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

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 counterparts 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

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Hydrogen spillover in nonreducible oxides:Mechanism and catalytic utilization

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Nano Research 2022年第12期15卷 10357-10365页

作者： Songhyun Lee Hyungjun Kim Ryong Ryoo jeong Young park Minkee Choi Charles D.Davidson School of Chemical Engineering Purdue UniversityWest LafayetteIndiana47907USA Department of Chemical and Biomolecular Engineering Korea Advanced Institute of Science and TechnologyDaejeon34141Republic of Korea Department of Chemistry Korea Advanced Institute of Science and TechnologyDaejeon34141Republic of Korea KENTECH Laboratory for Chemical Environmental and Climate TechnologyKorea Institute of Energy Technology(KENTECH)200 Hyeoksin-roNaju58330Republic of Korea Center for Nanomaterials and Chemical Reactions Institute for Basic Science(IBS)Daejeon34141Republic of Korea

Hydrogen(H)spillover in nonreducible oxides such as zeolites and Al2O3 has been a highly controversial phenomenon in heterogeneous *** industrial catalysts are predominantly prepared using these materials as supports,it is important to understand the mechanism and catalytic functions of H spillover on their *** the past decade,fundamental studies on zeolite-encapsulated metal catalysts have revealed that H spillover and reverse spillover can be utilized in the design of hydrogenation and dehydrogenation catalysts with improved *** experimental and theoretical studies have indicated that H spillover can occur in nonreducible oxides when they possess substantial acid sites that aid the surface migration of active *** the present review,we will discuss the possible mechanisms of H spillover in nonreducible oxides and the unique opportunities of using this phenomenon for the design of advanced hydroprocessing catalysts.

关键词： hydrogen spillover nonreducible oxides zeolites hydroprocessing catalysts

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UBP12/UBP13-mediated deubiquitination of salicylic acid receptor NPR3 suppresses plant immunity

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Molecular Plant 2023年第1期16卷 232-244页

作者： Yu Zhou su-Hyun park Nam-Hai Chua Temasek Life Sciences Laboratory National University of Singapore1 Research LinkSingapore 117604Singapore Disruptive&sustainable Technologies for Agricultural Precision Singapore-MIT Alliance for Research and Technology1 CREATE WaySingapore 138602Singapore

Salicylic acid(SA),a defense hormone produced after pathogen challenge,is critical for plant *** NONEXPRESSER OF PR GENES 1(NPR1)and its paralogs NPR3 and NPR4 can bind SA and mediate SA signal ***1 functions as a transcriptional co-activator to promote defense gene expression,whereas NPR3 and NPR4 have been shown to function as negative regulators in the SA signaling *** the mechanism about NPR1 regulation has been well studied,how NPR3/NPR4 proteins are regulated in immune responses remains largely ***,we show that the stability of NPR3/NPR4 is enhanced by *** the absence of pathogen challenge,NPR3/NPR4 are unstable and degraded by the 26S proteasome,whereas the increase in cellular SA levels upon pathogen infection suppresses NPR3/NPR4 *** found that UBP12 and UBP13,two homologous deubiquitinases from a ubiquitin-specific protease subfamily,negatively regulate plant immunity by promoting NPR3/NPR4 *** genetic results further showed that UBP12/UBP13-mediated immunity suppression is partially dependent on NPR3/NPR4 *** interacting with NPR3 in the nucleus in an SA-dependent manner,UBP12 and UBP13 remove ubiquitin from polyubiquitinated NPR3 to protect it from being *** stabilization of NPR3/NPR4 promoted by UBP12/UBP13 is essential for negative regulation of basal and SA-induced immunity.

关键词： plant immunity salicylic acid NPR3 UBP12/UBP13

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Symptomatic accessory soleus muscle:A cause for exertional compartment syndrome in a young soldier:A case report

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World Journal of Clinical Cases 2022年第35期10卷 13022-13027页

作者： Inha Woo Chul Hyun park Hongfei Yan jeong Jin park Department of Orthopaedic surgery Yeungnam University HospitalDaegu 42492South Korea Department of Orthopaedics Yeungnam University HospitalDaegu 42415South Korea

BACKGROUND Accessory soleus muscle(ASM)is a rare congenital variation that is almost asymptomatic,but several papers have recently described symptomatic *** clinical features of this condition are similar to tarsal tunnel syndrome(TTS)and include pain and numbness around the medial side of the *** commonly originates from the fibula or soleus muscle and inserts into the Achilles tendon or ***,it is identified as posteromedial swelling and definitely diagnosed by magnetic resonance *** most cases,treatment is observation,but surgical excision can be considered if symptoms are *** suMMARY A 23-year-old male Korean soldier presented with complaints of bilateral foot and ankle pain and a swelling medial to the Achilles tendon that was more pronounced on the right *** first occurred after playing soccer 10 mo before this presentation,worsened after physical exertion,and were relieved by *** had no medical history,and no one in his family had the *** results were *** tests were performed to exclude common diseases such as tumors or ***,MRI revealed a bulky accessory soleus muscle in both feet,though the patient complained of more severe pain on the right side during physical ***,surgical resection was *** surgery,a large accessory soleus muscle was noted anterior to the Achilles tendon with distinctive insertion from a normal soleus *** 12 mo after surgery,there was no pain,numbness,or swelling of the right foot or ankle,no evidence of recurrence,and the patient could do all sports *** Accessory soleus muscle should be added to the list of differential diagnosis if a patient has pain,sole numbness or swelling of the posteromedial ankle.

关键词： Accessory soleus muscle Posteromedial ankle pain Exertional compartment syndrome Tarsal tunnel syndrome Sole numbness Case report

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Impregnation approach for poly(vinylidene fluoride)/tin oxide nanotube composites with high tribological performance

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Journal of Materials Science & Technology 2020年第2期37卷 19-25页

作者： Min su park Jin Kyu Kim Tong-Seok Han Jung Tae park Jong Hak Kim Department of Chemical and Biomolecular Engineering Yonsei University50 Yonsei-roSeodaemun-guSeoul03722Korea Department of Civil and Environmental Engineering Yonsei University50 Yonsei-roSeodaemun-guSeoul03722Korea Department of Chemical Engineering Konkuk University120 Neungdong-roGwangjin-guSeoul05029Korea

We report a composite material with the high tribological performance,which consists of onedimensional SnO2 nanotubes(ST)and a high molecular weight poly(vinylidene fluoride)(PVDF)matrix in terms of *** of PVDF in N,N-dimethylformamide(DMF)resulted in a facile penetration of PVDF into the inner hollow voids of ST,leading to the close *** between PVDF and ST results in a beneficial effect on the chain arrangement of PVDF,providing anα-phase with better tribological *** ST incorporation,the friction coefficient decreased by 85.0%to 0.408,and the specific wear rate decreased by 69.1%to 0.412,demonstrating the pivotal role of ST as a self-lubricating material due to a large interactive area and PVDF chain rearrangement.

关键词： SnO2 nanotube Composite Friction coefficient Wear rate

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The role of Eph receptors in lens function and disease

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Science China(Life Sciences) 2012年第5期55卷 434-443页

作者： SON Alexander I. park jeong Eun Department of Chemical Biology Ernest Mario School of PharmacyRutgersThe State University of New Jersey

Cataract is the single largest contributor to blindness in the world,with the disease having a strong genetic *** recent years the Eph family of receptor tyrosine kinases has been identified as a key regulator in lens... 详细信息

关键词： cataract lens EphA2 ephrin-A5

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Material Characterization of Ni Base Alloy for Very High Temperature Reactor

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Journal of Materials Science & Technology 2013年第12期29卷 1184-1190页

作者： Dong-Jin Kim Gyeong-Geun Lee Dae Jong Kim su Jin jeong Nuclear Materials Division Korea Atomic Energy Research Institute

The generation of highly efficient electricity and the production of massive hydrogen are possible using a very high temperature reactor （VHTR） among generation IV nuclear power plants. The structural material for an intermediate heat exchanger （IHX） among numerous components should be endurable at high temperature of up to 950 °C during long-term operation. Impurities inevitably introduced in helium as a coolant facilitate the material degradation by corrosion at high temperature. In the present work, the surface reactions available under controlled impure helium at 950 °C were investigated based on the thermodynamics and the corrosion tests were performed in a temperature range of 850-950 °C during 10-250 h for commercial Alloy 617 as a candidate material for an IHX. Moreover, the mechanical property and microstructure for nickel-based alloys fabricated in laboratory were evaluated as a function of the processing parameters such as hot rolling and heat treatment conditions. From the reaction rate constant obtained from an impure helium control system for a material evaluation, it was predicted that the outer oxide layer thickness, internal oxide depth, and carbide- depleted zone depth reach about 116, 600 and 1000 μm, respectively when Alloy 617 is exposed to an impure helium environment at 950 ~C for 20 years. For Ni-Cr-Co-Mo alloy, subsequent annealing and a combination of cold working and subsequent annealing following solution annealing caused increases in the grain boundary carbide coverage and size. The angular distribution of the grain boundary as well as the carbide distribution was also changed leading to a consequent improvement of the mechanical property at 950 °C in air.

关键词： Nickel base alloy Intermediate heat exchanger High temperature reactor Corrosion Mechanical property

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Recurrent Autoencoder Ensembles for Brake Operating Unit Anomaly Detection on Metro Vehicles

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Computers, Materials & Continua 2022年第10期73卷 1-14页

作者： Jaeyong Kang Chul-su Kim jeong Won Kang jeonghwan Gwak Department of Software Korea National University of TransportationChungju27469Korea School of Railroad Engineering Korea National University of TransportationUiwang16106Korea Graduate School of Transportation Korea National University of TransportationUiwang16106Korea Department of AI Robotics Engineering Korea National University of TransportationChungju27469Korea Department of Biomedical Engineering Korea National University of TransportationChungju27469Korea Department of IT Convergence(Brain Korea PLUS 21) Korea National University of TransportationChungju27469Korea

The anomaly detection of the brake operating unit (BOU) in thebrake systems on metro vehicle is critical for the safety and reliability ofthe trains. On the other hand, current periodic inspection and maintenanceare unable to detect anomalies in an early stage. Also, building an accurateand stable system for detecting anomalies is extremely difficult. Therefore,we present an efficient model that use an ensemble of recurrent autoencodersto accurately detect the BOU abnormalities of metro trains. This is the firstproposal to employ an ensemble deep learning technique to detect BOUabnormalities in metro train braking systems. One of the anomalous caseson metro vehicles is the case when the air cylinder (AC) pressures are less thanthe brake cylinder (BC) pressures in certain parts where the brake pressuresincrease before coming to a halt. Hence, in this work, we first extract the dataof BC and AC pressures. Then, the extracted data of BC and AC pressuresare divided into multiple subsequences that are used as an input for bothbi-directional long short-term memory (biLSTM) and bi-directional gatedrecurrent unit (biGRU) autoencoders. The biLSTM and biGRU autoencodersare trained using training dataset that only contains normal subsequences. Fordetecting abnormalities from test dataset which consists of abnormal subsequences, the mean absolute errors (MAEs) between original subsequences andreconstructed subsequences from both biLSTM and biGRU autoencoders arecalculated. As an ensemble step, the total error is calculated by averaging twoMAEs from biLSTM and biGRU autoencoders. The subsequence with totalerror greater than a pre-defined threshold value is considered an *** carried out the experiments using the BOU dataset on metro vehiclesin South Korea. Experimental results demonstrate that the ensemble modelshows better performance than other autoencoder-based models, which showsthe effectiveness of our ensemble model for detecting BOU anomalies onmetro trains.

关键词： Anomaly detection brake operating unit deep learning machine learning signal processing

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Regular moderate aerobic exercise improves high-fat diet-induced nonalcoholic fatty liver disease via monoacylglycerol O-acyltransferase 1 pathway suppression

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Journal of Sport and Health Science 2020年第5期9卷 472-478页

作者： Kyung-Wan Baek jeong-An Gim Jung-Jun park Division of Sport Science Pusan National UniversityBusan 46241Korea Department of Biological Sciences College of Natural SciencesPusan National UniversityBusan 46241Korea

Purpose:Monoacylglycerol O-acyltransferase 1(MGAT1)is reported to play a key role in the development of diet-induced nonalcoholic fatty liver disease(NAFLD).Thus,this study investigated the effect of exercise on suppression of the MGAT1 pathway in NAFLD tissue of high-fat diet(HFD)-induced obese ***:Male Sprague-Dawley rats were fed an HFD containing 45%fat for 6 *** confirmation that NAFLD had been induced in the obese animals,they were divided into HFD-fed groups provided with exercise(HFD+EXE)or without exercise(HFD)and a group given dietary adjustment(DA)only,for a further 6 weeks of intervention *** 6-week regular moderate aerobic exercise consisted of an accommodation phase with increasing *** accumulation in the liver tissue was determined by Oil Red O *** MGAT1 and liver lipogenic gene mRNA levels were measured by qPCR,and their protein levels by western blot ***:Oil Red O staining showed that NAFLD was successfully induced by *** gene expression of MGAT1 was significantly lower in HFD+EXE than ***,there was no significant difference between HFD+EXE and *** protein expression of MGAT1 was significantly lower in HFD+EXE than both HFD and *** RNA and protein expression of other lipogenic genes were not different among *** data indicate that exercise suppresses MGAT1 pathway regardless of HFD feeding;in part,this effect could be greater than ***:Our data suggest that exercise can improve NAFLD,which is probably due to suppression of MGAT1 pathway.

关键词： Exercise High-fat diet Monoacylglycerol O-acyltransferase 1 Nonalcoholic fatty liver disease Obesity

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Prevalence of coronavirus from diarrheic calves in the Republic of Korea

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Asian Pacific Journal of Tropical Biomedicine 2018年第1期8卷 1-6页

作者： Jinho park Du-Gyeong Han su Hee Kim jeong-Byoung Chae Joon-Seok Chae Do-Hyeon Yu Kyoung-Seong Choi College of Veterinary Medicine Chonbuk National University Department of Animal Science and Biotechnology College of Ecology and Environmental Science Kyungpook National University Animal Disease & Biosecurity Team National Institute of Animal Science Rural Development Administration Laboratory of Veterinary Internal Medicine BK21 PLUS Program for Creative Veterinary Science Research Research Institute for Veterinary Science and College of Veterinary Medicine Seoul National University College of Veterinary Medicine Gyeongsang National University

Objective: To investigate the prevalence of bovine coronavirus(BCo V), bovine rotavirus, and bovine viral diarrhea virus in the feces of normal and diarrheic Korean native calves aged 1-81 days between April and October of 2016 in the Republic of Korea. Methods: Samples were obtained from 50 normal and 93 diarrheic(56 semi-formed, 28 loose, and 9 watery feces) calves in six different regions of northern and southern Korea. These fecal samples were tested for BCo V, bovine rotavirus, and bovine viral diarrhea virus by RT-PCR. Results: Among the three pathogens examined, infection with BCo V was especially prominent in relation to diarrhea among calves aged 1-21 days [odds ratio(OR)=9.3, 95% confidence interval(CI): 1.1-78.9; P=0.02). Infection with BCo V alone(OR=2.9; 95% CI: 1.1-7.6; P=0.03) or coinfection of BCo V with bovine viral diarrhea virus(OR=3.6; 95% CI: 1.0-12.4; P=0.04) was significantly associated with the development of loose feces. Grazing and colostrum intake strongly reduced the occurrence of diarrhea as compared to housed calves(OR=0.2; 95% CI: 0.1-0.4; P=0.00) and calves that had not been fed colostrum(OR=0.2; 95% CI: 0.1-0.7; P=0.02), respectively. Conclusions: The present study suggests that BCo V is involved in calf diarrhea in the Republic of Korea. Therefore, grazing and colostrum intake is recommended for preventing and controlling calf diarrhea caused by BCoV.

关键词： Calf diarrhea Bovine coronavirus Bovine viral diarrhea virus Loose feces Grazing

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