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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.
X형 개선을 가진 후판 맞대기 용접에 있어서 유한요소법을 이용한 각변형 해석
양영수(Young-Soo Yang),배강열(Kang-Yul Bae) 한국기계가공학회 2018 한국기계가공학회지 Vol.17 No.4
Removal of angular deformation induced during the welding of butt joints in thick steel plates needs expert skill and is costly. To reduce deformation, proper joint designs are studied with a prediction of deformation prior to welding. However, as the thickness of a plate increases, a predictive analysis of the welding process is more difficult, especially if there is an increase in the number of welding passes in the joint. In this study, a numerical model with the finite element method (FEM) was developed to analyze the angular deformation in the multi-pass welding of butt joints of plates made of AH32 steel that had a thickness of up to 100 mm. A series of numerical simulations were then performed based on the developed model to predict the deformations for thick plates. With the results obtained by the analyses, this study suggested optimal X-shape grooves for the butt joints of thick plates to minimize the angular deformation. As the thickness of the plate increased to 100 mm, the ratio of the depth of the front-side groove to that of the back-side groove should be gradually increased to nearly 1:3.
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.