• 한국미생물·생명공학회지
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• 제25권3호
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• pp.240-247
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• 1997

Bacillary is the most common form of H. pylori observed during human infection. However, it is known that the morphology change of H. pylori from bacillary to coccoid can be occurred with a response to the environmental stresses such as the nutrient depletion, accumulation of toxic metabolites, pH alteration, and exposure to antimicrobial agents. The coccoid form of H. pylori, which is viable but non-culturable in vitro, seems to be the major cause of antibiotic resistancy and high reinfectability of H. pylori. In this regard, we studied the environmental factors that can induce the morphological change in vitro of H. pylori, and the change of fatty acid composition of plasma membrane. The morphological change from bacillary to coccoid could be observed with the depletion of nutrients, pH variation and reactive oxygen species added in the culture media. This morphologic conversion was paralleled by a dramatic decrease in unsaturated fatty acids and an increase in saturated fattv acids of plasma membrane. The change in composition of membrane fatty acid seems to be a kind of protection mechanism of H. pylori against these environmental stresses.

• 한국미생물·생명공학회지
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• 제21권6호
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• pp.594-599
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• 1993

In the course of screening for microbial metabolites employing human cancer cell line, we identified a mycelial extract of Streptomyces sp. 1365, which are effective on growth inhibition and morphological change of MCF-7, human breasr cancer cell line. By repeased column chromatography and recrystallization process, yellow needle crystals were obtained as an active compound and identified as resistomycin by spectral analysis.

• 한국농공학회:학술대회논문집
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• 한국농공학회 2000년도 학술발표회 발표논문집
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• pp.365-370
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• 2000

Sea dike construction for the tidal flat reclamation works in estuary and coast may change the characteristics of tidal motion and wave conditions in the region. In turn, a new hydraulic condition provides the impacts on sediment transport pattern and forms a new morphological environment. Also, morphological changes during the closure works of sea dike are closely related with a safy of sea dike. Therefore, the prediction of morphological changes is required secure the safe closure work and the economic design of sea dikes. To investigate morphological changes due to sea dike construction, hydrodynamic changes of tides and waves have to be evaluated, then sediment transport and sea bottom changes are computed. Mathematical modelling is required for representation of interrelation of tidal motion, wave and sediment transport. In this study, numerical model MORSYS is applied to compute the hydrodynamics and morphological changes around the closure gap for Saemankuem dike. This model allows a flexible integration of the module for waves, currents, sediment transport and bottom changes.

• 한국지역지리학회지
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• 제13권2호
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• pp.119-128
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• 2007

입도경향분석은 퇴적물 입도경향으로부터 퇴적물의 순이동방향을 도출하는 방법론이다. 입도경향으로부터 도출된 퇴적물의 순이동방향이 낙동강 하류의 삼각주연안 사주점의 지형변화 패턴과 잘 부합한다면 입도경향분석은 삼각주연안 사주섬의 지형변화를 연구하는 과정에서 효과적인 접근법이 될 수 있을 것이다. 이 연구는 Gao and Collins(1992)의 '퇴적물 이동벡터'법에 따라 도출한 퇴적물 순이동방향이 낙동강의 삼각주연안 사주섬의 지형변화를 이해하는 데 적절히 활용될 수 있는지를 검토한 것이다. 연구결과 퇴적물 이동벡터로부터 얻어진 퇴적물 순이동방향은 대체로 항공사진을 통해 추출한 지형변화 패턴를 반영하고 있음을 확인하였으나 지형변화가 급속히 일어나는 지역에서는 그렇지 않았다. 이는 입도경향분석을 통해 얻은 퇴적물 순이동방향이 대표하는 프로세스의 시간적 규모와 지형변화 분석자료의 시간적 규모, 지형변화율 등의 요소의 부합, 불부합 여부 등이 관련되어 있다고 판단된다. 입도경향분석을 낙동강 삼각주연안 사주섬에 적용하고자 할 경우 설명가능한 시간적 규모를 고려한 신중한 접근과 해석이 필요하다고 사료된다.

• 한국초지조사료학회지
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• 제35권4호
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• pp.283-289
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• 2015

수확시 숙기와 조제방법이 호밀 라운드베일 사일리지의 건물 손실률과 형태변화에 대한 영향을 구명하기 위하여 3가지 시험을 수행하였다. 호밀은 3번의 생육단계에 맞춰 수확하였으며 (수잉기, 출수기 및 개화기) i) 예건 (비예건, 단기예건, 장기예건)에 따른 변화, ii) 유산균첨가제 (무처리, 첨가제 A 및 첨가제 B) 처리에 따른 변화, iii) 비닐색 (백색, 흑색, 녹색)에 따른 변화를 관찰하였다. 수잉기 및 비예건 처리구에서 저장 2개월 후의 형태 변화가 심하게 나타났다. 그러나 출수기 이후의 수확 처리구에서는 변화정도가 심하지 않았다. 첨가제 처리는 사일리지의 형태변화와 건물 손실률을 감소시켰다. 건물 손실률은 수확이 지연되거나 첨가제 처리로 유의적으로 감소되었다. 수잉기 처리에서는 형태변화가 심하게 관찰이 되었는데 첨가제 처리구가 비 처리구보다 형태변화가 더 심하게 일어났다. 흑색비닐 처리는 다른 비닐색에 비해 형태변화가 심하게 일어났 으나 건물 손실률은 비닐색에 따른 차이가 없었다. 상관관계에서는 수확시 숙기와 예건기간이 형태변화와 정의 상관이 있는 것으로 나타났다. 이상의 결과를 종합하여 볼 때 건물함량은 사일리지의 형태변화에 영향을 주는 가장 큰 요인으로 나타났다.

• 대한방사선기술학회지:방사선기술과학
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• 제41권5호
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• pp.463-469
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• 2018

Morphological information such as shape and margin of micro lesion is important information for diagnosis of disease in clinical imaging. In this study, we investigated the morphological changes of the micro lesions by comparing the contrast and area in grid suppressed DR images according to grid frequency. In the profile analysis of the image, the mass showed an average intensity variation of 8.6 ~ 72.4 after suppression, The higher the grid frequency, the more the contrast was increased. However, in the images obtained using 103 lp / inch, which is a grid frequency less than the sampling frequency, the contrast of the mass in the vertical direction decreased after suppression. In the binary image, the area change of the mass was also large. As a result, the shape, size, and margin of the mass changed. In the case of very small calcification, the higher the grid frequency is the larger the change in contrast, so that a clear image can be obtained in the post-suppression image. However, we could confirm that the margin of the lesion was blurred and the lesion was lost in some of the images using the 103 lp / inch grid. The higher the frequency of the grid, The change of the contrast of fiber occurred largely and clear boundary was confirmed. The decrease of the number of pixels was small and morphological change was small. In conclusion, when using a grid frequency that is not suitable for the sample frequency, morphological changes or lesion loss of micro lesions in the post- suppression image may give the possibility of misdiagnosis in diagnosis and differentiation of the image.

• 한국산림과학회지
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• 제98권2호
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• pp.156-162
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• 2009

Nebkhas are widely distributed in farming-pastoral zones, typical grassland and desert margins. In the southeast of the Inner Mongolia Plateau, it is mainly distributed at the leeward of cultivated land and alluvial fan, severe deterioration rangeland and around residential points. Through the field measurement and statistical analysis of Caragana microphylla Lam. Nebkhas morphological parameters (length, width and height of Nebkhas are included), the results show that there were close correlations between the Nebkhas morphological parameters. The ranges of height and width of Nebkhas changed dramatically and have reached up to 11.44 m and 7.97 m respectively, however, the change range of height was relatively smaller and just 1.09 m. The morphological parameters change of the same type Nebkhas in the same region was large ranging from 0.56 m in height, 3.56 m in width to 6.96 m in length, while the morphological characteristics of the same type Nebkhas in different regions were much similar. A correlation between length and width was significantly positive, but the correlations between height and length, and between height and width were much more complicated. It can be concluded that the Nebkhas in Zhengxiangbai Banner and Taipusi Banner were at the initially growing stage, while the Nebkhas in Huade County belonged to a transitional stage from the growing phase to the stabilizing phase. The changing regularity of distance between Nebkhas in along-wind direction was not consistent.

• 한국관개배수논문집
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• 제17권2호
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• pp.49-56
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• 2010

This study was carried out to survey for morphological change of lower tidal flat near Byunsan-Gosapo beach using single-beam echosounder and sound velocity profiler. Since October 2009 in the center of the region, the erosion occurred about 10~50cm, while either side of the study area is little change. Erosion occurred at the beach, each beach area in the southwest area rather than further accumulation occurred sandbank formed. Observed in the study area near the center of the erosion is the result of ongoing changes that were temporarily due to seasonal changes is not clear. However, the northwestward waves were expected to be a major source of erosion. Because of this, continue to observe the terrain and the local ocean circulation studies will be required.

• 한국언어정보학회지:언어와정보
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• 제6권2호
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• pp.57-82
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• 2002

This study explores the lexical-semantic structure of derived causative verbs in Korean based on Pustejovsky(1995)'s Generative Lexicon Theory (GL). Morphological causative verbs are derived from their root stems by affixing ‘-i, -hi, -li, -gi’ in Korean and the meanings of derived predicates are closely related to the meanings of their root verbs. In particular, the change of the ARGUMENT STRUCTURE by morphological derivation leads to the change of the EVENT STRUCTURE. The ARGUMENT STRUCTURES of derived causative verbs include a causer argument, which is added to the ARGUMENT STRUCTURE of their root verbs by means of the causative derivation. Their EVENT STRUCTURE has a headed process related to a causer and its result is the event which their root verbs denote. This approach can also suggest that the (in)directness of causative is dependent on is the semantics of its root verb.

• Ecology and Resilient Infrastructure
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• 제2권4호
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• pp.317-323
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• 2015

본 연구는 장기하상변동 모의를 이용하여 댐 하류 하천에서의 하상변동이 어류 물리서식처에 미치는 영향에 대하여 연구하였다. 이를 위하여 흐름모형은 준정류 모형을 이용하였으며, 서식처 모형은 서식처 적합도 지수 (HSI) 모형을 이용하였다. 장기하상변동 모의를 위하여 Exner 방정식을 이용하였으며 하상재료 입도분포의 변화를 고려하였다. 내성천 영주댐 하류에서 모의결과 침식과 장갑화가 진행되었으며 이에 따라 피라미의 물리서식처가 변하게 되었다. 지형과 하상재료의 변화가 어류 물리서식처에 영향을 끼치는 것을 확인할 수 있다.