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To improve the local accessibility performance, some important services are usually replicated and maintained in multiple datacenters. A user can request any datacenter which hosts the required service. The traditional end-to-end path is gradually replaced by the end-to-service path. To resist the frequently occurred natural disasters or human-made faults, survivability technologies need to be deployed...
We study the problem of joint spectrum and storage resource backup (JSSRB) to improve the survivability of elastic optical datacenter networks (EODNs) for cloud services. An ILP model and heuristic algorithms are developed. Simulation results show that JSSRB can effectively improve the survivability and spectrum efficiency of EODNs.
The aim of this paper is to develop an integral equation based spectral method for prediction of chatter stability in low radial immersion milling. First, the delay-differential equation with time-periodic coefficients governing the dynamic milling process is transformed into the integral equation. Then, the duration of one tooth period is divided into the free vibration and the forced vibration processes...
The failure of energy recovery with descending of regular hydraulic excavator's boom causes heat release problem, disfunction, and accelerated wear. According to this issue, this paper proposes a hydraulic excavator boom potential recovery system based on accumulator-hydraulic motor-generator. The accumulator of the system stores potential energy from construction of boom hydraulic cylinder through...
A semi-active control heave compensation system is proposed, according to the requirements of 6000m deep sea poly-metallic mining system. The heave compensation system is acted upon by interacting of dynamic vibration absorber with accumulator. Magneto-rheological damper is act upon actuator to take semi-active control of heave compensation system. The composition and principle of the heave compensation...
This paper discusses the optimum order quantity of the EOQ model that is not only dependent on the inventory policy but also on firm' credit policy. To reduce default risks, in practice, a supplier frequently offers a partial down-stream trade credit to its customers who must pay a portion of the purchase amount at the time of placing an order as a collateral deposit, and then receive a permissible...
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