Longfei Zhang

Prof. Dr. Longfei Zhang

Key Laboratory of Digital Performance and Simulation Technology, Beijing Institute of Technology, Beijing 100081, China

Research Focus & Metrics

Academic Career Length

20Years (2007-Present)

(Calculated once Scilit publication data is synced: current year − year of first publication + 1)

Representative Publications

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29 February 2024 in Electronics
Verified
Journal Article
Open access
PDF file
DYDapeng Yan
Dapeng Yan
GDGangyi Ding
Gangyi Ding
KHKexiang Huang
Kexiang Huang
CBChongzhi Bai
Chongzhi Bai
LHLian He
Lian He
LZLongfei Zhang
Longfei Zhang
The traditional social force model (SFM) in crowd simulation experiences difficulty coping with the complexity of the crowd, limited by singular physical formulas and parameters. Recent attempts to combine deep learning with these models focus more on simulating specific states of crowds. This paper introduces an advanced deep social force model, influenced by crowd states. It utilizes deep neural networks to accurately fit crowd trajectory features, enhancing behavior simulation capabilities. Geometrical constraints within the model provide control over varied crowd behaviors, adjustable to simulate different crowd types. Before training, we use the SFM to refine behaviors in real trajectories with excessively small distances, aiming to enhance the general applicability of the model. Comparative experiments affirm the effectiveness of the model, showing comparable performance to both classic physical models and modern learning-based hybrid models in pedestrian simulations, with reduced collisions. In addition, the model has a certain ability to simulate crowds with high density and diverse behaviors.

19 May 2023 in Wireless Communications and Mobile Computing
Verified
Journal Article
Open access
PDF file
YWYufeng Wu
Yufeng Wu
YHYanjun He
Yanjun He
NLNing Li
Ning Li
GWGuowei Wang
Guowei Wang
LZLongfei Zhang
Longfei Zhang
Yifan ZhuYifan Zhu
Yifan Zhu
This paper reviews the application of intelligent vision enhancement technology in the battlefield environment and explores new research directions. This paper mainly introduces three parts. First, we introduce a solution for enhancing the battlefield situation and using head-mounted displays for soldier combat. Second, we summarize three core technologies supporting intelligent vision enhancement technology: 3D environment reconstruction, tracking and registration, and situational awareness. Third, we summarize three application directions of intelligent vision enhancement technology on the battlefield. Finally, the problems and challenges in the research work are proposed, including current issues such as accurate battlefield situational awareness by augmented reality technology, multiperson collaborative management and data flow, as well as challenges in future battlefield situation enhancement and perception. The future development trend of intelligent vision enhancement technology on the battlefield has been prospected. Two meanings of this paper are as follows: the first is to review the research status of intelligent vision enhancement technology from the technical level and identify the key technical points that may restrict development in the future; the second is to analyze the advantages and disadvantages of intelligent vision enhancement technology from the level of battlefield application and the roles of users. In addition, this paper proposes how to take the lead and take initiative in future wars.

1 January 2021 in Wireless Communications and Mobile Computing
Verified
Journal Article
Open access
PDF file
YWYufeng Wu
Yufeng Wu
LZLongfei Zhang
Longfei Zhang
GDGangyi Ding
Gangyi Ding
DYDapeng Yan
Dapeng Yan
FZFuquan Zhang
Fuquan Zhang
The purpose of this paper is to improve the efficiency of performance creative choreography (PCC). Our research work shows that we can realize the model integration and data optimization for PCC in complex environments based on the combined architecture of sensor network (SN) and machine‐learning algorithm (MLA). In order to explain the process and content of this research better, this paper designs a specific problem description framework for PCC, which mainly includes the following content: (1) a twin sensor network (TSN) architecture based on digital twin information interaction is proposed, which defines and describes the acquisition method, classification (creative data, rehearsal data, and live data), and temporal and spatial features of performance data. (2) Proposed a mobile computing method based on director semantic annotation (DSA) as the core computing module of TSN. (3) A spatial dynamic line (SDL) model and a creative activation mechanism (CAM) based on DSA are proposed to realize fast and efficient PCC of dance with the TSN architecture. Experimental results show that the TSN architecture proposed in this article is reasonable and effective. The SDL model achieved significantly better performance with little time increase and improved the computability and aesthetics of PCC. New research ideas are proposed to solve the computational problem of PCC in complex environments.

1 December 2007
Verified
Conference Paper
Closed access
YWYong Wang
Yong Wang
MLMing Li
Ming Li
JXJingfeng Xue
Jingfeng Xue
JHJingjing Hu
Jingjing Hu
LZLongfei Zhang
Longfei Zhang
LLLejian Liao
Lejian Liao
In order to reflect the dynamic feature of situations and of peers' behavior more accurately, context information, which contains different attributes of situations, should be considered explicitly when evaluating trust. A context-aware trust establishment framework based on Bayesian networks is proposed. In our proposal, the contextual factors are inferred statistically, not assigned in ad hoc way as most existing solutions. We also propose a Bayesian trust mapping approach between related contexts to help application agents infer the trustworthiness in an unfamiliar context from the trust information in other contexts. We argue that the relevance of contexts is specific to agents and it should not be estimated independent of agents' trust or even fixed as in other frameworks. Our approach makes the relevance measurement implicit together with trust mapping through Bayesian networks. Simulation experiments show that our system can make more accurate trust inferences than ad hoc context-aware systems.

22 November 2015
Verified
Book Chapter
Closed access
PDF file
STShuo Tang
Shuo Tang
LZLongfei Zhang
Longfei Zhang
JCJiapeng Chi
Jiapeng Chi
ZWZhufan Wang
Zhufan Wang
GDGangyi Ding
Gangyi Ding

18 July 2015
Verified
Conference Paper
Open access
PDF file
YWYan Wang
Yan Wang
LZLongfei Zhang
Longfei Zhang
Speech voiceprint recognition with noise in complex real phone channel environment is still a critical challenge even the recognition method works well enough in non-noise situation. Background noise, especially dial tone of voice, which is the voice from surrounding disturbs the accuracy of recognition. One key problem of voiceprint processing is how...