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연약지반 성토시 사면의 안정에 미치는 Geotextile의 효과
김수일,조삼덕,우제윤 연세대학교 산업기술연구소 1982 논문집 Vol.14 No.2
Geotextiles have been extensively used in road constructions as effective and economical materials performing several functions such as separation, filtration, drainage, protection against frost break, and as reinforcement to improve the load bearing capacity and stability of road. In this study, a method for the analysis of embankment reinforced with geotextile is studied. Computer program based on the simplified Bishop method is modified in order to investigate quantitively the effect of gotextile on the slope stability of embankment on weak soils. Evaluation of the tensile strength required for the design safety factor is also possible utilizing the computer program in this study.
김광호,김제덕 청주대학교 산업과학연구소 1995 産業科學硏究 Vol.13 No.-
Use of a rapid thermal annealing(RTA) technique is shown to improve the properties of metal-ferroelectric BaMgF_(4)-silicon structures The fluoride film was deposited in an ultra-high vacuum system at a substrate temperature of 300℃. A post-deposition annealing was conducted for 10 seconds at 600℃ in a vacuum of 0.1 Torr, using a home-made RTA apparatus. The results were found out to increase the resistivity of the ferroelectric BaMgF_(4) film from a typical value of 1-2×10^(11) Ω · cm before the annealing to about 5×10^(13) Ω · cm and reduce the interface state density of the BaMgF_(4)/Si interface to about 8×10^(10) /cm^(2) ·eV. Ferroelectric hysteresis measurements using a Sawyer-Tower circuit yielded remanent polarization and coercive field values of about 0.5 μC/cm^(2) and 80㎸/cm, respectively. The typical remanent polarization of the BaMgF_(4) films on the (100) amd (111) orientated silicon wafers were 0.5-0.6 μC/cm^(2) and that of the films on the (110) wafers was 1.2 μC/cm^(2).
Deok-Je Bang,Seon-Hwan Hwang 전력전자학회 2016 JOURNAL OF POWER ELECTRONICS Vol.16 No.5
This paper proposes a wide air-gap control method for the multi-module permanent magnet linear synchronous motor (MM-PMLSM) based on independent vector control. In particular, the MM-PMLSM consists of symmetrical multi-module and multi-phase structures, which are basically three-phase configurations without a neutral point, unlike conventional three-phase machines. In addition, there are no additional magnetic levitation windings to control the normal force of the air-gap between each stator and mover. Hence, in this paper, a dq-axis current control applying a d-q transformation and an independent vector control are proposed for the air-gap control between the two symmetric stators and mover of the MM-PMLSM. The characteristics and control performance of the MM-PMLSM are analyzed under the concept of vector control. As a result, the proposed method is easily implemented without additional windings to control the air-gap and the mover position. The effectiveness of the proposed independent vector control algorithm is verified through experimental results.
Nafion-Propyl-1,2,3-Triazole Composite Membrane for Fuel Cells
Kim, Je-Deok,Ghil, Lee-Jin,Jun, Mun-Suk,Choi, Jong-Kwon,Chang, Hye-Jung,Kim, Yu-Chan,Rhee, Hee-Woo The Electrochemical Society 2014 Journal of the Electrochemical Society Vol.161 No.6
<P>Propyl-1,2,3-triazole was synthesized within the nanostructure of Nafion giving a Nafion – propyl-1,2,3-triazole composite, which was confirmed by IR and NMR. TEM images of the material revealed that the cluster structure of the composite membrane is smaller than that of Nafion. Analysis of the mechanical properties of the composite membrane showed that propyl-1,2,3-triazole might contribute to improve the strength of the network. A maximum conductivity of 0.07 S/cm and current density of 760 mA/cm<SUP>2</SUP> at 0.6 V were obtained under cell conditions of 70°C, RH = 100%.</P>