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101.
Young?Tae?Im Seung?Tae?ChoiEmail author Tae?Sang?Park Jae?Hyun?Kim 《Journal of Mechanical Science and Technology》2004,18(1):12-19
Using LSM (laser scanning method), the radius of curvature due to thermal deformation in polyimide film coated on Si substrate
is measured. Since the polyimide film shows viscoelastic behavior, i.e., the modulus and deformation of the film vary with
time and temperature, we estimate the relaxation modulus and the residual stresses of the polyimide film by measuring the
radius of curvature and subsequently by performing viscoelastic analysis. The residual stresses relax by an amount of 10%
at 100°C and 20% at 150°C for two hours. 相似文献
102.
Seok Jin Lim Suk Jae Jeong Kyung Sup Kim Myon Woong Park 《The International Journal of Advanced Manufacturing Technology》2006,28(5-6):618-625
Today’s business environment is experiencing as a period of expansion and the globalization. Therefore, a distribution plan
with low cost and high customer satisfaction in supply chain management (SCM) has been widely investigated. The purpose of
this study is to establish optimal distribution planning in the supply chain. In this paper, a hybrid approach involving a
genetic algorithm (GA) and simulation is presented to solve this problem. The GA is employed in order to quickly generate
feasible distribution sequences. Considering uncertain factors such as queuing, breakdowns and repairing time in the supply
chain, the simulation is used to minimize completion time for the distribution plan. The computational results for an example
of a simple supply chain are given and discussed to validate the proposed approach. We obtained a more realistic distribution
plan with optimal completion time by performing the iterative hybrid GA simulation procedure which reflects the stochastic
nature of supply chains. 相似文献
103.
In this research, a remote control system has been developed and implemented, which combines autonomous obstacle avoidance
in real-time with force-reflective tele-operation. A teleoperated mobile robot is controlled by a local two-degrees-of-freedom
force-reflective joystick that a human operator holds while he is monitoring the screen. In the system, the force-reflective
joystick transforms the relation between a mobile robot and the environment to the operator as a virtual force which is generated
in the form of a new collision vector and reflected to the operator. This reflected force makes the tele-operation of a mobile
robot safe from collision in an uncertain and obstacle-cluttered remote environment. A mobile robot controlled by a local
operator usually takes pictures of remote environments and sends the images back to the operator over the Internet. Because
of limitations of communication bandwidth and the narrow viewangles of the camera, the operator cannot observe shadow regions
and curved spaces frequently. To overcome this problem, a new form of virtual force is generated along the collision vector
according to both distance and approaching velocity between an obstacle and the mobile robot, which is obtained from ultrasonic
sensors. This virtual force is transferred back to the two-degrees-of-freedom master joystick over the Internet to enable
a human operator to feel the geometrical relation between the mobile robot and the obstacle. It is demonstrated by experiments
that this haptic reflection improves the performance of a tele-operated mobile robot significantly. 相似文献
104.
105.
Yang-Hyun Koo Chong-Tak Lee Je-Yong Oh Dong-Seong Sohn M. Baryshnikov A. Chechurov B. Margulis 《Nuclear Engineering and Design》2008,238(7):1592-1600
Reactivity initiated accident (RIA) tests with 4 unirradiated Zr based uranium metal fuel rods were performed to establish a criterion which should be observed under RIA conditions. Of the four tests, fuel failures were observed in the two tests that experienced the maximum energy depositions of 188 and 212 cal/g, respectively. However, the fuel failures were not observed at the place of a maximum energy deposition but at the position where the thermocouples were installed; one failed at the position whose local energy deposition was 150 cal/g, and the other one at the place with energy deposition of 170 cal/g. The fuel failures seem to have occurred because excessive pressure, which was caused by the partial melting of the fuel meat, was applied to the cladding with a reduced thickness. However, other parts of the fuel rods including the place of a maximum energy deposition maintained their integrity and a big change in the temperature and pressure in the internal capsule, which would be an indication of the fragmentation and dispersion of the fuel meat into the internal capsule, was not observed. Visual inspection also showed that, except for the thermocouple positions, there was no trace of clad failure such as the formation of brittle cracks in the cladding or melting of the cladding. Therefore, for the Zr based uranium metal fuel rods, it can be concluded that the threshold energy deposition above which fragmentation and dispersion of fuel meat into the primary coolant system is expected to occur could be higher than 212 cal/g. 相似文献
106.
107.
Haegyeom Kim Dong‐Hwa Seo Jae Chul Kim Shou‐Hang Bo Lei Liu Tan Shi Gerbrand Ceder 《Advanced materials (Deerfield Beach, Fla.)》2017,29(37)
Novel and low‐cost batteries are of considerable interest for application in large‐scale energy storage systems, for which the cost per cycle becomes critical. Here, this study proposes K0.5MnO2 as a potential cathode material for K‐ion batteries as an alternative to Li technology. K0.5MnO2 has a P3‐type layered structure and delivers a reversible specific capacity of ≈100 mAh g?1 with good capacity retention. In situ X‐ray diffraction analysis reveals that the material undergoes a reversible phase transition upon K extraction and insertion. In addition, first‐principles calculations indicate that this phase transition is driven by the relative phase stability of different oxygen stackings with respect to the K content. 相似文献
108.
109.
Baek MJ Park JY Xu W Kattel K Kim HG Lee EJ Patel AK Lee JJ Chang Y Kim TJ Bae JE Chae KS Lee GH 《ACS applied materials & interfaces》2010,2(10):2949-2955
A facile one-pot synthesis of a water-soluble MnO nanocolloid (i.e., D-glucuronic acid-coated MnO nanoparticle) is presented. The MnO nanoparticle in the MnO nanocolloid was coated with a biocompatible and hydrophilic D-glucuronic acid, and its particle diameter was nearly monodisperse and ranged from 2 to 3 nm. The average hydrodynamic diameter of the MnO nanocolloid was estimated to be 5 nm. The MnO nanoparticle was nearly paramagnetic down to T=3 K. The MnO nanocolloid showed a high longitudinal water proton relaxivity of r1=7.02 s(-1) mM(-1) with the r2/r1 ratio of 6.83 due to five unpaired S-state electrons of Mn(II) ion (S=5/2) as well as a high surface to volume ratio of the MnO nanoparticle. High contrast in vivo T1 MR images were obtained for various organs, showing the capability of the MnO nanocolloid as a sensitive T1 MRI contrast agent. The suggested three key-parameters which control the r1 and r2 relaxivities of nanocolloids (i.e., the S value of a metal ion, the spin structure, and the surface to volume ratio of a nanoparticle) successfully accounted for the observed r1 and r2 relaxivities of the MnO nanocolloid. 相似文献
110.
Preparations of PbS-coated titanium dioxide (TiO2) and lead sulfide (PbS) nanoparticles under ultrasonic field at the multibubble sonoluminescence (MBSL) conditions were tested in water solutions. Under the optimal MBSL conditions (20 kHz and 220 W power input), PbS nanoparticles (diameter = 40-50 nm) were prepared by treating lead nitrate and thioacetamide for 20 min in water solutions. The size of PbS nanoparticles was found to be easily increased to about 90 nm in diameter by increasing the reactant concentration twice. A similar sonochemical reaction with TiO2 nanoparticles (about 20-30 nm in diameter) gave rise to PbS-coated TiO2 nanoparticles with a core/shell structure. The PbS thin film coating was quite uniform and the average coating depth of PbS on the TiO2 nanoparticles was about 2-3 nm under the described conditions. It is interesting to note that the coating depth was found to be controlled to 2-10 nm range by increasing the amounts of reactants for Pb and S twice with a sonication time of 30 min. 相似文献