• 상하수도학회지
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• 제22권6호
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• pp.697-704
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• 2008

Stormwater runoff from urban road area as non-point source has a tendency of including lots of pollutants at initial rain period. Recently, there are several cases of having installed treatment facilities for reducing pollution discharge from the impervious cover in urban area to prevent watershed environment from getting worse. The filtration type among non-point source treatment systems has been known as one of the most efficient system for treatment of non-point source pollutants. Therefore, various kinds of filter media such as expanded polypropylene(EPP), granular activated carbon, zeolite, perlite, illite, sand, gravel has been developed. This study was conducted to verify performance and hydraulic characteristics of filter media as measures for non-point source. The experiment was carried out to evaluate applicability and variation of 4 kind of most popular filter media(EPP, GAC, Zeolite, Perlite) in headloss with elapsed time and influent flow rate and to obtain data base that could be used to establish management plan for road runoff treatment. In experiment by tap water, it showed that EPP and perlite those are floatable materials showed stable operating performance and lower headloss than the others.

• 상하수도학회지
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• 제13권3호
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• pp.61-72
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• 1999

To obtain the experimental data for design and operation of actual filtration processes, a sand filter and three kinds of dual media filters in pilot-plant scale were operated in this study. We analyzed the effect of filter medium composition on the filter performance and the effects of backwash water flow rates, length of stream line and air flow rate on the filter backwash efficiency. We also compared the efficiencies of the combined air-water backwashing and the water backwashing in dual media filters. As the backwash water flow rates or the length of stream line increased, the final turbidity of backwash water was decreased and the filtration duration time after backwash was increased. In the case of the combined air-water backwashing, the backwash water quantity needed for backwashing the dual media filters could be decreased. The total volume of filtered water for the dual media filters during filter run was over three times larger than that for the sand filter. The dual media filters could be operated at a high filtration rate of 360 m/day.

• 화훼연구
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• 제18권3호
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• pp.171-178
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• 2010

수출용 접목선인장 '황월'의 기존에 사용되는 배지인 피트모스 보다 가격이 낮으며, 생육이 피트모스와 비슷한 배지를 선발하고자 7가지 종류 배지 (피트모스, 배양토 BM6, 코코피트, 하이드로크레이, 하이드로볼, 휴가토, 버미큘라이트)에 재배하여 배지의 이화학적 성분과 생육변화를 조사하였다. 배지의 이화학적 분석결과로는 코코피트가 식재 90일 후에도 이화학적 성분의 변화가 거의 없어 안정적이었으며, 하이드로볼이 보수력이 높은 것으로 조사되었다. 수출용 접목선인장 '황월'의 생육조사 결과 유기질 배지에서 대조구인 피트모스와 비슷한 생육을 보인 배지는 코코피트 였으며, 무기질 배지에서는 휴가토, 버미큘라이트, 하이드로클레이가 대체적으로 양호한 생육을 보였다. 그러나 무기질 배지는 무게가 가벼워 식물식재 후 이동 시 쓰러지는 단점이 있었다. 피트모스와 비슷한 생육조건과 낮은 가격을 가진 배지로는 유기질 배지인 코코피트와 수태를 감싸지 않고 사용할 수 있는 무기질 배지인 무게가 상대적으로 무겁고 값이 낮으며 국내 생산이 되는 하이드로볼이 수출용 선인장 재배 배지로 적합할 것으로 판단되었다.

• 생명과학회지
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• 제12권6호
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• pp.740-744
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• 2002

배지의 물리성이 몇 가지 나리 품종 자구의 기내 증식과 증식된 자구의 순화에 미치는 영향을 구명하기 위해 수행되었다. 기내 인편배양과 자구배양에 의한 자구의 증식은 Oriental hybrid ‘Marco Polo’, ‘Casa Blanca’와 Asiatic hybrid ‘Jolanda’ 세 품종 모두 액체배지보다 고체배지에서 자구로부터 자구를 증식시켰을 때 형성된 자구의 수와 생장이 가장 양호하였다. 기외 순화단계에서는 모든 실험구에서 전배양이 고체배지였던 실험구가 생존율과 맹아율이 가장 높았으며, 특히 전배양에서 자구를 실험재료로 이용했던 실험구가 인편을 이용하였던 것보다 맹아율이 다소 양호하였다.

• 대한기계학회논문집A
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• 제28권7호
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• pp.877-884
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• 2004

In this paper, structural analysis is performed to investigate the deformation of porous media in a proton exchange membrane fuel cell (PEMFC). Structural deformation of air plate of the fuel cell causes the change in configuration and cross sectional area of the channel. The distributions of mass flow rate and pressure are major factors to decide the performance of a PEMFC. These factors are affected by channel configuration of air plate. Two kinds of numerical air plate models are suggested for flow analyses. Deformed porous media and undeformed porous media are considered for the two models. The Numerical flow analysis results between deformed porous media and undeformed porous media have some discrepancy in pressure distribution. The pressure and velocity distribution under a working condition are numerically calculated to predict the performance of the air plates. Pressure and velocity distributions are compared for two models. It is shown that structural deformation makes difference in flow analysis results.

• 반도체디스플레이기술학회지
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• 제21권2호
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• pp.127-132
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• 2022

In the era of COVID-19 pandemic, COVID related keywords, news and SNS data are pouring out. With the help of the data and LDA topic modeling, we can check out what media reports about COVID-19 and vaccines. Also, we can be clear how the public reacts to the vaccine on social media and how this is related with the increasing number of COVID-19 patients. By using sentimental analysis methodology, we can get to know about the different kinds of reports that Korea media send out and get to know what kind of emotions that each media company uses in majority. Through this procedure, we can know the difference between the Korean media and the foreign ones. Ultimately, we can find and analyze the keyword that suddenly rose during the COVID-19 period throughout this research.

• 한국멀티미디어학회논문지
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• 제19권7호
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• pp.1216-1224
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• 2016

This study analyzed the montage pattern of e-book in a bid to include e-book in the film language system. To this end, this study targeted three pieces of e-books which reproduced the animation for theater use of Disney Company. This study did research on characteristics of montage in films, and kinds of film vectors, and defined it as 'Montage of Experience' according to media characteristics of e-book. This study deducted the montage pattern of 3 sorts of classification, and 10 sorts of detailed classification by doing research on the analysis object. This study has a significance in that it pioneers a new perspective in e-book research which has been biased towards a functional perspective. Analysis of the point of contact where the existing visual media, and new media meet with each other could be a driving force promoting the growth of the relevant industry, and this study thinks that the analysis of the point of contact is the research which is helpful to working out qualitative improvement of e-book contents.

• 한국멀티미디어학회논문지
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• 제21권1호
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• pp.1-9
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• 2018

Much research has been conducted to judge aesthetic value for a single type of stimuli, but research to determine aesthetic value when two kinds of stimuli are presented at the same time is not explored in depth. In this paper, we measure the difference between the presentation of visual stimuli like general image and the presentation of signboard image including text stimuli using EEG. In the experiment, two oddball tasks were performed for general images and signboard images, and EEG changes according to the aesthetic value of the images were measured. As a result, the change of ERP in signboard image was larger than that of general image. We confirmed that more visual information was received and processed when two stimuli were presented at the same time.

• International Journal of Industrial Entomology and Biomaterials
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• 제41권2호
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• pp.28-35
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• 2020

Entomopathogenic Beauveria bassiana and Metarhizium anisopliae are well-known biological control agents worldwide, and have high potential in industrialization. However, their thermo-susceptibility limits long-term storage under high temperature conditions and insecticidal activity after application in target pests. The virulences of M. anisopliae JEF-003 and JEF-004, and B. bassiana JEF-006 and JEF-007 against bean bug (Riptortus pedestris), and the thermotolerance of conidia produced on three kinds of grains, sorghum, millet and Italian millet as substrates for solid cultures were investigated. Of the three grains, Italian millet was the suitable grains in the production of thermotolerant conidia, and a significant relationship between conidial thermotolerance and the media was demonstrated. This work suggests that biological characteristics of entomopathogenic fungi are altered by culture media, and these results will be a chance to understand the factors in the media which make such changes.

• 한국실내디자인학회논문집
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• 제28호
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• pp.11-16
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• 2001

All vague and constructions of contemporary cultural environment have been reorganized and the relationship between people and culture can't follow development speed of rapid material civilization development and being informationalized. Because of the circumstances, physical environment is changing into other cultural environment, existence of human being is at a crisis. Physical value precedes mental value and rapid changing causes culture lag. Modernism design of 20th century suggested standard, simplicity and mass production methods, but nowaday, as human being complexity is increasing, information-media are needed to satisfy that. Namely usual design thoughts have to be changed because our life is surrounded by many kinds of powerful media sings and various mixed cultural circumstances. People predict that the characteristics of new ages are 'Immateriality', 'Sensoriality', 'multimedia'. Amongst them, medial spatial characteristics will be eventually remarkable in commercial space which is coincided with economic logic and multilateral culture. This study is a focus on commercial space which emphasis contemporary medial characteristics and observes medial meaning and various technique through some experimental works in Korea. Also this study's purpose is to examine design directions which correspond with contemporary Korea culture.