• Journal of Korean Society of Forest Science
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• v.111 no.4
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• pp.511-529
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• 2022

The forest vegetation of the Korean Peninsula is dominated by deciduous Fagaceae forests. The study aimed to comparethe correlation between species composition and environmental factors in Namsan, Odaesan, and Ulleungdo. A vegetation survey of 75 sites was conducted from May to August 2018. Seven vegetation types were classified. The inland representative vegetation was classified as a Quercus mongolica community, and the island representative vegetation was classified as a Fagus multinervis community. The Quercus mongolica community was subdivided into the Aria alnifolia group, representative of cities, and the Tilia amurensis group, representative of mountainous regions. Analysis of important values and indicator species to examine the succession trends according to regional types showed that urban and island forestswere maintained as Fagaceae communities, and that mountainous region foreststransitioned to broadleaf species, such as Tilia amurensis and Carpinus cordata. A CCA analysis of vegetation type and site environmental factors showed that altitude had the biggest effect on species composition at the same latitude. The study results should contribute to a better understanding of the Korean Peninsula forest ecosystem characteristics and provide basic data for establishing a systematic conservation and restoration plan.

• Korean Journal of Environment and Ecology
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• v.38 no.4
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• pp.405-415
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• 2024

The bioacoustics generated in urban parks contribute to the overall sound diversity of a city, creating a harmonious acoustic environment and maintaining the balance of the soundscape. However, due to the rapid urbanization process, the acoustic environment in urban parks is continuously deteriorating due to increased noise. In this study, we present an approach to monitoring the acoustic environment of urban parks by analyzing the soundscape of Namsan Urban Natural Park in Seoul. Acoustic data were collected continuously for one month from August 2021 in four facility districts of the study site using autonomous recording units, and a total of 2,784 hours of sound material were obtained. We also compared soundscape characteristics over time in each district using acoustic indices (ACI, ADI, BI, NDSI) representing soundscape complexity, acoustic diversity, degree of bioacoustics, and anthropogenic disturbance. The results showed that acoustic indices related to bioacoustics varied between districts, but most indices showed similar variation patterns due to the influence of anthropogenic sounds. In particular, regional differences closed during periods of high bird activity but not during periods of high human activity. We suggest that considering both acoustic characteristics and multiple acoustic indices is necessary for managing the soundscape of urban parks. The results of this study are expected to provide essential data for assessing the health of urban ecosystems based on soundscapes and to be used for monitoring the acoustic environment of urban parks.

• Journal of Environmental Health Sciences
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• v.20 no.2
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• pp.55-63
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• 1994

While environmental pollution being developed, there have been some cases that residents on certain parts of Seoul area have cultivated vegetables in a small scale, and consumed the produce of theirs thinking them not polluted. Therefore the need for study about whether those vegetables and soil were polluted was growing. In this study, Seoul area (Tobong-dong, Chang-dong, Wolgyedong, P'il-dong, Oksu-dong, and Karibong-dong) and Kyanggi area (Changhang, P'och'an, Kap'yang, Yangp'y~ng) where pollution was thought to be less severe than that of the former were selected for the sampling area. Cabbage, pumpkin and young pumpkin were sampled and dried to be analyzed the contents of Cd, Cr, Cu, Ni, Pb, Zn, and moisture content was also analyzed. And at the same time 0.1 N-HCl soluble heavy metal content of soil was measured, and the results obtained were descrived as follows. Heavy metal contents of soil in Seoul and Kyonggi were Cd 0.184 ppm, 0.118 ppm, Cr 2.355 ppm, 0.441 ppm, Cu 29.16 ppm, 3.331 ppm, Ni 1.650 ppm, 0.829 ppm, Pb 26.77 ppm, 4.696 ppm, Zn 57.47 ppm, 14.94 ppm respectively. Heavy metal contents of cabbage in Seoul and Kyonggi were Cd 0.407 ppm, 0.241 ppm, Cr 0.388 ppm, 0.402 ppm, Cu 6.853 ppm, 4.486 ppm, Ni 1.479 ppm, 0.878 ppm, Pb 0.812 ppm, 0.258ppm, Zn 112.2 ppm, 54.86ppm respectively. Heavy metal contents of pumpkin in Seoul and Ky6nggi were Cd 0.011 ppm, 0.011 ppm, Cr 0,262 ppm, 0.197 ppm, Cu 3.302 ppm, 2.539 ppm, Ni 0.717 ppm, 0.369 ppm, Pb 0.257 ppm, 0.083 ppm, Zn 28.75 ppm, 14.01 ppm respectively. Correlation between heavy metal contents of soil and those of vegetables was represented high as a whole. In all heavy metals cabbage had higher values of concentrations than those of pumpkin (p<0.001). Concentrations of young pumpkin were higher than those of big pumpkin. It was probably due to the fact that young pumpkin containing not only inner part of pumpkin but also seeds was used as a sample. When classified by region, relatively high concentrations were observed in the samples of Karibong-dong, and in the sample of Jungtang riverside Cd was higher, and in the sample of Namsan Pb was higher than any other district.

• The Journal of Engineering Geology
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• v.25 no.4
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• pp.459-472
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• 2015

A recently developed tunnel section enlargement method can maintain traffic flow during construction by using a protector. By keeping traffic flowing, it can minimize the lost time and costs associated with diversions and also the accompanying environmental pollution. On the other hand, installing the protector can lengthen the construction period and increase the direct cost. This paper presents a method for analyzing the economic feasibility of tunnel section enlargement methods considering the direct construction cost and the indirect social cost. The indirect costs are divided into categories of: vehicle driving cost, travel time delay cost, and environmental pollution cost. The economic efficiency of existing technology is compared with the new method in an case study of Namsan Tunnel 3.

• The Korean Journal of Mycology
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• v.27 no.2 s.89
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• pp.124-131
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• 1999

This study was carried out to identify the phylogenetic relationship among Phellinus species by comparing the DNA sequences of the 5.8S ribosomal DNA (rDNA) and the internal transcribed spacers (ITSs), ITS1 and ITS2 regions. Two primers from the 3' end of 18S rDNA and the 5' end of 28S rDNA sequences were chosen to amplify the specific ITS regions of Phellinus spp. Phellinus strains used in the study were divided into four clusters by the phylogenetic tree based on the amplified regions of ITS and 5.8S rDNA sequences. The first cluster consist of Phellinus hartigii IMSNU 32041 and Phellinus robustus IMSNU 32068, and the second cluster consists of Phellinus linteus strains and Phellinus weirianus IMSNU 32021. Phellinus laevigatus KCTC 6229, KCTC 6230 and Phellinus igniarius KCTC 6227, KCTC 6228 belong to the third cluster. Finally, Phellinus chrysoloma KCTC 6225 and Phellinus chrysoloma KCTC 6226 are the fourth cluster. In the second cluster the differentiation between Phellinus linteus strains and Phellinus weirianus species were not possible by the comparison of the ITS sequences. These results revealed that Phellinus linteus and Phellinus weirianus cannot be established the concept of species level only by the ITS sequences. Therefore, both physiological and molecular biological methods as well as the sequences of type strains are necessary to classify the strains of these two species accurately. The comparison of the ITS sequences of four Phellinus species indicated that the sequences of the ITS1 generally are more divergent than those of the ITS2. Although the ITS sequences are varied in some species, the conserved regions in both ITS1 and ITS2 are useful tool to differentiate the species. Phellinus linteus and related species have their specific sequences in the ITS1 compared to the other species.

• Journal of Preventive Medicine and Public Health
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• v.18 no.1
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• pp.137-147
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• 1985

To assess the childhood immunization level of urban and rural areas, 250 mothers of $6{\sim}23$ months old children residing in Namsan 1 Dong, Taegu, and 264 mothers of the same age children residing in five areas of Kyungsan Gun where community health practitioners are assigned were interviewed in March, 1984. Immunization rate for BCG was 98.0% in urban area and 95.8% in rural area. Among children who had BCG vaccination 91.4% of them were immunized within 1 month after birth in urban area and 88.1% in rural area. The percentage of children who received three doses of DPT vaccine was 83.2% in urban, and 87.5% in rural area ana that for the polio vaccine was 80.8% in urban and 87.9% in rural area. Only a few children have never been immunized with either BCG or DPT or polio vaccine. Overall immunization rate for measles was 64.4% in urban area while it was 55.3% in rural area and that for mumps and rubella was 50.4% in urban area as compared with 36.0% in rural area. However, among children of 15 months old and above the percentage of measles vaccination was 85.3% in urban area and 73.7% in rural area. Mumps and rubella vaccination rate was 77.6% in urban area and 62.4% in rural area. These differences in measles, mumps and rubella vaccination rates between urban and rural areas were statistically significant (p<0.05). Such findings as improved immunization level, no significant differences in BCG, DPT and polio vaccination rate between urban and rural areas, and fewer mothers in rural area have not vaccinated their children than mothers in urban area because of their ignorance may be attributed to the general improvement of living standard and implementation of the maternal and child health services of the government. Nevertheless many of the mothers in rural as well as urban area have not immunized their children on time and measles, mumps and rubella vaccination rates are substantially lower than other childhood immunizations. Future immunization activity should be geared to reinforcing these areas.