• 현장농수산연구지
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• 제24권4호
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• pp.30-34
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• 2022

본 연구는 일조방해에 의한 광환경의 변화가 절화 장미의 생산성과 품질에 미치는 영향을 분석하기 위해 절화용 스탠다드 장미 'Monet' 품종에 인위적으로 차광 처리하여 일조를 방해하고 일조방해 시간에 따른 장미의 절화수량과 생육특성을 조사하였다. 일조방해 시간에 따른 절화 장미 'Monet'의 단위면적(3.3m²)당 절화수량은 무처리구에서 40본인 반면 4시간, 8시간, 12시간 처리구에서는 각각 32본, 29본, 25본으로 일조방해 시간이 증가함에 따라 절화수량이 감소되는 경향을 나타내었다. 절화 장미의 품질과 관련된 절화 특성의 경우에도 무처리구에 비해 12시간 처리구에서 화폭과 화고, 꽃잎의 길이와 폭 등 모든 특성에서 10~20% 정도 감소하였다. 또한 절화 장미의 상품성을 결정하는 화경장과 꽃대 굵기, 절화중 등의 생육특성도 일조방해 시간이 증가됨에 따라 감소하는 경향을 보였다. 이에 반해 개화소요일수는 24.3일에서 27.7일로 14.0% 증가하는 등 일조방해 시간이 증가됨에 따라 전반적인 생육은 위축되고 개화는 지연되는 특성을 나타내었다. 본 연구의 결과에서 일조방해 시간이 증가함에 따라 꽃의 크기가 감소하고 화경장 및 절화의 생체중 등이 감소한 것은 일조방해로 인해 일평균 광합성광량자속밀도(PPFD)가 감소하고 이에 따라 총광합성량이 감소하면서 장미의 생장과 발달에 필요한 양분을 충분히 공급받지 못했기 때문으로 판단된다.

• 한국환경성돌연변이발암원학회지
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• 제16권1호
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• pp.35-42
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• 1996

Aragonite is one of polymorphs of calcium carbonate of which main form is calcite. We found that white precipitate is formed in much amount by boiling underwater of Inchon, Korea and confirmed that it is aragonite. This study is to evaluate the dimensional characteristics, solubility, acid resistance of aragonite and the cytotoxicity, cell division disturbance and cell transforming ability of it on BALB/3T3 cells. The results are as follows: Lengths of the aragonite were reduced to the 72.7% and 22.7% respectively after 5 months and 7 months of intrapleurai injection to the Sprague-Dawley rat. Strong acid such as 1M HCl dissolved the aragonite instantly but weaker acid pH 2.0 or more could not dissolved aragonite easily. The result of cell growth inhibition showed that cell numbers were decreased as log-doses of treatment of the aragonite were increased 24 hours, 48 hours, and 72 hours later. Cell plating efficiency after the aragonite treatment also showed dose-dependent decrease. Multinuclear giant cell formation was increased in the aragonite treated cells until ID$_{50}$ and after the dose the multinucleate cells were decreased, but remained much higher than negative control cells. Morphological transformation assay showed that the aragonite did not induce transformation in all treated doses.

• 한국환경복원기술학회지
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• 제13권5호
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• pp.51-58
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• 2010

This study was done to recommend a method for conserving the habitat of Amblyotropis verna grown naturally in campus of the Kyungpook National University at Daegu city. Vegetation characteristics and morphological characteristics of each individual were analyzed for the condition of the population at the growing season from May to June in 2010. Totally 11 vegetation data were collected and analyzed, and one vegetation community including Amblyotropis verna (Amblyotropis verna-Zoysia japonica community) was found. We found that the growing condition was not good with severe stamping and disturbance. The location-determining method by PCoA analysis showed the physical texture in soil was a critical factor determining the spatial distribution of the Amblyotropis verna-Zoysia japonica community. And the analysis of morphological characteristics found that light condition and soil hardness were the main ecological factor determining the size and form of each individual. Finally, this study recommend that minimizing impacts by human stamping and artificial disturbance and reducing the water stress were the best ways for the conservation of Amblyotropis verna habitats.

• Journal of Forest and Environmental Science
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• 제35권1호
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• pp.6-24
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• 2019

We have investigated the impact of anthropogenic and natural disturbances on regeneration, composition and diversity in some temperate forests of Bhagirathi Catchment Area of Garhwal Himalaya. The forests were categorized on the basis of canopy cover and magnitude of disturbance into highly, moderately and least disturbed classes. The dominant tree species at lower elevation were Pinus roxburghii and Quercus leucotrichophora, while Abies pindrow, Q. semecarpifolia and Rhododenron arboreum were the dominant species at the upper elevational forests. Cythula tomentosa and Indegophera heterentha were the dominant shrub species present in all the forests. Similarly, Circium wallichii and Oxalis corniculata were the dominant herb species found in all forests (except Q. leucotrichophora forest), whereas Thalictrum foliolosum and Viola pilosa were noticed in each forest (except P. roxburghii forest). The tree density values oscillated between $400{\pm}10\;trees\;ha^{-1}$ to $750{\pm}89.1\;trees\;ha^{-1}$ which generally decreased from lower to higher disturbance regimes however, the total basal cover value was highest ($88.1{\pm}23.6m^2\;ha^{-1}$) in highly disturbed forest and lowest ($25.8{\pm}2.2m^2\;ha^{-1}$) in moderately disturbed forest. The shrub and herb densities were maximum in least disturbed forest, while the young regenerating individuals i.e., sapling and seedling were observed increasing from high to low disturbed forests which reflected that the forest fragmentation adversely affected the regeneration. However, A. pindrow and P. roxburghii were found invariably encroaching the habitats of R. arboreum and Q. leucotrichophora at various altitudes, respectively. The Canonical Correspondence Analysis clearly indicated that the elevation and lopping intensity have more impact on trees, while shrub and herbs were more influenced by elevation, canopy cover, light attenuation and soil erosion. Pinus roxburghii was the only species which was affected by heavy litter removal and forest fire.

• International Journal of Fuzzy Logic and Intelligent Systems
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• 제4권1호
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• pp.63-69
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• 2004

In this paper, we propose a general framework for sensor data fusion applied to control systems. Since many kinds of disturbances are introduced to a control system, it is necessary to rely on multisensor data fusion to improve control performance in spite of the disturbances. Multisensor data fusion for a control system is considered a sequence of making decisions for a combination of sensor data to make a proper control input in uncertain conditions of disturbance effects on sensors. The proposed method is applied to a typical control system of a flexible link system in which reduction of oscillation is obtained using a photo sensor at the tip of the link. But the control performance depends heavily on the environmental light conditions. To overcome the light disturbance difficulties, an accelerometer is used in addition to the existing photo sensor. Improvement of control performance is possible by utilizing multisensor data fusion for various output responses to show the feasibility of the proposed method in this paper.

• 대한전기학회논문지:전기기기및에너지변환시스템부문B
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• 제54권5호
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• pp.245-252
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• 2005

The fuel cell systems are one of very useful energy sources. The systems have advantages as renewable and environmental sources. To obtain AC components from fuel cells, it needs inverters. A multilevel converter is used as a power conversion system for a high power fuel cell system. Through harmonic analysis, it is shown that the harmonic components and THD increase while a fundamental component of output decreases as voltage droop increases. To solve the voltage disturbance problems, three different approaches are investigated in this paper; installation of a boost converter at the fuel cell output, control of pulse widths, and use of ultracapacitors. The proposed three approaches are analyzed and compared through simulation and experimental results.

• 한국관개배수논문집
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• 제17권2호
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• pp.42-48
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• 2010

This study was carried out to investigate the changing of benthic macrobenthos community in Saemangeum subtidal area. The distribution of macrobenthic community is important to assume the benthic environment in study area. Macrobenthic community was investigated three times in 2007 (March, June and September) in the Saemangeum subtidal area. The mean density of macrobenthos was $345{\sim}838ind./m^2$ and the most dominant taxa was benthic polychaete. Opportunistic species such as E.cordatum, T.fragilis, H.filiformis, and Tharyx sp. were shown high appearance rate in study area. The dominance of these opportunistic species suggest that the benthic environment of study area was unstable due to environmental disturbance. But, there are only few point that these species were recorded high densities, and also equilibrium species was dominant, too. It means disturbance and un stability of benthic environment in Seamangeum was not serious yet. so the dynamics and trends of these opportunistic species should be concerned.

• 한국정밀공학회지
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• 제24권4호
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• pp.131-137
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• 2007

Electronic Speckle Pattern Interferometry(ESPI) is a common method for measuring out-of-plane deformation and in-plane deformation and applied for vibration analysis and strain/stress analysis. However, ESPI is sensitive to environmental disturbance, which provide the limitation of industrial application. On the other hand, Shearography based on shearing interferometer which is insensitive to vibration disturbance can directly measure the first derivative of out-of-plane deformation. In this paper a technique that extract out-of-plane deformation from results of shearography by numerical processing is proposed and measurement results of ESPI and Shearoraphy are compared quantitatively.

• 근관절건강학회지
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• 제4권2호
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• pp.163-176
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• 1997

Chronic fatigue syndrome Is a syndrome of unknown etiology and pathophysiology characterized by severe, chronic, debilitating fatigue as main symptom and numerous additional symptoms such as joint and muscle pain, headache, sleep disturbance. According to recent researches, it was suggested that chronic fatigue syndrome was developed by disturbance of interaction between neuropsychiatric system and immune system due to environmental factors and stress. Many patients experience gradual improvement but complete recovery from disorderd state is rare. There was no research elucidating the exact pathogenetic mechanism of chronic fatigue syndrome, so there was no established treatment. Several controlled studies about treatment was reported, but its results was not effective in all patients with chronic fatigue syndrome. For chronic fatigue syndrome, a comprehensive approach to physical, psychological, and social aspects is needed.

• 환경정책연구
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• 제7권3호
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• pp.141-160
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• 2008

본 연구는 속리산 국립공원에서 쌍곡계곡 지역과 법주사 지역 내에 위치한 지역 중에서 인간의 의한 교란이 가장 큰 도로개설지역, 교란이 중간 정도인 등산로지역 그리고 간섭이 거의 없는 출입통제지역을 선택하여 산림생태계에서 인간의 교란 정도에 따른 조류군집의 차이를 연구하였다. 번식기와 비번식기의 조사(n=12)에서 조류의 종수와 개체수, 종다양도 및 밀도에서는 세 지역 사이에 유의적인 차이가 나타나지 않았다. 그러나 번식기의 조사(n=9)에서는 조류의 종수(Kruskal Wallis, $x^2$=10.32, p=0.006)와 개체수(Kruskal Wallis, $x^2$=7.118, p=0.028) 및 종다양도(Kruskal Wallis, $x^2$=9.847, p=0.007)가 인간에 의한 교란이 중간정도인 등산로 지역에서 가장 높게 나타났다. 그러나 번식기 조류 군집의 영소 및 취식 길드 분석에서는 세 지역 사이에 영소 및 취식 길드 분포비율은 차이가 나타나지 않았다. 영소길드는 세 지역 모두 나무구멍 영소길드가 가장 높았고, 취식길드는 수관층 취식길드가 가장 높게 나타났다.