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Formation of intermetallic compound at interface between rare earth elements and ferritic-martensitic steel by fuel cladding chemical interaction

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Journal of Rare Earths 2012年第6期30卷 599-603页

作者： Jun Hwan Kim byoung Oon lee Chan Bock lee Seung Hyun Jee Young Soo Yoon Advanced Fuel Development Division Korea Atomic Energy Research InstituteP.O.Box 105YuseongDaejeon305-600Republic of Korea Department of Mate-rials Science and Engineering Yonsei University134 Sinchon DongSeoul120-749Republic of Korea

The intermetallic compounds formation at interface between rare earth elements and clad material were investigated to demonstrate the effects of rare earth elements on fuel-cladding chemical interaction （FCCI） behavior. Mischmetal （70Ce-30La） and Nd were prepared as rare earth elements. Diffusion couple testing was performed on the rare earth elements and cladding （9Cr2W steel） near the operation temperature of （sodium-cooled fast reactor） SFR fuel. The performance of a diffusion barrier consisting of Zr and V metallic foil against the rare earth elements was also evaluated. Our results showed that Ce and Nd in the rare earth elements and Fe in the clad material interdiffused and reacted to form intermetallic species according to the parabolic rate law, describing the migration of the rare earth element. The diffusion of Fe limited the reaction progress such that the entire process was governed by the cubic rate law. Rare earth materials could be used as a surrogate for high burnup metallic fuels, and the performance of the barrier material was demonstrated to be effective.

关键词： intermetallic compound sodium-cooled fast reactor (SFR) metallic fuel fuel-cladding chemical interaction (FCCI) rare earths Barrier

Comparative analyses of the venom components in the salivary gland transcriptomes and saliva proteomes of some heteropteran insects

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Insect Science 2022年第2期29卷 411-429页

作者： Kyungjae Andrew Yoon Woo-Jin Kim Seungki lee Hee-Sun Yang byoung-Hee lee Si Hyeock lee Research Institute of Agriculture and Life Sciences Seoul National UniversitySeoulKorea EntoCode Co. SeoulKorea National Institute of Biological Resources Environmental Research ComplexIncheonKorea Department of Agricultural Biology Seoul National UniversitySeoulKorea

Salivary gland-specific transcriptomes of nine heteropteran insects with distinct feeding strategies (predaceous, hematophagous, and phytophagous) were analyzed and annotated to compare and identify the venom components as well as their expression profiles. The transcriptional abundance of venom genes was verified via quantitative real-time PCR. Hierarchical clustering of 30 representative differentially expressed venom genes from the nine heteropteran species revealed unique groups of salivary gland-specific genes depending on their feeding strategy. The commonly transcribed genes included a paralytic neurotoxin (arginine kinase), digestive enzymes (cathepsin and serine protease), an anti-inflammatory protein (cystatin), hexamerin, and an odorant binding protein. Both predaceous and hematophagous (bed bug) heteropteran species showed relatively higher transcription levels of genes encoding proteins involved in proteolysis and cytolysis, whereas phytophagous heteropterans exhibited little or no expression of these genes, but had a high expression of vitellogenin, a multifunctional allergen. Saliva proteomes from four representative species were also analyzed. All venom proteins identified via saliva proteome analysis were annotated using salivary gland transcriptome data. The proteomic expression profiles of venom proteins were in good agreement with the salivary gland-specific transcriptomic profiles. Our results indicate that profiling of the salivary gland transcriptome provides important information on the composition and evolutionary features of venoms depending on their feeding strategy.

关键词： hematophagous heteroptera phytophagous predaceous proteome analysis salivary gland-specific venom transcriptome analysis

Tribological properties of multilayer tetrahedral amorphous carbon coatings deposited by filtered cathodic vacuum arc deposition

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Friction 2021年第5期9卷 1292-1302页

作者： Young-Jun JANG Jae-il KIM WooYoung lee Jongkuk KIM Department of Extreme Environmental Coatings Surface Technology DivisionKorea Institute of Materials Science(KIMS)Gyeongnam-do 51508Republic of Korea Department of Mechanical Science and Engineering Graduate School of EngineeringNagoya UniversityNagoya 464-8603Japan

Tetrahedral amorphous carbon(ta‐C)has emerged as an excellent coating material for improving the reliability of application components under high normal ***,we present the results of our investigations regarding the mechanical and tribological properties of a 2‐μm‐thick multilayer ta‐C coating on high‐speed steel *** composed of alternating soft and hard layers are fabricated using filtered a cathodic vacuum arc with alternating substrate bias voltages(0 and 100 V or 0 and 150 V).The thickness ratio is discovered to be 1:3 for the sp2‐rich and sp3‐rich *** results show that the hardness and elastic modulus of the multilayer ta‐C coatings increase with the sp3 content of the hard *** hardness reached approximately 37 GPa,whereas an improved toughness and a higher adhesion strength(>29 N)are *** friction performance(μ=0.07)of the multilayer coating is similar to that of the single layer ta‐C thick coating,but the wear rate(0.13×10^(–6) mm^(3)/(N∙m))improved under a high load of 30 *** further demonstrate the importance of the multilayer structure in suppressing crack propagation and increasing the resistance to plastic deformation(H3/E2)ratio.

关键词： tetrahedral amorphous carbon(ta‐C) filtered cathodic vacuum arc deposition multilayer coatings alternating substrate bias voltage wear resistance plastic deformation resistance

Inverse relationship between bioavailable testosterone and subclinical coronary artery calcification in non-obese Korean men

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Asian Journal of Andrology 2012年第4期14卷 612-615页

作者： byoung-Jin Park Jae-Yong Shim Yong-Jae lee Jung-Hyun lee Hye-Ree lee Department of Family Medicine Yonsei University College of Medicine Seou1135-720 Korea Department of Health Promotion Center Gangnam Severance Hospita Yonsei University College of Medicine Seou1135-720 Korea

Although low testosterone levels in men have been associated with high risk for cardiovascular disease, little is known about the association between male sex hormones and subclinical coronary disease in men with apparently low cardiometabolic risk. This study was performed to investigate the association between male sex hormones and subclinical coronary artery calcification measured as coronary calcium score in non-obese Korean men. We examined the relationship of total testosterone, sex hormone-binding globulin, bioavai lable testosterone and free testosterone with coronary calcium score in 291 non-obese Korean men （mean age： 52.8--- 9.3 years） not having a history of cardiovascular disease. Using multiple linear regression, we evaluated associations between log （sex hormone） levels and log （coronary calcium score） after adjusting for confounding variables in 105 men with some degree of coronary calcification defined as coronary calcium score ~〉 1. In multiple linear regression analysis, bioavailable testosterone was inversely associated with coronary calcium score （P=0.046） after adjusting for age, body mass index, smoking status, alcohol consumption, regular exercise, mean blood pressure, resting heart rate, C-reactive protein, fasting plasma glucose, total cholesterol, triglyceride, high-density lipoprotein （HDL） cholesterol, hypertension medication and hyperlipidernia medication, whereas total testosterone, sex hormone-binding globulin and free testosterone were not （P=0.674, P=O. 121 and P=O. 102, respectively）. Our findings indicate that bioavailable testosterone is inversely associated with the degree of subclinical coronary artery calcification in non-obese men.

关键词： bioavailable testosterone cardiovascular disease coronary calcium score male sex hormone subclinical coronary arterydisease testosterone

Crustal growth history of the Korean Peninsula: Constraints from detrital zircon ages in modern river sediments

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Geoscience Frontiers 2016年第5期7卷 707-714页

作者： Taejin Choi Yong il lee Yuji Orihashi Department of Energy and Resources Engineering Chosun University School of Earth and Environmental Sciences Seoul National University Earthquake Research Institute The University of Tokyo

U-Pb analyses were carried out on detrital zircon grains from major river-mouth sediments draining South Korea to infer provenance characteristics and the crustal growth history of the southern Korean Peninsula, using a laser ablation inductively coupled plasma mass spectrometer（LA-ICP-MS）. The Korean Peninsula is located in the East Asian continental margin and mainly comprises three Precambrian massifs and two metamorphic belts in between them. We obtained 515 concordant to slightly discordant zircon ages ranging from ca. 3566 to ca. 48 Ma. Regardless of river-mouth location, predominance of Mesozoic（249e79 Ma） and Paleoproterozoic（2491e1691 Ma） ages with subordinate Archean ages indicates that the zircon ages reflect present exposures of plutonic/metamorphic rocks in the drainage basins of the South Korean rivers and the crustal growth of the southern Korean Peninsula was focused in these two periods. Comparison of detrital zircon-age data between the North and South Korean river sediments reveals that the Paleoproterozoic zircon age distributions of both regions are nearly identical,while the Neoproterozoice Paleozoic ages exist and the Mesozoic ages are dominant in southern Korean Peninsula. This result suggests that Precambrian terrains in Korea record the similar pre-Mesozoic magmatic history and that the influence of Mesozoic magmatism was mainly focused in South Korea.

关键词： Detrital zircon U-Pb age dating Crustal growth Korean Peninsula Provenance

Machine Learning-Based Efficient Discovery of Software Vulnerability for Internet of Things

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Intelligent Automation & Soft Computing 2023年第8期37卷 2407-2419页

作者： So-Eun Jeon Sun-Jin lee il-Gu lee Department of Future Convergence Technology Engineering Sungshin Women’s UniversitySeoul02844Korea

With the development of the 5th generation of mobile communi-cation(5G)networks and artificial intelligence(AI)technologies,the use of the Internet of Things(IoT)has expanded throughout *** IoT networks have improved industrial productivity and convenience,they are highly dependent on nonstandard protocol stacks and open-source-based,poorly validated software,resulting in several security ***-ever,conventional AI-based software vulnerability discovery technologies cannot be applied to IoT because they require excessive memory and com-puting *** study developed a technique for optimizing training data size to detect software vulnerabilities rapidly while maintaining learning *** results using a software vulnerability classification dataset showed that different optimal data sizes did not affect the learning performance of the learning ***,the minimal data size required to train a model without performance degradation could be determined in *** example,the random forest model saved 85.18%of memory and improved latency by 97.82%while maintaining a learning accuracy similar to that achieved when using 100%of data,despite using only 1%.

关键词： Lightweight devices machine learning deep learning software vulnerability detection common weakness enumeration

Damage Identiﬁcation of Truss Structures Based on Force Method

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Advances in Applied Mathematics and Mechanics 2015年第2期7卷 229-244页

作者： Nam-il Kim Seunghye lee Namshik Ahn Jaehong lee Department of Architectural Engineering Sejong University98 Kunja DongKwangjin KuSeoul 143-747Korea

An computationally efﬁcient damage identiﬁcation technique for the planar and space truss structures is presented based on the force method and the micro ge-netic *** this purpose,the general equilibrium equations and the kinematic relations in which the reaction forces and the displacements at nodes are take into ac-count,respectively,are *** compatibility equations in terms of forces are explicitly presented using the singular value decomposition(SVD)*** governing equations with unknown reaction forces and initial elongations are ***,the micro genetic algorithm(MGA)is used to properly identify the site and ex-tent of multiple damage cases in truss *** order to verify the accuracy and the superiority of the proposed damage detection technique,the numerical solutions are presented for the planar and space truss *** numerical results indicate that the combination of the force method and the MGA can provide a reliable tool to accurately and efﬁciently identify the multiple damages of the truss structures.

关键词： Damage identiﬁcation truss force method micro genetic algorithm

Quantitative analysis of mechanical properties associated with aging treatment and microstructure in Mg-Al-Zn alloys through machine learning

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Journal of Materials Science & Technology 2022年第12期107卷 52-63页

作者： Joung Sik Suh Byeong-Chan Suh Sang Eun lee Jun Ho Bae byoung Gi Moon Advanced Metals Division Korea Institute of Materials ScienceChangwon 51508Republic of Korea

The present study proposes a methodology for predicting the mechanical properties of AZ61 and AZ91alloys associated with microstructure,texture and aging parameters and estimating predictor *** this,we investigate quantitative correlations between microstructure,texture and mechanical properties of aged AZ61 and AZ91 rods through machine *** regression analysis focuses on the precipitation behavior of Mg17Al12as the main second phase of Mg-Al-Zn alloys with respect to aging *** simplify data generation,only SEM images were used to quantify the features of discontinuous and continuous *** overcome the lack of data and make the most of the measured data,we devised a method to extend the existing dataset by a factor of 9 using the mean and standard deviation of the measured *** neural networks predicted tensile and compressive yield strengths and resultant yield asymmetry with a high accuracy of over 98%using 11 predictors for a total of *** tree learning quantitatively assessed the importance of predictors in determining the mechanical properties of aged AZ61 and AZ91 rods.

关键词： Magnesium alloy Aging treatment Microstructure Mechanical properties Machine learning

Development of a valid and reliable seven emotions impairment questionnaire and assessment of its predictability for phlegm and blood stasis

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Journal of Traditional Chinese Medicine 2016年第4期36卷 547-554页

作者： byoung-Hee lee Min-Yong Kim Young-Bae Park Young-Jae Park Department of Diagnosis and Biofunctional Medicine College of Korean MedicineKyung Hee University Seou102447 Korea Business School Kyung Hee UniversitySeou 102447 Korea Department of Diagnosis and Biofunctional Medicine College of Korean Medicine Kyung Hee University Seoul 02447 Korea Department of Diag-nosis and Biofunctional Medicine Kyung Hee UniversityHospital at Gangdong Seoul 05278 Korea.

OBJECTIVE:To develop and validate a Seven Emotions Impairment questionnaire(SEIQ),to define an optimum cut-off point for the SEIQ,and to examine whether SEI was predictive of Phlegm and Blood Stasis(BS).METHODS:Two hundred outpatients and 75 college students were asked to complete the SEIQ,the Profile of Mood States(POMS),Phlegm Pattern Questionnaire(PPQ),and BS Questionnaire(BSQ).Twelve clinicians determined whether the outpatients exhibited *** data were used to examine the internal consistency and determine validity for the ***,POMS,PPQ,and BSQ data were used to examine concurrent validity and predictability of SEI for Phlegm and BS in the college *** SEIQ scores and the clinicians' diagnoses of the outpatients were considered to define an optimum cut-off score for the ***:The 18-item SEIQ had satisfactory internal consistency(α = 0.905) and concurrent *** the construct validity test,four factors(chest-anxiety,fatigue-depression,working-family-troubles,and sleep-memory) were *** the receiver operator characteristic curve curve analysis,the sensitivity,specificity,and area under the curve of the SEIQ were 67.2%,72.1%,and 73%,*** optimum cut-off score was defined as nine *** scores were strongly predictive of Phlegm and BS(β = 0.862 and 0.673,respectively).CONCLUSION:Based on our results,we concluded that the SEIQ is a reliable and valid instrument for evaluating SEI,and is strongly predictive of Phlegm and BS.

关键词： Seven emotions Intermingled phlegm and blood-stasis Surveys and questionnaires Diagnosis Reference standards Mental health