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  1. AU=Kim Joo Seop
  2. AU="Mortensen, Jennifer L"
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  1. Article: Effects of the Crystalline Properties of Hollow Ceria Nanostructures on a CuO-CeO

    Jang, Se-Jin / Lee, Hyeonkyeong / Kim, Jiyull / Kim, Na-Yeon / Choi, Dong-Seop / Joo, Ji Bong

    Materials (Basel, Switzerland)

    2022  Volume 15, Issue 11

    Abstract: The development of an efficient and economic catalyst with high catalytic performance is always challenging. In this study, we report the synthesis of hollow ... ...

    Abstract The development of an efficient and economic catalyst with high catalytic performance is always challenging. In this study, we report the synthesis of hollow CeO
    Language English
    Publishing date 2022-05-28
    Publishing country Switzerland
    Document type Journal Article
    ZDB-ID 2487261-1
    ISSN 1996-1944
    ISSN 1996-1944
    DOI 10.3390/ma15113859
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  2. Article ; Online: Material-agnostic machine learning approach enables high relative density in powder bed fusion products.

    Wang, Jaemin / Jeong, Sang Guk / Kim, Eun Seong / Kim, Hyoung Seop / Lee, Byeong-Joo

    Nature communications

    2023  Volume 14, Issue 1, Page(s) 6557

    Abstract: This study introduces a method that is applicable across various powder materials to predict process conditions that yield a product with a relative density greater than 98% by laser powder bed fusion. We develop an XGBoost model using a dataset ... ...

    Abstract This study introduces a method that is applicable across various powder materials to predict process conditions that yield a product with a relative density greater than 98% by laser powder bed fusion. We develop an XGBoost model using a dataset comprising material properties of powder and process conditions, and its output, relative density, undergoes a transformation using a sigmoid function to increase accuracy. We deeply examine the relationships between input features and the target value using Shapley additive explanations. Experimental validation with stainless steel 316 L, AlSi10Mg, and Fe60Co15Ni15Cr10 medium entropy alloy powders verifies the method's reproducibility and transferability. This research contributes to laser powder bed fusion additive manufacturing by offering a universally applicable strategy to optimize process conditions.
    Language English
    Publishing date 2023-10-17
    Publishing country England
    Document type Journal Article
    ZDB-ID 2553671-0
    ISSN 2041-1723 ; 2041-1723
    ISSN (online) 2041-1723
    ISSN 2041-1723
    DOI 10.1038/s41467-023-42319-x
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  3. Article ; Online: Corrections to "Selective Cell-Cell Adhesion Regulation via Cyclic Mechanical Deformation Induced by Ultrafast Nanovibrations".

    Son, Young Ju / Keum, Changjoon / Kim, Minsoo / Jeong, Goeen / Jin, Soyeong / Hwang, Hae Won / Kim, Hyewon / Lee, Kyungwoo / Jeon, Hojeong / Kim, Hojun / Pahk, Ki Joo / Jang, Ho Won / Sun, Jeong-Yun / Han, Hyung-Seop / Lee, Kwan Hyi / Ok, Myoung-Ryul / Kim, Yu-Chan / Jeong, Youngdo

    ACS applied materials & interfaces

    2024  Volume 16, Issue 6, Page(s) 8198

    Language English
    Publishing date 2024-01-31
    Publishing country United States
    Document type Published Erratum
    ISSN 1944-8252
    ISSN (online) 1944-8252
    DOI 10.1021/acsami.4c00948
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  4. Article: Systemic exposure to propranolol in patients with chronic liver disease and its correlation with portal blood flow.

    Kim, Tae-Eun / Kang, Ju-Seop / An, Wen / Sohn, Joo Hyun

    Frontiers in medicine

    2022  Volume 9, Page(s) 973606

    Abstract: Propranolol is a beta-blocker used for the prevention of variceal bleeding in cirrhotic patients. We investigated the pharmacokinetics of propranolol in patients with chronic liver disease compared to that in healthy individuals. The relative amount of ... ...

    Abstract Propranolol is a beta-blocker used for the prevention of variceal bleeding in cirrhotic patients. We investigated the pharmacokinetics of propranolol in patients with chronic liver disease compared to that in healthy individuals. The relative amount of portal blood flow was measured to investigate the correlation of portal blood flow and the systemic exposure of propranolol. Thirty healthy subjects, 18 patients with chronic active hepatitis (CAH), and 54 patients with cirrhosis were included in this prospective study. Blood samples for pharmacokinetic analysis were taken up to 8 h post-dose. The portal blood flow was estimated by H/L ratio using thallium-201 (
    Language English
    Publishing date 2022-09-21
    Publishing country Switzerland
    Document type Journal Article
    ZDB-ID 2775999-4
    ISSN 2296-858X
    ISSN 2296-858X
    DOI 10.3389/fmed.2022.973606
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  5. Article ; Online: Mechanically Robust Self-Organized Crack-Free Nanocellular Graphene with Outstanding Electrochemical Properties in Sodium Ion Battery.

    Park, Wong-Young / Han, Jiuhui / Moon, Jongun / Joo, Soo-Hyun / Wada, Takeshi / Ichikawa, Yuji / Ogawa, Kazuhiro / Kim, Hyoung Seop / Chen, Mingwei / Kato, Hidemi

    Advanced materials (Deerfield Beach, Fla.)

    2024  , Page(s) e2311792

    Abstract: Crack-free nanocellular graphenes are attractive materials with extraordinary mechanical and electrochemical properties, but their homogeneous synthesis on the centimeter scale is challenging. Here, a strong nanocellular graphene film achieved by the ... ...

    Abstract Crack-free nanocellular graphenes are attractive materials with extraordinary mechanical and electrochemical properties, but their homogeneous synthesis on the centimeter scale is challenging. Here, a strong nanocellular graphene film achieved by the self-organization of carbon atoms using liquid metal dealloying and employing a defect-free amorphous precursor is reported. This study demonstrates that a Bi melt strongly catalyzes the self-structuring of graphene layers at low processing temperatures. The robust nanoarchitectured graphene displays a high-genus seamless framework and exhibits remarkable tensile strength (34.8 MPa) and high electrical conductivity (1.6 × 10
    Language English
    Publishing date 2024-02-09
    Publishing country Germany
    Document type Journal Article
    ZDB-ID 1474949-X
    ISSN 1521-4095 ; 0935-9648
    ISSN (online) 1521-4095
    ISSN 0935-9648
    DOI 10.1002/adma.202311792
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  6. Article ; Online: Effects of Operating Parameters and Feed Gas Compositions on the Dry Reforming of Methane over the Ni/Al 2 O 3 Catalyst

    Eunju Yoo / Dong-Seop Choi / Jiyull Kim / Yoon-Hee Kim / Na-Yeon Kim / Ji Bong Joo

    Catalysts, Vol 13, Iss 602, p

    2023  Volume 602

    Abstract: The effects of operating parameters such as reaction temperature, space velocity, and feed gas composition on the performance of the methane dry-reforming reaction (DRM) over the Ni/Al 2 O 3 catalyst are systemically investigated. The Ni/Al 2 O 3 ... ...

    Abstract The effects of operating parameters such as reaction temperature, space velocity, and feed gas composition on the performance of the methane dry-reforming reaction (DRM) over the Ni/Al 2 O 3 catalyst are systemically investigated. The Ni/Al 2 O 3 catalyst, which is synthesized by conventional wet impregnation, showed well-developed mesoporosity with well-dispersed Ni nanoparticles. CH 4 and CO 2 conversions over the Ni/Al 2 O 3 catalyst are dramatically increased as both the reaction temperature is increased, and space velocity is decreased. The feed gas composition, especially the CO 2 /CH 4 ratio, significantly influences the DRM performance, catalyst deactivation and the reaction behavior of side reactions. When the CO 2 -rich gas composition (CO 2 /CH 4 > 1) was used, a reverse water gas shift (RWGS) reaction significantly occurred, leading to the consumption of hydrogen produced from DRM. The CH 4 -rich gas composition (CO 2 /CH 4 < 1) induces severe carbon depositions followed by a reverse Boudouard reaction, resulting in catalytic activity drastically decreasing at the beginning followed by a stable conversion. The catalyst after the DRM reaction with a different feed ratio was analyzed to investigate the amount and structure of carbon deposited on the catalyst. In this study, we suggested that the optimal DRM reaction conditions can achieve stable performances in terms of conversion, hydrogen production and long-term stability.
    Keywords dry reforming ; operation parameter ; carbon deposition ; Chemical technology ; TP1-1185 ; Chemistry ; QD1-999
    Subject code 290
    Language English
    Publishing date 2023-03-01T00:00:00Z
    Publisher MDPI AG
    Document type Article ; Online
    Database BASE - Bielefeld Academic Search Engine (life sciences selection)

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  7. Article ; Online: Surface Properties of CVD-Grown Graphene Transferred by Wet and Dry Transfer Processes.

    Yoon, Min-Ah / Kim, Chan / Kim, Jae-Hyun / Lee, Hak-Joo / Kim, Kwang-Seop

    Sensors (Basel, Switzerland)

    2022  Volume 22, Issue 10

    Abstract: Graphene, an atomically thin material, has unique electrical, mechanical, and optical properties that can enhance the performance of thin film-based flexible and transparent devices, including gas sensors. Graphene synthesized on a metallic catalyst must ...

    Abstract Graphene, an atomically thin material, has unique electrical, mechanical, and optical properties that can enhance the performance of thin film-based flexible and transparent devices, including gas sensors. Graphene synthesized on a metallic catalyst must first be transferred onto a target substrate using wet or dry transfer processes; however, the graphene surface is susceptible to chemical modification and mechanical damage during the transfer. Defects on the graphene surface deteriorate its excellent intrinsic properties, thus reducing device performance. In this study, the surface properties of transferred graphene were investigated according to the transfer method (wet vs. dry) and characterized using atomic force microscopy, Raman spectroscopy, and contact angle measurements. After the wet transfer process, the surface properties of graphene exhibited tendencies similar to the poly(methyl methacrylate) residue remaining after solvent etching. The dry-transferred graphene revealed a surface closer to that of pristine graphene, regardless of substrates. These results provide insight into the utilization of wet and dry transfer processes for various graphene applications.
    Language English
    Publishing date 2022-05-23
    Publishing country Switzerland
    Document type Journal Article
    ZDB-ID 2052857-7
    ISSN 1424-8220 ; 1424-8220
    ISSN (online) 1424-8220
    ISSN 1424-8220
    DOI 10.3390/s22103944
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  8. Article: Selective-Area Growth Mechanism of GaN Microrods on a Plateau Patterned Substrate.

    Ahn, Min-Joo / Jeong, Woo-Seop / Shim, Kyu-Yeon / Kang, Seongho / Kim, Hwayoung / Kim, Dae-Sik / Jhin, Junggeun / Kim, Jaekyun / Byun, Dongjin

    Materials (Basel, Switzerland)

    2023  Volume 16, Issue 6

    Abstract: This study provides experimental evidence regarding the mechanism of gallium nitride (GaN) selective-area growth (SAG) on a polished plateau-patterned sapphire substrate (PP-PSS), on which aluminum nitride (AlN) buffer layers are deposited under the same ...

    Abstract This study provides experimental evidence regarding the mechanism of gallium nitride (GaN) selective-area growth (SAG) on a polished plateau-patterned sapphire substrate (PP-PSS), on which aluminum nitride (AlN) buffer layers are deposited under the same deposition conditions. The SAG of GaN was only observed on the plateau region of the PP-PSS, irrespective of the number of growth cycles. Indirect samples deposited on the bare c-plane substrate were prepared to determine the difference between the AlN buffer layers in the plateau region and silicon oxide (SiO2). The AlN buffer layer in the plateau region exhibited a higher surface energy, and its crystal orientation is indicated by AlN [001]. In contrast, regions other than the plateau region did not exhibit crystallinity and presented lower surface energies. The direct analysis results of PP-PSS using transmission electron microscopy (TEM) and electron backscattered diffraction (EBSD) are similar to the results of the indirect samples. Therefore, under the same conditions, the GaN SAG of the deposited layer is related to crystallinity, crystal orientation, and surface energy.
    Language English
    Publishing date 2023-03-20
    Publishing country Switzerland
    Document type Journal Article
    ZDB-ID 2487261-1
    ISSN 1996-1944
    ISSN 1996-1944
    DOI 10.3390/ma16062462
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  9. Article ; Online: Bucket Size Optimization for Metering Device in Garlic Planter Using Discrete Element Method

    Dongu Im / Ho-Seop Lee / Jae-Hyun Kim / Dong-Joo Moon / Tae-Ick Moon / Seung-Hwa Yu / Young-Jun Park

    Agriculture, Vol 13, Iss 1199, p

    2023  Volume 1199

    Abstract: In this study, the discrete element method was used to optimize the bucket size for the metering device in a garlic planter for enhancing the productivity of garlic farming according to the garlic size. Statistical information concerning the actual shape ...

    Abstract In this study, the discrete element method was used to optimize the bucket size for the metering device in a garlic planter for enhancing the productivity of garlic farming according to the garlic size. Statistical information concerning the actual shape of garlic cloves was incorporated, and the mechanical properties of garlic were determined using the bulk density, sliding test, and repose angle test for enhancing the fidelity of the simulation model. The optimal bucket size achieving the target plant rate of 97.5% was determined using the developed discrete element model for the three garlic size groups. The linear search method was used for optimization, and batch simulation was performed to validate the optimized results and confirm the performance index of the metering device. A Gaussian distribution based on statistical information accounted for the various garlic sizes in each group. Finally, a metering test verified the reliability of the optimization technique. The differences between the simulation and test results were within 10% for all performance indices, including missing plant rate, multi-plant rate, and planting rate, indicating the high reliability of the analysis model. Subsequently, the larger garlic groups (Groups 2 and 3) exhibited metering performance close to the target plant rate.
    Keywords garlic planter ; metering device ; size optimization ; discrete element method ; Agriculture (General) ; S1-972
    Subject code 600
    Language English
    Publishing date 2023-06-01T00:00:00Z
    Publisher MDPI AG
    Document type Article ; Online
    Database BASE - Bielefeld Academic Search Engine (life sciences selection)

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  10. Article ; Online: Heat-induced RING/U-BOX E3 ligase, TaUHS, is a negative regulator by facilitating TaLSD degradation during the grain filling period in wheat

    Ko, Chan Seop / Kim, Dae Yeon / Lee, Joo Sun / Kim, Jin-Baek / Hong, Min Jeong / Seo, Yong Weon

    Plant Growth Regul. 2023 Mar., v. 99, no. 2 p.251-264

    2023  

    Abstract: Heat stress accelerates abnormal maturation and leads to numerous defects in wheat. Temperature determines the duration of plant growth and heat stress accelerates crop development, resulting in premature initiation of phenological stages. The grain ... ...

    Abstract Heat stress accelerates abnormal maturation and leads to numerous defects in wheat. Temperature determines the duration of plant growth and heat stress accelerates crop development, resulting in premature initiation of phenological stages. The grain filling period is sensitive and is easily exposed to heat stress, which reduces the grain weight and shortens the period. In this study, from anthesis through early spike maturity, we observed decreased grain weight and accelerated maturation under heat stress, resulting in poor grain development. Furthermore, the maturation of spikes was accelerated to shorten the grain filling and ripening periods under high temperatures. Triticum aestivum L. UBOX responding Heat Stress gene (TaUHS) (TraesCS1D02G145900, UBOX response heat stress) was highly expressed in grains located at the basal positions of the spike under high-temperature stress. TaUHS is an E3 ligase found in the nucleus and plasma membrane. We demonstrated that TaUHS interacts with Triticum aestivum L. LEA containing seed development gene (TaLSD) (TraesCS5A02G385600, LEA-containing seed development). TaLSD, which played stress resistance and desiccation tolerance at grain filling period, mediates ubiquitination and proteasomal degradation by 26S proteasome with TaUHS under high-temperature conditions. Proteolysis of TaLSD in conjugate with E3 ligase might occur to maintain cellular homeostasis and stability in response to unfavorable environmental conditions. Wheat RING/U-BOX E3 ligase negatively regulates late embryogenesis-abundant proteins during the grain filling period under heat stress.
    Keywords Triticum aestivum ; drought tolerance ; flowering ; genes ; heat stress ; homeostasis ; phenology ; plant growth ; plasma membrane ; proteasome endopeptidase complex ; proteolysis ; seed development ; stress tolerance ; temperature ; ubiquitin-protein ligase ; ubiquitination ; wheat
    Language English
    Dates of publication 2023-03
    Size p. 251-264.
    Publishing place Springer Netherlands
    Document type Article ; Online
    ZDB-ID 843025-1
    ISSN 1573-5087 ; 0167-6903
    ISSN (online) 1573-5087
    ISSN 0167-6903
    DOI 10.1007/s10725-022-00902-0
    Database NAL-Catalogue (AGRICOLA)

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