Xiang Ji

Zhejiang University

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Co-Authors

Yanjun Li

Hangzhou City University

Wei Wei

Zhejiang University

Neng Gao

China University of Petroleum, Beijing

Yijun Su

National Institute of Biomedical Imaging and Bioengineering

Arman Goudarzi

Zhejiang University

Marc A. Suchard

University of California, Los Angeles

Baoqin Lin

First Affiliated Hospital of Guangzhou University of Chinese Medicine

Yinqiang Zheng

The University of Tokyo

Soon Ae Chun

City University of New York

James Geller

New Jersey Institute of Technology

Cooperative Institutions

Chinese Academy of Sciences

380

Zhejiang University

187

University of Chinese Academy of Sciences

173

People's Hospital of Cangzhou

121

Peking University

113

Shanghai Jiao Tong University

113

Tsinghua University

111

Sun Yat-sen University

104

Huazhong University of Science and Technology

102

University of Science and Technology of China

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An Ultra-Wideband Reflective Linear-to-Circular Polarization Converter Based on Anisotropic Metasurface

IEEE Access (2020)

Baoqin Lin Lintao Lv Jianxin Guo Zhe Liu Xiang Ji

In this work, an ultra-wideband and high-efficiency reflective linear-to-circular polarization converter based on an anisotropic metasurface is proposed, which is an orthotropic structure with a pair of mutually perpendicular symmetric axes

$u$

and

$v$

along ±45° directions with respect to the vertical

$y$

axis. The simulated and experimental results show that the polarization converter can realize ultra-wideband linear-to-circular polarization conversion at both

$x$

- and

$y$

-polarized incidences, its 3dB-axial-ratio-band is between 5.8 and 20.4 GHz, which is corresponding to a relative bandwidth of 112%; moreover, the polarization conversion efficiency (PCE) can be kept larger than 99.6% in the frequency range of 6.1–19.8GHz. In addition, to get an insight into the root cause of the LTC polarization conversion, a detailed theoretical analysis is presented, in which the conclusion is reached that in the case of neglecting thelittle dielectric loss, the axial ratio (AR) of the reflected wave can be completely determined by the phase difference between the two reflection coefficients at

$u$

- and

$v$

-polarized incidences, and any anisotropic metasurface can be used as an effective LTC polarization converter when the phase difference is close to ±90°.

Wideband

10.1109/access.2020.2988058

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Citations (78)

Energy-Saving Renovation Design of Existing Domestic Buildings in Xuzhou

Journal of Xuzhou Institute of Architectural Technology (2008)

Xiang Ji

High energy consumption is widespread in the existing domestic buildings in Xuzhou.Based on analyses of the clmate characteristics and the thermal performance of external maintenance structures of existing buildings in the area,this paper presents some techmical measures of energysaving renovation for the existing domestic buildings,from such aspects as the wall,roof,window,heating system as well as the application of regenerative energy in construction.

Xuzhou

Source

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Citations (1)

Secure computation efficiency resource allocation for massive MIMO-enabled mobile edge computing networks

China Communications (2024)

Gangcan Sun Jiwei Sun Wanming Hao Zhengyu Zhu Xiang Ji

Mobile Edge Computing

10.23919/jcc.ea.2021-0737.202401

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Motion Blur Decomposition with Cross-shutter Guidance

arXiv (Cornell University) (2024)

Xiang Ji Haiyang Jiang Yinqiang Zheng

Motion blur is a frequently observed image artifact, especially under insufficient illumination where exposure time has to be prolonged so as to collect more photons for a bright enough image. Rather than simply removing such blurring effects, recent researches have aimed at decomposing a blurry image into multiple sharp images with spatial and temporal coherence. Since motion blur decomposition itself is highly ambiguous, priors from neighbouring frames or human annotation are usually needed for motion disambiguation. In this paper, inspired by the complementary exposure characteristics of a global shutter (GS) camera and a rolling shutter (RS) camera, we propose to utilize the ordered scanline-wise delay in a rolling shutter image to robustify motion decomposition of a single blurry image. To evaluate this novel dual imaging setting, we construct a triaxial system to collect realistic data, as well as a deep network architecture that explicitly addresses temporal and contextual information through reciprocal branches for cross-shutter motion blur decomposition. Experiment results have verified the effectiveness of our proposed algorithm, as well as the validity of our dual imaging setting.

Motion blur

10.48550/arxiv.2404.01120

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Comparative Analysis of Fingerprint Orientation Field Algorithms

Dahai Chen Xiang Ji Fan Feng Jun Zhang Lei Guo

Fingerprint images are textural images consisting of ridges and valleys. The orientation of textures can be determined by orientation field computation. Fingerprint orientation field is the critical basis for fingerprint image segmentation, filtering enhancement and matching processes, and the fingerprint orientation field algorithm plays a very important role in the applied Automated Fingerprint Identification Systems (AFIS). The available fingerprint orientation field algorithms include mainly the mask algorithm and the gradient algorithm. They are used in spatial and frequency domains, respectively, and both can offer satisfactory fingerprint orientation matrixes. Based on an experimental comparison of their effectiveness in fingerprint preprocessing, this paper analyzes in detail the performance of these two algorithms.

Identification

10.1109/icig.2009.95

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Citations (8)

New species of Phrynocephalus (Squamata, Agamidae) from Qinghai, Northwest China

Zenodo (CERN European Organization for Nuclear Research) (2009)

Xiang Ji Yuezhao Wang Zheng Wang

Agamidae

10.5281/zenodo.185512

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Citations (1)

Table of contents

Nie Yong-dan Yan Zhang Tang Guowei Hou Junlong Shuang Wu

Table (database)

10.1109/iccsnt.2012.6526370

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Citations (0)

An improved condition for master–slave synchronization of Lur'e systems with time delay

Physics Letters A (2006)

Xiang Ji Yanjun Li Wei Wei

10.1016/j.physleta.2006.06.068

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Citations (57)

Intention Understanding Model Inspired by CBC Loops

Jiahui Shen Xiang Ji Daren Zha Tianshu Fu Dingyang Duan

Accurate intention understanding of the user inputs is the key to human-computer interaction (HCI). At present, more and more studies just focus on the improvement of algorithm efficiency and ignore the nature exploration of intention understanding. In humans, working memory is regarded as a cognitive system for handling a range of neuro-cognitive tasks. Because the intention understanding is a kind of human cognitive ability, in this paper we will explore the human cognitive execution mechanism and try to apply it to improve the machines' intention understanding level. First, we demonstrated a cognitive learning model called Cortico-Basal ganglia-Cerebella (CBC) loops plays an important role in the process of working memory. Then, based on the full understanding of the loops operation mechanism, we put forward a new model of intension understanding. Finally, we applied this model on speech data and compared it with other two methods. The results showed that the new model could help to get task-specific vectors and offer further gains in performance on intention understanding.

Intension

10.1109/cscwd.2019.8791921

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Citations (1)

Freshness-Aware Age Optimization for Multipath TCP Over Software Defined Networks

IEEE Transactions on Network Science and Engineering (2021)

Kai Gao Changqiao Xu Xiang Ji Jiuren Qin Shujie Yang

Recently increasing real-time network applications have raised a new requirement for the future 6G network transmission, which desires the information-update packets arrive at the receiver as timely as possible. Multipath TCP (MPTCP) can be employed in the real-time update transmission system by making use of multiple paths so as to promote the information status update. However, current optimization solutions of MPTCP focus on traditional transmission performance such as throughput, delay, loss, jitter, etc. None of these works considers the freshness metric for MPTCP to satisfy the real-time demands. What's more, most works about transmission model in Software Defined Network (SDN) are based on packet-level analysis without considering flow-level situation. In order to fill these gaps, this paper proposes a novel freshness-aware age optimization solution for MPTCP (FAMT) over SDN. FAMT introduces a new four-tuples to describe the transmission state in the SDN architecture. Then FAMT classifies the whole transmission process into two phases: connection establish phase and data transmission phase. Based on the two phases, FAMT evaluates and defines the age of information for different situations. In addition, FAMT designs an innovative age-assisted fluid model of MPTCP which can realize the four goals effectively.

Multipath TCP

10.1109/tnse.2021.3075704

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Citations (8)