Browsing by Author "Lee, Chien-Ying"

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Improvement of luminescent uniformity via synthesizing the carbon nanotubes on a Fe-TiCo-deposited catalytic layer
(2007-02-01)
Cheng, Huang-Chung
;
Lai, Rui-Ling
;
Chang, Yao-Ren
;
Lin, Kao-Chao
;
Juan, Chuan-Ping
Uniformity has been considered to be one of the most important criteria for carbon nanotubes (CNTs) to be utilized as the emitters in field-emission displays (FEDs) or backlight units (BLUs). Using co-deposited Fe and Ti film as a catalyst, a uniform distribution of catalytic nanoparticles was obtained after hydrogen pretreatment as compared with nanoparticles obtained only using a pure Fe film. It might be attributed to the suppression of coalescence of the Fe nanoparticles in the codeposited Fe-Ti film during the CNTs growth. In addition, the length variation of the CNTs synthesized by thermal-chemical vapor deposition (thermal-CVD) was also remarkably Suppressed. This resulted in a significant improvement of the luminescent uniformity, and homogeneous light emission was obtained front the CNTs at 700 V.
Pillar-shaped carbon nanotubes by Ti-Fe codeposition
(2007)
Chang, Pei-Chi
;
Lai, Rui-Ling
;
Lee, Chien-Ying
;
Lin, Kao-Chao
;
Chen, Hsia-Wei
In this report, the pillar-shaped carbon nanotubes (CNTs) have been achieved by utilizing an Fe-Ti codeposited layer as catalyst in thermal chemical vapor deposition system (T-CVD). By adjusting the ratio of distance between neighboring pillars (R) to the pillar height (H) as 2.5, the field emission characteristics can be effectively improved by reducing the screening effect. The turn-on field was remarkably decreased to 0.95 V/um with a very high current of 4.98mA for a device with area of 0.02cm(2). The coefficient of variation (CV) of the emission current was as low as 20.59% at 800V for 3600sec.
Skiing Simulation Based on Skill-Guided Motion Planning
(2019-09-01)
Hu, Chen-Hui
;
Lee, Chien-Ying
;
Liou, Yen-Ting
;
Sung, Feng-Yu
;
Lin, Wen-Chieh
Skiing is a popular recreational sport, and competitive skiing has been events at the Winter Olympic Games. Due to its wide moving range in the outdoor environment, motion capture of skiing is hard and usually not a good solution for generating skiing animations. Physical simulation offers a more viable alternative. However, skiing simulation is challenging as skiing involves many complicated motor skills and physics, such as balance keeping, movement coordination, articulated body dynamics and ski-snow reaction. In particular, as no reference motions - usually from MOCAP data - are readily available for guiding the high-level motor control, we need to synthesize plausible reference motions additionally. To solve this problem, sports techniques are exploited for reference motion planning. We propose a physics-based framework that employs kinetic analyses of skiing techniques and the ski-snow contact model to generate realistic skiing motions. By simulating the inclination, angulation and weighting/unweighting techniques, stable and plausible carving turns and bump skiing animations can be generated. We evaluate our framework by demonstrating various skiing motions with different speeds, curvature radii and bump sizes. Our results show that employing the sports techniques used by athletes can provide considerable potential to generate agile sport motions without reference motions.