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Formation Mechanism of MgO·Al_(2)O_(3) Spinel Inclusions in Stainless Steelmaking Processes

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Journal of Iron and Steel Research International 2011年第S2期18卷 320-330页

作者： park joo Hyun TODOROKI Hidekazu School of Materials Science and Engineering University of UlsanUlsan 680-749Korea Technical Research Center Nippon Yakin Kogyo Co.Ltd.KawasakishiKanagawa 210-8558Japan

The latest publications regarding the development of technology to control inclusion compositions focusing on MgO?Al2O3 spinel inclusions were summarized in this review article. The problems caused by spinel inclusions, which affect practice as well as products were shown. The formation mechanism of MgO?Al2O3 spinel inclusions is secondly explained thermodynamically from the view points of chemistries of molten steels and slag compositions. Furthermore, crystallization behaviour of spinel was introduced. Countermeasures conducted in practices and laboratories were shown along with some problems still left that should be solved in the future.

关键词： inclusion MgO?Al2O3 spinel thermodynamics crystallization stability deoxidation slag basicity

Topic Models to Analyze Disaster-Related Newspaper Articles: Focusing on COVID-19

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International Journal of Mental Health Promotion 2023年第3期25卷 421-431页

作者： Yun-Jung Choi youn-joo Um Red Cross College of Nursing Chung-Ang UniversitySeoul06974South Korea Department of Nursing Dong-Yang UniversityYeongjuGyeongbuk36040South Korea

Major media outlets have run many articles on the COVID-19 *** the public suffers cognitive and emotional effects related to COVID-19 from such reports,we analyzed and reviewed the topics of news *** searched newspaper articles with the term‘COVID-19’term in four Korean daily newspapers from January 20,2020,when thefirst patient in Korea was found,to June 15,*** modeling analysis was conducted through text mining using *** themes were found:“Changes in people’s everyday life,”“Socio-economic shock,”“Trends in infection,”“Role of the government and business,”and“Increased psychological anxiety,”which all showed sharp increases in articles from mid-February to early March and then *** the increased psychological anxiety people suffered from the COVID-19 pandemic,this topic showed the fewest articles.“Changes in people’s everyday life”showed the most,focusing attention on stimulating lifestyle articles of general *** the COVID-19 pandemic can lead to mental health problems due to severe changes and isolation in everyday life,a comprehensive response to the news focusing on the impact on the mental health of the population around the world should be made.

关键词： COVID-19 mental health newspaper article text mining

Fermentation of mulberry leaves with Cordyceps militaris enhanced anti-adipogenesis activity in 3T3-L1 cells through down-regulation of PPAR-γ pathway signaling

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Asian Pacific Journal of Tropical Medicine 2020年第12期13卷 557-565页

作者： Lu Guo Jum Soon Kang young Hoon park Beong Il Je Dae youn Hwang Woo Hong joo young Whan Choi Department of Horticultural Bioscience Pusan National UniversityMiryang 50463Republic of Korea Department of Biomaterials Science Pusan National UniversityMiryang 50463Republic of Korea Department of Biology and Chemistry Changwon National UniversityChangwon 51140Republic of Korea Life and Industry Convergence Research Institute Pusan National UniversityMiryang 50463Republic of Korea

Objective:To establish an efficacious and efficient fermentation method of enhancing the anti-adipogenesis effect of mulberry(Morus alba) leaves using Cordyceps ***:Dried mulberry leaves,dried mulberry leaves with50% raw silkworm pupa and raw silkworm pupa were fermented with Cordyceps militais for 4 weeks at 25℃,after which the dried mulberry leaves and fermented product were extracted with 70%ethanol and subjected to high performance liquid chromatography(HPLC).The contents of cordycepin,pelargonidin,chlorogenic acid,iso-quercetin and caffeic acid were *** then used the 3 T3-L1 cells to investigate whether extracts of fermentation enhanced anti-adipogenesis activity in ***:HPLC showed that fermentation changed the contents of cordycepin,pelargonidin,chlorogenic acid,iso-quercetin and caffeic ***,fermented dried mulberry leaves with 50% raw silkworm pupa had a better efficacy of anti-adipogenesis than dried mulberry leaves,fermented dried mulberry leaves and fermented silkworm pupa and inhibited triglycerides accumulation and glucose ***,fermented dried mulberry leaves with50% raw silkworm pupa inhibited PPAR-γ ***:Fermentation with Cordyceps militaris enhanced antiadipogenesis efficacy of mulberry leaves.

关键词： dried fermentation silkworm

Robust and Reusable Fuzzy Extractors from Non-Uniform Learning with Errors Problem

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Computers, Materials & Continua 2023年第1期74卷 1985-2003页

作者： joo Woo Jonghyun Kim Jong Hwan park Graduate School of Information Security Korea UniversitySeoul02841Korea Department of Computer Science Sangmyung UniversitySeoul03016Korea

Afuzzy extractor can extract an almost uniformrandom string from a noisy source with enough entropy such as biometric *** reproduce an identical key from repeated readings of biometric data,the fuzzy extractor generates a helper data and a random string from biometric data and uses the helper data to reproduce the random string from the second *** 2013,Fuller et *** a computational fuzzy extractor based on the learning with errors *** construction,however,can tolerate a sub-linear fraction of errors and has an inefficient decoding algorithm,which causes the reproducing time to increase *** 2016,Canetti et *** a fuzzy extractor with inputs from low-entropy distributions based on a strong primitive,which is called digital ***,their construction necessitates an excessive amount of storage space for the helper data,which is stored in authentication *** on these observations,we propose a new efficient computational fuzzy extractorwith small size of helper *** scheme supports reusability and robustness,which are security notions that must be satisfied in order to use a fuzzy extractor as a secure authentication method in real ***,it conceals no information about the biometric data and thanks to the new decoding algorithm can tolerate linear *** on the non-uniform learning with errors problem,we present a formal security proof for the proposed fuzzy ***,we analyze the performance of our fuzzy extractor scheme and provide parameter sets that meet the security *** a result of our implementation and analysis,we show that our scheme outperforms previous fuzzy extractor schemes in terms of the efficiency of the generation and reproduction algorithms,as well as the size of helper data.

关键词： Fuzzy extractor reusability robustness biometric authentication non-uniform learning with errors

Anticancer effects of oligomeric proanthocyanidins on human colorectal cancer cell line, SNU-C4

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World Journal of Gastroenterology 2005年第30期11卷 4674-4678页

作者： youn-Jung Kim Hae-Jeong park Seo-Hyun Yoon Mi-Ja Kim Kang-Hyun Leem joo-Ho Chung Hye-Kyung Kim Department of Dental Hygiene Department of Pharmacology Department of Obesity Management College of Oriental Medicine Department of Food and Biotechnology

AIM: Oligomeric proanthocyanidins (OPC), natural polyphenolic compounds found in plants, are known to have antioxidant and anti-cancer effects. We investigated whether the anti-cancer effects of the OPC are induced by apoptosis on human colorectal cancer cell line, ***: Colorectal cancer cell line, SNU-C4 was cultured in RPMI 1640 medium supplemented with 10% fetal bovine serum. The cytotoxic effect of OPC was assessed by 3-(4, 5-dimethylthiazol-2-yl)-2, 5-diphenylt-etrazolium bromide (MTT) assay. To find out the apoptotic cell death, 4, 6-diamidino-2-phenylindole (DAPI) staining,terminal deoxynucleotidyl transferase (TdT)-mediated dUTP nick end labeling (TUNEL) assay, reverse transcriptionpolymerase chain reaction (RT-PCR), and caspase-3 enzyme assay were ***: In this study, cytotoxic effect of OPC on SNUC4 cells appeared in a dose-dependent manner. OPC treatment (100 μg/mL) revealed typical morphological apoptotic features. Additionally OPC treatment (100 μg/mL)increased level of BAX and CASPASE-3, and decreased level of BCL-2 mRNA expression. Caspase-3 enzyme activity was also significantly increased by treatment of OPC (100 μg/mL) compared with ***: These data indicate that OPC caused cell death by apoptosis through caspase pathways on human colorectal cancer cell line, SNU-C4.

关键词： Oligomeric pranthocyanidins Apoptosis Anticancer effects Colorectal cancer

Evolution of nonmetallic inclusions in 80-t 9CrMoCoB large-scale ingots during electroslag remelting process

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International Journal of Minerals,Metallurgy and Materials 2024年第7期31卷 1525-1539页

作者： Shengchao Duan Min joo Lee Yao Su Wangzhong Mu Dong Soo Kim joo Hyun park School of Mechanical and Materials Engineering North China University of TechnologyBeijing 100144China Department of Materials Science and Chemical Engineering Hanyang UniversityAnsan 15588Rep.of Korea Department of Materials Science and Engineering KTH Royal Institute of TechnologyBrinellvägen 23Stockholm 10044Sweden Department of Engineering Science and Mathematics Division of Materials ScienceLuleåUniversity of Technology97187 LuleåSweden Casting&Forging Business Unit Nuclear Business GroupDoosan EnerbilityChangwon 51711Rep.of Korea

In combination with theoretical calculations,experiments were conducted to investigate the evolution behavior of nonmetallic inclusions(NMIs)during the manufacture of large-scale heat-resistant steel ingots using 9CrMoCoB heat-resistant steel and CaF_(2)–CaO–Al_(2)O_(3)–SiO_(2)–B_(2)O_(3)electroslag remelting(ESR)-type slag in an 80-t industrial ESR *** main types of NMI in the consumable electrode comprised pure alumina,a multiphase oxide consisting of an Al_(2)O_(3)core and liquid CaO–Al_(2)O_(3)–SiO_(2)–MnO shell,and M_(23)C_(6)carbides with an MnS *** Al_(2)O_(3)and MnS inclusions had higher precipitation temperatures than the M_(23)C_(6)-type carbide under equilibrium and nonequilibrium solidification ***,inclusions can act as nucleation sites for carbide layer *** ESR process completely removed the liquid CaO–Al_(2)O_(3)–SiO_(2)–MnO oxide and MnS inclusion with a carbide shell,and only the Al_(2)O_(3)inclusions and Al_(2)O_(3)core with a carbide shell occupied the remelted *** M_(23)C_(6)-type carbides in steel were determined as Cr_(23)C_(6)based on the analysis of transmission electron microscopy *** substitution of Cr with W,Fe,or/and Mo in the Cr_(23)C_(6)lattice caused slight changes in the lattice parameter of the Cr_(23)C_(6)***,Cr_(21.34)Fe_(1.66)C_(6),(Cr_(19)W_(4)C_(6),Cr_(18.4)Mo_(4.6)C_(6),and Cr_(16)Fe_(5)Mo_(2)C_(6)can match the fraction pattern of Cr_(23)C_(6)*** Al_(2)O_(3)inclusions in the remelted ingot formed due to the reduction of CaO,SiO_(2),and MnO components in the liquid *** increased Al content in liquid steel or the higher supersaturation degree of Al_(2)O_(3)precipitation in the remelted ingot than that in the electrode can be attributed to the evaporation of CaF_(2)and the increase in CaO content in the ESR-type slag.

关键词： nonmetallic inclusion heat-resistant steel electroslag remelting M_(23)C_(6) carbide MnS inclusion supersaturation degree

Indolocarbazole-Based Small Molecule Cathode-Active Material Exhibiting Double Redox for High-Voltage Li-Organic Batteries

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Energy & Environmental Materials 2024年第5期7卷 86-94页

作者： Hyunji park Hyojin Kye Jong-Sung Lee young-Chang joo Dong joo Min Bong-Gi Kim Soo young park Ji Eon Kwon Laboratory for Supramolecular Optoelectronic Materials(LSOM) Department of Materials Science and EngineeringResearch Institute of Advanced Materials(RIAM)Seoul National University1 Gwanak-roGwanak-guSeoul 08826Korea Functional Composite Materials Research Center Jeonbuk Institute of Advanced Composite MaterialsKorea Institute of Science and Technology(KIST)92 Chudong-roBongdong-eupWanju-gunJeonbuk 55324Korea Department of Organic and Nano System Engineering Konkuk University120 Neungdong-roGwangjin-guSeoul 05029Korea Department of Materials Science and Engineering Seoul National University1 Gwanak-roGwanak-guSeoul 08826Korea Department of JBNU-KIST Industry Academia Convergence Research Jeonbuk National University567 Baekje-daeroDeokjin-guJeonjuJeonbuk 54896Korea

Most organic electrode materials(OEMs)for rechargeable batteries employ n-type redox centers,whose redox potentials are intrinsically limited<3.0 V versus Li^(+)/***,p-type materials possessing high redox potentials experience low specific capacities because they are capable of only a single redox reaction within the stable electrochemical window of typical ***,we report 5,11-diethyl-5,11-dihydroindolo[3,2-b]carbazole(DEICZ)as a novel p-type OEM,exhibiting stable plateaus at high discharge potentials of 3.44 and 4.09 V versus Li^(+)/***,the second redox potential of DEICZ is within the stable electrochemical *** mechanism of the double redox reaction is investigated using both theoretical calculations and experimental measurements,including density functional theory calculations,ex situ electron spin resonance,and X-ray photoelectron ***,hybridization with single-walled carbon nanotubes(SWCNT)improves the cycle stability and rate performance of DEICZ owing to theπ-πinteractions between the SWCNT and co-planar molecular structure of DEICZ,preventing the dissolution of active materials into the *** DEICZ/SWCNT composite electrode maintains 70.4%of its initial specific capacity at 1-C rate and also exhibits high-rate capability,even performing well at 100-C ***,we demonstrate its potential for flexible batteries after applying 1000 bending stresses to the composite electrode.

关键词： composite electrodes flexible batteries indolocarbazoles organic rechargeable batteries p-type

Diagnostic evaluation of endoscopic ultrasonography with submucosal saline injection for differentiating between T1a and T1b early gastric cancer

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World Journal of Gastroenterology 2022年第46期28卷 6564-6572页

作者： Ji young park Tae joo Jeon Department of Internal Medicine Inje University College of MedicineSanggye Paik HospitalSeoul 01757South Korea Department of Internal Medicine Yonsei University College of MedicineSeoul 03722South Korea

BACKGROUND Endoscopic ultrasonography(EUS)has become a reliable method for predicting the invasion depth of early gastric cancer(EGC).However,diagnostic accuracy of EUS is affected by several *** particular,it is difficult to differentiate between T1a and T1b EGC through *** To confirm whether submucosal saline injection(SSI)could improve the accuracy of EUS in distinguishing T1a and T1b lesions in *** Twenty-four patients with EGC were examined by EUS and subsequently by SSI combined EUS to compare the degree of tumor ***,they underwent endoscopic or surgical resection within 7 *** diagnostic accuracy of EUS and SSI combined EUS was evaluated based on the final pathological findings *** injected into the submucosa acted as an echoic contrast enhancing agent and had the effect of distinguishing the mucosal and submucosal layers *** Of total 24 patients,23 were diagnosed with EGC(T1 cancer:13 as T1a,and 10 as T1b).Standard EUS identified 6 of 13 T1a cancer patients and 3 of 10 T1b cancer ***,EUS-SSI identified 12 of 13 T1a cancer patients and 6 of 10 T1b cancer *** this study,SSI combined EUS was more accurate than EUS alone in diagnosing T1a and T1b lesions of EGC(75.0%and 37.5%,respectively).CONCLUSION SSI improved the diagnostic accuracy of EUS in distinguishing between the T1a and T1b stages in EGC.

关键词： Endoscopic ultrasonography Gastric cancer Endoscopy Surgery

Clinical significance of the neutrophil-lymphocyte ratio as an early predictive marker for adverse outcomes in patients with acute pancreatitis

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World Journal of Gastroenterology 2017年第21期23卷 3883-3889页

作者： Tae joo Jeon Ji young park Division of Gastroenterology Department of Internal Medicine Inje University College of Medicine Sanggye Paik Hospital

AIM To investigated the prognostic value of the neutrophillymphocyte ratio(NLR) in patients with acute pancreatitis and determined an optimal cut-off value for the prediction of adverse outcomes in these *** We retrospectively analyzed 490 patients with acute pancreatitis diagnosed between March 2007 and December 2012. NLRs were calculated at admission and 24, 48, and 72 h after admission. Patients were grouped according to acute pancreatitis severity and organ failure occurrence, and a comparative analysis was performed to compare the NLR between groups. RESULTS Among the 490 patients, 70 had severe acute pancreatitis with 31 experiencing organ failure. The severe acute pancreatitis group had a significantly higher NLR than the mild acute pancreatitis group on all 4 d(median, 6.14, 6.71, 5.70, and 4.00 vs 4.74, 4.47, 3.20, and 3.30, respectively, P < 0.05). The organ failure group had a significantly higher NLR than the group without organ failure on all 4 d(median, 7.09, 6.72, 6.27, and 6.24 vs 4.85, 4.49, 3.35, and 2.34, respectively, P < 0.05). The optimal cut-off value for baseline NLR was 4.76 in predicting severity and 4.88in predicting organ failure in acute pancreatitis. CONCLUSION Elevated baseline NLR correlates with severe acute pancreatitis and organ failure.

关键词： Acute pancreatitis Neutrophil-lymphocyte ratio Organ failure Severe acute pancreatitis