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Evaluation of internal void related defects in reinforced concrete slab using electromagnetic wave properties

Earthquake Engineering and Engineering Vibration 2024年第3期23卷 525-535页

作者： Minju Kang Jinyoung Hong taemin lee Doyun Kim Hajin Choi School of Architecture Soongsil UniversitySeoul 06978Republic of Korea

This study aims to develop a damage-detection algorithm based on the electromagnetic wave properties inside a reinforced concrete *** proposed method involves employing two algorithms based on data measured using ground-penetrating radar—a common electromagnetic wave method in civil *** possible defect area was identified based on the energy dissipated by the damage in the frequency-wavenumber domain,with the damage localized using the calculated relative permittivity of the *** proposed method was verified through a finite difference time-domain-based numerical analysis and a testing slab with artificial *** a result of verification,the proposed method quickly identified the presence of damage inside the concrete,especially for honeycomb-like defects located at the top of the *** study has practical significance in scanning structures over a large area more quickly than other non-destructive testing methods,such as ultrasonic methods.

关键词： GPR concrete defect electromagnetic wave relative permittivity non-destructive testing(NDT)

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Stroke Based Painterly Rendering with Mass Data through Auto Warping Generation

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Computer Modeling in Engineering & Sciences 2022年第3期130卷 1441-1457页

作者： taemin lee Beomsik Kim Sanghyun Seo Kyunghyun Yoon Davinci SW Education Institute Chung-Ang UniversitySeoul06974South Korea School of Computer Science and Engineering Chung-Ang UniversitySeoul06974South Korea College of Art&Technology Chung-Ang UniversityGyeonggi-do17546South Korea

Painting is done according to the artist’s *** most representative of the style is the texture and shape of the brush *** simulations allow the artist’s painting to be produced by taking this stroke and pasting it onto the *** is called stroke-based *** quality of the result depends on the number or quality of this stroke,since the stroke is taken to create the *** is not easy to render using a large amount of information,as there is a limit to having a stroke *** this work,we intend to produce rendering results using mass data that produces large amounts of strokes by expanding existing strokes through *** this,we have produced results that have higher quality than conventional ***,we also compare the correlation between the amount of data and the results.

关键词： Painterly rendering stroke based rendering image mass data stroke warping non-photorealistic rendering

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Amorphous BaTiO_(3) Electron Transport Layer for Thermal Equilibrium-Governed γ-CsPbl_(3) Perovskite Solar Cell with High Power Conversion Efficiency of 19.96%

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Energy & Environmental Materials 2024年第3期7卷 291-302页

作者： Changhyun lee Chanyong lee Kyungjin Chae taemin Kim Seaeun Park Yohan Ko Yongseok Jun Department of Energy Environment Policy and Technology Graduate School of Energy and Environment(KU-KIST Green School)Korea UniversitySeoul 02841Republic of Korea Nano Electronic Materials and Components Research Center Gumi Electronics and Information Technology Research Institute(GERI)Gumi 39171Republic of Korea Energy Materials Research Center Clean Energy Research DivisionKorea Institute of Science and Technology(KIST)Seoul 02792Republic of Korea

Compared to organic-inorganic hybrid perovskites,the cesium-based allinorganic lead halide perovskite(CsPbI_(3))is a promising light absorber for perovskite solar cells owing to its higher resistance to thermal ***,additional research is required to reduce the nonradiative recombination to realize the full potential of CsPbI_(3).Here,the diffusion of Cs ions participating in ion exchange is proposed to be an important factor responsible for the bulk defects inγ-CsPbI_(3)*** based on first-principles density functional theory reveal that the[PbI_(6)]^(4-)octahedral tilt modifies the perovskite crystallographic properties inγ-CsPbI_(3),leading to alterations in its bandgap and crystal *** addition,by substituting amorphous barium titanium oxide(a-BaTiO_(3))for TiO_(2)as the electron transport layer,interfacial defects caused by imperfect energy levels between the electron transport layer and perovskite are ***-resolution transmission electron microscopy and electron energy loss spectroscopy demonstrate that a-BaTiO_(3)forms entirely as a single phase,as opposed to Ba-doped TiO_(2)hybrid nanoclusters or separate domains of TiO_(2)and BaTiO_(3)***,inorganic perovskite solar cells based on the a-BaTiO_(3)electron transport layer achieved a power conversion efficiency of 19.96%.

关键词： amorphous BaTiO_(3) electron transport layer moisture γ-CsPbI_(3)

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Alleviating Interfacial Recombination of Heterojunction Electron Transport Layer via Oxygen Vacancy Engineering for Efficient Perovskite Solar Cells Over 23%

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Energy & Environmental Materials 2023年第2期6卷 311-322页

作者： Yohan Ko taemin Kim Chanyong lee Changhyun lee Yong Ju Yun Yongseok Jun Graduate School of Energy and Environment(KU-KIST Green School) Korea UniversitySeoul 02841Korea

Electron transport layer(ETL)is pivotal to charge carrier transport for PSCs to reach the Shockley-Queisser *** study provides a fundamental understanding of heterojunction electron transport layers(ETLs)at the atomic level for stable and efficient perovskite solar cells(PSCs).The bilayer structure of an ETL composed of SnO_(2) on TiO_(2) was examined,revealing a critical factor limiting its potential to obtain efficient *** of oxygen vacancies in the TiO_(2) underlayer via an annealing process is found to induce manipulated band offsets at the interface between the TiO_(2) and SnO_(2) ***-depth electronic investigations of the bilayer structure elucidate the importance of the electronic properties at the interface between the TiO_(2) and SnO_(2) *** apparent correlation in hysteresis phenomena,including current density-voltage(J-V)curves,appears as a function of the type of band *** functional theory calculations reveal the intimate relationship between oxygen vacancies,deep trap states,and charge transport efficiency at the interface between the TiO_(2) and SnO_(2) *** formation of cascade band alignment via control over the TiO_(2) underlayer enhances device performance and suppresses *** performance exhibits a power conversion efficiency(PCE)of 23.45%with an open-circuit voltage(V_(oc))of 1.184 V,showing better device stability under maximum power point tracking compared with a staggered bilayer under one-sun continuous illumination.

关键词： electron transport bilayer heterojunction bilayers interfacial defect oxygen vacancy engineering perovskite solar cells

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Domain-engineered BiFeO3 thin-film photoanodes for highly enhanced ferroelectric solar water splitting

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Nano Research 2018年第2期11卷 642-655页

作者： Song, Jaesun Kim, taemin Ludvic lee, Jongmin Cho, Sam Yeon Cha, Jaeseong Jeong, Sang Yun An, Hyunji Kim, Wan Sik Jung, Yen-Sook Park, Jiyoon Jung, Gun Young Kim, Dong-Yu Jo, Ji Young Bu, Sang Don Jang, Ho Won lee, Sanghan School of Materials Science and Engineering Gwangju Institute of Science and Technology (GIST) Gwangju Republic of Korea Department of Materials Science and Engineering Research Institute of Advanced Materials Seoul National University Seoul Republic of Korea Department of Physics Chonbuk National University Jeonju Republic of Korea

In photoelectrochemical （PEC） water splitting, charge separation and collection by the electric field in the photoactive material are the most important factors for improved conversion efficiency. Hence, ferroelectric oxides, in which electrons are the majority carriers, are considered promising photoanode materials because their high built-in potential, provided by their spontaneous polarization, can signifi＇canfly enhance the separation and drift of photogenerated carriers. In this regard, the PEC properties of BiFeO3 thin-film photoanodes with different crystallographic orientations and consequent ferroelectric domain structures are investigated. As the crystallographic orientation changes from （001）pc via （ll0）pc to （lll）p~, the ferroelastic domains in epitaxial BiFeO3 thin films become mono-variant and the spontaneous polarization levels increase to 110 btC/cm2. Consequent136 the photocurrent density at 0 V vs. Ag/AgC1 increases approximately 5.3-fold and the onset potential decreases by 0.180 V in the downward polarization state. It is further demonstrated that ferroelectric switching in the （lll）pc BiFeO3 thin-film photoanode leads to an approximate change of 8,000% in the photocurrent density and a 0.330 V shift in the onset potential. This study strongly suggests that domain-engineered ferroelectric materials can be used as effective charge separation and collection layers for efficient solar water-splitting photoanodes.

关键词： BiFeO3 ferroelectric photoelectrochemical domain orientation pulsed laser deposition

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高硫条件下满足欧Ⅳ排放法规柴油机微粒过滤器系统的开发(英文)

高硫条件下满足欧Ⅳ排放法规柴油机微粒过滤器系统的开发(英文)

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2008中国汽车工程学会年会

作者： Kim taemin lee HaeSoo Kim MoonChan E&D Corporate Ltd. 327-32 Gasan-dongGeumcheon-gu Department of Environmental engineering Cheongju University

柴油机由于热效率高、燃油经济性和耐久性能好作为动力得到广泛应用,可是其排放的微粒带来空气的污染和各种健康问题。据此,目前世界各国都在讨论和制订更加严格的针对微粒排放的法规。为满足这样的法规,柴油机厂商正在研究各种各样的... 详细信息

柴油机由于热效率高、燃油经济性和耐久性能好作为动力得到广泛应用,可是其排放的微粒带来空气的污染和各种健康问题。据此,目前世界各国都在讨论和制订更加严格的针对微粒排放的法规。为满足这样的法规,柴油机厂商正在研究各种各样的技术和有效的方法。本文研究的是在优化NO排放发动机的基础上,采用微粒过滤器,使其排放从满足欧Ⅲ到满足欧Ⅳ。在柴油机微粒过滤器系统中使用的是金属过滤器(部分流深床层过滤器),催化剂以薄膜的方式涂在金属过滤器上,使其在高硫条件下保持活性。根据发动机功率试验的评估,部分流柴油机微粒过滤器系统满足欧Ⅳ排放标准。结果显示新型催化剂在高硫条件下具有很好的活性和耐久性,能够保证微粒过滤器原有的性能。微粒的减少表明采用部分流微粒过滤器可以作为满足欧Ⅳ排放标准的一个方案。

关键词：柴油机微粒过滤器金属过滤器欧-Ⅳ 高硫催化剂

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