• 디지털산업정보학회논문지
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• 제14권4호
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• pp.205-218
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• 2018

The purpose of this study is to examine the factors that the characteristics of Protection Motivation Theory affects the addiction of social game users in Korea and then, to verify how these factors make an impact on the addiction through the immersion. The characteristics of protection motivation theory are vulnerability, severity, efficiency, and disability, and we want to study the influence of each characteristic on social game flow and the relationship leading to addiction. The results of this research can be useful for 'social game addiction prevention education'. This study was conducted to survey the users who had experienced using the social game to verify the suggested hypothesis. As the results of the survey, first of all, vulnerability appeared to have a positive effect on the flow. Secondly, severity appeared not to have a positive impact on the flow. Thirdly, efficiency turned out to affect the flow. Fourthly, disability turned out to have a positive impact upon the flow. Lastly, flow was revealed to make a positive impact on the addiction. The results of this study will help to construct the content of 'social game addiction prevention education program'.

• 대한한의학회지
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• 제44권1호
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• pp.56-64
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• 2023

Objectives & Methods: The entire ≪Lingshu·Jingjin≫ content was analyzed to find repetitive patterns, as well as to analyze commonly used terms. Through this, the guidelines for interpretation were presented. Results & Conclusions: ≪Lingshu·Jingjin≫ is not a question-and-answer format, but a simple enumerated narrative format. There is no part corresponding to the introduction, only the descriptions of 12 individual Meridian-muscle exist. Each Meridian-muscle is divided into 'Flow of Muscle Mechanics(流走)' part and 'Diseases' part, and 'Flow of Muscle Mechanics' of each Meridian-muscle can be divided into 'Main Flow' and 'Branch'. 'Main Flow' is the most central 'Flow' in each 'Meridian-muscle', and 'Branch' is the part where 'Main Flow' ends and the description of another 'Flow' begins. 'Branch' has different expressions according to the importance. The expression also varies depending on the dynamics. 'Meridian-muscle' should be interpreted based on this.

• 한국도로학회논문집
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• 제15권2호
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• pp.73-81
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• 2013

PURPOSES : In this study, various laboratory tests were performed to investigate basic physical properties of the asphalt concrete which uses wasted vinyl aggregates. METHODS : The thermal conductivity, ultrasonic velocity, Marshall stability, flow, indirect tensile strength were measured according to binder content and wasted vinyl aggregate content. An experimental construction was performed to verify construct ability of the asphalt pavement using the wasted vinyl aggregates. RESULTS : The thermal conductivity and ultrasonic velocity decreased showing insulation effect by mixing more wasted vinyl aggregate, whereas stability and flow increased. The void ratio shows similar value regardless of the mixing ratio. The highest indirect tensile strength was measured at 2.5% of wasted vinyl aggregate content. The construct ability was verified by observing the process of mixing, placing, and compaction and the state of the pavement surface. CONCLUSIONS : The basic properties and construct ability of the asphalt concrete using the wasted vinyl aggregates were verified. The temperature according to pavement depth will be measured to verify the insulation effect of the wasted vinyl aggregates. In addition, amount of snowfall, snowmelt area, and ice adhesion strength will be analyzed quantitively.

• 한국세라믹학회지
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• 제50권5호
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• pp.341-347
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• 2013

Kaolin-based membranes with a pore size of 0.30-0.40 ${\mu}m$ were successfully prepared by a simple pressing route using low-cost starting materials, kaolin and sodium borate. The prepared green bodies were sintered at different temperatures ranging between 900 and $1200^{\circ}C$. The sintered membranes were characterized by X-ray diffraction, mercury porosimetry, scanning electron microscopy, and capillary flowmetry. It was observed that the porosity decreased with an increase in both the sintering temperature and the sodium borate content, whereas the flexural strength increased with an increase in both the sintering temperature and the sodium borate content. The air flow rate decreased with an increase in the sodium borate content. The typical porosity, flexural strength, and specific flow rate of the kaolin-based membrane sintered with 5 wt% sodium borate at $1100^{\circ}C$ were 37%, 19 MPa, and $1{\times}10^{-3}L/min/cm^2$, respectively, at a p of 30 psi.

• 한국축산시설환경학회지
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• 제22권1호
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• pp.35-44
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• 2016

This study was conducted to establish a database of high solid manure(HSM) in domestic. Theoretical methane potential and HSM characteristics was evaluated using breef and dairy manure (n=156). Total solids and Volatile solids of HSM increased depending on time flow, the results showed $20.4{\pm}3.2$ and $17.4{\pm}2.8%$. respectively. C/N ratio of breef HSM was higher than dairy HSM C/N ratio. In theoretical methane potential, the result of breef and dairy HSM was showed $505.2{\pm}25.3$ and $493.5{\pm}20.2$, respectively. Nitrogen content of total HSM increased depending on time flow, the result of breef and dairy nitrogen content was showed $1.9{\pm}0.3$ and $2.8{\pm}0.2$, respectively. Carbon content of total HSM showed approximately 10% reduction. The optimal time of bed replacement was indicated between 29 amd 31 days based on the optimal C/N ratio. Therefore, this study was considered that it has high utilization for livestock manure recycling and basis of relevant research.

• 한국게임학회 논문지
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• 제19권5호
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• pp.115-132
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• 2019

본 연구는 기술수용모델을 이용하여 VR콘텐츠의 지각된 재미가 재이용 의도에 미치는 요인을 분석하였다. 지각된 재미의 요인은 콘텐츠 품질, VR특성, 감정적 특성, 몰입 네 가지로 설정하여 검증하였으며, 연구 결과 VR특성, 감정적 특성, 몰입은 지각된 재미에 긍정적 영향을 주지만, 콘텐츠의 고품질 요인은 지각된 재미에 영향을 미치지 않는다는 사실이 입증되었다. 또한 지각된 재미, 지각된 유용성, 지각된 용이성 모두는 재이용 의도에 영향을 미치고 있는 것으로 나타났으며, 콘텐츠의 지각된 재미가 지각된 유용성에 긍정적인 영향을 미치는 것으로 분석되었다.

• 한국압력기기공학회 논문집
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• 제12권2호
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• pp.40-49
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• 2016

Flow accelerated corrosion (FAC) of the carbon steel piping has been a significant problem in nuclear power plants. FAC occurs under certain hydrodynamic, environmental, and material conditions, and extensive research into the factors of FAC has been conducted. The basic process of FAC is now relatively well understood; however, a full mechanistic model has not yet been established. Recently, the Korea Atomic Energy Research Institute (KAERI) has built a large experiment loop system for FAC. To produce significant experimental results using this system, the factors affecting on FAC should be analyzed quantitatively, and a model needs to be developed. In this work, a statistical modeling methodology to develop an empirical model is described in detail, and a preliminary model is suggested. Firstly, FAC data were collected from the research literature in Japan and the results of domestic experiments. The flow rate, water temperature, pH at room temperature, and the Cr content are selected as major factors, and nonlinear regression is used to find the best fit of the available data. An iterative procedure between suggesting and evaluating a model is used until an optimum model is obtained. The developed model gives the FAC rate comparable to the measured FAC rate. The developed model is going to be refined using additional laboratory data in the future.

• Reproductive and Developmental Biology
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• 제36권1호
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• pp.1-6
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• 2012

This study evaluated a sexed sperm ability to produce embryos by flow cytometer. Hanwoo bulls sperm were separated to X and Y sperm via Hoechst 33342 stained with near UV laser or performed the pre-sorted without near UV laser beam in flow cytometry. Pre-sorted sperm had significantly higher viability ($84{\pm}1.15%$, $p$<0.05) compared to other sorted groups in frozen-thawed semen. For fresh semen, pre-sorted sperm had the higher viability ($79{\pm}3%$, $p$<0.05) than those of the X and Y sperm ($44.7{\pm}1.67$ and $41.7{\pm}1.2%$) separated by differences of DNA content. On the other hand, pre-sorted and X sperm sorted according to differences in DNA content had significantly higher viabilities ($24.3{\pm}1.2$ and $25.7{\pm}0.9%$, $p$<0.05) compared to that of the sorted Y sperm ($13.7{\pm}1.2%$) in the hypoosmotic swelling test. The proportion acrosome reaction in the sorted X sperm was higher ($55.0{\pm}1.7$ and $45.0{\pm}1.5%$) than those of the sorted Y-sperm ($32.3{\pm}0.9%$, $p$<0.05). However, the sperm morphologies of the sorted groups were not significantly differences. In conclusion, the sex-sorting procedure by flow cytometry affected some characteristics of Hanwoo sperm. Further study is needed to determine the optimal procedures to enhance male and female embryos and sorting accuracy.

• 콘크리트학회논문집
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• 제25권3호
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• pp.305-312
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• 2013

이 연구는 물-결합재(W/B) 비에 따른 실리카 퓸이 알칼리 활성화 슬래그 시멘트(AASC)에 미치는 유동성과 강도 특성에 대한 연구이다. W/B비는 0.50에서 0.60까지 0.05 단위로 일정하게 변화시켰다. 실리카 퓸은 고로슬래그 중량의 0%에서 50%까지 치환시켰다. 활성화제는 수산화나트륨(NaOH)를 사용하였고, 농도는 3M로 하였다. W/B 비에 따른 강도는 1, 3, 7 그리고 28일을 측정하였다. 유동성 측정 결과는 실리카 퓸의 치환율이 증가할수록 감소하였다. 압축강도는 실리카 퓸의 치환율이 증가할수록 증가하였다. 또한 W/B 비가 증가할수록 모든 재령에서 강도는 감소하였다. 실리카 퓸은 W/B 비와 실리카 퓸의 치환율에 따라서 활성화 반응을 증대시켜 강도를 증가시키는 것을 알 수 있었다.

• 자원리싸이클링
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• 제22권6호
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• pp.12-18
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• 2013

본 연구에서는 수축저감 효과를 높이고, 강도를 증진시키기 위해 $C_{12}A_7$계 슬래그를 사용한 수축저감제 및 이를 이용한 모르타르를 제조하였다. 또한 시멘트 사용량을 줄이기 위해, 플라이애쉬와 고로슬래그의 함량을 변화시킨 모르타르의 응결시간, 플로우, 압축강도를 측정하였다. 플라이애쉬와 고로슬래그 함량이 증가할수록 플로우 값이 증가하였고, 응결시간이 지연되는 것을 확인할 수 있었다. 또한 혼합재 함량 증가에 따라 초기재령에서는 압축강도가 낮아지지만, 장기재령에서는 높은 압축강도 값을 나타내었다.