2009 IEEE/ASME International Conference on Advanced Intelligent Mechatronics, 2009
... and a 32 bit PC/104 small board computer (named Athena IITM) by DIAMOND were used. In the xPC... more ... and a 32 bit PC/104 small board computer (named Athena IITM) by DIAMOND were used. In the xPC TargetTM software, the desired programs were written in series of block diagrams format. The SIMULINKTM or xPC-TargetTM file was compiled and CS Chin, YJ Tan, KF Chee ...
We report on the formation of a stable quantum degenerate mixture of fermionic ^{6}Li and bosonic... more We report on the formation of a stable quantum degenerate mixture of fermionic ^{6}Li and bosonic ^{133}Cs in an optical trap by sympathetic cooling near an interspecies Feshbach resonance. New regimes of quantum degenerate Bose-Fermi mixtures are identified. With moderate attractive interspecies interactions, we show that a degenerate Fermi gas of Li can be fully confined in a Cs Bose-Einstein condensate without external potentials. For stronger attraction where mean-field collapse is expected, no such instability is observed. Potential mechanisms to explain this phenomenon are discussed.
This paper considers the dynamic modelling and simulation of an underactuated Remotely Operated V... more This paper considers the dynamic modelling and simulation of an underactuated Remotely Operated Vehicle (ROV) designed by Robotic Research Centre (RRC), in Nanyang Technological University (NTU) using a ROV Design and Analysis (RDA) toolbox written in MATLAB/SIMULINK™. The proposed RDA provides a means to simulate the mathematical models of ROV and the control system design before planning for final hardware implementation. This is especially useful, as the ROV model is highly uncertain due to the hydrodynamic forces that are nonlinear and coupled. However, there is no commercial software for ROV control system design and analysis.
An ultracold molecular quantum gas is created by application of a magnetic field sweep across a F... more An ultracold molecular quantum gas is created by application of a magnetic field sweep across a Feshbach resonance to a Bose-Einstein condensate of cesium atoms. The ability to separate the molecules from the atoms permits direct imaging ...
Urban transport traffic surveillance is of great importance for public traffic control and person... more Urban transport traffic surveillance is of great importance for public traffic control and personal travel path planning. Effective and efficient traffic flow prediction is helpful to optimize these real applications. The main challenge of traffic flow prediction is the data sparsity problem, meaning that traffic flow on some roads or of certain periods cannot be monitored. This paper presents a transport traffic prediction method that leverages the spatial and temporal correlation of transportation traffic to tackle this problem. We first propose to model the traffic flow using a fourth-order tensor, which incorporates the location, the time of day, the day of the week, and the week of the month. Based on the constructed traffic flow tensor, we either propose a model to estimate the correlation in each dimension of the tensor. Furthermore, we utilize the gradient descent strategy to design a traffic flow prediction algorithm that is capable of tackling the data sparsity problem fro...
One of the most amazing functions of the human auditory system is the ability to detect all kinds... more One of the most amazing functions of the human auditory system is the ability to detect all kinds of sound events in the environment. With the technologies and hardware advances, polyphonic Sound Event Detection (SED) can be developed to mimic the ability of the human auditory system. However, the development of a SED system is no trivial task, and several different factors often hinder accuracy. Although there are several overview papers available, most of them only provide a theoretical overview of algorithms used with little discussion. Thus, to the best of the authors' knowledge, there is no comprehensive review that covers this particular domain. Therefore, this paper aims to provide an in-depth discussion of different methodologies proposed by various authors that include the features used, detection algorithms, and their corresponding accuracy and limitations. Additional information on possible trends is also discussed that can be useful for future development works. INDEX TERMS Deep learning, detection algorithms, Gaussian mixture model, non-negative matrix factorization, polyphonic sound event detection.
178th Meeting of the Acoustical Society of America
This study uses traffic noise mapping and structural equation model to evaluate the impact of noi... more This study uses traffic noise mapping and structural equation model to evaluate the impact of noise annoyance from highway traffic noise. The indices generated in noise maps by CityMap have verified the actual field measurements obtained from the site. Structural Equation Model addresses the relationship between noise annoyance and psychological factors. The results show that the noise annoyance is mainly shaped by the subject's concern and noise disturbance including the negativity on perceived disturbance and noise sensitivity. The noise levels are affected by the type of vehicles in the road, mainly on the heavy truck with more axles instead of the count of vehicles only. The traffic noise level can exceed the permissible limit established by a local government agency at a particular time of the day and on an overhead bridge situated near the vicinity of the residential area.
Lithium-ion battery (LIB) power systems have been commonly used for energy storage in electric ve... more Lithium-ion battery (LIB) power systems have been commonly used for energy storage in electric vehicles. However, it is quite challenging to implement a robust real-time fault diagnosis and protection scheme to ensure battery safety and performance. This paper presents a resilient framework for real-time fault diagnosis and protection in a battery-power system. Based on the proposed system structure, the self-initialization scheme for state-of-charge (SOC) estimation and the fault-diagnosis scheme were tested and implemented in an actual 12-cell series battery-pack prototype. The experimental results validated that the proposed system can estimate the SOC, diagnose the fault and provide necessary protection and self-recovery actions under the load profile for an electric vehicle.
A computational efficient battery pack model with thermal consideration is essential for simulati... more A computational efficient battery pack model with thermal consideration is essential for simulation prototyping before real-time embedded implementation. The proposed model provides a coupled equivalent circuit and convective thermal model to determine the state-of-charge (SOC) and temperature of the LiFePO 4 battery working in a real environment. A cell balancing strategy applied to the proposed temperature-dependent battery model balanced the SOC of each cell to increase the lifespan of the battery. The simulation outputs are validated by a set of independent experimental data at a different temperature to ensure the model validity and reliability. The results show a root mean square (RMS) error of 1.5609 × 10 −5 for the terminal voltage and the comparison between the simulation and experiment at various temperatures (from 5 • C to 45 • C) shows a maximum RMS error of 7.2078 × 10 −5 .
2015 IEEE 7th International Conference on Cybernetics and Intelligent Systems (CIS) and IEEE Conference on Robotics, Automation and Mechatronics (RAM), 2015
The paper proposes a cascaded multi-controllers switching scheme for stabilization and pipeline t... more The paper proposes a cascaded multi-controllers switching scheme for stabilization and pipeline tracking of a remotely operated vehicle (ROV) under hydrodynamic uncertainties. The ROV is inherently non-linear, highly coupled in motions and vulnerable to the hydrodynamic uncertainties. With controllers that cancel the nonlinear dynamic, the system is robust against the pre-defined values on the hydrodynamic added mass and the damping terms. The values used in these perturbed terms (or parametric uncertainties) were obtained numerically using the WAMIT software. Compared with other controllers such as Proportional-Integral and backstepping method, the pool test showed that the proposed method gives better time domain response and robustness against the perturbed terms.
Simulation Transactions of the Society For Modeling and Simulation International, 2012
ABSTRACT The dynamic positioning simulation of an actual drill ship under a normal and faulty con... more ABSTRACT The dynamic positioning simulation of an actual drill ship under a normal and faulty condition is proposed using MATLAB™ and Simulink™ software. The proposed simulation model provides a means to control a non-linear and coupled OD21 drill ship under different external perturbations, such as wind, wave, current and thruster failure during the design stage. A proportional–integral–derivative (PID) controller for the dynamic positioning ship system was designed and validated with experimental results from a sea trial. Through simulation, the proposed PID control and thrust allocation method are able to maintain the desired heading angle under various test conditions, such as drilling, standby and thruster failure.
2009 IEEE/ASME International Conference on Advanced Intelligent Mechatronics, 2009
... and a 32 bit PC/104 small board computer (named Athena IITM) by DIAMOND were used. In the xPC... more ... and a 32 bit PC/104 small board computer (named Athena IITM) by DIAMOND were used. In the xPC TargetTM software, the desired programs were written in series of block diagrams format. The SIMULINKTM or xPC-TargetTM file was compiled and CS Chin, YJ Tan, KF Chee ...
We report on the formation of a stable quantum degenerate mixture of fermionic ^{6}Li and bosonic... more We report on the formation of a stable quantum degenerate mixture of fermionic ^{6}Li and bosonic ^{133}Cs in an optical trap by sympathetic cooling near an interspecies Feshbach resonance. New regimes of quantum degenerate Bose-Fermi mixtures are identified. With moderate attractive interspecies interactions, we show that a degenerate Fermi gas of Li can be fully confined in a Cs Bose-Einstein condensate without external potentials. For stronger attraction where mean-field collapse is expected, no such instability is observed. Potential mechanisms to explain this phenomenon are discussed.
This paper considers the dynamic modelling and simulation of an underactuated Remotely Operated V... more This paper considers the dynamic modelling and simulation of an underactuated Remotely Operated Vehicle (ROV) designed by Robotic Research Centre (RRC), in Nanyang Technological University (NTU) using a ROV Design and Analysis (RDA) toolbox written in MATLAB/SIMULINK™. The proposed RDA provides a means to simulate the mathematical models of ROV and the control system design before planning for final hardware implementation. This is especially useful, as the ROV model is highly uncertain due to the hydrodynamic forces that are nonlinear and coupled. However, there is no commercial software for ROV control system design and analysis.
An ultracold molecular quantum gas is created by application of a magnetic field sweep across a F... more An ultracold molecular quantum gas is created by application of a magnetic field sweep across a Feshbach resonance to a Bose-Einstein condensate of cesium atoms. The ability to separate the molecules from the atoms permits direct imaging ...
Urban transport traffic surveillance is of great importance for public traffic control and person... more Urban transport traffic surveillance is of great importance for public traffic control and personal travel path planning. Effective and efficient traffic flow prediction is helpful to optimize these real applications. The main challenge of traffic flow prediction is the data sparsity problem, meaning that traffic flow on some roads or of certain periods cannot be monitored. This paper presents a transport traffic prediction method that leverages the spatial and temporal correlation of transportation traffic to tackle this problem. We first propose to model the traffic flow using a fourth-order tensor, which incorporates the location, the time of day, the day of the week, and the week of the month. Based on the constructed traffic flow tensor, we either propose a model to estimate the correlation in each dimension of the tensor. Furthermore, we utilize the gradient descent strategy to design a traffic flow prediction algorithm that is capable of tackling the data sparsity problem fro...
One of the most amazing functions of the human auditory system is the ability to detect all kinds... more One of the most amazing functions of the human auditory system is the ability to detect all kinds of sound events in the environment. With the technologies and hardware advances, polyphonic Sound Event Detection (SED) can be developed to mimic the ability of the human auditory system. However, the development of a SED system is no trivial task, and several different factors often hinder accuracy. Although there are several overview papers available, most of them only provide a theoretical overview of algorithms used with little discussion. Thus, to the best of the authors' knowledge, there is no comprehensive review that covers this particular domain. Therefore, this paper aims to provide an in-depth discussion of different methodologies proposed by various authors that include the features used, detection algorithms, and their corresponding accuracy and limitations. Additional information on possible trends is also discussed that can be useful for future development works. INDEX TERMS Deep learning, detection algorithms, Gaussian mixture model, non-negative matrix factorization, polyphonic sound event detection.
178th Meeting of the Acoustical Society of America
This study uses traffic noise mapping and structural equation model to evaluate the impact of noi... more This study uses traffic noise mapping and structural equation model to evaluate the impact of noise annoyance from highway traffic noise. The indices generated in noise maps by CityMap have verified the actual field measurements obtained from the site. Structural Equation Model addresses the relationship between noise annoyance and psychological factors. The results show that the noise annoyance is mainly shaped by the subject's concern and noise disturbance including the negativity on perceived disturbance and noise sensitivity. The noise levels are affected by the type of vehicles in the road, mainly on the heavy truck with more axles instead of the count of vehicles only. The traffic noise level can exceed the permissible limit established by a local government agency at a particular time of the day and on an overhead bridge situated near the vicinity of the residential area.
Lithium-ion battery (LIB) power systems have been commonly used for energy storage in electric ve... more Lithium-ion battery (LIB) power systems have been commonly used for energy storage in electric vehicles. However, it is quite challenging to implement a robust real-time fault diagnosis and protection scheme to ensure battery safety and performance. This paper presents a resilient framework for real-time fault diagnosis and protection in a battery-power system. Based on the proposed system structure, the self-initialization scheme for state-of-charge (SOC) estimation and the fault-diagnosis scheme were tested and implemented in an actual 12-cell series battery-pack prototype. The experimental results validated that the proposed system can estimate the SOC, diagnose the fault and provide necessary protection and self-recovery actions under the load profile for an electric vehicle.
A computational efficient battery pack model with thermal consideration is essential for simulati... more A computational efficient battery pack model with thermal consideration is essential for simulation prototyping before real-time embedded implementation. The proposed model provides a coupled equivalent circuit and convective thermal model to determine the state-of-charge (SOC) and temperature of the LiFePO 4 battery working in a real environment. A cell balancing strategy applied to the proposed temperature-dependent battery model balanced the SOC of each cell to increase the lifespan of the battery. The simulation outputs are validated by a set of independent experimental data at a different temperature to ensure the model validity and reliability. The results show a root mean square (RMS) error of 1.5609 × 10 −5 for the terminal voltage and the comparison between the simulation and experiment at various temperatures (from 5 • C to 45 • C) shows a maximum RMS error of 7.2078 × 10 −5 .
2015 IEEE 7th International Conference on Cybernetics and Intelligent Systems (CIS) and IEEE Conference on Robotics, Automation and Mechatronics (RAM), 2015
The paper proposes a cascaded multi-controllers switching scheme for stabilization and pipeline t... more The paper proposes a cascaded multi-controllers switching scheme for stabilization and pipeline tracking of a remotely operated vehicle (ROV) under hydrodynamic uncertainties. The ROV is inherently non-linear, highly coupled in motions and vulnerable to the hydrodynamic uncertainties. With controllers that cancel the nonlinear dynamic, the system is robust against the pre-defined values on the hydrodynamic added mass and the damping terms. The values used in these perturbed terms (or parametric uncertainties) were obtained numerically using the WAMIT software. Compared with other controllers such as Proportional-Integral and backstepping method, the pool test showed that the proposed method gives better time domain response and robustness against the perturbed terms.
Simulation Transactions of the Society For Modeling and Simulation International, 2012
ABSTRACT The dynamic positioning simulation of an actual drill ship under a normal and faulty con... more ABSTRACT The dynamic positioning simulation of an actual drill ship under a normal and faulty condition is proposed using MATLAB™ and Simulink™ software. The proposed simulation model provides a means to control a non-linear and coupled OD21 drill ship under different external perturbations, such as wind, wave, current and thruster failure during the design stage. A proportional–integral–derivative (PID) controller for the dynamic positioning ship system was designed and validated with experimental results from a sea trial. Through simulation, the proposed PID control and thrust allocation method are able to maintain the desired heading angle under various test conditions, such as drilling, standby and thruster failure.
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