Shiqi Wu

University of Electronic Science and Technology of China

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Lidong Zhu

University of Electronic Science and Technology of China

Hui Xu

Peking University

Tingyong Wu

University of Electronic Science and Technology of China

Dingyong Gou

University of Electronic Science and Technology of China

Fangfang Chen

Jilin University

Meixi Li

Hebei General Hospital

Yongning Zhuo

University of Electronic Science and Technology of China

Liu Gang

Hefei University

Lemin Li

University of British Columbia

Fei Huang

Alibaba Group (United States)

Cooperative Institutions

University of Electronic Science and Technology of China

Chinese Academy of Sciences

Chongqing Medical University

Hefei University of Technology

Southwest University

Nanjing University of Information Science and Technology

Peking University

Tsinghua University

Xi'an Jiaotong University

University of Chinese Academy of Sciences

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Convergent-reconstruction-based Inter-Layer Inter-Satellite Links Establishment Strategies for Two-tier LEO/MEO Satellite Networks

International Workshop on Satellite and Space Communications (2006)

Tingyong Wu Jianhao Hu Shiqi Wu

In two-tier LEO/MEO satellite networks, reconstruction of any inter-layer inter-satellite links (ILISLs) may cause the reconfiguration of the whole network topology. Hence, the time variability of the two-tier satellite network topology will be aggravated. In this paper, two novel convergent-reconstruction-based ILISL establishment strategies are proposed. The proposed strategies can reduce the number of network topology reconfigurations and improve the topological stability of the LEO/MEO two-tier satellite networks by forcing all ILISLs to reconstruct at the same time instant. Simulation results prove the validity of the proposed strategies and show that the topological stability of the two-tier LEO/MEO satellite networks can be improved with acceptable cost

Control reconfiguration

Forcing (mathematics)

Communications satellite

10.1109/iwssc.2006.256038

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Citations (2)

A generalized model for mobile satellite channels and performance analysis

Xing Li Shiqi Wu

The generalized model for mobile satellite channels includes main classical narrowband models and suits well with the features of UHF/L/Ka. The paper provides statistical description of the model, and analyses in detail kinds of parameters related with channel model such as level cross rate (LCR), average fade duration (AFD), bit error rate (BER), block error rate. Finally, the paper describes the procedure to extract model parameters from experimental data.

Narrowband

Block Error Rate

Word error rate

Fade

Communications satellite

10.1109/icct.2003.1209715

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Citations (1)

Call Admission Performance Analysis of LEO Satellite Communication Systems

Telecommunication Engineering (2006)

Shiqi Wu

On the basis of the uniform traffic pattern,a simple and effective call admission control(CAC) algorithm is introduced according to the characteristic of low earth orbit(LEO) communication systems,which can handle nonuniform traffic distribution over the coverage area.Meanwhile,the new call blocking probability and the handover call dropping probability of the system can reach a better balance.Based on the random access scheme and guard channel(GC) scheme,computer simulation is performed and the corresponding results are presented.

Call blocking

Call Admission Control

Guard (computer science)

Blocking (statistics)

Communications satellite

Random access

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Inhibition of β2-adrenergic receptor regulates necroptosis in prostate cancer cell

Heliyon (2024)

Shiqi Wu Meixi Li Fangfang Chen Yan Zeng Xu Chen

As the malignant tumor with the highest incidence in male, prostate cancer poses a significant threat to the reproductive health of elderly men. Our previous studies have shown that promoting necroptosis of cancer cells can effectively inhibit cancer cell proliferation. This study includes lentivirus-mediated knockdown of β2AR which resulted in stable transfectants that exhibited an increased ability to form clones compared to that of the negative control group. In the protein and mRNA levels, necroptosis associated RIP and mixed lineage kinase domain-like (MLKL) were significantly higher in the treatment group than they were in the control group. Furthermore, cells treated with propranolol exhibited necrotic morphology as observed by transmission electron microscopy. The combination of β2AR suppression and necroptosis inhibitors resulted in a more potent suppression of cell proliferation compared to that observed in the control and negative control groups. Additionally, it elevated in the necrosis rate as determined by flow cytometry. Immunofluorescence staining revealed enhanced RIP and MLKL expression in the sh-β2AR group compared to levels in the negative control group. Co-immunoprecipitation experiments detected an interaction between β2AR and RIP. MLKL and RIPK3 levels were significantly higher in xenograft tumor sections from the sh-β2AR group compared to levels in the sh-NC group. To conclude, our research indicates the proliferation of PC-3 and DU-145 cprostate cancer cells can be suppressed by inhibiting β2AR, and this occurs through the RIP/MLKL-mediated pathway of necroptosis.

10.1016/j.heliyon.2024.e31865

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Dynamic slot allocation multiple access protocol for wireless ATM networks

Xiaowen Wu Shiqi Wu Sun Hairong Lemin Li

In this paper, a novel multiple access scheme named DSAMA protocol is proposed for wireless ATM networks. DSAMA is the combination of reservation multiple access protocol and dynamic slot allocation algorithm. The orthogonal code is used for reservation in the DSAMA system. Hence, the packet collisions are prevented while several packets apply for reservation slot simultaneously. In addition, due to bandwidth limitation, the dynamic slot allocation algorithm with bound variable for bursty traffic is also proposed in this paper, so that the QoS of multimedia traffic is guaranteed in wireless ATM networks. A computer simulation is utilized to validate the DSAMA protocol. From the analysis and simulation results, we know that the slot utilization in the DSAMA system is higher than that of the other well-known integrated services multiple access (e.g., PRMA, PRMA++). Furthermore, the performance of bursty traffic in the DSAMA system outperforms the case without dynamic slot allocation. We are sure that DSAMA protocol is a competitive candidate to be adopted in the wireless ATM networks.

Channel access method

Bandwidth allocation

10.1109/icc.1997.595050

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Citations (29)

Factors affect WLAN system throughput

Radio and communications technology (2006)

Shiqi Wu

Source

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Citations (0)

Call admission control in multiservices CDMA systems

Lidong Zhu Xiang Ling Shiqi Wu

Adaptive interference threshold-based call admission control in multiservice CDMA systems is proposed. Different interference thresholds are set up for new calls and handoff calls. The interference threshold for handoff calls is higher than that for new calls. When a new or handoff call arrives, intra-cell and inter-cell interference are first calculated, and then the total interference is obtained. Total interference is compared with the interference threshold. If the total interference is less than the threshold, the call is accepted, otherwise it is rejected. Numerical results indicate that adaptive threshold-based CAC (ATB CAC) is better than fixed CAC with lower handoff call blocking probability and lower GOS (grade of service).

Call Admission Control

Call blocking

Co-channel interference

10.1109/icccas.2002.1180598

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Citations (6)

Design of Wave Glider Optimal Parameters Suitable for the Northwest Pacific Ocean, the North Indian Ocean, and the South China Sea

Journal of Marine Science and Engineering (2021)

Xi Chen Mei Hong Shiqi Wu Kefeng Liu Kefeng Mao

To study the optimal design of Wave Glider parameters in the wave environment of the Northwest Pacific Ocean, the North Indian Ocean, and the South China Sea, the average velocity of a Wave Glider was taken as the evaluation criterion. Wave reanalysis data from ERA5 were used to classify the mean wave height and period into five types by the K-means clustering method. In addition, a dynamic model was used to simulate the influence of umbilical length, airfoil, and maximum limited angle on the velocity of the Wave Glider under the five types of wave element. The force of the wings was simulated using FLUENT as the model input. The simulation results show that (1) 7 m is the most suitable umbilical length; (2) a smaller relative thickness should be selected in perfect conditions; and (3) for the first type of wave element, 15° is the best choice for the maximum limited angle, and 20° is preferred for the second, third, and fourth types, while 25° is preferred for the fifth type.

Significant wave height

Wave height

10.3390/jmse9040408

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Citations (2)

Location Update Strategy Based on Timer and Movement for LEO Satellite Networks

Telecommunication Engineering (2008)

Shiqi Wu

LEO(Low Earth Orbit) satellite is moving fast and the location information of MT(mobile terminal) is changing all the way,so managing the location information of MT effectively and minimizing location update frequency and paging cost are the main purposes.So,a location update strategy based on time and movement is proposed.Location update frequency is decreased without increasing the paging cost,as a result,the total cost of location management is decreased.

Paging

Timer

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Probability Based Dynamic Channel Reservation Strategy for Reliable Handoff in Multimedia LEO Satellite Communications

IEEE International Symposium on Microwave, Antenna, Propagation and EMC Technologies for Wireless Communications (2006)

Fei Huang Shiqi Wu Hui Xu Jun Liu Bailong Xiao

Low earth orbit (LEO) satellites are deployed to provide global coverage and complement the performance of terrestrial wireless networks. In this paper, we propose a novel bandwidth allocation strategy along with a connection admission control technique aiming at improving the utilization of network resource and providing the network with better QoS guarantees such as new connection blocking probability (CBP) and handoff connection dropping probability (CDP) in multimedia LEO satellite networks. Our connection admission control scheme that we call the probability based dynamic channel reservation strategy (PDR) dynamically reserve bandwidth for real-time services based on their handoff probability, and the reserved bandwidth for real-time handoff connection can also be used by new connections under a certain probability determined by the mobility characteristics and bandwidth usage of the system. Simulation results have shown that, compared with other bandwidth allocation schemes, our scheme not only lowers the CDP for Class I real-time service, but also maintains the CBP to certain degree, thus offers very low call dropping probability for real-time connections while, at the same time, keeping resource utilization high

Call blocking

Bandwidth allocation

Call Admission Control

Blocking (statistics)

Channel allocation schemes

Admission control

Dynamic Bandwidth Allocation

Communications satellite

10.1109/mape.2005.1618226

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Citations (9)