• 한국한의학연구원논문집
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• 제8권2호통권9호
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• pp.121-124
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• 2002

To obtain a specific pharmacological effect, herbal medicines are i)recessed based on the principle of traditional korean medicines. However, the problem in processing is the variety of methods, technics, and drug quality. In order to establish the base of standardization of processing methods, some herbal medicines were processed and studied the change of a color tone before and after processing.

• 한국전자파학회논문지
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• 제11권8호
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• pp.1407-1413
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• 2000

본 논문에서는 기지국용 전력 증폭기의 혼 변조 성분들을 극도로 억압하기 위해서 Error feedback 방식을 사용한 Feedforward 선형 전력 증폭기를 설계하였다. 특히, 제안된 선형 전력 증폭기는 기존의 피드백 기술의 단점인 증폭 이득의 손실을 없앤 Error feedback 기술과 Feedforward 기술을 혼합하여 적용하였다. 제안된 선형 전력 증폭기는 HP사의 EEsof ADS ver.1.3을 사용해서 설계.제작하였다. 측정결과, 이득 28 ㏈, P1㏈ 31 ㏈m인 주 전력 증폭기에 -7 ㏈m/tone을 갖는 1850 MHz와 1851.25 MHz의 2-tone 신호를 인가한 결과 전체 IMD가 약 35 ㏈ 개선되었다.

• 한국한의학연구원논문집
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• 제8권1호
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• pp.105-108
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• 2002

To obtain a specific pharamcological effect, herbal medicines are processed based on the principle of traditional korean medicines. The problem in drug processing is the variety of methods, technics, and drug quality. In order to establish the base of standardization of processing methods, some herbal medicines(Evodiae Fructus, Scutellariae Radix, Astragali Radix, Zingiberis Rhizoma, Dioscoreae Radix, Aconiti Radix) were processed and studied the change a color tone of processed and unprocessed herbal medicines. The color tone(value and chroma) of these herbal medicines were changed after processing.

• 한국방송∙미디어공학회:학술대회논문집
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• 한국방송∙미디어공학회 2016년도 하계학술대회
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• pp.260-263
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• 2016

Recently high dynamic range imaging technique is hot issue in computer graphic area. We present a progressive tone mapping algorithm, which is based on weighted least squares optimization framework. Our approach combines weighted leastsquaresfiltering with iCAM06, for showing more perceptual high dynamic range images in conventional display, while avoiding visual halo artifacts. We decompose high dynamic range image into base layer and detail layer. The base layer has large scale variation, it is obtained by using weighted least squares filtering, and then the base layer incorporates iCAM06 model. Then, adaptive compression on the base layer according to human visual system. Only the base layer reduces contrast, and preserving detail. The resultshows more perceptual color appearance and preserve fine detail, while avoiding common artifacts.

• 한국방송∙미디어공학회:학술대회논문집
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• 한국방송∙미디어공학회 2018년도 하계학술대회
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• pp.59-62
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• 2018

In this paper, we propose a contrast enhancement algorithm using guided image filter (GIF). The GIF is used to divide an HDR image into a base layer and a detail layer. The energy scale of base layer determinate the darkness and brightness of the image. However, the detail information in the base layer is difficult to be displayed because of the high brightness and clusters of low brightness. We propose a contrast enhancement method by adjusting the gray level of base layer by subtracting the mean value of itself. It is combined with the detail layer to preserve the detail information. Experiment results show that the proposed algorithm has better performance in detail preservation and contrast enhancement.

• 대한전자공학회논문지SD
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• 제38권2호
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• pp.128-136
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• 2001

본 논문은 주파수 천이를 적용시킨 광무선(fiber-radio)시스템의 광링크부에 대한 성능분석을 한다. 제시된 광링크부는 CS(control station)에서 얻어진 밀리미터파 대역 광파일럿톤(optical pilot tone)이 하향링크뿐 아니라 상향링크에도 공급되도록 하여 BS(base station)의 구조를 간단히 하였다. 광파일럿톤을 얻기 위해 CS의 EOM(electro-optic modulator)을 MAB(maximum bias), MIB(minimum bias), QB(quadrature bias)로 바이어스를 달리할 수 있으며 각각의 경우에 따라 링크의 성능을 분석한다. 분석은 레이저 광원의 전력이 일정한 경우와 PD(photo detector)에 수신되는 광 DC 전력이 일정한 경우에 대해서 행하여지며 각 경우에 대해서 최적의 하향링크 CNR 및 상향링크 SFDR(spurious free dynamic range)을 얻기 위해 효과적인 바이어스 방식을 제시한다

• 한국전자파학회논문지
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• 제11권1호
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• pp.116-123
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• 2000

본 논문에서는 Delay line이 없는 Feedforward loop를 이용한 PCS 중계기용 선형화기룹 설계 및 제작하였다. 기존의 Feedforward 방식을 이용한 Predistortor에서 사용되는 지연 선로(Delay line)를 제거하기 위하여 기존의 선호 루프(Signal loop)의 주 경로에 보조 증폭기를 사용하고 보조 경로에 보조 증폭기와 비슷한 동작시간을 갖 는 혼 변조 증폭기(Inter-modulation am미ifier)를 사용하였다 또한, 주 증폭기를 에러 루프(Error loop)로 옮기 고 그와 비슷한 농작시간을 갖고 에러 선호를 증폭하기 위해서 에러 증폭기(Error amplifier)를 사용하여 지연 선로를 제거하였고 에러 선호를 주 증폭기 출력 단에 인가시켰다, 본 논문의 선형화기는 HP사의 EEsof ADS v ver.l.l을 사용해서 설계하였으며 유전율 3.2 .. 2 두께 0.8mm인 GML 1000 기판에 제작하였다. 측정 결과, 이득 27 d dB이고 $P_{1dB}$ 29 dBm인 주 전력 증폭기에 -7 dBm/tone을 갖는 1.85 GHz와 1.851 GHz의 2-tone 신호를 인가한 결과 전체 IMD가 약 17 dB 개선되었다.

• 대한본초학회지
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• 제37권2호
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• pp.23-31
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• 2022

Objectives : The purpose of this research was to find out the efficacy of Castanea crenata Inner Shell (CCIS) on the skin by comparing the difference effect between only MTS (microneedle therapy system) and the CCIS essence application after MTS treatment. Methods : The present author performed once a week and total 3 times of MTS treatment. The treatment time took about 5 ~ 10 minutes and the depth of the needle was adjusted according to the participant's skin condition. In the control group, essence base was applied after MTS and in the experimental group, CCIS powder dissolved essence was applied. One week after each treatment, the change of skin condition was measured. Two weeks after the end of the clinical trial, the skin condition was checked again. Results : In the case of the test group and the control group, there was a significant decrease in thermography temperature and there was a significant increase in skin tone. In the case of pores and pigmentation, there was no significant difference on both group. In the case of moisture, there was a significant increase only in the test group. Conclusion : The MTS treatment itself showed good effects on thermography temperature and skin tone. But in the case of the moisture effect, it was much better when the CCIS essence was applied to the skin after MTS treatment. This study suggests that CCIS essence increases the efficacy of MTS on the point of moisture.

• 한국의류학회지
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• 제16권2호
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• pp.255-262
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• 1992

A computer simulation methiod for costume design has been developed using LUMENA, a generic-purpose 2-dimensional graphic software. In this study the palette, tone chart, fabric chart, styling chart, and costume drawing were constructed on the computer. In costume design simulation, fabric swatches with various colors and patterns were applied to the base garment image taken by using a scanner or a video camera. In this procedure the original 3-dimensional effect was fully retained. Using this simulation method, a number of costume designs could be carried out in short time without actually making the garment. A portfolio including the tone chart, fabric chart, styling chart, costume drawing, and simulation results were made for the purpose of demonstration, using the animation tools of LUMENA.

• 한국멀티미디어학회논문지
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• 제22권1호
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• pp.10-17
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• 2019

In High Dynamic Range (HDR) image processing, tone mapping is the process to compress an input image into a Low Dynamic Range (LDR) image. In most cases, the reason that detail preservation is prior to take over tone mapping is that the dynamic range is significantly different between input and output images. In the case of iCAM06, details are separated by using a bilateral filter, however, it causes noise amplification at the dim surround region. Thus, we suggest that the detail signal, which is separated from the bilateral filter, is combined with the base signal after an adaptive Kalman filter is applied according to the local standard deviation. We confirmed that the proposed method enhances the HDR images quality by checking the noise reduction in a dim surround region.