• Proceedings of the Korean Association of Geographic Inforamtion Studies Conference
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• 2008.06a
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• pp.445-452
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• 2008

생태현상에 영향을 미치는 대표적인 환경인자로 방위, 경사, 고도 와 같은 지형인자를 들 수 있다. 따라서 생태현상의 파악 및 예측을 위해서는 이들 지형인자의 분석이 필요하다. 또한 지형인자 분석에 앞서 이용자료의 격자크기를 결정해야한다. 본 연구는 우리나라의 소나무 공간분포와 출현패턴을 생태학적으로 잘 설명하기 위한 DEM의 최적 격자크기를 제안하고, 궁극적으로는 생태적으로 중요한 최적의 공간구획방법을 찾고자하였다. 그 결과, 200m의 격자크기를 갖는 DEM은 주능선에 의해 방위를 동, 서, 남 또는 동, 남으로만 구분한 반면, 1m 격자크기의 DEM은 작은 주능선들에 의해 방위를 동, 서, 남, 북으로 구분하였다. 소나무는 일정규모 이하의 격자크기에서 모든 방위에 나타났지만, 격자크기가 증가함에 따라 북쪽과 남쪽 사면에서의 출현빈도는 점차 감소하였다. 또한, 200m 격자크기에서의 빈도분석은 육안분석에서처럼 소나무가 주로 서쪽과 동쪽 사면에 출현한다는 것을 보였다.

• Proceedings of the Korean Society of Soil and Groundwater Environment Conference
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• 2000.11a
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• pp.314-314
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• 2000

• Journal of the Korean Society of Marine Environment & Safety
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• v.18 no.5
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• pp.431-438
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• 2012

The representative risk evaluation techniques of the marine traffic environment are the FSA, PAWSA, & IWRAP. For the development of these techniques, the risk factors suitable to the marine traffic environment should be selected & the assessment criterion of the risk factors should be provided. The risk factors were selected as the factors that relate both to the frequency of casualty & to the consequence of casualty because the risk was defined as the frequency of casualty times the consequence of that casualty on the existing techniques. But, the risk factors relate to the consequence of casualty are excluded because the risk is defined as the sum of the risk factors including the frequency and the consequence by factors on this study. The 20 kinds of risk factors to compose the risk are selected and classified into 5 categories according to similar nature through the analysis of preceding study on the classification of the risk factors. Finally, as the foundation of risk assessment model's development for domestic marine traffic environment, the practical assessment criterion of the risk factors are suggested.

• Journal of Industrial Convergence
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• v.21 no.1
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• pp.187-192
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• 2023

In this study, trends in ICT education were investigated by analyzing the frequency of appearance of keywords related to machine learning and using conversion of iteration correction(CONCOR) techniques. A total of 304 papers from 2018 to the present published in registered sites were searched on Google Scalar using "ICT education" as the keyword, and 60 papers pertaining to ICT education were selected based on a systematic literature review. Subsequently, keywords were extracted based on the title and summary of the paper. For word frequency and indicator data, 49 keywords with high appearance frequency were extracted by analyzing frequency, via the term frequency-inverse document frequency technique in natural language processing, and words with simultaneous appearance frequency. The relationship degree was verified by analyzing the connection structure and centrality of the connection degree between words, and a cluster composed of words with similarity was derived via CONCOR analysis. First, "education," "research," "result," "utilization," and "analysis" were analyzed as main keywords. Second, by analyzing an N-GRAM network graph with "education" as the keyword, "curriculum" and "utilization" were shown to exhibit the highest correlation level. Third, by conducting a cluster analysis with "education" as the keyword, five groups were formed: "curriculum," "programming," "student," "improvement," and "information." These results indicate that practical research necessary for ICT education can be conducted by analyzing ICT education trends and identifying trends.

• Annual Conference on Human and Language Technology
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• 1997.10a
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• pp.28-33
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• 1997

이 논문에서는 문장 유사도 측정 기법과 말뭉치 정보를 이용한 문서요약 시스템을 구현하였다. 문서 요약은 문서에서 문장 단위로 단어를 추출하여 문장을 단어의 벡터로 표현하고, 문서 내 단어의 출현빈도와 말뭉치 내 단어의 사용빈도를 이용하여 각 문장의 중요도를 계산한다. 그리고 중요도가 높은 상위 몇 위의 문장을 요약문장으로 추출한다. 실험 결과, 문서내 단어빈도의 중요도를 낮추고, 말뭉치내 일반 사용빈도를 단어의 가중치에 추가했을 때 가장 좋은 효율을 보였다. 또 요약하고자 하는 문서와 유사한 말뭉치를 사용 했을 때 높은 효율을 보였다.

• Proceedings of the Korea Information Processing Society Conference
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• 2002.11a
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• pp.581-584
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• 2002

본 논문에서는 범주 내의 키워드 빈도에 의해 문서를 자동으로 분류하는 방법을 제안한다. 문서 자동분류 시스템에서는 문서와 문서를 비교하기 위해서 분류 자질(feature)에 적절한 가중치를 부여할 필요가 있다. 본 논문에서는 수작업으로 분류된 신문기사를 이용하여 자질의 가중치를 학습하는 방법을 사용하였다. 기존의 용어가중치 방법은 각 범주별로 가장 많이 등장한 명사부터 순서대로 추출하여 가중치를 주는 방법을 사용한 것에 비해 본 논문에서는 명사의 출현 횟수뿐만 아니라 출현위치를 함께 고려하여 가중치를 계산하는 방법을 제안한다. 또한 단어 빈도 가중치 방법의 변형된 방식을 사용함으로써 기존의 단어 빈도 가중치 방법과 비교하여 분류 정확도 측면에서 9%이상 성능 향상을 있음을 보인다.

• Journal of the Korean association of regional geographers
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• v.6 no.2
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• pp.57-69
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• 2000

The purpose of this study is to identify distributional characteristics of autumn droughts in occurrence frequency and to analyze synoptic characteristics on the surface pressure fields and 500hPa levels for autumn droughts in Korea. The regional distributions of autumn droughts in occurrence frequency vary according to the monthly regional distributions of the precipitation variabilities in Korea. In september, the southwestern and the mid western parts of Korean Peninsula have high rate of drought frequency, while the eastern coast regions have low rate of it. It means that the regional distribution of the drought frequency in september indicates west-high and east-low pattern. In October, the regional distribution of the drought frequency shows low variations on regions, but in November the inland areas have low rate of drought frequency, whereas the coastal areas have high rate of it. Negative anomalies appear on the surface and 500hPa level, around Korean Peninsula during the drought period of early autumn. Positive height anomalies areas are extended from the Sea of Okhotsk to the central part of the North Pacific Ocean. It indicates that the occurrence frequencies of blocking high and ridge are high around the Sea of Okhotsk. When the pressure system, such as migratory anticyclone, stays around the Korean Peninsula, a drought occurs. In late autumn drought, the positive anomalies appear in the west and the negative anomalies in the east are generated, respectively and therefore, zonal wind is strong around Korean Peninsula. In consequence, occurrences of droughts in early autumn have a different mechanism from those of late autumn.

• The Sea:JOURNAL OF THE KOREAN SOCIETY OF OCEANOGRAPHY
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• v.8 no.3
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• pp.307-316
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• 2003

Fish assemblage structure in a sheltered shallow water in the Southern Coast of Korea was examined monthly. Sampling was conducted in Doam Bay using a beam trawl between March 2001 and February 2001. A total of 53 fish species from 33 families were caught. Pinkgray goby (Chaeturichthys hexanema), ponyfish (Leiognathus nuchalis) and yellowfin goby (Acanthogobius favimanus) were the most frequent species, comprised 67.4％ of the total numbers captured. Snailfish (Liparis tanakai), yellowfin goby (Acanthogobius flavimanus) and pinkgray goby (Chaeturichthys hexanema) represented 50.8％ of the total biomass. While total abundance (number of individuals) and biomass were high in autumn and winter, species richness (number of species) and diversity were high in spring. Cluster analysis, based on monthly abundance data of the 14 most frequent species, showed that the species were separated into three different groups. Group A composed of pinkgray goby, yellowfin goby, robust tonguefish (Cynoglossus robustus) and scaly hairfin anchovy (Setipinna taty), which were year-round residents, and devil flathead (Onigocia spinosa), Red dragonet (Repomucenus lunatus) and ponyfish, which were abundant in autumn, group B surmullet (Upeneus japonicus), hairtail (Trichiurus lepturus) and gaff-topsail goby (Cryptocentrus filifer), which were abundant in summer, and group C grassfish (Liparis tanakai), spotted velvefish (Erisphex pottii), chameleon goby (Tridentiger trigonocephalus) and Richardson dragonet (Repomucenus richardsonii), which were abundant in winter and spring. A seasonal homogeneity of fish assemblage indicates that overall fish assemblage in Dom Bay is largely controlled by year-round residents.

• KOREAN JOURNAL OF CROP SCIENCE
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• v.2
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• pp.3-9
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• 1964

Root tips of wheat, soybean, cotton and barley were treated with cold temperature (12 or 24 hrs in $0^{\circ}C$ or 2$^{\circ}C$), 8-Hyd.exyquinolin (2 or 10 hrs in 0.03 or 0.1%) and colcllicine (2 or 10 hrs in 0.2 or 1, 0%), and the frequency of metaphase were observed. The results were summarized as follow; 1. Chilling the seminal roots before or after sooting from the seed significantly increased tile number of mitotic cells and the rate of metaphase cells to mitotic cells. The optimal duration of chilling seemed to be differ depending on the kinds of plant and 24 hours to be too long except wheat so far examined here. 9. 8-Hydroxyquinolin treatment, about 2 hours in 0.03%, increased the rate of metaphase cells. The higher concentration and the longer treatment of this chemical caused the lower frequency of mitotic cells generally. 3. Colchicine treatment, 2 to 10 hrs in 0.2 to 1.0%, increased the frequency of mitotic cells and the rate of metaphase cells. Colchicine treatment was same or superior than any other treatments on the increase of metaphase cells. 4. All the treatments examined here caused chromosome contraction with most serious in colchicine following by 8-Hydroxyquinolin and chilling. 5. The feasibility of general application of chilling under the check of proper temperature and proper duration depending on the kinds of crops were discussed.

• Korean Journal of Food Science and Technology
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• v.51 no.2
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• pp.176-181
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• 2019

The aim of this study was to analyze dieting practices and tendencies in 2016 using big data. The keywords related to diet were collected from the portal site Naver and analyzed through simple frequency, N-gram, keyword network, and analysis of seasonality. The results showed that exercise had the highest frequency in simple frequency analysis. However, diet menu appeared most frequently in N-gram analysis. In addition, analysis of seasonality showed that the interest of subjects in diet increased steadily from February to July and peaked in October 2016. The monthly frequency of the keyword highfat diet was highest in October, because that showed the 'Low Carbohydrate High Fat' TV program. Although diet showed a certain pattern on a yearly basis, the emergence of new trendy diets in mass media also affects the pattern of diet. Therefore, it is considered that continuous monitoring and analysis of diet is needed rather than periodic monitoring.