Intelligent tutors have become increasingly accurate at detecting whether a student knows a skill, or knowledge component (KC), at a given time. However, current student models do not tell us exactly at which point a KC is learned. In this paper, we present a machine-learned model that assesses the probability that a student learned a KC at a specific problem step (instead of at the next or pre...

This paper proposes a new mechanics-based model for the seismic design of beam-to-column panel zone joints in steel moment-resisting frames. The is based on realistic shear stress distributions retrieved from continuum finite element (CFE) analyses representative geometries. Comparisons with comprehensive experimental data set suggest that proposed predicts stiffness and strength noteworthy acc...

diversion dams in order to raise the water level of river and conveys of water into the main canal irrigation network is designed. if the dimensions of different parts of the diversion dam be considered large, stability will be supplying, but due to the increase volume of materials, construction costs will be more. design engineer must choose sections of dam that had least amount of materials a...

statistical frequency analysis is the most common procedure for the analysis of flood data at a gauged location thatin first step it is needed to select a model to represent the population. among them, the central moment has been themost common and widely used, and with the using of computers, the application of the maximum likelihood hasincreased. this research was carried out in order to reco...

Towards measuring the meridional overturning circulation from space D. Cromwell, A. G. P. Shaw, P. Challenor, R. Houseago-Stokes, and R. Tokmakian Ocean Observations and Climate, National Oceanography Centre, Southampton (NOCS), UK Naval Postgraduate School, Monterey, California, USA Received: 20 September 2006 – Accepted: 3 October 2006 – Published: 6 October 2006 Correspondence to: D. Cromwel...

An accurate three-dimensional numerical model, applicable to strongly non-linear waves, is proposed. The model solves fully non-linear potential flow equations with a free surface using a higher-order three-dimensional boundary element method (BEM) and a mixed Eulerian–Lagrangian time updating, based on second-order explicit Taylor series expansions with adaptive time steps. The model is applic...

Tropical meridional ocean heat transport is studied in six coupled ocean-atmosphere models in which atmospheric CO 2 concentration has been increased. In the Indo-Pacific, the strength of Subtropical Cells (STCs) changes in response to changes in the trade winds. However, the change is not consistent among models. In contrast, in all models the tropical Indo-Pacific heat transport remains nearl...

Despite a real risk of overturning, for the Self-Propelled agricultural Machinery (SPM) the ROPS approach to protect the driver is rather recent. Due to the several SPM categories available on the market, characterized by very different mass, dimension and working functions, the fitting of a ROPS and consequently the check of its strength is complicated. The SPM could be preliminarily divided i...