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- 저자 : Qicai Wang (검색결과 4 건)
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Qicai Wang,Yuan Tao,Jie Yuan,Zhaohui Jiang,Zuowei Ding,Zhongwei Zhang,Zhao Jia,Jing Wang 한국섬유공학회 2019 Fibers and polymers Vol.20 No.4
Different sensations are generated when we touch textiles with different performance. The mechanical propertiesrelated to fabric touch have been studied for a long time, the relationship between which and the subjective feelings is wellunderstood. However, the cognitive mechanism of our brain on the tactile perception evoked by fabric touch were rarelystudied. The relationship between mechanical properties of fabrics and the brain response in different areas is the vacancy ofthe study but urgent problem. In our previous study, the advanced technology of fMRI was proved to be an effective tool fordetecting brain response evoked by tactile stimulation of fabric touch with high spatial resolution. Now in this study, furtherfMRI experiments were conducted to observe brain response when participants touched different fabrics using their fingers ina specified way, and the most widely recognized functional atlas, Brodmann’s area maps, were applied to locate the corticalactivations in functional areas. Activations in the participants’s brain in different Brodmann areas was compared with themechanical preperties of the fabric samples tested by the instruments of KES-FB. The results showed that activationinformation in the participants’ brain can distinguish the fabric samples very well. Activations in several Brodmann areas areclosely connected with different tactile preperties of the fabrics. Therefore, Brodmann’s area maps were proved to be a usefulfunctional atlas for cortical localization of tactile perception evoked by fabric touch.
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Peipei Wu,Shumei Wang,Qicai Chen,Lili Chen,Pengpeng Zhang,Juan Xiao,Xiaoxiao Chen,Meng Liu 연세대학교의과대학 2017 Yonsei medical journal Vol.58 No.1
Purpose: Elevation in serum alanine aminotransferase (ALT) levels is a biomarker for metabolic syndrome (MS); however, the relationshiphas not been fully investigated within the reference interval of ALT levels. Our objective was to explore the relationship between serum ALT levels within the reference interval and MS in Chinese adults. Materials and Methods: This cross-sectional study included 16028 adults, who attended routine health check-ups at Shengli OilfieldCentral Hospital from January 2006 to March 2012. The reference interval of serum ALT level was defined as less than 40 U/L. Logistic regression models and restricted cubic spline were used to evaluate the association of ALT with MS. Results: The prevalence of MS in the total population was 13.7% (6.4% for females and 18.4% for males). Multiple logistic regressionshowed that ALT levels were positively associated with MS after adjustment for potential confounding factors. The odds ratio of MS in the top quartile was 4.830 [95% confidence interval (CI): 2.980–7.829] in females and 3.168 (95% CI: 2.649–3.790) in males, compared with the ALT levels in the bottom quartile. The restricted cubic spline models revealed a positive non-linear dose-response relationship between ALT levels and the risk of MS in women (p for nonlinearity was 0.0327), but a positive linear dose-response relationship in men (p for nonlinearity was 0.0659). Conclusion: Serum ALT levels within the reference interval are positively associated with MS in a dose-response manner. ElevatedALT levels, even within the reference interval, may reflect early dysmetabolic changes.
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Method to Estimate Lateral Earth Pressure on High-Filled Cut-and-Cover Tunnels
Li Ma,Sheng Li,I-Hsuan Ho,Qicai Wang,Bentian Yu 대한토목학회 2020 KSCE JOURNAL OF CIVIL ENGINEERING Vol.24 No.3
High-filled cut-and-cover tunnels (HFCCTs) can be used in northwestern China to reclaim usable land. Because of the ultra-high backfill used in HFCCTs, the stress on the cut-and-cover tunnel (CCT) will change. However, The calculation method adopted at present for earth pressure usually result in either overestimation or underestimation. Different from vertical earth pressure, lateral earth pressure (LEP) can help stabilize the structure of HFCCTs. The current methods for estimating LEP rely mainly on Rankine’s theory or empirical formulas. Using conventional methods has led to errors between actual values and estimated values, and such deviation increases with an increase in the backfill height over the CCT. Due to the complex soil-arching effect, the current methods used for calculating LEP for HFCCTs need to be modified. These modifications need to consider characteristics of the CCT, mechanical properties of the backfill soil, and the geometry of the landform. In this work, several influential factors were identified through numerical analysis using the finite element method and propose four corresponding coefficients of modification: k0, the cross-sectional shape of the CCT; k1, the mechanical properties of the backfill; k2, the width of the CCT; and k3, the coupled effect of the slope angle and ratio of the width of the valley floor to the width of the CCT. Because current methods and specifications may overestimate the LEP for HFCCTs in valleys, a general equation was formulated for modifying the LEP coefficient. Also, this general modification equation was verified that agrees well with the numerical analysis results for different cases.
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Sheng Li,Yuchi Jianie,I-Hsuan Ho,Li Ma,Qicai Wang,Bentian Yu 대한토목학회 2020 KSCE JOURNAL OF CIVIL ENGINEERING Vol.24 No.6
The use of high-filled cut-and-cover tunnels (HFCCTs) provides an ideal solution for reclaiming usable land in northwestern China because of the unique landforms of the Loess Plateau. Different from traditional tunnel boring methods, the HFCCT is first constructed and then backfilled in layers in the trench. Due to the backfill above the cut-and-cover tunnel (CCT) is required in quantity, currently, the existed estimating methods of the earth pressure may not suit the high-filled constructions. The ability to estimate the load on such tunnels and high backfill projects is extremely important. Conceptually, the Marston-Spangler (M-S) theory for buried culverts may be used to estimate earth pressure on HFCCTs. However, the earth pressure would be quite different from that of buried culverts in terms of the backfill volume, cross-sectional shape of structure, and foundation conditions. This paper presents physical experiments and numerical investigations to verify the influence of cross-sectional shape (arch and rectangle) of CCTs, foundation settlement, and load reduction using expanded polystyrene (EPS) for the vertical earth pressure (VEP) distribution and vertical displacement around a CCT. The experimental results agree well with the numerical analysis results. Moreover, further comparisons were also made to analytical analysis based on M-S theory. The comparison results indicate that analytical solutions for buried culverts cannot be applied to HFCCTs directly. In order to obtain the earth pressure accurately, designers must consider many influential factors.
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