• 한국산업정보학회논문지
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• 제10권4호
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• pp.90-96
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• 2005

본 논문에서는 학교, 병원, 관공서와 같은 공공기관에서 사용할 수 있는 멀티 캐스팅 방송 시스템을 개발하였다. 개발된 멀티 캐스팅 방송 시스템은 다양한 멀티미디어 교육매체를 활용할 수 있도록 하였으며, 네트워크를 이용한 원격 제어가 가능하도록 고려하였다. 또한 개발된 방송 시스템은 선택적 개별 방송과 그룹 방송이 가능한 스피커 제어 모듈과 다양한 교육매체의 효율적인 활용을 위한 AV 콘텐츠 제어 모듈 및 조명 제어 모듈을 포함하고 있다. 그리고 통신과정에서는 외란에 강인한 RS-485C 통신을 이용하였으며, 사용자 중심의 GUI 기반 통합 제어 시스템을 개발하여 운영의 효율성 향상을 모색하였다.

• Journal of Power Electronics
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• 제9권3호
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• pp.410-417
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• 2009

This paper represents a design and implementation of a digital controller for a multi-phase synchronous buck converter (SBC) using a digital signal processor (DSP). The multi-phase SBC has generally been used for a voltage regulation module (VRM) of a microprocessor because of its high current handling capability at a low output voltage. The VRM requires high control performance of tight output regulation, high slew rate, and load sharing capability of multiple converters. In order to achieve these requirements, the design and implementation of a digital control system for a multi-phase SBC are presented in this paper. The digital PWM generation, current sensing, and voltage and current controller using a DSP TMS320F2812 are considered. The experimental results are provided to show the validity of the implemented digital control system.

• 한국지열·수열에너지학회논문집
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• 제9권2호
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• pp.16-24
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• 2013

A multi-heat pump provides the benefits of comfort, energy conservation and easy maintenance. Recently, the multi-heat pump has been widely employed in small and medium-sized buildings. However, the control algorithm of the multi-heat pump are limited in the open literature due to complicated operating conditions. In this study, the MIMO control algorithm using integral optimum regulator was designed and the control performance of it was analyzed. In addition, system model of the control plant was developed by PRBS system identification scheme. The MIMO controller adopting the integral optimum regulator yielded satisfactory control performance results.

• 한국전자통신학회논문지
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• 제9권3호
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• pp.351-358
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• 2014

본 연구에서는 크레이터의 전류, 전압, 가스 제어, 와이어 피더 구동, 정전압 출력 제어, 고주파 제어, 정전류 제어, 및 아크 용접 제어 등을 스마트 폰을 이용하여 다기능 용접기를 쉽게 제어할 수 있는 시스템을 제안하였다. 제안 시스템을 사용하는 경우 90% 정도가 다기능 용접기를 이용하는데 용이하다는 결과를 얻었다. 10%는 있으면 좋겠지만 필요 없다는 대답과 "용이하다"라고 응답한 대상자 90%중 30% 정도는 용접기를 사용하면서 사용 연령층에 따라서 스마트 폰 활용이 "매우 어렵다"라고 응답한 경우도 조사되었다. 그러나 스마튼 폰 이용은 점진적으로 사용자의 연령층이 낮아질수록 효과적임을 알 수 있다.

• Smart Structures and Systems
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• 제23권6호
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• pp.579-587
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• 2019

In this paper, pounding tuned mass dampers (PTMDs) were designed to mitigate the multi-mode vortex-induced vibration (VIV) of stay cable utilizing the viscous-elastic material's energy-dissipated ability. The PTMD device consists of a cantilever metal rod beam, a metal mass block and a specially designed damping element covered with viscous-elastic material layer. Wind-tunnel experiment on VIV of stay cable model was set up to validate the effectiveness of the PTMD on multi-mode VIV mitigation of stay cable. By analyzing and comparing testing results of all testing cases, it could be verified that the PTMD with viscous-elastic pounding boundary can obviously mitigate the VIV amplitude of the stay cable. Moreover, the installed location and the design parameters of the PTMD device based on the controlled modes of the primary stay cable, would have a certain extent suppression on the other modal vibration of the stay cable, which means that the designed PTMDs are effective among a large band of frequency for the multi-mode VIV control of the stay cable.

• 제어로봇시스템학회:학술대회논문집
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• 제어로봇시스템학회 1991년도 한국자동제어학술회의논문집(국제학술편); KOEX, Seoul; 22-24 Oct. 1991
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• pp.1915-1919
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• 1991

The efficiency of automated assembly line is increased by realizing the automation of each assembly cell, monitoring the line information and developing the real-time line control system it. which production flow is controllable. In this paper, the several modules which are important factors when constructing automated real-time control system, such as, line control S/W module, real-time model change module, error handling module and line production management S/W module, are developed. For developing these important programming modules, real-time control and multi-tasking techniques are integrated. In this paper, operating method of real-time line control in PCB automated assembly line is proposed and for effective control of production line by using multi-tasking technique, proper operating method for relating real-time line control with multi-tasking is proposed by defining the levels of signals and tasks. CIM-Oriented modular programming method considering expandability and flexibility will be added for further research in the future.

• 한국정밀공학회:학술대회논문집
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• 한국정밀공학회 2005년도 춘계학술대회 논문집
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• pp.250-253
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• 2005

A Programmable Automation Controller (PAC) has been developed by Turbotek Co., Ltd. The developed system has multi-domain functionality-including sequence control, motion control and HMI- on a single platform. The PAC also has a common development platform for the design and integration of multi-domain automated systems. Since hardware of the developed system has modular architectures, performance and specification of the controller are determined by combination of specific modules. The developed system employs de facto standards such as OPC interface that allow users to easily exchange data as part of networked multi-vendor systems.

• 전력전자학회:학술대회논문집
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• 전력전자학회 2000년도 전력전자학술대회 논문집
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• pp.464-467
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• 2000

In this paper we introduce the network based multi-motors control system using CAN(Controller Area Network) The traditional multi-motors control system has many problems in the view of reliability and economy because of the amount and complexity of wiring noise and maintenance problems etc, These problems are serious especially when the motor controllers are separated widely CAN is generally applied in car networking in order to reduce the complexity of the related wiring harnesses. These traditional CAN application techniques are modified to achieve the real time communication for the multi-motor control system. And also the position synchronization technique is developed and the proposed methods are verified experimentally.

• 한국추진공학회:학술대회논문집
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• 한국추진공학회 2010년도 제34회 춘계학술대회논문집
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• pp.288-291
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• 2010

다발 노즐을 사용한 원통형 비행체의 추력 방향 제어에 대해 수치적으로 연구하였다. 밸브의 개폐를 이용하여 노즐 유량을 조절하고 다수의 경사 노즐을 배열하여 추력을 조정하는 시스템을 고려한 3차원 유동 해석을 수행하여 경사 노즐의 작동 특성을 관찰하였으며, 질량 유량에 따른 다발 노즐의 분력의 크기, 추력 및 모멘트 크기를 제시하였다.

• Journal of Communications and Networks
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• 제18권1호
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• pp.75-83
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• 2016

In this paper, we propose a multi-channel medium access control (MAC) protocol, named underwater multi-channel MAC protocol (UMMAC), for underwater acoustic networks (UANs). UMMAC is a split phase and reservation based multi-channel MAC protocol which enables hosts to utilize multiple channels via a channel allocation and power control algorithm (CAPC). In UMMAC, channel information of neighboring nodes is gathered via exchange of control packets. With such information, UMMAC allows for as many parallel transmissions as possible while avoiding using extra time slot for channel negotiation. By running CAPC algorithm, which aims at maximizing the network's capacity, users can allocate their transmission power and channels in a distributed way. The advantages of the proposed protocol are threefold: 1) Only one transceiver is needed for each node; 2) based on CAPC, hosts are coordinated to negotiate the channels and control power in a distributed way; 3) comparing with existing RTS/CTS MAC protocols, UMMAC do not introduce new overhead for channel negotiation. Simulation results show that UMMAC outperforms Slotted floor acquisition multiple access (FAMA) and multi-channel MAC (MMAC) in terms of network goodput (50% and 17% respectively in a certain scenario). Furthermore, UMMAC can lower the end-to-end delay and achieves a lower energy consumption compared to Slotted FAMA and MMAC.