인기 검색어의 순위 변화 예측

김도형(Dohyeong Kim),강병호(Byeong Ho Kang),이승룡(Sungyoung Lee) Korean Institute of Information Scientists and Eng 2017 정보과학회논문지 Vol.44 No.8

The service, Hot Search Keywords, provides a list of the most hot search terms of different web services such as Naver or Daum. The service, bases the changes in rank of a specific search keyword on changes in its users’ interest. This paper introduces a temporal modelling framework for predicting the rank change of hot search keywords using past rank data and machine learning. Past rank data shows that more than 70% of hot search keywords tend to disappear and reappear later. The authors processed missing rank value, using deletion, dummy variables, mean substitution, and expectation maximization. It is however crucial to calculate the optimal window size of the past rank data. We proposed an optimal window size selection approach based on the minimum amount of time a topic within the same or a differing context disappeared. The experiments were conducted with four different machine-learning techniques using the Naver, Daum, and Nate Hot Search Keywords datasets, which were collected for 2 years.

대규모 산업시설에서 고장보고서로부터 고장지식 추출 프레임워크 개발

김도형(Dohyeong Kim),강병호(Byeong Ho Kang),이승룡(Sungyoung Lee) 인문사회과학기술융합학회 2018 예술인문사회융합멀티미디어논문지 Vol.8 No.3

대규모 산업시설은 고장 진단 및 조치는 현장 전문가에 의해 이루어진다. 하지만, 모든 고장을 한 정된 현장 전문가에 의존하는 것은 한계가 있다. 이러한 이유로 산업계에서는 고장보고서를 기록하여, 추후 고장 조치에 이용하고자 축적하고 있다. 하지만, 지식 재이용에 대한 접근이 없어 적합한 자료 를 적시에 획득하지 못하기 때문에 고장조치가 늦어지고 그로 인한 조업 지연으로 경제적 손실을 초 래하고 있다. 따라서 본 논문에서는 자연어로 작성된 고장보고서를 시스템이 이용할 수 있도록 정형 지식으로 자동으로 변환하고, 사용자가 직접 지식을 구축할 수 있는 고장지식 추출 프레임워크를 개 발했다. 실제 공장에서 작성된 고장보고서를 분석하여 문장 패턴을 도출하였으며 이를 통해서 자동으 로 분석된 고장보고서 내용을 필요한 경우 사용자가 직접 지식을 수정할 수 있는 인터페이스를 제공 하여, 손쉽게 고장지식 추출이 가능하다. 제안된 지식 재이용 방법은 도메인 지식관리 및 공장 관리 자동화 시스템에 유용하게 활용될 수 있을 것으로 기대된다. In large-scale industrial plants, fault diagnosis and treatment are conducted by field experts. However, there is a limit to relying on limited number of field experts for all faults. For this reason, the industry records a failure report and accumulates it for use in future trouble shooting. However, it is almost to impossible to search from failure report and reuse this knowledge in the real time so it produces huge delay and becomes a critical industrial disaster. In this paper, we propose the problematic knowledge extraction framework, which allows transferring failure reports to structured knowledge and who filed experts can construct their knowledge easily. The framework automatically transfers the content of analyzed failure report to the structured knowledge, and it provides UI for users to easily modify the knowledge base. The proposed knowledge-reuse approach can be expected to use for domain knowledge maintenance and the industrial plant management automation system.

서울시 공공임대주택의 입지불평등과 연령별 인식차이에 대한 연구

김도형(Kim, Dohyeong),우명제(Woo, Myungje) SH도시연구원 2018 주택도시연구 Vol.8 No.2

The public rental housing system has been criticized, because of an inefficient location of residence. Because low-income people are highly dependent on transit, the location of public rental housing and accessibility to public transport can impact residents’ quality of life. In addition to location inequality, the recent diversification of residents’ ages in public rental housing has been a challenge, for developing an appropriate policy for public rental housing customized by age group. The purpose of this study is to measure accessibility and inequality of transit services in Seoul using the Lorenz-curve and Gini-index for each Gu as a whole and its public rental housing; to analyze the inequality of transit services by mode, Gu, and the housing type; and to compare the actual accessibility and its perception of residents by age group, and housing type, using correlation analysis. Findings are as follow. First, there is a variation in the inequality of location of public rental housing in terms of transit services. Second, relatively young residents show dissatisfaction with accessibility of transit, although the actual accessibility is decent. Third, residents with a higher average age, reveal consistent perception on the accessibility with the actual accessibility. Results suggest that diversification of demand for public rental housing in terms of age group, should be considered when policies are developed, particularly for their location.

압축플랜지에 절곡강판을 적용한 강박스거더의 유한요소해석

김도형(Kim, Dohyeong),이성철(Lee, Sung Chul) 대한토목학회 2017 대한토목학회 학술대회 Vol.2017 No.10

표면 젖음성을 이용한 물/오일 분리막 제작

김도형 ( Dohyeong Kim ),안태창 ( Taechang An ) 한국센서학회 2016 센서학회지 Vol.25 No.3

The superhydrophobic and superoleophobic meshes surfaces have been used in various applications such as self-cleaning, anti-icing, gas exchange, oil-water separation, sound-wave penetrable anti-wetting structures, etc. In particular, there are many studies for oil-water separation with environmental issues. Because of high pressure and dynamic environment, oil-water separation filters must have stable surface properties as super-hydrophobicity and superoleophobicity. The oleophobicity of surface depends on the surface chemistry and roughness of the surface. The roughness of oleophobic surface enhances its static contact angle and stability. The multi-scale hierarchical structure provides a stable superhydrophobic state by maintaining a Cassie state. In this research, we fabricated a superoleophobic mesh with a multi-scale hierarchical structure to increase the pressure resistance and adjusted a size of the mesh hole.

지하철 내 공간모델일을 통한 라돈 농도 변화 예측 연구

김도형(Dohyeong Kim),서성철(Sungchul Seo) 대한지질학회 2022 대한지질학회 학술대회 Vol.2022 No.10

안정적 초소수성 표면 구조를 위한 3층 나노 구조 제작

김도형(Dohyeong Kim),안태창(Taechang An) 대한기계학회 2016 대한기계학회 춘추학술대회 Vol.2016 No.12

차동 모드 캐패시턴스를 이용한 광대역 4-Way Wilkinson 전력 분배기/합성기

김도형(Dohyeong Kim),서희주(Huiju Seo),조문규(Moon-Kyu Cho) 대한전자공학회 2023 대한전자공학회 학술대회 Vol.2023 No.6

3·1 운동의 설계자 및 전달자에 대한 분석과 독립선언서 낭독 문제 연구 : 한위건(1898~1937)과 정재용(1886~1976)을 중심으로

김도형(Kim Dohyeong) 백산학회 2020 白山學報 Vol.0 No.117

본 논문의 목적은 첫째, 3·1운동을 설계했던 ‘설계자’ 한위건과 지역 간 정보를 전달해주었던‘전달자’ 정재용에 관한 사료를 분석하는 것이다. 계획자 한위건과 연관된 법정자료를 분석하고전달자 정재용의 활동을 역사적으로 소개하는 것과 동시에 3·1운동과 관련한 두 사람의 활동에대해 역사적 사실관계를 규명하는 것이다. 둘째, 독립선언서 낭독자가 누구인지를 논할 때 한위건과 정재용이 거론되는데, 핵심 논쟁을 분석하여 선언서 낭독 문제 해결의 실마리를 찾고자한다. 한위건은 1·2차 만세운동을 계획하였다. 그는 운동의 성공을 위해 학생들 참여를 독려하고 선언서 배포에도 관여하였으며 격문의 초안을 작성하기도 하였다. 정재용은 3·1운동의 또다른 설계자였던 박희도를 도와 지역 간 정보 및 선언서를 전달하였다. 이로 인해 두 사람 모두선언서 낭독에 대한 가능성이 크다고 할 수 있다. 그렇지만 두 사람에게는 낭독과 관련하여많은 문제점이 발견되었다. 이를 해결하기 전까지는 특정 인물에 대한 가능성은 논의할 수 있지만, 구체적 확정에는 미흡한 점이 있음을 밝혔다. The purpose of this paper is to first analyze the historical data about Han We geon, the planner who planned the March 1st Movement, and Jeong Jae yong, the passenger who delivered information between regions. It is to analyze court data related to the planner Han We geon and to historically introduce the activities of the messenger Jeong Jae yong, while at the same time uncovering the historical facts of the two regarding the March 1st Movement. Second, Han Wi-gun and Jung Jae-yong are mentioned when discussing who read the Declaration of Independence, and we would like to analyze the key dispute to find a clue to the solution of the declaration reading problem. For the success of the Manse Movement, Han We geon encouraged students to participate, participated in the distribution of the declaration, and drafted the manifesto. Jeong Jae yong helped Park Hui-do, another architect of the March 1st Movement, to deliver information and declarations between regions. This suggests that both are highly likely to read the declaration. However, many problems with reading have been discovered for the two. Until this is resolved, the possibility of a specific person can be discussed, but there is a lack of concrete confirmation.

동학민요 파랑새노래 연구

김도형(Kim Dohyeong) 한국언어문학회 2008 한국언어문학 Vol.67 No.-

The study intensively dealt with the meaning of Blue Bird Song, the folk song of Donghak. First, the study reviewed the song by classifying it into its type and considered the historical and cultural context all together. Based on an understanding of the initial meaning of the song, the study approached the in-depth meaning of it, and further, the study revealed the symbolic meaning of ‘the blue bird’. At the same time, the study attempted an overall approach in order to review the pattern of the blue bird appearing in diverse genres of literature. ‘The blue bird’ is a combination of ‘blue’ and ‘ a bird’. A bird is perceived as a messenger who delivers the will of Heaven to humans. The blue color symbolizes the ideal human image, and spiritual aspiration. Accordingly, ‘the Blue Bird’ in Blue Bird Song should be seen not as a physical thing, but as a sort of an emblem, that is, a symbol of ‘being greenish’.