• Land and Housing Review
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• v.12 no.4
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• pp.81-92
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• 2021

This study investigates whether urban expansion can act as a cause of the decline of the original city center through the Space Syntax methodology. The urban spatial structure analysis was conducted targeting the downtown area of Jeju-eupseong. The time points for longitudinal analysis were set at five points between 1914 and 2021 including the Japanese colonial period when the cadastral map was drawn up in Jeju City, and the urban spatial structure was analyzed and compared for each time point. ASA (Angular Segment Analysis) was used as a technique for urban spatial structure analysis. This study shows that urban expansion is a cause of the decline of the original downtown. The original city center has moved away from the center as the urban structural change due to the urban expansion. The urban structure of the eastern part of Jeju City has undergone a major transformation between 1914 and 2021. As the old Jeju area where the original city center was located is geographically in contact with the sea, urban sprawl has been made toward Halla Mountain and further to the south of Jeju. Accordingly, the city center has transformed from a monocentric to a polycentric structure. Due to the dynamics of the urban sprawl, the old downtown of Jeju became one of the peripheral neighbourhoods in the Greater Metropolitan of Jeju.

• The Korean Journal of Ecology
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• v.24 no.5
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• pp.281-288
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• 2001

The relationships between the growths of Abies koreana W. and climatic factors were analyzed by the use of tree-ring analysis at the subalpine belt of Mt. Halla National Park. The four cores were extracted from each 21 trees at north-facing slope (1,900m a.s.1.). The site chronology was established on the periods from 1912 to 1999. The growth of A. koreana was very poor, in particular in the years of 1982, 1988 and 1996. Simple correlation was employed to analyze the relationship between the growth of A. koreana and climatic factors. The result of simple correlation indicates that the growth of A. koreana represent positive correlations both with the mean temperatures of April and previous November, and the precipitation of previous December and January. The presence of large number of frost-damaged scars in the individual trees of A. koreana implies that local freezing temperature conditions at Mt. Halla have occurred in 1964, 1965 and 1966. The correlations between the fir chronology SOI(Southern Oscillation Index) of previous January, February and November were significantly positive. The growth ratio of A. koreana demonstrates that this species is sensitive to seasonal variations. As the winter temperature rises, the growth ratio of A. koreana decreases, on the other hand, the increase of autumn temperature accelerates the growth ratio of A. koreana. The growth decline of A. koreana was observed from 51 cores out of the 54 cores, and the overall growth declines have initiated at 1978, 1982 and 1988. Distinct growth decline of A. koreana in the range of 70% is noticed at 34 cores out of the 51 cores. The decline of, A. koreana growth appears to be related to the winter temperature which has increased since mid-1970s.

• Korean Journal of Environment and Ecology
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• v.34 no.5
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• pp.358-371
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• 2020

As climate change is expected to lead to a severe reduction of biodiversity, studies to investigate the reasons for habitat loss, growth decline, and death of Korean fir (Abies koreana Wilson), endangered alpine/subalpine species in Korea, have been conducted for years but found no clear answer yet. This study reviewed previous studies on Korean fir published in the journals in the past 40 years, 1980 through 2020, into 10-year units, examined the study trend by period, region, and subject with a focus on ecological studies, and analyzed the study results. The ecological studies were categorized into evolutionary ecology, physiological ecology, population ecology, and landscape ecology. Based on the results, we suggested the required research fields in the future. We found a total of 73 papers published in the past 40 years and 48 (65.8%) of them published in the past 10 years. In terms of region, Mt. Halla accounted for the most as 41 papers were on it. In terms of ecological subjects, the physiological ecology accounted for the most with 38, and the evolutionary ecology accounted for the least with 10. The review of the study results showed that many studies identified water stress caused by the water resource imbalance due to temperature increase and spring precipitation reduction following climate change as the main reason for the decline and habitat loss of Korean fir. However, recent studies suggested other factors, such as soil environment, disturbing organisms, and climatic events. The cause of the decline and death of the Korean fir not yet being clearly identified is that most of the studies dealt with the basic content, were carried out intermittently, and were concentrated in some regions. Therefore, we need long-term studies with advanced technology in each study subject at a local scale to find the cause of Korean fir decline and present sustainable management and conservation. Moreover, it is necessary to extend our study subjects to ecosystem ecology and systems ecology to integrate the results from various study subjects for a comprehensive understanding of the reason for Korean fir declines. The results of comprehensive studies could provide clearer answers for Korean fir's declines and the alternatives of conservation management and practices.

• Korean Journal of Environment and Ecology
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• v.6 no.2
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• pp.154-161
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• 1993

To investigate the structure and the conservation strategy of Taxus cuspidata forest and at Birobong area in Sobeaksan. 24 plots(400$m^2$) set up with random sampling method. Four groups were classified by cluster analysis. High positive correlations was proved between Quercus mongolica and Symplocos chinensis, Rhododendron schlippenbachii and Pinus densiflora, Taxus cuspidata and Acer pseudo-sieboldianum, Prunus padus and Eunonymus macroptera, Acer mono and Styrax obassia, and high negative correlations was proved between Quercus mongolica and Taxus cuspidata, Prunus padus and Eunonymus macroptera, Rhododendron schlippenbachii and Taxus cuspidata, Acer pseudo-sieboldianum, Prunus padus and Eunonymus macroptera. Species diversity(H') of investigated area was calculated 1.3702-2.9119. To conserve Taxus cuspidata forest at Birobong area in Sobeaksan, research and rescription on the declining of Taxus cuspidata. forest was needed and Quercus mongolica, Styrax obassia, Tripterygium regelii and Weigela subsessilis in the Taxus cuspidata forest should be cleared out.

• Journal of Korea Technology Innovation Society
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• v.16 no.4
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• pp.1134-1162
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• 2013

The purpose of this paper is to provide an innovation strategy for a leading industrial company. We analyze the process of a shift in industrial leadership using the shipbuilding industry as a case study. This paper explains that the three core factors of decline are immobilization, lack of innovation for major products, and organizational inertia. This study presents that the leader of a market is not decided by strong competitiveness, but by quick reaction to major customers' needs, and that out-of-date strategies do not contribute to maintaining leadership. As a result of this study, it shows that the leading Korean industrial companies shall establish a new innovation-oriented and customer-oriented management system that is flexible enough to anticipate and respond to the changes in new competitive environments. These findings contribute to the formulation of new strategies for other manufacturing industries in Korea.

• Korean Journal of Environment and Ecology
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• v.5 no.1
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• pp.25-31
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• 1991

To investigate the structure and the conservation of Abies koreana forest at Banyabong area in Chirisan, 38 plots(100$m^2$) set up with random sampling method. Dead individuals of Abies koreana were 12.81%. were observed mainly upper-layer trees. A few seedlings of Abies koreana were observed. Three groups were classified by cluster analysis. High positive correlations was proved between Abies koreana and Rhododendron mucrolunulatum var. ciliatum, and High negative correlations was proved between Abies koreana and Fraxinus sieboliana, Carpinus cordata, Sasa purpurascens and Cornus controversa. Species diversity(H') of investigated area was calculated 1.9796-2.7509. To conserve Abies koreana forest at Banyabong area in Chirisan. Research and prescription on the declining of Abies koreana was needed and Quercus mongolica, Acer pseudo-sieboldianum, Fraxinus sieboliana, Carpinus cordata, Sasa purpurascens and Cornus controversa in the Abies koreana forest should be cleared out.

• Proceedings of the Korea Air Pollution Research Association Conference
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• 2000.04a
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• pp.297-298
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• 2000

1960년대 후반 이후 대기오염 및 산성비 등 산성강하물에 의한 산림생태계의 쇠퇴 및 피해가 유럽과 북미에서 보고되고 있으며, 최근 중국, 일본 등 동아시아 각국의 급속한 경제발전으로 인하여 산성비의 원인물질인 황산산화물과 질소산화물 배출량의 급속한 증가는 산림생태계의 피해를 가속화 할 것으로 예측되고 있다. 우리 나라의 경우 산성강하물에 의한 대규모의 산림피해는 아직까지 보고되고 있지 않으나, 산성비에 포함된 산성강하물의 토양내로의 부하의 증가는 토양을 산성화시켜 수목의 생육에 악영향을 미칠 가능성이 있다. (중략)

• Ecology and Resilient Infrastructure
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• v.4 no.1
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• pp.71-74
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• 2017

Urbanization is a major driver of global amphibian declines. For the study on the effect of urbanization on amphibians, we compared the growth and the health status of Hyla japonica amphibians collected in the urban areas of Incheon and in the rural area of Gapyeong, Korea. The size and weight of Hyla japonica body in the urban area were smaller than those in the rural area. However, there was no significant difference in their condition factors as a health indicator between the two areas. Our study emphasizes the need for research into the specific mechanism of effects of urbanization on amphibian heath status for the further understanding of the relationship between urbanization and amphibians.

• Journal of the Korean Society of Environmental Restoration Technology
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• v.14 no.2
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• pp.1-10
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• 2011

Six pine trees (Pinus densiflora S. et Z.) at the Euilimji Lake Park in Jecheon were collected to investigate tree ages, growth decline pattern and the years of death. Tree-ring measurement was carried out using the Lintab with a resolution of 0.01mm. Tree age were 80-176 years. Cross-dating between the tree-ring series of each tree and the local chronology from Worak Mountain resulted that four and two trees died in 1998 and 1999, respectively. Three dead trees had only formed earlywood in the outermost tree ring and the others had incomplete latewood. Therefore, it was proven that the former trees died between spring and early summer, whereas the later ones died during late summer and/or autumn. The simultaneous deaths of trees suggest the insect damage and/or drought may be the crucial reason of the death, but frequent reaction woods, which were formed by leaning stem, and scars formed by physical damage may also contribute to the death.

• The Korean Journal of Ecology
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• v.27 no.6 s.122
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• pp.335-345
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• 2004

This study was carried out to on liana dominating at the vicinity of Onsan Industrial Complex declining P. thunbergii foersts. It was surveyed 16 species, 30 species and 50 species at upper, middle and understory, respectively. It was dominant P. thunbergii at upperstory, and P. densiflora, P. thunbergii, Quercus dentata and Q. serrata at middlestory, and Smilax china, Paederia scandens, Symplocos chinensis var. sinuata, Styrax japonica, Lonicera japonica and Q. serrata etc. at understory. It was the highest importance value(13.2) of S. china among all liana, and in order of L. japonica (11.7), P. scandens (11.5) and Cocculus trilobus (7.7). Number of species, Species diversity, Maximum species diversity, Evenness and Dominance of woody plants at upperstory and middlestory by each survey site were higher in forest areas than industrial complex, but those of understory highly showed at industrial complex, and ratio of liana at understory was high. It showed total 50 species at herbaceous plants, and was high I.V. of Pteridium aquilinum var. latiusculum, Spodiopogon cotulifer, Commerelina commuris, Phytolacca americana, Rubus parvifolius, Miscanthussinensis var. purpurascens and Calamagrostis arundinacea, etc.