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排序方式: 共有137条查询结果,搜索用时 15 毫秒
1.
Jin-Woo Park Jae Yeong Park Yeun-Ho Joung Allen M.G. 《Components and Packaging Technologies, IEEE Transactions on》2002,25(1):106-111
A new process for the fabrication of high current and very low profile micromachined inductors has been developed. This process involves the combination of mechanical lamination and electrodeposition of copper windings by means of LIGA-like lithography through thick epoxy photoresists. The dimension of the fabricated inductor is 16 mm×19 mm×1 mm. The fabricated inductor has an inductance value of 1.2 μH with DC saturation current of 3 A and an electrical resistance of less than 30 mΩ at 10 kHz 相似文献
2.
This paper presents a cooperative decentralized path-planning algorithm for a group of autonomous agents that provides guaranteed collision-free trajectories in real-time. The algorithm is robust with respect to arbitrary delays in the wireless traffic, possible sources being transmission time and error correction. Agents move on reserved areas which are guaranteed not to intersect, therefore ensuring safety. A handshaking procedure guarantees recent information states for the agents. Conflicts between agents are resolved by a cost-based negotiation process. The basic algorithm is augmented by the introduction of waypoints, which increase performance at the cost of additional wireless traffic. An implementation of the algorithm is tested in simulation and successfully applied to a real system of autonomous robots. The results are presented and discussed. 相似文献
3.
Hye-Jin Kim You-Jung Lee Wa Gao Chung-Han Chung Jin-Woo Lee 《Korean Journal of Chemical Engineering》2012,29(3):384-391
The concentration of four mineral salts in the medium for the production of carboxymethylcellulase (CMCase) by Psychrobacter aquimaris LBH-10 were optimized using orthogonal array method (OAM) and response surface method (RSM) and their results from two statistical
methods were compared. The analysis of variance (ANOVA) of data from central composite design (CCD) based on OAM indicated
that potassium phosphate gave the highest percentage participation for cell growth as well as production of CMCase. However,
their relative participations of four salts for cell growth were different from those for production of CMCase. The ANOVA
of results from RSM indicated that highly significant factors (“probe>F” less than 0.0001) for cell growth were K2HPO4 and (NH4)2SO4, whereas those for production of CMCase were K2HPO4, NaCl, and MgSO4·7H2O. The optimal concentration of K2HPO4, NaCl, MgSO4·7H2O, and (NH4)2SO4 for cell growth extracted by Design Expert Software based on RSM were 7.10, 0.84, 0.24, and 0.33 g/L, respectively, whereas
those for production of CMCase were 3.00, 0.52, 0.34, and 0.45 g/L. The optimal concentrations of salts for cell growth and
production of CMCase using RSM basically coincided with those using OAM as well as those from ‘one-factor-at-a-time’ method.
The production of CMCase by P. aquimaris LBH-10 with optimized concentrations of salts was 273.0 U/mL, which was enhanced by 1.27 times higher than the previous report. 相似文献
4.
So Young Kim Cheol Park Min Yeong Kim Seon Yeong Ji Hyun Hwangbo Hyesook Lee Su Hyun Hong Min Ho Han Jin-Woo Jeong Gi-Young Kim Chang-Gue Son JaeHun Cheong Yung Hyun Choi 《International journal of molecular sciences》2021,22(9)
Coptidis Rhizoma is the dried rhizome from the Coptis chinensis Franch. that has been shown to have a number of beneficial pharmacological properties including antioxidant, anti-inflammatory, and anti-cancer effects. However, the anti-cancer effects of Coptidis Rhizoma on hepatocellular carcinoma (HCC) remain unclear. In this study, we investigated the anti-cancer properties of Coptidis Rhizoma ethanol extract (CR) in HCC Hep3B cells and in a xenograft mouse model. Our results showed that the CR significantly inhibited cell growth and induced apoptosis in Hep3B cells through increased expression of Bcl-2 associated x-protein (Bax) and cleavage of poly-ADP ribose polymerase (PARP), reduced expression of Bcl-2, and activated caspases. CR also increased the generation of intracellular reactive oxygen species (ROS), which caused a loss of mitochondrial membrane potential (MMP, ΔΨm) and activation of the mitochondria-mediated intrinsic apoptosis pathway. Moreover, N-acetylcysteine (NAC), a ROS inhibitor, markedly blocked the effects of CR on apoptotic pathways. CR also induced the expression of light chain 3 (LC3)-I/II, a key autophagy regulator, whereas CR-mediated autophagy was significantly suppressed by NAC. In addition, pre-treatment with NAC perfectly attenuated the inhibition of cell invasion and migration of CR-stimulated Hep3B cells. Furthermore, oral administration of CR suppressed Hep3B tumor growth in xenograft mice without toxicity, alterations to body weight, or changes in hematological and biochemical profiles. Taken together, our findings suggest that CR has anti-tumor effects that result from ROS generation, and may be a potential pharmacological intervention for HCC. 相似文献
5.
Gaze estimation is one of the most promising technologies for supporting indoor monitoring and interaction systems. However, previous gaze estimation techniques generally work only in a controlled laboratory environment because they require a number of high-resolution eye images. This makes them unsuitable for welfare and healthcare facilities with the following challenging characteristics: 1) users’ continuous movements, 2) various lighting conditions, and 3) a limited amount of available data. To address these issues, we introduce a multi-view multi-modal head-gaze estimation system that translates the user’s head orientation into the gaze direction. The proposed system captures the user using multiple cameras with depth and infrared modalities to train more robust gaze estimators under the aforementioned conditions. To this end, we implemented a deep learning pipeline that can handle different types and combinations of data. The proposed system was evaluated using the data collected from 10 volunteer participants to analyze how the use of single/multiple cameras and modalities affect the performance of head-gaze estimators. Through various experiments, we found that 1) an infrared-modality provides more useful features than a depth-modality, 2) multi-view multi-modal approaches provide better accuracy than single-view single-modal approaches, and 3) the proposed estimators achieve a high inference efficiency that can be used in real-time applications. 相似文献
6.
Reliability of polyoxide grown by electron cyclotron resonance (ECR) N2O-plasma on heavily phosphorus-doped polysilicon has been investigated for the interpoly dielectrics (IPDs) of nonvolatile
memories (NVMs). ECR N2O-plasma polyoxide grown on polysilicon with phosphorus of 1 × 1021 cm−3 exhibits a significantly high breakdown field of 10 MV/cm and low electron trapping rate of 0.5 V, which are regardless of
phosphorus concentration. The improvements are attributed to the smooth polyoxide/polysilicon interface, low phosphorus concentration,
and nitrogen-rich layer with strong silicon-nitrogen bonds at the polyoxide/polysilicon interface. 相似文献
7.
A Distributed Medium Access Control (D-MAC) protocol based on UWB for high-rate Wireless Personal Area Networks is specified by the WiMedia Alliance. D-MAC protocol is suitable for ubiquitous connection in home networks, military/medical applications due to its inexpensive cost, low power consumption, high data rate, and distributed approach. In contrast to IEEE 802.15.3, D-MAC makes all devices have the same functionality. And its networks are self-organized and provide devices with functions such as access to the medium, channel allocation to devices, data transmission, quality of service and synchronization in a distributed manner. D-MAC fundamentally removes the problems of the centralized MAC approach revealed at IEEE 802.15.3 MAC by adopting a distributed architecture. However, the current D-MAC can’t prevent QoS degradations, occurred by mobile nodes with low data rate due to bad channel status, which cause critical problems in QoS provisioning to isochronous streams and mobile applications. Therefore, we propose a distributed cooperative MAC protocol for multi-hop WiMedia networks using virtual MIMO links. Based on instantaneous Channel State Information among WiMedia devices, our proposed protocol can intelligently select the transmission path with higher data rate to provide advanced QoS with minimum delay for real-time multimedia streaming services. 相似文献
8.
Wa Gao Chung-Han Chung Jianhong Li Jin-Woo Lee 《Korean Journal of Chemical Engineering》2011,28(11):2184-2189
Physiological factors for the production of pullulan by A. pullulans HP-2001 were optimized using orthogonal array method and their influences were compared using Qualitek-4 software. The analysis
of variance (ANOVA) indicated that the most important factor for cell growth was yeast extract, whereas that for production
of pullulan was glucose. The optimal conditions for cell growth were found to be 100.0 g/L glucose, 10.0 g/L yeast extract,
and initial pH of 6.0, whereas those for the production of pullulan were 100.0 g/L glucose, 2.5 g/L yeast extract, and initial
pH of 5.5. Among four mineral salts in the medium, potassium phosphate (K2HPO4) was found to be the most important factor for cell growth as well as production of pullulan. Next important salt for cell
growth was (NH4)2SO4, whereas that for production of pullulan was NaCl. The optimal concentrations of K2HPO4, NaCl, MgSO4·7H2O, and (NH4)2SO4 for cell growth were 7.5, 1.00, 0.1, and 1.20 g/L, respectively, whereas those for production of pullulan were 2.5, 0.25,
0.8, and 0.30 g/L. The expected cell growth and the production of pullulan by A. pullulans HP-2001 under these optimized conditions were 12.61 and 11.49 g/L, respectively. 相似文献
9.
Yi-Joon Kim Sang-Un Lee Wa Gao Chung-Han Chung Chang-Woo Son Jin-Woo Lee 《Korean Journal of Chemical Engineering》2011,28(7):1580-1586
The optimal conditions of the downstream process for recovery of pullulan produced by Aureobasidium pullulans HP-2001 were examined using response surface method (RSM). The optimal amount of diatomite in filter press and the optimal
flow rate in a continuous flow centrifuge for removal of cells from the culture broth of A. pullulans HP-2001 were found to be 5.0% (v/v) and 2.0 L/min. Based on central composite design (CCD) experiments and analysis of variance
(ANOVA) indicated that the optimal conditions for recovery of pullulan from the supernatant by precipitation were the volume
ratio of ethanol (or isopropanol) to supernatant of 3.0: 1.0, the reaction time of 29.5 h, and the reaction temperature of
20.2 °C. The expected maximal recovery yields of pullulan using ethanol and isopropanol under optimized conditions were 79.2
and 85.5%, respectively. 相似文献
10.
GMT-sheet is used in automobile bumper with high rigidity and strength, and its joining strength is influenced by lap length, one of the joined molding conditions. Fracture strength was calculated by dividing fracture load with cross-sectional area. Total five repeated measurements were made to obtain the average value. Tensile test was conducted at room temperature for 10 specimens. In addition, the effect of compression ratio on creep and tensile performance during lap joined molding was discussed. With increasing lap length, the lap joining efficiency of GMT-sheet was increased. However, higher compression ratio reduced the joining efficiency. Creep test on GMT-sheet showed abrupt fracture without tertiary creep. This can be explained by the weak thermal resistance of the resin. If GMT-sheet was exposed to high temperature for a long time, it was easily failed by external force. 相似文献