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Smartphone» have become a prime target for cyber criminals. Android being the market leader is the major target of malicious attackers. Covert techniques used by the malware make them hard to detect with signature based methods. In this paper, we present AndroPIn — a novel Android based malware detection tool using Permissions and Intents. The proposed framework overcomes the limitation of stealthy...
Although 2D LiDAR based Simultaneous Localization and Mapping (SLAM) is a relatively mature topic nowadays, the loop closure problem remains challenging due to the lack of distinctive features in 2D LiDAR range scans. Existing research can be roughly divided into correlation based approaches e.g. scan-to-submap matching and feature based methods e.g. bag-of-words (BoW). In this paper, we solve loop...
In this paper, we present a method for hardening memory and sequential cells against soft errors. The effect of the ionizing particle on the bulk potential is exploited to prevent the induced SET from propagating in the circuit. The proposed method requires a minimum number of extra transistors. The solution is applied to D Flip-Flop design, and alpha and heavy-ions test results are presented.
The Sentinel-2A (S2A) Multi-Spectral Imager (MSI) is a new remote sensor launched on 23 June 2015 that provides unprecedented Earth observation with high spatial, spectral and temporal resolutions. It has high potential for chlorophyll content estimation. Chlorophyll content plays a crucial role in plant photosynthesis affecting the terrestrial carbon cycle. In this research, a physical retrieval...
The recent development on micro aerial vehicles (MAV), especially the unmanned quadrotor proposes increased requirements on reference generation. This paper proposed a dynamically feasible, state constrained and smooth trajectory generation method using B-spline. The reference can be shown to satisfy the dynamics of the quadrotor and accurate tracking performance is guaranteed. The algorithm can be...
We present our recent researches on novel group IV nano- and micro-structures for potential light sources on Si, including the tensile strained Ge quantum dots (QDs), GeSn thin films and microstructures, and Ge(Sn) nanowires. Tensile-strained Ge QDs were grown by SS-MBE, and photoluminescence was achieved. The GeSn thin films were demonstrated with Sn concentration above the bandgap transition critical...
This paper presents a model based robust control scheme for tail-sitter hybrid Unmanned Aerial Vehicles (UAVs) in forward transition phase. To tackle the problem from high nonlinearity and uncertainties in transition dynamics, a comprehensive model form is constructed, and a so-called Robust Perfect Tracking (RPT) control method is utilized in attitude tracking. Experiment results are given to demonstrate...
This paper presents a systematic control synthesis method in order to achieve auto-transition for KH-Lion, a tail-sitter hybrid UAV. Although there are huge potentials in various applications of the hybrid tail-sitter UAVs, the transition between vertical take-off and landing mode and cruise mode is still a challenge now. Due to the complex behaviour that the transition can generate, it is very difficult...
Accurate mathematical models especially accurate hydrodynamic parameters of unmanned underwater vehicles (UUVs) are essential for good control performance. This paper provides a general framework for the hydrodynamic modeling of a small-scale UUV. In place of physical experiments such as captive model tests, a virtual model test and simulation was conducted via commercial computational fluid dynamics...
A nonlinear model of a flapping-wing micro aerial vehicle (MAV) is built in which the load acceleration and equivalent moment are formulated linearly in the body frame. The aerodynamic force and moment are not considered directly because the mass and moment of inertia of the flapping-wing MAV are too tiny. The visual measurement system (VMS) is taken to measure the flight data such as the position...
This paper presents a comprehensive modeling approach for tail-sitter hybrid UAVs featured by vertical take-off and landing (VTOL) and cruise flight capabilities. The modeling approach includes all essential components, such as full angle of attack envelope wing and fuselage aerodynamics, sideslip wind effect and actuator dynamics. A unified formulation comprising all model components is derived to...
In this work, we present the development of a target tracking and following system using a self-customized hybrid UAV, KH-Lion. KH-Lion is a small and autonomous tail-sitter UAV stabilized and controlled by two vectored propulsion systems. A target tracking system was developed on this platform for autonomous target following on a predetermined moving object on the ground. A customized AprilTag marker...
Three-dimensional (3D) fanout package stacking offers new levels of performance, high-density integration, and form factor advantages. Known-good fanout packages are stacked, and the vertical connection is built through Cu pillars in the molding area and solder bumps. Compared to existing TSV-based 3D integrated circuits (3DIC) technology, this solution reduces thermal crosstalk when integrating devices...
Three-dimensional (3D) fanout package stacking offers new levels of performance, high-density integration, and form factor advantages. Known-good fanout packages are stacked, and the vertical connection is built through Cu pillars in the molding area and solder bumps. Compared to existing TSV-based 3D integrated circuits (3DIC) technology, this solution reduces thermal crosstalk when integrating devices...
WLCSP has been widely adopted for package solution of the portable and wearable electronics products by its advantages of very low package cost and good electrical performance. Knowing WLCSP provide almost no protection to silicon IC chip, its quality and reliability performance becomes critical for successful product application. A 28nm TV with extreme Low-k inter-metal-dielectic material (ELK IMD)...
As a promising candidate applied in direct-drive applications due to high torque characteristics at low speed, vernier permanent-magnet (VPM) machines have been paid increasingly attention in many direct-drive fields, such as electric vehicle propulsion and wind power generation [1–2].
The commercial release of byte-addressable persistent memories, such as Intel/Micron 3D XPoint memory, is imminent. Ongoing research has sought mechanisms to allow programmers to implement recoverable data structures in these new main memories. Ensuring recoverability requires programmer control of the order of persistent stores; recent work proposes persistency models as an extension to memory consistency...
A new bidirectional DC-DC converter based on switched-capacitor-inductor cell was proposed. It features: high step-up/down conversion ratio with a moderate duty cycle; low voltage stress on the switches; non-pulsating input current (step-up mode); easiness of control and driving circuit. The proposed converter contains five switches and four reactive elements (two capacitors and two inductors). It...
Rate control scheme plays a vital role in the circumstances of region-of-interest (ROI) based video coding, aiming to allocate a higher bit rate to the ROI while setting a relative lower bit rate ratio in non-ROI to maintain the total bit rate close to the assigned target value. Among various rate control models, the R-Lambda based rate control model outperforming other models. Unfortunately, the...
In operations research, the cutting-stock problem is an important issue in the manufacturing of textile, leather, paper, ship building, and sheet metal industries. This problem arranges the specific profiles on the material with minimum material wasted. It can increase the utility rate and reduce the cost of the stock. For example in the leather industry, the stock has irregular profiles, and the...
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