• 조명전기설비학회논문지
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• 제28권12호
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• pp.124-129
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• 2014

This paper describes the analysis of the effect on personnel computer in case of turning off power supply of main breaker in general electrical installation. In order to analyze the effect on personnel computer in case of turning off the power supply of main breaker, the switching impulse generator has been designed and fabricated which makes it possible to evaluate the effect on electrical product by switching impulse. The switching impulse tests were carried out for personnel computer according to applied voltage and number of switching impulse. As a consequence, switching impulse had not a significant influence on personnel computer in this study. The varistor of power input section functions as a protection of switching impulse as well as lightning impulse. The results will be used to related organization, and electrical product manufacturer, and residents.

• 한국의류산업학회지
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• 제13권4호
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• pp.511-522
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• 2011

This study analyzed the effects of internet fashion consumer's impulse buying tendency on positive and negative purchasing behaviors. A survey was conducted from October 1 to December 15 in 2010, and 407 responses from internet fashion consumers who made impulse purchases on the internet at least once for the last 6 months were used in the data analysis. As a result, the impulse buying tendency of internet fashion consumers was classified into pure impulse buying, reminder impulse buying, suggestion impulse buying, and stimulus impulse buying. The positive purchasing behaviors such as repurchase intention and purchase satisfaction were influenced by the impulse buying tendency. The all factors of impulse buying tendency had an effect on repurchase intention, while purchase satisfaction was influenced by the reminder impulse buying, suggestion impulse buying, and stimulus impulse buying. The negative purchasing behaviors were classified into delay in decision making and switching intention of purchase. The delay in decision making was influenced by the stimulus impulse buying, suggestion impulse buying, and reminder impulse buying. Also, the reminder impulse buying, suggestion impulse buying and pure impulse buying had an effect on switching intention of purchase. In addition, there were significant differences in the impulse buying tendency and delay in decision making between male and female internet fashion consumers.

• Journal of Advanced Marine Engineering and Technology
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• 제18권2호
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• pp.75-82
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• 1994

The existence of peroodic impulse noises in distribution line carrier (DLC) communication system is known to be the most serious obstacle for improving DLC communication quality in reliability and capacity. From the spectral points, impulse noises can be divided into baseband type and modulation type the noise width of whichs are much different each other. With each nose type, this study presents the basic characteristics in relation to what they originate from and how their spectrum properties are revealed. The baseband type impulse noise is normally caused from thyristor circuit running with low switching speed and the modulation type noise from the circuit of switching power supply. The base wave of modulation noise is shown to be the pulsuatic charging current to primary condenser in switching power circuit. The study result indicates also that placing the DLC carrier frequency away the band predominated by modulated noise especially from RCC type switching power circuit is very important in DLC design.

• 한국전기전자재료학회:학술대회논문집
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• 한국전기전자재료학회 2007년도 추계학술대회 논문집
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• pp.484-485
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• 2007

This paper describes the series-gap characteristics of transmission line arrester with switching and lightning impulse flashover test. The transmission line arrester exhibited external gap because it is must not flashover with switching impulse on the other hand it is must flashover with lightning impulse. In accordance, minimum and maximum length of series-gap was determinated with these tests. As gap length is increased flashover voltage was increased in the range of 315.4 kV~496.3 kV and negative polarity exhibited a high voltage. As a result, It was thought tat the series-gap length of transmission line arrester exhibited in the range of 580 mm~1100 mm.

• Communications for Statistical Applications and Methods
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• 제18권6호
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• pp.871-886
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• 2011

This paper proposes a powerful SVM-ASM filter, the adaptive switching median(ASM) filter based on support vector machines(SVMs), to effectively reduce impulse noise in corrupted images while preserving image details and features. The proposed SVM-ASM filter is composed of two stages: SVM impulse detection and ASM filtering. SVM impulse detection determines whether the pixels are corrupted by noise or not according to an optimal discrimination function. ASM filtering implements the image filtering with a variable window size to effectively remove the noisy pixels determined by the SVM impulse detection. Experimental results show that the SVM-ASM filter performs significantly better than many other existing filters for denoising impulse noise even in highly corrupted images with regard to noise suppression and detail preservation. The SVM-ASM filter is also extremely robust with respect to various test images and various percentages of image noise.

• 한국전기전자재료학회:학술대회논문집
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• 한국전기전자재료학회 2008년도 하계학술대회 논문집 Vol.9
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• pp.491-492
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• 2008

This paper describes the series-gap characteristics of transmission line arrester with switching and lightning impulse flashover test. The transmission line arrester exhibited external gap because it is must not flashover with switching impulse on the other hand it is must flashover with lightning impulse. In accordance, minimum and maximum length of series-gap was determinated with these tests. As gap length is increased flashover voltage was increased in the range of 315.4 kV~496.3 kV and negative polarity exhibited a high voltage. As a result, It was thought tat the series-gap length of transmission line arrester exhibited in the range of 580 mm~1100 mm.

• 대한전자공학회논문지TC
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• 제42권6호
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• pp.61-66
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• 2005

본 논문에서는 Step recovery diode와 반도체 레이저의 이득 스위칭을 이용하여 UWB(Ultra Wide Band) 통신 시스템의 구성요소 중 하나인 임펄스 발생기를 설계하였다. 구현된 임펄스 발생기는 4부분으로 구성하였으며, 1번째는 SRD를 이용하여 반도체 레이저의 이득스위칭을 위한 1차 임펄스 발생기, 2번째는 출력된 1차 임펄스를 이득 스위칭을 조건에 맞추기 위한 전류조절기, 3번째는 1차 임펄스 발생기에서 출력된 임펄스를 반도체 레이저의 이득 스위칭을 이용하여 가우시안 펄스를 발생하는 2차 임펄스 발생기, 4번째는 구현된 가우시안 펄스를 UWB를 위한 가우시안 모노펄스로 변환하는 펄스 변환부로 구성되어 있다. 측정된 가우시안 모노펄스는 시간상에서 360 psec의 펄스폭과 -70 mV에서 +50 mV의 크기를 가지며, 주파수상에서 -41 dBm의 크기와 3.6 GHz의 대역폭을 가짐으로써 UWB를 위한 임펄스에 적합함을 확인하였다.

• 한국정보통신학회:학술대회논문집
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• 한국해양정보통신학회 2009년도 추계학술대회
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• pp.477-481
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• 2009

본 논문에서는 영상신호의 전송과정에서 임펄스 잡음에 의해 훼손된 영상의 복원을 위해 스위칭 평균 필터를 제안 하였다. 이 필터는 크기가 다른 두 가지 크기의 잡음 검출 마스크를 이용하여 잡음요소와 비 잡음요소로 구분하고 영상내의 검출된 임펄스 잡음밀도에 따라 스위칭 평균 필터를 통해 임펄스 잡음을 제거한다. 대체된 화소는 다음 화소의 처리과정에서 이웃화소로 사용되어지는 재귀형태와 비재귀형태 갖도록 하였다. 그리고 시뮬레이션을 통해 기존의 방법들과 그 성능을 비교하였다.

• 대한전기학회논문지:전기물성ㆍ응용부문C
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• 제48권12호
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• pp.777-784
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• 1999

Since the ultra-high voltage power apparatus are recommended to withstand switching surge generated from the electric power system, the switching impulse voltage is generally used to verify this requirement at the testing laboratories. Recently, the international standard(IEC 60060-2) related to the high voltage measurement techniques is revised requiring a traceability of measuring system for high voltage measurements. In this paper, a reference divider for switching impulse voltage is developed satisfying the revised. IEC standard and the possibility of applications has been investigated. Therefore, the characteristics of the high and low voltage side resistor and the shielding ring have been analyzed including the step response characteristics of the prototype divider. Throughout various efforts, it is confirmed that our measuring device has shown compatible characteristics as a reference divider.

• 한국전자파학회논문지
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• 제14권11호
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• pp.1121-1126
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• 2003

본 논문에서 트랜지스터를 이용하여 Ultra Wide Bandwidth(UWB)통신 시스템의 구성 요소의 하나인 임펄스 발생기를 설계하였다. 이 펄스 발생기는 두 가지 스텝으로 이루어져 있다. 첫 번째 스텝에서 트랜지스터 스위칭 동작과 스위칭 동작에 걸리는 시간을 이용하여 트랜지스터의 가우시안 펄스를 만든다. 두 번째 스텝에서 고 대역 통과 필터를 이용하여 모노싸이클 임펄스로 변환시킨다. 결과인 임펄스의 크기는 약 +/-250 ㎷ 정도이고, 펄스의 폭은 0.9 ns로서 펄스폭은 트랜지스터의 동작 시간과 일치하였다.