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RISS 인기검색어
- 검색키워드
- 저자 : Chien-Hsun Huang (검색결과 3 건)
- 무료
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A Methodology to Build a Groutability Formula via a Heuristic Algorithm
Chien-Lin Huang,Jen-Chen Fan,Kuo-Wei Liao,Tsung-Hsun Lien 대한토목학회 2013 KSCE JOURNAL OF CIVIL ENGINEERING Vol.17 No.1
The goal of this study is to provide a methodology to develop a groutability (N) formula of sandy silt soils using microfine cement grouts in a permeation grouting. Because the Fines Content (FC) of the sandy silt soils studied is relatively high, and the size of the grouts used is significantly smaller than the Portland cement, the existing empirical formulas cannot deliver a promising prediction of N. Support Vector Machines (SVMs) is an alternative tool used to predict N. However, SVMs do not provide an explicit formula,which creates an obstacle for practical engineers. Thus, a heuristic algorithm (the Tabu search, TS) was used to build the prediction formula. A total of 240 in-situ data samples were analyzed to ensure the accuracy of the proposed formula. The format of the existing empirical formula was adopted in the proposed TS-based formula. Four parameters were considered in our TS models: the effective soil particle size (D10), the soil particle size (D15), the water-to-cement ratio (w/c) and the FC. The prediction accuracy of the TSbased formula was approximately 94.17%, indicating that the proposed formula is a suitable tool. Because the proposed formula has a similar format to that of formulas that are typically used, the proposed approach can be implemented readily in practical engineering settings. Note that the proposed formula was only verified by the collected data samples, the suitability of applying the built formula to other conditions needs more investigation.
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Yu-Fan Lin,Chien-Ying Wang,Yen-Hsun Huang,Sheng-Min Lin,Ying-Ying Yang 한국보건의료인국가시험원 2022 보건의료교육평가 Vol.19 No.-
Purpose Endotracheal intubation and central venous catheterization are essential procedures in clinical practice. Simulation-based technology such as smart glasses has been used to facilitate medical students’ training on these procedures. We investigated medical students’ self-assessed efficacy and satisfaction regarding the practice and training of these procedures with smart glasses in Taiwan. Methods This observational study enrolled 145 medical students in the 5th and 6th years participating in clerkships at Taipei Veterans General Hospital between October 2020 and December 2021. Students were divided into the smart glasses or the control group and received training at a workshop. The primary outcomes included students’ pre- and post-intervention scores for self-assessed efficacy and satisfaction with the training tool, instructor’s teaching, and the workshop. Results The pre-intervention scores for self-assessed efficacy of 5th- and 6th-year medical students in endotracheal intubation and central venous catheterization procedures showed no significant difference. The post-intervention score of self-assessed efficacy in the smart glasses group was better than that of the control group. Moreover, 6th-year medical students in the smart glasses group showed higher satisfaction with the training tool, instructor’s teaching, and workshop than those in the control group. Conclusion Smart glasses served as a suitable simulation tool for endotracheal intubation and central venous catheterization procedures training in medical students. Medical students practicing with smart glasses showed improved self-assessed efficacy and higher satisfaction with training, especially for procedural steps in a space-limited field. Simulation training on procedural skills with smart glasses in 5th-year medical students may be adjusted to improve their satisfaction.
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Numerical investigation into dynamic behavior of adjustable preload double-nut ball screw
Chuen-Ren Wang,De-Shin Liu,Chien-Hsun Huang,Ting-Nung Shiau 대한기계학회 2016 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.30 No.10
The dynamic behavior of a double-nut ball screw was investigated by means of ABAQUS 6.13© simulations based on a threedimensional model. The validity of the numerical model was demonstrated by comparing the simulation results obtained for the reaction force and torque acting on the flange of the nut with the experimental results. We found that the two sets of results deviated by no more than 5.87% given a screw rotating speed of 100 rpm. Simulations were performed to investigate the effects of the spacer width, screw rotating speed, steel ball radius and axial force on the torque acting on the nut flange. The results show that the torque increases with an increasing spacer width due to an increasing preload force. Moreover, the torque increases as the screw rotating speed increases to 700 rpm, but decreases at higher rotating speeds due to a greater centrifugal force. Ball wear prompts a reduction in the preload force and thus reduces disproportionately the torque acting on the flange following extended operation. For higher axial loads (> 100 N), the torque remains approximately constant during run-in (0.025~0.2 s). However, for lower loads, notable fluctuations in the torque occur.
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