• Proceedings of the Korea Information Processing Society Conference
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• 2004.05a
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• pp.655-658
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• 2004

본 논문은 구문패턴과 의미망을 이용하여 복합명사를 생성하는 방법을 제안하고, 제안된 방법으로 설계 구현된 시스템, 복합명사 생성기(Compound Nouns Generator : CNG)를 제시한다. 복합명사에 관한 연구는 형태적, 구문적, 의미적인 관점에서의 분석과 생성에 이르기까지 폭넓게 진행되고 있다. 본 논문에서는, 사전에 등재된 표제어만을 복합명사로 인정하고, 나머지는 1차적으로 명사 연결구로 파악한다. 그리고 이것을 다시 신형 복합명사와 명사 연결구로 파악함으로써, 복합명사에 대한 명확한 기준을 제시하여 자연언어처리, 정보검색 등에서 효율성을 높이고자 하였다. 본 논문에서 제안한 시스템은 복합명사 확장을 위해 구문패턴을 자동 생성함으로써 시스템의 융통성을 향상시키고, 구문패턴과 의미망을 통해 생성된 복합명사와 명사 연결구의 말뭉치상의 빈도정보를 이용함으로써 고빈도의 명사 연결구가 복합명사로서 굳어질 수 있는 가능성을 보여주기도 한다. 또한, 구문패턴과 의미망을 통해 생성된 명사 연결구를 비교하여 생성된 신형 복합명사는 구문패턴에 의해 뜻풀이가 자동으로 생성된다.

• Asian Journal of Turfgrass Science
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• v.24 no.2
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• pp.79-87
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• 2010

Research was initiated to investigate the early establishment characteristics and germination patterns of perennial ryegrass (PR, Lolium perenne L.). Eight cultivars of PR were evaluated in the study. Experiment was conducted under a room temperature condition of $6^{\circ}C$ to $23^{\circ}C$ (natural conditions). Daily and cumulative germination patterns were measured and analyzed on a daily basis. Significant differences were observed in germination pattern, days to the first germination, days to 50% germination, days to 75% germination, and germination percentage with different environments and cultivars. Germination percentage was variable with cultivars at the end of study. It was 66.25 to 93.50% under natural conditions. There were considerable variations in the early germination characteristics and germination pattern among the entries according to different conditions. The first germination was initiated between 3 and 5 DAS (days after seeding) under ISTA (International Seed Testing Association) conditions. But it started between 6 and 8 DAS under natural conditions, being 2 to 4 days later as compared with that under ISTA conditions. It was 8 to 12 DAS that reached to days to the 50% germination, which was 2 to 5 days after the first germination. Days to the 75% germination were 10.08 to 13.70 DAS under natural conditions, being 2.07 to 5.70 days slower as compared with ISTA conditions. 'Pennant II' was the fastest cultivar. But the slowest was 'Catalina II' that was 3.62 days later than 'Pennant II' under natural conditions. Considering days to the first germination, days to 75% germination, and germination pattern etc, 'Pennant II' and 'Brightstar II' were regarded as excellent cultivars under both conditions. From this study, information on differences in germination characteristics and patterns would be usefully applied for golf course design and construction, when established with PR.

• Proceedings of the Korea Multimedia Society Conference
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• 2004.05a
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• pp.656-659
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• 2004

최근 많은 연구에서, 동일한 영상그룹들로부터 추출된 저수준의 특징들을 이용해서 고수준의 정보를 분석한 뒤, 이를 이용해서 영상을 분류하는 방법들을 소개하고 있다. 이러한 연구는 CBIR의 인덱싱에서 저수준의 특징만을 사용할 때 발생하는 의미적인 차이(semantic gap)문제를 해결하여, 검색의 효율을 높일 수 있게 한다. 하지만 이들 연구는 대부분 전경(scenery)영상만을 대상으로 하고 있다. 한편 영상을 객체 단위로 다루는 것은 CBIR의 성능을 크게 향상 시킬 수 있는 요인이 된다. 왜냐하면 대부분의 사용자는 관심있는 객체가 포함된 영상을 검색하기 원하기 때문이다. 본 논문에서는 영상의 객체를 인공객체와 자연객체로 분류하는 방법을 제안한다. 인공객체의 경우 자연객체에 비해 상대적으로 직선형태의 에지가 많이 발견되며 객체를 구성하는 패턴이 규칙적이고 방향성을 가진다. 또한 인공객체는 자연객체에 비해 객체영역의 경계가 직선에 의한 단순한 형태로 나타난다. 이러한 특징들을 EDH(edge Direction Histogram)의 에너지, EDAS(Energy Difference of Adjacent Sector)와 가버 필터를 통해 추출하여 분류에 이용한다. 실험을 통하여 각 특징들을 개별적으로 사용해서 76%에서 84% 사이의 분류 정확성을 얻었으며, 제안한 머징 방법을 이용하여 최종적으로 약 90%의 정확성으로 분류하였다.

• Proceedings of the Korea Information Processing Society Conference
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• 2008.11a
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• pp.726-729
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• 2008

자연언어 데이터베이스 인터페이스는 자연언어를 데이터베이스의 쿼리(query)로 바꿔주는 시스템이다. 이를 통해, 데이터베이스에 잘 모르는 일반 사용자도 쉽게 데이터베이스를 이용할 수 있다. 본 논문에서는, 학술자료 검색에 사용되는 자연언어 데이터베이스 인터페이스 시스템을 소개한다. 패턴과 구문분석 기법을 동시에 사용하여 속도와 확장성을 모두 만족하게 한다.

• Journal of the Korean Society for information Management
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• v.33 no.2
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• pp.157-176
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• 2016

Cited-by Linking Service is one of the CrossRef's information services that allows you to discover how your publications are being cited and to incorporate that information into your online publication platform. This study tries to investigate citation patterns in the field of both Natural Science and Engineering using all of DOI assigned articles and Cited-by Linking data which are accumulated and managed by KISTI. The investigating approach is designed to verify the theory of 1) cognitive accessibility, 2) 'perceived quality and significance' and 3) 'subject relativity'. For cognitive accessibility verification the fulltext language portion of Korean and English between "Cited DOI Source Data" and "NOT Cited DOI Source Data" was compared. For perceived quality and significance verification the availability of the "Cited DOI Source Data" and "NOT Cited DOI Source Data" from SCIE and SCOPUS was employed. For subject relativity DOI data were classified and analysed on the basis of OECD subject classification scheme. Findings are that global citability is closely related to the fulltext language of the articles and their quality and significance. And in the natural science field most of citations are from the same subject categories, while relatively more citations are from other subject categories in the engineering field.

• Journal of the Korean association of regional geographers
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• v.2 no.1
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• pp.151-164
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• 1996

The regional division by the characteristics of the drainage patterns is important to understand its physical environment comprehensively, because the drainage network develops in reflecting characteristics of geological, geographical and climatical features in the drainage basin keenly. This study is the attempt to divide physical region in China whose drainage pattern is diverse. Chinese drainage basin is mainly divided into the interior drainage basin and the peripheral drainage basin. The interior drainage basin is divided into (1)the deranged pattern and (2)the centripetal pattern. The peripheral drainage basin is divided into (1)the dendritic pattern, (2)the parallel pattern, (3)the radial pattern and (4)the anastomatic pattern. Drainage patterns of the interior drainage basin are formed by affecting geographical features and climatic conditions mainly. In the peripheral drainage basin, drainage patterns are formed by other factors: the parallel pattern is connected with geological structure lineament by tectonic movement, the radial pattern with changes of the river channel resulted from the Yellow River's overflow, the anastomotic pattern with human's activities. The distributional features of the physical region in China are as follows: The deranged pattern appears in Zangbai Plateau, the centripetal pattern does in arid basin of the northwest China. the parallel pattern does in Hengduan mountains affected strongly by tectonic movement between Yangtze paraplatform and Indian Plate, does in the upper stream of Yangtze River and Ganges River in the south of Qinghai-Xizang Plateau, the radial pattern in Huaihe Haihe River drainage basin appearing in the alluvial fan region of Yellow River's downstream and the anastomotic pattern does in the delta of Yangtze River, in the northern coastal plain of the Jiangsu-Province and in the delta of Zhujiang River. Except these areas in the peripheral drainage basin, the dendritic pattern is usually found in the other areas.

• Journal of the Institute of Electronics Engineers of Korea CI
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• v.38 no.4
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• pp.10-21
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• 2001

This paper develops a logical simulation method for by dyversity of situations. Most existing systems, for example, games and infant tutoring systems lead users to virtual environment with unfolding situations, but are not designed to induce the change of the environment itself. In this paper, a logically simulated environment is created by defining situations and single events based on situation hierarchy structure. We elaborate the occurrence of events by classifying the causality. The occurrence or natural phenomena is dictated by physical laws and natural phenomena are expressed as the transition of the event based on event association. Specifically we define the source of the event for natural phenomena and we consider the existence of objects as a primary factor in event occurrence. The advantages of this approach include the reuse of events, that is, different events can be generated in the same flow with fresh conditions. This allows us to implement a more practical and logical environment. A drawback to this method is the difficulty in dividing a situation into events. The proposed method was implemented in the context of the change of season among natural phenomena.

• Journal of The Geomorphological Association of Korea
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• v.19 no.4
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• pp.139-155
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• 2012

Most of previous landform classification methods using DEM compares the values between the center of the cell and the surrounding cells, which in turn, greatly depends on analysis scale. To overcome the problem of scale-dependency, a new classification scheme is developed, which is called "Geomorphons". Unlike the traditional approaches using DEM, Geomorphons is the way which compares the level with other cells against the criteria cell. As a pilot study, we classify the landforms of Pyeongchang-Gun in Korea. Then, we compare the result with the other methods such as Topographic Position Index. Through the systematic analysis, we obtain the following findings. First, Geomorphons can reduce the time for the classification of landforms because of using unsupervised classification. Second, Geomorphons is little dependent on change in the scale, which can provide a pilot tool for reconnaissance study for covering large area.

• Journal of the Korea Society of Computer and Information
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• v.9 no.3
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• pp.87-93
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• 2004

In this paper we present a hybrid model that enables dynamic regrouping based on emotion in determining the behavioral pattern of crowds in order to enhance the reality of crowd simulation in virtual environments such as games. Emotion determination rules are defined and they are used for dynamic human regrouping to simulate the movement of characters through crowds realistically. Our experiments show more natural simulation of crowd behaviors as results of this research.

• Proceedings of the Korean Information Science Society Conference
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• 2001.04b
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• pp.409-411
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• 2001

인터넷 사이트의 정보량이 증가함에 따라 사용자에게 필요한 정보를 검색할 수 있는 도구를제공해야 할 필요성이 증대되고 있다. 아직까지는 대부분의 사이트에서 키워드에 기반한 단순한 검색기법을 주로 사용하는데, 이 방식은 사용자의 의도를 제대로 표현하기 어렵기 때문에 검색결과가 지나치게 많거나 의도하지 않은 결과를 얻기 쉽고, 사용자가 자연스럽게 정보를 검색할 수 없는 문제가 있다. 이 논문에서는 자연어를 통하여 사용자에게 보다 정확하고 친절하게 적절한 정보를 제공해주는 대화형 에이전트를 제안한다. 이 시스템은 기존의 자연어처리 기법의 한계를 극복하기 위하여 질의-답변간의 융통성 있는 패턴매칭 기법을 사용하며, 효과적인 매칭을 위하여 포섭구조에 기반한 질의분류를 선행하는 구조적 패턴매칭 방식 사용한다. 간단한 웹 페이지를 소개하는 문제에 적용한 결과, 그 가능성 및 개선점을 파악할 수 있었다.