• Title/Summary/Keyword: Input-Output Model

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A Hierarchical RAM Simulation Model Framework (계층적 RAM 시뮬레이션 모델 프레임워크)

  • Kim, Hye-Lyeong;Choi, Sang-Yeong
    • Journal of the Korea Institute of Military Science and Technology
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    • v.13 no.1
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    • pp.41-49
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    • 2010
  • In this paper, we propose a hierarchical RAM simulation model framework which are used to analyze the RAM specifications on the concept refinement phase. The hierarchical RAM simulation model framework consists of RAM simulation models, class library and each model's input and output data lists. The hierarchical RAM simulation models are co-operated with 3 kinds of model - type I, II, III. Type I, II models are used to analyze the target operational availability and Type III is used to establish the initial RAM specifications. Each model's input and output data lists are defined by considering each model's purpose of RAM analysis. The class library is arranged with each model's classes for implementing the hierarchical simulation models. The proposed framework may be applied for executing the RAM activities effectively.

EXPERIMENT AND SIMULATION OF A WIND-DRIVEN REVERSE OSMOSIS DESALINATION SYSTEM

  • Park, Sang-Jin;Clark C.K. Liu
    • Water Engineering Research
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    • v.4 no.1
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    • pp.1-17
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    • 2003
  • A mathematical model was developed to simulate the performance of a prototype wind-powered reverse osmosis desalination system. The model consists of two sub-models operated in a series. The first sub-model is the wind-energy conversion sub-model, which has wind energy and feed water as its input and pressurized feed water as its output. The second sub-model is a reverse osmosis (RO) process sub-model, with pressurized feed water as its input and the flow and salinity of the product water or permeate as its output. Model coefficients were determined based on field experiments of a prototype wind powered RO desalination system of the University of Hawaii, from June to December 2001. The mathematical model developed by this study predicts the performance of wind-powered RO desalination systems under different design conditions. The system optimization is achieved using a linear programming approach. Based on the results of system optimization, a design guide is prepared, which can be used by both manufacturer and end-user of the wind-driven reverse osmosis system.

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Controller of nonlinear servo system

  • Yamane, Yuzo;Zhang, Xiajun
    • 제어로봇시스템학회:학술대회논문집
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    • 1996.10a
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    • pp.342-345
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    • 1996
  • This paper is dealing with a design of linear controller so that the plant output is regulated to follow a reference model output when the plant equation is described by a class of nonlinear time-varying control systems.

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Input-Output Feedback Linearizing Control With Parameter Estimation Based On A Reduced Design Model

  • Noh, Kap-Kyun;Dongil Shin;Yoon, En-Sup
    • 제어로봇시스템학회:학술대회논문집
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    • 2001.10a
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    • pp.87.2-87
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    • 2001
  • By the state transformation including independent outputs functions, a nonlinear process model can be decomposed into two subsystems; the one(design model) is described in output variables as new states and used for control system synthesis and the other(disturbance model) is described in the original unavailable states and its couplings with the design model are treated as uncertain time-varying parameters in the design model. Its existence with respect to the design model is ignored. So, the design model is an uncertain time-variant system. Control synthesis based on a reduced design model is a combined ...

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Design of Human Works Model for Gantry Crane System

  • Kim, Hwan-Seong;Tran, Hoang-Son;Kim, Seoung-Ho
    • Proceedings of the Korean Institute of Navigation and Port Research Conference
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    • 2004.08a
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    • pp.102-112
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    • 2004
  • In this paper, we propose a human model for analysis for human work pattern or human fault, where a gantry crane simulator is used to survey the property of human operation. From the input and output of gantry crane response, we make a human operation model by using conventional ARX identification method. For identify the human model, we assume the eight inputs and two outputs. By using the input/output data, we estimate the parameters of ARX of the human system model. For verify the proposed method, we compared the real data with the modeled data, where three kinds of work trajectory path are used.

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Development of A Multi-Period Integration DEA Model Considering Time Lag Effect (시간지연 효과를 고려한 기간 통합 DEA 모형의 개발)

  • Zhang, Yanshuang;Jeong, Byung Ho
    • Journal of the Korean Operations Research and Management Science Society
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    • v.37 no.4
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    • pp.37-50
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    • 2012
  • The existing DEA models have been devoted to evaluate relative efficiency of DMUs based on multiple input and output factors of a same period. However, a certain kind of lead time can be required to produce outputs using inputs in an organization. R&D evaluation is a typical area with this kinds of time lag. Thus, the purpose of this paper is to develop a new DEA model to deal with time lag effect in performance evaluation. The proposed model is to find relative efficiency of each DMU for each period considering the time lag effect. A case example using a real data set is also given to show the usage or implication of the suggested model. The results are compared with the ones of the CCR model and the multi-periods input model.

The Effects of Noise/Signal Ratios on Noise/Energy Source Identification in Linear Systems (선형계에 있어서의 잡음/신호비가 소음/진동원 규명에 미치는 영향)

  • 박정석;김광준;이종원
    • Transactions of the Korean Society of Mechanical Engineers
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    • v.15 no.6
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    • pp.1819-1830
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    • 1991
  • The problems associated with noise/energy source identification using multiple input/single output model in linear systems are investigated. Partial coherence function is formulated for the model introducing a virtual force and extraneous noises into the conventional two input/single output system. The analytical results show that the partial coherence function in two input/single output linear system is the function of noise/signal ratios when multiple inputs are mutually coherent and extraneous noises exist. Parametric studies for ordinary and partial coherence functions are carried out to demonstrate the effects of noise/signal ratios for these functions.

An Economic Evaluation about Research and Development for Renewable energy in Korea (대체에러지 기술개발에 대한 수익성 평가분석)

  • 전영서;김진오
    • Journal of Korea Technology Innovation Society
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    • v.7 no.2
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    • pp.325-349
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    • 2004
  • This paper tried to evaluate an economic analysis about research and development far areas of renewable resource in Korea. To evaluate this validity, we tried to calculate the spillover effect of R&D investment through input-output table. In the first stage of spillover effect, we simply calculate the rate of return on R&D investment for renewable energy resources in Korea through the input-output model, which can calculate the value added as well as output based upon the price of 2000 year. According to the first stage calculation, the rate of return on R&B investment in solar heat is higher than any other renewable energy. In the second stage we tried to calculate the second round of spill over effect, which derives from the additional amount of supply of renewable resources due to the R&D investment. The overall evaluation of R&D invesment including the first stage as well as second stage spillover effect shows that bio-energy and waste energy generate 14 times as well as 2.5 times in the rate of return respectively.

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Estimating the Economic Impact of '2011 Seoul Motor Show' Using Regional Input-Output Model: Based on Expenditures of Exhibition Attendees (지역산업연관모델을 이용한 '2011 서울모터쇼'의 경제적 파급효과 분석: 전시참관객의 지출액을 바탕으로)

  • Kim, Dae-Kwan;Han, Youn-Joo;Lee, Sang-Min;Choe, Yeong-Bae;Song, Soo-Yeop
    • The Journal of the Korea Contents Association
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    • v.11 no.10
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    • pp.187-196
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    • 2011
  • This study aimed to estimate the economic impact of the '2011 Seoul Motor Show' using a direct survey-based regional input-output(I-O) model. Based on the regional I-O table, Exhibition multipliers were derived with respect to output, income, employment, value-added and indirect tax. Attendees' survey was conducted to estimate per capita expenditure. The results of this study indicated that all attendees of '2011 Seoul Motor Show' generated 53.1 billion Won of output impact, 11.7 billion Won of income impact, 24.1 billion Won of Value-added impact, 2.6 billion Won of tax impact, and 1,030 part-time and full-time jobs throughout direct and indirect effects. Another result of this study was that output multiplier of the exhibition industry was similar with other industries, however, income, employment and value-added multipliers were relatively larger than those of other industries.