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Structural and electrochemical stabilization enabling high-energy P3-type Cr-based layered oxide cathode for K-ion batteries

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Carbon Energy 2024年第5期6卷 81-93页

作者： Wonseok Ko Seokjin Lee Hyunyoung Park Jungmin Kang jinho Ahn Yongseok Lee Gwangeon Oh Jung-Keun Yoo Jang-Yeon Hwang Jongsoon kim Department of Energy Science Sungkyunkwan UniversitySuwonRepublic of Korea SKKU Institute of Energy Science and Technology(SIEST) Sungkyunkwan UniversitySuwonRepublic of Korea Department of Energy Engineering Hanyang UniversitySeoulRepublic of Korea Carbon Composites Department Korea Institute of Materials Science(KIMS)ChangwonRepublic of Korea Department of Battery Engineering Hanyang UniversitySeoulRepublic of Korea

Layered-type transition metal(TM)oxides are considered as one of the most promising cathodes for K-ion batteries because of the large theoretical gravimetric capacity by low molar ***,they suffer from severe structural change by de/intercalation and diffusion of K^(+)ions with large ionic size,which results in not only much lower reversible capacity than the theoretical capacity but also poor power ***,it is important to enhance the structural stability of the layered-type TM oxides for outstanding electrochemical behaviors under the K-ion battery ***,it is investigated that the substitution of the appropriate Ti^(4+)contents enables a highly enlarged reversible capacity of P3-type KxCrO_(2) using combined studies of first-principles calculation and various *** the pristine P3-type KxCrO_(2) just exhibits the reversible capacity of∼120 mAh g^(−1) in the voltage range of 1.5-4.0 V(vs.K^(+)/K),the∼0.61 mol K^(+)corresponding to∼150 mAh g^(−1) can be reversible de/intercalated at the structure of P3-type K0.71[Cr_(0.75)Ti_(0.25)]O_(2) under the same ***,even at the high current density of 788 mA g^(−1),the specific capacity of P3-type K0.71[Cr_(0.75)Ti_(0.25)]O_(2) is∼120 mAh g^(−1),which is∼81 times larger than that of the pristine P3-type KxCrO_(2).It is believed that this research can provide an effective strategy to improve the electrochemical performances of the cathode materials suffered by severe structural change that occurred during charge/discharge under not only K-ion battery system but also other rechargeable battery systems.

关键词： cathodes first-principles calculations layered-type oxide materials potassium-ion batteries structural stabilization

Label-Free White Blood Cell Classification Using Refractive Index Tomography and Deep Learning

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Biomedical Engineering Frontiers 2021年第1期2卷 18-26页

作者： DongHun Ryu jinho kim Daejin Lim Hyun-Seok Min In Young Yoo Duck Cho YongKeun Park Department of Physics Korea Advanced Institute of Science and Technology(KAIST)Daejeon 34141Republic of Korea KAIST Institute for Health Science and Technology KAISTDaejeon 34141Republic of Korea Department of Health Sciences and Technology Samsung Advanced Institute For Health Sciences and TechnologySungkyunkwan UniversitySeoul 06355Republic of Korea Department of Health and Safety Convergence Science Korea UniversitySeoul 02841Republic of Korea Department of Laboratory Medicine and Genetics Samsung Medical CenterSungkyunkwan University School of MedicineSeoul 06351Republic of Korea Tomocube Inc.Daejeon 34051Republic of Korea Department of Laboratory Medicine Seoul St.Mary’s HospitalCollege of MedicineThe Catholic University of KoreaSeoul 06591Republic of Korea Stem Cell&Regenerative Medicine Institute Samsung Medical CenterSeoul 06531Republic of Korea

Objective and Impact *** propose a rapid and accurate blood cell identification method exploiting deep learning and label-free refractive index(RI)*** computational approach that fully utilizes tomographic information of bone marrow(BM)white blood cell(WBC)enables us to not only classify the blood cells with deep learning but also quantitatively study their morphological and biochemical properties for hematology *** methods for examining blood cells,such as blood smear analysis by medical professionals and fluorescence-activated cell sorting,require significant time,costs,and domain knowledge that could affect test *** label-free imaging techniques that use a specimen’s intrinsic contrast(e.g.,multiphoton and Raman microscopy)have been used to characterize blood cells,their imaging procedures and instrumentations are relatively time-consuming and *** RI tomograms of the BM WBCs are acquired via Mach-Zehnder interferometer-based tomographic microscope and classified by a 3D convolutional neural *** test our deep learning classifier for the four types of bone marrow WBC collected from healthy donors(n=10):monocyte,myelocyte,B lymphocyte,and T *** quantitative parameters of WBC are directly obtained from the *** results show>99%accuracy for the binary classification of myeloids and lymphoids and>96%accuracy for the four-type classification of B and T lymphocytes,monocyte,and *** feature learning capability of our approach is visualized via an unsupervised dimension reduction *** envision that the proposed cell classification framework can be easily integrated into existing blood cell investigation workflows,providing cost-effective and rapid diagnosis for hematologic malignancy.

关键词： Blood diagnosis utilize

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Preface

Journal of Computer Science & Technology 2013年第4期28卷 583-584页

作者： jinho kim Sang-Wook kim Sanghyun Park Haixun Wang Department of Computer Science Kangwon National University Department of Computer Science and Engineering Hanyang University Department of Computer Science Yonsei University Research Scientist Google Research

It is our great pleasure to edit this special section of the Journal of Computer Science and Technology （JCST）. The database field has experienced a rapid growth with increasing of data. Therefore, novel technology for covering emerging databases such as network or graph analysis, spatial or temporal data analysis, search, recommendation, and data mining is required. The goal of the section is to provide state-of-the-art research issues, challenges, new technologies, and solutions of emerging databases. This section publishes seven interesting articles related to query processing, trajectory data reduction, botnet evolution, recommendation system, bielustering, and protein structure alignment. The articles are summarized as follows.

关键词： pleasure special section JCST

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Femtosecond mode-locking of a fiber laser using a CoSb_3-skutterudite-based saturable absorber

作者： (美)托马斯·达文波特(Thomas H. Davenport) 金镇浩(jinho kim)

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Photonics Research 2018年第10期6卷 I0038-I0045页

作者： jinho LEE YOONTAEK kim KYUNGTAEK LEE JU HAN LEE School of Electrical and Computer Engineering University of Seoul

We experimentally demonstrate an ultrafast mode-locker based on a CoSb_3 skutterudite topological insulator for femtosecond mode-locking of a fiber laser. The mode-locker was implemented on a side-polished fiber platform by depositing a CoSb_3∕PVA composite. The measured modulation depth and saturation power for the transverse-electric mode input were ～5% and ～8.7 W, respectively, and ～2.8% and ～10.6 W for the transverse-magnetic mode input. By incorporating this mode-locker into an erbium-doped fiber-based ring cavity, we were able to readily generate mode-locked, soliton pulses having a pulse width of ～833 fs at 1557.9 nm. The 3-dB bandwidth of the output pulses and time-bandwidth product were ～3.44 and 0.353 nm, respectively. To the best of the authors' knowledge, this is the first demonstration of the use of a skutterudite-based saturable absorber for femtosecond mode-locked pulse generation.

关键词：晶格光纤激光器通讯技术发展现状

Multi-redox phenazine/non-oxidized graphene/cellulose nanohybrids as ultrathick cathodes for high-energy organic batteries

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Nano Research 2021年第5期14卷 1382-1389页

作者： Youngjin Ham Vitalii Ri Jin kim Yeoheung Yoon jinho Lee Kisuk Kang Ki-Seok An Chunjoong kim Seokwoo Jeon Department of Materials Science and Engineering Advanced Battery CenterKorea Advanced Institute of Science and Technology(KAIST)Daejeon34141Republic of Korea Department of Materials Science and Engineering Chungnam National UniversityDaejeon34134Republic of Korea Thin Film Materials Research Center Korea Research Institute of Chemical Technology(KRICT)Daejeon34114Republic of Korea Department of Materials Science and Engineering Seoul National UniversitySeoul08826Republic of Korea

Various redox-active organic molecules can serve as ideal electrode materials to realize sustainable energy storage systems. Yet, to be more appropriate for practical use, considerable architectural engineering of an ultrathick, high-loaded organic electrode with reliable electrochemical performance is of crucial importance. Here, by utilizing the synergetic effect of the non-covalent functionalization of highly conductive non-oxidized graphene flakes (NOGFs) and introduction of mechanically robust cellulose nanofiber (CNF)-intermingled structure, a very thick (≈ 1 mm), freestanding organic nanohybrid electrode which ensures the superiority in cycle stability and areal capacity is reported. The well-developed ion/electron pathways throughout the entire thickness and the enhanced kinetics of electrochemical reactions in the ultrathick 5,10-dihydro-5,10-dimethylphenazine/NOGF/CNF (DMPZ-NC) cathodes lead to the high areal energy of 9.4 mWh·cm−2 (= 864 Wh·kg−1 at 158 W·kg−1). This novel ultrathick electrode architecture provides a general platform for the development of the high-performance organic battery electrodes.

关键词： energy storage organic electrodes batteries graphene cellulose nanofibers

Properties of Ultra-Thin Hafnium Oxide and Interfacial Layer Deposited by Atomic Layer Deposition

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Journal of Rare Earths 2004年第Z2期22卷 21-25页

作者： Taeho Lee Young-Bae kim Kyung-Il Hong Duck-Kyun Choi jinho Ahn Department of Material Science&Engineering Hanyang University17 Haengdang-dongSeongdong-guSeoul 133-791Korea Department of Ceramic Engineering Hanyang University17 Haengdang-dongSeongdong-guSeoul 133-791Korea

Ultra-thin hafnium-oxide gate dielectric films deposited by atomic layer deposition technique using HfCl4 and H2O precursor on a hydrogen-terminated Si substrate were investigated. X-ray photoelectron spectroscopy indicates that the interface layer is Hf-silicate rather than phase separated Hf-silicide and silicon oxide structure. The Hf-silicate interfacial layer partially changes into SiOx after high temperature annealing, resulting in a complex HfO2-silicate-SiOx dielectric structure. Electrical measurements confirms that HfO2 on Si is stable up to 700 ℃ for 30 s under N2 ambient.

关键词： atomic layer deposition high-k dielectric HfO2 interface thermal stability

Unexpected Li displacement and suppressed phase transition enabling highly stabilized oxygen redox in P3-type Na layered oxide cathode

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Journal of Energy Chemistry 2023年第10期85卷 144-153,I0006页

作者： Myungeun Choi Hobin Ahn Hyunyoung Park Yongseok Lee jinho Ahn Bonyoung Ku Junseong kim Wonseok Ko Jungmin Kang Jung-Keun Yoo Duho kim Jongsoon kim Department of Energy Science Sungkyunkwan UniversitySuwon 16419Republic of Korea SKKU Institute of Energy Science and Technology(SIEST) Sungkyunkwan UniversitySuwon 16419Republic of Korea Carbon Composites Department Korea Institute of Materials Science(KIMS)Changwon 51508Republic of Korea Department of Mechanical Engineering(Integrated Engineering Program) Kyung Hee University1732Deogyeong-daeroGiheung-guYongin-siGyeonggi-do 17104Republic of Korea Department of KHU-KIST Convergence Science and Technology Kyung Hee University23Kyunghee-daero Dongdaemun-guSeoul 02447Republic of Korea

Oxygen redox is considered a new paradigm for increasing the practical capacity and energy density of the layered oxide cathodes for Na-ion batteries. However, severe local structural changes and phase transitions during anionic redox reactions lead to poor electrochemical performance with sluggish ***, we propose a synergy of Li-Cu cations in harnessing the full potential of oxygen redox, through Li displacement and suppressed phase transition in P3-type layered oxide cathode. P3-type Na_(0.7)[Li_(0.1)Cu_(0.2)Mn_(0.7)]O_(2) cathode delivers a large specific capacity of ~212 mA h g^(-1)at 15 mA g^(-1). The discharge capacity is maintained up to ~90% of the initial capacity after 100 cycles, with stable occurrence of the oxygen redox in the high-voltage region. Through advanced experimental analyses and first-principles calculations, it is confirmed that a stepwise redox reaction based on Cu and O ions occurs for the charge-compensation mechanism upon charging. Based on a concrete understanding of the reaction mechanism, the Li displacement by the synergy of Li-Cu cations plays a crucial role in suppressing the structural change of the P3-type layered material under the oxygen redox reaction, and it is expected to be an effective strategy for stabilizing the oxygen redox in the layered oxides of Na-ion batteries.

关键词： Layered oxide cathode Oxygen redox reaction Structural stability Li displacement No phase transition

Intraocular medulloepithelioma in children: clinicopathologic features itself hardly differentiate it from retinoblastoma

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International Journal of Ophthalmology(English edition) 2019年第7期12卷 1227-1230页

作者： jinho Lee Ho-Kyung Choung Young A kim Namju kim Sang In Khwarg Department of Ophthalmology Seoul National University College of Medicine Seoul 03080 Korea Department of Ophthalmology Seoul National University Hospital Seoul 03080 Korea Department of Ophthalmology Seoul Metropolitan Government-Seoul National University Boramae Medical Center Seoul 07061 Korea Department of Pathology Seoul Metropolitan Government-Seoul National University Boramae Medical Center Seoul 07061 Korea Department of Ophthalmology Seoul National University Bundang Hospital Seongnam 13620 Korea

Dear Editor,Iam Di: jinho Lee from the Department of Ophthalmology, Seoul National University Hospital, Seoul, Korea. I am writing to present five case series of intraocular medulloepithelioma. Medulloepitheliomas are the second most common type of pediatric intraocular tumors. They display clinical characteristics similar to retinoblastomas, such as leukocorias and intraocular endophytic masses, and are extremely difficult to clinically differentiate from retinoblastomas.

关键词： retinoblastoma medulloepithelioma pediatric intraocular tumors