• Journal of The Geomorphological Association of Korea
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• v.20 no.3
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• pp.55-63
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• 2013

The study deals with the geochemical analyses on the stratigraphy and sedimentation of the paleofluvial outcrop under Jeongok basalt layer in Chugaryeong Rift Valley. The results of field survey and analysis show that the paleofluvial sand and gravel layers had been constructed before the arrival of basaltic lava in Jeongok area of Hantan River valley in central Korea. XRF, for the main elements analysis, results present that JG2-3, a test sample from basalt weathering layer, has different characteristics from 5 other samples in the aspects of chemical weathering levels. ICP-MS, for analysis of the rare earth elements analysis, estimates that gravel layer, in the lowest part of the outcrop, had been originated from pre-lava bedrocks near the upper reach of the Hantan River, so the layer is almost not related to basalt layers. Finally, the OSL dating results in paleofluvial sedimentation had been in process until nearly 40,000 BP, before formation of lava plateau in the Jeongok area.

• The Journal of the Petrological Society of Korea
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• v.23 no.4
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• pp.385-391
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• 2014

Quaternary basaltic rocks occur as volcanic plateau and/or river cliff in the watershed area of Hantan River in Jeongok, central Korea. We measured $^{40}Ar-^{39}Ar$ ages for the basaltic rocks from Jeongok area using the multi-collector noble gas mass spectrometer and laser heating device introduced for the first time in Korea. The basaltic rocks from the river cliff in Eundae-ri area show the systematic change in $^{40}Ar-^{39}Ar$ ages from $0.54{\pm}0.07Ma$ through $0.48{\pm}0.01Ma$ to $0.12{\pm}0.01Ma$ toward the top. The other sample from Jeongok-ri area yields the age of $0.43{\pm}0.04Ma$. This results suggest that there might be a episodic volcanic eruption between 0.12-0.54 Ma in Jeongok area.

• 한국가스학회:학술대회논문집
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• 2002.05a
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• pp.172-178
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• 2002

• Economic and Environmental Geology
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• v.37 no.3
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• pp.325-334
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• 2004

Detail downward variation records for paleomagnetic, XRD, photospectrogram, TOC results were obtained from the soil developed along the Hantan River, Gungpyeong-ri, Cheongsan-myeon, Yeoncheon-gun Gyeonggi-do. The unconsoildated sediments underlain by the Jeongok Quaternary Basalt indicates that the paleosol formed twice with different ages, as apparently indicated by sedimentological, paleomagnatic, and soil chemical properties. The paleosols recorded paleoclimate and paleoenvironments of about 271.21$\pm$89.8 ka before eruption of the Quaternary Jeongok Basalt.

• Journal of The Geomorphological Association of Korea
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• v.27 no.4
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• pp.41-51
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• 2020

The Cheolwon-Pyeonggang Lava Plateau on the Chugaryeong tectonic valley is one of the most extensive volcanic areas in central Korea. However, formative age and process of the plateau still remains a controversial issue. This study presented OSL ages on the upper and lower sedimentary layers of basalt from four sites in the Cheolwon and Yeoncheon areas and estimated age and process of plateau formation based on sedimentary- and chrono-stratigraphy and topographic analysis. The results suggested that most of the initial topography of the plateau on the Cheolwon and Yeoncheon areas had been almost completed before approximately 90 ka. However, the last lava flow around Jangheung-ri, Cheolwon, seemed to occur until 20-30 ka and had led to complete the present plateau, while the last lava flow in the Jeongok area, Yeoncheon, was estimated to occur at approximately 40 ka.

• The Journal of the Korea Contents Association
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• v.7 no.10
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• pp.321-329
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• 2007

The form of travel has been changing to dynamic, experience and family. Festivals are popular, specially the historic culture festivals, whose themes are a history event, a time and the people, are preferred to families because they give visitors opportunities of education and experience. Evaluation of festivals is important that it diagnoses the problems and enhancement One of the evaluation methods, Importance-Performance Analysis is useful which it is easy to find priority with visual matrix without complex statistical technique and a technical terminology. This research used IPA to evaluate The Yeoncheon Jeongok Paleolithic Festival which is one of the popular historic culture festivals. From the result 'unique food', 'rest facility', 'other convenience facility', 'hygiene', 'crowding' were included in selected to 'concentrate' territory of the IPA matrix. Therefor the festival manager should put his efforts to develop unique food, build more rest and other convenience facilities, enhance hygiene, and lowered crowding.

• Korean Journal of Fisheries and Aquatic Sciences
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• v.53 no.3
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• pp.316-325
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• 2020

The purpose of this study was to optimum formulation conditions for the preparation of retort pouched marsh snail Senisulcospira livertina soup with curled mallow Malva verticillata and optimized the sterilization process. Samples were prepared according to the central composite rotatable design (CCRD) by encrypting the amounts of marsh snail broth, boiled marsh snail and blanched curled mallow, which are the main ingredients of retort pouched marsh snail soup with curled mallow. Raw marsh snail was sorted by size of 4-5 level, and then marsh snail was washed and removed sediment in a water tank for 3 min, then boiled at 100℃ for 10 min, and then directly separated by hand to prepared a boiled marsh snail. The marsh snail cube is prepared by combining blanched at 100℃ for 10 sec curled mallow (27 g) and green onion (20 g) with boiled marsh snail (27 g) and soybean paste (10 g). The marsh snail cube was placed with marsh snail broth (416 g) in a retort pouch film. Subsequently, sterilization (118.0℃, 25 min; F₀ value, 12 min) and cooling were performed using a steam retort.

• Journal of The Geomorphological Association of Korea
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• v.24 no.4
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• pp.57-73
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• 2017

The formation of the lava dam of the paleo lake blocked the entrance to the Chatancheon River on the Jeongok lava plateau and it suddenly transformed the terrestrial ecosystem into the aquatic one by the overflow. The spiders in the lava dam adapted in the wetland and evolved into water spiders that could survive by forming bubble houses. Since then, the lava dam was connected to the present Hantangang River due to the dissection and the lake became a terrestrial environment, a small area of marsh composed of primarily clay soil layer. Change in water level of the habitat and thus the extension of the terrestrial area made the species a endangered now. This study carried out frequency of occurrence, degree of wetness and plant habitats of the vascular plant in the water spider habitat. As a result of this study, total 180taxa are of 55 (30.6%) wetland plant groups and of 113 (62.8%) upland plant groups except facultative plant groups. Among the wetland plant groups, the Isachne globosa community occupied the largest area, where the water spiders were most observed. The result of this study, the classification and the types of vascular plant species, would provide useful information for the sustaining healthy wetland ecosystem and the restoration of the habitat for the water spiders.

• Food Engineering Progress
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• v.21 no.4
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• pp.318-325
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• 2017

Alcoholic steatosis is a fundamental metabolic disorder and may precede the onset of more severe forms of alcoholic liver disease. In this study, we isolated enzymatichydrolysate from Semisulcospira libertine by alcalase hydrolysis and investigated the protective effect of Semisulcospira libertine hydrolysate on liver injury induced by alcohol in the mouse model of chronic and binge ethanol feeding (NIAAA). In an in vitro study, the hydrolysate protects HepG2 cells from ethanol toxicity. Liver damage was assessed by histopathological examination, as well as by quantitating activities of serum aspartate aminotransferase (AST), alanine aminotransferase (ALT), and alkaline phosphatase (ALP). After the administration of S. libertina hydrolysate, fat accumulation and infiltration of inflammatory cells in liver tissues were significantly decreased in the NIAAA mouse model. The elevated levels of serum AST, ALT, and ALP activities, along with the lipid contents of a damaged liver, were recovered in experimental mice administrated with S. libertina hydrolysate, suggesting its role in blood enzyme activation and lipid content restoration within damaged liver tissues. Moreover, treatment with S. libertine hydrolysate reduced the expression rate of cyclooxygenase (COX-2), interleukin $(IL)-1{\beta}$, and IL-6, which accelerate inflammation and induces tissue damage. All data showed that S. libertine hydrolysate has a preventive role against alcohol-induced liver damages by improving the activities of blood enzymes and modulating the expression of inflammation factor, suggesting S. libertine hydrolysate could be a commercially potential material for the restoration of hepatotoxicity.

• 한국신재생에너지학회:학술대회논문집
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• 2010.06a
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• pp.226.2-226.2
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• 2010

수소경제로 가는 길목에서의 압축천연가스에 수소를 첨가한 수소-압축천연가스(HCNG)는 자동차 연료로서의 뛰어난 효과로 인해 미국, 캐나다, 유럽 등에서는 강화되고 있는 자동차의 배출가스 규제에 대해 만족할 수 있는 차세대 천연가스 자동차의 대안으로서 관련 기술개발과 실증사업에 주력하고 있다. 향후 수소시대의 도래에 즈음하여 HCNG의 사용은 수소사용에 대한 인식 향상과 아울러 수소사용을 안정적으로 공급할 수 있는 토대를 마련하고 수소제조 등 여러 분야에서 기술개발을 할 수 있는 부가적인 효과가 있다고 하겠다. 따라서 최근 국내에서 시내버스와 청소차등에서 천연가스 차량의 보급이 확대되고 있고, 충전소도 점차 확대되고 있는 상황에서 HCNG 연료의 적용가능성을 확인하기 위한 연구가 진행되고 있다. 본 논문에서는 선진국과 국내의 기술개발 현황을 소개하고 향후 우리에게 필요한 과제가 무엇인지를 생각해보는 기회를 갖고자 하였다.