MAEKAWA Koichi

Affiliation

Faculty of Urban Innovation, Division of Urban Innovation

Job Title

Professor

Research Fields, Keywords

concrete engineering

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The Best Research Achievement in Research Career 【 display / non-display

The Best Research Achievement in the last 5 years 【 display / non-display

Education 【 display / non-display

  • 1980.4
    -
    1982.3

    The University of Tokyo   Department of Civil Engineering   Master Course   Completed

  • 1976.4
    -
    1980.3

    The University of Tokyo   Civil Engineering   Graduated

Degree 【 display / non-display

  • Doctor of Engineering - The University of Tokyo

Campus Career 【 display / non-display

  • 2017.4
     
     

    Duty   Yokohama National UniversityFaculty of Urban Innovation   Division of Urban Innovation   Professor  

  • 2017.4
     
     

    Concurrently   Yokohama National UniversityCollege of Engineering Science   Department of Architecture,Infrastructure,Ocean Engineering and Ecosystem Science   Professor  

  • 2017.4
     
     

    Concurrently   Yokohama National UniversityCollege of Urban Sciences   Department of Civil Engineering    Professor  

  • 2017.4
     
     

    Concurrently   Yokohama National UniversityGraduate School of Urban Innovation   Department of Infrastructure and Urban Society   Professor  

External Career 【 display / non-display

  • 2018.6
     
     

    The University of Tokyo   Professor Emeritus  

  • 2016
     
     

    Nanyang Technological University   Professor  

  • 2015
     
     

    Asian Institute of Technology   Professor  

  • 1996.4
    -
    2018.3

    The University of Tokyo   Department of Civil Engineering   Professor  

  • 1992.5
    -
    1994.4

    Asian Institute of Technology   Structural Engineering Division   Associate Professor  

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Academic Society Affiliations 【 display / non-display

  • 1980.4
     
     
     

    Japan Society of Civil Engineers

  • 1980.4
     
     
     

    Japan Concrete Institute

  • 2019.4
     
     
     

    日本機械学会

  • 2005
     
     
     

    地盤工学会

  • 2004
     
     
     

    Asian Concrete Federation

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Research Areas 【 display / non-display

  • Social Infrastructure (Civil Engineering, Architecture, Disaster Prevention) / Structure engineering and earthquake engineering

  • Social Infrastructure (Civil Engineering, Architecture, Disaster Prevention) / Civil engineering material, execution and construction management

 

Research Career 【 display / non-display

  • Life cycle infra-stock assessment and management

    The Other Research Programs  

    Project Year: 2007.4

  • Thermodynamics and durability mechanics of structural concrete

    Basic Science Research Program  

    Project Year: 1992.4

  • Nonlinear dynamic analysis of reinforced concrete structures

    Basic Science Research Program  

    Project Year: 1988.4 - 2005.3

  • Development of self-compacting concrete

    Pre-Project Research on Leading Construction Technology  

    Project Year: 1985.4 - 1990.3

  • Constitutive Modeling of Reinforced Concrete

    Basic Science Research Program  

    Project Year: 1982.4 - 1992.3

Books 【 display / non-display

  • Multi-Scale Modeling of Structural Concrete

    Koichi Maekawa, Tetsuya Ishida, Toshiharu Kishi( Role: Joint author ,  All chapters)

    CRC Press  ( ISBN:9780415465540

    Amazon

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    Total pages:658   Responsible for pages:all   Language:English Book type:Scholarly book

  • Nonlinear Mechanics of Reinforced Concrete

    Koichi Maekawa, Amon Pimanmas, Hajime Okamura( Role: Joint author ,  All chapters)

    CRC Press  ( ISBN:9780415271264

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    Total pages:768   Responsible for pages:all   Language:English Book type:Scholarly book

  • Modelling of Concrete Performance

    Koichi Maekawa, Rajesh Chaube, Toshiharu Kishi( Role: Joint author)

    CRC Press  ( ISBN:9780429081002

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    Total pages:328   Language:English Book type:Scholarly book

  • High Performance Concrete

    Hajime Okamura, Koichi Maekawa, Kazumasa Ozawa( Role: Joint author)

    ( ISBN: 4-7655-1530-3

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    Total pages:270   Language:Japanese Book type:Scholarly book

  • Nonlinear Analysis and Constitutive Models of Reinforced Concrete

    Hajime Okamura, Koichi Maekawa( Role: Joint author)

    ( ISBN:4765515060

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    Total pages:182   Language:English Book type:Scholarly book

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Thesis for a degree 【 display / non-display

Papers 【 display / non-display

  • Spatial characteristics of stray current corrosion of reinforcing bars in pseudo concrete

    Yizhan Peng, Zhao Wang, Fuyuan Gong, Yuxi Zhao, Tao Meng, Weiliang Jin, Koichi Maekawa

    Structural Concrete   2022.6  [Reviewed]

    DOI

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    Authorship:Last author   Language:English   Publishing type:Research paper (scientific journal)   Single Work  

  • Hardened Mechanical Properties of Self Compacting Geopolymer Mortar

    Muhammad Talha-Ghafoor, Chikako Fujiyama, Koichi Maekawa

    Journal of Advanced Concrete Technology   20 ( 4 )   287 - 299   2022.4  [Reviewed]

    DOI

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    Authorship:Corresponding author   Language:English   Publishing type:Research paper (scientific journal)   Single Work  

  • Effect of Multi-directional Restraint Induced by Reinforced Steel Bars on ASR Expansion and Bond Performance

    Pengfei Li, Ni Tan, Xuehui An, Koichi Maekawa, Mingqian Ren

    Journal of Advanced Concrete technology   20 ( 4 )   342 - 358   2022.4  [Reviewed]

    DOI

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    Language:English   Publishing type:Research paper (scientific journal)   Publisher:Japan Concrete Institute   Joint Work  

  • Simulation of concrete structures deformation affected by alkali-silica reaction considering environmental conditions and multiaxial stress state

    Xi Ji,Yuya Takahashi, Takuya Maeshima, Ichiro Iwaki and Koichi Maekawa

    Structure and Infrastructure Engineering   2022.4  [Reviewed]

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    Authorship:Last author, Corresponding author   Language:English   Publishing type:Research paper (scientific journal)   Joint Work  

  • Modelling of carbonation, de-carbonation and re-carbonation processes of structural concrete subjected to high temperature heating

    Ketitai Iwama, Koichi Maekawa

    Cement and Concrete Composite   129   2022.3  [Reviewed]

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    Authorship:Last author   Language:English   Publishing type:Research paper (scientific journal)   Publisher:Elsevier   Joint Work  

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Review Papers 【 display / non-display

  • 施工現場の生産性向上に資するレディーミクストコンクリート品質管理・検査の省人化・省力化および高度化に関する提案

    橋本 学、坂田 昇、前川宏一、原田修輔

    月刊コンクリートテクノ   40 ( 11 )   52 - 57   2021.11  [Reviewed]  [Invited]

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    Language:Japanese   Publishing type:Article, review, commentary, editorial, etc. (other)   Publisher:セメント新聞社   Joint Work  

  • 画像解析とAIを活用したフレッシュコンクリートのコンシステンシー評価手法の全数管理への適用性

    大友健・畠山峻一・清水堅・前川宏一

    コンクリート工学   59 ( 7 )   589 - 597   2021.7  [Reviewed]  [Invited]

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    Language:Japanese   Publishing type:Article, review, commentary, editorial, etc. (scientific journal)   Publisher:日本コンクリート工学会   Single Work  

  • 洋上風力発電推進のための最近のコンクリート技術

    藤山知加子,前川宏一

    日本風力エネルギー学会誌   44 ( 4 )   587 - 590   2021.2

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    Language:Japanese   Publishing type:Article, review, commentary, editorial, etc. (scientific journal)   Publisher:日本風力エネルギー学会誌   Joint Work  

  • 床版の調査・診断技術(特集:総論:道路橋床版の調査・診断の高度化技術)

    前川宏一

    橋梁と基礎   54   2020.8

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    Language:Japanese   Publishing type:Article, review, commentary, editorial, etc. (trade magazine, newspaper, online media)   Publisher:建設図書   Single Work  

  • 都市と国土の更新に向けたコンクリート構造

    前川宏一

    コンクリート工学   58 ( 5 )   334 - 339   2020.5

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    Language:Japanese   Publishing type:Article, review, commentary, editorial, etc. (bulletin of university, research institution)   Publisher:日本コンクリート工学会   Single Work  

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Industrial Property Rights 【 display / non-display

  • 床版構造体の施工方法

    前川宏一,石田哲也,荒井明夫,岩城一郎

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    Application no:JP20150080197  Date applied:2015.4.9

    Announcement no:JP2016199904  Date announced:2016.12.1

    Patent/Registration no:JP6512908B  Date issued:2019.5.15

    Country of applicant:Domestic  

  • コンクリート舗装構造体の施工方法

    岩城一郎,荒井明夫,石田哲也,前川宏一

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    Application no:JP20150080252  Date applied:2015.4.9

    Announcement no:JP2016199908  Date announced:2016.12.1

    Country of applicant:Domestic  

  • 鉄筋コンクリートの補強構造及び補強工法

    前川宏一,平塚慶達

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    Application no:JP20150050299  Date applied:2015.3.13

    Announcement no:JP2016169543  Date announced:2016.9.23

    Country of applicant:Domestic  

  • 構造物情報提供システム

    菅野晶夫,矢野裕司,尾暮敏範,津野和宏,石田哲也,前川宏一,土橋 浩

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    Application no:JP20150019759  Date applied:2015.2.3

    Announcement no:JP2016142662  Date announced:2016.8.8

    Patent/Registration no:JP6284240B  Date issued:2018.2.28

    Country of applicant:Domestic  

  • コンクリートの補強構造及びその補強工法

    平塚慶達,前川 宏一

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    Application no:JP20140141053  Date applied:2014.7.9

    Announcement no:JP2016017330  Date announced:2016.2.1

    Patent/Registration no:JP6511231B  Date issued:2019.5.15

    Country of applicant:Domestic  

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Awards 【 display / non-display

  • Best Research Award

    2022.3   Yokohama National University  

    Individual or group name of awards:Koichi Maekawa

  • 日本コンクリート工学会賞論文賞

    2021.6   日本コンクリート工学会   Thermo-Mechanistic Multi-Scale Modeling of Structural Concrete at High Temperature

    Individual or group name of awards:岩間慧大,樋口和朗,前川宏一

  • The three excellent papers of the year 2019-2020

    2020.9   Journal of Advanced Concrete Technology   Thermo-mechanistic multi-scale modeling of structural concrete at high temperature

    Individual or group name of awards:Keitai Iwama, Kazuaki Higuchi, Koichi Maekawa

  • Japan Concrete Institute Prize (research)

    2019.6   Japan Concrete Institute   Computational Life Assessment of ASR-damaged RC Decks by Site-Inspection Data Asimilation

    Individual or group name of awards:Yuya Takahashi, Yasushi Tanaka, Koichi Maekawa

  • Japan Concrete Institute Prize (research)

    2018.6   Japan Concrete Institute   Remaining Fatigue Life Assessment of Damaged RC Decks -Data Assimilation of Multi-scale Model and Site Inspection-

    Individual or group name of awards:Yasushi Tanaka, Yuya Takahashi, Koichi Maekawa

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Grant-in-Aid for Scientific Research 【 display / non-display

  • 構造コンクリートの長期安全性評価と広帯域温度に対応した複合耐久性力学

    2020.11 - 2023.3

    科学研究費補助金  Grant-in-Aid for JSPS Fellows

    Investigator(s):前川宏一

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    Grant type:Competitive

  • 広帯域環境下にあるセメント系複合材料の耐久性力学と構造性能評価

    2020.4 - 2023.3

    科学研究費補助金  Grant-in-Aid for Scientific Research(A)

    Investigator(s):前川宏一

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    Grant type:Competitive

  • Long-term dynamic simulation of large-scale RC-PC infrastructures based on quasi thermo-hygral modeling

    2011.4 - 2016.3

    Grant-in-Aid for Scientific Research  Grant-in-Aid for Scientific Research(S)

    Investigator(s):Koichi Maekawa

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    Grant type:Competitive

  • コンクリート系床版に内在する凝縮水の動態による早期疲労限界状態

    2011.4 - 2012.3

    科学研究費補助金  Grant-in-Aid for Scientific Research(A)

    Investigator(s):前川宏一

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    Grant type:Competitive

  • 高サイクル荷重と環境作用を同時に受けるコンクリート構造のマルチスケール耐久性力学

    2008.4 - 2011.3

    科学研究費補助金  Grant-in-Aid for Scientific Research(A)

    Investigator(s):前川宏一

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    Grant type:Competitive

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Other external funds procured 【 display / non-display

  • 道路インフラマネジメントサイクルの展開と国内外への実装を目指した統括的研究

    2018.4 - 2019.3

    Japan Science and Technology Agency  戦略的イノベーション創造プログラム(SIP)

    Investigator(s):石田哲也

  • 道路インフラマネジメントサイクルの展開と国内外への実装を目指した統括的研究

    2013.11 - 2018.3

    Japan Science and Technology Agency  戦略的イノベーション創造プログラム(SIP)

    Investigator(s):前川宏一

  • 非線形疲労応答解析に基づくコンクリート系橋梁床版の余寿命推定システム

    2010.8 - 2012.3

    Ministry of Land, Infrastructure and Transport  国土交通省建設技術研究開発助成制度

Presentations 【 display / non-display

  • Accelerated Moisture Transport through Local Weakness of High-Strength Concrete Exposed to High Temperature

    Iwama Keitai, Kato Yushi, Baba Shigeaki, Higuchi Kazuaki, Maekawa Koichi

    Journal of Advanced Concrete Technology  公益社団法人 日本コンクリート工学会

    DOI

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    Event date: 2021

    Language:Japanese   Presentation type:Other  

    <p>Spilling out of condensed liquid water from needle-like holes in high-strength concrete was experimentally observed under fire attack. The presence of these holes was found to prevent explosive spalling effectively in the vicinity of the holes during fire exposure tests. This spilling out occurred at about 10 to 30 minutes after the start of high temperature heating. These needle-like holes are defined herein as local weaknesses that may act as rapid paths of water permeation to reduce the risk of explosive spalling of cover concrete. The phase change of moisture from CSH solids to condensed liquid as well as free water in micro-pores was simulated by a multi-phase chemo-physics analysis of ultra-high-strength concrete. The prediction of the high-rate phenomena was experimentally proved by using embedded moisture sensor, and the high-rate discharge of condensed water though local weaknesses was analytically simulated.</p>

  • Multi-Directional Fixed Crack Model Extended to Masonry Structures

    Yamanoi Yuto, Miura Takashi, Soltani Masoud, Maekawa Koichi

    Journal of Advanced Concrete Technology  公益社団法人 日本コンクリート工学会

    DOI

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    Event date: 2021

    Language:Japanese   Presentation type:Other  

    <p>The mechanical nonlinearity of a masonry structure depends on debonding and slip of masonry joints and the fracture of blocks like bricks and concrete. The present study proposes a behavioral simulation to idealize masonry joints by allocating three orthogonal planes, which are governed by the existing multi-directional crack model, and to represent the damage of blocks by using another three crack planes. The shear stiffness of the joint changes due to the disintegration of the infilling mortar caused by the shear slip of the joint, as well as the confining pressure dependence of the shear strength. Shear response analysis of a masonry structure considering this disintegration was carried out, and the applicability of the analysis model was validated. The following three types of structures were selected for validation: 1) masonry structures in which both joints and masonry blocks are damaged, 2) structures in which masonry blocks are primarily damaged but deformation is not concentrated in the joints, and 3) structures in which mortar joints are exclusively damaged but the masonry blocks are exempt of damage. It was confirmed that the proposed analysis model can analyze the damage mode of masonry structures. It evaluates yield strength as well and deformability is estimated on the safe side of an engineering viewpoint.</p>

  • Numerical analysis on fracture behavior of full-scale RC member subjected to horizontal bilateral loadings

    Komatsu Satoshi, Nagata Seiji, Matsuo Toyofumi, Hata Akihito, Maekawa Koichi

    Journal of Structural Engineering, A  Japan Society of Civil Engineers

    DOI

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    Event date: 2021

    Language:Japanese   Presentation type:Other  

    <p>In this paper, the accuracy of analysis results for the full-scale RC members subjected to repeated horizontal bilateral loadings was verified by 3D material nonlinear FEM. Then, fracture behaviors of the RC members were analyzed. Finally, fracture behaviors of RC frames were also analyzed as case studies. As the results, the difference of maximum load capacity between the analysis and the experiments was less than 30%. It was also found that failure mode of the members could be predicted except for the retrofitted one. Finally, it was revealed that in case of in-plane shear failure of RC frame, the load capacity of RC frame with less shear reinforcements in out of plane direction was decreased due to initial damages in out of plane direction compared with that without initial damages.</p>

  • RESEARCH ON EARTHQUAKE DYNAMIC BEHAVIOR OF SUBWAY MULTI- SECTION TUNNEL IN TRANSVERSE DIRECTION

    OTSUKA Tsutomu, SASAKI Kota, NITTA Hiroki, KONISHI Shinji, TSUNO Kiwamu, SANAGAWA Taisuke, KAMADA Kazutaka, TSUCHIYA Satoshi, MAEKAWA Koichi

    Journal of Japan Society of Civil Engineers, Ser. F2 (Underground Space Research)  Japan Society of Civil Engineers

    DOI

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    Event date: 2020

    Language:Japanese   Presentation type:Other  

    <p> This research carries out model tests to investigate the dynamic behavior of multi-section cut-and-cover subway tunnels in transvers direction by seismic motion, which has not been fully investigated. A multi-section model tunnel as well as a general single box type one is installed in a soil vessel and it is found that the sectional force corresponds to those obtained by tunnel design. Then, the L2 earthquake motion (Spectrum II) based on design standard for railway structures is applied to the soil vessel. The results show that the bending moment and shear force are comparatively large in the center wall, the tendency is different among the loading direction. Moreover, the results of 3D dynamic finite element analysis for evaluation of model tests shows approximately the same situation and this research gives various findings to establish the seismic analysis method of multi-section cut-and-cover subway tunnels.</p>

  • DURABILITY EVALUATION WITH WHEEL RUNNING TESTS AND COMPUTATIONAL SIMULATIONS ON PRECAST PC SLAB WITH HALF RIGID JOINT UNDER THE NEGATIVE BENDING MOMENT

    KITA Shinichiro, SAKURAI Nobuaki, MAEKAWA Koichi

    Journal of Japan Society of Civil Engineers, Ser. E2 (Materials and Concrete Structures)  Japan Society of Civil Engineers

    DOI

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    Event date: 2020

    Language:Japanese   Presentation type:Other  

    <p> Wheel running tests have been conducted on precast PC slabs jointed with only fillers under the maximum negative bending moment assumed on the intermediate support of actual plate girder bridge. Constant repetitive moving load of 250kN was applied on Slabs jointed with polymer cement mortar and epoxy resin mortar, and these specimens showed interfacial fracture with smaller number of cycles than expected. Meanwhile, tensile fatigue tests have been also conducted on two kinds of fillers, and the different S-N curves were observed between the fillers and concrete.</p><p> Considering the above tests, computational simulations have been conducted. Firstly, the history of the stress on the interference of joints until initial damage was investigated by reproducing wheel running tests. Secondly, the actual durability of slabs jointed with the fillers was evaluated by parametric analysis with negative bending moment and repetitive moving load.</p>

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Charge of on-campus class subject 【 display / non-display

  • 2022   Studio for creative infrastructures S

    Graduate School of Urban Innovation

  • 2022   Studio for creative infrastructures F

    Graduate School of Urban Innovation

  • 2022   Studio for infrastructure management S

    Graduate School of Urban Innovation

  • 2022   Studio for infrastructure management F

    Graduate School of Urban Innovation

  • 2022   Studio for infrastructure 4

    Graduate School of Urban Innovation

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Committee Memberships 【 display / non-display

  • 日本学術会議

    2020.10  第三部会員(土木工学・建築学)

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    Committee type:Government 

  • 日本学術会議

    2017.10 - 2020.9  第三部会員・土木工学建築学委員会副委員長

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    Committee type:Government 

  • 土木研究所 外部評価委員会戦略的維持管理・更新分科会

    2016.4  分科会長

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    Committee type:Government 

  • コンクリート生産性向上検討協議会

    2016.4  会長

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    Committee type:Government 

  • 新道路技術会議

    2016 - 2020.9  委員長

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    Committee type:Government 

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