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랜덤포레스트를 이용한 낙동강 본류의 남조류 발생 영향인자 분석
정우석(Jung, Woo Suk),김성은(Kim, Sung Eun),김영도(Kim, Young Do) 한국습지학회 2021 한국습지학회지 Vol.23 No.1
본 연구에서는 랜덤포레스트를 이용하여 8개 보 지점별 남조류 발생 주요 영향인자를 도출하고, 조류경보제 기반의범주형 예측모델을 개발하였다. 8개 보 지점의 랜덤포레스트의 변수 중요도를 살펴본 결과, 상류의 보 지점들은 남조류 발생에 있어 보 운영에 따른 영향을 직접적으로 받는 것으로 나타났다. 이는 효율적인 보 운영을 통한 남조류 관리가 가능할 수 있다는 것을 의미한다. 중류 구간은 DO와 E.C가 주요 영향인자로 도출되었다. 공간적으로 구미와 김천에 대규모 산업공단들이 밀집되어 있으며, 환경기초시설의 배출량이 큰 영향을 끼치는 구간이다. 따라서 폭염 및 가뭄 시기에 중류 유역에서 배출되는 환경기초시설의 방류는 본류의 E.C를 증가하게 하고 남조류 발생을 촉진 시키는것으로 나타났다. 중·하류에 위치한 보 지점들은 폭염 및 가뭄의 영향을 가장 많이 받는 지역으로 여름철 가뭄에 따른남조류 대발생에 대비하여 선제적인 관리가 필요한 지점으로 나타났다. 본 연구를 통해 지점별 남조류 발생 영향인자를 도출하였으며, 맞춤형 조류관리를 위한 정책적 의사결정의 기초자료로 제공될 수 있을 것으로 판단된다. In this study, the main influencing factors of the occurrence of cyanobacteria at each of the eight Multifunctional weirs were derived using a random forest, and a categorical prediction model based on a Algal bloom warning system was developed. As a result of examining the importance of variables in the random forest, it was found that the upstream points were directly affected by weir operation during the occurrence of cyanobacteria. This means that cyanobacteria can be managed through efficient security management. DO and E.C were indicated as major influencers in midstream. The midstream section is a section where large-scale industrial complexes such as Gumi and Gimcheon are concentrated as well as the emissions of basic environmental facilities have a great influence. During the period of heatwave and drought, E.C increases along with the discharge of environmental facilities discharged from the basin, which promotes the outbreak of cyanobacteria. Those monitoring sites located in the middle and lower streams are areas that are most affected by heat waves and droughts, and therefore require preemptive management in preparation for the outbreak of cyanobacteria caused by drought in summer. Through this study, the characteristics of cyanobacteria at each point were analyzed. It can provide basic data for policy decision-making for customized cyanobacteria management
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김영도(Kim Young Do),박재현(Park Jae Hyeon),손병주(Son Byung Ju) 대한토목학회 2011 대한토목학회논문집 B Vol.31 No.6B
저수지내에서의 탁수층의 혼합거동은 연중 온도변화에 영향을 받으며 특히 여름철에 발생하는 한 개 내지 두 개의 수온약층과 이에 따라 밀도가 다론 연직층 분포에 의해 변화한다. 이와 같은 밀도성층은 연직방향의 혼합을 제한하고 저수지내에서 다양한 수리학적인 거동을 야기한다. 따라서 저수지내에서는 특정 수질 문제를 해결하기 위해 선택취수를 수행할 수 있다. 본 연구에서는 이와 같은 선택취수의 효율을 해석하기 위하여 성층흐름의 수리학적 특성에 관한 실험연구를 수행하였다. two-tank 기법을 이용한 성층수조에서 밀도경사와 유량을 변수로 한 각 조건별 취수구 주변의 수리학적 특성을 입자영상유속계(PIV)를 이용하여 측정하였다. 측정된 유속장을 이용하여 Richardson 수에 따른 선택취수의 효율에 대한 상관관계를 제시하였다. The mixing behavior of turbidity currents in a reservoir is closely related with the annual temperature change of the reservoir. In the summer the reservoir has a well defined structure: one or two thermoclines and some layers of different densities. This density stratification inhibits vertical mixing and affects various hydrodynamic processes within the reservoir. Therefore many reservoirs can be operated to release water of the specific quality with the selective withdrawal. In this study the hydraulic experiments were performed to analyze the efficiency of selective withdrawal. The velocity distributions are measured with PIV in the stratified lank with the "two-tank" method. The relationship between the Richardson number and the selective withdrawal efficiency are provided using the measured velocity distributions.
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김영도(Young-Do Kim),한태우(Tae-Woo Han) 한국엔터테인먼트산업학회 2009 한국엔터테인먼트산업학회논문지 Vol.3 No.3
This study was progressed as follows : Chapter 1 described the background, purpose, range and method of research. Chapter 2 investigated the conceptual definition of exhibition through the new trend in the exhibition communication and exhibition producing. Chapter 3 identified the definition and application of storytelling, analyzed the convergence point of storytelling and exhibition producing. Chapter 4 presented the case of exhibition producing by storytelling and exhibition concept. Chapter 5, the concluding remarks, emphasized the new possibility of exhibition producing by the spectator and storytelling thus far presented through the process of research.
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김영도 ( Young Do Kim ),정현석 ( Hyun-seok Jeong ) 한국금융연구원 2018 금융연구 Vol.32 No.3
In 2016, the equity-type crowdfunding was introduced and institutionalized in Korea as a major fund-raising tool for innovative start-ups. Equity-type crowdfunding is where a company offers and issues securities for financing via an online platform, and many small investors come to invest in them. In fact, since crowdfunding makes it possible for start-ups to raise fund from the public based on their future growth potential rather than past performance, it could be a major funding source for domestic venture and startup companies. Also, crowdfunding could be a first step in creating a healthy venture and entrepreneurial eco-system, playing a pivotal role as start-ups supporting system. Over the past two years as of the institutionalization of equity-type crowdfunding in Korea, it has seen remarkable growth. In terms of investors, the number of participating investors are growing rapidly. Also, the growth is expected to continue for a time being as policy authority has plans to deregulate regulations regarding equity-based crowdfunding by expanding investment limits, for instance. In particular, the current Korean government policy stance to promote the naissance and development of early innovators is expected to greatly contribute to the revitalization of equity-type crowdfunding. All these given, this study examines whether the characteristics of a firm have been a variable for the success of crowdfunding conducted over the last two years. Then, this study also examines whether the success of crowdfunding affects the performance of the firm. In this paper, we present several meaningful findings. First, there were no clear evidence in difference of financial characteristics between the successful and failed firms. Since crowdfunding is a system that assesses the future of corporations or projects rather than their past performance, it seems that some of the initial intention of Korea's equity-type crowdfunding’s introduction is taking place. In addition, this study analyzes whether firms’ financial indices in financial statements are improved after crowdfunding compared to those firms which failed to procure. We suggest that there were some positive impacts on companies that were successful in funding, as a whole. Specifically, the size of firms with successful crowdfundings are growing, and their sales activities are also significantly improving. Yet, the impact of crowdfunding on substantial corporate performance is still ambiguous with a few exceptions. However, this ambiguity could be coming from the fact that crowdfunding is still at an early stage. Therefore, we think that future discussion needs to be focused on long-term achievements rather than recent short-term results. In the future, if further policy measures on equity-type crowdfunding are considered in a way to improve funding condition of start-ups and SMEs, it is necessary to promote the support measures of crowdfunding. However, future discussion for crowdfunding support measures should look a step further from just making the funding itself successful: Crowdfunding should be a supporting system for the efficient use of funding for firms’ internal innovation, growth and ultimately commercialization, and so on.
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신화적 의미작용을 통한 새만금과 군산의 연계 관광콘텐츠 개발 방향에 대한 탐색적 연구
김영도(Young-Do Kim) 한국엔터테인먼트산업학회 2015 한국엔터테인먼트산업학회논문지 Vol.9 No.3
Saemangeum has positive aspects such as the Great Wall of China in the sea. And it has negative aspects of the destruction of ecosystems in the binary opposition. Gunsan adjacent to the Saemangeum also has positive and negative aspects like the Saemangeum at the same time. Gunsan is pushing urban development project of the modern culture by utilizing historic architectures which have implied the national injury of the Japanese colonial period. There are oppositional claims using it as a commercial object and positive impact to invigorate the regional economy on this projects. Thus Saemangeum and Gunsan has the contacts to be linked in a similar context in a double-edged sword. Therefore, this paper focuses on the development direction of tourism contents to eliminate the negative aspects appearing during the development of Saemangeum and Gunsan. First, it compares different views on the various meanings of myth. And it also looks at the mythical signification and the ladder of abstraction precisely. Based on this theory, this paper captures the placeness and spatial paradigm of Saemangeum and Gunsan. In addition, this article investigates the development direction of tourism contents oriented based on the concept of Jumping With Saemangeum. Therefore, this study will contribute substantially to the development direction of the Saemangeum and Gunsan.
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