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  1. Buch ; Online: A Formula for the I/O Cost of Linear Repair Schemes and Application to Reed-Solomon Codes

    Liu, Zhongyan / Zhang, Zhifang

    2024  

    Abstract: Node repair is a crucial problem in erasure-code-based distributed storage systems. An important metric for repair efficiency is the I/O cost which equals the total amount of data accessed at helper nodes to repair a failed node. In this work, a general ... ...

    Abstract Node repair is a crucial problem in erasure-code-based distributed storage systems. An important metric for repair efficiency is the I/O cost which equals the total amount of data accessed at helper nodes to repair a failed node. In this work, a general formula for computing the I/O cost of linear repair schemes is derived from a new perspective, i.e., by investigating the Hamming weight of a related linear space. Applying the formula to Reed-Solomon (RS) codes, we obtain lower bounds on the I/O cost for full-length RS codes with two and three parities. Furthermore, we build linear repair schemes for the RS codes with improved I/O cost. For full-length RS codes with two parities, our scheme meets the lower bound on the I/O cost.
    Schlagwörter Computer Science - Information Theory
    Erscheinungsdatum 2024-01-09
    Erscheinungsland us
    Dokumenttyp Buch ; Online
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  2. Artikel ; Online: Characteristics of Alveolo-palatal Affricates Produced by Mandarin-speaking Children with Repaired Cleft Palate.

    Duan, Haifeng / Xie, Qingqing / Zhang, Zhifang

    American journal of health behavior

    2023  Band 47, Heft 1, Seite(n) 13–20

    Abstract: Objectives: ...

    Abstract Objectives:
    Mesh-Begriff(e) Humans ; Child ; Child, Preschool ; Cleft Palate/surgery ; Phonetics ; Language
    Sprache Englisch
    Erscheinungsdatum 2023-03-21
    Erscheinungsland England
    Dokumenttyp Journal Article ; Research Support, Non-U.S. Gov't
    ZDB-ID 1312417-1
    ISSN 1945-7359 ; 1087-3244 ; 0147-0353
    ISSN (online) 1945-7359
    ISSN 1087-3244 ; 0147-0353
    DOI 10.5993/AJHB.47.1.2
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  3. Artikel ; Online: Decreased dynamic variability of the cerebellum in the euthymic patients with bipolar disorder.

    Chen, Zhenzhu / Zhang, Zhifang / Li, Feng / Zhao, Lei / Bo, Qijing / Zhou, Yuan / Wang, Chuanyue

    BMC psychiatry

    2024  Band 24, Heft 1, Seite(n) 137

    Abstract: Background: Bipolar disorder (BD) is a complex mental illness characterized by different mood states, including depression, mania/hypomania, and euthymia. This study aimed to comprehensively evaluate dynamic changes in intrinsic brain activity by using ... ...

    Abstract Background: Bipolar disorder (BD) is a complex mental illness characterized by different mood states, including depression, mania/hypomania, and euthymia. This study aimed to comprehensively evaluate dynamic changes in intrinsic brain activity by using dynamic fractional amplitude of low-frequency fluctuations (dfALFF) and dynamic degree centrality (dDC) in patients with BD euthymia or depression and healthy individuals.
    Methods: The resting-state functional magnetic resonance imaging data were analyzed from 37 euthymic and 28 depressed patients with BD, as well as 85 healthy individuals. Using the sliding-window method, the dfALFF and dDC were calculated for each participant. These values were compared between the 3 groups using one-way analysis of variance (ANOVA). Additional analyses were conducted using different window lengths, step width, and window type to ensure the reliability of the results.
    Results: The euthymic group showed significantly lower dfALFF and dDC values of the left and right cerebellum posterior lobe compared with the depressed and control groups (cluster level P
    Conclusions: These findings suggested that patients with euthymic BD exhibit less flexibility of temporal functional activities in the cerebellum posterior lobes compared to either depressed patients or healthy individuals. These results could contribute to the development of neuropathological models of BD, ultimately leading to improved diagnosis and treatment of this complex illness.
    Mesh-Begriff(e) Humans ; Bipolar Disorder/diagnosis ; Reproducibility of Results ; Brain ; Cyclothymic Disorder ; Cerebellum/diagnostic imaging ; Magnetic Resonance Imaging/methods
    Sprache Englisch
    Erscheinungsdatum 2024-02-19
    Erscheinungsland England
    Dokumenttyp Journal Article
    ZDB-ID 2050438-X
    ISSN 1471-244X ; 1471-244X
    ISSN (online) 1471-244X
    ISSN 1471-244X
    DOI 10.1186/s12888-024-05596-4
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  4. Buch ; Online: An Efficient Piggybacking Design Framework with Sub-packetization $l\le r$ for All-Node Repair

    Wang, Ke / Zhang, Zhifang

    2022  

    Abstract: Piggybacking design has been widely applied in distributed storage systems since it can greatly reduce the repair bandwidth with small sub-packetization. Compared with other existing erasure codes, piggybacking is more convenient to operate and the I/O ... ...

    Abstract Piggybacking design has been widely applied in distributed storage systems since it can greatly reduce the repair bandwidth with small sub-packetization. Compared with other existing erasure codes, piggybacking is more convenient to operate and the I/O cost is lower. In this paper, we propose a new efficient design which can further reduce the repair bandwidth with the sub-packetization $l\le r$ where $r = n-k$. Generally, we let $l\le 8$. Compared with other analogous designs, our design has lower $l$ and the value of $l$ is more flexible. Moreover, our design can repair all nodes with small repair bandwidth. Therefore our piggybacking design is more feasible.

    Comment: We have a better idea and this version is not complete
    Schlagwörter Computer Science - Information Theory
    Erscheinungsdatum 2022-05-19
    Erscheinungsland us
    Dokumenttyp Buch ; Online
    Datenquelle BASE - Bielefeld Academic Search Engine (Lebenswissenschaftliche Auswahl)

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  5. Artikel: Evaluating the accuracy of sonographic fetal weight estimations using the Hadlock IV formula in a Chinese population.

    Ma, Jie / Cheng, Decui / Zhang, Zhifang / Cai, Bin / Xu, Xianming

    Quantitative imaging in medicine and surgery

    2023  Band 13, Heft 6, Seite(n) 3726–3734

    Abstract: Background: Despite being the most generalized formula in China, the Hadlock IV formula has never been examined to determine if it is suitable for Chinese newborns, nor have the factors that might affect its performance been investigated. However, ... ...

    Abstract Background: Despite being the most generalized formula in China, the Hadlock IV formula has never been examined to determine if it is suitable for Chinese newborns, nor have the factors that might affect its performance been investigated. However, previous studies have reported varying results about other formulas in other nationalities. This study sought to evaluate the performance of the Hadlock IV formula in estimating fetal weight (FW) in pregnant Chinese women and use ultrasound to identify the factors affecting the accuracy of estimations of newborn weight; through these means, we aimed to create a reference for predicting neonatal weight for obstetricians.
    Methods: A retrospective observational study comprising data from 976 cases of live-birth singleton pregnancies at the Shanghai General Hospital was conducted. The participants' clinical data were examined and subjected to a logistic regression analysis to identify the multitude of possible factors affecting the estimation of FW. The proportions and correlations between the accurate and inaccurate estimation groups were compared to determine the different prognosis of these 2 groups. The correlations between the accuracy of the sonographic-based fetal weight estimation (SFWE) and newborns with different weight ranges were also analyzed.
    Results: The overall accuracy rate of the SFWE predicted by the Hadlock IV formula was 79.61%, while that of the inaccurate estimation group was only 20.39%. The incidence of spontaneous vaginal delivery (VD) was lower in the inaccurate estimation group than in the accurate estimation group (40.7%
    Conclusions: The overall performance of the Hadlock IV formula in predicting the birth weight of Chinese newborns remains suboptimal. Extra caution should be exercised in cases of suspected large-for-gestational age (LGA) infants, small-for-gestational age (SGA) infants, infants with macrosomia, or LBW fetuses in the Chinese population.
    Sprache Englisch
    Erscheinungsdatum 2023-04-03
    Erscheinungsland China
    Dokumenttyp Journal Article
    ZDB-ID 2653586-5
    ISSN 2223-4306 ; 2223-4292
    ISSN (online) 2223-4306
    ISSN 2223-4292
    DOI 10.21037/qims-22-778
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  6. Artikel ; Online: Effect of CNT film interleaves on the flexural properties and strength after impact of CFRP composites

    Li Jianbin / Zhang Zhifang / Fu Jiyang / Liang Zhihong / Hui David / Ramakrishnan Karthik Ram

    Nanotechnology Reviews, Vol 12, Iss 1, Pp 100079-

    2023  Band 95

    Abstract: Carbon nanotubes (CNTs), with their high strength, modulus, and large aspect ratio, have emerged as a frontrunner in nano-reinforcements. In this study, CNT films (CNTFs) were inserted between carbon fiber-reinforced polymer (CFRP) prepregs and were ... ...

    Abstract Carbon nanotubes (CNTs), with their high strength, modulus, and large aspect ratio, have emerged as a frontrunner in nano-reinforcements. In this study, CNT films (CNTFs) were inserted between carbon fiber-reinforced polymer (CFRP) prepregs and were cured together to form interleaved composite laminates. The influence of CNTF interleaves on the flexural and interlaminar properties of fiber-reinforced polymer (FRP) laminates is investigated. Three different types of FRP specimens were tested, namely, 0CNTs-CFRP, 2CNTs-CFRP, and 4CNTs-CFRP. The surface and internal damage characteristics and mechanism of CNTF were analyzed using scanning electron microscopy and computed tomography testing methods. The results showed that the flexural strength of 0° CNTs-CFRP beams increased by 3.79 and 14.34% for 2CNTs-CFRP and 4CNTs-CFRP, respectively, while the flexural modulus increased by 7.33 and 13.76%, respectively. It was also found that the damage area and overall deformation after impact with the energy of 5 J was reduced in the CNTF interleaved composite beams. This work has confirmed that the mechanical properties of FRP laminates can be improved by conveniently inserting CNTF during stacking prepregs in the manufacturing process. However, there is a reduction in the flexure after impact properties of the CNTF-CFRP composites, suggesting that the interface between CNTF and FRP layers should be optimized for high residual strength.
    Schlagwörter fiber reinforced polymer composites ; low velocity impact ; carbon nanotubes film ; residual flexural strength ; Technology ; T ; Chemical technology ; TP1-1185 ; Physical and theoretical chemistry ; QD450-801
    Thema/Rubrik (Code) 620 ; 690
    Sprache Englisch
    Erscheinungsdatum 2023-12-01T00:00:00Z
    Verlag De Gruyter
    Dokumenttyp Artikel ; Online
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  7. Buch ; Online: Explicit Construction of Minimum Storage Rack-Aware Regenerating Codes for All Parameters

    Zhou, Liyang / Zhang, Zhifang

    2021  

    Abstract: We consider the rack-aware storage system where $n=\bar{n}u$ nodes are organized in $\bar{n}$ racks each containing $u$ nodes, and any $k=\bar{k}u+u_0~(0\leq u_0 n$ which is almost half of the field used in Chen\&Barg's construction. Besides, our code ... ...

    Abstract We consider the rack-aware storage system where $n=\bar{n}u$ nodes are organized in $\bar{n}$ racks each containing $u$ nodes, and any $k=\bar{k}u+u_0~(0\leq u_0 n$ which is almost half of the field used in Chen\&Barg's construction. Besides, our code keeps the same access level as Chen\&Barg's low-access construction.

    Comment: 5 pages, To appear in ITW 2020
    Schlagwörter Computer Science - Information Theory
    Thema/Rubrik (Code) 003
    Erscheinungsdatum 2021-03-29
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    Dokumenttyp Buch ; Online
    Datenquelle BASE - Bielefeld Academic Search Engine (Lebenswissenschaftliche Auswahl)

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  8. Buch ; Online: Rack-Aware Regenerating Codes with Multiple Erasure Tolerance

    Zhou, Liyang / Zhang, Zhifang

    2021  

    Abstract: In a modern distributed storage system, storage nodes are organized in racks, and the cross-rack communication dominates the system bandwidth. In We study the rack-aware storage system where all storage nodes are organized in racks and within each rack ... ...

    Abstract In a modern distributed storage system, storage nodes are organized in racks, and the cross-rack communication dominates the system bandwidth. In We study the rack-aware storage system where all storage nodes are organized in racks and within each rack the nodes can communicate freely without taxing the system bandwidth. Rack-aware regenerating codes (RRCs) were proposed for minimizing the repair bandwidth for single erasures. In the initial setting of RRCs, the repair of a single node requires the participation of all the remaining nodes in the rack containing the failed node as well as a large number of helper racks containing no failures. Consequently, the repair may be infeasible in front of multiple node failures. In this work, a relaxed repair model that can tolerate multiple node failures by simultaneously reducing the intra-rack connections and cross-rack connections is proposed. A tradeoff between the storage and repair bandwidth under the relaxed repair model is derived, and parameters of the two extreme points on the tradeoff curve are characterized for the minimum storage and minimum bandwidth respectively. Moreover, two codes corresponding to the extreme points are explicitly constructed over the fields of size comparable to the code length and with the lowest sub-packetization. Finally, for the convenience of practical use, systematic encoding processes for the two codes are also established.

    Comment: 13 pages, 2 figures
    Schlagwörter Computer Science - Information Theory
    Thema/Rubrik (Code) 003
    Erscheinungsdatum 2021-06-06
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    Dokumenttyp Buch ; Online
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  9. Buch ; Online: Explicit Construction of Minimum Bandwidth Rack-Aware Regenerating Codes

    Zhou, Liyang / Zhang, Zhifang

    2021  

    Abstract: In large data centers, storage nodes are organized in racks, and the cross-rack transmission dominates the bandwidth cost. For the repair of single node failures, codes achieving the tradeoff between the storage redundancy and cross-rack repair bandwidth ...

    Abstract In large data centers, storage nodes are organized in racks, and the cross-rack transmission dominates the bandwidth cost. For the repair of single node failures, codes achieving the tradeoff between the storage redundancy and cross-rack repair bandwidth are called rack-aware regenerating codes (RRCs). In this work, we give the first explicit construction of RRCs with the minimum repair bandwidth (i.e., the cross-rack bandwidth equals the storage size per node). Our construction applies to all admissible parameters and has the lowest sub-packetization level. Moreover, the underlying finite fields are of size comparable to the number of storage nodes, which makes our codes more implementable in practice. Finally, for the convenience of practical use, we also establish a transformation to convert our codes into systematic codes.

    Comment: 7 pages, 2 figure
    Schlagwörter Computer Science - Information Theory
    Erscheinungsdatum 2021-03-02
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    Dokumenttyp Buch ; Online
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  10. Artikel ; Online: [Research progress of new vaccine adjuvants].

    Zeng, Zhen / Wang, Haining / Zhang, Zhifang / Yi, Yongzhu

    Sheng wu gong cheng xue bao = Chinese journal of biotechnology

    2021  Band 37, Heft 1, Seite(n) 78–87

    Abstract: In recent years, the development of new vaccines such as nucleic acid vaccines, genetically engineered vaccines, and synthetic peptide vaccines has achieved rapid development. However, compared with traditional inactivated or live vaccines, these ... ...

    Abstract In recent years, the development of new vaccines such as nucleic acid vaccines, genetically engineered vaccines, and synthetic peptide vaccines has achieved rapid development. However, compared with traditional inactivated or live vaccines, these vaccines often have problems such as poor immunogenicity. Therefore, an adjuvant is needed to enhance its effect, and adjuvants have proven to be a key component in vaccines. There are many types of adjuvants, while currently no unified standard for the classification. At present, the most commonly used adjuvants are Aluminum adjuvant and Freund's adjuvant, but new generation vaccines will probably need new generation adjuvants. Thus, this review aims to showcase the current status of immune adjuvants, with the focus on immunomodulatory molecular adjuvant, antigen delivery adjuvant and compound adjuvant. This review provides new insights for the development of novel vaccine adjuvants.
    Mesh-Begriff(e) Adjuvants, Immunologic/pharmacology ; Freund's Adjuvant ; Vaccines ; Vaccines, Subunit
    Chemische Substanzen Adjuvants, Immunologic ; Vaccines ; Vaccines, Subunit ; Freund's Adjuvant (9007-81-2)
    Sprache Chinesisch
    Erscheinungsdatum 2021-01-27
    Erscheinungsland China
    Dokumenttyp Journal Article ; Review
    ZDB-ID 1042206-7
    ISSN 1872-2075 ; 1042-749X
    ISSN (online) 1872-2075
    ISSN 1042-749X
    DOI 10.13345/j.cjb.200220
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