• Proceedings of the Korean Vacuum Society Conference
• /
• 2010.08a
• /
• pp.59-59
• /
• 2010

Graphene has attracted much interest because of its fascinating electronic structure with excellent electron mobility. However, there are some difficulties in making graphene of large and uniform area for real applications. One alternative is graphite oxide. Since graphite oxide is water soluble, it can be sprayed or spin-coating onto any substrates for applications such as Transparent Conducting Film (TCF) and Field Effect Transistor (FET). In this talk, chemical and physical properties of graphite oxide will be discussed. In addition, possible applications made of graphite oxide (GO) will be introduced.

• Proceedings of the Materials Research Society of Korea Conference
• /
• 2010.05a
• /
• pp.4.1-4.1
• /
• 2010

In the first part, after discussing works on nacre, a soft-hard composite found in nature, including a simulation on network mimicking nacre [1-4], we talk on a simple model of spider webs, another example of natural soft-hard structure [5]. We demonstrate that the web network is free of stress concentrations because the radial threads are stronger than the spiral threads. In the second part, after reviewing our works on wetting on textured surfaces [6-8], we discuss penetration into textured surface and instability of a liquid film on textured substrates during spin coating [9,10].

• Journal of the Korean Society for Precision Engineering
• /
• v.16 no.8
• /
• pp.88-99
• /
• 1999

In this paper, a disassemblability evaluation has been investigated quantitatively by using an ease-of-disassembly design method. Four categories such as recognizability, approachability, separability, and treatability have been analyzed in details. A simulation software for estimating the ease-of-disassembly design method has been developed and applied to door trim and spin basket respectively as an example.

• Journal of KSNVE
• /
• v.5 no.1
• /
• pp.85-93
• /
• 1995

The vibration of the dehydration process in a washing machine is important problem that affects the performance of products. In this paper, the upper structure of a washing machine is modeled as rigid body suspension system and, by numerical analysis, the amplitude of a spin basket and the transfer moment at a base plate are calculated. To examine the vibrational characteristics according to design variable change, the friction coefficient in anubber, the radius of curvature, the stiffness coefficient, initial length and locations of support springs are considered in the analysis. Experimental results are compared with those of analysis.

• Journal of Magnetics
• /
• v.1 no.1
• /
• pp.1-3
• /
• 1996

The $YBa_2Cu_3O_{7-x}$ structure has been fluorinated by a gas phase exchange technique. The ${^19}F$NMR (nuclear magnetic resonance) spin-lattice relaxation rate (1/T1) measurements on a fluorinated sample gave superconducting energy gap of $2\Delta=4.6kT_c$.

• Proceedings of the Korean Ceranic Society Conference
• /
• 2003.10a
• /
• pp.205.2-205
• /
• 2003

• Journal of Magnetics
• /
• v.15 no.4
• /
• pp.149-154
• /
• 2010

Synthetic antiferromagnets (SAFs) are used as free layer structures for various magnetic devices utilizing spintransfer torque (STT). Therefore, it is important to understand current-induced excitation of SAFs. By means of drift-diffusion and macrospin models, we studied the current-induced excitation of a SAF-free layer structure (NiFe/Ru/NiFe). The simulation results were compared with the previous experimental results [N. Smith et al., Phys. Rev. Lett. 101, 247205 (2008)]. We confirmed that a nonzero STT through the Ru layer is essential for explaining the experimental results.

• Proceedings of the Korean Magnestics Society Conference
• /
• 2002.12a
• /
• pp.17-17
• /
• 2002

The magnetic effects connected to finite-size of the particles become dominant at transition of particles in region several nanometers and less [1]. At reduction of atom numbers in magnetic cluster (tens or hundreds atoms), along the classical features, essential appear the quantum phenomena resulting in spin transformation of magnetic structure, both with reduction of the size and at applying of an external magnetic field. (omitted)

• Proceedings of the Korean Magnestics Society Conference
• /
• 2002.12a
• /
• pp.70-71
• /
• 2002

터널 접합 소자은 절연층을 사이에 둔 두 강자성체로 이루어지는 데 두 강자성체의 서로 다른 보자력 차이로 인가해주는 자장의 방향에 기인한 spin들의 평행함과 반평행함에 의해 나타나는 자기 저항 현상을 이용한 것이다. 이 TMR 현상은 비휘발성, 고집적도, 적은 전력손실로 인해 차세대 RAM으로 사용될 것으로 보이는 MRAM 소자로써의 적용을 위해 연구 중에 있다. 그러나 TMR소자 공정중에서 비중이 큰 절연층 형성에서의 여러 요인의 개입으로 인해 고른 절연층 형성이 어려운 실정이다. (중략)

• Proceedings of the Korean Magnestics Society Conference
• /
• 2015.11a
• /
• pp.96-96
• /
• 2015