T-Systems

About: T-Systems is a based out in . It is known for research contribution in the topics: Cloud computing & Quality of service. The organization has 501 authors who have published 594 publications receiving 8299 citations. The organization is also known as: T-Systems International.

A novel approach to 3-D gaze tracking using stereo cameras

Abstract: A novel approach to three-dimensional (3-D) gaze tracking using 3-D computer vision techniques is proposed in this paper This method employs multiple cameras and multiple point light sources to estimate the optical axis of user's eye without using any user-dependent parameters Thus, it renders the inconvenient system calibration process which may produce possible calibration errors unnecessary A real-time 3-D gaze tracking system has been developed which can provide 30 gaze measurements per second Moreover, a simple and accurate calibration method is proposed to calibrate the gaze tracking system Before using the system, each user only has to stare at a target point for a few (2-3) seconds so that the constant angle between the 3-D line of sight and the optical axis can be estimated The test results of six subjects showed that the gaze tracking system is very promising achieving an average estimation error of under 1/spl deg/

Pan-European optical transport networks: An availability-based comparison

Abstract: The traffic to be carried by today's European backbone networks increases very rapidly. An important portion of this traffic consists of data traffic (mainly IP-related). In the future data traffic is expected to become the abundantly dominant traffic type, while voice traffic will only account for a very small portion of the total traffic volume. In this paper, some network topologies for such a pan-European fiber-optic backbone network are presented (more details can be found in [1]). These topologies are compared in terms of the efficiency of the network design both from a cost and capacity point of view and in terms of the availability of the connections routed over this network. In order to be able to assess the network topologies under realistic circumstances, the expected traffic demand is forecasted. This enables to make the comparison for the current traffic volume as well as for the traffic patterns of the future. As not all types of (data) traffic require the same degree of survivability and in order to leverage the total capacity cost of the network design, a distinction is made between different recovery options in the optical layer for the different traffic types considered.

Energy Consumption of Telecommunication Networks and Related Improvement Options

Abstract: In this study, energy consumption of a universal network operator's broadband telecommunication (TC) network, including the home networks that are required for the use of services over a period of approximately one decade is predicted, whereby it is assumed that no measures for an energy-efficiency increase are taken. It becomes obvious that home networks consume the largest share of energy in TC networks. Concerning the network sections under the responsibility of network operator, highest energy consumption shares are observed in the fixed and mobile access networks with a huge number of distributed network elements in the field. The highest energy consumption growth rates are foreseen in the data centers and IP backbone networks. Methods for reducing energy consumption are being classified and metrics for energy-related assessment of networks are compared. Furthermore, challenges and opportunities for energy-related improvements are discussed with respect to different network sections. A projection into the future shows high-energy-saving potential when combining different energy-reducing methods, such as load-adaptive networking and energy-aware system design. A brief view on related standardization activities shows high interest of standardization bodies in energy consumption of TC networks and confirms its current importance.

Cost modeling and evaluation of capital expenditures in optical multilayer networks

Abstract: Optical multilayer networks offer a high degree of freedom in network design, adapting to actual network requirements (demand types, topologies, etc.) and achieving cost-efficient realizations. Capital expenditures are one of the key differentiators for the evaluation of multilayer networks. A realistic cost model for Internet protocol/multiprotocol label switching (IP/MPLS), carrier-grade Ethernet, synchronous digital hierarchy/optical transport network (SDH/OTN), and WDM equipment from which overall capital expenditures can consistently be derived is contributed and discussed. A comprehensive collection of detailed cost values for different equipment types is presented. Furthermore, the cost model is applied to two case studies, one IP/MPLS-over-WDM study and one WDM study with two topologies, showing substitution effects of network elements to achieve overall capital expenditure minimization.

Comparison of Four Approaches to Age and Gender Recognition for Telephone Applications

Abstract: This paper presents a comparative study of four different approaches to automatic age and gender classification using seven classes on a telephony speech task and also compares the results with human performance on the same data. The automatic approaches compared are based on (1) a parallel phone recognizer, derived from an automatic language identification system; (2) a system using dynamic Bayesian networks to combine several prosodic features; (3) a system based solely on linear prediction analysis; and (4) Gaussian mixture models based on MFCCs for separate recognition of age and gender. On average, the parallel phone recognizer performs as well as Human listeners do, while loosing performance on short utterances. The system based on prosodic features however shows very little dependence on the length of the utterance.