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排序方式: 共有78条查询结果,搜索用时 9 毫秒
21.
Jin-Young Kim Masayori Miyashita Nozomu Uchida Keizo Uematsu 《Journal of Materials Science》1992,27(24):6609-6614
A novel characterization method was applied to study the morphological changes of large pores in a ceramic green body during the early stage of densification at 1100°C for 1–64 h. Large processing pores were present in the green body. They were preserved after densification up to a relative density of 83.9% with their shape and size unchanged significantly. The pore size distribution determined by mercury porosimetry showed the growth of matrix pores of small size, but failed to show the change of large processing pores with densification. 相似文献
22.
Probabilistic Characteristics of Drought Propagation from Meteorological to Hydrological Drought in South Korea 总被引:4,自引:0,他引:4
Sattar Muhammad Nouman Lee Jin-Young Shin Ji-Yae Kim Tae-Woong 《Water Resources Management》2019,33(7):2439-2452
Water Resources Management - A reliable understanding of propagation from meteorological to hydrological drought is necessary for accurate forecasting of hydrological droughts. Our current... 相似文献
23.
24.
Jin-Young Kim Hoonbae Kim Shang Hyeun Park Taewon Jeong Min Jong Bae Yong Churl Kim Intaek Han Donggeun Jung SeGi Yu 《Organic Electronics》2012,13(12):2959-2966
AC driven inorganic electroluminescence (EL) of the carbon nanotube (CNT)-polymer/phosphor composite was fabricated to investigate the effect of the critical percolation threshold by CNT concentration on EL performance. In order to control the appropriate CNT condition in EL device, CNTs were shortened by cryogenic crushing and purified by thermal treatment. Among various CNT concentrations in the composite film, the critical percolation threshold can be found to be 0.0925 wt.% by fitting conductivity data of the composite film. Near the critical percolation threshold of a CNT concentration, the EL performances of the composite EL were greatly increased compared to the reference EL. The tunneling barrier thickness at the ZnS–CuxS contact could become thin to induce more charge carrier tunneling into ZnS host lattice by the local field enhancement of CNTs, resulting in increased electron–hole recombination to produce more light emission. 相似文献
25.
In this research, to develop proper electroless copper electrolytes for semiconductor interconnects, the concentration and amount of additives are varied. Then, the stability, reactivity, deposition rate, leveling effect, and surface structure are examined. After a virgin makeup solution with suitable deposition characteristics is obtained, an electroless copper coating layer of high uniformity and adhesion strength was achieved using the stabilizer, catalyst, buffer, and pH adjuster as additives and surfactant on Ru diffusion barriers. Through annealing, resistance characteristics could be enhanced. Moreover, by measuring the cyclic voltammetry stripping and mixed potential of the electroless Cu electrolyte, its surface reactivity is electrochemically evaluated, and the result is in agreement with the deposition reaction. When the electrolyte developed in this study is applied on a trench pattern wafer with A/R 3.5 and a line width of 30 nm, it is possible to observe immaculate filling with improved leveling. 相似文献
26.
Ki-Seok Bang Jin-Young Choi Chuck Yoo 《IEEE transactions on pattern analysis and machine intelligence》2001,27(6):573-576
The paper by G.J. Holzmann (see ibid., vol.23, no.5, p.279-95, 1997) describes how to apply SPIN to the verification of a synchronization algorithm (L.M. Ruane, 1990) in process scheduling of an operating system. We report an error in the verification model presented by G.J. Holzmann and present a revised model with verification result. Our result explains the reason why SPIN found the race condition in the synchronization algorithm. We also show that the suggested fix by G.J. Holzmann is incorrect 相似文献
27.
Solvent extraction experiments of Gd with 40% saponified PC88A have been conducted from a chloride solution under different
extraction conditions. The effect of saponification of an acidic extractant on the extraction of Gd was investigated. To analyze
the ionic equilibria of a GdCl3 solution, we estimated the necessary thermodynamic properties from reported values. Moreover, when applying the chemical
model developed in this study, we used experimental data to estimate the equilibrium constant for the extraction of Gd with
partially saponified PC88A. 相似文献
28.
29.
Jin-Young Jeon 《Journal of Mechanical Science and Technology》2009,23(5):1435-1445
Piezoelectric materials can be used for structural damping because of their ability to efficiently transform mechanical energy
to electrical energy and vice versa. The electrical energy may be dissipated through a connected load resistance. In this
paper, a new optimization technique for the optimal piezoelectric shunt damping system is investigated in order to search
for the optimal shunt electrical components of the shunt damping circuit connected to the piezoelectric patch on a vibrating
structure for the structural vibration suppression of several modes. The vibration suppression optimization technique is based
on the idea of using the piezoelectric shunt damping system, the integrated p-version finite element method (p-version FEM),
and the particle swarm optimization algorithm (PSOA). The optimal shunt electrical components for the piezoelectric shunt
damping system are then determined by wholly minimizing the objective function, which is defined as the sum of the average
vibration velocity over a frequency range of interest. Moreover, the optimization technique is performed by also taking into
account the inherent mechanical damping of the controlled structure with the piezoelectric patch. To numerically evaluate
the multiple-mode damping capability by the optimal shunting damper, an integrated p-version FEM for the beam with the shunt
damping system is modeled and developed by MATLAB. Finally, the structural damping performance of the optimal shunt damping
system is demonstrated numerically and experimentally with respect to the beam. The simulated result shows a good agreement
with that of the experimental result.
This paper was recommended for publication in revised form by Associate Editor Eung-Soo Shin
Jin-Young Jeon received his Ph.D. degree in Mechanical and Aerospace Engineering from Tokyo Institute of Technology in 2005. Dr. Jeon is
currently a senior engineer at Digital Printing Division, Digital Media & Communications Business at Samsung Electronics Co.,
Ltd., Korea. His research interests are the areas of structural-acoustic optimization, sound quality, motion quality, and
vibration control. 相似文献
30.
Intermetallic compound formation at the interface between Sn-3.0Ag-0.5Cu (SAC) solders and electroless nickel/electroless
palladium/immersion gold (ENEPIG) surface finish and the mechanical strength of the solder joints were investigated at various
Pd thicknesses (0 μm to 0.5 μm). The solder joints were fabricated on the ENEPIG surface finish with SAC solder via reflow soldering under various conditions.
The (Cu,Ni)6Sn5 phase formed at the SAC/ENEPIG interface after reflow in all samples. When samples were reflowed at 260°C for 5 s, only (Cu,Ni)6Sn5 was observed at the solder interfaces in samples with Pd thicknesses of 0.05 μm or less. However, the (Pd,Ni)Sn4 phase formed on (Cu,Ni)6Sn5 when the Pd thickness increased to 0.1 μm or greater. A thick and continuous (Pd,Ni)Sn4 layer formed over the (Cu,Ni)6Sn5 layer, especially when the Pd thickness was 0.3 μm or greater. High-speed ball shear test results showed that the interfacial strengths of the SAC/ENEPIG solder joints decreased
under high strain rate due to weak interfacial fracture between (Pd,Ni)Sn4 and (Cu,Ni)6Sn5 interfaces when the Pd thickness was greater than 0.3 μm. In the samples reflowed at 260°C for 20 s, only (Cu,Ni)6Sn5 formed at the solder interfaces and the (Pd,Ni)Sn4 phase was not observed in the solder interfaces, regardless of Pd thickness. The shear strength of the SAC/ENIG solder joints
was the lowest of the joints, and the mechanical strength of the SAC/ENEPIG solder joints was enhanced as the Pd thickness
increased to 0.1 μm and maintained a nearly constant value when the Pd thickness was greater than 0.1 μm. No adverse effect on the shear strength values was observed due to the interfacial fracture between (Pd,Ni)Sn4 and (Cu,Ni)6Sn5 since the (Pd,Ni)Sn4 phase was already separated from the (Cu,Ni)6Sn5 interface. These results indicate that the interfacial microstructures and mechanical strength of solder joints strongly
depend on the Pd thickness and reflow conditions. 相似文献