• Proceedings of the Korea Water Resources Association Conference
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• 2019.05a
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• pp.132-132
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• 2019

첨단 IT기술과 음파와 영상을 이용한 하천 계측 기술의 결합을 통해 하천 수위와 유속을 자동으로 측정하는 기술들이 개발되고 있다. 특히, 표면영상을 이용한 자동유량계측 기술은 카메라 외에 별도로 고가의 장비를 구입할 필요가 없을 뿐 아니라 현장 상황을 영상으로 확인할 수 있기 때문에 현장조사 인력이 필요가 없어 경제적이고, 비접촉식으로 안전하여 각광받고 있는 기법이다. 하지만 표면영상유속계는 기본적으로 원근에 따른 영상왜곡이 발생하기 때문에 이를 정사영상으로 변환하는 과정이 반드시 필요하다. 하지만 대하천과 같이 하폭이 넓은 경우에는 참조점을 이용한 영상왜곡 보정이 어렵다는 한계가 있다. 또한 참조점을 이용한 영상왜곡 변환 방법의 경우 수위변화가 있는 경우 대응이 어렵다는 한계가 있다. 이에 본 연구에서는 참조점을 이용한 영상왜곡 보정 작업이 필요 없는 지표영상유속측정법(IIVM, Index Image Velocimeter)을 개발하였다. 지표영상유속측정법은 기존 표면영상유속계 달리 복잡한 영상좌표변환 과정을 매우 간단하게 처리할 수 있는 장점이 있다. 지표영상유속측정법은 지표영상유속과 카메라와 수표면 사이의 거리를 고려한 지표유속을 사용하고, 이를 통해 기존 표면영상유속계의 한계인 수위변화를 고려하기 어려웠던 점을 극복할 수 있었다. 본 연구에서는 수리실험과 현장영상을 활용하여 수위 변화에 따른 지표유속을 측정한 결과 하천 수위가 변화하는 상황에서도 표면유속을 정확하게 산정할 수 있었고, 실제 측정유속을 대신할 수 있는 지표유속으로도 활용 가능한 것을 확인하였다.

• Journal of the Korean Society of Manufacturing Process Engineers
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• v.20 no.1
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• pp.88-94
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• 2021

Currently, the Busan cooperative fish market follows a traditional market style. This study first investigates the current conditions and environment of the market, and to modernize the market, it proposes a new automatic unloading system based on the benchmark of Namhae Suhyup. In this system, a Korean-type suction fish vacuum pump is employed to increase the loading time. An automatic grader with an adjusting device for inclined angles and a weighing machine with an automatic alignment device are proposed. In addition, a folding machine is employed to prepare boxes. The specifications for each subsystem are provided. By implementing this system, the freshness of fish can be maintained and the sellers can earn more. This system can also be applied to the cooling system of the fish reservoir of littoral sea fishing boats.

• Proceedings of the Korean Institute of Building Construction Conference
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• 2022.11a
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• pp.229-230
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• 2022

According to the national building status, there are a total of 2.89 million buildings that are over 30 years old after completion, and the number is increasing by more than 70,000 to 80,000 buildings every year. As a result, the demand for demolition works is also increasing, and more than 3 to 4 collapse accidents occur steadily every year during demolition work. Major causes of accidents include non-compliance with plans, negligence of on-site supervisors, and failure to secure structural safety. Due to the strengthening of the Severe Disaster Punishment Act, there is growing interest in the demand for secure management of collapse detection during demolition works. Therefore, this study aims to investigate the applicability of real-time safety monitoring systems using a total station capable of 3D automatic displacement measurement in building demolition work for securing structural safety by the load changes during the demolition process.

• Proceedings of the IEEK Conference
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• 2003.07c
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• pp.2541-2544
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• 2003

새로운 원리에 의한 원격 거리 및 각도측정 시스템［1］［2］(이하 TS, Total Station)을 개발하였다. 본 시스템은 마이크로 터널링 공법의 굴진기의 후미 또는 임의의 기준점에 원격으로 점멸할 수 있는 십자형의 발광체를 부착하고, 추진관에 고정시킨 상하좌우 각도측정 및 비접촉식 레이저 거리측정기가 부착된 무인 원격 제어장치에 의하여 십자형 발광체의 중심을 자동으로 검출한다. 또한. 회전각과 CCD 라인 스캔 센서의 조합에 의하여 각도를 정밀하게 원격 측정하게 된다. 한편 본 시스템을 이용하면 마이크로 터널링 공법에 의한 추진관내의 측정 가능한 범위를 연결하는 위치에 복수의 TS를 배치하여 서로의 위치를 자동으로 계측하고 그들 데이터를 컴퓨터에 의하여 계산함으로써, 맨홀의 임의의 기준점으로부터 굴진기의 현재 좌표를 신속하고 정확하게 계산할 수 있다.

• Proceedings of the Korean Society for Bio-Environment Control Conference
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• 1996.10a
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• pp.64-66
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• 1996

수경재배에서 요구되는 최적의 배양액 pH는 5.5-6.5 이고, pH를 최적의 상태로 조절해 주는 방법으로 비료의 흡수생리를 이용하는 방법과 화학적인 산알칼리 용액을 이용하여 조절해 주는 방법이 있다. 이러한 pH 조절은 자동적으로 행해야 효과가 크며 본 실험은 흡수생리적인 면에서 산 혹은 알칼리 비료를 화학적인 산 알칼리와 비교하여 pH 조절효과의 차이를 보고자 하며 생육제어시스템 중 pH의 자동계측 및 제어를 통해서 계속적인 pH의 안정적인 수준을 유지하면서 상품성과 품질이 우수한 작물을 생산하고자 이 실험을 수행하였다. (중략)

• Journal of the Korea Academia-Industrial cooperation Society
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• v.22 no.2
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• pp.766-773
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• 2021

Chemicals, such as ammunition, are disposable items that cannot be reused because of their operational characteristics. The reliability of the test process and test results are important factors in evaluating the performance of guns and ammunition. The pressure after firing is a crucial value in an acceptance test of guns and ammunition performance; hence, accurate measurements are required. The pressure in the artillery is measured using the copper crusher gauge. The compression amount of copper is converted into a pressure by either a length-pressure conversion table or conversion formula. Therefore, the exact measurement of the squeeze of the copper crusher is related directly to the correct estimate of the pressure. Currently, the pressure is measured manually by the operator, which always includes some human error. In this study, the cause of the measurement error was analyzed, and the automatic measuring system for copper crusher deformation was developed to minimize the error elements. A copper crusher could be measured using the probe sensor and CCD camera, and the Jig for stable positioning was also designed. A designated SW was also developed for the system operating and measurement-analysis. This measuring system through this study may be used for an ammunition stockpile reliability test and gun/ammunition acceptance test.

• Korean Journal of Food Science and Technology
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• v.19 no.3
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• pp.200-205
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• 1987

A microcomputer-based on-line monitoring and controlling system was built and applied to the dehycration operation. Drying conditions-drying temperatures and air velocities-were successfully controlled by the control deveices incorporated on/off realy and thyristor, and with the high language program. Drying variables-temperature in drier and weight loss of radish slice were accurately measured and acquisited. The computer-based drying system effectively saved the man power required to measure and record data during the drying period and also made possible to conduct the process undisturbed for long period. The drying rate curves of radish at various drying conditions were obtained from automatic data analyzing program. And also the computer programmed control made possible to investigate the effect of air velocity change during the drying period. The dynamic change of air velocity of from one to another level could be performed and affected markedly the drying rate at first stages of drying, but no significant effect were found in falling rate period.

• The Journal of the Korea Contents Association
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• v.16 no.1
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• pp.362-369
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• 2016

Recently, Last to check the security status of various medium and large bridge structures using various kinds of measurement equipment, but most of the methods are used to measure and check the displacement behavior of the bridge by a certain period. In this study, receive GPS satellite signals that can be observed in real time the whole region, a bridge to automatically measure the displacement and behavior characteristics of the structure in real-time in mm over the 24 hours, the measurement information and transmits the data to the wireless network, by making use, it was applied to the real-time monitoring system in connection with a bridge to be able to automatically notify GNSS fine displacement behavior. In fact, analysis and receives the measurement data to GNSS provided in the upper bridge of the middle and large-sized aging for this purpose, measuring USN and at the same time is converted into a three-dimensional position information of a test study was conducted to monitor the bridge displacement in real time. As a result, a vertical displacement of about 0.027~0.037m at the measurement time of day of the measurement point is that the repeated and confirmed.

• Journal of the Korean Society of Hazard Mitigation
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• v.4 no.3 s.14
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• pp.9-17
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• 2004

In recent years slope failure due to heavy rainfalls or local downpours usually accompanied by typhoons has increasingly occurred in Korea. Also, the damages caused by slope failure have a tendency to be more disastrous than before. This study has been conducted to prepare an early warning system for slope failure by : (1) analyzing types and causes of slope failure, (2) examining the published evaluation criteria for slope stability, (3) estimating slope stability by considering the properties of slope-forming materials as well as the topographical and geological properties of slopes, and (4) determining the most important variables of affecting the stability of the slope under consideration. The data on the variations of slope conditions measured by an automatic in-situ measurement system and then transmitted to the central analysis system by using an internet. The most important variables can be back-calculated in the central system and compared with the values for the first and second management criteria. These management criteria should be modified and corrected continuously in the future by accumulated data and knowledge related to the early warning system for slope failure.

• Journal of the Korean GEO-environmental Society
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• v.11 no.9
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• pp.15-25
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• 2010

The main objective of this study was to offer informations about long-term seepage behavioral characteristics and to find a leakage safety management method for Juam Dam and Imha Dam, a central cored rockfill dams in Korea by the evaluating the automatically monitored leakage data. In the water leakage monitoring of fill dam, the generation of abnormal water leakage is difficult to directly detect due to the effect of outside factors such as the component of rainfall inherent in the observation value. Therefore, conventionally estimation methods of water leakage quantity were applied by multiple regression analysis considering reservoir water level, rainfall, etc.. However, the estimated error of rainfall component is relatively big in these method. This paper identifies the seepage characteristic of each dams which is not directly affected by rainfall through the hydrograph separation analysis and 3 dimensional analytical method, and thinks a leakage management method. It was noticed that two dams had site specific seepage behaviour features and were in stable state with the decreasing leakage quantity. It was also found that hydrograph separation method might be applicable to leakage safety management method.