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Enhancement of ballistic performance enabled by transformation-induced plasticity in high-strength bainitic steel

Journal of Materials Science & Technology 2021年第25期84卷 219-229页

作者： Min Cheoljo Selim kim Dong Woo suh Hong Kyu kim Yongjin kim Seok su Sohn sunghak Lee Center for Advanced Aerospace Materials Pohang University of Science and TechnologyPohang37673South Korea Graduate Institute of Ferrous Technology Pohang University of Science and TechnologyPohang37673South Korea Materials Directorate Agency for Defense DevelopmentDaejeon305-600South Korea Department of Materials Science and Engineering Korea UniversitySeoul02841South Korea

High-strength bainitic steels have created a lot of interest in recent times because of their excellent combination of strength,ductility,toughness,and high ballistic mass *** steels have great potential in the fabrication of steel armor *** various approaches and methods have been conducted to utilize the retained austenite(RA)in the bainitic matrix to control mechanical properties,very few attempts have been conducted to improve ballistic performance utilizing transformationinduced plasticity(TRIP)*** this study,high-strength bainitic steels were designed by controlling the time of austempering process to have various volume fractions and stability of RA while maintaining high *** dynamic compressive and ballistic impact tests were conducted,and the relation between the effects of TRIP on ballistic performance and the adiabatic shear band(ASB)formation was *** results show for the first time that an active TRIP mechanism achieved from a large quantity of metastable RA can significantly enhance the ballistic performance of high-strength bainitic steels because of the improved resistance to ASB ***,the ballistic performance can be effectively improved by a very short austempering time,which suggests that the utilization of active TRIP behavior via tuning RA acts as a primary mechanism for significantly enhancing the ballistic performance of high-strength bainitic steels.

关键词： High-strength bainitic steel Ballistic performance Split Hopkinson pressure bar(SHPB) Adiabatic shear band(ASB) Retained austenite(RA) Transformation-induced plasticity(TRIP)

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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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Adverse events related to colonoscopy: Global trends and future challenges

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World Journal of Gastroenterology 2019年第2期25卷 190-204页

作者： su Young kim Hyun-Soo kim Hong Jun Park Department of Internal Medicine Yonsei University Wonju College of Medicine

Colonoscopy is a widely used method for diagnosing and treating colonic disease. The number of colonoscopies is increasing worldwide, and concerns about associated adverse events are growing. Large-scale studies using big data for post-colonoscopy complications have been reported. A colon perforation is a severe complication with a relatively high mortality rate. The perforation rate, as reported in large studies(≥ 50,000 colonoscopies) published since 2000, ranges from 0.005-0.085%. The trend in the overall perforation rate in the past 15 years has not changed significantly. Bleeding is a more common adverse event than perforation. Recent large studies(≥ 50,000 colonoscopies) have reported postcolonoscopy bleeding occurring in 0.001-0.687% of cases. Most studies about adverse events related to colonoscopy were performed in the West, and relatively few studies have been conducted in the East. The incidence of post-colonoscopy complications increases in elderly patients or patients with inflammatory bowel diseases. It is important to use a unified definition and refined data to overcome the limitations of previous studies. In addition, a structured training program for endoscopists and a systematic national management program are needed to reduce post-colonoscopy complications. In this review, we discuss the current trends in colonoscopy related to adverse events, as well as the challenges to be addressed through future research.

关键词： Colonoscopy Adverse events Perforation Bleeding Post-colonoscopy

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Optimal proximal resection margin distance for gastrectomy in advanced gastric cancer

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World Journal of Gastroenterology 2020年第18期26卷 2232-2246页

作者： Amy kim Beom su kim Jeong Hwan Yook Byung Sik kim Division of Stomach surgery Department of SurgeryAsan Medical CenterUniversity of Ulsan College of MedicineSeoul 05505South Korea Department of surgery Korea University Medical Center Ansan HospitalAnsanGyeonggi-do 15355South Korea

BACKGROUND The conventional guidelines to obtain a safe proximal resection margin(PRM)of5-6 cm during advanced gastric cancer(AGC)surgery are still applied by many surgeons across the *** recent studies have raised questions regarding the need for such extensive resection,but without reaching *** study was designed to prove that the PRM distance does not affect the prognosis of patients who undergo gastrectomy for *** To investigate the influence of the PRM distance on the prognosis of patients who underwent gastrectomy for *** Electronic medical records of 1518 patients who underwent curative gastrectomy for AGC between June 2004 and December 2007 at Asan Medical Center,a tertiary care center in Korea,were reviewed retrospectively for the *** demographics and clinicopathologic outcomes were compared between patients who underwent surgery with different PRM distances using one-way ANOVA and Fisher’s exact test for continuous and categorical variables,*** influence of PRM on recurrence-free survival and overall survival were analyzed using Kaplan-Meier survival analysis and Cox proportional hazard *** The median PRM distance was 4.8 cm and 3.5 cm in the distal gastrectomy(DG)and total gastrectomy(TG)groups,*** cohorts in the DG and TG groups were subdivided into different groups according to the PRM distance;≤1.0 cm,1.1-3.0 cm,3.1-5.0 cm and>5.0 *** DG and TG groups showed nostatistical difference in recurrence rate(23.5%vs 30.6%vs 24.0%vs 24.7%,P=0.765)or local recurrence rate(5.9%vs 6.5%vs 8.4%vs 6.2%,P=0.727)according to the distance of *** both groups,Kalpan-Meier analysis showed no statistical difference in recurrence-free survival(P=0.467 in DG group;P=0.155 in TG group)or overall survival(P=0.503 in DG group;P=0.155 in TG group)according to the PRM *** analysis using Cox proportional hazard model revealed that in both groups,there was no significant differ

关键词： Stomach neoplasms Gastrectomy Margins of excision Prognosis Recurrence

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Optical shaping of the polarization anisotropy in a laterally coupled quantum dot dimer

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Light(Science & Applications) 2020年第1期9卷 1047-1056页

作者： Heedae kim Kwangseuk Kyhm Robert A.Taylor Jong su kim Jin Dong Song sungkyun Park School of Physics Northeast Normal University130024 ChangchunChina Clarendon Laboratory Department of PhysicsUniversity of OxfordOxford OX13PUUK Department of Opto-mechatronics Pusan Nat’l UniversityBusan 609-735Republic of Korea Department of Physics Yeungnam UniversityGyeongsan 712-749Republic of Korea Nano-Photonics Research Center KISTSeoul 136-791Republic of Korea Department of Physics Pusan Nat’l UniversityBusan 609-735Republic of Korea

We find that the emission from laterally coupled quantum dots is strongly polarized along the coupled direction[110],and its polarization anisotropy can be shaped by changing the orientation of the polarized *** the nonresonant excitation is linearly polarized perpendicular to the coupled direction[110],excitons(X_(1) and X_(2))and local biexcitons(X_(1)X_(1) and X_(2)X_(2))from the two separate quantum dots(QD_(1) and QD_(2))show emission anisotropy with a small degree of polarization(10%).On the other hand,when the excitation polarization is parallel to the coupled direction [110],the polarization anisotropy of excitons,local biexcitons,and coupled biexcitons(X_(1)X_(2))is enhanced with a degree of polarization of 74%.We also observed a consistent anisotropy in the time-resolved *** decay rate of the polarized photoluminescence intensity along the coupled direction is relatively high,but the anisotropic decay rate can be modified by changing the orientation of the polarized *** energy difference is also observed between the polarized emission spectra parallel and perpendicular to the coupled direction,and it increases by up to three times by changing the excitation polarization orientation from [110] to [110].These results suggest that the dipole-dipole interaction across the two separate quantum dots is mediated and that the anisotropic wavefunctions of the excitons and biexcitons are shaped by the excitation polarization.

关键词： anisotropy quantum polarized

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A Unified Buffering Management with Set Divisible Cache for PCM Main Memory

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Journal of Computer Science & Technology 2016年第1期31卷 137-146页

作者： Mei-Ying Bian su-Kyung Yoon Jeong-Geun kim Sangjae Nam Shin-Dug kim Department of Computer Science Yonsei University Seoul 120-749 Korea

This research proposes a phase-change memory （PCM） based main memory system with an effective combi- nation of a superblock-based adaptive buffering structure and its associated set divisible last-level cache （LLC）. To achieve high performance similar to that of dynamic random-access memory （DRAM） based main memory, the superblock-based adaptive buffer （SABU） is comprised of dual DRAM buffers, i.e., an aggressive superblock-based pre-fetching buffer （SBPB） and an adaptive sub-block reusing buffer （SBRB）, and a set divisible LLC based on a cache space optimization scheme. According to our experiment, the longer PCM access latency can typically be hidden using our proposed SABU, which can significantly reduce the number of writes over the PCM main memory by 26.44%. The SABU approach can reduce PCM access latency up to 0.43 times, compared with conventional DRAM main memory. Meanwhile, the average memory energy consumption can be reduced by 19.7%.

关键词： memory hierarchy memory structure,cache memory buffer management

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Electrochemical characteristics of stainless steel using impressed current cathodic protection in seawater

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中国有色金属学会会刊：英文版 2009年第4期19卷 930-934页

作者： Seok-Ki JANG Min-su HAN Seong-Jong kim Division of Marine Engineering Mokpo Maritime University

Stainless steels such as STS 304,316 and 630 are frequently used as shaft materials in small fiber reinforced polymer(FRP) fishing *** the shaft material is exposed to a severely corrosive environment such as seawater,it should be protected using appropriate *** impressed current cathodic protection was used to inhibit corrosion in shaft *** anodic polarization,passivity was remarkably more evident in STS 316 stainless steel than in STS 304 and STS *** pitting potentials of STS 304,316,and 630 stainless steels were 0.30,0.323,and 0.260 V,*** concentration polarization due to oxygen reduction and activation polarization due to hydrogen generation were evident in the cathodic polarization trends of all three stainless *** 316 had the lowest current densities in all potential ranges,and STS 630 had the *** analysis showed that STS 316 was the most noble in the *** addition,the corrosion current density was the lowest for STS 316.

关键词：外加电流阴极保护 316不锈钢电化学特性海水腐蚀电流密度材料腐蚀阳极极化 STS

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Reconfigurable Sensing Time in Cooperative Cognitive Network Using Machine Learning

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Computers, Materials & Continua 2023年第3期74卷 5209-5227页

作者： Noor Gul Saeed Ahmed su Min kim Muhammad Sajjad Khan Junsu kim Department of Electronics Engineering Korea Polytechnic UniversityGyeonggi-do15073Korea Department of Electronics University of PeshawarPeshawar25120Pakistan Deparment of Electrical Engineering Mirpur University of Science of TechnologyAJ&KMirpur10250Pakistan Department of Electrical Engineering International Islamic UniversityIslamabad44000Pakistan

A cognitive radio network(CRN)intelligently utilizes the available spectral resources by sensing and learning from the radio environment to maximize spectrum *** CRNs,the secondary users(sus)opportunistically access the primary users(PUs)***,unambiguous detection of the PU channel occupancy is the most critical aspect of the operations of *** spectrum sensing(CSS)is rated as the best choice for making reliable sensing *** paper employs machinelearning tools to sense the PU channels reliably in *** sensing parameters are reconfigured to maximize the spectrum utilization while reducing sensing error and cost with improved channel *** fine-k-nearest neighbor algorithm(FKNN),employed in this paper,estimates the number of samples based on the nature of the channel under-specific detection and false alarm probability *** simulation results reveal that the sensing cost is suppressed by reducing the sensing time and exploiting the traditional fusion rules,validating the effectiveness of the proposed ***,the global decision made at the fusion center(FC)based on the modified sensing samples,results low energy consumption,higher throughput,and improved detection with low error probabilities.

关键词： Energy detection machine learning k-nearest-neighbor decision tree linear regression throughput energy consumption

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Anti-inflammatory Effects of Sanguisorbae Radix on Contact Dermatitis Induced by Dinitrofluorobenzene in Mice

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Chinese Journal of Integrative Medicine 2020年第9期26卷 688-693页

作者： suzy Jo Junghyun Ryu Hanna kim Miyoung kim Mi Heon Ryu Hyungwoo kim su-ln Cho School of Korean Medicine Pusan National UniversityPusan(626-870)Republic of Korea School of Dentistry Pusan National UniversityPusan(626-870)Republic of Korea

Objective:To investigate the anti-inflammatory effects of Sanguisorbae Radix on contact dermatitis(CD).Methods:Mice were sensitized by painting 30μL of 1-fluoro-2,4-dinitrofluorobenzene(DNFB)onto each ear for 3 *** days later,mice were challenged by painting with 50μL of DNFB onto the shaved dorsum every 2 *** Radix methanol extract(MESR)was applied onto the shaved dorsum every 2 *** effects of MESR on skin thickness,skin weights,histopathological changes,skin lesions and cytokine production in DNFB-induced CD mice were investigated,as well as its effects on body weights and spleen/body weight ***:Topical application of MESR effectively inhibited enlargement of skin thickness and weight(Psues and improved lesions on dorsum skin in CD ***,treatment with MESR suppressed the increase in the levels of tumor necrosis factor α(TNF-α,Psuggest that MESR acts as an anti-inflammatory agent that decreases the production of TNF-α and IFN-γ,resulting in reductions of skin lesions and histopathological changes in inflamed skin tissues.

关键词： Sanguisorba officinalis skin diseases herbal Chinese materia medica

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Examining global warming factors using self-organizing map and Granger causality network:a case from South Korea

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Ecological Processes 2023年第1期12卷 140-150页

作者： Thakur Dhakal Tae-su kim Do-Hun Lee Gab-sue Jang Department of Life Science Yeungnam UniversityGyeongsan 38541Republic of Korea National Institute of Ecology Seocheon 33657Republic of Korea

Background Understanding and patterning the possible causal variables of global warming is attributed to the development of effective prevention and mitigation strategies for climate ***,we aimed to pattern and visualize the possible causal variables of global warming and measure the causality between *** We patterned and visualized the time series(103 years,from 1918 to 2020)of global surface temperature(GTemp)data with the gross domestic product(GDP)per capita,human population(Pop),and carbon dioxide(CO_(2))emissions of South Korea using a self-organizing map(SOM)and examined the causable local feature of global warming using the Granger causality(GC)*** time-series data were trained and mapped in 4×4 SOM grids,and causality networks between variables were examined using multivariate Granger test *** SOM patterned 103 years of data,and a dominant cluster contained continuous time-series data from 2007 to ***,the CO_(2)emissions of South Korea were obtained as a predictable unidirectional causal variable for GTemp from GC *** on data from the past 34 years,significant causality(p-value=0.01)was observed with the integrated effect of Pop,GDP,and CO_(2)on *** This study patterned the time-series data using SOM and examined the causal relationship between variables using the GC *** study framework could be used as a reference by future scholars,ecologists,and the United Nations sustainable Development Goals.

关键词： Climate change Ecology Self-organizing map sustainable development goal Greenhouse gas

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