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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.
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.
관성 마찰용접 공정에서 심층 신경망을 이용한 업셋 길이와 업셋 시간의 예측
양영수(Young-Soo Yang),배강열(Kang-Yul Bae) 한국기계가공학회 2019 한국기계가공학회지 Vol.18 No.11
A deep neural network (DNN) model was proposed to predict the upset in the inertia friction welding process using a database comprising results from a series of FEM analyses. For the database, the upset length, upset beginning time, and upset completion time were extracted from the results of the FEM analyses obtained with various of axial pressure and initial rotational speed. A total of 35 training sets were constructed to train the proposed DNN with 4 hidden layers and 512 neurons in each layer, which can relate the input parameters to the welding results. The mean of the summation of squared error between the predicted results and the true results can be constrained to within 1.0e-4 after the training. Further, the network model was tested with another 10 sets of welding input parameters and results for comparison with FEM. The test showed that the relative error of DNN was within 2.8% for the prediction of upset. The results of DNN application revealed that the model could effectively provide welding results with respect to the exactness and cost for each combination of the welding input parameters.
K콘텐츠에 대한 중국소비자들의 경험이한국제품 구매의도에 미치는 영향
양영수(Young-Soo Yang),이재은(Jae-Eun Lee) 한국통상정보학회 2020 통상정보연구 Vol.22 No.4
비록, 일부의 선행연구들이 K콘텐츠가 한국제품 구매의도에 미치는 영향을 고찰했지만, 이들은 대부분 K콘텐츠의 단편적인 부분만을 고려하고 있다. 따라서 본 연구는 중국인 소비자들을 대상으로 K패션, K푸드, K드라마, K무비, K-POP 등 포괄적 측면에서 K콘텐츠에 대한 경험이 한국제품 구매의도에 미치는 영향을 실증분석하는 것에 목적이 있다. 연구가설 검증을 위해서 중국인 소비자들을 대상으로 설문조사를 실시하고 다중회귀분석을 실시한 결과 중국인 소비자들의 K패션, K푸드 그리고 K드라마에 대한 경험은 한국제품 구매의도에 유의한 정(+)의 영향을 미치는 것으로 나타났지만, K무비와 K-POP에 대한 경험은 한국제품 구매의도에 통계적으로 유의미한 영향을 미치지 못하는 것으로 나타났다. 이처럼 K콘텐츠에 대한 경험의 상이한 영향력을 검증했다는 점에서 본 연구의 결과는 중국인 소비자들에 대한 효과적인 마케팅 방안을 수립하는데 유의미한 시사점들을 제시할 수 있을 것이다. Although some studies on the purchase intention of K-contents and made-in products to be considered in this study have been conducted, studies that directly analyze the effect of the comprehensive K-contents experience on the purchase intentions of Korean-made products are insufficient. Therefore, the purpose of this study is to empirically analyze the effect of the experience of comprehensive K contents measured in K-fashion, K-foods, K-dramas, K-movies, and K-pop on the purchase intention of Korean products for Chinese consumers. To verify the research hypothesis, a questionnaire survey was conducted on 300 Chinese consumers and empirical analysis was performed using multiple regression analysis. As a result of the analysis, it was found that Chinese consumers experiences of K-fashion, K-food, and K-drama have a positive (+) effect on the purchase intention of Korean products, and K-movie and K-pop are insignificant in the purchase intention of Korean products. Based on the results of this study is expected to provide meaningful implications for establishing marketing plans for potential Chinese consumers.
해외경험의 깊이와 폭이 한국물류기업의 재무적 성과에 미치는 영향
양영수 ( Young Soo Yang ),이재은 ( Jae Eun Lee ) 한국해운물류학회(구 한국해운학회) 2014 해운물류연구 Vol.30 No.2
본 연구는 한국 물류기업을 대상으로 해외경험의 깊이와 폭이 재무적 성과에 미치는 영향을 실증 분석하고 있다. 해외경험과 성과 간의 관계에 대한 많은 선행연구들은 일관된 실증분석 결과를 제시하지 못하고 있다. 본 연구에서는 그 이유를 해외경험을 단일차원으로 고려했기 때문으로 보고, 조직학습이론에 따라 기업의 해외경험을 깊이(depth)와 폭(breadth) 등 두 가지 차원으로 구분하였다. 보다 구체적으로 본 연구에서는 해외경험의 깊이를 ‘기업이 최초로 특정 해외시장에 진출한 이후부터 현재까지 축적해온 해외사업 지식 및 경험의 정도’로, 해외경험의 폭을 ‘기업이 둘 이상의 다양한 해외시장에 진출함으로써 얻을 수 있는 해외사업 지식 및 경험의 정도’로 정의하고 이들이 물류기업의 재무성과에 미치는 영향을 실증 분석 하였다. 한국 상장기업들 중 수상 및 육상, 운송 서비스를 제공하는 19개 물류기업들을 대상으로 1980년부터 2006년까지의 기간 동안의 패널자료(494개의 기업-연도 관찰치)를 구축하여 실증 분석을 실시한 결과는 다음과 같다. 첫째, 해외경험의 깊이는 물류기업의 재무적 성과에 정(+)의 영향을 미치는 것으로 나타났다. 둘째, 해외경험의 폭 역시 물류기업의 재무적 성과에 정(+)의 영향을 미치는 것으로 나타났다. 이러한 실증 분석결과는 선행연구의 결과들과 일관되게 해외경험의 깊이가 외국인 기업으로서의 불리함(예컨대, 외국인 비용)을 감소시키며, 현지시장에서 필요로 되는 유용한 지식의 습득을 용이하게 함으로써 성과향상에 기여하며, 해외경험의 폭 역시 새로운 해외시장으로 진출하는 기업에게 현재의 상황에서 발생될 수 있는 복잡성을 줄여주고 프로세스를 단순화시켜줄 수 있도록 도움을 줄 수 있는 요인으로 작용함으로서 성과향상에 기여한다는 점을 시사한다. This paper analyzes the relationship between types of internationalization experience and financial performance of Korean logistics firms. Specifically, this research examines the types of international experience such as the depth of international experience and the breadth of international experience of Korean logistics firms. The depth of international experience is measured as the number of years since the focal firm’s first foreign expansion through foreign direct investment and it represents the years that took the firm to reach its current international expansion. The breadth of international experience is measured as the number of subsidiaries in which a firm established subsidiaries during its international expansion. Thus, we attempt to explain the types of international experience in terms of learning acquired in the course of past international activities and its impact on performance of the firms. Based on organizational learning theory, we presents two hypotheses. Hypothesis 1 suggests that a higher depth of accumulated experience in international markets will have a positive influence on the financial performance of Korean logistics firms. Hypothesis 2 anticipates that Korean logistics firm``s the diversity of international market experience is positively related to the financial performance of Korean Logistics Firms. Based on the sample of port logistics, land logistics, transportation service firms listed on the Korean Stock Exchange (KSE) for the period of 1980-2006, the results showed that the types of international experience of Korean logistics firms are positively related to financial performance of logistic firms. This paper investigates the relationship between the depth of breadth of international experience based on organizational learning theory. The results of our longitudinal study suggest that the types of international experience promotes the organizational learning by exposing the firm to rich and diverse experiences, and consequently have positive impact on firm``s performance.
양영수(Young Soo Yang),박영렬(Young Ryeol Park),이재은(Jae Eun Lee) 한국경영사학회 2017 經營史學 Vol.84 No.-
본 연구에서는 1990년부터 2014년까지 전개된 한국기업의 중국 동북 3성에 대한 해외직접 투자가 역사적으로 어떻게 전개되어 왔으며, 어떤 특성을 보였는지를 살펴보고자 한다. 이를 위해서, 본 연구에서는 전략적 적합성(strategic fit)의 관점을 바탕으로 한국기업의 동북 3성 해외직접투자 패턴이 동북 3성의 환경 변화에 따라 어떻게 달라져 왔는지를 분석한다. 먼저 역사적 관점에서 동북 3성에 대한 한국기업들의 투자시기를 태동기(1990년~1998년), 성장기(1999년~2002년), 활성화기(2003년~2008년), 조정기(2009년~2014년)로 구분하였다. 이러한 시기적 구분은 한국기업의 해외직접투자에 영향을 미칠 수 있는 피투자국 중국의 제도와 정부정책의 큰 변화를 기준으로 하였다. 그리고 각 시기별로 한국기업의 산업별 특성, 기업규모별 특성, 투자목적별 특성, 투자형태별 특성, 설립형태별 특성, 투자지분율별 특성을 분석하였다. 분석결과, 한국기업들의 동북 3성에 대한 해외직접투자는 산업 측면에서 태동기, 성장기, 활성화기에는 2차 산업 위주의 특성을 보였으나 조정기에 들어서면서 3차 산업으로 변화하는 추세가 나타났다. 기업규모별 특성을 살펴보면, 태동기와 성장기에는 중소기업 위주의 투자가 진행되었으나, 활성화기와 조정기에는 대기업의 투자 비중이 늘어나는 것으로 나타났다. 또한, 태동기와 성장기에는 한국기업들이 동북 3성에 대한 투자 목적이 수출촉진이나 저임활용 목적이 주를 이루었으나 최근에는 현지시장 진출의 목적이 많아지고 있다. 투자형태는 동북 3성 투자 초기인 태동기에는 합작투자가 선호되었으나, 성장기, 활성화기, 조정기를 거쳐 단독투자의 형태를 선호하는 특성을 보였으며, 신규법인 설립에 있어서 대부분의 기업들이 전 기간에 걸쳐 인수를 통한 설립보다는 신설법인 설립의 형태로 투자를 하는 것으로 나타났다. 또한, 한국기업들의 투자자지분율은 100% 소유지분율의 형태를 띠는 것으로 나타났다. 본 연구의 결과는 전략적 적합성의 관점에서 동북 3성에 대한 한국기업의 해외 직접투자를 역사적으로 고찰해보고, 동북 3성의 정치적, 경제적 변화에 따라 한국기업들의 해외 직접투자 전략이 변화되어 왔음을 제시함으로써 의미 있는 경영사적 시사점을 제시할 수 있을 것으로 기대된다. This study examines the strategies of the foreign direct investment (FDI) made by the Korean firms to Dongbei area in China. From perspectives of business history and strategic fit, we categorize the Korean FDI into four stages: quickening stage (1990~1998), growth stage (1999~2002), vitalization stage (2003~2008), and adjustment stage (2009~2014). The classification of these periods is based on major changes in Chinese institutions and government policies that can affect foreign direct investment by Korean firms. In particular, we investigate the Korean FDI by characteristics along with stages categorization such as investment industry, firm size, investment motive, investment type, establishment type, and investment ownership. Our finding show that Korean FDI has been moving from manufacturing industries to service industries, and the size of firms also has been moving from small and medium corporation to large corporation. The motives of Korean FDI have been moving from export promotion and the use of low wage to entry into host market. The Korean FDI has been conducted by full ownership instead of the joint venture with partial ownership and preferred green field investment over acquisition.
한국 물류기업의 내부자원이 해외진출 선택에 미치는 영향 -자원 및 지식기반 관점을 중심으로-
양영수 ( Young Soo Yang ),이재은 ( Jae Eun Lee ) 한국해운물류학회(구 한국해운학회) 2014 해운물류연구 Vol.30 No.1
본 논문에서는 한국 물류기업의 내부자원(국내사업경험자원, 해외사업경험자원, 재무자원, 기술자원)이 해외시장 진출 선택에 미치는 영향을 자원 및 지식기반관점을 중심으로 규명하고 있다. 한국 상장기업들 중 수상 및 육상, 운송 서비스를 제공하는 물류기업들을 대상으로 1980년부터 2006년까지의 기간 동안 494개의 패널자료를 구축하여 이항 로지스틱 회귀분석을 실시한 결과는 다음과 같다. 첫째, 해외사업경험자원과, 재무자원, 기술자원이 풍부한 물류기업일수록 해외시장으로 진출하려는 경향이 있는 것으로 나타났다. 둘째, 국내사업경험자원이 풍부한 물류기업일수록 해외시장으로 진출하기 보다는 내수시장에 안주하려는 경향이 있는 것으로 나타났다. 한국 물류기업의 국제화 관련 선행연구가 부족한 점을 고려할 때, 본 논문은 자원 및 지식기반 관점에 근거하여 물류기업의 내부자원과 해외시장 진출선택 간의 관계를 규명하였다는 점에 의의가 있다. 또한 본 연구의 결과는 한국물류기업의 해외시장진출 선택의 의사결정에 있어 유용한 이론적·실무적 시사점을 제시할 수 있을 것으로 판단된다. This paper intends to analyze the determinants of internationalization choice of Korean logistics firms. Specifically, the research examines the effect of internal resources such as, domestic business experience resource, international experience resource, financial resource, and technological resource on internationalization of Korean logistics firms. Domestic business experience resource is measured as the age of the firm in years which represents the firm`s domestic operating experience. The international experience is measured as the proportion of export sales to the total sales at time t and the ratio of foreign sales to total sales are used as the proxy for the different stage of internationalization of firms. Financial resource is captured by debt to equity ratio and technological resource is measured by measured by research and development (R&D) expenses per employee. Based on resource based view (RBV) and knowledge based view (KVB), we presents four hypotheses. Hypothesis 1a suggests that Korean firm`s domestic business experience resource is negatively related to the internationalization Choice of Korean Logistics Firms. In contrast, hypothesis 1b anticipates that Korean firm`s international business experience resource is positively related to the internationalization Choice of Korean Logistics Firms. Hypothesis 2 and hypothesis 3 suggest that both financial resource and technological resource are positively related to the internationalization Choice of Korean Logistics Firms. Based on the sample of port logistics, land logistics, transportation service firms listed on the Korean Stock Exchange (KSE) for the period of 1980-2006, the results revealed that international business experience resource, financial resource, and technological resource is positively related to the internationalization of logistic firms. However, the domestic business experience resource is negatively related to the internationalization choice of logistics firms. This paper investigates the relationship between internal resources and internationalization based on resource and knowledge based view. This study suggests some theoretical and managerial implications for logistic firms of internationalization choices.