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Toward disambiguating multiple selections for frustum-based pointing

Toward disambiguating multiple selections for frustum-based ...

引用

IEEE Virtual Reality 2006

作者： Schmidt, Greg Brown, Dennis G. Tomlin, Erik B. Swan II, Edward J. Baillot, Yohan 3D Virtual and Mixed Environments Lab. U.S. Naval Research Laboratory ITT Industries Advanced Engineering and Sciences Department of Computer Science and Engineering Mississippi State University

ISBN: (纸本)1424402247

Selection is a fundamental user operation in 3D environments. These environments often simulate or augment the real world, and a part of that simulation is the ability to select objects for observation and manipulation. Many user interfaces for these applications depend on six-degree-of-freedom tracking devices. Such devices have limited accuracy and are susceptible to noise, giving an imprecision that makes object selections difficult and hard to repeat. This difficulty is amplified when the user's viewpoint is also tracked, meaning the user must compensate for noise from both the head tracker and the pointing device when performing object selection. Also, users may experience fatigue when using handheld pointing devices for extended periods, creating error even if the tracking technology were perfect. This paper presents a pointing-based probabilistic selection algorithm that addresses some of the ambiguities associated with tracking and user imprecision. It performs multiple selections by considering a frustum along the user's pointing direction and the hierarchical structure of the database. It assigns probabilities that the user has selected particular objects using a set of low-level 3D intersection-based selection techniques and the relationship of the objects in a hierarchical database, and makes the final selection using one of several weighting schemes. We performed several experiments to evaluate the low-level selection techniques, tested several weighting schemes for the integration algorithm, and we show that the algorithm is effective at disambiguating multiple selections. © 2006 IEEE.

关键词： computer selection and evaluation

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Achievable sum rate bounds of zero-forcing based linear multi-user MIMO systems 44

Achievable sum rate bounds of zero-forcing based linear mult...

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44th Annual Allerton Conference on Communication, Control, and Computing 2006

作者： Chae, Chan-Byoung Heath, Robert W. Mazzarese, David Dept. of Electrical and Computer Engineering Univ. of Texas Austin AustinTX78712-0240 United States Advanced Research Lab Samsung Electronics Suwon Korea Republic of

ISBN: (纸本)9781604237924

In this paper, jointly optimized linear transmit beamforming and receive processing for the downlink of a multi-user multiple input multiple output (MIMO) system is investigated. In this system the base station, equipped with multiple antennas, transmits to several users, who are also equipped with multiple antennas. To solve the dimensionality constraint imposing by conventional block diagonalization (BD), we propose an iteration based coordinated beamforming (CBF) method and also consider block diagonalization with receive antenna selection (BDRAS) for performance comparison. We show the upper and lower bounds on ergodic sum rate of CBF and BDRAS. Analysis and simulation results show that the proposed beamforming always outperforms conventional BDRAS, and achieves a sum rate close to the MIMO broadcast channel (BC) sum capacity.

关键词： Beamforming

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On designing QoS for congestion control service using neural network predictive techniques

On designing QoS for congestion control service using neural...

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IEEE International Conference on Granular Computing

作者： Xiong, N. Yang, Y. He, Jing He, Yanxiang IEEE Japan School of Information Science Japan Advanced Institute of Science and Technology Japan Department of Computer Science Utah State University Logan UT 84322-4205 United States State Key Lab. of Software Engineering Computer School Wuhan University China

ISBN: (纸本)142440133X

With the ever-increasing data transmission applications recently, considerable efforts have been focused on the design of congestion control scheme for data transmission service to guarantee the quality of service (QoS). The main difficulty in designing an efficient congestion controller for data transmission service stems from the heterogeneous receivers, especially those with large propagation delays in data transfer, which also mean the feedbacks arriving at the source are somewhat outdated and can be harmful to the control actions. This usually leads to a mismatch between the network resources and the amount of admitted traffic. To attack this problem, the present paper describes a novel congestion control scheme that is based on a Back Propagation (BP) neural network technique. We consider a general computer communication model with multiple sources and one destination node. This network-assisted property is different from the existed control scheme in that the data source can predict the dynamic of buffer occupancy of the bottleneck node for which the back control packets experience very long propagation delay and probably cause irresponsiveness of a. data flow. This active scheme makes the control more responsive to the network status. Thus the rate adaptation can be in a timely manner for the sender to react to network congestion quickly. We analyze the theoretical aspects of the proposed algorithm, show how the control mechanism can be used to design a controller to support the data transmission based on feedback of explicit rates' (ER's), and verify this agreement by the simulations. Simulation results show the efficiency of our scheme in terms of quickly response and excellent predictive accuracy.

关键词： neural network applications neural networks traffic control (communication) interconnection networks transportation networks

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Service system resource management based on a tracked layered performance model

Service system resource management based on a tracked layere...

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3rd International Conference on Autonomic Computing, ICAC 2006

作者： Woodside, Murray Zheng, Tao Litoiu, Marin Dept. of Systems and Computer Engineering Carleton University Ottawa K1S 5B6 Canada Centre for Advanced Studies IBM Toronto Lab. Canada

ISBN: (纸本)1424401755

Autonomic computer systems adapt themselves to cope with changes in the operating conditions and to meet the service-level agreements with a minimum of resources. Changes in operating conditions include hardware and software failures, load variation, and variations in user interaction with the system. The self adaptation can be achieved by tuning the software, balancing the load or through hardware provisioning. This paper investigates a feed-forward adaptation scheme, in which tuning and provisioning decisions are based on a dynamic predictive performance model of the system and the software. The model consists of a layered queuing network whose parameters are tuned by tracking the system with an Extended Kalman Filter. An optimization algorithm searches the system configuration space by using the predictive performance model to evaluate every configuration. © 2006 IEEE.

关键词： Autonomous agents

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On control gain selection in PI-RED

On control gain selection in PI-RED

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2006 IEEE International Conference on Networking, Sensing and Control, ICNSC'06

作者： Naixue, Xiong Xavier, Defago Yan, Yang Yanxiang, He Jing, He Asahidai Nomi Ishikawa Japan State Key Lab. of Software Engineering Computer School Wuhan University China School of Information Science Japan Advanced Institute of Science and Technology Japan School of Computer Science and Technology Wuhan University of Science and Technology Hu Bei province China State Key Lab. of Software Engineering Computer School Wuhan University Hu Bei province China Department of Computer Science Utah State University Logan UT 84322-4205 United States

ISBN: (纸本)1424400651

Active Queue Management (AQM) is an effective method used in Internet routers to enhance congestion control, and to achieve a trade off between link utilization and delay. The de facto standard, the Random Early Detection (RED) AQM scheme, and most of its variants use queue length as a congestion indicator to trigger packet dropping. Random early detection (RED) is a widely studied active queue management (AQM) scheme implemented in routers for Internet congestion control. Although certain stability conditions for various RED controllers are discussed, no efficient method for dynamically adapting control gains or result on control gain optimization has been proposed so far. Therefore based on control theory, this paper proposes Proportional and Integral RED (PI-RED) algorithm, that not only considers the average queue length at the current time slot, but also takes into consideration the past average queue lengths within a round trip time. We provides guidelines for the selection of the feedback gains (the proportional parameter and the integral parameter) for TCP/RED system to stabilize the dynamics, make the congested queue converge at a certain target and hence to improve network performance. Simulations demonstrate that indeed satisfactory performance can be achieved if the control gains are selected based on the guidelines. Based on the stability condition and control gains selection method, extensive simulations with ns2 demonstrate that indeed satisfactory performance can be achieved in terms of robustness, drop probability and stability if the control gains are selected based on the guidelines. © 2006 IEEE.

关键词： Control system analysis

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Design and analysis of a self-tuning proportional and integral controller for active queue management routers to support TCP flows

Design and analysis of a self-tuning proportional and integr...

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INFOCOM 2006: 25th IEEE International Conference on computer Communications

作者： Xiong, Naixue Défago, Xavier Jia, Xiaohua Yan, G. He, Yanxiang School of Information Science Japan Advanced Institute of Science and Technology State Key Lab. of Software Engineering Computer School Wuhan University School of Information Science Japan Advanced Institute of Science and Technology 1-1 Asahidai Nomi Ishikawa 923-1292 Japan Kowloon Hong Kong IEEE IEEE Communication Society Department of Computer Science Wuhan University City University of Hong Kong Kowloon Hong Kong School of Computer Science and Technology Wuhan University of Science and Technology China SMIEEE

ISBN: (纸本)1424402212

Active Queue Management (AQM) is an effective method used in Internet routers for congestion control, and to achieve a tradeoff between link utilization and delay. The de facto standard, the Random Early Detection (RED) AQM scheme, and most of its variants use average queue length as a congestion indicator to trigger packet dropping. This paper proposes a novel AQM algorithm, called Self-tuning Proportional and Integral RED (SPI-RED), as an extension of RED. SPI-RED is based on a Self-tuning Proportional and Integral controller, which not only considers the average queue length at the current time point, but also takes into consideration the past average queue lengths during a round-trip time. Furthermore, we give theoretical analysis of the system stability and give guidelines for the selection of feedback gains for the TCP/RED system to stabilize the average queue length at a desirable level. Extensive simulations have been conducted with ns2. The simulation results have demonstrated that the proposed SPI-RED algorithm outperforms the existing AQM schemes in terms of drop probability and stability.

关键词： Queueing networks

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K-QARD: A practical korean question answering framework for restricted domain 21

K-QARD: A practical korean question answering framework for ...

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21st International Conference on Computational Linguistics and 44th Annual Meeting of the Association for Computational Linguistics, COLING/ACL 2006

作者： Song, Young-In Chung, Hoojung Han, Kyoung-Soo Lee, Jooyoung Rim, Hae-Chang Lee, Jae-Won Dept. of Computer Science and Engineering Korea University Seongbuk-gu Seoul136-701 Korea Republic of Computing Lab. Samsung Advanced Institute of Technology Nongseo-ri Giheung-eup Gyeonggi-do Yongin-si449-712 Korea Republic of

We present a Korean question answering framework for restricted domains, called K-QARD. K-QARD is developed to achieve domain portability and robustness, and the framework is successfully applied to build question ans...

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Ubiquitous Robot: Recent Progress and Development

Ubiquitous Robot: Recent Progress and Development

引用

SICE Annual Conference

作者： Jong-hwan Kim Robot Intelligence Technology Lab Department of Electrical Engineering and Computer Science Korea Advanced Institute of Science and Technology South Korea

Summary form only for tutorial. This paper provides an overview on the recent progress and developments in the development of the ubiquitous robot. First the concepts of the ubiquitous robot, which incorporates the software robot (Sobot), embedded robot (Embot) and mobile robot (Mobot), are presented. The Ubiquitous robot, Ubibot, comprising of a core intelligence of a Sobot Rity, perceptive abilities through a variety of Embots, and a personal robot type Mobot called Mybot is presented. Rity, an artificial creature testing robot genome is described in detail including the technique for creating the chromosome which dictates its personality and traits. The technique for evolving a new personality, thus creating a Genetic Robot, is also briefed upon. The nearly limitless possibilities evident in this new paradigm in robotics can be obviously seen.

关键词： Intelligent robots Mobile robots Service robots Robot sensing systems Competitive intelligence Orbital robotics Embedded software Context awareness Artificial intelligence Genomics

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Timed Petri Nets Modelling of High-Throughput Screening Process for Fault Study

Timed Petri Nets Modelling of High-Throughput Screening Proc...

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Annual Conference of Industrial Electronics Society

作者： Tao Hong Mo-Yuen Chow Advanced Diagnosis Automation and Control Lab Electrical & Computer Engineering Department North Carolina State University Raleigh NC USA

To perform fault studies (e.g., fault detection, diagnosis, and mitigation) via Internet for a remote automation line, operation time is an important feature/symptom for human supervisors. This paper introduces the application of timed Petri nets (TPN) to model a high-throughput screening (HTS) process, and extends the timed transition based on the dynamics of the automated process. This paper describes the design methodologies of TPN to model the dynamics of the HTS process with and without anomalies. Finally, both healthy and faulty conditions of an automated biological/chemical screening line are simulated in Matlab/Simulink to demonstrate the effectiveness of the proposed TPN modelling

关键词： Petri nets Mathematical model Biological system modeling High temperature superconductors Fault detection Fault diagnosis Internet Automation Humans Design methodology

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Robust moving object segmentation in the compressed domain for H.264/AVC video stream

Robust moving object segmentation in the compressed domain f...

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25th PCS: Picture Coding Symposium 2006, PCS2006

作者： Yang, Gaobo Yu, Shengfa Zhang, Zhaoyang Network and Information Security Lab School of Computer and Communication Hunan University Changsha Hunan 410082 China School of Electronic Science and Engineering National University of Defense Technology Changsha Hunan 410073 China Key Laboratory of Advanced Displays and System Application Shanghai University Ministry of Education Shanghai 200072 China

ISBN: (纸本)300018726X

Moving object segmentation in the compressed domain plays an important role in many real-time applications, e.g. video indexing, video surveillance, etc. H.264/AVC is the up-to-date video coding standard, which employs several new coding tools and provides a different video format. In this paper, a robust spatio-temporal segmentation approach to extract moving objects in the compressed domain for H.264 video stream is proposed. Coarse moving objects are firstly extracted from the motion vector field through the MRF classification process. Spatial segmentation is based on the HT coefficient, which is used to refine the object boundary of temporal segmentation results. Fusion of spatio-temporal segmentation is based on region projection based labeling technique. Further edge refinement is performed to smooth the object boundaries. The performance of the proposed approach is illustrated by simulation carried on several test sequences. Experimental results show that the proposed approach can provide the visually similar results as by using spatial domain process with much less computational complexity.

关键词： Image segmentation

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