• Title/Summary/Keyword: structure system

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Research on Change of Tensile Strength with Joint Distance and Form in the Roof Composite Waterproofing Method for Synthetic Polymer Waterproofing Sheet (합성고분자계 방수시트를 이용한 옥상 복합방수공법의 접합부 이격거리 및 형태별 인장성능 변화에 관한 연구)

  • Go, Gun-Woong;Heo, Neung-Hoe;Kim, Yun-Ho;Park, Jin-Sang;Song, Je Young;Oh, Sang-Keun
    • Proceedings of the Korean Institute of Building Construction Conference
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    • 2012.05a
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    • pp.65-67
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    • 2012
  • The butt-joint system is widely used as the method of roof composite waterproofing system. However, there is stilll no objective research about proper distance, and proper structure associated with the performance in butt-joint system. In this research, we find proper distance and proper structure in butt-joint system through tensile strength test at joint, and comparative analyze with practical construction material of composite waterproofing sheet.

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Security Structure for Protection of Emergency Medical Information System (응급의료정보시스템의 보호를 위한 보안 구조)

  • Shin, Sang Yeol;Yang, Hwan Seok
    • Journal of Korea Society of Digital Industry and Information Management
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    • v.8 no.2
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    • pp.59-65
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    • 2012
  • Emergency medical information center performs role of medical direction about disease consult and pre-hospital emergency handling scheme work to people. Emergency medical information system plays a major role to be decreased mortality and disability of emergency patient by providing information of medical institution especially when emergency patient has appeared. But, various attacks as a hacking have been happened in Emergency medical information system recently. In this paper, we proposed security structure which can protect the system securely by detecting attacks from outside effectively. Intrusion detection was performed using rule based detection technique according to protocol for every packet to detect attack and intrusion was reported to control center if intrusion was detected also. Intrusion detection was performed again using decision tree for packet which intrusion detection was not done. We experimented effectiveness using attacks as TCP-SYN, UDP flooding and ICMP flooding for proposed security structure in this paper.

Development of a Pipe Modeling System based on the Hull Structural Model Applying the Rapid Pipe Routing Method (쾌속 배관 라우팅 방법을 적용한 선체 구조 모델 기반의 배관 모델링 시스템 개발)

  • Roh, Myung-Il;Choi, Woo-Young;Lee, Kyu-Yeul
    • Korean Journal of Computational Design and Engineering
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    • v.12 no.5
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    • pp.321-329
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    • 2007
  • The present pipe modeling method requires detailed inputs from a designer to generate a pipe model, and thus it takes much time for the designer to perform such task. Moreover, the pipe model has no relation with the hull structure. Thus, it is time-consuming and requires much effort if design changes arise. In this study, a generating method that generates quickly many pipes using a pipe tray and a conversion method that converts automatically the pipes into objects related with the hull structure are proposed. A pipe modeling system based on the proposed methods is developed. The applicability of the developed system is demonstrated by applying it to the generation of the pipe model of a deadweight 300,000 ton VLCC(Very Large Crude oil Carrier). The results show that the developed system can quickly generate the pipe model in relation with the hull structure.

A Static Output Feedback Integral Variable Structure Controller for Uncertain Systems with Unmatched System Matrix Uncertainty (부정합 시스템 행렬 불확실성을 갖는 시스템을 위한 정적 출력 궤환 적분 가변 구조 제어기)

  • Lee, Jung-Hoon
    • The Transactions of The Korean Institute of Electrical Engineers
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    • v.59 no.2
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    • pp.411-416
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    • 2010
  • In this paper, an integral variable structure static output feedback controller with an integral-augmented sliding surface is designed for the improved robust control of a uncertain system under unmatched system uncertainty and matched input matrix uncertainty and disturbance satisfying some conditions. To effectively remove the reaching phase problems, an output dependent integral augmented sliding surface is proposed. Its equivalent control and ideal sliding mode dynamics are obtained. The previous some limitations is overcome in this systematic design. A stabilizing control with the closed loop exponential stability is designed for all unmatched system matrix uncertainties and proved together with the existence condition of the sliding mode on S=0. To show the usefulness of the algorithm, a design example and computer simulations are presented.

Study on the Fiber Bragg Grating Sensors for Smart Structures and Their Applications (스마트 구조물용 광섬유 격자센서 및 그 응용)

  • Kim Ki-Soo;Song Young-Chul;Pang Gi-Sung
    • Proceedings of the Korean Society For Composite Materials Conference
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    • 2004.04a
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    • pp.115-118
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    • 2004
  • In this paper, a Fiber Bragg Grating (FBG) sensor system for smart structures is described. FBGs are well-suited for long term and extremely severe experiments, where traditional strain gauges fail. In the system, a reflect wave-length measurement method which employs a tunable light source to find out the center wave-length of FBG sensor is used. We applied the FBG system to composite repairing structures and beam column joint of building structure. We also applied the system to nuclear energy power plant for structural integrity test to measure the displacement of the structure under designed pressure and to check the elasticity of the structure by measuring the residual strain. The system works very well and it is expected that it can be used for a real-time strain, temperature and vibration detectors as parts of smart structures.

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Design of Digital Position Controller for DC Motors Using Variable Structure Control System (가변구조 제어계통에 의한 직류 전동기의 위치제어기 설계)

  • 박귀태;송명현;강대린
    • The Transactions of the Korean Institute of Electrical Engineers
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    • v.38 no.3
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    • pp.228-236
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    • 1989
  • The theroy of variable structure control system (VSS) is applied to the position control for DC servo-motors. In order to use the microcomputer as a control device, the principles of VSS for the continuous-time system are extended to the discrete-time system. A new switching law is proposed to achieve the reduction of chattering. It adds a new switching structure to the conventional switching sturctures. This switching region is set near and including the conventional switching curve. The new algorithm is obtained for single-input second order system, and applied to the position control of a DC servo-motor. Experimental results show that the transient behavior is improved due to the reduction of chattering and good robustness properties are demonstrated.

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Design of an Input-Parallel Output-Parallel Multi-Module DC-DC Converter Using a Ring Communication Structure

  • Hu, Tao;Khan, Muhammad Mansoor;Xu, Kai;Zhou, Lixin;Rana, Ahmad
    • Journal of Power Electronics
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    • v.15 no.4
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    • pp.886-898
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    • 2015
  • The design feasibility of a micro unidirectional DC transmission system based on an input-parallel output-parallel (IPOP) converter is analyzed in this paper. The system consists of two subsystems: an input-parallel output-series (IPOS) subsystem to step up the DC link voltage, and an input-series output-parallel (ISOP) subsystem to step down the output voltage. The two systems are connected through a transmission line. The challenge of the delay caused by the communication in the control system is addressed by introducing a ring communication structure, and its influence on the control system is analyzed to ensure the feasibility and required performance of the converter system under practical circumstances. Simulation and experiment results are presented to verify the effectiveness of the proposed design.

Athermalization of an Optical System Based on Lens Shape and Assembly Method

  • Xu, Sihua;Peng, Xiaoqiang;Tie, Guipeng;Guan, Chaoliang;Hu, Hao;Xiong, Yupeng
    • Current Optics and Photonics
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    • v.3 no.5
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    • pp.429-437
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    • 2019
  • Temperature adaptability is an important metric for evaluating the performance of an optical system. The temperature characteristics of the optical system are closely related to the material and shape of its lens. In this paper, we establish a mathematical model relating the temperature characteristics to the shape and material of the lens. Then a novel assembly structure that can solve the lens constraint and positioning problem is proposed. From those basics, the correctness of the theoretical model and the effectiveness of the assembly structure are verified through simulated analysis of the imaging quality of the optical system, whose operating temperature range is $-60{\sim}100^{\circ}C$.

An Evaluation of Pneumatic Conveyor Equipment Stability Through Fluid Structure Interface Analysis (FSI 해석을 통한 공기압 컨베이어 장치의 안전성 평가)

  • Kim, Chan-Woo;Yoo, Ji-In;Roh, Hyun-Woo;Choi, Sung-Dae;Hur, Jang-Wook
    • Journal of the Korean Society of Manufacturing Process Engineers
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    • v.18 no.9
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    • pp.94-99
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    • 2019
  • To evaluate the stability of a pneumatic conveyor system, a flow analysis and structural analysis were performed using the FSI technique. Prototypes were fabricated and verified. As a result of the flow analysis, the maximum pressure applied to the device was calculated to be 0.55 MPa. The structural analysis determined that the maximum stress was 131 MPa and the yield strength of the structure was less than 205 MPa. The safety of the system was confirmed by the fact that no deformation occurred during the manufacturing and operation of the prototype.

A Study on the Application of Gypsum Board through the Application of Fire Resistance Ceiling Structure (내화천장구조 적용을 통한 석고보드 활용 확대에 관한 연구)

  • Choi, Dong-ho
    • Proceedings of the Korean Institute of Building Construction Conference
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    • 2019.11a
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    • pp.217-218
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    • 2019
  • Fire resistance ceiling system is the structure of which the ceiling installed under the slave of the structure has the fire resistance performance. Because of having the fire resistance performance, fire resistive coatings on steel beams can be reduced and large span structures can be constructed. So, it have advantages of convenience for construction, shorten for construction time and cost reducing. In foreign country, it is general that one system consisting of slave and ceiling is constructed as a fire resistance system, in these cases, gypsum boards are mostly used as ceiling materials. The purpose of this study was to explain the possibility of expanding the use of gypsum boards by securing fire resistance performance of these ceilings.

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