• Journal of Korean Society of Forest Science
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• v.98 no.3
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• pp.339-350
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• 2009

This study was carried out to investigate distributional condition of rare plants and useful plant resources, and to verify distributional patterns of understory vegetation associated with the upper layer's vegetation structure. Total 59 families, 160 genera, 218 kinds of vascular plants were identified at the study site including 6 rare plants designated by Korea Forest Service (Lloydia triflora Bak., Trillium kamtschaticum Pall., Lilium distichum Nakai, Anemone koraiensis Nakai, Iris odaesanensis Y.N. Lee, Viola diamantica Nakai). Twenty three species of useful plant resources were also identified at the site; 8 of them showed clustered distributions and the others were prone to scatter. Actual vegetation of this study area consisted of one natural community dominated by Quercus mongolica Fisch. and three disturbed communities of Larix kaempferi (Lamb.) Carriere, Abies holophylla Max. and/or a herbaceous vegetation resulting from forest removal and strong wind of mountain top. This classification was strongly supported by cluster analysis based on the surveyed plot data. Distributional patterns of understory vegetation within forest stand were somewhat related to overstory vegetation structure, but showed a different tendency according to site condition, species composition, and competitive pressure among understory vegetation. Therefore, in order to protect the important understory components as forest genetic resources, forest treatments such as density control of overstory should be implanted based on understanding of impact on understory's dynamics and growing condition.

• Korean journal of applied entomology
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• v.13 no.1 s.18
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• pp.19-23
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• 1974

Since Tongil has been cultivated widely in farmers' fields, the variety is known to be highly resistant to existing races of Pyricularia oryzae in Korea. However, Tongil and the sister lines were moderately susceptible to race IA-65, which was isolated from Tongil at the blast nursery of the College of Agriculture, Seoul National University, 1972. In field tests of 1973, pathogenic reactions of IR lines at the isolated nursery, where IA-65 had been inoculated, were significantly higher than those at the farm nursery. When seedlings of 196 IR lines were inoculated with IA­65, about $30\%$ of the IR lines including IR667-98 were moderately susceptible. Among the 30 isolates of P. oryzae obtained mostly from indicas, 12 were also differentiated in 1973 as IA group known to be the most prevalent races at IRRI in the Philippines, where Tongil has been highly susceptible. This IA group was also pathogenic to Tongil in greenhouse experiments. The race group causing moderately susceptible to Tongil should be new in Korea, since no occurrences of the race IA have ever been reported previously from the areas where japonica types of rice are cultivated. Because some races of P. oryzae present in Korea are pathogenic to Tongil and because these races may become prevalent in the fields, the reaction of Tongil must be continuously monitored.

• The Korean Journal of Ecology
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• v.28 no.1
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• pp.15-23
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• 2005

The black locust (Robinia pseudoacacia L.) forests were studied by a phytosociological approach. Particular attention was given to characterize the vegetation classification, distribution pattern, and ecological flora of the syntaxa classified. A total of 38 releves were analyzed by using Correlation coefficient, UPGMA as the clustering method, and Principal Coordinates Analysis for ordination. Ecological flora analyzed by plant character sets such as scrambler, annual and biennial plants, forest elements, and actual urbanization index. The analyzed data are based on site-releve matrix with relative net contribution degree (r-NCD) of species. A total of 77 families, 193 genera and 323 species of vascular plants are recorded. Camellino-Robinietum pseudoacaciae ass. nov. and Phragmites-Robinia pseudoacacia community were described. Main cluster and ordination could be separated: 1) urban type, 2) rural type, 3) riparian type, and 4) combined type. It is defined that the Robinietum is a representative unit on the black locust afforestation, Phragmites-Robinia community on the lentic zone in the river ecosystem, and Cameliino-Robinietum ailanthetosum altissimae as an urban forest type. The Robinietum was considered as a perpetual community.

• Korean Journal of Social Welfare
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• v.56 no.2
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• pp.237-259
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• 2004

The public assistance scheme plays more important role in income maintenance for poor elders than the public pension does due to insufficient coverage of the public pension resulted from late introduction of it in Korea. However, only limited numbers of poor elders are financially protected by the public assistance contrary to the general perception that the elderly population most benefits from public aids. Based on data set of 2000 from the Korean Labor and Income Panel Study, this study analysed the size, composition and characteristics of poor elders excluded from the public assistance, and determinants of the elderly's participation in it. Findings of the study can be summarized as follows: (1) More than half of poor elders are excluded from the public assistance although their economic status is similar with that of recipients, which may cause income reversal between recipients and non-recipients. (2) It was identified that non-recipient poor elders especially those with same income level of recipients of the National Livelihood Guarantees(NLG) are actually in desperate need of public aids considering their serious financial conditions. (3) Participation in public assistance among the elderly is more affected by socio-demographic factors that reflect family conditions than by economic factors, which is mostly caused by the strict eligibility criteria of the public assistance that reinforces family duty of financial support for elderly relatives in Korea. Policy implications for more effective income security for poor elders include revising inappropriate eligibility criteria of the NLG concerning family obligations, expanding the coverage of the old age allowance for poor elders to near-poor elders, and providing work opportunities to non-recipient poor elders to supplement their income deficit.

• Journal of Korean Tunnelling and Underground Space Association
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• v.15 no.5
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• pp.497-504
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• 2013

This research uses numerical analysis to examine the tunnel portal landscape affecting the brightness level of interior lighting when designing lights for road tunnels through the L20 method. In order to extract the brightness recognition per form of a tunnel entrance and to evaluate the effects of the characteristics of the materials of facilities near a tunnel portal, brightness analysis was conducted by filming brightness on a video photometer called Hi-land Elf System, and a surface brightness photometer called LMK Mobile Advanced. Tunnels in Korea are mostly distributed in mountain areas; thus, the ratio occupied by the sky, which has the highest brightness within the angle of L20, is close to zero, while most of the ratio was occupied by brightness by the area near the tunnel entrance or road surface. However, for a tunnel portal retaing wall, which allows the width of a tunnel entrance to seem wider within the L20 angle, appeared to be have higher brightness compared to nearby areas or the surface, which is an element increasing the tunnel portal brightness within the tunnel, and the road facilities near the tunnel portal appeared to have an effect on the brightness as well. Thus, when designing tunnel lights based on brightness, the form of the tunnel entrance and the area width, material, and color of areas near the tunnel portal appeared to affect outside brightness and become an element affecting the establishment of the brightness level of the interior lights of tunnels. Consequently, reviewing such matters is a prerequisite when designing tunnel portal landscape.

• Journal of the Korean Geophysical Society
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• v.2 no.3
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• pp.179-190
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• 1999

The overall structural framework was studied using the regional 2D seismic data, followed by the sequence stratigraphic study on the 3D seismic and well- log data in the margin of the South Con Son basin of the South China Sea. This research contributes to delineate depositional stratigraphy, depositional environment and geologic history in the 3D seismic area of highly complicated faulting. Eight Miocene sequences were indicated on the 3D seismic and well-log data, in which the structural maps of each sequence boundary and the isochron maps for the corresponding sequence were made. The seismic facies were analyzed for each sequence volume and sequence boundary surface. The 3D seismic area is characterized by coal beds deposited in the transgression environment (transgression systems tract) and channel distributions just above the sequence boundaries. During the Early Miocene, the coals and thick shales deposited in the mangrove swamp representing the lower coastal plain environment. During the Mid to Late Miocene, thick clastic sediments deposited in the coastal to shallow shelf by regional subsidence and marine transgression. The isochron maps and structural patterns indicate that the sediments were transported from west to east or from northwest to southeast.

• Journal of the Society of Cosmetic Scientists of Korea
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• v.30 no.3 s.47
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• pp.313-320
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• 2004

Human skin is continuously exposed to internal and external influences that may affect its condition and functioning. To maintain and improve skin condition, a wide variety of skin-care products is in the market. However, many of skin problems originate from internal causes, and the new insight into the relation between nutritional factors and skin is now receiving a great attention. Specific positive effects of nutrients or nutraceutical compounds on skin conditions may prove to be biologically relevant and may consequently allow for claims on products containing these compounds, resulting in the development of new functional food for optimal skin condition. In this review, these functions of nutrients and nutraceutical compounds in skin are summarized as providing a basis for the feasibility of the concept of functional foods for maintaining and improving skin condition.

• Korean journal of applied entomology
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• v.13 no.4 s.21
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• pp.217-225
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• 1974

The damage by fruit-piercing moths in orchards, primarily on grapes cultivated on reclaimed hillsides in Koksung, Cholla Namdo, was surveyed during July to October, 1974. Moths collected at night, mostly with the aid of flash light, were then classified. Results are summairzed as follows; 1. In addition to the 14 species of fruit-piercing moths reported in Korea, 11 new species were collected lot the first time ia Korea. These include. Speiredonia retorta Clerck, Cocytodes coerulea Guenee, Metopta rectifasciata Menetries, Ophideres fullonica Linnaeus, Serrodes campana Guenee, Mythimna turca Linnaeus, Amphipyra livida Schiffermuller et Denis, Paralleia maturata Walker, Ophiusa tirhaca Cramer, Anomis mesogona Walker and Thyas dotata Fabricius. 2. The maximum emergence of moths in Koksung Orchard was from the 10th to the end of September. Only a few moths were observed befroe the begining of August or after October 10. 3. The number of moths flying to grape vines increased as the time advanced from sunset to midnight. Populations gradually decreased thereafter until 5:30 a. m., when only occasional moths were observed. 4. Average damage to grape fruits by these insects was virtually nil until August 10; with subsequent infestation rates of $1.0\%$ on August 15, $17.6\%$ on September 26, and $20.3%$ on October 4, respectively. 5. Fruits of less than 10 percent sugar content and higher than 6.2 acid value were free from damage by these moths, and those of higher sugar content and lower acid value to be more heavily attacked.

• Journal of Plant Biology
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• v.1 no.2
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• pp.7-15
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• 1958

1. The author investigated on the flora of Yongzong island especially on the point of view of the sociological studies. 2. The author could distinguish kinds of the plant formtion in this island(1). Seaside plant formation (2). Mountain plant formation. 3. The seaside plant formation could be subdivided as follows: (1). Association of Triglochin maritimum LINNE. (2). Association of Suaeda japonica MAKINO. (3). Association of Scirpus triqueter LINNE. (4) Association of Phragmites prosturatus MAKINO. (5). Association of Zoysia japonica STEUDEL. (6). Association of Zoysia sinica HANCE var. tenuis NAKAI ex YAMAMOTO. (7). Assocation of Carex pumila THUNBERG. (8). Association of Rosa rugosa THUNBERG. (9). Association of Pinus Thunbergii PARLATORE. (1), (2), (3), (4), (5) associations can grow under the high tide, so when the high tide comes they soaked in the sea water. 4. The mountain plant formation can be subdivided as follows: (1). Association of Quercus aliena BLUME and Platycarya strobilacea STEBOLD & ZUCCARINI. (2). Association of Quercus acutissima CARRUTHERS and Platycaryastrobilacea SIEBOLD & ZUCCARINI. (3). Association of Robinia Pseudoeacia LINNE and Platycarya strobilacea SIEBOLD & ZUCCARINI. 5. The plants at the abandoned mine regions are replacing by the association of Robinia Pseudacacia LINNE and Platycarya strobilacea SIEBOLD & ZUCCARINI. 6. Generally I can find that soil which is developed by the seaside plant formation under sea water (when high tide comes, they soaked in the sea water) is over the pH 8.0, so it shows strong alkaline. But the sandy soil behind the tide line shows near the neutral in spite of the same seaside plant formation. In the case of mountain plant formation the soil where they developed show near the pH 6.0, so it is acidity.

• Geophysics and Geophysical Exploration
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• v.14 no.3
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• pp.227-233
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• 2011

Attention has been focused on geothermal energy as an alternative energy because it is continuously operable without external supply. Most of geothermal anomalies in Korea are related to deep circulation of groundwater through a fracture system in granite area. Therefore it is very important to understand the distribution of the fracture system which is the main channel of ground water. In this research, we constructed the velocity models with a fracture system and the layered sediments, respectively, and generated synthetic data sets with them to verify the presented vertical seismic profiling (VSP) preprocessing scheme. We compared the results from conventional VSP preprocessing flow to those from VSP preprocessing flow considering fracture system. We noticed that the preprocessing flow considering fracture system retains more sufficient signal including down-going wave than conventional preprocessing. In addition, we applied 3D VSP prestack phase screen migration to the preprocessed reversed VSP (RVSP) data from Seokmo Island so that we were able to image fracture structure of the geothermal site in Seokmo Island.