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Min Men,Xin Ye,Weijun Fan,Kaixian Zhang,Jingwang Bi,Xia Yang,Aimin Zheng,Guanghui Huang,Zhigang Wei 대한영상의학회 2016 Korean Journal of Radiology Vol.17 No.6
Objective: To retrospectively evaluate the short-term outcomes and safety of computed tomography (CT)-guided percutaneous microwave ablation (MWA) of solitary adrenal metastasis from lung cancer. Materials and Methods: From May 2010 to April 2014, 31 patients with unilateral adrenal metastasis from lung cancer who were treated with CT-guided percutaneous MWA were enrolled. This study was conducted with approval from local Institutional Review Board. Clinical outcomes and complications of MWA were assessed. Results: Their tumors ranged from 1.5 to 5.4 cm in diameter. After a median follow-up period of 11.1 months, primary efficacy rate was 90.3% (28/31). Local tumor progression was detected in 7 (22.6%) of 31 cases. Their median overall survival time was 12 months. The 1-year overall survival rate was 44.3%. Median local tumor progression-free survival time was 9 months. Local tumor progression-free survival rate was 77.4%. Of 36 MWA sessions, two (5.6%) had major complications (hypertensive crisis). Conclusion: CT-guided percutaneous MWA may be fairly safe and effective for treating solitary adrenal metastasis from lung cancer.
Influence of hydrogen on incipient plasticity in CoCrFeMnNi high-entropy alloy
Yang, Guanghui,Zhao, Yakai,Lee, Dong-Hyun,Park, Jeong-Min,Seok, Moo-Young,Suh, Jin-Yoo,Ramamurty, Upadrasta,Jang, Jae-il Elsevier 2019 Scripta materialia Vol.161 No.-
<P><B>Abstract</B></P> <P>The influence of hydrogen on the onset of plastic deformation in a CoCrFeMnNi high-entropy alloy (HEA) was examined through the analysis of the load at which first pop-in during spherical nanoindentation experiments occurs on hydrogen-charged and subsequently aged specimens. Results reveal that the dissolved hydrogen lowers the plastic flow resistance, indicated by the shear yield strength, <I>τ</I> <SUB>y</SUB>, by modifying defect formation energies. Aging, subsequent to charging, leads to recovery of <I>τ</I> <SUB>y</SUB>, but only partially. The results are discussed in terms of the vacancy-mediated dislocation nucleation, which is supported by the estimated activation volume for deformation.</P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>
Hui Yu,Huashun Yu,Guanghui Min,박성수,Bong Sun You,Young Min Kim 대한금속·재료학회 2013 METALS AND MATERIALS International Vol.19 No.4
The hot deformation behavior of T4-treated ZK60 magnesium alloy was investigated in a compression test conducted with a thermo-mechanical simulator at a temperature range of 523 K to 673 K and a strain rate of 0.001 s−1 to 1 s−1. The results show that the flow stress increases as the deformation temperature decreases and the strain rate increases. Strain-dependent constitutive relationships were developed using regression method and artificial neural network, and good agreements between the experimentally measured values and the predicted ones were achieved. The work hardening analysis and onset of dynamic recrystallization (DRX) were investigated. The processing map reveals a domain of DRX at the temperature range of 620-673 K and strain rate range of 0.001-0.01 s−1, with its peak efficiency of 32% at 623 K and 0.001 s−1,which are the optimum values of the parameters for hot working of the T4-treated ZK60 alloy. The strain level has a great effect on the processing maps and lower temperatures and higher strain rates should be avoided during hot working processes. DRX model indicates that DRX of ZK60 alloy is controlled by the rate of nucleation, which is slower than the rate of migration.
Nano-graining a particle-strengthened high-entropy alloy
Lee, Dong-Hyun,Park, Jeong-Min,Yang, Guanghui,He, Junyang,Lu, Zhaoping,Suh, Jin-Yoo,Kawasaki, Megumi,Ramamurty, Upadrasta,Jang, Jae-il Elsevier 2019 Scripta materialia Vol.163 No.-
<P><B>Abstract</B></P> <P>The possibility of further enhancing the strength of a (CoCrFeNi)<SUB>94</SUB>Ti<SUB>2</SUB>Al<SUB>4</SUB> high-entropy alloy (HEA), which is already strengthened by Ni<SUB>3</SUB>(Ti,Al) second-phase particles, by grain refinement through high-pressure torsion (HPT) is examined. Concomitant with nanograin formation, HPT was found to induce particle dissolution and structural transformation of the remnant particles. Nanoindentation experiments of nanocrystalline HEA, with and without particles in the pre-HPT microstructure, suggests that grain boundary strengthening is the dominant strengthening mechanism.</P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>
Optimization of annealing treatment parameters in a twin roll cast and warm rolled ZK60 alloy sheet
Chen, Hongmei,Yu, Huashun,Kang, Suk Bong,Cho, Jae Hyoung,Min, Guanghui Elsevier 2010 Materials science & engineering. properties, micro Vol.527 No.4
<P><B>Abstract</B></P><P>The microstructure of twin roll cast and warm rolled ZK60 alloy sheet was investigated using OM and TEM technique after annealing treatment at the temperature ranging from 300°C to 400°C. Tensile test at room temperature was performed to show the influence of annealing treatment on mechanical properties. Static recrystallization (SRX) was observed during annealing treatment of ZK60 alloy sheet at and above 300°C. Shear bands, dislocations and twins play an important role during static recrystallization and serve as nucleation sites. Disc-shaped precipitates could be found in annealed ZK60 alloy sheet. Higher temperature annealing treatment resulted in higher density precipitates, and at this condition the dispersion strengthening particles improved the ability of resistance to softening at elevated temperature. Annealing treatment at 375°C for 10<SUP>3</SUP>s can be considered to be the optimum annealing treatment, and under this condition the tensile strength, yield strength and elongation are 388MPa, 301MPa and 22.9%, respectively.</P>
현명호,Chang Jin Boo,최희정,Yun Kyoung Kim,Bu Sung Kang,Hyun Ju Ha,Min Ki Choi,Guanghui Tan 대한화학회 2006 Bulletin of the Korean Chemical Society Vol.27 No.11
A new liquid chromatographic chiral stationary phase based on (2S,3S)-O,O'-bis-(10-undecenoyl)-N,N'-bis-(3,5-dinitrobenzoyl)-2,3-diamino-1,4-butandiol was prepared starting from (2R,3R)-1,4-bis(benzyloxy)-2,3-butanediol. The new chiral stationary phase was applied to the resolution of racemic anilide derivatives of N-acetyl-a-amino acids, 1,1'-bi-2-naphthol and 3,3'-diaryl-1,1'-bi-2-naphthols. The CSP was also applied to the resolution of some chiral drugs including a diuretic, bendroflumethiazide, and non-steroidal anti-inflammatory agents such naproxen and alminoprofen. In every case, the chiral recognition efficiency of the new CSP was quite excellent.
Wang, Wei,Bae, Tae-Sung,Park, Yeon Hyun,Kim, Dong Ho,Lee, Sunghun,Min, Guanghui,Lee, Gun-Hwan,Song, Myungkwan,Yun, Jungheum RSC Pub 2014 Nanoscale Vol.6 No.12
<P>A three-dimensional (3D) transparent conducting electrode, consisting of a quasi-periodic array of discrete indium-tin-oxide (ITO) nanoparticles superimposed on a highly conducting oxide-metal-oxide multilayer using ITO and silver oxide (AgOx) as oxide and metal layers, respectively, is synthesized on a polymer substrate and used as an anode in highly flexible organic solar cells (OSCs). The 3D electrode is fabricated using vacuum sputtering sequences to achieve self-assembly of distinct ITO nanoparticles on a continuous ITO-AgOx-ITO multilayer at room-temperature without applying conventional high-temperature vapour-liquid-solid growth, solution-based nanoparticle coating, or complicated nanopatterning techniques. Since the 3D electrode enhances the hole-extraction rate in OSCs owing to its high surface area and low effective series resistance for hole transport, OSCs based on this 3D electrode exhibit a power conversion efficiency that is 11-22% higher than that achievable in OSCs by means of conventional planar ITO film-type electrodes. A record high efficiency of 6.74% can be achieved in a bendable OSC fabricated on a poly(ethylene terephthalate) substrate.</P>