作者机构：
[Wu, Yanwen; Cao, Shuangshuang; Ma, Yanmei; Ge, Di] Cent China Normal Univ, Sch Phys Sci & Technol, Wuhan 430079, Peoples R China.;[Cheng, Yuhang] Shaanxi GSXZ Technol Co Ltd, Xian 710018, Peoples R China.;[Wu, Yanwen] Cent China Normal Univ, Natl Digital Learning Engn Technol Res Ctr, Wuhan 430079, Peoples R China.
通讯机构：
[Wu, YW ] C;Cent China Normal Univ, Sch Phys Sci & Technol, Wuhan 430079, Peoples R China.;Cent China Normal Univ, Natl Digital Learning Engn Technol Res Ctr, Wuhan 430079, Peoples R China.
关键词：
Anomaly detection;Multivariate time-series;Spatiotemporal;Abnormal information expression;Graph contrastive learning
摘要：
The detection of anomalies in high-dimensional time-series has always played a crucial role in the domain of system security. Recently, with rapid advancements in transformer model and graph neural network (GNN) technologies, spatiotemporal modeling approaches for anomaly detection tasks have been greatly improved. However, most methods focus on optimizing upstream time-series prediction tasks by leveraging joint spatiotemporal features. Through experiments, we found that this modeling approach not only risks the loss of some original anomaly information during data preprocessing, but also focuses on optimizing the performance of the upstream prediction task and does not directly enhance the performance of the downstream detection task. We propose a spatiotemporal anomaly detection model that incorporates an improved attention mechanism in the process of temporal modeling. We adopt a heterogeneous graph contrastive learning approach in spatio modeling to compensate for the representation of anomalous behavioral information, thereby guiding the model through thorough training. Through validation on two widely used real-world datasets, we demonstrate that our model outperforms baseline methods. We also explore the impact of multivariate time-series prediction tasks on the detection task, and visualize the reasons behind the benefits gained by our model.
摘要：
Ammonia (NH3) is an essential chemical and a promising fuel, but its industrially produced process is carbon-intensive and highly energy-consuming. Developing a green and sustainable NH3 synthesis route is extremely urgent. Electrochemical ammonia synthesis (EAS) powered by renewable electricity energy under ambient conditions is fascinating, while exploring the efficient electrocatalysts and suitable nitrogen source is critical. Due to the unique characteristics of adjustable porosity and component, large specific surface area and diverse structure, metal-organic frameworks (MOFs) and their various derivatives have captured immense interest in EAS. Herein, the advance in EAS via electrocatalytic reduction reactions (ERRs) from various nitrogen source under ambient conditions over MOF-based electrocatalysts is timely summarized, aiming to offer a deep insight to the structure-activity relationship of MOF-based electrocatalysts for EAS. Current challenges and future prospects for EAS are proposed at the end of this review as well.
作者机构：
[Zhang, Man; Zhang, Jiawei; Zhang, M] Cent China Normal Univ, Sch Foreign Languages, Wuhan, Peoples R China.;[Zhang, Man; Zhang, M] Humboldt Univ, Fac Language Literature & Humanities, Berlin, Germany.
通讯机构：
[Zhang, M ] C;Cent China Normal Univ, Sch Foreign Languages, Wuhan, Peoples R China.;Humboldt Univ, Fac Language Literature & Humanities, Berlin, Germany.
期刊：
Nonlinear Analysis: Real World Applications,2024年77:104046 ISSN：1468-1218
通讯作者：
Wang, YT
作者机构：
[Ma, Xuan] Wuhan Text Univ, Res Ctr Nonlinear Sci, Sch Math & Phys Sci, Wuhan 430200, Peoples R China.;[Wang, Yating] Cent China Normal Univ, Sch Math & Stat, Wuhan 430079, Peoples R China.;[Wang, Yating] Cent China Normal Univ, Hubei Key Lab Math Sci, Wuhan 430079, Peoples R China.
通讯机构：
[Wang, YT ] C;Cent China Normal Univ, Sch Math & Stat, Wuhan 430079, Peoples R China.;Cent China Normal Univ, Hubei Key Lab Math Sci, Wuhan 430079, Peoples R China.
摘要：
The dynamics of a rarefied gas in a finite channel with the same temperatures and opposite velocities is a fundamental problem in kinetic theory. The relative motion of the planar boundaries can induce a non-equilibrium state which is referred to as the Couette flow. In this paper, we demonstrate that the unsteady Couette flow for the Boltzmann equation in 3D finite channel time asymptotically converges to the 1D steady state constructed in Duan et al. (2022), we also prove the exponential time decay rate as a byproduct. The validity of the analysis is established for all hard potentials.
通讯机构：
[Xue, Q ] C;[Xie, GH ] X;Xiamen Univ, Inst Flexible Elect Future Technol, Xiamen 361005, Peoples R China.;Wuhan Univ, Sauvage Ctr Mol Sci, Dept Chem, Hubei Key Lab Organ & Polymer Optoelect Mat, Wuhan 430072, Peoples R China.;Cent China Normal Univ, Dept Phys Sci & Technol, Wuhan 430079, Peoples R China.
摘要：
Poly(3,4-ethylenedioxythiophene):poly(styrenesulfonate) (PEDOT:PSS) is a widely used conductive polymer in organic light-emitting devices. However, its strong acidity and fluorescence quenching effect seriously affect the overall device performance. We report a cost-effective method to address the above concerns by diluting PEDOT:PSS with deionized water, which effectively reduced the film thickness and the acidity. Therefore, the fluorescence quenching occurring at the interface was alleviated. Using the modified PEDOT:PSS as the hole injection layer, the external quantum efficiency of the device could be effectively improved by a factor of 81%, reaching a considerably higher value of 23.5%, compared with the device consisting of the original PEDOT:PSS solution used as received. A cost-effective method to address the issues of strong acidity and exciton quenching of PEDOT:PSS was developed by diluting it with deionized water. The solution-processed organic LEDs achieved almost doubled efficiencies with the modified PEDOT:PSS.
作者机构：
[Zhao, Qinqin] Dean's Office, MianYang Teachers' College, Mianyang, China;[Wang, Zheng; Bian, Yueran; Zeb, Irum; Zhang, Yan] School of Education, Huazhong University of Science and Technology, Wuhan, China;[Yang, Caihong] School of Psychology, Central China Normal University, Wuhan, China;[Chen, Han] President Office, MianYang Teachers' College, Mianyang, China;[Wang, Pu] Department of Rehabilitation Medicine, The seventh Affiliated Hospital Sun Yat-sen University, Shenzhen, China
关键词：
anxiety;anxiety without depression;cognitive control network;depression;fNIRS
摘要：
Anxiety is a common psychological disorder associated with other mental disorders, with depression being the most common comorbidity. Few studies have examined the neural mechanisms underlying anxiety after controlling for depression. This study aimed to explore whether there are differences in cortical activation in anxiety patients with different severities whose depression are normal. In the current study, depression levels were normal for 366 subjects-139 healthy subjects, 117 with mild anxiety, and 110 with major anxiety. Using the Hospital Anxiety and Depression Scale (HADS) and a verbal fluency task (VFT) to test subjects' anxiety and depression and cognitive function, respectively. A 53-channel guided near-infrared spectroscopic imaging technology (fNIRS) detected the concentration of oxyhemoglobin (oxy-Hb). Correlation analysis between anxiety severity and oxy-Hb concentration in the brain cortex was performed, as well as ANOVA analysis of oxy-Hb concentration among the three anxiety severity groups. The results showed that anxiety severity was significantly and negatively correlated with oxy-Hb concentrations in the left frontal eye field (lFEF) and in the right dorsolateral prefrontal area (rDLPFC). The oxy-Hb concentration in the lFEF and the rDLPFC were significantly lower in the major anxiety disorder group than that in the control group. This suggests that decreased cortical activity of the lFEF and rDLPFC may be neural markers of anxiety symptoms after controlling for depression. Anxiety symptoms without depression may be result from the dysfunction of the cognitive control network (CCN) which includes the lFEF and rDLPFC.
摘要：
The Alon–Tarsi number was defined by Jensen and Toft (Graph coloring problems, Wiley, New York, 1995). The Alon–Tarsi number AT(G) of a graph G is the smallest integer k such that G has an orientation D with maximum outdegree
$$k-1$$
and the number of even circulation is not equal to that of odd circulations in D. It is known that
$$\chi (G)\le \chi _l(G)\le AT(G)$$
for any graph G, where
$$\chi (G)$$
and
$$\chi _l(G)$$
are the chromatic number and the list chromatic number of G. Denote by
$$H_1 \square H_2$$
and
$$H_1\bowtie H_2$$
the Cartesian product and the semi-strong product of two graphs
$$H_1$$
and
$$H_2$$
, respectively. Kaul and Mudrock (Electron J Combin 26(1):P1.3, 2019) proved that
$$AT(C_{2k+1}\square P_n)=3$$
. Li, Shao, Petrov and Gordeev (Eur J Combin 103697, 2023) proved that
$$AT(C_n\square C_{2k})=3$$
and
$$AT(C_{2m+1}\square C_{2n+1})=4$$
. Petrov and Gordeev (Mosc. J. Comb. Number Theory 10(4):271–279, 2022) proved that
$$AT(K_n\square C_{2k})=n$$
. Note that the semi-strong product is noncommutative. In this paper, we determine
$$AT(P_m \bowtie P_n)$$
,
$$AT(C_m \bowtie C_{2n})$$
,
$$AT(C_m \bowtie P_n)$$
and
$$AT(P_m \bowtie C_{n})$$
. We also prove that
$$5\le AT(C_m \bowtie C_{2n+1})\le 6$$
.
作者：
Jing Hu;Lingfei Wu*;Yu Chen;Po Hu;Mohammed J. Zaki
期刊：
国际自动化与计算杂志,2024年21(2):272-282 ISSN：1476-8186
通讯作者：
Lingfei Wu
作者机构：
[Jing Hu; Po Hu] School of Computer Science, Central China Normal University, Wuhan, China;[Lingfei Wu] Pinterest, San Francisco, USA;[Yu Chen] Meta, Mountain View, USA;[Mohammed J. Zaki] Rensselaer Polytechnic Institute, Troy, USA
通讯机构：
[Lingfei Wu] P;Pinterest, San Francisco, USA
摘要：
The conversation machine comprehension (MC) task aims to answer questions in the multi-turn conversation for a single passage. However, recent approaches don’t exploit information from historical conversations effectively, which results in some references and ellipsis in the current question cannot be recognized. In addition, these methods do not consider the rich semantic relationships between words when reasoning about the passage text. In this paper, we propose a novel model GraphFlow+, which constructs a context graph for each conversation turn and uses a unique recurrent graph neural network (GNN) to model the temporal dependencies between the context graphs of each turn. Specifically, we exploit three different ways to construct text graphs, including the dynamic graph, static graph, and hybrid graph that combines the two. Our experiments on CoQA, QuAC and DoQA show that the GraphFlow+ model can outperform the state-of-the-art approaches.
作者：
J. Kvapil;G. Borca-Tasciuc;H. Bossi;K. Chen;Y. Chen;...
期刊：
Journal of Instrumentation,2024年19(02):C02066 ISSN：1748-0221
作者机构：
[J. Kvapil; H. Da Costa; C. Da Silva; J. Durham; X. Li; Y. Lin; M.X. Liu; Z. Shi] Los Alamos National Laboratory, Bikini Atoll Rd, Los Alamos, NM 87545, U.S.A.;[G. Borca-Tasciuc] Rensselaer Polytechnic Institute, 110 8th St, Troy, NY 12180, U.S.A.;[H. Bossi; Y. Corrales Morales; C. Dean; P. Harris; O. Hen; H. Jheng; Y. Lee; G. Roland] Massachusetts Institute of Technology, 77 Massachusetts Ave, Cambridge, MA 02139, U.S.A.;[K. Chen; Y. Chen] Central China Normal University, No. 152, Luoyu Rd, Wuhan 430079, China;[S. Fu; A. Olvera] University of North Texas, 1155 Union Cir, Denton, TX 76205, U.S.A.
摘要：
The RHIC interaction rate at sPHENIX will reach around 3 MHz in pp collisions and requires the detector readout to reject events by a factor of over 200 to fit the DAQ bandwidth of 15 kHz. Some critical measurements, such as heavy flavor production in pp collisions, often require the analysis of particles produced at low momentum. This prohibits adopting the traditional approach, where data rates are reduced through triggering on rare high momentum probes. We explore a new approach based on real-time AI technology, adopt an FPGA-based implementation using a custom designed FELIX-712 board with the Xilinx Kintex Ultrascale FPGA, and deploy the system in the detector readout electronics loop for real-time trigger decision.
作者机构：
[Tian, Lingkun; Zhou, Zijuan; Zhang, J; Zhang, Jun] Cent China Normal Univ, Sch Informat Management, Wuhan, Peoples R China.;[Zhang, J; Zhang, Jun] Cent China Normal Univ, E Commerce Res Ctr Hubei Prov, Wuhan, Peoples R China.
通讯机构：
[Zhang, J ] C;Cent China Normal Univ, Sch Informat Management, Wuhan, Peoples R China.;Cent China Normal Univ, E Commerce Res Ctr Hubei Prov, Wuhan, Peoples R China.
摘要：
The item and pod storage assignment problems, two critical issues at the strategic level in robotic mobile fulfillment systems, have a strong correlation and should be studied together. Moreover, the workload balance in each picking aisle needs to be considered in the storage assignment problems to avoid robots' congestion within picking aisles. Motivated by these, the joint optimization of item and pod storage assignment problems (J-IPSAP) with picking aisles' workload balance is studied. The mixed integer programming model of the J-IPSAP with the workload balance constraint is formulated to minimize the robots' movement distance. The improved genetic algorithm (IGA) with the decentralized pod storage assignment strategy is designed to solve the J-IPSAP model. The experimental results show that the IGA can obtain high-quality solutions when compared with Gurobi and the two-stage heuristic algorithms. The robots' movement distance is smallest when the width-to-length ratio of the storage area is close to 1, and the robots' movement distance will increase with more stringent workload balance constraints.
作者机构：
[Lasutschinkow, Patricia; Dillahunt, Alina; Bo, Jin] Department of Psychology, Eastern Michigan University, Ypsilanti, MI,USA;[Shen, Bo] Division of Kinesiology, Wayne State University, Detroit, MI,USA;[Dong, Liangshan; Xiang, Yuan; Pang, Yanli; Zhang, Mingting; Song, Yu] School of Physical Education, Central China Normal University, Wuhan, HUB,China;[Li, Dan] LinJie Autism Rehabilitation Center, Wuhan, HUB,China
关键词：
fundamental motor skills;generalization;transfer of learning
摘要：
The current study examined the acquisition, retention, and transfer effects of a motor program. Children with autism spectrum disorder participated in a 9-week program that targeted 13 fundamental motor skills based upon the Test of Gross Motor Development-3. Assessments were conducted before and after the program, as well as at 2-month follow-up. Significant improvements were found on not only the trained fundamental motor skills (acquisition) but also the untrained tasks on balance (transfer). The follow-up tests revealed continuous improvement on the trained locomotor skills (retention), as well as the untrained skills on balance (retention + transfer). These findings highlight the importance of continuous support and long-term participation on motor practices.
