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손승훈,조아람,김동언 한국생태학회 2021 Journal of Ecology and Environment Vol.45 No.4
Background: Some of the introduced alien species introduced settle, multiply, and spread to become invasive alien species (IAS) that threaten biodiversity. To prevent this, Korea and other countries legally designate and manage alien species that pose a risk to the environment. Moreover, 2160 alien species have been introduced in South Korea, of which 1826 animals and 334 plants are designated. The inflow of IAS can have negative effects such as ecosystem disturbance, habitat destruction, economic damage, and health damage to humans. To prevent damage caused by the inflow of IAS in advance, species that could potentially pose a risk to the environment if introduced in South Korea were designated as alert alien species (AAS). Results: The designation criteria were in accordance with the “Act on the Conservation and Use of Biological Diversity” and the “Regulations on the Ecological Risk Assessment of AAS and IAS” by the National Institute of Ecology. The analysis result of risk and damage cases indicated that mammals affect predation, competition, human economic activity, virus infection, and parasite infection. Birds have been demonstrated to affect predation, competition, human economic activity, and health. It was indicated that plants intrude on the ecosystem by competing with native species with their high-population density and capacity to multiply and cause allergic inducement. Interestingly, 300 species, including 25 mammals, 7 birds, 84 fishes, 28 amphibians, 22 reptiles, 1 insect, 32 spiders, 1 mollusk, 1 arthropod, and 99 plants, are included in the list of AAS. Conclusions: AAS designation plays a role in preventing the reduction of biodiversity by IAS in South Korea and preserving native species. Moreover, it is determined to provide considerable economic benefits by preventing socio-economic losses and ecological damage. Background: Some of the introduced alien species introduced settle, multiply, and spread to become invasive alien species (IAS) that threaten biodiversity. To prevent this, Korea and other countries legally designate and manage alien species that pose a risk to the environment. Moreover, 2160 alien species have been introduced in South Korea, of which 1826 animals and 334 plants are designated. The inflow of IAS can have negative effects such as ecosystem disturbance, habitat destruction, economic damage, and health damage to humans. To prevent damage caused by the inflow of IAS in advance, species that could potentially pose a risk to the environment if introduced in South Korea were designated as alert alien species (AAS). Results: The designation criteria were in accordance with the “Act on the Conservation and Use of Biological Diversity” and the “Regulations on the Ecological Risk Assessment of AAS and IAS” by the National Institute of Ecology. The analysis result of risk and damage cases indicated that mammals affect predation, competition, human economic activity, virus infection, and parasite infection. Birds have been demonstrated to affect predation, competition, human economic activity, and health. It was indicated that plants intrude on the ecosystem by competing with native species with their high-population density and capacity to multiply and cause allergic inducement. Interestingly, 300 species, including 25 mammals, 7 birds, 84 fishes, 28 amphibians, 22 reptiles, 1 insect, 32 spiders, 1 mollusk, 1 arthropod, and 99 plants, are included in the list of AAS. Conclusions: AAS designation plays a role in preventing the reduction of biodiversity by IAS in South Korea and preserving native species. Moreover, it is determined to provide considerable economic benefits by preventing socio-economic losses and ecological damage.
손승훈,이재강,황현수,엄태경,임신재 한국산림과학회 2021 Forest Science And Technology Vol.17 No.1
We examined the short-term effects of tree thinning on microhabitat factors and the abundances of striped field mice Apodemus agrarius, Korean field mice Apodemus peninsulae, and Korean red-backed voles Myodes regulus within a Japanese larch Larix kaempferi forest in South Korea. Three different stands were thinned to 0%, 25%, or 50%. Ground vegetation was higher in the second year of tree thinning than in the first year. In the first year of thinning, ground vegetation was significantly higher in the control than in the 50% thinned stand, whereas the opposite trend was observed in the second year. Mid-story vegetation was higher in the control than in the 50% thinned stand. In the first year of thinning, the sub-overstory vegetation was higher in the control than in the 50% thinned stand. Basal area was the highest in the control stand. Abundances of the three rodent species were higher in the second year of tree thinning than in the first year. The abundance of A. peninsulae was higher in the control than in the 50% thinned stand. Overall, the three rodent species preferred microhabitats with dense ground vegetation. Our results showed that the short-term effects of tree thinning altered microhabitat factors and disturbed microhabitat conditions in the first year; furthermore, the 50% thinned stand did not provide suitable habitats for A. peninsulae. In this study, moderate (25%) tree thinning resulted in a convenient balance between biodiversity conservation and human demands for forest wood.
Single-Electron Transport in GaAs/AlGaAs Nano-In-Plane-Gate Transistors
손승훈,Y. S. Choi,K. H. Cho,황성우,J. I. Lee,Y. J. Park,유윤섭,D. Ahn 한국물리학회 2005 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.47 No.3
We report the fabrication and haracterization of two different in-plane-gate transistors made from a GaAs/AlGaAs two-dimensional electron system. The first transistor is depletion mode and the second one is enhancement mode. These two modes are distinguished by the fabricated channel width. Transport measurements at room temperature (T) of these devices show the depletionmode and enhancement-mode-field-effect-transistor characteristics, respectively. The drain currentgate bias (IDS-VCG1) measurements of both transistors at a low temperature (T = 4.2 K) exhibit Coulomb oscillations. Moreover, IDS-VCG1 characteristics of the enhancement mode device can be reproduced by a double dot in series model.
Seung-Hun Son(손승훈),Kyu-Jung Kim(김규중),Hyun-Su Hwang(황현수),Shin-Jae Rhim(임신재) 한국조류학회II 2012 한국조류학회지 Vol.19 No.1
This study was conducted to clarify the influences of temperature and humidity on breeding ecology of tits Parus spp. used artificial nest boxes in a coniferous forest from March through July, 2009 and 2010. There were differences in the mean temperatures in March, April, and July between 2009 and 2010. Temperature of early breeding season was higher in 2009 than in 2010. Relative humidity was not significantly different between 2009 and 2010. In our study, varied tit Parus varius, marsh tit P. palustris, coal tit P. ater, and great tit P. major bred in the artificial nest boxes at the study area. The number of used artificial nest boxes, rate of used artificial nest boxes, number of total bred pairs, and rate of breeding success of Parus spp. were higher in 2009 than in 2010. The incubation period and fledging period of P. palustris and P. ater were longer in 2010 than in 2009. The increase of chicks' body weight and tarsus were different between 2009 and 2010. Our results suggest that change in temperature can disrupt breeding phenology of P. palustris and P. ater. Long-term studies provide a unique opportunity to observe how changes of the physical environment (including climate change) affect the biology and ecology of birds at both individual and population levels on long-time scales. 본 연구는 침엽수림에 설치한 인공새집에서 번식을 실시한 박새류의 번식에 기온과 습도가 미치는 영향을 파악하기 위해 2009년과 2010년의 3월부터 7월까지의 기간 동안 실시되었다. 번식기 동안 매달 평균기온은 2009년이 2010년에 비해서 높은 것으로 나타났으며, 습도는 차이가 없었다. 설치한 인공새집에서는 곤줄박이, 쇠박새, 진박새, 박새가 번식을 하였으며, 2009년의 이용된 인공 새집의 수, 인공새집 이용률, 번식쌍수, 번식성공률이 2010년에 비해서 높은 것으로 나타났다. 쇠박새와 진박새의 경우, 포란 기간과 육추 기간이 2009년에 비해 2010년이 길었으며, 새끼와 부척의 성장 역시 다른 것으로 나타났다. 이러한 결과로 보아 번식기 동안의 기온이 박새류의 번식에 영향을 주는 것으로 판단되며, 기후변화를 포함해 환경의 변화가 조류의 번식에 미치는 영향에 대한 장기적인 생태 연구가 수행되어야 할 것이다.