Focused on the high computational time complexity of the depth map based Synthesized View Distortion Change (SVDC) algorithm in 3D High Efficiency Video Coding (3D-HEVC), a new parallelization method of SVDC algorithm based on hybrid granularity was proposed under the reconfigurable array structure. Firstly, the SVDC algorithm was divided into two parts:Virtual View Synthesis (VVS) and distortion value calculation. Secondly, the VVS part was accelerated by pipeline operation, and the distortion value calculation part was accelerated by dividing into two levels:task level, which means dividing the synthesized image according to pixels, and instruction level, that is dividing the distortion values inside the pixel by the calculation process. Finally, a reconfigurable mechanism was used to parallelize the VVS part and distortion value calculation part. Theoretical analysis and hardware simulation results show that, in terms of execution time, the proposed method has the speedup ratio of 2.11 with 4 Process Elements (PEs). Compared with the SVDC algorithms based on Low Level Virtual Machine (LLVM) and Open Multi-Processing (OpenMP), the proposed method has the calculation time reduced by 18.56% and 21.93% respectively. It can be seen that the proposed method can mine the parallelism of the SVDC algorithm, and effectively shorten the execution time of the SVDC algorithm by combining with the characteristics of the reconfigurable array structure.

A group key management scheme based on distributed Path Computation Element (PCE) architecture was proposed aiming at the communication characteristics and key management requirement of multi-domain optical networks in PCE architecture. Firstly, the key relation of multi-domain optical network under distributed PCE architecture was modeled as a two-layer key hypergraph by using hypergraph theory. Then, the key management method based on self-authenticated public key cryptosystem and member filtering technique was adopted in the autonomous domain layer and the group key agreement method based on elliptic curve cryptosystem was adopted in the PCE layer. Finally, the generation, distribution, update and dynamic management of the key were completed, and the confidentiality problem of the private key of member and the impersonation problem of the third party node were well solved. At the same time, the computational overhead of key update was reduced. The performance analysis shows that the proposed scheme has forward security, backward security, private key confidentiality and is against collusion attack. Compared with the typical decentralized scheme, the proposed scheme achieves better performance in terms of key storage capacity, encryption/decryption times and communication overhead.

How to ensure the survivability of static multicast business has become a widespread concern in the multi-domain optical network of pre-configured multicast business. Concerning the above problem, by adopting the global topological information and scheduling calculation model based on hierarchical Path Computation Element (PCE) architecture, a bimatrix game model was used to generate link-disjoint multicast trees and multicast protected trees, finally hierarchical PCE-based and bimatrix game-based multicast dedicated protection algorithm was put forward under static state, and concrete examples of the algorithm were given. Theoretical analysis and experimental results show that under certain redundancy allocation of network resources, the proposed algorithm has low time complexity, and it can obviously improve the multicast business survivability in multi-domain optical network under static state, with optimizing resources allocation structure of protection work in the optimal multicast working trees and multicast protected trees at the same time.

For the low-speed instability problem of speed sensor-less vector control system of induction motor based on full-order flux observer, the unstable reason of observer at the low-speed generation region was analyzed by applying Popov's hyperstability theory, and a design criteria of feedback gain was proposed to stabilize the observer at low-speed mode. A stability analysis process was simplified based on rotor flux orientation and a multi-dimensional problem about the system poles stability was transformed into a one-dimensional problem about system zeros stability by using Routh-Hurwitz criterion. Furthermore, the stability condition of speed estimation system was derived and a design method of stability feedback gain was obtained. The simulation results show that the speed estimation system can work stably at a low speed of 50 revolutions per minute and a very low speed of 10 revolutions per minute. Compared with the traditional poles assignment approach, the system has better convergence and stability performance at low-speed generation region, and improves the dynamic and static performances of speed sensor-less vector control system at low-speed region.