Omar U. Florez

achievements

2010-04-06T19:58:14-04:00

* Travel Grant from the USU Graduate Student Senate ($300) to attend to present a paper at the 11th ACM International Conference on Multimedia Information Retrieval (MIR) in April 2010. * Travel Grant from the USU Graduate Student Senate ($300) and ACM SAC ($500) to attend to present a paper at the 24th Annual ACM Symposium on Applied Computing, $800 received in December 2008.

concurrenthashtable

2009-12-06T14:56:16-04:00

A PATTERN FOR MULTITHREADING HASH TABLES OMAR U. FLOREZ ---------- ABSTRACT Data structures are used to organize data so that it can be used efficiently. Some examples of data structures include hash tables, queues, and vectors.. However, the use of these structures in multithreading environments exhibits commonly occurring problems not explained by the Gamma’s book. Synchronization of threads and memory consistency errors are two of the most reoccurring problems related to the concurrent …

contact

2008-03-09T15:09:20-04:00

[Row 1 Col 2] Brief description of projects and results…

cseducation

2009-08-06T11:37:10-04:00

* Criteria for accrediting Computing Programs in ABET * Careers in Computer Science and Computer Engineering (IEEE) * Curricula Recommendations (ACM) * Computing Careers (ACM) * Computing Disciplines & Majors (ACM) * Computing Curricula 2005 (ACM) * Model curriculum for graduate programs in Information Systems (ACM & AIS) * Master of Science in Information Systems (MSIS) model curriculum (ACM)

default_sidebar

2010-04-21T05:09:29-04:00

MAIN * - Home page * - Curriculum Vitae (PDF) * - Contact information ACADEMICS * + Publications * + RESEARCH PROJECTS * + Tutorials * - Achievements * - My Personal Blog (*) BUSINESS * - Fair use of computer for disable people NEWS AND EVENTS * - Events

demos

2009-08-10T16:36:21-04:00

a Time Series Search System [here] b Tracking of people using cellphones [here] c Mobile browsing with cellphones [here]

ethical_code

2009-01-16T18:40:58-04:00

Rigour, respect and responsibility: a universal ethical code for scientists Rigour, honesty and integrity * Act with skill and care in all scientific work. Maintain up to date skills and assist their development in others * Take steps to prevent corrupt practices and professional misconduct. Declare conflicts of interest * Be alert to the ways in which research derives from and affects the work of other people, and respect the rights and reputations of others

fingerprint-retrieval

2009-07-11T22:31:44-04:00

Scalable Fingerprint Recognition. Since large databases of fingerprint images are been available nowadays, searching methods on these databases are requiered. Indexation is actually the most common method to organize objects in databases, but this method is normally restricted to exact comparisons of index objects (e.g., numbers, strings). However, if there is a distance function that can be defined in a set of objects, we can organize them in a Metric Space. In this project we organize fin…

futureprojects

2008-03-20T02:00:49-04:00

Self-healing and fault-tolerance properties in Multi Agent Sytems. Many works in Intrusion Detection Systems (IDS) use agents --commonly hierarchically organized-- to delegate roles in the system. One structural problem in these approaches is how to keep working when parent nodes fail. This situation often implies that nodes under the authority of corresponding parent nodes stop working. Aditionally, a system presents self-healing properties when it automatically recovers from failures and mista…

gallery

2008-10-15T23:01:39-04:00

* PERU, live the legend

gameoflife

2009-03-26T00:12:23-04:00

Sequential version: The Game of Life consists on a set of well-defined rules: Given a position (i,j) in the array M int neighbors=0; int value=0; for (int m=-1; m<2;m++) { for (int n=-1; n<2;n++) { if(m!=n && M [i+m][j+n]) neighbors++; } } //rules if(current_grid[i][j] ==1 && neighbors < 2) M[i][j] = 0; else if(current_grid[i][j] == 1 && (neighbors == 2 || neighbors ==3)) M[i][j] = 1; else if(current_grid[i][j] ==1 neighbors > 3) M[i][j] = 0; else if(current_grid[i][j…

hcicompany

2009-01-12T14:52:30-04:00

We built VOICE2SQL with the goal of offering alternative ways for disable people to interact with computers and databases. Since the information accessed by computers is commonly stored in databases, a method to retrieve information from databases by using voice and natural language (English, Spanish) has always been thought as an ideal solution for this problem.

hintsgrads

2010-01-27T00:48:36-04:00

Evaluating a research paper * ACM The task of the referee by Alan Jay Smith : link Ph.D. thesis * H.T. Kung's advice on useful things to know about Ph.D. thesis research : link Writing Technical Papers * Tips for Writing Technical Papers, Jennifer Widom : link

hintsundergrads

2008-07-28T00:00:15-04:00

Documents * A brief analysis I wrote about the undergraduate research within the Peruvian context can be found in the [bulletin of the Peruvian Computer Society (page 4)] for June 2008. Writing technical articles * Henning Schulzrinne: * Synonyms: * Style writing 1 * Common Errors in English * The American Heritage Book of English Usage

home_page

2010-05-05T19:53:06-04:00

I am a Ph.D. candidate in Computer Science at Utah State University. As a Research Assistant under Dr. Curtis Dyreson, I develop projects in the area of Video Indexing, Stream Data Mining, Scalable Indexing, Clustering and Similarity Search of unstructured data like Human Motion and Text Information. Parallel computing and human-computer interaction (HCI) are also high interest topics.Please take a look to our Research Projects and their corresponding Publications.You can play with our online Hu…

homepage

2010-07-20T16:24:53-04:00

I am a Research Intern at IBM Almaden Research Center. I am also doing my Ph.D. in Computer Science at Utah State University. I was born in Peru and came to the US to work as a Research Assistant in projects on Traffic Understanding in Video Sequences, Clustering and Indexing of Unstructured Data (Videos, Music, Human Motion, and Multimedia Databases), Stream Data Mining, Parallel Computing, and Information Retrieval by Similarity.Please take a look to our Research Projects and their correspondi…

how-to-write-a-paper

2008-08-10T20:44:11-04:00

incomingevents

2010-02-08T21:57:22-04:00

* March 29: presenting a paper to the 11th ACM SIGMM International Conference on Multimedia Information Retrieval, Philadelphia, Pennsylvania. * September 2009: PhD Qualification Exam: done :). * September 2009: Paper submission to ACM International Conference on Multimedia Information Retrieval (Sept 21). * June 2009: Paper submission to ICDM (Jun 26). * May 2009: Final submission of the book chapter on “Self-Organizing Maps”, ISBN 978-953-7619-X-X. * April 2009: Traveling to Taipe…

internships

2009-08-21T12:55:55-04:00

* * * * * * *

kdd09

2009-04-27T11:52:16-04:00

Querying Variable-Dimensional Data Through Random Hashing Human Motion Capture Data. Original figure modified from M. Muller, T. Roder, and M. Clausen, “Efficient content-based retrieval of motion capture data,” in SIGGRAPH ’05: ACM SIGGRAPH 2005 Papers. New York, NY, USA: ACM, 2005, pp. 677–685

menu1

2008-11-01T01:34:36-04:00

* Home * Curriculum Vitae (PDF) * Events * Useful links

mobilebrowsing

2009-08-10T16:46:11-04:00

GPS technology, currently very common in modern cellphones, can provide valuable information to browse some specific regions such as university campus, airports, and downtowns. In this video, we use position information of buildings and services to visually explore the Utah State University main campus. You may want to compare this application with the existing one at .

other

2009-07-09T15:53:30-04:00

Digital libraries * IEEE Xplore: * ACM Digital Library: * USU Interlibrary Services: Interesting readings * Nature Journal * Statistics at Columbia University * (Scientific documentaries in Spanish) * The DONTCLICK project (try alternative interfaces) * Description of Fallacies * Can We Predict Earthquakes? (Jessica Robertson and Mike Bla…

parallel-mandelbrot-set

2009-03-06T16:11:02-04:00

Displaying the Mandelbrot set is an example of how parallel algorithms can be applied to process SPMD (single-program, multiple-instruction) algorithms. SPMD problems consist on intended --or disconnected-- computational processes that solve a general case.

phdcourses

2010-01-21T13:09:40-04:00

* CS 7650 - Pattern Classification * CS 7680 - Advanced Computer Vision * CS 7970 - Dissertation Research * CS 6980 - Natural Language Processing * CS 7350 - Patterns in Software * CS 7970 - Dissertation Research * CS 6980 - Mobile Device Software Development * CS 5890 - Usability Testing

projects

2010-06-24T18:35:13-04:00

Research Projects * Note: All the texts, images, and videos here are copyrighted and belong to the author. Republishing of this work must be correctly cited and asked for permission. Contact email: omar DOT florez AT aggiemail DOT usu DOT edu ----------

publications

2010-07-17T00:41:44-04:00

Refereed Conference Proceedings * [October 2010] Omar U. Florez and Curtis Dyreson, Mining Rules to Explain Activities in Videos, to appear in 19th ACM Conference on Information and Knowledge Management (CIKM 2010), Toronto, Canada. Acceptance rate: 17.9%. * [March 2010] Omar U. Florez, Alexander Ocsa, and Curtis Dyreson, Sublinear Similarity Search of Realistic Timeseries and its Application to Human Motion, in 11th ACM SIGMM International Conference on Multimedia Information Retrieval (M…

quotes

2008-10-21T20:03:31-04:00

* Computer science is no more about computers than astronomy is about telescopes. ~E. W. Dijkstra. * Science is to computer science as hydrodynamics is to plumbing. ~Stan Kelly-Bootle. * The principal focus of computer science is studying the properties of computation in general, while the principal focus of software engineering is the design of specific computations to achieve practical goals, making the two separate but complementary disciplines. ~David Parnas * Science is built up wi…

resume

2008-03-19T01:26:15-04:00

retrieve-human-motions

2010-05-20T17:43:52-04:00

Research Projects Timeseries are an important representation of the behavior of processes over uniform time intervals. They are widely used in various fields such as robotics, gene expression, electrocardiograms, stock market quotes, and multimedia data. In this work, we focus on an important and interesting special case: the representation of motion, recorded from live actors and described as a timeseries.

retrieve-humanmotions

2009-10-18T15:19:36-04:00

sidebar

2010-06-24T22:35:58-04:00

MAIN * Home * Contact information * Resume (PDF) RESEARCH * :!: Publications * :!: Research projects * Tutorials * Achievements * PhD courses taken or in progress * :!: My Blog

timeseries-video

2010-05-20T17:39:29-04:00

We propose a novel algorithm to extract interpretable time series from video to characterize motion embedded in the video. Our method relies on describing the motion exposed in a video as a collection of spatiotemporal gradients. Each gradient models a unique position in the video representing high variations both in space and time. The variation is measured as the change of one point with respect to its spatiotemporal neighborhood. Rather than obtaining a coarse sampling of the motion by taking…

timeseriesretrieval

2009-08-07T21:33:02-04:00

Omar U. Florez and Alexander Ocsa Overview The expansion of Internet has brought us a large amount of multimedia data that we want to access almost instantly. Hence, numerous works have provided efficient algorithms to represent multimedia data as a succinct and variable-length type of data named time series. Time series can efficiently be stored in memory and transmitted on networks, but we still require incremental data structures explicitly designed to index and query time series. However…

traffic-understanding

2010-06-22T00:14:50-04:00

A sequence that contains three types of activities G1, G2, and G3 in different frames. Only moving objects yields activities based on events, represented as points in each group. We want to find groups of objects performing the same activity, represented as points with different colors. Our goal in this project is to automatically learn an unknown number of types of activities G = {G1, G2, ...} such that they can describe scenes in video data. As an example, the following rule can be extracte…

traffic_understanding

2010-06-23T18:57:45-04:00

tsp

2009-04-22T03:54:25-04:00

The TSP can be solved with a genetic algorithm approach if we consider the sequence of cities as a pattern with certain features: * Each integer element represents the id of a city. * No city is repeated in the pattern (no city visited twice). * The length of the path traversed can be computed if we evaluate the sum of distances of contiguous elements in the pattern (fitness evaluation).

tutorials

2010-04-06T20:04:01-04:00

* Sequential and parallel Mandelbrot Set. * Sequential and parallel Game of Life. * Sequential and parallel TSP with genetic algorithms. * How to write a paper in Computer Science.

very-fast-retrieval-video

2010-05-20T19:33:20-04:00

Very fast retrieval of human motion in video data Retrieving human motion in video data requires a good description based on their most important features. In this project we want represent an activity performed in video with events which are robust against camera motion, illumination changes, and shadows. Our approach is summarized in the next figure.

voice2sql

2009-07-11T22:30:05-04:00

Voice2SQL. For many people the use of traditional interfaces (mouse, keyboard) are not suitable, e.g. blind people or people with Parkinson's desease. In that context, the use of voice as input method and natural language as language structure seems to be a more effective interface. Thus, the goal of Voice2SQL is to recover information from databases using spoken natural language. Roughly speaking, a one-directional translation between two languages is achieved: Spoken language to SQL sent…

webpagefriends

2010-01-12T17:35:54-04:00

Web pages of friends * Alvarez, Marco A. * Beltran, Cesar * Cuadros-Vargas, Ernesto * Hinchey, Mike