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Influence of Vanadium Content on Hot Deformation Behavior of Low-Carbon Boron Microalloyed Steel

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Acta Metallurgica Sinica(English Letters) 2020年第5期33卷 705-715页

作者： Kwang-Su Kim Lin-Xiu Du hyo-sung Choe Tae-hyong lee Gyong-Chol lee Department of Materials Science and Engineering Kim Chaek University of TechnologyPyongyang 999093Democratic People’s Republic of Korea State Key Laboratory of Rolling and Automation Northeastern UniversityShenyang 110819China

Single-pass compression tests were performed to investigate the hot deformation behavior of low-carbon boron microalloyed steel containing three various vanadium contents at 900-1100℃and strain rate of 0.01-10 s-1 using the MMS-300 thermal mechanical *** flow stress curves of investigated steels were obtained under the different deformation conditions,and the effects of the deformation temperature and strain rate on the flow stress were *** characteristic points of flow stress were obtained from the stress dependence of strain hardening rate;the activation energy of investigated steels was determined by the regression analysis;the flow stress constitutive equations were developed;the effect of vanadium content on the flow stress and dynamic recrystallization(DRX)was *** result showed that the flow stress and activation energy(3-6.5 kJ mol-1)of the steel containing 0.18 wt%V were significantly higher than those of the steels with0.042 wt%and 0.086 wt%V,which was related to the increase in solute drag and precipitation effects for higher vanadium *** analysis showed that the addition of vanadium can delay the initiation and the rate of DRX.

关键词： Boron microalloyed steel Vanadium Flow stress Hot deformation Dynamic recrystallization

Feature-Oriented Nonfunctional Requirement Analysis for Software Product Line

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Journal of Computer Science & Technology 2009年第2期24卷 319-338页

作者：彭鑫 Seok-won lee 赵文耘 School of Computer Science Fudan University Knowledge-Intensive Software Engineering Research Group Department of Software and Information Systems College of Computing and Informatics University of North Carolina at Charlotte

Domain analysis in software product line （SPL） development provides a basis for core assets design and imple- mentation by a systematic and comprehensive commonality/variability analysis. In feature-oriented SPL methods, products of the domain analysis are domain feature models and corresponding feature decision models to facilitate application-oriented customization. As in requirement analysis for a single system, the domain analysis in the SPL development should con- sider both flmctional and nonfunctional domain requirements. However, the nonfunctional requirements （NFRs） are often neglected in the existing domain analysis methods. In this paper, we propose a context-based method of the NFR analysis for the SPL development. In the method, NFRs are materialized by connecting nonfunctional goals with real-world context, thus NFR elicitation and variability analysis can be performed by context analysis for the whole domain with the assistance of NFR templates and NFR graphs. After the variability analysis, our method integrates both functional and nonfunc- tional perspectives by incorporating the nonfunctional goals and operationalizations into an initial functional feature model. NFR-related constraints are also elicited and integrated. Finally, a decision model with both functional and nonfunctional perspectives is constructed to facilitate application-oriented feature model customization. A computer-aided grading system （CAGS） product line is employed to demonstrate the method throughout the paper.

关键词： software product line nonfunctional requirement domain analysis feature-oriented method variability analysis

Convolutional Neural Network-Based Regression for Predicting the Chloride Ion Diffusion Coefficient of Concrete

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Computers, Materials & Continua 2022年第3期70卷 5059-5071页

作者： Hyun Kyu Shin Ha Young Kim Sang hyo lee Architectural Engineering Hanyang University ERICAAnsan15588Korea Graduate School of Information Yonsei UniversitySeoul03722Korea Division of Smart Convergence Engineering Hanyang University ERICAAnsan15588Korea

The durability performance of reinforced concrete(RC)building structures is significantly affected by the corrosion of the steel reinforcement due to chloride penetration,thus,the chloride ion diffusion coefficient should be investigated through experiments or theoretical equations to assess the durability of an RC *** study aims to predict the chloride ion diffusion coefficient of concrete,a heterogeneous material.A convolutional neural network(CNN)-based regression model that learns the condition of the concrete surface through deep learning,is developed to efficiently obtain the chloride ion diffusion *** the model implementation to determine the chloride ion diffusion coefficient,concrete mixes with w/c ratios of 0.33,0.40,0.46,0.50,0.62,and 0.68,are cured for 28 days;subsequently,the surface image data of the specimens are ***,the proposed model predicts the chloride ion diffusion coefficient using the concrete surface image data and exhibits an error of approximately 1.5E−12 m^(2)/*** results suggest the applicability of proposed model to the field of facility maintenance for estimating the chloride ion diffusion coefficient of concrete using images.

关键词： Chloride ion diffusion coefficient convolutional neural network deep learning

Fingerprint inspired advanced end-effector and its applications

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Friction 2022年第10期10卷 1739-1750页

作者： Sung Ho lee hyo Sung KIM Han Jun PARK Moon Kyu KWAK Department of Electrical Engineering and Computer Science University of MichiganAnn Arbor 48109USA Department of Mechanical Engineering Kyungpook National UniversityDaegu 41566Republic of Korea

The human fingertip consists of a fingerprint with many micro-grating *** main roles of the fingerprint could be divided into two purposes,namely,the enhancement of the frictional force and the effective transmittance of the *** this study,we present the fingerprint-inspired end-effector that has not only admirable frictional force but also electric *** end-effector is composed of fluorocarbon rubber,one of the famous materials to achieve high frictional force and *** various experiments,the novel performance of micro structured fluorocarbon rubber end-effector(MSFE)is characterized by comparing with a macroscale patterned sample(MPS),which has been already used in real industrial *** results are analyzed ***,as feasible applications,we suggest two applications based on the role of the *** is the conductive astronaut glove with high frictional force,and the other one is a non-slip pad for the next-generation glass transfer *** these experiments,we successfully observe the enhanced system performance and confirm the possibility of using the MSFE as feasible *** believe that the MSFE could be a useful and powerful alternative as an end-effector,not only in the aerospace industry but also in display manufacturing processes.

关键词： fingerprint end-effector fluorocarbon rubber(FKM) glass transfer system spacesuit

Crown Fuel Characteristics and Carbon Emission from Japanese Red Pine Stands Burned by Crown Fire in Mt. Palgong, South Korea

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Journal of Mountain Science 2012年第5期9卷 656-664页

作者： Byungdoo lee Myoung Soo won Yohan lee Myung Bo lee Division of Forest Disaster Management Korea Forest Research Institute College of Forestry Oregon State University

Carbon emissions from forest fires are considered an important factor of ecosystem carbon balance and global climate change. Carbon emissions from Japanese red pine stands （Pinus densiflora S. et Z.） burned by crown fire were estimated at Mt. Palgong in Daegu Metropolitan City, and crown fuel characteristics, including crown bulk density, crown base height, and fuel moisture content of Japanese red pine, were analyzed. Total biomass combusted was calculated by subtracting the biomass of burned stands from that of unburned stands exhibiting similar stand structures and site environments. Ten trees in the unburned area and five trees in the burned area were cut by using direct harvesting techniques to estimate crown layer biomass. All biomass sampled was oven-dried and weighed. The dry weight ratios of stems, branches, and needles were 7o%, 21%, and 9%, respectively. The available fuel load susceptible to combustion during the crown fire spread was equivalent to 55% of the crown layer biomass. The crown bulk density was 0.24 kg/m3 on average. The estimated amount of CO2 was 23,454 kg CO2/ha for the crown layer. These results will be useful for calculating the amount of CO2 emitted from forest fires and for developing a forest carbon model in P. densiflora forests.

关键词： Biomass burning Crown fire Fuelcharacteristics Bulk density Pinus densiflora

Deep Learning Approach for Cosmetic Product Detection and Classification

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Computers, Materials & Continua 2021年第10期69卷 713-725页

作者： Se-won Kim Sang-Woong lee Department of IT Convergence Engineering Gachon UniversitySeongnam13120Korea Department of Software Gachon UniversitySeongnam13120Korea

As the amount of online video content is increasing,consumers are becoming increasingly interested in various product names appearing in videos,particularly in cosmetic-product names in videos related to fashion,beauty,and ***,the identification of such products by using image recognition technology may aid in the identification of current commercial *** this paper,we propose a two-stage deep-learning detection and classification method for cosmetic ***,variants of the YOLO network are used for detection,where the bounding box for each given input product is predicted and subsequently cropped for *** use four state-of-the-art classification networks,namely ResNet,InceptionResNetV2,DenseNet,and EfficientNet,and compare their ***,we employ dilated convolution in these networks to obtain better feature representations and improve *** experiments demonstrate that YOLOv3 and its tiny version achieve higher speed and ***,the dilated networks marginally outperform the base models,or achieve similar performance in the worst *** conclude that the proposed method can effectively detect and classify cosmetic products.

关键词： Cosmetic product detection cosmetic product classification deep learning

Regular truss structure model equivalent to continuum structure

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International Journal of Agricultural and Biological Engineering 2015年第5期8卷 151-161页

作者： won Choi JeongJae lee Seongsoo Yoon Department of Rural Systems Engineering College of Agriculture and Life SciencesSeoul National UniversitySeoul 151-921South Korea Department of Rural Systems Engineering Research Institute of Agriculture and Life SciencesCollege of Agriculture and Life SciencesSeoul National UniversitySeoul 151-921South Korea Department.of Agricultural and Rural Engineering College of AgricultureLife and Environments SciencesChungbuk National UniversityChungbuk 362-763South Korea

It is difficult to solve the structural problems related to agricultural engineering,due to the wide ranges of the means of related variables and complex structural *** these reasons,discrete models are required that are able to replace or simplify solid structure components used in traditional analysis ***,the objective of this study was to develop a regular truss structure model that behaves the same way as a solid *** was assumed that if a unit element consists of truss elements with each hinge at the end of the element and the size of the element is infinitesimal,the stress distribution and displacement field will be constant throughout the domain of the unit ***,the behavior of the truss element was assumed to be in a linear state in a two-dimensional *** law of energy conservation,based on the theory of elasticity,was applied to determine the equilibrium conditions between discretized and solid *** restrictive condition that we obtained revealed that applications are limited to only ideal elastic materials with a Poisson’s ratio of 1 to *** volumetric ratio of the equivalent truss to the continuum structures was 3:1,regardless of the size or number of the *** calculate the internal stress and strain of the unit element,the geometric relationships of each truss member,which has its own role against different stress directions,were *** calculated von Misses stresses were used to verify this *** concentrations,as explained based on Saint Venant’s principle,were also observed in the equivalent truss structure *** main stress paths,indicating the areas where reinforcement bars should be placed,were successfully shown without the requirement that each element be transformed in the direction of principal stress;this was done by eliminating elements with only compressive and near-zero stresses.

关键词： structural analysis regular mesh equivalent truss structure model discretized element energy method

Thermal-environment characteristics and comfort of combined radiant-floor (Korean heating system ondol) and convective cooling system

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Journal of Central South University 2013年第12期20卷 3589-3603页

作者： lee Kang-Guk HONG won-Hwa School of Architecture Kyungpook National University

The thermal-environment characteristics of the existing forced-convection cooling system were compared with those of the convective cooling system, which combined the radiant-floor cooling system using floor-heating panel typically applied to apartments in South Korea with the forced-convection cooling system using improved fan coil unit. The subjective warm/cool-feeling responses to the combined radiant-floor and convective cooling system in the questionnaire survey conducted among the test subjects were analyzed to establish the basic data for the combined cooling system. The results show that in the thermal-equilibrium condition, the vertical air temperature difference in the model living room is larger in the forced-convection-cooling condition. Most of the subjects feel a proper warm/cool feeling on their entire body, but they feel colder on the foot and lower body in the combined-cooling condition.

关键词： convection cooling temperature ondol thermal comfort fan coil unit combined cooling system

Clean-DM1, a Korean Polyherbal Formula, Improves High Fat Diet-Induced Diabetic Symptoms in Mice by Regulating IRS/PI3K/AKT and AMPK Expressionsin Pancreas and Liver Tissues

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Chinese Journal of Integrative Medicine 2024年第2期30卷 125-134页

作者： Piao Wang Yi Liu Seok Yong Kang Chenzi Lyu Xiang Han Tianjun Ho Kyung Jae lee Xianglong Meng Yong-Ki Park hyo won Jung Department of Herbology College of Korean MedicineDongguk UniversityGyeongju 38066Korea College of Pharmacy&Graduate School of Pharmaceutical Sciences Ewha Womans UniversitySeoul 03760Korea Korean Medicine R&D Center Dongguk UniversityGyeongju 38066Korea Shanxi Key Laboratory of Traditional Herbal Medicines Processing Shanxi University of Chinese MedicineJinzhong(030619)ShanxiProvinceChina

Objective:To investigate the effects of Clean-DM1(C-DM1),a polyherbal formulation of Radix Scrophulariae,Radix Astragali,Rhizoma Atractylodis,and Radix Salviae Miltiorrhizae,on high-fat diet(HFD)-induced diabetes ***:The information about active components of C-DM1 extract and molecular mechanism was obtained from network pharmacology *** compounds of C-DM1 extract by high performance liquid chromatography-mass spectrometry(HPLC-MS)analysis were conducted for quality *** in vivo study,mice were induced diabetes by HFD for 12 *** mice in the normal group(Nor)were maintained with a regular diet and treated with saline by *** HFD model mice were randomly divided into 3 groups,including a HFD diabetic model group,a C-DM1 extract-administered group(C-DM1,500 mg/kg),and metformin-administered groups(Met,500 mg/kg),8 mice in each *** intake,body weight(BW),and fasting blood glucose(FBG)levels were recorded weekly for 4 *** 4 weeks of treatment,alanine aminotransferase(ALT),aspartate aminotransferase(AST),blood glucose,low-density lipoprotein cholesterol(LDL-C)were determined using an automated clinical chemistry analyzer,and homeostatic model for assessing insulin resistance(HOMA-IR)levels and oral glucose tolerance test(OGTT)were *** histopathological changes of liver and pancreatic tissues were observed by hematoxylin-eosin *** receptor substrate(IRS)/phosphatidylinositol 3 kinase(PI3K)/protein kinase B(AKT)and adenosine 5'-monophosphate-activated protein kinase(AMPK)expressions in liver and pancreas tissues were detected by Western blot ***:HPLC-MS identified dihydroisotanshinone,dihydroisotanshinone I,cryptotanshinone,harpagoside,and atractyloside A in C-DM1 *** administration of C-DM1 extract significantly decreased body weight,calorie intake,and the levels of blood glucose and insulin in the diabetic mice(P<0.05 or P<0.01).The C-DM1 extract administration improved the im

关键词： high-fat diet type 2 diabetes mellitus herbal formulation insulin receptor substrate/phosphatidylinositol 3 kinase/protein kinase B adenosine 5'-monophosphate-activated protein kinase network pharmacology high performance liquid chromatography-mass spectrometry analysis