• KSII Transactions on Internet and Information Systems (TIIS)
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• 제17권11호
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• pp.2966-2986
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• 2023

Climate change is a constant threat to human life, and it is important to understand the public perception of this issue. Previous studies examining climate change have been based on limited survey data. In this study, the authors used big data such as news articles and social media data, within which the authors selected specific keywords related to climate change. Using these natural language data, topic modeling was performed for discourse analysis regarding climate change based on various topics. In addition, before applying topic modeling, sentiment analysis was adjusted to discover the differences between discourses on climate change. Through this approach, discourses of positive and negative tendencies were classified. As a result, it was possible to identify the tendency of each document by extracting key words for the classified discourse. This study aims to prove that topic modeling is a useful methodology for exploring discourse on platforms with big data. Moreover, the reliability of the study was increased by performing topic modeling in consideration of objective indicators (i.e., coherence score, perplexity). Theoretically, based on the social amplification of risk framework (SARF), this study demonstrates that the diffusion of the agenda of climate change in public news media leads to personal anxiety and fear on social media.

• 지능정보연구
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• 제28권1호
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• pp.131-154
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• 2022

최근 방대한 양의 텍스트 데이터에 대한 분석을 통해 유용한 지식을 창출하는 시도가 꾸준히 증가하고 있으며, 특히 토픽 모델링(Topic Modeling)을 통해 다양한 분야의 여러 이슈를 발견하기 위한 연구가 활발히 이루어지고 있다. 초기의 토픽 모델링은 토픽의 발견 자체에 초점을 두었지만, 점차 시기의 변화에 따른 토픽의 변화를 고찰하는 방향으로 연구의 흐름이 진화하고 있다. 특히 토픽 자체의 내용, 즉 토픽을 구성하는 키워드의 변화를 수용한 다이내믹 토픽 모델링(Dynamic Topic Modeling)에 대한 관심이 높아지고 있지만, 다이내믹 토픽 모델링은 분석 결과의 직관적인 이해가 어렵고 키워드의 변화가 토픽의 의미에 미치는 영향을 나타내지 못한다는 한계를 갖는다. 본 논문에서는 이러한 한계를 극복하기 위해 다이내믹 토픽 모델링과 워드 임베딩(Word Embedding)을 활용하여 토픽의 변화 및 토픽 간 관계를 직관적으로 해석할 수 있는 방안을 제시한다. 구체적으로 본 연구에서는 다이내믹 토픽 모델링 결과로부터 각 시기별 토픽의 상위 키워드와 해당 키워드의 토픽 가중치를 도출하여 정규화하고, 사전 학습된 워드 임베딩 모델을 활용하여 각 토픽 키워드의 벡터를 추출한 후 각 토픽에 대해 키워드 벡터의 가중합을 산출하여 각 토픽의 의미를 벡터로 나타낸다. 또한 이렇게 도출된 각 토픽의 의미 벡터를 2차원 평면에 시각화하여 토픽의 변화 양상 및 토픽 간 관계를 표현하고 해석한다. 제안 방법론의 실무 적용 가능성을 평가하기 위해 DBpia에 2016년부터 2021년까지 공개된 논문 중 '인공지능' 관련 논문 1,847건에 대한 실험을 수행하였으며, 실험 결과 제안 방법론을 통해 다양한 토픽이 시간의 흐름에 따라 변화하는 양상을 직관적으로 파악할 수 있음을 확인하였다.

• 보건교육건강증진학회지
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• 제27권2호
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• pp.79-93
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• 2010

Objectives: This study aims to identify the factors associated with the stages of change in colorectal cancer screening, and develop a model explaining these stages of change by using structural equation modeling analysis. Methods: On the basis of literature review and expert advice, we constructed our hypothetical model that consisted of five theoretical constructs(process of change, pros, cons, self-efficacy, stage of change). In 2009, data was collected from 486 participants aged between 50 and 69. The data were analyzed by SPSS 15.0 and AMOS 6.0. Results: In the case of stage of adoption, the contemplation stage was the most common (37.4%), followed by the action stage (26.5%). In the final model of the stage of change for colorectal cancer screening, there was a direct influence of the process of change ($\gamma$=.562, p<.001), and cons ($\gamma$=.132, p<.01) on the stage of change with the terms of GFI .931, AGFI .904, RMR .038, NFI .930, and NNFI .936. Conclusion: It is necessary to produce and disseminate evidence-based cancer screening information, which can mitigate the negative attitude among the public toward cancer screening. Also, it is essential to provide a safer and more comfortable environment at cancer screening center.

• 한국CDE학회논문집
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• 제19권2호
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• pp.103-110
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• 2014

Engineering changes are indispensable engineering and management activities for manufactures to develop competitive products and to maintain consistency of its product data. Analysis of engineering changes provides a core functionality to support decision makings for engineering change management. This study aims to develop a method for analysis of engineering changes based on On-Line Analytical Processing (OLAP), a proven database analysis technology that has been applied to various business areas. This approach automates data processing for engineering change analysis from product databases that follow an international standard for product data management (PDM), and enables analysts to analyze various aspects of engineering changes with its OLAP operations. The study consists of modeling a standard PDM database and a multidimensional data model for engineering change analysis, implementing the standard and multidimensional models with PDM and data cube systems and applying the implemented data cube to core functions of engineering change management, the evaluation and propagation of engineering changes.

• Human Ecology Research
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• 제55권3호
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• pp.263-274
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• 2017

The purposes of this study were to verify the longitudinal mediating effects of work-family balance on the relationship of role recognition in the family, marital intimacy and job satisfaction of married women, and to introduce longitudinal mediating effects by using latent growth curve modeling and autoregressive cross-lagged modeling. The subjects were married women from the third year data of the Korean Longitudinal Survey of Women and Family. Structural equational models were conducted with Amos ver. 21.0. The major findings are as follows. First, the result of the longitudinal mediating effects of latent growth modeling is the rate of change of work-family balance mediated between the rate of change of role recognition in the family and the rate of change of job satisfaction, and the rate of change of work-family balance mediated between the rate of change of marital intimacy and the rate of change of job satisfaction. Second, when using the autoregressive cross-lagged modeling, the more role recognition and marital intimacy of third year were the more work-family balance of fourth year, job satisfaction of fifth year. In both models, work-family balance mediated between role recognition in the family, marital intimacy and job satisfaction. Therefore, through this study, mediating effects of work-family balance can be found that there was a longitudinal effects.

• 한국환경복원기술학회지
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• 제27권3호
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• pp.29-43
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• 2024

Legally protected species are one of the crucial considerations in the field of natural ecology when conducting environmental impact assessments (EIAs). The occurrence of legally protected species, especially 'Endangered Wildlife' designated by Ministry of Environment, significantly influences the progression of projects subject to EIA, necessitating clear investigations and presentations of their habitats. In perspective of statistics, a minimum of 30 occurrence coordinates is required for population prediction, but most of endangered wildlife has insufficient coordinates and it posing challenges for distribution prediction through modeling. Consequently, this study aims to propose modeling methodologies applicable when coordinate data are limited, focusing on Rodgersia podophylla, representing characteristics of endangered wildlife and northern plant species. For this methodology, 30 random sampling coordinates were used as input data, assuming little survey data, and modeling was performed using individual models included in BIOMOD2. After that, the modeling results were evaluated by using discrimination capacity and the reality reflection ability. An optimal modeling technique was proposed by ensemble the remaining models except for the MaxEnt model, which was found to be less reliable in the modeling results. Alongside discussions on discrimination capacity metrics(e.g. TSS and AUC) presented in modeling results, this study provides insights and suggestions for improvement, but it has limitations that it is difficult to use universally because it is not a study conducted on various species. By supporting survey site selection in EIA processes, this research is anticipated to contribute to minimizing situations where protected species are overlooked in survey results.

• 한국전자거래학회지
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• 제4권1호
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• pp.145-157
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• 1999

The challenge is to maximize the time-to-market benefits of concurrent engineering while maintaining control of data and distributing it automatically to the people who need it when they need it. The way PDM systems cope with this challenge is that master data is held only once in a secure vault where its integrity can be assured and all changes to it monitored, controlled and recorded. The structure of PDM is various from vendor, but they have common module. That is PDM and it is most important. The goal is to design the workflow in PDM using object-oriented modeling method. The past methods have concentrated on the flow between workflow engine and agent, but this paper will focus on task. We will model task as individual object. This paper uses OMT(Object Modeling Technique) by James Rumbaugh for base modeling tool and uses DCOM(Distributed Component Object Model) for base ORB(Object Request Broker). Research object is to design the static object model, to design state change by dynamic model and to design data transition by functional model.

• 한국해양공학회지
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• 제11권3호
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• pp.200-211
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• 1997

Most recently, offshore Engineering & Construction field is concerned about integration management technology such as CIM(Computer Integrated Manufacturing), PDM(Product Data Management) and Enterprise Information Engineering in order to cope with the rapid change of engineering and manufacturer specification as per owner's requirement during construction stage of the project. System integration and integrated data modeling with relational database in integration management technology improve the quality of product and reduce the period of the construction project by reason of owing design information jointly. This paper represents the design methodology of system integration using Business Process Reengineering by the case study. The case study is about the offshore plant material information process from front end engineering design to detail engineering for the construction and the basis of monitoring system by integrating and sharing the design information between the 2D intelligent P&ID and 3D plant modeling using relational database. As a result of the integrated data modeling and system integration, it is possible to maintain the consistency of design process in point of view of the material balancing and reduce the design assumption/duration. Near future, this system will be expanded and connected with the MRP(Material Requirement Planing) and the POR (Purchase Order Requisition) system.

• 한국초등과학교육학회지:초등과학교육
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• 제41권4호
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• pp.673-689
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• 2022

계절 변화를 이해하기 위해서는 3차원 공간 속에서 천체들의 관계를 이해하는 것이 필요하며 이를 위해 학생들이 직접 3차원 모델을 구성하여 사용하고, 평가 및 수정하는 모델링 활동이 중요하다. 이 연구에서는 초등학생이 지구본과 전구를 사용하여 계절 변화 원인으로서 지구의 운동을 3차원 공간에서 모델링하는 과정을 분석하였다. 초등학교 6학년 17명이 참여하였으며 모델링 수업은 계절 변화와 관련된 현상과 개념을 탐색한 뒤 현상의 원인이 되는 지구의 운동을 지구본과 전구를 사용하여 학생들이 직접 모델을 구성하고 이를 활용하여 계절 변화를 설명하는 과정으로 진행되었다. 학생들의 모델링 과정을 녹화한 비디오 자료, 학생들의 활동지, 사후 면담 전사본을 연구 자료로 사용하였고, 삼각 검증을 통해 자료의 신빙성을 확보하였다. 모델링 수준 분석 틀은 선행 연구를 기초로 구성하였으며 모델에 대한 이해와 모델링 실행뿐만 아니라 지구의 운동 관련 개념을 고려하여 구성하였다. 최종 확정된 분석틀에서는 3차원 모델링 수준을 1수준부터 3수준까지 구분하였고 각 수준에서 나타날 수 있는 학생의 수행을 구체화하였다. 연구 결과, 계절 변화를 설명하기 위한 초등학생의 지구본 활용 모델링 수준은 크게 두 가지로 나타났다. 지구의 자전 및 자전축의 기울기, 지구의 공전을 고려하였으나 경험적 증거를 활용하지 못하는 수준(2수준)과 지구의 자전 및 자전축의 기울기, 공전을 고려하고 경험적 증거를 활용하는 수준(3수준)으로 나타났다. 그러나 학생들이 경험적 증거를 활용하여 모델링을 하는 경우도 과학적 모델 구성으로 이어지지 못하였는데, 이 연구에서는 그 원인을 모델링 시 사용하는 도구의 특징과 관련지어 탐색하였다.

• 복식
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• 제66권3호
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• pp.147-161
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• 2016

This study analyzed the effects of job style on job satisfaction and turnover intention of fashion models, and the difference in the job style, job satisfaction and turnover intention by model activities period. Data was collected by surveying fashion models with more than 10 modeling experiences, and 230 responses were used in the data analysis. The results of were as follows: First, the job style of fashion models were classified into professional ability type, social relationship-focused type, future-oriented type and body-boasting type. Job satisfaction was classified into satisfaction with working conditions, satisfaction with model activities, and satisfaction with relationships. Turnover intention was classified into intention to change jobs, and intention to quit modeling. Second, being a professional ability type had a negative effect on satisfaction with working conditions, whereas being a future-oriented type had a positive effect on it. The professional ability type and social relationship-focused type had a positive effect on satisfaction with model activities, and the social relationship-focused type had a positive effect on satisfaction with relationships. Third, the future-oriented type and body-boasting type had a negative effect on the intention to change jobs. The social relationship-focused type, future-oriented type and body-boasting type had a negative effect on the intention to quit modeling. Fourth, there were significant differences in the professional ability type, human relationship-focused type, body-boasting type, intention to change jobs and intention to quit modeling by model activities period. Therefore, it is necessary for domestic fashion models to have the appropriate attitude to develop features and competency required for modeling projects and if improvements are made to enhance job satisfaction of fashion models, the fashion modeling industry is expected to make further developments.