• The Journal of Information Technology and Database
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• v.1 no.1
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• pp.31-62
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• 1994

Information systems for application areas like office automation, customer service or computer aided manufacturing are usually highly interactive and deal with complex document structures composed of multiple media formats. For the realization of these systems, nonstandard database systems, which we call document databases, need to handle different types of coarse-and fine-grained document objects(like full-text documents, graphics and images), hierarchical and non-hierarchical relationships between objects(like composition-links and cross-references using hypertext structures) and document attributes of different types such as formatting/presentation information and access control. In this paper, we present the underlying data model for document databases based on descriptive markup languages that provide mechanisms for specifying the logical structure(or schema) of individual documents stored in the database. We then describe extensions to the data model for supporting notion of composite structures("join" operators for documents) --composition and hyperlinking mechanisms for representing compound documents and inter-linked documents as unique entites separate from their components. Furthermore, due to the interactive nature of the application domains, the database system in conjunction with clients(or browsers) has to support visual navigation and graphical query mechanisms. We describe the functionality of a new user interface paradigm called HyBrow for meeting the above mentioned requirements. The underlying implementation strategy is also discussed.discussed.

• KOREAN JOURNAL OF PACKAGING SCIENCE & TECHNOLOGY
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• v.30 no.1
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• pp.43-51
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• 2024

The addition of oxygen scavengers to food products helps to reduce oxygen exposure, thereby mitigating deterioration, including changes in taste, odor, and color, as well as inhibiting microbial growth. Despite the advantages of the existing non-metallic oxygen removal materials in terms of safety for the human body and suitability for use in microwave ovens, their utilization has been limited due to their slow reaction initiation speed. Therefore, in the current study, sodium metabisulfite was impregnated into various porous media, including halloysite nanoclay, activated carbon, montmorillonite, and silica gel. The oxygen scavenger, produced by impregnating silica gel with sodium metabisulfite, demonstrated a 425% improvement in the initial oxygen removal rate compared to pure sodium metabisulfite. Additionally, sachets containing an oxygen-removing composition with an enhanced oxygen removal rate effectively decreased the oxygen concentration to less than 0.5% on the third day of storage in apple packaging, without elevating carbon dioxide levels. Moreover, it proved effective in preventing the browning of the apple surface. Therefore, the SM/SG oxygen-removal composition can be effectively applied to active food packaging by controlling the oxygen concentration within the packaging.

• Korean Journal of Environmental Biology
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• v.18 no.4
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• pp.395-401
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• 2000

Growth and biochemical composition were analyzed in Gymnodinium sanguineum and Skeletonema costatum grown in media containing various nitrate and phosphate concentrations. Concentrations of nitrate and phosphate in the growth media were 0, 0.3, 0.6, 0.9, 1.2mM and 0, 15, 30, 45, 60 $\mu$M, respectively. Growth of G. sanguineum was suppressed in the low concentration of nitrate and phosphate (below N = 0.3 mM and P = 15 $\mu$M), whereas growth of S. costatum did not changed. At the low concentrations of nitrate and phosphate, amount of intracellular protein and carbohydrate in G. sanguineum cells were largely decreased, whereas content of carbohydrate in S. costatum cells was increased little. Amount of neutral lipid and phospholipid in G. sanguineum didn't changed, but concentration of glycolipid was largely decreased in the medium containing low concentrations of nitrate and phosphate. However the levels of TAG, glycolipid, and phospholipid did not changed in S. costatum cells. These results show that S. costatum is more adaptable than G. sanguineum in the low concentration of nitrate and phosphate.

• Genomics & Informatics
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• v.8 no.4
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• pp.177-184
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• 2010

The target of rapamycin (TOR) signaling pathway is a conserved pathway that regulates eukaryotic cell growth in response to environmental cues. Chemical genomic approaches that profile rapamycin sensitivity of yeast deletion strains have given insights into the function of TOR signaling pathway. In the present study, we analyzed the rapamycin sensitivity of yeast deletion library strains on synthetic medium. As a result, we identified 130 strains that are hypersensitive or resistant to rapamycin compared with wild-type cells. Among them, 36 genes are newly identified to be related to rapamycin sensitivity. Moreover, we found 16 strains that show alteration in rapamycin sensitivity between complex and synthetic media. We suggest that these genes may be involved in part of TOR signaling activities that is differentially regulated by media composition.

• 한국생물공학회:학술대회논문집
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• 2003.04a
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• pp.460-465
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• 2003

A bacterium, named as strain KL34, producing extracellular pectinase was isolated from soil. The mophological cheracteristics of the isolated bacterium were gram-negative, rod-shaped and endospore unformed. Production of pectinase of strain KL34 was induced only by polygalacturonic acid added to the culture media as a sole carbon source. Pectinase activity of KL34 reached a maximum value in the culture conditions of pH 8.5 at $25^{\circ}C$. Optimal medium for pectinase production was determined to the composition of 2% polygalacturonic acid, 0.25% yeast extract, 0.02% $K_2HPO_4$, 0.02% $CaCl_2$, and 0.05% KCl per liter. The pectinase activity in the culture supernatant reached the highest amount of 54 U/ml after 3 days cultivation in the optimal media.

• Journal of the Korean Society of Environmental Restoration Technology
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• v.8 no.4
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• pp.81-90
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• 2005

This study aimed to address problems and suggest solutions in applying seed mixture design criterior of the slope revegetation works according to "The guidelines of Slope revegetation design and construction" proposed by the Ministry of Construction and Transportation. To do this, the planting thickness was set to be the same 2cm while the composition of seeds was made different, which was planted in artificial slopes and fields. The main results were summarized as follows. In the test, when applying the provisional standards of the plant mixtures proposed by the Ministry of Construction and Transportation, tree seeds and native plants were found poor coverage effect in the early stage in all test plots due to introduced grasses. This was because introduced winter grasses which grew well in the early stage, could grow densely, so it might hamper the growth of other plants. Therefore, it was found desirable that standards for seed mixing should be adjusted down by 10% and the ratio of introduced grasses in the mixture should be lowered to 25% while native plants should increase to 20-25%.

• Proceedings of the Korean Society of Broadcast Engineers Conference
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• 2017.06a
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• pp.184-185
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• 2017

최근 기술의 발전으로 자연스러운 미디어와 실재감을 제공하는 차세대 3D 기술이 많은 관심을 받고 있다. MMT는 MPEG에서 표준화를 진행하고 있는 차세대 미디어 전송 규격으로 방송망(Broadcast Network)과 인터넷을 동시에 서비스할 수 있는 하이브리드 방송에 적합한 기능을 제공한다. 본 논문에서는 8K(7,680 x 4,320)의 해상도를 가지는 영상을 다채널(4개의 채널) 영상으로 분리하고, 각각의 분리된 영상을 MPEG MMT 프로토콜을 이용해서 서버에서 4개의 채널로 전송, 4개의 클라이언트에서 미디어를 수신하고, 동기화 알고리즘을 이용하여 동기를 맞춘 후 최소의 지연시간 이내에 4채널의 미디어를 재현할 수 있는 기술을 설계하고 구현하였다.

• Microbiology and Biotechnology Letters
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• v.17 no.5
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• pp.524-528
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• 1989

A $\beta$-Galactosidase producing strain, Alkalophilic Bacillus sp, YS-309, has been isolated from soil sample. The strain was capable of producing large amount of intracellular $\beta$-galactosidase in the alkaline media rather than in the neutral media. The preferable medium composition has been determined to be as follows: 0.5% lactose, 0.5% yeast extract, 0.5% soybean meal, 0.1% KH$_2$PO$_4$, 0.02% MgSO$_4$7$H_2O$ 0,0.6% Na$_2$CO$_3$ (pH 9.9). The enzyme was produced by lactose or IPTG as in-ducer. But both Enzyme synthesis and cellular growth were decreased when lactose was added at the higher concentrations than 1.5% (v/v).

• Proceedings of the Korean Society of Broadcast Engineers Conference
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• 2014.11a
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• pp.107-110
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• 2014

방통융합시대가 도래함에 따라 방송망뿐만 아니라 IP망을 통해 콘텐츠를 소비할 수 있는 스마트TV의 보급이 급속히 확산되고 있다. 또한 영상과 음악 및 광고와 같은 멀티미디어 콘텐츠의 소비 환경이 한 화면에 한 가지의 미디어 서비스만 제공받는 환경에서 다양한 정보를 동시에 소비할 수 있는 환경으로 확대되면서 다양한 정보를 하나의 화면에서 혼용적으로 전달하기 위한 장면구성정보가 필요하게 되었다. 장면구성정보는 미디어가 소비되는 특정 시간과 해당 공간의 정보를 기술하므로써 다수의 미디어를 복합적으로 소비하는 방법으로, IP 기반에서도 여러 개의 화면을 통해 여러 소스의 콘텐츠를 소비하여 다양한 사용자 경험(User Experience)를 제공하고자 ISO/IEC JTC1/SC29/WG11(별칭 MPEG)에서는 방송서비스에서 방송망 및 IP망을 활용하여 멀티미디어 데이터를 전송할 때 사용하는 MPEG Media Transport(MMT)를 기반으로 장면구성정보를 제공하기 위한 MMT-Composition Information(MMT-CI)를 기술표준화하였다. 본 논문에서는 MMT-CI의 표준문서에 따라 W3C의 웹언어인 HTML5와 확장성 언어인 XML을 이용하여 멀티소스를 활용한 장면구성정보를 기술하는 것을 제안하고 장면구성서비스에 적용을 위한 플레이어를 구현 및 검증한다.

• Proceedings of the Materials Research Society of Korea Conference
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• 2011.05a
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• pp.244.2-244.2
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• 2011

We introduce a novel and robust method for the preparation of nanocomposite multilayers, which allows the excellent photoluminescent (PL) properties as well as the accurate control over the composition and dimensions of multilayers. By exchanging the oleic acid stabilizers of CdSe@ZnS quantum dots (QDs) synthesized in organic solvent with 2-bromo-2-methylpropionic acid (BMPA) in the same solvent, these nanoparticles were be alternately deposited by nucleophilic substitution reaction with highly branched poly(amidoamine) dendrimer (PAMA) through layer-by-layer (LbL) assembly process. Our approach does not need to be transformed into the water-dispersible nanoparticles with electrostatic or hydrogen-bonding groups, which can deteriorate their inherent properties, for the built-up of multilayers. The nanocomposite multilayers including QDs exhibited the strong PL properties achieving densely packed surface coverage as well as long-term PL stability under atmospheric conditions in comparison with those of conventional LbL multilayers based on electrostatic interaction. Furthermore, we demonstrate that the flexible multilayer films with optical properties can be easily prepared using nucleophilic substitution reaction between bromo and amino groups in organic media. This robust and tailored method opens a new route for the design of functional film devices based on nanocomposite multilayers.