Hewlett-packard Development Company, L.p.

Zynga Inc.

Hewlett-packard Company

Bea Systems, Inc.

Hans Wolters

Girish Keswani

Jim Baer

Daniel George Gelb

Thomas Malzbender

Craig Michael Wittenbrink

Marc McEachern

Charles Paclat

Sougata Mukherjea

Greg Buzzard

Dan Fishman

A method and a system for predicting churn of a player of an online game is described. Online engagements of a group of players of the online game are monitored during a churn prediction model training period. Online engagement scores for the group of players are computed within a periodic number of days within the churn model training period. A weighted exponential moving average of the online engagement scores of the group of players of the online game is computed during the churn model training period. The weighted exponential moving average is used to determine an online engagement threshold value of a churn prediction model for the online game. The online engagement threshold value is applied to a weighted exponential moving average of a player during an observation period to determine a churn probability of the player within a prediction period.

Method to detect and score churn in online social games

Disclosed is a method of targeting a multi-cast message, comprising the steps of gathering user information related to one or more users, categorizing the user information into one or more interest categories, associating respective ones of the users with ones of the interest categories, receiving service information from a service provider, determining an association between the received service information and ones of the interest categories to determine at least one associated interest category, selecting users using the at least one associated interest category to determine selected users and communicating the received service information to the selected users using the multi-cast message.

System for and method for dispatching service messages over a multicast network

A method for providing user-apparent consistency in a wireless user device is presented. An IP address, or other unique identifier, is assigned to a wireless user device in wireless communication with a wireless application server. The IP address is associated with a communication session between the wireless user device and the wireless application server. The IP address, along with information related to the communication session, such as context information, is stored by the wireless application server, such as in an active session cache. The wireless user device may then rejoin the communication session in the event the wireless communication is temporarily dropped and re-established between the wireless user device and the wireless application server, without losing the assignment of the IP address to the wireless user device or any information stored for the IP address in the active session cache.

Method for providing user-apparent consistency in a wireless device

An apparatus for semiautomatic classification of volume data provides the ability to generate visually significant representations of the important regions of the data set. The representations may be indicated by opacity or color changes, for example. The apparatus comprises programming to compute a two-dimensional (2D) histogram over a volume of scalar values, &#x192;, versus edge values edge( ). A common edge value is the gradient magnitude, edge ( )=|&#x2207;&#x192;|.

Apparatus and method for semi-automatic classification of volume data

A graphics system that enhances shape perception. The presently preferred embodiment of the system utilizes the mathematical machinery of parametric texture maps. In general, parametric texture maps allow the graphics system to render surface features of a 3D object in a manner that is direction dependent but without the time consuming and expensive calculations involved in the evaluation of lighting equations on a per pixel basis. A parametric texture map holds a set of parameters that define a surface structure in a manner in which the appearance of the surface structure varies in response to a direction vector. The direction vector may be any user-defined vector including a light source vector or a half-angle vector. The parameters are those of a predetermined equation, the evaluation of which does not involve vector calculations. The equation may take any form including a polynomial equation or a non-polynomial equation. The graphic system renders a polygon with the surface structure using the equation.

Apparatus for and method of enhancing shape perception with parametric texture maps

A graphics system that employs parametric texture maps that are converted from height fields. The system samples a hemisphere equidistantly to produce an array of normals, approximates a dot product of each sampled normal with an arbitrary unit vector, transforms the polynomials back to canonical basis, converts a height field to normals, and for each normal in the height field determines coefficients for a parametric texture map. The system then evaluates a diffuse contribution using the parametric texture map coefficients. The system may also then evaluate a specular contribution using the parametric texture map coefficients. The graphics system renders surface features of a 3D object in a manner that is direction dependent but without the time consuming and expensive calculations involved in the evaluation of lighting equations on a per pixel basis. A parametric texture map holds a set of parameters that define a surface structure in a manner in which the appearance of the surface structure varies in response to a direction vector. The direction vector may be any user-defined vector including a light source vector or a half-angle vector. The parameters are those of a predetermined equation, the evaluation of which does not involve vector calculations. The equation may take any form including a polynomial equation or a non-polynomial equation. The graphic system renders a polygon with the surface structure using the equation.

Apparatus for and method of converting height fields into parametric texture maps

A graphics system that employs parametric texture maps. The graphics system renders surface features of a 3D object in a manner that is direction dependent but without the time consuming and expensive calculations involved in the evaluation of lighting equations on a per pixel basis. A parametric texture map holds a set of parameters that define a surface structure in a manner in which the appearance of the surface structure varies in response to a direction vector. The direction vector may be any user-defined vector including a light source vector or a half-angle vector. The parameters are those of a predetermined equation, the evaluation of which does not involve vector calculations. The equation may take any form including a polynomial equation or a non-polynomial equation. The graphic system renders a polygon with the surface structure using the equation.

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Mountain View, CA, United States of America

Hans Wolters