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Linear diffraction grating interferometer with high alignment tolerance and high accuracy

APPLIED OPTICS 2011年第22期50卷 4550-4556页

作者： Cheng, Fang Fan, Kuang-Chao Hefei Univ Technol Sch Instrument Sci & Optoelect Engn Hefei 230009 Anhui Peoples R China Nanyang Technol Univ Sch Mech & Aerosp Engn Singapore 639798 Singapore Natl Taiwan Univ Dept Mech Engn Taipei 10617 Taiwan

We present an innovative structure of a linear diffraction grating interferometer as a long stroke and nanometer resolution displacement sensor for any linear stage. The principle of this diffractive interferometer is based on the phase information encoded by the +/- 1st order beams diffracted by a holographic grating. Properly interfering these two beams leads to modulation similar to a Doppler frequency shift that can be translated to displacement measurements via phase decoding. A self-compensation structure is developed to improve the alignment tolerance. LightTool analysis shows that this new structure is completely immune to alignment errors of offset, standoff, yaw, and roll. The tolerance of the pitch is also acceptable for most installation conditions. In order to compact the structure and improve the signal quality, a new optical bonding technology by mechanical fixture is presented so that the miniature optics can be permanently bonded together without an air gap in between. For the output waveform signals, a software module is developed for fast real-time pulse counting and phase subdivision. A laser interferometer HP5529A is employed to test the repeatability of the whole system. Experimental data show that within 15 mm travel length, the repeatability is within 15 nm. (c) 2011 Optical Society of America

关键词： interferometers Diffraction gratings Doppler frequency Signal quality software module Repeatability alignment error Linear AIR GAP Phase DISPLACEMENT MEASUREMENT

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Method for estimating the surface roughness of relief-phase holographic optical elements and its effect on their imaging properties

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JOURNAL OF OPTICAL TECHNOLOGY 2011年第3期78卷 174-175页

作者： Koreshev, S. N. Atlygina, Yu. V. St Petersburg State Univ Informat Technol Mech & St Petersburg Russia

This paper describes a method for determining the short-wavelength usage limit of relief-phase holographic optical elements (HOEs), caused by their surface roughness. It essentially consists of using data obtained from an atomic-force microscope to determine the shape of the relief profile of an HOE, averaged over the base area, i.e., the scanning area;using this as a basis for determining its rms surface roughness, averaged over the same base area;and then calculating the limiting wavelength in which the HOE can be used. A software module has been developed for implementing this method. (C) 2011 Optical Society of America.

关键词： deformed section scanning area software module Holographic optical components base area Surface roughness

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A Data Processing Pipeline for Mammalian Proteome Dynamics Studies Using Stable Isotope Metabolic Labeling

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MOLECULAR & CELLULAR PROTEOMICS 2011年第12期10卷 0728-0728页

作者： Guan, Shenheng Price, John C. Prusiner, Stanley B. Ghaemmaghami, Sina Burlingame, Alma L. Univ Calif San Francisco Mass Spectrometry Facil San Francisco CA 94158 USA Univ Calif San Francisco Dept Pharmaceut Chem San Francisco CA 94158 USA Univ Calif San Francisco Inst Neurodegenerat Dis San Francisco CA 94143 USA Univ Calif San Francisco Dept Neurol San Francisco CA 94143 USA

In a recent study, in vivo metabolic labeling using N-15 traced the rate of label incorporation among more than 1700 proteins simultaneously and enabled the determination of individual protein turnover rate constants over a dynamic range of three orders of magnitude (Price, J. C., Guan, S., Burlingame, A., Prusiner, S. B., and Ghaemmaghami, S. (2010) Analysis of proteome dynamics in the mouse brain. Proc. Natl. Acad. Sci. U. S. A. 107, 1450814513). These studies of protein dynamics provide a deeper understanding of healthy development and wellbeing of complex organisms, as well as the possible causes and progression of disease. In addition to a fully labeled food source and appropriate mass spectrometry platform, an essential and enabling component of such large scale investigations is a robust data processing and analysis pipeline, which is capable of the reduction of large sets of liquid chromatography tandem MS raw data files into the desired protein turnover rate constants. The data processing pipeline described in this contribution is comprised of a suite of software modules required for the workflow that fulfills such requirements. This software platform includes established software tools such as a mass spectrometry database search engine together with several additional, novel data processing modules specifically developed for N-15 metabolic labeling. These fulfill the following functions: (1) cross-extraction of N-15-containing ion intensities from raw data files at varying biosynthetic incorporation times, (2) computation of peptide N-15 isotopic incorporation distributions, and (3) aggregation of relative isotope abundance curves for multiple peptides into single protein curves. In addition, processing parameter optimization and noise reduction procedures were found to be necessary in the processing modules in order to reduce propagation of errors in the long chain of the processing steps of the entire workflow. Molecular & Cellular Proteomics 10: 10.1074

关键词： Sulfur Protein Turnover pipeline Protein Metabolism Process Proteomes Data Files data processing software module

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SMALL AIRCRAFT FLIGHT SAFETY INCREASING USING INTEGRATED MODULAR AVIONICS

SMALL AIRCRAFT FLIGHT SAFETY INCREASING USING INTEGRATED MOD...

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IEEE/AIAA Digital Avionics Systems Conference

作者： Tomas Levora Ondrej Bruna Pavel Paces Czech Technical University in Prague

ISBN: (纸本)9781467316996

This paper describes an idea of one approach to small aircraft safety increasing. The project was founded as reaction on numbers of small simple-engine aircraft accidents in the Czech Republic and their usual reason - human factor. Pilots and schools in the Czech Republic recently started to use glass cockpits which can be used also in other way than pure EFIS. Glass cockpit system could be extended by appropriate safety software modules. software modules can be used in critical situations for flight analysis and giving appropriate advices to the pilot. Under this project was developed simple module navigating pilot to landing site when engine fails. Paper describes first version of EFIS with mentioned modules and also summarizes idea of designing system including testing approaches.

关键词： Czech Republic Pilots design system flight safety flight strip software module Aircraft Modularity European Forest Institute paper International Data Encryption Algorithm Engines

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software module hones system-wide practices

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OIL & GAS JOURNAL 2006年第37期104卷 56-+页

作者： van Os, Menno Gasunie Engineering and Technology N.V. Nederlandse Gasunie Groningen Netherlands

Gasunie has utilized external corrosion direct assessment (ECDA) as proposed by the National Associa-tion of Corrosion Engineers (NACE) as a valuable method of assessing the corrosion threat in unpiggable pipelines.

关键词： software module Hones Corrosion

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Model Development, Testing and Experimentation in a CyberWorkstation for Brain-Machine Interface Research

Model Development, Testing and Experimentation in a CyberWor...

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32nd Annual International Conference of the IEEE Engineering-in-Medicine-and-Biology-Society (EMBC 10)

作者： Rattanatamrong, Prapaporn Matsunaga, Andrea Raiturkar, Pooja Mesa, Diego Zhao, Ming Mahmoudi, Babak DiGiovanna, Jack Principe, Jose Figueiredo, Renato Sanchez, Justin Fortes, Jose Univ Florida Gainesville FL 32610 USA Florida Int Univ Miami FL 33199 USA ETHZ Zurich Switzerland

ISBN: (纸本)9781424441242

The CyberWorkstation (CW) is an advanced cyber-infrastructure for Brain-Machine Interface (BMI) research. It allows the development, configuration and execution of BMI computational models using high-performance computing resources. The CW's concept is implemented using a software structure in which an "experiment engine" is used to coordinate all software modules needed to capture, communicate and process brain signals and motor-control commands. A generic BMI-model template, which specifies a common interface to the CW's experiment engine, and a common communication protocol enable easy addition, removal or replacement of models without disrupting system operation. This paper reviews the essential components of the CW and shows how templates can facilitate the processes of BMI model development, testing and incorporation into the CW. It also discusses the ongoing work towards making this process infrastructure independent.

关键词： biomedical communication brain communication brain signal processing brain-computer interfaces brain-machine interface computer communications software cyberworkstation data acquisition data acquisition human computer interaction medical signal processing motor-control commands neurophysiology software module

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Adaptive Hardware-software Co-Design Platform for Fast Prototyping of Embedded Systems

Adaptive Hardware-Software Co-Design Platform for Fast Proto...

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12th International Conference on Optimization of Electrical and Electronic Equipment

作者： Oniga, Stefan Tisan, Alin Lung, Claudiu Buchman, Attila Orha, Ioan North Univ Dept Elect & Comp Engn Baia Mare Romania

ISBN: (纸本)9781424470198

This paper presents the hardware-software co-design platform based on FPGA developed for fast prototyping of embedded systems using hardware modules that can be easily connected and "driver" modules that can manage I/O devices and sensors basic behavior. Having this framework, adding of a new I/O peripheral needs only design and synthesis of an application specific VHDL or software module. Using neural networks (NN) to add learning capabilities and adaptive behavior is essential for an intelligent system and the use of FPGA is an important feature in terms of their hardware implementation. The designed architecture allows the insertion of intelligent interface based on neural networks created with this type of modules. This platform is based on low cost general purpose FPGA boards without need for hardware design.

关键词： Embedded systems Field programmable gate arrays Co-design intelligent interfaces hardware module Platform software module computer hardware design Intelligent systems PROTOTYPE Neural network IO Adaptive Behavior

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Realizing Autonomous Valet Parking with Automotive Grade Sensors

Realizing Autonomous Valet Parking with Automotive Grade Sen...

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IEEE/RSJ International Conference on Intelligent Robots and Systems

作者： Jeevan, Prasanth Harchut, Frank Mueller-Bessler, Bernhard Huhnke, Burkhard Volkswagen Grp Amer Elect Res Lab 4005 Miranda AveSuite 100 Palo Alto CA 94304 USA Volkswagen AG Grp Res D-38436 Wolfsburg Germany

ISBN: (纸本)9781424466757

The availability of several Advanced Driver Assistance Systems has put a correspondingly large number of inexpensive, yet capable sensors on production vehicles. By combining this reality with expertise from the DARPA Grand and Urban Challenges in building autonomous driving platforms, we were able to design and develop an Autonomous Valet Parking (AVP) system on a 2006 Volkwagen Passat Wagon TDI using automotive grade sensors. AVP provides the driver with both convenience and safety benefits - the driver can leave the vehicle at the entrance of a parking garage, allowing the vehicle to navigate the structure, find a spot, and park itself. By leveraging existing software modules from the DARPA Urban Challenge, our efforts focused on developing a parking spot detector, a localization system that did not use GPS, and a back-in parking planner. This paper focuses on describing the design and development of the last two modules.

关键词： advanced driver assistance system automated highways automotive grade sensor autonomous valet parking back in parking planner intelligent sensors software module traffic control

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Concurrent Composition Using Loci

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COMPUTING IN SCIENCE & ENGINEERING 2009年第3期11卷 27-35页

作者： Zhang, Yang Luke, Edward Mississippi State Univ Computat Simulat & Design Ctr Mississippi State MS 39762 USA Mississippi State Univ Dept Comp Sci & Engn Mississippi State MS USA

A new software framework called Loci provides an automatic system for generating the communication and synchronization required to correctly compose software modules. This results in a much cleaner software architectu... 详细信息

关键词： software Frameworks software architecture Cleaners automation system software module

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Measuring the evolutionary stability of software systems: case studies of Linux and FreeBSD

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IET software 2009年第1期3卷 26-36页

作者： Yu, L. Ramaswamy, S. Indiana Univ S Bend Dept Comp & Informat Sci South Bend IN 46634 USA Univ Arkansas Dept Comp Sci Little Rock AR 72204 USA

In software evolution, stability is defined as the ability of a module to remain largely unchanged when faced with newer requirements and/or changes in the environment. Although stability is an important long-term design characteristic for hardware systems, it has not been studied deeply for software systems. Stability is directly related to software evolvability and maintainability;and it affects the software evolution process. A model based on software version differences is presented to measure the evolutionary stability of software modules. This model represents and normalises two distances: the source code and the structure distances, between two versions of an evolving software module. As a case study based on this model, the evolutionary stability of Linux and FreeBSD modules is compared. The results of the study shows that the evolutionary stability of a software module in Linux and FreeBSD depends more on its function type and less on the system environment.

关键词： Linux Hardware system Evolutionary Maintainability software systems Unix operating system software module software evolution Source code

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