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Articles 4711 - 4740 of 13783
Full-Text Articles in Operations Research, Systems Engineering and Industrial Engineering
Human Error In Commercial Fishing Vessel Accidents: An Investigation Using The Human Factors Analysis And Classification System, Peter J. Zohorsky
Human Error In Commercial Fishing Vessel Accidents: An Investigation Using The Human Factors Analysis And Classification System, Peter J. Zohorsky
Engineering Management & Systems Engineering Theses & Dissertations
The commercial fishing industry is frequently described as one of the most hazardous occupations in the United States. The objective, to maximize the catch, is routinely challenged by a variety of elements due to the environment, the vessel, the crew, and several external considerations and how they interact with each other. The analysis of fishing vessel accidents can be complicated due to the diverse nature of the industry, including the species caught, the type and size of boat that is employed, how far travelled from their homeport, and the adequacy of the support organizations ensuring safe and uninterrupted operations. This …
Application Of Classification In Machine Learning: An Analysis Of Highway-Rail Grade Crossing Systems Safety, Christopher John Helmer Cox
Application Of Classification In Machine Learning: An Analysis Of Highway-Rail Grade Crossing Systems Safety, Christopher John Helmer Cox
Theses and Dissertations
Highway-rail grade crossing accidents are the second leading cause of fatalities within the railway transportation industry. Highway-rail grade crossing fatality statistics have failed to improve over the last decade, and in some years have increased. Because of these trends, research has found that considerable Federal funding initiatives exist to support and develop contemporary risk reduction methodologies involving machine learning and artificial intelligence. In accord with these initiatives, this thesis investigates the highway-rail grade crossing safety problem using machine learning to implement an ensemble decision tree-based classification application. The resulting classifier has been validated to achieve a less than three percent …
A Comparative Assessment Of Co2 Emission Between Gasoline, Electric, And Hybrid Vehicles: A Well-To-Wheel Perspective Using Agent-Based Modeling, Mdmamunur Rahman
A Comparative Assessment Of Co2 Emission Between Gasoline, Electric, And Hybrid Vehicles: A Well-To-Wheel Perspective Using Agent-Based Modeling, Mdmamunur Rahman
Industrial, Manufacturing, and Systems Engineering Dissertations - Archive
Road transports in the U.S. are almost entirely dependent on the consumption of fossil fuel. This high dependency on fossil fuel is significantly contributing to carbon dioxide (CO2) emission, one of the leading Green House Gases (GHGs) responsible for global warming. Electrification of passenger vehicles could be an effective strategy to curb GHG emissions. Though Electric Vehicles (EVs) have zero tailpipe emissions, the power required to charge EV batteries may not necessarily come from carbon-free power plants. In this study, for a comprehensive comparison between EV and Gasoline Vehicle (GV), we developed an agent-based simulation model for the entire energy …
A Framework For Using Fused Image Data In Statistical Process Control, Shengfeng Chen
A Framework For Using Fused Image Data In Statistical Process Control, Shengfeng Chen
Dissertations
The use of image data in manufacturing quality control systems has grown rapidly over the years. Technological advancements in imaging devices (e.g., digital cameras, x-ray scanners, infrared cameras) have provided convenient and cost-effective ways to obtain images. These images contain important quality features (e.g., textures and product dimensions) that can be used to monitor, diagnose, predict, and control manufacturing processes. A key tool for monitoring images is statistical process control charts. Integrating images of parts to detect process shifts can significantly improve a quality systems efficiency. Unfortunately, appropriate techniques that take full advantage of data-rich images for control charting are …
Mental Workload Investigation Among Employees In A Selected Oil And Gas Company, C. Moosom Christyne Surindai
Mental Workload Investigation Among Employees In A Selected Oil And Gas Company, C. Moosom Christyne Surindai
Student Works (2020-2029)
In recent years, there has been a substantial amount of studies being conducted in mental workload and mental health but there is little research conducted in the Malaysian context especially in the oil and gas field. This gives rise to the need for researching the level of mental workload and mental health problems that will help the stakeholders to protect the wellbeing of their employees. This study aims to investigate the mental workload and level of depression, anxiety and stress scale of employees in a selected oil and gas company by using CarMen-Q and DASS-21 mental health assessment tools, finds …
Emergency Department Systems Engineering: Modelling And Event Simulation, O Alharethi Salman Zayed
Emergency Department Systems Engineering: Modelling And Event Simulation, O Alharethi Salman Zayed
Student Works (2020-2029)
Emergency department systems are meant to ensure the timely delivery for essential healthcare services through complex systems. (ED) offers various services and have several components in its parts. Examined long previous research on system engineering and quality of healthcare resulting on these are influenced by operational management. Real time data are very helpful for decision making for any systems. Patient output feedback and satisfaction can be ensured with engineered management. EDs have become evident particularly in current scenario when the world is in the grip of the deadly COVID-19. All this implies that analysis is significant for improvement of services …
A Core Reference Hierarchical Primitive Ontology For Electronic Medical Records Semantics Interoperability, Ziniya Zahedi
A Core Reference Hierarchical Primitive Ontology For Electronic Medical Records Semantics Interoperability, Ziniya Zahedi
Engineering Management & Systems Engineering Theses & Dissertations
Currently, electronic medical records (EMR) cannot be exchanged among hospitals, clinics, laboratories, pharmacies, and insurance providers or made available to patients outside of local networks. Hospital, laboratory, pharmacy, and insurance provider legacy databases can share medical data within a respective network and limited data with patients. The lack of interoperability has its roots in the historical development of electronic medical records. Two issues contribute to interoperability failure. The first is that legacy medical record databases and expert systems were designed with semantics that support only internal information exchange. The second is ontological commitment to the semantics of a particular knowledge …
A Framework For Adaptive Capacity In Complex Systems, Abdulrahman Alfaqiri
A Framework For Adaptive Capacity In Complex Systems, Abdulrahman Alfaqiri
Engineering Management & Systems Engineering Theses & Dissertations
Complex systems are characterized by their high level of inter-connectivity, ambiguity, and emergence. Therefore, a failure in one element of a system (e.g. cyber layer) due to external or internal disturbances can lead to a cascade effect that may influence all elements of the system. Consequently, the complex system will not be able to perform its functional performance. Threats related to complex systems are very dynamic, fast, complex and damage can be severe. Thus, to respond to the dynamic and unpredictable nature of these threats, complex systems need to be highly adaptive to survive and thrive in the face of …
A Quest To Identify The Emerging Leadership Skills In Vuca World And Investigation Of Their Applications In Various Organizational Levels And Security Environments, Ali Can Kucukozyigit
A Quest To Identify The Emerging Leadership Skills In Vuca World And Investigation Of Their Applications In Various Organizational Levels And Security Environments, Ali Can Kucukozyigit
Engineering Management & Systems Engineering Theses & Dissertations
The theoretical framework of this research is based on “skills approach” that emphasizes the leader’s capabilities (skills, knowledge, and capabilities) that can be learned, taught, and fostered. VUCA (Volatile, Uncertain, Complex and Ambiguous) environment is chosen as the focal point of this research as the leadership skills are extracted from studies referring to such environment. Although the acronym is dominantly used in management and business domains, the military also uses it to describe the complex operational environments like in Iraq and Afghanistan. The identification of individual leadership skills and delivering the right skill, at the right time, to the right …
Cyber-Assets At Risk (Car): Monetary Impact Of Personally Identifiable Information Data Breaches On Companies, Omer Ilker Poyraz
Cyber-Assets At Risk (Car): Monetary Impact Of Personally Identifiable Information Data Breaches On Companies, Omer Ilker Poyraz
Engineering Management & Systems Engineering Theses & Dissertations
Cyber-systems provide convenience, ubiquity, economic advantage, and higher efficiency to both individuals and organizations. However, vulnerabilities of the cyber domain also offer malicious actors with the opportunities to compromise the most sensitive information. Recent cybersecurity incidents show that a group of hackers can cause a massive data breach, resulting in companies losing competitive advantage, reputation, and money. Governments have since taken some actions in protecting individuals and companies from such crime by authorizing federal agencies and developing regulations. To protect the public from losing their most sensitive records, governments have also been compelling companies to follow cybersecurity regulations. If companies …
Numerical Simulation About Fuel Injection Source Location Impacting On Turbulent Combustion Process, Sun Hui, Guangcheng Cai, Jiang Lin, Shibo Wang
Numerical Simulation About Fuel Injection Source Location Impacting On Turbulent Combustion Process, Sun Hui, Guangcheng Cai, Jiang Lin, Shibo Wang
Journal of System Simulation
Abstract: Fuel injection source location has very important influence on combustion process. It determines the location of the furnace flame. The three dimensional model of the furnace was established by the numerical simulation method. Under different conditions, the fuel injection source location on the temperature field within the furnace, the pollutant concentration field, and the flow field distribution inside the furnace combustion process were investigated. The results were compared and analyzed. After analysis, the results show that the fuel injection source location from 1.1 ~ 1.5 meter process of change, the average temperature within the furnace continue to rise, the …
Research On Methods For Transformation Of Declarative Model For Semi-Physical Simulation, Weijian Huang, Jianwan Ding, Liping Chen, Zhaoyuan Zhou
Research On Methods For Transformation Of Declarative Model For Semi-Physical Simulation, Weijian Huang, Jianwan Ding, Liping Chen, Zhaoyuan Zhou
Journal of System Simulation
Abstract: A new method for the transformation from the declarative model to the model for semi-physical simulation was proposed aiming at semi-physical simulation. By analyzing the mathematical form of the declarative model and the model for semi-physical simulation, based on bipartite graph, the mathematical form of declarative model to the mathematical form of the model for semi-physical simulation was transformed through decomposition based on bipartite graph and tearing the algebraic loop, using clutch model as the model transformation examples. The declarative model transforming idea has overcome the disadvantages of process modeling method such as considering the causality, difficult …
Improved Crack Removing Algorithm For Quad-Tree Terrain Rendering, Wan Ming, Liang Xia, Fengming Zhang
Improved Crack Removing Algorithm For Quad-Tree Terrain Rendering, Wan Ming, Liang Xia, Fengming Zhang
Journal of System Simulation
Abstract: In 3D large scale multi-resolution terrain rendering, an improved algorithm based on LOD control and visibility for crack removing was proposed. It is proved that quad-tree grid is restricted while the ratio of visible distance to grid extent is large than 3. In preprocess stage, cracks were classified to raise crack and dropped crack, and crack patches with the same size as cracks were generated and attached to the latter. In real-time rendering stage, no special calculation by CPU for restriction of level of detail or for crack removing between adjacent grids was needed. Example shows that …
Situation Assessment Method For Cooperative Air Combat Based On Dynamic Combat Power Field, Zhanwu Li, Yizhe Chang, Haiyan Yang, Yingxin Kou, Xu An
Situation Assessment Method For Cooperative Air Combat Based On Dynamic Combat Power Field, Zhanwu Li, Yizhe Chang, Haiyan Yang, Yingxin Kou, Xu An
Journal of System Simulation
Abstract: Considering on the remaining problem in current situation assessment of Beyond-Visual-Range cooperative air combat, such as isolation of static/dynamic state superiority, the concept of combat power field was applied in situation assessment of Beyond-Visual-Range cooperative air combat. Coupled with characteristics of cooperative air combat, the model of combat power field was constructed by aspects of attack, communication, detection, maneuverability, electronic countermeasure and cooperation and alert. The method was verified by the simulation. The result shows the method has advantages of integrity, visualization and continuity compared with former situation assessment methods, and is also able to improve the quality and …
Design And Motion Control Of Four-Wheel Automotive Chassis Inspection Robot, Jue Zhu, Yongbin Huang, Zhang He
Design And Motion Control Of Four-Wheel Automotive Chassis Inspection Robot, Jue Zhu, Yongbin Huang, Zhang He
Journal of System Simulation
Abstract: The system structure of an automobile chassis inspection robot was introduced. Furthermore the equation of motion state of robot was established and a decoupling controller was designed. The robot with omnidirectional wheel moving mechanism achieved the chassis image acquisition with wireless camera system and employed the active disturbance rejection controller for motion control. The robot has the characters of wide applicability, flexibility of platform movement, the stability of motion state, which can effectively compensate for the lack of traditional inspection methods, and a reasonable design in automobile chassis inspection is proved. The motion equation of state established for omnidirectional …
Risk Analysis Of Passenger Car Moving On Curved Sections Based On Sideslip Microscopic Simulation, Zhang Chi, Dongjian Shao, Zhang Min
Risk Analysis Of Passenger Car Moving On Curved Sections Based On Sideslip Microscopic Simulation, Zhang Chi, Dongjian Shao, Zhang Min
Journal of System Simulation
Abstract: In consideration of rainfall and over-speeding, the risk of passenger car moving on curved sections was analyzed synthetically. The simulation model of the dynamic characteristic of passenger car was established using Carsim, the critical adhesion coefficient was used as the evaluation index of passenger car moving risk, and the evaluation model of passenger car moving on curved sections was established using Matlab. The results show that under the situation of design speed 80km/h, when driving speed exceeds 96km/h, the risk probability of passenger car moving on rainfall curved sections exceeds 48.40%; when the rainfall intensity is bigger than …
Numerical Simulation Of Hot And Cold Fluids Mixing In A Tee-Junction, Wenli Wei, Yunfei Hong, Shipeng Shao, Yuling Liu
Numerical Simulation Of Hot And Cold Fluids Mixing In A Tee-Junction, Wenli Wei, Yunfei Hong, Shipeng Shao, Yuling Liu
Journal of System Simulation
Abstract: Flow and heat transfer model in tee junction was established and the 3D RNG k-ε turbulence model was completed to simulate the process of mixing and capture the information of velocity and temperature. The simulation results and measured data of the mean value of velocity and temperature were analyzed and compared, and are in a good agreement, which indicates that the RNG k-ε model combined with the heat transfer model can well simulate the hydraulic characteristics and heat transfer mechanism of hot and cold fluids in a tee junction. Furthermore, the upstream segment of a tee junction has two …
Research On Fault Diagnosis For Pitch Sensors Of Wind Turbines, Yanjie Zhai, Dinghui Wu, Yiyang Li, Zhicheng Ji
Research On Fault Diagnosis For Pitch Sensors Of Wind Turbines, Yanjie Zhai, Dinghui Wu, Yiyang Li, Zhicheng Ji
Journal of System Simulation
Abstract: Considering the biased output fault of pitch sensors for wind turbines, a fault diagnosis method based on the multi-innovation kalman filter algorithm was proposed. The corresponding relationship between the change of the pitch angle and the tiny displacement produced by the force acting on the tower was established according to the mechanical structure characteristics of wind turbines. More accurate estimated value for the tiny displacement was achieved by using the multi-innovation kalman filter algorithm which had higher convergence speed and estimation accuracy to reduce the large noise of the output information generated by sensors. The fault could be detected …
Research On Optimizing Lot Sizing Of Job Shop Based On Em_Plant, Xiaobing Pei, Linlin Tan
Research On Optimizing Lot Sizing Of Job Shop Based On Em_Plant, Xiaobing Pei, Linlin Tan
Journal of System Simulation
Abstract: Considering maximizing the rate of account and choosing production process time as the optimization objectives to solve the lot sizing optimization problems of job shop, the model about production time under ideal conditions was established, and accordingly the formula of solving theoretical optimal lot sizing was derived. To compensate for the limitations of mathematical modeling and improve the feasibility of the optimal solution, the actual manufacturing operations in job shop was simulated and optimized according to production batch simulation optimization strategy by eM_plant software. By running the simulation model the theoretical optimal solution was amended, to make optimal …
Design And Implementation Of Quantum-Inspired Bee Colony Algorithm, Shuyun Yang, Panchi Li
Design And Implementation Of Quantum-Inspired Bee Colony Algorithm, Shuyun Yang, Panchi Li
Journal of System Simulation
Abstract: To enhance the performance of artificial bee colony algorithm, a quantum-inspired bee colony algorithm was proposed. In the proposed approach, the bees were encoded with the qubits described on the Bloch sphere. The evolutionary search was achieved by rotating the qubit about the rotation axis on the Bloch sphere. The Bloch coordinates of qubit can be obtained by measuring with the Pauli matrices, and the optimization solutions can be presented through the solution space transformation. The highlight advantages of this method are the ability to simultaneously adjust two parameters of a qubit and automatically achieve the best match between …
Intelligent Detecting For Infrared Aerial Small Target Based On Non-Subsampled Contourlet Transform, Liu Gang, Xingyuan Xu, Zhou Heng, Xitao Zhang
Intelligent Detecting For Infrared Aerial Small Target Based On Non-Subsampled Contourlet Transform, Liu Gang, Xingyuan Xu, Zhou Heng, Xitao Zhang
Journal of System Simulation
Abstract: Aiming at the problem of infrared aerospace small target's detecting under complex background, an intelligent algorithm was proposed based on the non-subsampled contourlet transform and BP neutral network. By using the morphologic top-hat transform which had adaptive structural element, some infrared background was suppressed. By defining the center vector of subband coefficients, the proposed method constructed the synthetical image at high frequency and suppressed the complex background further. Subsequently, taking pixel's gray level, horizontal gradient, vertical gradient, diagonal gradient, neighbour mean and neighbour variance as input character vector, a BP neutral network which had three layers was constructed by …
Dynamic Simulation And Test Of Mountain Orchard Double-Track Transport Traction System, Yuping Ouyang, Tiansheng Hong, Yudong Ma
Dynamic Simulation And Test Of Mountain Orchard Double-Track Transport Traction System, Yuping Ouyang, Tiansheng Hong, Yudong Ma
Journal of System Simulation
Abstract: After the traction system virtual prototype model of mountain orchard transport was established, virtual simulation test was done to get the force of wire rope and the dynamic characteristics. Compared with trapezoidal velocity, under S type velocity curve, vehicle vibration amplitude was decreased obviously in each stage, average maximum force and average force of four key points was respectively decreased by 9.2% and 12.7%. Average relative error between kinetic parameters calculation and simulation values was 4.8%. Average relative error between test and simulation values was 4.02 %. This research results have provided a simulation platform and reference to whole …
Image Saliency Analysis Based On Grey Relational Computation And Prior Combination, Qiangqiang Zhou, Zhicheng Wang, Weidong Zhao, Yufei Chen, Wang Gang
Image Saliency Analysis Based On Grey Relational Computation And Prior Combination, Qiangqiang Zhou, Zhicheng Wang, Weidong Zhao, Yufei Chen, Wang Gang
Journal of System Simulation
Abstract: An image saliency analysis method based on the combination of grey relational computation and prior knowledge, which is a saliency computation and integration based on three different priori of boundary background, global color distribution and top salient information. The SLIC method segment the image into superpixels, then selecting the boundary superpixels on four image sides respectively to construct the reference sequence, and the same method used to construct the comparative sequence of the rest superpixels. Then four initial saliency images was derived based on boundary background priori through a grey relational computation, to make weighted and …
Performance Analysis Of Netted Radar Data Fusion Systems, Zhijie Chen, Bin Rao, Yongzhen Li, Zhiwei Zong
Performance Analysis Of Netted Radar Data Fusion Systems, Zhijie Chen, Bin Rao, Yongzhen Li, Zhiwei Zong
Journal of System Simulation
Abstract: The performance analysis of netted radar data fusion systems was proposed. The principles of two representative radar netting modes (i.e., centralized fusion and distributed fusion) were introduced and the associated capabilities of anti-jamming, anti-stealth, fusion accuracy, fusion discrimination, and communication requirements were quantitatively analyzed. Simulation results indicate that the netting essence is, centralized fusion by using ‘or' rule to complement information and realize trajectory composition whereas distributed fusion by using ‘and' rule to reduce information redundancy and realize discrimination ability. The research can provide some enlightenment for the newly-developed intellective netted radar data fusion systems.
Parameter Optimization On Coordinated Control System Of Thermal Power Units In High Rate Variable Load Operation Mode, Tian Liang, Liu Fang, Xinping Liu, Jizhen Liu
Parameter Optimization On Coordinated Control System Of Thermal Power Units In High Rate Variable Load Operation Mode, Tian Liang, Liu Fang, Xinping Liu, Jizhen Liu
Journal of System Simulation
Abstract: The frequent fluctuations and rapid change of power grid generating load instruction cause the deterioration of control quality of generating load and throttle pressure in thermal power units. To solve this problem, a trial and error method, the parameters adjustment range of which could be quantified, was proposed. Based on the model of controlled object, the initial value of controller parameters were set conservatively. By calculating the difference between current value and the target value of load change rate, the optimization times were determined, the PID controller parameters optimization method of coordinated control system was studied, and the effectiveness …
Chaos Analysis For Tcp Congestion Control In Heterogeneous Networks, Xuhui Wei, Wang Hui
Chaos Analysis For Tcp Congestion Control In Heterogeneous Networks, Xuhui Wei, Wang Hui
Journal of System Simulation
Abstract: In order to study the chaos nature of TCP in Heterogeneous Network, the major features were demonstrated such as periodicity, sensitivity to initial conditions (butterfly effect), and strange attractor of chaotic system by analyzing parameters in Heterogeneous Network proving that TCP shows chaos nature in Heterogeneous Network in certain situations. Numerical examples show that in the case of system with low bottleneck link, the system shows fine periodic and stable behavior, and there is no TCP deadlock phenomenon in the heterogeneous network system. In the case of system with larger bottleneck link, the system shows chaotic. And a …
Adaptive Multichannel Double L-Shaped Microphone Array Sound Source Localization Algorithm, Yecai Guo, Sainan Zhu, Zhang Ning
Adaptive Multichannel Double L-Shaped Microphone Array Sound Source Localization Algorithm, Yecai Guo, Sainan Zhu, Zhang Ning
Journal of System Simulation
Abstract: Aiming at the lack of ability to resist noise and reverberation and the location estimation low accuracy for the sound source localization method based on microphone array in the indoor sound environments, a sound source localization algorithm based on adaptive multichannel double L-shaped microphone array was proposed. In this proposed algorithm, normalized multichannel frequency-domain least mean square algorithm was used to estimate the impulse responses of different array elements and acquire the time delay under condition of the single source and multiple reverberation model, the spectrum energy was modified by penalty function to improve the ability to suppress noise …
Research On Section Optimization Of Water Quality Monitoring Based On Comprehensive Hierarchical Clustering, Xiaofeng Lian, Peng Sen, Xiaoyi Wang, Zaiwen Liu
Research On Section Optimization Of Water Quality Monitoring Based On Comprehensive Hierarchical Clustering, Xiaofeng Lian, Peng Sen, Xiaoyi Wang, Zaiwen Liu
Journal of System Simulation
Abstract: In order to optimize the layout of water quality monitoring section of river, lake and reservoir effectively, a new method for water quality monitoring section optimization was proposed based on comprehensive hierarchical clustering (CHC). A normalized matrix was constructed according to the original monitoring data of water quality. The method calculated the similarity to obtain the affinity-disaffinity relationship among the monitoring variables by 5 different distance algorithms, and then clustered the data set automatically by 4 different connection algorithms. Moreover, taking the correlation coefficient as the evaluation criteria, optimal hierarchical clustering algorithm was selected. With the generation …
Cqpso Algorithm Based Control System Parameter Optimization, Genyuan Wei, Xinqiang Feng, Han Pu
Cqpso Algorithm Based Control System Parameter Optimization, Genyuan Wei, Xinqiang Feng, Han Pu
Journal of System Simulation
Abstract: According to the shortcomings of optimization methods of control system parameters, and the result of PSO algorithm usually falling into the partial optimum, Chaos Search and Quantum Space Search were added to the PSO algorithm, constituting the Chaos Quantum Particle Swarm Optimization algorithm, which was applied to the typical thermal control system parameters optimization. Introducing the selection of object functions of control system parameter optimization, describing the CQPSO algorithm process, the CQPSO algorithm was tested and analyzed through multiple test functions. The result shows that, compared with PSO and CPSO algorithm, CQPSO algorithm makes the particle swarm get out …
Sliding Parameters Calculation Of Agricultural Tracked Robot Based On Ukf And Smo, Jiao Jun, Kong Wen, Lichuan Gu, Wang Qiang, Ya Gao, Chenchen Yuan
Sliding Parameters Calculation Of Agricultural Tracked Robot Based On Ukf And Smo, Jiao Jun, Kong Wen, Lichuan Gu, Wang Qiang, Ya Gao, Chenchen Yuan
Journal of System Simulation
Abstract: In order to make ensure an Agricultural Tracked Robot (ATR) stable driving in farmland and reduce the slip phenomenon parameters, a novel sliding parameters estimation scheme of ATR based on UKF (Unscented Kalman Filter) and SMO (Sliding Mode Observer) was proposed. The motion equation and measurement equation of ATR were fused by UKF to compensate the measurement error from sensors and to reconstruct the precision pose parameters of ATR. Three slip parameter observers were designed for the sideslip angle, left and right track slip rate, which used the tangent function was used as the switching function to cover chattering …