http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
자기희생적 리더십과 정보기술이 기술혁신을 통해 혁신행동에 미치는 영향에 관한 연구
유대원,서영욱 한국지식정보기술학회 2016 한국지식정보기술학회 논문지 Vol.11 No.5
Small and medium enterprises (SMEs) make a significant contribution to economic growth in korea. The purpose of this study is to examine an effects of self-sacrificial leadership and information technology on innovative behavior through technological innovation in SMEs. Self-sacrificial leadership and information technology are the two core factors in SMEs. Hence, we examined how they might influence technological innovation of exploitation and exploration. Moreover, we investigated how exploitation and exploration in technological innovation might be related to innovative behavior. A total of 252 completed questionnaires were collected from employees in SMEs, and a financial incentive was provided to participants. To test the hypotheses our research model was analyzed with the Partial Least Square method. The results reveal that all paths are statistically significant except H1 (job assignment → technological innovation of exploration ) and H4 (allocation of reward → technological innovation of exploitation). Self-sacrificial leadership by job assignment positively influenced technological innovation of exploitation, and self-sacrificial leadership by allocation of reward positively influenced technological innovation of exploration in SMEs. In addition utilization ability and infrastructure of information technology have positive effects on technological innovation of exploitation and exploration. Technological innovation of exploitation and exploration positively influenced innovative behavior. We confirmed the importance of self-sacrificial leadership, information technology, and technological innovation in SMEs.
유대원,Yoo, Dae-Won 한국금형공학회 2020 한국금형공학회지 Vol.14 No.4
The seal plays a role in preventing oil leakage when the lip and the rotating shaft come into contact with the fluid and air pressure. Recently, micro dimples or micro pockets are processed and used on the lubrication surfaces of thrust bearings, mechanical bearings, and piston rings. Compared to a smooth surface, micro dimples reduce friction and increase the life of parts. This paper analyzed various kinds of micro dimple shapes on the sealing surface, i.e. circle, rectangle, triangle, and trapezoid. For this purpose, Introduced the design of experiments to work out a micro dimple configuration, unlikely to be damaged from cracks and low in contact stress. As a result, the triangular dimple showed the best results. Optimal factors were dimple size 0.15 mm, dimple depth 0.0383 mm, dimple density 40%, and the maximum equivalent stress was 9.1455 MPa, and the maximum contact pressure was 9.6612 MPa. This paper analyzed the optimal shape of dimples by finite element analysis. As a research project, experiments and comparative analysis of micro dimple shapes are needed.
유대원,강병석,서영욱 한국인터넷전자상거래학회 2016 인터넷전자상거래연구 Vol.16 No.5
Today, as many small and medium-sized businesses are placed in unpredictable and uncertain external environment, they started to recognize the importance of effective response and change management for survival. From the position of small and medium-sized businesses, transformational leadership and information system quality are crucial factors in an effective response to the changes in the environment. Moreover, how fast small and medium-sized companies generate, share, and utilize new information through the organization’s capabilities for survival and improvement in competitiveness is an important concern. The study aims to find out the correlation between transformational leadership, information system quality, dynamic capability and management performance for the survival and prosperity of small and medium-sized enterprises. In line with this, a comprehensive empirical analysis was done on the impact of transformational leadership and information system quality on the management performance through dynamic capability. A survey was conducted on small and medium-sized enterprises located all over the country and 252 valid data among them were analyzed using PLS. The results showed that transformational leadership and information system quality gave a significant positive impact on dynamic capability and that dynamic capability also influenced management performance positively. The findings were organized and implications of the findings were deducted.
유대원(Dae Won Yoo),이재학(Jai Hak Lee) 대한기계학회 2013 大韓機械學會論文集A Vol.37 No.11
휠 로더는 다양한 작업이 가능한 건설장비 중의 하나로서, 기능적 다양성과 구조적 신뢰성 향상의 요구가 증대되고 있다. 휠 베어링은 로더의 수명을 결정하는 핵심부품 중 하나이며, 테이퍼 롤러 베어링이 사용되고 있다. 일반적인 베어링 수명은 하중과 회전속도로 계산되고 있다. 테이퍼 롤러 베어링의 초기 예압은 내구수명에 직접적인 영향을 미치는 중요한 인자이다. 본 논문은 테이퍼 롤러 베어링에 작용하는 하중, 회전속도, 열 변형에 따른 초기 예압량을 포함한 내구수명 및 예압특성 관계를 제시하였다. 사용온도가 100 라면, 상온에 비해 과다 예압 상태가 되며, 내구수명은 약 20.3% 감소하는 결과를 나타내었다. A wheel loader is a type of construction machinery that is capable of performing a variety of tasks, and demands on its functional diversity and structural reliability are growing. A wheel bearing is one of the core components that determine the life of the loader; taper roller bearings are commonly used for this purpose. The lifetime of a bearing is typically calculated based only on its load and revolution speed. The initial preload of a taper roller bearing is a critical factor that directly affects its endurance life. In this study, the relations between the endurance life and preload characteristics including the amount of preload according to the weight, rotational speed, and thermal modification applied to tapered roller bearings are presented. When the temperature is 100°C, an excessive preload condition is expected compared with that at room temperature, and the durable life decreases by 20.3 %.
유대원(Dae-Won Yoo),이재학(Jai-Hak Lee) 대한기계학회 2009 大韓機械學會論文集A Vol.33 No.9
Parallel Kinematic Mechanism (PKM) is a device to perform the various motion in three-dimensional space and it calls for six degree of freedom. For example, Parallel Kinematic Mechanism is applied to machine tools, medical equipments, MEMS, virtual reality devices and flight motion simulators. Recently, many companies have tried to develop new Parallel Kinematic Mechanism in order to improve the cycle time and the precisional tolerance. Parallel Kinematic Mechanism uses general universal joint and spherical joint, but such joints have accumulated tolerance problems. Therefore, it causes position control problem and dramatically life time reduction. This paper focused on the rolling element to improve sliding precision in new sliding ball joint development. Before the final design and production, it was confirmed that new sliding ball joint held a higher load and a good geometrical structure. FEM analysis showed a favorable agreement with tensile and compressive testing results by universal testing machine. In conclusions, a new sliding ball joint has been developed to solve a problem of accumulated tolerance and verified using tensile and compressive testing as well as FEM analysis.