• Journal of the Korean Society for Precision Engineering
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• v.28 no.6
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• pp.716-723
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• 2011

The battery capacity of electric/hybrid vehicle is much larger than present automobile. For that reason, the connector of Green Car should be designed to transmit the high-electric voltage. In addition, the electromagnetic wave should be shielded to protect communication and signal circuits. In this study, shielding performance of the connector was analyzed through electromagnetic shield analysis, and a connector of Green Car was designed using thermoelectrical analysis, which is capable of transmitting the high-electric power. In the design of connector structure, the improved stability and workability was considered.

• Journal of the Semiconductor & Display Technology
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• v.8 no.4
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• pp.53-58
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• 2009

A SMT mounter is a kind of equipment that mounts SMD parts quickly on the printed circuit board. By using linear motors, it is controlled with high speed and precision, which is similar to semi-conductor and display process equipment. It is necessarily used in an assembly process of an electronic device. Mobile devices such as a mobile phone and PDA are required to reduce mount areas due to the demands for high performance and small size. Hence, super small sized and complex mobile devices have been developed. To improve the productivity of the corresponding equipment, designs with large sized, high speed, and multidisciplinary functions have been consistently performed. Meanwhile, a design trend of large size and light-weight on SMT mounter causes a low natural frequency of systems and vibration problems at the high speed operation. In this paper, the dynamic characteristics of the SMD mounter system were investigated through a modal test and transmissibility test, and verified by finite element method. Also, various design improvement was performed to avoid the resonance phenomena.

• Archives of Pharmacal Research
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• v.15 no.1
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• pp.48-51
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• 1992

Achromobacter xylosoxidans KF701 and Pseudomonas putida (NAH7) were significantly different in degradative capability of aromatic compounds including benzoates, biphenyls, and naphthalene. However, both of the bacterial strains can grown on catechol as the sole carbon and energy source. Catechol 2, 3-dioxygenase gene for naphthalene oxidation or biphenyl oxidation was cloned into Escherichia coli HB 701. A E. coli HB 101 clone containing catechol 2, 3-dioxygenase gene from P. putida (NAH7) contains a recombinant plasmid with 3.60kb pBR322 and 6-kb insert DNA. Another E. coli HB101 clone containing catechol 2, 3-dioxygenase gene from A. xylosoxidans KF 701 has a recombinant plasmid with 4.4kb pBR322 and 10-kb insert DNA. Physical maps of the recombinant plasmids were constructed, and catechol 2, 3-dioxygenase gene in the recombinant plasmide was further localized and subcloned int M13. The cloned-catechol 2, 3-dioxygenase game products were identified as yellow bands on nondenaturaing polyacrylamide gel after electrophoresis followed by activity staining with catechol solution.

• Natural Product Sciences
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• v.3 no.1
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• pp.59-70
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• 1997

A rat chemokine, cytokine-induced neutrophil chemoattractant-1 (CINC-1) has chemotactic and activating properties to neutrophils. Rat kidney epithelioid NRK-52E cells contained 4 ng/ml of ClNC-1 as a basal level and their CINC-1 production was significantly increased by stimulation with lipopolysaccharide (LPS) of E. coli. Maximal induction of ClNC-1 was 58 ng/ml when 3 ${\mu}g/ml$ of LPS was treated to the NRK-52E cells. Inhibitory effects on CINC-1 induction in LPS-stimulated NRK-52E cells by extracts prepared from herbal medicines and wild plants in Korea were analyzed. At the final concentration of 100 ${\mu}g/ml$ , 9 species out of 304 species of herbal extracts exhibited more than 50% of inhibition on the CINC-1 induction. The active extracts prepared from Artemisia argyi, Lythrum salicaria, Machilus thunbergii, Magnolia sieboldii, Nelumbo nucifera, Prunus persica, Rubus coreanus, Sanguisorba officinalis, and Tripterygium regelii have been sequentially fractionated to obtain methylene chloride, ethyl acetate, butanol, and aqueous layers. Among solvent fractions of the active herbal extracts, methylene chloride fractions of Artemisia argyi and Magnolia sieboldii exhibited the highest inhibitory effects on CINC-1 induction in LPS-stimulated NRK-52E cells.

• The Journal of the Institute of Internet, Broadcasting and Communication
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• v.17 no.5
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• pp.79-84
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• 2017

This paper is a multi-input multi-path (Multiple-input multiple-output: MIMO) using a space-alternating generalized expectation maximization(SAGE) algorithm in the parameter channel and determine the channel estimation performance. Estimated by the algorithm, SAGE time-varying channel environment, the channel parameters estimated from the parameters of the channel measured in the island region 781 of the band in order to compare the performance and compares the original data. This allows you to check the performance of the algorithm SAGE and is highly stable to delay spread (Delay Spread), the diffusion angle of arrival (Arrive of Angular Spread) performance in terms of accuracy down through the SAGE algorithm for estimating a more general calculation parameters.

• Journal of Advanced Marine Engineering and Technology
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• v.34 no.6
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• pp.852-857
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• 2010

In this paper, we proposed and demonstrated an indoor visible-light communication system using an array of light-emitting diodes (LEDs). The main idea is based on that the LEDs can be used not only for lighting but also for free-space optical communications. Because LEDs offer advantageous properties such as high brightness, reliability, lower power consumption and long lifetime, the indoor visible-light communication systems are going to provide high quality of service by the high radiation power of the LED lighting. Prototype of simplex channel for audio and the full-duplex channel for text message were developed. Results indicates the viability of creating inexpensive free-space optical communication transceivers that might be embedded in commercial light products to supports indoor wireless networking.

• Journal of Korea Multimedia Society
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• v.9 no.1
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• pp.51-58
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• 2006

In this paper, we evaluated Ultra Wideband MC-CDMA system which is the combination of DS-CDMA and OFDM systems, which have been drafting in current standardization for IEEE802.15.3a. Too many Rake Fingers are demanded in the DS-CDMA system to detect multi-path signals, which results in high system complexity. OFDM system fails to qualify for FCC certification unless frequency hopping is off. MC-CDMA has lower complexity compared to DS-CDMA and shows good performance against frequency selective fading. In addition, for a wide-band communication, less radio power per spectrum is allowed in the MC-CDMA system than in an OFDM system. The MC-CDMA system is analyzed by a numerical formula and compared with DS-CDMA and OFDM by a computer simulation.

• Korean Business Review
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• v.3
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• pp.183-210
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• 1990

In this study traditional depreciation method has been analysed carefully and then compared with the depreciation on current cost basis for the purpose of reviewing the basic theory underlying depreciation on current cost basis in view of the current situation demanding new method of depreciation. In this treatise the inevitability of rejecting the basic theory of depreciation and traditional depreciation method has been treated. Furthermore the probable consequence when such refutation of traditional depreciation occurs is studied. How to resolve such problems and what is the basis for claiming for depreciation on current cost basis have been also analysed. Through this analysis and research the following conclusions have been drawn: 1. For the purpose of complete recovery of invested capital depreciation on current cost basis is demanded. 2. For the purpose of undertaking realistic profit computation and accounting to apply to comparison and analysis of business operation depreciation on current cost basis is required. 3. When the feasibility of depreciation on current cost basis is guaranteed' then depreciation on current cost basis can be promoted. 4. Depreciation on current cost basis should be studied from the standpoint of evaluation position.

• KSBB Journal
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• v.31 no.2
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• pp.100-104
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• 2016

Dolsan leaf mustard has various biological functions, including those in the immune system and cancer prevention. It contains high amounts of nutritional and medicinal compounds, which are important for maintaining optimum health. The objective of this study was to determine the total phenolics contents and antioxidant activity in Dolsan leaf mustard pickle (DLMP) during storage. DLMP methanol extracts had the highest total polyphenol and flavonoid contents of $35.56{\pm}0.01GAEmg/g$ and $4.54{\pm}0.03QEmg/g$, respectively. The DPPH and ABTS radical scavenging activities in the DLMP methanol extracts showed the highest activities of 79.4 and 85.36%, respectively. The ferric reducing antioxidant power (FRAP) assay showed 2.24-3.82 mM $FeSO_4$ eq. (p<0.05) in DLMP extracts. Overall, storage at day 14 showed the highest antioxidant activity.

• Natural Product Sciences
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• v.12 no.2
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• pp.113-117
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• 2006

Quercitrin gallate was previously isolated from Persicaria lapathifolia (Polygonaceae) as an inhibitor of superoxide production. In the present study, quercitrin gallate was found to inhibit interleukin (IL)-6 production in lipopolysaccharide (LPS)-stimulated macrophages RAW 264.7 with an $IC_{50}$ value of $63\;{\mu}M$. Furthermore, quercitrin gallate attenuated LPS-induced synthesis of IL-6 transcript but also inhibited LPS-induced IL-6 promoter activity, indicating that the compound could down-regulate IL-6 expression at the transcription level. Since nuclear factor (NF)-kB has been shown to play a key role in LPS-inducible IL-6 expression, an effect of quercitrin gallate on LPS-induced NF-kB activation was further analyzed. Quercitrin gallate exhibited a dosedependent inhibitory effect on LPS-induced nuclear translocation of NF-kB without affecting inhibitory kB (IkB) degradation, and subsequently inhibited LPS-induced NF-kB transcriptional activity in macrophages RAW 264.7. Taken together, quercitrin gallate down-regulated LPS-induced IL-6 expression by inhibiting NF-kB activation, which could provide a pharmacological potential of the compound in IL-6-related immune and inflammatory diseases.