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On elastic and plastic length scales in strain gradient plasticity
Jinxing Liu,Wen Wang,Ziyu Zhao,Ai Kah Soh 국제구조공학회 2017 Structural Engineering and Mechanics, An Int'l Jou Vol.61 No.2
The Fleck-Hutchinson theory on strain gradient plasticity (SGP), proposed in Adv. Appl Mech 33 (1997) 295, has recently been reformulated by adopting the strategy of decomposing the second order strain presented by Lam et al. in J Mech Pays Solids 51 (2003) 1477. The newly built SGP satisfies the non negativity of plastic dissipation, which is still an outstanding issue in other SGP theories. Furthermore, it explicitly shows how elastic strain gradients and corresponding elastic characteristic length scales come into play in general elastic-plastic loading histories. In this study, the relation between elastic length scales and plastic length scales is investigated by taking wire torsion as an example. It is concluded that the size effects arising when two sets of length scales are of the same order are essentially elastic instead of plastic.
Shasha Yuan,Jinxing Liu,Junliang Shang,Xiangzhen Kong,Qi Yuan,Zhen Ma 대한의용생체공학회 2018 Biomedical Engineering Letters (BMEL) Vol.8 No.4
Since epileptic seizure is unpredictable and paroxysmal, an automatic system for seizure detecting could be of greatsignificance and assistance to patients and medical staff. In this paper, a novel method is proposed for multichannel patientspecificseizure detection applying the earth mover’s distance (EMD) in scalp EEG. Firstly, the wavelet decomposition isexecuted to the original EEGs with five scales, the scale 3, 4 and 5 are selected and transformed into histograms andafterwards the distances between histograms in pairs are computed applying the earth mover’s distance as effectivefeatures. Then, the EMD features are sent to the classifier based on the Bayesian linear discriminant analysis (BLDA) forclassification, and an efficient postprocessing procedure is applied to improve the detection system precision, finally. Toevaluate the performance of the proposed method, the CHB-MIT scalp EEG database with 958 h EEG recordings from 23epileptic patients is used and a relatively satisfactory detection rate is achieved with the average sensitivity of 95.65% andfalse detection rate of 0.68/h. The good performance of this algorithm indicates the potential application for seizuremonitoring in clinical practice.
Throughput and Delay of Single-Hop and Two-Hop Aeronautical Communication Networks
Yufeng Wang,Mustafa Cenk Ertürk,Jinxing Liu,나인호,산카,Salvatore Morgera 한국통신학회 2015 Journal of communications and networks Vol.17 No.1
Aeronautical communication networks (ACN) is an emerging concept in which aeronautical stations (AS) are considered as a part of multi-tier network for the future wireless communication system. An AS could be a commercial plane, helicopter, or any other low orbit station, i.e., Unmanned air vehicle, high altitude platform. The goal of ACN is to provide high throughput and cost effective communication network for aeronautical applications (i.e., Air traffic control (ATC), air traffic management (ATM) communications, and commercial in-flight Internet activities), and terrestrial networks by using aeronautical platforms as a backbone. In this paper, we investigate the issues about connectivity, throughput, and delay in ACN. First, topology of ACN is presented as a simple mobile ad hoc network and connectivity analysis is provided. Then, by using information obtained fromconnectivity analysis, we investigate two communication models, i.e., single-hop and two-hop, in which each source AS is communicating with its destination AS with or without the help of intermediate relay AS, respectively. In our throughput analysis, we use the method of finding the maximum number of concurrent successful transmissions to derive ACN throughput upper bounds for the two communication models. We conclude that the two-hop model achieves greater throughput scaling than the single-hop model for ACN and multihop models cannot achieve better throughput scaling than two-hop model. Furthermore, since delay issue is more salient in two-hop communication, we characterize the delay performance and derive the closed-form average end-to-end delay for the two-hop model. Finally, computer simulations are performed and it is shown that ACN is robust in terms of throughput and delay performances.
Chen, Qilin,Yu, Xinjian,Chen, Jinxing,Liu, Yuequn,Weng, Jun,Xu, Chunhe Korean Society of Photoscience 2002 Journal of Photosciences Vol.9 No.2
The emission of microwave sulfur lamp is mainly composed of visible light. This lamp producing little infrared radiation, has high light efficiency, long lifespan and less power consumption. In comparison with xenon lamp, growing under sulfur lamp apparently postponed jointing, increased the number of tillers, accelerated root growth of wheat. Relatively, xenon lamp evidently promoted heading and grain maturation. The development characteristics of wheat plant under sulfur lamp were more similar with that in natural condition.
Influence of Illumination with Xenon or Sulfur Lamp on Growth of Tomato Seedlings
Chen, Qilin,Yu, Xinjian,Weng, Jun,Chen, Jinxing,Liu, Yuequn,Gao, Jinpeng,Xu, Chunhe Korean Society of Photoscience 2002 Journal of Photosciences Vol.9 No.2
Effects of illumination with xenon or sulfur lamp on growth of tomato seedlings were studied. Results showed no obvious differences in net photosynthetic rate and apparent quantum efficiency. In comparison with xenon lamp, illumination with sulfur lamp slightly reduced ChI a and ChI b content in leaves, relatively shortened epicotyl and hypocotyl length, but significantly increased anthocyanin content of leaves and promoted root growth of tomato seedling plants.