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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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Flow characteristics of aluminum coated boron steel in hot press forming

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中国有色金属学会会刊：英文版 2009年第4期19卷 913-916页

作者： jeong-hwan JANG Jae-Ho LEE Bye ong-Don JOO Young-Hoon MOON School of Mechanical Engineering Pusan National University

The flow characteristics of aluminum coated boron steel in hot press forming were ***,the effects of aluminum coated layer on press forming were analyzed during deep *** results show that aluminum coated boron steel exhibits a high sensitivity on temperature and strain *** coating layer appears in surface flaking in a temperature range of 700-800 ℃,but smooth surface is formed above 900 ℃.

关键词：热压成型流动特性铝涂层硼钢表面剥落温度范围冲压成形高灵敏度

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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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Statistical Prediction of Heavy Rain in South Korea

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Advances in Atmospheric Sciences 2005年第5期22卷 703-710页

作者： Keon Tae SOHN jeong Hyeong LEE Soon hwan LEE Chan Su RYU Pusan National University Busan 609-735 KoreaDong-A University Busan 604-714 Korea Chosun University Gwangju 501-759 KoreaChosun University Gwangju 501-759 Korea

This study is aimed at the development of a statistical model for forecasting heavy rain in South Korea. For the 3-hour weather forecast system, the 10 km×10 km area-mean amount of rainfall at 6 stations （Seoul, Daejeon, Gangreung, （Jwangju, Busan, and Jeju） in South Korea are used. And the corresponding 45 synoptic factors generated by the numerical model are used as potential predictors. Four statistical forecast models （linear regression model, logistic regression model, neural network model and decision tree model） for the occurrence of heavy rain are based on the model output statistics （MOS） method. They are separately estimated by the same training data. The thresholds are considered to forecast the occurrence of heavy rain because the distribution of estimated values that are generated by each model is too skewed. The results of four models are compared via Heidke skill scores. As a result, the logistic regression model is recommended.

关键词： heavy rain model output statistics linear regression logistic regression neural networks,decision tree

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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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Vertical plane depth-resolved surface potential and carrier separation characteristics in flexible CZTSSe solar cells with over 12% efficiency

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Carbon Energy 2024年第3期6卷 36-52页

作者： Dae-Ho Son Ha Kyung park Dae-hwan Kim Jin-Kyu Kang Shi-Joon Sung Dae-Kue hwang Jaebaek Lee Dong-hwan Jeon Yunae Cho William Jo Taeseon Lee JunHo Kim Sang-Hoon Nam Kee-jeong Yang Division of Energy Technology DGISTDaeguRepublic of Korea Research Center for Thin Film Solar Cells DGISTDaeguRepublic of Korea Department of Physics Ewha Womans UniversitySeoulRepublic of Korea Department of Physics Incheon National UniversityIncheonRepublic of Korea Department of Mechanical Engineering Massachusetts Institute of TechnologyCambridgeMassachusettsUSA

Cu2ZnSn(S,Se)4(CZTSSe)solar cells have resource distribution and economic *** main cause of their low efficiency is carrier loss resulting from recombination of photo-generated electron and *** overcome this,it is important to understand their electron-hole behavior *** determine the carrier separation characteristics,we measured the surface potential and the local current in terms of the absorber *** elemental variation in the intragrains(IGs)and at the grain boundaries(GBs)caused a band edge shift and bandgap(Eg)*** the absorber surface and subsurface,an upward Ec and Ev band bending structure was observed at the GBs,and the carrier separation was *** the absorber center,both upward Ec and Ev and downward Ec-upward Ev band bending structures were observed at the GBs,and the carrier separation was *** improve the carrier separation and suppress carrier recombination,an upward Ec and Ev band bending structure at the GBs is desirable.

关键词： carrier separation CZTSSe flexible solar cell local current surface potential

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The 5-year functional outcomes after radical prostatectomy： a real-life experience in Korea

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Asian Journal of Andrology 2010年第6期12卷 835-840页

作者： Sung Kyu Hong Seung hwan Doo Dae Sung Kim Won Ki Lee Hong Zoo park Ji Hyun park Seong Jin jeong Cheol Yong Yoon Seok-Soo Byun Sang Eun Lee Department of Urology Seoul National University Bundang Hospital Seongnam Kyunggi-do 463-707 Korea

We investigated the functional outcomes regarding erectile function and urinary continence up to 5 years following radical prostatectomy （RP） in a cohort of Korean men. We retrospectively analyzed the clinicopathologic data of 85 Korean men who received open uni- or bilateral nerve-sparing RP for clinically localized prostate cancer and were followed up for at least 5 years postoperatively. From medical records, patients＇ status regarding urinary and erectile function at baseline and postoperative followups after RP was assessed. At 24 and 60 months after RP, proportions of subjects continent （no pads used） were 89.4% and 97.6%, respectively （P = 0.007）. Excluding subjects （n = 24） who preoperatively reported having severe erectile dysfunction or lacked relevant informations, proportions of subjects capable of having vaginal intercourse regardless of erectile aid usage were 47.5% and 37.7% at 24 and 60 months from RP, respectively （P = 0.022）. Patient＇s age at surgery （P = 0.047） and salvage radiation therapy （P = 0.026） were observed to be significant predictors of having erections sufficient for intercourse at 60 months from RP in multivariate analysis. Our results showed that while patients＇ postoperative status regarding urinary continence at 2 years from RP is generally maintained or improved at 5 year point, erectile function was observed to significantly declined from 2 years to 5 years following RP. Such decline in erectile function following RP may be more significant among men who were relatively older at surgery or those who received salvage therapy during postoperative follow-ups.

关键词： impotence prostatectomy prostatic neoplasm urinary incontinence

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Double layered self-expanding metal stents for malignant esophageal obstruction, especially across the gastroesophageal junction

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World Journal of Gastroenterology 2012年第28期18卷 3732-3737页

作者： Min Dae Kim Su Bum park Dae hwan Kang Jae Hyung Lee Cheol Woong Choi Hyung Wook Kim Chung Uk Chung Young Il jeong Department of Internal Medicine Bongseng Memorial Hospital Busan 601-723 South Korea Department of Internal Medicine Pusan National University School of Medicine and Research Institute for Convergence of Biomedical Science and Technology Pusan National University Yangsan Hospital Yangsan 626-770 South Korea

AIM: To evaluate the clinical outcomes of double-layered self-expanding metal stents (SEMS) for treatment of malignant esophageal obstruction according to whether SEMS crosses the gastroesophageal junction (GEJ). METHODS: Forty eight patients who underwent the SEMS insertion for malignant esophageal obstruction were enrolled. Patients were classified as GEJ group (SEMS across GEJ, 18 patients) and non-GEJ group (SEMS above GEJ, 30 patients) according to SEMS position. Double layered (outer uncovered and inner covered stent) esophageal stents were placed. RESULTS: The SEMS insertion and the clinical improvement were achieved in all patients in both groups. Stent malfunction occurred in seven patients in the GEJ group and nine patients in the non-GEJ group. Tumor overgrowth occurred in five and eight patients, respectively, food impaction occurred in one patient in each group, and stent migration occurred in one and no patient, respectively. There were no significant differences between the two groups. Reflux esophagitis occurred more frequently in the GEJ group (eight vs five patients, P = 0.036) and was controlled by proton pump inhibitor. Aspiration pneumonia occurred in zero and five patients, respectively, and tracheoesophageal fistula occurred in zero and two patients, respectively. CONCLUSION: Double-layered SEMS are a feasible and effective treatment when placed across the GEJ for malignant esophageal obstruction. Double-layered SEMS provide acceptable complications, especially migration, although reflux esophagitis is more common in the GEJ group.

关键词： Metal stent Gastroesophageal junction Malignant esophageal obstruction

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Investigation of prodromal features in metabolic syndrome based on transcriptome analysis

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Genes & Diseases 2023年第3期10卷 708-711页

作者： Sang-Min park Musun park Hyo-jeong Ban Su-Jin Baek Soo Yeon Kim Siwoo Lee Hee-jeong Jin Korean Medicine(KM)Data Division Korea Institute of Oriental MedicineDaejeon 34054Republic of Korea College of Pharmacy Chungnam National UniversityDaejeon 34134Republic of Korea

Metabolic syndrome(MetS)is a complex condition that significantly increases the risk of several diseases,including heart disease and *** with MetS show both pro-inflammatory and pro-thrombotic states;however,the state... 详细信息

关键词： diseases Metabolic Patients

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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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