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射频消融治疗局部复发性甲状腺小肿瘤(<2mm)的有效性和安全性

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国际医学放射学杂志 2015年第6期 583-583页

作者： J.H.Kim w.s.yoo Y.J.Park D.J.Park T.J.Yun s.H.Choi 龙淼淼 Departments of Radiology Seoul National University HospitalSeoul National University College of Medicine

摘要目的评价与再次手术相比,局限性复发性甲状腺小肿瘤(<2 cm)射频消融的有效性和安全性。材料与方法本回顾性研究经机构伦理委员会批准,无需病人知情同意。

关键词：甲状腺粒子肉内分泌腺复发性射频消融有效性

High Temperature Mechanical Properties of Ni-Al-Cr Based Alloys for Advanced Die-Materials Applications

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Journal of Materials science & Technology 2008年第3期24卷 305-308页

作者： w.Y.Kim H.s.Kim Y.G.yoo I.D.Yeo Advanced Materials R&D Division Korea Institute of Industrial Technology7-47Songdo-dongYeonsu-gu

In this study, we report on advanced Ni3Al based high temperature structural alloys with Zr and B addition in order to apply in the fields of die-casting and high temperature press forming as die materials. Microstructures and mechanical properties of Ni3Al based intermetallic alloys produced by vacuum arc melting were investigated in terms of phase analysis by using a scanning electron microscope （sEM） equipped with an X-ray energy dispersive spectrometer （EDs）, an X-ray diffractometer （XRD） and tensile test. The duplex microstructural feature consisting of γ＇ matrix phase and small intermetallic dispersoids was observed to be distributed over the whole microstructure. The ultimate tensile strength of the present alloy was superior to commercial iron-based and Ni-based die-materials especially in the high temperature region.

关键词： Intermetallic Die material Alloying effect Mechanical property

Effects of Mo and Zr on Microstructure,Mechanical Properties and wear Resistance of Fe-Al Based Alloys

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Journal of Materials science & Technology 2008年第3期24卷 309-312页

作者： I.D.Yeo H.s.Kim Y.G.yoo w.Y.Kim Advanced Materials R&D Division Korea Institute of Industrial Technology7-47Songdo-dongYeonsu-gu

In this work the microstructure, mechanical properties and wear resistance of Fe-Al based alloys with various alloying elements were studied. The microstructures were examined by optical and scanning electron microscopy （sEM） equipped with an energy dispersive X-ray spectroscope （EDs）. Two types of alloys were prepared by vacuum arc melting. One is Fe-28Al based alloys （D03 structured） with and without alloying elements such as Mo and Zr. The other one is Fe-35Al based alloys （B2 structured） produced with the same manner. For both types of alloys, Mo addition had found to exhibit an equiaxed microstructure, while dendritic structure was observed to show the effect of Zr addition. These microstructural features were more evinced with increasing content of alloying element. Concerning the mechanical properties and wear resistance, Fe-35Al based alloys were superior to Fe-28Al based alloys over the whole temperature range investigated.

关键词： Fe-Al alloy Intermetallic Mechanical properties wear resistance

Error resilient concurrent video streaming over wireless mesh networks

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Journal of Zhejiang University-science A(Applied Physics & Engineering) 2006年第5期7卷 684-695页

作者： CHUAH Chen-nee yoo Ben s.J. Electrical and Computer Engineering Department University of California Davis 95616 USA Electrical and Computer Engineering Department

In this paper, we propose a multi-source multi-path video streaming system for supporting high quality concurrent video-on-demand (VoD) services over wireless mesh networks (wMNs), and leverage forward error correction to enhance the error resilience of the system. By taking wireless interference into consideration, we present a more realistic networking model to capture the characteristics of wMNs and then design a route selection scheme using a joint rate/interference-distortion optimiza- tion framework to help the system optimally select concurrent streaming paths. we mathematically formulate such a route selec- tion problem, and solve it heuristically using genetic algorithm. simulation results demonstrate the effectiveness of our proposed scheme.

关键词： wireless mesh network, Concurrent video streaming, Interference

Relation between etching profile and voltage-current shape of sintered siC etching by atmospheric pressure plasma

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Plasma science and Technology 2019年第4期21卷 137-144页

作者： D C sEOK s R yoo K I LEE Y s CHOI Y H JUNG Plasma Technology Research Center National Fusion Research InstituteGunsan City 54004Republic of Korea

sintered silicon carbide(siC)was etched by a dielectric barrier discharge source.A high voltage bipolar pulse was used with helium gas for the plasma *** stable filament plasma was generated and could be used for siC *** the processing gas(NF3)mixing rate increased,the width and depth of the etching profile became narrower and *** differentiated V-Q Lissajous method was used for measuring the capacitances(Ceq)of the electrode after the plasma turned *** width of the etching profile was proportional to *** the current peak value/smx of the substrate current in creased,the volume removal rate of siC *** etch depth was proportional to the ratio of/smx to ***,because of the different characteristics of the plasma disks on siC substrate by the voltage polarity,the etching profile was ***,in high NF3 mixing process,the etching profile became stable and deeper.

关键词： dielectric barrier discharge silicon carbide plasma etching、filament discharge,surface charge

Polaron Effect of a Two Electron Parabolic Quantum Dot

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Communications in Theoretical Physics 2013年第6期59卷 763-768页

作者： s.saravana Kumar A.John Peter Chang Kyoo yoo Department of Physics Nadar Saraswathi College of Engineering and Tecchnology Vadapudupatti Department of Physics Government Arts College Center for Environmental studies/Green Energy Center Department of Environmental Science and Engineering Collegeof Engineering Kyung Hee University

Polaron induced double electron in a quantum dot is investigated using the exact diagonalization techniques and the compact density-matrix approach. The dependence of nonlinear optical processes on the incident photon energies and the polaronic effect are brought out. The linear, third order non-linear optical absorption coefficients and the refractive index changes of singlet and triplet states as a function of photon energy are obtained with and without the inclusion of polaronic effect. It is found that the geometrical confinement and the effect of polaron have great influence on the optical properties of dots.

关键词： parabolic quantum dot correlation energy semiconductor

Development of Co-sintering Process for Effective Fabrication of Direct-write Planer waveguide

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光学学报 2003年第S1期23卷 279-280页

作者： w.Jung s. yoo s. Boo U.-C. Paek w.-T. Han Department of Information and Communications Kwangju Institute of Science and Technology I Oryong-dong Buk-gu Gwangju 500-712 South Korea

we propose a co-sintering process for effective fabrication of three-layered structure for direct-write planar waveguide. Processing parameters and optical properties of the waveguide was investigated.

关键词： optical properties of planar waveguide

Representation of Urban Buildings Using Modified Relief Mapping

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Journal of Computer science & Technology 2006年第2期21卷 204-208页

作者： Byounghynn yoo soonhung Han Department of Mechanical Enginccring Koren Aduanced Institute of Science and TechnologyDeajeon305-701Korea

This paper describes the real-time mapping displacement of buildings onto the polygon model of base terrain of geo-spatial information,The buildings are represented as height maps,lcading to low memory requirements and not involving changes of the original geometry（*** vertices are created or displaced）.The displacement of buildings is mapped toward the protruding direction,The base of textrue which represents the ground in topography is correctly mapped onto base polygon without any *** approach can exhibit the correct,occlusions between buildings and ground due to parallax and correct self-occlusion.

关键词： acrial photograph digital map displacement mapping gco-visualization image-based rendering

Microstructure,Elastic Modulus and Tensile Properties of Ti-Nb-O Alloy system

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Journal of Materials science & Technology 2008年第1期24卷 33-36页

作者： H.s.Kim T.Y.Ra I.D.Yeo H.J.Bang Y.G.yoo w.Y.Kim Advanced Materials R＆D Division Korea Institute of Industrial Technology Incheon 406-800 Korea

In the present study Ti-Nb binary alloy system was chosen because it has excellent biocompatibility as well as reasonable mechanical properties,aiming at understanding oxygen content on microstructural formation, elastic modulus and tensile properties in Ti-Nb alloy *** alloy buttons of 50 mm in diameter were prepared by arc melting on a water-cooled copper hearth under an argon gas atmosphere with a non-consumable tungsten *** button ingots were then heat treated in a vacuum atmosphere at 1273 K for 0.5 h followed by water quenching in a specially designed heat treatment ***,elastic modulus and tensile properties were investigated in order to understand the effect of oxygen content in quenched Ti- Nb alloy *** orthorhombic structuredα″martensite was changed to bcc structuredβ-phase with increasing Nb ***,it was found that oxygen makesβ-phase stable in quenched Ti-Nb alloy *** modulus values were sensitive to phase stability of constituent *** strength increased with increasing oxygen *** will be explained by phase formation and stability behavior.

关键词： Ti-Nb-O alloy Phase stability Elastic modulus Mechanical properties