• Title, Summary, Keyword: breakdown detection

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Memory Attention-based Breakdown Detection for Natural Conversation in Dialogue System (대화 시스템에서의 자연스러운 대화를 위한 Memory Attention기반 Breakdown Detection)

  • Lee, Seolhwa;Park, Kinam;Lim, Heuiseok
    • Annual Conference on Human and Language Technology
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    • pp.31-34
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    • 2018
  • 대화 시스템에서 사람과 기계와의 모든 발화에서 발생하는 상황들을 모두 규칙화할 수 없기 때문에 자연스러운 대화가 단절되는 breakdown 현상이 빈번하게 일어날 수 있다. 이런 현상이 발생하는 이유는 다음과 같다. 첫째, 대화에서는 다양한 도메인이 등장하기 때문에 시스템이 커버할 수 있는 리소스가 부족하며, 둘째, 대화 데이터에서 학습을 위한 annotation되어 있는 많은 양의 코퍼스를 보유하기에는 한계가 있으며, 모델에 모든 대화 흐름의 히스토리를 반영하기 어렵다. 이런 한계점이 존재함에도 breakdown detection은 자연스러운 대화 시스템을 위해서는 필수적인 기능이다. 본 논문은 이런 이슈들을 해소하기 위해서 memory attention기반의 새로운 모델을 제안하였다. 제안한 모델은 대화내에 발화에 대해 memory attention을 이용하여 과거 히스토리가 반영되기 때문에 자연스러운 대화흐름을 잘 detection할 수 있으며, 기존 모델과의 성능비교에서 state-of-the art 결과를 도출하였다.

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The Application of Pre-Breakdown Partial Discharge Detection Method for Breakdown of Investigation of Long Distance XLPE Cable (장조장 XLPE 케이블 절연 파괴 원인 규명을 위한 전구차단 장치의 응용)

  • Lee, C.Y.;Kim, D.W.
    • Proceedings of the KIEE Conference
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    • pp.1827-1829
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    • 2002
  • This paper describes AC test for long delivered drum length of cable using pre-breakdown partial discharge detection(PPD) method, which can be applied to observe the causes of electrical breakdown of EHV XLPE insulation. This method is to de-energize applied voltage to cable rapidly using pre-breakdown partial discharge, and is able to prevent complete breakdown. By this effect, defects such as voids, metal particles and protrusion in cable can be observed clearly. AC resonant test set was used for PPD method. Localization of partial discharge was performed by time difference detection of the traveling wave. Accuracy of localization was 1% to the length of test cable. Through several experiments with XLPE cable, successful results of PPD method were obtained.

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The Misfire Detection and Intensity Interpretation using Breakdown Voltage Characteristics (브레이크다운전압 특성을 이용한 엔진실화의 검출 및 강도해석)

  • 고용수;박재근;조민석;황재원;채재우
    • Transactions of the Korean Society of Automotive Engineers
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    • v.7 no.6
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    • pp.42-48
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    • 1999
  • Engine misfire causes of the negative effect on exhaust emission such as HC, CO, and NOX . Moreover, it causes damage to the three-way-catalyst(TWC) system permanently. The crankshaft velocity fluctuation(CVF) method has been applied for the real cars as misfire detection system usually, which utilizes the crank angle sensor input to calculate the variation of the crankshaft rotational speed. But this approach has the limit due to the fact that three could be problem under certain engine condition like as deceleration or high speed condition . Therefore the development of new methods are requested today. This study introduced the new method of misfire detection using breakdown voltage(BDV) characteristics between spark plug electrouds.

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A Study on the knock and misfire detection system using by Spark-plug in a Gasoline Engine (가솔린기관에서 스파크플러그를 이용한 노크 및 실화의 동시검출시스템 개발에 관한 연구)

  • 조민석;박재근;황재원;채재우
    • Transactions of the Korean Society of Automotive Engineers
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    • v.8 no.1
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    • pp.23-31
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    • 2000
  • Knock and misfire, kinds of abnormal combustion, are highly undesirable effect on the internal combustion engine. So, it is important to detect these avnormal combuition and control the ignition timing etc. to avoid these mal-effect factors in real engine system. In this study, the system which detects the knock and the misfire using by spark plug is presented. This system is based on the effect of modulation breakdown voltage(BDV) between the spark gaps. The voltage drop between spark plug electrodes, when an electrical breakdown is initiated, depends on the temperature and pressure in combustion chamber. So, we can detect knock and misfire that produce changes in gas temperature and pressure (consequently, its density) using by BDV signal change which carries information about the character of combustion.

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Detection Capability by Change of Amylograph Characteristics of Irradiated Black Pepper (방사선 조사된 검은후추가루의 Amylograph Characteristics의 변화에 따른 검지 가능성)

  • Yi, Sang-Duk;Oh, Man-Jin;Yang, Jae-Seung
    • Korean Journal of Food Science and Technology
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    • v.33 no.2
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    • pp.195-199
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    • 2001
  • A study was carried out to establish a detection method for irradiated black pepper using amylograph characteristics. The maximum viscosity, viscosity at $93^{\circ}C$, viscosity after 15 min at $93^{\circ}C$, viscosity at $45^{\circ}C$, viscosity after 30 min at $45^{\circ}C$, and viscosity after 60 min at $45^{\circ}C$ decreased with increasing irradiation doses, but initial pasting temperatures, maximum viscosity temperatures, breakdown, setback, and consistency did not show great changes. The high correlation coefficients $(R^2>0.97)$ were shown between irradiation doses and amylograph characteristics except for breakdown $(R^2>0.75)$, setback $(R^2>0.88)$ and consistency $(R^2>0.31)$. These results suggest that detection of irradiated black pepper is possible using amylograph characteristics.

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Development of Misfire Detection Using Spark-plug (스파크플러그를 이용한 실화감지에 관한 연구)

  • 채재우;이상만;정영식;최동천
    • Transactions of the Korean Society of Automotive Engineers
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    • v.5 no.1
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    • pp.27-37
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    • 1997
  • Internal combustion engine is the main source of environmental pollutants and therefore better technology is required to reduce harmful elements from the exhaust gases all over the world. Especially, harmful elements from the exhaust gases are caused by incomplete combustion of mixture inside the engine cylinder and this abnormal combustion like misfire or partial burning is the direct cause of the air pollution and engine performance degradation. the object of this research is to detect abnormal combustion like misfire and to keep the engine performance in the optimal operating state. Development of a new system therefore could be applied to a real car. To realize this, the spark-plug in a conventional ignition system is used as a misfire detection sensor and breakdown voltage is analyzed. In this research, bias voltage(about 3kV) was applied to the electrodes of spark-plug and breakdown voltage signal is obtained. This breakdown voltage signal is analyzed and found that a combustion phenomena in engine cylinder has close relationship with harmonic coefficient K which was introduced in this research. Newly developed combustion diagnostic method( breakdown voltage signal analysis) from this research can be used for the combustion diagnostic and combustion control system in an real car.

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The Diagnosis of Treeing Breakdown Using Simultaneous Detection of Electrical Charge and Acoustic Emission Pulse of Partial Discharge (부분 방전 전하와 음향 방출 펄스의 동시 측정에 의한 트리잉 파괴 진단)

  • 김성홍;박재준;김재환
    • Electrical & Electronic Materials
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    • v.10 no.3
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    • pp.247-254
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    • 1997
  • Internal voids in insulators give rise to partial discharge, which causes a local breakdown and even entire insulation breakdown. Recently, the necessity of establishing the way to diagnose the aging of insulation materials and to predict of insulation breakdown become important. The purpose of our work are to investigate the treeing phenomena with an artificial needle shaped void by the charge of discharge and acoustic emission pulse in each phase angle area at the same time. We analyzed the .PHI.-QA-t pattern and .PHI.-AEA-t pattern using statistic operators such as pulse magnitude, pulse number, skewness, kurtosis. Therefore, the relation between the charge of discharge and acoustic emission pulse will be helpful to predict the breakdown just before the breakdown occur.

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The Diagonosis of Treeing Breakdown Simultaneous Detection on Charge of Partial Discharge and Acoustic Emission Pulse (방전 전하와 음향 방출 펄스의 동시 측정에 의한 트리잉 파괴 진단)

  • Choi, J.K.;Kim, S.H.;Park, J.J.;Kim, J.H.
    • Proceedings of the KIEE Conference
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    • pp.1781-1783
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    • 1996
  • Recently, the necessity of establishing the way to diagnose the aging of insulation materials and to predict of insulation breakdown become important. The purpose of our work are to investigate the treeing phenomena with a artificial needle shape void by the charge of partial discharge and acoustic emission pulse in each phase angle area at the same time. We have analyzed the ${\Phi}-Q-n$ pattern and the insulation diagnosis of the samples using statistic operators such as charge magnitude and A.E pulse factor, skweness, kurtosis, G,C. Therefore, the relation between the charge of partial discharge and A.E pulse will be helpful and efficient to predict the breakdown just before the breakdown occure.

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Investigations on PD Characteristics of Thermal aged Palm and Corn Oil for Power Transformer Insulation Applications

  • Senthilkumar, S.;Karthik, B.;Chandrasekar, S.
    • Journal of Electrical Engineering and Technology
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    • v.9 no.5
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    • pp.1660-1669
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    • 2014
  • Partial discharge (PD) detection plays a major role in the life time assessment of liquid insulation in power transformers. Many research works are being carried out to replace conventional mineral oil insulation in transformers by vegetable oils. It is necessary to understand the PD characteristics of vegetable oils before recommending them as an alternate for mineral oil. In this paper, the breakdown strength and PD characteristics of palm and corn oil were investigated in both unaged and thermally aged conditions. Laboratory experiments were performed as per IEC test procedures. PD signals were measured using wide band detection system. Phase resolved PD pattern of vegetable oils and mineral oil were compared. Effect of increase in voltage stress on the PD pattern of palm and corn oil were studied. Time and frequency domain analysis of PD pulses at needle-plane electrode configuration was carried out. Statistical analysis of PD pattern i.e. skewness and shape parameter variations with respect to applied thermal stress were also carried out. From the results, it is observed that palm and corn oils have better breakdown strength and PD characteristics even under long-term thermal stress and hence they can be used for power transformer applications.

A study on the insulation detection for electrical machnes by corona pulse technique (Corona pulse 검출에 의한 전력기기절연진단에 대한-고찰)

  • 성영권;정성계;김왕곤
    • 전기의세계
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    • v.16 no.5
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    • pp.15-18
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    • 1967
  • This paper shows the analysis for mechanisms of corona pulse caused by dielectric breakdown, and for the results of observed values on an actual machines with the this corona pulse technique. Although the above results are not directly related with the generation, numbers or wave of the corona pulse, it may possibly be chanced a judgement of dielectric breakdown and one of better synthetic judgement methods for actual electrical machines.

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