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The research on the future high-speed communication systems has already reached the critical point with better continuous transmission and higher system capacity especially for the on-board users in the high-speed trains. However, due to the inflexible architecture of current cellular networks where Internet access schemes served by multiple Internet Service Providers lack effective coordination,...
This paper proposes a new optimal cooperative jamming (CJ) strategy in the analog network coding (ANC) system against both external and internal eavesdroppers. Firstly, we derive the ANC system security capacity with CJ against eavesdroppers. On this basis, we analyze the jamming power allocation between two time slots subject to a total jamming power constraint. The simulation results show that using...
Well-aligned hexagonal GaN pyramids on the top of GaN nanocolumn arrays have been achieved successfully by the two-step method. Fistly, the well-aligned nanocolumn arrays are fabricated by UV-curing nanoimprint lithography. Next, the GaN pyramids are regrown on the top of GaN nanocolumn arrays by RF-plasma assisted molecular beam epitaxy. The as-grown GaN nanostructures are characterized by the in-situ...
This paper investigates the cooperative communication system with untrusted relay using the new scheme that the source transmits the jamming signals and the source signals at the same time. We exploit greedy power allocation algorithm to divide the source power to ensure maximum secrecy capacity. Besides, we analyze the situation that external eavesdropper and untrusted relay exist at the same time...
We aim to develop a new self-reconfigurable modular robot, Cross-Ball, so that we can apply bio-inspired morphogenesis mechanisms to modular robots to adapt to dynamic environments automatically. To this end, the mechanical design of modular robots has to be flexible and robust enough for various complex configurations. The major contributions of the design of this Cross-Ball robots include: 1) it...
In this paper, we present a two-layer hierarchical mechanochemical model for self-reconfiguration of modular robots in changing environments. The model, which is inspired by the embryonic development of multi-cellular organisms and chemical morphogenesis, can autonomously generate and form different patterns for modular robots to adapt to environmental changes. Layer 1 of the model utilizes a virtual-cell...
In security defense tasks, multiple robots need work cooperatively to detect offensive intrusion to protect some sensitive areas. In this paper, we propose a distributed algorithm for a multi-robot system with some static sensors. The system concept is that static sensors sense intrusions and act as a cueing sensor to an ensemble of robots. These robots in turn engage the potential intruder, performing...
In this paper, we proposed a dual flit transmission rate (DFTR) router architecture according to the property of short distance for the inter-wafer links for 3D Network on Chip (NoC). The equivalent bandwidth of the inter-wafer links can be N times wider than that of the intra-wafer links, since flit transmission rate in vertical direction can be N times fast than that in the horizon direction. Thus,...
Low density parity check (LDPC) codes over GF(2m) show significantly higher performances than binary LDPC codes. However, the hardware complexity and area of the decoder are largely increasing. In this paper, putting the code and decoder design together to consider, we propose a FPGA semi-parallel implementation of extended min-sum (EMS) decoding algorithm for quasi-cyclic low density parity check...
In this paper, we propose an autonomous system consisting of cooperative mobile robots and fiber optic sensors (FSs) for intruder detection in perimeter defense tasks. The system concept is that FSs will sense perimeter intrusions and act as a cueing sensor to an ensemble of robots. These robots in turn engage the potential intruder, performing surveillance and/or neutralization of the intrusion....
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