• Korean journal of communication and information
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• v.34
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• pp.98-131
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• 2006

The objective of this study is to review diverse determinants of windowing in Korean drama such as rating, theme, type of drama, quantity of newsbreak and independent production. The after-market will be overseas market, domestic cable TV and emerging two revenue sources such as VOD and DVD. Korean dramas aired on free TV between 2000 and 2004 will be analysed by chi-square.

• Tribology and Lubricants
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• v.17 no.1
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• pp.33-39
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• 2001

A method of calculating wear volume is developed using the signal processing technique. The lowpass filter with Fourier transform and the “windowing” are implemented in the method. User-defining feature is also included in determining the cutoff frequency of the low-pass filter and the baseline for the volume integration. Commercial software, MatLab, is used for the programming. Since the method uses the original wear data without simplifying the wear shape, it can give a further accurate result than the previously utilized methods, which often adopted the simplification. It becomes further powerful if the contacting body has a general shape rather than that gives well-formed surface traction (e.g., the Hertzian). The validation of applying the average surface roughness, Ra, to the “windowing” and the baseline for volume integration is discussed.

• The Journal of Korean Institute of Communications and Information Sciences
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• v.17 no.12
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• pp.1475-1483
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• 1992

In this paper, a Fuzzy control approach of disturbance added servo system using MWT(modified windowing technique) was proposed. Because conventional windowing techniques adjust stepwisely a series of scale factors, even small disturbances make system unstable. But the proposed MWT adjusts exponentially. Therefore a servo system which applied this technique had coped excellenlty with internal and external disturbances, and also had decreased substantially steady-state deviation.

• Journal of the Korean Institute of Telematics and Electronics
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• v.20 no.6
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• pp.37-42
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• 1983

The TV IF SAW filter if designed using the windowing method. The procedure for fabricating SAW filters is described. The filter is fabricated on the Y-cut, Z-propagation LiNbO3 wafer. The passband ripple and the smaller upper sidelobe attenuation are obseryed. Further improvements and the mass production can be expected.

• The Journal of Korean Institute of Electromagnetic Engineering and Science
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• v.21 no.6
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• pp.635-641
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• 2010

Time-varying channel characteristics in OFDM systems over doubly selective channels cause inter-carrier interferences(ICI) in the frequency domain. Time domain windowing gives rise to restriction on the bandwidth of the frequency domain channel matrix and makes it possible to approximate the OFDM system as a simplified linear input-output model. When successive interference cancellation based on linear MMSE estimation is employed for channel equalization in OFDM systems, symbol detection ordering produces considerable effects on overall system performances. In this paper, we show the reduction of the residual ICI by time domain windowing and the resultant performance improvements, and investigate the effects of SINR- and CSEP-based symbol detection ordering on the performance of successive interference cancellation.

• Journal of the Korea Institute of Information and Communication Engineering
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• v.20 no.5
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• pp.963-971
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• 2016

This paper is a research of gaze analysis for measuring task switching behavior at multiple windows in GUI of windowing system. Previous methods that define area of interest for categorizing gaze had difficulties to define dynamic content that disappears or changes over time. On the other hand, this study suggests a new method to categorize gaze that defines Area of interest in a unit of window during the eye tracking experiment. In this paper, we constructed the conception of WOI(Window of Interest) in GUI of windowing system. Therefore, we developed a system using an eye tracker device and implemented a number of experiments. In addition, we analyzed the number of task switching and proportion of watched content. The method in the study comprehend from previous researches as it can measure and analyze the multi-tasking behaviors using multiple numbers of windows.

• Journal of The Korean Radiological Technologist Association
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• v.29 no.1
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• pp.270-270
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• 2003

• Journal of the Korean Institute of Telematics and Electronics B
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• v.33B no.4
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• pp.72-80
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• 1996

In this paper, variable windowing mean filter to remove speckle noise and a measure to detect thin edge in ultrasonic images are proposed. Because ultrasonic images are corrupted by speckle noise showing a granular appearance, good edge detection is difficult. As a result, noise removing filter is needed in preprocessing stage. The speckle noise removing filter is based on mean filter whose window size is changed by the ratio of standard deviation to mean for image signal and noise signal in local area. And the measure expressed the difference of means between tow windows is used for detecting thin edge in filtered image. Results show that variable windowing mean filter removes speckle noise effectively, and proposed measure is useful in detecting thin edge.

• Proceedings of the Korean Society of Broadcast Engineers Conference
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• 2001.11b
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• pp.71-76
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• 2001

OFDM(Orthogonal Frequency Division Multiplexing)의 단점인 높은 PAPR(Peak-to-Average Power Ratio)을 개선하기 위한 방법 중에서 SDT(Signal Distortion Technique)는 전송시스템의 규격 및 수신기의 변경 없이도 적용 가능한 이점이 있다. 본 논문에서는 SDT에 속하는 clipping과 peak windowing 기법을 Eureka 147 DAB(Digital Audio Broadcasting) 시스템에 적용하여 얻은 BER 및 PSD 성능결과를 토대로 PAPR 개선 정도에 따른 시스템의 요구 $Es/N_0$ 및 out-of-band의 PSD 열화 정도를 분석하였다. Hamming windowing을 적용한 경우, PAPR 4㏈에서 clipping에 비해 요구 $Es/N_0$는 비슷한 열화정도가 나타났으나, out-of-band의 PSD는 5dB 정도 개선되는 성능을 보였다.

• MALSORI
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• no.56
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• pp.225-235
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• 2005

Speech unit concatenation with a large database is presently the most popular method for speech synthesis. In this approach, the mismatches at the unit boundaries are unavoidable and become one of the reasons for quality degradation. This paper proposes an algorithm to reduce undesired discontinuities between the subsequent units. Optimal matching points are calculated in two steps. Firstly, the fullback-Leibler distance measurement is utilized for the spectral matching, then the unit sliding and the overlap windowing are used for the waveform matching. The proposed algorithm is implemented for the corpus-based unit concatenating Korean text-to-speech system that has an automatically labeled database. Experimental results show that our algorithm is fairly better than the raw concatenation or the overlap smoothing method.