• Korean Journal of Ichthyology
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• v.13 no.4
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• pp.230-236
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• 2001

Feeding habits of Gobiobotia brevibarba were investigated at Hongcheon River of Bangokri, Seomyon, Hongcheongun, Kangwondo from January to December, 2000. G. brevibarba was a carnivore and consumed mainly Ephemeroptera, Tricoptera and Diptera. Small quantities of Plecoptera and Coleoptera were included as a minor food items. The species showed ontogenetic changes in feeding habits. Individuals of small size (21~50 mm SL) fed mainly on small prey organisms such as Diptera and Ephemeroptera. However, larger Tricoptera were heavily selected with increasing fish size. The relative proportion of these food items changed with season. The prey selection indices for Ephemeroptera were positively selected in spring, summer and autumn, and negatively selected in winter, Diptera were positively selected in March, October and November.

• Proceedings of the Korean Geotechical Society Conference
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• 2010.03a
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• pp.877-882
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• 2010

This paper is a result of investigating causes and main characteristics of landslides, occurred at Hongcheon area in Gangwondo during July in 2006, by collecting relevant data and visiting site. The main cause of landslides in this area has been found to be saturation of the ground wetted by a series of precipitations during 10~13 July and the heavy rainfall during 15 July. The pattern of the landslides could be classified as translational failure, occurred at the boundary between the relatively thin weathered residual soil and the mother rock. By analyzing a number of failed slopes based on site visit and reviewing collected data, typical widths of failed slopes are in the range of 10~20m (minimum: 5m, maximum: 70m). Lengths of landslide area are in the wide range of 10~450m. Most of area are less than 20m in width and 100m in length so that their shapes are long and narrow, frequently observed in Korea, and their areas are relatively small size of around $1000m^2$. The inclinations of the failed slopes are in the range of $10{\sim}60^{\circ}$ while the most probable slope angle is about $20{\sim}25^{\circ}$.

• The Journal of the Petrological Society of Korea
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• v.22 no.4
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• pp.299-305
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• 2013

It is well known that the Hongcheon iron-rare earth deposit is composed of carbonatite-phoscorite complex. We conducted zircon U-Pb age determination for the gneissic country rocks of this deposit. As the result we obtained ca. 1830 Ma, which is somewhat younger than igneous and metamorphic ages of ca. 1870 Ma generally reported from the Gyeonggi massif, suggesting further investigations for the timing and evolution of the Paleoproterozoic activities of the Gyeonggi massif.

• Korean Journal of Environmental Biology
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• v.24 no.1 s.61
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• pp.29-37
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• 2006

We investigated the feeding habits of Rhynchocypris kumgangensis in Hongcheon River of Saenggokri, Seoseokmyeon, Hongcheongun, Gangwon-do, Korea from April 2002 to March 2003. The fish is korean endemic species upper streams in Korea. It was asscertained that R. kumgangensis is a carnivore and consumes mainly Ephemeroptera, Diptera, Terrestrial insects and Trichoptera. The most important prey was chironomids: Chironomus sp. Their feeding habits changed according to growth. Small fish fed mainly on small prey organisms such as Diptera, while larger fish fed much more on Ephemeroptera and Terrestrial insects. There were also seasonal changes in the relative proportion of their food items.

• The Korean Journal of Food And Nutrition
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• v.32 no.5
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• pp.442-453
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• 2019

The purpose of this study was to compare differences in the main food components between Korean and imported quinoa from Peru, the U.S., and Thailand. Proximate composition of Korean quinoa showed highest crude protein and crude ash, while Korean quinoa had lowest moisture. Total amino acid content was higher in Korean quinoa than in imported quinoa. Fatty acid content was highest in quinoa cultivated in the U.S. and Wonju. Quinoa cultivated in Wonju was rich in palmitic acid, lignoceric acid, linoleic acid, eicosadienoic acid, erucic acid, and nervonic acid. Mineral content was higher in Korean quinoa than in imported quinoa. Quinoa cultivated in Wonju showed highest contents of P, Mg, Zn, while quinoa cultivated in Hongcheon showed the highest content of Na. Citric acid was found the major organic acid in quinoa. Citric acid content was highest in quinoa imported from the U.S. and lowest in quinoa cultivated in Hongcheon. Among free sugar, raffinose and glucose contents were highest in quinoa cultivated in Hongcheon, The results of this study show Korean quinoa has high contents of protein, amino acids, fatty acids, minerals and free sugar, offering essential amino acids in an excellent balance.

• Journal of the Mineralogical Society of Korea
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• v.26 no.4
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• pp.299-312
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• 2013

Magnetite, a major constituent mineral of the Hongcheon carbonatite-phoscorite complex, was produced over three stages in each rock type and decreased in quantity toward the late stage. Electron microprobe analyses for magnetite revealed that Ti and V were detected in traces, but showed increasing tendency from early to late stage. On the contrary, Mg and Mn decreased distinctly, and it is the general differentiation trend of carbonatitic magma. Al also showed decreasing tendency in carbonatite and phoscorite, and Cr was mostly below detection limit except late phoscorite. In early stage, $Fe^{2+}$ was largely replaced by $Mg{2+}$ and $Mn^{2+}$, and $Fe^{3+}$ by $Al^{3+}$ in magnetite, but it has nearly pure composition in late stage. Tendency of increase in V and decrease in Mn toward late stage represents that magma differentiation progressed under the condition of decreasing oxygen fugacity. Low concentrations of Mg, Al, Cr and Ti, as well as the absence of olivine and phlogopite, suggest that the Hongcheon carbonatite-phoscorite complex was generated from depleted magma. Especially, lower concentrations of Mg in magnetite compared to other typical carbonatite-phoscorite complex, and abundant occurrence of Fe-carbonate minerals and quartz in late stage, suggest that magma differentiation of the Hongcheon carbonatite-phoscorite proceeded to the latest stage.

• Proceedings of the Korea Institute of Fire Science and Engineering Conference
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• 1999.11a
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• pp.54-62
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• 1999

• Proceedings of the KSEEG Conference
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• 2000.04b
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• pp.268-270
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• 2000

• Journal of Ecology and Environment
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• v.37 no.4
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• pp.315-325
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• 2014

Aerial algae were sampled from 28 sites on rocks, tree barks, and mosses along the Hongcheon-river in Gangwon-do, Korea, from December 2011 to September 2012 and then cultivated. Seven genera and eight species of the order Chlorococcales were newly recorded in Korea. These were Spongiococcum tetrasporum, Tetracystis aggregata, Myrmecia bisecta, Coenocystis inconstans, Lobosphaeropsis pyrenoidosa, Pseudococcomyxa simplex, Coelastrella oocystiformis, and C. vacuolata. As a result, the known Korean flora of the order Chlorococcales now includes 12 families with 54 genera, 263 species, 76 varieties, and 27 forma, giving a total of 366 taxa.

• Journal of Ecology and Environment
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• v.37 no.4
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• pp.341-350
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• 2014

In this study, aquatic and aerial algae were collected in various environments in Hongcheon-river of Gangwan-do between December 2011 and June 2012, with the aim of adding newly described genera and species to the Korean flora. As a result, five genera and eight species were recorded for the first time in Korea. These newly recorded genera and species were Cylindrocapsa geminella, Leptosira mediciana, Pseudendoclonium basiliense var. brandii, Stichococcus minor, S. deasonii, Eustigmatos polyphem, Nephrodiella lunaris, and Xanthonema exile. The eight taxa identified in this study mostly corresponded to their reported morphological characteristics. However, some differences from previous published descriptions were found; N. lunaria, reported to be an aquatic species in a previous study, was found to be an aerial algae inhabiting on rocks and mosses. Cylindrocapsa geminella was found to transform into attached or planktonic algae depending on the environmental condition, and the cell wall was found to be changed. Likewise, E. polyphem was seen to change cell-shape or chloroplast color according to the environment.