• Title/Summary/Keyword: industrial dynamics model

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A Structural Model of Intra-Organizational Diffusion of Information Technology: Firm′s Database System Adoption

  • Hyun, Jung-Suk
    • Journal of Korean Society of Industrial and Systems Engineering
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    • v.22 no.53
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    • pp.55-67
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    • 1999
  • The objectives of the study are to build a structural model of intra-organizational diffusion of information technology and to test this model. Data were collected from senior managers of the purchasing department through questionnaires and statistically analyzed using the structural equation modeling. The questionnaires were concerning firm's database system adoption. Key findings of the study are as follows. First, buying center dynamics (i.e., buying center decision centrality, participation in buying center, and top-management support) are substantially related to the intra-organizational diffusion. Second, environmental characteristics (i.e., market turbulence, technological turbulence, and competitive intensity) indirectly affect on intra-organizational diffusion via buying center dynamics.

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Design Optimization on Wastewater Treatment Pump of Satisfaction for High Head and Low Flow Rate (고양정 및 저유량을 만족하는 폐수처리용 펌프 설계 최적화)

  • KIM, SUNG;KIM, JIN-HYUK
    • Journal of Hydrogen and New Energy
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    • v.33 no.5
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    • pp.583-590
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    • 2022
  • In this paper, the performance characteristics of the 2 vane pump for wastewater treatment were investigated using response surface method(RSM) with commercial computation fluid dynamics(CFD) software. Design variables of wastewater treatment pump were defined with the meridional plane of the 2 vane pump impeller. The objective functions were defined as the total head and the efficiency at the design flow rate. The hydraulic performance of optimum model was verified by numerical analysis and the reliability of the model was retained by comparison of numerical analysis and comparative analysis with the reference model.

Design Optimization on Sensor Condenser of Heat Exchanger Cleaning System for Improved Flow Uniformity (유동 균일성 향상을 위한 열교환기 세정 시스템용 센서 콘덴서 설계 최적화)

  • SOON-YOUNG JEONG;SUNG KIM
    • Journal of Hydrogen and New Energy
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    • v.35 no.4
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    • pp.377-383
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    • 2024
  • In this paper, the flow uniformity improvement and flow characteristic of the sensor condenser for a heat exchanger cleaning system were studied using response surface method and computational-fluid-dynamics. The design variable was defined as a shape for controllable sensor condenser area. The objective functions were defined as the improvement of flow uniformity in heat exchanger cleaning system tubes. The flow uniformity improvement and flow characteristic of optimum model was verified by numerical analysis and the reliability of the model was retained by comparison of numerical analysis and comparative analysis with the reference model.

The Default Risk of the Research Funding with Uncertain Variable in South Korea, Along with the Greeks (옵션민감도를 고려한 기술자금의 경제적 가치와 실패확률)

  • Sim, Jaehun
    • Journal of Korean Society of Industrial and Systems Engineering
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    • v.44 no.1
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    • pp.1-8
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    • 2021
  • As a nation experiencing rapid economic growth, South Korea and its government have made a continuous effort toward efficient research investments to achieve transformation of the Korean industry for the fourth industrial revolution. To achieve the maximum effectiveness of the research investments, it is necessary to evaluate its funding's worth and default risk. Thus, incorporating the concepts of the Black-Scholes-Merton model and the Greeks, this study develops a default-risk evaluation model in the foundation of a system dynamics methodology. By utilizing the proposed model, this study estimates the monetary worth and the default risks of research funding in the public and private sectors of Information and Communication technologies, along with the sensitivity of the R&D economic worth of research funding to changes in a given parameter. This study finds that the public sector has more potential than the private sector in terms of monetary worth and that the default risks of three types of research funding are relatively high. Through a sensitivity analysis, the results indicate that uncertainty in volatility, operation period, and a risk-free interest rate has trivial impacts on the monetary worth of research funding, while volatility has large impacts on the default risk among the uncertain factors.

The Economic Value Analysis of the Potential Wind Farm Site Using the Black-Scholes Model (블랙 숄즈 모델을 이용한 잠재적 풍력발전 위치의 경제적 가치분석)

  • Jaehun Sim
    • Journal of Korean Society of Industrial and Systems Engineering
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    • v.45 no.4
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    • pp.21-30
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    • 2022
  • To mitigate the environmental impacts of the energy sector, the government of South Korea has made a continuous effort to facilitate the development and commercialization of renewable energy. As a result, the efficiency of renewable energy plants is not a consideration in the potential site selection process. To contribute to the overall sustainability of this increasingly important sector, this study utilizes the Black-Scholes model to evaluate the economic value of potential sites for off-site wind farms, while analyzing the environmental mitigation of these potential sites in terms of carbon emission reduction. In order to incorporate the importance of flexibility and uncertainty factors in the evaluation process, this study has developed a site evaluation model focused on system dynamics and real option approaches that compares the expected revenue and expected cost during the life cycle of off-site wind farm sites. Using sensitivity analysis, this study further investigates two uncertainty factors (namely, investment cost and wind energy production) on the economic value and carbon emission reduction of potential wind farm locations.

A System Dynamics Study of Enterprise Value $Creation{\sim}$ the Example of Taiwan's SMEs

  • Chung, Yi-Chan;Tsai, Chih-Hung;Tien, Shiaw-Wen;Lin, Yu-Hsin;Lin, Ja-Lin
    • International Journal of Quality Innovation
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    • v.7 no.1
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    • pp.128-160
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    • 2006
  • With the globalization of economy, industries are facing increasingly greater challenges. Business integration, both internally and externally, is undoubtedly an important topic. However, how does an enterprise create its own value will be the key to an enterprise's success in the future. Therefore, this study bases on the evaluation of company value to assess the key factors and competitive strategies of an enterprise. Yet, only with stable enterprise performance can the company value be correctly evaluated. This will be an important issue for enterprise performance and business strategy. Subject of this study are mainly small and medium-sized (enterprises (SMEs). Model construction for SME value assessment is established through the system dynamics approach. Scholars' opinions on literature validation and application of Delphi Method are explored through literature review on local and foreign studies, in order to compile the relevant perspectives and indices for enterprise value creation. Hence model construction of the value creation system is established, and the correlation between the perspectives and related factors is explored to understand the overall dynamics model of SMEs' value creation system. Consequently, a research method based on the system dynamics perspective is provided for the study of enterprise value creation is provided, as policy reference for improvement of decision-making and value creation.

Development of Business Models for the Robot Industry in the Convergence Age (컨버전스 시대의 로봇산업 비즈니스 모델 개발)

  • Seo, Kwang-Kyu
    • Proceedings of the KAIS Fall Conference
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    • 2008.05a
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    • pp.354-357
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    • 2008
  • In this paper, we develop business models for the robot industry that facilitates to explore new business opportunities in the convergence age. Considering the trend of convergence society, we analyze the market drivers. Analyzing market dynamics and value chain, we design a set of the business model for the robot industry focused on u-health robots. In addition, we describe the evolution path of the proposed business model in terms of technology development and market. Finally, we develop a framework for evaluating the effectiveness of the business model.

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Study on the Cooperation Model for Fusion-Technology Development in SMEs (융합기술 개발을 위한 중소기업 간 협업모형 제안)

  • Cho, Chanwoo;Lee, Sungjoo
    • Journal of Korean Institute of Industrial Engineers
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    • v.39 no.3
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    • pp.198-203
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    • 2013
  • Industry convergence is the inexorable trend, which has become a fundamental concept to understand the industrial dynamics and to develop business strategies. However, most of the previous studies on convergence have dealt with the issues at the macro-level (technology- or industry-level), little attention has been paid to the analysis of convergence at the micro level (firm-level). Recognizing that firms are the principal agents that develop fusion technologies, it is encouraged to help firms to work together for technology convergence. Therefore, this research proposes a collaboration model for SMEs, since SMEs tend to have novel ideas and are flexible enough to make fusion-technology. To do this, we conducted a survey for Korean SMEs and analyzed their successful cases of collaboration, which was used as a basis to develop the model. The research results will help develop strategy or policy to promote the collaboration between SMEs and ultimately to make a fusion-technology.

NUMERICAL DISCRETIZATION OF A POPULATION DIFFUSION EQUATION

  • Cho, Sung-Min;Kim, Dong-Ho;Kim, Mi-Young;Park, Eun-Jae
    • Journal of the Korean Society for Industrial and Applied Mathematics
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    • v.14 no.3
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    • pp.189-200
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    • 2010
  • A numerical method is proposed and analyzed to approximate a mathematical model of age-dependent population dynamics with spatial diffusion. The model takes a form of nonlinear and nonlocal system of integro-differential equations. A finite difference method along the characteristic age-time direction is considered and primal mixed finite elements are used in the spatial variable. A priori error estimates are derived for the relevant variables.

Stability/Robustness of TDC for SISO Systems with Significant Unmodelled Dynamics (불확실성을 갖는 단일입출력 시스템에 대한 TDC의 안정성/강인성 해석)

  • Lee, Jeong Wan
    • Journal of Industrial Technology
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    • v.20 no.B
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    • pp.35-43
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    • 2000
  • Time Delay Control (TDC) method was proposed as a promising technique in the robust control area, where the plants have unknown dynamics with parameter variations and substantial disturbances are present. In this paper, based on the concepts of TDC, author propose a model reference control method for input/output model. The stability and robustness of the closed system has been analyzed for a class of linear time invarient (LTI) system. Then, in a simulation study, author's design method has been applied to a second order system, the result of which confirmed that the proposed control method performs satisfactorily as predicted.

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