• Journal of Environmental Science International
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• v.16 no.10
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• pp.1139-1146
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• 2007

The vascular plants in the Mt. Manduk was listed 560 taxa composed of 110 families, 345 genera, 488 species, 1 subspecies, 67 varieties and 4 forms. Based on the list of the rare plants by the Forest Research Institute, 4 taxa were recorded in the studied areas; Lilium distichum (Preservation priority order; No. 159), Tricyrtis dilatata (No. 97), Aristolochia contorta (No. 151) and Prunus yedoensis (No. 110). Based on the list of Korean endemic plants, 12 taxa were recorded; Cephalotaxus koreana, Carex okamotoi, Lilium amabile, Populus tomentiglandulosa, Salix purpurea var. japonica, Pseudostellaria multiflora, Prunus yedoensis, Stewartia koreana, Forsythia koreana, Paulownia core ana, Weigela subsessilis and Aster koraiensis. Based on the list of approved for delivering overseas of plants, 7 taxa were recorded; Carex okamotoi, Lilium distichum, Aristolochia contorta, Vaccinium oldhami, Paulownia coreana, Asperula lasiantha and Saussurea seoulensis. Specific plants by floral region were total 32 taxa; Prunus yedoensis in class V, Wistaria floribunda in class IV, 5 taxa (Girardinia cuspidata, Spiraea salicifolia, Acer palmatum, Stewartia koreana, Asperula lasiantha) in class III, 3 taxa (Potentilla dickinsii, Viola tokubuchiana var. takedana and Caryopteris incana) in class II and 22 taxa (Pinus koraiensis, Hosta capitata, Chloranthus japonicus, Salix glandulosa, Juglans mandshurica, etc.) in class I. The naturalized plants in the surveyed sites were 14 families, 36 genera, 44 species, 2 varieties, 46 taxa and naturalization rate was 8.2% of all 560 taxa of vascular plants. Wild plants disturbing ecosystem like Ambrosia artemisiifolia var. elatior have been increasing. Therefore, continuous control and conservation measures are needed on the ecosystem of Mt. Manduk.

• Korean Journal of Environment and Ecology
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• v.37 no.1
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• pp.13-34
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• 2023

Many ecologists try to understand plant communities and societies' changing processes by interacting with environmental factors. Plant communities formed in the sidings of streams, which are more dynamic than forest vegetation, are closely related to the disturbance regime of streams. U. pumila, which forms communities at the edges of streams, is distributed over the central and northern regions of the Korean Peninsula. In this study, we intended to explain the regeneration of U. pumila communities in the upstream region of the Namhangang River. Heights from the stream surface to the mid-high points of communities increased when the age class of U. pumila communities increased. On the other hand, the height of U. pumila tended to increase and decrease as the age class increased. The richness (S), evenness (J'), diversity (H'), and maximum diversity (H'max) also showed a tendency to increase and then decrease as the age class increased. On the other hand, the number of stems per individual and density (D) decreased as the age class increased. Seedlings of U. pumila failed to regenerate in the communities at the intermediate or higher stage of the age class. Regeneration of seedlings occurred in the spaces formed by the flooding, which occurred periodically in streams. After regeneration, U. pumila communities grew like a single organism. On the other hand, the plant species consisting of U. pumila communities exhibited a process in which the S and H' increased and then decreased as they developed. In other words, we determined that the changes in the species compositions were associated with changes in each species' environment and community. A space where seeds can regenerate seedlings should be provided for the regeneration of U. pumila communities. In the mid/upstream region of the Namhangang River, where the present study focused, newly formed communities were rare because the space required to regenerate U. pumila ceased to exist. Accordingly, we suggest securing an appropriate space for the regeneration of seedlings to maintain the U. pumila communities in the upstream region of the Namhangang River.

• Korean Journal of Applied Biomechanics
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• v.15 no.2
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• pp.41-55
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• 2005

In this study, weight carrying pattern analysis and comparison method of four foot region were suggested. We used three types of club(driver, iron7, pitching wedge). This analysis method can compare between top class golfer and beginner. And the comparison data can be used to correct the swing pose of trainee. If motion analysis system, which can measure the swing speed and instantaneous acceleration at the point of hitting a ball, is combined with this plantar foot force analysis method, new design development of golf shoes to increase comfort and ball flight distance will be available. 1. Regional change of force acting, in address, is evenly distributed on both feet. In back swing top, 76% on right foot, 75% on left foot as impact, and 86% on left foot as finish. As regional force acting, in address, pros get high marks on rare and inside of right foot and rare and outside for amateurs. In back swing top, it is higher as fore and inside of left foot, pros as rare part of right foot and amateurs as forefoot. In impact, it is higher for pros and amateurs in outside and rare part of left foot and fore and inside of right foot. In finish, for both pros and amateurs, it is higher for outside and rare parts of left foot. 2. For each club, forces are evenly distributed on both feet in address. In back swing top, the shorter a club is, the higher impact on right foot and the higher finish distribution on left foot. For all the clubs used, in each region, pros get higher on rare and inside of right foot and as amateurs on rare and outside of left foot in address. In back swing top, for all clubs, pros get higher on rare and outside of right foot as fore and outside for amateurs. In impact acting, for all clubs, rare and outside of left foot get higher. In finish, force concentrates on rarefoot. 3. On both feet force, right foot forces of amateurs is higher than those of pros in back swing top. In impact and finish, pros get higher on left foot.

• Korean Journal of Environment and Ecology
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• v.25 no.4
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• pp.447-469
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• 2011

The flora of Bongamsa (Temple) area, Mungyeong were listed 552 taxa; 99 families, 303 genera, 468 species, 1 subspecies, 70 varieties and 13 forms. Based on the rare plants (IUCN), total 12 taxa; Crypsinus hastatus (Polypodiaceae), Eranthis stellata (Ranunculaceae), Cnidium tachiroei (Umbelliferae), Monotropa hypopithys (Pyrolaceae), Rhododendron micranthum (Ericaceae), Salvia chanroenica (Labiatae), Gastrodia elata (Orchidaceae), etc. Based on the endemic plants, total 11 taxa; Asarum chungbuensis, Aconitum pseudolaeve, Corydalis maculata, Lonicera subsessilis, Aster koraiensis, Saussurea seoulensis, etc. Based on the specific plants by floral region were total 48 taxa (8.7% of all 552 taxa of vascular plants); 2 taxa in class V, 5 taxa (Cimicifuga heracleifolia, Wistaria floribunda, Elsholtzia angustifolia, etc.) in class IV, 10 taxa (Betula davurica, Spiraea chinensis, Acer barbinerve, Vaccinium koreanum, Syringa reticulata var. mandshurica, etc.) in class III, 7 taxa (Potentilla dickinsii, Viola orientalis, Ostericum melanotilingia, Melica nutans, Veratrum parulum, etc.) in class II, 24 taxa (Camptosorus sibiricus, Cephalotaxus koreana, Betula schmidtii, Ilex macropoda, Tilia amurensis, Triadenum japonica, Lobelia sessilifolia, etc.) in class I. Based on the naturalized plants, total 21 taxa (Silene armeria, Oenothera lamarckiana, Symphytum officinale, Erechtites hieracifolia, etc.) and naturalization rate was 3.8% of all 552 taxa of vascular plants. The flora of importance in the Bongamsa, rare plants were Crypsinus hastatus, Eranthis stellata, Gastrodia elata, Monotropa uniflora, Monotropa hypopithys, Rhododendron micranthum and Cnidium tachiroei, Iris ensata var. spontanea in intermediate marsh and alien species classify into planted species of Bongamsa, area for investigation of afforestation and artificial forests, introduced of naturalized plants.

• Journal of Environmental Science International
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• v.18 no.6
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• pp.633-644
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• 2009

The vascular plants in the Gyeryongsan National Park were listed 227 taxa; 71 families, 148 genera, 196 species, 1 subspecies, 26 varieties and 4 forms, Among them, trees and herbs were 103 taxa (45.4%), 124 taxa (54.6%), respectively. The rare plants were identified 6 taxa such as Paeonia obovata (Legal protection species), Viola albida, Acanthopanax chiisanensis, Lilium distichum, Lilium callosum and Goodyera schlechtendaliana by the Korea Forest Service. Based on the list of Korean endemic plants, 8 taxa were recorded; Cephalotaxus koreana, Pseudostellaria multiflora, Thalictrum uchiyamai, Indigofera koreana, Acanthopanax chiisanensis, Asperula lasiantha, Weigela subsessilis and Carex okamotoi. Based on the list of approved for delivering overseas of plants, 6 taxa were recorded; Viola albida, Acanthopanax chiisanensis, Asperula lasiantha, Carex okamotoi, Lilium distichum and Lilium callosum. Specific plant species by floral region were total 21 taxa (9.3%); Paeonia obovata in class V, 5 taxa (Betula davurica, Acer palmatum, Asperula lasiantha, Lonicera subhispida, Phaenosperma globosa) in class III, 4 taxa (Viola orientalis, Acanthopanax chiisanensis, Ostericum melanotilingia, Lilium distichum) in class II and 11 taxa (Cephalotaxus koreana, Betula schmidtii, Quercus variabilis, Aphananthe aspera, Ilex macropoda, Meliosma oldhamii, Tilia amurensis, Lilium callosum, Erythronium japonicum, Polygonatum inflatum, Hosta capitata) in class I. It is important that relationship between national and local government will be needed for preservation of natural environment of Gyeryongsan National Park. As well, a long time of monitering and systematical management counterplan will be required.

• Journal of the Korean Society of Environmental Restoration Technology
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• v.9 no.4
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• pp.13-23
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• 2006

The vascular plants of the studied area in the Mt. Bangjang was listed 422 taxa : 106 families, 299 genera, 372 species, 1 subspecies, 46 varieties and 3 forms. Based on the list of the rare plants by the Forest Research Institute, 5 taxa were recorded in the studied areas; Lilium distichum(Preservation priority order : No. 159), Tricyrtis dilatata (No. 97), Aristolochia contorta (No. 151), Prunus yedoensis (No. 110), Patrinia saniculaefolia (No. 122) and based on the list of Korean endemic plants, 9 taxa were recorded; Cephalotaxus koreana, Carex okamotoi, Populus tomentiglandulosa, Salix purpurea var. japonica, Prunus yedoensis, Forsythia koreana, Paulownia coreana, Weigela subsessilis, Patrinia saniculaefolia. Specific plant species by floral region were total 29 taxa; Prunus yedoensis in class V, 3 taxa(Acer palmatum, Asperula lasiantha, Lonicera subhispida ) in class III, 5 taxa(Lilium distichum, Potentilla dickinsii, Caryopteris incana, Patrinia saniculaefolia, Ligularia fischeri) in class II, 20 taxa(Ulmus parvifolia, Clematis patens, Aconitum jaluense, Ilex macropoda, Grewia biloba var. parviflora etc.) in class I. The naturalized plants in this site were 13 families, 31 genera, 36 species, 2 varieties, 38 taxa and naturalization rate was 9.0% of all 422 taxa vascular plants. Because of recent rapid increase of cars and people around here, analysis shows many naturalized plants and high naturalized ratio. And wild plants disturbing ecosystem like Ambrosia artemisiifolia var. elatior have been increasing. So, it needs continuing control and conservation measures on the plant ecosystem.

• Journal of the Korean Society of Environmental Restoration Technology
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• v.15 no.1
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• pp.35-51
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• 2012

The vascular plants in Bukhansan Dulegil, Jingwan-dong Wetland and Bukhan-dong Cheolgeoji were listed 432 taxa (8.9% of all 4,881 taxa of vascular plants); 95 families, 274 genera, 345 species, 2 subspecies, 69 varieties and 16 forms. Divided into woody plants were 145 taxa (33.6%) and herbaceous plants were 287 taxa (66.4%). The Bukhansan Dulegil were listed (Myeongsang-gil 159 taxa, Huingureum-gil 227 taxa, Wooyiryeong-gil 216 taxa, Banghakdong-gil 139 taxa, Boru-gil 199 taxa), Jingwan-dong Wetland were listed 147 taxa and Bukhan-dong Cheolgeoji were listed 129 taxa. Based on the list of rare plants by Korea Forest Service and Korea National Arboretum were Viola albida Palibin (Violaceae), Iris minutiaurea Makino (Iridaceae) and Korea National Arboretum were endemic plants, Philadelphus schrenkii Rupr. var. schrenkii (Saxifragaceae), Weigela subsessilis L.H. Bailey (Caprifoliaceae). Based on the list of floristic regional indicator plants by Korean Ministry of Environment were total 22 taxa; Wisteria floribunda DC. for. floribunda in class IV, 3 taxa (Betula davurica Pall., Mukdenia rossii Koidz., Glechoma grandis Kuprian., etc.) in class III, 5 taxa (Acer triflorum Kom., Viola orientalis W. Becker, Heloniopsis koreana Fuse & Al., etc.) in class II and 13 taxa (Camptosorus sibiricus Rupr., Clematis patens C. Morren & Decne., Cirsium pendulum Fisch. ex DC., etc.) in class I. Based on the list of naturalized plants, 16 families, 35 genera, 37 species, 3 varieties, 1 form, total 41 taxa (Rumex crispus L., Abutilon theophrasti Medicus, Panicum dichotomiflorum Michx. etc.), naturalization rate was 9.5% of all 432 taxa of vascular plants and urbanization index was 13.3% of all 309 taxa of naturalized plants. Ecosystem disturbing wild plants were 5 taxa; Rumex acetocella L., Ambrosia artemisiifolia L., Ambrosia trifida L. var. trifida, Eupatorium rugosum Houtt., Aster pilosus Willd.

• Journal of the Korean Society of Environmental Restoration Technology
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• v.14 no.2
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• pp.59-81
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• 2011

The flora of the Sinpyeong and Churyeong stream were listed 324 taxa; 87 families, 227 genera, 289 species, 1 subspecies, 31 varieties and 3 forms. The Sinpyeong stream were 249 taxa and Churyeong stream were 221 taxa. Based on the rare plants (IUCN) by the Korea Forest Service and Korea National Arboretum were recorded; Penthorum chinense (Crassulaceae), etc. and endemic plants, 6 taxa; Weigela subsessilis (Caprifoliaceae), Lycoris flavescens (Amarylidaceae), etc. Based on the specific plants by floral region were total 12 taxa (3.7% of all 324 taxa of flora); Monochoria korsakowi (Pontederiaceae), etc. in class III. 10 taxa (Salix glandulosa (Salicaceae), Ulmus parvifolia (Ulmaceae), Impatiens noli-tangere (Balsaminaceae), Grewia biloba var. parviflora (Tiliaceae), Nymphoides peltata (Gentianaceae), Actinostemma lobatum (Cucurbitaceae), Cirsium pendulum (Compositae), Microstegium japonicum (Gramineae), etc.) in class I. Based on the naturalized plants, 51 taxa and ecosystem disturbing wild plants, 6 taxa (Rumex acetosella, Sicyos angulatus, Aster pilosus, Ambrosia artemisiaefolia, Hypochaeris radicata, Paspalum distichum var. distichum) and naturalization rate was 15.7% of all 324 taxa of flora, urbanization index was 18.8% of all 271 taxa of naturalized plants. Based on the hydrophytes, 23 taxa and emergent hydrophytes were 17 taxa, floating-leaved hydrophytes were 3 taxa, submergent hydrophytes were 2 taxa, free-floating hydrophytes was Spirodela polyrhiza.

• Resources Recycling
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• v.27 no.3
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• pp.8-15
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• 2018

Solvent extraction behavior of light rare earth elements (Pr, Nd) and medium rare erath elements (Tb, Dy) in the HCl-PC88A-kerosene extraction system was investigated in order to separate high-purity light rare earths (Pr, Nd) and medium rare earths (Tb, Dy) in the mixed rare earth chloride solution. In the batch test step, it was confirmed that the separation efficiency was good when the extractant concentration (PC88A) was 0.5 M, the equilibrium pH after extraction was 0.8 to 1.0 (initial pH 1.3 of the feed), the concentrations of hydrochloric acid in scrubbing solution was set as 0.1 M, the concentrations of hydrochloric acid in stripping solution was set as 2.0 M or more. Based on the experimental data obtained from the batch test, the mixer-settler was composed as follows; 4 stages of extraction, 8 stages of scrubbing, 4 stages of stripping, and 3 stages of pickling organic solution. The Mixer-settler was operated for 180 hours, and the operating conditions were continuously adjusted to obtain the high-purity light/medium rare earths. Finally, the purity of light (Pr, Nd) and medium rare earth elements (Tb, Dy) was reached as 3 N class.

• The Bulletin of The Korean Astronomical Society
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• v.42 no.1
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• pp.46.1-46.1
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• 2017

Class I methanol masers are found to be good tracers of the interaction between outflows from massive young stellar objects with their surrounding media. Although polarization observations of Class II methanol masers have been able to provide information about magnetic fi elds close to the central (proto)stars, polarization observations of Class I methanol masers are rare, especially at 44 and 95GHz. We present the results of linear polarization observations of 39 Class I methanol maser sources at 44 and 95GHz. These two lines are observed simultaneously with one of the 21m Korean VLBI Network telescopes in single-dish mode. Approximately 60% of the observed sources have fractional polarizations of a few percent in at least one transition. This is the fi rst reported detection of linear polarization of the 44GHz methanol maser. We also observed 7 targets with the KVN in VLBI mode. We will present its preliminary results, too.