• Proceedings of the Korean Society of Computer Information Conference
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• 2015.07a
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• pp.272-274
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• 2015

본 논문에서는 하천 인근의 재난 방지를 위한 효율적인 재난감지 알고리즘을 제안한다. 제안하는 알고리즘은 영상처리를 기반으로 임계값을 자동으로 변경시켜 물과 물이 아닌 영역을 분리한다. 수위감지 알고리즘을 단순 물의 색상 정보만을 이용해 분석한다면, 야간 저조도, 폭우와 같은 상황 등에서 알고리즘 성능이 저하될 우려가 있다, 이를 해결하기 위해서 물의 색상 정보뿐 아니라 물의 흔들림 정도도 함께 고려하여 물의 영역을 찾아낸다. 또한 보다 안정적인 수위 분포를 분석하기 위해서 시간과 공간에 대한 필터링을 추가하여 빗물, 물결, 카메라의 화이트 노이즈 등 다양한 노이즈에 보다 안정적으로 수위 분포를 분석한다. 본 논문에서 제안하는 수위감지 알고리즘을 적용한다면, 센서, 목자판 인식 등 이전의 수위계측 방식보다 성능, 비용 면에서 모두 우수할 것으로 예측된다.

• The Transactions of The Korean Institute of Electrical Engineers
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• v.61 no.9
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• pp.1330-1335
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• 2012

This paper proposes an automatic measurement sampling method for the semiconductor manufacturing process. The method recommends sampling rates using information of process capability indexes and production scheduling plan within the restricted metrology capacity. In addition, it automatically controls the measurement WIP (Work In Process) using measurement priority values to minimize the measurement risks and optimize the measurement capacity. The proposed sampling method minimizes measurement controls in the semiconductor manufacturing process and improves the fabrication productivity via reducing measurement TAT (Turn Around Time), while guaranteeing the level of process quality.

• Proceedings of the KIEE Conference
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• 2007.04b
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• pp.31-34
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• 2007

회복전압 측정법(RVM: Recovery voltage measurement)은 최근 유럽지역에서 활발히 연구 진행되고 있는 절연 진단 기법 중의 하나로 소개된바 있으며, 오일과 절연지 사이에 스며든 수분량을 검출할 수 있는 진단 시스템기법이다. 변압기 내부의 절연물질에 대한 분극특성을 분석함으로서 열화진행정도 및 열화정도를 진단하는데 활용될 수 있다. 본 논문은 국산화의 일환으로 전기계측제어용 LabVIEW 프로그램을 활용하여 RVM 전 과정을 자동으로 사용할 수 있도록 자체 제작한 프로그램을 소개하고자 한다.

• Journal of the KSME
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• v.30 no.1
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• pp.4-8
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• 1990

생산 자동화에 필요한 기술을 언급하기에 앞서 우선 자동화에 필요한 기술에 대해 언급하는 것이 순서일 것 같다. 자동화에 필요한 기술을 크게 나눈다면 다음의 세 가지로 요약할 수 있다고 생 각한다. (1) 자동화에 필요한 기본 기술 (2) 이런 기본 기술들에 바탕을 두어 전체 시스템을 구성하는데 필요한 기술 (3) 기본 기술과 전체 시스템 구성 기술을 연결시켜 주는 인터페이싱 기술(정보 처리 기술 포함) 기본 고유 기술은 나름대로 여러 가지로 나눌 수 있겠지만 다음과 같이 여섯 가지로 크게 나 누고 싶다. 첫째는 설계 기술이다. 둘째는 제어 기술이다. 셋째는 가공 기술인데, 특히 정밀 가공 기술은 앞으로 우리가 해결해야 할 난제인 것 같다. 넷째는 운반 및 자동 적재 기술인데, 여기에는 로봇 응용 기술, 컨베이어 기술, 무인 발송차 적용 기술 등이 주된 내용인 것 같다. 다섯째는 조립 기술인데, 이 부분에 대해서는 자동화를 하기 전에 충분한 연구가 필요한 것 같다. 마지막으로 계측 기술인데 최근에 많이 대두되는 문제가 센서 응용 문제이다. 센서는 종류가 다 양하기 때문에 잘 적용하면 적은 비용으로 큰 효과를 보기가 쉽다. 국내에서는 의외로 이 분야에 대한 연구가 자동화에 대한 연구보다 미진한 감이 있다. 특히 형상 센서쪽은 그 적용 범위가 광범위하고 어려운 일을 쉽게 해결해 나갈 수 있다는 이점이 있어서 앞으로 많은 성장이 예상 되지만 적용 기술이 까다로워서 많은 연구가 되어야 한다고 본다.

• Annual Conference of KIPS
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• 2015.10a
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• pp.1826-1829
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• 2015

본 연구는 측정된 심전도와 광용적맥파의 박동특징점을 무결하게 검출하기 위한 프로그램 개발에 관한 것이다. 개발된 프로그램은 생체신호 계측기에서 측정된 생체신호 데이터를 자동 및 수동으로 분석하여 박동특징점의 시간 및 값 정보를 추출 및 저장하는 프로그램으로, 측정된 파형 및 검출된 특징점 위치, 인접한 특징점간 시간 간격을 시각적으로 전달할 수 있는 GUI(Graphic User Interface)를 포함한다. 개발된 프로그램은 기존 연구에서 제시된 심박동, 맥파의 박동 특징점 거출 알고리즘을 사용하여 최초 검출을 수행하고, GUI와 연동되는 컨텍스트 메뉴를 통해 오검출 또는 미검출 정보를 효율적으로 수정할 수 있도록 함으로 비전문가에 의한 쉽고 효율적인 사용이 가능하다.

• Journal of the Korea Academia-Industrial cooperation Society
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• v.21 no.2
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• pp.611-618
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• 2020

The reliability of the results of LCC analysis is determined by accurate analytical procedures and energy data from which the uncertainty is removed. Until now, systems that can automatically measure these energy data and produce databases have not been commercialized. Therefore this paper proposes a concept model of an S-LCC platform that can automatically collect and analyze electric energy consumption data of equipment systems using the IOT, which is the core tool in the Fourth Industrial Revolution and operates the equipment system efficiently using the analyzed results. The proposed concept model was developed by the convergence of existing BLCS and IOT and was comprised of five modules: Facility Control Module, LCC Analysis Module, Energy Consumption Control Module, Efficiency Analysis Module, and Maintenance Standard Reestablishment Module. Using the results of LCC analysis deduced from this system, the deterioration condition of an equipment system can be identified in real-time. The results can be used as the baseline data to re-establish standards for the maintenance factor, replacement frequency, and lifetime of existing equipment, and establish new maintenance standards for new equipment. If the S-LCC platform is established, it would increase the reliability of LCC analysis, reduce the labor force for entering data and improve accuracy, and would also change disregarded data into big data with high potential.

• The Journal of Korea Institute of Information, Electronics, and Communication Technology
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• v.15 no.5
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• pp.349-359
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• 2022

The aim of this study is to analyze the dynamic characteristics of proportional control valves according to various working conditions as a basic study for developing proportional control valves for auto-steering tractors. The dynamic characteristics of proportional valves were measured using hydraulic characteristics measurement system, and the power was analyzed using measured flow rate and pressure data. As the experimental conditions, the tractor engine speed and steering angle was selected as the main variables, and the experiment was performed on urethane road conditions. As a result, it was found that the flow rate, pressure, and power of the proportional control valve increased as the tractor engine speed and steering angle increased. In particular, as the steering angle increased at the same engine speed, the flow rate, pressure, and power tended to increase by up to 190%, 172%, and 273%, respectively. Similarly, as the engine speed increased at the same steering angle, the flow rate, pressure, and power tended to increase up to 161%, 122%, and 168%, respectively. Therefore, it can be seen that the steering angle has a higher influence on the dynamic characteristics of the proportional control valve than the engine speed.

• KSCE Journal of Civil and Environmental Engineering Research
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• v.34 no.2
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• pp.415-424
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• 2014

The carrying capacity of existing concrete structures is evaluated by the measured data from displacement and strain gauges for given loads and the results of numerical analysis that are compared with the measured ones. Consequently, this process could be accomplished in doing the direct measurement of residual stress on existing concrete. This study is concerned with the development of IITC (Instrumented Indentation Technique for Concrete) system which is based on the experimental stress analysis technique using non-destructive test method to evaluate the residual stress of concrete structures depending on the types of applied loadings in analysing indentation load - indentation depth curve derived experimentally on concrete surface. As a result, in this paper, almost all of systematized H/W and S/W were newly developed to estimate the residual stresses of concrete structures. Thus, the creation of new experimental equations for deriving residual stresses and automatical calculations of residual stresses using the empirical formula can lead to evaluate the structural resistances conveniently in the structures from construction phase to maintenance stage.

• Journal of the Korean Society of Hazard Mitigation
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• v.10 no.4
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• pp.89-93
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• 2010

It is well known that the drastic change of hydrological characteristics of an urbanized basin causes severe runoff, sediment yield, and peak flow. High vulnerability of urban flood disasters is caused by land-use change and development of a basin. A typical site suffering urbanization was selected and the experimental site has being operated last three years. Hydrological and hydraulic characteristics of the urbanizing basin were examined by observation of runoff, sediment loads and precipitation with T/M. The effects of land-use change were analyzed by examination of the hydrological characteristics, such as run-off ratio (runoff volume/rainfall volume), sediment yields. Runoff coefficient of rational equation was increased as basin was urbanized. Suspended sediment yields due to a urban development activities were raised almost 10 times compare to undisturbed condition for small runoff less than 1 cms. Meanwhile, no big change could be detected for bed loads.

• Journal of KIISE:Computing Practices and Letters
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• v.15 no.3
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• pp.211-215
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• 2009

As Programmable Logic Controllers (PLCs) are increasingly used to implement safety critical systems such as nuclear instrumentation & control system, formal verification for PLC based programs is becoming essential. This paper proposes a formal verification technique for PLC program implemented with function block diagram (FBD). In order to verify an FBD program, we translate an FBD program into a Verilog model and perform model checking using SMV model checker We developed a tool, FBD Verifier, which translates FBD programs into Verilog models automatically and supports efficient and intuitive visual analysis of a counterexample. With the proposed approach and the tool, we verified large FBD programs implementing reactor protection system of Korea Nuclear Instrumentation and Control System R&D Center (KNICS) successfully.