• KIPS Transactions on Computer and Communication Systems
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• v.5 no.9
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• pp.229-236
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• 2016

In the past, crime prediction methods utilized previous records to accurately predict crime occurrences. Yet these crime prediction models had difficulty in updating immense data. To enhance the crime prediction methods, some approaches used social network service (SNS) data in crime prediction studies, but the relationship between SNS data and crime records has not been studied thoroughly. Hence, in this paper, we analyze the relationship between SNS data and criminal occurrences in the perspective of crime prediction. Using Latent Dirichlet Allocation (LDA), we extract tweets that included any words regarding criminal occurrences and analyze the changes in tweet frequency according to the crime records. We then calculate the number of tweets including crime related words and investigate accordingly depending on crime occurrences. Our experimental results demonstrate that there is a difference in crime related tweet occurrences when criminal activity occurs. Moreover, our results show that SNS data analysis will be helpful in crime prediction model as there are certain patterns in tweet occurrences before and after the crime.

• Korean Journal of Cognitive Science
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• v.25 no.4
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• pp.385-416
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• 2014

In this study, memory for emotional words was compared between extraverts and introverts, employing signal detection analysis to distinguish differences in discriminative memory and response bias. Subjects were presented with a study list of emotional words in an encoding session, followed by a recognition session. Effects of task difficulty were examined by varying the nature of the encoding task and the intervals between study and test. For an easy task, with a retention interval of 5 minutes (Study I), introverts exhibited better memory (i.e., higher d') than extraverts, particularly for low-frequency words, and response biases did not differ between these two groups. For a difficult task, with a one-month retention period (Study II), performance was poor overall, and only high-frequency words were remembered; also extraverts adopted a more liberal criterion for 'old' responses (i.e., more hits and more false alarms) for positive emotional-valence words. These results suggest that as task difficulty drives down performance, effects of internal control processes become more apparent, revealing differences in response biases for positive words between extraverts and introverts. These results show that extraversion can distort memory performance for words, depending on their emotional valence.

• The Journal of the Korea Contents Association
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• v.22 no.5
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• pp.1-15
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• 2022

In this study, text analysis was performed on the mealkit product review data to identify factors affecting the evaluation of the mealkit product. The data used for the analysis were collected by scraping 334,498 reviews of mealkit products in Naver shopping site. After preprocessing the text data, wordclouds and sentiment analyses based on word frequency and normalized TF-IDF were performed. Logistic regression model was applied to predict the polarity of reviews on mealkit products. From the logistic regression models derived for each product category, the main factors that caused positive and negative emotions were identified. As a result, it was verified that text analysis can be a useful tool that provides a basis for maximizing positive factors for a specific category, menu, and material and removing negative risk factors when developing a mealkit product.

• Korean Journal of Cognitive Science
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• v.32 no.3
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• pp.99-115
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• 2021

Unlike most other alphabetic languages, letter transposition effect was not found in Korean except in the syllable level and in the morpheme level. This study was conducted in order to investigate the possible reason of the absence of letter transposition effect in Korean. Based on previous letter transposition studies, this study was to investigate on whether syllable frequency is a moderating variable and is responsible for the absence of the letter transposition effect. The results showed that significant letter transposition effect was found when a transposed non-word has high frequency syllable(e.g., 민주화 → 진무화), while such effect was not seen in a transposed non-word with low frequency syllable. The results showed that the letter transposition effect can found in Korean as well. The results also implicate the possibility that syllable frequency is the main moderating variable regarding the Korean letter transposition effect.

• The Journal of the Institute of Internet, Broadcasting and Communication
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• v.12 no.5
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• pp.243-253
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• 2012

An opinion mining technique which was developed from document classification in area of data mining now becomes a common interest in domestic as well as international industries. The core of opinion mining is to decide precisely whether an opinion document is a positive or negative one. Although many related approaches have been previously proposed, a classification accuracy was not satisfiable enough to applying them in practical applications. A opinion documents written in Korean are not easy to determine a polarity automatically because they often include various and ungrammatical words in expressing subjective opinions. Proposed in this paper is a new approach of classification of opinion documents, which considers only a frequency of word patterns and excludes the grammatical factors as much as possible. In proposed method, we express a document into a bag of words and then apply a learning algorithm using a frequency of word patterns, and finally decide the polarity of the document using a score function. Additionally, we also present the experiment results for evaluating the accuracy of the proposed method.

• KIPS Transactions on Software and Data Engineering
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• v.8 no.3
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• pp.109-114
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• 2019

The similarity detecting method that is basically used in most plagiarism detecting systems is to use the frequency of shared words based on morphological analysis. However, this method has limitations on detecting accurate degree of similarity, especially when similar words concerning the same topics are used, sentences are partially separately excerpted, or postpositions and endings of words are similar. In order to overcome this problem, we have designed and implemented a plagiarism detecting system that provides more reliable similarity information by measuring sentence similarity and syntactic word similarity in addition to the conventional word similarity. We have carried out a comparison of on our system with a conventional system using only word similarity. The comparative experiment has shown that our system can detect plagiarized document that the conventional system can detect or cannot.

• Journal of the Korea Society of Computer and Information
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• v.27 no.12
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• pp.111-119
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• 2022

The purpose of this paper is to examine the change in perception of 3D virtual fashion before and after COVID-19 using big data analysis. The data collection period is from January 1, 2017, before the outbreak of COVID-19, to October 30, 2022, after the outbreak. Big data was collected for key words related to 3D virtual fashion extracted from social media such as Naver, Daum, Google, and YouTube using Textom. After the collected words were refined, word cloud, word frequency, connection centrality, network visualization, and CONCOR analysis were performed. As a result of extracting and analyzing 32,461 words with 3D virtual fashion as a keyword, the frequency and centrality of fashion, virtual, and technology appeared the highest, and the frequency of appearance of digital, design, clothing, utilization, and manufacturing was also high. Through this, it was found that 3D virtual fashion is being used throughout the industry along with the development of technology. In particular, the key words that stand out the most after COVID-19 are metaverse and 3D education, which are in high demand in the fashion industry.

• The Transactions of the Korea Information Processing Society
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• v.5 no.7
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• pp.1774-1782
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• 1998

한 언어에서 사용된느 단어의 총 개수를 추정하는 것은 매우 어려운 작업이다. 최근 한 언어를 대표하는 것으로 생각되는 원문, 발화, 또는 기타 표본들의 뭉치인 말뭉치가 대규모로 구축됨으로 말뭉치를 기반으로 하여 한 언어의 총 단어 개수를 추정할 수 있게 되었다. 본 논문에서는 한국어 말뭉치에 나타난 단얼르 기반으로한국어 단어의 총 개수를 추정하는 방법을 제시하고 한국어 단어의 총 개수를 추정한다. 이와 더불어 한국어에서 가장 많은 수의 고유명사를 차지하는 한국사람 이름의 총 개수도 함께 추정한다. 단어 개수와 이름 개수의 추정방법은 빈도를 이용한 일반화된 선형모형을 적용하였다. 1000만 어절의 말뭉치를 이용하여 한국어의 총 단어를 추정한 결과 1,062,392개로 추정되었으며 한국사람 이름의 개수는 1,493,003개로 추정되었다.

• Proceedings of the Korean Information Science Society Conference
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• 1998.10b
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• pp.339-341
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• 1998

다양한 정보교환 수단의 하나인 유즈넷은 방대한 정보량을 가진다. 사용자는 유즈넷에서 필요한 정보를 쉽게 찾지 못하므로 뉴스그룹 전체와 본문에서 정보 검색의 필요성을 인식하고 있다. 이 논문에서는 정보검색시스템을 유즈넷으로 확장시 단어 가중치 적용방법의 개선을 통해 검색효율을 향상시키고자 한다. 정보검색에서 단어의 중요도에 영향을 미치는 tf, idf 이외의 다른 요소인 카테고리빈도(category frequency, cf)를 활용하여 tf*idf방법에 역카테고리빈도(inverted categoary frequency, icf)를 고려한 유사도 계산 방법을 제시하고 이를 검증하였다. 실험 결과에서 상위 30위 내의 평균 적합문서의 수가 tf*{{{{ SQRT {idf$^2$+icf$^2$} }}}}방법이 tf*idf 방법보다 4.6% 향상됨을 알 수 있다.

• Proceedings of the Korea Information Processing Society Conference
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• 2018.10a
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• pp.755-758
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• 2018

현재의 정보 검색 및 문서를 분류하는 기법에 대하여 신경망을 이용한 정보검색 모델에 대한 연구가 활발히 진행되고 있으며, 간단한 문장에 대한 주제어 분석에서부터 장문에 해당하는 수필 등의 문서를 분류하는 기술이 요구되고 있으며, 이를 실현하기 위한 다양한 알고리즘을 적용하거나, 단어 및 문서에 가중치를 적용하거나, 문서에서의 특이 값을 구하고, 이를 분석하는 방법에 대하여 정보화가 가속화 되면서 정확한 문서에 대한 이해가 요구되고 있다. 이러한 연구와 직접적으로 관련된 단어의 빈도에 대한 논의는 사회과학의 영어학습에 대한 연구 또는 순수 언어에 대한 연구에 머물러 있다. 이에 본 연구에서는 영문에서의 응집장치를 이용하여 문장에서의 중요 단어에 대한 빈도를 합리적으로 증가시켜 문장의 의미를 더 정확하게 분석할 수 있는 기법에 대하여 제시하고자 하며, 본 논문에서는 영문 수필 사이트의 분류를 추측하고 이를 자동 분류 할 수 있는 방법에 대하여 제시하고자 하며, 이를 구현하여 문서의 의미에 대한 연구에 기여하고자 한다.