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Thermal Problems and Methods in Invasive Microwave Coagulation Therapy
Qun Nan,Jianshu Peng,Youjun Liu,Yi Zengon 대한의료정보학회 2007 Healthcare Informatics Research Vol.13 No.2
Objective: To study some thermal problems in invasive microwave coagulation (IMC) therapy. Methods: Temperature fields predicts, limitation and remedy methods of the Pennes bioheat transfer equation during the temperature distribution analyses and how to kill a large anomalistic tumor for only once were discussed. Results: The coagulation area between the simulations and actual measured results showed good correspondence. Blood flow influenced the rise in temperature significantly. Conclusions: Thermal distribution with computer simulation in invasive microwave coagulation therapy is an accurate and reliable method. (Journal of Korean Society of Medical Informatics 13-2, 159-163, 2007)
Wen Xiong,Jianshu Ye,Xuemei Gai,C.S. Cai 국제구조공학회 2013 Structural Engineering and Mechanics, An Int'l Jou Vol.48 No.3
The present study fundamentally investigated the mechanical performance of the rib-stiffened super-wide bridge deck with twin box girders in concrete, which is a very popular application to efficiently widen the bridges with normal span. The shear lag effects of the specific cross-sections were firstly studied. The spatial stress distribution and local stiffness of the bridge deck with twin box girders were then investigated under several typical wheel load conditions. Meanwhile, a comparative study for the bridge deck with and without stiffening ribs was also carried out during the investigation; thereby, a design optimization for the stiffening ribs was further suggested. Finally, aiming at the preliminary design, an approximate methodology to manually calculate the bending moments of the rib-stiffened bridge deck was analytically proposed for engineers to quickly assess its performance. This rib-stiffened bridge deck with twin box girders can be widely applied for concrete (especially concrete cable-stayed) bridges with normal span, however, requiring a super-wide bridge width due to the traffic flow.
Analytical Solution on Highway U-shape Bridges using Isotropic Plate Theory
Wen Xiong,C. S. Cai,Jianshu Ye,Ying Ma 대한토목학회 2015 KSCE JOURNAL OF CIVIL ENGINEERING Vol.19 No.6
The U-shape bridge is one of the favorite designs possessing obvious advantages in lowing construction depth, especially in densely populated areas with an existing geographical layout of the transportation. The present study has developed an analytical solution on the isotropic plate theory basis for analyzing such concrete U-shape bridges. In this solution, the U-shape bridge is structurally regarded as an elastic thin plate with a boundary condition provided by two side girders. All the mechanical performances under different vertical loads including the self-weight can be given in forms of mathematic expressions, which should come handy especially during the preliminary stage of design. After accuracy verification, a parametric study was carried out to better understand and optimize the U-shape bridges in practice. The proposed solution is proved to be a time-saving solution with sufficient accuracy especially compared to the one commonly used based on the beam theory.
Intelligent cooling control for mass concrete relating to spiral case structure
Ning, Zeyu,Lin, Peng,Ouyang, Jianshu,Yang, Zongli,He, Mingwu,Ma, Fangping Techno-Press 2022 Advances in concrete construction Vol.14 No.1
The spiral case concrete (SCC) used in the underground powerhouse of large hydropower stations is complex, difficult to pour, and has high requirements for temperature control and crack prevention. In this study, based on the closed-loop control theory of "multi-source sensing, real analysis, and intelligent control", a new intelligent cooling control system (ICCS) suitable for the SCC is developed and is further applied to the Wudongde large-scale underground powerhouse. By employing the site monitoring data, numerical simulation, and field investigation, the temperature control quality of the SCC is evaluated. The results show that the target temperature control curve can be accurately tracked, and the temperature control indicators such as the maximum temperature can meet the design requirements by adopting the ICCS. Moreover, the numerical results and site investigation indicate that a safety factor of the spiral case structure was sure, and no cracking was found in the concrete blocks, by which the effectiveness of the system for improving the quality of temperature control of the SCC is verified. Finally, an intelligent cooling control procedure suitable for the SCC is proposed, which can provide a reference for improving the design and construction level for similar projects.
Multi-modal Medical Image Fusion Based on the Multiwavelet and Nonsubsampled Direction Filter Bank
Peng Geng,Xing Su,Tan Xu,Jianshu Liu 보안공학연구지원센터 2015 International Journal of Signal Processing, Image Vol.8 No.11
Aiming at solving the fusion problem of multimodal medical images, a novel medical image fusion algorithm is present in this paper. The multiwavelet is combined with the NSDFB to construct the proposed Multi-NSDFB transform. The source images can be decomposed into several lowpass coefficient and highpass coefficient. And all coefficients can be decomposed into four direction subbands. The modified spatial frequency is adopted to motivate the pulse coupled neural network to select the every direction subbands coefficients. Experiment results demonstrate that the proposed algorithm can not only extract more important visual information from source images, but also effectively avoid the introduction of artificial information. The present scheme outperforms the redundant discrete wavelet transform-based, and the Ripplet transform-based in terms of both visual quality and objective evaluation.
Identification of Bridge Scour Depth by Tracing Dynamic Behaviors of Superstructures
Wen Xiong,C.S. Cai,Bo Kong,Pingbo Tang,Jianshu Ye 대한토목학회 2018 KSCE JOURNAL OF CIVIL ENGINEERING Vol.22 No.4
A methodology to identify and analyze the bridge scour depth by tracing the dynamic behaviors of superstructures was developed. This proposed methodology basically relies upon the bridge scour-induced effects on the variations of two dynamic features ofsuperstructures, i.e., the natural frequency of vibration and mode of vibration. Firstly a flexibility matrix incorporating the twodynamic features is deduced for bridges under scour conditions. Then, using the scour-induced variations of such flexibility matrix, anew parameter of “[D]-based deflection change” Δδ is defined as an important index for identifying the scour depth. Such an indexΔδ is determined by both FEM (Finite Element Method) simulations and on-site measurements on the dynamic features ofsuperstructures. By doing this, the scour depths corresponding to the measured Δδ are back-deduced based on a pre-simulatedrelationship between Δδ and scour depths. A case study based on the simulation and a demonstration based on actual field data arefinally given to demonstrate the application procedure and qualitatively verify the feasibility of the proposed methodology. Thismethodology does not require any continuous and long-term bridge monitoring using underwater instrumentations and could beconveniently integrated to a routine assessment or structural monitoring system.