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Data-driven Smart Ponzi Scheme Detection
[article]
2021
arXiv
pre-print
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; Kai Lei, Weijing Wu, and Feiyang Wang are with ICNLab, Peking University, Shenzhen, China , and Peng Cheng Laboratory, Shenzhen, China. ...
The existing smart Ponzi scheme detection methods can be broadly divided into detection methods based on source code inspection [5] , [6] Yuzhi Liang is with ICNLab, Peking University, Shenzhen, China ...
arXiv:2108.09305v1
fatcat:cn5q3o2oavb4biwb776rlaewse
Adaptive Technique for Underwater Acoustic Communication
[chapter]
2012
Underwater Acoustics
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Introduction Compared with the electromagnetic wave channel, the UWA (Underwater Acoustic) channel is characterized by large transmission delay, transmission loss increased with distance and frequency, serious multi-path effect, and remarkable Doppler Effect. These characteristics greatly influence the performance of UWA communication, and restrict channel capacity. Performance of UWA communication is far away from telecommunication, even if employ the similar techniques. Especially, available
doi:10.5772/33985
fatcat:wbiwfgcb3bbj5pyj7nvubmhvnu
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... andwidth is limited by spread distance because transmission loss increases with longer range distance. For example, the bandwidth for 5 km is 10 kHz whereas the bandwidth for 80 km is only 500Hz. For constant data rate, the bandwidth is confined by maximum working range and worst channel environment, so the utilization ratio of channel is very low. Besides the reasonable modulation model and advanced signal processing method which improves the detection performance of the receiver, the most fundamental way for reliable communication is adaptive modulation which greatly improves utilization ratio of bandwidth. Modulation and detection techniques used for UWA communication include phase coherent (PSK and QAM) and noncoherent (FSK) techniques. The choice of modulation mode is based on the UWA channel parameters, such as multipath and the Doppler spread, as well as the SNR. The spread factor of the UWA channel determines whether phase coherent communications are possible. If so, an equalizer is employed to combat any intersymbol interference. If the channel varies too rapidly, noncoherent signaling is chosen. The choice of modulation is determined by the operator. The objective of this chapter is based on the analysis of characteristics of UWA channel, developing algorithms that can self-adapting select the best technique for time varying UWA channel. Then the dynamic modulation and bandwidth optimization for high-rate UWA communication are deduced. At last the simulation results are shown. Fading characteristics of UWA channel 2.1 Characteristic of UWA channel Due to the absorption of medium itself, the wavefront expansion in sound propagation, the bending of acoustic ray, the scattering caused by various kinds of nonuniformity in ocean www.intechopen.com Underwater Acoustics 60 and so on, the acoustic intensity will weaken in its propagation direction. The fading will change with distance, frequency and sensors location, which can be divided into large-scale fading and small-scale fading.
Lightweight Single-Image Super-Resolution Network with Attentive Auxiliary Feature Learning
[article]
2020
arXiv
pre-print
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Despite convolutional network-based methods have boosted the performance of single image super-resolution (SISR), the huge computation costs restrict their practical applicability. In this paper, we develop a computation efficient yet accurate network based on the proposed attentive auxiliary features (A^2F) for SISR. Firstly, to explore the features from the bottom layers, the auxiliary feature from all the previous layers are projected into a common space. Then, to better utilize these
arXiv:2011.06773v1
fatcat:5tfkqhy44fdazk4d6ageh42opy
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... ed auxiliary features and filter the redundant information, the channel attention is employed to select the most important common feature based on current layer feature. We incorporate these two modules into a block and implement it with a lightweight network. Experimental results on large-scale dataset demonstrate the effectiveness of the proposed model against the state-of-the-art (SOTA) SR methods. Notably, when parameters are less than 320k, A^2F outperforms SOTA methods for all scales, which proves its ability to better utilize the auxiliary features. Codes are available at https://github.com/wxxxxxxh/A2F-SR.
Crystal Structure Prediction of Binary Alloys via Deep Potential
2020
Frontiers in Chemistry
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We refer to Yanchao Wang and Ma (2012) for more details of the CALYPSO code. ...
., 2006) , the CALYPSO package (Wang et al., 2010) , and the PyChemia library (Avendaño-Franco and Romero, 2016) , respectively. ...
Copyright © 2020 Wang, Zhang, Zhang and Wang. This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). ...
doi:10.3389/fchem.2020.589795
pmid:33330377
pmcid:PMC7732660
fatcat:62wa4xuipvbx3dcp6qo7tiaqvm
Optical Forces in Coupled Chiral Particles
[article]
2020
arXiv
pre-print
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Structural chirality can induce counter-intuitive optical forces due to inherent symmetry properties. While optical forces on a single chiral particle in the Rayleigh regime have been well studied, optical forces in coupled chiral particles remain less explored. By using full-wave numerical simulations and analytical methods of source representation and coupled mode theory, we investigated the optical forces induced by a plane wave on two chiral particles coupling with each other via the
arXiv:2007.12443v1
fatcat:kcdxip4mn5a47nqv52i7knvbxq
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... ent near fields. We found that the induced electric and magnetic dipoles of the chiral particles have complicated couplings that give rise to dark and bright modes. The interaction force between the particles can be either attractive or repulsive, and its magnitude can be significantly enhanced by the resonance modes. The attractive force is much stronger if two particles are of opposite handedness compared with the case of same handedness. The electric dipole force and the magnetic dipole force have the same sign for two particles with the same handedness, while they are of different signs for two particles with opposite handedness. The results can lead to a better understanding of chirality-induced optical forces with potential applications in optical manipulations and chiral light-matter interactions.
First records of Hypsugo cadornae (Chiroptera: Vespertilionidae) in China
2020
Mammalia (Paris)
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AbstractHypsugo cadornae bats have been found in India, Myanmar, Thailand, Vietnam, Laos, and Cambodia. In 2017 and 2018, 15 medium size Hypsugo bats were collected from Shaoguan, Guangzhou, and Huizhou in Guangdong, China. Molecular and morphological examinations identified them as H. cadornae. This is the first record of H. cadornae in China. Morphological and ultrasonic characteristics of H. cadornae were compared with its close relative, Hypsugo pulveratus.
doi:10.1515/mammalia-2020-0029
fatcat:rlxqoqblffb4vjbep3ra5j7whm
Convergence of the Planewave Approximations for Quantum Incommensurate Systems
[article]
2022
arXiv
pre-print
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Incommensurate structures come from stacking the single layers of low-dimensional materials on top of one another with misalignment such as a twist in orientation. While these structures are of significant physical interest, they pose many theoretical challenges due to the loss of periodicity. This paper studies the spectrum distribution of incommensurate Schrödinger operators. We characterize the density of states for the incommensurate system and develop novel numerical methods to approximate
arXiv:2204.00994v1
fatcat:fbrnax4otnhmropkhhrz7dxy7m
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... them. In particular, we (i) justify the thermodynamic limit of the density of states in the real space formulation; and (ii) propose efficient numerical schemes to evaluate the density of states based on planewave approximations and reciprocal space sampling. We present both rigorous analysis and numerical simulations to support the reliability and efficiency of our numerical algorithms.
Fractional matching preclusion for butterfly derived networks
2019
Theory and Applications of Graphs
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Digital Commons@Georgia Southern, 2019
Theory and Applications of Graphs, Vol. 6 [2019], Iss. 1, Art. 3 https://digitalcommons.georgiasouthern.edu/tag/vol6/iss1/3 DOI: 10.20429/tag.2019.060103
Wang ...
doi:10.20429/tag.2019.060103
fatcat:ifbgs3ggfjfi7jrc6qmojxgaei
Orientation Ordering and Chiral Superstructures in Fullerene Monolayer on Cd (0001)
2020
Nanomaterials
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The structure of C60 thin films grown on Cd (0001) surface has been investigated from submonolayer to second monolayer regimes with a low-temperature scanning tunneling microscopy (STM). There are different C60 domains with various misorientation angles relative to the lattice directions of Cd (0001). In the (2√3 × 2√3) R30° domain, orientational disorder of the individual C60 molecules with either pentagon, hexagon, or 6:6 bond facing up has been observed. However, orientation ordering
doi:10.3390/nano10071305
pmid:32635309
fatcat:pe5425pqwra7jehrnooj5f3i6m
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... in the R26° domain such that all the C60 molecules adopt the same orientation with the 6:6 bond facing up. In particular, complex chiral motifs composed of seven C60 molecules with clockwise or anticlockwise handedness have been observed in the R4° and R8° domains, respectively. Scanning tunneling spectroscopy (STS) measurements reveal a reduced HOMO–LOMO gap of 2.1 eV for the C60 molecules adsorbed on Cd (0001) due to the substrate screening and charge transfer from Cd to C60 molecules.
Depression after minor stroke: Prevalence and predictors
2015
Journal of Psychosomatic Research
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Acknowledgments -11 - The authors would like to thank all of the participating hospitals and colleagues, particularly Tong Zhang, Yong Zhou, Ying Bai, Juan Zhou, De-Jun Liang, Li-Ping Liu, Gai-Fen Liu, An-Xin Wang ...
doi:10.1016/j.jpsychores.2015.03.012
pmid:25868687
fatcat:dx7kd5u7yjdtxkisclarejbgua
Application of the Phase Space Reconstruction in Ecology
2010
Mathematical and Computational Applications
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A brief introduction to phase space reconstruction in ecology is given, and the application of the method to rodent populations is illustrated. Results show that phase space reconstruction is highly convenient and effective when utilized in short-term predictions in natural population.
doi:10.3390/mca15050872
fatcat:h2l3jszmd5gojmeo76kvdxsa2y
Transilient Response to Acetone Gas Using the Interlocking p+n Field-Effect Transistor Circuit
2018
Sensors
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Low concentration acetone gas detection is significantly important for diabetes diagnosis as 1.8-10 ppm of acetone exists in exhaled breath from diabetes patients. A new interlocking p+n field-effect transistor (FET) circuit has been proposed for Mn-doped ZnO nanoparticles (MZO) to detect the acetone gas at low concentration, especially close to 1.8 ppm. It is noteworthy that MZO in this interlocking amplification circuit shows a low voltage signal of <0.3 V to the acetone <2 ppm while it
doi:10.3390/s18061914
pmid:29895805
pmcid:PMC6021865
fatcat:iuuacd62brdqpk6son62e4vsdy
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... ys a transilient response with voltage signal >4.0 V to >2 ppm acetone. In other words, the response to acetone from 1 ppm to 2 ppm increases by~1233%, which is competent to separate diabetic patients from healthy people. Moreover, the response to 2 ppm acetone is hardly influenced by high relative humidity of 85%. In the meanwhile, MZO in this interlocking circuit possesses a high acetone selectivity compared to formaldehyde, acetaldehyde, toluene and ethanol, suggesting a promising technology for the widespread qualitative screening of diabetes. Importantly, this interlocking circuit is also applicable to other types of metal oxide semiconductor gas sensors. The resistance jump of p-and n-FETs induced by the change of their gate voltages is deemed to make this interlocking circuit produce the transilient response.
Preparation and Nutritional Characterization of Perilla Chewable Tablet
2012
Procedia Engineering
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In this study, the preparation and trophic characterization of perilla chewable tablet were investigated. Perilla chewable tablet was prepared according to the following process: mixing perilla raw materials with excipients, making wet granules, drying, tabletting and coating. The optimal formula was determined as follows: 8% perilla powder, 2.5% perilla extract powder, 20% isomaltooligosaccharide, 20% microcrystalline cellulose, 44.4% lactose, 0.5% essence of perilla, 0.1% sucralose, 2%
doi:10.1016/j.proeng.2012.04.227
fatcat:ig3qxm6ezbfthjpxhvzfr5kzrm
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... tol, 2% vitamin C, 0.5% magnesium stearate. Results from nutrient analysis showed that perilla chewable tablet was rich in essential vitamins and mineral substances, which are good for human health.
GoHop: Personal VPN to defend from censorship
2014
16th International Conference on Advanced Communication Technology
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Internet censorship threatens people's online privacy, and in recent years, new technologies such as high-speed Deep Packet Inspection (DPI) and statistical traffic analysis methods had been applied in country scale censorship and surveillance projects. Traditional encryption protocols cannot hide statistical flow properties and new censoring systems can easily detect and block them "in the dark". Recent work showed that traffic morphing and protocol obfuscation are effective ways to defend
doi:10.1109/icact.2014.6778916
fatcat:sgf3cdjfmrhd5aswnma2w5652q
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... statistical traffic analysis. In this paper, we proposed a novel traffic obfuscation protocol, where client and server communicate on random port. We implemented our idea as an open-source VPN tool named GoHop, and developed several obfuscation method including preshared key encryption, traffic shaping and random port communication. Experiments has shown that GoHop can successfully bypass internet censoring systems, and can provide high-bandwidth network throughput.
Modeling V1 Disparity Tuning to Time-Varying Stimuli
2001
Journal of Neurophysiology
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Wang was supported by Grants 69835020, 39670186, and 39893340-06 from the National Natural Science Foundation of China. ...
doi:10.1152/jn.2001.86.1.143
pmid:11431496
fatcat:3a57xdagrvgwnfb6t6fj2fwmi4
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