We study how neuronal connections in a population of spiking neurons affect the accuracy of stimulus estimation. Neurons in our model code for a one-dimensional orientation variable phi. Connectivity between two neurons depends on the absolute difference absolute value(phi - phi') between the preferred orientation of the two neurons. We derive an analytical expression of the activity profile fo...

Evaluation of the torsional vibration characteristics of a crankshaft system is indispensable to the development of marine diesel engines. It influences the selection or decision about shafting components such as the flywheel, torsional damper, generator and even modification of the crankshaft itself. In this paper, experimental and analytical investigations of torsional vibration were carried ...

The analytical proportional-integral-derivative (PID) controllers, the tuning of which depends on simple formulas with one adjustable parameter, have been developed for processes with time delay. In this paper, using a simple method called dual-locus diagram, the solutions to the problems of stabilizing stable, integrating and unstable processes with time delay using analytical PID controllers ...

The object identifier index of an object-oriented database system is typically 20% of the size of the database itself, and for large databases, only a small part of the index fits in main memory. To avoid index retrievals becoming a bottleneck, efficient buffering strategies are needed to minimize the number of disk accesses. In this report, we develop analytical cost models which we use to fin...

Designing and tuning parallel applications with MPI, particularly at large scale, requires understanding the performance implications of different choices of algorithms and implementation options. Which algorithm is better depends in part on the performance of the different possible communication approaches, which in turn can depend on both the system hardware and the MPI implementation. In the...

In this paper we address the throughput analysis of high-speed IEEE 802.11b WLANs from both an analytical and simulative perspective. Specifically, we derive the throughput formula for the RTS/CTS Access method of the p-persistent IEEE 802.11b MAC protocol. The accuracy of the proposed model is exhaustively validated via simulative results. By exploiting our formulas, we derive the theoretical ...

When a computer system is expensive to use or is not often available, one may want to tune software for it via analytical models that run on more common, less costly machines. In contrast, if the host system is readily available, the attraction of analytical models is far less. One instead employs the actual system, testing and tuning its software empirically. Two examples of code scalability t...

The students of Visual Neuroscience have diverse backgrounds and are often not familiar with quantitative techniques. As a result, professors have problems to convey experimental and theoretical concepts that are mathematical in nature. Traditional (analytical) approaches used in physics or engineering are not appropriate for bio-oriented students. In this series of papers devoted to the Visual...

In an uncoupled parallel array of bistable dynamical elements subject to a common noisy subthreshold rectangular signal, the signal-to-noise ratio (SNR) gain can be improved by tuning the internally added array noise. A SNR gain above unity is observed in certain regions of the array noise intensity. The maximum SNR gain is obtained as the size of the array goes to infinity. This form of stocha...

To avoid OID index retrieval becoming a bottleneck, eecient buuering strategies are needed to minimize the number of disk accesses. In this paper, we develop analytical cost models which we use to nd optimal sizes of the index page buuer and the index entry cache, for diierent memory sizes, index sizes, and access patterns. Because existing buuer hit estimation models are not applicable for ind...