• 동의생리병리학회지
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• 제20권3호
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• pp.590-595
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• 2006

To investigate the anti-cancer effects of n-butanol fraction of DoJeokSeungKi-Tang extracts(nBFD) in U-937 cells. MTT assay was used to determine U-937 cells proliferation. Flow cytometry was used to detect apoptosis. Bcl-xl anti-apoptotic protein and caspase-3, p53 pro-apoptotic protein were examined by Western blot analysis. nBFD inhibited the proliferation of U-937 cells in a dose-dependent manner. The cells treated with nBFD showed a typical apoptotic process by increasing sub-Gl peak. nBFD reduced uptake of 3,3'dihexyloxacarbocyanine iodide(DiOC6) a fluorochrome which incorporates into cells dependent upon their mitochondrial transmembrane potential$({\triangle}{\psi}m)$. nBFD induced in U-937 cells apoptosis mainly via increasing sub-Gl peak, regulation of Bcl-xl, caspase-3 and p53 protein.

• 한국멀티미디어학회논문지
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• 제23권12호
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• pp.1464-1475
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• 2020

Due to the spread of COVID-19, the online lecture has become more prevalent. However, it was found that a lot of students and professors are experiencing lack of communication. This study is therefore designed to improve interactive communication between professors and students in real-time online lectures. To do so, we explore deep learning approaches for automatic recognition of students' facial expressions and classification of their understanding into 3 classes (Understand / Neutral / Not Understand). We use 'BlazeFace' model for face detection and 'ResNet-GRU' model for facial expression recognition (FER). We name this entire process 'Degree of Understanding (DoU)' algorithm. DoU algorithm can analyze a multitude of students collectively and present the result in visualized statistics. To our knowledge, this study has great significance in that this is the first study offers the statistics of understanding in lectures using FER. As a result, the algorithm achieved rapid speed of 0.098sec/frame with high accuracy of 94.3% in CPU environment, demonstrating the potential to be applied to real-time online lectures. DoU Algorithm can be extended to various fields where facial expressions play important roles in communications such as interactions with hearing impaired people.

• 한국HCI학회:학술대회논문집
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• 한국HCI학회 2006년도 학술대회 2부
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• pp.39-47
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• 2006

삶의 질을 향상시키기 위한 유비쿼터스 테크놀로지 도입으로 인해 제품개발, 주거, 상업시설 등에서 시작하여 최근 유비쿼터스 환경 구축의 일환으로 u-City 구현에 중점을 두고 많은 연구 진행되고 있다. 그 중 가로환경 디자인은 공공 시설로서 유비쿼터스 환경 구축의 중요한 이슈가 되고 있다. 그러나, 오늘날 가로 공간은 그 수가 양적으로 팽창되었을 뿐 각각의 특색에 맞게 조성되고 있지는 못하며, 물리적 환경개선에 중점을 두어 단순한 가로정비 수준에 머물고 있다. 이로 인해 지역주민과 이용자 중심의 참여에는 부족한 면이 많았다. 이에 본 연구는 유비쿼터스 테크놀로지를 도입하여 보다 실용적이고 현실 참여적인 공간으로 디자인함으로써 새로운 u-Street 디자인을 제안하고자 한다. 또한, 이와 같은 공공장소에서의 서비스가 이용자들과 어떠한 인터렉티브 커뮤니케이션을 가질 수 있을지에 대해 살펴보고 이를 디자인에 반영하여 공간이 인간과의 상호작용을 원활히 하고 감성적인 공간 디자인이 될 수 있도록 u-Service 를 개발하는 데 중점을 두고자 한다. 본 연구는 부산 광복로를 사례로 진행되었으며, 그 결과 다음과 같은 측면에서 기대효과를 예측할 수 있다. 첫째, u-City 의 기반 시설로서의 u-Street는 수평적이고 친환경적인 가로 경험을 통해 사람이 직접 여러 서비스와 인터렉션할 수 있다. 둘째, 본 연구에 제안된 u-Service 는 이전 광복로의 침체되고 비활동적인 공간을 활동적이고 생동감있는 공간으로 재활성화시키는데 중요한 매개체로서의 역할을 하게 될 것이다. 셋째, 주민과 이용자들의 적극적인 참여를 유도하여 지속적인 공간을 만들어 내는 데 크게 기여할 것이다.

• 아태비즈니스연구
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• 제13권4호
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• pp.135-149
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• 2022

Purpose - The primary objective of this article is to investigate the impact of U.S. monetary policy on institutional / individual / foreign investor reactions in the Korean stock market. Design/methodology/approach - This study employs a high frequency event study methodology to identify U.S. monetary policy shocks and quantify the impact of identified shocks on investor reactions. The dependent variable in the regression model is net stock purchase, while the explanatory variables are U.S. monetary policy shocks. The model is estimated for the period 2000-2019, including 156 FOMC meetings. Findings - Foreign investors immediately sell stocks in response to contractionary U.S. monetary shocks. They do not, however, react to anticipated changes in monetary policy rates, confirming the rationality of foreign investors. Individual investors demonstrate the opposite response, indicating that a non-trivial proportion of individual investors are irrational. Research implications or Originality - This study adds to the current literature on the effect of U.S. monetary policy on the Korean stock market. This study demonstrates a heterogeneous response to U.S. monetary policy shocks, validating the rational investment behavior of foreign investors, while individual investors exhibit a certain degree of irrationality. Methodologically, this study adds to the literature by quantifying the impact of U.S. monetary policy employing a sharper identification method allowing a simple and consistent estimation.

• 한국철도학회논문집
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• 제12권3호
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• pp.388-395
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• 2009

유리섬유시트로 보강된 철근콘크리트 보의 휨 거동을 조사하기 위해, 하나의 기준보와 8개의 보강보(4개의 NU-보강보, 4개의 U-보강보)에 대한 보강보 휨 실험을 수행하였다. NU 보강보는 단부에 U 밴드를 적용하지 않은 보를, U-보강보는 U 밴드를 가진 보를 의미한다. 보강보 실험에서의 실험변수들은 유리섬유시트의 보강 양, U 밴드의 유무 등이 있다. 기준보와 비교하여 NU 보강보와 U 보강보의 최대하중은 각각 48%와 34% 증가하였으며, 휨 강성은 각각 920%와 880% 증가하였다. NU 보강보와 U 보강보에 대한 연성지수는 1.43에서 2.60 사이에 놓여있다. U 밴드를 가진 보강 시스템은 섬유시트의 계면박리 파괴를 지연시키고, U 밴드가 없는 보강시스템보다 나은 연성거동을 나타내 보였다. NU 보강보와 U 보강보 모두에서 섬유시트 겹수의 증가에 따라 최대하중과 휨 강성은 증가하였다. 실험결과들을 이론적인 비선형 휨 해석결과와 비교하였으며, 잘 일치함을 확인하였다.

• 한국생물공학회:학술대회논문집
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• 한국생물공학회 2003년도 생물공학의 동향(XII)
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• pp.511-511
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• 2003

• 대한수의사회지
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• 제19권1호
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• pp.33-38
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• 1983

Aeromonas punctata subgroup caviae and Plesiomonas shigelloides were isolated and identified from the lesion of ulcer disease of crusion carp in Ban Wol storing reservoir, the kyungki-do province.

• 충청수학회지
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• 제25권4호
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• pp.731-738
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• 2012

Let L(M) be the bundle of all linear frames over $M,\;u$ an arbitrarily given point of L(M), and ${\nabla}\;:\;\mathfrak{X}(M)\;{\times}\;\mathfrak{X}(M)\;\rightarrow\;\mathfrak{X}(M)$ a linear connection on L(M). Then the following results are well known: the horizontal subspace and the connection form at the point $u$ may be written in terms of local coordinates of $u\;{\epsilon}\;L(M)$ and Christoffel's symbols defined by $\nabla$. These results are very fundamental on the study of the theory of connections. In this paper we show that the local expressions of those at the point $u$ do not depend on the choice of a local coordinate system around the point $u\;{\epsilon}\;L(M)$, which is rarely seen. Moreover we give full explanations for the following fact: the covariant derivative on M which is defined by the parallelism on L(M), determined from the connection form above, coincides with $\nabla$.

• 재무관리연구
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• 제11권2호
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• pp.195-221
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• 1994

This study investigates the wealth effect of foreign acquisition of U.S. based firms. Contrary to previous studies, this analysis demonstrates that after appropriate control of domestic-acquired targets, the wealth gains to the shareholders of targets in foreign takeovers are similar to those in domestic takeovers. This paper investigates the validity of the competitive acquisition market in cross-border takeovers and concludes that : 1) in cases of inward foreign direct investment into the U.S., foreign firms do not realize significant net benefits from acquisitions; and 2) the foreign acquirer is as well informed as its U.S, counterparts about the target's market. The results of this study are consistent with the view that each country has different motivations for investing in the U.S. market. Consider, for example, Japan. The evidence suggests that Japanese companies pay a considerable price for U.S. targets which have performed poorly before the takeover. While there is no specific rationale to explain why Japanese firms buy the most volatile and worst performing firms, international barriers may provide a possible reason for these anomalies. Overall, the evidence of this paper supports the view that foreign takeovers occur in a competitive acquisition market.

• 한국의상디자인학회지
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• 제3권2호
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• pp.137-160
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• 2001

A study on the structural change in the U.S. textile industry. The U.S. textile industry has undergone significant changes over the last fifty years, including a steady decline in the relative scale of domestic production, employment reduction, and increased competition from imported products. In order to weather a crisis, the responses of the U.S. textile industry have been made such as investment in technology, specalization in the textile and apparel industries. The textile and apparel industries have taken steps to increase labor productivity through automations to speed management to create and introduce new products and new methods, and have lowered indirect overhead costs. Regarding these response of the U.S. and other situation of world textile and apparel trade market, much of the sense of crisis that pervades korean textile and apparel industries has to do with the problem of adjusting corporate policy.