• Journal of applied mathematics & informatics
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• v.26 no.1_2
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• pp.337-347
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• 2008

Based on social welfare maximum theory, the optimal scale of power plants entering generation power market being is researched. A static non-cooperative game model for short-term optimization of power plants with different cost is presented. And the equilibrium solutions and the total social welfare are obtained. According to principle of maximum social welfare selection, the optimization model is solved, optimal number of power plants entering the market is determined. The optimization results can not only increase the customer surplus and improve power production efficiency, but also sustain normal profits of power plants and scale economy of power production, and the waste of resource can also be avoided. At last, case results show that the proposed model is efficient.

• Journal of Species Research
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• v.1 no.2
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• pp.232-239
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• 2012

Taxonomy of umbelliferous taxa Heracleum moellendorffii complex has been unclear in their species delimitation in the far-eastern Asian regions. In both Korea and China Heracleum moellendorffii was adopted for their description while H. sphondylium was chosen to describe Japanese Heracleum. From Genbank accessions, taxa collected from Kamtchatka and Promorskiy, Russia were defined as H. maximum, endemic taxon to North America. In this study, we reviewed the taxonomy of Heracleum moellendorffii complex in Korea and neighboring countries on the basis of molecular phylogenies derived from sequences of nuclear ribosomal DNA internal transcribed spacer (ITS) regions. From three Korean accessions of Heracleum investigated in this study, two types of ITS sequences were obtained; two accessions were related to Chinese H. moellendorffii var. moellendorffii and North American H. maximum without forming a clade while the other one was identical to accession from H. maximum from Primorskiy, Russia. In the other hand, Japanese H. moellendorffii (=H. sphondylium ssp. sphondylium var. nipponicum in the flora of Japan) was closely related to H. maximum accessions from Korea and Russia, not nested within the clade comprising several subspecies of H. sphondylium. In order to delimit species boundaries among putatively closely related Heracleum species in fareastern Asian countries, more samples and much more rapidly evolved DNA regions must be investigated with interpretation of morphological and anatomical features.

• Korean Journal of Environment and Ecology
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• v.11 no.3
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• pp.270-276
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• 1997

The purpose of this study was to investigate the number of climbing plant species habitated in South Korea. Relationships between their distribution and environmental factors were surveyed. Research sites for vertical distribution were Mt.S rak, Mt.Kwangkyo, Mt. Eoudap and Mt. Chiri. The results of this study are as follows: The number of climbing plants habitated in South Korea was 267 species, 95 genera, 41 families. According as latitude lower, the number of climbing plant species increased. And most areas of Korean peninsula except for alpine regions and the northern part of North Korea seemed to be suited for the growth of climbing plants. The number of climbing plant species decreased with its altitude. And it is confirmed that their distributions were limited to the below of 1,500m sea level which was applicable to the area of Kira's warmth index above 45. The species of climbing plants changed with its plant community although at same altitude. The number of climbing plant species was different from the face of slope, and the species diversity became lower at south slope than that of north slope.

• Korean Journal of Plant Taxonomy
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• v.49 no.4
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• pp.380-384
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• 2019

A newly naturalized plant, Viola palmata L., was found in Uljin-gun, Changwon-si, and Yangsan-si. It belongs to the subsect. Boreali-Americanae (W. Becker) Gil-Ad of the sect. Nosphinium W. Becker, which is known to be from North America, with subsequent introduction into Europe. In Korea, this species is considered to have been introduced by freight transportation through the port of Busan, after which its distribution area expanded. We propose the new Korean name 'Chang-won-je-bi-kkot' based on the location at which it was initially collected in Korea. We also provide descriptions of the morphological characters along with photographs, illustrations, and a distribution map of Viola palmata.

• Journal of Plant Biology
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• v.33 no.3
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• pp.173-182
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• 1990

To investigate the structure of the plant community structure of Mt. Yongmun in Kyonggi-do, fifty-four plots were set up by the clumped sampling method. The classification by TWINSPAN and DCA ordination were applied to the study area in order to classify them into several groups based on woody plant and environmental variables. By both techniques, the plant community were divided into two groups by the aspect. the dominant species of south aspect were Pinus densiflora, Quercus aliena, Q. mongolica, Carpinus laxiflora and of north aspect were Q. ongolica, Fraxinus rhynchophylla. The successional trends of tree species in south aspect seem to be from P. densiflora through Q. serrata, Q. aliena, A. mongolica to C. laxiflora. As a result of the analysis for the relationship between the stand scores of DCA and environmental variables, they had a tendency to increase significantly from the P. densiflora and Q. mongolica community to C. laxiflora and F. rhynchophylla community that was the soil moisture, the amount of soil humus and soil pH.

• Journal of Veterinary Science
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• v.22 no.2
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• pp.26.1-26.6
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• 2021

Fourteen African swine fever (ASF) outbreaks occurred in the pig farms in the northwestern region of South Korea, near the border with North Korea, from September 16, 2019 to October 9, 2019. Active and passive surveillance on the ASF-infected farms indicated that the infection was limited only to pigsties where the infected pigs were detected on the farm for the first time before further transmission to other pigsties and farms. This early detection could be one of the pivotal factors for the prompt eradication of ASF in domestic pig farms within 1 month in the northwestern region of South Korea.

• Korean Journal of Plant Resources
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• v.36 no.3
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• pp.219-224
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• 2023

Melilotus dentatus (Waldst. & Kit.) Desf. is an invasive plant native to Europe, Russia, Uzbekistan, Mongolia and China. It was introduced to North America to create grazing areas for livestock; its growth has since become uncontrollable. Melilotus dentatus is now found in Namyang-eup, Hwaseong-si, Gyeonggi-do, South Korea as an alien plant. This species is morphologically similar to Melilotus suaveolens Ledeb. and Melilotus officinalis (L.) Lam. M. dentatus differs from other species based on its oblong leaflets, distinct teeth, two ovules, surface of the legume that is minutely reticulate-nerved or smooth, and seeds that are dark green to greenish brown. Here, we have provided a detailed description and photographs of the alien species M. dentatus as well as an updated key to five Melilotus taxa studied, which will help prepare a continuous monitoring and management plan.

• Korean Journal of Oriental Medicine
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• v.9 no.1
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• pp.81-89
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• 2003

Polygoni multiflori Radix has been used as a tonic medicine. In Korea, Cynanchi wilfordii Radix have been used too. Their names are resembled, but their plant origines are different. Polygoni multiflori Radix is called 何首烏 or 赤何首烏, and Cynanchi wilfordii Radix is 白何首烏 or 白首烏. They are suggested that they had been confused using at the early days in drug history. Polygoni multiflori Radix is enclosed in the pharmacopoeias of Korea, North Korea, Chinese and Japan. The nomina of pharmacopoeias are 赤何首烏 at North Korea and 何首烏 at other countries; Korea, Chinese and Japan. Cynanchi wilfordii Radix is just enclosed in Korea and North Korea. It means that Cynanchi wilfordii Radix has been commonly prescribed in Korea and North Korea than other countries. The nomina of pharmacopoeias are 白首烏 in Korea and 白何首烏 in North Korea. The characteristics of 何首烏 in ancient herbal records are confused of Polygoni multiflori Radix and Cynanchi wilfordii Radix. But Polygoni multiflori Radix is fixed at 何首烏 later. In Korea (south and north) Cynanchi wilfordii Radix has been recorded to using in 東醫寶鑑 that was Korea traditional Medicinal book and wrote at 1613. The 白首烏 is named in chinese about 20 century, but 白何首烏 is in korea about 19 century. In these consequences, prescription of Cynanchi wilfordii Radix in Korea is earlier than Chinese and Japan, and more common consumption too. So the nomen of 白何首烏 is better properly than 白首烏 in Korean Herbal pharmacopoeia.

• Journal of Plant Biology
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• v.31 no.1
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• pp.51-68
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• 1988

To clarity the species of genus Melandrium (Caryophyllaceae) in Korea, the taxonomic characters were described and interspecific relationships were discussed to the extemal morphology with light and scanning electron microscopy. The position and size of appendages on petal, the shape and venation pattern of leaf, and the external morphology of seed and pollen were approved as the good characters to classify genus Melandrium in Korea. As the result, genus Melandrium in Korea could be arranged as 6 species, 1 variety, 1 forma. M. umbellatum was exclusively distributed in north Korea, and its taxonomic treatment was reserved.

• Proceedings of the Korean Society of Crop Science Conference
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• 2022.10a
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• pp.295-295
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• 2022