• Proceedings of the Korean Information Science Society Conference
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• 2000.04b
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• pp.172-174
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• 2000

기업과 산업등 여러분야에 적용하기 위하여 인공지능, 통계학, 데이터베이스등의 각 분야에서 활발히 연구되고 있는 데이터마이닝은 알 수 없는 미래에 대한 예측이 가능하다는 장점을 갖기 때문에 더욱 가치가 있다. 데이터셋을 설명하기 위한 설명모델링과 예측을 하기 위한 예측모델링의 두 가지 범주로 나뉘어 발전되어왔으나, 데이터셋을 설명하기 위한 분석보다는 미래를 예측하기 위한 분석의 중요성이 점점 증가되고 있다. 이 논문에서는 마코프 성분을 갖는 과거의 이력 데이터를 기반으로 일정한 시점 또는 일정 기간동안의 변화량을 예측할 수 있는 예측모델링 방법을 제시한다.

• Journal of the Korea Institute of Information and Communication Engineering
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• v.26 no.1
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• pp.49-57
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• 2022

Recently, various uses of artificial intelligence have been made possible through the deep artificial neural network structure of machine learning, demonstrating human-like capabilities. Unfortunately, the deep structure of the artificial neural network has not yet been accurately interpreted. This part is acting as anxiety and rejection of artificial intelligence. Among these problems, we solve the capability part of artificial neural networks. Calculate the size of the artificial neural network structure and calculate the size of data that the artificial neural network can process. The calculation method uses the group method used in mathematics to calculate the size of data and artificial neural networks using an order that can know the structure and size of the group. Through this, it is possible to know the capabilities of artificial neural networks, and to relieve anxiety about artificial intelligence. The size of the data and the deep artificial neural network are calculated and verified through numerical experiments.

• Review of KIISC
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• v.31 no.5
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• pp.5-12
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• 2021

코로나19 팬데믹은 현실뿐만 아니라 사이버 공간에도 지대한 영향을 미쳤다. 재택근무와 비대면(온라인) 회의 뿐만 아니라 온라인 게임/쇼핑과 스트리밍 서비스 등과 같이 네트워크를 활용한 서비스의 이용자가 급증하였으며, 이로 인해 사이버 공간은 더욱 활성화되고 확장되었다. 그러나 사이버 공간의 확장은 이를 대상으로 하는 사이버 공격들도 함께 증가시켰으며, 그 피해규모 또한 증가하고 있어 대응방안 마련이 매우 시급한 상황이다. 본 논문에서는 코로나19 팬데믹 영향에 따른 사이버공격 동향을 살펴보고, 실제 사이버위협을 탐지·대응하는 보안관제, 침해대응 실무현장에서 발생하는 사이버위협을 분석해 사이버위협 동향 변화를 확인해 본다. 또한, 대응기술로서 인공지능과 설명가능 인공지능 기반 정보보호 연구·개발에 대해 소개한다.

• Review of KIISC
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• v.29 no.3
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• pp.14-21
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• 2019

인터넷 상에서 개인정보보호 등 안전성 강화를 위해 암호통신이 지속적으로 증가하고 있다. 특히, 해커들도 사이버공격 행위 은닉 및 탐지기법 우회를 목적으로 암호통신을 적극 활용하는 추세이다. 이러한 상황에서, 네트워크 트래픽 상에서 평문형태의 패턴매칭을 통해 사이버공격을 탐지하는 기존의 방법으로는 한계점에 당면한 상황이다. 따라서, 본 논문에서는 암호통신 기반 사이버공격을 효과적으로 탐지하기 위하여 인공지능 및 설명가능 인공지능 기술을 접목하기 위한 연구 개발 동향을 소개한다.

• Journal of The Korean Association of Information Education
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• v.25 no.3
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• pp.491-499
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• 2021

Major countries in the world have established strategies for educating about artificial intelligence(AI) and with large investments are actively implementing these strategies. With this trend, domestic ministries have made efforts to establish national strategies to better educate students about AI. This paper presents the syllabus of AI classrooms which has been developed and presented to pre-service and in-service elementary school teachers for their use. In addition, the AI education tools they particularly preferred and their future plans for utilizing them in the elementary school classroom were investigated. Through this study, it was found that pre-service and in-service elementary school teachers strongly prefer lectures about AI education tools that can be immediately applied in the classroom, rather than learning about the theoretical basis of AI. At issue, however, is that the ability to utilize AI is usually based on a sufficient understanding of the theory. Thus, this paper suggests further study to identify better pedagogical practices to improve students' understanding the theoretical basis of AI.

• Journal of Korean Society of Water and Wastewater
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• v.36 no.4
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• pp.239-248
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• 2022

The prediction of algal bloom is an important field of study in algal bloom management, and chlorophyll-a concentration(Chl-a) is commonly used to represent the status of algal bloom. In, recent years advanced machine learning algorithms are increasingly used for the prediction of algal bloom. In this study, XGBoost(XGB), an ensemble machine learning algorithm, was used to develop a model to predict Chl-a in a reservoir. The daily observation of water quality data and climate data was used for the training and testing of the model. In the first step of the study, the input variables were clustered into two groups(low and high value groups) based on the observed value of water temperature(TEMP), total organic carbon concentration(TOC), total nitrogen concentration(TN) and total phosphorus concentration(TP). For each of the four water quality items, two XGB models were developed using only the data in each clustered group(Model 1). The results were compared to the prediction of an XGB model developed by using the entire data before clustering(Model 2). The model performance was evaluated using three indices including root mean squared error-observation standard deviation ratio(RSR). The model performance was improved using Model 1 for TEMP, TN, TP as the RSR of each model was 0.503, 0.477 and 0.493, respectively, while the RSR of Model 2 was 0.521. On the other hand, Model 2 shows better performance than Model 1 for TOC, where the RSR was 0.532. Explainable artificial intelligence(XAI) is an ongoing field of research in machine learning study. Shapley value analysis, a novel XAI algorithm, was also used for the quantitative interpretation of the XGB model performance developed in this study.

• The Journal of Bigdata
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• v.7 no.2
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• pp.195-204
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• 2022

The tourism industry is facing a crisis due to the recent COVID-19 pandemic, and it is vital to improving profitability to overcome it. In situations such as COVID-19, it would be more efficient to sell additional products other than guest rooms to customers who have visited to increase the unit price rather than adopting an aggressive sales strategy to increase room occupancy to increase profits. Previous tourism studies have used machine learning techniques for demand forecasting, but there have been few studies on cross-selling forecasting. Also, in a broader sense, a resort is the same accommodation industry as a hotel. However, there is no study specialized in the resort industry, which is operated based on a membership system and has facilities suitable for lodging and cooking. Therefore, in this study, we propose a cross-selling prediction model using various machine learning techniques with an actual resort company's accommodation data. In addition, by applying the explainable artificial intelligence XAI(eXplainable AI) technique, we intend to interpret what factors affect cross-selling and confirm how they affect cross-selling through empirical analysis.

• Proceedings of the Korea Information Processing Society Conference
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• 2023.05a
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• pp.590-591
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• 2023

최근 사람들의 건강에 대한 관심이 많아지고 다양한 운동 컨텐츠가 확산되면서 실내에서 운동을 할 수 있는 기회가 많아졌다. 하지만, 전문가의 도움없이 정확하지 않은 동작을 수행하다 큰 부상을 입을 위험성이 높다. 본 연구는 CNN 기반 요가 자세 분류 모델을 생성하고 설명가능 인공지능 기술을 적용하여 예측 결과에 대한 해석을 제시한다. 사용자에게 설명성과 신뢰성 있는 모델을 제공하여 자신에게 맞게 올바른 자세를 결정할 수 있고, 무리한 동작으로 부상을 입을 확률 또한 낮출 수 있을 것으로 보인다.

• Proceedings of the Korean Operations and Management Science Society Conference
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• 1998.10a
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• pp.385-388
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• 1998

급격한 경영환경의 변화로 인하여 고객만족을 최우선시하게 됨에 따라, 고객의 다양한 품질 요구를 신속 정확히 만족시키는 것이 주요 경영과제가 되었다. 이러한 상황에 대처 가능한 품질관리가 이루어지기 위해서는 품질기준에 대한 객관적 검증 및 지속적인 보완이 필요하며, 품질설계에 관련된 지식들을 체계적으로 수집하여 공유할 수 있는 체제가 갖추어져야 한다. 이와 같은 목적을 달성하기 위해 인공지능 기법들을 이용한 지능형 품질시스템(Intelligent Quality System, IQS)이 많은 관심을 모으고 있다. 본 연구에서는 일관 제철소의 품질관리를 위해 개발된 IQS중 품질설계 시뮬레이션 지원시스템(Quality Design Simulation Support System, QDSim)에 대해 설명한다. QDSim은 신경망을 기반으로 설계 구현되었는데, 품질설계 시뮬레이션을 지원하기 위해 크게 두가지 기능을 수행한다. 첫째 기능은 주어진 원재료의 구성비와 조업조건에 의해 생산될 제품의 최종 품질특성을 예측하는 것이며, 두 번째는 품질예측치가 고객의 요구 품질, 즉 목표품질을 만족시키는 입력 조건을 찾아가는 것이다. 본 연구에서는 QDSim의 이론적 근거 및 구현내용을 설명한 후, IQS내의 타 시스템과의 관계를 설명한다.

• The Mathematical Education
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• v.62 no.3
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• pp.435-455
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• 2023

This study primarily focused on the development of an Explainable Artificial Intelligence (XAI) model to discern and analyze papers with significant impact in the field of mathematics education. To achieve this, meta-information from 29 domestic and international mathematics education journals was utilized to construct a comprehensive academic research network in mathematics education. This academic network was built by integrating five sub-networks: 'paper and its citation network', 'paper and author network', 'paper and journal network', 'co-authorship network', and 'author and affiliation network'. The Random Forest machine learning model was employed to evaluate the impact of individual papers within the mathematics education research network. The SHAP, an XAI model, was used to analyze the reasons behind the AI's assessment of impactful papers. Key features identified for determining impactful papers in the field of mathematics education through the XAI included 'paper network PageRank', 'changes in citations per paper', 'total citations', 'changes in the author's h-index', and 'citations per paper of the journal'. It became evident that papers, authors, and journals play significant roles when evaluating individual papers. When analyzing and comparing domestic and international mathematics education research, variations in these discernment patterns were observed. Notably, the significance of 'co-authorship network PageRank' was emphasized in domestic mathematics education research. The XAI model proposed in this study serves as a tool for determining the impact of papers using AI, providing researchers with strategic direction when writing papers. For instance, expanding the paper network, presenting at academic conferences, and activating the author network through co-authorship were identified as major elements enhancing the impact of a paper. Based on these findings, researchers can have a clear understanding of how their work is perceived and evaluated in academia and identify the key factors influencing these evaluations. This study offers a novel approach to evaluating the impact of mathematics education papers using an explainable AI model, traditionally a process that consumed significant time and resources. This approach not only presents a new paradigm that can be applied to evaluations in various academic fields beyond mathematics education but also is expected to substantially enhance the efficiency and effectiveness of research activities.