William Tsai - Academia.edu (original) (raw)

Papers by William Tsai

Journal of Endodontics, 1999

Thrombin is activated during vascular injury and inflammation of the dental pulp. In the present ... more Thrombin is activated during vascular injury and inflammation of the dental pulp. In the present study, we found that thrombin can stimulate the proliferation of pulp cells in a dose-dependent manner as analyzed by modified MTT assay. The cell number increased by 1.6, 1.77, and 2.14-fold over that of control after exposure to 5, 10, and 20 units/ml of thrombin for 5 days. Flow cytometry studies also found that thrombin (10 units/ml) can induce the cell cycle progression of pulp cells after 24 h of incubation, as revealed by increasing the proportion of cells in the S phase and the G2/M phase from 29 to 72%. Moreover, exposure to thrombin (> 5 units/ml) for 3 days led to marked clustering of pulp cells. We concluded that thrombin can regulate the growth, cell cycle progression, and functional reorganization of the pulp tissue during pulp healing and inflammatory processes.

International Journal of Machine Tools & Manufacture, 2006

In this study, the effects of various rolling conditions, such as inclined angle, offset angle, r... more In this study, the effects of various rolling conditions, such as inclined angle, offset angle, roll shapes, etc., upon the depth of the spiral marks on the surface of the rolled product and the rolling forces are discussed numerically by the finite element method. Experiments using a self-designed testing machine with work-rolls of three different kinds of roll shapes were conducted. The depth of the spiral marks was measured. From the comparisons between the analytical and experimental results, it is known that a smoother surface on the rolled product can always be obtained with convex-shaped rolls. Whereas, prominent spiral marks probably appear for two-stage conical rolls and spherical-headed rolls under an ill-set rolling condition. These analytical and experimental results can offer useful knowledge for the design of the roll shapes and the pass schedule during three-roll planetary rolling processes.

Journal of Business Venturing, 1991

EXECUTIVE of a corporate venture: culture, climate, and corporate support (Schon SUMMARY focuses ... more EXECUTIVE of a corporate venture: culture, climate, and corporate support (Schon SUMMARY focuses on the last of the above issues. It seeks to explore the importance of environment and strategy for corporate venture success.

Journal of Business Venturing, 1992

Mainland Chinese, Taiwanese and American entrepreneurs provides a special opportunity to explore ... more Mainland Chinese, Taiwanese and American entrepreneurs provides a special opportunity to explore this issue. For 50 years severe and unrelenting ideological pressures have been brought to bear on the base Chinese culture in these two countries. Therefore, we can start to uncover where culture predominates and where ideology predominates. Where culture predominates and endures: l Chinese and American entrepreneurs should show dSfSerent patterns of response l Taiwanese responses should be similar to Chinese responses Where culture is eroded rapidly by ideological forces, and is thus relatively malleable: l Taiwanese and American entrepreneurs should show similar patterns of response l Taiwanese responses should be more similar to American responses This study used survey data obtained from entrepreneurs in each of the three countries. Respondents were asked to indicate their degree of agreement to questions relating to 14 dtferent cultural 441 442 R.G. McGRATH ET AL

Journal of Endodontics, 1999

Thrombin is activated during vascular injury and inflammation of the dental pulp. In the present ... more Thrombin is activated during vascular injury and inflammation of the dental pulp. In the present study, we found that thrombin can stimulate the proliferation of pulp cells in a dose-dependent manner as analyzed by modified MTT assay. The cell number increased by 1.6, 1.77, and 2.14-fold over that of control after exposure to 5, 10, and 20 units/ml of thrombin for 5 days. Flow cytometry studies also found that thrombin (10 units/ml) can induce the cell cycle progression of pulp cells after 24 h of incubation, as revealed by increasing the proportion of cells in the S phase and the G2/M phase from 29 to 72%. Moreover, exposure to thrombin (> 5 units/ml) for 3 days led to marked clustering of pulp cells. We concluded that thrombin can regulate the growth, cell cycle progression, and functional reorganization of the pulp tissue during pulp healing and inflammatory processes.

International Journal of Machine Tools & Manufacture, 2006

In this study, the effects of various rolling conditions, such as inclined angle, offset angle, r... more In this study, the effects of various rolling conditions, such as inclined angle, offset angle, roll shapes, etc., upon the depth of the spiral marks on the surface of the rolled product and the rolling forces are discussed numerically by the finite element method. Experiments using a self-designed testing machine with work-rolls of three different kinds of roll shapes were conducted. The depth of the spiral marks was measured. From the comparisons between the analytical and experimental results, it is known that a smoother surface on the rolled product can always be obtained with convex-shaped rolls. Whereas, prominent spiral marks probably appear for two-stage conical rolls and spherical-headed rolls under an ill-set rolling condition. These analytical and experimental results can offer useful knowledge for the design of the roll shapes and the pass schedule during three-roll planetary rolling processes.

Journal of Business Venturing, 1991

EXECUTIVE of a corporate venture: culture, climate, and corporate support (Schon SUMMARY focuses ... more EXECUTIVE of a corporate venture: culture, climate, and corporate support (Schon SUMMARY focuses on the last of the above issues. It seeks to explore the importance of environment and strategy for corporate venture success.

Journal of Business Venturing, 1992

Mainland Chinese, Taiwanese and American entrepreneurs provides a special opportunity to explore ... more Mainland Chinese, Taiwanese and American entrepreneurs provides a special opportunity to explore this issue. For 50 years severe and unrelenting ideological pressures have been brought to bear on the base Chinese culture in these two countries. Therefore, we can start to uncover where culture predominates and where ideology predominates. Where culture predominates and endures: l Chinese and American entrepreneurs should show dSfSerent patterns of response l Taiwanese responses should be similar to Chinese responses Where culture is eroded rapidly by ideological forces, and is thus relatively malleable: l Taiwanese and American entrepreneurs should show similar patterns of response l Taiwanese responses should be more similar to American responses This study used survey data obtained from entrepreneurs in each of the three countries. Respondents were asked to indicate their degree of agreement to questions relating to 14 dtferent cultural 441 442 R.G. McGRATH ET AL