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Yu-Chang Eun Seok-Yong Jin Yun-Pyo Hong Hong-Yeop Song 《IEEE transactions on information theory / Professional Technical Group on Information Theory》2004,50(10):2438-2442
We classify some p/sup k/-ary (p prime, k integer) generalized m-sequences and generalized Gordon-Mills-Welch (GMW) sequences of period p/sup 2k/-1 over a residue class ring R=GF(p)[/spl xi/]/(/spl xi//sup k/) having optimal partial Hamming autocorrelation properties. In frequency hopping (FH) spread-spectrum systems, these sequences are useful for synchronizing process. Suppose, for example, that a transmitting p/sup k/-ary FH patterns of period p/sup 2k/-1 are correlated at a receiver. Usually, the length of a correlation window, denoted by L, is shorter than the pattern's overall period. In that case, the maximum value of the out-of-phase Hamming autocorrelation is lower-bounded by /spl lceil/L/p/sup k/+1/spl rceil/ but the classified sequences achieve this bound with equality for any positive integer L. 相似文献
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Baek Keon-Hee Jeong Nak-Tak Hong Hee-Rok Choi Su-bin Lee Eun-Seong Kim Hyung-Min Kwon Ji-Woon Song Seok-Yong Jang Hong-Seok Lee Ho-Yong Suh Myung-Won 《Journal of Mechanical Science and Technology》2019,33(4):1689-1702
Journal of Mechanical Science and Technology - Threaded fasteners are widely used in mechanical structures primarily owing to their easy disassembly for maintenance and low cost. However, the... 相似文献
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Seok-Yong Oh Dong-Jo Park 《Fuzzy Systems, IEEE Transactions on》1998,6(4):482-491
An adaptive fuzzy logic controller (FLC) is designed for plants with unknown and/or time-varying dead zones. The steady-state control resolutions with perturbing action, which are different from the ones in the transient states, are used to cancel out the unknown and/or time-varying dead-zone effects. Automatically adjusted control resolutions play a key role as a fuzzy dead-zone inverse. The control resolutions of the control input variables are dependent on the scaling gains of the variables. Therefore, we can develop the fuzzy dead-zone inverse by reperturbing and adjusting the scaling gains adequately in the steady-states. The developed fuzzy logic controllers that are applied to the plants with unknown dead zones ensure their effectiveness even though the dead-zone characteristics are time varying 相似文献
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Kanwischer M Kim SY Kim JS Bian S Kwon KA Kim DD 《Drug development and industrial pharmacy》2005,31(1):91-97
Glucosamine sulfate (GS) is known to stop the degenerative process of osteoarthritis. Because most of the GS formulation on the market is in the oral form, an alternative formulation such as a transdermal delivery system (TDS) is necessary in order to increase patient compliance. As the initial step to develop a TDS of GS, the physicochemical stability and permeation study in rat skin were examined. Evaluation of the stability of GS at different pHs showed the compound to be most stable at pH 5.0. The degradation rate constant at 25°C was estimated to be 5.93 ×10- 6 hr- 1 (t90~ 2.03 years) in a pH 5 buffer solution. Due to its hydrophilic characteristic, low skin permeability was expected of GS. However, the skin permeation rate was determined to be 13.27 µg/cm2/hr at 5% concentration. Results of this study suggest the possibility of developing GS into a transdermal delivery system. 相似文献
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