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양영수(Young-Soo Yang),이재은(Jae-Eun Lee) 한국무역연구원 2016 무역연구 Vol.12 No.3
The purpose of this study is to investigate the impact of human capital and social capital of Korean firms listed in the Korea Stock Exchange (KSE). Based on the resource-based view(RVB) and knowledge-based view (KVB), we propose that firms with higher human capital and social capital will actively pursue globalization. More specifically, we measured human capital in terms of the foreign work experience and education diversity of top managers while social capital was measured in terms of top manager connections within the external environment. Using a sample of 249 Korean manufacturing firms listed in the KSE from 2000 to 2006, we find that both human capital and social capital are positively related to the globalization of firms. The empirical findings of this study imply that besides being one of the important factors that trigger global expansion, human and social capital can become strategic assets that are not easily imitated by competitors.
양영수(Young-Soo Yang),이재홍(Jae-Hong Lee) 한국무역연구원 2016 무역연구 Vol.12 No.4
This study investigates the role of foreign investors in promoting the internationalization strategy of investing firms. With the opening of domestic financial markets to foreign investors over the last two decades, their investment and trading behavior have merited attention from academic researchers, practitioners, and regulatory bodies. Effective external monitoring mechanisms such as foreign ownership may encourage managers to engage in long-term investment, and the degree of foreign monitoring power may differ according to the degree of information asymmetry. Using a sample of 2,586 firm-year observations over the period from 2001 to 2006, this paper finds that foreign investors play an important role in increasing internationalization strategy employed by firms. This suggests that foreign investors with advanced investment strategies and capabilities monitor long-term firm investment more actively. In addition, the impact of foreign investor monitoring is relatively weaker in an information environment where they are confronted by higher information asymmetry.
제주도 민속식물인 선인장(Opuntia ficus-indica (L.) Mill.)의 분류학적 검토 후 명명
양영수 ( Yang Young-soo ),최병기 ( Choi Byoung-ki ),오홍식 ( Oh Hong-shik ) 한국전통조경학회(구 한국정원학회) 2020 한국전통조경학회지 Vol.38 No.4
본 연구는 제주지역에 분포하는 선인장에 대하여 형태학적 특성 비교를 통하여 종을 분류하고 오동정을 바로잡는데 목적을 두고 있다. 연구 결과 제주도에 자생하는 것으로 보고되어 온 Opuntia ficus-indica 또는 Opuntia ficus-indica var. saboten은 Opuntia stricta인 것으로 밝혀졌다. 종의 형태학적 비교에서 O. stricta는 기존 보고 종에 비해 식물크기, 엽상경의 형태, 꽃과 열매의 색, 자좌의 특징 등에서 분명한 차이를 보이는 것으로 확인하였다. 연구결과를 바탕으로 본 분류군의 학명을 Opuntia stricta로 정정하고, 국명으로 ‘해안선인장’을 명명할 것을 제안한다. 나아가 다양한 연구문헌 및 국가 생물다양성 운영기관에서도 종의 오동정를 확인하고 이를 수정하는 작업이 필요함을 제시하였다. The purpose of this study is to classify species and correct misidentification of cacti (Opuntia) in Jeju area through morphological characteristics comparison. As a result of the study, it was found that Opuntia ficus-indica and O. ficus-indica var. saboten, which has been reported to grow naturally in Jeju Island, is Opuntia stricta. In the morphological comparison of species, it was confirmed that O. stricta showed clear differences in plant size, cladode shape, color of flowers and fruits, and characteristics of areole compared to the existing reported species. Based on the research results, the scientific name of Jeju cactus was corrected as Opuntia stricta, and the Korean name ‘Hae-an-sun-in-jang‘ was newly named. Furthermore, it was suggested that various research literatures and national biodiversity management organizations need to confirm and correct the misidentification of species.
자유곡면의 형상 측정에서 shape-from-shading을 접목한 스테레오 비전의 적용
양영수(Young-Soo Yang),배강열(Kang-Yul Bae) 한국기계가공학회 2017 한국기계가공학회지 Vol.16 No.5
Shape-from-shading (SFS) or stereo vision algorithms can be utilized to measure the shape of an object with imaging techniques for effective sensing in non-contact measurements. SFS algorithms could reconstruct the 3D information from a 2D image data, offering relatively comprehensive information. Meanwhile, a stereo vision algorithm needs several feature points or lines to extract 3D information from two 2D images. However, to measure the size of an object with a freeform surface, the two algorithms need some additional information, such as boundary conditions and grids, respectively. In this study, a stereo vision scheme using the depth information obtained by shape-from-shading as patterns was proposed to measure the size of an object with a freeform surface. The feasibility of the scheme was proved with an experiment where the images of an object were acquired by a CCD camera at two positions, then processed by SFS, and finally by stereo matching. The experimental results revealed that the proposed scheme could recognize the size and shape of freeform surface fairly well.
양영수(Young-Soo Yang),배강열(Kang-Yul Bae) 한국기계가공학회 2017 한국기계가공학회지 Vol.16 No.2
The pipe connection process using a clamping ring is used for joining small pipes in the refrigerator and air-conditioner industries instead of the brazing process, which induces inevitable thermal deformation in the pipes. However, few studies have been carried out on the process to select optimal parameters in joining pipes, and studies on the relation between the process parameters of the connection and connecting force of the joint have not been conducted. In this study, the connection process of pipes with the clamping ring was modeled using the finite element method (FEM) and analyzed to obtain the contact stress distribution between the pipes with which the connecting force of the joint was estimated. Considering the characteristics of pipe connection, the process was modeled and simulated in a two-dimensional axisymmetric solution domain. With the numerical model, the effect of ring shape on the connection was studied by adding a projection to the end of a ring or changing the length of a ring. The results of the analyses revealed that the contact stress distribution could be predicted with the suggested model. The effect of the ring shape was also presented. The effect of any combination of process parameters could be easily estimated through the related analyses.
제주도 부채(손바닥)선인장속(Opuntia) 두 분류군의 계통발생학적 유연관계
양영수(Young-Soo Yang),오홍식(Hong-Shik Oh) 한국자원식물학회 2021 한국자원식물학회지 Vol.34 No.5
In Jeju Island, there are two different types of Opuntia cactus in cladodae, fruit, flower, flowering period and spine. There is no comparative study of these two taxa yet, so it is often seen as the same species. The purpose of this study was to investigate the phylogenetic relationship between the Taxa of the Opuntia monacantha Haw. and Opuntia stricta Haw. in Jeju Island. The results indicate that the two taxa were completely different from each other on the analysis of nrITS, matK and atpB-rbcL gene as well as the morphological comparison. Also, O. monacantha among the two taxa is included in the Elatae series, so South America is the origin, and O. stricta is included in the Scheerianae series, which confirms that North America is the origin. The name of the O. monacantha in Jeju Island was named Jeju-Baick-nyun-cho considering geographical location conditions and symbolic characteristics.