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Weak and Strong Convergence for Fixed Points of Asymptotically Non-expansive Mappings

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Acta Mathematica Sinica,English Series 2004年第6期20卷 1009-1018页

作者： Ze Qing LIU shin min kang Department of Mathematics Liaoning Normal University Department of Mathematics and Research Institute of Natural Science Gyeongsang National University

A few weak and strong convergence theorems of the modified three-step iterative sequence with errors and the modified Ishikawa iterative sequence with errors for asymptotically non-expansive mappings in any non-empty closed convex subsets of uniformly convex Banach spaces are established. The results presented in this paper substantially extend the results due to Chang (2001), Osilike and Aniagbosor (2000), Rhoades (1994) and Schu (1991).

关键词： Asymptotically non-expansive mapping Fixed point Modified three-step iterative sequence with errors Modified Ishikawa iterative sequence with errors Uniformly convex Banach space Opial’s condition Weak convergence Strong convergence

APPROXIMATION OF COMMON SOLUTIONS OF VARIATIONAL INEQUALITIES VIA STRICT PSEUDOCONTRACTIONS

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Acta Mathematica Scientia 2012年第4期32卷 1607-1618页

作者： Sun Young Cho shin min kang Department of Mathematics and RINS Gyeongsang National UniversityJinju 660-701 Korea

In this paper, a convex feasibility problem is considered. We construct an iterative method to approximate a common element of the solution set of classical variational inequalities and of the fixed point set of a strict pseudocontraction. Strong convergence theorems for the common element are established in the framework of Hilbert spaces.

关键词： fixed point inverse-strongly monotone mapping nonexpansive mapping variational inequality

Technical advances in external radiotherapy for hepatocellular carcinoma

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World Journal of Gastroenterology 2016年第32期22卷 7311-7321页

作者： shin-Hyung Park Jae-Chul Kim min Kyu kang Department of Radiation Oncology Kyungpook National University Hospital Department of Radiation Oncology Kyungpook National University School of Medicine

Radiotherapy techniques have substantially improved in the last two decades. After the introduction of 3-dimensional conformal radiotherapy, radiotherapy has been increasingly used for the treatment of hepatocellular carcinoma(HCC). Currently, more advanced techniques, including intensity-modulated radiotherapy(IMRT), stereotactic ablative body radiotherapy(SABR), and charged particle therapy, are used for the treatment of HCC. IMRT can escalate the tumor dose while sparing the normal tissue even though the tumor is large or located near critical organs. SABR can deliver a very high radiation dose to small HCCs in a few fractions, leading to high local control rates of 84%-100%. Various advanced imaging modalities are used for radiotherapy planning and delivery to improve the precision of radiotherapy. These advanced techniques enable the delivery of high dose radiotherapy for early to advanced HCCs without increasing the radiation-induced toxicities. However, as there have been no effective tools for the prediction of the response to radiotherapy or recurrences within or outside the radiation field, future studies should focus on selecting the patients who will benefit from radiotherapy.

关键词： Hepatocellular carcinoma Radiotherapy 3D-conformal Radiotherapy Intensity-modulated Radiotherapy stereotactic ablative body Radiotherapy Charged particle therapy Image-guided Radiotherapy

Synthesis and properties of Cr-Al-Si-N films deposited by hybrid coating system with high power impulse magnetron sputtering (HIPIMS) and DC pulse sputtering

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中国有色金属学会会刊：英文版 2012年第S3期22卷 729-734页

作者： min Su kang Tie-gang WANG Jung Ho shin Roman NOWAK Kwang Ho KIM School of Materials Science and Engineering Pusan National University State Key Laboratory of Corrosion and Protection Institute of Metal ResearchChinese Academy of Sciences National Core Research Center for Hybrid Materials Solution Pusan National University Extreme Energy-Density Research Institute Nagaoka University of Technology School of Chemical Technology Aalto University

The CrN and Cr-Al-Si-N films were deposited on Si wafer and SUS 304 substrates by a hybrid coating system with high power impulse magnetron sputtering (HIPIMS) and a DC pulse sputtering using Cr and AlSi targets under N2/Ar *** varying the sputtering current of the AlSi target in the range of 0-2.5 A,both the Al and Si contents in the films increased gradually from 0 to 19.1% and 11.1% (mole fraction),*** influences of the AlSi cathode DC pulse current on the microstructure,phase constituents,mechanical properties,and oxidation behaviors of the Cr-Al-Si-N films were investigated *** results indicate that the as-deposited Cr-Al-Si-N films possess the typical nanocomposite structure,namely the face centered cubic (Cr,Al)N nano-crystallites are embedded in the amorphous Si3N4 *** increasing the Al and Si contents,the hardness of the film first increases from 20.8 GPa for the CrN film to the peak value of 29.4 GPa for the Cr0.23Al0.14Si0.07 N film,and then decreases *** the meanwhile,the Cr0.23Al0.14Si0.07N film also possesses excellent high-temperature oxidation resistance that is much better than that of the CrN film at 900 or 1000 °C.

关键词： Cr-Al-Si-N film high power impulse magnetron sputtering DC pulsed sputtering high-temperature oxidation resistance

Numerical simulation for thermal response test performance in closed-loop vertical ground heat exchanger

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Science China(Technological Sciences) 2011年第7期54卷 1668-1673页

作者： CHOI Jong min LEE Chulho PARK Moonseo kang shin-Hyung CHOI Hangseok Department of Mechanical Engineering Hanbat National University School of Civil Environmental and Architectural Engineering Korea University Department of Mechanical Engineering Konyang University

In this study, a series of numerical analyses was performed in order to evaluate the performance of full-scale closed-loop vertical ground heat exchangers constructed in Wonju, South Korea. The circulating HDPE pipe, borehole and surrounding ground formation were modeled using FLUENT, a finite-volume method (FVM) program, for analyzing the heat transfer process of the ground heat exchanger system. Two user-defined functions (UDFs) accounting for the difference in the temperature of the circulating inflow and outflow fluid and the variation of ground temperature with depth were adopted in the FLUENT modeling. The thermal conductivities of grouts (cement vs. bentonite) measured in laboratory were used as input values in the numerical analyses to compare the thermal efficiency of the cement and bentonite grouts used for installing the closed-loop vertical ground heat exchanger. A series of numerical analyses was carried out to simulate in-situ thermal response tests performed in the construction site. From the comparison between the in-situ thermal response test results and numerical simulations, the average thermal conductivity of the ground formation in the construction site is back-calculated as approximately 4 W/mK. This value can be used in evaluating the long-term performance of the closed-loop vertical ground heat ex changer.

关键词： closed-loop vertical ground heat exchanger cement grout bentonite grout in-situ thermal response test finite-volumemethod thermal conductivity

Superior electrocatalytic negative electrode with tailored nitrogen functional group for vanadium redox flow battery

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Journal of Energy Chemistry 2023年第3期78卷 148-157,I0005页

作者： min Gu kang Wook Ahn Joonhee kang shin Ae Song Kiyoung Kim Ju Young Woo Yong-Cheol Jeong Bonwook Koo Dae Soo Jung Sung Nam Lim Micro/Nano Scale Manufacturing Group Korea Institute of Industrial Technology143 HanggaulroSangrok-guAnsan-siGyeonggi-do 15588Republic of Korea Department of Energy Systems Engineering Soonchunhyang University22 Soonchunhyang-roShinchang-myeonAsan-siChungcheongnam-do 31538Republic of Korea Department of Nanoenergy Engineering Pusan National UniversityBusan 46241Republic of Korea Department of Nano Fusion Technology Pusan National UniversityBusan 46241Republic of Korea Energy Storage Materials Center Energy&Environmental DivisionKorea Institute of Ceramic Engineering&Technology(KICET)101 Soho-roJinju-siGyeongsangnam-doRepublic of Korea

Development of electrodes with high electrocatalytic activity and stability is essential for solving problems that still restrict the extensive application of vanadium redox flow batteries(VRFBs).Here,we designed a novel negative electrode with superior electrocatalytic activity by tailoring nitrogen functional groups,such as newly formed nitro and pyridinic-N transformed to pyridonic-N,from the prenitrogen-doped *** was experimentally confirmed that an electrode with pyridonic-N and nitro fuctional groups(tailored nitrogen-doped graphite felt,TNGF) has superior electrocatalytic acivity with enhanced electron and mass *** functional theory calulations demonstrated the pyridonic-N and nitro functional groups promoted the adsorption,charge transfer,and bond formation with the vanadium species,which is consistent with expermental *** addition,the V2+/V3+redox reaction mechanism on pyridonic-N and nitro functional groups was estabilised based on density functional theory(DFT) *** TNGF was applied to a VRFB,it enabled enhanced-electrolyte utilization and energy efficiencies(EE) of 57.9% and 64.6%,respectively,at a current density of 250 mA cm^(-2).These results are 18.6% and 8.9% higher than those of VRFB with electrode containing graphitic-N and pyridinicN ***,TNGF-based VRFB still operated with an EE of 59% at a high current density of300 mA cm^(-2).The TNGF-based VRFB exhibited stable cycling performance without noticeable decay of EE over 450 charge-discharge cycles at a current density of 250 mA cm^(-2).The results of this study suggest that introducing pyridonic-N and nitro groups on the electrode is effective for improving the electrochemical performance of VRFBs.

关键词： Tailored nitrogen functional group Pyridonic-N Nitro Negative electrode Density functional theory Vanadium redoxﬂow batteries

Activation or exhaustion of CD8^(+) T cells in patients with COVID-19

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Cellular & Molecular Immunology 2021年第10期18卷 2325-2333页

作者： min-Seok Rha Eui-Cheol shin Laboratory of Immunology and Infectious Diseases Graduate School of Medical Science and EngineeringKorea Advanced Institute of Science and Technology(KAIST)DaejeonRepublic of Korea Department of Otorhinolaryngology Yonsei University College of MedicineSeoulRepublic of Korea.3 The Center for Epidemic PreparednessKAISTDaejeonRepublic of Korea

In addition to CD4^(+)T cells and neutralizing antibodies,CD8^(+)T cells contribute to protective immune responses against SARS-CoV-2 in patients with coronavirus disease 2019(COVID-19),an ongoing pandemic *** patients with COVID-19,CD8^(+)T cells exhibiting activated phenotypes are commonly observed,although the absolute number of CD8^(+)T cells is *** addition,several studies have reported an upregulation of inhibitory immune checkpoint receptors,such as PD-1,and the expression of exhaustion-associated gene signatures in CD8^(+)T cells from patients with ***,whether CD8^(+)T cells are truly exhausted during COVID-19 has been a controversial *** the present review,we summarize the current understanding of CD8^(+)T-cell exhaustion and describe the available knowledge on the phenotypes and functions of CD8^(+)T cells in the context of activation and *** also summarize recent reports regarding phenotypical and functional analyses of SARS-CoV-2-specific CD8^(+)T cells and discuss long-term SARS-CoV-2-specific CD8^(+)T-cell memory.

关键词： CD8^(+)T cell Activation T-cell exhaustion SARS-CoV-2 COVID-19

Weight gain after 35 years of age is associated with increased breast cancer risk: findings from a large prospective cohort study

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Cancer Biology & Medicine 2024年第8期21卷 651-655页

作者： Katherine De la Torre Woo-Kyoung shin Hwi-Won Lee Dan Huang Sukhong min Aesun shin Wonshik Han Daehee kang Department of Preventive Medicine Seoul National University College of MedicineSeoul 03080Republic of Korea Department of Biomedical Sciences Seoul National University Graduate SchoolSeoul 03080Republic of Korea Division of Food and Pharmaceutical Technology Mokwon UniversityDaejeon 35349Republic of Korea Integrated Major in Innovative Medical Science Seoul National University Graduate SchoolSeoul 03080Republic of Korea Cancer Research Institute Seoul National UniversitySeoul 03080Republic of Korea Department of Surgery Seoul National University College of MedicineSeoul 03080Republic of Korea Biomedical Research Institute Seoul National University HospitalSeoul 03080Republicof Korea

Adiposity affects lifetime estrogen exposure,which is a key factor in breast ***,adiposity effects,often assessed as the body mass index(BMI),on pre-and post-menopausal breast cancer risk are *** weight gain may reflect body fat mass accumulation during adulthood better than the BMI,potentially representing age-related metabolic changes.

关键词： breast cancer assessed

Effects of Supercritical Environment on Hydrocarbon-fuel Injection

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Journal of Thermal Science 2017年第2期26卷 183-191页

作者： Bongchul shin Dohun Kim min Son Jaye Koo Graduate School Korea Aerospace UniversityGoyangRepublic of Korea School of Aerospace and Mechanical Engineering Korea Aerospace UniversityGoyangRepublic of Korea

In this study, the effects of environment conditions on decane were investigated. Decane was injected in subcritical and supercritical ambient conditions. The visualization chamber was pressurized to 1.68 MPa by using nitrogen gas at a temperature of 653 K for subcritical ambient conditions. For supercritical ambient conditions, the visualization chamber was pressurized to 2.52 MPa by using helium at a temperature of 653 K. The decane injection in the pressurized chamber was visualized via a shadowgraph technique and gradient images were obtained by a post processing method. A large variation in density gradient was observed at jet interface in the case of subcritical injection in subcritical ambient conditions. Conversely, for supercritical injection in supercritical ambient conditions, a small density gradient was observed at the jet interface. In a manner similar to that observed in other cases, supercritical injection in subcritical ambient conditions differed from supercritical ambient conditions such as sphere shape liquid. Additionally, there were changes in the interface, and the supercritical injection core width was thicker than that in the subcritical injection. Furthermore, in cases with the same injection conditions, the change in the supercritical ambient normalized core width was smaller than the change in the subcritical ambient normalized core width owing to high specific heat at the supercritical injection and small phase change at the interface. Therefore, the interface was affected by the changing ambient condition. Given that the effect of changing the thermodynamic properties of propellants could be essential for a variable thrust rocket engine, the effects of the ambient conditions were investigated experimentally.

关键词： Decane Jet Subcritical Supercritical Visualization