Informatics Publishing Limited

Jeongho Cho ¹, Dong-Gi Kwag ², Byung-Seo Kim ³

Affiliations
1 Department of Avionics Engineering, Hanseo University, Taean-gun - 357-953, KR
2 Department of Aeromechanical Engineering, Hanseo University, Taean-gun - 357-953, KR
3 Department of Computer and Information Communication Engineering, Hongik University, Sejong City - 339-701, KR

Abstract

This paper presents a modeling strategy using prototypes in manifold forms for unknown chaotic behaviors, observed possibly in power electronics, robot manipulators, lasers, etc.; it models from only a finite number of one dimensional time series observables in order to simplify both the modeling and the controller design. With the intention of dividing the operating space into a set of smaller regions, the Self-Organizing Map (SOM) is employed as a modeling groundwork and prototypes in manifold forms attached to the SOM are created in the least square sense for each region. Once a set of prototypes representing the operating space is established, the regional controllers associated with the prototypes are designed with a traditional PID control law. Switching of the controllers is done synchronously by the SOM, which chooses the regional operating space, linked with an active regional prototype valid in a certain operating regime. Simulations on the chaotic oscillator regulating the unknown chaos to a fixed point or a stable periodic orbit illustrate the efficiency of the proposed modeling and control architecture.

Keywords

Chaotic Resonance, Modeling, PID Control, Self-Organizing Map

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Han-Seop Jeong ¹, Dong-Gi Kwag ¹, Jin-Bong Kim ¹, Jean-Ho Park ²

Affiliations
1 Department of Aeromechanical Engineering, Hanseo University, Taean-gun, South Korea
2 Micro Nano Scale Manufacturing Group, Korea Institute of Industrial Technology, Ansan-si, South Korea

Abstract

Objectives: The wide variety of possible work excavator, a large vibration occurs in small movements. The main purpose is to damp the vibrations of the excavator of the working device. Methods/Statistical Analysis: In order to verify the damping performance of the excavator of the working device, using the vibration analysis of the working device model, it was to understand the dynamic characteristics. In addition, this study sought a way to reduce vibration caused by the excavator working device using TMD (Tuned Mass Damper). In this study, it conducted a study on the dynamic stability of the excavator of the working device. Findings: It was determined the dynamic characteristics (natural frequencies and mode shapes) of the excavator working device through the modal analysis. In addition, using a numerical analysis, it was possible to determine the vibrational response from the working device. By using this, comparative analysis for vibrational response of the applied the TMD excavator and apply to not excavator. Depending on the vibration damping, and proposed that it is possible to design a more stable excavator. Improvements/Applications: It is suitable for the design of the excavator working device in consideration of the dynamic stability and vibration reduction. In addition, to reduce the operator’s fatigue caused by the vibration of the excavator.

Keywords

Damped Vibration, Dynamic Stability, Excavator, Tuned Mass Damper, Working Device.

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Sung-Uk Bae ¹, Dong-Gi Kwag ², Eun-Young Park ³

Affiliations
1 Korea Business Angels Association, KR
2 Department Aeromechanical Engineering, Hanseo University, KR
3 Korea Institute of Industrial Technology

Abstract

Objectives: Survey of aerospace-related major students was conducted to evaluate their satisfaction levels (or importance levels) for the various curriculum and support systems of convergence-oriented talent development. Methods/Statistical Analysis: Statistical forecast analysis software IBM SPSS (Statistical Package for the Social Sciences) was utilized for the research data of the aerospace major students' understanding of their curriculum. This data can be used as base data for future curriculum settings. Findings: The difference between this study and prior research on convergence curriculum is as follows. First, whereas the subject of previous research was convergence education based on the convergence of disparate fields of study, this research dealt specifically with the aerospace field where cutting-edge technologies converge. Second, while previous studies focused on the general direction of convergence education and its teachers, this research proposed a direction for convergence education from the learners' point of view. Application/Improvements: The research analyzed which factors affected the development of convergence-oriented talent development. The results may be used for the future planning and establishment of education programs to facilitate convergence-oriented talent development.

Keywords

Aerospace Sector, Convergence Education, Curriculum, Education System, PASW Statistic.

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Eun-Young Park ¹, Dong-Gi Kwag ², Sung-Uk Bae ³

Affiliations
1 Korea Institute of Industrial Technology, KR
2 Department of Aeromechanical Engineering, Hanseo University, KR
3 Korea Business Angels Association, KR

Abstract

Background/ Objectives: Businesses in the industrial era of the past could operate under a business model limited to surviving in a single industry by focusing on technological development centered on manufacturing. However, in the present, convergence of various industries and technologies has become prominent and market conditions have come to represent customer-centric thinking, leading to an increased tendency to view the corporate environment as more complex. Methods/Statistical Analysis: This paper seeks to first review the existing research on the convergence industry, business models and customer-centric product realization, and then propose a CBMI model that can vitalize the convergence of small-to-medium sized businesses. The intended methodology for CBMI shall consider the specific characteristics of small-to-medium and venture companies, and focus on simplicity and easy applicability to develop a business model necessary for the planning and commercialization of convergent products. Findings: CBMI methodology aims to propose consists of three stages – establishment of the CBMI scope and design guidelines, formation of an interactive communication channel, and proposition of an innovation process. This process leads to the implementation of the CBMI value flow optimized model. The first stage, by analyzing the business environment within the industry/market to reflect convergence trends and corresponding competitive strategies, establishes the scope of CBMI and the guidelines for activities such as new business model design. The second stage is when customer value may be maximized by establishing an interactive communication channel between the supplier and customers in order to reflect customer needs. It is proposed as an innovation process strategy that includes the process of customer feedback being provided to the supply channel before the final outcome of the product or service reaches the customers. For the third stage includes the supplier-customer interactive communication channel as the convergent element, the business process of how the final outcome is delivered to the customer. Application/Improvements: The concept of CBMI presented in this paper aims to enhance corporate capabilities by merging conventional business models with the current competitive trend of convergence, allowing a cultivation of competitive advantage and the establishment of innovation processes. It is believed that the proposed methodology will be helpful in presenting a strategy for the resurgence of small-to-medium sized businesses, which are facing changing business environments due to intensifying competition and heightened uncertainty.

Keywords

Convergence, Convergence Business Model Innovation, Small-to-Medium Sized Businesses, User Centered Process.

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