• Bulletin of the Korean Space Science Society
• /
• 2003.10a
• /
• pp.84-84
• /
• 2003

태양의 극자외선관측은 오존층에서 흡수되어 지상에서는 불가능하다. 그럼에도 불구하고, 우주발사체나 로켓을 이용하여 계속적인 관측이 행하여지는 이유는 지구에 영향을 미치는 태양의 활동을 알아내는데 중요한 영역이기 때문이다. 이러한 관측이 그동안 어떻게 진행되어져 왔으며, 어느 정도의 데이터를 확보하고 있는지에 대해서 정리해 보았다. 국내에서도 극자외선 영역의 관측이 가능한 기기를 만들어 자체적인 우주환경 예보 시스템을 구축할 수 있어야 할 것이다. 본 연구진은 극자외선 태양망원경 EM 개발을 통하여 해외의 기술을 조사하고, 본 개발에 도입하여 국내에서의 제작이 가능한지에 대해 알아보았다 개발에 이용된 자료들과 개발 결과에 대해서 논의하겠다.

• Journal of Korean Society of Forest Science
• /
• v.86 no.1
• /
• pp.80-86
• /
• 1997

The objective of this study was to investigate how resistant poplar hybrid makes compensation to ozone stress. Growth, net assimilation rate and initial Rubisco activity were investigated. This study elucidates the physiological mechanisms associated with ozone sensitivity and resistance in 3 selected $F_2$ hybrids, a family originating from a cross between Populus trichocarpa${\times}$P. deltoides. Open-top chambers were used. Ozone concentrations varied from 90 to 115 ppb for 126 days, 6 to 9 hours in a day. This study tested the hypothesis that resistant poplar hybrid maintains the biomass production to ozone exposure via increased net assimilation rate and Rubisco activity. Growth, biomass, net assimilation rate and initial Rubisco activity were generally reduced by ozone treatment. In the tree parts, root under ozone stress was the most sensitive part. Reduced allocation of photosynthates to root growth might be due to increased respiratory demands for maintenance and repair of aboveground tissue damaged by ozone stress. Maintenance or increases remaining leaves in photosynthetic rates and Rubisco activity in resistant clone in response to ozone treatment were the results of biological compensation to ozone stress.

• Korean Journal of Environmental Agriculture
• /
• v.17 no.4
• /
• pp.352-357
• /
• 1998

This experiment was conducted to find out the effects of major nutrient levels(N, P, K) on ozone susceptibility of tomato plants(Lycopersicon esculentum Mill, cv. Pink Glory). Plants were grown in water culture system. A half-strength of Hoagland's nutrient solution was considered as a standard formulation($N_{100}$ $P_{100}$ $K_{100}$). The levels of major nutrients were adjusted through addition or removal of several fertilizer salts from the standard solution. Top growth was significantly decreased at the low nitrogen level or phosphorus removal condition. P- and K-contents of leaves were greatly decreased by removal of salts containing P and K from the nutrient solution. The rate of ozone injury was significantly increased when potassium was removed. However, the influence of nitrogen and phosphorus levels or high potassium level on injury occurrence did not show statistical significance compared to the standard solution. Ozone exposure resulted in reduction of chlorophyll, and increase of ethylene production, electrolyte leakage and malondialdehyde(MDA) contents. These changes were much more enhanced in plants grown at the potassium removal solution. Whereas the activity of superoxide dismutase(SOD) was low at the potassium removal treatment and this tendency remained after ozone exposure. These results indicated that potassium nutrient level in tomato plants is closely associated with the susceptibility to ozone injury.

• Journal of the Korean earth science society
• /
• v.24 no.3
• /
• pp.216-233
• /
• 2003

This study delineates the phenomena related with global environmental changes such as global warming, ozone depletion, and El Ni${\tilde{n}}$o/Southern Oscillation (ENSO) noted in the Antarctic. Retreat of ice cliffs, glaciers, and calving of ice shelves indicate the effects of recently aggravated global warming. The ice cliff located at Marian Cove, King George Island, South Shetland Islands off the Antarctic Peninsula has been observed to be retreating faster in the last 7 years than in the previous 38 years since 1956. There are some indications of temperature and precipitation changes associated with ENSO around King Sejong Station. The regression analyses indicate significant trends such as a decrease in the total amount of ozone and an increase in ultraviolet radiation which was seen by a satellite (TOMS-EUV) in September and October which correspond to ozone-hole season over King Sejong Station. Increase of UV radiation due to the ozone depletion in the Antarctic has changed the growth rate of marine organisms. It may also result in changes to the productivity, biomass, and species composition of marine organisms which can affect the whole marine ecosystem. The recent ice-core drilling over Lake Vostok has been reviewed with emphasis on the four cycles of glacial stages over the past 420,000 years. It is time to show more interest in mainland Antarctica through investigations of the coring and vast ice sheet, terrestrial geology, and upper atmospheric sciences in order to understand the past environmental changes and to predict possible changes to the environment in the future.

• Proceedings of the Korean Society of Applied Pharmacology
• /
• 1994.04a
• /
• pp.276-276
• /
• 1994

지구 환경문제의 하나인 오존충의 파괴는 지구상에 분포되어있는 자외선량을 증가시키는 외에 지금까지 지상에 도달하지 않았던 단파장역의 자외선량의 증가를 초래하여, 이것에 피부암, 백내장등의 발병율 증가등의 건강 피해가 염려된다. 이들 발병기전은 아직 확실치 않으나 에너지가 큰 단파영역의 자외선에 폭로되면 세포내의 물분자의 이온화에 기인되어 발생하는 활성산소종이 막지질, 핵산. 단백질등에 산화적 손상을 가져와 이것에 돌연변이, 세포사를 초래하는 것이 그 원인의 하나라고 생각된다. 본 연구는 자외선 중 UVB의 조사로 인한 장해와 유도단백질을 찾아내어, 자외선의 유해성을 밝히는데 목적을 두었다. UVB를 농도별로 1회 hairless mouse에게 조사하여, 경시적으로 피부를 채취하여, UVB 조사로 인해 유도되는 단백질을 2차 전기영동법을 이용해 관찰하고. 유도단백질이 HSP인지를 면역염색을 통해 밝히고, 유도된 단백질을 protein sequence를 하여, 어떤 단백질인지 밝혔다.

• The Proceeding of the Korean Institute of Electromagnetic Engineering and Science
• /
• v.5 no.2
• /
• pp.3-9
• /
• 1994

Telemetry system which is mounted on the scientific sounding rocket KSR-420S transmits the informations about the performance of flighting rocket - distribution of the strain and temperature, accleration, pressure, velocity,attitude etc. - , the status of onboard circuit operating and measured data for scientific research such as ozone, ionosphere, x-ray etc. In this paper, PCM / FM telemetry system which was mounted on the KSR-420S is described.

• Korean Architects
• /
• s.504
• /
• pp.73-81
• /
• 2011

지구라는 한정된 자원을 사용하며 살아가는 인류에게 지구의 온난화와 에너지원의 고갈 등은 인류의 미래를 보장 할 수 없는 단계에 이르렀다. 몇 번의 오일쇼크와 오존층의 파괴 등 지구환경의 변화는 이제 남의 일이 아니다. 세계적인 관심사가 이제야 친환경으로 모아지는 것은 오히려 늦은 감이 있다. 건축계에서도 친환경 및 지속가능한 건축이란 명제가 화두가 된지도 몇 해가 지났다. 그러나 이직도 구체적인 실천이 미흡한 것도 사실이다. 그 이유로는 막연한 개념과 건축에의 구체적인 적용방법의 이해 부족에서 기인한 점도 적지 않다고 본다. 이에 "건축사"지에서는 우리협회의 "친환경건축설계아카데미 건축강좌"의 내용의 일부를 선정하여 요약 연재함으로써 친환경건축에 대한 회원들의 이해를 돕고, 친환경 건축이 활성화 될 수 있도록 하고자 한다. 실무에 도움이 될 수 있었으면 하는 바람이다.

• Korean Architects
• /
• s.503
• /
• pp.78-83
• /
• 2011

지구라는 한정된 자원을 사용하며 살아가는 인류에게 지구의 온난화와 에너지원의 고갈 등은 인류의 미래를 보장 할 수 없는 단계에 이르렀다. 몇 번의 오일쇼크와 오존층의 파괴 등 지구환경의 변화는 이제 남의 일이 아니다. 세계적인 관심사가 이제야 친환경으로 모아지는 것은 오히려 늦은 감이 있다. 건축계에서도 친환경 및 지속가능한 건축이란 명제가 화두가 된지도 몇 해가 지났다. 그러나 아직도 구체적인 실천이 미흡한 것도 사실이다. 그 이유로는 막연한 개념과 건축에의 구체적인 적용방법의 이해 부족에서 기인한 점도 적지 않다고 본다. 이에 "건축사"지에서는 우리협회의 "친환경건축설계아카데미 건축강좌"의 내용의 일부를 선정하여 요약, 연재함으로써 친환경건축에 대한 회원들의 이해를 돕고, 친환경 건축이 활성화 될 수 있도록 하고자 한다. 실무에 도움이 될 수 있었으면 하는 바람이다.

• Atmosphere
• /
• v.23 no.2
• /
• pp.123-130
• /
• 2013

Despite the extensive investigations to understand the difference between ground-based and space-borne measurements, there still exist differences in total ozone (TO) measured at those two different platforms. Comparisons were carried out for the first time between TO data obtaiend from the ground based Dobson and Brewer spectrophotometers, and the Ozone Monitoring Instrument (OMI) on board EOS-Aura satellite in a megacity site in Northeast Asia. The TO values retrieved by the OMI-DOAS (Differential optical absorption spectroscopy) algorithm tend to be lower than those measured by the ground based sensors in spring and summer as well as the low solar zenith angle condition. We found that such underestimation of the OMI-DOAS TO is caused by tropospheric ozone underestimated by the OMI-DOAS algorithm when tropospheric ozone are significantly enhanced.

• Journal of Environmental Science International
• /
• v.11 no.6
• /
• pp.497-506
• /
• 2002

A Photochemical-Trajectory model was used to understand the production of ozone in the atmospheric boundary layer. This model was composed of the trajectory and the photochemical models. To calculate trajectories of air parcels, winds were obtained from the three-dimensional nonhydrostatic mesoscale model (PSU/NCAR MM5V2), and the results were interpolated into constant height surfaces. Numerical integration in the trajectory model was performed by the Runge-Kutta method. The photochemical model consisted of chemical reactions and photodissociation processes. Chemical equations were integrated by the semi-implicit Bulirsch-Stoer method. We performed our experiments from 21 July to 23 July 1994 during the summer time for Seoul area. During the time of maximum ozone concentration in Seoul, four trajectories of air parcels which traveled from Inchon to Seoul were selected. Ozone concentrations estimated by two models are compared with observed one in Seoul area and the photochemical-trajectory model is better fitted than pure photochemical model. During the selected period, high ozone concentrations in Seoul area were more influenced by transferred pollutants from Inchon than emitted pollutants in Seoul.