• 문화경제연구
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• 제21권1호
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• pp.3-20
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• 2018

본 연구는 한국 영화산업의 수직계열화 구조와 배급 및 상영시장의 집중도를 파악하고, 이 두 범주 간의 상호연관성에 대한 통합적인 맥락을 제시하고자 하였다. 한국영화 배급 및 상영시장의 집중성은 규모의 경제를 추구하고 수요의 불확실성을 방어하기 위한 산업 논리의 결과이다. 메이저 배급사는 대작영화에 자원을 집중하고 공급량을 조절함으로써 흥행위험을 방어하려는 경향이 강해지고 있으며, 최대한 많은 스크린을 확보하려는 배급 경쟁에 의해 멀티플렉스 체인의 협상력은 강화되고 있다. 수직결합 기업의 멀티플렉스는 계열관계에 따라 각 배급사의 영화에 차별적인 좌석수를 배정하는 것으로 나타났다. 그러나 수직계열화 기업마다 차별의 정도는 차이가 있으며, 상영 스크린수가 증가할수록 관객의 좌석점유율도 증가하고 있어서, 상영관이 계열관계에 따라 비합리적인 선택을 한다고 보기에는 무리가 있다. 따라서 수직결합구조가 스크린 독과점과 양극화의 원인이라는 일반화하기는 어려우며 유통시장의 집중성을 완화하고 중소영화를 지원하는 정책 방향이 요구된다.

• 산경연구논집
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• 제15권3호
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• pp.11-20
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• 2024

Purpose: This study focuses on the Chinese smartphone market to estimate product attributes influencing Chinese customers' preference for developing new smartphones through conjoint analysis. Research design, data and methodology: The online questionnaire survey is processed among Chinese potential smartphone customers. Conjoint analysis including traditional conjoint analysis (TCA) and choice-based conjoint analysis (CBCA), is used to analyze the useful data of 500. Results: Results indicate that price is the most important predictor while screen size is the least for Chinese customers' preference whether the method is TCA or CBCA. However, the importance of brand, capacity, CPU, and screen design is different. Moreover, based on each smartphone attribute level's utility, the new products with the best combinations are different compared with both methods. Finally, the predicted market shares of the top 3 products are the same with maximum utility rule model between TCA and CBCA. However, when considering with the new best combined product, they are significantly different. Conclusions: Managers should recognize the differences between TCA and CBCA and select the best method to develop new smartphones for sustainable business in the Chinese competitive market based on the important attributes of price, brand, capacity, CPU, screen design, and size.

• 한국인터넷방송통신학회논문지
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• 제15권1호
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• pp.187-190
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• 2015

최근, 현대인들의 필수품인 '스마트 폰'이 상용화 되면서 곳곳에 '스마트' 한 생활을 위한 기술들이 개발되고 있다. 이에 본 논문은 레이저를 이용한 디스플레이 및 스피커와 방향제를 엘리베이터 내부에 도입하여 내부 화면의 다양화를 연출하고, 핸드오버기술로 지속적인 와이파이 호환이 가능한 이용자 단말기 상의 엘리베이터 조절 화면 출력기능 탑재로 이용자의 스마트폰을 통해 엘리베이터를 조작할 수 있으며 승강기 외부 상단에 장착된 키넥트로 이용자의 동작을 인식하여 작동되는 기존 엘리베이터 시스템과 차별화된 새로운 스마트스크린 엘리베이터 시스템을 제안하고자 한다. 마지막으로 엘리베이터 제조사, 유통사, 소비자 각 집단 200명을 대상으로 레이저스크린 엘리베이터의 상용화에 대한 설문조사를 진행한다.

• 대한수학회논문집
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• 제28권1호
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• pp.163-175
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• 2013

In this paper, we prove a classification theorem for Einstein lightlike hypersurfaces M of a Lorentzian space form ($\bar{M}$(c), $\bar{g}$) with a semi-symmetric metric connection subject such that the second fundamental forms of M and its screen distribution S(TM) are conformally related by some non-zero constant.

• 대한수학회논문집
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• 제27권1호
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• pp.185-195
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• 2012

We study the geometry of lightlike hypersurfaces M of an inde nite cosymplectic manifold $\bar{M}$ such that either (1) the characterist vector field $\zeta$ of $\bar{M}$ belongs to the screen distribution S(TM) of M or (2) $\zeta$ belongs to the orthogonal complement $S(TM)^{\perp}$ of S(TM) in $T\bar{M}$.

• 대한수학회지
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• 제51권2호
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• pp.311-323
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• 2014

In this paper, we construct two types of non-tangential half lightlike submanifolds of a semi-Riemannian manifold admitting a semi-symmetric non-metric connection. Our main result is to prove several characterization theorems for each types of such half lightlike submanifolds equipped with totally geodesic screen distributions.

• 한국수학교육학회지시리즈B:순수및응용수학
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• 제16권1호
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• pp.31-46
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• 2009

In this paper we study the geometry of Einstein half light like submanifolds M of a Lorentz manifold ($\bar{M}$(c), $\bar{g}$) of constant curvature c, equipped with an integrable screen distribution on M such that the induced connection ${\nabla}$ is a metric connection and the operator $A_u$ is a screen shape operator.

• Journal of the Korean Wood Science and Technology
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• 제44권2호
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• pp.166-171
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• 2016

Size reduction is one of the major pre-processing operations in using biomass as a source of energy or raw materials for forest products industry. The grinding characteristics of dried yellow poplar wood chips were investigated using laboratory knife mill with three different screen aperture diameters to provide the basic information for the optimizing of size reduction processes in biomass industry. Average specific energy consumptions were 0.157, 0.137, and 0.093 Wh/g for the screen aperture diameters of 5.0, 7.5, and 9.0 mm, respectively. According to the results of size distribution analysis of ground particles, the sizes of the most of ground particles were much smaller than the aperture diameters of the screens installed on knife mill used in this study.

• 한국산업보건학회지
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• 제20권3호
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• pp.192-202
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• 2010

This study aimed to suggest the severity of indoor air pollutants in screen gold arenas which were not sufficiently investigated in Korea up to now and to help users to enjoy golf in more pleasant indoor environment. The indoor environment survey was conducted with 21 screen gold arenas in Seoul from Oct. 28, 2008 to March 13, 2009. Indoor air quality was measured and analyzed in accordance with the Air Pollution Process Test Method specified bu NIOSH(2005). The screen golf arenas are mostly in the underground floors in this study, 4 on the ground floors(19.0%) and 17 in the underground floors(81.0%). In the air in screen golf arenas, the geometric mean of benzene, toluene, ethylbenzene and xylene were 2.92 ${\mu}g/m^3$, 70.34 ${\mu}g/m^3$, 14.00${\mu}g/m^3$ and 31.43 ${\mu}g/m^3$, respectively, which exceeded the exposure limites. Each arena exceeded the exposure limit for one pollutant each. However, styrene didn't exceed the limit as 8.09 ${\mu}g/m^3$. Furthermore, the geometric mean of formaldehyde was 63.11${\mu}g/m^3$ and 7 arenas exceeded the limit. The geometric mean of volatile organic compounds(VOCs) was 428.41${\mu}g/m^3$ and 10 arenas exceeded the limit. For the density distribution of pollutants by location, benzene, toluene, ethylbenzene, xylene, styrene and formaldehyde showed higher density distribution in underground spaces, for which the statistically significant difference was not found. However, PM10 showed the statistically significant difference (p<0.05). In accordance with the analysis on the correlation between the density of pollutants in the screen golf arenas, Pearson correlation coefficient between ethylbenzene and styrene was 0.980, very significant correlation(p<0.01). The correlation coefficients between the density of toluene, ethylbenzene, xylene and styrene and that of VOCs were 0.543, 0.434, 0.451 and 0.459, respectively, which demonstrated the statistically significant difference (p<0.05).

• East Asian mathematical journal
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• 제24권4호
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• pp.421-429
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• 2008

We study invariant lightlike submanifolds and almost contact CR-lightlike submanifolds of an indefinite cosymplectic manifold.