• 한국세라믹학회지
• /
• 제51권6호
• /
• pp.598-604
• /
• 2014

Considerable research efforts have been explored attempting to enhance the thermal durability of thermal barrier coatings (TBCs) at the high operating temperatures of gas turbines. In this study, the suspension plasma spray (SPS) process was applied to produce TBCs with a segmented structure by using an yttria-stabilized zirconia (YSZ) suspension. Four different experiment sets were carried out by controlling the ratio between surface roughness of the bond coat and feed stock size ($R_a/D_{50}$) in order to examine the effect of $R_a/D_{50}$ ratio on the microstructure of SPS-prepared coatings. When the $R_a/D_{50}$ had a high value of 11.8, a deposited thick coating turned out to have a cone-type columnar microstructure. In contrast, at the low $R_a/D_{50}$ values of 2.9 and 0.18, a deposited thick coating appeared to have a dense, vertically-cracked microstructure. However, with the very low $R_a/D_{50}$ value of 0.05 the coating was delaminated.

• 수산해양교육연구
• /
• 제23권1호
• /
• pp.35-42
• /
• 2011

Behaviour habitats of sailfin sandfish, Arctoscopus japonicus, one of the stock recovery species of Korea, were investigated when they were approaching toward the eastern coastal waters of Korea during spawning season. Underwater surveys were conducted in December, 2009 at Jug-island, Goseong, Gangwon-province to observe the behaviour of sailfin sandfish by underwater video camera and underwater camera, and the body characteristics of sailfin sandfish caught by gillnet were measured. It was observed that the species generally move in school but a few of individuals go out of the school to approach and dig into the sand bottom. Eggs of sailfin sandfish were shown in many cases to be attached to seaweed like Sargassum fulvellum and Zostera mairna. The females maintain its body in horizon and shake the body to breed eggs. It was also observed that the males spray sperm on the eggs attached on seaweed. Sailfin sandfish is assumed to make diurnal migration by moving to the shallow coast at night for spawning and fertilization, and moving out to the offshore at sunrise.

• 한국정보통신학회논문지
• /
• 제23권9호
• /
• pp.1032-1037
• /
• 2019

기존 약국 자동화 시스템에서는 약품 최초투입 시, 설비 운용 중에 수량 측정을 하지 않은 채 메모리 상에서만 수량 관리를 해왔다. 이로 인해 설비의 오류 시 운용 도중 이미 차감되어 버린 약품에 대한 수량 관리가 이루어지지 않았다. 수량 관리가 되지 않아 관리가 필요한 중요한 약품의 경우 심각한 문제를 야기하고 있다. 또한 설비 외부에 약품에 대한 잔량을 사용자에게 알려주는 부분이 없어 사용자는 해당 약품의 재고 소진 시 약품을 다시 채워 넣어야 했다. 약품의 재고 소진 시 설비는 운용을 멈추기 때문에 재가동까지의 시간과 해당 약품을 다시 채워 넣는 시간까지의 손해를 가진 채 운영되고 있다. 이에 본 논문에서는 약국 자동화 관리 시스템의 로봇에 변위 센서를 추가하여 약품들의 수량을 수시로 관리하는 시스템을 설계 및 구현하였다.

• Forest Science and Technology
• /
• 제14권4호
• /
• pp.181-191
• /
• 2018

This study was carried out in the teaching and research forest of the University of Dschang in Belabo, with the aim of analysing land-cover and land-use changes as well as carbon stocks dynamic. The databases used are composed of three Landsat satellite images (5TM of 1984, 7ETM + of 2000 and 8OLI of 2016), enhanced by field missions. Satellite images were processed using ENVI and ArcGIS software. Interview, focus group discussion methods and participatory mapping were used to identify the activities carried out by the local population. An inventory design consisting of four transects was used to measure dendrometric parameters and to identify land-use types. An estimation of carbon stocks in aboveground and underground woody biomass was made using allometric models based on non-destructive method. Dynamic of land-cover showed that the average annual rate of deforestation is 0.48%. The main activities at the base of this change are agriculture, house built-up and logging. Seven types of land-use were identified; adult secondary forests (64.10%), young secondary forests (7.54%), wetlands (7.39%), fallows (3.63%), savannahs (9.59%), cocoa farms (4.28%) and mixed crop farms (3.47%). Adult secondary forests had the highest amount of carbon ($250.75\;t\;C\;ha^{-1}$). This value has decreased by more than 60% for mixed crop farms ($94.67\;t\;C\;ha^{-1}$), showing the impact of agricultural activities on both forest cover and carbon stocks. Agroforestry systems that allow conservation and introduction of woody species should be encouraged as part of a participatory management strategy of this forest.

• 한국융합학회논문지
• /
• 제13권3호
• /
• pp.265-274
• /
• 2022

본 연구는 2020년 1년간 수집된 심폐정지환자 세부상황표(2020년, 원시자료) 3,418건을 대상으로 하였다. 또한, 관련 법률과 지침을 조사하여 고찰하는 후향적 서술조사연구이다. 연구 결과, 첫째. '목격자에 의한 심폐소생술' 시행률 30.66%(1,047건)는 주목할 만한 결과로, 관련 법률 및 지침이 짜임새 있게 마련되어 있음을 짐작해 볼 수 있다. 둘째, '목격자에 의한 자동심장충격기 사용은 불과 0.10%(5건)에 불과한 것으로 나타났다. 이는 관련 법률 및 지침이 '구비 및 의무'에 다소 치우쳐 있기 때문으로 사료되며, 지역별 관련 대응 방법 모색의 전략적 차별성을 두어야 함을 시사한다. 셋째, 대구지역의 심정지 발생 장소는 가정이 71.97%(2,640건)로 나타났다. 향후 심정지 대응의 지역별 '맞춤전략' 및 '특별구급대'의 효율적 운영을 위하여, 원시데이터를 활용한 고급통계분석중심의 후속 연구가 필요하다.

• 디지털융복합연구
• /
• 제20권2호
• /
• pp.375-381
• /
• 2022

본 연구의 목적은 4차 산업혁명의 시대와 함께 코로나19라는 감염병의 시대를 힘겹게 살아가고 있는 현대인들의 시대적인 배경 속에서 헤테로토피아적 관점에서 본 필립스탁의 공간표현 특성을 알아보고자 하는 것이다. 연구 방법으로는 은퇴 후 더욱 활발히 활동하는 2015년부터 현재까지 인테리어 공간의 완공작품을 중심으로 총 11곳을 선정하여 문헌 및 사례 연구를 통하여 공간표현 특성을 알아보고자 한다. 결과로는 공간만이 가지고 있는 서사성의 공간표현 특성이 가장 빈도가 높았으며, 장소를 표현하기 위한 시간의 중첩의 형태인 상상의 공간과 환상성의 특성이 상호연관이 있다는 것을 알 수 있었다. 서사성과 환상성, 상상의 공간 특성을 사용하는 필립스탁의 디자인 방법은 헤테로토피아적 특성을 충분히 나타낸다고 볼 수 있으며 새로운 공간의 설계 시 또 다른 디자인 방법론으로 사용할 수 있다고 본다.

• 한국엔터테인먼트산업학회논문지
• /
• 제13권3호
• /
• pp.77-89
• /
• 2019

한류열풍이후 급성장한 우리나라 엔터테인먼트 기업들의 경영을 이끌어온 임원들의 특징은 무엇이며, 이를 통해 어떤 경영 함의점을 추론할 수 있을까? 이런 과제를 해결하기 위해 우리나라 엔터테인먼트 업종의 27개 상장사 임원 293명을 전수 조사해 통계 분석하였다. 연구 결과 아티스트 주변의 제한된 인력에서 벗어나 경영인, IT 전문가, 회계사, 변호사, 아티스트 순으로 직업 경로별 인적 다양성이 높아졌다. 대표이사에게 스톡옵션을 부여한 회사도 전체의 33%였다. 이는 지속가능 경영의 맥락인 전문화, 투명 경영, 디지털과 네트워크 경영, 창의 경영, 동기촉진 경영을 하기 위해 기업이 노력해왔다는 점을 암시하는 데이터로 긍정적 측면이다. 그러나 전형적인 지식창조 기업인 엔터테인먼트 기업에서 창의성, 감수성, 진취성, 역동성과 같은 장점을 발휘하기 쉬운 20~30대 젊은 층과 여성의 임원 비율이 낮고 대표이사(CEO)의 평균 재임기간이 4.02년으로 비교적 길지 않은 것은 향후 개선 과제로 지적되었다.

• Asian Journal for Public Opinion Research
• /
• 제1권3호
• /
• pp.153-202
• /
• 2014

Aside from political leaders' popularity rates and the stock exchange index of business firms, ordinary people are highly interested in aspects of daily life, such as housing, income, health, family, food, human relations and work. Cross-national opinion polls on daily-life satisfaction were carried out in Japan, South Korea, Thailand, Hong Kong, Macao, the Philippines, India, Myanmar, Taiwan, China, Malaysia and Pakistan in the fall of 2013 and winter 2014. The percent difference index (PDI) is formulated as the sum of two positive responses (satisfied and somewhat satisfied) minus the sum of two negative responses (dissatisfied and somewhat dissatisfied). Percent difference indices are given according to society and daily-life aspects. For our analysis to go beneath national average and to go beyond national borders, two lines of analysis are carried out. First, the distance between the level of satisfaction of the top and bottom quartiles is given for each society and according to each of the daily-life aspects. Second, the regional sum of satisfaction of the top quartiles and bottom quartiles are shown crossed by daily-life aspects. In this article we confine ourselves to preliminary comparative description and analysis. More solid and deep comparisons will be carried out by local polling leaders of 12 Asian societies in the succeeding issue of the Asian Journal of Public Opinion Research. Nevertheless, two key threads stand out from this preliminary comparisons. First, social relations (family and human relations) stand out as most satisfied aspects of life in most of twelve societies. Second, the need to go beneath national averages and beyond national borders in analyzing cross-national surveys is confirmed. The comparability and validity of cross-national surveys with varying sampling method and survey mode are briefly discussed toward the end of the article.

• Pediatric Infection and Vaccine
• /
• 제7권1호
• /
• pp.113-119
• /
• 2000

Purpose : Rotavirus is a most common etiologic agent of pediatric gastroenteritis. The standard method to diagnose rotavirus infection was the detection of viral particles in specimens through electron microscopy. But it was complex. Enzyme immunoassay and latex agglutinin are preferred because they are relatively handy, inexpensive and take a short time, in comparison with electron microscopy. However, several reports have shown that the use of ELISA to diagnose rotavirus infection in neonates can result in false positive reactions. The main purpose of this study is to compare ELISA and RT-PCR in the diagnosis of neonatal rotavirus infection. Methods : Data presented in this study were obtained form 123 newborn babies in the nursery of the Fatima Hospital, Masan, Korea, form Jury to December, 1997. We obtained two samples of stool from each of the newborn babies and then performed the Rotazyme test and the RT-PCR. In the Rotazyme test, the results were interpreted according to visual findings. The samples were used for the RT-PCR test after at stock $-30^{\circ}C$ to identify rotavirus group A. The result of the two tests were compared. Results : The informations are divided into 73 males and females. Out of the total informations 15 were transferred from other hospitals. Their average gestational age was $38.5{\pm}1.6$ weeks. The average birth weight was $3134.8{\pm}539gm$. In the Rotazyme test, 75 samples turned out to be positive. Out of them, 55 samples(75.3%) were positive and 18 samples(24.7%) were negative in the RT-PCR. On the other hand, in the Rotazyme test, 50 samples turned out be negative. Out of them, 27 samples(54%) were positive and 23 samples(46%) were negative in the RT-PCR. Conclusion : Rotavirus infection in uncommon in neonates. The diagnosis based on visual findings using Rotazyme test has a disadvantage in the sense that it can result in false positive reactions and false negative reactions in the diagnosis of neonatal rotavirus infection.

• Journal of Ecology and Environment
• /
• 제43권2호
• /
• pp.161-182
• /
• 2019

Quantifying the amount of carbon pools in forest ecosystems enables to understand about various carbon pools in the forest ecosystem. Therefore, this study was conducted in the Chilimo dry afromontane forest to estimate the amount of carbon stored. The natural forest was stratified into three forest patches based on species composition, diversity, and structure. A total of 50 permanent sample plots of 20 m × 20 m (400 ㎡ ) each were established, laid out on transects of altitudinal gradients with a distance of 100 m between plots. The plots were measured twice in 2012 and 2017. Tree, deadwood, mineral soil, forest floor, and stump data were collected in the main plots, while shrubs, saplings, herbaceous plants, and seedling data were sampled inside subplots. Soil organic carbon (SOC %) was analyzed following Walkely, while Black's procedure and bulk density were estimated following the procedure of Blake (Methods of soil analysis, 1965). Aboveground biomass was calculated using the equation of Chave et al. (Glob Chang Biol_20:3177-3190, 2014). Data analysis was made using RStudio software. To analyze equality of means, we used ANOVA for multiple comparisons among elevation classes at α = 0.05. The aboveground carbon of the natural forest ranged from 148.30 ± 115.02 for high altitude to 100.14 ± 39.93 for middle altitude, was highest at 151.35 ± 108.98 t C ha^-1 for gentle slope, and was lowest at 88.01 ± 49.72 t C ha^-1 for middle slope. The mean stump carbon density 2.33 ± 1.64 t C ha^-1 was the highest for the middle slope, and 1.68 ± 1.21 t C ha^-1 was the lowest for the steep slope range. The highest 1.44 ± 2.21 t C ha^-1 deadwood carbon density was found under the middle slope range, and the lowest 0.21 ± 0.20 t C ha^-1 was found under the lowest slope range. The SOCD up to 1 m depth was highest at 295.96 ± 80.45 t C ha^-1 under the middle altitudinal gradient; however, it was lowest at 206.40 ± 65.59 t C ha^-1 under the lower altitudinal gradient. The mean ecosystem carbon stock density of the sampled plots in natural forests ranged from 221.89 to 819.44 t C ha^-1. There was a temporal variation in carbon pools along environmental and social factors. The highest carbon pool was contributed by SOC. We recommend forest carbon-related awareness creation for local people, and promotion of the local knowledge can be regarded as a possible option for sustainable forest management.