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Search Results: 1 - 10 of 153107 matches for " Steven F. Quigley "
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FPGA Implementation for GMM-Based Speaker Identification
Phaklen EhKan,Timothy Allen,Steven F. Quigley
International Journal of Reconfigurable Computing , 2011, DOI: 10.1155/2011/420369
Abstract: In today's society, highly accurate personal identification systems are required. Passwords or pin numbers can be forgotten or forged and are no longer considered to offer a high level of security. The use of biological features, biometrics, is becoming widely accepted as the next level for security systems. Biometric-based speaker identification is a method of identifying persons from their voice. Speaker-specific characteristics exist in speech signals due to different speakers having different resonances of the vocal tract. These differences can be exploited by extracting feature vectors such as Mel-Frequency Cepstral Coefficients (MFCCs) from the speech signal. A well-known statistical modelling process, the Gaussian Mixture Model (GMM), then models the distribution of each speaker's MFCCs in a multidimensional acoustic space. The GMM-based speaker identification system has features that make it promising for hardware acceleration. This paper describes the hardware implementation for classification of a text-independent GMM-based speaker identification system. The aim was to produce a system that can perform simultaneous identification of large numbers of voice streams in real time. This has important potential applications in security and in automated call centre applications. A speedup factor of ninety was achieved compared to a software implementation on a standard PC. 1. Introduction Speaker recognition is an important branch of speech processing. It is the process of automatically recognizing who is speaking by using speaker-specific information included in the speech waveform. It is receiving increasing attention due to its practical value and has applications ranging from police work to automation of call centers. Speaker recognition can be classified into speaker identification (discovering identity) and speaker verification (authenticating a claim of identity). A closed-set speaker identification system selects the speaker in the training set who best matches the unknown speaker. Open-set speaker identification allows for the possibility that the unknown speaker may not exist in the training set; thus, an additional decision alternative is required for the unknown speaker who does not match any of the models in the training set [1]. Reconfigurable computing systems use reconfigurable hardware to augment a CPU-based system. The application is decomposed into parts running on the CPU and parts running on the reconfigurable hardware, which is used to form a custom hardware accelerator for the portions of the algorithm that are capable of
Computer-based formative assessment to promote reflection and learner autonomy
Susan Bull,Steven Quigley,Andrew Mabbott
Engineering Education , 2006,
Abstract: This paper introduces a computer-basedsystem primarily for formative assessmentto help learners identify their knowledge,difficulties and misconceptions in a subjectin order that they can focus their effortswhere most required. The system constructsa dynamic model of students’ understandingas they answer questions which iscontinually updated as they interact further.Students can view this individual ‘learnermodel’ which offers simple representationsof their knowledge state. They can alsocompare their knowledge level with thatof their peer group and with instructorexpectations for the current stage of thecourse. Instructors can set up their ownquestions to ensure that the environment issuitable for their specific courses. The aimis to help learners identify their knowledge,difficulties and misconceptions, engagein prompt reflection on their knowledgeand learning and facilitate planning, thusencouraging learner autonomy. We presentthe results of use of the system in fiveuniversity courses in Electronic, Electricaland Computer Engineering.
The Potential of Photo-Talks to Reveal the Development of Scientific Discourses  [PDF]
Cassie Quigley, Gayle Buck
Creative Education (CE) , 2012, DOI: 10.4236/ce.2012.32033
Abstract: This study explores the potential of a photo-elicitation technique, photo-talks (Serriere, 2010), for understanding how young girls understand, employ and translate new scientific discourses. Over the course of a nine week period, 24 kindergarten girls in an urban girls’ academy were observed, videotaped, photographed and interviewed while they were immersed into scientific discourse. This paper explicitly describes how their emerging discursive patterns were made visible through this methodological tool. The findings are presented in vignettes in three themes uncovered during our analysis which are the following: Presented the recollection of the scientific Discourse, Described the understanding of scientific Discourse, and Created an opportunity for the translation into everyday discourse. Science educators can benefit from this methodological tool as a reflective tool with their participants, to validate and/or complicate data. Additionally, this methodological tool serves to make discourse patterns more visible by providing a visual backdrop to the conversations thus revealing the development as it is occurring in young children.
Survival Model Inference Using Functions of Brownian Motion  [PDF]
John O’Quigley
Applied Mathematics (AM) , 2012, DOI: 10.4236/am.2012.36098
Abstract: A family of tests for the presence of regression effect under proportional and non-proportional hazards models is described. The non-proportional hazards model, although not completely general, is very broad and includes a large number of possibilities. In the absence of restrictions, the regression coefficient, β(t), can be any real function of time. When β(t) = β, we recover the proportional hazards model which can then be taken as a special case of a non-proportional hazards model. We study tests of the null hypothesis; H0:β(t) = 0 for all t against alternatives such as; H1:∫β(t)dF(t) ≠ 0 or H1:β(t) ≠ 0 for some t. In contrast to now classical approaches based on partial likelihood and martingale theory, the development here is based on Brownian motion, Donsker’s theorem and theorems from O’Quigley [1] and Xu and O’Quigley [2]. The usual partial likelihood score test arises as a special case. Large sample theory follows without special arguments, such as the martingale central limit theorem, and is relatively straightforward.
El papel de los antidepresivos en el manejo del síndrome de intestino irritable
Quigley,Eamonn MM; Craig,Orla F; Dinan,Timothy G;
Revista Colombiana de Gastroenterologia , 2011,
Abstract: irritable bowel syndrome (ibs) is a complex entity whose etiology is unknown and whose physiopathology is incompletely known. it occurs frequently, and many treatments for it have been described. the relation of psycho-social factors to the genesis and presentation of ibs has been studied with special attention. the approach to treating ibs patients requires contemplation of the patient?s symptoms and reactions to his or her illness and environment. of the multiple treatments for ibs which have been described, antidepressants have received considerable attention although their clinical utility is still not clear. the objective of this work is to review the literature regarding the physiopathological basis of ibs, comorbidities with psychiatric disorders, and the clinical usefulness of antidepressants for treating irritable bowel syndrome.
El papel de los antidepresivos en el manejo del síndrome de intestino irritable The role of antidepressants in the management of irritable bowel syndrome (IBS)
Eamonn MM Quigley,Orla F Craig,Timothy G Dinan
Revista Colombiana de Gastroenterologia , 2011,
Abstract: El síndrome de intestino irritable es una entidad compleja, de etiología desconocida y fisiopatología parcialmente comprendida, de frecuente ocurrencia y con múltiples tratamientos descritos. Se ha estudiado especialmente la relación de los factores psicosociales con la génesis y presentación de la entidad. El paciente requiere un enfoque que contemple sus síntomas, la reacción ante su enfermedad y su entorno. De los múltiples tratamientos descritos, los medicamentos antidepresivos han recibido considerable atención pero su utilidad clínica no es clara. El objetivo del presente trabajo es realizar una revisión enfocada de la literatura sobre las bases fisiopatológicas, la presencia de comorbilidad psiquiátrica y la utilidad clínica del uso de antidepresivos en este síndrome. Irritable Bowel Syndrome (IBS) is a complex entity whose etiology is unknown and whose physiopathology is incompletely known. It occurs frequently, and many treatments for it have been described. The relation of psycho-social factors to the genesis and presentation of IBS has been studied with special attention. The approach to treating IBS patients requires contemplation of the patient’s symptoms and reactions to his or her illness and environment. Of the multiple treatments for IBS which have been described, antidepressants have received considerable attention although their clinical utility is still not clear. The objective of this work is to review the literature regarding the physiopathological basis of IBS, comorbidities with psychiatric disorders, and the clinical usefulness of antidepressants for treating irritable bowel syndrome.
Constraints from ISO Data on the Velocity Law and Clumpiness of WR 136
R Ignace,M F Quigley,J P Cassinelli
Physics , 2003, DOI: 10.1086/377597
Abstract: Observations with the Infrared Space Observatory (ISO) SWS spectrometer are used to constrain the velocity law and wind clumping of the well-studied Wolf-Rayet (WR) star WR 136 (HD 192163) (WN6). Because the free-free continuum opacity in WR winds increases steadily with wavelength in the IR, each point in the continuous spectrum may be regarded as forming in a pseudo-photosphere of larger radius for longer wavelength. Using this idea in combination with an analysis of the Doppler-broadened widths of several \ion{He}{2} recombination lines, we can derive information about the velocity law and clumpiness of the stellar wind of WR 136. Adopting a $\beta$-law distribution for the outflow velocity law, we compute the continuous energy distribution and line profiles. Interestingly,the continuum data are found to constrain the wind to have fairly low clumping values for the IR-forming region.
拟南芥(Arabidopsis thaliana)VSP cDNA的克隆、鉴定及基因表达
喻德跃,F.Quigley,R.Mache
南京农业大学学报 , 1999, DOI: 10.7685/j.issn.1000-2030.1999.03.004
Abstract: 报道了从模式植物拟南芥花cDNA文库中分离鉴定的一个克隆。该cDNA的长度为887bp,其编译的蛋白质推断为268aa(氨基酸),与大豆营养贮藏蛋白(VSP)的同源率达50%。Northernblot分析表明,该基因在拟南芥叶片中仅有微量表达,但在花蕾、幼荚及茎中表达量丰富。采用发育后期的花为材料进行原位杂交,发现该基因的表达仅限制于子房壁。
Chronic Kidney Disease: Highlights for the General Pediatrician
Raymond Quigley
International Journal of Pediatrics , 2012, DOI: 10.1155/2012/943904
Abstract: Chronic kidney disease in the pediatric population has been increasing. Early detection and treatment can slow down the progression of kidney disease and help prevent the development of end stage renal disease. In addition, as the kidney function declines, there are many pathophysiologic interactions with other organ systems that need to be monitored and treated. In particular, because of impaired vitamin D metabolism, calcium and phosphorus homeostasis is dysregulated and results in secondary bone disease. Anemia is common due to a number of factors including impaired erythropoietin production. Growth is often impacted by chronic kidney disease but can be improved by proper treatment. Complications of chronic kidney disease can be minimized by proper monitoring and treatment of these parameters. The general pediatrician plays a critical role in this process.
Welcome to Computers––A New Open Access Journal for Computer Science
Aaron Quigley
Computers , 2012, DOI: 10.3390/computers1010001
Abstract: For the past seven decades, computers have radically changed the world we live in. From machines for calculation, computers are now platforms for information processing and computation, supporting the entire spectrum of human endeavour. While computer science is a relatively young field, it is shaping how people live in our modern world. There is not an area of human society that has not been affected by computers and the power they afford us. Computer science touches on every facet of science, art, engineering and economics. Its impact ranges from electronic commerce to improved medical devices; and from enhanced communication to new forms of media and entertainment. The future, with ubiquitous computational power and natural user interfaces, will extend and enhance all human capabilities. To reach this future we need to quickly and freely disseminate our cutting edge research results globally, and this journal aims to help us achieve that. [...]
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