텍스트 마이닝을 통한 국내 미세플라스틱에 대한 비정형 데이터의 정보화

정우성,김정진,정한석 대한환경공학회 2023 대한환경공학회지 Vol.45 No.1

Objectives: In this study, we seek to provide a thorough insight into how people perceive them and uncover issues and hidden trends about the significant microplastic pollution problems by analyzing unstructured data on microplastics. Methods: Environmental news articles related to microplastics were collected. Text mining techniques including data pre-processing, word cloud, TF-IDF weight-based trend analysis, and topic modeling were used to analyze the amount of textual data. Results and Discussion: The public's interest in microplastics is consistently growing, according to an analysis of all environmental news and the keyword ‘microplastic’ from 2014 to 2021 conducted via BIGKinds. The keyword 'trash' was the overwhelmingly enormous weight among words. The top 5 keywords connected to microplastics did not fade away and continued appearing even though the socially noticeable keywords during the study period varied yearly. This indicates that the primary issue with microplastics related to keywords has not yet been solved. Our study has a limitation of subject diversity because we only focused on microplastic news. The results indicated that all processes from plastic pollution emergence to treatment, such as microplastic pollution sources, microplastic detection, and prevention methods against microplastics. Conclusions: Text mining analysis was performed on microplastics in environmental news. This study is meaningful in that it presents a new methodology for environmental and social problem analysis, and can be used as basic data for environmental policy establishment and problem-solving using unstructured big data. 목적: 미세플라스틱에 대한 비정형 데이터 분석을 통해 미세플라스틱 오염 문제에 대한 쟁점과 숨겨진 경향을 정보화함으로써 미세플라스틱에 대한 보다 입체적 이해를 돕고자 한다. 방법: 미세플라스틱에 대한 비정형 텍스트 데이터인 뉴스 기사를 수집하고, 데이터 전처리, 워드 클라우드, TF-IDF 가중치 기반 트렌드 분석 및 토픽모델링 등의 텍스트 마이닝 기법을 이용한다. 결과 및 토의: 빅카인즈를 통해 2014-2021년 간의 환경 전체 뉴스와 미세플라스틱 키워드 분석 결과 미세플라스틱에 관한 대중들의 관심이 지속적으로 상승하고 있는 것으로 나타났다. 단어들 중 압도적으로 큰 가중치를 나타낸 키워드는 ‘쓰레기’였다. 연구 기간 동안 사회적으로 주목하는 키워드는 매년 변화해 왔음에도 불구하고 미세플라스틱과 관련된 상위 5개의 키워드는 사라지지 않고 꾸준히 출현했다. 이는 키워드와 관련된 미세플라스틱에 대한 주요 문제점을 해소하지 못했음을 의미한다. 검색어를 ‘미세플라스틱’으로 한정하여 주제의 다양성에는 한계가 있으나, 미세플라스틱 오염원, 미세플라스틱 검출, 미세플라스틱에 대한 대책 등 플라스틱 오염 발생부터 처리까지의 일련의 과정들을 모두 다루고 있음을 확인했다. 결론: 환경뉴스에서 미세플라스틱 대한 텍스트 마이닝 분석을 수행하였다. 본 연구를 통해 환경사회적 문제에 대해 전통적인 환경분석 방법과는 다른 접근법이 사용 가능함을 보였다. 이는 향후 환경분야 관련 연구에 새로운 방법론을 제시했다는 점에서 의의가 있다.

피아노 코드 연습 데이터를 활용한 맞춤형 학습 지원

정우성,이은주,최수아 한국인터넷방송통신학회 2023 한국인터넷방송통신학회 논문지 Vol.23 No.1

IT기술을 교육 서비스에 접목시키는 에듀테크 시대가 도래함에 따라, 음악 교육에서도 다양한 시도들이 행해지고있다. 교수자 중심에서 학습자 중심으로 옮아가면서 학습자 맞춤형 학습에 대해 관심이 높아졌으며, 이를 위해서 학습자의 숙련도를 파악하는 것이 필요하다. 피아노 학습에서 코드 운지법은 반주자가 필수적으로 익혀야 할 기법이다. 본 논문에서는 맞춤형 코드 운지법 학습 도구를 제안하고 코드 운지법 패턴 분석을 통한 활용 방안을 보였다. 구체적으로는, 학습자의 축적된 코드 연습 데이터를 활용하여 코드의 난이도나 학습자의 숙련도를 파악하고, 코드 사이의 유사도에 기반한 계층적 클러스터링을 수행하여 코드 클러스터들을 통하여 보다 향상된 코드 연습에 대한 활용방안을 제시하였다. 본 연구의 의의는 연습 데이터로부터 의미 있는 정보를 획득하여 맞춤형으로 코드 학습을 할 수 있다는 데 있다. 또한테스트와 같은 부가적인 노력 없이, 연습 시에 저장되는 데이터들을 이용하여 숙련도와 코드 학습 난이도가 산정되므로학습자 입장에서의 부담을 경감시킬 수 있다.

마산만 수질관리를 위한 오염원 영향 예측

정우성,이원찬,홍석진,김형철,김정배,김진호,김동명 해양환경안전학회 2015 해양환경안전학회 학술발표대회 논문집 Vol.2015 No.11

복분자딸기 탄저병균의 병원성과 기주범위

정우성,김주희,이기권,정성수,이왕휴 한국식물병리학회 2013 식물병연구 Vol.19 No.2

사과, 호박, 고추에서 분리된 탄저병균들(Colletotrichumgloeosporioides, C. orbiculare, C. acutatum)이 복분자딸기에 병원성을 나타냈으며. 특히 사과에서 분리된 탄저병균은 무상처 접종에서도 병원성을 나타냈다. 복분자 딸기에서 분리한 탄저병균(Colletotrichum gloeosporioides,C. coccodes, C. acutatum)은 사과와 딸기에서는 dropping접종에 의해 병원성을 보였으나 고추와 토마토에서는 낮은 병원성을 나타내었다. The strains of Colletotrichum gloeosporioides, C. coccodes, C. acutatum isolated from black raspberry were pathogenic to apple and strawberry after dropping inoculation, but showed weak pathogenicity in hot-pepper and tomato. The anthracnose pathogens of C. gloeosporioides, C. orbiculare, C. acutatum isolated from apple,hot-pepper and pumpkin showed pathogenicity in black raspberry. Moreover, the anthracnose pathogens isolated from apple caused disease symptoms in non-wounded inoculation.

육상오염 부하량에 따른 수영강 하구해역 수질 응답특성

정우성,홍석진,이원찬,김형철,김진호,박정현,오효정,김동명 해양환경안전학회 2017 해양환경안전학회 학술발표대회 논문집 Vol.2017 No.11

세법복잡성과 학습자의 개별적 특성

정우성 부산 외국어 대학교 2003 外大論叢 Vol.26 No.-

This study examined the importance of student characteristics in explaining the level of complexity on the korean individual income tax law. Complexity measures employed in prior research are reviewed and evaluated. and evaluated. previous studies have defined tax complexity in a variety of ways and have different approaches. This study tests a measurement of tax law complexity, which is based on the knowledge of at P university in 2001 sophomore. In addition, the importance of various complexity factors is explored. One of objectives of the study was to determine whether ranked complexity factors were associated line items that assigned high complexity scores. To test whether differences in the values assigned five factors were statistically significant or simply due to chance variation, a Friedman rank sum test was performed. In general, there was agreement that too much calculations was the most important causes of complexity and most of student feel very difficult and complex calculation of basic assessment and individual income tax law. And performance of subjects in university, learning experience about tax law, major in accounting, willingness to prepare national examination are significant in explaining the level of complexity. Major in accounting, however, is not significant factors. I believe that this results provide some interesting insights concerning the possible effects of the tax authority and other possible policy actions on tax simplification. In addition, the results of this paper give some help to professor and student in the university that how can I teach and study the complex individual income tax law more simply and comfortably.

EML-PVD를 이용한 고속 Zn 코팅

정우성,남경훈,엄문종,김태엽 한국표면공학회 2012 한국표면공학회 학술발표회 초록집 Vol.2012 No.5

자기주식의 취득과 기업특성

정우성 釜山外國語大學校 2005 外大論叢 Vol.30 No.-

This study empirically examines specific characteristics of firm that repurchased common stock. The sample consists of 258 listed firm include 89 treasury stock purchase firms and 169 non-purchase firms(control group). Selected firm characteristics are pay ratio, earning per share, book value per share, current ratio, leverage ratio, and price-earnings ratio. The result indicated that treasury stock purchase is positively related to four firm characteristics(PAY, EPS, LEV, PER) by univariate analysis(t-test and Wilcoxon test) and multivariate logit analysis. As the case of any study, this study has several limitations. But this paper is basic empirical research related with common stock repurchase and will be support for further studies.

商業計算敎育의 效率性 提高方案에 관한 硏究 : 商業界 高等學校를 중심으로

鄭宇城 釜山 外國語 大學校 1999 外大論叢 Vol.19 No.4

The purpose of this paper is to find to improve the quality of education of commercial calculation at commercial high schools after researching the problems of present education of commercial calculation. For this study, through the literature review and questionnaire, the major problems affecting the effectiveness and effecting of commercial calculation education are as follows, First, the classes of commercial calculation in the curriculum of commercial high school are decreasing. Secondly, the chapter of `calculation using an abacus` is outdated and the interesting of students are rapidly decreasing. And on the chapter of `calculations a calculator`, the practicing calculation using a calculator is not enough to become an expert in the firm. On the third, because the class is focused on passing a national certificate of qualification, the curriculum is sometimes neglected. Fourth, the old fashioned four arithmetic operations had been used and caused the lack of practical commercial calculation. The way to correct the above problems and improve the present curriculums are as follow; First of all, considering the specially of the curriculum of commercial calculation, time about it should be increased and divided properly. Secondly, the curricula must be revised to practice the excellent function of an abacus and the diverse function of a calculator. On the third, being faithful to curricula should be granted much more important than winning a national certificate of qualification. For this teachers should prepare their classes very well. Lastly, the system of national certificate of qualification should be revised so that the students can have interests and their calculation ability can be elevated. When these solutions are effectively performed, it is expected that the goals of commercial calculation should be achieved.

재무분석가 이익예측오차의 유형에 관한 연구

정우성 釜山外國語大學校 2005 外大論叢 Vol.31 No.-

This study has empirical tests for the accuracy of financial analysts' forecasts and the decomposition of forecast errors. The final sample consists of 1,555 listed firm forecasted years over the eight years of 1985 to 2002 by Daewoo Economic Research Institute. The accuracy of forecasts is evaluated by the mean forecast errors, mean absolute forecast errors and Theil's inequality coefficient. The results show that the accuracy of financial analysts' forecasts are low level and as if uses the martingale model in forecasting before the beginning of the fiscal year. The decomposition of mean square errors into three patterns of bias, regression and random show that most of the forecast errors of analysts' forecasts are attributable to the random factors.