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Bone Research 2023年第2期11卷 354-367页

作者： Eun Jung Lee Kyoung Jin Lee Seungpil Jung Kyong Hwa park Serk In park Department of Biochemistry and Molecular Biology Korea University College of MedicineSeoulRepublic of Korea The BK21 Graduate Program Department of Biomedical SciencesKorea University College of MedicineSeoulRepublic of Korea Division of Breast and Endocrine Surgery Department of SurgeryKorea University Anam HospitalSeoulRepublic of Korea Division of Oncology and Hematology Department of Internal MedicineKorea University Anam HospitalSeoulRepublic of Korea Vanderbilt center for Bone Biology Vanderbilt University School of MedicineNashvilleTNUSA

Myeloid-derived suppressor cells(MDScs)are bone marrow(BM)-derived immunosuppressive cells in the tumor microenvironment,but the mechanism of MDSc mobilization from the BM remains *** investigated how BM stromal cell activation by PTH1R contributes to MDSc ***1R activation by parathyroid hormone(PTH)or PTH-related peptide(PTHrP),a tumor-derived c.unterpart,mobilized monocytic(M-)MDScs from murine BM without increasing immunosuppressive *** vitro cell-binding assays demonstrated thatα4β1 integrin and vascular cell adhesion molecule(VcAM)-1,expressed on M-MDScs and osteoblasts,respectively,are key to M-MDSc binding to *** PTH1R activation,osteoblasts express VEGF-A and IL6,leading to Src family kinase phosphorylation in *** inhibitors suppressed PTHrP-induced MDSc mobilization,and Src activation in M-MDScs upregulated two proteases,ADAM-17 and MMP7,leading to VcAM1 shedding and subsequent disruption of M-MDSc tethering to ***,our data provide the molecular mechanism of M-MDSc mobilization in the bones of tumor hosts.

关键词： MMP7 suppressor regulated

characterizing and Mitigating chemomechanical Degradation in High-Energy Lithium-Ion Battery cathode Materials

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Acc.unts of Materials Research 2022年第5期3卷 511-524页

作者： Norman S.Luu Kyu-Young park Mark c.Hersam Department of Materials Science and Engineering Northwestern UniversityEvanstonIllinois 60208United States Graduate Institute of Ferrous and Energy Materials Technology Pohang University of Science and TechnologyPohangKyungbuk 37673Republic of Korea Department of chemistry and Department of Electrical and computer Engineering Northwestern UniversityEvanstonIllinois 60208United

Lithium-ion batteries(LIBs)are nearly ubiquitous energy storage solutions,powering devices ranging from consumer electronics to electric *** advance these applications,current LIB research efforts are directed toward improving energy and power densities,cyclic lifetimes,charging speeds,and *** parameters are intrinsically tied to properties of the active electrode materials,such as the redox mechanism,chemical composition,and crystal *** particularly challenging issue is that the active electrode materials that possess higher theoretical energy densities are generally more susceptible to degradation during cycling.A notable example is the family of layered multicomponent transition metal oxides,which is the incumbent class of active LIB cathode materials for electric *** increase their theoretical capacities,the transition metal fraction in these materials is trending toward higher Ni ***,Ni-rich chemistries suffer from electrochemical,crystallographic,and mechanical degradation that increase in severity with increasing Ni ***,alternative high-energy cathode materials,including overlithiated layered oxides and disordered rock salt materials,present additional stability challenges that must be overcome before they can be realistically incorporated into LIB *** chemomechanical degradation in high-energy LIB cathode materials occurs at multiple length *** defects,such as antisite defects or vacancies,are commonly generated during electrochemical cycling and can contribute to the loss of cyclable active *** both the primary and secondary particle level,electrochemical cycling also induces significant volumetric changes and state-of-charge heterogeneity,generating regions of high stress and strain that are precursors to mechanical ***,at the electrode level,nonuniform charge transfer reactions throughout the electrode can lead to locally overcharged regions that become

关键词： Battery electrode cycling

Biomass-derived bifunctional electrocatalysts for oxygen reduction and evolution reaction: A review

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Journal of Energy chemistry 2022年第2期31卷 149-172页

作者： Satpal Singh Sekhon Jaeyoung Lee Jin-Soo park Future Environment and Energy Research Institute Sangmyung UniversityCheonan 31066Republic of Korea Department of Physics Guru Nanak Dev UniversityAmritsar 143005India Ertl center for Electrochemistry and catalysis Gwangju Institute of Science and Technology123 Cheomdangwagi-roBuk-guGwangju 61005Republic of Korea Department of Green chemical Engineering College of EngineeringSangmyung UniversityCheonan 31066Republic of Korea

Oxygen electrode catalysts are important as inter-conversion of O_(2) and H_(2)O is crucial for energy ***,the sluggish kinetics of oxygen reduction and evolution reactions(ORR and OER)are a hindrance to their scalable production,whereas scarce and costly Pt and Ir/Ru-based catalysts with the highest electrocatalytic activity are commercially *** good ORR catalysts are not always efficient for OER and vice versa,so bifunctional catalysts on which OER and ORR occurs on the same electrode are very *** catalysts based on heteroatom-doped carbon nanomaterials,though showed good electrocatalytic activity yet their high cost and complex synthesis is not viable for scalable *** overcome these drawbacks,biomass-derived heteroatom-doped porous carbons have recently emerged as low-cost,earth-abundant,renewable and sustainable environment-friendly materials for bifunctional oxygen *** tunable morphology,mesoporous structure and high concentration of catalytic active sites of these materials due to heteroatom(N)-doping could further enhance their ORR and OER activity,along with tolerance to methanol crossover and good ***,biomassderived heteroatom-doped porous carbons with large surface area,rich edge defects,numerous micropores and thin 2 D nanoarchitecture could be suitable as efficient bifunctional oxygen *** the present article,synthesis,N-doping,ORR/OER mechanism and electrocatalytic performance of biomassderived bifunctional catalysts has been *** selected biomass(chitin,eggs,euonymus japonicas,tobacco,lysine and plant residue)except wood,act as both c and N precursor,resulting in N selfdoping of porous carbons that avoids the use of toxic chemicals,thus making the synthesis a facile and environment-friendly green *** synthetic strategy could be further optimized to develop future biomass-based N self-doped porous carbons as metal-free high performance bifunctional oxy

关键词： Bifunctional catalysts Biomass ORR OER N-doping Porous carbons

Precise control of surface oxygen vacancies in ZnO nanoparticles for extremely high acetone sensing response

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Journal of Advanced ceramics 2022年第5期11卷 769-783页

作者： Jihyun LEE Youngmoon cHOI Byoung Joon park Jeong Woo HAN Hyun-Sook LEE Jong Hyeok park Wooyoung LEE Department of Materials Science and Engineering Yonsei UniversitySeoul 03722Republic of Korea Department of chemical and Biological Engineering Yonsei UniversitySeoul 03722Republic of Korea Department of chemical Engineering Pohang University of Science and TechnologyPohang 37673Republic of Korea Institute for convergence Research and Education in Advanced Technology Yonsei UniversitySeoul 03722Republic of Korea

ZnO has been studied intensely for chemical sensors due to its high sensitivity and fast ***,we present a simple approach to precisely control oxygen vacancy contents to provide significantly enhanced acetone sensing performance of commercial ZnO nanopowders.A combination of H_(2)O_(2)treatment and thermal annealing produces optimal surface defects with oxygen vacancies on the ZnO nanoparticles(NPs).The highest response of~27,562 was achieved for 10 ppm acetone in 0.125 MH_(2)O_(2)treated/annealed ZnO NPs at the optimal working temperature of 400℃,which is significantly higher than that of reported so far in various acetone sensors based on metal oxide semiconductors(MOSs).Furthermore,first-principles calculations indicate that pre-adsorbed O formed on the surface of H_(2)O_(2)treated ZnO NPs can provide favorable adsorption energy,especially for acetone detection,due to strong bidentate bonding between carbonyl c atom of acetone molecules and pre-adsorbed O on the ZnO *** study demonstrates that controlling surface oxygen vacancies by H_(2)O_(2)treatment and re-annealing at optimal temperature is an effective method to improve the sensing properties of commercial MOS materials.

关键词： gas sensors acetone metal oxide semiconductors(MOSs) ZnO nanoparticles(NPs) H_(2)O_(2)treatment

A feasible route to produce 1.1 GPa ferritic-based low-Mn lightweight steels with ductility of 47%

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Journal of Materials Science & Technology 2022年第22期117卷 225-237页

作者： Kwang Kyu Ko Hyo Ju Bae Eun Hye park Hyeon-Uk Jeong Hyoung Seok park Jae Seok Jeong Jung Gi Kim Hyokyung Sung Nokeun park Jae Bok Seol Department of Materials Engineering and convergence Technology Center for K-metalGyeongsang National University(GNU)Jinju 52828South Korea School of Materials Science and Engineering Yeungnam UniversityGyeongbuk 38541South Korea Materials Research Team R&D Hyundai MobisYongin 16891South Korea Materials Technology Development Team Doosan Heavy Industries&ConstructionChangwon 51711South Korea

High- and medium-Mn (H/M-Mn) base lightweight steels are a class of ultrastrong structural materials with high ductility compared to their low-Mn c.unterparts with low strength and poor ***, producing these H/M-Mn materials requires the advanced or high-tech manufacturing techniques, which can unavoidably provoke labor and cost concerns. Herein, we have developed a facilestrategy that circumvents the strength–ductility trade-off in low-Mn ferritic lightweight steels, by employing low-temperature tempering-induced partitioning (LTP). This LTP treatment affords a typical Fe-2.8Mn-5.7Al-0.3c (wt.%) steel with a heterogeneous size-distribution of metastable austenite embeddedin a ferrite matrix for partitioning more carbon into smaller austenite grains than into the larger austenite ones. This size-dependent partitioning results in slip plane spacing modification and lattice strain,which act through dislocation engineering. We ascribe the simultaneous improvement in strength andtotal elongation to both the size-dependent dislocation movement in austenite grains and the controlleddeformation-induced martensitic transformation. The low-carbon-partitioned large austenite grains increase the strength and ductility as a consequence of the combined martensitic transformation andhigh dislocation density-induced hardening and by interface strengthening. Additionally, high-carbonpartitioned small austenite grains enhance the strength and ductility by planar dislocation glide (inthe low strain regime) and by cross-slipping and delayed martensitic transformation (in the high strainregime). The concept of size-dependent dislocation engineering may provide different pathways for developing a wide range of heterogeneous-structured low-Mn lightweight steels, suggesting that LTP maybe desirable for broad industrial applications at an economic cost.

关键词： Low-Mn lightweight steel carbon partitioning Metastable austenite Dislocation movement

Ransomware classification Framework Using the Behavioral Performance Visualization of Execution Objects

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computers, Materials & continua 2022年第8期72卷 3401-3424页

作者： Jun-Seob Kim Ki-Woong park Department of computer and Information Security and Convergence Engineering for Intelligent DroneSejong UniversitySeoul05006Korea

A ransomware attack that interrupted the operation of colonial Pipeline(a large *** pipeline company),showed that security threats by malware have become serious enough to affect industries and social infrastructure rather than individuals *** agents and characteristics of attacks should be identified,and appropriate strategies should be established accordingly in order to respond to such *** this purpose,the first task that must be performed is malware *** creators are well aware of this and apply various concealment and avoidance techniques,making it difficult to classify *** study focuses on new features and classification techniques to overcome these *** propose a behavioral performance visualization method using utilization patterns of system resources,such as the central processing unit,memory,and input/output,that are commonly used in performance analysis or tuning of *** extracted the usage patterns of the system resources for ransomware to performbehavioral performance *** results of the classification performance evaluation using the visualization results indicate an accuracy of at least 98.94%with a 3.69%loss ***,we designed and implemented a framework to perform the entire process—from data extraction to behavioral performance visualization and classification performance measurement—that is expected to contribute to related studies in the future.

关键词： Behavioral performance visualization ransomware malware classification

Sequential transcatheter arterial chemoembolization and portal vein embolization before right hemihepatectomy in patients with hepatocellular carcinoma

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Hepatobiliary & Pancreatic Diseases International 2020年第3期19卷 244-251页

作者： Gil c.un park Sung Gyu Lee Young In Yoon Kyu Bo Sung Gi Young Ko Dong Il gwon Dong Hwan Jung Yong Kyu Jung Division of Hepatobiliary Surgery and Liver Transplantation Department of SurgeryAsan Medical CenterUniversity of Ulsan College of MedicineSeoulKorea Department of Radiology and Research Institute of Radiology Asan Medical CenterUniversity of Ulsan College of MedicineSeoulKorea

Background:Recent studies showed that sequential selective transcatheter arterial chemoembolization(TAcE)and portal vein embolization(PVE)provided better future liver remnant(FLR)regeneration rate and disease-free survival following surgery compared with PVE *** present study aimed to clarify whether preoperative sequential TAcE and PVE before right hemihepatectomy can reduce postoperative hepatocellular carcinoma(Hcc)recurrence and improve long-term disease-free and overall ***:Recurrence and survival outcomes were retrospectively evaluated in 205 patients with Hcc who underwent right hemihepatectomy by a single surgeon from November 1993 to November *** were divided into four groups according to the procedure performed before the surgery:sequential TAcE and PVE(TAcE-PVE),PVE-only,TAcE-only,or na?ve control *** baseline patient and tumor characteristics,postoperative outcomes,recurrence-free survival and overall survival were ***:Baseline patient and tumor characteristics upon diagnosis were similar in all four groups,while sequential TAcE and PVE were well *** TAcE-PVE group had a higher mean increase in percentage FLR volume compared with that of the PVE-only group(17.46%±6.63%vs.12.14%±5.93%;P=0.001).The TAcE-PVE group had significantly better overall and disease-free survival rates compared with the other groups(both Pconclusions:Sequential TAcE and PVE prior to surgery can be an effective therapeutic strategy for patients with Hcc scheduled for major hepatic *** active application of preoperative sequential TAcE and PVE for Hcc would allow more patients with marginal FLR volume to become candidates for major hepatic resection by promoting compensatory FLR hypertrophy without the deterioration of basal hepatic functional reserve or tumor progression.

关键词： Sequential selective transcatheter Arterial chemoembolization Portal vein embolization Hepatocellular carcinoma Future liver remnant

X-ray volumetric quantitative phase imaging by Foucault differential filtering with linear scanning

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chinese Optics Letters 2023年第1期21卷 120-124页

作者： Young-Sung park Jieun Hong Jaeho choi Photonics Laboratory Department of PhysicsDankook UniversityCheonan 31116Republic of Korea center for Basic Science Research at DKU Dankook UniversityCheonan 31116Republic of Korea

Non-interferometric X-ray quantitative phase imaging(XQPI),much simpler than the interferometric scheme,has provided high-resolution and reliable phase-contrast *** report on implementing the volumetric XQPI images using concurrent-bidirectional scanning of the orthogonal plane on the optical axis of the Foucault differential filter;we then extracted data in conjunction with the transport-intensity *** volumetric image of the laminate microstructure of the gills of a fish was successfully reconstructed to demonstrate our XQPI *** method can perform 3D rendering without any rotational motion for laterally extended objects by manipulating incoherent X-rays using the pinhole array.

关键词： X-ray imaging phase contrast imaging Foucault differential filter transport-intensity equation

Improved continuous precipitation kinetics and tensile properties of extruded AZ80 alloy through {10-12} twin formation

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Journal of Magnesium and Alloys 2023年第9期11卷 3323-3337页

作者： Hyun Ji Kim Sumi Jo Sung Hyuk park Department of Materials Science and Metallurgical Engineering Kyungpook National UniversityDaegu 41566the Republic of Korea

This study investigates the effect of {10-12} deformation twins on the continuous precipitation behavior of an extruded Mg-8.0Al-0.5Zn-0.2Mn(AZ80) alloy during aging. The extruded AZ80 alloy is compressed along the transverse direction to introduce {10-12} twins,followed by an aging treatment at 300 ℃. The extruded material exhibits a twin-free microstructure with low internal strain energy, whereas the pre-twinned material possesses abundant {10-12} twins and has high internal strain energy. The aging results reveal that the peak-aging time of the pre-twinned material(1 h) is one-eighth of that of the extruded material(8 h). Although Mg_(17)Al_(12) continuous precipitates(cPs)are observed in both the peak-aged materials, these cPs are much smaller and more densely distributed in the pre-twinned material despite the significantly shorter aging time. The cPs size in the peak-aged materials increases in the following order: twinned region in the pre-twinned material(0.47 μm) cPs number density in the twinned region of the pre-twinned material is approximately 11 times higher than that in the matrix region of the extruded material. The peak-aged pre-twinned material exhibits significantly higher tensile strength and ductility than the peak-aged extruded material. These results demonstrate that the formation of {10-12} twins in the extruded AZ80 alloy substantially accelerates the static precipitation of cPs during aging at 300 ℃ and improves the tensile properties of the peak-aged material.

关键词： AZ80 alloy {10-12}twin Aging continuous precipitation Tensile properties

Rational design of ultrafine FeSe_(2) nanocrystals emb e dde d within hollow mesoporous carbon bowls for potassium-ion batteries with long-term cycling stability and high volumetric capacity

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Journal of Materials Science & Technology 2023年第12期143卷 129-139页

作者： Yu Jin Jang Hong Geun Oh Seung-Keun park Department of Advanced Materials Engineering Chung-Ang University4726Seodong-daeroDaedeok-myeonAnseong-siGyeonggi-do 17546Republic of Korea

Hollow structures are commonly used to alleviate the mechanical stress on electrode materials and to provide more active sites in potassium-ion batteries(KIBs).Nevertheless,the excessive internal voids within these structures significantly reduce the packing density of particles,resulting in a relatively low volumetric energy density of the fabricated electrodes,which is undesirable for practical *** designed a hollow mesoporous carbon bowl embedded with ultrafine bis(selanylidene)iron(FeSe 2)nanocrystals(FeSe 2@HMcB)via a controllable impregnation method and subsequent selenization pro-cess for high-performance *** as-obtained FeSe 2@HMcB can inherit the advantages of conventional hollow carbon-based composites,such as alleviation of volume variation in active materials,abundant ion storage sites,and high electrical ***,the bowl structure has a higher pack-ing density than the conventional hollow structure,resulting in a significant increase in the volumet-ric energy density of the fabricated *** of these advantages,the FeSe 2@HMcB exhibits a high,stable reversible capacity of 326 mA h g^(-1) even after 1000 cycles at 0.5 A g^(-1),and excellent rate capacities(182 mA h g^(-1) at 3.0 A g^(-1)).compared with the hollow structured c.unterpart,the vol-umetric capacity(mA h cm−3)of FeSe 2@HMcB increased by 60%.Furthermore,a full cell consisting of FeSe 2@HMcB//Prussian blue(PB)exhibits excellent electrochemical performance(99 mA h g^(-1) after 100 cycles at 0.1 A g^(-1)).

关键词： Potassium-ion batteries Iron selenide Bowl-like structure Mesoporous carbon Anode material