• Korean Journal of Ichthyology
• /
• v.31 no.1
• /
• pp.16-22
• /
• 2019

Investigations on the study of the distribution aspects and extinction threat evaluation of the Korean endemic species, Iksookimia pacifica were done from 2017 to 2018 in Korea. During the study period, the samples of I. pacifica were collected in 17 streams, 46 sites (from Baebongcheon Stream of Goseong-gun to Gunsuncheon Stream of Gangneung-si) among the noted 33 streams and 104 sampling sites investigated. The population size of I. pacifica was relatively large in streams such as Bukcheon, Baebongcheon, Hwasangcheon, Cheonjincheon, Ohhocheon Stream etc., but the population size was small in streams such as Sacheoncheon, Namcheon, Gangneung Namdaecheon Stream etc. The main habitat of I. pacifica was the downstream pool of clean water with slow velocity and sand bottoms, and their sensibility was estimated to be due to river work and water pollution. Comparing the previous records of the appearance of I. pacifica, they were first seen in Sampocheon Stream, but they did not appear in Jusucheon, Jeoncheon, Samcheok Osipcheon Stream. Given this evidence as noted for the 19.5% reduction in occupancy within 3 generations, in small appearance range ($1,343km^2$) and small occupancy area ($184km^2$), the number of locations were many (18) and the population was relatively large within the range of habitat. Therefore, I. pacifica is now considered a Near Threatened (NT) based on the IUCN Red List categories and criteria.

• Journal of the Korean Society for Marine Environment & Energy
• /
• v.14 no.4
• /
• pp.293-300
• /
• 2011

Many countries of the world, including IMO, has noticed that foreign marine hazardous organisms, which were introduced by ballast water, have disturbed the marine ecosystem of its own nation, and posed a serious threat to human health and the value of environment and economy. Therefore, IMO has tried to manage the introduced species by assessing the risk of ballast water, and suggested three risk assessment methods, such as environmental matching risk assessment, speciesbiogeographical risk assessment, and species-specific risk assessment. In this thesis, species-specific risk assessment method was considered, and a risk assessment program established by applying it was described.

• Journal of the Korean Society for Marine Environment & Energy
• /
• v.13 no.4
• /
• pp.335-340
• /
• 2010

The paper describes the objectives of Yellow Sea Large Marine Ecosystem (YSLME) project, focusing on procedural and practical aspects. YSLME is a highly productive sea yet possibly one of the most impacted large marine ecosystems, in terms of anthropogenic stressors, due the enormous coastal population. The aim of the YSLME project is the reduction of ecosystem stress through identification of the environmental problems in the Transboundary Diagnostic Analysis (TDA) that are then addressed in the Strategic Action Programme (SAP). One of the major problems found to be affecting biological diversity is habitat modification through wetland reclamation, conversion and degradation. Since the early 1900's more than 40% of intertidal wetlands have been reclaimed in Korea, and 60% of Chinese coastal wetlands have been converted or reclaimed. Damaging fishing practices, pollution and coastal eutrophication have further degraded the coastal environment reducing the biological diversity. To combat this loss, the YSLME project has mounted a public awareness campaign to raise environmental consciousness targeted at all different levels of society, from politicians at parliamentary workshops, local government officer training events, scientific conferences and involvement of scientists in the project research and reporting, to university and high school students in our visiting internship programmes and environmental camps. We have also built networks through the Yellow Sea Partnership and by liaising and working with other environmental organizations and NGOs. NGO's are recognised as important partners in the environmental conservation as they already have extensive local networks that can be lacking in international organisations. Effective links have been built with many of these NGOs through the small grants programme. Working with WWF's YSESP project and other academic and research institutions we have conducted our own biodiversity assessments that have contributed to the science-based development of the SAP for the YSLME. Our regional targets for biodiversity outlined in the SAP include: Improvements in the densities, distributions and genetic diversity of current populations of all living organisms including endangered and endemic species; Maintenance of habitats according to standards and regulations of 2007; and a reduction in the risk of introduced species. Endorsement of the SAP and its successful implementation, during the proposed second phase of the YSLEM project, will ensure that biological diversity is here to benefit future generations.

• Journal of the Korean Institute of Landscape Architecture
• /
• v.52 no.2
• /
• pp.110-126
• /
• 2024

This study conducted a classification of small-scale biological habitats created in Seoul to analyze and synthesize location characteristics, habitat structure, biological habitat functions, and threat factors of representative sites, as well as derive creation and management problems according to the ecological characteristics. The aim was to suggest improvement measures and management items. Data collected through a field survey was used to categorize 39 locations, and 8 representative sites were selected by dividing them into location, water system, and size as classification criteria for typification. Due to the characteristics of each type, the site was created in an area where amphibian movement was disadvantageous due to low or disconnected connectivity with the hinterland forest, and the water supply was unstable in securing a constant flow and maintaining a constant water depth. The habitat structure has a small area, an artificial habitat structure that is unfavorable for amphibians, having the possibility of sediment inflow, and damage to the revetment area. The biological habitat function is a lack of wetland plants and the distribution of naturalized grasses, and threats include the establishment of hiking trails and decks in the surrounding area. Artificial disturbances occur adjacent to facilities. When creating habitats according to the characteristics of each type, it was necessary to review the possibility of an artificial water supply and introduce a water system with a continuous flow in order to connect the hinterland forest for amphibian movement and locate it in a place where water supply is possible. The habitat structure should be as large as possible, or several small-scale habitats should be connected to create a natural waterfront structure. In addition, additional wetland plants should be introduced to provide shelter for amphibians, and facilities such as walking paths should be installed in areas other than migration routes to prevent artificial disturbances. After construction, the management plan is to maintain various water depths for amphibians to inhabit and spawn, stabilize slopes due to sediment inflow, repair damage to revetments, and remove organic matter deposits to secure natural grasses and open water. Artificial management should be minimized. This study proposed improvement measures to improve the function of biological habitats through the analysis of problems with previously applied techniques, and based on this, in the future, small-scale biological habitat spaces suitable for the urban environment can be created for local governments that want to create small-scale biological habitat spaces, including Seoul City. It is significant in that it can provide management plans.

• Journal of Wetlands Research
• /
• v.20 no.2
• /
• pp.181-189
• /
• 2018

This study was performed to analyze the dynamics and distributional condition of biological community and to support the basic information about the estuarine ecosystem management by using the intensively surveyed results by each taxon experts around Tamjin river. We analyzed the biological diversity, abundance, correlation among species, and ecological characteristics about 11 taxa groups including vegetation, fish, birds, mammals, etc. in the Tamjin river estuarine ecosystem. We classified vegetation types into 7 physiognomic types and 18 communities according to habitat conditions with the physical environments and salinity. In total, 1125 species including 9 species of endangered species were identified in research area. The species composition and distributional characteristics of each taxon were corresponded to the environmental characteristics of the estuarine ecosystem. Especially, the species diversity and distribution were clearly distinguished in the river according to the difference of the environmental factors such as flow rate, salinity, and soil. Despite the disturbance factors such as barrage and levees, the biodiversity and its distribution were evaluated to be high level under the current environmental conditions. However, loss or reduction of wildlife habitat due to reclamation, embankment, barrage installation and expansion of farmland has been identified as a major threat to the diversity and health of the local ecosystem. The results of this study can be used as a basic data to cope with various development pressure and damage crisis of the whole estuaries including Tamjin river.

• Journal of Bio-Environment Control
• /
• v.10 no.3
• /
• pp.197-206
• /
• 2001

The depletion of stratospheric ozone is regarded as a major environmental threat to plant growth and ecosystem. The ozone depletion has caused plants to be exposed to an increased penetration of solar ultraviolet-B (UV-B) radiation in the 280-320 nm wavelength range. Enhanced UV-B radiation may have influence on plants biological functions in many aspects including inhibition of photosynthesis, DNA damage, lipid peroxidation, changes in morphology, phenology, and biomass accumulation. To cope with the damage by UV radiation, plants have evolved to have protective mechanisms, such as photorepair, accumulation of UV-absorbing compounds, leaf thickening and activation of antioxidative enzymes. The objective of this review is to address the effects of enhanced UV-B on plant growth, UV-B action mechanisms and protection and protection mechanisms in plants.

• Proceedings of the Korea Water Resources Association Conference
• /
• 2022.05a
• /
• pp.489-489
• /
• 2022

도시의 가로수들이 열악한 부지 조건과 적절하지 않은 가로수 관리로 인해 죽는 현상이 몇몇 도시에서 발생하고 있다. 열악한 부지 조건과 적절하지 않은 가로수 관리에는 생물학적·기상학적으로 많은 요소들이 있고, 그 밖에 도시 설계로 인한 요인들로 다양하다. 그중 연구지역인 춘천시에서는 가로수가 죽는 원인 중 토양수분이 가장 큰 원인일 것이라고 판단하였다. 토양수분 분포의 시간적 공간적 특성들은 증발, 침투, 지하수 함량, 토양 침식, 식생 분포 등을 지배하는 중요한 요소이며, 토양수분 연구는 물순환과정의 특성을 이해하는데 있어서 필수적인 과정이다. 하지만 토양수분 분석은 중요성에 비해 활발한 연구가 이루어지지 않고 있으며, 특히 가로수 토양수분에 대해서는 연구가 없는 실정이다. 따라서 가로수 토양수분 모니터링을 실시하였고, 장기적인 가로수 관리를 위해 모델링을 하였다. 모델링 기초자료 확보를 위한 토양수분 모니터링은 춘천시의 가로수 중 세 군데를 선정해 각각 10, 20, 30 cm에 센서를 설치하였다. 이를 통해 약 1년간의 토양수분 함량 데이터를 수집하였고, 모니터링 지점의 토양을 샘플링 후 분석하여 물리, 화학, 생물성 데이터를 수집하였다. 모델링은 RZWQM(Root Zone Water Quality Model)을 이용하여 시나리오를 구성하였다. 모델링 결과를 활용해 가로수 및 도시 표토 기능을 위협하는 요인을 분석하였다.

• Ecology and Resilient Infrastructure
• /
• v.10 no.1
• /
• pp.11-19
• /
• 2023

Alien species are known to threaten regional biodiversity globally, which has increased global interest regarding introduction of alien species. The Ministry of Environment of Korea designated species that have not yet been introduced into the country with potential threat as alert alien species to prevent damage to the ecosystem. In this study, potential habitats of Esox lucius and Maccullochella peelii, which are predatory and designated as alert alien fish, were predicted on a national basis. Habitat suitability was evaluated using EHSM (Ecological Habitat Suitability Model), and water temperature data were input to calculate Physiological Habitat Suitability (PHS). The prediction results have shown that PHS of the two fishes were mainly controlled by heat or cold stress, which resulted in biased habitat distribution. E. lucius was predicted to prefer the basins at high latitudes (Han and Geum River), while M. peelii preferred metropolitan areas. Through these differences, it was expected that the invasion pattern of each alien fish can be different due to thermal preference. Further studies are required to enhance the model's predictive power, and future predictions under climate change scenarios are required to aid establishing sustainable management plans.

• Journal of the Korean housing association
• /
• v.8 no.1
• /
• pp.57-75
• /
• 1997

사람들은 대부분의 시간을 집이나 직장에서 보내게 된다. 그러므로 집과 사무실은 삶에 있어서 가장 중요한 두 개의 공간인 것이다. 인간공학적으로 디자인된 사무실은 그곳에서 일하는 사람들의 신체적, 사회적 요구에 부합하게되어 작업능률과 만족감을 향상시키며, 스트레스를 조절하고, 건강과 안전을 위협하는 요소를 최소화한다. 특히 많은 책임과 권한을 가진 사장들에게 있어서 인간공학적으로 디자인된 환경은 필수적인 요건이 될 것이다. 본 연구는 사례조사법을 이용하여 미국 Lowa주 주도인 Des Moines에 사무실을 갖고있는 10개 보험회사 사장들을 대상으로 설문지와 관찰조사 및 실내공간 스케치를 이용하였다. 대부분의 사무실은 직접적으로 일과 관련된 디자인 부분만 강조되어 있었으며 그들의 많은 시간이 읽기와 쓰기등 시각적인 일에 쓰여지고 있음에도 불구하고 조명, 특히 국부조명은 거의 고려되어 있지 않았다. 상담이나 접견과 같은 활동을 위한 가구의 선택이나 실내공간계획이 제대로 되어 있지 않았다. 사용후 평가를 실시한 결과 대부분의 대상자들은 심리적, 생물학적 요구사항들에 대해 긍정적인 평가를 하였다. 디자이너는 좀더 사용자 위주의 공간계획을 해 나가야 할 것이며 각각 다른 사무실특성, 기능, 인간관계. 특히 종업원과의 관계, 사업종류 등을 명확히 이해해야 할 것이다.

• Food Industry And Nutrition
• /
• v.4 no.3
• /
• pp.34-41
• /
• 1999

최근 여러 가지 식품유래 병원균(food-borne pathogen)에 의한 발병(outbreaks)은 식품과학자들을 포함한 학계, 식품산업계, 정부기관, 그리고 소비자들 모두에게 식품 안전성에 대한 새로운 관심을 유발시키고 있다. 식품 안전성에 결여에 따른 식품 유래 병원균에 의한 발병은 국민 건강을 위협하여 직접적으로 보건 의료 분야에 많은 경비부담을 유발시킬 뿐 아니라, 식품의 생산 공급체계에도 부정적인 영향을 끼침으로써 국가 경제 전체에 손실을 가져오기도 한다 ( 1, 8, 35). 따라서 생산자와 소비자가 함께 신뢰 할 수 있는 분석방법을 통해 각개 식품의 안전성에 대한 품질보증(quality assurance)은 소비자뿐만 아니라 식품 산업계 자체로부터도 요구되고 있다. 이러한 시점에서 식품에 존재하는 병원성 균을 신속하게 검색하고 , 정량하고 또 그들의 특성을 분류 할 수 있는 방법을 고찰하는 것은 매우 의미 있는 작업이라 할 수 있겠다.