Line sampling in participating media

Participating media, such as fog, fire, dust, and smoke, surrounds us in our daily life. Rendering participating media efficiently has always been a challenging task in physically based rendering. Line sampling has been derived to be an alternative method in direct lighting recently. Since line sampling takes visibility into account, it could reduce variance in the same render time compared to point sampling. We leverage the benefits of line sampling in the context of evaluating direct lighting in participating media. We express the direct lighting as a three-dimensional integral and perform line sampling in any one of them. We show how to apply multiple importance sampling (MIS) with common point samples, improving the robustness of estimators. We also show the drawbacks of MIS between different directions of lines. We demonstrate the efficiency of line sampling in participating media and discuss the results with different setups, such as different phase functions and occluder size

Traveling plane wave solutions of delayed lattice differential systems in competitive Lotka-Volterra type

99學年度楊定揮教師升等代表著作 100學年度研究獎補助論文[[abstract]]In this work we consider the existence of traveling plane wave solutions of systems of delayed lattice differential equations in competitive Lotka-Volterra type. Employing iterative method coupled with the explicit construction of upper and lower solutions in the theory of weak quasi-monotone dynamical systems, we obtain a speed, c *, and show the existence of traveling plane wave solutions connecting two different equilibria when the wave speeds are large than c *.[[incitationindex]]SCI[[booktype]]紙

TAO RESIDENTS\u27 PERCEPTIONS OF SOCIAL AND CULTRUAL IMPACTS OF TOURISM IN LAN-YU, TAIWAN

The purpose of this study was to investigate residents\u27 perceptions of the social and cultural impacts of tourism on Lan-Yu (Orchid Island). More specifically, this study examines Lan-Yu\u27s aboriginal residents\u27 (The Tao) perceptions of social and cultural impacts of tourism. Systematic sampling was the sampling procedure employed in this study. After the factor analysis, three underlying dimensions were found when examining Tao residents\u27 perceptions of social and cultural impacts of tourism, and they were named: positive cultural effects, negative cultural effects, and negative social effects. The results from the multivariate analysis of variance indicated that the Tao\u27s perceptions toward social and cultural impacts of tourism were different based on their educational level, employment status, income level, marital status, and length of residence. However, it was concluded that the Tao at this time do not perceive many impacts (either positive or negative) from the development of tourism on Lan-Yu

Enhanced Fuzzy Sliding Mode Control to MotionController of Linear Induction Motor Drives

[[abstract]]In this paper, an enhanced fuzzy sliding mode control system (EFSMC) is proposed for a linear induction motor (LIM) to achieve the position tracking. First, the dynamic model of LIM is investigated for considering the end effect and the friction force into the observer-based compensation design to cope with the time-varying uncertainties. Then, a sliding mode control (SMC) based on the backstepping control technique is presented with the combination of two fuzzy logic controllers. The first fuzzy logic controller is proposed, through a dynamic tune of the sliding surface slope constant of the SMC according to the controlled system states by a fuzzy logic unit. To relax the need of the upper bound of the lumped uncertainties in the SMC, the second fuzzy logic controller is presented, in which the upper bound of the lumped uncertainties can be estimated by a fuzzy inference mechanism. Finally, the experiments for several scenarios are conducted to demonstrate the effectiveness and robustness of the designed controller.[[conferencetype]]國際[[conferencedate]]20140711~20140713[[booktype]]電子版[[iscallforpapers]]

An Employment Profile of Bachelor of Arts Graduates in Statistics from Selected Universities in Taiwan, Since 1990

The purpose of this project was to develop an employment profile of Bachelor of Arts (B.A.) graduates in Statistics from selected universities in Taiwan, since 1990. To accomplish this purpose, a review of current literature regarding professional opportunities in the field of Statistics was conducted. Additionally, a survey instrument was developed and mailed to recent graduates awarded B.A. degrees in Statistics from universities in Taiwan. Survey results were reported and analyzed