• 디지털산업정보학회논문지
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• 제6권1호
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• pp.13-22
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• 2010

In this paper, we propose a management system for positioning and indicating the surveyed control point using RFID and UMPC. This system is composed of digital control point, management system and application. The digital control point transmits information of the surveyed control point and the management system receives the data from the digital control points and manages the scattered digital control points. The system offers three services for managing the surveyed control point. The first service is control point monitoring service for identifying the change of location, locating the missing control point and the second service is control point search service notifying selected control point to user, and the third service is control point land management service for editing the control point information in the land. Therefore, this system makes it easy for administrators to access the control point information of the scattered surveyed control point through the country and enhances the managing efficiency.

• 지적과 국토정보
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• 제53권2호
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• pp.93-106
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• 2023

본 연구의 목적은 위치기준의 근간이 되는 측량기준점 표지 현황 조사율의 향상 및 신뢰도 제고를 위하여 측량기준점 표지 현황조사 업무 개선방안과 업무 프로세스를 제시하고자 한다. 연구의 내용적 범위로 현행 측량기준점에 해당하는 국가기준점, 공공기준점, 지적기준점의 표지 관리 및 조사·보고체계 현황을 조사하고 문제점을 찾았으며 이를 개선하기 위하여 국가기준점 표지 현황조사 단가산출(안), 측량기준점 표지 현황조사 조사·보고 체계 개선(안), 기준점 이용 측량시행자 사전보고(안)을 마련하였다. 또한 측량기준점 표지 현황조사 프로세스 개선을 위한 업무 프로세스 정립과 측량기준점 표지 현황조사 미보고대상 단가산출을 자동화하는 프로세스를 제시하여 향후 측량기준점 표지 현황조사 업무 효율성이 향상 될 것으로 기대된다.

• 전기학회논문지
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• 제63권4호
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• pp.519-525
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• 2014

In this paper, an alternative variable structure controller is designed for the point-to-point regulation control of uncertain general linear plants so that the output of plants can be controlled from an arbitrarily given initial point to an arbitrarily given reference point in the state space. By using the error between the steady state value of the output and an arbitrarily given reference point and those integral, a transformed integral sliding surface is defined, in advance, as the surface from an initial state to an arbitrarily given reference point without the reaching phase problems. A corresponding control input is suggested to satisfy the existence condition of the sliding mode on the preselected transformed integral sliding surface against matched uncertainties and disturbances. Therefore, the output controlled by the proposed controller is completely robust and identical to that of the preselected transformed integral sliding surface. Through an example, the effectiveness of the suggested controller is verified.

• 대한공간정보학회지
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• 제17권1호
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• pp.97-104
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• 2009

지적도근점과 도시기준점은 설치의 목적과 성격은 다르지만 측량방법, 매설 위치 등이 매우 유사하다. 그렇기 때문에 두 기준점을 연계하여 활용할 수 있다면 도근점 망실에 의한 복구비용의 최소화는 물론 배점밀도의 향상을 가져올 수 있을 것이다. 따라서 본 연구에서는 지적도근점을 기초로 도시기준점의 위치정확도를 분석하여 봄으로써 두 기준점을 연계하여 활용할 수 있는 가능성을 제시하고자 하였다. 연구결과는 다음과 같다. 연구대상지역 총 13점의 도시기준점의 위치정확도를 분석하여 본 결과, 각각의 측점에 대한 연결오차의 RMSE가 최소 ${\pm}8cm$에서 최대 ${\pm}11cm$ 오차를 보이는 것으로 나타났다. 이러한 결과는 현행 지적법에서 규정하고 있는 허용오차 범위내의 성과로 지적도근점과 도시기준점을 연계하여 이용할 수 있는 가능성을 확인할 수 있었다.

• Industrial Engineering and Management Systems
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• 제8권3호
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• pp.139-147
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• 2009

Control charts are used to distinguish between chance and assignable causes in the variability of quality characteristics. When a control chart signals that an assignable cause is present, process engineers must initiate a search for the assignable cause of the process disturbance. Identifying the time of a process change could lead to simplifying the search for the assignable cause and less process down time, as well as help to reduce the probability of incorrectly identifying the assignable cause. The change point estimation by likelihood theory and the built-in change point estimation in a control chart have been discussed until now. In this article, we discuss two kinds of process change point estimation when the CUSUM ($\bar{x}$, s) control chart for monitoring process mean and variance simultaneously is operated. Throughout some numerical experiments about the performance of the change point estimation, the change point estimation techniques in the CUSUM ($\bar{x}$, s) control chart are considered.

• 제어로봇시스템학회:학술대회논문집
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• 제어로봇시스템학회 2000년도 제15차 학술회의논문집
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• pp.259-259
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• 2000

In the recent, the size of hardware is smaller and the structure is simpler, without reducing the performance of the digital controller. Accordingly, the fixed-point arithmetic is very important in the digital controller. This paper presents simulation to apply the robust control algorithms to DVDR servo controller using the floating-point and fixed-point arithmetic from the matlab. Also, it analyses and compares the performance of control algorithms in the each of point calculation and presents a method for improvement of drop in the performance, quantization error and overflow/underflow from using the fixed-point arithmetic

• 한국소음진동공학회논문집
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• 제11권4호
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• pp.22-30
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• 2001

In this paper, active control of vibrational intensity at a reference point in an infinite, elastic plate was discussed. The plate is excised harmonically by a vibrating source, which has a vertical point force. The optimal condition of controller was investigated to minimize the vibrational intensity being transmitted from the vibrating source to a reference point. Hence the method of feedforward control was employed for the control strategy and then the cost function was evaluated to find the optimal control force. Three types of control force (Vertical force, Moment, and Coupling force (a set of vertical force and moment) ) and controller's positions were examined to define the optimal condition of the controller. The vibrational intensity at a reference point was found to be reduced down to a zero level, compared with the uncontrolled case. Especially maximum reduction of vibrational intensity was achieved when the controller was collinearly positioned between a vibrating source and a reference point.

• 전력전자학회:학술대회논문집
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• 전력전자학회 2017년도 추계학술대회
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• pp.95-96
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• 2017

A three-level inverter is widely used thanks to its excellent performances, but the voltage may fluctuate at the neutral point of the split DC-Link. Neutral point voltage fluctuations cause inverter performance degradation and switching element damage, so the neutral point voltage control is essential. However, the neutral point control can be also limited by modulation index and power factor. This paper analyzes the limitation of the neutral point voltage control due to the limitation of zero-sequence voltage, and suggests a method to determine the region where the PWM has to be changed for a better neutral point control.

• Journal of Biosystems Engineering
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• 제17권3호
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• pp.223-228
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• 1992

This study was conducted to develop an electro-hydraulic three-point hitch control system using an electro-hydraulic servo valve and microcomputer and to investigate the performance of the three-point hitch control system through indoor and field experiments. 1. The results from indoor experiments coincided with those from computer simulation reported in the previous paper. However, the draft control with the value 4 of Kd showed a slight sustained oscillation after it reached the draft set. 2. From the field experiments, it appeared that the RMS errors increased with the ground speed of tractor. In position control, the three-point hitch control system with electro-hydraulic servo valve showed better performance than that with on-off electro-magnetic valve in the ground speed less than 1.6 m/s. In draft control, however, there was no significant differece in performance between those two systems. 3. In depth control, the both types of electro-hydraulic three-point hitch control system showed better performance than the conventional mechanical-hydraulic three-point hitch control system.

• 대한공간정보학회지
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• 제19권4호
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• pp.127-138
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• 2011

본 연구에서는 지적기준점과 도시기준점을 연계 활용의 가능성을 제시하고자 창원시를 대상으로 세계측지계 성과로 고시된 창원시 도시기준점(32점)의 GPS 관측데이터를 이용하여 도시기준점에 대한 지적좌표 성과를 산출 분석하여 보았다. 연구결과 3가지 서로 다른 계산 S/W를 이용해 지적좌표를 산출하고 이를 기존 도시기준점 고시 성과와 비교한 결과 현행 법률에서 규정하고 있는 오차의 허용범위 이내로 분석되어 지적측량에 활용 가능성이 있는 것으로 나타났다. 다만 실무에서 안정적인 활용 위해 현행 도시기준점 고시 성과를 직접 지적측량에 이용하기 보다는 새로이 지적성과를 산출해서 활용하는 방안을 제안하였다. 또한 지역 삼각점에 대한 사전 정밀한 성과점검이 필요함을 제시하였다. 끝으로 계산 S/W는 삼변망조정계산 S/W가 적합한 것으로 나타났다.