• Proceedings of the KSRS Conference
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• 2007.10a
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• pp.526-529
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• 2007

Due to its inherent feature of high-resolution satellite, there is strong need in some specific area to minimize the processing time required to get a standard image on hand from downlink signal acquisition. However, in general image processing system, it takes considerable time to get image data up to certain level from raw data acquisition because the huge amount of data is dealt sequentially as input data. This paper introduces the high-speed image processing system which generates the image data only for the area selected by user. To achieve the high speed performance, this system includes Quick Look Image display function with sampling, ROI selection function, Image Line Index function, and Distributed processing function. The developed RPS was applied to KOMPSAT-2 320Mbps downlink channel and its effectiveness was successfully demonstrated. This feature to provide the image product very quickly is expected to promote the application of high resolution satellite image.

• Communications for Statistical Applications and Methods
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• v.8 no.1
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• pp.127-135
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• 2001

In this paper, we consider a simple method for testing the assumption of independent censoring on the basis of a Cox proportional hazards regression model with a time-dependent covariate. This method involves a two-stage sampling in which a random subset of censored observations is selected and followed-up until their true survival times are observed. Lee and Wolfe(1998) proposed an adjusted estimate of the survivor function for the dependent censoring under a proportional hazards alternative. This paper extends their result to obtain a bootstrap confidence interval for the adjusted survivor function under the dependent censoring. The proposed procedure is illustrated with an example of a clinical trial for lung cancer analysed in Lee and Wolfe(1998).

• Proceedings of the Korean Society of Broadcast Engineers Conference
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• 2012.11a
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• pp.29-30
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• 2012

본 논문은 고해상도의 깊이맵을 얻기 위해서 대응되는 색상 영상의 최대 변화도를 이용한 깊이맵 업샘플링 기술을 제안한다. 기존 알고리즘들이 인접한 화소의 깊이 값을 참조할 때 거리에 따른 가중치를 부여하는 것과 달리, 제안한 방법은 현재 화소와 참조 화소 사이의 최대 색차 변화도를 이용하여 가중치를 부여한다. 이런 접근 방법은 비슷한 색상의 물체가 서로 붙어 있거나 큰 크기의 객체가 존재할 경우에도 모두 올바른 가중치를 부여할 수 있다는 장점을 갖는다. 먼저, 색상 영상의 색차 성분에 대한 변화도 영상을 계산하고, 업샘플링하고자 하는 화소와 참조 화소 사이의 최단 경로 위에서 가장 큰 변화도를 취한다. 변화도가 클수록 다른 객체에 존재할 확률이 높기 때문에 변화도가 큰 참조 화소에는 작은 가중치를 부여하고, 이들의 가중합을 통해 최종 깊이 값을 계산한다. 제안한 방법을 이용하여 깊이맵을 업샘플링한 결과가 기존 알고리즘들에 비해 우수한 결과를 보였다.

• Proceedings of the Korean Society of Broadcast Engineers Conference
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• 2012.07a
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• pp.394-397
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• 2012

멀티미디어 장치와 사용자의 욕구가 다양해짐에 따라 이를 충족시키기 위하여 이미지 크기는 장치에서 지원하는 해상도나 사용자의 욕구에 맞게 조정되어야 한다. 이미지 업샘플링 방법은 크게 공간 도메인과 주파수 도메인에서 수행될 수 있다. 일반적으로 공간 도메인에서의 업샘플링 방법은 주파수 도메인의 업샘플링에 비해 상대적으로 주관적인 화질 측면에서 좋은 성능을 나타내지만 객관적인 성능이 낮다. 반대로 주파수 도메인에서의 업샘플링 방법은 객관적인 화질이 좋고 주관적인 화질 측면에서 상대적으로 성능이 낮게 나타난다. 본 논문에서는 공간 도메인과 주파수 도메인에서의 업샘플링 방법을 블록의 특성에 따라 적응적으로 업샘플링 방법을 선택하는 알고리듬을 제안한다. 제안하는 방법은 객관적 성능 뿐 아니라 주관적 성능까지도 향상 시킬 수 있다. 실험 결과를 통해 제안하는 알고리듬이 기존의 알고리듬에 비해 PSNR 측면에서 0.87dB~1.15dB 증가하고, 주관적 화질도 향상됨을 알 수 있다.

• Journal of Biomedical Engineering Research
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• v.8 no.2
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• pp.117-117
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• 1987

The medical image processing system is intended for a diverse set of users in the medical Imaging Parts. This system consists of a 640 Kbyte IBM-PC/AT with 30 Mbyte hard disk, special purpose image processor with video input devices and display monitor. Image may be recorded and processed in real time at sampling rate up to 10 MHz. This system provides a wide range of image enhancement processing facilities via a menu-driven software packages. These facilities include point by point processing, image averaging, convolution filter and subtraction.

• Proceedings of the Korean Institute of Building Construction Conference
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• 2005.11a
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• pp.149-155
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• 2005

Lately Construction industry depressed by hard construction market condition. So Construction company, especial at this time, make more rationalize the management of inside Company and Construction field. So in this study we are to present the method of calculation reasonable duration at Reinforced Concrete Work. For the study first make up a question at field workers, then sampling the Form workers based the question. Second, We are using Work Analysis Method analysing the worker's work-method and Time. And then using the result of analysis, measure the Productivity of Form work. The productivity of Form work is used the basic data of duration at Reinforced Concrete Work

• The Transactions of the Korean Institute of Electrical Engineers
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• v.34 no.9
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• pp.361-367
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• 1985

A new injection method is proposed for active power filters to eliminate AC harmonics in ac input current of nonlinear loads such as rectifiers. By injecting the PWM current determined by the proposed injection method, all the harmonics up to order nn can be eliminated to exactly zero. This PWM injection current can be generated by sampling total harmonic wave at the rate of M and the sampled values are converted into the proposed PWM wave with N pulse-width variables and adjustable current magnitude Im. These variables are deetermined by solving a set of N nonlinear harmonic equations and the harmonic-elimination characteristics of the new injection are investigated through digital computer sinmulation. Also by comparing between the simulated results and the ones synthesized by data stored in EPROM, the possibility of the suggested injection method can be shown.

• Proceedings of the KSR Conference
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• 2009.05a
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• pp.1020-1023
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• 2009

A purpose of this study measure the acceleration of operating KTX high speed train to find out something wrong to obtain reliable the acceleration measurement data. The existing measurement system come about a difference between measurement data of running off the track with the acceleration measurement data of operating KTX high speed train. Therefore, the measurement system needs make up for the weak points in the current system. This study analyze existing measurement system and the acceleration measurement data to introduce the synchronization of the existing measurement system and the acceleration measurement and will be reasonable to this sampling through field test.

• Journal of the Korean Institute of Telematics and Electronics A
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• v.31A no.6
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• pp.188-198
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• 1994

The distributed arithmetic approach has been commonly recognized as an efficient method to implement the inner-product type of computation with fixed coefficients such as DCT/IDCT. This paper presents a novel architecture and the implementation of 2-D DCT/IDCT VLSI chip based on distributed arithmetic. The main feature of the proposed architecture is a fully 2-bit serial pipeline and parallel structure with memory-based signal processing circuitry, which is efficient to the implementation of the bit-serial operation of distributed arithmetic. All modules of the proposed architecture are designed with NP-dynamic circuitry to reduce the power consumption and to increase the performance. This chip is applicable in HDTV systems working at video sampling rate up to 75 MHz.

• JSTS:Journal of Semiconductor Technology and Science
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• v.11 no.4
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• pp.256-261
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• 2011

We demonstrate 3-Gb/s wireless link using a 60-GHz receiver front-end fabricated in $0.25-{\mu}m$ SiGe:C bipolar complementary metal oxide semiconductor (BiCMOS) and a mixed-mode quadrature phase-shift keying (QPSK) demodulator fabricated in 60-nm CMOS. The 60-GHz receiver consists of a low-noise amplifier and a down-conversion mixer. It has the peak conversion gain of 16 dB at 62 GHz and the 3-dB intermediate-frequency bandwidth of 6 GHz. The demodulator using 1-bit sampling scheme can demodulate up to 4.8-Gb/s QPSK signals. We achieve successful transmission of 3-Gb/s data in 60 GHz through 2-m wireless link.