Yanfeng He

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The collection vehicle routing problems with intermediate facilities (CVRP-IF) is actually belong to a well-known generalization of VRP, the Multi-Depot Vehicle Routing Problem with Inter-Depot Routes (MDVRPI), which is a combinatorial optimization problem and holds a central place in reverse logistics management, such as waste collection management. This(More)
The waste collection vehicle routing problems with time windows and intermediate facilities (WCVRPTW-IF) is actually belong to a well-known generalization of VRP, the Multi-Depot Vehicle Routing Problem with Inter-Depot Routes (MDVRPI), which is a combinatorial optimization problem and holds a central place in reverse logistics management. in order to(More)
Hardware components, especially CPU and memory, have made a lot of progress in terms of energy efficiency in the last decade. However, it is still far from the ideal energy proportional. Motivated by the recent observations that the energy efficiency of hardware components varies to a great extent depending on the workload characteristics, we propose eCope,(More)
This paper presents our work on simulation of large-scale black oil models on parallel computers. An in-house platform has been developed and a black oil simulator has been implemented based on this platform, which can handle the standard black oil model and oil-water model. Numerical methods and a new parallel preconditioner are introduced. The simulator(More)
Replanting disease is a major factor limiting the artificial cultivation of the traditional Chinese medicinal herb Salvia miltiorrhiza. At present, little information is available regarding the role of miRNAs in response to replanting disease. In this study, two small RNA libraries obtained from first-year (FPR) and second-year plant (SPR) roots were(More)
BACKGROUND A moderate-temperature, astaxanthin-overproducing mutant strain (termed MK19) of Phaffia rhodozyma was generated in our laboratory. The intracellular astaxanthin content of MK19 was 17-fold higher than that of wild-type. The TLC profile of MK19 showed a band for an unknown carotenoid pigment between those of β-carotene and astaxanthin. In the(More)
A parallel reservoir simulator has been developed, which is designed for large-scale black oil simulations. It handles three phases, including water, oil and gas, and three components, including water, oil and gas. This simulator can calculate traditional reservoir models and naturally fractured models. Various well operations are supported, such as water(More)
To reduce the route length of MSW collection without intermediate facilities, A Waste Collection Vehicle Arc Routing Problem with turn constraints (WCVARPTC) model was proposed, which considers the actual traffic regulations: some streets can be traversed in only one direction, some turns will be forbidden when the common angle is too narrow. An asymmetric(More)
This paper proposes a novel method for MIMO-SAR ground moving target imaging in HRWS Mode. In order to compensate the periodically modulated error signal in Doppler history due to the radial velocity of moving target, the compressed sensing theory is used to estimate radial velocity in undersampled signal firstly. Then, the compensation signal is formed(More)
A Waste Collection Arc Vehicle Routing Problem with turn constraints (WCAVRPTC) model is proposed to minimize the length of municipal solid waste (MSW) collection routes, which presents several characteristics derived from traffic regulations: some streets can be traversed crossed in only one direction, and some turns should be forbidden when the common(More)