• Proceedings of the Korean Information Science Society Conference
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• 2001.04a
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• pp.508-510
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• 2001

동영상을 효율적으로 압축하기 위한 움직임백터 예측에 관한 많은 연구가 진행되어 왔다. 가장 일반적인 FBMA(Full search-based Block Matching Algorithm)는 화질은 좋지만 계량이 많기 때문에 실시간 인코딩을 요구하는 시스템에서 사용하는데 문제가 있다. 좋은 화질을 유지하면서 인코딩 속도를 해결하기 위한 많은 알고리즘들이 제안되어 왔지만 ASIC이나 소형 시스템에서 사용할 수 있는 방법이 계속 요구되고 있다. 본 논문에서는 계산량을 더욱 줄여 속도향상을 위한 방법인 TSWS(Two-Step search With Subsampling method) 제안하였다. TSWS는 블록정합알고리즘에 기반을 두고 있으며, 서브샘플링한 값으로 움직임 벡터를 찾는다. TSWS를 사용하였을 때 기존 방법들이 제공하는 주관적 화질이나 PSNR을 어느 정도 유지하면서도 속도를 20-30% 정도 개선시킬 수 있다.

• The Korean Journal of Financial Studies
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• v.6 no.1
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• pp.171-192
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• 2000

본 논문은 한국에서 상장기업의 주가와 주당순이익의 관계에 대한 계량분석이다. 특히, 주가나 주당순이익이 모두 비안정적 자료임에 착안하였고, 최근 개발되어 발전하고 있는 '패널자료에서의 단위근검정 및 공적분검정' 방법을 이용하였다. 분석결과, 주가 및 주당순이익은 모두 단위근을 갖고 있었으며, 주가수익비율인 PER도 개별단위근 검정에서는 단위근을 갖는 것으로 나왔다. 또한, 개별기업 차원에서는 주가와 주당순이익 사이에도 공적분관계가 없는 것으로 나타났다. 하지만, 패널 단위근방법을 이용하여 검정하였을 때는 PER이 안정적인 것으로 나타났으며, 패널공적분방법을 이용했을 때는 주가와 EPS사이에도 공적분관계가 있다는 결과를 얻었다. 이는, 우리나라의 주식시장에서도, 최소한 기업 전체적으로는, 주가가 주당순이익을 반영한다는 것을 의미한다. 본 논문에서는, PER이 어떤 일정한 수준으로부터 벗어나는 경우, 그 괴리가 반으로 줄어드는 데는 전체기업 평균적으로 볼 때 4개월$\sim$16개월 정도 걸리는 결과를 얻었다.

• Journal of the Korean Geographical Society
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• v.42 no.4
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• pp.632-647
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• 2007

Lots of geographic phenomena have dynamic spatial patterns with time changes, and there have been lots of researches on exploring these dynamic spatial patterns. However, most of these researches focused on the static pattern analysis in a given period, rather than dealing with dynamic changes in the spatial pattern over time with the continual or cumulative perspective. For this reason, investigation of the inertia of spatial process in terms of temporal changes is needed. From this background, the purpose of this paper is to propose the methodology to explore the changes in spatial pattern cumulatively by considering the inertia of the spatial statistics over time, and to apply it to the case study That is, we introduce the new spatial statistic, and produce the z-values of the statistic using Monte Carlo Simulation, and then to explore the changes in spatial patterns over time cumulatively. To do this, the method to combine the J statistic with CUSUM statistic for exploring spatial patterns, and to apply it to the changes in the commercial landuse in Erie County, New York State. Through the proposed method for spatio-temporal Patterns, we could explore continual changes effectively in the spatial patterns reflecting the statistics by temporal spot cumulatively.

• Korean Journal of Cognitive Science
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• v.17 no.4
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• pp.255-269
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• 2006

The purpose of this study is to analyze newspaper articles from corpus linguistic point of view. We used a large corpus of newspaper articles built from <21st century Sejong Project> and counted occurrences of certain expressions. A newspaper article is divided into the headline, the lead and the body. We tried to figure out how to measure the characteristics of indication and compression which are typical to headlines. Then, we focused on the differences between the headline and the lead. finally, we analyzed the sentence structure and measured the ratio of the frequency of common nouns in the body. This study verifies the existing stylistic theories of newspapers and shows new aspects of language use in newspaper articles. Texts like newspaper articles are the results of human language processing and they in turn affect the development of cognitive ability of language.

• Journal of the Korean Society for Library and Information Science
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• v.53 no.3
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• pp.247-271
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• 2019

Uncertainty in scientific knowledge means an uncertain state where propositions are neither true or false at present. The existing studies have analyzed the propositions written in the academic literature, and have conducted the performance evaluation based on the rule based and machine learning based approaches by using the corpus. Although they recognized that the importance of word construction, there are insufficient attempts to expand the word by analyzing the meaning of uncertainty words. On the other hand, studies for analyzing the structure of networks by using bibliometrics and text mining techniques are widely used as methods for understanding intellectual structure and relationship in various disciplines. Therefore, in this study, semantic relations were analyzed by applying Word2Vec to existing uncertainty words. In addition, WordNet, which is an English vocabulary database and thesaurus, was applied to perform a network analysis based on hypernyms, hyponyms, and synonyms relations linked to uncertainty words. The semantic and lexical relationships of uncertainty words were structurally identified. As a result, we identified the possibility of automatically expanding uncertainty words.

• International Area Studies Review
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• v.13 no.1
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• pp.265-286
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• 2009

The purpose of this research can be said as follows. The close examination of competitive advantages of Korean enterprises who have been participating and dominating the management activities directly in India. And the Analysing of the correlation between the competitive advantages and the management performances of Korean firms there. That is, the factors which exercise their influence over the local management positively can be activated and developed reasonably and systematically while the others which exercise their influence over it negatively have to be eliminated, at least. The factors of competitive advantages on this paper are from ones which could generally be recognized on the basis of the preceding studies, and the management performances are divided by three sub-variables like sales, profits and management satisfaction. As empirically statistical method, Regression coefficient analysis as inferential statistics as well as Pearson's correlation as descriptive is implemented for this paper of testing some hypotheses.

• Journal of the Korean Society for information Management
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• v.40 no.4
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• pp.375-401
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• 2023

A school library is where students develop their skills to cope with future uncertainty and can utilize various information materials to build their capability and response abilities to changes. Teachers' perception is crucial as their guidance is essential for the student to use the school library. Most studies, however, focused on quantitative measurement of the importance of the teachers' perception as an external environment, and there is a lack of specific categorization of different types of perceptions on the role of the school library. This study aims to examine types of perceptions about the school library among elementary school teachers. To do so, this study used Latent Profile Analysis (LPA), a person-centered approach, to identify teachers' complex perceptions about the role and importance of the school library, which were difficult to review in previous studies, and the teachers' most representative types of perceptions. Based on the findings from the above, this study is meaningful in proposing customized measures to operate and promote the school library depending on teachers' perceptions.

• Proceedings of the Korea Contents Association Conference
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• 2006.11a
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• pp.667-671
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• 2006

Co-Authorship analysis is a kind of bibliometric analysis. and a well established tool for character of knowledge network in some technical fields. If more than two authors co-author an article, there is a relation of knowledge. So This study aims at discovering the trends and phases of OLED technology using co-authorship analysis, a kind of bibliographic analysis. The Science Citation Index Expanded(SCIE) database was used to search for the number of times paired Korean articles were co-authored in OLED field.

• International Area Studies Review
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• v.13 no.2
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• pp.475-504
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• 2009

The purpose of this thesis is to analyze and investigate why and how these 4 factors (the images of country of origin, imported luxury brand, objective products' characteristics and Projective consumer's peculiarity) impact product preferences & purchasing intention of consumers who plan to buy "Imported Luxury Branded goods". For this study the research directions are: 1. To find each impact of Country of Origin and Brand image which influence "the preference of imported luxury brand items". 2. To analyze the difference of "the effects of Country or Origin" which impacts product preference when consumers buy imported luxury branded goods, which have different purchasing risks. 3. To verify the difference of products' characteristics that have different purchasing risks through comparing the image of country of origin and brand. 4. To analyze and compare "the purchasing behavior of Korean consumers" for achieving research universality. In order to verify that those 4 factors (the images of country of origin, imported luxury brand, objective products' characteristics and prospective consumer's peculiarity) impact on product preferences & purchasing intention of consumers, the linear structural equation model was developed. According to this research model, 9 hypotheses were designed.

• Spatial Information Research
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• v.20 no.1
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• pp.81-90
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• 2012

When analyzing geographical phenomena, two properties need to be considered. One is the spatial dependence structure and the other is a variation or an uncertainty inhibited in a geographic space. Two problems are encountered due to the properties. Firstly, spatial dependence structure, which is conceptualized as spatial autocorrelation, generates heterogeneous geographic landscape in a spatial process. Secondly, generic statistics, although suitable for dealing with stochastic uncertainty, tacitly ignores location information im plicit in spatial data. GIS is a versatile tool for manipulating locational information, while spatial statistics are suitable for investigating spatial uncertainty. Therefore, integrating spatial statistics to GIS is considered as a plausible strategy for appropriately understanding geographic phenomena of interest. Geographic hot-spot analysis is a key tool for identifying abnormal locations in many domains (e.g., criminology, epidemiology, etc.) and is one of the most prominent applications by utilizing the integration strategy. The article aims at reviewing spatial statistical perspective for analyzing spatial processes in the framework of GIS by carrying out empirical analysis. Illustrated is the analysis procedure of using spatial scan statistic for detecting clusters in the framework of GIS. The empirical analysis targets for identifying spatial clusters of breast cancer incidents in Erie and Niagara counties, New York.