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- 저자 : Yao-Hsin Wen (검색결과 6 건)
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Tests of reinforced concrete deep beams
Wen-Yao Lu,Hsin-Tai Hsiao,Chun-Liang Chen,Shu-Min Huang,Ming-Che Lin 사단법인 한국계산역학회 2015 Computers and Concrete, An International Journal Vol.15 No.3
This study reports the test results of twelve reinforced concrete deep beams. The deep beams were tested with loads applied through and supported by columns. The main variables studied were the shear span-to-depth ratios, and the horizontal and vertical stirrups. The shear strengths can be effectively enhanced for deep beams reinforced with both horizontal and vertical stirrups. The test results indicate the shear strengths of deep beams increase with the decrease of the shear span-to-depth ratios. The normalized shear strengths of the deep beams did not increase proportionally with an increase in effective depth. An analytical method for predicting the shear strengths of deep beams is proposed in this study. The shear strengths predicted by the proposed method and the strut-and-tie model of the ACI Code are compared with available test results. The comparison shows the proposed method can predict the shear strengths of reinforced concrete deep beams more accurately than the strut-and-tie model of the ACI Code.
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High-strength concrete deep beams with web openings strengthened by carbon fiber reinforced plastics
Wen-Yao Lu,Hsin-Wan Yu,Chun-Liang Chen,Shen-Lung Liu,Ting-Chou Che 사단법인 한국계산역학회 2015 Computers and Concrete, An International Journal Vol.15 No.1
The objective of this study is to examine the effect of carbon fiber reinforced polymer (CFRP) on the shear strengths of deep beams with web openings. A total of 18 high-strength concrete deep beams with web openings were tested. Twelve were externally wrapped with four layers of CFRP, six of them strengthened in the horizontal direction and the others in the vertical direction. The parameters of the configuration of CFRP, the sizes of the openings and the locations of the openings were covered in this study. The test results indicates the shear strengths of deep beams with openings sized 60×40 mm were about 16% higher than that with openings sized 68×68 mm. For deep beams with openings sized 60×40 mm, the lower the locations of openings the higher the shear strengths were. The test results also indicate the shear strengths of deep beams with web openings strengthened by CFRP wrapped in the vertical direction can be enhanced by about 10%. However, the shear strengths of deep beams with web openings strengthened by CFRP wrapped in the horizontal direction can only be enhanced by about 6%. The shear strengths of deep beam, with different size and location of web openings and strengthened by different configuration of CFRP can be reasonably predicted by the empirical formulas of Kong and Sharp.
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Evaluating Permeability and Efficiency of Substrates by Using Permeation Grouting Sand Column Test
Jen-Chen Fan,Wen-Yao Liu,Che-Hsin Liu,Chien-Lin Huang,Yun-Wei Tan,Jia-Jun Guo 대한토목학회 2018 KSCE JOURNAL OF CIVIL ENGINEERING Vol.22 No.8
This study design the sand column tests in the laboratory to evaluate permeability and efficiency of substrates by using permeationgrouting technology. The results show, the coarser the test sand and the lower the substrates viscosity, the better the grouting effect. Ifmore than 5% fines added will affect the grouting results significantly. Spearman’s rank correlation coefficient and stepwiseregression method were applied to analysis 36 sets of sand columns testing results. The relationships among the effective size of testsand (D10), the viscosity of substrates and grouting height, grouting time, grouting rate and outflow rate were obtained. The results ofthis study might be helpful for applying the permeation grouting technology to remedy the contaminated groundwater in the field.
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Bioactive Cadinane-type Compounds from the Soft Coral Sinularia scabra
Jyh-Horng Sheu,Jui-Hsin Su,Chiung-Yao Huang,Po-Ju Li,Yi Lu,Zhi-Hong Wen,Yao-Haur Kao 대한약학회 2012 Archives of Pharmacal Research Vol.35 No.5
Two new cadinane-type sesquiterpenoids, scabralins A (1) and B (2) were obtained from the soft coral Sinularia scabra. Metabolite 1 was shown to exhibit moderate to weak cytotoxicity against MCF-7, WiDr, Daoy, and HEp 2 cancer cell lines. Also, incubation with 10 μM compound 1 significantly inhibited the accumulation of the pro-inflammatory inducible nitric oxide synthase protein in lipopolysaccharide-stimulated RAW264.7 macrophage cells.
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Su Vincent Yi-Fong,Ko Szu-Wen,Chang Yuh-Lih,Chou Yueh-Ching,Lee Hsin-Chen,Yang Kuang-Yao,Chou Kun-Ta,Hsu Chia-Chen 대한천식알레르기학회 2022 Allergy, Asthma & Immunology Research Vol.14 No.3
Purpose: Current clinical guidelines are unclear regarding the association of cardiovascular medication with the risk of acute exacerbation (AE) in patients with asthma-chronic obstructive pulmonary disease (COPD) overlap (ACO). Methods: We conducted a retrospective cohort study by interrogating the claims database of Taipei Veterans General Hospital. Patients with coexistent fixed airflow limitation and asthma were enrolled as an ACO cohort between 2009 and 2017. Exposure to cardiovascular medications, including angiotensin converting enzyme inhibitors (ACEIs), angiotensin II receptor blockers (ARBs), non-selective beta-blockers, cardioselective beta-blockers, dihydropyridine (DHP) calcium channel blockers (CCBs), and non-DHP CCBs, in 3-month period each served as time-dependent covariates. Patients receiving a cardiovascular medication ≥ 28 cumulative daily doses were defined as respective cardiovascular medication users. Patients were followed up until December 31, 2018. The primary endpoint was severe AE, defined as hospitalization or emergency department visit for either asthma, COPD, or respiratory failure. The secondary outcome was moderate AE. Results: The final study cohort consisted of 582 ACO subjects, with a mean follow-up period of 2.98 years. After adjustment, ARB (hazard ratio [HR], 0.64, 95% confidence interval [CI], 0.44–0.93, P = 0.019), cardioselective beta-blocker (HR, 0.29, 95% CI, 0.11–0.72, P = 0.008) and DHP CCB (HR, 0.66, 95% CI, 0.45–0.97, P = 0.035) therapies were associated with lower risks of severe AE. ARB (HR, 0.42, 95% CI, 0.30–0.62, P < 0.001) and DHP CCB (HR, 0.55, 95% CI, 0.38–0.80, P = 0.002) therapies were associated with lower risks of moderate AE. Cardioselective beta-blockers, ARBs, and DHP CCBs were associated with lower risks of severe AE in frequent exacerbators. ACEI, non-selective beta-blocker, or non-DHP CCB use did not change the risk of severe AE. Conclusions: ARB, cardioselective beta-blocker, and DHP CCB therapies may lower the risk of AE in patients with ACO.
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Quadrature Oscillators with Grounded Capacitors and Resistors Using FDCCIIs
Jiun-Wei Horng,Chun-Li Hou,Chun-Ming Chang,Hung-Pin Chou,Chun-Ta Lin,Yao-Hsin Wen 한국전자통신연구원 2006 ETRI Journal Vol.28 No.4
Two current-mode and/or voltage-mode quadrature oscillator circuits each using one fully-differential secondgeneration current conveyor (FDCCII), two grounded capacitors, and two (or three) grounded resistors are presented. In the proposed circuits, the current-mode quadrature signals have the advantage of high-output impedance. The oscillation conditions and oscillation frequencies are orthogonally (or independently) controllable. The current-mode and voltage-mode quadrature signals can be simultaneously obtained from the second proposed circuit. The use of only grounded capacitors and resistors makes the proposed circuits ideal for integrated circuit implementation. Simulation results are also included.
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