Query vector space model VSM design and active node selection.docx

1、Query vector space model VSM design and active node selectionSulcal and gyral landmarks on the human cerebral cortex are required for various studies of the human brain. Whether used directly to examine sulcal geometry, or indirectly to drive cortical surface registration methods, the accuracy of th

2、ese landmarks is essential. While several methods have been developed to automatically identify sulci and gyri, their accuracy may be insufficient for certain neuroanatomical studies. We describe a semi-automated procedure that delineates a sulcus or gyrus given a limited number of user-selected poi

3、nts. The method uses a graph theory approach to identify the lowest-cost path between the points, where the cost is a combination of local curvature features and the distance between vertices on the surface representation. We implemented the algorithm in an interface that guides the user through a c

4、ortical surface delineation protocol, and we incorporated this tool into our BrainSuite software. We performed a study to compare the results produced using our method with results produced using Display, a popular tool that has been used extensively for manual delineation of sulcal landmarks. Six r

5、aters were trained on the delineation protocol. They performed delineations on 12 brains using both software packages. We performed a statistical analysis of 3 aspects of the delineation task: time required to delineate the surface, registration accuracy achieved compared to an expert-delineated gol

6、d-standard, and variation among raters. Our new method was shown to be faster to use, to provide reduced inter-rater variability, and to provide results that were at least as accurate as those produced using Display.Article Outline1. Introduction2. Methods 2.1. Curve-tracking procedure 2.1.1. Convex

7、ity measure2.1.2. Graph weighting2.1.3. Path computation2.2. Software implementation 2.2.1. Landmark identification2.2.2. Protocol interface2.3. Validation methodology 2.3.1. Time efficiency2.3.2. Delineation accuracy2.3.3. Inter-rater variability3. Results 3.1. Time performance3.2. Delineation accu

8、racy3.3. Inter-rater variability4. DiscussionAcknowledgementsReferencesPurchase$ 35.95386A review on the integration of artificial intelligence into coastal modelingOriginal Research ArticleJournal of Environmental Management, Volume 80, Issue 1, July 2006, Pages 47-57Kwokwing ChauClose preview| Rel

9、ated articles|Related reference work articles AbstractAbstract | Figures/TablesFigures/Tables | ReferencesReferences AbstractWith the development of computing technology, mechanistic models are often employed to simulate processes in coastal environments. However, these predictive tools are inevitab

10、ly highly specialized, involving certain assumptions and/or limitations, and can be manipulated only by experienced engineers who have a thorough understanding of the underlying theories. This results in significant constraints on their manipulation as well as large gaps in understanding and expecta

11、tions between the developers and practitioners of a model. The recent advancements in artificial intelligence (AI) technologies are making it possible to integrate machine learning capabilities into numerical modeling systems in order to bridge the gaps and lessen the demands on human experts. The o

12、bjective of this paper is to review the state-of-the-art in the integration of different AI technologies into coastal modeling. The algorithms and methods studied include knowledge-based systems, genetic algorithms, artificial neural networks, and fuzzy inference systems. More focus is given to know

13、ledge-based systems, which have apparent advantages over the others in allowing more transparent transfers of knowledge in the use of models and in furnishing the intelligent manipulation of calibration parameters. Of course, the other AI methods also have their individual contributions towards accu

14、rate and reliable predictions of coastal processes. The integrated model might be very powerful, since the advantages of each technique can be combined.Article Outline1. Introduction2. Numerical modeling 2.1. Model manipulation2.2. Generations of modeling3. Incorporation of AI into modeling 3.1. Kno

15、wledge-based systems (KBSs)3.2. Genetic algorithms (GAs)3.3. Artificial neural networks (ANNs)3.4. Fuzzy inference systems4. Future directions5. ConclusionsAcknowledgementsReferencesPurchase$ 41.95387Development of a CAD/CAM system for the closed-die forging processOriginal Research ArticleJournal o

16、f Materials Processing Technology, Volume 138, Issues 1-3, 20 July 2003, Pages 436-442M. Jolgaf, A. M. S. Hamouda, S. Sulaiman, M. M. HamdanClose preview| Related articles|Related reference work articles AbstractAbstract | Figures/TablesFigures/Tables | ReferencesReferences AbstractThe application o

17、f computer-aided engineering (CAE), computer-aided design (CAD), and computer-aided manufacturing (CAM), is essential in modern metal forming technology. Thus, the process of modelling for the investigation and understanding of deformation mechanics has become a major concern in recent and advanced

18、research, and the finite element method (FEM) has assumed increased importance, particularly in the modelling of deformation processes. This work is devoted to the development of a CAD/CAM system for the closed-die forging process. The system development consists of three stages: namely, metal flow

19、simulation, die failure analysis and design optimisation, and the development and implementation of a machining code. In the first stage, the FEM was used to simulate the axisymmetric closed-die forging process of copper material. The method is used to study the metal flow; die filling, retaining th

20、e non-linearity involved in the large change in the geometry; the continuous change in the contact surface condition; and the isotropic material work-hardening characteristics. In the second stage, a finite element analysis and optimisation algorithm is developed to examine the die fatigue life and

21、to optimise the die design. The finite element analysis in the first and second stage was carried out using commercially available finite element software called LUSAS. In the third stage, a machining code for the optimised die is developed and implemented using CAD/CAM software called UniGraphics a

22、nd CNC machine.Article Outline1. Introduction2. Designing the die cavity3. FE simulation of axisymmetric closed-die forging 3.1. The simulation model3.2. Material properties3.3. Geometry3.4. The boundary conditions3.5. Mesh convergence study4. Results and discussion 4.1. Loaddisplacement curve4.2. M

23、aterial flow behaviour4.3. Displacement vectors4.4. Stress distribution5. Die analysis and optimisation 5.1. Die stresses and displacement distribution5.2. Die life and fatigue analysis5.3. CAM for the die6. ConclusionsReferencesPurchase$ 37.95388Food service research: An integrated approachReview A

24、rticleInternational Journal of Hospitality Management, Volume 30, Issue 2, June 2011, Pages 477-483Svetlana RodgersClose preview| Related articles|Related reference work articles AbstractAbstract | Figures/TablesFigures/Tables | ReferencesReferences AbstractFood production demands competencies in bo

25、th natural science and management principles. The suggested framework includes the following areas of research: technological innovation, process design (including Industrial Cuisine), product development (including Molecular Gastronomy, Industrial Gastronomy and Functional Meal) and risk management

26、 (including quantitative risk assessment and predictive microbiology). Developments stemming from food science and engineering could be combined with studies in operations management, consumer psychology, cognitive psychology, sociology and economics. The paper concludes that in order to meet societ

27、al demands for health, sustainability and efficiency a radical shift is neededfrom low tech recipe development and proliferation of marketing concepts to cutting edge technological innovation supported by advanced research in management and consumer studies.Article Outline1. Introduction2. Defining

28、research on food production3. Technological innovation4. Process design5. Product development6. Risk management7. ConclusionReferencesPurchase$ 41.95389Enhancing VoIP service for ubiquitous communication in a campus WLAN with partial coverageOriginal Research ArticleComputer Networks, Volume 52, Iss

29、ue 13, 17 September 2008, Pages 2489-2504Hung-Yun Hsieh, You-En Lin, Hsiao-Pu LinClose preview| Related articles|Related reference work articles AbstractAbstract | Figures/TablesFigures/Tables | ReferencesReferences AbstractThe IEEE 802.11 WLAN technology has become the de facto standard for wireles

30、s Internet access. The spotty coverage of WLAN access points, however, confines the applicability of many real-time services such as VoIP within the boundary of the WLAN service area. In this paper, we investigate the problem of enhancing VoIP service for ubiquitous communication in a WLAN with spot

31、ty service area. We consider a university campus that has an established infrastructure for supporting SIP-based VoIP service through either wired or wireless data networks. The campus WLAN service does not have 100% full coverage, and hence users cannot make untethered VoIP calls anywhere on campus

32、. The goal of this paper is to overcome the limitations of such “dead spots” for motivating the use of campus IP telephony service. To proceed, we start with two approaches called one-hop extension and dual-mode communication. The first approach uses multi-hop relay to extend the WLAN coverage, while the second approach