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Freight flow management in rail systems involves multicommodity flows on a network complicated by node activities (queueing and classification of cars at marshalling yards). Routing in these systems should account for technology requirements of motive power and traction as well as resource allocation (cars to blocks, blocks to trains). In this paper, we propose a hierarchial taxonomy of modelling issues and describe a class of models dealing with car routing and train makeup from the viewpoint of network flows and combinatorial optimization. We compare our model with two previous rail network models and discuss possibilities for algorithmic development.
A charge injection device has been realized in which charge can be injected on to an MOS-capacitor from a buried layer via an isolated transfer layer. The Asian Fit Oakley Gray Lens Black Frame cell is positioned vertically between word and bit line. LOCOS (local oxidation) is used to isolate the cells and (deep) ion implantation to realize the buried bit line and transfer layer. This isolation prevents carriers from diffusing to neighbouring cells and Sunglasses Oakley C Six Black Frame Light Blue Lens hence preserves stored information. The device physics has been analysed using simulation programs and bipolar modelling. It is shown that this device can be used as a dynamic RAM-cell of extreme simplicity and potentially small cell size compared to conventional DRAM cells.