectives and three models are employed. The three theoretical perspectives influencing IS outsourcing are (1) economic factors, (2) diffusion of innovation, and (3) organizational factors. The three models focus on three factors: (1) the percentage of total city budget allocated to total IS expenditure, (2) the percentage of total IS budget allocated to IS outsourcing expenditures, and (3) the percentage of total IS budget allocated to each IS function. In Model 1, the findings show that the population size of city government is inversely related to the total percentage of city budget allocated to total IS expenditures: as the population size of city government increases, the percentage of the total budget of the city government allocated to IS expenditures decreases. In Model 2, three theories to explain decisions regarding IS outsourcing are used. Economic factors influencing IS outsourcing decisions are when: (1) pressure to reduce cost is important, (2) access to cutting-edge technology is important, (3) IS requires a long time for the in-house staff to learn, and, (4) IS facilities are not available. However, city administrators did not express a concern about the loss of control of strategic applications, about being locked into a contract, or even about added costs for business or technology changes when their IS is outsourced. Theories of innovation diffusion includes several factors. The findings show that city IS administrators do learn about IS outsourcing from neighboring governments. Organizational factors that can potentially influence the IS outsourcing decision include the type and population size of city government, available resources, and internal transaction costs. IS outsourcing expenditure as a percentage of total IS expenditure does not vary with the type and size of city government, a finding which requires further investigation. The analysis of different types and sizes of city governments appears in Model 3. When more resources are available to the IS department, the city government is likely to hire IS experts, provide facilities, and engage in a higher rate of insourcing. Internal transaction costs measured by time delays are inversely related to the expenditures on IS outsourcing. In Model 3, IS outsourcing expenditure by function as a percentage of total IS expenditure, three theoretical perspectives are employed to explain this analysis. In the category of economic factors influencing IS outsourcing, asset-non specific IS functions such as data processing/operations and network/telecommunications are outsourced in order to reduce cost while asset-specific IS functions, such as application development/maintenance, are outsourced in order to gain access to cutting-edge technology. With respect to whether theories of innovation diffusion explain the IS outsourcing decision, the findings show that city governments investigate other neighboring governments to determine whether there have been IS outsourcing decisions in the areas of data processing/operations, network/telecommunication, and application development/maintenance. According to the findings, first, small city governments tend to allocate a higher IS outsourcing expenditure as a percentage of total IS expenditure to than do large city governments. Second, large city governments tend to allocate a lower percentage of IS outsourcing expenditure to systems planning/management because large city governments tend to set up this IS function within the organization and, thus, spend money on maintaining this function. Third, the council-manager type of city governments tend to allocate a higher rate of IS outsourcing expenditure to network/telecommunication and application development/maintenance than do the mayor-council type of city governments.
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Date Issued: 1998
PURL: http://purl.flvc.org/fcla/dt/12582
Subject Headings: Information resources management, Contracting out
Format: Document (PDF)

FAU Theses and Dissertations (11)	+ -
Manuscripts (1)	+ -
Collection to hold Scholars (1)	+ -

Artificial intelligence (1)	+ -
Bridges, Truss (1)	+ -
Cargo handling--Equipment (1)	+ -
Contracting out (1)	+ -
Deep learning (Machine learning) (1)	+ -

Earthquake engineering (1)	+ -
Finite strip method (1)	+ -
Flow visualization (1)	+ -
Fluid dynamics (1)	+ -
Foundations (1)	+ -
Fuzzy logic (1)	+ -
Information resources management (1)	+ -
Loading and unloading (1)	+ -
Masts and rigging (1)	+ -
Neural networks (Computer science) (1)	+ -
Pavements--Skid resistance (1)	+ -
Photogrammetry (1)	+ -
Plates (Engineering)--Vibration (1)	+ -
Shells (Engineering)--Vibration (1)	+ -
Soil-structure interaction (1)	+ -
Steel, Structural--Fatigue (1)	+ -
Structural analysis (Engineering) (1)	+ -
Structural dynamics (1)	+ -
Three-dimensional modeling (1)	+ -
Turbulence--Mathematical models (1)	+ -
Turbulent boundary layer--Mathematical models (1)	+ -
Wave guides (1)	+ -
Yachts and yachting--Models (1)	+ -

Electronic Thesis or Dissertation (11)	+ -
document (1)	+ -

Florida Atlantic University (11)	+ -
College of Engineering and Computer Science (9)	+ -
Department of Ocean and Mechanical Engineering (8)	+ -
Yong, Yan (8)	+ -
Benson, George (1)	+ -

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