Decentralized Bezout Identity and a Parametrization of Decentralized Controllers for Singular Systems

1　 IntroductionConsider a singular decentralized control system of the formEx(t) =Ax(t) ∑Ni=1Biui(t)yi =Cix(t) ,i∈ N ={ 1 ,2 ,… ,N}(1 )where x(t)∈ Rn is the state vector,ui(t)∈ Rmi and yi(t)∈ Rpi are respectively the localcontrol input and measure outputvectors of the ith control channel.The matrix E may besingular,i.e.,rank(E) 相似文献   

Investigation on Bending and Creasing of Woven Fabrics under Low Curvature

Under the assumption of semi - circular form for a fabric bend, creasing of fabric strips and compression of fabric loops are analyzed by neglecting the structural complexity of the fabric. The relationship between the creasing force and deformation are deduced using an energy method and solutions are given for a linearly elastic material with constant internal frictional constraint. The agreements between the theoretical predictions and experimental results are very satisfactory.     

Store Environment: Its Importance and Consumers' Expectations on Ca-sual - wear Chain Stores in Honk Kong

This study attempted to examine the importance of storeenvironment in affecting consumers'store choice deci-sion;the relative importance among the three environ-mental factors;and consumers'expectations on store en-vironment for the casual-wear chain stores in HongKong.Julie Baker's Three-category framework onstore environments namely ambient,design and socialfactors was adopted for investigation.The results indi-cated that the store environment was important in affect-ing consumers'selection of store for shopping.It alsorevealed that social factor was perceived relatively im-portant than ambient and design factors.Nine store ex-pectation dimensions were categorised and the resultdemonstrated that most respondents were concerned onthe social aspect in their expectation of having a satisfy-ing store environment.     

Study on Bending of Woven Fabrics Using Linear Viscoelasticity Theory

The bending behavior of woven fabrics under low curva-ture conditions has been analyzed by linear viscoelastictheory.The fabric is assumed to behave viscoelasticallyand to be subjected to frictional restraints in bending de-formation.The frictional restraint is considered to beproportional to the curvature and can be described by africtional moment.A model has been constructed by astandard three-element solid model and a paralleledfrictional sliding element.The equations of the model fora cyclic curvature variation are derived.A set of param-eters of the equations for each fabric has been obtainedexperimentally.Predictions of the bending rigidity andhysteresis for wool,cashmere,wool/polyester blended,polyester and cotton fabrics are made,displaying verygood agreement with the experimental observations.     

Clothing Consumption in Urban China

Based on data gathered through a questionnaire survey with 3,544 respondents in six largest cities in China, the clothing expenditures of Chinese consumers and influential factors are investigated hi this paper. It was found that regional differences exist significantly among the cities, possibly due to differences in economy, customs, culture and other factors. It was also found that the demographic and socioeconomic factors including age, gender, marital status, education level, occupation, and household income have a significant influence on clothing expenditures. Further, the interactive influences of geographic variable with demographic and socioeconomic variables on the clothing expenditures were examined. The findings should have useful implications for segmenting Chinese consumers and developing marketing strategies in China.     

Pilling Segmentation for Objective Pilling Evaluation

IntroductionPillingonfabricsisaquiteunpleasantfeaturewhichaffectsthevisualquality.Pillingisgenerallyformedinfourstages:fuzz,entanglement,growthandwearoff[1].Dailywashingandwearingarethecommonsourcefortheformation.Thedurabilityofagarmentisthereforedeterminedbythetimeusedtoformsuchsmallfuzzballsonsurface.Inthelaboratory,fabricsarecutintosizeandplacedintopillingtesterstosimulatethesituation.ASTMprovidedseveralguidelines[2—5]fortheinspectionwhileAATCCgaveageneraltestingprocedure[6]onpillingre…