Hewlett-Packard

About: Hewlett-Packard is a company organization based out in Palo Alto, California, United States. It is known for research contribution in the topics: Signal & Layer (electronics). The organization has 34663 authors who have published 59808 publications receiving 1467218 citations. The organization is also known as: Hewlett Packard & Hewlett-Packard Company.

Electronic ticketing system and method

Abstract: A method and system for electronic ticket recognition and acceptance. The method includes the step of facilitating a purchase of an electronic ticket from a networked ticketing computer. Another step is downloading the electronic ticket to a portable computing device having a data output. An additional step is enabling activation of the electronic ticket to communicate the electronic ticket via the data output. This allows the displayed electronic ticket to be optically communicated to a ticket receiving unit.

Multi-wavelength incremental absorbence oximeter

Abstract: Light of two different wavelengths is passed through or reflected from a member of the body so as to be modulated by the pulsatile blood flow therein. The amplitudes of the alternating current components of the logarithms of the respective light modulations are compared by taking their molecular extinction coefficients into account so as to yield the degree of oxygen saturation. By adding a third wavelength of light, the percentage of other absorbers in the blood stream such as a dye or carboxyhemoglobin can be measured. Fixed absorbers reduce the amount of light that passes through or is reflected from the body member by a constant amount and so have no effect on the amplitudes of the alternating current components that are used in making the measurements.

Image processing method and device

Abstract: A method of reconstructing an image captured as a stream of image data, for example as input received from a linear sensor in unconstrained scanning, comprises reconstructing the image in the form of a plurality of tiles. Each tile comprises a pixel grid of predetermined dimension representing a specific spatial region of the image. The tiles tessellate a rectilinear image space. Tiles can be created when required and compressed when no longer active, thus minimizing memory requirements. Devices utilizing this method are provided. The method is especially appropriate for use in an unconstrained hand scanner, but can also be applied to panoramic capture with a digital camera.

Method for tracking configuration changes in networks of computer systems through historical monitoring of configuration status of devices on the network.

Abstract: A tracking system that uses a revision control system (216) and configuration status gathering to historically track and store configuration changes in computers (108) and interconnect devices (106) to aid in managing and troubleshooting networks of computer systems. Configuration data is gathered from devices on the network on a periodic basis. The data collected each collection cycle is stored in a data storehouse (218) on a computer within the network, called the remote support node (102). The data storehouse (218) is comprised of a revision control system (216) and a data base (214). The data is accessed by computers on the network having web browsers. The user selects a first and second collection time, and any changes in configuration of any monitored devices (106, 108) in the network occurring between these two collection times is displayed in the browser window. Configuration changes from different collection cycles may be viewed.

Quality-of-service specification in distributed object systems

Abstract: Traditional object-oriented design methods deal with the functional aspects of systems, but they do not address quality-of-service (QoS) aspects, such as reliability, availability, performance, security and timing. However, deciding which QoS properties should be provided by individual system components is an important part of the design process. Different decisions are likely to result in different component implementations and system structures. Thus, decisions about component-level QoS should commonly be made at design time, before the implementation is begun. Since these decisions are an important part of the design process, they should be captured as part of the design. We propose a general quality-of-service specification language, which we call QML. In this paper we show how QML can be used to capture QoS properties as part of designs. In addition, we extend UML, the de facto standard object-oriented modelling language, to support the concepts of QML. QML is designed to integrate with object-oriented features, such as interfaces, classes and inheritance. In particular, it allows specification of QoS properties through refinement of existing QoS specifications. Although we exemplify the use of QML to specify QoS properties within the categories of reliability and performance, QML can be used for specification within any QoS category - QoS categories are user-defined types in QML. Sometimes, QoS characteristics and requirements change dynamically due to changing user preferences, or changes in the environment. For such situations static specification is insufficient. To allow for dynamic systems that change and evolve over time, we provide a QoS specification runtime representation. This representation enables systems to create, manipulate and exchange QoS information, and thereby negotiate and adapt to changing QoS requirements and conditions.