Subjects -> COMMUNICATIONS (Total: 518 journals)
    - COMMUNICATIONS (446 journals)
    - DIGITAL AND WIRELESS COMMUNICATION (31 journals)
    - HUMAN COMMUNICATION (19 journals)
    - MEETINGS AND CONGRESSES (7 journals)
    - RADIO, TELEVISION AND CABLE (15 journals)

COMMUNICATIONS (446 journals)                  1 2 3 | Last

Showing 1 - 200 of 480 Journals sorted by number of followers
Evidence Based Library and Information Practice     Open Access   (Followers: 461)
Information Technologies & International Development     Open Access   (Followers: 84)
Information, Communication & Society     Hybrid Journal   (Followers: 75)
Journal of Communication     Hybrid Journal   (Followers: 62)
Convergence The International Journal of Research into New Media Technologies     Hybrid Journal   (Followers: 48)
Augmentative and Alternative Communication     Hybrid Journal   (Followers: 45)
e-learning and education (eleed)     Open Access   (Followers: 40)
Communication Theory     Hybrid Journal   (Followers: 34)
Journal of Computer-Mediated Communication     Open Access   (Followers: 33)
Journal of the Association for Information Systems     Open Access   (Followers: 31)
New Media and Mass Communication     Open Access   (Followers: 31)
Journalism & Mass Communication Quarterly     Hybrid Journal   (Followers: 30)
Communication     Open Access   (Followers: 29)
Communication, Culture & Critique     Hybrid Journal   (Followers: 29)
New Review of Film and Television Studies     Hybrid Journal   (Followers: 26)
Proceedings of the American Society for Information Science and Technology     Hybrid Journal   (Followers: 26)
Health Information Management Journal     Hybrid Journal   (Followers: 26)
Electronic Journal of Knowledge Management     Open Access   (Followers: 25)
Journal of Medical Internet Research     Open Access   (Followers: 25)
Discourse, Context & Media     Open Access   (Followers: 25)
Canadian Journal of Communication     Partially Free   (Followers: 24)
International Journal of Advanced Media and Communication     Hybrid Journal   (Followers: 23)
Art Design & Communication in Higher Education     Hybrid Journal   (Followers: 22)
Information & Communications Technology Law     Hybrid Journal   (Followers: 22)
Framework : The Journal of Cinema and Media     Full-text available via subscription   (Followers: 22)
Journal of Information, Communication and Ethics in Society     Hybrid Journal   (Followers: 22)
Journalism & Mass Communication Educator     Hybrid Journal   (Followers: 22)
Quarterly Review of Film and Video     Hybrid Journal   (Followers: 21)
Journal of International and Intercultural Communication     Hybrid Journal   (Followers: 20)
Language and Speech     Hybrid Journal   (Followers: 19)
Journal of Media Psychology     Hybrid Journal   (Followers: 19)
ACM Transactions on Information Systems (TOIS)     Hybrid Journal   (Followers: 19)
Journalism & Communication Monographs     Hybrid Journal   (Followers: 19)
Screen     Hybrid Journal   (Followers: 18)
Science Fiction Film and Television     Hybrid Journal   (Followers: 18)
IEEE Transactions on Smart Grid     Hybrid Journal   (Followers: 18)
Global Media and Communication     Hybrid Journal   (Followers: 17)
Human Communication Research     Hybrid Journal   (Followers: 17)
Journal of Science Communication     Open Access   (Followers: 17)
Communication Booknotes Quarterly     Hybrid Journal   (Followers: 16)
Journal of Magnetic Resonance Imaging     Hybrid Journal   (Followers: 16)
Journal for the History of Rhetoric     Hybrid Journal   (Followers: 16)
PAJ: A Journal of Performance and Art     Hybrid Journal   (Followers: 15)
Public Relations Review     Hybrid Journal   (Followers: 15)
Quarterly Journal of Speech     Hybrid Journal   (Followers: 15)
Journal of Writing in Creative Practice     Hybrid Journal   (Followers: 15)
Communications of the Association for Information Systems     Open Access   (Followers: 15)
International Journal of Society, Culture & Language     Open Access   (Followers: 15)
Studies in Media and Communication     Open Access   (Followers: 15)
Journal of Media Ethics : Exploring Questions of Media Morality     Hybrid Journal   (Followers: 14)
Journal of the American College of Radiology     Hybrid Journal   (Followers: 14)
International Journal of Information Technology, Communications and Convergence     Hybrid Journal   (Followers: 14)
International Journal of Computer Science and Telecommunications     Open Access   (Followers: 14)
Communications in Mobile Computing     Open Access   (Followers: 14)
Journal of Applied Journalism & Media Studies     Hybrid Journal   (Followers: 14)
Celebrity Studies     Hybrid Journal   (Followers: 14)
Journal of Broadcasting & Electronic Media     Hybrid Journal   (Followers: 13)
Design Ecologies     Hybrid Journal   (Followers: 13)
International Journal of Information and Communication Technology Education     Full-text available via subscription   (Followers: 13)
Chinese Journal of Communication     Hybrid Journal   (Followers: 12)
MedieKultur. Journal of media and communication research     Open Access   (Followers: 12)
Pragmatics and Society     Hybrid Journal   (Followers: 12)
Global Media Journal     Open Access   (Followers: 12)
Qualitative Studies     Open Access   (Followers: 12)
IEICE - Transactions on Fundamentals of Electronics, Communications and Computer Sciences     Full-text available via subscription   (Followers: 11)
IET Communications     Open Access   (Followers: 11)
Journal of Technical Writing and Communication     Full-text available via subscription   (Followers: 11)
ACM Transactions on Multimedia Computing, Communications, and Applications (TOMCCAP)     Hybrid Journal   (Followers: 11)
International Journal of Business Communication     Hybrid Journal   (Followers: 10)
Qualitative Research Reports in Communication     Hybrid Journal   (Followers: 10)
Journal of European Popular Culture     Hybrid Journal   (Followers: 10)
Informal Logic     Open Access   (Followers: 10)
Communication & Language at Work     Open Access   (Followers: 10)
Audiology - Communication Research     Open Access   (Followers: 10)
Magnetic Resonance Imaging     Hybrid Journal   (Followers: 9)
Interaction Studies     Hybrid Journal   (Followers: 9)
Fibreculture Journal     Open Access   (Followers: 9)
Comedy Studies     Hybrid Journal   (Followers: 9)
Electronics and Communications in Japan     Hybrid Journal   (Followers: 9)
tripleC : Communication, Capitalism & Critique. Open Access Journal for a Global Sustainable Information Society     Open Access   (Followers: 9)
International Journal of Ad Hoc and Ubiquitous Computing     Hybrid Journal   (Followers: 8)
Journal of Radiotherapy in Practice     Hybrid Journal   (Followers: 8)
Seminars in Interventional Radiology     Hybrid Journal   (Followers: 8)
Information Design Journal     Hybrid Journal   (Followers: 8)
Myth & Symbol     Hybrid Journal   (Followers: 8)
Black Camera     Full-text available via subscription   (Followers: 8)
Journal of Islamic Manuscripts     Hybrid Journal   (Followers: 8)
Cross-cultural Communication     Open Access   (Followers: 8)
International Journal of Electronics and Telecommunications     Open Access   (Followers: 8)
Communication & Sport     Hybrid Journal   (Followers: 8)
China Communications     Full-text available via subscription   (Followers: 8)
Investigative Radiology     Hybrid Journal   (Followers: 7)
Pediatric Radiology     Hybrid Journal   (Followers: 7)
Journal of Language and Politics     Hybrid Journal   (Followers: 7)
Technical Communication     Full-text available via subscription   (Followers: 7)
African Journal of Information and Communication     Open Access   (Followers: 7)
Annals of Telecommunications     Hybrid Journal   (Followers: 7)
Intelligent Information Management     Open Access   (Followers: 7)
Metaverse Creativity     Hybrid Journal   (Followers: 7)
African Journal of Information Systems     Open Access   (Followers: 7)
Journal of Radio & Audio Media     Hybrid Journal   (Followers: 6)
Review of Cognitive Linguistics     Hybrid Journal   (Followers: 6)
Foundations and Trends® in Communications and Information Theory     Full-text available via subscription   (Followers: 6)
Journal of Professional Communication     Open Access   (Followers: 6)
The Communication Review     Hybrid Journal   (Followers: 5)
Radio Journal : International Studies in Broadcast & Audio Media     Hybrid Journal   (Followers: 5)
Journal of Asian Pacific Communication     Hybrid Journal   (Followers: 5)
Journal of Graph Theory     Hybrid Journal   (Followers: 5)
Sign Language Studies     Full-text available via subscription   (Followers: 5)
Middle East Journal of Culture and Communication     Hybrid Journal   (Followers: 5)
Explorations in Media Ecology     Hybrid Journal   (Followers: 5)
Journal of Italian Cinema and Media Studies     Hybrid Journal   (Followers: 5)
CIC. Cuadernos de Informacion y Comunicacion     Open Access   (Followers: 5)
Women's Studies in Communication     Hybrid Journal   (Followers: 5)
Global Advances in Business Communication     Open Access   (Followers: 5)
Transactions on Emerging Telecommunications Technologies     Hybrid Journal   (Followers: 4)
Journal of Radiology Nursing     Hybrid Journal   (Followers: 4)
Neuroimaging Clinics of North America     Full-text available via subscription   (Followers: 4)
Telecommunication Systems     Hybrid Journal   (Followers: 4)
Terminology     Hybrid Journal   (Followers: 4)
Gesture     Hybrid Journal   (Followers: 4)
Media International Australia     Hybrid Journal   (Followers: 4)
International Review of Pragmatics     Hybrid Journal   (Followers: 4)
International Journal of Cooperative Information Systems     Hybrid Journal   (Followers: 4)
Journal of Arts & Communities     Hybrid Journal   (Followers: 4)
International Journal of Information Communication Technologies and Human Development     Full-text available via subscription   (Followers: 4)
Medical Writing     Hybrid Journal   (Followers: 4)
Journal of Interactional Research in Communication Disorders     Hybrid Journal   (Followers: 4)
International Journal of Review in Electronics & Communication Engineering     Open Access   (Followers: 4)
International Journal of Autonomous and Adaptive Communications Systems     Hybrid Journal   (Followers: 3)
Magnetic Resonance Materials in Physics, Biology and Medicine     Hybrid Journal   (Followers: 3)
Solid State Nuclear Magnetic Resonance     Hybrid Journal   (Followers: 3)
Tijdschrift voor Communicatiewetenschappen     Full-text available via subscription   (Followers: 3)
Journal of Location Based Services     Hybrid Journal   (Followers: 3)
Etudes de communication     Open Access   (Followers: 3)
Communicatio : South African Journal for Communication Theory and Research     Hybrid Journal   (Followers: 3)
Language, Interaction and Acquisition     Hybrid Journal   (Followers: 3)
Sign Language & Linguistics     Hybrid Journal   (Followers: 3)
Kaleidoscope : A Graduate Journal of Qualitative Communication Research     Open Access   (Followers: 3)
Pacific Asia Journal of the Association for Information Systems     Open Access   (Followers: 3)
Journal of Community Informatics     Open Access   (Followers: 3)
Catalan Journal of Communication & Cultural Studies     Hybrid Journal   (Followers: 3)
Interactions : Studies in Communication & Culture     Hybrid Journal   (Followers: 3)
Performing Islam     Hybrid Journal   (Followers: 3)
International Journal of Intelligence Science     Open Access   (Followers: 3)
International Journal of Interdisciplinary Telecommunications and Networking     Full-text available via subscription   (Followers: 3)
Journal of International Communication     Hybrid Journal   (Followers: 3)
MediaTropes     Open Access   (Followers: 3)
Nonprofit Communications Report     Hybrid Journal   (Followers: 3)
International Journal of Monitoring and Surveillance Technologies Research     Full-text available via subscription   (Followers: 3)
Nordicom Review     Open Access   (Followers: 3)
Imaging Decisions MRI     Hybrid Journal   (Followers: 2)
Journal of Advertising Education     Hybrid Journal   (Followers: 2)
Journal of Cardiovascular Computed Tomography     Hybrid Journal   (Followers: 2)
Language Problems & Language Planning     Hybrid Journal   (Followers: 2)
Northern Lights     Hybrid Journal   (Followers: 2)
Research Journal of Information Technology     Open Access   (Followers: 2)
Science China Information Sciences     Hybrid Journal   (Followers: 2)
Área Abierta     Open Access   (Followers: 2)
MATRIZes : Revista do Programa de Pós-Graduação em Comunicação da Universidade de São Paulo     Open Access   (Followers: 2)
Comunicación y Medios     Open Access   (Followers: 2)
Empedocles : European Journal for the Philosophy of Communication     Hybrid Journal   (Followers: 2)
Journal of African Media Studies     Hybrid Journal   (Followers: 2)
Comunicación y sociedad     Open Access   (Followers: 2)
Digithum     Open Access   (Followers: 2)
Middle East Media Educator     Open Access   (Followers: 2)
Baltic International Yearbook of Cognition, Logic and Communication     Open Access   (Followers: 2)
TELKOMNIKA (Telecommunication, Computing, Electronics and Control)     Open Access   (Followers: 2)
Bioelectromagnetics     Hybrid Journal   (Followers: 1)
Radioelectronics and Communications Systems     Hybrid Journal   (Followers: 1)
The Poster     Hybrid Journal   (Followers: 1)
McMaster Journal of Communication     Open Access   (Followers: 1)
Palabra Clave     Open Access   (Followers: 1)
Ambitos     Open Access   (Followers: 1)
Revista Latina de Comunicacion Social     Open Access   (Followers: 1)
International Journal of Knowledge and Systems Science     Full-text available via subscription   (Followers: 1)
Journalistica - Tidsskrift for forskning i journalistik     Open Access   (Followers: 1)
Documentación de las Ciencias de la Información     Open Access   (Followers: 1)
Democratic Communiqué     Open Access   (Followers: 1)
International Journal of Trust Management in Computing and Communications     Hybrid Journal   (Followers: 1)
La Trama de la Comunicación     Open Access   (Followers: 1)
Questions de communication     Open Access  
Quaderni     Open Access  
Communication et organisation     Open Access  
Avatares de la Comunicación y la Cultura     Open Access  
La Mirada de Telemo     Open Access  
International Journal of Telework and Telecommuting Technologies     Full-text available via subscription  
Virtualidad, Educación y Ciencia     Open Access  
Revista Contracampo     Open Access  
Mediaciones Sociales     Open Access  
Historia y Comunicación Social     Open Access  
Revista Compolítica     Open Access  
Comunicació. Revista de recerca i d'anàlisi     Open Access  
Signo y Pensamiento     Open Access  
Pixel-Bit. Revista de Medios y Educacion     Open Access  
Cuadernos de Informacion     Open Access  
Ubiquity     Hybrid Journal  
Revista de Comunicación y Salud     Open Access  
Journal of Modern Periodical Studies     Full-text available via subscription  
Tic & société     Open Access  

        1 2 3 | Last

Similar Journals
Journal Cover
Science China Information Sciences
Journal Prestige (SJR): 0.462
Citation Impact (citeScore): 2
Number of Followers: 2  
 
  Hybrid Journal Hybrid journal (It can contain Open Access articles)
ISSN (Print) 1674-733X - ISSN (Online) 1869-1919
Published by Springer-Verlag Homepage  [2468 journals]
  • Simultaneous optimization of phononic and electronic transport in
           two-dimensional Bi2O2Se by defect engineering

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      Abstract: Defect engineering represents one degree of freedom to tune the physical and chemical properties of two-dimensional (2D) materials. Here, we demonstrate that the thermal and electronic properties of 2D Bi2O2Se can be optimized simultaneously by introducing oxygen defects. 2D Bi2O2Se and its oxygen-deficient counterpart (Bi2OxSe, x < 2) can be controllably synthesized by the chemical vapor deposition (CVD) method. By introducing oxygen defects, the thermal conductivity of 2D Bi2O2Se is reduced by nearly three times, achieving an extremely low thermal conductivity of 0.68 ± 0.06 W/mK at room temperature via the thermal bridge technique. This low thermal conductivity is enabled by the scattering of phonons by targeting of high-, mid-, and low-frequency phonons due to oxygen defects, strong anharmonicity, and nanostructure boundaries, respectively. Meanwhile, the mobility is also improved to 260–500 cm2·V−1·s−1 and the usual polar optical phonon scattering in 2D Bi2O2Se is weakened owing to the introduction of oxygen defects. Our results promise potential applications for thermoelectric design, nanoelectronics, and thermal barrier coating devices based on emerging 2D materials.
      PubDate: 2023-05-19
       
  • Multidimensional modulation of light fields via a combination of
           two-dimensional materials and meta-structures

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      Abstract: In recent years, researchers have increasingly directed their attention towards modulating light fields through the unique properties of two-dimensional materials and the free designability of meta-structures. Graphene, transition metal sulfides, transition metal nitrides, and other two-dimensional materials have emerged as star materials in recent years due to their extraordinary properties that are vastly different from those of traditional three-dimensional materials. As a result, these materials hold immense potential for further exploration and research. Taking advantage of the free designability of meta-structures can be an effective means of unlocking the full potential of 2D materials. Accordingly, this review presents an overview of recent research progress in the area of light field modulation achieved by combining 2D materials with meta-structures. The review initially covers the properties of 2D materials, followed by the concepts, principles, design, and preparation of meta-structures. Then the review delves into the concrete examples of the impact and effect of the combination on light field modulation. Lastly, the review concludes with a comprehensive summary and analysis of the current challenges and potential future developments of combining 2D materials with meta-structures.
      PubDate: 2023-05-19
       
  • Growth of uniformly doped black phosphorus films through versatile atomic
           substitution

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      Abstract: For the emerging excellent two-dimensional semiconductor black phosphorus (BP), doping has been proven as an effective way to tune its intrinsic properties. For the further development and expansion of BP-based research and application, the direct growth of doped BP films is highly desirable but still remains a challenge. In this work, the direct growth of uniformly doped-BP films on silicon substrates is achieved by a simple one-step vapor growth. The proposed decoupled feeding strategy significantly improves the effectiveness of doping and enables uniform dopant distribution in the grown films. The substitutional doping nature and high crystal quality of the grown doped films are confirmed by microscopy and crystal structural determination. Electrical transport measurement results reveal that Se and Te dopants perform mild electron doping effect and enable improve the electron mobility relative to pristine BP, while As dopant performs mild hole doping effect. It is believed that the direct growth of doped BP films in this work will facilitate the research development of BP in electronics and optoelectronics.
      PubDate: 2023-05-18
       
  • Performance analysis of full-duplex densely distributed MIMO with wireless
           backhaul

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      Abstract: In this paper, the spectral efficiency of a full-duplex (FD) densely distributed multi-input multi-output (MIMO) system with wireless backhaul is considered. In-band full-duplex (IBFD) backhauling, in which the backhaul and access transmissions take place on the same spectrum, is exploited for wireless backhauling to enable an efficient spectrum reuse. However, the severe cross-tier interference and cross-link interference reduce the gains of IBFD backhauling. To evaluate the achievable spectral efficiency with imperfect channel state information (CSI), we propose a two-phase channel estimation scheme to estimate the CSI for two wireless links, and the scheme estimates an effective interference CSI between access points (APs) based on beamforming training to perform interference cancelation at APs. Given the estimated CSI, the closed-form expressions of the uplink and downlink achievable rates with maximum ratio transmission beamforming and maximum ratio combining receivers, respectively, are derived with Gamma approximation. Numerical results verify the accuracy of the derived closed-form expressions and the effectiveness of the two-phase channel estimation scheme for interference cancelation. Moreover, compared with half-duplex densely distributed MIMO systems, FD systems with interference cancelation have a better performance.
      PubDate: 2023-05-18
       
  • Recent progress of layered memristors based on two-dimensional MoS2

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      Abstract: Memristors are memory-capable electronic components that consist of two terminals and a switching layer, whose resistance can be adjusted by an applied bias voltage. Two-dimensional (2D) materials with ultrathin layered structures are used as switching layers to overcome the limitations of traditional resistive materials in reducing the memristor sizes, demonstrating their potential in memory, flexible electronics, neuromorphic computing, and other related fields. Particularly, MoS2 is widely used as a representative 2D semiconductor, and the MoS2-based memristors have been intensively studied. In this review article, we have summarized the recent progress of MoS2-based memristors, including the fabrication process, device structure, device performance, switching mechanism, and synaptic applications. In addition, we also discussed the prospects and challenges for their future development.
      PubDate: 2023-05-18
       
  • A novel negative quantum capacitance field-effect transistor with
           molybdenum disulfide integrated gate stack and steep subthreshold swing
           for ultra-low power applications

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      Abstract: Various steep-slope devices based on novel structures and mechanisms garnered considerable attention for their potential in ultra-low power logic applications. In this work, a novel steep-slope negative quantum capacitance field-effect transistor (NQCFET) with molybdenum disulfide (MoS2)-integrated gate stack was realized by theoretical analysis and experimental evaluation. By combining the MoS2 equivalent capacitance model calibrated with experimental results, the NQCFET device model is further established. The results demonstrated that the optimized MoS2-integrated NQCFET can achieve a subthreshold swing (SS) of sub-60 mV/dec over a current range of 5 decades, with the minimum SS reaching 29 mV/dec, indicating the remarkable potential of MoS2-integrated NQCFETs for ultra-low power applications.
      PubDate: 2023-05-18
       
  • Reconfigurable spatial-parallel stochastic computing for accelerating
           sparse convolutional neural networks

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      Abstract: Edge devices play an increasingly important role in the convolutional neural network (CNN) inference. However, the large computation and storage requirements are challenging for resource- and power-constrained hardware. These limitations might be overcome by exploring the following: (a) error tolerance via approximate computing, such as stochastic computing (SC); (b) data sparsity, including the weight and activation sparsity. Although SC can perform complex calculations with compact and simple arithmetic circuits, traditional SC-based accelerators suffer from the low reconfigurability and long bitstream, further making it difficult to benefit from the data sparsity. In this paper, we propose spatial-parallel stochastic computing (SPSC), which improves the spatial parallelism of the SC-based multiplier to the full extent while consuming fewer logic gates than the fixed-point implementation. Moreover, we present SPA, a highly reconfigurable SPSC-based sparse CNN accelerator with the proposed hybrid zero-skipping scheme (HZSS), to efficiently take advantage of different zero-skipping strategies for different types of layers. Comprehensive experiments show that SPA with up to 2477.6 Gops/W outperforms existing several binary-weight accelerators, SC-based accelerators, and the sparse CNN accelerator considering energy efficiency.
      PubDate: 2023-05-17
       
  • An end-to-end network for co-saliency detection in one single image

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      Abstract: Co-saliency detection within a single image is a common vision problem that has not yet been well addressed. Existing methods often used a bottom-up strategy to infer co-saliency in an image in which salient regions are firstly detected using visual primitives such as color and shape and then grouped and merged into a co-saliency map. However, co-saliency is intrinsically perceived complexly with bottom-up and top-down strategies combined in human vision. To address this problem, this study proposes a novel end-to-end trainable network comprising a backbone net and two branch nets. The backbone net uses ground-truth masks as top-down guidance for saliency prediction, whereas the two branch nets construct triplet proposals for regional feature mapping and clustering, which drives the network to be bottom-up sensitive to co-salient regions. We construct a new dataset of 2019 natural images with co-saliency in each image to evaluate the proposed method. Experimental results show that the proposed method achieves state-of-the-art accuracy with a running speed of 28 fps.
      PubDate: 2023-05-17
       
  • AtomGAN: unsupervised deep learning for fast and accurate defect detection
           of 2D materials at the atomic scale

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      Abstract: The extraction of atomic-level material features from electron microscope images is crucial for studying structure-property relationships and discovering new materials. However, traditional electron microscope analyses rely on time-consuming and complex human operations; thus, they are only applicable to images with a small number of atoms. In addition, the analysis results vary due to observers’ individual deviations. Although efforts to introduce automated methods have been performed previously, many of these methods lack sufficient labeled data or require various conditions in the detection process that can only be applied to the target material. Thus, in this study, we developed AtomGAN, which is a robust, unsupervised learning method, that segments defects in classical 2D material systems and the heterostructures of MoS2/WS2 automatically. To solve the data scarcity problem, the proposed model is trained on unpaired simulated data that contain point and line defects for MoS2/WS2. The proposed AtomGAN was evaluated on both simulated and real electron microscope images. The results demonstrate that the segmented point defects and line defects are presented perfectly in the resulting figures, with a measurement precision of 96.9%. In addition, the cycled structure of AtomGAN can quickly generate a large number of simulated electron microscope images.
      PubDate: 2023-05-17
       
  • Mining KPI correlations for non-parametric anomaly diagnosis in wireless
           networks

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      Abstract: The increase in mobile data traffic has imposed unprecedented pressure on wireless network management. KPI-based anomaly diagnosis can alleviate such pressure by automatically identifying the cause of abnormalities in the traffic and providing end-to-end monitoring and optimization. Previous approaches mainly focus on finding a subset of anomaly-inducing KPIs on the basis of supervised learning procedures. These studies have two possible limitations: (1) the inherent correlations between KPIs that are proven to be effective for the anomaly diagnosis, are still largely underexplored; (2) machine learning models heavily rely on human annotations, which are expensive and labor-intensive. Therefore, we propose random matrix theory-based KPI identification (RKI), a novel method that automatically mines rich interactions between KPIs for anomaly diagnosis without using any learnable parameters or human annotations. Specifically, RKI diagnoses the abnormal KPIs in two steps. First, we build a matrix for anomaly KPI detection to mine the spectrum of its covariances. Second, another new matrix is reconstructed to calculate the correlation difference. By doing so, the anomaly KPIs that have larger correlation difference scores can be efficiently identified in the wireless traffic without any trainable parameters. In extensive experiments on a public dataset, RKI yields a 6.5% higher true diagnostic rate and 11.36% lower false alarming rate than the statistical model, demonstrating its effectiveness. A 100 × larger scale synthetic dataset also demonstrates the capabilities of RKI to explore massive data traffic under real-word scenarios. Finally, we discuss RKI’s potential applications of our method in future 6G wireless networks.
      PubDate: 2023-05-10
       
  • Near-infrared optoelectronic synapses based on a Te/α-In2Se3
           heterojunction for neuromorphic computing

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      Abstract: Neuromorphic computing based on artificial optoelectronic synapses has attracted considerable attention owing to its high time/power efficiency and parallel processing capability. However, existing devices are mainly suitable for only the visible range. Here, high-performance near-infrared optoelectronic memories and synapses were demonstrated using Te/α-In2Se3 heterostructures. Owing to the entangled ferroelectricity-semiconducting properties of α-In2Se3, whose ferroelectric polarizations can be switched by photocarriers that migrated from the Te near-infrared light absorber, the device could be set into a non-volatile high-resistance/low-resistance state through the application of positive gate voltages/near-infrared light pulses. Hence, the device could function as a high-performance photodetector, with a photoresponsive on/off ratio of 5.25 × 104/8.3 × 103 and a specific detectivity of 2.6 × 1011/7.5 × 1010 Jones at 1550/1940 nm. In addition, the device could function as a multi-state optoelectronic synapse with good stability and high linearity; moreover, using the device, we developed an optoelectronic artificial neural network with high recognition accuracies of 100% and 89.9% for a database composed of 64-pixel letters with 10% and 70% noise levels, respectively. Our work provides a feasible avenue for developing neuromorphic networks applicable in the infrared range.
      PubDate: 2023-05-10
       
  • Event-triggered tracking control for a class of nonholonomic systems in
           chained form

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      Abstract: In this study, the event-triggered asymptotic tracking control problem is considered for a class of nonholonomic systems in chained form for the time-varying reference input. First, to eliminate the ripple phenomenon caused by the imprecise compensation of the time-varying reference input, a novel time-varying event-triggered piecewise continuous control law and a triggering mechanism with a time-varying triggering function are developed. Second, an explicit integral input-to-state stable Lyapunov function is constructed for the time-varying closed-loop system regarding the sampling error as the external input. The origin of the closed-loop system is shown to be uniformly globally asymptotically stable for any global exponential decaying threshold signals, which in turn rules out the Zeno behavior. Moreover, infinitely fast sampling can be avoided by appropriately tuning the exponential convergence rate of the threshold signal. A numerical simulation example is provided to illustrate the proposed control approach.
      PubDate: 2023-05-10
       
  • Selective enriching of trionic emission in a WS2-ZnO hybrid through
           type-II band alignment

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      Abstract: Strategies to modulate the exciton dynamics in ultrathin two-dimensional (2D) semiconductors have always been an integral component in the bid towards improved optoelectronics and quantum photonic devices. The capability to non-destructively tune the relaxation dynamics, valley polarization, binding energies, and population ratio of various excitonic species has been well-sought for advanced applications. Through the rationale design of a WS2-ZnO hybrid platform, we present a distinct increment in the trion-to-exciton ratio for WS2 emission across a patterned heterostructure. The shift in dominant excitonic species arose due to the efficient charge segregation at the spatially confined interface of the type-II heterostructure. Owing to the charge transfer process, the resultant emission profile presents up to four times amplification in the trion-to-exciton ratio, with temperature variable trion binding energies up to 59 meV. Since trions possess non-zero charge and spin degrees of freedom, the provision of a higher density of trions with increased binding stability would encourage new opportunities for reproducible optoelectronics and quantum emitters.
      PubDate: 2023-05-10
       
  • Two-dimensional materials-based integrated hardware

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      Abstract: In recent years, two-dimensional (2D) materials-based fundamental preparing process such as high-quality wafer-level single crystal thin film synthesis technology and high-performance electrode preparing technology has developed rapidly. In addition, the integrated application prospect of 2D materials has been preliminarily verified, owing to the flat and clean interface between 2D materials and substrates. From the perspective of electronics and optoelectronics based on 2D materials, this paper will summarize the recent studies of integrated circuit hardware, integrated optoelectronic hardware, and hetero-integrated hardware, showing their advantages and potential application.
      PubDate: 2023-05-10
       
  • Design and implementation of Chinese libration point missions

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      Abstract: Libration points are vital for lunar and deep space explorations because of their unique positions and dynamics. This paper first traces the development of relevant missions since ISEE-3 and then presents the details of the trajectory design and implementation of four Chinese libration point missions in the lunar exploration project: the two Sun-Earth libration point missions by CHANG’E-2 and CHANG’E-5 and the two lunar libration point missions accomplished by CHANG’E-5T1 and Queqiao. The orbit technologies for these libration point missions are also elaborated on regarding trajectory design, maneuvering, and tracking, as well as orbit determination. This paper is expected to provide a reference for future cislunar and deep space exploration.
      PubDate: 2023-05-09
       
  • Fault detection and isolation for linear parameter-varying systems with
           time-delays: a geometric approach

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      Abstract: Fault detection and isolation (FDI) problems for linear parameter-varying (LPV) systems with state time-delays are studied in this paper. By defining the concept of unobservability subspace and designing its calculation algorithm, the geometric approach is introduced to the time-delay LPV systems. Utilizing Wirtinger-based integral inequality, we obtain a sufficient condition to solve the so-called H∞-based residual generation problem for the LPV systems. In this paper, we consider two cases: the time delay is known and the time delay is unknown but its estimated value can be obtained. Corresponding observers are proposed for both cases based on the geometric approach and H∞ techniques. Lyapunov-Krasovskii functional is utilized to handle the time-delays and Wirtinger’s inequality is employed to reduce conservatism. Numerical examples are presented to demonstrate the effectiveness of the proposed approach.
      PubDate: 2023-05-09
       
  • Randomized multimodel multiple hypothesis tracking

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      PubDate: 2023-04-23
       
  • Feedback is all you need: from ChatGPT to autonomous driving

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      PubDate: 2023-04-23
       
  • Cy-CNN: cylinder convolution based rotation-invariant neural network for
           point cloud registration

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      Abstract: Point cloud registration is a challenging problem in the condition of large initial misalignments and noises. A major problem encountered in the registration algorithms is the definition of correspondence between two point clouds. Point clouds contain rich geometric information and the same geometric structure implies the same feature even if they are in different poses, which motivates us to seek a rotation-invariant feature representation for calculating the correspondence. This work proposes a rotation-invariant neural network for point cloud registration. To acquire rotation-invariant features, we firstly propose a rotation-invariant point cloud representation (RIPR) at the input level. Instead of using the original coordinates, we propose to use point pair features (PPF) and the transformed coordinates in the local reference frame (LRF) to represent a point. Then, we design a new convolution operator named Cylinder-Conv which utilizes the symmetry of cylinder-shaped voxels and the hierarchical geometry information of the surface of 3D shapes. By specifying the cylinder-shaped structures and directions, Cylinder-Conv can better capture the local neighborhood geometry of each point and maintain rotation-invariance. Finally, we combine RIPR and Cylinder-Conv to extract normalized rotation-invariant features to generate the correspondence and perform a differentiable singular value decomposition (SVD) step to estimate the rigid transformation. The proposed network presents state-of-the-art performance on point cloud registration. Experiments show that our method is robust to initial misalignments and noises.
      PubDate: 2023-04-23
       
  • Attack detectability and stealthiness in distributed optimal coordination
           of cyber-physical systems

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      PubDate: 2023-04-21
       
 
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