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Towards solving the missing marker problem in realtime motion capture

Towards solving the missing marker problem in realtime motio...

ASME 2009 International Design engineering Technical Conferences and computers and Information in engineering Conference, IDETC/CIE2009

作者： Piazza, Tommaso Lundström, Johan Hugestrand, Alexander Kunz, Andreas Fjeld, Morten T2I Lab. Dept. of Computer Science and Engineering Chalmers University of Technology Sweden Dept. of Mechanical and Process Engineering Swiss Federal Institute of Technology Switzerland

ISBN: (纸本)9780791848999

A common problem in optical motion capture is the so-called missing marker problem. The occlusion of markers can lead to significant loss of tracking accuracy unless continuous data flow is guaranteed by computationally demanding interpolation or extrapolation schemes. Since interpolation algorithms require data sampled before and after an occlusion, they cannot be used for real-time applications. Extrapolation algorithms only require data sampled before an occlusion. Other algorithms require statistical data and are designed for post-processing. In order to bridge sampling gaps caused by occluded markers and hence to improve 3D real-time motion capture, we suggest a real-time extrapolation algorithm. The realization of this prediction algorithm does not need statistical data or rely on an underlying cinematic human model with pre-defined marker distances. Under the assumption that natural motion can be linear, circular, or a linear combination of both, a prediction method is suggested and realized. The paper presents linear and circular movement measurements for use when a marker is briefly lost. The suggested extrapolation method seems to behave well for a reasonable number of frames, not exceeding 200 milliseconds. © 2009 by ASME.

关键词： Interpolation

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Towards supply-grid-based derating of timing margins

Towards supply-grid-based derating of timing margins

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2009 IEEE Workshop on Signal Propagation on Interconnects, SPI '09

作者： Svensson, Lars Pihl, Johnny Andersson, Daniel A. Nilsson, Björn Larsson-Edefors, Per Dept. of Computer Science and Engineering Chalmers University of Technology SE-412 96 Gothenburg Sweden Atmel Norway AS Vestre Rosten 79 7075 Tiller Norway

ISBN: (纸本)9781424444892

We investigate the influence of a realistic supply voltage network on the timing margins for a commercially-available 32-bit processor chip. Detailed models of the supply network and switching activity produce a spatial map of the supply voltage waveforms. We relate these waveforms to the expected excess logic delays, and estimate the required derating of the critical setup paths. ©2009 IEEE.

关键词： Timing circuits

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Supply voltage drop study considering on-chip self inductance of a 32-bit processor's power grid

Supply voltage drop study considering on-chip self inductanc...

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2009 IEEE Workshop on Signal Propagation on Interconnects, SPI '09

作者： Andersson, Daniel A. Nilsson, Björn Pihl, Johnny Svensson, Lars. Larsson-Edefors, Per Atmel Norway AS Vestre Rosten 79 7075 Tiller Norway Dept. of Computer Science and Engineering Chalmers University of Technology SE-412 96 Gothenburg Sweden

ISBN: (纸本)9781424444892

Conventional IR drop analysis suggests that on-chip inductive effects can be neglected when estimating supply voltage drops. We present a supply voltage drop analysis for a commercial 32-bit application processor. Our power grid model uses a backbone RL extracted netlist of the processor's power grid, complemented with capacitances from the processor design and a current signature defined by the worst-case switching test vector, located in the power-up sequence of the processor. Our circuit simulations show that on-chip self inductance makes the actual supply voltage drop deviate by more than 55% and 25% from the ∼6% and ∼8% drop, respectively, of nominal supply voltage that a conventional IR power grid model yields. ©2009 IEEE.

关键词： Inductance

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Acceptance of Integrated Active Safety Systems in China

Acceptance of Integrated Active Safety Systems in China

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第十七届国际工效学大会暨中国人类工效学学会成立20周年庆祝大会

作者： Anders Lindgren Paul Alvarado Mendoza Interaction Design Collegium Department of Computer Science and Engineering Chalmers University of TechnologySweden

Yearly Almost 80,000 people are killed in traffic accidents in China due to the rapid growth of the number of *** safety has become one of the most important social problems that need to be *** data findings show that driver behaviors are a part of the main contributing factor related to traffic *** is a need to increase safety and cars are being equipped with new active safety technology known as Advanced Driver Assistant Systems(ADAS) that helps by warning drivers before accidents occur.A simulator study with 16 participants was carried out using a driving simulator and an integrated visual interface prototype developed by chalmers university of technology in Sweden. The interface presents information visually to the driver before any critical situation with help from three Advanced Driver Assistance Systems,Forward Collision Warning(FCW),Curve Speed Warning(CSW) and Lane Departure Warning(LDW).The prototype also provides critical sound warnings for FCW(if the driver is too close to the car in front),CSW(the driver has too high speed entering a curve) and LDW (when a lane departure occurs and the turn-lights are not used).Questionnaires and open-ended interviews were held to subjectively measure the participants' attitude toward the sound warnings and visual *** results showed that most participants thought the sound warning could facilitate their driving while most users' attitude towards the visual display warning were comparatively neutral. The majority of participants accepted the sound warnings and believed that they could help them perceive the potential danger in real driving *** results also showed that the sound warning system design needed to be improved as well,e.g.,many participants thought the sound warning occurred too frequently,especially for experienced *** is a need to conduct further studies to better understand how ADAS technology can be designed to suite Chines

关键词： Acceptance of Integrated Active Safety Systems in China Active

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A Recursive Framework for Manufacturing Control

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IFAC Proceedings Volumes 2009年第4期42卷 600-605页

作者： Sven-Arne Andréasson Department of Computer Science and Engineering Chalmers University of Technology S-412 96 Göteborg SWEDEN

The CHAMP (chalmers Architecture and Methodology for Flexible Production) system is a general control system for manufacturing that can be configured for arbitrary production. The same system can be used recursive at different levels of the production. The system consists of producers that can perform operations on products and movers that can move products between producers. Each product is described by a number of operations that are mapped to global operations in the database. Thus a flexible production can be designed only by defining the product recipes and the factory layout.

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Double Throughput Multiply-Accumulate unit for FlexCore processor enhancements

Double Throughput Multiply-Accumulate unit for FlexCore proc...

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International Symposium on Parallel and Distributed Processing (IPDPS)

作者： Tung Thanh Hoang Magnus Sjalander Per Larsson-Edefors Department of Computer Science and Engineering Chalmers University of Technology Gothenburg Sweden

As a simple five-stage General-Purpose Processor (GPP), the baseline FlexCore processor has a limited set of datapath units. By utilizing a flexible datapath interconnect and a wide control word, a FlexCore processor is explicitly designed to support integration of special units that, on demand, can accelerate certain data-intensive applications. In this paper, we propose the integration of a novel Double Throughput Multiply-Accumulate (DTMAC) unit, whose different operating modes allow for on-thefly optimization of computational precision. For the two EEMBC benchmarks considered, the FlexCore processor performance is significantly enhanced when one DTMAC accelerator is included, translating into reduced execution time and energy dissipation. In comparison to the 32-bit GPP reference, the accelerated 32-bit FlexCore processor shows a 4.37times improvement in execution time and a 3.92times reduction in energy dissipation, for a benchmark with many consecutive 16-bit MAC operations.

关键词： Throughput Integrated circuit interconnections Energy dissipation Acceleration Microarchitecture computer science Data engineering LAN interconnection Process design System-on-a-chip

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Micro-architectural power estimation and optimization

Micro-architectural power estimation and optimization

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IEEE International Conference on Electro-Information technology

作者： Babak Hidaji Mohamad Reza Andalibizadeh Salar Alipour Computer Science and Engineering department Chalmers University of Technology Gothenburg Sweden

Today power optimization is an important field of research due to the increasing need for less power consumption, dramatic decrease of circuit's MTBF on high temperature and cooling difficulties. It is investigated that only 30% improvement in battery performance will be obtained in five years. This paper is an overview on power estimation and optimization researches and the overall flow of presenting the information is based on the reference. We review the architectural template and the methods to provide model for power consumption of different types of components. Some common optimization techniques including clock-gating, exploiting the common case of the design and managing voltage are being reviewed.

关键词： Clocks Equations Energy consumption Design optimization Capacitance Buildings Power dissipation Structural engineering Sequential circuits Remuneration

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Securing Timeout Instructions in Web Applications

Securing Timeout Instructions in Web Applications

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computer Security Foundations Workshop

作者： Alejandro Russo Andrei Sabelfeld Department of Computer Science and Engineering Chalmers University of Technology Goteborg Sweden

Timeout mechanisms are a useful feature for web applications. However, these mechanisms need to be used with care because, if used as-is, they are vulnerable to timing attacks. This paper focuses on internal timing attacks, a particularly dangerous class of timing attacks, where the attacker needs no access to a clock. In the context of client-side web application security, we present JavaScript-based exploits against the timeout mechanism of the DOM (document object model), supported by the modern browsers. Our experimental findings reveal rather liberal choices for the timeout semantics by different browsers and motivate the need for a general security solution. We propose a foundation for such a solution in the form of a runtime monitor. We illustrate for a simple language that, while being more permissive than a typical static analysis, the monitor enforces termination-insensitive noninterference.

关键词： Monitoring Timing Java Information security Context modeling Application software Clocks Runtime Data security computer security

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Using Hoarding to Increase Availability in Shared File Systems

Using Hoarding to Increase Availability in Shared File Syste...

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International Conference on computer and Information science (ACIS)

作者： Jochen Hollmann Per Stenstrom Department of Computer Science and Engineering Chalmers University of Technology Goteborg Sweden

Many mobile devices have reached the point where the users' (active) working set is smaller than the amount of storage available and that trend is likely to continue. Currently these resources are made available for recording new data, but we think that we could make better use of this capacity. Hoarding previously not accessed data could give better data coverage in cases of disconnected operation, when wireless networks are not available or access to them is expensive. We gathered a trace from a university file system used by more than 5000 people over a period of 16 months. This trace is used to drive a simulation model of distributed file systems. This paper studies a novel hoarding scheme that uses the access profile of other users to predict what files a user would need in the future. This hoarding scheme is shown to avoid between 30% and 75% of remote file accesses to files that are accessed for the first time. Furthermore, hoarded but not used data can be expired, because we note experimentally that the population shifts focus each month.

关键词： File systems Wireless networks Switches File servers Network servers Information science computer science Mobile computing Drives Wire

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Layout exploration of geometrically accurate arithmetic circuits

Layout exploration of geometrically accurate arithmetic circ...

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IEEE International Conference on Electronics, Circuits and Systems (ICECS)

作者： Kasyab P Subramaniyan Emil Axelsson Per Larsson-Edefors Mary Sheeran Department of Computer Science and Engineering Chalmers University of Technology Gothenburg Sweden

ISBN: (纸本)9781424450909;9781424450916

High-performance arithmetic circuits are critical to overall design performance and are therefore designed using full-custom design techniques. However, this is a time-consuming and error-prone task. We present a novel layout exploration methodology to design arithmetic circuits using standard-cell techniques, that retains competitive performance while allowing an almost custom-design kind of control over the layout. It uses an unconventional approach with a Haskell-based front-end in the Wired system, designed to produce logically and topologically accurate circuit descriptions and at the same time be parameterizable. Further, another overall goal of the system was to keep implementation time as low as possible. We demonstrate this methodology on HPM multipliers that exhibit a high degree of layout regularity.

关键词： Adders Integrated circuit interconnections Routing Wiring Digital arithmetic computer science LAN interconnection Delay Time division multiplexing Logic

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