Personal computer

About: Personal computer is a research topic. Over the lifetime, 58809 publications have been published within this topic receiving 800814 citations. The topic is also known as: PC.

The complex propagation constant of multilayer waveguides: an algorithm for a personal computer

Abstract: An algorithm for the calculation of the propagation constant of integrated-optics waveguides is developed. The waveguide may consist of any number of layers with complex refractive indexes due to gain and loss. It allows the additional determination of the field distribution. Thus, all parameters necessary for heterostructure laser development can be calculated. The resulting program was run on a personal computer; numerical results are presented. >

A linear-time algorithm to find modules of fault trees

Abstract: A module of a fault tree is a subtree whose terminal events do not occur elsewhere in the tree. Modules, which are independent subtrees, can be used to reduce the computational cost of basic operations on fault trees, such as the computation of the probability of the root event or the computation of the minimal cut sets. This paper presents a linear time algorithm to detect modules of a fault tree, coherent or not, that is derived from the Tarjan algorithm to find strongly connected components of a graph. The authors show, on a benchmark of real fault trees, that their method detects modules of trees with several hundred gates and events within few milliseconds on a personal computer.

Mobile device which automatically determines operating mode

Abstract: A mobile device such as a cell phone is used to remotely control an electronic appliance such as a television or personal computer. In a setup phase, the mobile device captures an image of the electronic appliance and identifies and stores scale-invariant features of the image. A user interface configuration such as a virtual keypad configuration, and a communication protocol, can be associated with the stored data. Subsequently, in an implementation phase, another image of the electronic appliance is captured and compared to the stored features in a library to identify a match. In response, the associated user interface configuration and communication protocol are implemented to control the electronic appliance. In a polling and reply process, the mobile device captures a picture of a display of the electronic device and compares it to image data which is transmitted by the electronic appliance.

Mobile personal computer with movement sensor

Abstract: A mobile personal computer including a case, a display device, a speech recognition system, a movement sensor, a microprocessor, and a power source. The case is sized for handling by a single, adult human hand and maintains the various other components. The display device is adapted to generate a displayed image. The speech recognition system includes a microphone for collecting sound waves generated by a user's speech. The movement sensor is mounted to the case and is adapted to generate spatial-related information of the case relative to earth. The microprocessor is electronically connected to the display device, the speech recognition system, and the movement sensor. The microprocessor utilizes a personal computer operating system to perform computing operations, and is adapted to transition from a first operational mode to a second operational mode in response to information signaled from the movement sensor.

Colloquium : Trapped ions as quantum bits: Essential numerical tools

Abstract: Trapped laser-cooled atoms and ions are quantum systems which can be experimentally controlled with an as yet unmatched degree of precision. Due to the control of the motion and the internal degrees of freedom, these quantum systems can be adequately described by a well-known Hamiltonian. In this colloquium, powerful numerical tools for the optimization of the external control of the motional and internal states of trapped neutral atoms, explicitly applied to the case of trapped laser-cooled ions in a segmented ion-trap are presented. Inverse problems when optimizing trapping potentials for ions, are solved. The presentation is complemented by a quantum-mechanical treatment of the wave-packet dynamics of a trapped ion. Efficient numerical solvers for both time-independent and time-dependent problems are provided. Shaping the motional wave functions and optimizing a quantum gate is realized by the application of quantum optimal control techniques. The numerical methods presented can also be used to gain an intuitive understanding of quantum experiments with trapped ions by performing virtual simulated experiments on a personal computer. Code and executables are supplied as supplementary online material.