Chung Hyun Goh - Academia.edu (original) (raw)
Papers by Chung Hyun Goh
Journal of Software Engineering and Applications
Crouch gait is a motor complication commonly associated with cerebral palsy, spastic diplegia, st... more Crouch gait is a motor complication commonly associated with cerebral palsy, spastic diplegia, stroke, and motor-neurological pathologies, broadly defined as knee flexion in excess of 20° in the gait cycle. Uncorrected crouch gait results in fatigue, joint degradation, and loss of ambulation. Torsion springs have been used in cycling to store energy in knee flexion to reduce fatigue in the quadriceps during knee extension. SolidWorks was used to design a passive exoskeleton for the knee, incorporating torsion springs of stiffnesses 20,000 N/mm and 30,000 N/mm at the knee joint to correct four different crouch gaits. OpenSim was used to gather data from moments produced and knee angles from each crouch gait and the normal gait. Motion analysis of the exoskeleton was simulated using knee angles for each crouch gait and compared with moments produced with the normal gait moments in the stance phase of the gait cycle. All crouch gait moments were significantly reduced, and the correctio...
This project asked engineering students to develop a multi-subsystem design that would produce el... more This project asked engineering students to develop a multi-subsystem design that would produce electricity. Students over the duration of this project learned how to simulate and design systems theoretically using computer tools. Furthermore, students were expected to produce a prototype of their model, thereby self-analyzing the practicality levels and enhancing learning. With the technology available to students advancing, systems integration techniques become more efficient learning experiences to the students. The benefits of systems integration can also be expanded to the professional world these students will soon step into. Therefore, teaching these techniques now will give students a better further insight on real world experience in a classroom setting. When students make the expected leap into the job market, it is important for them to have a solid understanding of system integration and multi-system design. It is this understanding that will make students more desirable ...
Integrated Computational Materials Engineering (ICME) for Metals, 2018
Integrated Computational Materials Engineering (ICME) for Metals, 2018
A method is proposed to explore the solution space of a metallurgical process with an aim to fost... more A method is proposed to explore the solution space of a metallurgical process with an aim to foster material innovation through simulation based design. The efficacy of the method is demonstrated in the context of hot rolling of the AA5083 alloy. The set-based design approach is employed to predict the process parameters of rolling operation for a given set of specified requirements. Critical process parameters such as strain rate, temperature, heat transfer coefficient and strip width are only considered in the design study. Ternary plots are constructed and utilized to explore the solution space obtained and thereby identifying feasible regions of process operation wherein the specified requirements are satisfied. Since plant data is not available for the study, Finite-element (FE) analysis is carried out as a means to validate the results obtained using aforesaid design method.
Journal of Mechanical Science and Technology, 2020
Unmatched in its diversity of applications, gears continue to be one of the most successful compo... more Unmatched in its diversity of applications, gears continue to be one of the most successful components used to transfer energy throughout a mechanical system. Certain project settings can require gears to meet more than one criterion to achieve optimal performance. In this paper, we proposed the simulation-based design synthesis using virtual simulations and material selection charts. For this, a computer-generated two gear mechanism is made to create a gear material selection chart, similar to an Ashby chart, that compares the desired conditions of angular velocity and torque. By utilizing computer software to personalize specifications, a gear design material selection chart can be constructed to expedite the material selection process for project environments and needs. Using this approach, gear designers and manufactures can promote design efficiency in the early stage of product development by flexibly determining possible material choices for their gear design based on the des...
Volume 1A: 38th Computers and Information in Engineering Conference, 2018
To save time and resources, many are making the transition to developing their ideas virtually. C... more To save time and resources, many are making the transition to developing their ideas virtually. Computer-aided gear production realization is becoming more and more desired in the industry. To produce gears with custom qualities, such as material, weight and shape, the trial and error approach has yielded the best results. However, trial and error is costly and time consuming. The computer-aided integrated design and manufacturing approach is intended to resolve these drawbacks. A simple one stage reduction spur gearbox is used as an example in a case study. First, the gear geometry is developed using computer aided design (CAD) modeling. Next, using MATLAB/Simulink, the gear assembly is connected virtually to other subsystems for system expectations and interaction analysis. Finally, using finite element analysis (FEA) tools such as ABAQUS, a dynamic FEA of the gear integration is completed to analyze the stress concentrations and gear tooth failures. Through this method of virtual...
The desire for all employers is to hire an engineer with all of the necessary experience needed t... more The desire for all employers is to hire an engineer with all of the necessary experience needed to perform the job with a high level of competence. Simulating this real-world experience in a classroom or lab becomes difficult when it has to be squeezed into a class like senior design. While for some, a good grade might be incentive enough to put forth the effort to properly gain these experiences, other things will likely become a larger priority. The SAE student design series introduces students to a competitive atmosphere that promotes extreme learning growth in a short period of time. Each portion of the competition has a specific aim that, when combined together, train a student into an engineer who is far more experienced and educated than one born from a traditional classroom. The opportunities that come from this competition, presented both to learn and grow more familiar with the real world environment of engineering are invaluable. It submerges students into an environment ...
SN Computer Science, 2020
Research in Sports Medicine, 2020
International Journal of Mechanical Engineering, 2020
2017 ASEE Annual Conference & Exposition Proceedings
Medicine & Science in Sports & Exercise, 2019
Journal of Computing and Information Science in Engineering, 2018
We hypothesize that by providing decision support for designers we can speed up the design proces... more We hypothesize that by providing decision support for designers we can speed up the design process and facilitate the creation of quality cost-effective designs. One of the challenges in providing design decision support is that the decision workflows embody various degrees of complexity due to the inherent complexity embodied in engineering systems. To tackle this, we propose a knowledge-based Platform for Decision Support in the Design of Engineering Systems (PDSIDES). PDSIDES is built on our earlier works that are anchored in modeling decision-related knowledge with templates using ontologies to facilitate execution and reuse. In this paper, we extend the ontological decision templates to a computational platform that provides knowledge-based decision support for three types of users, namely, template creators, template editors, and template implementers, in original design, adaptive design, and variant design, respectively. The efficacy of PDSIDES is demonstrated using a hot rod...
Journal of Mechanical Design, 2017
The steel manufacturing process is characterized by the requirement of expeditious development of... more The steel manufacturing process is characterized by the requirement of expeditious development of high quality products at low cost through the effective use of available resources. Identifying solutions that meet the conflicting commercially imperative goals of such process chains is hard using traditional search techniques. The complexity in such a problem increases due to the presence of a large number of design variables, constraints and bounds, conflicting goals and the complex sequential relationships of the different stages of manufacturing. A classic example of such a manufacturing problem is the design of a rolling system for manufacturing a steel rod. This is a sequential process in which information flows from first rolling stage/pass to the last rolling pass and the decisions made at first pass influence the decisions that are made at the later passes. In this context, we define horizontal integration as the facilitation of information flow from one stage to another ther...
Volume 2B: 42nd Design Automation Conference, 2016
The steel manufacturing process is characterized by the requirement of expeditious development of... more The steel manufacturing process is characterized by the requirement of expeditious development of high quality products at low cost through effective and judicious use of available resources. Identifying solutions that meet the conflicting commercially imperative goals of such process chains is hard using traditional search techniques. The complexity embedded in such a problem increases due to the presence of large number of design variables, constraints and bounds, conflicting goals and the complex sequential relationships of the different stages of manufacturing. A classic example of such a manufacturing problem is the design of a rolling system for manufacturing a steel rod. This is a sequential process in which information flows from first rolling stage/pass to last rolling pass and the decisions made at first pass influence the decisions that are made at the later passes. In this paper, we present a method based on well-established empirical models and response surface models d...
International Journal of Precision Engineering and Manufacturing-Green Technology, 2015
Volume 1B: 35th Computers and Information in Engineering Conference, 2015
The Decision Support Problem (DSP) construct is anchored in the notion that design is fundamental... more The Decision Support Problem (DSP) construct is anchored in the notion that design is fundamentally a decision making process. Key is the concept of two types of decisions (namely, selection and compromise) and that any complex design can be represented through modelling a network of compromise and selection decisions. In a computational environment the DSPs are modeled as decision templates. In this paper, modular, executable, reusable decision templates are proposed as a means to effect design and to archive design-related knowledge on a computer. In the context of the compromise Decision Support Problem (cDSP) we address two questions: 1. What are the salient features for facilitating the reuse of design decision templates? 2. What are the salient features that facilitate maintaining model consistency when reusing design decision templates? Here, the first question is answered by the identification of reuse patterns in which specific modifications of the existing cDSP templates a...
Journal of Software Engineering and Applications
Crouch gait is a motor complication commonly associated with cerebral palsy, spastic diplegia, st... more Crouch gait is a motor complication commonly associated with cerebral palsy, spastic diplegia, stroke, and motor-neurological pathologies, broadly defined as knee flexion in excess of 20° in the gait cycle. Uncorrected crouch gait results in fatigue, joint degradation, and loss of ambulation. Torsion springs have been used in cycling to store energy in knee flexion to reduce fatigue in the quadriceps during knee extension. SolidWorks was used to design a passive exoskeleton for the knee, incorporating torsion springs of stiffnesses 20,000 N/mm and 30,000 N/mm at the knee joint to correct four different crouch gaits. OpenSim was used to gather data from moments produced and knee angles from each crouch gait and the normal gait. Motion analysis of the exoskeleton was simulated using knee angles for each crouch gait and compared with moments produced with the normal gait moments in the stance phase of the gait cycle. All crouch gait moments were significantly reduced, and the correctio...
This project asked engineering students to develop a multi-subsystem design that would produce el... more This project asked engineering students to develop a multi-subsystem design that would produce electricity. Students over the duration of this project learned how to simulate and design systems theoretically using computer tools. Furthermore, students were expected to produce a prototype of their model, thereby self-analyzing the practicality levels and enhancing learning. With the technology available to students advancing, systems integration techniques become more efficient learning experiences to the students. The benefits of systems integration can also be expanded to the professional world these students will soon step into. Therefore, teaching these techniques now will give students a better further insight on real world experience in a classroom setting. When students make the expected leap into the job market, it is important for them to have a solid understanding of system integration and multi-system design. It is this understanding that will make students more desirable ...
Integrated Computational Materials Engineering (ICME) for Metals, 2018
Integrated Computational Materials Engineering (ICME) for Metals, 2018
A method is proposed to explore the solution space of a metallurgical process with an aim to fost... more A method is proposed to explore the solution space of a metallurgical process with an aim to foster material innovation through simulation based design. The efficacy of the method is demonstrated in the context of hot rolling of the AA5083 alloy. The set-based design approach is employed to predict the process parameters of rolling operation for a given set of specified requirements. Critical process parameters such as strain rate, temperature, heat transfer coefficient and strip width are only considered in the design study. Ternary plots are constructed and utilized to explore the solution space obtained and thereby identifying feasible regions of process operation wherein the specified requirements are satisfied. Since plant data is not available for the study, Finite-element (FE) analysis is carried out as a means to validate the results obtained using aforesaid design method.
Journal of Mechanical Science and Technology, 2020
Unmatched in its diversity of applications, gears continue to be one of the most successful compo... more Unmatched in its diversity of applications, gears continue to be one of the most successful components used to transfer energy throughout a mechanical system. Certain project settings can require gears to meet more than one criterion to achieve optimal performance. In this paper, we proposed the simulation-based design synthesis using virtual simulations and material selection charts. For this, a computer-generated two gear mechanism is made to create a gear material selection chart, similar to an Ashby chart, that compares the desired conditions of angular velocity and torque. By utilizing computer software to personalize specifications, a gear design material selection chart can be constructed to expedite the material selection process for project environments and needs. Using this approach, gear designers and manufactures can promote design efficiency in the early stage of product development by flexibly determining possible material choices for their gear design based on the des...
Volume 1A: 38th Computers and Information in Engineering Conference, 2018
To save time and resources, many are making the transition to developing their ideas virtually. C... more To save time and resources, many are making the transition to developing their ideas virtually. Computer-aided gear production realization is becoming more and more desired in the industry. To produce gears with custom qualities, such as material, weight and shape, the trial and error approach has yielded the best results. However, trial and error is costly and time consuming. The computer-aided integrated design and manufacturing approach is intended to resolve these drawbacks. A simple one stage reduction spur gearbox is used as an example in a case study. First, the gear geometry is developed using computer aided design (CAD) modeling. Next, using MATLAB/Simulink, the gear assembly is connected virtually to other subsystems for system expectations and interaction analysis. Finally, using finite element analysis (FEA) tools such as ABAQUS, a dynamic FEA of the gear integration is completed to analyze the stress concentrations and gear tooth failures. Through this method of virtual...
The desire for all employers is to hire an engineer with all of the necessary experience needed t... more The desire for all employers is to hire an engineer with all of the necessary experience needed to perform the job with a high level of competence. Simulating this real-world experience in a classroom or lab becomes difficult when it has to be squeezed into a class like senior design. While for some, a good grade might be incentive enough to put forth the effort to properly gain these experiences, other things will likely become a larger priority. The SAE student design series introduces students to a competitive atmosphere that promotes extreme learning growth in a short period of time. Each portion of the competition has a specific aim that, when combined together, train a student into an engineer who is far more experienced and educated than one born from a traditional classroom. The opportunities that come from this competition, presented both to learn and grow more familiar with the real world environment of engineering are invaluable. It submerges students into an environment ...
SN Computer Science, 2020
Research in Sports Medicine, 2020
International Journal of Mechanical Engineering, 2020
2017 ASEE Annual Conference & Exposition Proceedings
Medicine & Science in Sports & Exercise, 2019
Journal of Computing and Information Science in Engineering, 2018
We hypothesize that by providing decision support for designers we can speed up the design proces... more We hypothesize that by providing decision support for designers we can speed up the design process and facilitate the creation of quality cost-effective designs. One of the challenges in providing design decision support is that the decision workflows embody various degrees of complexity due to the inherent complexity embodied in engineering systems. To tackle this, we propose a knowledge-based Platform for Decision Support in the Design of Engineering Systems (PDSIDES). PDSIDES is built on our earlier works that are anchored in modeling decision-related knowledge with templates using ontologies to facilitate execution and reuse. In this paper, we extend the ontological decision templates to a computational platform that provides knowledge-based decision support for three types of users, namely, template creators, template editors, and template implementers, in original design, adaptive design, and variant design, respectively. The efficacy of PDSIDES is demonstrated using a hot rod...
Journal of Mechanical Design, 2017
The steel manufacturing process is characterized by the requirement of expeditious development of... more The steel manufacturing process is characterized by the requirement of expeditious development of high quality products at low cost through the effective use of available resources. Identifying solutions that meet the conflicting commercially imperative goals of such process chains is hard using traditional search techniques. The complexity in such a problem increases due to the presence of a large number of design variables, constraints and bounds, conflicting goals and the complex sequential relationships of the different stages of manufacturing. A classic example of such a manufacturing problem is the design of a rolling system for manufacturing a steel rod. This is a sequential process in which information flows from first rolling stage/pass to the last rolling pass and the decisions made at first pass influence the decisions that are made at the later passes. In this context, we define horizontal integration as the facilitation of information flow from one stage to another ther...
Volume 2B: 42nd Design Automation Conference, 2016
The steel manufacturing process is characterized by the requirement of expeditious development of... more The steel manufacturing process is characterized by the requirement of expeditious development of high quality products at low cost through effective and judicious use of available resources. Identifying solutions that meet the conflicting commercially imperative goals of such process chains is hard using traditional search techniques. The complexity embedded in such a problem increases due to the presence of large number of design variables, constraints and bounds, conflicting goals and the complex sequential relationships of the different stages of manufacturing. A classic example of such a manufacturing problem is the design of a rolling system for manufacturing a steel rod. This is a sequential process in which information flows from first rolling stage/pass to last rolling pass and the decisions made at first pass influence the decisions that are made at the later passes. In this paper, we present a method based on well-established empirical models and response surface models d...
International Journal of Precision Engineering and Manufacturing-Green Technology, 2015
Volume 1B: 35th Computers and Information in Engineering Conference, 2015
The Decision Support Problem (DSP) construct is anchored in the notion that design is fundamental... more The Decision Support Problem (DSP) construct is anchored in the notion that design is fundamentally a decision making process. Key is the concept of two types of decisions (namely, selection and compromise) and that any complex design can be represented through modelling a network of compromise and selection decisions. In a computational environment the DSPs are modeled as decision templates. In this paper, modular, executable, reusable decision templates are proposed as a means to effect design and to archive design-related knowledge on a computer. In the context of the compromise Decision Support Problem (cDSP) we address two questions: 1. What are the salient features for facilitating the reuse of design decision templates? 2. What are the salient features that facilitate maintaining model consistency when reusing design decision templates? Here, the first question is answered by the identification of reuse patterns in which specific modifications of the existing cDSP templates a...