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평점에 따른 OTT 서비스 콘텐츠의 성공과 실패 요인 분석 : 넷플릭스를 중심으로
홍지수(Ji-Soo Hong),박진수(Jin-Soo Park),강성우(Sung-Woo Kang) 한국산업경영시스템학회 2021 한국산업경영시스템학회지 Vol.44 No.4
This study explores multiple variables of an OTT service for discovering hidden relationship between rating and the other variables of each successful and failed content, respectively. In order to extract key variables that are strongly correlated to the rating across the contents, this work analyzes 170 Netflix original dramas and 419 movies. These contents are classified as success and failure by using the rating site IMDb, respectively. The correlation between the contents, which are classified via rating, and variables such as violence, lewdness and running time are analyzed to determine whether a certain variable appears or not in each successful and failure content. This study employs a regression analysis to discover correlations across the variables as a main analysis method. Since the correlation between independent variables should be low, check multicollinearity and select the variable. Cook s distance is used to detect and remove outliers. To improve the accuracy of the model, a variable selection based on AIC(Akaike Information Criterion) is performed. Finally, the basic assumptions of regression analysis are identified by residual diagnosis and Dubin Watson test. According to the whole analysis process, it is concluded that the more director awards exist and the less immatatable tend to be successful in movies. On the contrary, lower fear tend to be failure in movies. In case of dramas, there are close correlations between failure dramas and lower violence, higher fear, higher drugs.
메탄의 열-촉매 분해에 의한 수소 및 탄소 제조 기술 동향
홍지수 ( Jisoo Hong ),강석창 ( Seok Chang Kang ),박수열 ( Soo-youl Park ),이제욱 ( Jea Uk Lee ),임지선 ( Ji Sun Im ),전영표 ( Young-pyo Jeon ),홍진용 ( Jin-yong Hong ),이철위 ( Chul Wee Lee ) 한국공업화학회 2020 공업화학전망 Vol.23 No.4
수소는 에너지를 방출하는 과정에서 이산화탄소와 질소산화물와 같은 유해한 물질 없이 물만 부산물로 배출하기 때문에 지속 가능한 청정에너지원 중의 하나이다. 수소를 생산하는 공정 중 메탄 열-촉매 분해는 고온에서 메탄을 분해 시켜 수소와 탄소로 전환시키는 기술로서, 가장 큰 장점은 이론적으로 이산화탄소의 발생 없이 수소를 생산할 수 있기 때문에 현존하는 수소 생산 기술에서 가장 친환경적인 공정으로 알려져 있다. 최근의 연구는 메탄의 전환율을 높이기 위한 금속 및 탄소 기반 촉매에 대하여 연구하고, 생성되는 수소의 경제성 확보를 위해 부산물인 고체탄소의 고부가화에 초점이 맞추어지고 있다. 본 보문은 금속 기반 불균일 촉매의 연구 동향을 살펴보았고 촉매의 활성과 비활성화 및 재생 기술에 대하여 검토하였다. Hydrogen is one of the sustainable clean energy sources because it produces water only as a by-product without emitting toxic gases such as carbon dioxide and nitric oxides dring combustion. Thermo-catalytic decomposition (TCD) of methane is a technology that decomposes methane at high temperatures and converts it into hydrogen and solid carbon over catalysts. Theoretically, the strong point of TCD process is that hydrogen can be produced without emitting carbon dioxide, so it is known as the most environmentally friendly process among the existing hydrogen production technologies. Recent researches have focused on the development of metal and carbon-based catalysts in order to increase the conversion of methane and on the high value added product of solid carbon for enhancing the price of hydrogen produced during TCD of mathane. In this review the research trends of metal-based heterogeneous catalysts, their activity, deactivation and regeneration techniques in the field of TCD of methane were surveyed.
김영재(Kim Young Jae),남민우(Nam Min Woo),김영민(Kim Young Min),홍지수(Hong Ji Soo),홍성희(Hong Sung Hee) 한국통신학회 2021 한국통신학회 학술대회논문집 Vol.2021 No.6
본 논문은 홀로그램 연구에 사용되는 많은 광학 계산과 알고리즘 구현에 필요한 프로그래밍 라이브러리를 위해 개발되는 홀로그래피 오픈 소스 라이브러리(오픈홀로)에 대한 소개이다. 오픈홀로는 홀로그램과 관련된 다양한 광학적 계산을 쉽게 할 수 있게 하는 라이브러리를 의미한다. 이러한 오픈홀로의 주목적은 홀로그램에 대한 이해도가 낮은 초보자나 일반인들도 이를 활용하여 홀로그램의 광학적 특성을 시뮬레이션하거나, 홀로그램 콘텐츠를 제작할 수 있게 라이브러리를 오픈 소스화 하는 것이다.
Bacillus subtilis SS103으로 제조한 된장의 품질 특성 및 Angiotensin 전환효소 저해 활성
홍지수,박정륭,전정례,차명화,김진,김정희 동아시아식생활학회 2004 동아시아식생활학회지 Vol.14 No.4
Three different doengjang(fermented soybean paste) were prepared by using B. subtilis SS103 with high angiotensin converting enzyme(ACE) inhibitory activity, Asp. oryzae and mixed culture of two organisms, respectively. Quality characteristics and the inhibitory activity were compared. β-Amylase activity rapidly increased during 30 days of fermentation, but lower activity was found in doenjang prepared with B. subtilis. However, α-Galactosidase activity decreased for 15 days of fermentation and little activity was observed after that fermentation period. Protease production tended to increase during the fermentation. High protease activity was found only in doengjang prepared with Asp. oryzae, but the doengjang prepared with B. subtilis SS103 showed very low activity. Total isoflavone content at 90 day fermentation was the highest in doengjang prepared with mixture of Asp. oryzae and B. subtilis. ACE inhibitory activity increased during the fermentation period. The highest activity was found in doengjang made with mixture of Asp. oryzae and B. subtilis. Sensory evaluation on doengjang itself and its soup indicated that doengjang made with mixture of Asp. oryzae and B. subtilis showed higher acceptability on taste, flavor and color than those prepared with only Asp. oryzae or B. subtilis, respectively.