We present a general method for using automatic diierentiation to facilitate model sensitivity analysis. Automatic diierentiation techniques augment, in a completely mechanical fashion, an existing code such that it also simultaneously and eeciently computes derivatives. Our method allows the sensitivities of the code's outputs to its parameters and inputs to be determined with minimal human ee...

In this paper we describe the implementation of a numerical weather forecast model on a massively parallel computer system. This model is a production code used for routine weather forecasting at the meteorological institutes of several European countries. The modi cations needed to achieve a data-parallel version of this model without explicit message passing are outlined. The achieved perform...

Abstract Nowadays, transmitting and receiving data with high speed a level of security are the main demands. So, new model spectral amplitude coding optical code division multiple access (SAC-OCDMA) is suggested in this paper, based on free space (FSO) communication system using coherent sources. Three different codes: enhanced double weight (EDW), modified (MDW) multi-diagonal (MD) codes assig...

Brain time and phenomenological time (draft) As 'tis from the disposition of visible and tangible objects we receive the idea of space, so from the succession of ideas and impressions we form the idea of time...-David Hume, Treatise of Human Nature ... space and time ... are therefore pure intuitions that lie a priori at the basis of the empirical. ... they are mere forms of our sensibility, wh...

Based on the findings of Massachusetts Institute of Technology, organizations’ data double every five years. However, the rate of using data is 0.3. Nowadays, data mining tools have greatly facilitated the process of knowledge extraction from a welter of data. This paper presents a hybrid model using data gathered from an ATM manufacturing company. The steps of the research are based on CRISP-D...

We introduce “Hybrid Fortran”, a new approach that allows a high performance GPGPU port for structured grid Fortran codes. Œis technique only requires minimal changes for a CPU targeted codebase, which is a signi€cant advancement in terms of productivity. It has been successfully applied to both dynamical core and physical processes of ASUCA, a Japanese mesoscale weather prediction model with m...

This paper describes the experience gained while parallelizing the global medium range weather forecasting application called TSO on a PARAM machine based on a distributed memory parallel architecture. The TSO code employs the spectral method for horizontal directions and finite differencing in the vertical direction and time marching. The parallel implementation takes care of the easy portabil...

Performance and portability are important but conflicting concerns in the development of the Weather Research and Forecast model, a next−generation community mesoscale model for numerical weather prediction and atmospheric research. Efficiency depends on the ability to realize significant percentages of peak processor performance, yet without hyper−engineering the codes for a particular brand o...

Provisions concerning intact ship stability have been introduced at a later stage in international regulations of ship safety. The General Stability Criteria based on righting arm characteristics was adopted in 1968 and the Weather Criterion was adopted in 1985. Both criteria were based on ideas, concepts and ship typologies/dimensions, existing long before their adoption, so that the need of t...