• 대한기계학회:학술대회논문집
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• 대한기계학회 2001년도 춘계학술대회논문집C
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• pp.451-456
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• 2001

Today, most of data storage devices use digital storage type. In this thesis, a new digital storage media called rainbow disk was introduced. It doesn't use 1-bit digital signal, but 2 or 4 bits digital signal using colors, so it can increase $2{\sim}4$ times more capacity than existing digital media in case of having the same spot size. It has made possible by means of technological advancement of devices and software. The photo quality paper was used for writing data by color inkjet or laser printing, and high resolution scanner was used for reading data. To extract data from image, the converting program was used. This paper shows the concept of rainbow disk as well as its performance and capacity. Axiomatic design was used for evaluating and developing the whole system.

• ETRI Journal
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• 제41권1호
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• pp.42-51
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• 2019

The rainbow hologram provides views of reconstruction with rainbow color within a large viewing zone. In our recent paper, a Fourier rainbow holographic display using diffraction grating and a white-light LED source was introduced. In this technique, the rainbow effect is realized by the dispersion of white-light source on diffraction grating, while the slit is implemented numerically by reducing the demands of the space-bandwidth product of the display. This paper presents a novel analysis on the visual perception of the Fourier rainbow holographic display using Wigner distribution. The view-dependent appearance of the image, including multispectral field of view and viewing zone, is investigated considering the observer and the display parameters. The resolution of the holographic view is also investigated. For this, a new quantitative assessment for image blur is introduced using Wigner distribution analysis. The analysis is supported with numerical simulations and experimentally captured optical reconstructions for the holograms of the computer model and real object generated with different slit size, reconstruction distance, and different observation conditions.

• Fisheries and Aquatic Sciences
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• 제1권1호
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• pp.24-29
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• 1998

Effect of extracellular calcium in vitellogenin (VTG) production in response to estradiol-17 $\beta$ $(E_2,\;2\times10^{-6}M)$ was examined in primary hepatocyte culture of rainbow trout, Onchorhynchus mykiss. Total calcium in estrogenized sera significantly increased, compared with the control, while diffusible calcium was insignificant. However, diffusible calcium in the incubation medium with $E_2$ was significantly reduced, compared with the control. The uptake of extracellular calcium by cultured hepatocytes signifIcantly increased 90 min after $E_2$ addition. Moreover, the accumulation of intracellular calcium increased in the cultures with $E_2$, regardless of the calcium concentrations in the incubation media. In addition, $E_2-primed $ VTG production was significantly decreased by withdrawal of E_2$ from the incubation medium. Moreover, VTG production by $E_2-primed$ hepatocytes was reduced by removing calcium from the incubation medium with or without $E_2$. These results suggest that the entry of extracellular calcium into the cytoplasm is an important step for VTG production in primary hepatocyte cultures in rainbow trout.

• Fisheries and Aquatic Sciences
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• 제4권4호
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• pp.186-191
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• 2001

Vitellogenin (VTG) and VTG mRNA induction by $estradiol-17\beta\;(E_2)$ were examined in the primary cultures of hepatocyte in the rainbow trout. Hepatocytes were precultured for 2 days, then $E_2$ was added and cultured for another 5 days. Media and hepatocytes were then analyzed by electrophoresis and Northern blotting for VTG and VTG mRNA, respectively. The hepatocytes were formed a few aggregates within 5 days without further spreading to a monolayer. Cell viability and high DNA content were maintained during the incubation. The hepatocyte culture with E2 induced a weak VTG band at a molecular weight of 175kDa on Day 2 after $E_2$ addition. The relative amount of VTG was expressed in percentage of total protein concentrations. VTG was gradually increased as $1.9\%$ on Day 2, $6.3\%$ on Day 4 and $7.3\%$ on Day 5. VTG mRNA band was detected at about 6.6 kb in the culture with $E_2$ at day 1 of culture. The level of VTG mRNA expression linearly increased with time until Day 5 (r=0.97).

• 한국환경과학회:학술대회논문집
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• 한국환경과학회 2003년도 International Symposium on Clean Environment
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• pp.159-164
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• 2003

Effects of Al on vitellogenin (VTG) and VTG mRNA induction by estradiol-17 $\beta$($E_2$) were examined in primary hepatocyte culture of rainbow trout. Hepatocytes were precultured for 2 days and then E2 ($2{\times}10^{-6}$M) and Al ($10^{-6}-10^{-4}$M) were simultaneously added to the incubation medium. Hepatocytes were cultured for 5 more days. Media and hepatocytes were then analyzed by SDS-PAGE and Northern blotting for VTG and VTG mRNA, respectively. These metal had no appreciable effect on the viability of hepatocytes in culture. However, Al interfered with VTG production and VTG mRNA expression. Al reduced VTG production in a concentration-dependent way and a significant reduction accurred at Al concentrations greater than $5{\times}10^{-5}$M. VTG mRNA expression also decreased with a negative correlation with Al concentration (r＝-0.98). These results suggest that Al inhibit VTG production at the transcriptional level to reduce VTG mRNA expression.

• Journal of Microbiology
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• 제33권4호
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• pp.273-277
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• 1995

Although trout farming is well established in Korea, very little information is available on the composition of intestinal microflora in rainbow trout (Salmo gairdnerii). In 1994, from October through November, we investigated the composition and succession of intestinal bacteria. As fish grew, total viable counts increased dramatically until 45 days after fertilization when anaerobes started to appear on the media. After this time, they increased steadily. Ten aerobic generic were identified and Gram negative bacteria constituted 85% of total isolates. Among these, Pseudomonas, Eikenella, and Alcaligenes were the three major genera. Six anaerobic genera were isolated and identified. The ratio of anaerobes to aerobes was about 1 : 1 in adult trout and the composition of genera was changed under different conditions.

• 한국인쇄학회지
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• 제25권1호
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• pp.81-94
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• 2007

Recently, the trend in the printing industry includes shorter run lengths and with fast turnaround times. As new markets have made it possible to produce small quantities of high-quality color products at affordable price, the general commercial printing meets the customer's diverse demand by using spot color besides process four colors. Especially, by using spot color for printing the enterprise's logo or specific color, we can see the effect of printing is getting better. With the combination of the right software, ink, media, and device can be treated as a digital proofer for spot color printing, providing significant time and cost savings compared to conventional procedures. The objective of this study is to investigate the quality of spot color proofs printed by ink-jet and dye sublimation proofer using ICC-based color management system. An Epson Stylus Color 3000 ink-jet proofer combined with Best Color Proof XXL RIP was tested for glossy and matte paper. 3M Rainbow dye sublimation proofer was examined using 3M Rainbow controller ver. 4.1 RIP on the manufacturer recommended proofing paper. ICC profiles were generated for each device using ECI 2002 visual target and evaluated for the accuracy of process 4 color reproduction. The test charts consisting of Pantone color 1140 was selected to test the quality of spot color reproduction.

• 방송공학회논문지
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• 제14권6호
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• pp.742-748
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• 2009

대부분의 상업적 디지털카메라들은 가격과 크기를 줄이기 위해서 Color Filter Array (CFA)를 사용한다. CFA를 통과한 이미지는 픽셀 당 오직 단일 칼라정보만 가지고 있기 때문에, 정보를 잃어버린 나머지 2개의 색 정보를 얻기 위해서 보간을 해야하는데 이 과정을 디모자이킹 (Demosaicing) 이라고 부른다. 수 많은 디모자이킹 알고리듬 방법들이 제안되어 왔음에도 불구하고, 여전히 무지개 형태의 에러 (rainbow artifact) 와 지퍼 모양의 에러 (zippering artifact) 의 문제를 가지고 있다. 본 논문에서는 향상된 가중치 함수를 이용하여 주변 픽셀값들의 경향성을 이용한 디모자이킹 알고리듬 방법을 제안한다. 실험결과, 우리가 제안한 알고리듬은 주관적 화질뿐만 아니라 객관적 화질에서도 기존의 방법들보다 뛰어다나는 것을 보여준다.

• 한국양식학회지
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• 제11권3호
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• pp.311-317
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• 1998

Estradiol-17${\beta}$($E_2$)에 의한 Vitellogenin (VTG) 함성에 미치는 Cu 및 Zn의 영향을 무지개송어의 배양 간세포를 이용하여 조사하였다. 간세포는 2일간 배양 한 후, E하(2) ($2{\times}10^6$ M)와 동시에 Cu ($2{\times}10^{-5}$~$10^{-4}$M) 또는 Zn ($10^{-5}$~$10^{-3}$M)을 배양액에 첨가하여 5일간 배양하였다. VTG 합성률은 총 단백질에 대한 VTG의 배율로 나타내었다. CU 및 Zn의 첨가는 배양 간세포의 생존율에는 영향을 미치지 않았다. 그러나, Cu의 첨가에 사용된 모든 농도에서, Zn의 첨가에는 농도 의존적으로 감소하여(10^{-3}$M에서 유의하게 감소하였다. 이러한 감소는, Zn의 제거시에는 회복되었으나, Cu에서는 회복되지 않았다. 그리고, Cu (10^{-4}$M의 첨가 시에 Ca (1.8 mM) 농도를 2.5 및 5.0 mM로 증가시켜도 Cu의 작용을 저해하지 못하였다. 이러한 결과로 보아, Cu 및 Zn은 간세포에서 합성되는 다른 단백질 보다 VTG 합성에 더 깊이 관여하는 것으로 추정된다.

• 한국융합학회논문지
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• 제11권7호
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• pp.89-95
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• 2020

디지털 미디어 환경에서 정부기관의 커뮤니케이션은 빠르게 변화해 가고 전문성도 강화되고 있음에도, 이들 성과에 대해서는 부정적 시각이 여전히 남아있다. 명확한 근거에 따른 이성적 평가가 아닌, 선입견에 의한 비판은 오히려 공공커뮤니케이션의 발전을 저해할 수 있다. 이에 본 연구는 정부기관 공공 커뮤니케이션 성과 평가에 있어 확증편향이 존재하는지 파악하고 이에 대한 대안을 제시하는 것을 목적으로 하였다. 이를 위하여, 본 연구는 동시적 환경과 순차적 환경 비교를 위하여 일반인 1000명을 대상으로 설문조사를 실시하였고, 연구결과 민간 광고/PR 대비 공공 광고/PR의 성과가 부족하다는 평가에는 확증편향의 가능성이 있음을 확인하였다. 본 연구결과는 공공 커뮤니케이션에 대한 이성적 비판과 평가 방안을 제시하여, 공공 가치 공유와 확장을 위해 기여할 수 있으리라 기대한다.