• 한국미생물·생명공학회지
• /
• 제22권2호
• /
• pp.210-216
• /
• 1994

Phage utilizing medium and BL agar supplemented with antibiotic Tc(tetracycline) were developed as selective media for the isolation and counting of bifidobacteria in dairy products. The former was based on the host specificity of phage. When bifidobacteria and Lactobacillus casei HY 2782 were mixed together in dairy product, L. casei HY 2782 was laysed by J1 phage which has host specificity to L. casei HY 2782 whereas bifidobacteria grew well on the selective medium added wIth J1 phage. The latter was found to inhibit the growth of S. salivarius subsp. thermophilus, L. acidophilus, and L. casei, but commercial bifidobacteria grew well in Tc-containing BL agar.

• The Korean Journal of Ceramics
• /
• 제4권4호
• /
• pp.292-296
• /
• 1998

In wet powder processing of alumina, a number of organic molecules such as dispersant and binder are used to produce the flow behavior and properties requisite for shape forming. In this study, interparticle forces of alumina particles suspended in aqueous media were controlled by suspension pH, poly (methacrylic acid) (PMAA, used as dispersant) and poly (vinyl alcohol) (PVA, used as binder). The combined adsorption isotherms of the dispersant and binder additives on alumina were determined by total organic carbon analyzer, while the adsorption of dispersant was differentiated from binder in the mixed additive system by ultraviolet spectroscopy. The electrokinetic behavior of alumina suspensions were then correlated with the adsorption characteristics of dispersant and binder onto alumina particles. It was found that the isoelectric ($pH_{iep}$) of alumina shifted from pH 8.9${\pm}$0.1 to acidic pH as PMAA concentration increased, while PVA adsorption did not affect the $pH_{iep}$ but caused a decrease in the near surface potential.

• 스마트미디어저널
• /
• 제11권6호
• /
• pp.30-36
• /
• 2022

본 논문은 원격협업 시스템에서 시각적 의사소통 도구인 눈 시점 포인터 공유의 장점을 알아보았다. 특히 원격 협력자의 손동작이 가상 손으로 공유될 때, 추가로 공유된 원격 협력자의 시점 포인터가 미치는 영향을 조사하였다. 24명의 피실험자가 참여한 사용자 실험에서, 추가된 원격 협력자의 눈 시점 포인터는 현지 협력자와 원격 협력자 모두의 작업 부하를 줄여주었으며 두 협력자 간 co-presence를 높여주었다.

• 한국정보과학회논문지:정보통신
• /
• 제27권2호
• /
• pp.123-130
• /
• 2000

멀티미디어 동기화의 주요 관심은 미디어내 동기화에서의 지터와 미디어간 동기화에서의 스큐를 어떻게 해결하는 것인가이다. 멀티미디어 응용 소프트웨어를 효과적으로 개발하기 위해서 시간적 미디어와 공간적 미디어를 혼합하여 표현할 수 있는 멀티미디어 동기화 모델을 제안한다. 제안한 논문은 미디어간 동기화에 대한 QoS 처리를 위하여 네가지 파라미터를 이용하였고, 상대적인 지속시간 알고리즘과 지터 보상시간 알고리즘을 제시하였다. 그리고 키 매체가 손상이 되었을 때 키 매체의 최대 지연 지터 값만큼 기다림으로써 키 매체 이외의 매체에 최대 지연 지터 값만큼 추가적으로 재생할 수 있도록 하였다. 최대 지연 지터 값의 적용은 서비스 품질을 향상시키는 결과를 가져왔다.

• 한국환경과학회지
• /
• 제5권1호
• /
• pp.61-69
• /
• 1996

The combined wastewater of municipal landfill leachate and municipal sewage was treated using several sets of bench-scale aerated circulating system including porous media. Investigated items in this experiment were the dominant protozoa and metazoa in this system, the variation of microfauna relationship between operating condition and dominant genera. Also considered the factors determining dominant genera and their role. The outcome of this research is as follows; 1. Aspidisca, Vorticella, Truhellophyllum, Lecane, Philodina, Cyclops were mainly appeared prior to combinding leachate, while Trachelocerca, Bodo, Glaucoma were the dominant genera after combinding leachate. 2. As to metazoa, Nematode and Philodina were not influenced by 5oA leachate mixing ratio, meanwhile Crustacea has high sensitivity for increased leachate mixing ratio and it was not appeared in 5% leachate mixing ratio. 3. The appropriate treatability could'nt be expected at the above 10% leachate mixing ratio. Especially, in the condition of 20% leachate mixing ratio, all of the microfauna were affected damage seriously on their existence. Meanwhile hydraulic retention time, substrate loading rate and slut자e production rate didn't give notable influence on increasing the number of microfauna. 4. As to protozoa, saprozoic and holozoic species were appeared commonly and polysaprobic species were dominent. 5. Filamentous organsms were nearly not affected by leachate mixing. It seems that they could live without any trouble at the 10% leachate mixing ratio, if the substrate is sufficient. 6. Diversity of microfauna had a reducing trernd as the sewage was mixed with leachate.

• 한국환경복원기술학회지
• /
• 제5권4호
• /
• pp.70-79
• /
• 2002

This study was conducted to develop environmental restoration methods for the ecological restoration of the rock exposed steep cut-slopes using native woody plants seeds by the hydro-seeding with artificial soil media. The main results are summarized as follows; 1. Quercus spp. seeded after seed treatment germinated over 80% and most of them grew well until one year. So, Quercus spp. can grow at the extremely dry rock exposed slopes revegetated by hydro-seeding with soil-fertilizer-seed mixed media. 2. The germinated seedlings grew well at the slopes oriented southeast. But in case of the survival ratio of the germinated seedlings, northwestward slopes was the best. 3. In case of the using pot seedlings of the Miscanthus sinensis var. purpurascens, it shows more beautiful scenery than the area using cool-season grasses. 4. As the results of the experiment, Albizzia julibrissin, Quercus spp. and Lespedeza crytobotrya can be useful at the restoration and revegatation of the cut-slopes. 5. At the results of the seed mixture experiment, cool-season grasses covered the ground quickly, but slowly germinated Quercus spp. and Lespedeza crytobotrya formed under story vegetation. Also, Albizzia julibrissin formed upper story vegetation will be replaced by Quercus spp. slowly.

• 한국조경학회지
• /
• 제26권3호
• /
• pp.312-320
• /
• 1998

The purpose of this study is to investigate and compare the validity of various visual simulation methods with or without sounds and videos of the landscapes The landscape evaluation through such media as color slide, color slide with sounds, video and video without sounds are compared with on-site evaluaton of the landscape. The results are as follows : ·Video can generally convey the feelings for the real landscapes better than traditonal mathod, i.e., slide without sounds. ·When the sources of sounds are dominant in the view, there are great differences in responses among 4 different media and video can convey the feelings for real landscapes on site most successfully. ·There are slight differences by landscape types ; in mixed landscapes, there are higher correlations between the on-site estimaton and estimations through media ; in natural landscapes, video can reflect the feelings for real landscapes on site better. ·There is little difference between two shooting methods, fixed shot and pan shot. These results suggest that traditional visual simulation, with slides or photographs, could not reflect the real landscapes in certain situations and the visual simulation method with sounds and videos should be used in such situatios to represent the real landscape better. Especially, when the whole and comprehensive evaluatio of the landscape properties is important, the visual simulation with sounds and videos should be used. And simulation techniques with sounds and videos should be further developed for practial applications.

• Journal of Information Science Theory and Practice
• /
• 제8권1호
• /
• pp.20-32
• /
• 2020

Informational urbanism is a new research area in information science. In this study, art history joins informational urbanism: Are digital artworks in public urban spaces recognized as essential assets of a smart city? We employed case study research, working with the example of the huge digital media façade of the Arthouse Graz as an artwork in a public space. In a mixed-methods approach, we asked passers-by and interviewed experts on Graz as a smart city and on the Arthouse's role concerning the image of Graz as a smart city. The research found strong hints that indeed digital artworks with large screens or media façades at public spaces are parts of a city's weak location factors as well as of the city's urban structure and may symbolize the city's smartness. A practical implication of this finding is that artists, computer and information scientists, city planners, and architects should include interactive contemporary digital art into city spaces in order to demonstrate the city's way towards knowledge society.

• Journal of applied mathematics & informatics
• /
• 제7권3호
• /
• pp.773-785
• /
• 2000

In this paper an algorithm is presented based on the additive Schwarz method for steady groundwater flow in a porous medium. The subproblems in the algorithm correspond to the problem on a coarse grid and some overlapping subdomains. It will be shown that the rate of convergence is independent of the mesh parameters and discontinuities of the coefficients, and depends on the overlap ratio.

• 한국유기농업학회지
• /
• 제27권3호
• /
• pp.341-351
• /
• 2019

본 연구는 2018년 충북 괴산군 유기농업연구소에서 노지재배의 단점을 보완할 수 있는 수경재배 기술의 일환으로 명월초 유기 수경재배 시 천연배지 종류가 생육에 미치는 영향을 조사하여 최적의 천연배지를 선발하고자 수행하였다. 실험에 사용한 유기양액은 생육증 진용 유기농자재로 등록된 시판자재 34종을 성분 분석한 후 2종을 혼합하여 사용하였으며, pH 5.5~6.5, EC 0.5~1.0 ds/m로 5월 20일부터 1일 1회, 회 당 50 L씩 점적관수(Ø13 mm, Nam Kyung Co.)를 이용하여 처리하였다. 명월초 정식 후 5월~6월 중순까지 배지별 근권의 최저 온도는 코코피트가 포함된 배지의 최저온도가 다른 배지에 비해 높은 경향을 나타내었으며, 상대적으로 펄라이트가 포함된 배지의 최저온도가 다른 배지에 비해 낮은 경향을 나타내었다. 혼합배지를 제외한 단용 배지별 최저온도는 코코피트 배지가 가장 높게 나타났으며, 그 다음이 버미큘라이트 배지, 펄라이트 배지가 가장 낮게 나타났다. 명월초 정식 후 50일의 천연배지 조성에 따른 초기 생육특성(초장, 엽수, 엽장, 엽폭)은 버미큘라이트 배지에서 가장 우수하게 나타났다. 천연배지 조성별 명월초 수량은 버미큘라이트 배지와 코코피트 : 버미큘라이트 : 펄라이트(2:1:1) 혼합배지가 가장 우수하게 나타났다. 주요 항산화 성분인 총 폴리페놀의 함량은 버미큘라이트 배지에서 1.45 mg g^-1으로 가장 높게 나타났다. 따라서, 천연배지 조성에 따른 명월초 생육, 수량 및 총 폴리페놀 함량 등을 비교했을 때 버미큘라이트 단용 배지가 유기 수경재배 시 천연배지로 적합할 것으로 판단된다.