• The Korean Journal of Quaternary Research
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• v.24 no.1
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• pp.11-24
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• 2010

Seongnyu Cave have developed along the NE-SW direction in carbonate rocks of the Joseon Supergroup. The cave mostly shows horizontal passages and contains three lakes. The main passage is about 330 m long with 540 m-long branches, thus the total length of the cave is about 870 m. Through cave diving, about 85 m-long new passages were discovered. Numerous speleothems such as soda straws, stalactites, stalagmites, columns, flowstones, rimstones, cave shields, cave corals, curtains (and bacon sheets), cave pearls, cave flowers, helictites and calcite rafts can be found in the cave. Especially, some speleothems which were believed to have grown in the past were discovered in the submerged passage, and a few stalactites, stalagmites, flowstones and columns were eroded (or corroded) by the cave stream that flowed on the floor. Because these speleothems only grow in subaerial environments within limestone caves, it appears that they grew when there was no lake in the cave and became submerged as the lake level rose in the cave. The presence of these speleothems in the lakes indicate that they only grew during glacial periods when sea-level was lower. Therefore, detailed investigation of these speleothems will provide invaluable information on paleoclimatic evolution around the Korean peninsula in the future.

• Journal of the Speleological Society of Korea
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• no.93
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• pp.13-25
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• 2009

This study, which includes case studies that provide information of cave tour resources, considered a variety of selected variables of the internal and external parts of caves with the expanded factors of the academic classification in caves. It uses the cluster analysis, one of the multivariate analysis techniques, and applied the results for review. As a result, public caves can present multiple classification criteria according to the factors of the surrounding area's human environment. The result, classified by the region in public caves, is derived from this study.

• Journal of KIISE:Computer Systems and Theory
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• v.33 no.6
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• pp.354-362
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• 2006

This paper suggests a method for generating high qualify stereo video avatar to support visual communication in a CAVE$^{TM}$-like system. In such a system because of frequent change of light projected onto screens around user, it is not easy to extract user silhouette robustly, which is an essential step to generate a video avatar. In this study, we use an infrared reflective image acquired by a grayscale camera with a longpass filter so that the change of visible light on a screen is blocked to extract robust user silhouette. In addition, using two color cameras positioned at a distance of a binocular disparity of human eyes, we acquire two stereo images of the user for fast generation and stereoscopic display of a high quality video avatar without 3D reconstruction. We also suggest a fitting algorithm of a silhouette mask on an infrared reflective image into an acquired color image to remove background. Generated stereo images of a video avatar are texture mapped into a plane in virtual world and can be displayed in stereoscopic using frame sequential stereo method. Suggested method have advantages that it generates high quality video avatar taster than 3D approach and it gives stereoscopic feeling to a user 2D based approach can not provide.

• Korean Journal of Environmental Agriculture
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• v.41 no.1
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• pp.65-70
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• 2022

BACKGROUND: The Geomunoreum Lava Tube System (GLTS) is both vast and culturally valuable. The Jeju Volcanic Island and Lava Tubes, which are partly composed of the GLTS, have been declared as a United Nations Educational, Scientific, and Cultural Organization (UNESCO) World Heritage Site. Exploration of the caves is strictly regulated to conserve these vulnerable environments. Photographs provide limited information and do not describe the entire environment comprehensively. Therefore, we created several illustrations of the lava tubes to display their environmental features. METHODS AND RESULTS: We explored six lava caves (upstream and downstream) in the GLTS and photographed their geological features and yellow walls, the colors of which are influenced by microbial mats. We compared the hex codes of the wall colors using the Clip Studio v1.10.5 software and created illustrations that accurately represent the scale and features of the caves. CONCLUSION(S): Upstream and downstream caves of the GLTS differ in scale and volcanic features. We illustrated various characteristics of the caves including lava cave features, vegetation, and microbial mats. We also described the internal and external cave environments.

• Journal of the Korean earth science society
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• v.21 no.4
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• pp.408-422
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• 2000

Multiple geophysical methods were applied over the Manjang cave area in Cheju Island to compare and contrast the effectiveness of each method for exploration of underground cavities. The used methods are gravity, magnetic, electrical resistivity and GPR(Ground Pentrating Radar) survey, of which instruments are portable and operations are relatively economical. We have chosen seven survey lines and applied appropriate multiple surveys depending on the field conditions. In the case of magnetic method. two-dimensional grid-type surveys were carried out to cover the survey area. The geophysical survey results reveal the characteristic responses of each method relatively well. Among the applied methods, the electric resistivity methods appeared to be the most effective ones in detecting the Manjang Cave and surrounding miscellaneous cavities. Especially, on the inverted resistivity section obtained from the dipole-dipole array data, the two-dimensional distribution of high resistivity cavities are revealed well. The gravity and magnetic data are contaminated easily by various noises and do not show the definitive responses enough to locate and delineate the Manjang cave. But they provide useful information in verifying the dipole-dipole resistivity survey results. The grid-type 2-D magnetic survey data show the trend of cave development well, and it may be used as a reconnaissance regional survey for determining survey lines for further detailed explorations. The GPR data show very sensitive response to the various shallow volcanic structures such as thin spaces between lava flows and small cavities, so we cannot identify the response of the main cave. Although each geophysical method provides its own useful information, the integrated interpretation of multiple survey data is most effective for investigation of the underground caves.

• The Korean Journal of Quaternary Research
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• v.25 no.1
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• pp.41-49
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• 2011

Archaeological survey has been carried out to find some evidence of human occupation in 31 caves in Pyeoungchang, Danyang, Jincheon, Goesan, Munkyoung, Boeun, Sangju in central limestone area of the Korean peninsula. Among those caves, some archaeological evidences were observed in 11 caves. Various types of potteries, animal bones and stone artifacts were collected on surface of sediments in caves. Among them, the Mosan cave in Munkyoung and the Kwangcheonseongul in Pyeoungchang are very likely to yield important archaeological remains in the well preserved deposits in the caves. Further researches are expected to provide significant information for explaining human living from prehistoric time to historical periods.

• Korean Journal of Environmental Biology
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• v.33 no.4
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• pp.394-402
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• 2015

This study was carried out to investigate the bat (Chiroptera) fauna in Jeju Island. Bat distribution was monitored in lava tubes, sea caves, cave encampments and eco-corridors from July, 2006 to June, 2015. Bat specimens were also confirmed at the museums in Jeju Island. From the present study, we found 8 species of 6 genera belong to 3 families, which was different from the records had previously described in Jeju Island since 1928. Five species (Rhinolophus ferrumequium, Myotis bombinus, M. formosus, M. macrodactylus and Miniopterus schreibersi) were commonly found to live in lava tubes and cave enforcements. But only R. ferrumequium was found in a sea cave and five species including Murina leucogaster and Pipistrellus abramus were found in eco-corridors. We have also found seven species including Tadarida insignis in the specimens stored in local museums. From the results of this study, we actually could not found the remaining seven species (Hypsugo savii, Miniopterus fuscus, Myotis mystacinus, Myotis ikonnikovi, Myotis branditii, Myotis petax and Pipistrellus endoi). Interestingly, Myotis formosus which is known as one of endangered species and Myotis bombinus which is very rare in Korean Peninsula were currently found in Jeju Island. In addition, Tube-nosed bat (Murina leucogaster) that was discovered for the first time through this study. A variety of habitats for Chiroptera were identified, but the information is still not sufficient to understand. These results will be useful to provide a fundamental data in preserving the diversity of bats and in ecological study in Jeju Island.

• Journal of Korean Medical classics
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• v.23 no.2
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• pp.191-203
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• 2010

"Bonchogyeongjipju(本草經集注)" is a pharmacological classic published in the Southern and Northern Dynasties(南北朝時代, 420-589 A.D.) in China by Dohonggyeong(陶弘景, 456-536 A.D.). In "Bonchogyeongjipju(本草經集注)", Dohonggyeong(陶弘景) edited "Sinnongbonchogyeong(神農本草經)", the earliest classical text about material medica containing notes for 365 drugs, by adding another 365 drugs and further information from "Myeong-uibyeollok(名醫別錄)" and writing extended commentaries on them. His commentaries include changes in the geographical distribution, identification of varieties and other various special characteristics. The original text had gradually disappeared after other pharmacological classics were published such as "Sinsuboncho(新修本草)", in Dang Dynasty(唐代), "Gyeongsajeungryubigeupboncho(經史證類備急本草)" in Song Dynasty(宋代). All of these books were based on "Bonchogyeongjipju(本草經集注)", so the original text can be seen indirectly through these later sources. In the early 1900's, a transcribed manuscript of the preface "Bonchogyeongjipju(本草經集注)" was found almost wholly preserved except the first three lines, in the Makgo(莫高) cave of Donhwang(敦煌). Broken strips of transcribed "Bonchogyeongjipju(本草經集注)" have also been excavated in Turfan[吐魯番], which shows its original form written in red and black ink. Mayanagi Makoto[眞柳誠] researched on Donhwang(敦煌) and Turfan[吐魯番] editions, ascertained their existence and explained their bibliographical and historical facts. Sangjigyun(尙志鈞) restored "Bonchogyeongjipju(本草經集注)" based on other related sources such as Donhwang(敦煌) and Turfan[吐魯番] editions. " Bonchogyeongjipju(本草經集注)" can be said as the locus classicus(典範) of herbal medicine, that is most of the following materia medica was based on it. It makes it possible to pass down "Sinnongbonchogyeong(神農本草經)" to posterity and provide a foundation for herbal medical development.

• Journal of Environmental Policy
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• v.14 no.4
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• pp.103-123
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• 2015

To provide effective management policy of geo-heritages, concept of Korean geo-heritage has been organized based on geo-diversity, geo-conservation, geo-tourism, and earth-heritage. In addition, current status of geo-heritage in Korea has been grasped, and categorized. In case GPS (Global Positioning System) coordinates exist, spatial information was constructed as GIS (Geographic Information System). Geo-heritages were classified into a total of six categories of natural monument, scenic site, coastal sand-dune, natural cave, world nature heritage, and other types of geo-heritage. By mapping 991 geo-heritages scattered nationwide using geographical information, all statuses can now be readily identified and enable the analysis of the distribution tendencies and correlation with topography. This study was aimed at searching the political connection based on quantitatively organized and analyzed geo-heritages, which have not been mapped thus far. In addition, this study organized data that have existed only in literature, and presented example verification. Moreover, these can be used as guidelines for the future search, discovery, registration and management of geo-heritage. If additional geo-heritages are discovered in field studies or with satellite images, then more correlations may be identified and help facilitate the research on geo-heritages management plans.