• Title/Summary/Keyword: System Configuration Change

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Probabilistic Study on Pressure Behavior in Concrete Vacuum Tube Structures (콘크리트 진공튜브의 압력 변화에 대한 확률적 평가)

  • Park, Joonam
    • Journal of the Korean Society for Railway
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    • v.17 no.3
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    • pp.186-192
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    • 2014
  • In this paper, a reliability analysis is performed where the pressure change inside a concrete tube is probabilistically estimated considering the uncertainties inherent in the material and the system discontinuity. A set of uncertain quantities related to the equivalent system air permeability and the atmospheric pressure, are defined as random variables with specific distribution. The pressure change inside a concrete tube is then probabilistically described using both analytical and simulation approaches. The reliability analysis confirms that the geometric configuration of a concrete tube needs to be changed from the initial configuration obtained from the deterministic analysis.

Performance analysis of the B-NT system using simulstor (시뮬레이터를 이용한 B-NT 시스템 성능분석)

  • 이규호;기장근;노승환;최진규;김재근
    • The Journal of Korean Institute of Communications and Information Sciences
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    • v.23 no.6
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    • pp.1503-1513
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    • 1998
  • This paper is related to a performance analysis of B-NT system, which is essential compositional equipment of B-ISDN access network. A simulator enabling performance analysis according to the change of network configuration topology and the change of user traffic is developed in this study. The developed B-NT, system simulator consists of graphic user interface module, simulation program automatic generator module, and B-NT system model library module. As examples of the results of performance analysis using the simulator, end-to-end user cell transmission delay time, queueing delay time in each system, and cell loss rate in the head node switch are presented. The simulator developed in this paper can be utilized in determining the network topology of B-NT system.

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인터넷 기반 Collaborative Design 시스템 개발

  • 한승헌;차주현;최용제
    • Proceedings of the Korean Society of Precision Engineering Conference
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    • 1995.10a
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    • pp.687-690
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    • 1995
  • The configuration of design technology in 21st century must require collaborative design system, in which distributed design organizations and their related enterprises can mutually cooperate by overcoming time and regional restictions, and by exactily exchanging and sharing desing data. To achieve these objectives, it is necessary that the design system can propery deal with the dynamic change between regionally distributed modules. In this paper, we will discuss developing the dynamic virtual collaborative design system based on WWW by implementing recent web technologies such as Java and VRML.

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A Study on the PWM Controller of DC-AC Inverter using the Multiprocessor System (다중프로세서 방식을 사용한 직류-교류변환기의 펄스폭변조제어에 관한 연구)

  • 이윤종;이성백
    • The Journal of Korean Institute of Communications and Information Sciences
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    • v.12 no.5
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    • pp.505-518
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    • 1987
  • In this paper, the 2-level and 3-level types of PWM technique have been analyzed, and a multiprocessor has been designed as controller for these two types of PWM inverters. Designed multiprocessor employing a hierarchical structure of a SUPERVISORY PROCESSOR which interconnects three LOCAL PROCESSOR through a common memory technique has showed as elaborate digital control characteristic. Using this multiprocessor configuration the system could gain a great degree of freedom in change of software. Also software was simpler than a single processor configuration.

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A Study on Improvement of Aircraft Handling Quality for Asymmetric Loading Configuration from Flight Test (비행시험을 통한 비대칭 무장 형상의 조종성 개선에 관한 연구)

  • Kim Chong-Sup;Hwang Byung-Moon;Kim Seung-Jun
    • Journal of Institute of Control, Robotics and Systems
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    • v.12 no.7
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    • pp.713-718
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    • 2006
  • Supersonic jet fighter aircraft have several different weapon loading configuration to support air-to-air combat and air-to-ground delivery of weapon modes. Especially, asymmetric loading configurations could result in decreased handling qualities for the pilot maneuvering of the aircraft. The design of the T-50 lateral-directional roll axis control laws change from beta-betadot feedback structure to simple roll rate feedback structure and gains such as F-16 in order to improve roll-off phenomena during pitch maneuver in asymmetric loading configuration. Consequently, it is found that the improved control law decreases the roll-off phenomenon in lateral axes during pitch maneuver, but initial roll response is very fast and wing pitching moment is increased. In this paper, we propose the lateral control law blending between beta-betadot and simple roll rate feedback system in order to decreases the roll-off phenomenon in lateral axes during pitch maneuver without degrading of roll performance.

Nonlinear dynamics of an adaptive energy harvester with magnetic interactions and magnetostrictive transduction

  • Pedro V. Savi;Marcelo A. Savi
    • Smart Structures and Systems
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    • v.33 no.4
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    • pp.281-290
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    • 2024
  • This work investigates the mechanical energy harvesting from smart and adaptive devices using magnetic interactions. The energy harvester is built from an elastic beam connected to an electric circuit by a magnetostrictive material that promotes energy transduction. Besides, magnetic interactions define the system stability characterizing multistable configurations. The adaptiveness is provided by magnets that can change their position with respect to the beam, changing the system configuration. A mathematical model is proposed considering a novel model to describe magnetic interactions based on the single-point magnet dipole method, but employing multiple points to represent the magnetic dipole, which is more effective to match experimental data. The adaptive behavior allows one to alter the system stability and therefore, its dynamical response. A nonlinear dynamics analysis is performed showing the possibilities to enhance energy harvesting capacity from the magnet position change. The strategy is to perform a system dynamical characterization and afterward, alter the energetic barrier according to the environmental energy sources. Results show interesting conditions where energy harvesting capacity is dramatically increased by changing the system characteristics.

Requirement Analysis and Drag Prediction for the Aerodynamic Configuration of a Bearingless Rotor Hub (무베어링 로터 허브 형상에 대한 요구도 분석 및 항력 예측)

  • Kang, Hee-Jung
    • Aerospace Engineering and Technology
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    • v.11 no.1
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    • pp.19-26
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    • 2012
  • The requirement for the aerodynamic hub drag, allocated from the system requirement of development of a bearingless rotor hub, was analyzed and embodied to be substantiated by the methodology assigned from the requirement. Drag prediction for the initial hub configuration was carried out by hand calculation using aerodynamic drag coefficients and the design change about the sectional shape of torque tube was suggested to satisfy the requirement. Finally, drag prediction was performed for the changed hub configuration by using unstructured overset mesh technique and parallel computation and the calculated result satisfied the requirement of the aerodynamic hub drag. It was found that the drag of final hub configuration was also within the range of drag inferred from the trendline of developed helicopter.

Development of Optimal Control of Heliostat System Using Configuration Factor and Solar Tracking Device (형상계수와 태양추적장치를 이용한 헬리오스타트 제어 시스템 개발)

  • Lee, Dong Il;Jeon, Woo Jin;Baek, Seung Wook
    • Transactions of the Korean Society of Mechanical Engineers B
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    • v.36 no.12
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    • pp.1177-1183
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    • 2012
  • This study aims to develop a system that maximizes the radiative heat transfer from the heliostat to the receiver by using the configuration factor and a solar tracking device. As the heat transfer from the heliostat to the receiver is delivered by solar radiation, the configuration factor commonly utilized for radiation is applied to control the heliostat. Tracking the sun and calculating its position are possible by using an illuminance sensor (CdS) and Simulink. By applying optimized algorithms programmed using Simulink that maximize the configuration factors among the heliostat, receiver, and sun in real time, the solar absorption efficiency of the receiver can be maximized. Simulations were performed on how to change the angle required to control the elevation and azimuthal angle of the heliostat during the daytime with respect to various distances.

The Comparison of Reliability for Change Single Loop Configuration in Radial Power Distribution System (수지상 배전계통을 단일루프로 구조 변경시 신뢰도 비교)

  • Lee, Hee-Tae;Kim, Jae-Chul;Kim, Ju-Yong
    • The Transactions of The Korean Institute of Electrical Engineers
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    • v.58 no.8
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    • pp.1472-1478
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    • 2009
  • The domestic power distribution system is operating in an open loop mode; however, it already has a loop structure. Power distribution systems must be changed for bi-directions power supply for smart networks due to a changing of paradigm in electric power industry. The simplest bi-directions distribution networks can make it closing of normally open switch. However, bi-directions power supply is very difficulty to be operated and there are many parts which it must study. This paper presented various models that are able to change a radial system for loop structures. Further, we compared the reliability index for each model by evaluating the amount of improvement reliability required in radial power distribution system. In addition, we calculated CIC(Customer Interruption Cost) for each model by comparing and analyzing.

Developement of Web-Based Circuit-Constructible remote Laboratory (회로구성이 가능한 인터넷 기반의 원격 실험실 구축에 관한 연구)

  • Joung, Soung-Hun;Kim, Ho-Seong
    • Proceedings of the KIEE Conference
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    • 2001.07d
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    • pp.2603-2605
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    • 2001
  • In this paper, we introduce the concept and construction of a web-based bidirectional remote laboratory system. In this configuration, students build and test circuits using internet at home, and the circuit components and experimental equipments at the school are interconnected following student's design. This means that it is possible to choose components, build circuits, connect experiment equipments, control the equipment. and receive measurement results at home in real-time. Labview and Java are used to control this system efficiently and to provide user-friendly environments. Computer-based function generator, DMM, and oscilloscope are used and switch module is used to change interconnections. It was found that a system adopting computer-based instruments, which include PXI/CompactPCI modules and PC plug-in board, provide better performance than that adopting stand-alone instruments connected with GPIB. It is believed that, if this system is installed, the real experiments, not the virtual experiments based on simulation, can be done at home effectively, resulting in revolutional change in engineering education.

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