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Kai Zhang,Wenbo Zheng,Cong Xu,Shougen Chen 대한토목학회 2019 KSCE JOURNAL OF CIVIL ENGINEERING Vol.23 No.5
This paper presents an improved assessment system to evaluate the risk of water inrush in tunnels in carbonate karst terrain based on extension assessment method. This system considers the karst geological conditions and selects nine main factors as evaluation indices that influence the water inrush in tunnels. The evaluation indices are quantitatively graded into four risk grades based on their values or expert judgement. The same-feature matter-element, classical domains, and sectional domains are constructed based on the nondimensionalization of the risk grades of the evaluation indices. The integrated weights for the evaluation indices are composed of the objective weights computed from measured values and the subjective weights derived from the Fuzzy Analytical Hierarchy Process (FAHP). The water inrush risk level of the evaluation object is recognized by the correlation analysis. The variable characteristic value makes it possible to further distinguish the water inrush risk of different objects having the same risk level. The accuracy of the assessment results of this proposed extension assessment system was verified by applying it in two engineering cases. This extension assessment system provides a practical tool to assess the risk of water inrush in tunnels in carbonate karst terrain.
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Yin, Binfeng,Zheng, Wenshu,Dong, Mingling,Yu, Wenbo,Chen, Yiping,Joo, Sang Woo,Jiang, Xingyu The Royal Society of Chemistry 2017 The Analyst Vol.142 No.16
<P>We developed a competitive colorimetric nanosensor based on Au@Ag bimetallic nanoparticles for the detection of interleukin-6 (IL-6) in clinical samples. Antibody-conjugated magnetic nanoparticles (MNPs) and polystyrene (PS) microparticles conjugated with both catalase and a secondary antibody can form sandwich structures that enable one-step target enrichment and separation. The catalase on the surface of the PS can catalyze the hydrolysis of hydrogen peroxide (H2O2) to regulate the deposition of Ag<SUP>+</SUP> on the surface of gold nanoparticles (AuNPs), and forms different sizes and amounts of Au@Ag bimetallic nanoparticles (Au@AgNPs) which produce a distinct color signal for readout with the naked eye. Our sensor features high sensitivity, selectivity, reproducibility and anti-interference property as a result of comprehensive parameter optimization. The limit of detection of IL-6 can reach 11 pg mL<SUP>−1</SUP> with the naked eye and 1.2 pg mL<SUP>−1</SUP> by quantitative instrumental analysis. The whole analysis can be finished within 1 h. More importantly, we successfully apply our platform or the detection of IL-6 in clinical samples with better accuracy than conventional enzyme-linked immunosorbent assay (ELISA).</P>
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NUMERICAL PROJECTION ON OCCUPANT THERMAL COMFORT VIA DYNAMIC RESPONSES TO HUMAN THERMOREGULATION
Weijian Li,Jiqing Chen,Fengchong Lan,Xijiao Zheng,Wenbo Zeng 한국자동차공학회 2022 International journal of automotive technology Vol.23 No.1
With the different physiological properties and thermal conditions, different body parts of passengers have inconsistent thermal sensations and thermal requirements in a highly non-uniform and transient vehicle cabin thermal environment. Determining the thermal comfort requirements for different body parts of a passenger is essential for effectively supplying warm air to the right human part especially for electric vehicles with energy-saving attributes. In this paper, a comprehensive numerical model that integrates human thermal regulation mechanism and dynamic environmental characteristics is established to calculate the thermal comfort for passengers via thermal responses to a dynamic environment. The numerical computation sets up such a model structure, firstly considering human thermal regulation functions into the thermal response to the in-cabin dynamic thermal distributions, then combining Berkeley thermal comfort model to identify the thermal comfort level at different body parts, that would implement total numerical simulations to get thermal comfort evaluation, independent of human subjective feedbacks. The model is validated by experiments with an acceptable error and implemented for a cabin heating case study. The models can effectively predict the thermal comfort and thermal requirements of various body parts in a dynamic environment with human thermoregulation, as an important tool for designing a non-uniform environment.
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User-Oriented Energy- and Spectral- Efficiency Tradeoff for Wireless Networks
( Yueying Zhang ),( Hang Long ),( Yuexing Peng ),( Kan Zheng ),( Wenbo Wang ) 한국인터넷정보학회 2013 KSII Transactions on Internet and Information Syst Vol.7 No.2
Conventional optimization designs of wireless networks mainly focus on spectral efficiency (SE) as a performance metric. However, as diverse media services are emerging, a green wireless network, which not only meets the quality of experience (QoE) requirements for users and also improves energy efficiency (EE), is the most appropriate solution. In this paper, we firstly propose the unit QoE per Watt, which is termed QoE efficiency (QEE), as a user-oriented metric to evaluate EE for wireless networks. We then analyze which is the kind of wireless resource given priority to use under different scenarios to obtain an acceptable QEE. Particularly, power, delay and data-rate related to QoE are separately addressed for several typical services, such as file download, video stream and web browsing services. Next, the fundamental tradeoffs are investigated between QEE and SE for wireless networks. Our analytical results are helpful for network design and optimization to strike a good balance between the users perceived QoE and energy consumption.
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Improved Wideband Precoding with Arbitrary Subcarrier Grouping in MIMO-OFDM Systems
Hang Long,Kyeong Jin Kim,Wei Xiang,Shanshan Shen,Kan Zheng,Wenbo Wang 한국전자통신연구원 2012 ETRI Journal Vol.34 No.1
Precoding in the multiple-input multiple-output orthogonal frequency division multiplexing system is investigated. In conventional wideband precoding (WBP), only one precoder, obtained from the decomposition of the subcarrier independent channel matrix, is used for all subcarriers. With an investigation of the relationship between the subcarrier independent channel matrix and the temporal/frequency channels, an improved WBP scheme is proposed for practical scenarios in which a part of subcarriers are allocated to a user. The improved WBP scheme is a generalized scheme of which narrow-band precoding and conventional WBP schemes are special modes. Simulation results demonstrate that the improved WBP scheme almost achieves the optimum performance of a single precoder and outperforms the conventional WBP scheme in terms of the bit error ratio and ergodic capacity with slight complexity increase. The largest advantage of the improved WBP scheme on signal-to-noise ratio in simulation results is over 2.1 dB.
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