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We report that MBE-grown three-dimensional (3D) topological Dirac semimetal Cd3As2 thin-film exhibits remarkable saturable absorption effects at 1, 1.5 and 2 μm. A mode-locked Tm fiber laser is demonstrated using such a SESAM-like material.
We demonstrate an optically-driven artificial synapse based on a graphene hybrid phototransistor. Both optical memory function (long-term plasticity) and logic operations are achieved, which adds important new capabilities to photonics enabled neuromorphic computing.
This paper presents the joint design of network coding and backpressure algorithm for cognitive radio networks and its implementation with software-defined radios (SDRs) in a high fidelity network emulation testbed. The backpressure algorithm is known to provide throughput optimal solutions to joint routing and scheduling for dynamic packet traffic. This solution applies to cognitive radio networks...
This paper presents a novel approach to launch and defend against the causative and evasion attacks on machine learning classifiers. As the preliminary step, the adversary starts with an exploratory attack based on deep learning (DL) and builds a functionally equivalent classifier by polling the online target classifier with input data and observing the returned labels. Using this inferred classifier,...
This paper studies the problem of routing in a multilayer (communication and social) network. Network protocols, such as link state routing and its variants, heavily used in mobile ad hoc networks (MANETs) cannot sustain robustness and efficiency as the topological information becomes easily stale with fast network dynamics. Attempts to collect and exchange excessive network information would result...
Due to the openness of the physical layer, the physical layer security has been widely discussed. It is considered as an effective way to improve the secrecy rate that we add artificial noise to D2D communications underlaying cellular networks. Compared to previous studies, in this paper we not only think of the situation where artificial noise is added to the original communication signal between...
This paper presents an energy optimization based planning method for grasping bottles on an assembly line with a constant velocity using a seven-DOF robotic arm. The interception region is the intersection of the assembly line and the workspace of the end-effector of the robot. There will be a dedicated optimal final pose in the interception region when grasping occurs so that the robot consumes least...
This paper presents an exploratory machine learning attack based on deep learning to infer the functionality of an arbitrary classifier by polling it as a black box, and using returned labels to build a functionally equivalent machine. Typically, it is costly and time consuming to build a classifier, because this requires collecting training data (e.g., through crowdsourcing), selecting a suitable...
This paper presents a study performed to evaluate the benefits of stress control metrology in Silicon Germanium (SiGe) epitaxy. Various in-line and off-line metrology tools are studied and compared, such as using OCD (Optical Critical Dimension) to monitor SiGe profile, using SE (Spectroscopic Ellipsometry), HRXRD (High Resolution X-ray Diffraction), SIMS (Secondary Ion Mass Spectrometry) to achieve...
X-ray photoelectron spectroscopy (XPS) can be used for surface layer characterization. Thin film thickness and composition can be determined. This paper presents a study performed to evaluate the benefits of high-k metal gate films measurement using a novel and high throughput in-line XPS technique. Various thin films such as SION and HfO2 are measured. The strengths and drawbacks of XPS are presented...
A novel light-activated artificial synapse based on graphene/nanotube hybrid phototransistor is reported. Tunable synaptic weight and short-term synaptic plasticity behaviors are for the first time demonstrated using optical laser pulses.
This paper presents an analytical model of a multi-layer (social-communication) network supported with on-the-fly learned and prior social-cognitive features. In this model, routing is formulated in a distributed setting where each node operating with local information only finds the next-hop node, among all social and mobile ad hoc network (MANET) communication link neighbors, whose normalized delay...
This paper presents a force-level planning approach to optimally select and design the orbit of an airborne relay. The objective is to maximize the aggregate performance of communication subscribers served by the airborne relay. The performance is measured as either the duty cycle in terms of signal-to-noise-ratio or the throughput achieved by communication subscribers. Both measures are computed...
Distributed denial-of-service(DDoS) attacks have recently emerged as a major threat to the security and stability of the Internet. As we know, traffic bursts always go with DDoS attacks. Detecting the network traffic bursts accurately in real-time can catch such attacks as quickly as possible. In this paper, we categorize the traffic bursts into three kinds: Single-point-burst, Short-flat-burst and...
Aiming at improving the detecting probability of weak target and adaptability in multi-clutter background, a new CFAR processing method based on DB4 wavelet (WT-FS-CFAR) is proposed. The proposed method can deal with the wavelet coefficients of the echo signal adaptively and reconstruct a new echo signal. Compared with typical CFAR processor, experimental results show that the proposed method could...
The evolutionary process of nanoscale FinFET channel was investigated under hydrogen thermal treatment using kinetic Monte Carlo (KMC) simulation. We adopt appropriate activation energy to analyze the influence of hydrogen treatment temperatures and time on fin structure. Line edge roughness (LER) of silicon fin structure is effectively reduced in present KMC model. Our results indicate that optimized...
Aiming at achieving high-performance and efficient routing in network-on-chip, a new adaptive STR routing algorithm is proposed based on SRNoC topology in this paper. The proposed routing algorithm can choose the routing paths dynamically and enables the routing hops within 2 between any source nodes and destination nodes. It is mainly made up of router injection port selection and TM output port...
This paper presents a robust dynamic spectrum access (DSA) decision making framework for a satellite communication (SATCOM) system with primary users (PUs) and secondary users (SUs) operating in the presence of cognitive jammers. Different levels of uncertainty are considered for the channel availability under SATCOM delays and jamming effects. Spectrum uncertainty is quantified regarding the parameter...
Two-dimensional transition-metal dichalcogenides (TMDs) represent a promising class of materials for electronic and photonic devices, benefiting from their sizable bandgap of 1–2eV and ultrathin body. However, one of the major issues is that the experimental mobility is much lower than the theoretical phonon limit. We carry out systematic investigations on the electron transport and field-effect transistors...
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