ISSN:0253-3839    

DOI:10.1080/02533839.1992.9677396

出版商:Taylor & Francis Group    

年代:1992

数据来源: Taylor

摘要:

For the cardiovascular survey work in Taiwan, the conventional portable electrocardiogram (ECG) recorder is still the most convenient tool. In order to analyze and classify the large amount of ECG records on the recording paper charts more precisely and consistently, computerized ECG feature extraction and Minnesota Code based coding algorithms may be used. However, the first thing that must be done is to digitize the ECG waveforms on the recording paper charts automatically and precisely.

ISSN:0253-3839    

DOI:10.1080/02533839.1992.9677397

出版商:Taylor & Francis Group    

年代:1992

数据来源: Taylor

摘要:

In this paper, a new method of sharing a circular storage area for multiple stacks is proposed. Our method allocateskalmost equal‐sized stacks into a fixed‐size circular storage area so as to make the best use of the storage space. We find that the storage utilization of our algorithm is better than those of Knuth [6], Garwick [6], and Yang et al.’s bigroup system and multigroup system [8].

ISSN:0253-3839    

DOI:10.1080/02533839.1992.9677398

出版商:Taylor & Francis Group    

年代:1992

数据来源: Taylor

摘要:

In this paper, we study an adaptive load balancing algorithm in the homogeneous distributed systems in which only the local status information is used. The parameters affecting the performance of the load balancing algorithm are investigated. In order to analyze the effects of service disciplines of the processor, we study two service disciplines: first come first serve and priority queueing. All tasks in the system are treated the same in the former discipline. The latter discipline divides tasks into two classes, local tasks and remote tasks, and assigns different priorities to them. Five priority queueing disciplines are compared. We use the Z‐transform and the Matrix‐Geometric solution techniques in the mathematical queueing analysis. The simulation results and the numerical results are presented and used to shed light on the characteristics of the load balancing process. Finally, we compare the results from these two approaches and investigate the accuracy of the analytic modeling.

ISSN:0253-3839    

DOI:10.1080/02533839.1992.9677399

出版商:Taylor & Francis Group    

年代:1992

数据来源: Taylor

摘要:

We present an application‐specific computer‐aided design (ASCAD) tool that aids the design of easily testable bit‐level cellular array multipliers, including bit‐serial, bit‐parallel, and block multipliers. The tool, based on a nonlinear space‐time transformation algorithm and bit‐level cellular array architectures, is a very high‐level one. A multiplier designer only needs to specify (1) the multiplicand and the multiplier word lengths, (2) the throughput range, and (3) the multiplier type. The tool then generates a VLSI circuit layout for the multiplier which meets the designer's specifications, and the circuit is guaranteed to be functionally correct. Our ASCAD tool thus eliminates the design and verification costs associated with manual design. Because it is application‐specific, the tool itself is very easy to implement.

ISSN:0253-3839    

DOI:10.1080/02533839.1992.9677400

出版商:Taylor & Francis Group    

年代:1992

数据来源: Taylor

摘要:

The noise barrier problem is simulated by a still, single frequency, three dimensional sound source located within two parallel porous medium layers with rigid back walls. The solution of the reflection sound field is represented by an asymptotic solution which is derived by the method of steepest descent. We find that there is a viscous damping factor α for the porous medium layer of the noise barrier which affects the trapping and absorption of sound waves. Because there exists a layer similar to Stokes boundary layer in fluid mechanics due to the variation of thickness of the porous medium, we also find that it will be a waste if the porous medium used is too thick. The optimum choice of noise barrier which minimizes reflection within parallel noise barriers, according to the numerical results, is α = 1, while the layer thickness‐to‐wave length ratiod/λ= 1/4. We also find that increasing the height of the noise barrier in order to improve its noise control effect is not economical.

ISSN:0253-3839    

DOI:10.1080/02533839.1992.9677401

出版商:Taylor & Francis Group    

年代:1992

数据来源: Taylor

摘要:

This paper presents a new algorithm for finding efficient schedules with respect to total flowtime and maximum tardiness. A detailed comparison is made between this algorithm and the well‐known Van Wassenhove and Gelders’ algorithm (VGA) on a variety of problem sizes, up to 100 jobs. Computational results show that the proposed algorithm is of considerable value, especially for large problems. In particular, for the 10‐job problem the proposed algorithm requires roughly one‐half the computation time of VGA, and for the 100‐job problem the ratio reduces to one to sixteen.

ISSN:0253-3839    

DOI:10.1080/02533839.1992.9677402

出版商:Taylor & Francis Group    

年代:1992

数据来源: Taylor

摘要:

The boundary element method is applied to study the scattering of P, SV, and Rayleigh waves by topographical irregularities. The fundamental solution of a full plane is adopted for the boundary integral equations and the free surface condition is expressed by using additional boundary elements.

ISSN:0253-3839    

DOI:10.1080/02533839.1992.9677403

出版商:Taylor & Francis Group    

年代:1992

数据来源: Taylor

摘要:

Pi‐coefficients [4] provide a quantitative measure of system stability. With the goal of finding the largest stability range of the feedback gain in a system, the max‐pproblem [9] can be formulated so that its solution gives an optimal set ofpi‐coefficients. This paper simplifies the max‐pproblem by analyzing the special structure of a negative semi‐definite matrix, called theM‐matrix. To find the optimalpi‐coefficients of the general second‐order systems, seven solutions corresponding to different conditions are derived. In the examples we apply the results to a model reference adaptive system, calculate the pi‐coefficients of its error dynamics model, and use the optimalpi‐coefficient curves to determine a good sampling period.

ISSN:0253-3839    

DOI:10.1080/02533839.1992.9677404

出版商:Taylor & Francis Group    

年代:1992

数据来源: Taylor

摘要:

This paper describes numerical and experimental studies on the pressure loss characteristics of the flow through stacked screens. The flow through each screen is simulated as a core outside a boundary layer developing along the surface of the wire consisting of the screen. Within the core, the flow is modeled as one‐dimensional for simplicity, and as two‐dimensional for a more realistic model. The jet emerging from each aperture of the screen is assumed to reattach with its neighboring counterparts before reaching the next screen. Both numerically predicted and measured results show that pressure loss coefficient increases with Mach number. The increase is sharp at choking. For a given Mach number, increasing Reynolds number has the effect of decreasing pressure loss coefficient. The empirical expression for the pressure loss coefficient derived from the flow through single gauzes is found to be applicable to the case of flow through stacked screens.

ISSN:0253-3839    

DOI:10.1080/02533839.1992.9677405

出版商:Taylor & Francis Group    

年代:1992

数据来源: Taylor