Lie compensator design for exact linearization of inverter-fed induction machines

Differential-geometry methods enable the design of a Lie compensator that exactly linearizes the total system including the nonlinearities of an induction motor. The aim of this work is to prove under which circumstances the five equations of the induction motor are exactly linearizable and to figure out the linearization unit details as a basis for a linear controller. The use of computer-algebraic procedures facilitates the evaluation of the complex calculations. Simulations and the comparison with measurements of practical plants show that the linearization is successful and that the over-all system including induction motor, linearization circuit and controller obeys optimal tracking performance.     

HAG：An Energy-Proportional Data Storage Scheme for Disk Array Systems

Energy consumption has been a critical issue for data storage systems, especially for modern data centers. A recent survey has showed that power costs amount to about 50%of the total cost of ownership ...     

A Heuristic for Multiple Lot Sizing For an Order Under Variable Yield

Consider a job shop which must completely fill a large make-to-order demand of a product where production yield is highly variable. After a production lot is completed, if the total output of satisfactory units is inadequate to satisfy the demand, then a new run (with associated setup cost) is made. When the output of good units exceeds the demand, then the excess units are scrapped (with possible salvage value). The optimal lot size minimizes the total of production, setup, holding, shortage, and scrap costs. A heuristic is developed based on the incremental cost of increasing the lot size by one unit. The computational ease and excellent cost performance of the heuristic favor its use in place of the mathematically optimal solution obtained by dynamic programming. Real world manufacturing applications and additional properties of the model are also discussed.     

An approach to the hardware implementation of wave digital filters

An approach to implement wave digital filter is presented. The implementation method is applicable to wave digital filters containing only 3-ports adaptors, connected with reflection-free ports. All arithmetic operations are performed in a special arithmetic unit. Main features are the fact that the arithmetic units are effectively utilized, and that only a few memories of standard type are needed.     

Field Experiments With a Grooming Switch for OTDM Meshed Networking

Field experiments of 42.7/128.1 Gb/s wavelength-division multiplexed, optical time-division multiplexed (WDM-OTDM) transmultiplexing and all-optical dual-wavelength regeneration at the OTDM rate are presented in this paper. By using the asynchronous retiming scheme, we achieve error-free bufferless data grooming with time-slot interchange capability for OTDM meshed networking. We demonstrate excellent performance from the system, discuss scalability, applicability, and the potential reach of the asynchronous retiming scheme for transparent OTDM-domain interconnection.      

用于锁模光纤激光陀螺的相敏检测

通过采用锁相放大器,演示了一种性能明显提高的锁模光纤激光陀螺.结果表明锁相放大器的输出与转动速率之间具有理想的线性关系,并对两脉冲(在时间间隔测量过程中引起相位误差)之间的光强差不敏感.与以往报道的时间间隔测量相比,演示了长期稳定性提高了二个数量级.