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Book ; Online: Discrete Packet Management

Zhang, Jixiang

Analysis of Age of Information of Discrete Time Status Updating Systems

2022

Abstract: In this paper, we consider performing packet managements in discrete time status updating system, focusing on determining the stationary AoI-distribution of the system. Firstly, let the queue model be Ber/G/1/1, we obtain the AoI-distribution by ... ...

Abstract	In this paper, we consider performing packet managements in discrete time status updating system, focusing on determining the stationary AoI-distribution of the system. Firstly, let the queue model be Ber/G/1/1, we obtain the AoI-distribution by introducing a two-dimensional AoI-stochastic process and solving its steady state, which describes the random evolutions of AoI and age of packet in system simultaneously. In this case, actually we analyze a more general queue called probabilistic preemption Ber/G/1/1, where the packet service is allowed to be preempted with certain probabilities. As a special case, stationary AoI-distribution for the system with Ber/Geo/1/1 queue is obtained either. For the system having size 2, two specific queues are considered, i.e., the Ber/Geo/1/2 and Ber/Geo/1/2* queues. The core idea to find the stationary AoI-distribution is that the random transitions of three-dimensional vector including AoI at the receiver, the packet age in service, and the age of waiting packet can be fully described, such that a three-dimensional AoI process is constituted. The stationary distribution of three-dimensional process then gives the stationary AoI distribution as one of its marginal distributions. For both cases, the explicit expressions of AoI-distribution are derived, thus giving the complete description of the steady state AoI for the system. For all the cases, since the steady state of a larger-dimensional AoI process is solved, so that except the AoI-distribution, we obtain more. For instance, the distributions of packet system time and waiting time for size-two updating system, and the so-called violation probabilities that AoI exceeds certain threshold.
Keywords	Computer Science - Information Theory
Subject code	519
Publishing date	2022-04-28
Publishing country	us
Document type	Book ; Online
Database	BASE - Bielefeld Academic Search Engine (life sciences selection)

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Article ; Online: Effective enrichment of trace exosomes for the label-free SERS detection via low-cost thermophoretic profiling.

Guo, Yu / Zhang, Ruiyuan / You, Hongjun / Fang, Jixiang

Biosensors & bioelectronics

2024 Volume 253, Page(s) 116164

Abstract: Exosome-based liquid biopsies possess great potential in monitoring cancer development However, current exosome detection biosensors require large exosome volumes, showing the weak detection sensitivity. Besides, these methods pay little attention to in ... ...

Abstract	Exosome-based liquid biopsies possess great potential in monitoring cancer development However, current exosome detection biosensors require large exosome volumes, showing the weak detection sensitivity. Besides, these methods pay little attention to in situ analysis of exosomes, hence limiting the provision of more accurate clinically-relevant information. Herein, we develop an innovative label-free biosensor combining the low-cost thermophoretic enrichment method with the surface-enhanced Raman spectroscopy (SERS) detection. Based on the thermophoretic enrichment strategy, exosomes and gold nanoparticles can be enriched together into a small area with a scale of 500 μm within 10 min. The Raman signals of various exosomes derived from normal, cancerous cell lines and human serum are dynamically monitored in situ, with the limit of detection of 10
MeSH term(s)	Humans ; Exosomes ; Gold ; Biosensing Techniques ; Metal Nanoparticles ; Spectrum Analysis, Raman
Chemical Substances	Gold (7440-57-5)
Language	English
Publishing date	2024-02-23
Publishing country	England
Document type	Journal Article
ZDB-ID	1011023-9
ISSN	1873-4235 ; 0956-5663
ISSN (online)	1873-4235
ISSN	0956-5663
DOI	10.1016/j.bios.2024.116164
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Article ; Online: Discovery and Mechanism of a Nematicide Candidate (

Wang, Yu / Zhang, Yong / Wang, Sheng / Cai, Qingfeng / Song, Hongyi / Chen, Jixiang

Journal of agricultural and food chemistry

2024 Volume 72, Issue 11, Page(s) 5585–5594

Abstract: To find novel nematicides, we screened the nematicidal activity of compounds in our laboratory compound library. Interestingly, the ... ...

Abstract	To find novel nematicides, we screened the nematicidal activity of compounds in our laboratory compound library. Interestingly, the compound
MeSH term(s)	Animals ; Amides/pharmacology ; Antinematodal Agents/pharmacology ; Antinematodal Agents/chemistry ; Tylenchida ; Tylenchoidea ; Reproduction
Chemical Substances	Amides ; Antinematodal Agents
Language	English
Publishing date	2024-03-05
Publishing country	United States
Document type	Journal Article
ZDB-ID	241619-0
ISSN	1520-5118 ; 0021-8561
ISSN (online)	1520-5118
ISSN	0021-8561
DOI	10.1021/acs.jafc.3c06696
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Article ; Online: Introducing Br, K, and cyano group into carbon nitride for efficient photocatalytic hydrogen peroxide production then in situ tetracycline mineralization.

Fang, Huawei / Zhang, Yu / Xu, Jixiang / Xing, Jun / Lin, Haifeng / Wang, Lei

Journal of colloid and interface science

2024 Volume 667, Page(s) 433–440

Abstract: In this work, Br, K-doped and cyano group-rich carbon nitride (CN) were prepared via pyrolysis of molten urea and 6-Bromopyridine-3-carbaldehyde, followed by re-calcination with potassium thiocyanate. The hydrogen peroxide ( ... ...

Abstract	In this work, Br, K-doped and cyano group-rich carbon nitride (CN) were prepared via pyrolysis of molten urea and 6-Bromopyridine-3-carbaldehyde, followed by re-calcination with potassium thiocyanate. The hydrogen peroxide (H
Language	English
Publishing date	2024-04-16
Publishing country	United States
Document type	Journal Article
ZDB-ID	241597-5
ISSN	1095-7103 ; 0021-9797
ISSN (online)	1095-7103
ISSN	0021-9797
DOI	10.1016/j.jcis.2024.04.104
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Article ; Online: Interferometric modulation for generating extended light sheet: improving field of view.

Wang, Jixiang / Xu, Xin / Ye, Hong / Zhang, Xin / Shi, Guohua

Journal of biomedical optics

2024 Volume 29, Issue 4, Page(s) 46501

Abstract: Significance: Light-sheet fluorescence microscopy (LSFM) has emerged as a powerful and versatile imaging technique renowned for its remarkable features, including high-speed 3D tomography, minimal photobleaching, and low phototoxicity. The interference ... ...

Abstract	Significance: Light-sheet fluorescence microscopy (LSFM) has emerged as a powerful and versatile imaging technique renowned for its remarkable features, including high-speed 3D tomography, minimal photobleaching, and low phototoxicity. The interference light-sheet fluorescence microscope, with its larger field of view (FOV) and more uniform axial resolution, possesses significant potential for a wide range of applications in biology and medicine. Aim: The aim of this study is to investigate the interference behavior among multiple light sheets (LSs) in LSFM and optimize the FOV and resolution of the light-sheet fluorescence microscope. Approach: We conducted a detailed investigation of the interference effects among LSs through theoretical derivation and numerical simulations, aiming to find optimal parameters. Subsequently, we constructed a customized system of multi-LSFM that incorporates both interference light sheets (ILS) and noninterference light-sheet configurations. We performed beam imaging and microsphere imaging tests to evaluate the FOV and axial resolution of these systems. Results: Using our custom-designed light-sheet fluorescence microscope, we captured the intensity distribution profiles of both interference and noninterference light sheets (NILS). Additionally, we conducted imaging tests on microspheres to assess their imaging outcomes. The ILS not only exhibits a larger FOV compared to the NILS but also demonstrates a more uniform axial resolution. Conclusions: By effectively modulating the interference among multiple LSs, it is possible to optimize the intensity distribution of the LSs, expand the FOV, and achieve a more uniform axial resolution.
MeSH term(s)	Microscopy, Fluorescence/methods ; Microspheres ; Photobleaching
Language	English
Publishing date	2024-04-16
Publishing country	United States
Document type	Journal Article
ZDB-ID	1309154-2
ISSN	1560-2281 ; 1083-3668
ISSN (online)	1560-2281
ISSN	1083-3668
DOI	10.1117/1.JBO.29.4.046501
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Article ; Online: Age Analysis of Status Updating System with Probabilistic Packet Preemption

Jixiang Zhang / Yinfei Xu

Entropy, Vol 24, Iss 785, p

2022 Volume 785

Abstract: The age of information (AoI) metric was proposed to measure the freshness of messages obtained at the terminal node of a status updating system. In this paper, the AoI of a discrete time status updating system with probabilistic packet preemption is ... ...

Abstract	The age of information (AoI) metric was proposed to measure the freshness of messages obtained at the terminal node of a status updating system. In this paper, the AoI of a discrete time status updating system with probabilistic packet preemption is investigated by analyzing the steady state of a three-dimensional discrete stochastic process. We assume that the queue used in the system is <math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><mrow><mi>B</mi><mi>e</mi><mi>r</mi><mo>/</mo><mi>G</mi><mi>e</mi><mi>o</mi><mo>/</mo><mn>1</mn><mo>/</mo><msup><mn>2</mn><mo>*</mo></msup><mo>/</mo><mi>η</mi></mrow></semantics></math> , which represents that the system size is 2 and the packet in the buffer can be preempted by a fresher packet with probability <math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><mi>η</mi></semantics></math> . Instead of considering the system’s AoI separately, we use a three-dimensional state vector <math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><mrow><mo>(</mo><mi>n</mi><mo>,</mo><mi>m</mi><mo>,</mo><mi>l</mi><mo>)</mo></mrow></semantics></math> to simultaneously track the real-time changes of the AoI, the age of a packet in the server, and the age of a packet waiting in the buffer. We give the explicit expression of the system’s average AoI and show that the average AoI of the system without packet preemption is obtained by letting <math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><mrow><mi>η</mi><mo>=</mo><mn>0</mn></mrow></semantics></math> . When ...
Keywords	age of information ; discrete time status updating system ; probabilistic preemption ; probability generation function ; stationary distribution ; Science ; Q ; Astrophysics ; QB460-466 ; Physics ; QC1-999
Subject code	511
Language	English
Publishing date	2022-06-01T00:00:00Z
Publisher	MDPI AG
Document type	Article ; Online
Database	BASE - Bielefeld Academic Search Engine (life sciences selection)

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Article ; Online: The Efficiency of Respiratory Exercises in Rehabilitation of Low Back Pain: A Systematic Review and Meta-Analysis.

Zhai, Haiting / Zhang, Liqing / Xia, JiXiang / Li, Cheng

Journal of sport rehabilitation

2024 Volume 33, Issue 3, Page(s) 189–200

Abstract: Background: Low back pain (LBP) is a common musculoskeletal disorder, and respiratory exercise is considered a nonsurgical management method. Therefore, this systematic review and meta-analysis aims to estimate the results of randomized controlled ... ...

Abstract	Background: Low back pain (LBP) is a common musculoskeletal disorder, and respiratory exercise is considered a nonsurgical management method. Therefore, this systematic review and meta-analysis aims to estimate the results of randomized controlled trials on the effect of respiratory training in reducing LBP and its dose relationship. Methods: The present study was conducted from January 2020 to January 2022, following the Preferred Reporting Items for Systematic Reviews and Meta-Analyses guidelines (2020). Relevant studies were searched in multiple databases including PubMed, Web of Science, the Cochrane Library, EBSCO, Scopus, ScienceDirect, Wan Fang and China Knowledge Network, ClinicalTrials.gov, and Google Scholar, using a combination of MeSH/Emtree terms and free-text words. The heterogeneity of the studies was assessed using the I2 statistic. Results: A total of 14 publications were included in the meta-analysis, with a total sample size of 698 individuals, aged 60-80 years. Respiratory exercise was effective in relieving LBP (standardized mean difference = -0.87, P < .00001) and improving physical disability (standardized mean difference = -0.79, P < .00001). The type of breathing and the total duration of breathing exercises were found to be the source of heterogeneity in this study by subgroup analysis. Subgroup analysis revealed that the most significant effect sizes of breathing resistance exercise to reduce LBP and the most significant effect sizes of breathing relaxation techniques to alleviate physical disability were performed 3 to 5 times per week and period >4 weeks. Respiratory exercise reducing LBP and improving functional disability was most effective when the total duration of the intervention was >500 minutes. Funnel plots showed that the results of the 2 overall studies were reliable without publication bias. Conclusions: Respiratory exercise can effectively reduce LBP and improve physical disability. Therefore, these exercises can be regarded as a part of a LBP management plan. We recommend an exercise program with 30 to 50 minutes, 3 to 5 times per week, and >4 weeks of breathing resistance exercise program as the most effective for treating LBP.
MeSH term(s)	Humans ; Breathing Exercises ; Exercise Therapy ; Low Back Pain/therapy ; Musculoskeletal Diseases ; Respiration
Language	English
Publishing date	2024-02-20
Publishing country	United States
Document type	Journal Article ; Meta-Analysis ; Systematic Review
ZDB-ID	1106769-x
ISSN	1543-3072 ; 1056-6716
ISSN (online)	1543-3072
ISSN	1056-6716
DOI	10.1123/jsr.2023-0207
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Article ; Online: Clinical features and management of lymphoepithelial cyst

Cui Ning / Su Wenhao / Zhang Jixiang / Zhou Zhongyin

Open Medicine, Vol 18, Iss 1, Pp e1035-

2023 Volume 43

Abstract: The aim of the study was to analyze clinical features of lymphoepithelial cyst (LEC) to make a more comprehensive and deeper understanding of it. We retrospectively analyzed the hospital records of 201 patients who were diagnosed by pathology results. ... ...

Abstract	The aim of the study was to analyze clinical features of lymphoepithelial cyst (LEC) to make a more comprehensive and deeper understanding of it. We retrospectively analyzed the hospital records of 201 patients who were diagnosed by pathology results. Clinical characteristics like demographic profiles, lesion characteristics, therapeutic schedule, and associated costs were analyzed. Patient’s age ranged from 17 to 83 years old (52.6 ± 14.3, 120 males and 81 females). There were 12 cases of pancreatic LEC, 48 of oral LEC, and 141 of parotid LEC. Single lesion was found to be more than multiple lesions (147:54, 73.1%:26.9%). The majority of patients was primarily diagnosed by imaging test and endoscopy (171, 85.1%). All patients were finally confirmed by pathology results. Different treatment plans were selected according to personal situation, including dynamic observation (21, 10.5%), non-surgical treatment (24, 11.9%), and surgical treatment (156, 77.6%). No recurrence was found in surgical treatment patients for up to 24 months follow-up. To sum up, LEC is a rare and benign lesion, which is mostly located at parotid and oral, rarely located at pancreas. No typical symptoms could be found. EUS-FNA could be a reliable way to obtain pathological diagnosis. LEC could be cured by surgical resection with no recurrence.
Keywords	benign lesion ; asymptomatic ; eus-fna ; surgical treatment ; medical cost ; Medicine ; R
Language	English
Publishing date	2023-12-01T00:00:00Z
Publisher	De Gruyter
Document type	Article ; Online
Database	BASE - Bielefeld Academic Search Engine (life sciences selection)

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Article ; Online: Age Analysis of Status Updating System with Probabilistic Packet Preemption.

Zhang, Jixiang / Xu, Yinfei

Entropy (Basel, Switzerland)

2022 Volume 24, Issue 6

Abstract	The age of information (AoI) metric was proposed to measure the freshness of messages obtained at the terminal node of a status updating system. In this paper, the AoI of a discrete time status updating system with probabilistic packet preemption is investigated by analyzing the steady state of a three-dimensional discrete stochastic process. We assume that the queue used in the system is Ber/Geo/1/2/η, which represents that the system size is 2 and the packet in the buffer can be preempted by a fresher packet with probability η. Instead of considering the system's AoI separately, we use a three-dimensional state vector (n,m,l) to simultaneously track the real-time changes of the AoI, the age of a packet in the server, and the age of a packet waiting in the buffer. We give the explicit expression of the system's average AoI and show that the average AoI of the system without packet preemption is obtained by letting η=0. When η is set to 1, the mean of the AoI of the system with a Ber/Geo/1/2 queue is obtained as well. Combining the results we have obtained and comparing them with corresponding average continuous AoIs, we propose a possible relationship between the average discrete AoI with the Ber/Geo/1/c queue and the average continuous AoI with the M/M/1/c queue. For each of two extreme cases where η=0 and η=1, we also determine the stationary distribution of AoI using the probability generation function (PGF) method. The relations between the average AoI and the packet preemption probability η, as well as the AoI's distribution curves in two extreme cases, are illustrated by numerical simulations. Notice that the probabilistic packet preemption may occur, for example, in an energy harvest (EH) node of a wireless sensor network, where the packet in the buffer can be replaced only when the node collects enough energy. In particular, to exhibit the usefulness of our idea and methods and highlight the merits of considering discrete time systems, in this paper, we provide detailed discussions showing how the results about continuous AoI are derived by analyzing the corresponding discrete time system and how the discrete age analysis is generalized to the system with multiple sources. In terms of packet service process, we also propose an idea to analyze the AoI of a system when the service time distribution is arbitrary.
Language	English
Publishing date	2022-06-02
Publishing country	Switzerland
Document type	Journal Article
ZDB-ID	2014734-X
ISSN	1099-4300 ; 1099-4300
ISSN (online)	1099-4300
ISSN	1099-4300
DOI	10.3390/e24060785
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Article ; Online: Terpenoids from the Sponge

Xu, Jixiang / Wang, Mengxue / Liu, Zhaonan / Zhang, Wenjie / Ma, Junye / Li, Guoqiang / Li, Pinglin

Journal of natural products

2023 Volume 86, Issue 2, Page(s) 330–339

Abstract: Sarcotragusolides A-D ( ...

Abstract	Sarcotragusolides A-D (
MeSH term(s)	Humans ; Animals ; Terpenes ; Sesterterpenes/chemistry ; Diterpenes ; Antineoplastic Agents/chemistry ; Lactones ; Porifera ; Molecular Structure
Chemical Substances	Terpenes ; Sesterterpenes ; Diterpenes ; Antineoplastic Agents ; Lactones
Language	English
Publishing date	2023-02-03
Publishing country	United States
Document type	Journal Article ; Research Support, Non-U.S. Gov't
ZDB-ID	304325-3
ISSN	1520-6025 ; 0163-3864
ISSN (online)	1520-6025
ISSN	0163-3864
DOI	10.1021/acs.jnatprod.2c00937
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