检索结果-内蒙古大学图书馆

Annual International Conference of the IEEE engineering in Medicine and Biology Society (EMBC)

作者： A. Torres-Jimenez S. Charleston-Villalobos R. Gonzalez-Camarena G. Chi-Lem T. Aljama-Corrales Master student of the Biomedical Engineering Program Universidad Autonoma Metropolitana Mexicali Mexico Electrical Engineering Department Universidad Autonoma Metropolitana Mexicali Mexico Health Science Department Universidad Autonoma Metropolitana Mexicali Mexico Pulmonary Acoustic Laboratory National Institute of Respiratory Diseases Mexicali Mexico

Respiratory acoustic thoracic imaging (RATHI) permits analysing lung sounds (LS) temporal and spatial distribution, however, a deep understanding of RATHI repeatability associated with the pulmonary function is necessary. As a consequence, in the current work intrasubject variability of RATHI is evaluated at different airflows. For generating RATHIs, LS were acquired at the posterior thoracic surface. The associated image was computed at the inspiratory phases by interpolation through a Hermite function. The acoustic information of eleven subjects was considered at airflows of 1.0, 1.5 and 2.0 L/s. Several RATHIs were generated for each subject according to the number of acquired inspiratory phases. Quadratic mutual information based on Cauchy-Schwartz inequality (I CS ) was used to evaluate the degree of similitude between intrasubject RATHIs. The results indicated that, for the same subject, I CS averaged 0.893, 0.897, and 0.902, for airflows of 1.0, 1.5, and 2 L/s, respectively. In addition, when the airflow was increased, increments in intensity values and in the dispersion of the spatial distribution reflected in RATHI were observed. In conclusion, since the intrasubject variability of RATHI was low for airflows between 1.0 and 2.0 L/s, the pattern of sound distribution during airflow variations is repeatable but differences in sound intensity should be considered.

关键词：

来源：评论

学校读者我要写书评

暂无评论

Base lung sound in diffuse interstitial pneumonia analyzed by linear and nonlinear techniques

Base lung sound in diffuse interstitial pneumonia analyzed b...

引用

Annual International Conference of the IEEE engineering in Medicine and Biology Society (EMBC)

作者： L. Albuerne-Sanchez S. Charleston-Villalobos R. Gonzalez-Camarena G. Chi-Lem J.G. Carrillo T. Aljama-Corrales Master student of the Biomedical Engineering Program Universidad Autónoma Metropoiitana Mexicali Mexico Electrical Engineering Department Universidad Autónoma Metropoiitana Mexicali Mexico Health Science Department Universidad Autónoma Metropoiitana Mexicali Mexico National Institute of Respiratory Diseases Mexicali Mexico

Abnormal lung sounds in diffuse interstitial pneumonia have been characterized by the presence of crackles. However, few attempts have tried to analyze the sound where crackles are immersed. In this work base lung sounds (BLS) were analyzed by linear and nonlinear techniques to find possible differences between normal subjects and patients with diffuse interstitial pneumonia. In both groups, segments of lung sounds (crackles absent) and segments of BLS (lung sound in between crackles) were analyzed from acquired lung sounds from four points at the posterior chest, two apical and two basal. In this study, 8 healthy subjects and 8 patients participated and BLS were analyzed by spectral percentiles and sample entropy. Although spectral percentiles and sample entropy (SampEn) tended to be lower in the group of patients, statistical differences (p<0.05) between normal subjects and patients were found in BLS at the left hemithorax at basal and apical regions, while at the right hemithorax significant differences were found only at the basal region using the nonlinear technique. We conclude that in respect to normal subjects, BLS of patients with diffuse interstitial pneumonia present differences as assessed by SampEn, so that BLS by itself provides useful information. Moreover, it seems that nonlinear technique did a better discrimination of abnormal BLS than spectral percentile parameters.

关键词： Lung Diseases Sensors Entropy Urban areas Dispersion Frequency control

来源：评论

学校读者我要写书评

暂无评论

Mechanisms of scent-tracking in humans (vol 10, pg 27, 2007)

引用

NATURE NEUROscience 2007年第2期10卷 263-263页

作者： Porter, Jess Craven, Brent Khan, Rehan M. Chang, Shao-Ju Kang, Irene Judkewitz, Benjamin Volpe, Jason Settles, Gary Sobel, Noam 299 Life Science Addition MC 3200 Program in Biophysics University of California Berkeley Berkeley California 94720 USA. Department of Mechanical and Nuclear Engineering Penn State University University Park Pennsylvania 16802 USA. Department of Psychology University of California Berkeley Berkeley California 94720 USA. Program in Bioengineering University of California Berkeley Berkeley California 94720 USA. Program in Bioengineering University of California Berkeley Berkeley California 94720 USA. Helen Wills Neuroscience Institute University of California Berkeley Berkeley California 94720 USA. Department of Mechanical and Nuclear Engineering Penn State University University Park Pennsylvania 16802 USA. Department of Mechanical and Nuclear Engineering Penn State University University Park Pennsylvania 16802 USA. Department of Neurobiology The Weizmann Institute of Science Rehovot Israel.

Whether mammalian scent-tracking is aided by inter-nostril comparisons isunknown. We assessed this in humans and found that (i) humans can scent-track, (ii) they improvewith practice, (iii) the human nostrils sample spatially distinct regions separated by approximately3.5 cm and, critically, (iv) scent-tracking is aided by inter-nostril comparisons. These findingsreveal fundamental mechanisms of scent-tracking and suggest that the poor reputation of humanolfaction may reflect, in part, behavioral demands rather than ultimate abilities.

关键词： Learning Odors Recognition (Psychology) Smell

来源：评论

学校读者我要写书评

暂无评论

Real-time recognition of traffic signs using opponent color filters

Real-time recognition of traffic signs using opponent color ...

引用

14th World Congress on Intelligent Transport Systems, ITS 2007

作者： Baba, Kyoko Hirai, Yuzo Master's Program in Graduate School of Systems and Information Engineering University of Tsukuba 1-1-1 Ten-nodai Tsukuba Ibaraki 305-8573 Japan Department of Computer Science Graduate School of Systems and Information Engineering University of Tsukuba 1-1-1 Ten-nodai Tsukuba Ibaraki 305-8573 Japan

ISBN: (纸本)9781617387777

In order to assist driver's vision, a real-time recognition system for traffic signs is proposed. After detecting sign candidates, biologically inspired opponent-color filters are used to extract symbol parts of signs. After normalizing the size of symbol, structural features are calculated to identify the sign. 5572 segmented images are used to design the algorithm. In a real-time system, the same sign in a sequence of frames is tracked, and a majority vote is used to integrate the recognition results. For test data, 93.8% recall rate and 99.3% precision rate could be attained. In-vehicle experiment also showed high recall and precision rates.

关键词： Traffic signs

来源：评论

学校读者我要写书评

暂无评论

Novel Preparation Methods for the Fabrication of Thin‐Film EXAFS Samples

引用

AIP Conference Proceedings 2007年第1期882卷 908-910页

作者： M. C. Ridgway C. J. Glover P. Kluth B. Johannessen G. J. Foran 1Department of Electronic Materials Engineering Australian National University Canberra Australia 2Australian Synchrotron Research Program Australian Nuclear Science and Technology Organisation Menai Australia

Thin‐film EXAFS samples have been fabricated using semiconductor‐processing and wet‐chemical etching techniques to eliminate artifacts associated with transmission and fluorescence measurements. Examples include crystalline GexSi1−x alloys, amorphous GaAs and Cu and Au nanocrystals in SiO2. In general, thin films of several microns thickness were first formed on bulk substrates then EXAFS samples were fabricated by separating the thin film and substrate. For transmission measurements, thin films were stacked together to yield the optimum absorption while sample inhomogeneity, non‐uniformity and non‐continuity were readily eliminated. For fluorescence measurements, scattering/diffraction from the substrate was eliminated and stacking the thin films together increased the areal concentration of the absorber. The use of such techniques to fabricate EXAFS samples yielded a significant increase in accessible photo‐electron wave number range and hence more accurate structural parameter determinations.

关键词：

来源：评论

学校读者我要写书评

暂无评论

A Novel Method Improving the Imaging Resolution of a Table-top Compton Camera

A Novel Method Improving the Imaging Resolution of a Table-t...

引用

2007 IEEE nuclear science Symposium Conference (NSS 2007), vol.7

作者： Hee Seo Se Hyung Lee Jong Hwi Jeong Ju Hahn Lee Chun Sik Lee Jae Sung Lee Chan Hyeong Kim Department of Nuclear Engineering Hanyang University Seoul South Korea Department of Physics Chung-Ang University Seoul South Korea Department of Nuclear Medicine and Interdisciplinary Program in Radiation Applied Life Science Seoul National University Seoul South Korea

For a table-top Compton camera, which is currently under development in our group, the interaction position resolution of the absorber detector is a critical or limiting detector parameter that most seriously affects the imaging resolution of the Compton camera. Currently, it is assumed that all the interactions occur at the centers of the detector segments of the absorber detector, which is simple, but obviously not the best choice considering that the interaction depths of the photons in the absorber detector is not distributed uniformly, especially for the low-energy photons. To this end, the present study develops a novel method, called "average interaction depth (AID) method" to improve the imaging resolution of Compton camera by additionally considering the interaction depth of the incident photon in the absorber detector. Our simulation studies with Geant4 show that the imaging resolution of Compton camera can be significantly improved by using the AID method. The imaging resolution of the table-top Compton camera was improved from 9.9mm to 7.6mm in full width at half maximum (FWHM) for a 511keV γ point source. For a 364keV γ point source, the imaging resolution was improved more significantly, i.e., from 11.4mm to 7.2mm.

关键词： Image resolution Cameras

来源：评论

学校读者我要写书评

暂无评论

Fully three-dimensional image reconstruction for compton imaging using ordered subsets of conical projection data

Fully three-dimensional image reconstruction for compton ima...

引用

IEEE Symposium on nuclear science (NSS/MIC)

作者： Soo Mee Kim Jae Sung Lee Soo-Jin Lee Department of Nuclear Medicine and Interdisciplinary Program in Radiation Applied Life Science College of Medicine and Institute of Radiation Medicine Medical Research Center Seoul National University South Korea Electronic Engineering Department Pai Chai University Daejeon South Korea

The Compton camera has recently been recognized as a promising three-dimensional imaging modality with higher sensitivity and unlimited field-of-view. Due to computational limitations, however, it has been of a difficult problem to develop reconstruction algorithms with good. In this study, we propose efficient methods for implementing the OSEM (ordered-subsets expectation-maximization) algorithm for Compton camera reconstruction, and investigate three different schemes for grouping Compton scattered data into ordered subsets. The first is to group the data according to a pre-set order of scattering angles, the second is to group the possible combinations of detected position pairs in the scatterer and the absorber, and the third is to combine the first and second methods. According to our experimental results, all of the three grouping schemes exhibit similar performance in terms of the quantitative accuracy and computational efficiency. Our results show that the OSEM algorithm applied to the Compton camera provides an order improvement in speed of execution while retaining overall quality of the image reconstructed by the standard EM algorithm.

关键词： Image reconstruction Electromagnetic scattering Particle scattering Cameras Biomedical imaging Event detection Reconstruction algorithms Position sensitive particle detectors Telephony Collimators

来源：评论

学校读者我要写书评

暂无评论

TRIM modeling of displacement damage in SiC for monoenergetic neutrons

Journal of ASTM International

引用

Journal of ASTM International 2006年第8期3卷

作者： Khorsandi, B. Blue, T.E. Windl, W. Kulisek, J. Ohio State University Nuclear Engineering Program Columbus OH 43202 Ohio State University Department of Materials Science and Engineering Columbus OH 43210

Although silicon carbide is a very good semiconductor material for the fabrication of diode detectors for use as neutron power monitors in nuclear reactors, the electrical properties of the diodes may be altered because of interactions between energetic neutrons and SIC atoms. If the energy that is transferred from a neutron to an atom in a collision exceeds some threshold value, the atom will be moved from its original position, creating displacement damage. Accurately modeling displacement damage is a first step to finding ways to eliminate or decrease the amount of damage the displacements induce. The methodology that we have used to estimate the number of displacements per atom per fluence, using two codes (MCNP and TRIM) is presented in this paper, along with examples of the results of our calculations. Copyright © 2006 by ASTM International.

关键词： Silicon carbide

来源：评论

学校读者我要写书评

暂无评论

A light-weight tool for teaching the development and evaluation of requirements documents

A light-weight tool for teaching the development and evaluat...

引用

113th Annual ASEE Conference and Exposition, 2006

作者： Garbers, Ben Periyasamy, Kasi University of Wisconsin La Crosse United States Master of Software Engineering Program University of Wisconsin La Crosse United States IBM Computer Science Department Program University of Wisconsin La Crosse United States

Writing correct and consistent software requirements specification (SRS) is one of the most important goals of a requirements engineering process. The SRS serves as the basis for subsequent design, testing and maintenance of the software product. The more errors and inconsistencies contained in an SRS, the more time and efforts are required to correct them at a later stage in the development process. Most SRS documents are manually typed using a word processor and hence the writer is responsible for ensuring the correctness and consistency of the document. Without adequate tool support, the manual construction and analysis of SRS documents is a tedious process and is error-prone. This paper describes an interactive tool developed at the University of Wisconsin-La Crosse that assists students preparing an SRS document based on the IEEE standard 83019981. The tool provides an easy-to-use interface and the ability to create, edit, load and save SRS documents. In addition, it evaluates the requirements document based on criteria published by the Software Metrics program at the Software Assurance Technology Center, NASA2. A function-point metrics analyzer is also built into the tool so that the efforts required to complete the project specified in the document can be evaluated. © American Society for engineering Education, 2006.

关键词： Computer aided software engineering

来源：评论

学校读者我要写书评

暂无评论

The 2+2 scholars program: Collaborative undergraduate nuclear engineering education in Idaho

The 2+2 scholars program: Collaborative undergraduate nuclea...

引用

113th Annual ASEE Conference and Exposition, 2006

作者： Dunzik-Gougar, Mary Lou Lineberry, Michael Bond, Leonard Idaho State University United States Institute of Nuclear Science and Engineering ISU United States 2+2 Nuclear Engineering Scholarship Program Institute of Nuclear Science and Engineering Idaho State University University of Idaho United States Department of Nuclear Engineering ISU Idaho National Laboratory United States Center for Advanced Energy Studies Idaho National Laboratory United States

The 2 + 2 Scholars program brings together nuclear engineering undergraduate students from three Idaho universities - Idaho State University (ISU), the University of Idaho (UI), and Boise State University (BSU) - to spend their junior and senior years in Idaho Falls, attending classes at University Place (a joint campus of ISU and UI) while working as interns at the department of Energy's Idaho National Laboratory (INL) and using INL facilities for coursework. Scholarship funds are provided by the AREVA Group and the DOE. © American Society for engineering Education, 2006.

关键词： nuclear engineering

来源：评论

学校读者我要写书评

暂无评论

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

请选择保存的检索档案：

请选择收藏分类：

通借通还

建议与咨询 留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

请选择保存的检索档案： 新增检索档案 确定 取消

请选择收藏分类： 新增自定义分类 确定 取消

通借通还

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

请选择保存的检索档案：

请选择收藏分类：