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A review on the electric vehicle routing problems: Variants and algorithms

Hu QIN , Xinxin SU, Teng REN, Zhixing LUO

Frontiers of Engineering Management 2021, Volume 8, Issue 3,   Pages 370-389 doi: 10.1007/s42524-021-0157-1

Abstract: Over the past decade, electric vehicles (EVs) have been considered in a growing number of models and methods for vehicle routing problems (VRPs). This study presents a comprehensive survey of EV routing problems and their many variants. We only consider the problems in which each vehicle may visit multiple vertices and be recharged during the trip. The related literature can be roughly divided into nine classes: Electric traveling salesman problem, green VRP, electric VRP, mixed electric VRP, electric location routing problem, hybrid electric VRP, electric dial-a-ride problem, electric two-echelon VRP, and electric pickup and delivery problem. For each of these nine classes, we focus on reviewing the settings of problem variants and the algorithms used to obtain their solutions.

Keywords： electric vehicles     routing     recharging stations     exact algorithms     metaheuristics    

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Power sources and electrical recharging strategies for implantable medical devices

WEI Xiaojuan, LIU Jing

Frontiers in Energy 2008, Volume 2, Issue 1,   Pages 1-13 doi: 10.1007/s11708-008-0016-3

Abstract: In this sense, long-term powering and recharging of an IMD via a highly safe, efficient and convenienttransmission, piezoelectric power generation, thermoelectric devices, ultrasonic power motors, radio frequency rechargingand optical recharging methods, etc., are also discussed.

Keywords： generation     bio-fuel     ultrasonic     piezoelectric     conventional    

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Impact of renewable energies on the operation and economic situation of coal fired power stations: Actualsituation of coal fired power stations in Germany

Hans-Joachim KRAUTZ, Alexander LISK, Joachim POSSELT, Christian KATZER

Frontiers in Energy 2017, Volume 11, Issue 2,   Pages 119-125 doi: 10.1007/s11708-017-0468-4

Abstract: Due to the fluctuating character of the renewable energy sources the demand of conventional power plants for flexibility is increasing. In the recent years, in Germany there has been a fast rise of production capacity of renewable energies, especially from wind turbines, photovoltaic installations, and biomass plants. The installed nominal power of wind turbines is actually (December 2016) 42 GW and of photovoltaic installations 40?GW. The renewable electric energy production in Germany is about 190?TWh/a, which represents a share of 33% of the yearly demand. The increased need for flexibility affects both the power gradients as well as the minimum load of conventional power plants. Due to this flexibility behaviour, conventional power plants are faced with problems concerning the durability of power plant components, corrosion, more maintenance effort and consequently the overall life expectancy. Another consequence of the increasing share of renewable energies is the decreasing full load operating hours, especially of coal fired and gas power plants. Along with decreasing revenues from the energy exchange market, coal fired power plants are faced with new economically challenges.

Keywords： flexible load operation     minimal load     power gradients     power plant maintenance     corrosion     life expectancy    

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Optimal precoding for full-duplex base stations under strongly correlated self-interference channels Article

Jun WANG, Xiao-jie WEN, Chuan HUANG, Chao-jin QING

Frontiers of Information Technology & Electronic Engineering 2017, Volume 18, Issue 6,   Pages 808-816 doi: 10.1631/FITEE.1700022

Abstract: We study the optimal precoding for a full-duplex (FD) system, where one FD multi-antenna base station (BS) respectively transmits to and receives from two half-duplex single-antenna mobile users (MUs) on the same time slot and frequency band. At the FD BS, the received signal from the desired MU is severely affected by the extremely strong self-interference (SI) from its transmit antennas to the receive antennas. In the presence of residual SI after imperfect SI cancellation, the downlink transmission rate maximization problem subject to a targeted uplink rate is formulated as a non-convex optimization problem to characterize the achievable rate region for the considered system. Considering the case in which the SI channel is strongly correlated, the above problem is transformed into a convex problem by exploiting the rank-one property of the SI channel, which can be solved efficiently. Finally, numerical results validate the effectiveness of the proposed scheme.

Keywords： Linear precoding     Full-duplex     Achievable rate region     Strongly correlated self-interference channel    

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Optimal locations of monitoring stations in water distribution systems under multiple demand patterns

Shuming LIU, Wenjun LIU, Jinduan CHEN, Qi WANG

Frontiers of Environmental Science & Engineering 2012, Volume 6, Issue 2,   Pages 204-212 doi: 10.1007/s11783-011-0364-9

Abstract: A flaw of demand coverage method in solving optimal monitoring stations problem under multiple demandIn the demand coverage method, the demand coverage of each set of monitoring stations is calculated byThis could lead to miscalculation of the optimal locations of the monitoring stations.Results show that the set of optimal locations of monitoring stations obtained using the DCI method can

Keywords： demand coverage     monitoring     optimization     water distribution network     water quality    

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Effect of strata restraint on seismic performance of prefabricated sidewall joints in fabricated subway stations

Frontiers of Structural and Civil Engineering 2023, Volume 17, Issue 5,   Pages 763-779 doi: 10.1007/s11709-023-0917-6

Abstract: A disadvantage of the conventional quasi-static test method is that it does not consider the soil restraint effect. A new method to test the seismic performance of prefabricated specimens for underground assembled structures is proposed, which can realistically reflect the strata restraint effect on the underground structure. Laboratory work combined with finite element (FE) analysis is performed in this study. Three full-scale sidewall specimens with different joint forms are designed and fabricated. Indices related to the seismic performance and damage modes are analyzed comprehensively to reveal the mechanism of the strata restraint effect on the prefabricated sidewall components. Test results show that the strata restraint effect effectively improves the energy dissipation capacity, load-bearing capacity, and the recoverability of the internal deformation of the precast sidewall components. However, the strata restraint effect reduces the ductility of the precast sidewall components and aggravates the shear and bending deformations in the core region of the connection joints. Additionally, the strata restraint effect significantly affects the seismic performance and damage mode of the prefabricated sidewall components. An FE model that can be used to conduct a seismic performance study of prefabricated specimens for underground assembled structures is proposed, and its feasibility is verified via comparison with test data.

Keywords： underground structures     precast sidewall specimen     seismic test method     bearing capacity     energy dissipation capacity     plastic deformation    

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Development of hydrogen transport corridor along Huaihe River ecological economic zone based on SWOT method

Zhang Liangliang,Liu Yong and Zhou Lingyun

Strategic Study of CAE 2015, Volume 17, Issue 3,   Pages 96-99

Abstract:

With the rapid growth of automobile consumption and lack of oil resources， it is an important measure to solve the problem of vehicle fuel by using hydrogen energy. In China， we have built a non-grid-connected wind power hydrogen demonstration project in Jiangsu coast. And the government has planned the transport corridor construction along thousands of miles along Huaihe River. The research shows that Huaihe river ecological economic zone development of hydrogen highway has strengths， weaknesses， opportunities and threats by SWOT method. Finally， the research puts forward some countermeasures and suggestions the on the development of hydrogen highway.

Keywords： hydrogen energy cars； transport corridor； hydrogen refueling stations； SWOT method    

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Efficiency Optimization of Variable Frequency Variable Speed Water-supply Pumping Stations Based on Genetic

Liao Li,Lin Jiaheng,Zhang Chenghui

Strategic Study of CAE 2002, Volume 4, Issue 9,   Pages 54-58

Abstract: of electric energy in the city, and the quantity it consumes mainly depends on the pumps of pumping stationsSo it is important to optimize operation of water-supply pumping stations, for safety water supply andThis paper presents an optimal scheduling model of water-supply pumping stations based on approximation

Keywords： water-supply pumping station     approximation of numerical value     optimization     genetic algorithm    

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Maximizing power saving with state transition overhead for multiple mobile subscriber stations in WiMAX Article

Bo LI,Sung-kwon PARK

Frontiers of Information Technology & Electronic Engineering 2016, Volume 17, Issue 10,   Pages 1085-1094 doi: 10.1631/FITEE.1500314

Abstract: In the IEEE 802.16e/m standard, three power saving classes (PSCs) are defined to save the energy of a mobile subscriber station (MSS). However, how to set the parameters of PSCs to maximize the power saving and guarantee the quality of service is not specified in the standard. Thus, many algorithms were proposed to set the PSCs in IEEE 802.16 networks. However, most of the proposed algorithms consider only the power saving for a single MSS. In the algorithms designed for multiple MSSs, the sleep state, which is set for activation of state transition overhead power, is not considered. The PSC setting for real-time connections in multiple MSSs with consideration of the state transition overhead is studied. The problem is non-deterministic polynomial time hard (NP-hard), and a suboptimal algorithm for the problem is proposed. Simulation results demonstrate that the energy saving of the proposed algorithm is higher than that of state-of-the-art algorithms and approaches the optimum limit.

Keywords： Power saving class     State transition overhead     IEEE 802.16e/m     Quality of service    

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prediction formula of water temperature released from the multi-level stop-log gate intake of hydropower stations

Gao Xueping,Chen Hong,Song Huifang

Strategic Study of CAE 2011, Volume 13, Issue 12,   Pages 63-67

Abstract:

In thermally stratified reservoir, a multi-level intake structure is usually adopted in hydropower station to reduce the negative effect of releasing lower-temperature water to the environment in downstream reach. And a simple and practical formula of water temperature released is need. In this paper, based on Nuozhadu Hydropower Station, a model test is conducted to model the thermal stratification of this reservoir, and measure the temperature of water released from the intake structure. A prediction formula of water temperature released is put forward based on the experimental data. The formula is validated by the experimental results of water temperature released from the intakes of Jinping No.1 Hydropower Station.

Keywords： thermally stratified reservoir     hydropower station intake     stop-log gate     formula of water temperature released     model experiment    

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Title Author Date Type Operation

A review on the electric vehicle routing problems: Variants and algorithms

Hu QIN , Xinxin SU, Teng REN, Zhixing LUO

Journal Article

Power sources and electrical recharging strategies for implantable medical devices

WEI Xiaojuan, LIU Jing

Journal Article

Impact of renewable energies on the operation and economic situation of coal fired power stations: Actualsituation of coal fired power stations in Germany

Hans-Joachim KRAUTZ, Alexander LISK, Joachim POSSELT, Christian KATZER

Journal Article

Optimal precoding for full-duplex base stations under strongly correlated self-interference channels

Jun WANG, Xiao-jie WEN, Chuan HUANG, Chao-jin QING

Journal Article

Optimal locations of monitoring stations in water distribution systems under multiple demand patterns

Shuming LIU, Wenjun LIU, Jinduan CHEN, Qi WANG

Journal Article

Effect of strata restraint on seismic performance of prefabricated sidewall joints in fabricated subway stations

Journal Article

Development of hydrogen transport corridor along Huaihe River ecological economic zone based on SWOT method

Zhang Liangliang,Liu Yong and Zhou Lingyun

Journal Article

Efficiency Optimization of Variable Frequency Variable Speed Water-supply Pumping Stations Based on Genetic

Liao Li,Lin Jiaheng,Zhang Chenghui

Journal Article

Maximizing power saving with state transition overhead for multiple mobile subscriber stations in WiMAX

Bo LI,Sung-kwon PARK

Journal Article

prediction formula of water temperature released from the multi-level stop-log gate intake of hydropower stations

Gao Xueping,Chen Hong,Song Huifang

Journal Article