Low-rate Denial of service (LDoS) attacks has become one the biggest threats to Internet, cloud computing platforms, and big data centers. As an evolutionary species DDoS attack, LDoS attack is essentially different from attack. are behavior malicious blocking legitimate network traffic by destroying targets infrastructure around it with huge traffic. While, intentional degrading quality TCP links throttling flows a small fraction its ideal rate periodic pulse sequence. Hence, very flow...

Improving stability is a major aspect for commercial application of perovskite solar cells (PSCs). The all-inorganic CsPbBr3 material has been proven to have excellent stability. However, the film small range light absorption and serious charge recombination at interface or inside device, so power conversion efficiency still lower than that organic-inorganic hybrid one. Here, we successfully fabricate high-quality films via additive engineering with NH4SCN. By incorporating NH4+...

As an emerging distributed machine learning (ML) method, federated (FL) can protect data privacy through collaborative of artificial intelligence (AI) models across a large number devices. However, inefficiency and vulnerability to poisoning attacks have slowed FL performance. Therefore, blockchain-based asynchronous (BAFL) framework is proposed ensure the security efficiency required by FL. The blockchain ensures that model cannot be tampered with while speeds up global aggregation. A novel...

As the traffic of local content sharing grows rapidly, device-to-device multicast (D2MD) is introduced into 5G cellular networks, enabling offloading from base stations to device direct transmissions and improved energy spectrum efficiency. In context, social attributes mobile users have special concerns generate effective D2MD groups links, due reuse licensed spectrum, interference between should be carefully mitigated. This article presents a scheme for in networks by taking account...

Transition-metal sulfides have been regarded as perspective anode candidates for high-energy Na-ion batteries. Their application, however, is precluded severely by either low charge storage or huge volumetric change along with sluggish reaction kinetics. Herein, an effective synergetic Sn incorporation-Zn substitution strategy proposed based on copper-based sulfides. First, capability of copper sulfide significantly improved via incorporating alloy-based element. However, this process...

Narrowband thermally activated delayed fluorescence (TADF) materials have received widespread attention due to their promising applications in organic light-emitting diodes with high-definition displays. Great efforts been done achieve full-color narrowband emissions donor–acceptor (D–A) and multiple-resonance (MR) TADF materials. In comparison the D–A materials, MR-based basically showed smaller full width at half-maximum (fwhm) of spectra owing inherent structural vibration inhibition...

To cope with the limited radio and power resources, designing energy- cost-efficient resource allocation strategy RAN slicing scheduling is important in ensuring extreme QoS of differentiated Internet things (IoT) services. In this regard, we focus on guaranteeing latency reliability sporadic uRLLC uplink traffic while improving quality continuous eMBB services (e.g., video) together paper. Firstly, a dynamic optimization model considering consumption service used to construct cost function...

By leveraging the 5G enabled V2X networks, vehicles connected by cellular base-stations can support a wide variety of computation-intensive services. In order to solve arisen challenges in end-to-end low-latency transmission and backhaul resources, mobile edge computing (MEC) is now regarded as promising paradigm for 5G-V2X communications. Considering importance both reliability delay vehicle communication, this article innovatively envisions joint computation URLLC resource allocation...

The Industrial Internet of Things (IIoT) is one the important applications under 5G massive machine type communication (mMTC) scenario. To ensure high reliability IIoT services, it necessary to apply an efficient resource allocation method dynamic and complex environment. In view absence energy-efficient management architecture for entire network, this article proposes intelligent-driven green mechanism heterogeneous networks. First, intelligent end-to-end self-organizing framework service...

Federated learning (FL) is seen as a road toward privacy-preserving distributed artificial intelligence while keeping raw training data on local devices. By leveraging blockchain, this article puts forward blockchain and FL fusioned framework to manage the security trust issues when applying over mobile edge networks. First, two-layered architecture proposed that consists of two types blockchains: model update chain (LMUC) assisted by device-to-device (D2D) communication global (GMUC)...

Multiaccess edge computing (MEC) provides users with better Quality of Experience (QoE) via offloading tasks to the nearby edge. However, emergence new Internet Things applications multiple and repeated requests brings redundant computation transmission Meanwhile, current method based on deep reinforcement learning (DRL) has low sampling efficiency slow convergence issues for training in a changing environment. Therefore, improving QoE services is still ultimate challenge. In this article,...

With the ever-increasing demands for popular content sharing among humans, device-to-device (D2D) multicast communication, as a promising technology to support wireless services within local area, is introduced in 5G cellular network. However, existing resource allocation approaches D2D communication usually consider only physical domain constraints but neglect social factors, which would result ineffective links between users unwilling share interests. Different from works, scheme proposed...

Software defined network (SDN) develops a centralized control plane to manage the whole network. If scale of is large, it necessary deploy multiple distributed controllers. In SDN, switch can only work by relying on flow tables received from its controller. Therefore, controller placement an important problem keep switches working efficiently and improve reliability network, which consists controllers, communication paths between them. However, existing approaches are not effective or do...

The CsPbIBr 2 perovskite has obvious advantages in balancing the stability and efficiency inorganic solar cells (PSCs). Its large bandgap of 2.08 eV, which leads to a narrow spectral absorption (<600 nm), is key limit yielding high power conversion (PCE). Herein, it demonstrated that by integrating thin bulk‐heterojunction (BHJ) layer (19 nm) composed typical poly (3‐hexylthiophene‐2,5‐diyl) [6,6]‐phenyl methyl C61 butyric acid ester (P3HT:PCBM) with perovskite, carbon‐based all‐inorganic...

With the development of Internet Things, trust has become a limited factor in integration heterogeneous IoT networks. In this regard, we use combination blockchain technology and SDN/NFV to build network resource management model based on consortium chain. order solve efficiency problem caused by full amount data chain, deploy light nodes for At same time, idea identification realize separation information, application mode on-chain off-chain resources endogenous management. We also propose...

6G edge networks strive to offer ubiquitous intelligent services, requiring a greater emphasis on network stability and reliability. However, current present low automation degree of the operation, administration maintenance process. Consequently, active service migration away from abnormal nodes links, as well automatic transparent recovery sudden anomalies, become challenging tasks. These conditions underscore urgency for an innovative self-healing mechanism networks. Digital twin (DT)...

CsPbBr 3 quantum dots embedded in KIT-6 to form silica-shell-protected heterogeneous photocatalysts, which were further combined with chiral organocatalysts forming dual-catalysts explore the activity and stereoselectivity asymmetric catalysis.

Although carbon-based all inorganic perovskite solar cells (C-PSC) reflect a balance between low cost and stability. However, the inherent structural defects of films energy level mismatch limit performance device. Herein, (3-bromopropyl) trimethylammonium bromide (BPTAB) is used as interface regulator in CsPbIBr2 PSC. Thereby not only effectively reduces offset facilitates hole extraction delocalization, also improves photosensitive layer quality inhibited carrier recombination. After...