• 한국조경학회지
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• 제30권1호
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• pp.11-17
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• 2002

This paper compares the difference between the village groves in the Jinan settlement region and the Hamyang settlment region in Honam and the Youngnam mountainous region. The results are as follows: Fifty-one village groves in the Jinan legion were found and 40 village groves were found in the Hamyang region. It was established that the village groves in the Jinan region of Honam province were conserved better than those of Hamyang region of Youngnam province. In the Jinan area, the village groves were principally found in the Jinan-eup and the Hamyang regions, primarily in Seosang-myun and Aneui-myun. So it was determined that the village groves were distributed inequitably in the two regions. In L / W ratio, the Jinan region is 3.6 and Hamyang region is 2.0 Jinan is 1.8 times greater than Hamyang. Therefore, it was concluded that Jinan is stronger than Hamyang in linear function of the village groves. Stone stooge for complementation function was found in 11 village groves in the Jinan region and 6 village groves in Hamyang. So the percentage of the remaining stone storage is 15-20 % of all village groves. Regarding grove makeup, the village gloves in Jinan region is deciduous forest principally. In contrast, the groves of Hamyang are principally coniferous forest. The dominant tree of the Jinan-gun region is Zelkova serrata, but in Hamyang it is Pinus densiflrora. By number, Hamyang region has two times the trees than Jinan region. In density of stand, the Hamyang region is 76.2% higher than Jinan region. In height and diameter of trees, the Jinan region is greater than the Hamyang region. It was identified that RSI of both region is 40%. So in density of trees, both region are sparse. This paper has a limit in ideiltiting the differences between Yolmg-nam ar\ulcorner Hnam village groves because comparative review only examined two regions.

• 천문학회지
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• 제34권3호
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• pp.157-166
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• 2001

The molecular cloud associated with the H II region S301 has been mapped in the J = 1-0 transitions of $^{12}CO$ and $^{13}CO$ using the 13.7 m radio telescope of Taeduk Radio Astronomy Observatory. The cloud is elongated along the north-south direction with two strong emission components facing the H II region. Its total mass is $8.7 {\times} 10^3 M{\bigodot}$. We find a velocity gradient of the molecular gas near the interface with the optical H II region, which may be a signature of interaction between the molecular cloud and the H II region. Spectra of CO, CS, and HCO+ exhibit line splitting even in the densest part of the cloud and suggests the clumpy structure. The radio continuum maps show that the ionzed gas is distributed with some asymmetry and the eastern part of the H II region is obscured by the molecular cloud. We propose that the S301 H II region is at the late stage of the champagne phase, but the second generation of stars has not yet been formed in the postshock layer.

• 천문학회지
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• 제52권4호
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• pp.89-97
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• 2019

We demonstrate the subsurface origin of the observed evolution of the solar active region 10930 (AR10930) associated with merging and breakup of magnetic polarity regions at the solar surface. We performed a magnetohydrodynamic simulation of an emerging magnetic flux tube whose field-line twist is asymmetrically distributed along its axis, which is a key to merging and fragmentation in this active region. While emerging into the surface, the flux tube is subjected to partial splitting of its weakly twisted portion, forming separate polarity regions at the solar surface. As emergence proceeds, these separate polarity regions start to merge and then break up, while in the corona sigmoidal structures form and a solar eruption occurs. We discuss what physical processes could be involved in the characteristic evolution of an active region magnetic field that leads to the formation of a sunspot surrounded by satellite polarity regions.

• 인터넷정보학회논문지
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• 제19권1호
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• pp.67-76
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• 2018

본 논문은 영역 모니터링 질의를 효율적으로 처리하는 기법에 대해서 다룬다. 기존의 영역 모니터링 질의 처리를 위해서 사용된 중앙 집중식 기법은 이동 객체가 서버에 주기적으로 자신의 위치 업데이트를 전송하고, 서버가 질의 결과를 지속적으로 업데이트 한다고 가정한다. 그러나 이러한 가정은 많은 양의 위치 데이터 전송으로 인해 시스템 성능을 크게 저하시킨다. 최근, 영역 모니터링 질의 처리를 위한 몇 가지 분산 기법들이 제안되었다. 분산 기법에서 서버는 각 이동 객체에게 I) 작업 공간의 서브 공간인 상주 도메인과 ii) 몇 개의 인접 질의 영역을 할당한다. 각 이동 객체는 상주 도메인을 벗어나거나 질의 영역의 경계를 가로지를 경우에만 서버에게 자신의 위치를 전송한다. 상주 도메인 및 인접 질의 영역을 이동 객체에 할당하기 위해서 서버는 작업 공간을 반복적으로 동일하게 반으로 분할하여 생성되는 질의 색인 구조를 사용한다. 하지만 이와 같은 색인 구조는 불필요한 분할이 발생하게 되므로 시스템의 성능 저하를 발생시킨다. 본 논문에서는 불필요한 분할을 줄이기 위해서 적응 분할 기법을 제안한다. 적응 분할 기법은 I) 질의 영역과 결과 서브 공간의 공간적 관계와 ii) 질의 영역의 분포를 고려하여 동적으로 작업 공간을 분할한다. 본 논문에서는 기존의 색인 구조인 QR-tree에 본 논문에서 제안한 새로운 분할 기법을 적용하였으며, 시뮬레이션을 통해 제안 된 분할 기법의 효율성을 검증했다.

• 한국정보통신학회:학술대회논문집
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• 한국정보통신학회 2021년도 추계학술대회
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• pp.543-544
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• 2021

본 논문에서는 분산 구역에서 이동 싱크의 방문 변경 방식에 대해 고려한다. 원거리 구역으로 나누어진 센서 네트워크의 경우 이동 싱크 시스템은 각 지역을 정해진 방식에 따라 방문한다. 하지만 네트워크의 환경의 특성에 따라 이동 싱크 시스템의 방문이 비정기적이며 방문 지역 또한 달라질 수 있다. 따라서 센서 네트워크에서 수집되는 데이터의 특성에 따라 이동 싱크 시스템의 방문이 실시간적으로 변경되는 것을 고려한다.

• 대한기계학회논문집B
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• 제21권2호
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• pp.213-223
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• 1997

Premixed flame is better than diffusion flame to accomplish a high loading combustion. Since the turbulent characteristics of unburned mixture has a great influence on the flame structure, it is general that many researchers realize a high loading combustion with strengthening turbulent intensity of unburned mixture. Because turbulent premixed flame reacts efficiently on the condition of distributed reaction region, we made high turbulent premixed flame in the doubled impingement field. We investigated turbulent characteristics of unburned mixture with increasing shear force and visualized flames with direct and Schlieren photographs. And the combustion characteristics of flame was elucidated by instantaneous temperature measurement with a thermocouple, by ion currents with a micro electrostatic probe, by radical luminescence intensity and local equivalence ratio. Extremely strong turbulent of small scale is generated by impingement of mixture, and turbulent intensity of unburned mixture increased with the mean velocity. As a result of direct photographs, visible region of flame became longer due to increasing central direction flux. But as strengthed turbulent intensity, visible region of flame turned to shorter and reaction occurred efficiently. As strengthened turbulent intensity of mixture with increasing flux of central direction, maximum fluctuating temperature region moved to radial direction and fluctuation of temperature became lower. The reason is influx of central direction which caused flame zone to move toward radial direction, to maintain flame zone stable and to make flame scale smaller.

• International Journal of Industrial Entomology and Biomaterials
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• 제47권2호
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• pp.99-114
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• 2023

Patanga japonica Bolívar, 1898 (Orthoptera: Acrididae) is listed as a climate-sensitive indicator species in South Korea and is called southern group of insects in that the main distributional range is southern region of South Korea and Asian continent. In South Korea, thus, the species was distributed mainly in southern region of South Korea including southward a remote Jeju Island, but recently the species has often been detected in mid to northern region of South Korea, implying northward range expansion in response to climate change. Understanding the characteristics of the changes in genetic diversity during range expansion in response to climate change could be a foundation for the understanding of future biodiversity. Thus, in this study, we attempted to understand the changing pattern of the genetic diversity of the P. japonica in newly expanded regions. For the purpose of study, we collected 125 individuals from seven localities throughout South Korea including two newly distributed regions (Pyeongtaek and Yeongwol at ~37° N). These were sequenced for a segment of mitochondrial cytochrome oxidase subunit I (COI) and analyzed for genetic diversity, haplotype frequency, and population genetic structure among populations. Interestingly, northward range expansion accompanied only haplotypes, which are most abundant in the core populations, providing a significant reduction in haplotype diversity, compared to other populations. Moreover, genetic diversity was still lower in the expanded regions, but no genetic isolation was detected. These results suggest that further longer time would take to reach to the comparable genetic diversity of preexisting populations in the expanded regions. Probably, availability of qualified habitats at the newly expanded region could be pivotal for successful northward range expansion in response to climate change.

• 한국지역지리학회지
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• 제9권4호
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• pp.493-504
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• 2003

춘천지방의 청동기시대 유적과 유물은 주로 범람원에 분포한다. 이 지역의 범람원은 대부분 고도가 높아 홍수시에도 물에 잘 잠기지 않는 자연제방으로 이루어져 있다. 자연제방은 주변의 구릉지나 곡간충적지보다 농경에 있어 훨씬 유리한 조건을 갖추고 있다. 청동기시대 춘천지방의 주민들은 사연제방에 거주하면서 농경에 종사했을 가능성이 매우 높다. 자연제방의 지형적인 특성과 토양을 고려하면 당시 이 지역에서는 벼농사보다 밭농사 중심의 농경이 이루어졌을 것으로 생각된다.

• 한국정밀공학회지
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• 제21권6호
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• pp.94-101
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• 2004

From the Beckmann's reflection model of wave incident, reflected light from a surface is known to have not only specular but also diffuse components. The specular component dominant a surface for a mirror-like surface is distributed on the almost the same area as the spot on the surface, but the diffuse component region dominant f3r a rough surface spreads scattered on the larger areas than the spot. Therefore, statistic parameters from the scattered light distribution are more meaningful in the diffuse region, while the magnitude of rather meaning in the specular region. In usual, there need two sensors to acquire two kinds of information: Photo-detector for light intensity magnitude and image sensor for light intensity distribution. But dual sensor scheme requires a beam splitter usually to feed light to each sensor, and moreover there is not a combination rule to relieve the different sensor characteristics. In this study a new method is proposed for acquisition of the dual information using only an image sensor. Specular region is established on an image area being distinguished from a diffuse component, and laser power is adjusted so that no pixel of the image sensor in the specular region is saturated. Simulation based on the light reflection theory and the experimental results are quite well matched, and thus the proposed method was proved to be very useful for mirror-like surface measurement.

• 한국컴퓨터정보학회논문지
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• 제27권4호
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• pp.37-43
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• 2022

본 논문에서는 2019년 12월부터 2020년 7월까지 약 8개월간 유통되었던 코로나19와 관련된 뉴스데이터를 이용하여 일자 및 지역별로 단어에 대한 빈도를 구하고, 결과를 활용하여 코로나19 환자에 대한 현황 데이터와의 상관관계를 시각화하였다. 뉴스데이터는 한국언론진흥재단에서 운영하고 있는 뉴스 빅데이터 시스템 '빅카인즈'에서 수집된 데이터를 활용하였다. 본 논문에서 제안하는 시각화 시스템은 지역과 기간을 선택하면 분석한 결과를 이용하여 전체 지역 대비 선택한 지역의 뉴스 빈도수, 선택한 지역의 주요 키워드, 주요 키워드의 지역별, 일자별 변화 등을 보여 주고 있다. 이러한 시각화를 통하여 이전에 발생하였던 사건에 대해 주요 키워드와 코로나19 확진자 및 감염자 추이를 확인할 수 있다.