본 연구는 발가락 지방 소거 검사 시에 종종 저품질의 영상이 획득되는 경우에 주목하여 다양한 조절인자들을 조절하지 않아도 손쉽게 영상 품질을 향상하는 방법을 고안해보았다. 팬텀과 지원자를 대상으로 발 전용 코일만 사용한 경우와 추가 코일을 결합 사용한 경우의 영상을 획득 후 신호대 잡음비(SNR)를 측정하여 비교하였다. 시상면, 관상면, 축상면 모두 T2 Dixon을 시행하였고, 시상면의 경우 T2 지방 소거(FS)와 T1 지방 소거를 추가 시행하였다. 팬텀 검사에서 추가 코일을 결합 사용 시 SNR은 시상면의 경우 T2 Dixon water는 1.21배, T2 FS은 1.22배, T1 FS은 1.17배 향상되었다. 관상면 T2 Dixon water는 1.15배, 축상면 T2 Dixon water는 1.47배 향상되었다. 지원자 검사에서 추가 코일을 결합 사용 시 SNR은 시상면의 경우 T2 Dixon water는 2.07배, T2 FS은 5.17배, T1 FS은 3.20배 향상되었다. 관상면 T2 Dixon water는 1.20배, 축상면 T2 Dixon water는 1.37배 향상되었다. 추가 코일을 결합 사용하였을 때 모든 지방 소거 검사 및 모든 방향에서 SNR 향상의 결과를 얻을 수 있었다. 결론적으로 사용자의 고도 기술 및 추가 검사 시간이 필요하지 않고도 SNR을 향상할 수 있음을 의미한다.

Mesoporous carbon nanofibers as electrode material for electrical double-layer capacitors(EDLCs) are fabricated using the electrospinning method and carbonization. Their morphologies, structures, chemical bonding states, porous structure, and electrochemical performance are investigated. The optimized mesoporous carbon nanofiber has a high sepecific surface area of 667 m2 g−1, high average pore size of 6.3 nm, and high mesopore volume fraction of 80 %, as well as a unifom network structure consiting of a 1-D nanofiber stucture. The optimized mesoporous carbon nanofiber shows outstanding electrochemical performance with high specific capacitance of 87 F g−1 at a current density of 0.1 A g−1, high-rate performance (72 F g−1 at a current density of 20.0 A g−1), and good cycling stability (92 F g−1 after 100 cycles). The improvement of the electrochemical performance via the combined effects of high specific surface area are due to the high mesopore volume fraction of the carbon nanofibers.

Fluorine-doped tin oxide (FTO) nanoparticles have been successfully synthesized using ultrasonic spray pyrolysis. The morphologies, crystal structures, chemical bonding states, and electrochemical properties of the nanoparticles are investigated. The FTO nanoparticles show uniform morphology and size distribution in the range of 6-10 nm. The FTO nanoparticles exhibit excellent electrochemical performance with high discharge specific capacity and good cycling stability (620mA h g−1 capacity retention up to 50 cycles), as well as excellent high-rate performance (250 mA h g−1 at 700mAg−1) compared to that of commercial SnO2. The improved electrochemical performance can be explained by two main effects. First, the excellent cycling stability with high discharge capacity is attributed to the nano-sized FTO particles, which are related to the increased electrochemical active area between the electrode and electrolyte. Second, the superb high-rate performance and the excellent cycling stability are ascribed to the increased electrical conductivity, which results from the introduction of fluorine doping in SnO2. This noble electrode structure can provide powerful potential anode materials for high-performance lithiumion batteries.

The Magneto-Rheological fluid is the suspended material having the ferromagnetic particles with micrometer size that can change properties by applying magnetic fields. In this paper, the shape design of the T-Flange Magneto-Rheological brake is conducted theoretically. The equations for transmitted torque are derived according to T-Flange configurations of the Magneto-Rheological brake. This feature has more output torque than conventional types. The validity of theoretical results is verified by conducting an analysis of an electromagnet using the finite element method. Then the effectiveness of braking torque is verified to reinforce by comparing the output torque of the conventional Magneto-Rheological brakes.

The filler was one of the structural parts using composite material. The filler manufacturing machine was effectively developed based on the principles of usability by HCI. This machine consisted of an ultrasonic cutter, heater, forming rollers and drawing motor. It applied to separate the disk-shape cutter of ultrasonic cutter in order to remove burning the knife edge of ultrasonic cutter. And the developed machine had the two-stage forming rollers for improved formability which maintained accurately the filler shape.

We prepared polycarbonate (PC)/poly(methyl methacrylate) (PMMA)/multiwall carbon nanotube (MWCNT) nanocomposites by co-rotating twin screw extruder at 533 K. Thermal analysis results indicate that the miscibility of PC and PMMA is enhanced by MWCNTs. Bead necklace-like morphology of PMMA-rich phase is observed in PC/PMMA/MWCNT nanocomposites with increasing PMMA weight fraction due to the bead necklace-like morphology. The tensile strength of PC/PMMA (75/25)/MWCNT (1 wt.%) nanocomposite is 3% higher than those of PC/PMMA (75/25) alloy. Suppression of die swell by MWCNT filler is observed in the melt flow of PC/PMMA/MWCNT nanocomposites during extrusion.