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조영삼(Young-Sam Cho),한혁섭(Houkseop Han),김완두(Wan-Doo Kim) 대한기계학회 2006 대한기계학회 춘추학술대회 Vol.2006 No.6
Nano-hairs, which can be found on the epidermis of Tokay gecko's toes, contribute to the adhesion by means of van der Waals force and capillary force. This structures have inspired many researchers to fabricate the attachable nano-structures. However, unfortunately, the efficiency of artificial nano-structures is not assurable sufficiently. Moreover, the mechanical parameters related with the nano-hair's attachment are not yet revealed qualitatively. In this study, we investigate the mechanical parameters which have influence on the ability of adhesive nano-hairs through numerical simulation considering only van der Waals force. For the numerical analysis, finite element method is utilized and van der Waals force, assumed as 12-6 Lennard-Jones potential, is implemented as the body force term in the finite element formulation.
요소망 구성이 편리한 3차원 MLS 기반 변절점요소 개발
조영삼(Young-Sam Cho),박종연(Jong-Youn Park) 대한기계학회 2008 대한기계학회 춘추학술대회 Vol.2008 No.11
In this study, we developed 3D MLS-based variable-node elements for easy meshing. These elements should be derived from 2D MLS-based variable-node elements and would be utilized as key elements of easy meshing technique we proposed. Using developed 3D MLS-based variable-node elements, we demonstrated several examples having complex configuration compared with conventional meshing technique. Moreover, we compared with the stress results of our model and conventional one.
조영삼(Young-Sam Cho),박현하(Hyun-Ha Park),김재현(Jae-Hyun Kim),김완두(Wan-Doo Kim) 대한기계학회 2008 대한기계학회 춘추학술대회 Vol.2008 No.5
Nano/micro column-array structures are usually suggested as dry adhesive structure due to enlargement of contact area between dry adhesive structure and substrate. For the fabrication of column-array structure, UV lithography, molding, and etching techniques are adopted. Because the critical scale of dry adhesive structures exists from hundreds nanometers to tens micrometer, every technique needs expensive mask or mold. In this study, we demonstrate that colloidal lithography, that is, a well-known etching technique using colloid as mask could be a promising fabrication technique for the dry adhesive structure with inexpensive mask.
다국적기업 해외자회사 현지 직원들의 인지된 CSR이 정서적 몰입을 통해 창의적 행동에 미치는 영향: 인지된 평가 공정성 및 인지된 직무 자율성의 조절효과
조영삼 ( Youngsam Cho ),이준엽 ( Junyeb Lee ) 한국국제경영학회 2013 國際經營硏究 Vol.34 No.3
The purpose of this research is to examine the effect of corporate social responsibility (CSR) activities of foreign subsidiary on Mexican employees’ creative behavior through their affective commitment. We also suggested perceived appraisal justice and perceived job autonomy as boundary conditions to facilitate the positive relation between affective commitment and creative behavior. Although previous researchers have mainly focused on the consequences of CSR activities at the firm level, few studies have investigated the employee perception of CSR activities of foreign subsidiary and creative behavior of employee at the individual level. Therefore, we paid attention to the effects of local CSR activities and internal institution factors of foreign subsidiary on creative behavior of local employees from the integrated perspective. Survey results from 192 local employees show that perceived CSR was positively related to affective commitment and then affective commitment was positively related to creative behavior. We confirmed the mediating effect of affective commitment between the relation. Also, each moderating effect of perceived appraisal justice and perceived job autonomy with affective commitment on creative behavior was significant. More specifically, the positive relations between affective commitment and creative behavior were significant only for high groups of perceived appraisal justice and perceived job autonomy. The findings provide beneficial theoretical and practical implications for the localization strategy of foreign subsidiaries of multinational corporations.
조영삼(Young-Sam Cho),전석기(Sukky Jun),임세영(Seyoung Im) 대한기계학회 2004 대한기계학회 춘추학술대회 Vol.2004 No.4
We propose a 2D 'crack' element for the simulation of propagating crack with minimal remeshing. A regular finite element containing the crack tip is replaced with this novel crack element, while the elements which the crack has passed are split into two transition elements. Singular elements can easily be implemented into this crack element to represent the crack-tip singularity without enrichment. Both crack element and transition element proposed in our formulation are mapped from corresponding master elements which are commonly built using the moving least-square (MLS) approximation only in the natural coordinate. In numerical examples, the accuracy of stress intensity factor K<SUB>I</SUB> is demonstrated and the crack propagation in a plate is simulated.
한국과 미국 종업원들의 조직몰입과 직무만족도에 미치는 변혁적 리더십과 거래적 리더십의 조절효과 비교
조영삼 ( Young Sam Cho(first Author) ),신만수 ( Mann Soo Shin(corresponding Author) ) 한국국제경영학회 2015 國際經營硏究 Vol.26 No.2
In this study, the effects of two leadership styles on organizational commitment (OC) and job satisfaction (JS) are compared across countries. Based on culturally endorsed implicit leadership theory (CLT), we developed and empirically tested a two-by-two matrix model to identify differences in leadership effectiveness depending on the cultural context. Bass (1985) argued that transformational leadership (TFL) is built on a base of transactional leadership (TSL); therefore, a positive moderating effect may exist between these two leadership types. However, House (1996) challenged that argument by insisting that TSL has a negative moderating effect on employee outcome. In this study, we suggest that the moderating effect of TSL may differ depending on the culture. The results of our analysis of four groups classified according to the perceptions of subordinate workers (315 Korean and 181 U.S. employees) of TFL and TSL styles showed highest values for both OC and JS in the high-TFL and high-TSL groups in the Korean sample, while values for the high-TFL and low-TSL groups were highest for U.S. employees. To elucidate these findings further, we investigated the moderating effects of various subdimensions of TFL and TSL. The results indicated that TFL and TSL had positive moderating effects on OC and JS in Korea. However, no such moderating effect was evident in the U.S. sample. These results were consistent with the results of the two-by-two matrix. The findings of this study provide important insight into how managers can lead Korean and U.S. employees more successfully.