• Mycobiology
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• 제49권5호
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• pp.476-490
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• 2021

Global temperatures are steadily increasing, leading to significant changes in microbial diversity and ecology. In the present study, we isolated high-temperature-growing fungi and fungi-like group (Oomycota) strains from freshwater environments of Korea and identified them based on cultural, morphological, and multilocus phylogenetic analyses. As a result, we introduce Saksenaea (Fungi) isolates as a new species, Saksenaea longicolla sp. nov. and record Phytophthora chlamydospora and P. lagoariana (Oomycota) new to Korea. In the growth experiments, they exhibited high-temperature tolerance, which can grow at 35-40 ℃ but become inactive at 4 ℃ and below. This study confirms the presence of high-temperature-tolerant fungi and oomycetes in Korea and suggests that the Korean climate conditions are changing in favor of these species. This indicates that climate warming is altering microbial distributions in freshwater environments.

• 한국지역지리학회지
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• 제14권3호
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• pp.189-198
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• 2008

본 연구의 목적은 2011년 세계육상선수권대회 개최지로 선정된 대구시의 도시 이미지 제고에 필요한 대구의 문화생태환경 복원과 활용을 위한 기초자료를 제공하는 데 있다. 본 연구를 통해 얻은 주된 결과는 다음과 같다. 첫째, 잘못 알려져 있는 대표적인 자연경관은 신천과 입암으로 이에 대한 수정이 시급히 요구되며, 이 외에도 지명의 오기에 대한 수정이 필요하다. 둘째, 고문헌에 전해지는 대구의 두 바위 중 하나인 입암은 이미 사라진 상태이지만, 화암은 최근에 그것의 실체가 밝혀진 만큼 이에 대한 충분한 보존방안이 마련되어야 할 것이다. 셋째, 사라질 위기에 처한 주요 자연경관의 보존을 위해 이들을 대구 문화생태관광 자원으로 활용하는 방안을 제시한다. 넷째, 연구자는 본 연구에서 중요하게 다루고 있는 지형경관 중에서도 문화 또는 역사와 관련된 지형경관을 특별히 '문화지형(Cultural landform)'으로 부를 것을 제안한다.

• 한국지역지리학회지
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• 제7권3호
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• pp.14-28
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• 2001

본 연구는 경상북도 울릉도 자연환경자원보호구역에서의 난개발의 문제점과 개선방안을 제시하는 것이다. 울릉도 자연환경자원 보전구역에서 발생되는 난개발 형태는 국토이용변경, 일주도로의 개설, 항만건설에 따른 석산개발, 관광지 지정조성 및 군사시설 설치 등이다. 문제점으로는 첫째, 국토이용변경으로 인한 동식물의 서식영역 감소와 식수원 오염이다. 둘째, 일주도로개설로 인한 자연생태계파괴이다. 셋째, 항만건설과 석산개발로 인한 자연경관 훼손 및 해양생태계 변화이다. 넷째, 관광지 지정조성과 군대시설 설치에 따른 회귀한 식물의 훼손과 식수원 오염이다. 개선되어야 할 점으로는 첫째, 국토이용변경으로 인하여 회귀한 식물이 훼손되지 않도록 친환경적으로 개발한다. 둘째, 도로 시설, 항만을 설치할 때는 환경영향평가를 실시하여 자연경관 및 환경자원의 훼손을 최소화하도록 한다. 셋째, 도서지역 개발에 소요되는 석재 등은 전부 육지에서 반입하도록 하고 도서지역의 열악한 재정을 감안하여 그 소요예산은 전적으로 국가에서 부담하여야 한다. 넷째, 관광지 지정조성에 대해서는 이미 조성된 지역은 계획적으로 관리하며, 미 조성된 지역은 자연환경보전지역으로 재조정하도록 한다. 다섯째, 군대시설을 설치할 경우, 당해 자치단체와 반드시 협의하여 설치하도록 한다. 다섯째, 공무원 및 해당 주민들의 자연환경자원보전 및 보호하고자하는 의식이 필요하다 마지막으로 지역주민들에 대한 재정적인 지원이다.

• The Korean Journal of Ecology
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• 제23권2호
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• pp.135-140
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• 2000

The Government of Mongolia approved establishment of the Mongolian LTER network in December 1997. In June 1998, a seminar was organized by the Mongolian Academy of Sciences to initiate the program. Dr. James Gosz of the US LTER program keynoted the seminar. A Mongolian LTER Steering Committee was established to organize the network and to develop guidelines for its management. This Committee designated Hovsgol National Park in northern Mongolia as the first Mongolian LTER network site. Other potential sites are presently being considered. including study sites in steppe grassland and desert locations. The primary goals of the Mongolian LTER Network are to study human impacts on Mongolia's environment; with a focus on short-term impacts of nomadic grazing on terrestrial and aquatic ecosystems and long-term climate change impacts on more pristine environments in the protected areas. There are at least two additional goals: to provide information and advice on how best to protect Mongolia's pristine environments, and to train Mongolian students to work on environmental problems to encourage the growth of expertise for making sound environmental decisions.

• Computers and Concrete
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• 제19권5호
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• pp.443-449
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• 2017

Taking high geothermal tunnels as background, the deformation of concrete for shotcrete use was studied by simulating hot-humid and hot-dry environments in a laboratory. The research is made up by two parts, one is the influence of two kinds of high geothermal environments on the deformation of shotcrete, and the other is the shrinkage inhibited effect of fiber materials (steel fibers, polypropylene fibers, and the mixture of both) on the concrete in hot-dry environments. The research results show that: (1) in hot and humid environments, wet expansion and thermal expansion happened on concrete, but the deformation is smooth throughout the whole curing age. (2) In hot and dry environments, the concrete suffers from shrinkage. The deformation obeys linear relationship with the natural logarithm of curing age in the first 28 days, and it becomes stable after the $28^{th}$ day. (3) The shrinkage of concrete in a hot and dry environment can be inhibited by adding fiber materials especially steel fibers, and it also obeys linear relationship with the natural logarithm of curing age before it becomes stable. However, compared with no-fiber condition, it takes 14 days, half of 28 days, to make the shrinkage become stable, and the shrinkage ratio of concrete at 180-day age decreases by 63.2% as well. (4) According to submicroscopic and microscopic analysis, there is great bond strength at the interface between steel fiber and concrete. The fiber meshes are formed in concrete by disorderly distributed fibers, which not only can effectively restrain the shrinkage, but also prevent the micro and macro cracks from extending.

• Asian-Australasian Journal of Animal Sciences
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• 제8권3호
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• pp.241-247
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• 1995

The aim of the present study was to investigate the effect of internal parasites on growth rates of Thai Native (TN) and crossbred (75% TN $\times$ 25% Anglo-Nubian, AN and 50% TN $\times$ 50% AN) goats (undrenched, drenched every 3 weeks or at 9 weeks) in village environments in southern Thailand in a humid tropical climate. There was no significant (p > 0.05) difference in growth rate ($g/kg^{0.75}/d$) between the genotypes during unsupplemented grazing (0-64 days of the experimental period). However, during supplementary feeding (64-127 days) and throughout the period (0-127 days) TN goats had significantly (p < 0.01) lower growth rates compared with 75% TN $\times$ 25% AN and 50% TN $\times$ 50% AN goats. There was no (p > 0.05) significant difference in growth rates between 75% TN $\times$ 25% AN and 50% TN $\times$ 50 % AN goats. The growth rates of goats drenched every 3 weeks were significantly (p < 0.01) higher than those undrenched or drenched at 9 weeks. The results of this study also indicate that drenching alone did not result in increased weight gain except when the nutritional status was also improved. Parasitic infection affected some blood constituents, such as pack cell volume, haemoglobin, total protein and albumin. This resulted in lower growth rates for control groups and goats drenched at 9 weeks compared to those of goats drenched every 3 weeks.

• International Journal of Computer Science & Network Security
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• 제21권6호
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• pp.47-53
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• 2021

The article deals with the problems of application of microwave methods in systems of geoecological monitoring of natural environments and resources of the agro-industrial complex. It is noted that the methods of microwave radiometry make it possible, by the power of the measured intrinsic radio-thermal radiation of the atmosphere, when solving inverse problems using empirical and semi-empirical models, to determine such parameters of the atmosphere as thermodynamic temperature, humidity, water content, moisture content, precipitation intensity, and the presence of different fractions of clouds.In addition to assessing the meteorological parameters of the atmosphere and the geophysical parameters of the underlying surface based on the data of microwave radiometric measurements, it is possible to promptly detect and study pollution of both the atmosphere and the earth's surface. A technique has been developed for the analysis of sources of measurement error and their numerical evaluation, because they have a significant effect on the accuracy of solving inverse problems of reconstructing the values of the physical parameters of the probed media.To analyze the degree of influence of the limited spatial selectivity of the antenna of the microwave radiometric system on the measurement error, we calculated the relative measurement error of the ratio of radio brightness contrasts in two angular directions. It has been determined that in the system of geoecological monitoring of natural environments, the effect of background noise is maximal with small changes in the radiobrightness temperature during angular scanning and high sensitivity of the receiving equipment.

• 한국경제지리학회지
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• 제13권2호
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• pp.270-295
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• 2010

본 연구는 성주와 고령에 위치한 두 동족마을의 자연 환경과 사회 경제 변화를 분석하였다. 연구 결과는 네 가지로 요약될 수 있다. 첫째, 동족마을의 위치와 자연환경은 마을 내 외부와의 관계, 자연 재해, 생산 활동, 주민의 의식 등에 많은 영향을 주었다. 둘째, 1970년대 이후 인구의 감소는 상곡과 수촌의 두 동족마을에서 나타나고 있다. 이러한 현상은 두 마을의 자녀 출생과 주민의 도시이주를 통해서 잘 알 수 있다. 셋째, 1970년대 이후 산업화와 도시화는 동족마을에 큰 영향을 끼쳤다. 낙동강을 사이에 두고 대구광역시와 맞닿아 있는 상곡마을은 1990년대 이후 대구광역시의 외연적 팽창에 의해 큰 영향을 받았다. 이에 반해 가야산계에 가까이 위치한 수촌마을은 참외를 상업적 작물로 재배하게 됨에 따라 전통적 동족마을의 모습이 변하게 되었다. 넷째, 마을의 농업상태에 대해 상곡과 수촌마을 주민의 인식에는 어느 정도 차이가 있다. 두 마을의 주민은 농촌이 직면하고 있는 여러 가지 문제들을 자신들이 살고 있는 마을의 사회 경제 상황에 따라 다르게 인식하였다.

• 로봇학회논문지
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• 제3권4호
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• pp.278-286
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• 2008

Reliable functionalities for autonomous navigation and object recognition/handling are key technologies to service robots for executing useful services in human environments. A considerable amount of research has been conducted to make the service robot perform these operations with its own sensors, actuators and a knowledge database. With all heavy sensors, actuators and a database, the robot could have performed the given tasks in a limited environment or showed the limited capabilities in a natural environment. With the new paradigms on robot technologies, we attempted to apply smart environments technologies-such as RFID, sensor network and wireless network- to robot functionalities for executing reliable services. In this paper, we introduce concepts of proposed smart environments based robot navigation and object recognition/handling method and present results on robot services. Even though our methods are different from existing robot technologies, successful implementation result on real applications shows the effectiveness of our approaches.

• 한국기술사회:학술대회논문집
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• 한국기술사회 1983년도 한일기술사 합동 심포지움
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• pp.74-77
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• 1983

To attain the rich and comfortable human living, much development and economic growth are needed. But the radical development destroys natural environments or resources, and also the life environments are destroyed. How to maintain the balance between development and environments forms an important problem. Since 1955, a great deal of damage has been done to human being by the pollution of air, water or noise in Japan, for example, Minamata-byo (1956), arsenical poisoning by mkil (1955), Cd-I taiitai-byo (1955), asthma by air pollution, etc. Now, there are over 100,000 sick persons suffering from pollution in Japan. To prevent the pollution, the first act was made 1967, the kind of which were defined as follow:air, water, soil, noise, vibration ground subsidence, and bad smell. Laws on these were established 1970∼1981, and the environments here ave gradually being improved. The mentioned above gituation necsesitates the measuring or chemical analysis of pollution data, but the many cost is necessary to obtain such data. The special environment measuring certifier was needed and the Measurement Law was amended 1974. Some comment will be given of the present condition of environmental measuring certifier.