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A Study on Geometry Design of Spiral Bevel Gears based on Conjugate Curves
Bingkui Chen,Dong Liang,Zhaoyang Li 한국정밀공학회 2014 International Journal of Precision Engineering and Vol. No.
A study on geometry design of spiral bevel gears based on conjugate curves is put forward in this paper. According to the theory of conjugate curves, generation principle and mathematical model of spiral bevel gears are developed for a given spiral bevel curve. The meshing equation in the given contact position for conjugate curves is derived. Tubular meshing surfaces contacting along the orientation of designated contact angle are proposed to build up the circular-arc tooth profiles, which inherit all properties of conjugate curves. Numerical example is illustrated for this research including the computerized simulation of three dimensional models and analysis of meshing characteristics. Theoretical and numerical results demonstrate the feasibility and correctness of conjugate curves theory. Compared with general spiral bevel gears, this novel gear is different in the viewpoints of meshing and generation principles. And it is expected to have more excellent transmission performance which will be further studied in future.
Use of High-performance Graphics Processing Units for Power System Demand Forecasting
Ting He,Ke Meng,ZhaoYang Dong,Yong-Taek Oh,Yan Xu 대한전기학회 2010 Journal of Electrical Engineering & Technology Vol.5 No.3
Load forecasting has always been essential to the operation and planning of power systems in deregulated electricity markets. Various methods have been proposed for load forecasting, and the neural network is one of the most widely accepted and used techniques. However, to obtain more accurate results, more information is needed as input variables, resulting in huge computational costs in the learning process. In this paper, to reduce training time in multi-layer perceptron-based short-term load forecasting, a graphics processing unit (GPU)-based computing method is introduced. The proposed approach is tested using the Korea electricity market historical demand data set. Results show that GPU-based computing greatly reduces computational costs.
Lakshmanan, Meiyappan,Zhang, Zhaoyang,Mohanty, Bijayalaxmi,Kwon, Jun-Young,Choi, Hong-Yeol,Nam, Hyung-Jin,Kim, Dong-Il,Lee, Dong-Yup American Society of Plant Biologists 2013 PLANT PHYSIOLOGY - Vol.162 No.4
<P><I>A metabolic/regulatory network of rice incorporates two important tissue types, germinating seeds and photorespiring leaves, is validated through experiments with rice suspension cultures, and applied to analyze metabolic capability under flooding and drought conditions.</I></P>
Sagittal Pelvic Radius in Low-Grade Isthmic Lumbar Spondylolisthesis of Chinese Population
Zhao, Yang,Shen, Cai-Liang,Zhang, Ren-Jie,Cheng, Da-Wei,Dong, Fu-Long,Wang, Jun The Korean Neurosurgical Society 2016 Journal of Korean neurosurgical society Vol.59 No.3
Objective : To investigate the variation of pelvic radius and related parameters in low-grade isthmic lumbar spondylolisthesis. Methods : Seventy-four patients with isthmic lumbar spondylolisthesis and 47 controls were included in this study. There were 17 males and 57 females between 30 and 66 years of age, including 30 with grade I slippages and 44 grade II slippages; diseased levels included 34 cases on L4 and 40 cases on L5. Thoracic kyphosis (TK), the pelvic radius (PR), the pelvic angle (PA), pelvic morphology (PR-S1), and total lumbopelvic lordosis (PR-T12) were assessed from radiographs. Results : Statistically significant differences were found for the PA, PR-T12, and PR-S1 ($24.5{\pm}6.6^{\circ}$, $83.7{\pm}9.8^{\circ}$, and $25.4{\pm}11.2^{\circ}$, respectively) of the patients with spondylolisthesis and the healthy volunteers ($13.7{\pm}7.8^{\circ}$, $92.9{\pm}9.2^{\circ}$, and $40.7{\pm}8.9^{\circ}$, respectively). The TK/PR-T12 ratios were between 0.15 and 0.75. However, there were no differences in all the parameters between the L4 and L5 spondylolysis subgroups (p>0.05). The TK and PR-S1 of grade II were less than grade I, but the PA was greater. The PR-T12 of female patients were less than male patients, but the PA was greater (p<0.05). Conclusion : Pelvic morphology differed in patients with low-grade isthmic lumbar spondylolisthesis compared to controls. Gender and the grade of slippage impacted the sagittal configuration of the pelvis, but the segment of the vertebral slip did not. Overall, the spine of those with spondylolisthesis remains able to maintain sagittal balance despite abnormal pelvic morphology.