Chao Cai

Huazhong University of Science and Technology

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Jun Luo

State Key Laboratory of Vehicle NVH and Safety Technology

Menglan Hu

Huazhong University of Science and Technology

Zhe Chen

Fudan University

Henglin Pu

Purdue University West Lafayette

Rong Zheng

Lanzhou Jiaotong University

Tianyue Zheng

Tsinghua University

Xiaoqiang Ma

Douglas College

Jiangchuan Liu

Simon Fraser University

Yang Zhang

Nanjing University of Aeronautics and Astronautics

Kai Peng

Huazhong University of Science and Technology

Cooperative Institutions

Feminist Archive North

204

Pacific Environment

128

Xenon Pharmaceuticals (Canada)

127

University of Zurich

Huazhong University of Science and Technology

Istituto Nazionale di Fisica Nucleare, Sezione di Napoli

Chinese Academy of Sciences

University of Chinese Academy of Sciences

Tsinghua University

Peking University

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A University Teachers’ Teaching Performance Evaluation Method Based on Type-II Fuzzy Sets

Mathematics (2021)

Xixia Sun Chao Cai Su Pan Nan Bao Ning Liu

This paper proposes a university teachers’ teaching performance evaluation method based on type-II fuzzy sets (T2 FSs), which solves the problems of fuzziness, complexity and uncertainty in teaching performance evaluation. Firstly, the evaluation indicator system is constructed from the aspects of teaching attitude, teaching contents, teaching professionalism, teaching methods and teaching effects. Then, T2 FSs theory and the perceptual computing method are introduced to model subjective judgments and capture uncertainties, effectively handling higher levels of uncertainty in the evaluation process. Furthermore, the linguistic weighted average operator is applied as the computing with words engine to aggregate scores and weights of indicators, which effectively integrates the uncertain information in the input data into the final evaluation conclusion and guarantees the accuracy of the evaluation results. Finally, the effectiveness of the method of this study is evaluated by simulation experiments. The computational results demonstrate that it can capture more uncertain and complex information, and is more accurate and reliable than the type-I fuzzy sets method.

Operator (biology)

10.3390/math9172126

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Citations (10)

Network Performance Test and Analysis of LTE-V2X in Industrial Park Scenario

Wireless Communications and Mobile Computing (2020)

Yuanyuan Fan Liu Liu Shuoshuo Dong Lingfan Zhuang Jiahui Qiu

As one of the mainstream technologies of vehicle-to-everything (V2X) communication, Cellular-V2X (C-V2X) provides high reliability and low latency V2X communications. And with the development of mobile cellular systems, C-V2X is evolving from long-term evolution-V2X (LTE-V2X) to new radio-V2X (NR-V2X). However, C-V2X test specification has not been completely set in the industry. In order to promote the formulation of relevant standards and accelerate the implementation of industrialization, the field test and analysis based on LTE-V2X in the industrial park scenario is conducted in this paper. Firstly, key technologies of LTE-V2X are introduced. Then, the specific methods and contents of this test are proposed, which consists of functional and network performance tests to comprehensively evaluate the communication property of LTE-V2X. Static and dynamic tests are required in both line-of-sight (LOS) and non-line-of-sight (NLOS) scenarios to evaluate network performance. Next, the test results verify that all functions are normal, and the performance evaluation indexes are appraised and analyzed. Finally, it summarizes the whole paper and puts forward the future work.

Non-line-of-sight propagation

Port (circuit theory)

10.1155/2020/8849610

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Citations (14)

Wider is Better? Contact-free Vibration Sensing via Different COTS-RF Technologies

IEEE INFOCOM 2022 - IEEE Conference on Computer Communications (2023)

Zhe Chen Tianyue Zheng Chao Cai Yue Gao Pengfei Hu

10.1109/infocom53939.2023.10229035

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Citations (2)

[A 3D real-time visualization system of medical image].

PubMed (2002)

Jiquan Liu Jingyi Feng Chao Cai Huilong Duan

Source

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Citations (1)

MIPPR 2011: Multispectral Image Acquisition, Processing, and Analysis

SPIE eBooks (2011)

Zhiguo Cao Aaron Fenster László G. Nyúl Chao Cai

Source

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Citations (4)

Optimal configuration of energy storage for high penetration of flexible resource aggregation in new-type source-load distribution networks

Chao Cai Jun Han Wenjie Pan Anjie Fan Haofei Chen

Penetration (warfare)

10.1109/sges63808.2024.10824117

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Citations (0)

Design and performance of the field cage for the XENONnT experiment

arXiv (Cornell University) (2023)

E. Aprile K. Abe S. Ahmed Maouloud L. Althueser Bernard Andrieu

The precision in reconstructing events detected in a dual-phase time projection chamber depends on an homogeneous and well understood electric field within the liquid target. In the XENONnT TPC the field homogeneity is achieved through a double-array field cage, consisting of two nested arrays of field shaping rings connected by an easily accessible resistor chain. Rather than being connected to the gate electrode, the topmost field shaping ring is independently biased, adding a degree of freedom to tune the electric field during operation. Two-dimensional finite element simulations were used to optimize the field cage, as well as its operation. Simulation results were compared to ${}^{83m}\mathrm{Kr}$ calibration data. This comparison indicates an accumulation of charge on the panels of the TPC which is constant over time, as no evolution of the reconstructed position distribution of events is observed. The simulated electric field was then used to correct the charge signal for the field dependence of the charge yield. This correction resolves the inconsistent measurement of the drift electron lifetime when using different calibrations sources and different field cage tuning voltages.

10.48550/arxiv.2309.11996

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Citations (0)

Mobility-Pattern-Based Anomaly Detection Algorithm in Mobile Networks

IEEE International Conference on Communications (2008)

Chao Cai Ajay Gupta

Numerous approaches have been proposed for intrusion detection in immobile networks. However, little research work has been done in actually implementing them, especially for anomaly detection, in mobile networks. In this paper, we present an efficient mobility-pattern-based (MPB) anomaly detection algorithm. It can effectively identify abnormal mobility patterns of the nodes in mobile networks. In the proposed algorithm, the normal mobility profile of a specific node is characterized by a multi-leaf tree structure in which each node corresponds to a possible destination cluster. A normal mobility profile is generated during the training process through data mining and fuzzy logic techniques. More specifically, data mining techniques are used for cluster classifications, and fuzzy logic techniques are used to integrate the 'similar'' pattern strings after the corresponding cluster generation. These two techniques are also used during the testing process for distinguishing abnormal mobility patterns of the node from those of the normal in mobile networks. Simulation results demonstrate that our proposed MPB anomaly detection algorithm can achieve good performance in terms of detection rate and false alarm rate for nodes with regular movement behaviors by fine tuning the design parameter - threshold, that can be chosen efficiently.

Anomaly (physics)

False positive rate

Mobility model

10.1109/icc.2008.324

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Citations (4)

Accurate Ranging on Acoustic-Enabled IoT Devices

IEEE Internet of Things Journal (2018)

Chao Cai Menglan Hu Xiaoqiang Ma Kai Peng Jiangchuan Liu

The enabling Internet-of-Things technology has inspired many innovative sensing mechanisms by repurposing the onboard sensors. Leveraging the built-in acoustic sensors for ranging is among one of the interesting applications. However, among the few studies on acoustic ranging, the one-way sensing method suffers from synchronization errors and requires cumbersome kernel modifications; the other two-way approaches overcome these shortcomings, but they are sensitive to system delays. In this case, this paper proposes a novel lightweight one-way sensing paradigm without the above drawbacks. The key insight of this paper is to perform ranging by estimating the propagation time of acoustic signals via linear frequency modulation signal mixing. Such a signal mix operation can translate range estimation into fine-grain frequency estimation, thereby enhancing ranging accuracy. In addition, our system can have multiple receivers co-exist and thus the measurement dimensions are boosted. We have implemented and evaluated our system prototype in real-world settings. The prototype demonstrated centimeter-level ranging performance.

Ranging

SIGNAL (programming language)

10.1109/jiot.2018.2879371

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Citations (15)

3D ultrasound image guidance system used in RF uterine adenoma and uterine bleeding ablation system

Proceedings of SPIE, the International Society for Optical Engineering/Proceedings of SPIE (2006)

Mingyue Ding Xiaoan Luo Chao Cai Chengping Zhou Aaron Fenster

Uterine adenoma and uterine bleeding are the two most prevalent diseases in Chinese women. Many women lose their fertility from these diseases. Currently, a minimally invasive ablation system using an RF button electrode is being used in Chinese hospitals to destroy tumor cells or stop bleeding. In this paper, we report on a 3D US guidance system developed to avoid accidents or death of the patient by inaccurate localization of the tumor position during treatment. A 3D US imaging system using a rotational scanning approach of an abdominal probe was built. In order to reduce the distortion produced when the rotational axis is not collinear with the central beam of the probe, a new 3D reconstruction algorithm is used. Then, a fast 3D needle segmentation algorithm is used to find the electrode. Finally, the tip of electrode is determined along the segmented 3D needle and the whole electrode is displayed. Experiments with a water phantom demonstrated the feasibility of our approach.

3D ultrasound

Distortion (music)

Rf ablation

10.1117/12.652639

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Citations (2)