• Journal of Korea Water Resources Association
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• v.55 no.spc1
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• pp.1197-1210
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• 2022

Recently, users' complaints on drinking water quality are increasing according to emerging interest in the drinking water service issues such as pipe aging and various water quality accidents. In the case of drinking water quality complaints, not only the water pollution but also the inconvenience on the chlorine residual for disinfection are included, thus various efforts, such as rechlorination treatment, are being attempted in order to keep the chlorine concentration supplied evenly. In this research, for a more accurate water quality simulation of water distribution network, the water quality reaction coefficients were estimated, and an optimization method of chlorination/ rechlorination scheduling was proposed consideirng satisfaction of water quality standards and chlorine residual equalization. The proposed method was applied to a large-scale real water network, and various chlorination schemes were comparatively analyzed through the grid search algorithm and optimized based on the suitability and uniformity of supplied chlorine residual concentration.

• Asia-pacific Journal of Multimedia Services Convergent with Art, Humanities, and Sociology
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• v.6 no.12
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• pp.533-540
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• 2016

Information Visualization is an information technology to visually represent the data and information by utilizing various tools. Visual information can increase the user's intuitiveness and it can be an effective way that can observe and comprehend the specific information in a short time. Information Visualization, as a research method on Humanities, in the high interest of researchers of Humanities and Area studies, is recently used for collecting base data and analyzing information. As an way to use Information Visualization, various forms of Information Visualization like Electronic Cultural Atlas, Network and Multimedia are actively discussed and studied today. In this paper, Information Visualization will be discussed by utilizing D3, a web-based technology for dynamic visualization. In detail, relationship between the Abbasids of Islam can be visualized by using nodes and connection lines and, this relationship between objects will be analyzed efficiently. Researchers related in this field can use this analyzed information for basis data in their researches.

• Asia-pacific Journal of Multimedia Services Convergent with Art, Humanities, and Sociology
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• v.8 no.3
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• pp.879-886
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• 2018

The basic search engine on Twitter shows not only tweets that contain search keywords, but also all articles written by users with nicknames containing search keywords. Since the tweets unrelated to the search keyword are exposed as search results, it is inconvenient to many users who want to search only tweets that include the keyword. To solve this inconvenience, this study improved the search function of Twitter by developing an algorithm that searches only tweets that contain search keywords. The improved functionality is implemented as a Web service using ASP.NET MVC5 and is available to many users. We used a powerful collection method in C# to retrieve the results of an object, and it was also possible to output them according to the number of 'retweets' or 'favorites'. If the number of retrieved numbers is less than a given number, we also added an exclusion filter function. Thus, sorting search results by the number of retweets or favorites, user can quickly search for opinions that are of interest to many users. It is expected that many users and data analysts will find the developed function convenient to search on Twitter.

• Asia-pacific Journal of Multimedia Services Convergent with Art, Humanities, and Sociology
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• v.8 no.8
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• pp.883-892
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• 2018

Recently, as interest in social robots to support physical convenience and emotional sympathy has increased, and social internet has developed, a social robot has evolved as various services simply beyond robot function. Therefore, to develop a social robot service effectively, it is required to study the functional application and methods of interaction between user and social robot service. The purpose of this study is to classify social robot services and to suggest the types of elements that need to be considered in service development. To do this, we conducted in-depth case studies and analysis based on the theoretical definitions and characteristics of social robots. Then, based on the sympathy and functions, we classified social robot services into 1) emotional support type, 2) companion type, 3) guide type, and 4) life support type. In addition, in this study, we derive the considerable factors according to the classified types for the development of effective social robot services. This study will contribute to the understanding and development of various services using a social robot.

• Design Convergence Study
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• v.14 no.4
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• pp.151-167
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• 2015

This research suggests scenarios of learning in real life contexts with smart devices and provides user interface prototypes to show their characteristics more effectively. For this, literature review was conducted to understand the strength and limitations of current learning in which real life contexts are used. Then, the characteristics of smart devices as a support tool of learning service was reviewed. With such understand, a user research was executed to establish 10 design guidelines for learning service in real life contexts. Finally, this paper suggested two scenarios that shows learning in real life contexts as case studies and their detailed user interface protypes.

• Design Convergence Study
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• v.16 no.1
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• pp.97-109
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• 2017

Interest in the exterior design of buildings has increased in recent years. Demand for various architectural structures is increasing. However, domestic form liner and design are still limited. Thus, this research uses 3D printers to omit the existing mold production process. Use digital data to produce products economically using various materials. It can be hoped that extending the lifespan of the concrete structure will reduce the cost of saving costs. The purpose of this study is to utilize the 3D printers to develop the design of a suitable formative shape for the purposes of the concrete. In this study, 3D printed form enables the possibility that the actual application is practical. Consideration for the artistic design of the art line was proposed for the purpose of considering the use of concrete structures for concrete structures.

• 한국체육학회지인문사회과학편
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• v.57 no.2
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• pp.195-212
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• 2018

O2O stands for 'Online to Offline', which is a new marketing strategy that links online and offline. As consumers' interests in health service has increased recently, sports O2O service is drawing attention from researchers and practitioners as well. For this reason, the purpose of this study is to analyze the empirical relationships of health literacy and innovativeness based on the expectation-confirmation model among users of sports O2O service. For data analyses, frequency analysis, correlation analysis, confirmatory factor analysis, reliability analysis and structural equation modeling were performed using SPSS 21,0 and AMOS 21.0. The results of this study were as follows. First, health literacy had positive effect on usefulness. Second, innovativeness had positive effect on usefulness. Third, confirmation had positive effect on usefulness. Fourth, confirmation had positive effect on satisfaction. Fifth, usefulness had positive effect on satisfaction. Sixth, usefulness had positive effect on intention to use. Seventh, satisfaction had positive effect on intention to use.

• The Journal of the Convergence on Culture Technology
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• v.9 no.3
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• pp.221-237
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• 2023

This study was conducted as part of a phased study aimed at closely examining the mutual ecosystem between creators and viewers through paying attention to the personal media environment that is in the center of rapid changes in the media industry and particularly exploring the areas of activity of the single-person or minority media creators who lead the mobile media environment that could be accessed, viewed and produced anywhere. In particular, this study aimed to not only pay attention to the situation in which the potential to expand professional YouTuber areas encounters the changing desire and demand of content service users who continue to become more evolved as time passes, but also examine the influence of the reputation of professional YouTubers on users' loyalty and subscription intention, examine the moderating effect of sincerity on the relationship between YouTubers and users, and demonstrate such relationship formation process based on concrete data. In the conclusion section, implications that can be drawn from the study results and suggestions for further studies in the future were proposed.

• Proceedings of the Korea Water Resources Association Conference
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• 2022.05a
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• pp.285-285
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• 2022

기후변화가 현실화되면서 수자원평가 (Water Resources Assessment)에 대한 관심과 중요성이 높아지고 있다. 본 연구에서는 '주민공감 문제기획리빙랩' 대상지인 순천은 동천을 중심으로 홍수량을 정량적으로 분석하였다. 순천시의 가장 시급한 사안 중 하나인 범람 및 침수 문제로, 최근 3년(2018~2020)간의 집중호우로 인한 내수배제로 주택 및 도로침수, 산사태 등의 피해를 겪었다. 시기마다 고질적으로 반복되는 동천 인근 지역의 침수문제를 사전에 예방하고 피해의 빈도나 규모를 줄이기 위하여 분석을 수행하였다. 이에 본 연구에서는 환경부의 지원을 받아 한강홍수통제소와 한국건설기술연구원이 공동으로 개발한 동적수자원평가모형(DWAT, Dynamic Water Resources Assessment Tool)을 이용하여 정량적으로 홍수량 산정을 하고자 한다. 본 모형은 전 세계가 무료로 이용할 수 있는 수자원평가도구로 사용자의 편의를 위해 GIS전처리 기능을 포함하고 있어, 자동으로 유역 매개변수 및 면적 평균강우량을 Thiessen method를 사용하여 산정할 수 있다. 또한, 물의 순환과정을 투수 및 불투수지역으로 구분되며, 투수지역은 1개의 토양층과 1개의 불압대수층으로 구성되고, 유출기여역과 함양역으로 유역을 분할하여 적용할 수 있으며, 대수층을 통하여 지하수의 흐름을 산정할 수 있다. 기상청에서 제공하는 기상자료를 분석하여 과거 관측 강우사상 3개를 선정하여 검·보정을 수행하였으며, 그 결과 모형 효율계수(Nash-Sutcliffe efficiency) 및 결정계수(Coefficient of Determination)가 0.78~0.94, 0.82~0.94로 우수한 모의 결과를 산정할 수 있었다. 빈도별 확률강우량을 Huff 4분위법을 사용하여 확률홍수량을 산정하였다. 미래 홍수량 증감량 산정을 위하여 RCP(Representative Concentration Pathways) 기후변화 시나리오를 사용하였다. 관측값과 모의값의 누적확률분포 이용하여 모의값의 확률분포를 관측값의 확률분포에 사상시키는 방법인 분위사상법(Quantile Mapping)을 사용하여 시나리오자료를 보정하였다. 본 연구에서 산정한 홍수량을 바탕으로 침수피해를 막기 위한 구조적 및 비구조적 방안을 위한 기초자료로 사용될 것으로 판단된다.

• Proceedings of the Korea Water Resources Association Conference
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• 2022.05a
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• pp.17-17
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• 2022

현재 하천에서 유량을 측정하는 가장 일반적인 장비는 ADCP(Acoustic Doppler Current Profiler)이다. ADCP는 일정 수심이 확보되는 곳에서는 보트에 장착하여 효율적으로 정확한 유량을 측정하고 있다고 알려져 있다. ADCP의 활용성이 증가함에 따라 측정결과의 신뢰성을 표현하는 방법에 대한 관심이 증가하고 있으며, 프랑스에서는 해외 전문가들을 초청하여 동일한 현장에서 ADCP의 유량을 측정하고 해당 결과를 비교하여 ADCP의 측정정확도에 대한 분석을 수행하고자 하였고, 국내에서도 이와 동일한 방식으로 홍수통제소가 주관하여 국내 유량조사기관들의ADCP를 이용해 장비에 대한 검정과 측정유량에 대한 정확도를 확인하고자 하였다. 해당 방식은 장비들간의 측정결과를 이용하여 이상치를 나타내는 장비에 대해서는 검토가 가능하나, 측정결과에 어떠한 요인들이 측정정확도에 영향을 발생시키는지에 대한 분석을 하기 에는 한계점이 있다. ISO에서는 일반적으로 이루어지는 측정에 대하여 GUM 표준안을 기반으로 하여 측정불확도를 산정하도록 권장하고 있으며, 유량분야의 위원회인 TC 113에서도 GUM을 이용하도록 권장하고 있다(ISO 25377, 2020). 하지만 ADCP를 이용하여 유량을 계산하는 방식이 매우 복잡하고, 이를 GUM에 적용하여 유량측정의 불확도를 산정하기에는 복잡하고 많은 계산식이 필요하기 때문에 이를 계산할 수 있는 도구가 없다면 일반적인 측정자가 불확도를 산정하기에는 한계가 있다. 본 연구에서는 기존에 수행되었던 연구성과들을 종합하여 ADCP의 유량 측정불확도를 산정하는 과정을 프로그램화하고 쉽게 계산할 수 있도록 AQUA(ADCP discharge(Q) Uncertainty Assessment)라는 소프트웨어를 개발하였다. AQUA는 C#을 기반으로 국내에서 일반적으로 사용하고 있는 Sontek사와 TRDI사의 ADCP의 측정결과를 불러올 수 있도록 개발되었다. 해당 소프트웨어를 이용하여 다양한 사용자들이 사용하고 이를 통해 현재 개발된 소프트웨어의 사용성을 보완한다면, 실무에서도 쉽게 ADCP의 측정불확도를 산정할 수 있을 것으로 기대된다.