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ACM Special Interest Group on computer graphics and Interactive Techniques Conference, SIGGRAPH 2013

作者： Eisemann, Elmar Assarsson, Ulf Schwarz, Michael Valient, Michal Wimmer, Michael Delft University of Technology Netherlands Department of Computer Science and Engineering Chalmers University Sweden Guerrilla Games / Sony Computer Entertainment Netherlands Institute of Computer Graphics and Algorithms Vienna University of Technology Austria

ISBN: (纸本)9781450323390

This course provides an overview of efficient, real-time shadow algorithms. It presents the theoretical background but also discusses implementation details for facilitating efficient realizations (hard and soft shadows, volumetric shadows, reconstruction techniques). These elements are of relevance to both experts and practitioners. The course also reviews budget considerations and analyzes performance trade-offs, using examples from various AAA game titles and film previsualization tools. While physical accuracy can sometimes be replaced by plausible shadows, especially for games, film production requires more pecision, such as scalable solutions that can deal with highly detailed *** course builds upon earlier SIGGRAPH courses as well as the recent book Real-Time Shadows (A K Peters, 2011) by four of the instructors (due to its success, a second edition is planned for 2014). And with two instructors who have worked on AAA game and movie titles, the course presents interesting behindthe-scenes information that illuminates key topics.

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ECC Implementation for Secured RFID Communication

ECC Implementation for Secured RFID Communication

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2nd International Multi-Conference on computer, Electrical, Electronics and Mechanical Engineering (IMCEEME’14);2nd International Journal Multi-Conference on Agriculture, Ecological and Medical sciences (IJMAEMS’14)

作者： Monika Sharma P.C.Agrawal Mewar University (Chittorgarh) Raj. Department of Computer Science & System Studies Asst.Professor Amity Institute of Information Technology Amity University Secor-125NoidaU.P. INDIA

To protect RFID privacy violation against various attacks(like eavesdropping, location tracking, spoofing, message loss or replay attack etc.) some of the encryption schemes were proposed by researchers to provide secure communication such as blocker-tag, hash lock scheme, randomized hash lock, hash chain, variable ID, reencryption, RSA etc. However applying this public key encryption approach requires higher implementation effort in chip size, low performance and high power consumption. A good RFID tag is one which is cheap(small area), scalable, securable, untraceable(PKC) and fast(light weight). As ECC is based on multiplication technique so it is comparatively faster, cheap and complex than other techniques. So in this paper we will approach this technique in such a way that both tag as well as reader authenticates while accessing the information through server and data can be protected from eavesdropping.

关键词： Elliptic curve cryptography(ECC),privacy,Radio Frequency Identification(RFID) and security.

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A method for identifying image data coming from two optical channels in a split field of view star camera

A method for identifying image data coming from two optical ...

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IEEE Metrology for Aerospace

作者： Dong Cao Ze Chen Xiaofeng Wang Shaobo Gao Jichun Tan Yunjin Chen Department of Optoelectronic Engineering Jinan University JNU Changsha P. R. China College of Science National University of Defense Technology NUDT Changsha P. R. China Institute of Computer Graphics and Vision Graz University of Technology TU Graz Graz Austria

Split FOV (Field of View) star tracker was developed by Texas A&M University together with the University of Rome “La Sapienza”. A 50% splitter was used to combine light beams from two separate FOVs, while only a single objective lens and optical detector are used. In this way, double FOV configuration allows increased accuracy in attitude determination by taking advantage of the ability to examine two orthogonal FOVs simultaneously. There is a demand for optical tag due to each frame contained overlapping star images coming from separate FOVs. In this paper we propose a method for identifying two FOVs by tagging the images with different shaped diffraction patterns. We insert a circular diaphragm in the optical channel 1 # and non-circular (elliptical or rectangular) in the channel 2 # , so that images with distinctive features are produced at CCD photosensitive surface - circular Airy disc for the FOV-1 # and elliptical contour (with side lobe or distortion) for FOV-2 # . The effects of elliptical sampling window and the signal-to-noise ratio on the accuracy of the centroid estimate for star spots with a Gaussian intensity distribution were discussed theoretically. The optical tagging has one limitation. There is possibility for a star image tagged by non-circular contour, which is confused with smearing trail due to high angular velocity operation (e.g. greater than 1°/s).

关键词： Apertures Optical diffraction Optical imaging Noise Cameras Optical sensors Lenses

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Using a serious game approach to teach 'operator precedence' to introductory programming students

Using a serious game approach to teach 'operator precedence'...

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2013 17th International Conference on Information Visualisation, IV 2013

作者： Adamo-Villani, Nicoletta Haley-Hermiz, Thomas Cutler, Robb Department of Computer Graphics Technology Purdue University West Lafayette IN United States Department of Computer Science Purdue University West Lafayette IN United States

ISBN: (纸本)9780769550497

In this paper we describe the design, development, formative evaluation and initial findings of one level of a serious game whose objective is to teach Information Assurance concepts to undergraduate students in introductory programming courses. The game level focuses on the concept of 'operator precedence'. The player travels through a multilevel 3- dimensional maze and at each junction in the maze he/she is required to solve a mathematical problem that involves the application of operator precedence rules. A correct answer allows the player to move closer to the maze exit, an incorrect solution moves the player farther from the end of the maze. Initial findings from a formative study with a group of 14 undergraduate students show that the game level is usable, engaging and useful for learning/reviewing the intended programming concept. © 2013 IEEE.

关键词： Serious games

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Accepting the ASIS&T 2015 Award of Merit

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Bulletin of the Association for Information science and technology 2016年第2期42卷

作者： Michael E. D. Koenig recipient of the 2015 ASIS&T Award of Merit Koenig has worked extensively both in academia and in the private sector providing an example of a member who has successfully contributed in both areas. He has published over 100 professional publications even though he has not been a career professor instead he has spent more than 2/3 of his 40-year career as a fulltime executive. His research areas have benefited from that combined experience and provide compelling research within knowledge management especially on the positive impact of information services on research productivity. He was also the creator and founding dean of one of the first iSchools – the College of Information and Computer Science at Long Island University (2001). He is the author of a record four chapters in the Annual Review of Information Science and Technology (ARIST) co-editor of three ASIS&T monographs (on the subject of knowledge management) and a past president of the International Society for Scientometrics and Informetrics.

EDITOR'S SUMMARY In receiving the ASIS&T Award of Merit for 2015, Michael E. D. Koenig recognized his many collaborators, mentors and those who have stimulated his thinking on numerous topics in information science. Koenig reflected on his wide-ranging past studies, weaving through bibliometrics, information systems, library automation and education for library and information science. Koenig adapted citation analysis to develop a metric for pharmaceutical R&D demonstrating that citation data is a valid measure of research impact, and he has written extensively on the connection between an organization's information services and its productivity. In Koenig's view, knowledge management is the effort to build an information environment within an organization that supports its research effectiveness; it is a key contributor to organizational impact. Koenig hopes to see knowledge management, rooted in a strong information environment, serve as a catalyst for impact.

关键词： honors scholars information science history knowledge management organizational culture organization productivity information impact

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Diverse trajectory planning for UAV control displays

Diverse trajectory planning for UAV control displays

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12th International Conference on Autonomous Agents and Multiagent Systems 2013, AAMAS 2013

作者： Tožička, Jan Balata, Jan Míkovec, Zdeněk Agent Technology Center Dept. of Computer Science Prague Czech Republic Department of Computer Graphics and Interaction FEE Czech Technical University Prague Czech Republic

ISBN: (纸本)9781627487665

Current UAV control systems can plan optimal trajectories with respect to predefined constraints (waypoints, no-fly zones). However when the operator is not satisfied with planned trajectories it is usually very complicated to force the system to change the trajectories in desired way. In this demonstration we solve this problem by innovative UAV control display based on diverse planning algorithm. Copyright © 2013, International Foundation for Autonomous Agents and Multiagent Systems (***). All rights reserved.

关键词： Unmanned aerial vehicles (UAV)

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GPU-ASIFT: A fast fully affine-invariant feature extraction algorithm

GPU-ASIFT: A fast fully affine-invariant feature extraction ...

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2013 11th International Conference on High Performance Computing and Simulation, HPCS 2013

作者： Codreanu, Valeriu Dong, Feng Liu, Baoquan Roerdink, Jos B.T.M. Williams, David Yang, Po Yasar, Burhan Scientific Visualization and Computer Graphics Rijksuniversiteit Groningen Groningen Netherlands Department of Computer Science and Technology University of Bedfordshire Bedfordshire United Kingdom Rotasoft Inc United Kingdom

ISBN: (纸本)9781479908363

This paper presents a method that takes advantage of powerful graphics hardware to obtain fully affine-invariant image feature detection and matching. The chosen approach is the accurate, but also very computationally expensive, ASIFT algorithm. We have created a CUDA version of this algorithm that is up to 70 times faster than the original implementation, while keeping the algorithm's accuracy close to that of ASIFT. It's matching performance is therefore much better than that of other non-fully affine-invariant algorithms. Also, this approach was adapted to fit the multi-GPU paradigm in order to assess the acceleration potential from modern GPU clusters. © 2013 IEEE.

关键词： computer vision

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Investigation of Mechanical Properties, Microstructure and Wear Rate of High Leaded Tin Bronze after Multidirectional Forging

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Procedia Materials science 2014年 5卷 1081-1089页

作者： Rahul Gupta Sanjay Srivastava G.V. Preetham Kumar Sanjay K. Panthi Ph.D Research Scholar Department of Material Science & Metallurgical Engineering Maulana Azad National Institute of Technology Bhopal 462003 India Associate Professor Department of Material Science & Metallurgical Engineering Maulana Azad National Institute of Technology Bhopal 462003 India Assistant Professor Department of Metallurgical & Materials Engineering National Institute of Technology Karnataka Surathkal Mangalore 575025 India Scientist Computer Simulation & Design Center Advanced Materials and Processes Research Institute (AMPRI) Near Habibganj Naka Hoshangabad Road Bhopal 462064 India

In this work, the change in mechanical properties, microstructure and wear rate of high leaded tin bronze material was studied after multidirectional forging (MDF) process. The total equivalent strain of 0.75 was applied during MDF process result in the improvement of ultimate tensile strength, yield strength, hardness and wear rate along with maintained ductility with the increase in the number of MDF pass. The initial average grain size of 120 nm was refined to the final grain size of 37 nm. The transmission electron microscope, scanning electron microscope and optical microscope was used for the microstructure study of the undeformed, MDForged and wear worn surfaces.

关键词： Multidirectional forging high leaded tin bronze mechanical properties microstructure wear

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Abstracts and Workshops 7th National Spinal Cord Injury Conference November 9-11, 2017 Fallsview Casino Resort Niagara Falls, Ontario, Canada Abstracts

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JOURNAL OF SPINAL CORD MEDICINE 2017年第6期40卷 813-869页

作者： [Anonymous] a NET Team Toronto Rehabilitation Institute - University Health Network Toronto ON Canada. fo Neural Engineering and Therapeutic Team Lyndhurst Centre Toronto Rehabilitation Institute - University Health Network Toronto ON Canada. c Rick Hansen Institute Vancouver BC Canada. ev Rick Hansen Institute Vancouver BC Canada. fc Stan Cassidy Hospital University of New Brunswick Fredericton NB Canada. fd Dalhousie University Halifax NS Canada. e University of Saskatchewan Saskatoon SK Canada. aa University of Calgary Calgary AB Canada. y Dalhousie University Halifax NS Canada. fa Health Sciences Centre Winnipeg MB Canada. fb University of Manitoba Winnipeg MB Canada. h University of Alberta Edmonton AB Canada. i Universite Laval Quebe c City QC Canada. bd Rick Hansen Institute Vancouver BC Canada. fz Clinician Investigator Lyndhurst Centre Toronto Rehabilitation Institute University Health Network and Assistant Professor Department of Medicine Division of Physical Medicine and Rehabilitation University of Toronto. v University of Toront o Toronto ON Canada. n Institute of Biomaterials and Biomedical Engineering University of Toronto Toronto ON Canada. o Toronto Rehabilitation Institute - University Health Network Toronto ON Canada. ga Clinical Scientist Lyndhurst Centre Toronto Rehabilitation Institute University Health Network and Assistant Professor Department of Physical Therapy University of Toronto. dx Department of Electrical and Computer Engineering University of Toronto Toronto ON Canada. fm Lawson Health Research Institute London ON Canada. r Parkwood Institute London ON Canada. bi Parkwood Institute London ON Canada. s University of British Columbia Vancouver BC Canada. t Simon Fraser University Burnaby BC Canada. u DeltaQuest Foundation Concord MA USA. z Institut national d'excellence en santé et en services sociaux (INESSS) Quebec City QC Ca

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Improving the visualization of electron-microscopy data through optical flow interpolation

Improving the visualization of electron-microscopy data thro...

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27th Spring Conference on computer graphics, SCCG 2011

作者： Carata, Lucian Shao, Dan Hadwiger, Markus Groeller, Eduard Faculty of Automatic Control and Computer Engineering Gh. Asachi Technical University of Iasi Romania Institute of Computer Graphics and Algorithms Vienna University of Technology Austria Division of Mathematical and Computer Sciences and Engineering King Abdullah University of Science and Technology Saudi Arabia

ISBN: (纸本)9781450319782

Technical developments in neurobiology have reached a point where the acquisition of high resolution images representing individual neurons and synapses becomes possible. For this, the brain tissue samples are sliced using a diamond knife and imaged with electron-microscopy (EM). However, the technique achieves a low resolution in the cutting direction, due to limitations of the mechanical process, making a direct visualization of a dataset difficult. We aim to increase the depth resolution of the volume by adding new image slices interpolated from the existing ones, without requiring modifications to the EM image-capturing method. As classical interpolation methods do not provide satisfactory results on this type of data, the current paper proposes a re-framing of the problem in terms of motion volumes, considering the depth axis as a temporal axis. An optical flow method is adapted to estimate the motion vectors of pixels in the EM images, and this information is used to compute and insert multiple new images at certain depths in the volume. We evaluate the visualization results in comparison with interpolation methods currently used on EM data, transforming the highly anisotropic original dataset into a dataset with a larger depth resolution. The interpolation based on optical flow better reveals neurite structures with realistic undistorted shapes, and helps to easier map neuronal connections. © 2011 ACM.

关键词： Interpolation

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