Reasonably completed state assessment of the self-anchored hybrid cable-stayed suspension bridge: An analytical algorithm

Kai Wang,Wen-ming Zhang,Jie Chen,Zhe-hong Zhang 국제구조공학회 2024 Structural Engineering and Mechanics, An Int'l Jou Vol.90 No.2

In order to solve the problem of calculating the reasonable completed bridge state of a self-anchored hybrid cable-stayed suspension bridge (SA-HCSB), this paper proposes an analytical method. This method simplifies the main beam into a continuous beam with multi-point rigid supports and solves the support reaction forces. According to the segmented catenary theory, it simultaneously solves the horizontal forces of the main span main cables and the stay cables and iteratively calculates the equilibrium force system on the main beam in the collaborative system bridge state while completing the shape finding of the main span main cable and stay cables. Then, the horizontal forces of the side span main cables and stay cables are obtained based on the balance of horizontal forces on the bridge towers, and the shape finding of the side spans are completed according to the segmented catenary theory. Next, the difference between the support reaction forces of the continuous beam with multiple rigid supports obtained from the initial and final iterations is used to calculate the load of ballast on the side span main beam. Finally, the axial forces and strains of each segment of the main beam and bridge tower are obtained based on the loads applied by the main cable and stay cables on the main beam and bridge tower, thereby obtaining analytical data for the bridge in the reasonable completed state. In this paper, the rationality and effectiveness of this analytical method are verified through a case study of a SA-HCSB with a main span of 720m in finite element analysis. At the same time, it is also verified that the equilibrium force of the main beam under the reasonably completed bridge state can be obtained through iterative calculation. The analytical algorithm in this paper has clear physical significance, strong applicability, and high accuracy of calculation results, enriching the shape-finding method of this bridge type.

Douglas-Peucker-Based Accelerated Similarity Measures for Massive AIS Trajectories

Kai WANG,Ryan Wen LIU,Yan LI,Maohan LIANG,Yi LIU,Jianhua WU,Jingxian LIU 국제이네비해양경제학회 2017 International Journal of e-Navigation and Maritime Vol.8 No.1

With the rapid development of the global economy, transport safety and security have become the key issues in maritime transportation all over the world. In practical applications, the Automatic Identification System (AIS)-based measurement of similarities between different vessel trajectories plays an important role in improving maritime transportation, e.g., maritime navigation, maritime supervision and management. However, the received AIS datasets are usually composed of a large amount of redundant information which could significantly increase the computational complexity. To deal with this problem, a Douglas-Peucker (DP)-based calculation method is introduced in this paper to accurately compress the spatio-temporal AIS trajectories while preserving the main geometrical structures. Based on the compressed trajectories, it is able to accelerate the Dynamic Time Warping (DTW) algorithm for the measurement of similarities between different vessel trajectories. In particular, the combination of DP and DTW has the capacity of significantly reducing the computational cost and guaranteeing the accuracy of similarity measures. The experimental results have demonstrated the superior performance of the proposed method in terms of computational cost and accuracy of similarity measures.

U.S. and Domestic Market Gains and Asian Investors’ Overconfident Trading Behavior

Wen-I Chuang,Bong-Soo Lee,Kai-Li Wang 한국재무학회 2011 한국재무학회 학술대회 Vol.2011 No.09

The overconfidence hypothesis put forward by Gervais and Odean (2001) predicts that if investors are overconfident, they trade more aggressively subsequent to market gains. To gain further insight into the hypothesis, we examine whether both U.S. and domestic market gains make Asian investors trade more aggressively in subsequent periods in their domestic markets. Consistent with the predictions of the theory, we find that both U.S. and domestic market gains make Asian investors trade with more overconfidence in bull markets, in periods of high investor sentiment, and in periods of extremely high market returns after controlling for the alternative theories in explaining the return-volume relation. Moreover, we find that further integration of Asian stock markets with U.S. stock markets after the Asian financial crisis in 1998 is an important reason for Asian investors’ response to U.S. market gains by trading with overconfidence. We also find that Asian investors exhibit more significant overconfident trading behavior in markets with a short-sale constraint than in markets without it.

THE IMPACT OF CO-CREATION ON PSYCHOLOGICAL WELL-BEING AND FUTURE CO-CREATION INTENTION: A CROSS-COUNTRY COMPARISONS BETWEEN UNITED KINGDOM, CANADA, AND AUSTRALIA

Kai-Yu Wang,Wen-Hai Chih,Hope Wilfred Banda,Dinarti Tarigan 글로벌지식마케팅경영학회 2023 Global Marketing Conference Vol.2023 No.07

This study investigates the effect of co-creation on psychological well-being and future co-creation intention on social media. Data were collected from the United Kingdom, Canada and Australia. Although the results suggest that the effects of co-creation on users may differ depending on context, they generally show that co-creation experience has a positive relationship with co-creation behavior, and that risk assessment moderates this relationship. Co-creation experience also has a positive relationship with psychological well-being, and co-creation behavior mediates this relationship. The results also confirm that co-creation behavior has a positive relationship with future co-creation intention, and co-creation behavior mediates the relationship between co-creation experience and future co-creation intention.

Calcium/calmodulin-dependent protein kinase II is involved in the transmission and regulation of nociception in naïve and morphine-tolerant rat nucleus accumbens

Kai Wen Xi,De Duo Chen,Xin Geng,Yan Bian,Min Xin Wang,Hui Bian 대한통증학회 2023 The Korean Journal of Pain Vol.36 No.2

Background: Synaptic plasticity contributes to nociceptive signal transmission and modulation, with calcium/ calmodulin-dependent protein kinase II (CaMK II) playing a fundamental role in neural plasticity. This research was conducted to investigate the role of CaMK II in the transmission and regulation of nociceptive information within the nucleus accumbens (NAc) of naïve and morphine-tolerant rats. Methods: Randall Selitto and hot-plate tests were utilized to measure the hindpaw withdrawal latencies (HWLs) in response to noxious mechanical and thermal stimuli. To induce chronic morphine tolerance, rats received intraperitoneal morphine injection twice per day for seven days. CaMK II expression and activity were assessed using western blotting. Results: Intra-NAc microinjection of autocamtide-2-related inhibitory peptide (AIP) induced an increase in HWLs in naïve rats in response to noxious thermal and mechanical stimuli. Moreover, the expression of the phosphorylated CaMK II (p-CaMK II) was significantly decreased as determined by western blotting. Chronic intraperitoneal injection of morphine resulted in significant morphine tolerance in rats on Day 7, and an increase of p-CaMK II expression in NAc in morphine-tolerant rats was observed. Furthermore, intra-NAc administration of AIP elicited significant antinociceptive responses in morphine-tolerant rats. In addition, compared with naïve rats, AIP induced stronger thermal antinociceptive effects of the same dose in rats exhibiting morphine tolerance. Conclusions: This study shows that CaMK II in the NAc is involved in the transmission and regulation of nociception in naïve and morphine-tolerant rats.

Surface nanocrystallization and its properties of a rare earth magnesium alloy induced by HVOF―SMB

Kai-dong Xu,Ji-na Wang,Ai-hua Wang,Hua Yan,Xiang-lin Zhang,Zao-wen Huang 한국물리학회 2011 Current Applied Physics Vol.11 No.3

The nanocrystalline microstructure in the surface of a rare earth magnesium alloy induced by a new process named HVOF―SMB (high velocity oxygen-fuel flame supersonic microparticles bombarding) has been characterized by means of X-ray diffractometry (XRD) and high-resolution transmission electron microscopy (HRTEM). The effects of HVOF―SMB on mechanical properties and corrosion resistance of the magnesium alloy have been investigated by microhardness distribution and polarization curves, and the cross-sectional observation of the treated Mg alloy sample has been characterized by optical microscopy (OM). Results showed that HVOF―SMB can induce surface nanocrystallization with a grain size level less than 20 nm at topmost surface layer, and the microhardness at the top surface layer increases up to about 170 HV_0.025 which is twice more than that of the substrate. The grain size increases as well as the microhardness decreases gradually with the depth varying from surface to substrate. The potentiodynamic polarization curves indicate that the HVOF―SMB treated surfaces show lower corrosion resistance in comparison with the untreated magnesium alloy in 3.5% NaCl solution. The underlying mechanism of the electrochemical properties on the nanocrystalline Mg-based alloy’s surface induced by severe plastic deformation in corrosion resistance is discussed.

Aerostatic instability mode analysis of three-tower suspension bridges via strain energy and dynamic characteristics

Wen-ming Zhang,Kai-rui Qian,Li Wang,Yao-jun Ge 한국풍공학회 2019 Wind and Structures, An International Journal (WAS Vol.29 No.3

Multispan suspension bridges make a good alternative to single-span ones if the crossed strait or river width exceeds 2-3 km. However, multispan three-tower suspension bridges are found to be very sensitive to the wind load due to the lack of effective longitudinal constraint at their central tower. Moreover, at certain critical wind speed values, the aerostatic instability with sharply deteriorating dynamic characteristics may occur with catastrophic consequences. An attempt of an in-depth study on the aerostatic stability mode and damage mechanism of three-tower suspension bridges is made in this paper based on the assessment of strain energy and dynamic characteristics of three particular three-tower suspension bridges in China under different wind speeds and their further integration into the aerostatic stability analysis. The results obtained on the three bridges under study strongly suggest that their aerostatic instability mode is controlled by the coupled action of the anti-symmetric torsion and vertical bending of the two main-spans’ deck, together with the longitudinal bending of the towers, which can be regarded as the first-order torsion vibration mode coupled with the first-order vertical bending vibration mode. The growth rates of the torsional and vertical bending strain energy of the deck after the aerostatic instability are higher than those of the lateral bending. The bending and torsion frequencies decrease rapidly when the wind speed approaches the critical value, while the frequencies of the anti-symmetric vibration modes drop more sharply than those of the symmetric ones. The obtained dependences between the critical wind speed, strain energy, and dynamic characteristics of the bridge components under the aerostatic instability modes are considered instrumental in strength and integrity calculation of three-tower suspension bridges.

Purification and Structural Analysis of Surfactin Produced by Endophytic Bacillus subtilis EBS05 and its Antagonistic Activity Against Rhizoctonia cerealis

Wen, Cai-Yi,Yin, Zhi-Gang,Wang, Kai-Xuan,Chen, Jian-Guang,Shen, Shun-Shan The Korean Society of Plant Pathology 2011 Plant Pathology Journal Vol.27 No.4

Bacillus subtilis EBS05, an endophytic bacteria strain isolated from a medicinal plant Cinnamomum camphor, can produce antagonistic compounds that effectively inhibit plant pathogenic fungi. The greenhouse experiments showed that wheat sharp eyespot disease (WSED) was reduced by 91.2%, 88.2% and 43.0% after the treatment with fermentation broth, bacteria-free filter and a fungicide fludioxonil, respectively. The culture broth of strain EBS05 can more effectively control WSED than can fludioxonil. The fermentation broth and bacteria-free filter ability to suppress WSED was not significantly different, suggesting that an active secreted substance played a major role in controlling WSED. Separation and purification of the active compounds was carried out by serial processes, including hydrochloric acid (pH 2.0) treatment, methanol extraction and Sephadex LH-20 column chromatography, silica gel column chromatography and reverse-phase high-pressure liquid chromatography (HPLC), respectively. The purified compounds, one of active peaks in the HPLC spectrum, were obtained from the collection. Analysis of the chemical structures by time-of-flight mass spectrometry (TOF-MS) and electrospray ionization mass spectrometry/mass spectrometry (ESI-MS/MS) showed that the active substances produced by the endophytic bacteria EBS05 are mixture of the ${\beta}$-hydroxy-C12~C15-$Leu^7$ surfactin A isomers with 1035.65 Da, 1021.64 Da, 1007.63 Da and 993.65 Da molecular weights, respectively.

Prevalence and Molecular Characterization of Intestinal Trichomonads in Pet Dogs in East China

Wen-Chao Li,Kai Wang,Wei Zhang,Jingjing Wu,You-Fang Gu,Xi-Chen Zhang 대한기생충학열대의학회 2016 The Korean Journal of Parasitology Vol.54 No.6

INVESTIGATING ANTECEDENTS OF BRAND VALUE CO-CREATION BEHAVIORS IN SOCIAL MEDIA BASED BRAND COMMUNITIES

Kai-Yu Wang,Yu-Ping Wu,Wen-Hai Chih 글로벌지식마케팅경영학회 2020 Global Marketing Conference Vol.2020 No.11