• 대한기계학회논문집A
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• 제32권8호
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• pp.701-706
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• 2008

A continuous 3D tube bending machine has been developed for industrial boiler panel production. The machine consists of a main bender, a sub bender, a side bender, tube feeding rollers and control system that includes data management system. Tube position is controlled by a numerical control system. The bending former can be easily replaced according to the shape of bending form. Reduction of working time and improvement of production capacity from the practice have been achieved by bending a long tube in the machine developed.

• 제어로봇시스템학회논문지
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• 제3권3호
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• pp.289-296
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• 1997

In this paper, a method has been proposed for error measurement/diagnosis of CNC machine tools using the ball link bar on three dimensional space. For the circular motion error measurement, deviation between the desired and actual test path has been measured and analysed using a new type of ball link which incorporates ideal three point contact between reference balls and sockets. Computer program for the error evaluation has been developed and implemented under PC environment. Using the developed program, the circular test data on a CNC machine tool have been analysed, and thus, machine tool errors were effectively evaluated.

• 한국전자통신학회논문지
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• 제9권2호
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• pp.181-186
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• 2014

본 논문에서는 셀룰러 기반의 사물 간 통신 네트워크에서의 임의접근채널 과부하 문제를 해결하기 위한 부하제어 기법을 제안한다. 사물 간 통신 단말은 기존 이동통신 단말에 비해 매우 높은 밀도로 분포하며 주로 간헐적으로 짧은 데이터를 전송하는 특성을 가지고 있다. 이러한 특성으로 인해 임의접근 기반으로 기지국에 접속하게 되는데 이 때 다수의 사물 간 통신 단말이 기지국 임의접근 채널에 신호를 전송하는 경우 임의접근 채널에 과부하가 일어날 수 있다. 그러므로 본 논문에서는 이러한 문제를 해결하기 위해 기지국이 네트워크의 부하를 측정하고 이를 바탕으로 p-persistent 방식을 이용해 부하를 제어하는 기법을 제안한다.

• 한국원자력학회:학술대회논문집
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• 한국원자력학회 1998년도 춘계학술발표회논문집(1)
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• pp.291-296
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• 1998

The DAta management and Communication NETworks (DACONET), Which it is designed as a subsystem for Man-Machine Interface System of Korea Advanced LIquid MEtal Reactor(KALIMER MMIS) and advanced design concept is approached, is described. The DACONET has its roles of providing the real-time data transmission and communication paths between MMIS systems, providing the quality data for protection, monitoring and control of KALIMER and logging the static and dynamic behavioral data during KALIMER operation. The DACONET is characterised as the distributed real-time system architecture with high performance, Future direction, in which advanced technology is being continually applied to Man-Machine interface System Development of Nuclear Power Plants, will be considered for designing data management and communication networks of KALIMER MMIS

• 대한기계학회논문집
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• 제12권2호
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• pp.200-205
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• 1988

본 연구는 와이어 컷 방전가공을 위한 자동프로그래밍 시스템 오토 컷 (AUTO-CUT)의 개발에 관한 것으로 저자가 수행했던 연구를 확장한 것이다.

• 제어로봇시스템학회논문지
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• 제5권1호
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• pp.115-121
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• 1999

Advanced digital computer technology enables the computer-based controllers to replace the traditional analog controllers used in factory automations. This replacement, however, brings up the side effects caused by the quantization error and non-real-time execution of control software. This paper describes the structure of real-time simulator and controller that can be used for design and verification of real-time digital controllers. The virtual machine concept adopted by the proposed real-time simulator makes the proposed simulator be independent from the specific hardware platforms. The proposed system can also be used in the loosely coupled distributed environments connected through local area network using real-time message passing algorithm and virtual data table based on the shared memory mechanism.

• 대한건축학회논문집:구조계
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• 제35권2호
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• pp.45-52
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• 2019

BEMS(Building Energy Management Systems) have been applied to office buildings and collect relevant building energy data, e.g. temperatures, mass flow rates and energy consumptions of building mechanical systems and indoor spaces. The aforementioned measured data can be beneficially utilized for developing data-driven machine learning models which can be then used as part of MPC(Model Predictive Control) and/or optimal control strategies. In this study, the authors developed ANN(Artificial Neural Network) models of an AHU (Air Handling Unit) and a chiller for a real-life office building using BEMS data. Based on the ANN models, the authors developed optimal control strategies, e.g. daily operation schedule with regard to optimal start and stop of the AHU and the chiller (500 RT). It was found that due to the optimal start and stop of the AHU and the chiller, 4.5% and 16.4% of operation hours of the AHU and the chiller could be saved, compared to an existing operation.

• 대한조선학회 특별논문집
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• 대한조선학회 2011년도 특별논문집
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• pp.101-105
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• 2011

In most shipbuilding company, cutting procedure is proceed by cutting machine which run by CNC(Computer Numerical Code) data. In our cutting process, all CNC data is created by our nesting post processor system automatically. Among them, in case that cutting piece in the remnant plate, our system creates only one piece CNC data. Because remnant plate is not typical shape, and ship designers don't know remnant plate shape and quantity. In can happen some merit and good point if we modify 1:1 piece NC data by shorten cutting path, reducing cutting time or re-arrangement piece. For modifying cutting data, outside workers have to call to ship designer or have to go to NC control room where control the CNC system and cutting machine. It makes stop work process, and it waste time. In this paper, we introduce a program that can modify and replace 1:1 NC data with continuous or common NC data automatically.

• 한국정밀공학회지
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• 제30권12호
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• pp.1313-1320
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• 2013

An ultraprecision multi-axis machine tool has been designed and developed in our laboratory. The machine tool has four moving axes which are composed of three linear axes and one rotational axis. It has a gantry type structure and the Z-axis is on the X-axis and the C-axis, on which a workpiece is located, is inside the Y-axis. This paper shows control performance improving method and procedure for the ultra-precision positioning control of a hydrostatic bearing guided linear axis. Through improvements of electrical and mechanical components for the control system such as control electronics and oil pumping systems, the control disturbing noise is decreased. Also by the frequency domain analysis of control system those problem-making system components are identified and modified with analytical methods. The controller is analyzed and designed from frequency domain data and system information. In the experimental control results the nanometer order control result is successfully presented.

• 한국통신학회논문지
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• 제37B권12호
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• pp.1113-1118
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• 2012

에너지 소비의 효율화를 위한 그린 기술로서 스마트 그리드와 지능형 교통 시스템 등이 주목받고 있다. 이러한 기술의 구현에는 다수의 센서, 액츄에이터 (actuator), 그리고 컨트롤러들이 필요하다. 이러한 구성요소들 간의 machine-to-machine (M2M)통신의 중요성은 높아지고 있다. M2M 통신의 특징은 다수의 machine-type-communication(MTC) 디바이스들이 참여하고, 통신 트래픽 패턴과 QoS 요구조건이 다양하다는 것이다. 이러한 M2M 통신을 효율적으로 지원하기 위한 호 수락 방법들에서는 동일한 시간관련 QoS 조건을 갖는 MTC 디바이스들을 클러스터 단위로 그룹핑하고, QoS 조건 만족여부에 따라 호 수락을 결정하는 방법을 제안하였다. 하지만 이 방법은 데이터 전송주기와 최대 전송지연 시간이 같을 경우에만 적용 가능하다. 본 논문에서는 이러한 제한 없이 사용할 수 있는 방법을 제안한다. 또한 전송 주기와 최대 전송지연 시간이 특별한 관계에 있을 때 최적화할 수 있는 호 수락 제어방법을 제안한다. 제안방법의 QoS 만족 적합성에 대한 증명을 제시하였고, 시뮬레이션을 통해 실제 동작 가능하고, 기존 방법들보다 호 수락 확률에서 우수함을 보였다.