Search results for: Zhifeng Qiu

Items from 1 to 17 out of 17 results

article

Fluorometric determination of sulfadiazine by using molecularly imprinted poly(methyl methacrylate) nanobeads doped with manganese(II)-doped ZnS quantum dots

Zhikun Gao, Yu Luan, Yi Lu, Zhiping Zhou, more

Microchimica Acta > 2019 > 186 > 9 > 1-8

The surface of poly(methyl methacrylate) nanospheres (PMMA-NSs) was molecularly imprinted with sulfadiazine by a surface imprinting method. Simultaneously, Mn(II)-doped ZnS quantum dots were incorporated into the imprinted PMMA-NSs. The morphology of the fluorescent nanoprobe was characterized by transmission electron microscopy which revealed good spheroidal core-shell structure and a homogeneous...

article

The effects of antiretroviral therapy initiation time on HIV reservoir size in Chinese chronically HIV infected patients: a prospective, multi-site cohort study

Ling Luo, Nidan Wang, Yongsong Yue, Yang Han, more

BMC Infectious Diseases > 2019 > 19 > 1 > 1-8

Background The effect of ART initiation time on HIV-1 DNA reservoir in chronically infected individuals is not well understood. Determining the potential influencing factors associated with a low HIV-1 DNA level in chronic infection is an important step toward drug-free control. Methods A prospective study included 444 chronically HIV-infected adults was performed. Participants were divided into...

article

A higher CD4/CD8 ratio correlates with an ultralow cell-associated HIV-1 DNA level in chronically infected patients on antiretroviral therapy: a case control study

Yongsong Yue, Nidan Wang, Yang Han, Ting Zhu, more

BMC Infectious Diseases > 2017 > 17 > 1 > 1-8

Background The HIV-1 DNA reservoir is an important marker that reflects viro-immunological status and can be affected by multiple viral or cellular factors. Determining the potential factors associated with the size of the HIV-1 DNA reservoir benefits the surveillance of disease progression and antiretroviral treatments. Methods We conducted a case control study to explore the factors that may affect...

chapter

Multi-time scale dispatching strategy for EV charging considering wind power

Yueshuang Bao, Qilong Huang, Zhifeng Qiu, Chunsheng Wang, more

2017 36th Chinese Control Conference (CCC) > 2978 - 2984

2017 36th Chinese Control Conference (CCC)

This paper investigates the double randomness matching mechanism between electric vehicle (EV) charging and wind power in a distribution network. The Markov Decision Process is employed to model the uncertainties of both EV and wind power. The optimized dispatching models and strategies for EV charging under multi-time scale are developed to achieve the objective function. The goal of this function...

article

Matching EV Charging Load With Uncertain Wind: A Simulation-Based Policy Improvement Approach

Qilong Huang, Qing-Shan Jia, Zhifeng Qiu, Xiaohong Guan, more

IEEE Transactions on Smart Grid > 2015 > 6 > 3 > 1425 - 1433

This paper studies the electric vehicle (EV) charging scheduling problem to match the stochastic wind power. Besides considering the optimality of the expected charging cost, the proposed model innovatively incorporates the matching degree between wind power and EV charging load into the objective function. Fully taking into account the uncertainty and dynamics in wind energy supply and EV charging...

article

Assessing impact of subjective demand beliefs on a dynamic duopoly electricity market game

Zhifeng Qiu, Ning Gui, Chunhua Yang, Geert Deconinck, more

International Journal of Electrical Power and Energy Systems > 2014 > 60 > Complete > 182-189

In the context of liberalized markets, market outcomes generally result from the strategic interactions of all market players. Generation company (Genco), as the distributed players, build their subjective demand evaluations (SDFs) about market for optimal bidding purpose. Due to the differences in terms of data availability and modeling techniques, subjective demand models held by various Gencos...

article

CD8+ T cell responses specific for hepatitis B virus core protein in patients with chronic hepatitis B virus infection

Wei Cao, Zhifeng Qiu, Ting Zhu, Yanling Li, more

Journal of Clinical Virology > 2014 > 61 > 1 > 40-46

Chronic hepatitis B virus (HBV) infection includes a set of heterogeneous clinical patterns, and core-protein-specific T cell response is important for virus control and disease progression, yet is not well elucidated.To analyze the phenotypic and functional profiles of HBV-core-protein-specific CD8+ T cells in different clinical patterns of chronic HBV infection.A total of 46 HBV patients were recruited...

article

Analysis of dynamic game played with inaccurate demand beliefs

Zhifeng Qiu, Ning Gui, Geert Deconinck

Applied Mathematics and Computation > 2014 > 230 > Complete > 530-541

This paper studies the impact of inaccurate demand beliefs on dynamic quantity-setting market games. The conventional assumption that players share a uniform and accurate demand model in game is relaxed by a more realistic model—players individually make their subjective demand estimation possibly with errors. A dynamic game with such subjective demand belief for two heterogeneous players is built...

article

Analysis of equilibrium-oriented bidding strategies with inaccurate electricity market models

Zhifeng Qiu, Ning Gui, Geert Deconinck

International Journal of Electrical Power and Energy Systems > 2013 > 46 > Complete > 306-314

In order to make competitive electricity markets effective, bidding generation companies (GENCOs) need to estimate market demand models according to information available to each of them. However, many stochastic factors (e.g. weather, demand side features) make it very hard for GENCOs to accurately capture the actual market demand in a model. Each GENCO might hold an estimated model deviating, from...

chapter

Smart meters from the angles of consumer protection and public service obligations

Geert Deconinck, Bram Delvaux, Klaas De Craemer, Zhifeng Qiu

2011 16th International Conference on Intelligent System Applications to Power Systems > 1 - 6

2011 16th International Conference on Intelligent System Applications to Power Systems (ISAP)

Digital meters for electricity and gas, which are connected to an information infrastructure are an important component of the smart metering and smart grid infrastructure being deployed. Besides technical and business perspectives, such infrastructure has an impact on the consumer and on authorities that have public service obligations. This paper discusses those elements, also in the context of...

chapter

Smart Meter's feedback and the potential for energy savings in household sector: A survey

Zhifeng Qiu, Geert Deconinck

2011 International Conference on Networking, Sensing and Control > 281 - 286

2011 International Conference on Networking, Sensing and Control (ICNSC 2011)

Smart meters, as a new technical innovation, are assumed to be able to bring a more sustainable future especially for the household sector. Behavioral change of customers induced by such advanced technology infrastructure is a guarantee to achieve energy savings. Energy information feedback solutions can improve such change. This paper performs a socio-technical review on the feedback system based...

chapter

An approach towards socially acceptable energy saving policies via monetary instruments on the smart meter infrastructure

G Deconinck, Hélène Joachain, F Klopfert, L Holzemer, more

Next generation infrastructure systems for eco-cities > 1 - 6

2010 Third International Conference on Next Generation Infrastructure Systems for Eco-Cities (INFRA 2010)

Energy savings are required, and behavioural change is a good guarantee for this. This paper presents an interdisciplinary four-step approach towards such energy savings. It is based on two types of monetary instruments (white certificates and complementary currencies), that make use of the smart meter infrastructure as a measurement platform for assessing the realised energy savings. A social component...

chapter

Comparison of Two Learning Algorithms in Modelling the Generator's Learning Abilities

Zhifeng Qiu, E. Peeters, G. Deconinck

2009 15th International Conference on Intelligent System Applications to Power Systems > 1 - 6

2009 15th International Conference on Intelligent System Applications to Power Systems (ISAP)

This paper discusses the generator's optimal bidding problem. Reinforcement learning is employed to model the generator's learning ability. Through the repeated learning, the generator can develop optimal bidding in the point view of long term. Simulation result shows the generator equipped with learning ability can definitely perform better than the one without learning ability. The learning ability...

chapter

A literature survey of Optimal Power Flow problems in the electricity market context

Zhifeng Qiu, G. Deconinck, R. Belmans

2009 IEEE/PES Power Systems Conference and Exposition > 1 - 6

2009 IEEE/PES Power Systems Conference and Exposition (PSCE 2009)

For decades researchers have developed various models and algorithms to look for the Optimal Power Flow (OPF) in different applications. Still research is ongoing to find OPF problems for the present day power system challenges such as a liberalized market or a large penetration of renewable energy source. Traditionally, classical mathematical optimization methods have been used to effectively solve...

article

HIV-specific CD8⁺ T cell responses to HXB2 Gag and Nef peptide pools in Chinese HIV/AIDS patients

HongWei Zhang, ZhiFeng Qiu, Yang Jiao, AiXia Wang, more

Science China Life Sciences > 2009 > 52 > 9 > 841-846

HXB2 is primarily used as a template strain in developing HIV vaccines in Europe and the US. However, it is not yet known whether the strain can induce strong HIV-specific CD8⁺ T cell responses in Chinese HIV/AIDS patients. In the present study, two groups of subjects were investigated: 9 AIDS patients and 7 long-term nonprogressors (LTNPs). HIV-specific CD8⁺ T cell responses were examined in all...

article

Reference ranges and age-related changes of peripheral blood lymphocyte subsets in Chinese healthy adults

Yang Jiao, ZhiFeng Qiu, Jing Xie, DongJing Li, more

Science China Life Sciences > 2009 > 52 > 7 > 643-650

This study was performed to build region-specific reference ranges of peripheral blood lymphocyte subsets for Chinese healthy adults from the young to the elderly and analyze the trends of changes in lymphocyte subsets for evaluating the impact of age on the values. 151 healthy adults aged 19–86 were recruited based on the SENIEUR protocol. Three sets of reference ranges were finally built applicable...

chapter

Development and Application of Intelligence Control Optimization Method for Alumina Batching Process

Weihua Gui, Zhifeng Qiu, Chunhua Yang, Yaling Wang, more

2006 6th World Congress on Intelligent Control and Automation > 1 > 4818 - 4822

Sixth World Congress on Intelligent Control and Automation

The batching process is pivotal in Alumina production. Forecasting the alumina raw meal quality accurately and optimizing ratio have great significance for improving alumina quality. This paper combined mathematical modeling, NN method, PCA, expert rule for the batching process estimation model. Ratio optimization decision model was established by using multi-level reasoning and implemented multi-object...

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