• 비파괴검사학회지
• /
• 제16권3호
• /
• pp.155-161
• /
• 1996

회전 기계의 저어널 베어링 상태를 음향 방출(AE) 기술을 활용하여 감시하기 위한 진단 시스템을 개발하였다. AE 기술은 베어링 시스템에 있어서 비정상 상태를 탐지하기 위하여 이용된다 모의 저어널 베어링시스템을 이용한 실험과 실제 발전 설비에 대한 적용 시험의 결과로부터 AE 신호 파라메타 중에서 rms voltage가 가장 유효한 것으로 판명되었으며, 이러한 연구 결과를 토대로 하여 진단 시스템의 알고리즘과 판단 기준들이 설정되었다. 베어링 진단 시스템은 AE 센서 및 전치앰프로 구성된 신호 감지부, AE rms voltage를 측정하기 위한 rms-to-DC 변환 회로부로 구성된 신호 처리부, A/D 변환기를 이용하여 rms voltage 신호를 PC에 연결해 주는 인터페이스부, 베어링 상태 보기와 진단 프로그램을 포함하는 그래픽 디스플레이 및 소프트웨어부의 4부분으로 구성된다.

• 한국컴퓨터산업학회논문지
• /
• 제6권3호
• /
• pp.509-518
• /
• 2005

원격 모니터링 시스템(RMS; Remote Monitoring System)은 산업의 자동화 과정에 따라 다양한 분야에 적용되고 있으며, 단순한 상태 감시기능에서 멀티미디어 인터페이스 기반의 실시간 제어 기능을 갖는 복합 응용시스템으로 발전하고 있는 추세이다. 본 연구에서는 네트워크로 연동된 원격 사이트의 타겟 시스템(target system)을 클라이언트의 웹 브라우저에서 모니터링 할 수 있는 감시기능과 특정 동작을 제어할 수 있는 제어기능을 갖는 웹 기반 모니터링 시스템을 개발하였다. 개발 시스템은 클라이언트가 웹 브라우저에서 타겟 시스템의 상태를 실시간으로 감시할 수 있는 모니터링 기능, 클라이언트가 모니터링 화면에서 특정 모듈의 값을 설정함으로써 시스템의 상태를 제어하는 출력제어 기능, 클라이언트가 웹 환경에서 타겟 시스템의 환경 변수를 직접 설정 또는 변경할 수 있는 환경설정 기능, 네트워크에 연동된 화상카메라를 이용하여 타겟 시스템 주변 환경을 비디오로 감시할 수 있는 비디오 감시기능 등으로 구성되어 있다. 본 RMS는 웹 기반의 인터페이스로 타겟 시스템에 쉽게 접근 및 관리가 가능하며, 특히, 무인 자동화 설비 및 폐쇄 공간 등에서 유용하게 활용될 수 있다.

• 한국원자력학회:학술대회논문집
• /
• 한국원자력학회 2001년도 춘계학술발표회요약집
• /
• pp.334.2-334
• /
• 2001

• 정보관리학회지
• /
• 제4권1호
• /
• pp.154-169
• /
• 1987

본 논문은 울진 원자력 발전소 건설현장의 자료관리업무를 검토, 분석하여 전산화 대상업무의 논리체계를 세워 카드장표에 의한 수작업 관리방법을 전산 자동화처리가 가능하도록 시도한 것이다. 마스타화일의 레코드구조는 서지데이타, 자료송부관련데이타, 배부관련데이타, 구역구분데이타, 건설후 자료관리 데이터 등으로 구성하였으며 배부, 화일, 검색업무 및 통계, 보고서 출력업무의 논리체계를 설계하였다. 특히 건설중의 자료관리목적이외에 건설후 자료관리를 위한 색인매개요소로서 시스템코드, 한전설비분류번호, 자재연결코드, 보존기간 등을 건설중의 자료입수 시점에서 입력하도록 설계하여 발전소 운전중의 자료검색요구를 사전에 준비하고자 하였다. 또한 본 연구의 결과는 자료관리시스템과 자재관리시스템 사이에서의 상호참조가 용이하도록 설계하였다.

• Radiation Oncology Journal
• /
• 제34권4호
• /
• pp.290-296
• /
• 2016

Purpose: Radiotherapy (RT) is considered a mainstay of treatment in parameningeal rhabdomyosarcoma (PM-RMS). We aim to determine the treatment outcomes and prognostic factors for PM-RMS patients who treated with RT. In addition, we tried to evaluate the adequate dose and timing of RT. Materials and Methods: Twenty-two patients with PM-RMS from 1995 to 2013 were evaluated. Seven patients had intracranial extension (ICE) and 17 patients had skull base bony erosion (SBBE). Five patients showed distant metastases at the time of diagnosis. All patients underwent chemotherapy and RT. The median radiation dose was 50.4 Gy (range, 40.0 to 56.0 Gy). Results: The median follow-up was 28.7 months. Twelve patients (54.5%) experienced failure after treatment; 4 local, 2 regional, and 6 distant failures. The 5-year local control (LC) and overall survival (OS) were 77.7% and 38.5%, respectively. The 5-year OS rate was 50.8% for patients without distant metastases and 0% for patients with metastases (p < 0.001). Radiation dose (<50 Gy vs. ${\geq}50Gy$) did not compromise the LC (p = 0.645). However, LC was affected by ICE (p = 0.031). Delayed administration (>22 weeks) of RT was related to a higher rate of local failure (40.0%). Conclusion: RT resulted in a higher rate of local control in PM-RMS. However, it was not extended to survival outcome. A more effective treatment for PM-RMS is warranted.

• 한국전문물리치료학회지
• /
• 제13권2호
• /
• pp.61-69
• /
• 2006

The purpose of this study was to compare the electromyography (EMG) activities of the lumbar extensor muscles during motion of trunk flexion-extension and compare range of motion (ROM) with a 3-dimensional motion analysis system of the lumbar region between subjects with chronic low back pain (CLBP) and healthy subjects during the trunk flexion-extension, trunk rotation and trunk lateral flexion cycle. Thirty CLBP subjects and thirty healthy subjects were included. We measured the root mean square (RMS) value of the lumbar extensor muscles from resting, standing, lumbar flexion and return position. The RMS ratio was normalized from maximal EMG activity of the lumbar extensor muscles during trunk motion. The results of this study showed that the RMS ratio of the lumbar extensor was significantly higher in CLBP subjects than healthy subjects during all of trunk motion (p<.05). The ratio of the highest RMS value during flexion and extension was higher in CLBP subjects than in healthy subjects (p<.05). The ROM of the lumbar region was significantly lower in CLBP subjects than healthy subjects during trunk flexion-extension, trunk rotation and lateral flexion cycle. The relationship between the RMS ratio for full lumbar flexion and the ROM of lumbar flexion was not correlated significantly. CLBP subjects have both decreased ROM of the lumbar region and higher muscle activities of the lumbar extensor muscle than healthy subjects.

• 한국생산제조학회지
• /
• 제7권6호
• /
• pp.90-96
• /
• 1998

The ductile cast iron is austempered at 300, 350 and 40$0^{\circ}C$ temperature in order to investigate the basic factors for monitoring drill wear in automatic production process, and cutting force and AE RMS signals are measured with changing cutting condition for ADI(Austempered Ductile Cast Iron) with different mechanical properties. The signals of cutting force were influenced by cutting speed and feedrate greatly. On the other hand AE RMS signals are influenced by cutting speed where as it is not related with feedrate. As the depth of drilling increases, cutting force shows a slow increase and the value of AE RMS increases until the range of h/d=4. But over the range it increases greatly due to an amount of chip discharge and friction with inner wall of drilling hole, etc. As the drill diameter increases at a constant depth of drilling. Cutting force increases linearly, but the level of AE RMS does not increases linearly due to circumferential velocity and great influence of h/d.

• 정보관리학회지
• /
• 제4권2호
• /
• pp.139-151
• /
• 1987

본 논문은 울진 원자력 발전소 건설현장의 자료관리업무를 검토, 분석하여 전산화 대상업무의 논리체계를 세워 카드장표에 의한 수작업 관리방법을 전산 자동화처리가 가능하도록 시도한 것이다. 마스타화일의 레코드구조는 서지데이타, 자료송부관련데이타, 배부관련테이타, 구역구분데이타, 건설후 자료관리 데이타 등으로 구성하였으며 배부, 화일, 검색업무 및 통계, 보고서 출력업무의 논리체계를 설계하였다. 특히, 건설중의 자료관리목적이외에 건설후 자료관리를 위한 색인매개요소로서 시스템코드, 한전설비분류번호, 자재연결코드, 보존기간 등을 건설중의 자료입수 시점에서 입력하도록 설계하여 발전소 운전중의 자료검색요구를 사전에 준비하고자 하였다. 또한 본 연구의 결과는 자료관리시스템과 자재관리시스템 사이에서의 상호참조가 용이하도록 설계하였다.

• 한국안전학회지
• /
• 제28권3호
• /
• pp.63-68
• /
• 2013

This paper is aimed to make an analysis on characteristics of the parallel arc waveform and RMS of current at the electrical tracking state by conductive powder. In order to achieve the goal in this paper, field state investigation at metal processing companies in Chung-Nam province area was conducted. With the field state investigation, conductive powder were collected from metal processing companies. By experiment on electrical connector(breaker, connector) over which the conductive powder were scattered, arc waveform and RMS of current were measured. The measured waveform and RMS(root-mean-square) of current were analyzed to describe characteristics and patterns of electrical arc by the conductive powder. It was proved that conductive powder on electrical connector can flow electrical current enough to make electrical fire with high thermal energy. Also the change of sine waveform and RMS of current can be used to find out relationship between electrical fire and fault signal by conductive powder. The results obtained in this paper will be very helpful for the prevention of electrical fires occurred at the metal processing companies.

• Journal of Power Electronics
• /
• 제15권4호
• /
• pp.1139-1147
• /
• 2015

In this paper, an algorithm based on a model analysis of the online calculation of the root-mean-square (RMS) value of welding current for single-phase AC resistance spot welding (RSW) was developed. The current is highly nonlinear and typically non-sinusoidal, which makes the measuring and controlling actions difficult. Though some previous methods focused on this issue, they were so complex that they could not be effectively used in general cases. The electrical model of a single-phase AC RSW was analyzed, and then an algorithm for online calculation of the RMS value of the welding current was presented. The description includes two parts, a model-dependent part and a model-independent part. Using a previous work about online measurement of the power factor angle, the first part can be solved. For the second part, although the solution of the governing equation can be directly obtained, a lot of CPU time must be consumed due to the fact that it involves a lot of complex calculations. Therefore, a neural network was employed to simplify the calculations. Finally, experimental results and a corresponding analysis showed that the proposed algorithm can obtain the RMS values with a high precision while consuming less time when compared to directly solving the equations.