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  • Title/Summary/Keyword: 기초모델

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Adaptive Fuzzy IMM Algorithm for Position Tracking of Maneuvering Target (기동표적의 위치추적을 위한 적응 퍼지 IMM 알고리즘)

  • Kim, Hyun-Sik
    • Journal of the Korean Institute of Intelligent Systems
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    • v.17 no.7
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    • pp.855-861
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    • 2007
  • In real system application, the IMM-based position tracking algorithm requires robust performance, less computing resources and easy design procedure with respect to the uncertain target maneuvering, To solve these problems, an adaptive fuzzy interacting multiple model (AFIMM) algorithm, which is based on the well-defined basis sub-models and well-adjusted mode transition probabilities (MTPs), is proposed. Simulation results show that the proposed algorithm effectively solves the problems in the real system application of the IMM-based position tracking algorithm.

Nonlinear Finite Element Analysis of Foundation with Shear Reinforcements on the Ground (전단보강된 기초의 지반에서의 거동해석)

  • Yi, Waon-Ho;Lee, Yong-Jae;HwangBo, Seok;Yang, Won-Jik;Heo, Kab-Soo;Jin, Seong-Chan
    • Proceedings of the Computational Structural Engineering Institute Conference
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    • 2011.04a
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    • pp.615-618
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    • 2011
  • 최근 건설공사에서 많은 물량이 투입되는 기초구조의 자재비 및 원가절감을 위해 여러 가지 기초구조시스템이 개발되고 있으나, 보편적으로 현장에 적용하기에는 다소 무리가 있는 것으로 지적받고 있다. 본 연구는 강판을 ㄷ자형으로 절곡한 기초전단보강시스템을 개발하기 위한 해석적 연구의 일환으로 진행되었다. 현행 전단머리 보강식에서는 기초판에 대한 전단내력 산정을 위한 기준식이 마련되어 있지 않으며 플랫플레이트 슬래브의 기준식에 따르도록 되어져있다. 그러나 기초판은 지반에 지지되는 구조물로 플랫플레이트 슬래브와는 경계조건이 다르다. 따라서 본 연구에서는 지반에 지지된 경우와 플랫플레이트 슬래브와 같이 모멘트 제로지점을 단순지지한 형태로 기초구조물을 모델링하여 해석을 실시하였다. 해석프로그램은 유한 요소기법이 적용된 ABAQUS를 사용하여 두 지지조건의 차이가 구조물에 미치는 영향을 비교분석하였다.

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Estimation of Chemical Flame Height based on Fuel Consumption in a Fire Field Model (필드모델에서 연료소모에 기초한 화학적 화염높이 산정)

  • Kim, Sung-Chan
    • Fire Science and Engineering
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    • v.30 no.2
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    • pp.92-97
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    • 2016
  • The present study has been conducted to estimate the chemical flame height based on fuel consumption in fire field model. The calculation algorithms based on cumulative fraction of HRRPUL and fuel concentration along the z axis were applied to the results predicted by Fire Dynamics Simulator (FDS) version 6.3.2 and the mean chemical flame height was obtained by time averaging of instantaneous flame height with the algorithms. The mean flame height calculated by fuel concentration was quite well matched with that of cumulative value of HRRPUL within 10% over-prediction. This study contribute to a more detailed understanding of fire behavior and quantitative evaluation of flame height in the computational fire model.

Midship Section Design of Ship Structures Based on Reliability Analysis (신뢰성 해석에 기초한 선체 중앙단면 설계)

  • Lee, Joo-Sung
    • Journal of the Computational Structural Engineering Institute of Korea
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    • v.24 no.5
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    • pp.507-512
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    • 2011
  • This study is concerned with the reliability analysis and its based design of midship section against the ultimate bending strength. Eight bulk carriers and seven oil tankers over 100m length are chosen for the present study. Target reliability indices for the two ship types have been derived based on the results reliability analysis of the present ship models. Reliability-based structural design codes are proposed for use in design of midship section of bulk carriers and oil tankers. The design codes proposed in this study have been successfully applied to re-design of midship section of the present ship types. It has been found that the proposed codes can provide more uniform structural design results.

Automated Measurement Method for Construction Errors of Reinforced Concrete Pile Foundation Using a Drones (드론을 활용한 철근콘크리트 말뚝기초 시공 오차 자동화 측정 방법)

  • Seong, Hyeonwoo;Kim, Jinho;Kang, HyunWook
    • Korean Journal of Construction Engineering and Management
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    • v.23 no.2
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    • pp.45-53
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    • 2022
  • The purpose of this study is to present a model for analyzing construction errors of reinforced concrete pile foundations using drones. First, a drone is used to obtain an aerial image of the construction site, and an orthomosaic image is generated based on those images. Then, the circular pile foundation is automatically recognized from the orthomosaic image by using the Hough transform circle detection method. Finally, the distance is calculated based on the the center point of the reinforced concrete pile foundation in the overlapped data. As a case study, the proposed concrete concrete pile foundation construction quality control model was applied to the real construction site in Incheon to evaluate the proposed model.

Master Integrity Principle for Effective Management of Role Hierarchy (효과적인 역할계층 관리를 위한 기본 무결성 규칙)

  • Oh Se-Jong
    • The KIPS Transactions:PartC
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    • v.12C no.7 s.103
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    • pp.981-988
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    • 2005
  • Administrative Role-Based Access Control(ARBAC) is a typical model for decentralized authority management by plural security administrators. They have their work range on the role hierarchy. A problem is that legal modification of role hierarch may induce unexpected side effect. Role-Role Assignment 97(RRA97) model introduced some complex integrity principles to prevent the unexpected side effect based on geometric approach. We introduce simple and new one integrity principle based on simple set theory. It is simple and intuitive. It can substitute for all integrity principles of RRA97 model.

Model Estimation and Precise Position Control of an Antagonistic Actuation with Pneumatic Artificial Muscles (공압형 인공근육을 이용한 상극 구동의 모델 추정 및 정밀 위치제어)

  • Kang, Bong-Soo
    • Transactions of the Korean Society of Mechanical Engineers A
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    • v.35 no.5
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    • pp.533-541
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    • 2011
  • This paper presents a frequency-response test performed on an antagonistic actuation system consisting of two Mckibben pneumatic artificial muscles and a pneumatic circuit with pressure valves. Varying switching frequency to pressure valves from 0.1 Hz to 5 Hz, parameters of a linear model were estimated optimally to predict dynamic characteristics of the antagonistic actuation. A model-base control scheme with estimated parameters was built for the precise trajectory tracking of the antagonistic structure and realized on a reconfigurable embedded control system, CompactRIO. Experimental results showed that the proposed model-based control scheme gave good performance in trajectory tracking comparing with a PD control scheme when square wave and sinusoidal wave were given as references to follow.

Testing Non-Stationary Relationship between the Proportion of Green Areas in Watersheds and Water Quality using Geographically Weighted Regression Model (공간지리 가중회귀모형(GWR)을 이용한 유역 녹지비율과 하천수질의 비균질적 관계 검증)

  • Lee, Sang-Woo
    • Journal of the Korean Institute of Landscape Architecture
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    • v.41 no.6
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    • pp.43-51
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    • 2013
  • This study aims to examine the presence of non-stationary relationship between water quality and land use in watersheds. In investigating the relationships between land use and water quality, most previous studies adopted OLS method which is assumed stationarity. However, this approach is difficult to capture the local variation of the relationships. We used 146 sampling data and land cover data of Korean Ministry of Environment to build conventional regressions and GWR models for BOD, TN and TP. Regression model and GWR models of BOD, TN, TP were compared with R2, AICc and Moran's I. The results of comparisons and descriptive statistics of GWR models strongly indicated the presence of Non-Stationarity between water quality and land use.

Development of a Pipe Network Fluid-Flow Modelling Technique for Porous Media based on Statistical Percolation Theory (통계적 확산이론에 기초한 다공질체의 유동관망 유동해석 기법 개발)

  • Shin, Hyu-Soung
    • The Journal of Engineering Geology
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    • v.23 no.4
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    • pp.447-455
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    • 2013
  • A micro-mechanical pipe network model with the shape of a cube was developed to simulate the behavior of fluid flow through a porous medium. The fluid-flow mechanism through the cubic pipe network channels was defined mainly by introducing a well-known percolation theory (Stauffer and Aharony, 1994). A non-uniform flow generally appeared because all of the pipe diameters were allocated individually in a stochastic manner based on a given pore-size distribution curve and porosity. Fluid was supplied to one surface of the pipe network under a certain driving pressure head and allowed to percolate through the pipe networks. A percolation condition defined by capillary pressure with respect to each pipe diameter was applied first to all of the network pipes. That is, depending on pipe diameter, the fluid may or may not penetrate a specific pipe. Once pore pressures had reached equilibrium and steady-state flow had been attained throughout the network system, Darcy's law was used to compute the resultant permeability. This study investigated the sensitivity of network size to permeability calculations in order to find out the optimum network size which would be used for all the network modelling in this study. Mean pore size and pore size distribution curve obtained from field are used to define each of pipe sizes as being representative of actual oil sites. The calculated and measured permeabilities are in good agreement.

Algorithm Development for Effective Material Management in High-Rise Building Constructions (알고리즘 개발 연구방법론 기초연구 - 초고층 공사에서의 물류효율화를 위한 장비간 통신 방법 모델설정을 중심으로)

  • Cho, Chang-Yeon;Kwon, Soon-Wook;You, Seuk-Joon;Lee, Joo-Hyung
    • Proceedings of the Computational Structural Engineering Institute Conference
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    • 2009.04a
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    • pp.230-233
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    • 2009
  • 3D(Difficult, Dirty, Dangerous) 산업의 대표적인 산업으로 인식되는 건설업은 현재 노무기능인력의 고령화와 신규 기능인력 육성의 어려움이라는 문제에 당면하였으며, 이러한 3D 산업이라는 이미지의 탈피 및 노동집약적 사업구조에 대한 변화에 대한 대안으로써 타산업과의 융복합을 통한 이미지 쇄신 및 생산성 향상을 위해 자동화 및 정보화를 위한 노력을 경주하고 있다. 본 연구에서는 건설 자동화 및 정보화를 위한 알고리즘 개발 연구방법론에 대한 기초연구로써, 초고층 공사에서의 물류 효율화를 위한 장비간 통신방법에 대한 모델을 설정하고, 해당 모델에 대해 적용 가능한 알고리즘을 도출하는 프로세스를 규명함으로써, 건설 자동화 및 정보화 연구를 진행하는 단계에서 최적화(Optimization)를 위한 알고리즘 규명에 대한 방안을 제시하고자 한다.

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