• 한국비블리아학회지
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• 제33권4호
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• pp.181-205
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• 2022

본 연구의 목적은 국내 Z세대 대학생들의 전자책 이용에 대한 인식을 포함한 독서 행태를 조사하고, 코로나-19로 인한 변화를 알아보기 위함이다. 이를 위해 전국의 대학생들을 대상으로 전자책 인지 및 이용, 전자책 이용현황, 전자책 선호도 인식, 코로나 전후 대학도서관 및 전자책 이용 비교 항목을 조사하였다. 분석 결과, Z세대 대학생들의 전자책 이용에는 대학도서관이 적지 않은 영향을 주고 있었으며, 코로나19는 Z세대 대학생들의 하루 평균 독서 시간에 유의미한 변화를 주는 등 독서 행태에 부분적으로 영향을 미쳤다.

• 동력기계공학회지
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• 제19권1호
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• pp.24-30
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• 2015

Geothermal energy is used in various types, such as power generation, direct use, and geothermal heat pumps. Geothermal energy with high temperature have been used for power generation for more than a century. The purpose of the study is to investigate flow and electricity power characteristics of hydraulic turbine for power generation of geothermal heat pump type with closed-system. The differences between the four types of hydraulic turbine, are different from the blade shape, volume, angle and etc. In case of prototype(1), pressure at blade was reduced to 2.1 bar, the kinetic energy of blade increased by increasing flow velocity(4.1 m/s). The increase of flow velocity at the blade edge markedly appeared, to increase the kinetic energy of the rotating shaft. In case that gateway in hydraulic turbine was installed, operating torque and RPM(1,080) of the rotating shaft increased respectively. Although rotational speed of prototype(2) compared to prototype(1) was reduced, the power generation capacity was greater about 3.4 times to 97 W. The most power of 255W was generated from prototype (4).

• 방사성폐기물학회지
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• 제19권2호
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• pp.267-270
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• 2021

Long-term experiments have been conducted on two important safety issues: long-term durability of a concrete barrier with the steel reinforcements and gas generation from low-and intermediate-level wastes in an underground research tunnel of a radioactive waste disposal facility. The gas generation and microbial communities were monitored from waste packages (200 L and 320 L) containing simulated dry active wastes. In the concrete experiment, corrosion sensors were installed on the steel reinforcements which were embedded 10 cm below the surface of concrete in a concrete mock-up, and groundwater was fed into the mock-up at a pressure of 2.1 bars to accelerate groundwater infiltration. No clear evidence was observed with respect to corrosion initiation of the steel reinforcement for 4 years of operation. This is attributed to the high integrity and low hydraulic conductivity of the concrete. In the gas generation experiment, significant levels of gas generation were not measured for 4 years. These experiments are expected to be conducted for a period of more than 10 years.

• 디지털융복합연구
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• 제20권4호
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• pp.565-573
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• 2022

본 연구는 COVID-19 팬데믹 여파로 생활 속 거리 두기 상황 속에서 해외 미술관들이 고안해낸 여러 비대면 프로그램들에 대한 한국 MZ 세대의 반응과 선호요인을 분석하고자 한다. 대영 박물관을 비롯하여 내셔널갤러리, 폴 게티 미술관, 반 고흐 미술관, 우피치 미술관, 헤이스팅스 컨템포러리, 구겐하임 미술관 등은 창의적이고 시사적인 온라인 프로그램을 통해 폐관기간 동안에도 박물관의 사회적 역할을 이어나가고자 했다. 많은 접속자와 호응으로 주목받은 10개의 프로그램들을 선정하여, 국내에서 뮤지엄 관람이 가장 빈번하고 디지털 활용도가 높은 MZ 세대를 중심으로 설문조사를 실시하여 앞으로 우리나라가 강구해야 할 온라인 프로그램 개발에 방향을 제시하고자 한다. 연구 결과, 기술이 접목된 비대면 관람 방식이 실제 뮤지엄 공간에서 관람하는 느낌을 최대한 구현하는지와, 온라인 전시 콘텐츠에 교육적인 내용이 포함된 것을 선호함을 보여주었다.

• 한국전기전자재료학회논문지
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• 제36권4호
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• pp.403-407
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• 2023

In this paper, in order to investigate the efficiency of solar power generation system operation, we have studied operation cases such as generation amount, utilization rate, and generation time, and the following conclusions were obtained. The amount of power generation in 2017 was 1,311.48 MWh, and the amount of power generation in 2018 was 1,226.03 MWh. In 2021, 1,184.28 MWh was generated, and 90.30% compared to 2017, and the amount of power generation decreased by 1.94% every year. The deterioration of photovoltaic modules could be seen as one cause of the decrease in power generation. 1,977.74 MWh was generated in the spring, and 1,621.77 MWh was generated in the summer. In addition, 1,478.87 MWh was generated in the fall, and 1,110.55 MWh was generated in the winter, showing a lot of power generation in the order of spring, summer, fall, and winter. From 2017 to 2022, the seasonal utilization rate, daily power generation time, and daily power generation were investigated, and it could be seen that the spring utilization rate varies from 19.29% to 16.99%. It could be seen that the daily generation time in winter decreased from 2.67 hours to 2.13 hours, and in spring it generated longer than spring from 4.63 hours to 4.08 hours. In addition, the daily power generation in winter also decreased from 2.67 MWh to 2.13 MWh, and in spring it decreased from 4.63 MWh to 4.08 MWh, but it could be seen that it is more than in winter.

• 한국분무공학회지
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• 제19권4호
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• pp.211-215
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• 2014

The main purpose of this study is to provide basic information of droplet soot generation of decane fuel. To achieve this, this paper presents the experimental results on the decane droplet combustion conducted under various ambient pressure($P_{amb}$), and oxygen concentration($O_2$) conditions. At the same time, the experimental study was conducted in terms of soot volume fraction($f_v$) and its maximum value. Also, visualization of single fuel droplet was conducted by high resolution CCD camera and ambient pressure($P_{amb}$) and oxygen concentration($O_2$) was changed by control system. It was revealed that higher ambient pressure($P_{amb}$), and oxygen concentration($O_2$) enhanced the soot generation and improved the maximum soot volume fraction( $f_v$).

• Journal of information and communication convergence engineering
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• 제19권4호
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• pp.205-213
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• 2021

The properties of a scale-free network are little known; its node degree following a power-law distribution is among its few known properties. By selecting real-field scale-free networks from a network dataset and comparing them to other networks, such as random and non-scale-free networks, the topology characteristics of scale-free networks are identified. The assortative coefficient is identified as a key metric of a scale-free network. It is also identified that most scale-free networks have negative assortative coefficients. Traditional generation models of scale-free networks are evaluated based on the identified topology characteristics. Most representative models, such as BA and Holme&Kim, are not effective in generating real-field scale-free networks. A link-rewiring method is suggested that can control the assortative coefficient while preserving the node degree sequence. Our analysis reveals that it is possible to effectively reproduce the assortative coefficients of real-field scale-free networks through link-rewiring.

• 한국응용곤충학회지
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• 제16권1호
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• pp.13-19
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• 1977

줄무늬 잎마름병의 매개와 직접 관계가 있는 월동세대부터 제3세대까지의 애멸구의 세대별 증식상황을 기주식물의 종류 및 생육상태와 관련시켜 Pot시험과 유균사육을 하여 다으과 같은 결과를 얻었다. 1. 월동세대, 맥류에서 우화한 제1세대, 벼에서의 제2세대 성충의 평균 수명은 13.4일, 12.9일, 10.2일로 사료교환시의 간섭으로 정상성충의 수명에 비하여 짧아졌으나 세대별 차는 적은 것으로 생각된다. 2. 월동세대, 제1세대, 그리고 제2세대 성충의 유묘상에서의 평균산란수는 각각 131.3, 124.9 그리고 142.3으로 큰 차가 없었으며 대체로 3주 이내에 전체의 $90\%$ 이상이 산란되었다. 3. 부화율은 유묘상에서 제1세대가 $77.4\%$, 제2세대가 $93.1\%$였으나 pot 실험에서 정추란수에 의한 부화율은 제1세대 $67.5\%$, 제2세대 $84.1\%$ 제3세대 $21.9\%$ 등으로 현저한 차가 있으며 보리에서 5월 17일 늦게 접종한 것에서는 란수에는 큰 차가 없었으나 부화율은 $13.5\%$로 5월 1일 이전 접종시의 $67.5\%$에 비하여 극히 낮았다. 4. 약충기간은 제1세대 19.4일, 제2세대 13.3일이었고 약충기간중의 치사율은 기주식물의 생육상태에 따라 차가 있는 듯 하였다. 5. Pot시험에서의 평균우화수는 제1세대 $37.2\%$, 제2세대 $55.3\%$, 제3세대 $11.6\%$으로 세대간차가 심하였으며 보리에서 5월 17일 접종구의 평균성충수가 $7.4\%$였음을 생각할 때 기주의 생리적 조건과 밀접한 관계가 있는 것으로 생각된다. 6. 이상으로 보아 애멸구의 선천적 증식능에는 세대간차가 없는 것으로 생각되며 기주의 생리적 조건은 기상적 조건이나 천적과 아울러 밀도변동에 밀접한 관계가 있으며 애멸구의 강한 이동성도 이와 같은 점과 유관한 것으로 추측된다.

• 대한안전경영과학회지
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• 제19권4호
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• pp.157-167
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• 2017

Solar energy has been known as a successful alternative energy source, however it requires a large area to build power generation facilities compared to other energy sources such as nuclear power. Weather factors such as rainy weather or night time impact on solar power generation because of lack of insolation and sunshine. In addition, solar power generation is vulnerable to external elements such as changes in temperature and fine dust. There are four seasons in the Republic of Korea hereby variations of temperature, insolation and sunshine are broad. Currently factors that cause find dust are continuously flowing in to Korea from abroad. In order to build a solar power plant, a large area is required for a limited domestic land hereby selecting the optimal location for the plant that maximizes the efficiency of power generation is necessary. Therefore, this research analyze the optimal site for solar power generation plant by implementing analytic hierarchy process based on weather factors such as fine dust. In order to extract weather factors that impact on solar power generation, this work conducts a case study which includes a correlation analysis between weather information and power generation.

• 한국의류산업학회지
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• 제24권1호
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• pp.81-94
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• 2022

The purpose of this study is to analyze the trends of MZ generation's lifestyle-related research from 2010 to 2020. As a result of searching keywords such as MZ generation's and lifestyle using academic database search sites, a total of 218 cases were used as analysis data to conduct frequency and content analysis. First, research type was 74 dissertations(34.6%), 144 journals(65.4%). The study of MZ generation was relatively active in journals. Second, the current status of academic field was 85(39.7%) in the social field, followed by 66(30.8%) in the arts/physical education, 21(9.8%) in the complex studies, 16(7.5%) in education, 15(7.0%) in nature, 6(2.8%) in engineering, 4(1.9%) in humanities, 1(0.5%) in agriculture/marine. Third, the current status of MZ generation research topics is 54 social participations(25.3%), 35 fashion/beauty(16.3%), 31 social/organizational adaptations(14.5%), 25 cultural/leisure activities(11.7%), 24 design/development projects(11.2%), 21 economic/employment/job projects(9.8%), 11 educational/career/experiences(5.1%), 9 self-concepts(4.2%), 4 welfare services(1.9%). Fourth, the current status of MZ generation research methods was quantitative research(survey/experiment) 125(58.4%), qualitative research(depth interview/participant observation) 42(19.6%), theory/literature research 35(16.4%) and mixed research 12(5.6%). Fifth, the study on the lifestyle of the MZ generation was conducted in four cases, one in 2016, one in 2019, two in 2020. This study is meaningful in that it grasped the overall flow of data of information exchange that can share the research trends of the MZ generation and suggested the basic data on the direction of future research, the individual tendency, behavior, and lifestyle characteristics of the MZ generation.