Showing papers by "National Cheng Kung University published in 1985"
TL;DR: In this paper, the minimum diameter, maximum connectivity circulant problem is considered and several results are given for the general case and a simple solution is derived for the connectivity four case.
Abstract: It is well known that maximum connectivity graphs play an important role in the design of reliable networks. The class of symmetric graphs called circulants is known to contain such maximum connectivity graphs. Although not all circulants have this maximum connectivity property, those that do have a great variation in their diameters. Since diameter is a measure of transmission delay, the minimum diameter, maximum connectivity circulant problem is considered here. Several results are given for the general case and a simple solution is derived for the connectivity four case.
116 citations
TL;DR: The concept of coefficient shift matrix is introduced to represent delay variables in block pulse series and the optimal control of a linear delay system with quadratic performance index is studied via block pulse functions.
Abstract: The concept of coefficient shift matrix is introduced to represent delay variables in block pulse series. The optimal control of a linear delay system with quadratic performance index is then studied via block pulse functions, which convert the problems into the minimization of a quadratic form with linear algebraic equation constraints. The solution of the two-point boundary-value problem with both delay and advanced arguments is circumvented. The control variable obtained is piecewise constant.
71 citations
TL;DR: In this article, the authors extended the application of shifted Legendre polynomial expansion to time-varying systems by representing the product of two shifts in a shift Legendre series in a new shift-legendre series.
Abstract: This paper extends the application of shifted Legendre polynomial expansion to time-varying systems. The extension is achieved through representing the product of two shifted Legendre series in a new shifted Legendre series. With this treatment of the product of two time functions, the operational properties of the shifted Legendre polynomials are fully applied to the analysis and optimal control of time-varying linear systems with quadratic performance index.
53 citations
TL;DR: In this paper, the continuous shifted Legendre polynomials are first used to solve the problem of analysis and parameter identification of lime-delay systems using rectangular functions such as Walsh and block-pulse functions.
Abstract: The problems of analysis and parameter identification of lime-delay systems have been recently studied using rectangular functions such as Walsh and block-pulse functions. In this paper, the continuous shifted Legendre polynomials are first used to solve the above-mentioned problems. The approach followed is that of converting the delay-differential equation to an algebraic form through using the operational matrices of integration and delay. The key point is the derivation of a delay operational matrix D which relates the coefficient vector x of the shifted Legendre series of a given function x(t) with the coefficient vector x ∗ of its delay form x(t— τ) in the form x ∗ = Dx + α, where the elements of a are obtained from the initial function of x(t). Two computational examples are given to illustrate the utility of the method. The availability of recursive algorithms for constructing the delay operational matrix D makes the method particularly attractive to practise.
45 citations
TL;DR: In this paper, a finite-dimensional shifted Legendre polynomials expansion is applied to approximate the solution of linear time-invariant systems with time delay, and an integration matrix and a delay matrix are derived so that the solution can be reduced to a linear algebraic matrix equation.
Abstract: The finite-dimensional shifted Legendre polynomials expansion is applied to approximate the solution of linear time-invariant systems with time delay. An integration matrix and a delay matrix for the shifted Legendre vector are derived so that the solution of a linear time-delay state equation is reduced to the solution of a linear algebraic matrix equation. In addition, parameters of the delayed state equation are also estimated by using the shifted Legendre expansion and the least-squares method. Two examples are given to demonstrate the accuracy of this approach.
39 citations
TL;DR: The separation theory of horizontal thermal diffusion columns with external refluxes, which was developed by Halle and Jury, has been derived by use of an orthogonal expansion technique as discussed by the authors.
Abstract: The separation theory of horizontal thermal diffusion columns with external refluxes, which was developed by Halle and Jury, has been derived by use of an orthogonal expansion technique. Considerable improvement is obtained when the refluxes and feed position are carefully chosen. The present formulation can be extended to other conjugated Graetz problems in continuous-contact countercurrent separation processes with refluxes at both ends.
La theorie de la separation dans des colonnes a diffusion thermique horizontales avec reflux exterieurs, due a Halle et Jury, a ete developpee en utilisant une technique d'expansion orthogonale. On obtient une amelioration considerable lorsqu'on choisit soigneusement la position de l'alimentation et des reflux. On peut etendre cette formulation a d'autres problemes conjugues de Graetz, dans les procedes de separation a contre-courant et contact continu, comportant des reflux aux deux extremites.
36 citations
01 Jan 1985
TL;DR: The Chicago Area Transportation/Land-Use Analysis System (CATLAS) as mentioned in this paper is a large scale urban simulation model which synthesizes location rent analysis from urban economics with travel demand analysis from transportation planning.
Abstract: TheChicago Area Transportation/Land-Use Analysis System (CATLAS) is a large scale urban simulation model which synthesizes “location rent analysis” from urban economics with “travel demand analysis” from transportation planning. This paper describes the theoretical formulation, empirical estimation and policy application of CATLAS to the evaluation of CBD-oriented rapid transit projects in Chicago.
36 citations
TL;DR: In this article, an amorphous silicon n+-i-p+p+i-n+thin-film phototransistor was made on a glass substrate.
Abstract: An amorphous silicon n+-i-p+-i-n+thin-film phototransistor was made on a glass substrate. The p+base is very thin (∼ 200 A) compared with 2000 to 5000 A of the collector i-layer. Therefore, the emitter current which is induced from the photogenerated flux in the collector i-layer is very high. In addition, hole lifetime (minority carrier in the emitter) and transit time are very short, the device possesses fast rise time and fall time of 30 µs, which is mainly governed by the junction capacitance-resistance charging effect and strays.
35 citations
TL;DR: In this article, the authors provide a systematic method for the creation of all possible wheel damping mechanisms based on a parent mechanism, where the original mechanism is generalized into a linkage type kinematic chain according to the rules defined.
30 citations
29 citations
TL;DR: In this article, the operational matrix of integration of a Jacobi vector whose elements are Jacobi polynomials is introduced and then applied to the analysis, parameter estimation and optimal regulator design of time-invariant linear systems.
Abstract: The operational matrix of integration of a Jacobi vector whose elements are Jacobi polynomials is introduced and then applied to the analysis, parameter estimation and optimal regulator design of time-invariant linear systems Illustrative examples are given for demonstration Very satisfactory results are obtained due to rapid convergent property of the Jacobi series The new method is algebraic and computer-oriented
TL;DR: In this article, the photoconduction mechanisms of screen printed CdS films were investigated by their structure and photoresponse characterizations, and it was found that Cl ions were incorporated into the CcS grains and resulted in both the Vcd(Cls)2 complex defect, corresponding to a 0.68 eV trap level, and the Vc(Cl)s complex defect corresponding to an 0.4 eV level.
TL;DR: In this article, the energy balances for basin-type solar distillation with air flowing through the still have been derived and the effects of G and ( t w − t o ) on the modified factor F have been investigated experimentally and a correlation equation derived.
TL;DR: In this paper, the authors examined the performance of an anaerobic fluidized bed system for liquid wastes recovery from liquid wastes, at COD loadings of between 5.8 to 108 kg m−3 day,−1 hydraulic retention times of between 0.45 to 8h, and feed COD concentrations of between 480 to 9000 mg dm−3.
Abstract: The biomass holdup and characteristics of the anareobic fluidised bed system for methane recovery from liquid wastes was examined at COD loadings of between 5.8 to 108 kg m−3 day,−1 hydraulic retention times of between 0.45 to 8h, and feed COD concentrations of between 480 to 9000 mg dm−3. Under these operating conditions, the equilibrium biomass holdups increased with increasing COD loadings and varied from 15000 to 32000 mg VSS dm−3 The distribution of biomass holdup and biofilm thickness in the reactor was relatively uniform, because of the completely mixed conditions maintained and the continuous sloughing of biofilms induced by the effervescence caused by rising methane bubbles. This continuous biofilm sloughing process also eliminated the need for intentional sludge wasting and consequently, the resulting sludge retention time in the reactor decreased with increasing COD loadings. The ability of the anaerobic fluidized bed system to retain a high biomass holdup was clearly demonstrated. As a result this system is ideal for being employed as a high-rate system for methane recovery from liquid wastes, even at low feed COD concentrations.
TL;DR: The numerical response of the neuroglial cells, and the progressive disintegration of the myelin sheaths in the optic nerves, were studied qualitatively and quantitatively in electron-microscopic montages.
Abstract: Adult albino rats were subjected to unilateral surgical removal of the eyeball. After survival times of 7–140 days, the numerical response of the neuroglial cells, and the progressive disintegration of the myelin sheaths in the optic nerves, were studied qualitatively and quantitatively in electron-microscopic montages. The distribution density of microglia and astroglia in degenerating optic nerve increased to peaks after 35 and 56 days respectively, whereas, the oligodendroglia gradually decreased. During the early stage of degeneration, microglial cells appeared and invaded the sheath at the intraperiod line, peeling off the outer lamellae, which were then engulfed by phagocytosis. Within the microglia, myelin sheath fragments were surrounded by a membrane curled to form a myelin ring. In the intermediate stage of degeneration, the paired electrondense lines of the ring, made up of myelin basic protein, decomposed and formed a homogenous or heterogenous osmiophilic layered structure, the myelin body, which, in the final stages, disintegrated and transformed into globoid lipid droplets and needle shaped cholesterol crystals.
TL;DR: The experimental data obtained indicate that the Michaelis-Menten expression is applicable for description of substrate utilisation (i.e. COD removal) in the anaerobic fluidised bed system and the observed biomass yield in the reactor decreases with increasing sludge retention time which is consistent with the prediction of the biokinetic theory developed for suspended-growth systems.
Abstract: The anaerobic fluidised bed system for methane recovery from liquid wastes is modelled as a continuous-flow, completely-mixed homogeneous microbial system, with the feed COD as the limiting substrate concentration. The average microbial residence time in the reactor is defined in terms of conventional sludge retention time. The experimental data obtained indicate that the Michaelis-Menten expression is applicable for description of substrate utilisation (i.e. COD removal) in the anaerobic fluidised bed system. The observed biomass yield in the reactor decreases with increasing sludge retention time which is consistent with the prediction of the biokinetic theory developed for suspended-growth systems. The specific methane production rate observed is a linear function of the specific substrate utilisation rate.
TL;DR: In this article, an amorphous silicon (a-Si) bulk barrier phototransistor was successfully fabricated on a glass substrate and measured optical gain G and electrical current gain H FE are 196 percent and 11.8, respectively.
Abstract: An amorphous silicon (a-Si) bulk barrier phototransistor was successfully fabricated on a glass substrate. The measured optical gain G and electrical current gain H FE are 196 percent and 11.8, respectively. Estimation and measurement methods for G and H FE are discussed.
TL;DR: In this paper, the theoretical and empirical equations for designing basin-type solar distillers with operating pressure reduced have been derived from energy and material balances coupled with experimental data, and a significant improvement in productivity was obtained by reducing the operating pressure in the solar distillation system.
TL;DR: In this article, the shift-legendre polynomial expansion is applied to the analysis and identification of the non-linear system described by a Hammerstein model which consists of a single-valued nonlinearity followed by a linear plant.
Abstract: Applications of the shifted Legendre polynomial expansion to the analysis and identification of the non-linear system described by a Hammerstein model which consists of a single-valued non-linearity followed by a linear plant are studied For the analysis, by using the shifted Legendre polynomial expansion, the solution of a non-linear state equation is reduced to the solution of a linear algebraic matrix equation For the identification, through the shifted Legendre expansions of the measured input-output data, the unknown parameters of both the linear plant and the characterization of the non-linear element are estimated using the least-squares method Algorithms are presented Numerical examples are given to illustrate the use of this approach
TL;DR: In this article, an anaerobic fluidized bed system was designed for the recovery of methane from liquid wastes, when evaluated at COD loadings of between 5.8 to 108 kg m−3 day−1, hydraulic retention times of between 4.45 to 8 h, and feed COD concentrations of beween 480 to 9 000 mg dm−3.
Abstract: COD removal efficiencies in the range 75 to 98% were achieved in an anaerobic fluidised bed system designed for the recovery of methane from liquid wastes, when evaluated at COD loadings of between 5.8 to 108 kg m−3 day−1, hydraulic retention times of between 4.45 to 8 h, and feed COD concentrations of beween 480 to 9 000 mg dm−3. More than 90% of feed COD could be removed up to COD loadings of about 40 kg m−3 day−1. Up to around 300 dm2 of methane were produced per kg COD removed and this methane production rate was independent of the COD loadings applied in this investigation. Volatile acid concentration in the reactor increased sharply at a COD loading of about 40 kg m−3 day−1 and therefore, sufficient alkalinity should be provided to prevent pH from dropping to the undesirable level. The anaerobic fluidised bed system can be operated at a significantly higher liquid throughputs while maintaining its excellent efficiency.
TL;DR: In this paper, the heat transfer characteristics of laminar mixed convection flow over a vertical pin are studied analytically by conjugate convection-conduction theory.
TL;DR: In this paper, separation equations for the enrichment of heavy water in a continuous-flow thermal diffusion column have been derived for low-concentration operations, and experiments on two feed concentrations of the H2O-HDO-D2O system were conducted.
Abstract: Separation equations for the enrichment of heavy water in a continuous-flow thermal diffusion column have been derived for low-concentration operations. Experimentals on two feed concentrations of the H2O-HDO-D2O system have also been conducted, and the results quantitatively confirm the predictions of theory.
TL;DR: In this article, the flow and heat transfer characteristics of combined convection from an isothermal cylinder were investigated by a finite element method, and the results of the pressure distribution and the local Nusselt number were compared with the available experimental correlations and previous numerical investigations.
TL;DR: In this article, a convenient method for bromination or chlorination of 4-unsubstituted sydnone with NBS or NCS in DMF solution was carefully investigated.
Abstract: A convenient method for the bromination or chlorination of 4-unsubstituted sydnone with NBS or NCS in DMF solution was carefully investigated. Tweleve bromo-compounds (yield 74-96%) and seven chloro-compounds (yield 75-93%) were obtained.
TL;DR: 12-HETE could be an important intracellular mediator of the chemotactic action of PDGF on aortic smooth muscle cells, which is a potent chemoattractant for smooth Muscle cells, the present dat strongly suggest.
TL;DR: The three-terminal n+-i-δ(p+)-i-n+V-groove barrier transistor (VBT) has been successfully fabricated by molecular beam epitaxy (MBE).
Abstract: The three-terminal n+-i-δ(p+)-i-n+V-groove barrier transistor (VBT) has been successfully fabricated by molecular beam epitaxy (MBE). The base terminal is connected to the δ(p+), the thin p+layer, by depositing aluminum on the etched V-groove. The demonstrated device possesses high potential of ultra-high-frequency ( f_{r} > 30 -GHz), high-power, and low-noise capability due to carriers transporting by thermionic emission and being controlled by the base-emitter bias.
TL;DR: In this article, the kinetics of cathodic reduction of glucose were studied by a rotating disk electrode at rotation speeds from 500 to 6000 rpm and zero to 2.0 M concentration of glucose.
TL;DR: In this paper, the effect of alloying elements and heat treatments on magnetic properties and microstructures of Fe-Cr-10 wt% Co alloys was studied by magnetic measurements and transmission electron microscopy (TEM).
Abstract: Simplification of z -transfer function is performed in the bilinear-transformed domain via approximating tangent phase function by a Pade technique. A modification has been given to the transformed transfer function so that the reduced z -transfer function has the same zero initial responses as the original system. The simplified z -transfer function is always stable and minimum phase.