• Proceedings of the KSRS Conference
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• 1999.11a
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• pp.343-348
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• 1999

Delineation of watersheds is one of the most basic steps for water resource management and National Park management. The purpose of this study is to investigate how to utilize Thematic Mappers scenes to compare watersheds created by running a model with those produced by digitizing topographic maps of Keum River basin. A methodology is designed and tested using Geographic Information Systems (GIS) and remote sensing to map areas with various thematic maps. A CAD data on watersheds from the Decision Support system for Water Quality is converted into GIS format. The digital elevation model with 100-meter resolution is used to create watershed by cumulative watershed method. TM scenes are also classified by new procedures including stacking method, NDVI, NDWI, and unsupervised classification methods. To evaluate the relative correctness Kyerongsan National Park was studied intensively whose area was divided into 6 watersheds in both cases. The boundaries of watershed from the model are less correct than those of the topographic maps. This result shows that automated watershed creating system needs higher-resolution digital elevation model than 100-meters.

• Journal of KIISE:Software and Applications
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• v.29 no.10
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• pp.747-754
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• 2002

In this paper, We propose a document thematic words extraction by using principal component analysis(PCA) which is one of the multivariate statistical methods. The proposed PCA model understands the flow of words in the document by using an eigenvalue and an eigenvector, and extracts thematic words. The proposed model is estimated by applying to document summarization. Experimental results using newspaper articles show that the proposed model is superior to the model using either word frequency or information retrieval thesaurus. We expect that the Proposed model can be applied to information retrieval , information extraction and document summarization.

• Journal of The Korean Association For Science Education
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• v.28 no.8
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• pp.832-847
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• 2008

This study aims to provide a cornerstone for 'Pedagogical Discourse Analysis' by connecting linguistic theory to science education practice. Pedagogical Discourse Analysis (PDA) focuses its attention on finding educational implications beyond description on classroom language. This study is specially aimed at PDA in terms of the textual aspect, which has not sparked interest in science classroom discourse. For this, we supposed that the framework of PDA composed of two axes: 'thematic flow' and 'information flow'. We presented a case of science classroom discourse in terms of PDA to investigate opportunities in its potential and utilities. This trial crosses the line of traditional science classroom discourse analysis, which has been inclined to linguistics theory. It will also suggest a new horizon for science classroom discourse in an educational context.

• KSII Transactions on Internet and Information Systems (TIIS)
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• v.10 no.10
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• pp.4902-4932
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• 2016

The popularity of network virtualization has recently regained considerable momentum because of the emergence of OpenFlow technology. It is essentially decouples a data plane from a control plane and promotes hardware programmability. Subsequently, OpenFlow facilitates the implementation of network virtualization. This study aims to provide an overview of different approaches to create a virtual network using OpenFlow technology. The paper also presents the OpenFlow components to compare conventional network architecture with OpenFlow network architecture, particularly in terms of the virtualization. A thematic OpenFlow network virtualization taxonomy is devised to categorize network virtualization approaches. Several testbeds that support OpenFlow network virtualization are discussed with case studies to show the capabilities of OpenFlow virtualization. Moreover, the advantages of popular OpenFlow controllers that are designed to enhance network virtualization is compared and analyzed. Finally, we present key research challenges that mainly focus on security, scalability, reliability, isolation, and monitoring in the OpenFlow virtual environment. Numerous potential directions to tackle the problems related to OpenFlow network virtualization are likewise discussed.

• Journal of The Korean Association For Science Education
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• v.30 no.6
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• pp.815-835
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• 2010

This study aimed at understanding the characteristics of interactive discourses between docents and visitors in natural history museums. Two docents participated in this study. One worked in Seodaemoon Natural History Museum and the other in Gwacheon National Science Museum. To analyze the characteristics of interactive discourses, especially understanding the mediation of visitors' learning, Pedagogic Discourse Analysis method was adopted. The results show two contrasting types of interactive discourses, Encouraging Visitors' Meaningful Participation (EVMP) and Encouraging Visitors' Simple Participation (EVSP). In the EVMP discourse, structural cohesion is strong in thematic flow and information flow. Docent and visitors share the role of information provider and "Themes" are developed through the interactions between the docent and the visitors. On the contrary, in the EVSP discourse, structural cohesions are weak. Even though the visitors participate in the discourse, their discourse scarcely contribute to develop "Themes" in the discourse. Most of the information is developed and expanded by the docent. These results helped us to suggest that docents have to understand and use visitors' prior knowledge as a discourse "Theme." It is also suggested that docents need to have not only the competent content knowledge about exhibitions but also the capability to lead discourses that allow the visitors to participate meaningfully during the education processes.

• Journal of The Geomorphological Association of Korea
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• v.23 no.1
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• pp.117-128
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• 2016

High resolution aerial photographs and digital elevation models for Bangpo beach using UAV were generated in this study to analyze the thematic and geometric characteristics of coastal features. Based on 728 aerial images acquired on September 10, 2016 by the UAV, a image mosaic at 2.2 cm spatial resolution and a digital elevation model at 4.4 cm spatial resolution were developed. This study found out that Bangpo beach consisted of intertidal zone and supratidal zone. The intertidal zone can be subdivided into lower part and upper part with distinctive geomorphological characteristics. While the lower part included sand bars and ripple marks along the coastline, the cusps and sand dunes were the major coastal features of the upper part. Part of the intertidal zone was occupied by shore platform with average slope of 0.9 degree containing various sizes of gravels. The supratidal zone slanted toward ocean with berms on the surface with an interval of 15 m. These coastal features indicated the flow intensity towards to the land and tidal effect. It validated that the UAV application in coastal research was very effective analyzing to examine coastal processes.

• Journal of Korea Water Resources Association
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• v.35 no.4 s.129
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• pp.411-423
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• 2002

Accurate and real time forecasting of runoff has a high priority in the drainage basins prone to short, high intensity rainfall events causing flash floods. To take into account the resolution of hydrological variables within a drainage basin, use of distributed system models is preferred. The Landsat Thematic Mapper(TM) observations enable detailed information on distribution of land cover and other related factors within a drainage basin and permit the use of distributed system models. This paper describes monitoring technique of rainfall excess by SCS curve number method. The time series maps of rainfall excess were generated for all the storm events to show the spatiotemporal distribution of rainfall excess within study basin. A combination of the time series maps of rainfall excess with a flow routing technique would simulate the flow hydrograph at the drainage basin outlet.

• Korean Journal of Remote Sensing
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• v.34 no.6_2
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• pp.1165-1178
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• 2018

Collapse of an Antarctic ice shelf and its flow velocity changes has the potential to reduce the restraining stress to the seaward flow of the Antarctic Ice Sheet, which can cause sea level rising. In this study, variations in ice velocity from 2000 to 2017 for the Nansen Ice Shelf in East Antarctica that experienced a large-scale collapse in April 2016 were analyzed using Landsat-7 Enhanced Thematic Mapper Plus (ETM+) and Landsat-8 Operational Land Imager (OLI) images. To extract ice velocity, image matching based on orientation correlation was applied to the image pairs of blue, green, red, near-infrared, panchromatic, and the first principal component image of the Landsat multispectral data, from which the results were combined. The Landsat multispectral image matching produced reliable ice velocities for at least 14% wider area on the Nansen Ice Shelf than for the case of using single band (i.e., panchromatic) image matching. The ice velocities derived from the Landsat multispectral image matching have the error of $2.1m\;a^{-1}$ compared to the in situ Global Positioning System (GPS) observation data. The region adjacent to the Drygalski Ice Tongue showed the fastest increase in ice velocity between 2000 and 2017. The ice velocity along the central flow line of the Nansen Ice Shelf was stable before 2010 (${\sim}228m\;a^{-1}$). In 2011-2012, when a rift began to develop near the ice front, the ice flow was accelerated (${\sim}255m\;a^{-1}$) but the velocity was only about 11% faster than 2010. Since 2014, the massive rift had been fully developed, and the ice velocity of the upper region of the rift slightly decreased (${\sim}225m\;a^{-1}$) and stabilized. This means that the development of the rift and the resulting collapse of the ice front had little effect on the ice velocity of the Nansen Ice Shelf.

• English Language & Literature Teaching
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• no.4
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• pp.249-267
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• 1998

"The Waste Land" is Eliot's best known poem. It was first published in 1922 and became a famous poem in modem poetry by the 1940's. The poem is a statement of his personal experience with spiritual crisis, this simple outline is complicated and universalized by being set within the structure of 'the Fisher King legend'. The fisher King legend was studied by Miss Weston in From Ritual to Romance and Sir James Frazer in The Goldon Bough which traced the vegetation myths. It explained the cycle of the seasons in relation to the death and rebirth of a god. The god died in the winter with the death of the vegetation and was reborn in the spring with the rebirth of the vegetation. Sir James Frazer reaced these ancient rituals within the Christian world. He indicated that the death and rebirth of Christ falls within the pattern of this ancient ritual. Also Miss Weston transformed that ancient ritual into Christian terms, and connected it with the Quest for the Holy Grail. Eliot used not only the title, but the plan and a good of the important symbolism of the poem from these two books. "The Waste Land" is a difficult one because of the numerous interruptions in the narrative. On the superficial level, the story covers a 12-hour period in a day. It is also in "the stream of consciousness." It might be called the internal monologue; that is, "the free association of ideas in the mind of the narrator," Eliot experiments with both the idea of time and with the stream of consciousness, He employs a number of quotations and allusion from the Classic literature. So, his technique in "The Waste Land" consists of the juxtaposition of the present with mythcism and religious symbolism derived from the past. The structure of the poem is built out of the contrasts in time. The poem illustrates his conception of the past as an active part of the present. "The Waste Land" has "a symphonic structure" composed of five parts, which are linked by the repeated themes. The theme is the death and salvation of the Waste Land. It is drawn from the Fisher King myths. Moreover, he has absorbed into the structure of this poem the language, phrases, and associations of other writers. It gave the poem the universality both of theme and of pattern. Also, his intricate and fine techniques added the universality to the poet's personal material. At last, the verse pattern of the poem follow the same basic structure as the thematic patterns. Again in symphonic style, the verse varies from section to section. The interruption of real time is associated with the flow of consciousness. Though the poem is a complex structure, there are the interweavings of a great deal of ideas into a simple, brief statement. By these poetic techniques the poem manages to have good harmony and unity between the thematic pattern and narrative structure. "The Waste Land" therefore, became the greatest poem in the 20th century modern world.

• Journal of the Korean Association of Geographic Information Studies
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• v.6 no.4
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• pp.122-134
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• 2003

In recent, different kinds of nationwide thematic map have been developed based on NGIS, and each related research field has tried to develop GIS by utilizing this map. Also, Many researches on the geographic information data model has been conducted to improve the compatibility of developed system. The developed system in water resource field should reflect the dynamic characteristics of river flow. Because it should be considered from the design of data model, this study suggests the datamodel for designing geographical information database on water resources which is possible to linear reference capacity based on stream network. In order to examine the applicability of the suggested model, network component based system has developed. Finally, the river network based system shows the superiority in terms of its applicability comparing with other system.