• 상하수도학회지
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• 제29권3호
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• pp.293-303
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• 2015

Optimal design of the water supply pipe network aims to minimize construction cost while satisfying the required hydraulic constraints such as the minimum and maximum pressures, and velocity. Since considering one single design factor (i.e., cost) is very vulnerable for including future conditions and cannot satisfy operator's needs, various design factors should be considered. Hence, this study presents three kinds of design factors (i.e., minimizing construction cost, maximizing reliability, and surplus head) to perform multi-objective optimization design. Harmony Search (HS) Algorithm is used as an optimization technique. As well-known benchmark networks, Hanoi network and Gyeonggi-do P city real world network are used to verify the applicability of the proposed model. In addition, the proposed multi-objective model is also applied to a real water distribution networks and the optimization results were statistically analyzed. The results of the optimal design for the benchmark and real networks indicated much better performance compared to those of existing designs and the other approach (i.e., Genetic Algorithm) in terms of cost and reliability, cost, and surplus head. As a result, this study is expected to contribute for the efficient design of water distribution networks.

• 한국IT서비스학회지
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• 제16권1호
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• pp.139-162
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• 2017

Museums contain a significant meaning as a place that reflects empirical knowledge that have been accumulated socially and scientifically in overall life of the public and provides the opportunity to enjoy prestigious culture, while serving as the extended place of education. The first objective of this study is to increase the accessibility of general public through the development of online museum programs as service contents and to present the ultimate direction the development of in art appreciation contents that can effectively expand the infrastructure of culture and art. Second, the effectiveness of online art appreciation programs by registered private museums, which continuously develop smart media-based online museum contents and systemization of archive as the distribution rate of smart devices is increased due to generalization of digital environments, was analyzed by each case to examine the objective distinctions strategies. Third, in terms of museum visitors and smart contents users, this study examines the expected effects of popular distribution by seeking various ways that can enhance the desired exhibit appreciation and autonomous utilization of educational programs, while not being restricted by the physical accessibility and limitation of space at the museums. The subjects of this study included cases of BoroomSan Museum, Savina Museum of Contemporary Art, Imageroot, Sangwon Museum of Art, Hello Museum, etc. and the online smarts contents art appreciation educational programs by registered private museums were analyzed. Results expected to achieve from such processes are as follows. First, the possibility to expand cultural participation in museum exhibition appreciation and museum education infrastructure became widen. Second, the educational program resources can be utilized as the culture and art asset that strengthens the museums' responsibilities in their social role. Third, museum archive can be constructed in more systematic way, and the efficiency of museum archive system can be enhanced to maintain the museum collection database in a consistent format. Fourth, the museum's smart contents users' continued access to museum's online contents may induce the exhibition effect of the site and voluntary participation in education, and can also expect an economic synergy effect as the users become potential visitors that may actually visit the museum in the future.

• 한국농공학회논문집
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• 제61권4호
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• pp.1-10
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• 2019

Unmanned aerial vehicle(UAV) can acquire images with lower cost than conventional manned aircraft and commercial satellites. It has the advantage of acquiring high-resolution aerial images covering in the field area more than 50 ha. The purposes of this study is to develop the rice grain yield distribution using UAV. In order to develop a technology for estimating the rice yield using UAV images, time series UAV aerial images were taken at the paddy fields and the data were compared with the rice yield of the harvesting area for two rice varieties(Singdongjin, Dongjinchal). Correlations between the vegetation indices and rice yield were ranged from 0.8 to 0.95 in booting period. Accordingly, rice yield was estimated using UAV-derived vegetation indices($R^2=0.70$ in Sindongjin, $R^2=0.92$ in Donjinchal). It means that the rice yield estimation using UAV imagery can provide less cost and higher accuracy than other methods using combine with yield monitoring system and satellite imagery. In the future, it will be necessary to study a variety of information convergence and integration systems such as image, weather, and soil for efficient use of these information, along with research on preparing management practice work standards such as pest control and nutrient use based on UAV image information.

• 한국군사과학기술학회지
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• 제24권1호
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• pp.50-60
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• 2021

For conventional AESA radars, DC-DC power modules using 300 Vdc have low efficiency, high volume, heavy weight, and high price, which have problems in modularity with T/R module groups. In this paper, to improve these problems, we propose a distributed DC-DC power module with high-voltage 800 Vdc and high-efficiency Step-down Converter. In particular, power requirements for modern and future marine weapons systems and sensors are rapidly evolving into high-energy and high-voltage power systems. The power distribution of the next generation Navy AESA radar antenna is under development with 1000 Vdc. In this paper, the proposed highvoltage, high-efficiency DC-DC power modules increase space(size), weight, power and cooling(SWaP-C) margins, reduce integration costs/risk, and reduce maintenance costs. Reduced system weight and higher reliability are achieved in navy and ground AESA systems. In addition, the proposed architecture will be easier to scale with larger shipboard radars and applicable to other platforms.

• International Journal of Computer Science & Network Security
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• 제21권4호
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• pp.255-263
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• 2021

Smart grid is a fully-automated, bi-directional, power transmission network based on the physical grid system, which combines sensor measurement, computer, information communication, and automatic control technology. Blockchain technology, with its security features, can be integrated with Smart Grids to provide secure and efficient power management and transmission. This paper dicusses the deployment of Blockchain technology in Smart Grid. It presents application areas and protocols in which blockchain can be applied to in securing smart grid. One application of each area is explored in detail, such as efficient peer-to-peer transaction, lower platform costs, faster processes, greater flexibility in power generation to transmission, distribution and power consumption in different energy storage systems, current barriers obstructing the implementation of blockchain applications with some level of maturity in financial services but concepts only in energy and other sectors. Wide range of energy applications suggesting a suitable blockchain architecture in smart grid operations, a sample block structure and the potential blockchain technicalities employed in it. Also, added with efficient data aggregation schemes based on the blockchain technology to overcome the challenges related to privacy and security in the smart grid. Later on, consensus algorithms and protocols are discussed. Monitoring of the usage and statistics of energy distribution systems that can also be used to remotely control energy flow to a particular area. Further, the discussion on the blockchain-based frameworks that helps in the diagnosis and maintenance of smart grid equipment. We have also discussed several commercial implementations of blockchain in the smart grid. Finally, various challenges have been discussed for integrating these technologies. Overall, it can be said at the present point in time that blockchain technology certainly shows a lot of potentials from a customer perspective too and should be further developed by market participants. The approaches seen thus far may have a disruptive effect in the future and might require additional regulatory intervention in an already tightly regulated energy market. If blockchains are to deliver benefits for consumers (whether as consumers or prosumers of energy), a strong focus on consumer issues will be needed.

• 상하수도학회지
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• 제35권6호
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• pp.389-403
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• 2021

In this study, dual drainage system based runoff model was established for W-drainage area in G-si, and considering the various rainfall characteristics determined using Huff and Mononobe methods, the degree of flooding in the target area was analyzed and the risk was compared and analyzed through the risk matrix method. As a result, the Monobe method compared to the Huff method was analyzed to be suitable analysis for flooding of recent heavy rain, and the validity of the dynamic risk assessment considering the weight of the occurrence probability as the return period was verified through the risk matrix-based analysis. However, since the definition and estimating criteria of the flood risk matrix proposed in this study are based on the return period for extreme rainfall and the depth of flooding according to the results of applying the dual drainage model, there is a limitation in that it is difficult to consider the main factors which are direct impact on inland flooding such as city maintenance and life protection functions. In the future, if various factors affecting inland flood damage are reflected in addition to the amount of flood damage, the flood risk matrix concept proposed in this study can be used as basic information for preparation and prevention of inland flooding, as well as it is judged that it can be considered as a major evaluation item in the selection of the priority management area for sewage maintenance for countermeasures against inland flooding.

• 산업융합연구
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• 제21권1호
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• pp.167-173
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• 2023

경제지표를 분석하는 방법으로 회귀 분석이나, 인공지능을 활용하여 미래의 데이터를 예측하는 연구가 발표되었다. 본 연구에서는 토픽모델링을 사용하여 과거 뉴스 기사로부터 얻은 주제 확률 데이터를 이용한 인공지능으로 미래 선물 가격을 예측하는 시스템을 구상하였다. 과거 뉴스 기사로부터 비지도학습을 통한 문서의 주제를 추출할 수 있는 LDA 방법으로 각 뉴스 기사 주제 확률 분포 데이터를 얻을 수 있고, 해당 데이터를 인공지능의 RNN의 파생 구조인 LSTM의 입력 데이터로 활용함으로써 미래 선물 가격을 예측하였다. 본 연구에서 제안한 방법에서는 선물 가격의 추세를 예측할 수 있었고, 이를 활용하여 추후 옵션 상품 등의 파생 상품에 대한 가격 추세도 예측할 수 있을 것으로 보인다. 다만, 일부 데이터에 대해 오차가 발생하는 것이 확인되어 정확도 향상을 위한 추가적인 연구가 필요하다.

• 한국환경농학회지
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• 제41권1호
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• pp.9-15
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• 2022

BACKGROUND: Heavy metals discharged from various sources contaminate the soil and water and the residuals can persistently be accumulated. In this study, the concentration of soil heavy metals was assessed over the whole regions of Korea based on the contamination factor and the geoaccumulation index. METHODS AND RESULTS: The data of averaged concentrations of heavy metals and fluorine were collected from the Korean Statistical Information Service (KOSIS) and the research papers published. In order to classify the levels of heavy metal concentration, the contamination index, including the contamination factor and the geoaccumulation index, based on the relative ratio of the actual concentration of heavy metals in the soil to the background concentration was calculated. In addition, the distribution of heavy metals in soils was visualized by using the geographic information system (GIS). As a result, the Cd contamination in the soils was the most concerned. CONCLUSION(S): This study very roughly indicated the outline of heavy metal concentration over the whole regions of Korea. The change in heavy metals' concentration over the time should further be monitored and the larger data of heavy metal contamination are needed for better understanding in the future.

• 한국콘텐츠학회논문지
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• 제22권5호
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• pp.247-260
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• 2022

본 연구는 출판문화산업 활성화를 위해 도서자판기를 편의점에 설치하여 유통채널을 확장시키는 방안에 관한 연구이다. 먼저 편의점의 의미와 도서자판기의 개념을 정립한 후 편의점 내 도서자판기 설치 및 운영 필요성을 도출하였다. 편의점 시스템을 이용하여 도서판매의 공정성과 투명성을 제고할 것이며, 출판업계와 편의점업계 사이의 아웃소싱, 소비자를 위한 옴니채널 서비스 확대, 고객 만족도를 높이기 위한 고객 경험가치 제공 등을 추진할 것이다. 도서자판기의 구성은 스마트 도서관 형태의 자판기로 운영하며 키오스크 프로그램에 유니버설 디자인을 적용한다. 이러한 과정을 도식화하였고 실질적인 운영방안을 모색하기 위해 성인 310명을 대상으로 설문조사를 시행하였다. 향후 편의점 도서자판기 설치와 같이 출판물의 판매 및 유통채널을 다변화하는 연구를 통해 출판문화산업 활성화에 따른 국민 1인당 독서량 증가로 국민의 독서환경이 증진될 수 있기를 기대하는 바이다.

• 벤처창업연구
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• 제7권2호
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• pp.157-165
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• 2012

프랜차이즈는 사업경험과 지식이 없어도 독자적이고 성공적인 브랜드의 상호 및 상표, 마케팅기술과 노하우의 활용, 점포 운영을 위해 필요한 경영 및 마케팅의 지원을 받아 안정적인 창업 준비와 성공적인 사업을 영위할 수 있는 하나의 창업방법이다. 이러한 프랜차이즈는 법률적으로 독립적인 두 당사자인 가맹본부와 가맹점 사업자, 생산자로 부터 소비자에게 상품 및 용역을 유통시키는 기업 활동이라는 마케팅 개념과 상품을 사람에게 전달하는 유통의 개념 측면을 포함하는 종합적인 사업방식이다. 가맹본부는 자신의 사업방법의 공급, 상표와 특허를 자신의 관리 아래 다른 사람들이 사용하도록 허용하는 법률적 존재를 말하며, 생산자가 되기도 하고, 중간도매상이 되기도 한다. 그리고 가맹점 사업자는 가맹본부나 프랜차이즈 기업과의 합의에 의해 사업을 운영하는 개인 또는 개인들로 상표나 상호를 사용하고, 상품이나 서비스를 거래 하거나 판매하며, 경영지원이나 훈련을 지원 받고, 마케팅 및 광고 지원을 받으며, 프랜차이저의 브랜드 및 인지도의 혜택을 받는다. 따라서 가맹점사업자는 프랜차이즈로부터 상호의 사용권, 제품의 판매권, 기술, 상권분석, 점포 디스플레이, 관계자 훈련 및 교육지도 등을 제공받아 소비자에게 상품이나 용역을 유통시키거나 전달하는 소매상이라고 할 수 있을 것이다. 이러한 양자 관계에서 가맹점은 가맹점 본부에 대해 불공정성을 인지하는 경우가 존재한다. 이에 대해 본 논문에서는 가맹본부의 관리적 특성이 양자관계에서의 공정성에 미치는 효과를 실증분석하고자 하였다. 가맹점본부와 가맹점과의 관계에서 본부의 관리적 특성으로서 의사소통, 메뉴개발, 보상은 모두 분배공정성과 절차공정성에 긍정적 영향을 미치는 것으로 나타났다. 이상의 연구결과를 바탕으로 다음과 같은 관리적 시사점을 제시하고자 한다. 따라서 가맹점주들로 하여금 본부에 대한 분배공정성과 절차공정성에 대한 인지도를 높이기 위해서는 본부의 가맹점에 대한 투자, 시설 및 인테리어나 비품지원, 법률적 지원, 판촉 및 교육 지원, 그리고 본부와 가맹점간의 원활한 의사소통 및 정보 공유, 다양하고도 적시의 메뉴개발, 가맹점의 서비스향상이나 고객문제해결에 따른 보상 시스템 등을 제공하는 것이 필요하다.