• 한국정보통신학회논문지
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• 제26권3호
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• pp.469-478
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• 2022

본 논문은 산업용 생산 장비의 부하 전력을 모니터링하기 위한 스마트 디바이스와 애플리케이션을 개발하고 성능을 평가한 결과를 담고 있다. 스마트 디바이스는 산업용 생산 장비의 부하 전력 및 동작 환경 데이터를 수집해 이를 서버로 전송하는 기능을 가진 스마트 전력 디바이스와 이의 경량화 버전에 해당하는 에너지 미터링 디바이스로 구분해 하드웨어와 더불어 펌웨어를 개발하였다. 이들 디바이스에서 수집한 부하 전력 데이터는 AWS(Amazon Web Services) 서버내 MariaDB에 저장될 수 있도록 하였으며, RESTFul API를 이용해 웹사이트 및 모바일 애플리케이션 상에서 그래프 형태로 부하 전력을 모니터링할 수 있도록 구현하였다. 개발 시스템의 성능을 평가하기 위해 MariaDB에서 웹사이트 및 모바일 애플리케이션까지의 응답 시간을 측정하였으며, 4G(LTE) 네트워크 환경에서는 0.0256~0.0545초, 3G 네트워크 환경에서는 0.6126~1.2978초로 만족스러운 결과를 보여줌을 알 수 있었다.

• 전기학회논문지
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• 제57권1호
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• pp.58-64
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• 2008

In this paper, we present an active anti-islanding method with a load monitoring system using reactive power control. The proposed method, which is based on reactive power control, has fewer harmonics components than those in conventional methods, and it can minimize the reactive power component of the grid because it compensates the reactive power component with the load monitoring. The proposed quick islanding detection method was confirmed from the experimental results with an inverter for a 3kW photovoltaic system.

• 한국소음진동공학회:학술대회논문집
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• 한국소음진동공학회 2001년도 춘계학술대회논문집
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• pp.590-595
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• 2001

Vibration transient generated by developing localized fault in gear can be used as indicators of condition monitoring in a gear. In this paper, we propose the phase map for a fault signal using continuous wavelet transform to detect this vibration transient. Local fault induces the abrupt fluctuation of load exciting tooth and phase lag in the vibration signal measured on the gearbox. The relatively large fault like "tip breakage" easily can be detected by the clear fluctuation of exciting load. However, minor fault like "initial pitting" cannot be detected using the load fluctuation. To detect this kind of minor fault, the phase map for a fault signal is taken into account. The phase lag by minor fault is observed well in the phase map.

• Smart Structures and Systems
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• 제1권2호
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• pp.159-184
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• 2005

The paper intends to summarize some guidelines for future smart structure system application in military aircraft. This preview of system integration is based upon a review on approximately one and a half decades of application oriented aerospace related smart structures research. Achievements in the area of structural health monitoring, adaptive shape, adaptive load bearing devices and active vibration control have been reached, potentials have been identified, several feasibility studies have been performed and some smart technologies have been already implemented. However the realization of anticipated visions and previously initial timescales announced have been rather too optimistic. The current development shall be based on a more realistic basis including more emphasis on fundamental aircraft strength, stiffness, static and dynamic load and stability requirements of aircraft and interdisciplinary integration requirements and improvements of integrated actors, actuator systems and control systems including micro controllers.

• Wind and Structures
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• 제16권4호
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• pp.393-409
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• 2013

This paper uses ten years of on-site monitoring data for the Confederation Bridge to derive wind loads and investigate whether the bridge has experienced its design wind force effects since its completion in 1997. The load effects derived using loads from the on-site monitoring data are compared to the load effects derived using loads from the 1994 and 2009 wind tunnel aerodynamic model tests. The research shows, for the first time, that the aerodynamic model-based methodology originally developed in 1994 is a very accurate method for deriving wind loads for structural design. The research also confirms that the bridge has not experienced its specified (i.e., unfactored) wind force effects since it was opened to traffic in 1997, even during the most severe event that has occurred during this period.

• 한국정보처리학회:학술대회논문집
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• 한국정보처리학회 2019년도 추계학술발표대회
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• pp.384-387
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• 2019

2018년 Meltdown 공격이 발표된 이후 Foreshadow, ZombieLoad 등 다양한 종류의 마이크로아키텍처 기반 부 채널 공격과 방어 기법들이 발표되었다. 그중 Meltdown 공격을 원천 차단할 수 있는 KPTI (Kernel Page Table Isolation)는 커널 영역을 사용자 메모리 영역과 분리하여 커널 정보의 유출을 방어할 수 있으나, 최대 46%의 시스템 성능 저하를 가져온다. 본 연구는 런타임에 시스템콜 발생빈도를 분석하여 낮은 오버헤드로 Meltdown-type 공격을 탐지하고, 방어하는 프로그램을 개발하고 실험하였다. 개발한 Fault Monitoring Tool은 기존 시스템 대비 적은 오버헤드(최대 7%)로 악의적인 사용자를 구분해 내고 방어할 수 있었다.

• 한국지능시스템학회:학술대회논문집
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• 한국퍼지및지능시스템학회 2001년도 추계학술대회 학술발표 논문집
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• pp.78-82
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• 2001

Electronic Weighting Machine is used an electronic scale which has many trouble because of broken load cells. In this paper, we propose an intelligent Diagnosis System will for an electronic weighting machine using fuzzy logic. It's purpose be detect of the load cell's trouble. The electronic circuit of system, which call 'junction box', will be connected resistances in a series at circuit of Wheatstone Bridge for monitoring the condition of load cells.

• 한국농공학회:학술대회논문집
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• 한국농공학회 2001년도 학술발표회 발표논문집
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• pp.475-478
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• 2001

Runoff and nutrient concentrations were monitored to identify pollutant load characteristics of a subwatershed in the Jooam lake. Observed concentrations of T-N and T-P were $1.445{\sim}3.980mg/{\ell}\;and\;0{\sim}0.273mg/{\ell}$, respectively. Runoff load of T-N, T-P by single storm occurred June 24th 2001 contributed 55% of T-N and 41% T-P of total pollutant load during study period.

• 대한전기학회논문지
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• 제43권2호
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• pp.179-188
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• 1994

This paper deals with implementation of an expert system to obtain an optimal plan of load transfer for fault restoration with the capability of security monitoring and assessment in distribution systems. Based on the technique of load transfer tree analysis, the proposed expert system can afford to assist system operators in proposing an optimal plan of load transfer for fault restoration, In paticular, an application of the proposed ES to practical distribution systems yields an optimal load transfer plan which ensures system security by considering security assessment for contingency of feeders and main transformers in the knowledge based sense.

• 대한전기학회:학술대회논문집
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• 대한전기학회 2005년도 제36회 하계학술대회 논문집 D
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• pp.2738-2740
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• 2005

From composition transmitter is detached in indicator to individual load direction of 4 channels and adding up display by load cell indicator indication method of Bluetooth way is identifying marks.