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检索条件"任意字段=Conference on Current Developments in Optical Design and Engineering V"

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Enhance current density and light trapping effect in a-Si thin film solar cells by flexible textured PDMS film

Enhance current density and light trapping effect in a-Si th...

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IEEE International Nanoelectronics conference (INEC)

作者： H. v. Han H. C. Chen Y. L. Tsai C. C. Lin H. C. Kuo P. Yu Department of Photonics and Institute of Electro-Optical Engineering National Chiao Tung University Hsinchu Taiwan Institute of Photonic Systems National Chiao Tung University Tainan Taiwan

The light trapping effect of a textured polydimethylsiloxane (PDMS) film on the suppression of surface reflection in a-Si:H solar cell is investigated. The angular dependence of scattered light from this PDMS film was measured and a symmetric scattering intensity peak was found at +/- 20°. The enhancement of power conversion efficiency in the a-Si:H solar cell with textured PDMS film can reach 16.37% compared to the a-Si:H solar cells without textured PDMS film. This improvement is mainly attributed to the enhanced efficiencies of light trapping and scattering. Such a design concept and fabrication process can be widely adapted to a variety of thin film solar cells.

关键词： Nanoelectronics conferences

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design and implementation of multi-layer and multi-bit micro holographic optical data storage employing blue lasers

Design and implementation of multi-layer and multi-bit micro...

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conference on current developments in Lens design and optical engineering XIII

作者： Takashima, Yuzuru Hesselink, Lambertus Univ Arizona Coll Opt Sci Tucson AZ 85721 USA

ISBN: (纸本)9780819492036

A zoom objective lens for a multi-layer optical recording has been designed. A newly proposed optical power arrangement enables varying back focal length while focal length invariant by a linear movement of single zooming component. The zoom lens is implemented into multi-layer and multi-bit holographic recording system employing 405 nm blue lasers.

关键词： Objectives optical design Holography Aspheric lenses Lens design optical storage Zoom lenses Distance measurement optical components optical recording

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Control Measurement System for Railway Track Position

Control Measurement System for Railway Track Position

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conference on current developments in Lens design and optical engineering XIII

作者： Pantiushin, A. Korotaev, v Univ Informat Technol Dep OEPS Natl Res St Petersburg Russia

ISBN: (纸本)9780819492036

The control of the railway track relative to the fixed system of reference is a necessary condition to ensure the safety of railway traffic. This paper describes the optical-electronic system of railway track control relative to the fixed system of reference. The system consists of two cameras and special marks. The system is installed on the leveling machine and performs measurements during its motion. System marks are installed on the contact-line supports. This paper presents the test results. The system determines the distance to the mark with an accuracy of 1.5 mm in the range of 1.5-7 mm and the vertical bias with an accuracy of 1.5 mm in the range of 200 mm. This paper describes the algorithms of the system, and special attention is paid to sources of error in such systems.

关键词： Railway track measuring position three-dimensional system

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Towards Effective Event-Driven SOA in Enterprise Systems

Towards Effective Event-Driven SOA in Enterprise Systems

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IEEE International conference on Systems, Man, and Cybernetics

作者： Quirino Zagarese Angelo Furno Gerardo Canfora Eugenio Zimeo Department of Engineering University of Sannio Benevento ITALY

ISBN: (纸本)9781479906505

Event-driven programming is progressively replacing the call-stack model to improve flexibility, efficiency and scalability in SOA. Enterprise applications often deal with large messages attached to asynchronous events. This could reduce the benefits provided by event-driven programming since the need for having every information propagated as event is counterbalanced by wasting resources when large messages are entirely propagated to destinations that do not use all of them. In this paper, we propose the adoption of the D-WSLink framework for improving data transfers by using a composite and extensible declarative mechanism to inject the desired message transfer strategies into the underlying middleware. At the current stage, we focus mainly on (conditional) lazy transfer mechanisms even though the framework is able to support also smarter strategies. In particular, we compare, through an experimental analysis, our system with Apache Camel in delivering events with large attachments. The results show that the proposed approach is effective not only for programming but also at performance level.

关键词： SOA EDA Enterprise Systems Data-Intensive Publish-Subscribe Service-oriented architecture Semiconductor optical Amplifier Publish-subscribe event-driven programming European Defence Agency electronic design automation Electronic design automation and methodology EDA gene Programming even-driven program Level of Performance

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Incentive Mechanism for Collaborative Smartphone Sensing using Overlapping Coalition Formation Games

Incentive Mechanism for Collaborative Smartphone Sensing usi...

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IEEE Global Communications conference

作者： Boya Di Tianyu Wang Lingyang Song Zhu Han State Key Laboratory of Advanced Optical Communication Systems and Networks School of Electrical Engineering and Computer Science Peking University Electrical and Computer Engineering Department University of Houston

ISBN: (纸本)9781479913510

With the rapid growth of sensor technology, smart-phone sensing has become an effective approach to help improve the quality of applications in smartphones. However, the quality and quantity of the sensed data uploaded by the users are not always satisfying due to the lack of incentives for users to participate. In this paper, we design an incentive mechanism in which the users can get satisfying rewards from the platform by efficiently allocating their resources, and meanwhile, the platform can achieve a relatively high social welfare. Specifically, to solve the resource allocation problem in the incentive mechanism, we consider a cooperative game model with overlapping coalitions, in which the smartphone users can self-organize into the over-lapping coalitions for different sensing tasks. Then, we propose a distributed algorithm that converges to a stable outcome in which no user has the motivation to change its current resource allocation so as to increase its individual payoff unilaterally. Simulation results show that the proposed scheme achieves a better performance than the average distribution case and the single-task distribution case in various conditions.

关键词： Smartphone Consumers incentives Resource utilization Game theory distributed algorithms Interest groups

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design and fabrication of imaging optical systems with freeform surfaces

Design and fabrication of imaging optical systems with freef...

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conference on current developments in Lens design and optical engineering XIII

作者： Zhang Xin Zheng Ligong He Xin Wang Lingjie Zhang Feng Yu Shuqin Shi Guangwei Zhang Binzhi Liu Qiang Wang Tongtong Changchun Inst Opt Key Lab Opt Syst Adv Mfg Technol Changchun 130033 Peoples R China

ISBN: (纸本)9780819492036

Freeform surfaces provide more degrees of freedom for design of optical systems, and enhance the ability of compensation and correction aberrations. Freeform surfaces are of advantage to balance the unsymmetrical aberrations, especially for the wide-field off-axis optical systems. This paper focus on an off-axis reflective optical system, which focal length is 550mm, F# is 6.5 and field of view (FOv) is 76 degrees. The system adopts some freeform surfaces. We discuss the problems we noticed in processes of design, manufacture, measurement and alignment, and the solutions. At last, the periodical research result and the expected performance are given.

关键词： Freeform surfaces aberrations correction off-axis reflective optical system wide FOv

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Novel global optimization algorithms: binary construction and the saddle-point method

Novel global optimization algorithms: binary construction an...

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conference on current developments in Lens design and optical engineering XIII

作者： Dilworth, Donald C. Optical Systems Design Inc. (United States)

ISBN: (纸本)9780819492036

This paper describes our experience with global lens optimization using algorithms that can modify an existing lens construction in an optimal way or create an entirely new construction. The binary-search method assembles lens elements according to the bits in a binary number, ensuring that all combinations of power are tested, while the saddle-point method can either add elements to a starting lens or start from scratch. The latter algorithm also naturally leads to a method of removing an element in an optimum way, which can sometimes simplify a lens with no loss of quality.

关键词： Global optimization lens design saddle-point lens optimization PSD algorithm

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Finding starting points analytically for optical system optimization

Finding starting points analytically for optical system opti...

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conference on current developments in Lens design and optical engineering XIII

作者： Bociort, F. van Grol, P. Delft Univ Technol Opt Res Grp NL-2628 CJ Delft Netherlands

ISBN: (纸本)9780819492036

Understanding the structure of the design space in optical system optimization is difficult, because common human intuition fails when it encounters the challenge of high dimensionality, resulting from the many optimization parameters of lens systems. However, a deep mathematical idea, that critical points structure the properties of the space around them, is fruitful in lens design as well. Here we discuss simple systems, triplets with curvatures as variables, for which the design space is still simple enough to be studied in detail, but complex enough to be non-trivial. A one-to-one correspondence between the possible design shapes and the critical points resulting from a simplified model based on third-order spherical aberration within the framework of thin-lens theory could lead in the future to a new way to determine good starting points for subsequent local optimization.

关键词： saddle point critical point global optimization optical system design

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Analytic free-form lens design for imaging applications with high aspect ratio

Analytic free-form lens design for imaging applications with...

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conference on current developments in Lens design and optical engineering XIII

作者： Duerr, Fabian Benitez, Pablo Minano, Juan Carlos Meuret, Youri Thienpont, Hugo Vrije Univ Brussel Fac Engn Sci Brussels Photon Team B PHOT TONA FirW B-1050 Brussels Belgium

ISBN: (纸本)9780819492036

A new three-dimensional analytic optics design method is presented that enables the coupling of three ray sets with only two free-form lens surfaces. Closely related to the Simultaneous Multiple Surface method in three dimensions (SMS3D), it is derived directly from Fermat's principle, leading to multiple sets of functional differential equations. The general solution of these equations makes it possible to calculate more than 80 coefficients for each implicit surface function. Ray tracing simulations of these free-form lenses demonstrate superior imaging performance for applications with high aspect ratio, compared to conventional rotational symmetric systems.

关键词： Mathematical methods in physics geometric optical design and lens design free-form optics

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Graphically selecting optical components and housing material for color correction and passive athermalization

Graphically selecting optical components and housing materia...

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conference on current developments in Lens design and optical engineering XIII

作者： Schwertz, Katie Dillon, Dan Sparrold, Scott Edmund Opt Tucson AZ USA

ISBN: (纸本)9780819492036

This paper will demonstrate a graphical method for selecting a pair of optical components to simultaneously achromatize and passively athermalize an imaging lens for use in a housing with a particular coefficient of thermal expansion. The effort will be presented for a generic spectrum, so readers may apply the method to whatever waveband and set of materials that are of interest. The term "component" is used in place of "material" since this paper will explore combinations of refractive and diffractive optics. The method for creating an achromat with two refractive materials will be reviewed. To create an athermal doublet, or lens that does not change focus under temperature changes, the same color equations are used with a slight modification to include housing thermal effects. The paper will culminate by demonstrating how a set of two materials can be used to both color correct and passively athermalize a single lens;these materials can be quickly chosen to match a particular housing material via nomograph. A sample chart for a common waveband will be demonstrated.

关键词： lens design optical design passively athermal thermal defocus achromatic graphic solution

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