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To avoid large overvoltage when the current of the dc-link inductor is interrupted, overlap time is added to the drive signals in current source converters, which results in the extra harmonic in grid current. Waveforms of AC side current before and after added overlap time are achieved from analysis of the current commutation process. The expression of overlap current is given according to the pulse...
Scientific simulations on high performance computing (HPC) platforms generate large quantities of data. To bridge the widening gap between compute and I/O, and enable data to be more efficiently stored and analyzed, simulation outputs need to be refactored, reduced, and appropriately mapped to storage tiers. However, a systematic solution to support these steps has been lacking on the current HPC...
Die-stacked DRAM (a.k.a., on-chip DRAM) provides much higher bandwidth and lower latency than off-chip DRAM. It is a promising technology to break the "memory wall". Die-stacked DRAM can be used either as a cache (i.e., DRAM cache) or as a part of memory (PoM). A DRAM cache design would suffer from more page faults than a PoM design as the DRAM cache cannot contribute towards capacity of...
This paper investigates the problem of cooperative formation control of unmanned surface vehicles (USVs). According to the second-order consensus protocol with a virtual-leader, a distributed control law is derived, in which the consensus formation motion information can only be obtained by a part of USVs. Taking advantages of the shared information between adjacent multi-USVs, the USVs can control...
With the development of science and technology, the process of urbanization has also been accelerated; the problem of road safety has been becoming more and more serious, which made it imperative to solve the problem of road transportation. This paper discusses the related influencing factors of road transportation network vulnerability, analyzes the relationship between various factors, and establishes...
The Cumulus Pricing Scheme (CPS) could be an important management functionality of the commercial networks in future and it is the only approach known so far defining a clear relation between different time-scales of accounting periods, measurement periods and charging periods. Prices in this scheme are based on flat fees and hence predictable and transparent. CPS is backed by the design of a generic...
Operating room (OR) plays a key role in hospitals. Resources required for surgery process include both manpower and facilities. A rational utilization of resource may lead to high efficiency of OR, as well as patients satisfaction. A discrete event system simulation model of ORs in hospital is built under SIMIO. The case study is investigated based on current patients flow and operation data collected...
Considering the shortcomings of the attribute weight setting method used currently in the decision model of choosing project transaction mode, which is typically characterized by precise weights, the stochastic problem of index weight of multi-attribute comprehensive evaluation is researched. Under the weight interval information is chosen, the stochastic weight assignment method is used to determine...
It is paid more attention to seismic collapse of high-rise RC frame structures in recent years. In this paper, seismic collapse process of a ten-storey RC frame structures from elastic stage to crack, then to collapse is simulated and analyzed using the finite element software named ANSYS/LS-DYNA. The simulation result is in good accordance with the actual seismic collapse process. It proves that...
Peta-scale scientific applications running on High End Computing (HEC) platforms can generate large volumes of data. For high performance storage and in order to be useful to science end users, such data must be organized in its layout, indexed, sorted, and otherwise manipulated for subsequent data presentation, visualization, and detailed analysis. In addition, scientists desire to gain insights...
The modeling methods available can not describe impacts of adjustment ability of logistics system on payoff and cost of logistics system. In view of such a fact, theorem of adjustment ability of logistics system in supply chain circumstance on condition that payoff of supply chain is a unique increasing process was proposed. A sequence of MGF (moment generating function) of out-of-goods risk process...
The modeling methods available can not describe impacts of adjustment ability of logistics system on payoff and cost of logistics system. In view of such a fact, theorem of adjustment ability of logistics system in supply chain circumstance on condition that payoff of supply chain is a unique increasing process was proposed. A sequence of MGF (moment generating function) of out-of-goods risk process...
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