• 제목/요약/키워드: Symbolic regression

검색결과 52건 처리시간 0.027초

조선분야의 축적된 데이터 활용을 위한 유전적프로그래밍에서의 선형(Linear) 모델 개발 (Implementing Linear Models in Genetic Programming to Utilize Accumulated Data in Shipbuilding)

  • 이경호;연윤석;양영순
    • 대한조선학회논문집
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    • 제42권5호
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    • pp.534-541
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    • 2005
  • Until now, Korean shipyards have accumulated a great amount of data. But they do not have appropriate tools to utilize the data in practical works. Engineering data contains experts' experience and know-how in its own. It is very useful to extract knowledge or information from the accumulated existing data by using data mining technique This paper treats an evolutionary computation based on genetic programming (GP), which can be one of the components to realize data mining. The paper deals with linear models of GP for the regression or approximation problem when given learning samples are not sufficient. The linear model, which is a function of unknown parameters, is built through extracting all possible base functions from the standard GP tree by utilizing the symbolic processing algorithm. In addition to a standard linear model consisting of mathematic functions, one variant form of a linear model, which can be built using low order Taylor series and can be converted into the standard form of a polynomial, is considered in this paper. The suggested model can be utilized as a designing tool to predict design parameters with small accumulated data.

Nonlinear finite element based parametric and stochastic analysis of prestressed concrete haunched beams

  • Ozogul, Ismail;Gulsan, Mehmet E.
    • Structural Engineering and Mechanics
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    • 제84권2호
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    • pp.207-224
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    • 2022
  • The mechanical behavior of prestressed concrete haunched beams (PSHBs) was investigated in depth using a finite element modeling technique in this study. The efficiency of finite element modeling was investigated in the first stage by taking into account a previous study from the literature. The first stage's findings suggested that finite element modeling might be preferable for modeling PSHBs. In the second stage of the research, a comprehensive parametric study was carried out to determine the effect of each parameter on PSHB load capacity, including haunch angle, prestress level, compressive strength, tensile reinforcement ratio, and shear span to depth ratio. PSHBs and prestressed concrete rectangular beams (PSRBs) were also compared in terms of capacity. Stochastic analysis was used in the third stage to define the uncertainty in PSHB capacity by taking into account uncertainty in geometric and material parameters. Standard deviation, coefficient of variation, and the most appropriate probability density function (PDF) were proposed as a result of the analysis to define the randomness of capacity of PSHBs. In the study's final section, a new equation was proposed for using symbolic regression to predict the load capacity of PSHBs and PSRBs. The equation's statistical results show that it can be used to calculate the capacity of PSHBs and PSRBs.

도시의 검색키워드 유형이 페이스북 페이지 팬 수 및 관광객 수에 미치는 영향에 관한 연구: 서울시를 중심으로 (The Effects of City's Search Keyword Type on Facebook Page Fans and Inbound Tourists : Focusing on Seoul City)

  • 최지혜;이효복
    • 디지털융복합연구
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    • 제15권10호
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    • pp.93-101
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    • 2017
  • 본 연구는 도시에 대한 키워드 검색량을 관심의 지표로 보고 검색키워드를 유형화하여 각 유형별 검색량이 페이스북 팬 수 및 관광객 수에 미치는 영향을 고찰하고자 하였다. 위계적 커뮤니케이션 효과 모형에 따르면 커뮤니케이션의 효과는 인지-태도-행동의 순차성을 띄는 것으로 나타난다. 이에 따라 검색행동을 통해 특정 도시에 대한 관여 및 지식이 높아진 관광 소비자가 호감을 느끼게 되면 페이스북 팬페이지 가입을 통해 보다 적극적인 정보탐색을 할 것이며, 직접적인 관광행동으로 이어질 것이라고 예측하였다. 이를 위해 구글 트렌드에 나타난 서울시 관련 검색 키워드의 유형 별 검색량과 서울시 해외 공식 계정인 'Seoul Korea'의 팬 수, 마지막으로 서울시 외국인 관광객 수 간의 영향 관계를 검증하였다. 분석결과, 서울시의 검색 키워드 유형은 관광매력 키워드, 자연환경 키워드, 상징적 키워드, 접근적 키워드로 도출되었으며 그 중 페이스북 팬 수에 영향을 미치는 요인은 관광매력 키워드과 상징적 키워드인 것으로 나타났다. 또, 관광매력 키워드와 상징적 키워드는 서울시 페이스북 팬 수를 매개로 서울시 관광객 수에 영향을 미친다는 결과가 도출되었다. 이러한 결과에 따라, 앞으로의 서울시의 외국인 관광 소비자를 대상으로는 관광매력적인 요소와 한국적인 요소를 강조한 메시지를 소구하는 것이 유효할 것이라는 실무적 함의를 제공할 수 있다.

스토리텔링 테마골목 이미지 및 만족도에 관한 이용 후 평가 - '김광석다시그리기길'을 대상으로 - (Post Occupancy Evaluation of Image and Satisfaction for Storytelling Theme on the Kim Gwang-Seok Street)

  • 구민아;엄붕훈
    • 한국조경학회지
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    • 제46권5호
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    • pp.59-68
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    • 2018
  • 본 연구는 최근 도시재생사업으로 재개발, 계획되고 있는 가로 중 스토리텔링에 의한 테마골목인 '김광석다시그리기 길'을 대상으로 이용 후 평가를 이미지와 만족도를 중심으로 시행하였다. 이는 새로운 장소성을 가진 공간으로 스토리텔링 테마골목 중 낙후된 골목재생을 위해 우리나라 최초로 대중가수의 음악과 예술에 관한 주제로 스토리텔링 장소로써 지속적인 모니터링을 통해 계획, 관리에 필요한 자료가 되기 위해서이다. 이용자 200명을 대상으로 인구통계문항과 이용행태, 동기는 빈도분석을 실시하였으며, 이미지선호도와 만족도평가는 신뢰도분석, 평균치 분석, 요인분석, 다중회귀분석을 실시하여 만족도에 영향을 미치는 변수들을 추출하였다. 또한, 성별, 연령별, 지역별 그룹의 이미지와 만족도 차이를 분산분석과 독립표본 t-검정과 분산분석을 통해 분석하였다. 그 결과, 이용자 특성은 20대 학생이 가장 많았고, 이용 동기와 활동유형은 산책과 구경, 사진촬영 순으로 분석되었다. 이미지평가 변수들은 매우 높은 신뢰도를 보였으며, 평균치들은 상징적인(5.03), 친근한(4.84), 아름다운(4.71), 밝은(4.63) 등의 순으로 높았다. 요인분석 결과, 거리의 분위기, 디자인성 및 역동성 등의 3개 요인이 추출되었다. 다중회귀분석 결과, 상징적인(${\beta}=.314$), 안정된(${\beta}=.248$), 친근한(${\beta}=.204$), 시원한 (${\beta}=.142$)과 같은 이미지 변수들에 의해 이미지 선호도가 영향을 받는 것으로 분석되었다. 만족도평가 또한 매우 높은 신뢰도를 가지며, 요인분석 결과, 시설관리측면, 체험 요인, 이미지 요인 3가지로 분류되었고, 시설물디자인(3.81), 대표거리(3.78), 거리이미지(3.81), 지속적 이용(3.66), 체험관광(3.53) 순으로 만족도를 보였다. 다중회귀분석 결과, 거리이미지(${\beta}=.296$), 관리(${\beta}=.277$), 지속적 이용(${\beta}=.205$), 대표거리(${\beta}=.183$)에 관한 4개 변수가 만족도에 영향을 주는 것으로 분석되었다. 따라서 김광석다시그리길 스토리텔링 골목의 재생사업 이후, 골목의 이미지는 상징성과 경관미, 친근감 등에서 높은 평가를 받으며 이미지 개선에 성공한 것으로 보이고, 만족도에 있어서는 시설물디자인의 개선, 대표거리로서의 상징성과 이미지의 강화, 다양한 체험 등에서 만족도를 보이고 있는 것으로 평가된다. 추후 김광석다시그리기길의 계획과 관리에서는 좀 더 스토리텔링을 통한 장소성을 확립하고, 그로 인해 골목의 정체성과 상징성 또한 높아질 수 있도록 해 나가야 함을 말해 주는 결과로 사료된다.

한국 근대 소비문화의 역사적 형성과정과 특성에 관한 연구 -복식과 관련된 소비를 중심으로- (A Study of the Historical Formation and Characteristics of Modern Korean Consumption Culture -Focused on Consumption Related to Dress-)

  • 김은정;윤태영;고수진;고애란
    • 한국의류학회지
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    • 제34권11호
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    • pp.1786-1797
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    • 2010
  • This study investigates the historical formation and characteristics of modern Korean consumption culture by reviewing previous literature about consumption spaces and conspicuous consumption in modern Korea. This study examined the historical formation and characteristics of three different periods of time: from 1876 to 1919, from 1920 to 1936, and from 1937 to 1945. In addition, the current study reviews previous literature related to advertising, poems, novels, historical events, and Orientalism. Based on this, the historical characteristics were also analyzed. The overall results were as follows: The first period from 1876 to 1919 was the beginning of modern Korean consumption culture, in which exotic goods such as foreign fabrics were preferred and consumed. In addition, clothing was simplified and westernized through modern reform. The second period of time, 1920 to 1936, was the development stage of modern Korean consumption culture that formed the foundation of modern consuming spaces where the recognition of the human form became more modern, and 'modern girls' styles appeared. The final period, 1937 to 1945, was the regression stage of Korean modern consumption culture, in which consumption decreased during the Sino-Japanese War and World War II. The results of this study' conclude that the leading-consumer items hold symbolic value as well as became signifiers within modern consumption spaces such as modern Korean department stores and that women were recognized as modern leading-consumers as shown by the dramatic increase in the number of products that targeted women.

시계열 섭동 모델링 알고리즘 : 운전자 프로그래밍과 양자역학 섭동이론의 통합 (Time Series Perturbation Modeling Algorithm : Combination of Genetic Programming and Quantum Mechanical Perturbation Theory)

  • 이금용
    • 정보처리학회논문지B
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    • 제9B권3호
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    • pp.277-286
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    • 2002
  • 양자역학 섭동이론과 유전자프로그래밍(GP) 기법을 접목시킴으로써 실세계(Real-world)에서 발생하는 카오스 시계열에 대하여 수학모델을 구축, 예측하기 위한 새로운 알고리즘을 개발하였다. 시계열 분석과 양자역학 파동방정식의 해를 구하는 섭동이론과의 절차적 유사성을 논하고, 이것을 GP로 구현하는 전형적 접근방안을 제시한다. 함수집합(Function Set)으로서 직교함수(Orthogonal Functions)를 이용하고 병렬 집단을 사용하는 GP를 이용하여 원 시계열에 대한 초기 수학모델을 구하고, 원 시계열 데이터로부터 모델의 평가값을 뺀 나머지로 구성되는 잔여 시계열에 대하여 다시 GP를 적용하는 과정을 일정한 종료조건이 충족될 때가지 반복함으로써 실세계 카오스 시계열에 대한 정확성 높은 수학모델을 구축하는데 성공하였다. 타 방법론과의 비교와 향후 해결과제에 대하여도 소개한다.

도시공원의 지역적 정체성 평가와 유용성 - 수도권 신도시를 중심으로 - (An Evaluation for Regional Identity of Urban Parks and It's Utility -focused on the new towns in the Capital Region-)

  • 오정학;고동완;김유일
    • 한국조경학회지
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    • 제27권1호
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    • pp.79-89
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    • 1999
  • Recent expansion of urban parks has been partly successful in terms of providing urban outdoor recreation space. Unfortunately we paid very little attention to the importance of providing regional identity to urban parks until recently. Thus one of the most important tasks of the contemporary landscape architects of Korea is to investigate ways to improve regional identity of urban parks. This study is aimed at evaluating how well the current urban parks have realized their own regional identity. To test the effectiveness of the concept of 'identity', the identity items were created, while a research model was developed by using such variables as in urban park identity, park satisfaction, belongingness to the region, and residential satisfaction. In order to test the model, the causations were analyzed. Meanwhile, the scales to evaluating identity were reviewed by means of the unstructures group interview, and were finally determined as 10 items; culture, uniqueness, symbolic, historic nature, homogeneity, harmony, difference, public benefit, nativeness and traditionality. Data from three new towns in the capital region-Bundang, Ilsan and Sanbon-were collected, and their central parks were referred to a questionnaire survey. The data were processed using descriptive statistics, correlation analysis, multiple regression analysis and path analysis. It was found through this survey that subjects 'sentiments regarding the sample towns' regional identity differed slightly. Residents of Bundang felt the strongest amount of regional identity, followed by those of Ilsan and Sanbon. In addition, the most important scale on regional identity is 'park satisfaction', followed by 'belongingness to the region' and 'residental satisfaction'. The path analysis was conducted to interpret the causations in a more detailed and comprehensive way than correlation analysis. As a result, it was proven that the regional identity affects 'belingingness to region' through the intermediated variable 'park satisfaction', while affecting ' residential satisfaction' through the intermediate variables 'park satisfaction' and 'beligningness to region'. In other words, although the regional identity of a park does not directly affect 'belongingness to region' or 'residental satisfaction', it has indirect effects on them through intermediate variables.

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천연염색제품 구매 평가기준 및 구매 후 만족도 (A study on the Purchase Appraisal Standard and Post-purchase Satisfaction of Natural Dyeing Products)

  • 박영희
    • 한국의류산업학회지
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    • 제14권1호
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    • pp.64-74
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    • 2012
  • The purpose of this study was to find purchase appraisal standard and post-purchase satisfaction for natural dyeing products. The data used for this study were collected from the women in their from 20's to 50's who are living in the regions of Busan, Ulsan, and Gyeongnam in Korea. The questionnaire of 537 copies was used for a statistical analysis. To analyze data, 2-test, t-test, Cronbach's a test, factor analysis, ANOVA, Duncan test, regression analysis, etc. were carried out. A used statistical package was SPSS 14.0. The analysis results were as follows. The purchase appraisal standards for natural dyeing products were identified as practicality and reliability, suitability of use, symbolic property of status, design property, and convenience of buying. As the analysis result for purchase appraisal standard according to the demographic characteristics, the purchase appraisal standard according to most demographic characteristics showed significant difference. The factors of post-purchase satisfaction for natural dyeing products were verified as product modification and durability, design and price, hygienic property and product quality. As the analysis results of post-purchase satisfaction for natural dyeing products according to demographic characteristics, the post-purchase satisfaction according to demographic characteristics showed significant difference. The factors affecting post-purchase satisfaction were verified as product quality, kinds of item, color change, product lifespan, color change, etc. Consequently, because the purchase appraisal standard of natural dyeing product is very various, it is necessary to enhance post-purchase satisfaction of natural dyeing products by reflecting these factors in advance at the product development stage.

슈퍼 히어로 피규어의 외형적 시각요소 평가에 따른 구매의도 (Purchase Intention depending on Appraisal of Outward Visual Elements in Superhero Action Figures)

  • 김준수
    • 디지털콘텐츠학회 논문지
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    • 제18권3호
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    • pp.543-550
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    • 2017
  • 슈퍼 히어로 영화는 모든 세대를 아우를 수 있는 새로운 장르 컨벤션을 형성하였다. 영상콘텐츠에서 파생된 피규어는 전문적인 조형기술을 통해 제작된 입체 조형물이다. 피규어에 대한 소유는 가상과 현실을 연결시켜 주는 매개체로써 상징적 의미를 가진다. 이러한 관점에서 피규어는 콘텐츠 산업의 시장 확장에 따른 파생된 캐릭터 상품으로써 중요한 부분을 차지한다. 이러한 맥락에서 본 연구는 슈퍼히어로 피규어의 외형적 시각요소 평가가 구매의도에 어떠한 영향을 미치는가를 분석함으로써 소비자구매형태를 확인하는 것이 그 목적이다. 이를 위해 독립변인을 캐릭터의 외형적 시각요소 평가로써 색상, 신체유형, 얼굴모양, 동작으로, 종속변인은 구매의도로 하여 다중회귀분석을 실시하였다. 분석결과, 색상, 신체유형, 얼굴모양은 구매의도에 긍정적 영향을 미치는 것으로 나타났고, 동작은 구매의도에 유의미한 영향력이 없는 것으로 나타났다.

The Effects of Compliance Timing on Multinational Enterprises' Corporate Performance in China: An Application of Institutional Perspectives

  • Yang, Woo-Young;Han, Byoung-Sop
    • Journal of Korea Trade
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    • 제24권4호
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    • pp.71-94
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    • 2020
  • Purpose - Multi-National Enterprises (MNEs) tend to face a high level of institutional pressures in regions with high institutional development level. When complying with institutional pressures, firms try to make decisions to maximize profit while minimizing the risks to them. The purpose of this study is to investigate the influence of the institutional development level on institutional compliance timing by MNEs and the relationship between compliance speed and corporate performance. Design/methodology - The research focuses on three main variables, which are the institutional development level (as a determination of the institutional pressure level), the firm's compliance speed (as a determination of the compliance timing), and the firm's financial performance (as a determination of the corporate performance). We collected 19,869 firm-level data from CSMAR (the China Stock Market and Accounting Research), 6,922 CSR data from RKS (the Rankins CSR Ratings), and province and city-level data from the NERIM (National Economic Research Institute Index of Marketization) and NBSC (National Bureau of Statistics of China). The firms in China were chosen for analysis, and the analysis period was from 2008 to 2017. Random Effects GLS Regression was used to test the relationships among the variables. Findings - This study examined the effect of the institutional development level on the firm's compliance speed, together with the effect of compliance speed on the firm's financial performance of the MNEs in China. We found that the institutional development level positively influenced firms' financial performances, which means the firms' financial performances are better in the region with a high institutional development level. The compliance speed of institutional practice by firms was faster in the higher level of institutional development. However, the firm's delayed compliance led to better financial performance. Originality/value - Studies in the resource dependence view of Institutional Theory often fall short in understanding the theory by overlooking the firm's active decision-making. Thus, the findings do not present a full scope of corporate performance in this regard. This study not only found a way to test the role of a firm's independent decision-making (i.e., compliance timing) when facing the institutional pressure but also prove the significant role of the compliance timing on corporate performance. Also, we were able to test the effect of institutional development level, controlling location-specific variables because we used CSR performance data for MNEs operating in China. Lastly, by doing the above, the findings of this study suggest practical implications to the industry practitioners in MNEs.