Traffic encryption techniques facilitate cyberattackers to hide their presence and *** classification is an important method to prevent network ***,due to the tremendous traffic volume and limitations of computing,mos...
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Traffic encryption techniques facilitate cyberattackers to hide their presence and *** classification is an important method to prevent network ***,due to the tremendous traffic volume and limitations of computing,most existing traffic classification techniques are inapplicable to the high-speed network *** this paper,we propose a High-speed Encrypted Traffic Classification(HETC)method containing two ***,to efficiently detect whether traffic is encrypted,HETC focuses on randomly sampled short flows and extracts aggregation entropies with chi-square test features to measure the different patterns of the byte composition and distribution between encrypted and unencrypted ***,HETC introduces binary features upon the previous features and performs fine-grained traffic classification by combining these payload features with a Random Forest *** experimental results show that HETC can achieve a 94%F-measure in detecting encrypted flows and a 85%–93%F-measure in classifying fine-grained flows for a 1-KB flow-length dataset,outperforming the state-of-the-art comparison ***,HETC does not need to wait for the end of the flow and can extract mass computing *** average time for HETC to process each flow is only 2 or 16 ms,which is lower than the flow duration in most cases,making it a good candidate for high-speed traffic classification.
Cardiovascular disease remains a major issue for mortality and morbidity, making accurate classification crucial. This paper introduces a novel heart disease classification model utilizing Electrocardiogram (ECG) sign...
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The dynamic response is a critical performance indicator of air-cooled fuel cells, directly affecting their operation's stability and reliability. This paper experimentally investigated the impact of different ope...
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The dynamic response is a critical performance indicator of air-cooled fuel cells, directly affecting their operation's stability and reliability. This paper experimentally investigated the impact of different operating conditions on the dynamic response characteristics of the air-cooled proton exchange membrane fuel cell(PEMFC) stack. The overvoltage of fuel cells at higher ambient temperatures is smaller after loading, and it takes a shorter time for fuel cells to recover to a stable level. Different air supply modes were investigated, results show that increasing the cathode gas flow rate helps reduce the overshoot voltage of the air-cooled PEMFC stack. A higher cathode flow rate enhances the oxygen concentration at the catalyst layer, helping to supplement the local gas shortage. In addition, as the gas pressure inside the stack is slightly lower than the ambient pressure when the air-cooled PEMFC operates with the exhaust mode, the overshoot voltage of the exhaust air supply mode is 15.8 %higher than that of the blow airflow mode under the same air fan speed(4500r/min). Increasing the load change rate leads to insufficient local gas supply without enough time to replenish, causing the cell's overshoot voltage to rise; the more significant the load change rate, the greater the cell's overshoot voltage. Reducing the anode pulse purging interval can reduce the cell output voltage fluctuation with limited effect.
Research on mass gathering events is critical for ensuring public security and maintaining social ***,most of the existing works focus on crowd behavior analysis areas such as anomaly detection and crowd counting,and ...
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Research on mass gathering events is critical for ensuring public security and maintaining social ***,most of the existing works focus on crowd behavior analysis areas such as anomaly detection and crowd counting,and there is a relative lack of research on mass gathering *** believe real-time detection and monitoring of mass gathering behaviors are essential formigrating potential security risks and ***,it is imperative to develop a method capable of accurately identifying and localizing mass gatherings before disasters occur,enabling prompt and effective *** address this problem,we propose an innovative Event-Driven Attention Network(EDAN),which achieves image-text matching in the scenario of mass gathering events with good results for the first *** image-text retrieval methods based on global alignment are difficult to capture the local details within complex scenes,limiting retrieval *** local alignment-based methods aremore effective at extracting detailed features,they frequently process raw textual features directly,which often contain ambiguities and redundant information that can diminish retrieval efficiency and degrade model *** overcome these challenges,EDAN introduces an Event-Driven AttentionModule that adaptively focuses attention on image regions or textual words relevant to the event *** calculating the semantic distance between event labels and textual content,this module effectively significantly reduces computational complexity and enhances retrieval *** validate the effectiveness of EDAN,we construct a dedicated multimodal dataset tailored for the analysis of mass gathering events,providing a reliable foundation for subsequent *** conduct comparative experiments with other methods on our dataset,the experimental results demonstrate the effectiveness of *** the image-to-text retrieval task,EDAN achieved the best performance on the R@5 metric,w
Advancements in neuromorphic computing have given an impetus to the development of systems with adaptive behavior,dynamic responses,and energy efficiency *** charge-based or emerging memory technologies such as memris...
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Advancements in neuromorphic computing have given an impetus to the development of systems with adaptive behavior,dynamic responses,and energy efficiency *** charge-based or emerging memory technologies such as memristors have been developed to emulate synaptic plasticity,replicating the key functionality of neurons—integrating diverse presynaptic inputs to fire electrical impulses—has remained *** this study,we developed reconfigurable metal-oxide-semiconductor capacitors(MOSCaps)based on hafnium diselenide(HfSe2).The proposed devices exhibit(1)optoelectronic synaptic features and perform separate stimulus-associated learning,indicating considerable adaptive neuron emulation,(2)dual light-enabled charge-trapping and memcapacitive behavior within the same MOSCap device,whose threshold voltage and capacitance vary based on the light intensity across the visible spectrum,(3)memcapacitor volatility tuning based on the biasing conditions,enabling the transition from volatile light sensing to non-volatile optical data *** reconfigurability and multifunctionality of MOSCap were used to integrate the device into a leaky integrate-and-fire neuron model within a spiking neural network to dynamically adjust firing patterns based on light stimuli and detect exoplanets through variations in light intensity.
The development of bifunctional electrocatalysts for hydrogen evolution reaction(HER)and oxygen evolu-tion reaction(OER)at high current density under industrial temperatures is crucial for large-scale indus-trial hydr...
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The development of bifunctional electrocatalysts for hydrogen evolution reaction(HER)and oxygen evolu-tion reaction(OER)at high current density under industrial temperatures is crucial for large-scale indus-trial hydrogen production from water *** this work,M-MnO2@TNTA composite electrodes were prepared by depositing various metal ion-doped manganese oxide nanoparticles on the titania nanotube array(TNTA)by successive ionic layer adsorption reaction(SILAR)method,and their HER and OER elec-trocatalytic performances were investigated in 1 M *** show that the CoFe-MnO2@TNTA com-posite electrode prepared by simultaneous doping of Co3+and Fe3+in MnO2 exhibits optimal catalytic *** with MnO2@TNTA without ion doping,the overpotentials of CoFe-MnO2@TNTA at 10 mA cm-2(η10)for HER and OER are reduced by 571 and 665 *** addition,the electrode perfor-mance can be significantly enhanced by increasing the test temperature,and the porous array structure enables CoFe-MnO2@TNTA to exhibit better performance at high current *** 50 ℃,which is the common industrial electrolytic water temperature,the η10 of CoFe-MnO2@TNTA for HER is almost equal to that of the Pt/C *** η100 of CoFe-MnO2@TNTA for HER is reduced by 35 mV com-pared with the Pt/C ***,η200 of CoFe-MnO2@TNTA for OER is significantly lowered by 111 and 184 mV compared with IrO2 and RuO2 *** CoFe-MnO2@TNTA as both the cath-ode and anode for overall water splitting,the electrolysis voltage is merely 2.33 V under the current density of 200 mA cm-2,much lower than that of IrO2(+)||Pt/C(-)(2.68 V).The present work may provide a valuable reference for the development of self-supporting bifunctional electrodes suitable for high-current-density water splitting at industrial temperatures.
Microstructures and properties of mortar using ammonium phosphate and potassium phosphate were tested and compared in this ***,two cementitious additions and two lightweight aggregates,including fly ash,redispersible ...
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Microstructures and properties of mortar using ammonium phosphate and potassium phosphate were tested and compared in this ***,two cementitious additions and two lightweight aggregates,including fly ash,redispersible latex powder,ceramsite sand,and rubber powder,were respectively tried to be applied in magnesium ammonium phosphate cement mortar in order to modify the microstructures and *** experimental results show that potassium phosphate is not suitable for magnesium phosphate cement mortar for cold region construction *** fly ash can bring positive modification in the condition of normal temperature curing,it brings negative effects in the condition of sub-zero temperature *** redispersible latex powder or ceramsite sand can improve the freeze-thaw cycling resistance of magnesium phosphate cement mortar in the conditions of low temperature coupled with freeze-thaw cycling,but only the ceramsite sand can improve both mechanical properties and freeze-thaw cycling *** modification caused by ceramsite sand is mainly due to the exceptional bonding strength between hardened cement paste and the porous surface of ceramsite and the porous structure of ceramsite for the release of frost heave stress.
Zirconia nanotube array films(ZNAF)prepared by anodic oxidation method were used as immobilization materials for acridine orange(AO),rhodamine B(RB)and AO-RB systems.A comparative study on their fluorescence emission ...
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Zirconia nanotube array films(ZNAF)prepared by anodic oxidation method were used as immobilization materials for acridine orange(AO),rhodamine B(RB)and AO-RB systems.A comparative study on their fluorescence emission intensity,fluorescence resonance energy transfer(FRET)and fluorescence detection of nitrite in aqueous solutions and on immobilization films with ZNAF as carriers was carried *** demonstrate that the solution pH values and immobilization on ZNAF have a great influence on the per-formance of these fluorescent *** with aqueous solutions,the fluorescence emission in-tensity of AO and RB is considerably increased by immobilization,which is 8.0 and 4.2 times higher than the original,*** energy transfer efficiency(E)of the AO-RB system increases from 40.9％to 84.8％by loading it on ***,after immobilization onto ZNAF,the fluorescence detection performance of nitrite is also significantly *** limit of detection decreases from 0.95 ng/mL to 0.22 ng/mL and the sensitivity increases from 939.18 to 15,031.68 mL/pg through loading AO onto ZNAF.
Archimedean solids were first proposed by the ancient Greek philosopher Archimedes. Unfortunately, this aspect of his work was not well-documented. It was not until 1619 that the mathematician Johannes Kepler reconstr...
Archimedean solids were first proposed by the ancient Greek philosopher Archimedes. Unfortunately, this aspect of his work was not well-documented. It was not until 1619 that the mathematician Johannes Kepler reconstructed the complete set of 13 Archimedean solids [1]. Among these solids, only the snub cube and snub dodecahedron are chiral.
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