• Transactions of the Korean Society of Machine Tool Engineers
• /
• v.10 no.4
• /
• pp.70-75
• /
• 2001

In metal cutting, the machining accuracy is more affected by thermal errors than by geometric errors. This paper models of the thermal errors for error analysis and develops on-the-machine measurement system by which the volumetric error are measured and compensated. The thermal error is modeled by means of angularity errors of a column and thermal drift error of the spindel unit which are measured by the touch probe unit with a star type styluses, a designed spherical ball arti-fact, and five gap sensors. In order to analyze the thermal characteristics under several operating conditions, experiments performed with the touch probe unit and five gap sensors on the vertical and horizontal machining centers.

• Proceedings of the Korean Society of Machine Tool Engineers Conference
• /
• 2001.04a
• /
• pp.453-457
• /
• 2001

One of the major limitations of productivity and quality in metal cutting is the machining accuracy of machine tools. The machining accuracy is affected by geometric and thermal errors of the machine tools. In this study, the compensation device is manufactured in order to compensate thermal error of machine tools under the real-time. This paper models of the thermal errors for error analysis and develops on-the-machine measurement system by which the volumetric error are measured and compensated. The thermal error is modeled by means of angularity errors of a column and thermal drift error of the spindle unit which are measured by the touch probe unit with a star type styluses, a designed spherical ball artifact, and five gap sensors. In order to compensate thermal characteristics under several operating conditions, experiments performed with five gap sensors and manufactured compensation device on the horizontal machining center.

• Transactions of the Korean Society of Mechanical Engineers
• /
• v.17 no.7 s.94
• /
• pp.1813-1822
• /
• 1993

An algorithm of fuzzy variable structrue control is proposed to design a closed loop fuel-injection system for the emission control of automotive gasoline engines. Fuzzy control is combined with sliding control at the switching boundary layer to improve the chattering of the stoichiometric air to fuel ratio. Multi-staged fuzzy rules are introduced to improve the adaptiveness of control system for the various operating conditions of engines, and a simplified technique of fuzzy inference is also adopted to improve the computational efficiency based on nonfuzzy micro-processors. The proposed method provides an effective way of engine controller design due to its hybrid structure satisfying the requirements of robustness and stability. The great potential of the fuzzy variable structure control is shown through a hardware-testing with an Intel 80C186 processor for controller and a typical engine-only model on an AD-100 computer.

• Proceedings of the Korean Society of Machine Tool Engineers Conference
• /
• 2000.10a
• /
• pp.449-453
• /
• 2000

In metal cutting, the machining accuracy is more affected by thermal errors than by geometric errors. This paper models of the thermal errors for error analysis and develops on-the-machine measurement system by which the volumetric error are measured and compensated. The thermal error is modeled by means of angularity errors of a column and thermal drift error of the spindle unit which are measured by the touch probe unit with a star type styluses, a designed spherical ball artifact, and five gap sensors. In order to analyze the thermal characteristics under several operating conditions, experiments performed with the touch probe unit and five gap sensors on the vertical and horizontal machining centers.

• Journal of the Korean Institute of Illuminating and Electrical Installation Engineers
• /
• v.22 no.1
• /
• pp.50-57
• /
• 2008

To change rail tracks from main track to another track, it needs a device that is called the turnout point. If the point which is composed of accurate parts and complex sensors does not work, And also, serious problems will be arisen. However, there are serious problems by the failure of the point. In this paper, after analyzing the failures of the conventional points, a new point is suggested. The proposed point is not affected by the surge caused by lightning.

• Journal of the Korean Society for Precision Engineering
• /
• v.11 no.2
• /
• pp.75-84
• /
• 1994

기계가공프로세스에서 절삭공구의 마멸과 채터진동은 공작기계의 가동율과 생산성을 크게 저해하는 요인이 되고 있다. 본 연구에서는 공구마멸과 채터현상이 혼재하는 상황에서, 이들 두 현상을 동시에 검출하는데, AE 및 가속도센서에서 검출된 신호와 AR계수 및 주파수대역 평균에너지를 특징입력으로 하는 인공신경회로망을 이용하였다. 그 결과, 공구마멸과 채터현상에 대응하는 서로 다른 신호특징의 차이를 동시에 식별하는 데 인공신경 회로망의 유용성을 입증하였으며, 시계열모델의 AR계수(70 .approx. 90%)보다는 주파수대역에너지법의 평균에너지 (80 .approx. 100%)를 신경회로망의 특징입력으로 하는 경우가 높은 성공률을 나타내었다.

• Proceedings of the Korea Information Processing Society Conference
• /
• 2015.10a
• /
• pp.27-29
• /
• 2015

현재 사용되고 있는 화재 통제 시스템은 화재 발생 시 단순한 열감지 센서를 통해 화재를 감지하고 연결된 경종에 신호를 보내 소리를 내어 알리는 방식을 사용하고 있다. 이러한 기계식 시스템은 잦은 고장과 낮은 정확도로 인한 신뢰도 문제뿐만 아니라 화재 발생 시 대피대상자들을 적절하게 유도하지 못하여 막대한 2차 피해가 발생하는 문제를 안고 있다. 본 논문에서는 IT 기술을 바탕으로 효율적이고 체계적으로 화제 통제를 지원하는 통합 시스템을 구현하였다. 이 시스템은 화재 통제의 핵심인 감지, 알림, 유도 기능의 효과를 극대화하도록 상호 연결되고 통합되어 있다.

• Proceedings of the Korea Information Processing Society Conference
• /
• 2022.11a
• /
• pp.946-948
• /
• 2022

주차 공간의 부족으로 인해 생기는 문제점들을 해결하기 위해 기존 기계식 주차타워가 아닌 새로운 주차 방식으로 자동 주차 로봇을 만들어보고자 한다. A^* 알고리즘과 QR코드, 각종 센서들을 통해 인공지능 프로그램을 구현하고, 회전반경을 줄여 공간의 효율성을 극대화할 수 있는 메카넘휠을 사용해 모바일 주차로봇을 만들어본다.

• Proceedings of the KSME Conference
• /
• 2001.06b
• /
• pp.228-234
• /
• 2001

NTMS(Non-contact Tilted-angle Measuring System) is developed by using the principle that the magnetic field of an anisotropic magnet's inner space is uniform and it's possible to measure the strength of the magnetic field using a linear hall effect sensor. In order to implement the caliper system of the geometry PIG(Pipeline Inspection Gauge) which has high accuracy and proper output voltage of the hall sensor without additional driving module or a signal amplifier, it is necessary to consider the size of the magnet, the inner space and back-yoke and the position of pin-hole in the magnet. So the optimal design method of the caliper system is proposed through analysis of NTMS's magnetic field adopting a FEM(Finite Element Method). The experimental results show that the developed caliper system can be used for the geometry pig with good performances.

• Journal of Adhesion and Interface
• /
• v.18 no.1
• /
• pp.1-7
• /
• 2017

This study is about basic sensor experiment using PDPS by common pencil. 20 mm length, 3 mm thickness of line using 4B pencil is optimum condition. In order to be stable at point of contact between pencil line and copper wire, silver paste is needed. At using the PDPS, thermal detecting is able and thermal properties is inversely proportional to electrical resistance in the based on empirical formula. The sensor can be also used in the composites mold via the empirical formula by the relationship between thermal impact and electrical resistance. The change of electrical resistance relates the interfacial property of composites. It leads to expectation of properties.