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- 저자 : Wang Xiaowei (검색결과 56 건)
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An Xiaowei,Li Huimin,Omoleye Ojuri,Wang Zhuofu,Ding Jiyong 대한토목학회 2018 KSCE JOURNAL OF CIVIL ENGINEERING Vol.22 No.7
Design optimization is an effective strategy to reduce construction project costs. This study focuses on the benefit of designoptimization, which should be allocated to the designer. Furthermore, the distribution ratio can be determined through negotiation. Inline with this view, this paper initially analyzed the benefits of engineering design optimization and the basic mechanism of itsdistribution. Second, we established the negotiation model of design optimization profit distribution by considering the fairnessconcern behavior of subjects. Finally, we set up the following three experimental scenarios: the designer solely has fairness concernbehavior, the owner exclusively has fairness concern behavior, and both negotiators have fairness concern behavior. From theengineering projects perspectives, we further analyzed the effects of the fairness concerns of both negotiators in terms of engineeringdesign optimization and negotiation performance using negotiation simulation experiments. Our experimental scenarios results showthat the appropriate behavior of fairness concerns by the two negotiators is valuable in improving their own advantages. However,excessive attention to the behaviors of fairness concerns by the two negotiators may lead to an increase in the negotiation cycle,which is not beneficial in attaining optimization. This study aims to provide references for the construction project management.
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Xiaowei Wang,Jiaxing Ren,Xinyu Hu,Xingyu Gu,Ning Li 대한토목학회 2021 KSCE JOURNAL OF CIVIL ENGINEERING Vol.25 No.6
The compaction characteristics of porous asphalt (PA) mixtures are significantly different from those of traditional dense-graded asphalt mixtures. Compaction efforts are critical for PA mixtures to exhibit good performance in terms of strength, functionality, and durability. The objective of this study was to determine the optimum number of gyrations for typical PA mixtures compacted using a Superpave gyratory compactor. The compaction characteristics and the influence of seven gyration levels on the indicators of air voids (AV) content, Marshall Stability (MS), multi-directional permeability, stone-on-stone contact, and durability of PA mixture were investigated through laboratory experiments. A multi-directional permeameter was designed to evaluate the multi-directional permeability of PA mixtures, including vertical, horizontal, and combined horizontal-vertical permeability. The AV content, multi-directional permeability decreases with the increasing gyrations. Based on the requirements of each indicator, the minimum and maximum gyrations for each indicator were determined. Balancing the performance of strength, functionality, and durability, the optimum number of gyrations for the PA mixtures was determined to be between 45 and 75 gyrations, which allows for different gyrations depending on the application of the PA mixture. Finally, the requirements of MS, horizontal permeability, and combined horizontal-vertical permeability are recommended for improving the performance of PA mixture.
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Secure Connectivity Probability of Multi-hop Clustered Randomize-and-Forward Networks
Xiaowei Wang,Zhou Su,Guangyi Wang 한국전자통신연구원 2017 ETRI Journal Vol.39 No.5
This work investigates secure cluster-aided multi-hop randomize-and-forward networks. We present a hop-by-hop multi-hop transmission scheme with relay selection, which evaluates for each cluster the relays that can securely receive the message. We propose an analytical model to derive the secure connectivity probability (SCP) of the hop-by-hop transmission scheme. For comparison, we also analyze SCPs of traditional end-to-end transmission schemes with two relay-selection policies. We perform simulations, and our analytical results verify that the proposed hop-by-hop scheme is superior to end-to-end schemes, especially with a large number of hops or high eavesdropper channel quality. Numerical results also show that the proposed hop-by-hop scheme achieves near-optimal performance in terms of the SCP.
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Xiaowei Li,Chaochao Ren,Zheyao Wang,Pai Zhao,Hongmei Wang,Yuxing Bai 대한치과교정학회 2016 대한치과교정학회지 Vol.46 No.2
Objective: The purposes of this study were to measure the orthodontic forces generated by thermoplastic aligners and investigate the possible influences of different activations for lingual bodily movements on orthodontic forces, and their attenuation. Methods: Thermoplastic material of 1.0-mm in thickness was used to manufacture aligners for 0.2, 0.3, 0.4, 0.5, and 0.6 mm activations for lingual bodily movements of the maxillary central incisor. The orthodontic force in the lingual direction delivered by the thermoplastic aligners was measured using a micro-stress sensor system for the invisible orthodontic technique, and was monitored for 2 weeks. Results: Orthodontic force increased with the amount of activation of the aligner in the initial measurements. The attenuation speed in the 0.6 mm group was faster than that of the other groups (p < 0.05). All aligners demonstrated rapid relaxation in the first 8 hours, which then decreased slowly and plateaued on day 4 or 5. Conclusions: The amount of activation had a substantial influence on the orthodontic force imparted by the aligners. The results suggest that the activation of lingual bodily movement of the maxillary central incisor should not exceed 0.5 mm. The initial 4 or 5 days is important with respect to orthodontic treatment incorporating an aligner.
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Shui Wang,Jidong Wang,Yizhen Du,Wenqian Zhang,Xiaowei Cheng 한국화학공학회 2014 Korean Journal of Chemical Engineering Vol.31 No.10
An efficient method for converting cellulose into 5-hydroxymethylfurfural (5-HMF) using an inexpen-sive ionic liquid tetrabutylammonium chloride (TBAC) and relatively low-toxicity catalyst of chromium (III) trichloride(CrCl3·6H2O) was developed. The effects of hydrochloric acid loading, catalyst dosage, reaction temperature and timeon the yield of 5-HMF were surveyed to achieve optimal reaction conditions. A 5-HMF yield of 43.7% was obtainedwithin 90 min at 140 oC using oil-bath heating. Glucose and starch were also investigated as feedstock to produce 5-HMF in TBAC/CrCl3·6H2O system, in which the 5-HMF yield was considerable. After 5-HMF was extracted, TBAC/CrCl3 ·6H2Ocould be used for several runs.
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Feng Wang,Xiaowei Wang,Hongbo Chen,Jianzhu Liu,Ziqiang Cheng 대한수의학회 2011 Journal of Veterinary Science Vol.12 No.3
The critical time of avian leukosis virus subgroup J (ALV-J)-mediated immunosuppression was determined by body weight, relative immune organ weight, histopathology, and presence of group specific antigen and antibodies in specific pathogen-free (SPF) chickens. CD4^+ and CD8^+ cell activity in the spleen, total and differential leukocyte counts in blood, and viral RNA levels in spleen were measured. Significant growth suppression was observed in the two ALV-J-infected groups. A strong immune response by infected groups was present in spleen at 2-weeks-of-age, but after 4-weeks-of-age, the response decreased quickly. The thymus and bursa showed persistent immunosuppression until 4-weeks-of-age. Proliferation of fibroblasts and dendritic cells were observed in immune organs at 4- and 5-weeks-of-age. However, the granulocyte cell number was markedly lower in the infected groups than in the control group. In group 1 (day 1 infection) CD4^+ cells increased during the second week but significantly decreased during the fourth week, while group 2 (day 7 infection) showed the opposite effect. Viral RNA increased significantly by the fourth week. These data identify 3∼4 weeks post-infection as the key time at which the ALV-J virus exerts its immunosuppressive effects on the host.
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Li, Xiaowei,Wang, Zhenyu,Li, Hanchao,Wang, Aiying,Lee, Kwang-Ryeol American Chemical Society 2019 The Journal of Physical Chemistry Part C Vol.123 No.45
<P>Fast transfer-free synthesis of graphene on a given dielectric substrate is achieved by Ni-catalyzed solid-state transformation of amorphous carbon (a-C) through rapid thermal processing (RTP). Nevertheless, the dependence of this transformation behavior on Ni/a-C thickness and the underlying mechanism at the atomic scale are not well comprehended, leading to the lack of efficient synthesis and modulation of the graphene structure experimentally. Here, using reactive molecular dynamics simulation, we select Ni as a catalyst and present a systematic investigation of the diffusion of C into Ni and the corresponding structural transformation of a-C into graphene under different conditions. The results emphasize the decisive role of the Ni/C atomic ratio in the quality and layer number of graphene instead of the Ni or a-C thickness. Combined with the results during the cooling process, they suggest that the a-C-to-graphene transformation mechanism is mainly dependent on the diffusion behavior of C and the catalytic effect of Ni, rather than the dissolution/precipitation. Most importantly, both the simulation and experiment propose a universal equation to elucidate the relationship between the number of C and Ni atoms and the RTP graphene structure. This finding not only enables the fast synthesis and modulation of a-C-transformed graphene with the desired structure and layers on various substrates without the transfer process but also gets rid of the limitation of carbon sources and Ni structures and simplifies the RTP process parameters significantly, which can be utilized widely in experiment to promote the commercial application of graphene.</P> [FIG OMISSION]</BR>
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