WorldWideScience

Sample records for aided design analysis

  1. ANALYSIS OF INTEGRATED COMPUTER AIDED DESIGN SYSTEMS FOR CONSTRUCTION OBJECTS

    OpenAIRE

    Pavlov Aleksandr Sergeevich; Lavdansky Pavel Aleksandrovich; Ignatiev Oleg Vladimirovich

    2012-01-01

    The paper contains classification of construction computer aided design systems, requirements to the single file format, providing their interaction within the frames of creation of integrated computer aided design systems, main principles and data transformation schemes are given.

  2. Performance Aided Design

    DEFF Research Database (Denmark)

    Parigi, Dario

    2014-01-01

    The paper present the methodologies and tools developed in the framework of Performance Aided Design (PAD), a term that indicates the shift in the use of Computer Aided Design (CAD) tools from a mere translation in a digital environment of the operations once carried on paper, to an evolving...... paradigm where the increasing integration of parametric tools and performative analysis is changing the way we learn and design. The term Performance Aided Architectural Design (PAD) is proposed at the Master of Science of Architecture and Design at Aalborg University, with the aim of extending a tectonic...... tradition of architecture with computational tools, preparing the basis for the creation of the figure of a modern master builder, sitting at the boundary of the disciplines of architecture and engineering. Performance Aided Design focuses on the role of performative analysis, embedded tectonics, and...

  3. Experimental stress analysis : an aid to design concessions

    International Nuclear Information System (INIS)

    The importance of experimental stress analysis in allowing design concessions during fabrication and erection is highlighted. Also, the design modifications which can be incorporated on the basis of experimental stress analysis have been illustrated. Experimental stress analysis of CANDU reactor components such as transition piece, water cooled thermal shield, fuelling machine head and end shield bogie wagon is described. (author)

  4. Computer aided design and analysis of gear tooth geometry

    Science.gov (United States)

    Chang, S. H.; Huston, R. L.

    1987-01-01

    A simulation method for gear hobbing and shaping of straight and spiral bevel gears is presented. The method is based upon an enveloping theory for gear tooth profile generation. The procedure is applicable in the computer aided design of standard and nonstandard tooth forms. An inverse procedure for finding a conjugate gear tooth profile is presented for arbitrary cutter geometry. The kinematic relations for the tooth surfaces of straight and spiral bevel gears are proposed. The tooth surface equations for these gears are formulated in a manner suitable for their automated numerical development and solution.

  5. Computer-aided design and analysis of mechanisms

    Science.gov (United States)

    Knight, F. L.

    1982-01-01

    An introduction to the computer programs developed to assist in the design and analysis of mechanisms is presented. A survey of the various types of programs which are available is given, and the most widely used programs are compared. The way in which the programs are used is discussed, and demonstrated with an example.

  6. Computer-Aided Design Software for Torsional Analysis

    OpenAIRE

    Griffin, Timothy R.

    1998-01-01

    The goal of this research has been the development of an effective design tool for torsional analysis. In the hopes of achieving this goal the computer program, Torsion 1, has been created. This torsional transfer matrix program provides the user with the ability to easily model multi-rotor systems using a simple user-interface. The program is capable of modeling such components or system characteristics as continuously distributed mass, viscous and structural damping, vibratio...

  7. Computer aided design environment for the analysis and design of multi-body flexible structures

    Science.gov (United States)

    Ramakrishnan, Jayant V.; Singh, Ramen P.

    1989-01-01

    A computer aided design environment consisting of the programs NASTRAN, TREETOPS and MATLAB is presented in this paper. With links for data transfer between these programs, the integrated design of multi-body flexible structures is significantly enhanced. The CAD environment is used to model the Space Shuttle/Pinhole Occulater Facility. Then a controller is designed and evaluated in the nonlinear time history sense. Recent enhancements and ongoing research to add more capabilities are also described.

  8. Computer Aided Design and Analysis of Separation Processes with Electrolyte Systems

    DEFF Research Database (Denmark)

    Takano, Kiyoteru; Gani, Rafiqul; Kolar, P.; Ishikawa, T.

    A methodology for computer aided design and analysis of separation processes involving electrolyte systems is presented. The methodology consists of three main parts. The thermodynamic part 'creates' the problem specific property model package, which is a collection of pure component and mixture...... process alternatives. For the simulation part, a general multi-purpose, multi-phase separation model has been developed and integrated to an existing computer aided system. Application of the design and analysis methodology is highlighted through two illustrative case studies, (C) 2000 Elsevier Science...... property models. The design and analysis part generates process (flowsheet) alternatives, evaluates/analyses feasibility of separation and provides a visual operation path for the desired separation. The simulation part consists of a simulation/calculation engine that allows the screening and validation of...

  9. Computer Aided Design and Analysis of Separation Processes with Electrolyte Systems

    DEFF Research Database (Denmark)

    A methodology for computer aided design and analysis of separation processes involving electrolyte systems is presented. The methodology consists of three main parts. The thermodynamic part "creates" the problem specific property model package, which is a collection of pure component and mixture...... property models. The design and analysis part generates process (flowsheet) alternatives, evaluates/analyses feasibility of separation and provides a visual operation path for the desired separation. The simulation part consists of a simulation/calculation engine that allows the screening and validation of...... process alternatives. For the simulation part, a general multi-purpose, multi-phase separation model has been developed and integrated to an existing computer aided system. Application of the design and analysis methodology is highlighted through two illustrative case studies....

  10. Computer Aided Design and Analysis of Separation Processes with Electrolyte Systems

    DEFF Research Database (Denmark)

    Takano, Kiyoteru; Gani, Rafiqul; Kolar, P.;

    2000-01-01

    A methodology for computer aided design and analysis of separation processes involving electrolyte systems is presented. The methodology consists of three main parts. The thermodynamic part 'creates' the problem specific property model package, which is a collection of pure component and mixture...... property models. The design and analysis part generates process (flowsheet) alternatives, evaluates/analyses feasibility of separation and provides a visual operation path for the desired separation. The simulation part consists of a simulation/calculation engine that allows the screening and validation of...... process alternatives. For the simulation part, a general multi-purpose, multi-phase separation model has been developed and integrated to an existing computer aided system. Application of the design and analysis methodology is highlighted through two illustrative case studies, (C) 2000 Elsevier Science...

  11. Computer Aided Design and Analysis of a 2-4 GHz Broadband Balanced Microstrip Amplifier

    Directory of Open Access Journals (Sweden)

    S. H. Ibrahim

    2012-07-01

    Full Text Available In this paper, a computer-aided design and analysis of a 2-4 GHz broadband balanced microstrip amplifier using a full computer simulation program developed by the author and others is presented. A short and efficient CAD procedure for broadband amplifier design is introduced. The first step is to design an initial narrow-band high gain microstrip amplifier at 3-GHz central frequency. The second step is to optimize the initial lengths and widths of the input and output microstrip-matching circuits to get the broadband amplifier over the range 2-4 GHz. The analysis of both narrow and broadband amplifiers is investigated. In addition, with the design and analysis of a low-pass microstrip filter, the paper introduces the design and analysis of a Lange coupler. The final AC schematic diagram of the designed amplifier with the lengths and widths of microstrip lines is presented.Key Words: Computer-Aided Design and Analysis, Microstrip Amplifier, Microwave Amplifier.

  12. Model-based Computer Aided Framework for Design of Process Monitoring and Analysis Systems

    DEFF Research Database (Denmark)

    Singh, Ravendra; Gernaey, Krist; Gani, Rafiqul

    2009-01-01

    In the manufacturing industry, for example, the pharmaceutical industry, a thorough understanding of the process is necessary in addition to a properly designed monitoring and analysis system (PAT system) to consistently obtain the desired end-product properties. A model-based computer......-aided framework including the methods and tools through which the design of monitoring and analysis systems for product quality control can be generated, analyzed and/or validated, has been developed. Two important supporting tools developed as part of the framework are a knowledge base and a model library....... The knowledge base provides the necessary information/data during the design of the PAT system while the model library generates additional or missing data needed for design and analysis. Optimization of the PAT system design is achieved in terms of product data analysis time and/or cost of monitoring equipment...

  13. Computer aided magnet design

    International Nuclear Information System (INIS)

    In this paper the elements of a computer aided magnet design system is outlined. The methods of solving the field equations are briefly reviewed, followed by a survey of available codes. Particular examples of the use of RAL codes in solving 3D magnetic design problems are given. Future developments are discussed. (author)

  14. Computer-aided analysis and design of the shape rolling process for producing turbine engine airfoils

    Science.gov (United States)

    Lahoti, G. D.; Akgerman, N.; Altan, T.

    1978-01-01

    Mild steel (AISI 1018) was selected as model cold rolling material and Ti-6A1-4V and Inconel 718 were selected as typical hot rolling and cold rolling alloys, respectively. The flow stress and workability of these alloys were characterized and friction factor at the roll/workpiece interface was determined at their respective working conditions by conducting ring tests. Computer-aided mathematical models for predicting metal flow and stresses, and for simulating the shape rolling process were developed. These models utilized the upper bound and the slab methods of analysis, and were capable of predicting the lateral spread, roll separating force, roll torque, and local stresses, strains and strain rates. This computer-aided design system was also capable of simulating the actual rolling process, and thereby designing the roll pass schedule in rolling of an airfoil or a similar shape.

  15. Computer aided product design

    DEFF Research Database (Denmark)

    Constantinou, Leonidas; Bagherpour, Khosrow; Gani, Rafiqul; Klein, J.A.; Wu, D.T.

    A general methodology for Computer Aided Product Design (CAPD) with specified property constraints which is capable of solving a large range of problems is presented. The methodology employs the group contribution approach, generates acyclic, cyclic and aromatic compounds of various degrees of......-liquid equilibria (LLE), solid-liquid equilibria (SLE) and gas solubility. Finally, a computer program based on the extended methodology has been developed and the results from five case studies highlighting various features of the methodology are presented....

  16. Computer aided product design

    DEFF Research Database (Denmark)

    Constantinou, Leonidas; Bagherpour, Khosrow; Gani, Rafiqul;

    1996-01-01

    A general methodology for Computer Aided Product Design (CAPD) with specified property constraints which is capable of solving a large range of problems is presented. The methodology employs the group contribution approach, generates acyclic, cyclic and aromatic compounds of various degrees......-liquid equilibria (LLE), solid-liquid equilibria (SLE) and gas solubility. Finally, a computer program based on the extended methodology has been developed and the results from five case studies highlighting various features of the methodology are presented....

  17. COMPUTER AIDED SOLVENT DESIGN FOR POLLUTION PREVENTION - PARIS II (SYSTEMS ANALYSIS BRANCH, SUSTAINABLE TECHNOLOGY DIVISION, NRMRL)

    Science.gov (United States)

    This method was designed to facilitate the replacement of environmentally objectionable industrial solvents by using computer aided methods to design benign replacement solvents or solvent mixtures. The method generates a short list of recommended replacement solvents or mixtures...

  18. A practical technique for benefit-cost analysis of computer-aided design and drafting systems

    International Nuclear Information System (INIS)

    Analysis of benefits and costs associated with the operation of Computer-Aided Design and Drafting Systems (CADDS) are needed to derive economic justification for acquiring new systems, as well as to evaluate the performance of existing installations. In practice, however, such analyses are difficult to perform since most technical and economic advantages of CADDS are ΣirreduciblesΣ, i.e. cannot be readily translated into monetary terms. In this paper, a practical technique for economic analysis of CADDS in a drawing office environment is presented. A Σworst caseΣ approach is taken since increase in productivity of existing manpower is the only benefit considered, while all foreseen costs are taken into account. Methods of estimating benefits and costs are described. The procedure for performing the analysis is illustrated by a case study based on the drawing office activities at Atomic Energy of Canada Limited. (auth)

  19. Computer Aided Methodology for Simultaneous Synthesis, Design & Analysis of Chemical Products-Processes

    DEFF Research Database (Denmark)

    d'Anterroches, Loïc; Gani, Rafiqul

    2006-01-01

    A new combined methodology for computer aided molecular design and process flowsheet design is presented. The methodology is based on the group contribution approach for prediction of molecular properties and design of molecules. Using the same principles, process groups have been developed toget...

  20. Computer-Aided Model Based Analysis for Design and Operation of a Copolymerization Process

    DEFF Research Database (Denmark)

    Lopez-Arenas, Maria Teresa; Sales-Cruz, Alfonso Mauricio; Gani, Rafiqul

    2006-01-01

    will allow analysis of the process behaviour, contribute to a better understanding of the polymerization process, help to avoid unsafe conditions of operation, and to develop operational and optimizing control strategies. In this work, through a computer-aided modeling system ICAS-MoT, two first-principles...... through the study of a copolymerization process, where operational problems due to their complex nonlinear behaviour are usually encountered, indicating thereby, the need for the development of an appropriate process model that can describe the dynamic behaviour over the complete range of conversion. This...... models have been investigated with respect to design and operational issues for solution copolymerization reactors in general, and for the methyl methacrylate/vinyl acetate system in particular. The Model 1 is taken from literature and is commonly used for low conversion region, while the Model 2 has...

  1. Constraint-Aided Product Design

    Directory of Open Access Journals (Sweden)

    G. Mullineux

    2005-01-01

    Full Text Available The importance of supporting the early stages of design is widely accepted. In particular, the development of supportive tools and methods for modelling and analysis of evolving design solutions present a difficult challenge. One reason for this is the need to model both the product design and the design knowledge from which the design is created. There are a number of limitations with many existing techniques and an alternative approach that deals with the design constraints themselves is presented. Dealing directly with the constraints affords a more generalised approach that represents the process by which a product is designed. This enables modelling and reasoning about a product from an often abstract and evolving set of requirements. The constraint methodology is an iterative process where the design requirements are elaborated, the constraint rules altered, design ideas generated and tested as functional structures. The incorporation of direct search techniques to solve the constrained problem enables different solutions to be explored and allows the determination of ‘best compromises’ for related constraints. A constraint modelling environment is discussed and two example cases are used to demonstrate the potential of a constraint-aided approach for supporting important issues such as the design of product variants and product families. 

  2. Analysis of three-phase power-supply systems using computer-aided design programs

    International Nuclear Information System (INIS)

    A major concern of every designer of large, three-phase power-supply systems is the protection of system components from overvoltage transients. At present, three computer-aided circuit design programs are available in the Magnetic Fusion Energy (MFE) National Computer Center that can be used to analyze three-phase power systems: MINI SCEPTRE, SPICE I, and SPICE II. These programs have been used at Lawrence Livermore Laboratory (LLL) to analyze the operation of a 200-kV dc, 20-A acceleration power supply for the High Voltage Test Stand. Various overvoltage conditions are simulated and the effectiveness of system protective devices is observed. The simulated overvoltage conditions include such things as circuit breaker openings, pulsed loading, and commutation voltage surges in the rectifiers. These examples are used to illustrate the use of the computer-aided, circuit-design programs discussed in this paper

  3. Computer-aided system design

    Science.gov (United States)

    Walker, Carrie K.

    1991-01-01

    A technique has been developed for combining features of a systems architecture design and assessment tool and a software development tool. This technique reduces simulation development time and expands simulation detail. The Architecture Design and Assessment System (ADAS), developed at the Research Triangle Institute, is a set of computer-assisted engineering tools for the design and analysis of computer systems. The ADAS system is based on directed graph concepts and supports the synthesis and analysis of software algorithms mapped to candidate hardware implementations. Greater simulation detail is provided by the ADAS functional simulator. With the functional simulator, programs written in either Ada or C can be used to provide a detailed description of graph nodes. A Computer-Aided Software Engineering tool developed at the Charles Stark Draper Laboratory (CSDL CASE) automatically generates Ada or C code from engineering block diagram specifications designed with an interactive graphical interface. A technique to use the tools together has been developed, which further automates the design process.

  4. Design of radial basis function neural network classifier realized with the aid of data preprocessing techniques: design and analysis

    Science.gov (United States)

    Oh, Sung-Kwun; Kim, Wook-Dong; Pedrycz, Witold

    2016-05-01

    In this paper, we introduce a new architecture of optimized Radial Basis Function neural network classifier developed with the aid of fuzzy clustering and data preprocessing techniques and discuss its comprehensive design methodology. In the preprocessing part, the Linear Discriminant Analysis (LDA) or Principal Component Analysis (PCA) algorithm forms a front end of the network. The transformed data produced here are used as the inputs of the network. In the premise part, the Fuzzy C-Means (FCM) algorithm determines the receptive field associated with the condition part of the rules. The connection weights of the classifier are of functional nature and come as polynomial functions forming the consequent part. The Particle Swarm Optimization algorithm optimizes a number of essential parameters needed to improve the accuracy of the classifier. Those optimized parameters include the type of data preprocessing, the dimensionality of the feature vectors produced by the LDA (or PCA), the number of clusters (rules), the fuzzification coefficient used in the FCM algorithm and the orders of the polynomials of networks. The performance of the proposed classifier is reported for several benchmarking data-sets and is compared with the performance of other classifiers reported in the previous studies.

  5. Computer Aided Control System Design (CACSD)

    Science.gov (United States)

    Stoner, Frank T.

    1993-01-01

    The design of modern aerospace systems relies on the efficient utilization of computational resources and the availability of computational tools to provide accurate system modeling. This research focuses on the development of a computer aided control system design application which provides a full range of stability analysis and control design capabilities for aerospace vehicles.

  6. Estimation and Uncertainty Analysis of Flammability Properties for Computer-aided molecular design of working fluids for thermodynamic cycles

    DEFF Research Database (Denmark)

    Frutiger, Jerome; Abildskov, Jens; Sin, Gürkan

    Computer Aided Molecular Design (CAMD) is an important tool to generate, test and evaluate promising chemical products. CAMD can be used in thermodynamic cycle for the design of pure component or mixture working fluids in order to improve the heat transfer capacity of the system. The safety...... analysis. In this case property prediction models like group contribution (GC) models can estimate flammability data. The estimation needs to be accurate, reliable and as less time consuming as possible [1]. However, GC property prediction methods frequently lack rigorous uncertainty analysis. Hence, there...

  7. Computer aided airship design

    Science.gov (United States)

    Davis, S. J.; Rosenstein, H.

    1975-01-01

    The Comprehensive Airship Sizing and Performance Computer Program (CASCOMP) is described which was developed and used in the design and evaluation of advanced lighter-than-air (LTA) craft. The program defines design details such as engine size and number, component weight buildups, required power, and the physical dimensions of airships which are designed to meet specified mission requirements. The program is used in a comparative parametric evaluation of six advanced lighter-than-air concepts. The results indicate that fully buoyant conventional airships have the lightest gross lift required when designed for speeds less than 100 knots and the partially buoyant concepts are superior above 100 knots. When compared on the basis of specific productivity, which is a measure of the direct operating cost, the partially buoyant lifting body/tilting prop-rotor concept is optimum.

  8. Computer-Aided Design (CAD).

    Science.gov (United States)

    Burns, William E.

    1986-01-01

    Discusses the field of computer-aided design, which combines the skills and creativity of the architect, designer, drafter, and engineer with the power of the computer. Reports on job tasks, applications, background of the field, job outlook, and necessary training. (CH)

  9. Statistical Shape Analysis of the Human Ear Canal with Application to In-the-Ear Hearing Aid Design

    DEFF Research Database (Denmark)

    Paulsen, Rasmus Reinhold

    2004-01-01

    This thesis is about the statistical shape analysis of the human ear canal with application to the mechanical design of in-the-ear hearing aids. Initially, it is described how a statistical shape model of the human ear canal is built based on a training set of laser-scanned ear impressions. A thin......-the-ear hearing aids. In addition, the idea of one-size-fits-most shells is explored. In Danish: Denne afhandling beskriver brugen af statistisk formanalyse af den menneskelige hørekanal i det mekaniske design af i-øret høreapparater. Først beskrives det hvordan en statistisk formmodel af den menneskelige øre...

  10. Computer aided safety analysis

    International Nuclear Information System (INIS)

    The document reproduces 20 selected papers from the 38 papers presented at the Technical Committee/Workshop on Computer Aided Safety Analysis organized by the IAEA in co-operation with the Institute of Atomic Energy in Otwock-Swierk, Poland on 25-29 May 1987. A separate abstract was prepared for each of these 20 technical papers. Refs, figs and tabs

  11. Echelle spectrograph software design aid

    Science.gov (United States)

    Dantzler, A. A.

    1985-01-01

    A method for mapping, to first order, the spectrograms that result from echelle spectrographic systems is discussed. An in-depth description of the principles behind the method are given so that software may be generated. Such software is an invaluable echelle spectrograph design aid. Results from two applications are discussed.

  12. A Design of a Computer-Aided Diagnostic Tool For Chest X-Ray Analysis

    Directory of Open Access Journals (Sweden)

    Kim Le

    2011-04-01

    Full Text Available Diagnosis of some chest diseases like heart failure, lung cancer or lung tuberculosis, etc. isoften based on chest X-ray images (CXR. The diseases are curable if they are detected in theirearly stages. Examining CXR is a time consuming process. In some cases, medical experts hadoverlooked the diseases in their firstexaminations on CXR, and when the images were reexamined,the disease signs could be detected.Furthermore, the number of CXR to examine isnumerous and far beyond the capability of available medical staff, especially in developingcountries.A computer-aided diagnosis (CAD system can mark suspected areas on CXR for carefulexamination by medical doctors, and can give alarm in the cases that need urgent attention.This paper reports our continuous work on the development of a CAD tool, which is anextended version of a conference paper [1]. In this version, we present some more works onCXR analysis and examination.

  13. The Computer Aided Integrated Design and Analysis of Oil Tank in Vehicle

    Institute of Scientific and Technical Information of China (English)

    2002-01-01

    This paper creates 3D solid model and assembly of U RJ 92-6 oil tank and analyses its strength by integrated CAD/CAE/CAM software I-D EAS. Through integrated simulation in computer, design efficiency and quality of oil tank is greatly improved. Adopting integrated CAD/CAE/CAM software to carry out integrated research to equ ipment and products, we will be able to take overall analysis in aspects of 3-D solid modeling, pre-assembly and strength, etc., to realize non-paper designi ng and parallel designing...

  14. Sensitivity analysis of Computer-aided molecular design problem for the development of novel working fluids for power cycles

    DEFF Research Database (Denmark)

    Frutiger, Jerome; Abildskov, Jens; Sin, Gürkan

    is vital. Multi-criteria database search and Computer Aided Molecular Design(CAMD) can be applied to generate, test and evaluate promising pure component/mixture candidate as process fluids to help optimize cycle design and performance. The problem formulation for the development of novel working...... technical tool to convert this waste heat into usable energy. So far the low-temperature heat cannot be utilized efficiently for electricity generation.In order to optimize the heat transfer process and the power generation, the influence of the working fluid, the cycledesigns and the operating conditions......, in this study, we propose the use of sensitivity analysis. The sensitivity analysis, among others,provides using information concerning the influence of a certain property of a candidate working fluid on the performanceof the power cycle, i.e. the net power output in this particular application. This...

  15. Computer Aided Design and Stress Analysis of Nose Landing Gear Barrel (NLGB

    Directory of Open Access Journals (Sweden)

    Sanjay Kumar Sardiwal

    2015-04-01

    Full Text Available During the conceptual design phase of aircraft the integration of undercarriage system is very important and it is often difficult to achieve on the first time. The nose wheel landing gear preferred configurations for light naval trainer aircraft. The main objective of this project is to improve the static strength criteria and fatigue life of Nose Landing Gear Barrel considered. The investigations includes preliminary design layout for Nose Landing Gear Barrel and initial sizing has been done. It has been designed and evaluated for strength criteria. A method of analysis for the design of Nose Landing Gear Barrel made up of Al-Cu alloy (BS L 168 T6511 with static loads of axial, bending and normal loads are applied. The geometric modeling of the Nose Landing Gear Barrel was carried out using CAD package CATIA V5 R19 and pre and post processing was done through MSC/PATRAN. The stresses and displacements are obtained with the application of MSC/NASTRAN finite element software.

  16. Computer-Aided Modelling of Short-Path Evaporation for Chemical Product Purification, Analysis and Design

    DEFF Research Database (Denmark)

    Sales-Cruz, Alfonso Mauricio; Gani, Rafiqul

    2006-01-01

    An important stage in the design process for many chemical products is its manufacture where, for a class of chemical products that may be thermally unstable (such as, drugs, insecticides, flavours /fragrances, and so on), the purification step plays a major role. Short-path evaporation is a safe...... method, suitable for separation and purification of thermally unstable materials whose design and analysis can be efficiently performed through reliable model-based techniques. This paper presents a generalized model for short-path evaporation and highlights its development, implementation and solution...... glycerol, mono-, di- and triglycerides, and (b) the recovery of a pharmaceutical product from a six-component mixture. Validation of the short-path evaporation model is highlighted through the comparison of experimental data from an industrial pilot plant with the simulated results from the model. Also...

  17. Modified optimal control pilot model for computer-aided design and analysis

    Science.gov (United States)

    Davidson, John B.; Schmidt, David K.

    1992-01-01

    This paper presents the theoretical development of a modified optimal control pilot model based upon the optimal control model (OCM) of the human operator developed by Kleinman, Baron, and Levison. This model is input compatible with the OCM and retains other key aspects of the OCM, such as a linear quadratic solution for the pilot gains with inclusion of control rate in the cost function, a Kalman estimator, and the ability to account for attention allocation and perception threshold effects. An algorithm designed for each implementation in current dynamic systems analysis and design software is presented. Example results based upon the analysis of a tracking task using three basic dynamic systems are compared with measured results and with similar analyses performed with the OCM and two previously proposed simplified optimal pilot models. The pilot frequency responses and error statistics obtained with this modified optimal control model are shown to compare more favorably to the measured experimental results than the other previously proposed simplified models evaluated.

  18. Computer aided analysis and design of industrial energy systems; Rechnergestuetzte Analyse und Konzeption industrieller Energiesysteme

    Energy Technology Data Exchange (ETDEWEB)

    Augenstein, Eckardt Marc Guenter

    2009-03-02

    In this dissertation the concept and implementation of a software system supporting the analysis and the design of industrial energy systems is presented. As a basis, a software framework was designed supplying a domain specific object model allowing the description of energy systems as well as the energy auditing projects performed with the software. Moreover, a set of graphical and textual editors needed to model the examined systems is part of the framework. On the other hand, the professional methods for analysis, assessment and optimization of energy systems are implemented in modules integrated into the system via a plug-in interface. The object model whose definition was based on a meta model approach allows the description of network like structures typical to energy systems. In order to keep track of the different work steps performed during an analysis project, these steps are reflected in the object model as ''method applications'' using a tree as the basic structure of a project. In order to allow the compatibility of information a set of conventions for the evaluation of energy flows and system balances was introduced. Moreover, all data elements used in modules or model components are derived from a central database guaranteeing a consistent usage of terms, descriptions, validity ranges and data types. The single professional modules like simulators or optimization methods access the object model via an appropriate software interface. Moreover, they make use of the framework's user interface engine by delivering a generic description of dialog screens and result reports. As all modules share the same set of objects modelling the components of the energy system surveyed, the flow of information from module to module can be designed virtually seamless. Compared to a number of stand-alone solutions, this integrated design approach has the advantage that by combining a set of specialized methods an overall solution for complex

  19. Analysis, Design, and Evaluation of Acoustic Feedback Cancellation Systems for Hearing Aids

    DEFF Research Database (Denmark)

    Guo, Meng

    2013-01-01

    Acoustic feedback problems occur when the output loudspeaker signal of an audio system is partly returned to the input microphone via an acoustic coupling through the air. This problem often causes significant performance degradations in applications such as public address systems and hearing aids....... In the worst case, the audio system becomes unstable and howling occurs. In this work, first we analyze a general multiple microphone audio processing system, where a cancellation system using adaptive filters is used to cancel the effect of acoustic feedback. We introduce and derive an accurate...... estimation problem in acoustic feedback cancellation for hearing aids. It utilizes a probe noise signal which is generated with a specific characteristic so that it can facilitate an unbiased adaptive filter estimation with fast tracking of feedback path variations/changes despite its low signal level. We...

  20. Computer aided analysis and design of industrial energy systems; Rechnergestuetzte Analyse und Konzeption industrieller Energiesysteme

    Energy Technology Data Exchange (ETDEWEB)

    Augenstein, Eckardt Marc Guenter

    2009-03-02

    In this dissertation the concept and implementation of a software system supporting the analysis and the design of industrial energy systems is presented. As a basis, a software framework was designed supplying a domain specific object model allowing the description of energy systems as well as the energy auditing projects performed with the software. Moreover, a set of graphical and textual editors needed to model the examined systems is part of the framework. On the other hand, the professional methods for analysis, assessment and optimization of energy systems are implemented in modules integrated into the system via a plug-in interface. The object model whose definition was based on a meta model approach allows the description of network like structures typical to energy systems. In order to keep track of the different work steps performed during an analysis project, these steps are reflected in the object model as ''method applications'' using a tree as the basic structure of a project. In order to allow the compatibility of information a set of conventions for the evaluation of energy flows and system balances was introduced. Moreover, all data elements used in modules or model components are derived from a central database guaranteeing a consistent usage of terms, descriptions, validity ranges and data types. The single professional modules like simulators or optimization methods access the object model via an appropriate software interface. Moreover, they make use of the framework's user interface engine by delivering a generic description of dialog screens and result reports. As all modules share the same set of objects modelling the components of the energy system surveyed, the flow of information from module to module can be designed virtually seamless. Compared to a number of stand-alone solutions, this integrated design approach has the advantage that by combining a set of specialized methods an overall solution for complex

  1. Geometric modeling for computer aided design

    Science.gov (United States)

    Schwing, James L.; Olariu, Stephen

    1995-01-01

    The primary goal of this grant has been the design and implementation of software to be used in the conceptual design of aerospace vehicles particularly focused on the elements of geometric design, graphical user interfaces, and the interaction of the multitude of software typically used in this engineering environment. This has resulted in the development of several analysis packages and design studies. These include two major software systems currently used in the conceptual level design of aerospace vehicles. These tools are SMART, the Solid Modeling Aerospace Research Tool, and EASIE, the Environment for Software Integration and Execution. Additional software tools were designed and implemented to address the needs of the engineer working in the conceptual design environment. SMART provides conceptual designers with a rapid prototyping capability and several engineering analysis capabilities. In addition, SMART has a carefully engineered user interface that makes it easy to learn and use. Finally, a number of specialty characteristics have been built into SMART which allow it to be used efficiently as a front end geometry processor for other analysis packages. EASIE provides a set of interactive utilities that simplify the task of building and executing computer aided design systems consisting of diverse, stand-alone, analysis codes. Resulting in a streamlining of the exchange of data between programs reducing errors and improving the efficiency. EASIE provides both a methodology and a collection of software tools to ease the task of coordinating engineering design and analysis codes.

  2. Computer aided design, analysis and experimental investigation of membrane assisted batch reaction-separation systems

    DEFF Research Database (Denmark)

    Mitkowski, Piotr Tomasz; Buchaly, Carsten; Kreis, Peter; Jonsson, Gunnar Eigil; Gorak, Andrzej; Gani, Rafiqul

    2009-01-01

    Membrane assisted batch reaction operation offers an interesting option for equilibrium limited reaction systems in chemical and biochemical manufacturing by selective removal of one of the products and thereby increasing the product yield. The design of such hybrid systems need to take into...... account the performance of each constituent element and the optimisation of the design must take into consideration their interdependency. In this paper use of a membrane, to assist in the synthesis of propyl-propionate is investigated through the use of a hybrid process design framework, which consists...... and separation functionalities and to design/analyse the hybrid scheme. The generated hybrid scheme has been validated through experiments involving an esterification reaction....

  3. Computer Aided Design and Stress Analysis of Nose Landing Gear Barrel (NLGB)

    OpenAIRE

    Sanjay Kumar Sardiwal; D. Harika Chowdary

    2015-01-01

    During the conceptual design phase of aircraft the integration of undercarriage system is very important and it is often difficult to achieve on the first time. The nose wheel landing gear preferred configurations for light naval trainer aircraft. The main objective of this project is to improve the static strength criteria and fatigue life of Nose Landing Gear Barrel considered. The investigations includes preliminary design layout for Nose Landing Gear Barrel and initial sizing ...

  4. An Ontology-based approach to integrating life cycle analysis and computer aided design

    OpenAIRE

    Abad Kelly, Jessica; Cebrián Tarrasón, David; Chulvi Ramos, Vicente

    2008-01-01

    Ponencia presentada en el XII Congreso Internacional de Ingeniería de Proyectos celebrado en Zaragoza en el año 2008 One of the principal problems faced by engineering design today is the exchange of product information across different applications and environments. Ontological engineering systems, an evolution of KBE (Knowledge-Based Engineering) systems, seek to facilitate this integration while incorporating additional design information. An ontology, in the engineering dom...

  5. A dc model for power switching transistors suitable for computer-aided design and analysis

    Science.gov (United States)

    Wilson, P. M.; George, R. T., Jr.; Owen, H. A., Jr.; Wilson, T. G.

    1979-01-01

    The proposed dc model for bipolar junction power switching transistors is based on measurements which may be made with standard laboratory equipment. Those nonlinearities which are of importance to power electronics design are emphasized. Measurements procedures are discussed in detail. A model formulation adapted for use with a computer program is presented, and a comparison between actual and computer-generated results is made.

  6. User Centered Design as a Framework for Applying Conversation Analysis in Hearing Aid Consultations

    DEFF Research Database (Denmark)

    Egbert, Maria; Matthews, Ben

    2011-01-01

    Recurrent issues in applying CA results to change in institutional practices concern the degree to which the CA researcher is involved and what aspects of the change process CA researchers is involved in. This paper presents a methodology from innovation studies called User Centered Design (Buur...... for innovation. Although this methodological convergence of disciplines is rooted in different traditions, it augurs well for successful cooperation. This paper reports on such a collaboration carried out within a federally funded research center for innovation. We present principles of the...

  7. An Analysis of Computer Aided Design (CAD) Packages Used at MSFC for the Recent Initiative to Integrate Engineering Activities

    Science.gov (United States)

    Smith, Leigh M.; Parker, Nelson C. (Technical Monitor)

    2002-01-01

    This paper analyzes the use of Computer Aided Design (CAD) packages at NASA's Marshall Space Flight Center (MSFC). It examines the effectiveness of recent efforts to standardize CAD practices across MSFC engineering activities. An assessment of the roles played by management, designers, analysts, and manufacturers in this initiative will be explored. Finally, solutions are presented for better integration of CAD across MSFC in the future.

  8. Computer-aided design analysis of 57-mm, angular-contact, cryogenic turbopump bearings

    Science.gov (United States)

    Armstrong, Elizabeth S.; Coe, Harold H.

    1988-01-01

    The Space Shuttle main engine high-pressure oxygen turbopumps have not experienced the sevice life required of them. This insufficiency has been due in part to the shortened life of the bearings. To improve the life of the existing turbopump bearings, an effort is under way to investigate bearing modifications that could be retrofitted into the present bearing cavity. Several bearing parameters were optimized using the computer program SHABERTH, which performs a thermomechanical simulation of a load support system. The computer analysis showed that improved bearing performance is feasible if low friction coefficients can be attained. Bearing geometries were optimized considering heat generation, equilibrium temperatures, and relative life. Thermal gradients through the bearings were found to be lower with liquid lubrication than with solid film lubrication, and a liquid oxygen coolant flowrate of approximately 4.0 kg/s was found to be optimal. This paper describes the analytical modeling used to determine these feasible modifications to improve bearing performance.

  9. Integrated computer-aided design using minicomputers

    Science.gov (United States)

    Storaasli, O. O.

    1980-01-01

    Computer-Aided Design/Computer-Aided Manufacturing (CAD/CAM), a highly interactive software, has been implemented on minicomputers at the NASA Langley Research Center. CAD/CAM software integrates many formerly fragmented programs and procedures into one cohesive system; it also includes finite element modeling and analysis, and has been interfaced via a computer network to a relational data base management system and offline plotting devices on mainframe computers. The CAD/CAM software system requires interactive graphics terminals operating at a minimum of 4800 bits/sec transfer rate to a computer. The system is portable and introduces 'interactive graphics', which permits the creation and modification of models interactively. The CAD/CAM system has already produced designs for a large area space platform, a national transonic facility fan blade, and a laminar flow control wind tunnel model. Besides the design/drafting element analysis capability, CAD/CAM provides options to produce an automatic program tooling code to drive a numerically controlled (N/C) machine. Reductions in time for design, engineering, drawing, finite element modeling, and N/C machining will benefit productivity through reduced costs, fewer errors, and a wider range of configuration.

  10. Challenges in IC design for hearing aids

    DEFF Research Database (Denmark)

    Jørgensen, Ivan Harald Holger

    2012-01-01

    Designing modern hearing aids is a formidable challenge. The size of hearing aids is constantly decreasing, making them virtually invisible today. Still, as in all other modern electronics, more and more features are added to these devices driven by the development in modern IC technology. The...... demands for performance and features at very low supply voltage and power consumption constantly prove a challenge to the physical design of hearing aids and not at least the design of the ICs for these. As a result of this all large hearing aid manufacturers use fully customized ASICs in their products...... to produce a competitive advantage. This presentation will give a brief insight into the hearing aid market and industry, a brief view of the historic development of hearing aids and an introduction to how a modern hearing is constructed showing the amplifier as the key component in the modern...

  11. Domain specific software design for decision aiding

    Science.gov (United States)

    Keller, Kirby; Stanley, Kevin

    1992-01-01

    McDonnell Aircraft Company (MCAIR) is involved in many large multi-discipline design and development efforts of tactical aircraft. These involve a number of design disciplines that must be coordinated to produce an integrated design and a successful product. Our interpretation of a domain specific software design (DSSD) is that of a representation or framework that is specialized to support a limited problem domain. A DSSD is an abstract software design that is shaped by the problem characteristics. This parallels the theme of object-oriented analysis and design of letting the problem model directly drive the design. The DSSD concept extends the notion of software reusability to include representations or frameworks. It supports the entire software life cycle and specifically leads to improved prototyping capability, supports system integration, and promotes reuse of software designs and supporting frameworks. The example presented in this paper is the task network architecture or design which was developed for the MCAIR Pilot's Associate program. The task network concept supported both module development and system integration within the domain of operator decision aiding. It is presented as an instance where a software design exhibited many of the attributes associated with DSSD concept.

  12. STRATEGY FOR IMPROVEMENT OF SAFETY AND EFFICIENCY OF COMPUTER-AIDED DESIGN ANALYSIS OF CIVIL ENGINEERING STRUCTURES ON THE BASIS OF THE SYSTEM APPROACH

    OpenAIRE

    Zaikin Vladimir Genrikhovich; Valuyskikh Viktor Petrovich

    2012-01-01

    The authors highlight three problems of the age of information technologies and proposes the strategy for their resolution in relation to the computer-aided design of civil engineering structures. The authors express their concerns in respect of globalization of software programmes designated for the analysis of civil engineering structures and employed outside of Russia. The problem of the poor quality of the input data has reached Russia. Lately, the rate of accidents of buildings and s...

  13. Fatigue analysis of computer-aided design/computer-aided manufacturing resin-based composite vs. lithium disilicate glass-ceramic.

    Science.gov (United States)

    Ankyu, Shuhei; Nakamura, Keisuke; Harada, Akio; Hong, Guang; Kanno, Taro; Niwano, Yoshimi; Örtengren, Ulf; Egusa, Hiroshi

    2016-08-01

    Resin-based composite molar crowns made by computer-aided design/computer-aided manufacturing (CAD/CAM) systems have been proposed as an inexpensive alternative to metal-ceramic or all-ceramic crowns. However, there is a lack of scientific information regarding fatigue resistance. This study aimed to analyze the fatigue behavior of CAD/CAM resin-based composite compared with lithium disilicate glass-ceramic. One-hundred and sixty bar-shaped specimens were fabricated using resin-based composite blocks [Lava Ultimate (LU); 3M/ESPE] and lithium disilicate glass-ceramic [IPS e.max press (EMP); Ivoclar/Vivadent]. The specimens were divided into four groups: no treatment (NT); thermal cycling (TC); mechanical cycling (MC); and thermal cycling followed by mechanical cycling (TCMC). Thermal cycling was performed by alternate immersion in water baths of 5°C and 55°C for 5 × 10(4) cycles. Mechanical cycling was performed in a three-point bending test, with a maximum load of 40 N, for 1.2 × 10(6) cycles. In addition, LU and EMP molar crowns were fabricated and subjected to fatigue treatments followed by load-to-failure testing. The flexural strength of LU was not severely reduced by the fatigue treatments. The fatigue treatments did not significantly affect the fracture resistance of LU molar crowns. The results demonstrate the potential of clinical application of CAD/CAM-generated resin-based composite molar crowns in terms of fatigue resistance. PMID:27203408

  14. Computer Aided Design in Engineering Education.

    Science.gov (United States)

    Gobin, R.

    1986-01-01

    Discusses the use of Computer Aided Design (CAD) and Computer Aided Manufacturing (CAM) systems in an undergraduate engineering education program. Provides a rationale for CAD/CAM use in the already existing engineering program. Describes the methods used in choosing the systems, some initial results, and warnings for first-time users. (TW)

  15. Purchasing Computer-Aided Design Software.

    Science.gov (United States)

    Smith, Roger A.

    1992-01-01

    Presents a model for the purchase of computer-aided design (CAD) software: collect general information, observe CAD in use, arrange onsite demonstrations, select CAD software and hardware, and choose a vendor. (JOW)

  16. STRATEGY FOR IMPROVEMENT OF SAFETY AND EFFICIENCY OF COMPUTER-AIDED DESIGN ANALYSIS OF CIVIL ENGINEERING STRUCTURES ON THE BASIS OF THE SYSTEM APPROACH

    Directory of Open Access Journals (Sweden)

    Zaikin Vladimir Genrikhovich

    2012-12-01

    Full Text Available The authors highlight three problems of the age of information technologies and proposes the strategy for their resolution in relation to the computer-aided design of civil engineering structures. The authors express their concerns in respect of globalization of software programmes designated for the analysis of civil engineering structures and employed outside of Russia. The problem of the poor quality of the input data has reached Russia. Lately, the rate of accidents of buildings and structures has been growing not only in Russia. Control over efficiency of design projects is hardly performed. This attitude should be changed. Development and introduction of CAD along with the application the efficient methods of projection of behaviour of building structures are in demand. Computer-aided calculations have the function of a logical nucleus, and they need proper control. The system approach to computer-aided calculations and technologies designated for the projection of accidents is formulated by the authors. Two tasks of the system approach and fundamentals of the strategy for its implementation are formulated. The study of cases of negative results of computer-aided design of engineering structures was performed and multi-component design patterns were developed. Conclusions concerning the results of researches aimed at regular and wide-scale implementation of the strategy fundamentals are formulated. Organizational and innovative actions concerning the projected behaviour of civil engineering structures proposed in the strategy are to facilitate: safety and reliability improvement of buildings and structures; saving of building materials and resources; improvement of labour efficiency of designers; modernization and improvement of accuracy of projected behaviour of buildings and building standards; closer ties between civil and building engineering researchers and construction companies; development of competitive environment to boost

  17. Logic modelling in computer-aided design

    OpenAIRE

    Bijl, A.

    1986-01-01

    Research into a generalized logic modelling system linked to machine interpretation of drawings and text is described. This work is related to a view of design and builds on experience of working integrated design systems. Questions are posed for future computer-aided design systems.

  18. User interface for integrated computer aided design systems

    Science.gov (United States)

    Schwing, James L.

    1986-01-01

    The purpose was the development of a user interface and other appropriate tools to be used in Computer Aided Design systems which can integrate a wide variety of independently developed design and analysis tools. The interface was intended for the integration of programs to be used in the conceptual design of aerospace systems. A user's manual is included.

  19. Computer-Aided Business Model Design

    OpenAIRE

    Fritscher B.

    2014-01-01

    There is a lack of dedicated tools for business model design at a strategic level. However, in today's economic world the need to be able to quickly reinvent a company's business model is essential to stay competitive. This research focused on identifying the functionalities that are necessary in a computer-aided design (CAD) tool for the design of business models in a strategic context. Using design science research methodology a series of techniques and prototypes have been designed and eva...

  20. Computer Aided Solvent Selection and Design Framework

    DEFF Research Database (Denmark)

    Mitrofanov, Igor; Conte, Elisa; Abildskov, Jens;

    computer-aided tools and methods for property prediction and computer-aided molecular design (CAMD) principles. This framework is applicable for solvent selection and design in product design as well as process design. The first module of the framework is dedicated to the solvent selection and design for...... in terms of: physical and chemical properties (solvent-pure properties); Environment, Health and Safety (EHS) characteristic (solvent-EHS properties); operational properties (solvent–solute properties). 3. Performing the search. The search step consists of two stages. The first is a generation and...... property identification of solvent candidates using special software ProCAMD and ProPred, which are the implementations of computer-aided molecular techniques. The second consists of assigning the RS-indices following the reaction–solvent and then consulting the known solvent database and identifying the...

  1. Scaled Ellipses For Computer-Aided Design

    Science.gov (United States)

    Schembri, Anthony J.

    1990-01-01

    An addition to CAD-PACK, computer-aided design program, speeds preparation of iosmetric drawings, particularly cutaway views showing bores and threads. Consists of set of 50 scaled ellipses on detail pages of program. Designer selects ellipse, rotates it, and draws feature. Then erases reference lines on video screen.

  2. A rule based computer aided design system

    Science.gov (United States)

    Premack, T.

    1986-01-01

    A Computer Aided Design (CAD) system is presented which supports the iterative process of design, the dimensional continuity between mating parts, and the hierarchical structure of the parts in their assembled configuration. Prolog, an interactive logic programming language, is used to represent and interpret the data base. The solid geometry representing the parts is defined in parameterized form using the swept volume method. The system is demonstrated with a design of a spring piston.

  3. Approach to integrate product conceptual design information into a computer-aided design system

    OpenAIRE

    Torres Macias, Victor H.; Ríos Chueco, José; Vizán Idoipe, Antonio; Pérez García, Jesus Maria

    2013-01-01

    Commercial computer-aided design systems support the geometric definition of product, but they lack utilities to support initial design stages. Typical tasks such as customer need capture, functional requirement formalization, or design parameter definition are conducted in applications that, for instance, support ?quality function deployment? and ?failure modes and effects analysis? techniques. Such applications are noninteroperable with the computer-aided design systems, leading to disconti...

  4. Genetic algorithms in computer aided inductor design

    Directory of Open Access Journals (Sweden)

    Jean Fivaz

    2004-09-01

    Full Text Available The goal of this investigation is to determine the advantages of using genetic algorithms in computer-aided design as applied to inductors.  These advantages are exploited in design problems with a number of specifications and constraints, as encountered in power electronics during practical inductor design. The design tool should be able to select components, such as cores and wires, from databases of available components, and evaluate these choices based on the components’ characteristic data read from a database of manufacturers’ data-sheets.  The proposed design must always be practically realizable, as close to the desired specifications as possible and within any specified constraints.

  5. Computer-Aided Design for Electron Microscopy

    Czech Academy of Sciences Publication Activity Database

    Lencová, Bohumila

    2004-01-01

    Roč. 6, č. 1 (2004), s. 51-53. ISSN 1439-4243 Institutional research plan: CEZ:AV0Z2065902 Keywords : magnetic electron lenses * accuracy of computation * computer - aided design Subject RIV: JA - Electronics ; Optoelectronics, Electrical Engineering

  6. COMPUTER AIDED DESIGN OF DIFFUSED AERATION SYSTEMS

    Science.gov (United States)

    CADDAS (Computer Aided Design of Diffused Aeration Systems) is a microcomputer-based program that analyzes the cost and performance of diffused aeration used in activated sludge wastewater treatment systems. The program can analyze both coarse bubble and fine pore diffusers as we...

  7. Teaching Computer Aided Architectural Design at UCLA.

    Science.gov (United States)

    Mitchell, William J.

    This brief overview includes a rationale for the program and describes course goals and objectives, curriculum content, teaching methods and materials, staffing, and problems of integrating computer aided design with traditional architectural curricula at the School of Architecture and Urban Planning at UCLA. A list of texts for use in teaching…

  8. An Aided Tool for Enterprise Network Design

    Institute of Scientific and Technical Information of China (English)

    冯径; 马小骏; 顾伯萱; 顾冠群

    2000-01-01

    With the rapid development of network technologies, it is necessary to make use of an aided tool (AT) to help enterprise network design (END). The AT must process many requirements qualitatively and quantitatively, and then give out the logical network guidance and preferred solution. The AT also needs to carry out a simulation program, and gives the feasibility report. This paper will introduce the authors' research work on above aspects.

  9. Computer aided safety analysis 1989

    International Nuclear Information System (INIS)

    The meeting was conducted in a workshop style, to encourage involvement of all participants during the discussions. Forty-five (45) experts from 19 countries, plus 22 experts from the GDR participated in the meeting. A list of participants can be found at the end of this volume. Forty-two (42) papers were presented and discussed during the meeting. Additionally an open discussion was held on the possible directions of the IAEA programme on Computer Aided Safety Analysis. A summary of the conclusions of these discussions is presented in the publication. The remainder of this proceedings volume comprises the transcript of selected technical papers (22) presented in the meeting. It is the intention of the IAEA that the publication of these proceedings will extend the benefits of the discussions held during the meeting to a larger audience throughout the world. The Technical Committee/Workshop on Computer Aided Safety Analysis was organized by the IAEA in cooperation with the National Board for Safety and Radiological Protection (SAAS) of the German Democratic Republic in Berlin. The purpose of the meeting was to provide an opportunity for discussions on experiences in the use of computer codes used for safety analysis of nuclear power plants. In particular it was intended to provide a forum for exchange of information among experts using computer codes for safety analysis under the Technical Cooperation Programme on Safety of WWER Type Reactors (RER/9/004) and other experts throughout the world. A separate abstract was prepared for each of the 22 selected papers. Refs, figs tabs and pictures

  10. Integrating reliability analysis and design

    International Nuclear Information System (INIS)

    This report describes the Interactive Reliability Analysis Project and demonstrates the advantages of using computer-aided design systems (CADS) in reliability analysis. Common cause failure problems require presentations of systems, analysis of fault trees, and evaluation of solutions to these. Results have to be communicated between the reliability analyst and the system designer. Using a computer-aided design system saves time and money in the analysis of design. Computer-aided design systems lend themselves to cable routing, valve and switch lists, pipe routing, and other component studies. At EG and G Idaho, Inc., the Applicon CADS is being applied to the study of water reactor safety systems

  11. COMPUTER AIDED DESIGN OF CUTTING TOOLS

    Directory of Open Access Journals (Sweden)

    Jakub Matuszak

    2015-11-01

    Full Text Available Correct and stable machining process requires an appropriate cutting tool. In most cases the tool can be selected by using special tool catalogs often available in online version. But in some cases there is a need to design unusual tools, for special treatment, which are not available in tool manufacturers’ catalogs. Proper tool design requires strength and geometric calculations. Moreover, in many cases specific technical documentation is required. By using Computer Aided Design of cutting tools this task can be carried out quickly and with high accuracy. Cutting tool visualization in CAD programs gives a clear overview of the design process. Besides, these programs provide the ability to simulate real machining process. Nowadays, 3D modeling in CAD programs is a fundamental tool for engineers. Therefore, it is important to use them in the education process.

  12. Architectural design exposed: from computer-aided drawing to computer-aided design

    OpenAIRE

    RUFFLE, S

    1986-01-01

    Computer programs for architects and designers still do not 'understand' very much about what they are modelling or representing. In this paper the argument is put forward that as computer-aided design systems show increasing intelligence by employing data structures that more closely represent the way buildings go together, designers will find that they are relieved of manual tasks of representing the building design. This will be achieved by some restriction on the range of possible buildin...

  13. Using a Shape Model in the Design of Hearing Aids

    DEFF Research Database (Denmark)

    Paulsen, Rasmus Reinhold; Nielsen, Claus; Laugesen, Søren;

    2004-01-01

    Today the design of custom completely-in-the-canal hearing aids is a manual process and therefore there is a variation in the quality of the finished hearing aids. Especially the placement of the so-called faceplate on the hearing aid strongly influences the size and shape of the hearing aid. Since...

  14. Physiological modeling for hearing aid design

    Science.gov (United States)

    Bruce, Ian C.; Young, Eric D.; Sachs, Murray B.

    2002-05-01

    Physiological data from hearing-impaired cats suggest that conventional hearing aid signal-processing schemes do not restore normal auditory-nerve responses to a vowel [Miller et al., J. Acoust. Soc. Am. 101, 3602 (1997)] and can even produce anomalous and potentially confounding patterns of activity [Schilling et al., Hear. Res. 117, 57 (1998)]. These deficits in the neural representation may account at least partially for poor speech perception in some hearing aid users. An amplification scheme has been developed that produces neural responses to a vowel more like those seen in normal cats and that reduces confounding responses [Miller et al., J. Acoust. Soc. Am. 106, 2693 (1999)]. A physiologically accurate model of the normal and impaired auditory periphery would provide simpler and quicker testing of such potential hearing aid designs. Details of such a model, based on that of Zhang et al. [J. Acoust. Soc. Am. 109, 648 (2001)], will be presented. Model predictions suggest that impairment of both outer- and inner-hair cells contribute to the degraded representation of vowels in hearing-impaired cats. The model is currently being used to develop and test a generalization of the Miller et al. speech-processing algorithm described above to running speech. [Work supported by NIDCD Grants DC00109 and DC00023.] a)Now with the Dept. of Electrical and Computer Engineering, McMaster Univ., 1280 Main St. W., Hamilton, ON L8S 4K1, Canada.

  15. Computer Aided Aerodynamic Design of Missile Configuration

    Directory of Open Access Journals (Sweden)

    S. Panneerselvam

    1987-10-01

    Full Text Available Aerodynamic configurations of tactical missiles have to produce the required lateral force with minimum time lag to meet the required manoeuvability and response time. The present design which is mainly based on linearised potential flow involves (a indentification of critical design points, (b design of lifting components and their integration with mutual interference, (c evaluation of aerodynamic characteristics, (d checking its adequacy at otherpoints, (e optimization of parameters and selection of configuration, and (f detailed evaluation including aerodynamic pressure distribution. Iterative design process in involed because of the mutual dependance between aerodynamic charactertistics and the parameters of the configuration. though this design method is based on third level of approximation with respect to real flow, aid of computer is essential for carrying out the iterative design process and also for effective selection of configuration by analysing performance. Futuristic design requirement which demand better accuracy on design and estimation calls for sophisticated super computer based theoretical methods viz. , full Euler solution/Navier-Strokes solutions.

  16. Computer Aided Design Modeling for Heterogeneous Objects

    Directory of Open Access Journals (Sweden)

    Vikas Gupta

    2010-03-01

    Full Text Available Heterogeneous object design is an active research area in recent years. The conventional CAD modeling approaches only provide geometry and topology of the object, but do not contain any information with regard to the materials of the object and so can not be used for the fabrication of heterogeneous objects (HO through rapid prototyping. Current research focuses on computer-aided design issues in heterogeneous object design. A new CAD modeling approach is proposed to integrate the material information into geometric regions thus model the material distributions in the heterogeneous object. The gradient references are used to represent the complex geometry heterogeneous objects which have simultaneous geometry intricacies and accurate material distributions. The gradient references helps in flexible manipulability and control to heterogeneous objects, which guarantees the local control over gradient regions of developed heterogeneous objects. A systematic approach on data flow, processing, computer visualization, and slicing of heterogeneous objects for rapid prototyping is also presented.

  17. Computer Aided Design Modeling for Heterogeneous Objects

    CERN Document Server

    Gupta, Vikas; Tandon, Puneet

    2010-01-01

    Heterogeneous object design is an active research area in recent years. The conventional CAD modeling approaches only provide geometry and topology of the object, but do not contain any information with regard to the materials of the object and so can not be used for the fabrication of heterogeneous objects (HO) through rapid prototyping. Current research focuses on computer-aided design issues in heterogeneous object design. A new CAD modeling approach is proposed to integrate the material information into geometric regions thus model the material distributions in the heterogeneous object. The gradient references are used to represent the complex geometry heterogeneous objects which have simultaneous geometry intricacies and accurate material distributions. The gradient references helps in flexible manipulability and control to heterogeneous objects, which guarantees the local control over gradient regions of developed heterogeneous objects. A systematic approach on data flow, processing, computer visualizat...

  18. Computer-aided control system design

    International Nuclear Information System (INIS)

    Control systems are typically implemented using conventional PID controllers, which are then tuned manually during plant commissioning to compensate for interactions between feedback loops. As plants increase in size and complexity, such controllers can fail to provide adequate process regulations. Multivariable methods can be utilized to overcome these limitations. At the Chalk River Nuclear Laboratories, modern control systems are designed and analyzed with the aid of MVPACK, a system of computer programs that appears to the user like a high-level calculator. The software package solves complicated control problems, and provides useful insight into the dynamic response and stability of multivariable systems

  19. PLAID- A COMPUTER AIDED DESIGN SYSTEM

    Science.gov (United States)

    Brown, J. W.

    1994-01-01

    PLAID is a three-dimensional Computer Aided Design (CAD) system which enables the user to interactively construct, manipulate, and display sets of highly complex geometric models. PLAID was initially developed by NASA to assist in the design of Space Shuttle crewstation panels, and the detection of payload object collisions. It has evolved into a more general program for convenient use in many engineering applications. Special effort was made to incorporate CAD techniques and features which minimize the users workload in designing and managing PLAID models. PLAID consists of three major modules: the Primitive Object Generator (BUILD), the Composite Object Generator (COG), and the DISPLAY Processor. The BUILD module provides a means of constructing simple geometric objects called primitives. The primitives are created from polygons which are defined either explicitly by vertex coordinates, or graphically by use of terminal crosshairs or a digitizer. Solid objects are constructed by combining, rotating, or translating the polygons. Corner rounding, hole punching, milling, and contouring are special features available in BUILD. The COG module hierarchically organizes and manipulates primitives and other previously defined COG objects to form complex assemblies. The composite object is constructed by applying transformations to simpler objects. The transformations which can be applied are scalings, rotations, and translations. These transformations may be defined explicitly or defined graphically using the interactive COG commands. The DISPLAY module enables the user to view COG assemblies from arbitrary viewpoints (inside or outside the object) both in wireframe and hidden line renderings. The PLAID projection of a three-dimensional object can be either orthographic or with perspective. A conflict analysis option enables detection of spatial conflicts or collisions. DISPLAY provides camera functions to simulate a view of the model through different lenses. Other

  20. Computer-aided design of antenna structures and components

    Science.gov (United States)

    Levy, R.

    1976-01-01

    This paper discusses computer-aided design procedures for antenna reflector structures and related components. The primary design aid is a computer program that establishes cross sectional sizes of the structural members by an optimality criterion. Alternative types of deflection-dependent objectives can be selected for designs subject to constraints on structure weight. The computer program has a special-purpose formulation to design structures of the type frequently used for antenna construction. These structures, in common with many in other areas of application, are represented by analytical models that employ only the three translational degrees of freedom at each node. The special-purpose construction of the program, however, permits coding and data management simplifications that provide advantages in problem size and execution speed. Size and speed are essentially governed by the requirements of structural analysis and are relatively unaffected by the added requirements of design. Computation times to execute several design/analysis cycles are comparable to the times required by general-purpose programs for a single analysis cycle. Examples in the paper illustrate effective design improvement for structures with several thousand degrees of freedom and within reasonable computing times.

  1. Intelligent Support for a Computer Aided Design Optimisation Cycle

    OpenAIRE

    B. Dolšak; Novak, M.; J. Kaljun

    2006-01-01

    It is becoming more and more evident that  adding intelligence  to existing computer aids, such as computer aided design systems, can lead to significant improvements in the effective and reliable performance of various engineering tasks, including design optimisation. This paper presents three different intelligent modules to be applied within a computer aided design optimisation cycle to enable more intelligent and less experience-dependent design performance. 

  2. Computer-aided software development process design

    Science.gov (United States)

    Lin, Chi Y.; Levary, Reuven R.

    1989-01-01

    The authors describe an intelligent tool designed to aid managers of software development projects in planning, managing, and controlling the development process of medium- to large-scale software projects. Its purpose is to reduce uncertainties in the budget, personnel, and schedule planning of software development projects. It is based on dynamic model for the software development and maintenance life-cycle process. This dynamic process is composed of a number of time-varying, interacting developmental phases, each characterized by its intended functions and requirements. System dynamics is used as a modeling methodology. The resulting Software LIfe-Cycle Simulator (SLICS) and the hybrid expert simulation system of which it is a subsystem are described.

  3. COMPUTER AIDED CHEMICAL PROCESS DESIGN METHODOLOGIES FOR POLLUTION REDUCTION(SYSTEMS ANALYSIS BRANCH, SUSTAINABLE TECHNOLOGY DIVISION, NRMRL)

    Science.gov (United States)

    The objective of the project is to develop computer optimization and simulation methodologies for the design of economical chemical manufacturing processes with a minimum of impact on the environment. The computer simulation and optimization tools developed in this project can be...

  4. Design analysis and computer-aided performance evaluation of shuttle orbiter electrical power system. Volume 1: Summary

    Science.gov (United States)

    1974-01-01

    Studies were conducted to develop appropriate space shuttle electrical power distribution and control (EPDC) subsystem simulation models and to apply the computer simulations to systems analysis of the EPDC. A previously developed software program (SYSTID) was adapted for this purpose. The following objectives were attained: (1) significant enhancement of the SYSTID time domain simulation software, (2) generation of functionally useful shuttle EPDC element models, and (3) illustrative simulation results in the analysis of EPDC performance, under the conditions of fault, current pulse injection due to lightning, and circuit protection sizing and reaction times.

  5. Computer-aided design of polymers and composites

    Science.gov (United States)

    Kaelble, D. H.

    1985-01-01

    This book on computer-aided design of polymers and composites introduces and discusses the subject from the viewpoint of atomic and molecular models. Thus, the origins of stiffness, strength, extensibility, and fracture toughness in composite materials can be analyzed directly in terms of chemical composition and molecular structure. Aspects of polymer composite reliability are considered along with characterization techniques for composite reliability, relations between atomic and molecular properties, computer aided design and manufacture, polymer CAD/CAM models, and composite CAD/CAM models. Attention is given to multiphase structural adhesives, fibrous composite reliability, metal joint reliability, polymer physical states and transitions, chemical quality assurance, processability testing, cure monitoring and management, nondestructive evaluation (NDE), surface NDE, elementary properties, ionic-covalent bonding, molecular analysis, acid-base interactions, the manufacturing science, and peel mechanics.

  6. Analysis of vulnerability to intrusion - a software for aid in training, design, and implementation of physical system

    International Nuclear Information System (INIS)

    Full text: In this paper, we discuss briefly the developed level of physical protection system (PPS) in different Chinese history stage, and the relation between PPS and society, politics, military and security. It reveals the current status of application of PPS in China, and the level of design, implementation, evaluation and products. We also discuss the developing direction and applying tendency of PPS in future China. We mainly introduce a software using the ASD to evaluate the effectiveness of the PPS at a facility. It is used for training, design, and implementation of physical system. It identifies the path which adversaries can follow to accomplish sabotage or theft. For a specific PPS and threat, the most vulnerable path can be determined. The path probability of interruption P(I) establishes of the total PPS. Especially, we introduce how to specify threat characteristics bases the situation of present Chinese society, based global and local threat development. We also introduce how to build a data base of different elements based on the level of crime at present China. (author)

  7. Computer-aided structural design of a lunar radio telescope

    Science.gov (United States)

    Akgul, Ferhat; Gerstle, Walter H.; Johnson, Stewart W.

    1990-01-01

    This paper describes a computer-aided structural design of the main reflector of a fully steerable radio telescope to be located (in the 21st century) on the moon, and presents the results of the structural analysis of the reflector. The reflector is a paraboloid with a surface area of 12,660 sq m and a focal ratio of 0.42. The reflector's surface will be covered by a 5.08 cm-thick sandwich panel made of thin-walled aluminum cells filled with low-density foam. The low weight of the design will be achieved by using graphite-epoxy as the structural material.

  8. Computer-aided design and computer science technology

    Science.gov (United States)

    Fulton, R. E.; Voigt, S. J.

    1976-01-01

    A description is presented of computer-aided design requirements and the resulting computer science advances needed to support aerospace design. The aerospace design environment is examined, taking into account problems of data handling and aspects of computer hardware and software. The interactive terminal is normally the primary interface between the computer system and the engineering designer. Attention is given to user aids, interactive design, interactive computations, the characteristics of design information, data management requirements, hardware advancements, and computer science developments.

  9. Arthritis Genetics Analysis Aids Drug Discovery

    Science.gov (United States)

    ... Matters NIH Research Matters January 13, 2014 Arthritis Genetics Analysis Aids Drug Discovery An international research team ... may play a role in triggering the disease. Genetic factors are also thought to play a role. ...

  10. Computer-Aided Design of Solid Catalysts

    Czech Academy of Sciences Publication Activity Database

    Holeňa, Martin; Baerns, M.

    Weinheim: Wiley, 2008 - (Ertl, G.; Knözinger, H.; Schüth, F.; Weitkamp, J.), s. 66-81 ISBN 978-3-527-31241-2 Institutional research plan: CEZ:AV0Z10300504 Keywords : combinatorial catalysis * design of experiments * catalyst optimization, * evolutionary methods * data analysis * artificial neural networks Subject RIV: IN - Informatics, Computer Science

  11. Software For Computer-Aided Design Of Control Systems

    Science.gov (United States)

    Wette, Matthew

    1994-01-01

    Computer Aided Engineering System (CAESY) software developed to provide means to evaluate methods for dealing with users' needs in computer-aided design of control systems. Interpreter program for performing engineering calculations. Incorporates features of both Ada and MATLAB. Designed to be flexible and powerful. Includes internally defined functions, procedures and provides for definition of functions and procedures by user. Written in C language.

  12. Mechatronical Aided Concept (MAC) in Intelligent Transport Vehicles Design

    OpenAIRE

    Pavel Pavlasek

    2003-01-01

    This article deals with the principles of synergy effect of mechatronical aided concept (MAC) to the design of intelligent transport vehicles products applying CA technologies and virtual reality design methods. Also includes presentation of intelligent railway vehicle development.

  13. Issues of a Computer-Aided Design of Hydraulic Jacks

    Science.gov (United States)

    Averchenkov, V. I.; Averchenkov, A. V.; Kolyakinand, V. V.; Orekhov, O. D.

    2016-04-01

    The article deals with the issues of a computer-aided design of hydraulic equipment, namely hydraulic jacks. Design principles of the hydraulic jack CAD system are described. In addition, the possibilities for the system improvement and expansion are considered.

  14. Efficient Use of Preisach Hysteresis Model in Computer Aided Design

    Directory of Open Access Journals (Sweden)

    IONITA, V.

    2013-05-01

    Full Text Available The paper presents a practical detailed analysis regarding the use of the classical Preisach hysteresis model, covering all the steps, from measuring the necessary data for the model identification to the implementation in a software code for Computer Aided Design (CAD in Electrical Engineering. An efficient numerical method is proposed and the hysteresis modeling accuracy is tested on magnetic recording materials. The procedure includes the correction of the experimental data, which are used for the hysteresis model identification, taking into account the demagnetizing effect for the sample that is measured in an open-circuit device (a vibrating sample magnetometer.

  15. Enhancing Engineering Computer-Aided Design Education Using Lectures Recorded on the PC

    Science.gov (United States)

    McGrann, Roy T. R.

    2006-01-01

    Computer-Aided Engineering (CAE) is a course that is required during the third year in the mechanical engineering curriculum at Binghamton University. The primary objective of the course is to educate students in the procedures of computer-aided engineering design. The solid modeling and analysis program Pro/Engineer[TM] (PTC[R]) is used as the…

  16. Computer-aided design development transition for IPAD environment

    Science.gov (United States)

    Owens, H. G.; Mock, W. D.; Mitchell, J. C.

    1980-01-01

    The relationship of federally sponsored computer-aided design/computer-aided manufacturing (CAD/CAM) programs to the aircraft life cycle design process, an overview of NAAD'S CAD development program, an evaluation of the CAD design process, a discussion of the current computing environment within which NAAD is developing its CAD system, some of the advantages/disadvantages of the NAAD-IPAD approach, and CAD developments during transition into the IPAD system are discussed.

  17. Computer aided pantograph design for garment panels

    Institute of Scientific and Technical Information of China (English)

    2001-01-01

    Discusses the difficulties and problems with manual pantograph ofgarment panels, introduces several typical pantographic ways and their characteristics both at home and abroad, presents a new pantographic method based on similar figures developed to overcome the deficiency of those methods, so as to realize computer aid automatic panel pantograph.

  18. The Research of Computer Aided Farm Machinery Designing Method Based on Ergonomics

    Science.gov (United States)

    Gao, Xiyin; Li, Xinling; Song, Qiang; Zheng, Ying

    Along with agricultural economy development, the farm machinery product type Increases gradually, the ergonomics question is also getting more and more prominent. The widespread application of computer aided machinery design makes it possible that farm machinery design is intuitive, flexible and convenient. At present, because the developed computer aided ergonomics software has not suitable human body database, which is needed in view of farm machinery design in China, the farm machinery design have deviation in ergonomics analysis. This article puts forward that using the open database interface procedure in CATIA to establish human body database which aims at the farm machinery design, and reading the human body data to ergonomics module of CATIA can product practical application virtual body, using human posture analysis and human activity analysis module to analysis the ergonomics in farm machinery, thus computer aided farm machinery designing method based on engineering can be realized.

  19. Computer aided nonlinear electrical networks analysis

    Science.gov (United States)

    Slapnicar, P.

    1977-01-01

    Techniques used in simulating an electrical circuit with nonlinear elements for use in computer-aided circuit analysis programs are described. Elements of the circuit include capacitors, resistors, inductors, transistors, diodes, and voltage and current sources (constant or time varying). Simulation features are discussed for dc, ac, and/or transient circuit analysis. Calculations are based on the model approach of formulating the circuit equations. A particular solution of transient analysis for nonlinear storage elements is described.

  20. Computer-aided dispatching system design specification

    International Nuclear Information System (INIS)

    This document defines the performance requirements for a graphic display dispatching system to support Hanford Patrol Operations Center. This document reflects the as-built requirements for the system that was delivered by GTE Northwest, Inc. This system provided a commercial off-the-shelf computer-aided dispatching system and alarm monitoring system currently in operations at the Hanford Patrol Operations Center, Building 2721E. This system also provides alarm back-up capability for the Plutonium Finishing Plant (PFP)

  1. Computer-aided dispatching system design specification

    Energy Technology Data Exchange (ETDEWEB)

    Briggs, M.G.

    1997-12-16

    This document defines the performance requirements for a graphic display dispatching system to support Hanford Patrol Operations Center. This document reflects the as-built requirements for the system that was delivered by GTE Northwest, Inc. This system provided a commercial off-the-shelf computer-aided dispatching system and alarm monitoring system currently in operations at the Hanford Patrol Operations Center, Building 2721E. This system also provides alarm back-up capability for the Plutonium Finishing Plant (PFP).

  2. Accelerating Battery Design Using Computer-Aided Engineering Tools: Preprint

    Energy Technology Data Exchange (ETDEWEB)

    Pesaran, A.; Heon, G. H.; Smith, K.

    2011-01-01

    Computer-aided engineering (CAE) is a proven pathway, especially in the automotive industry, to improve performance by resolving the relevant physics in complex systems, shortening the product development design cycle, thus reducing cost, and providing an efficient way to evaluate parameters for robust designs. Academic models include the relevant physics details, but neglect engineering complexities. Industry models include the relevant macroscopic geometry and system conditions, but simplify the fundamental physics too much. Most of the CAE battery tools for in-house use are custom model codes and require expert users. There is a need to make these battery modeling and design tools more accessible to end users such as battery developers, pack integrators, and vehicle makers. Developing integrated and physics-based CAE battery tools can reduce the design, build, test, break, re-design, re-build, and re-test cycle and help lower costs. NREL has been involved in developing various models to predict the thermal and electrochemical performance of large-format cells and has used in commercial three-dimensional finite-element analysis and computational fluid dynamics to study battery pack thermal issues. These NREL cell and pack design tools can be integrated to help support the automotive industry and to accelerate battery design.

  3. School District Uses Computer Aided Design and Drafting.

    Science.gov (United States)

    Lorentz, Gordon S.

    1988-01-01

    Computer Aided Design and Drafting (CADD) programs are used to teach drafting at an Indiana high school. The school system's maintenance department shared use of the software and equipment to produce original drawings of school buildings. (MLF)

  4. Adaptive subsystem aided design synthesis units REA on minicomputers

    Directory of Open Access Journals (Sweden)

    Yu. F. Zin'kovskii

    1986-04-01

    Full Text Available Questions of construction sub-aided design CAD integrated electronics units based on the principles of adaptation and self-tuning software and mathematical software for solving a specific problem.

  5. Computer Aided Design Tools for Extreme Environment Electronics Project

    Data.gov (United States)

    National Aeronautics and Space Administration — This project aims to provide Computer Aided Design (CAD) tools for radiation-tolerant, wide-temperature-range digital, analog, mixed-signal, and radio-frequency...

  6. The vehicle design evaluation program - A computer-aided design procedure for transport aircraft

    Science.gov (United States)

    Oman, B. H.; Kruse, G. S.; Schrader, O. E.

    1977-01-01

    The vehicle design evaluation program is described. This program is a computer-aided design procedure that provides a vehicle synthesis capability for vehicle sizing, external load analysis, structural analysis, and cost evaluation. The vehicle sizing subprogram provides geometry, weight, and balance data for aircraft using JP, hydrogen, or methane fuels. The structural synthesis subprogram uses a multistation analysis for aerodynamic surfaces and fuselages to develop theoretical weights and geometric dimensions. The parts definition subprogram uses the geometric data from the structural analysis and develops the predicted fabrication dimensions, parts material raw stock buy requirements, and predicted actual weights. The cost analysis subprogram uses detail part data in conjunction with standard hours, realization factors, labor rates, and material data to develop the manufacturing costs. The program is used to evaluate overall design effects on subsonic commercial type aircraft due to parameter variations.

  7. Computer-aided design of electrical machines

    CERN Document Server

    Murthy, KM Vishnu

    2008-01-01

    The aim of this book is to present the sequential steps for developing the computer programs for the design of electrical machines, using well-established design formulae. The data of magnetic and non-magnetic materials used in latest designs by industries, is applied for optimizing the design. Salient Features: MATLAB Version of C Language is used for computer programming because of its easiness and simplicity over conventional C Program. The total program is split into a number of parts and each part is run independently. The total program for total design is obtained by adding the programs

  8. MOBIC: Designing a Travel Aid for Blind and Elderly People

    Science.gov (United States)

    Petrie, Helen; Johnson, Valerie; Strothotte, Thomas; Raab, Andreas; Fritz, Steffi; Michel, Rainer

    This paper presents the research for the development of a new travel aid to increase the independent mobility of blind and elderly travellers. This aid will build on the technologies of geographical information systems (GIS) and the Global Positioning System (GPS). The MOBIC Travel Aid (MOTA) consists of two interrelated components: the MOBIC Pre-journey System (MOPS) to assist users in planning journeys and the MOBIC Outdoor System (MOODS) to execute these plans by providing users with orientation and navigation assistance during journeys. The MOBIC travel aid is complementary to primary mobility aids such as the long cane or guide dog. Results of a study of user requirements are presented and their implications for the initial design of the system are discussed.

  9. A Multi-Step and Multi-Level Approach for Computer Aided Molecular Design

    DEFF Research Database (Denmark)

    Harper, Peter Mathias; Gani, Rafiqul

    A general multi-step approach for setting up, solving and solution analysis of computer aided molecular design (CAMD) problems is presented. The approach differs from previous work within the field of CAMD since it also addresses the need for a computer aided problem formulation and result analysis....... The problem formulation step incorporates a knowledge base for the identification and setup of the design criteria. Candidate compounds are identified using a multi-level generate and test CAMD solution algorithm capable of designing molecules having a high level of molecular detail. A post solution...... step for result analysis and verification is included in the methodology. (C) 2000 Elsevier Science Ltd. All rights reserved....

  10. Computer Aided Aerodynamic Design of Missile Configuration

    OpenAIRE

    Panneerselvam, S; P. Theerthamalai; A.K. Sarkar

    1987-01-01

    Aerodynamic configurations of tactical missiles have to produce the required lateral force with minimum time lag to meet the required manoeuvability and response time. The present design which is mainly based on linearised potential flow involves (a) indentification of critical design points, (b) design of lifting components and their integration with mutual interference, (c) evaluation of aerodynamic characteristics, (d) checking its adequacy at otherpoints, (e) optimization of parameters an...

  11. Interactive graphical computer-aided design system

    Science.gov (United States)

    Edge, T. M.

    1975-01-01

    System is used for design, layout, and modification of large-scale-integrated (LSI) metal-oxide semiconductor (MOS) arrays. System is structured around small computer which provides real-time support for graphics storage display unit with keyboard, slave display unit, hard copy unit, and graphics tablet for designer/computer interface.

  12. Computer Program Aids Design Of Impeller Blades

    Science.gov (United States)

    Chen, Wei-Chung; Galazin, John V.

    1992-01-01

    Impeller blades for centrifugal turbopumps designed quickly with help of computer program. Generates blade contours and continually subjects them to evaluation. Checks physical parameters to ensure they are compatible with required performance and recycles design if criteria not met. Program written for centrifugal turbomachinery, also adapted to such axial pump components as inducer blades and stator vanes.

  13. An Analysis of Food Aid and Altruism

    OpenAIRE

    MoonJoong Tcha; Fiona Lio

    2002-01-01

    This study constructs an altruism model of food aid. A theoretical model is constructed and shows that how each country's donation to the recipient countries is determined, based on relevant variables in association with each donor country's altruism. Analyses of data using donations through the World Food Program indicate that an empirical analysis of food donation, which does not incorporate altruism, may provide misinformation regarding the effect of relevant variables, especially the leve...

  14. Space systems computer-aided design technology

    Science.gov (United States)

    Garrett, L. B.

    1984-01-01

    The interactive Design and Evaluation of Advanced Spacecraft (IDEAS) system is described, together with planned capability increases in the IDEAS system. The system's disciplines consist of interactive graphics and interactive computing. A single user at an interactive terminal can create, design, analyze, and conduct parametric studies of earth-orbiting satellites, which represents a timely and cost-effective method during the conceptual design phase where various missions and spacecraft options require evaluation. Spacecraft concepts evaluated include microwave radiometer satellites, communication satellite systems, solar-powered lasers, power platforms, and orbiting space stations.

  15. Ergonomics: an aid to system design

    International Nuclear Information System (INIS)

    In recent years, the engineering community has recognized that ergonomics can make significant contributions to system design. Working together engineers and ergonomists can create designs that effectively meet system goals. By considering the role of humans and technology in the context of systems and by reducing the potential for errors, gains can be made in overall system reliability. Such efforts can reduce the need for costly backfits and increase system efficiency. (author)

  16. Mechatronical Aided Concept (MAC in Intelligent Transport Vehicles Design

    Directory of Open Access Journals (Sweden)

    Pavel Pavlasek

    2003-01-01

    Full Text Available This article deals with the principles of synergy effect of mechatronical aided concept (MAC to the design of intelligent transport vehicles products applying CA technologies and virtual reality design methods. Also includes presentation of intelligent railway vehicle development.

  17. A Multi-step and Multi-level approach for Computer Aided Molecular Design

    DEFF Research Database (Denmark)

    A general multi-step approach for setting up, solving and solution analysis of computer aided molecular design (CAMD) problems is presented. The approach differs from previous work within the field of CAMD since it also addresses the need for a computer aided problem formulation and result analysis....... The problem formulation step incorporates a knowledge base for the identification and setup of the design criteria. Candidate compounds are identified using a multi-level generate and test CAMD solution algorithm capable of designing molecules having a high level of molecular detail. A post solution...... step using an Integrated Computer Aided System (ICAS) for result analysis and verification is included in the methodology. Keywords: CAMD, separation processes, knowledge base, molecular design, solvent selection, substitution, group contribution, property prediction, ICAS Introduction The use of...

  18. A Multi-Step and Multi-Level Approach for Computer Aided Molecular Design

    DEFF Research Database (Denmark)

    Harper, Peter Mathias; Gani, Rafiqul

    . The problem formulation step incorporates a knowledge base for the identification and setup of the design criteria. Candidate compounds are identified using a multi-level generate and test CAMD solution algorithm capable of designing molecules having a high level of molecular detail. A post solution......A general multi-step approach for setting up, solving and solution analysis of computer aided molecular design (CAMD) problems is presented. The approach differs from previous work within the field of CAMD since it also addresses the need for a computer aided problem formulation and result analysis...

  19. Computational Geometry and Computer-Aided Design

    Science.gov (United States)

    Fay, T. H. (Compiler); Shoosmith, J. N. (Compiler)

    1985-01-01

    Extended abstracts of papers addressing the analysis, representation, and synthesis of shape information are presented. Curves and shape control, grid generation and contouring, solid modelling, surfaces, and curve intersection are specifically addressed.

  20. Computer-Aided Chemical Product Design Framework: Design of High Performance and Environmentally Friendly Refrigerants

    DEFF Research Database (Denmark)

    Cignitti, Stefano; Zhang, Lei; Gani, Rafiqul

    reachable. The method is applied on refrigerant design for a heat pump cycle. It is shown how the presented framework can generate optimal novel refrigerants that are high performing and environmentally friendly. This is achieved through integrated product-process based optimization objective, namely...... refrigerants today (Mota-Babiloni et al., 2015). However, design of new refrigerants poses a great challenge and finding an optimum solution for a given application often faces trade-off issues between cycle performance and environmental criteria. In addition, following issues are still to be addressed. What...... target properties and needs should carefully be selected for a given heat pump cycle to ensure that an optimum refrigerant is found? How can cycle performance and environmental criteria be integrated at the product design stage and not in post-design analysis? Computer-aided product design methods enable...

  1. Computer-aided surface representation and design

    Science.gov (United States)

    Barnhill, R. E.

    1984-01-01

    New methods for representing and approximating three and four dimensional surfaces were created. These schemes are the core of our forthcoming Surface Software Package. Surfaces are understood adequately only through the use of dynamic computer graphics; therefore, graphics capability is also included. The numerous applications of surface methods include modeling physical phenomena (e.g., combustion) and designing objects (e.g., airplanes and cars).

  2. Computer aided design study of hypermixing nozzles

    Science.gov (United States)

    Mefferd, L. A.; Bevilacqua, P. M.

    1979-01-01

    The development of a nozzle which combines the hypermixing and lobe mechanisms to achieve further increases in jet entrainment and ejector performance is investigated. A computer program which incorporates a two equation turbulence model and is used to predict and compare the evolution of jets from various nozzle designs is discussed. Increasing the length of the nozzle lobes and an alternating lobe nozzle are a methods examined for increasing the entrainment rate.

  3. Computer-aided design of a coffee-dragging device

    Directory of Open Access Journals (Sweden)

    Marcus Vinicuis Morais de Oliveira

    2014-10-01

    Full Text Available Dragging is the most costly and time-consuming stage of the coffee harvest. Therefore, its mechanization is important. The objectives of this study were to design, build, and evaluate the dynamics of a coffee-dragging device in a laboratory setting. The prototype consists of a dragging device with rods mounted on a metal plate and a chassis. Computer-aided design (CAD software was used to generate a solid second-order tetrahedral mesh for use in finite element analyses of the device and its parts. It was possible to simulate and display the device’s errors and failures and generate data on part deformities, Von Mises tension, and equivalent efforts. Equations based on the Denavit–Hartenberg theory were developed to describe the dragging device kinematics, and the results obtained with these equations were compared to those for the design developed using the software program. A preliminary drawing analysis identified a lever-type system as the best configuration for the device, based on its simple construction and its ability to balance the weight of the project parts. The safety factor achieved was greater than 28. Adjustment of the vibration amplitude of the rods is possible using the eccentric shaft of the connecting rod drive. Finite element analyses was used to analyze the connecting rod and predict the likely failure points.

  4. Computer-Aided Design Of Sheet-Material Parts

    Science.gov (United States)

    Gilbert, Jeffrey L.; Paternoster, Vincent Y.; Levitt, Maureen L.; Osterloh, Mark R.

    1991-01-01

    Computer-aided-design system partly automates tedious process of designing and guiding assembly of small pieces of flat sheet material into large surfaces that approximate smoothly curved surfaces having complicated three-dimensional shapes. Capability provides for flexibility enabling designer to assess quickly and easily effects of changes in design in making engineering compromises among various sizes and shapes. Saves time and money in both design and fabrication. Used in rocket-engine application and other applications requiring design of sheet-material parts.

  5. Rule-oriented method for parameterized computer-aided design

    OpenAIRE

    Verroust, Anne; Schoneck, François; Roller, Dieter

    1992-01-01

    The paper presents an implementation for computer-aided design with dimensional parameters. The approach is based on the use of an expert system to uncouple constraint equations, and to find a possible sequence for the computation of the geometric elements for given dimension values. A set of rules for the expert system is described that solves the problem for 2D designs. The method is illustrated with an example design.

  6. Computer-aided power systems analysis

    CERN Document Server

    Kusic, George

    2008-01-01

    Computer applications yield more insight into system behavior than is possible by using hand calculations on system elements. Computer-Aided Power Systems Analysis: Second Edition is a state-of-the-art presentation of basic principles and software for power systems in steady-state operation. Originally published in 1985, this revised edition explores power systems from the point of view of the central control facility. It covers the elements of transmission networks, bus reference frame, network fault and contingency calculations, power flow on transmission networks, generator base power setti

  7. Information technology aided exploration of system design spaces

    Science.gov (United States)

    Feather, Martin S.; Kiper, James D.; Kalafat, Selcuk

    2004-01-01

    We report on a practical application of information technology techniques to aid system engineers effectively explore large design spaces. We make use of heuristic search, visualization and data mining, the combination of which we have implemented wtihin a risk management tool in use at JPL and NASA.

  8. On-Line Authoring Aids for Instructional Design.

    Science.gov (United States)

    Schulz, Russel E.; And Others

    Since the usefulness of the Interservice Procedures for Instructional Systems Development (IPISD) depends on authoring aids which enable personnel to translate IPISD procedures into instructional products, this project examined the feasibility of providing such "how to do it" guidance for the instructional design and development tasks identified…

  9. Computer Aided Design System for Developing Musical Fountain Programs

    Institute of Scientific and Technical Information of China (English)

    刘丹; 张乃尧; 朱汉城

    2003-01-01

    A computer aided design system for developing musical fountain programs was developed with multiple functions such as intelligent design, 3-D animation, manual modification and synchronized motion to make the development process more efficient. The system first analyzed the music form and sentiment using many basic features of the music to select a basic fountain program. Then, this program is simulated with 3-D animation and modified manually to achieve the desired results. Finally, the program is transformed to a computer control program to control the musical fountain in time with the music. A prototype system for the musical fountain was also developed. It was tested with many styles of music and users were quite satisfied with its performance. By integrating various functions, the proposed computer aided design system for developing musical fountain programs greatly simplified the design of the musical fountain programs.

  10. Computer-aided design of flight control systems

    Science.gov (United States)

    Stengel, Robert F.; Sircar, Subrata

    1991-01-01

    A computer program is presented for facilitating the development and assessment of flight control systems, and application to a control design is discussed. The program is a computer-aided control-system design program based on direct digital synthesis of a proportional-integral-filter controller with scheduled linear-quadratic-Gaussian gains and command generator tracking of pilot inputs. The FlightCAD system concentrates on aircraft dynamics, flight-control systems, stability and performance, and has practical engineering applications.

  11. SNL Mechanical Computer Aided Design (MCAD) guide 2007.

    Energy Technology Data Exchange (ETDEWEB)

    Moore, Brandon; Pollice, Stephanie L.; Martinez, Jack R.

    2007-12-01

    This document is considered a mechanical design best-practice guide to new and experienced designers alike. The contents consist of topics related to using Computer Aided Design (CAD) software, performing basic analyses, and using configuration management. The details specific to a particular topic have been leveraged against existing Product Realization Standard (PRS) and Technical Business Practice (TBP) requirements while maintaining alignment with sound engineering and design practices. This document is to be considered dynamic in that subsequent updates will be reflected in the main title, and each update will be published on an annual basis.

  12. Computer-Aided Design Of Turbine Blades And Vanes

    Science.gov (United States)

    Hsu, Wayne Q.

    1988-01-01

    Quasi-three-dimensional method for determining aerothermodynamic configuration of turbine uses computer-interactive analysis and design and computer-interactive graphics. Design procedure executed rapidly so designer easily repeats it to arrive at best performance, size, structural integrity, and engine life. Sequence of events in aerothermodynamic analysis and design starts with engine-balance equations and ends with boundary-layer analysis and viscous-flow calculations. Analysis-and-design procedure interactive and iterative throughout.

  13. Development of reactor design aid tool using virtual reality technology

    International Nuclear Information System (INIS)

    A new type of aid system for fusion reactor design, to which the virtual reality (VR) visualization and sonification techniques are applied, is developed. This system provides us with an intuitive interaction environment in the VR space between the observer and the designed objects constructed by the conventional 3D computer-aided design (CAD) system. We have applied the design aid tool to the heliotron-type fusion reactor design activity FFHR2m [A. Sagara, S. Imagawa, O. Mitarai, T. Dolan, T. Tanaka, Y. Kubota, et al., Improved structure and long -life blanket concepts for heliotron reactors, Nucl. Fusion 45 (2005) 258-263] on the virtual reality system CompleXcope [Y. Tamura, A. Kageyama, T. Sato, S. Fujiwara, H. Nakamura, Virtual reality system to visualize and auralize numerical imulation data, Comp. Phys. Comm. 142 (2001) 227-230] of the National Institute for Fusion Science, Japan, and have evaluated its performance. The tool includes the functions of transfer of the observer, translation and scaling of the objects, recording of the operations and the check of interference

  14. Analytical Design Package (ADP2): A computer aided engineering tool for aircraft transparency design

    Science.gov (United States)

    Wuerer, J. E.; Gran, M.; Held, T. W.

    1994-01-01

    The Analytical Design Package (ADP2) is being developed as a part of the Air Force Frameless Transparency Program (FTP). ADP2 is an integrated design tool consisting of existing analysis codes and Computer Aided Engineering (CAE) software. The objective of the ADP2 is to develop and confirm an integrated design methodology for frameless transparencies, related aircraft interfaces, and their corresponding tooling. The application of this methodology will generate high confidence for achieving a qualified part prior to mold fabrication. ADP2 is a customized integration of analysis codes, CAE software, and material databases. The primary CAE integration tool for the ADP2 is P3/PATRAN, a commercial-off-the-shelf (COTS) software tool. The open architecture of P3/PATRAN allows customized installations with different applications modules for specific site requirements. Integration of material databases allows the engineer to select a material, and those material properties are automatically called into the relevant analysis code. The ADP2 materials database will be composed of four independent schemas: CAE Design, Processing, Testing, and Logistics Support. The design of ADP2 places major emphasis on the seamless integration of CAE and analysis modules with a single intuitive graphical interface. This tool is being designed to serve and be used by an entire project team, i.e., analysts, designers, materials experts, and managers. The final version of the software will be delivered to the Air Force in Jan. 1994. The Analytical Design Package (ADP2) will then be ready for transfer to industry. The package will be capable of a wide range of design and manufacturing applications.

  15. Brainlab: a Python toolkit to aid in the design, simulation, and analysis of spiking neural networks with the NeoCortical Simulator

    Directory of Open Access Journals (Sweden)

    Richard P Drewes

    2009-05-01

    Full Text Available Neuroscience modeling experiments often involve multiple complex neural network and cell model variants, complex input stimuli and input protocols, followed by complex data analysis. Coordinating all this complexity becomes a central difficulty for the experimenter. The Python programming language, along with its extensive library packages, has emerged as a leading ``glue'' tool for managing all sorts of complex programmatictasks. This paper describes a toolkit called Brainlab, written in Python, that leverages Python's strengths for the task of managing the general complexity of neuroscience modeling experiments. Brainlab was also designed to overcome the major difficulties of working with the NCS environment in particular. Brainlab is an integrated model building, experimentation, and data analysis environment for the powerful parallel spiking neural network simulator system NCS (the NeoCortical Simulator.

  16. The Computer Aided Aircraft-design Package (CAAP)

    Science.gov (United States)

    Yalif, Guy U.

    1994-01-01

    The preliminary design of an aircraft is a complex, labor-intensive, and creative process. Since the 1970's, many computer programs have been written to help automate preliminary airplane design. Time and resource analyses have identified, 'a substantial decrease in project duration with the introduction of an automated design capability'. Proof-of-concept studies have been completed which establish 'a foundation for a computer-based airframe design capability', Unfortunately, today's design codes exist in many different languages on many, often expensive, hardware platforms. Through the use of a module-based system architecture, the Computer aided Aircraft-design Package (CAAP) will eventually bring together many of the most useful features of existing programs. Through the use of an expert system, it will add an additional feature that could be described as indispensable to entry level engineers and students: the incorporation of 'expert' knowledge into the automated design process.

  17. Technology computer aided design simulation for VLSI MOSFET

    CERN Document Server

    Sarkar, Chandan Kumar

    2013-01-01

    Responding to recent developments and a growing VLSI circuit manufacturing market, Technology Computer Aided Design: Simulation for VLSI MOSFET examines advanced MOSFET processes and devices through TCAD numerical simulations. The book provides a balanced summary of TCAD and MOSFET basic concepts, equations, physics, and new technologies related to TCAD and MOSFET. A firm grasp of these concepts allows for the design of better models, thus streamlining the design process, saving time and money. This book places emphasis on the importance of modeling and simulations of VLSI MOS transistors and

  18. Modeling And Simulation Of Bar Code Scanners Using Computer Aided Design Software

    Science.gov (United States)

    Hellekson, Ron; Campbell, Scott

    1988-06-01

    Many optical systems have demanding requirements to package the system in a small 3 dimensional space. The use of computer graphic tools can be a tremendous aid to the designer in analyzing the optical problems created by smaller and less costly systems. The Spectra Physics grocery store bar code scanner employs an especially complex 3 dimensional scan pattern to read bar code labels. By using a specially written program which interfaces with a computer aided design system, we have simulated many of the functions of this complex optical system. In this paper we will illustrate how a recent version of the scanner has been designed. We will discuss the use of computer graphics in the design process including interactive tweaking of the scan pattern, analysis of collected light, analysis of the scan pattern density, and analysis of the manufacturing tolerances used to build the scanner.

  19. Simulation tools for computer-aided design and numerical investigations of high-power gyrotrons

    International Nuclear Information System (INIS)

    Modelling and simulation are essential tools for computer-aided design (CAD), analysis and optimization of high-power gyrotrons used as radiation sources for electron cyclotron resonance heating (ECRH) and current drive (ECCD) of magnetically confined plasmas in the thermonuclear reactor ITER. In this communication, we present the current status of our simulation tools and discuss their further development.

  20. Discrete Dipole Approximation Aided Design Method for Nanostructure Arrays

    Institute of Scientific and Technical Information of China (English)

    ZHU Shao-Li; LUO Xian-Gang; DU Chun-Lei

    2007-01-01

    A discrete dipole approximation (DDA) aided design method is proposed to determine the parameters of nanostructure arrays. The relationship between the thickness, period and extinction efficiency of nanostructure arrays for the given shape can be calculated using the DDA. Based on the calculated curves, the main parameters of the nanostructure arrays such as thickness and period can be determined. Using this aided method, a rhombic sliver nanostructure array is designed with the determinant parameters of thickness (40 nm) and period (440 nm).We further fabricate the rhombic sliver nanostructure arrays and testify the character of the extinction spectra.The obtained extinction spectra is within the visible range and the full width at half maximum is 99nm, as is expected.

  1. CEGB intergraph computer aided design system as an aid for the navigation of remote manipulators

    International Nuclear Information System (INIS)

    Computer Aided Design Systems with 3D Graphic capability can offer substantial benefits for the simulation and navigation of remote manipulators. The CEGB has been experimenting with its own Corporate INTERGRAPH CAD Network using as an example a remote links manipulator working within the above gas baffle dome area of an Advanced Gas Cooled Reactor. A report of this work is presented together with graphic simulations of the manipulator within the above dome area and reconstructions of images anticipated from the on board cameras. Future improvements in the speed of graphic processing will enable these techniques to be used for the on-line navigation of manipulators, as an aid to the interpretation of video images and for the training of operators without the need for full size test and training facilities. (author)

  2. Computational thermodynamics aided design of novel ferritic alloys

    Energy Technology Data Exchange (ETDEWEB)

    Yang, Ying [Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States); Chen, Tianyi [Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States); Tan, Lizhen [Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)

    2016-06-30

    With the aid of computational thermodynamics, Ni was identified to suppress the liquidus temperature of Fe2Zr and four Fe-Cr-Ni-Zr alloys were designed to study the Ni effect on the phase stability of Fe2Zr laves_phase. These alloys were fabricated through traditional arc-metling, followed by annealing at 1000 C for 336 hours and 700 C for 1275 hours. The microstructure were examined and characterized by SEM BSE image, EDS compositional mapping and point scan, XRD and TEM analysis. The major results were summarized below: 1)For investigated alloys with 12wt% Cr, 3~6wt% Zr and 3~9 wt%Ni, the phases in equilibrium with the BCC phase are C15_Laves phase, Fe23Zr6 phase. The volume fraction of intermetallic phases increases with Ni and Zr contents. 2)Instead of (Fe,Cr)2Zr C14_Laves phase, Ni stabilizes the C15_Laves structure in Fe-Cr-Ni-Zr alloys by substituting Fe and Cr atoms with Ni atoms in the first sublattice. 3)Fe23Zr6, that is metastable in the Fe-Cr-Zr ternary, is also stabilized by Ni addition. 4)Ni7Zr2 phase was observed in samples with high Ni/Zr ratio. Extensive solubility of Fe was identified in the phase. The microstructural and composition results obtained from this study will be incorportated into the the Fe-Cr-Ni-Zr database. The current samples will be subjected to ion irradiaition to be compared with those results for Fe-Cr-Zr alloys. Additional alloys will be designed to form (Fe,Cr,Ni)2Zr nanoprecipitates for further studies.

  3. A computer aided design procedure for generating gear teeth

    Science.gov (United States)

    Chang, S. H.; Huston, R. L.; Coy, J. J.

    1984-01-01

    A procedure for computer aided design (CAD) of gear teeth is presented. It is developed for generated teeth fabricated by a hob cutter or a shaper. It provides a means for analytically and numerically determining the tooth profile, given the cutter profile. An illustrative example with involute tooth profiles is given. Application with non-standard profiles and with bevel, spiral bevel, and hypoid gears is discussed.

  4. Using projection operators in computer aided geometric design

    OpenAIRE

    Busé, Laurent; Elkadi, Mohamed; Mourrain, Bernard

    2003-01-01

    We give an overview of resultant theory and some of its applications in computer aided geometric design. First, we mention different formulations of resultants, including the projective resultant, the toric resultant, and the residual resultant. In the second part we illustrate these tools, and other projection operators, on typical problems of CAGD such as surface implicitization, inversion, intersection, and detection of singularities of a parameterized surface.

  5. Modeling electric fields in two dimensions using computer aided design

    International Nuclear Information System (INIS)

    The authors describe a method for analyzing static electric fields in two dimensions using AutoCAD. The algorithm is coded in LISP and is modeled after Coloumb's Law. The software platform allows for facile graphical manipulations of field renderings and supports a wide range of hardcopy-output and data-storage formats. More generally, this application is representative of the ability to analyze data that is the solution to known mathematical functions with computer aided design (CAD)

  6. Aids in Spain and Immigration: Epidemiological Analysis

    OpenAIRE

    ualberto Buela-Casal****; Ángel Castro; María Paz-Bermúdez**

    2009-01-01

    The aim of this work was to analyze the current HIV/AIDS situation in Spain according to Spanish regions. Epidemiological HIV and AIDS Spanish data are analyzed and adjusted by population rates. Prevalence indexes and distribution by gender, age and way of transmission in the Spanish regions are compared. In addition, it is paid special attention to immigrant population as people who can take HIV/AIDS risk behaviors. Results revealed that the Spanish regions with the highest prevalence rates ...

  7. Computer-aided design of a coffee-dragging device

    OpenAIRE

    Marcus Vinicuis Morais de Oliveira; Mauri Martins Teixeira; Haroldo Carlos Fernandes; Daniel Marçal de Queiroz; Raphael Magalhães Gomes Moreira

    2014-01-01

    Dragging is the most costly and time-consuming stage of the coffee harvest. Therefore, its mechanization is important. The objectives of this study were to design, build, and evaluate the dynamics of a coffee-dragging device in a laboratory setting. The prototype consists of a dragging device with rods mounted on a metal plate and a chassis. Computer-aided design (CAD) software was used to generate a solid second-order tetrahedral mesh for use in finite element analyses of the device and its ...

  8. DEMAID - A DESIGN MANAGER'S AID FOR INTELLIGENT DECOMPOSITION (MACINTOSH VERSION)

    Science.gov (United States)

    Rogers, J. L.

    1994-01-01

    Many engineering systems are large and multi-disciplinary. Before the design of new complex systems such as large space platforms can begin, the possible interactions among subsystems and their parts must be determined. Once this is completed the proposed system can be decomposed to identify its hierarchical structure. DeMAID (A Design Manager's Aid for Intelligent Decomposition) is a knowledge-based system for ordering the sequence of modules and identifying a possible multilevel structure for the design problem. DeMAID displays the modules in an N x N matrix format (called a design structure matrix) where a module is any process that requires input and generates an output. (Modules which generate an output but do not require an input, such as an initialization process, are also acceptable.) Although DeMAID requires an investment of time to generate and refine the list of modules for input, it could save a considerable amount of money and time in the total design process, particularly in new design problems where the ordering of the modules has not been defined. The decomposition of a complex design system into subsystems requires the judgement of the design manager. DeMAID reorders and groups the modules based on the links (interactions) among the modules, helping the design manager make decomposition decisions early in the design cycle. The modules are grouped into circuits (the subsystems) and displayed in an N x N matrix format. Feedback links, which indicate an iterative process, are minimized and only occur within a subsystem. Since there are no feedback links among the circuits, the circuits can be displayed in a multilevel format. Thus, a large amount of information is reduced to one or two displays which are stored for later retrieval and modification. The design manager and leaders of the design teams then have a visual display of the design problem and the intricate interactions among the different modules. The design manager could save a substantial

  9. DEMAID - A DESIGN MANAGER'S AID FOR INTELLIGENT DECOMPOSITION (SUN VERSION)

    Science.gov (United States)

    Rogers, J. L.

    1994-01-01

    Many engineering systems are large and multi-disciplinary. Before the design of new complex systems such as large space platforms can begin, the possible interactions among subsystems and their parts must be determined. Once this is completed the proposed system can be decomposed to identify its hierarchical structure. DeMAID (A Design Manager's Aid for Intelligent Decomposition) is a knowledge-based system for ordering the sequence of modules and identifying a possible multilevel structure for the design problem. DeMAID displays the modules in an N x N matrix format (called a design structure matrix) where a module is any process that requires input and generates an output. (Modules which generate an output but do not require an input, such as an initialization process, are also acceptable.) Although DeMAID requires an investment of time to generate and refine the list of modules for input, it could save a considerable amount of money and time in the total design process, particularly in new design problems where the ordering of the modules has not been defined. The decomposition of a complex design system into subsystems requires the judgement of the design manager. DeMAID reorders and groups the modules based on the links (interactions) among the modules, helping the design manager make decomposition decisions early in the design cycle. The modules are grouped into circuits (the subsystems) and displayed in an N x N matrix format. Feedback links, which indicate an iterative process, are minimized and only occur within a subsystem. Since there are no feedback links among the circuits, the circuits can be displayed in a multilevel format. Thus, a large amount of information is reduced to one or two displays which are stored for later retrieval and modification. The design manager and leaders of the design teams then have a visual display of the design problem and the intricate interactions among the different modules. The design manager could save a substantial

  10. AIDS

    Science.gov (United States)

    ... page: //medlineplus.gov/ency/article/000594.htm HIV/AIDS To use the sharing features on this page, ... immunodeficiency virus (HIV) is the virus that causes AIDS. When a person becomes infected with HIV, the ...

  11. Visions of visualization aids - Design philosophy and observations

    Science.gov (United States)

    Ellis, Stephen R.

    1989-01-01

    Aids for the visualization of high-dimensional scientific or other data must be designed. Simply casting multidimensional data into a two-dimensional or three-dimensional spatial metaphor does not guarantee that the presentation will provide insight or a parsimonious description of phenomena implicit in the data. Useful visualization, in contrast to glitzy, high-tech, computer-graphics imagery, is generally based on preexisting theoretical beliefs concerning the underlying phenomena. These beliefs guide selection and formatting of the plotted variables. Visualization tools are useful for understanding naturally three-dimensional data bases such as those used by pilots or astronauts. Two examples of such aids for spatial maneuvering illustrate that informative geometric distortion may be introduced to assist visualization and that visualization of complex dynamics alone may not be adequate to provide the necessary insight into the underlying processes.

  12. Risk analysis. HIV / AIDS country profile: Senegal.

    Science.gov (United States)

    1996-12-01

    Since the first acquired immunodeficiency syndrome (AIDS) case was confirmed in 1986, Senegal has conducted an aggressive prevention campaign. Senegal's National AIDS Committee has noted the contributions of poverty and migration to the spread of AIDS. By June 1994, 1297 AIDS cases had been reported and an estimated 500,000 people (1.4% of the population) were infected with human immunodeficiency virus (HIV)-1 and 2. The highest rate of HIV infection (14%) exists among commercial sex workers. At present, HIV/AIDS cases are concentrated in Dakar, Kaolack, the Matam region, and Ziguinchor; however, the growing importance of inter-regional trading is expected to spread HIV to the smaller towns and rural areas. Also salient is the recent devaluation by 50% of the CFA franc, which has reduced the public sector workforce and led many poor urban residents into commercial sex work. CFA devaluation has made Senegal attractive to tourists and business visitors--another factor responsible for growth of the legalized commercial sex industry. Although sex workers are instructed in condom use and tested annually for HIV, only 850 of the 2000 registered sex workers have reported for check-ups, and the majority of prostitutes are unregistered. Senegal's AIDS Plan for 1994-98 focuses on care of AIDS patients, pressures placed on family structures by HIV, and AIDS-related erosions in the status of women. Each health service region has its own local plan for AIDS/HIV and sexually transmitted diseases, supervised by a regional committee. Public education has involved outreach to religious leaders, promotion of affordable condoms, and distribution of over 75,000 leaflets to key target populations. About US $16 million of the $25,688,875-budget HIV/AIDS program for 1994-98 was pledged by external donors. PMID:12320531

  13. Evolution of Geometric Sensitivity Derivatives from Computer Aided Design Models

    Science.gov (United States)

    Jones, William T.; Lazzara, David; Haimes, Robert

    2010-01-01

    The generation of design parameter sensitivity derivatives is required for gradient-based optimization. Such sensitivity derivatives are elusive at best when working with geometry defined within the solid modeling context of Computer-Aided Design (CAD) systems. Solid modeling CAD systems are often proprietary and always complex, thereby necessitating ad hoc procedures to infer parameter sensitivity. A new perspective is presented that makes direct use of the hierarchical associativity of CAD features to trace their evolution and thereby track design parameter sensitivity. In contrast to ad hoc methods, this method provides a more concise procedure following the model design intent and determining the sensitivity of CAD geometry directly to its respective defining parameters.

  14. Computer- Aided Design in Power Engineering Application of Software Tools

    CERN Document Server

    Stojkovic, Zlatan

    2012-01-01

    This textbooks demonstrates the application of software tools in solving a series of problems from the field of designing power system structures and systems. It contains four chapters: The first chapter leads the reader through all the phases necessary in the procedures of computer aided modeling and simulation. It guides through the complex problems presenting on the basis of eleven original examples. The second chapter presents  application of software tools in power system calculations of power systems equipment design. Several design example calculations are carried out using engineering standards like MATLAB, EMTP/ATP, Excel & Access, AutoCAD and Simulink. The third chapters focuses on the graphical documentation using a collection of software tools (AutoCAD, EPLAN, SIMARIS SIVACON, SIMARIS DESIGN) which enable the complete automation of the development of graphical documentation of a power systems. In the fourth chapter, the application of software tools in the project management in power systems ...

  15. The ergonomics of computer aided design within advanced manufacturing technology.

    Science.gov (United States)

    John, P A

    1988-03-01

    Many manufacturing companies have now awakened to the significance of computer aided design (CAD), although the majority of them have only been able to purchase computerised draughting systems of which only a subset produce direct manufacturing data. Such companies are moving steadily towards the concept of computer integrated manufacture (CIM), and this demands CAD to address more than draughting. CAD architects are thus having to rethink the basic specification of such systems, although they typically suffer from an insufficient understanding of the design task and have consequently been working with inadequate specifications. It is at this fundamental level that ergonomics has much to offer, making its contribution by encouraging user-centred design. The discussion considers the relationships between CAD and: the design task; the organisation and people; creativity; and artificial intelligence. It finishes with a summary of the contribution of ergonomics. PMID:15676646

  16. CAD/CAM (Computer Aided Design/Computer Aided Manufacture). A Brief Guide to Materials in the Library of Congress.

    Science.gov (United States)

    Havas, George D.

    This brief guide to materials in the Library of Congress (LC) on computer aided design and/or computer aided manufacturing lists reference materials and other information sources under 13 headings: (1) brief introductions; (2) LC subject headings used for such materials; (3) textbooks; (4) additional titles; (5) glossaries and handbooks; (6)…

  17. Single-tooth dento-osseous osteotomy with a computer-aided design/computer-aided manufacturing surgical guide

    Science.gov (United States)

    2016-01-01

    This clinical note introduces a method to assist surgeons in performing single-tooth dento-osseous osteotomy. For use in this method, a surgical guide was manufactured using computer-aided design/computer-aided manufacturing technology and was based on preoperative surgical simulation data. This method was highly conducive to successful single-tooth dento-osseous segmental osteotomy. PMID:27162756

  18. Use of computer modeling to aid in hydraulic barrier design

    International Nuclear Information System (INIS)

    Releases of No. 6 and No. 4 fuel oil were discovered at a private boarding school. The releases impact a nearby pond with non-aqueous phase liquid hydrocarbon (NAPL), and threaten to impact an adjacent wetland. Prior to implementation of a permanent remedial solution, such as surfactant treatment and bioremediation, immediate containment of the NAPL was proposed via a barrier-gate containment system. The proposed barrier-gate containment system consisted of a high-density polyethylene barrier, horizontal wells, three flow-through gates, and downgradient infiltration galleries. Computer modeling of groundwater and NAPL flow was conducted utilizing a finite element multiphase model to evaluate the impacts to local hydrogeology associated with the barrier. These impacts included upgradient groundwater mounding and restriction of groundwater flux to the wetland. Model simulations aided in the identification of improvements to the initial barrier design and guided subsequent design modifications. Results of the simulations indicate the usefulness of computer modeling in containment system design

  19. Computer-aided design of bevel gear tooth surfaces

    Science.gov (United States)

    Shuo, Hung Chang; Huston, Ronald L.; Coy, John J.

    1989-01-01

    This paper presents a computer-aided design procedure for generating bevel gears. The development is based on examining a perfectly plastic, cone-shaped gear blank rolling over a cutting tooth on a plane crown rack. The resulting impression on the plastic gear blank is the envelope of the cutting tooth. This impression and envelope thus form a conjugate tooth surface. Equations are presented for the locus of points on the tooth surface. The same procedures are then extended to simulate the generation of a spiral bevel gear. The corresponding governing equations are presented.

  20. Computer aided design of bevel gear tooth surfaces

    Science.gov (United States)

    Chang, S. H.; Huston, R. L.; Coy, J. J.

    1989-01-01

    This paper presents a computer-aided design procedure for generating bevel gears. The development is based on examining a perfectly plastic, cone-shaped gear blank rolling over a cutting tooth on a plane crown rack. The resulting impression on the plastic gear blank is the envelope of the cutting tooth. This impression and envelope thus form a conjugate tooth surface. Equations are presented for the locus of points on the tooth surface. The same procedures are then extended to simulate the generation of a spiral bevel gear. The corresponding governing equations are presented.

  1. Computer-aided design of bromelain and papain covalent immobilization

    OpenAIRE

    Bessy Cutiño-Avila; Dayrom Gil Pradas; Carlos Aragón Abreu; Yuniel Fernández Marrero; Martha Hernández de la Torre; Emir Salas Sarduy; María de los Ángeles Chávez Planes; José Manuel Guisán Seijas; Joaquín Díaz Brito; Alberto del Monte-Martínez

    2014-01-01

    Título en español: Diseño asistido por computadora de la inmovilización covalente de bromelina y papaína.Título corto: Computer-aided design of bromelain and papain. Abstract: Enzymes as immobilized derivatives have been widely used in Food, Agrochemical, Pharmaceutical and Biotechnological industries. Protein immobilization is probably the most used technology to improve the operational stability of these molecules. Bromelain (Ananas comosus) and papain (Carica papaya) are cystein proteases ...

  2. Computer Aided Design (CAD) Of Thin Film Optical Coatings

    Science.gov (United States)

    Rao, M. K.; Chye, Tan C.; Seng, Ow C.

    1986-10-01

    This paper presents description of a versatile software package for computer-aided design of thin film optical coatings, which has been developed by employing latest version of Turbo Pascal Language and can be run on any IBM or compatible personal computers. Both numerical and/or graphical output for transmittance and reflectance of a multilayer dielectric structure at various wavelengths are easily obtained. Other features in the package include interactive monitoring of thin film coatings during deposition process, saving of input parameters and results in the form of files, a look-up table for commonly used materials and facilities to provide parameters to an optical thickness monitor.

  3. Recent Developments on Computer Aided Fixture Design: Case Based Reasoning Approaches

    OpenAIRE

    Heidar Hashemi; Awaluddin Mohamed Shaharoun; Izman, S.; Denni Kurniawan

    2014-01-01

    Fixture design is an important issue in the process of manufacturing. As a critical design activity process, automation in fixture design plays an integral role in linking computer aided designs and computer aided manufacturing. This paper carries out a literature review of computer aided fixture design (CAFD) developments using intelligent methods that have been commonly utilized in automation in the last two decades. The first part of this review considers the steps of fixture design along ...

  4. Design, installation, and initial use of a smart operator aid

    International Nuclear Information System (INIS)

    This paper reviews the design, installation, and initial use of a smart operator aid that was developed to assist licensed personnel with the performance of power adjustments on the 5-MWt MIT Research Reactor (MITR-II). The aid is a computer-generated, predictive display that enables console operators to visualize the consequences of a planned control action prior to implementing that action. The motivation for the development of this display was the observation that present-time control decisions are made by comparing a plant's expected behavior to the desired response. Thus, an operator will achieve proper control only to the degree that he or she is capable of anticipating plant response. This may be difficult if the plant's dynamics are non-linear, time delayed, or counter-intuitive. A study was therefore undertaken at the MITR-11 to determine whether operator performance could be improved by using digital technology to provide visual displays of projected plant behavior. It was found that, while the use of predictive information had to be learned, operator performance did improve as a result of its availability. Information is presented on the display's design, the computer system utilized for its implementation, operator response to the display, and the possible extension of this concept to the control of steam generator level. 16 refs., 8 figs

  5. Design, installation, and initial use of a smart operator aid

    International Nuclear Information System (INIS)

    This paper reviews the design, installation, and initial use of a smart operator aid that was developed to assist licensed personnel with the performance of power adjustments on the 5-MWt MIT Research Reactor (MITR-II). The aid is a computer-generated, predictive display that enables console operators to visualize the consequences of a planned control action prior to implementing that action. The motivation for the development of this display was the observation that present-time control decisions are made by comparing a plant's expected behavior to the desired response. Thus, an operator will achieve proper control only to the degree that he or she is capable of anticipating plant response. This may be difficult if the plant's dynamics are non-linear, time delayed, or counter-intuitive. A study was therefore undertaken at the MITR-II to determine whether operator performance could be improved by using digital technology to provide visual displays of projected plant behavior. It was found that, while the use of predictive information had to be learned, operator performance did improve as a result of its availability. Information is presented on the display's design, the computer system utilized for its implementation, operator response to the display, and the possible extension of this concept to the control of steam generator level. (author)

  6. NALDA (Naval Aviation Logistics Data Analysis) CAI (computer aided instruction)

    Energy Technology Data Exchange (ETDEWEB)

    Handler, B.H. (Oak Ridge K-25 Site, TN (USA)); France, P.A.; Frey, S.C.; Gaubas, N.F.; Hyland, K.J.; Lindsey, A.M.; Manley, D.O. (Oak Ridge Associated Universities, Inc., TN (USA)); Hunnum, W.H. (North Carolina Univ., Chapel Hill, NC (USA)); Smith, D.L. (Memphis State Univ., TN (USA))

    1990-07-01

    Data Systems Engineering Organization (DSEO) personnel developed a prototype computer aided instruction CAI system for the Naval Aviation Logistics Data Analysis (NALDA) system. The objective of this project was to provide a CAI prototype that could be used as an enhancement to existing NALDA training. The CAI prototype project was performed in phases. The task undertaken in Phase I was to analyze the problem and the alternative solutions and to develop a set of recommendations on how best to proceed. The findings from Phase I are documented in Recommended CAI Approach for the NALDA System (Duncan et al., 1987). In Phase II, a structured design and specifications were developed, and a prototype CAI system was created. A report, NALDA CAI Prototype: Phase II Final Report, was written to record the findings and results of Phase II. NALDA CAI: Recommendations for an Advanced Instructional Model, is comprised of related papers encompassing research on computer aided instruction CAI, newly developing training technologies, instructional systems development, and an Advanced Instructional Model. These topics were selected because of their relevancy to the CAI needs of NALDA. These papers provide general background information on various aspects of CAI and give a broad overview of new technologies and their impact on the future design and development of training programs. The paper within have been index separately elsewhere.

  7. A review of computer-aided design/computer-aided manufacture techniques for removable denture fabrication.

    Science.gov (United States)

    Bilgin, Mehmet Selim; Baytaroğlu, Ebru Nur; Erdem, Ali; Dilber, Erhan

    2016-01-01

    The aim of this review was to investigate usage of computer-aided design/computer-aided manufacture (CAD/CAM) such as milling and rapid prototyping (RP) technologies for removable denture fabrication. An electronic search was conducted in the PubMed/MEDLINE, ScienceDirect, Google Scholar, and Web of Science databases. Databases were searched from 1987 to 2014. The search was performed using a variety of keywords including CAD/CAM, complete/partial dentures, RP, rapid manufacturing, digitally designed, milled, computerized, and machined. The identified developments (in chronological order), techniques, advantages, and disadvantages of CAD/CAM and RP for removable denture fabrication are summarized. Using a variety of keywords and aiming to find the topic, 78 publications were initially searched. For the main topic, the abstract of these 78 articles were scanned, and 52 publications were selected for reading in detail. Full-text of these articles was gained and searched in detail. Totally, 40 articles that discussed the techniques, advantages, and disadvantages of CAD/CAM and RP for removable denture fabrication and the articles were incorporated in this review. Totally, 16 of the papers summarized in the table. Following review of all relevant publications, it can be concluded that current innovations and technological developments of CAD/CAM and RP allow the digitally planning and manufacturing of removable dentures from start to finish. As a result according to the literature review CAD/CAM techniques and supportive maxillomandibular relationship transfer devices are growing fast. In the close future, fabricating removable dentures will become medical informatics instead of needing a technical staff and procedures. However the methods have several limitations for now. PMID:27095912

  8. An integrated computer aided system for integrated design of chemical processes

    DEFF Research Database (Denmark)

    Gani, Rafiqul; Hytoft, Glen; Jaksland, Cecilia;

    1997-01-01

    In this paper, an Integrated Computer Aided System (ICAS), which is particularly suitable for solving problems related to integrated design of chemical processes; is presented. ICAS features include a model generator (generation of problem specific models including model simplification and model......, design, control form the basis for the toolboxes. The available features of ICAS are highlighted through a case study involving the separation of binary azeotropic mixtures. (C) 1997 Elsevier Science Ltd....... reduction), a simulator (use of problem specific simulation strategies for steady state and dynamic simulation), toolboxes (thermodynamic toolbox, synthesis toolbox, control toolbox, design toolbox and analysis toolbox), and an interface for problem defintion. Each toolbox solves aspecific set of problems...

  9. Risk analysis. HIV / AIDS country profile: Mozambique.

    Science.gov (United States)

    1996-12-01

    Mozambique's National STD/AIDS Control Program (NACP) estimates that, at present, about 8% of the population is infected with human immunodeficiency virus (HIV). The epidemic is expected to peak in 1997. By 2001, Mozambique is projected to have 1,650,000 HIV-positive adults 15-49 years of age, of whom 500,000 will have developed acquired immunodeficiency syndrome (AIDS), and 500,000 AIDS orphans. Incidence rates are highest in the country's central region, the transport corridors, and urban centers. The rapid spread of HIV has been facilitated by extreme poverty, the social upheaval and erosion of traditional norms created by years of political conflict and civil war, destruction of the primary health care infrastructure, growth of the commercial sex work trade, and labor migration to and from neighboring countries with high HIV prevalence. Moreover, about 10% of the adult population suffers from sexually transmitted diseases (STDs), including genital ulcers. NACP, created in 1988, is attempting to curb the further spread of HIV through education aimed at changing high-risk behaviors and condom distribution to prevent STD transmission. Theater performances and radio/television programs are used to reach the large illiterate population. The integration of sex education and STD/AIDS information in the curricula of primary and secondary schools and universities has been approved by the Ministry of Education. Several private companies have been persuaded to distribute condoms to their employees. Finally, the confidentiality of HIV patients has been guaranteed. In 1993, the total AIDS budget was US $1.67 million, 50% of which was provided by the European Union. The European Commission seeks to develop a national strategy for managing STDs within the primary health care system. PMID:12320532

  10. Analysis and design of a 10- to 30-kW grid-connected solar-power system for the JPL fire station and first-aid station

    Energy Technology Data Exchange (ETDEWEB)

    Josephs, R.H.

    1982-04-15

    This study describes the design and estimates the performance of a modestly sized utility-connected power conditioning system and its supporting photovoltaic collector. The system will power special loads at JPL, Pasadena, California. The study also examines utility preparations and investigates how well guidelines have been developed to commingle the output of a small generating station with that of a large power network. The small photovoltaic system will provide a capability to study means to have an electrical power generator for small scale application conform with the necessarily inflexible organization of the community-sized power generating plant and distribution grid. No electrical storage is planned for the 10 kVA photovoltaic system and no surplus power is expected at the initial stage. Power is drawn from the utility when the array falls short of the load demand. The solar modules, numbering 315, are pedestal mounted at ground level with fixed orientation. Single phase power at 240 volts ac is supplied to the loads by the power conditioning equipment that will provide about 15% of the load demand. This design facilitates system scale-up to 30 kVA that can supply 42% of the load requirement with significant surplus power returned to the net.

  11. Brainlab: A Python Toolkit to Aid in the Design, Simulation, and Analysis of Spiking Neural Networks with the NeoCortical Simulator

    OpenAIRE

    Drewes, Rich; Zou, Quan; Goodman, Philip H.

    2009-01-01

    Neuroscience modeling experiments often involve multiple complex neural network and cell model variants, complex input stimuli and input protocols, followed by complex data analysis. Coordinating all this complexity becomes a central difficulty for the experimenter. The Python programming language, along with its extensive library packages, has emerged as a leading “glue” tool for managing all sorts of complex programmatic tasks. This paper describes a toolkit called Brainlab, written in Pyth...

  12. A Training Needs Analysis Case Study at Legal Aid Queensland

    Directory of Open Access Journals (Sweden)

    Claudia Davies

    2015-12-01

    Full Text Available Objective – Legal Aid Queensland Library Services plan, design and deliver a training program comprising seven individual components including induction training, individual instruction, group training, and regional office training. The program is guided by a formal, detailed training plan developed by experienced library trainers. Training needs assessment however has been informal and infrequent. Library Services commenced a formal training needs analysis (TNA in 2014. It was designed to gather evidence for decision making around future training activities. Methods – The TNA was comprised of five quantitative and qualitative components: analysis of catalogue and knowledge management database usage statistics; analysis of paid subscription usage statistics; analysis of library reference and research request data; work shadowing library clients; and interviews with selected team managers. Results – Each component revealed different aspects of our clients’ training needs. The results of the TNA revealed gaps in current training and education services, and opportunities for maximizing the effectiveness of our training program. The TNA also provided infrmation about our products and services beyond implications for training. Conclusion – As a result of the TNA the LAQ library has made changes to it training activities, which we believe are now more closely aligned with client needs and organizational objectives than they were in the past.

  13. Robust Design of Pilot-symbol-aided MIMO Channel Estimation

    Institute of Scientific and Technical Information of China (English)

    LUO Zhen-dong; LIU Yuan-an; GAO Jin-chun

    2004-01-01

    This paper investigates pilot-symbol-aided channel estimation/prediction for Multiple-Input Multiple-Output (MIMO) systems in fast fading environments. We first derive the design criteria of the optimal pilot blocks for energy, power and bandwidth-limited systems, respectively. Then two low-complexity channel estimation schemes are provided. Finally, we present a robust Minimum Mean Square Error (MMSE) channel estimator based on channel time correlation. Simulation shows the proposed MMSE estimator is considerably insensitive to channel statistics and significantly outperforms the traditional estimators with a low additional complexity in fast fading environments. By simply adjusting some parameters, the MMSE estimator can work as an estimator and a predictor simultaneously.

  14. Computer-Aided Vaccine Design: A Brief Report

    Directory of Open Access Journals (Sweden)

    R Ghasemi Khorasgani

    2012-09-01

    Full Text Available Background: Although the conventional vaccines have been instrumented in the incidence of many infectious diseases, the advances in genetic engineering and bioinformatics have provided the opportunity for developing improved and new vaccines.Methods: Reverse vaccinology was pioneered by a group of researchers investigating development of a vaccine against serogroup B Neisseria meningitidis. Reverse vaccinology analyzes the entire genome of a pathogen with the aid of computational programs to identify potentially antigenic extracellular proteins.Results: Using this method for Neisseria meningitidis genome analysis, 600 secretory or surface-exposed proteins were identified and, subsequently, 350 proteins were expressed and purified. Finally, seven proteins capable of activating the immune system against a range of strains were identified.Conclusion: Improved computational techniques are now able to provide researchers with high-confidence predictions for complex biological characteristics. This will herald a move to computer-aided biotechnology in which time-consuming and expensive large-scale experimental approaches are progressively replaced by functional bioinformatic investigations.

  15. Operating cost analysis aids gas turbine selection

    Energy Technology Data Exchange (ETDEWEB)

    Roy, G.K. [PT Indo-Rama Synthetics tbk., Purwakarta (Indonesia)

    1998-02-01

    If one considers the design life of a gas turbine to be 20 years, probably more than 70% of the plant operating costs will consist of fuel. And as fuel cost varies geographically, it is obvious that choosing a gas turbine, or for that matter any other prime mover, will depend on the fuel cost prevailing in that country. Spreadsheets make the analysis easier. A few options are presented to show the possible variations. The data taken for examples are typical. To illustrate the options, a typical requirement has been suggested for a plant--an electric power requirement of 50 MW and a process steam requirement of 70 tph. The selected gas/steam turbines, or diesel engine, will generate the electric power. When the equipment is down, the state electrical grid will provide the power.

  16. Structured computer-aided digital logic design: the S-1 Design System

    Energy Technology Data Exchange (ETDEWEB)

    Widdoes, L.C. Jr.; McWilliams, T.M.

    1977-03-31

    Structured computer-aided digital logic design is defined and an example of it is given, the S-1 Design System. It is noted that such a system has resulted in a very large reduction in the amount of designer effort required to complete the design of a large-scale digital processing system in the first exercise of its capabilities. This basic and generally applicable advance in digital design technology may be expected to affect quite favorably all complex digital systems developments. 3 figures.

  17. Hardware synthesis from DDL. [Digital Design Language for computer aided design and test of LSI

    Science.gov (United States)

    Shah, A. M.; Shiva, S. G.

    1981-01-01

    The details of the digital systems can be conveniently input into the design automation system by means of Hardware Description Languages (HDL). The Computer Aided Design and Test (CADAT) system at NASA MSFC is used for the LSI design. The Digital Design Language (DDL) has been selected as HDL for the CADAT System. DDL translator output can be used for the hardware implementation of the digital design. This paper addresses problems of selecting the standard cells from the CADAT standard cell library to realize the logic implied by the DDL description of the system.

  18. Fracture resistance of computer-aided design/computer-aided manufacturing-generated composite resin-based molar crowns.

    Science.gov (United States)

    Harada, Akio; Nakamura, Keisuke; Kanno, Taro; Inagaki, Ryoichi; Örtengren, Ulf; Niwano, Yoshimi; Sasaki, Keiichi; Egusa, Hiroshi

    2015-04-01

    The aim of this study was to investigate whether different fabrication processes, such as the computer-aided design/computer-aided manufacturing (CAD/CAM) system or the manual build-up technique, affect the fracture resistance of composite resin-based crowns. Lava Ultimate (LU), Estenia C&B (EC&B), and lithium disilicate glass-ceramic IPS e.max press (EMP) were used. Four types of molar crowns were fabricated: CAD/CAM-generated composite resin-based crowns (LU crowns); manually built-up monolayer composite resin-based crowns (EC&B-monolayer crowns); manually built-up layered composite resin-based crowns (EC&B-layered crowns); and EMP crowns. Each type of crown was cemented to dies and the fracture resistance was tested. EC&B-layered crowns showed significantly lower fracture resistance compared with LU and EMP crowns, although there was no significant difference in flexural strength or fracture toughness between LU and EC&B materials. Micro-computed tomography and fractographic analysis showed that decreased strength probably resulted from internal voids in the EC&B-layered crowns introduced by the layering process. There was no significant difference in fracture resistance among LU, EC&B-monolayer, and EMP crowns. Both types of composite resin-based crowns showed fracture loads of >2000 N, which is higher than the molar bite force. Therefore, CAD/CAM-generated crowns, without internal defects, may be applied to molar regions with sufficient fracture resistance. PMID:25683749

  19. Assessment of Chair-side Computer-Aided Design and Computer-Aided Manufacturing Restorations: A Review of the Literature

    OpenAIRE

    Baroudi, Kusai; Ibraheem, Shukran Nasser

    2015-01-01

    Background: This paper aimed to evaluate the application of computer-aided design and computer-aided manufacturing (CAD-CAM) technology and the factors that affect the survival of restorations. Materials and Methods: A thorough literature search using PubMed, Medline, Embase, Science Direct, Wiley Online Library and Grey literature were performed from the year 2004 up to June 2014. Only relevant research was considered. Results: The use of chair-side CAD/CAM systems is promising in all dental...

  20. Analysis of cement superplasticizers and grinding aids a literature survey

    International Nuclear Information System (INIS)

    This literature survey reviews the methods for analysis of cement plasticizers and organic grounding aids in cement solutions in preparation of grouts/concrete and methods for determination of plasticizers and grinding aids in groundwater conditions. The survey focuses on three different types of superplasticizers: sulphonated naphthalene condensates, sulphonated melamine condensates and polycarboxylates. There are various organic grinding aids, such as alkanolamines, glycols or phenolic compounds, used in the cement industry. This review is concerned with the following compounds: triethylenetetramine, tetraethylenepentamine, diethanolamine, triethanolamine, triisopropanolamine, ethyleneglycol, diethyleneglycol, aminoethylethanolamine, hydroxyethyl diethylenetriamine and phenol. (orig.)

  1. System analysis and design

    International Nuclear Information System (INIS)

    This book deals with information technology and business process, information system architecture, methods of system development, plan on system development like problem analysis and feasibility analysis, cases for system development, comprehension of analysis of users demands, analysis of users demands using traditional analysis, users demands analysis using integrated information system architecture, system design using integrated information system architecture, system implementation, and system maintenance.

  2. Experiences in control system design aided by interactive computer programs: temperature control of the laser isotope separation vessel

    International Nuclear Information System (INIS)

    A robust control system has been designed to regulate temperature in a vacuum vessel. The thermodynamic process is modeled by a set of nonlinear, implicit differential equations. The control design and analysis task exercised many of the computer-aided control systems design software packages, including MATLAB, DELIGHT, and LSAP. The working environment is a VAX computer. Advantages and limitations of the software and environment, and the impact on final controller design is discussed

  3. Computer-aided design and optimization of centrifugal pumps

    Energy Technology Data Exchange (ETDEWEB)

    Asuaje, M.; Bakir, F.; Kouidri, S.; Noguera, R.; Rey, R.

    2005-03-15

    Improvement in computer power and the development of numerical computational methods over the last few years have allowed the emergence of computational fluid dynamic (CFD) codes, making possible the numerical simulation of flow and energy transfer in turbo machines. To improve the efficiency of these tools, fast design software must be used. Within the framework of the optimization process of centrifugal pumps, HELIOX software was developed. It is a tool for design and performance analysis of centrifugal pumps. HELIOX allows quick design of new pumps and improvement of existing ones. HELIOX's performance analysis has been validated through many industrial cases: approximately 100 machines of different sizes and mechanical power. Heliox can be linked to quasi-and three-dimensional analysis tools; these tools enable a better understanding of physical phenomena so as to control the flow fields inside pumps. (Author)

  4. Large Advanced Space Systems (LASS) computer-aided design program additions

    Science.gov (United States)

    Farrell, C. E.

    1982-01-01

    The LSS preliminary and conceptual design requires extensive iteractive analysis because of the effects of structural, thermal, and control intercoupling. A computer aided design program that will permit integrating and interfacing of required large space system (LSS) analyses is discussed. The primary objective of this program is the implementation of modeling techniques and analysis algorithms that permit interactive design and tradeoff studies of LSS concepts. Eight software modules were added to the program. The existing rigid body controls module was modified to include solar pressure effects. The new model generator modules and appendage synthesizer module are integrated (interfaced) to permit interactive definition and generation of LSS concepts. The mass properties module permits interactive specification of discrete masses and their locations. The other modules permit interactive analysis of orbital transfer requirements, antenna primary beam n, and attitude control requirements.

  5. Micrometric precision of prosthetic dental crowns obtained by optical scanning and computer-aided designing/computer-aided manufacturing system

    Science.gov (United States)

    das Neves, Flávio Domingues; de Almeida Prado Naves Carneiro, Thiago; do Prado, Célio Jesus; Prudente, Marcel Santana; Zancopé, Karla; Davi, Letícia Resende; Mendonça, Gustavo; Soares, Carlos José

    2014-08-01

    The current study evaluated prosthetic dental crowns obtained by optical scanning and a computer-aided designing/computer-aided manufacturing system using micro-computed tomography to compare the marginal fit. The virtual models were obtained with four different scanning surfaces: typodont (T), regular impressions (RI), master casts (MC), and powdered master casts (PMC). Five virtual models were obtained for each group. For each model, a crown was designed on the software and milled from feldspathic ceramic blocks. Micro-CT images were obtained for marginal gap measurements and the data were statistically analyzed by one-way analysis of variance followed by Tukey's test. The mean vertical misfit was T=62.6±65.2 μm; MC=60.4±38.4 μm; PMC=58.1±38.0 μm, and RI=89.8±62.8 μm. Considering a percentage of vertical marginal gap of up to 75 μm, the results were T=71.5%, RI=49.2%, MC=69.6%, and PMC=71.2%. The percentages of horizontal overextension were T=8.5%, RI=0%, MC=0.8%, and PMC=3.8%. Based on the results, virtual model acquisition by scanning the typodont (simulated mouth) or MC, with or without powder, showed acceptable values for the marginal gap. The higher result of marginal gap of the RI group suggests that it is preferable to scan this directly from the mouth or from MC.

  6. Aiding Design of Wave Energy Converters via Computational Simulations

    Science.gov (United States)

    Jebeli Aqdam, Hejar; Ahmadi, Babak; Raessi, Mehdi; Tootkaboni, Mazdak

    2015-11-01

    With the increasing interest in renewable energy sources, wave energy converters will continue to gain attention as a viable alternative to current electricity production methods. It is therefore crucial to develop computational tools for the design and analysis of wave energy converters. A successful design requires balance between the design performance and cost. Here an analytical solution is used for the approximate analysis of interactions between a flap-type wave energy converter (WEC) and waves. The method is verified using other flow solvers and experimental test cases. Then the model is used in conjunction with a powerful heuristic optimization engine, Charged System Search (CSS) to explore the WEC design space. CSS is inspired by charged particles behavior. It searches the design space by considering candidate answers as charged particles and moving them based on the Coulomb's laws of electrostatics and Newton's laws of motion to find the global optimum. Finally the impacts of changes in different design parameters on the power takeout of the superior WEC designs are investigated. National Science Foundation, CBET-1236462.

  7. A New Optimization Model for Computer-Aided Molecular Design Problems

    DEFF Research Database (Denmark)

    Zhang, Lei; Cignitti, Stefano; Gani, Rafiqul

    Computer-Aided Molecular Design (CAMD) is a method to design molecules with desired properties. That is, through CAMD, it is possible to generate molecules that match a specified set of target properties. CAMD has attracted much attention in recent years due to its ability to design novel as well...... as known molecules with desired properties. The attention is in particular targeted at the design of chemical based products, such as solvents, refrigerants, active pharmaceutical ingredients, polymers, surfactants, lubricants, and more [1]. Property prediction methods are needed in molecular design...... higher level analysis of the molecular structure and the final selection of the product. Samudra and Sahinidis [4] proposed a new optimization model using relaxed property targets and refined property targets with structural corrections. It is usually difficult to model and solve the MILP/MINLP problem...

  8. Computers in engineering 1983; Proceedings of the International Conference and Exhibit, Chicago, IL, August 7-11, 1983. Volume 1 - Computer-aided design, manufacturing, and simulation

    Science.gov (United States)

    Cokonis, T. J.

    The papers presented in this volume provide examples of the impact of computers on present engineering practice and indicate some future trends in computer-aided design, manufacturing, and simulation. Topics discussed include computer-aided design of turbine cycle configuration, managing and development of engineering computer systems, computer-aided manufacturing with robots in the automotive industry, and computer-aided design/analysis techniques of composite materials in the cure phase. Papers are also presented on computer simulation of vehicular propulsion systems, the performance of a hydraulic system simulator in a CAD environment, and computer simulation of hovercraft heave dynamics and control.

  9. Perceptions of the Design of Voice Output Communication Aids

    Science.gov (United States)

    Judge, Simon; Townend, Gillian

    2013-01-01

    Background: Voice output communication aids (VOCAs) are a key form of aided communication within the field of augmentative and alternative communication (AAC). In recent years, rapid developments in technology have resulted in an explosion of devices available commercially, yet little research has been conducted into what people who use VOCAs…

  10. Computer-aided Framework for Design of Pure, Mixed and Blended Products

    DEFF Research Database (Denmark)

    Cignitti, Stefano; Zhang, Lei; Gani, Rafiqul

    2015-01-01

    This paper presents a framework for computer-aided design of pure, mixed and blended chemical based products. The framework is a systematic approach to convert a Computer-aided Molecular, Mixture and Blend Design (CAMbD) formulation, based on needs and target properties, into a mixed integer non...

  11. 76 FR 25353 - Hikma Pharmaceuticals PLC; Analysis of Agreement Containing Consent Orders To Aid Public Comment

    Science.gov (United States)

    2011-05-04

    ... Hikma Pharmaceuticals PLC; Analysis of Agreement Containing Consent Orders To Aid Public Comment AGENCY... Pharmaceuticals PLC (``Hikma'') that is designed to remedy the anticompetitive effects of Hikma's acquisition of... Consent Agreement, Hikma would be required to divest to X-Gen Pharmaceuticals, Inc. (``X-Gen'') all...

  12. 78 FR 45194 - General Electric Company; Analysis of Proposed Agreement Containing Consent Order To Aid Public...

    Science.gov (United States)

    2013-07-26

    ... that your comment does not include any sensitive personal information, like anyone's Social Security... difficulties with its component supplier. Avio has the sole design responsibility for the AGB on the... General Electric Company; Analysis of Proposed Agreement Containing Consent Order To Aid Public...

  13. Computer Aided Design of Polygalacturonase II from Aspergillus niger

    Directory of Open Access Journals (Sweden)

    Ibrahim Ali Noorbatcha

    2011-12-01

    Full Text Available Pectin is a complex polysaccharide found in the cell walls of plants and consisting mainly of esterified D-galacturonic acid resides in α-(1-4 chain. In production of fruit juice, pectin contributes to fruit juice viscosity, thereby reducing the juice production and increasing the filtration time. Polygalacturonase improves the juice production process by rapid degradation of pectin. In this project we have designed a novel polygalacturonase enzyme using computer aided design approaches. The three dimension structure of polygalacturonase is first modeled on the basis of the known crystal structure. The active site in this enzyme is identified by manual and automated docking methods. Lamarckian genetic algorithm is used for automated docking and the active site is validated by comparing with existing experimental data. This is followed by in silico mutations of the enzymes and the automated docking process is repeated using the mutant enzymes. The strength of the binding of the ligands inside the active site is evaluated by computing the binding score using Potential Mean Force (PMF method. The in silico mutations R256Q and K258N are found to decrease the binding strength of the ligand at the active site, indicating lowering of enzyme activity, which is consistent with the experimental results. Hence in silico mutations can be used to design new polygalacturonase enzymes with improved enzyme activity.ABSTRAK: Pektin adalah polisakarida kompleks yang terdapat di dalam dinding sel tumbuhan dan sebahagian besarnya terdiri daripada asid D-galakturonik terester yang ditemui di dalam rantaian α-(1-4. Dalam penghasilan jus buah-buahan, pektin menyumbang dalam kepekatan jus buah-buahan, di mana ia mengurangkan penghasilan jus dan menambahkan masa penapisan. Poligalakturonase meningkatkan proses penghasilan jus dengan pemecahan pektin dengan cepat. Dalam projek ini, kami telah merangka satu enzim poligalakturonase baru dengan menggunakan pendekatan reka

  14. Analysis of Design Documentation

    DEFF Research Database (Denmark)

    Hansen, Claus Thorp

    1998-01-01

    has been established where we seek to identify useful design work patterns by retrospective analyses of documentation created during design projects. This paper describes the analysis method, a tentatively defined metric to evaluate identified work patterns, and presents results from the first...... analysis accomplished....

  15. PUZZLE - A program for computer-aided design of printed circuit artwork

    Science.gov (United States)

    Harrell, D. A. W.; Zane, R.

    1971-01-01

    Program assists in solving spacing problems encountered in printed circuit /PC/ design. It is intended to have maximum use for two-sided PC boards carrying integrated circuits, and also aids design of discrete component circuits.

  16. Foreign Aid Designed to Diminish Terrorist Atrocities can Increase Them

    OpenAIRE

    Spagat, M; Mandler, M.

    2004-01-01

    A domestic power faces an enemy and commits terrorist atrocities to increase the liklihood of victory. A foreign patron can grant aid to the power but prefers fewer or no atrocities. The domestic power responds by acquiescing in the creation of uncontrollable paramilitaries that commit even more atrocities. Once the paramilitaries are set up, aid flows and the atrocity level is high. Now suppose the foreign patron is uncertin whether the domextic power can control the paramilitaries. At a poo...

  17. Foreign Aid Designed to Diminish Terrorist Atrocities can Increase Them

    OpenAIRE

    Mandler, Michael; Spagat, Michael

    2003-01-01

    A domestic power faces an enemy and commits terrorist atrocities to increase the likelihood of victory. A foreign patron can grant aid to the power but prefers fewer or no atrocities. The domestic power responds by acquiescing in the creation of uncontrollable paramilitaries that commit even more atrocities. Once the paramilitaries are set up, aid flows and the atrocity level is high. Now suppose the foreign patron is uncertain whether the domestic power can control the paramilitaries. At a p...

  18. Fracture resistance of computer-aided design/computer-aided manufacturing-generated composite resin-based molar crowns

    OpenAIRE

    Harada, A.; Nakamura, Keisuke; Kanno, Taro; Inagaki, R.; Ørtengren, Ulf Thore; Niwano, Y; Sasaki, Keiichi; Egusa, Hiroshi

    2015-01-01

    The aim of this study was to investigate whether different fabrication processes, such as the computer-aided design/computer-aided manufacturing (CAD/CAM) system or the manual build-up technique, affect the fracture resistance of composite resin-based crowns. Lava Ultimate (LU), Estenia C&B (EC&B), and lithium disilicate glass-ceramic IPS e.max press (EMP) were used. Four types of molar crowns were fabricated: CAD/CAM-generated composite resin-based crowns (LU crowns); manua...

  19. Simulation-aided design and synthesis of hierarchically porous membranes.

    Science.gov (United States)

    Li, Fan; Wilker, Molly B; Stein, Andreas

    2012-05-15

    Free-standing silica membranes with hierarchical porosity (ca. 300 nm macropores surrounded by 6-8 nm mesopores) and controllable mesopore architecture were prepared by a dual-templating method, with the structural design aided by mesoscale simulation. To create a two-dimensional, hexagonal macropore array, polymeric colloidal hemisphere arrays were synthesized by a two-step annealing process starting with non-close-packed polystyrene sphere arrays on silicon coated with a sacrificial alumina layer. A silica precursor containing a poly(ethylene) oxide-poly(propylene oxide)-poly(ethylene) oxide (PEO-PPO-PEO) triblock-copolymer surfactant as template for mesopore creation was spin-coated onto the support and aged and then converted into the free-standing membranes by dissolving both templates and the alumina layer. To test the hypothesis that the mesopore architecture may be influenced by confinement of the surfactant-containing precursor solution in the colloidal array and by its interactions with the polymeric colloids, the system was studied theoretically by dissipative particle dynamics (DPD) simulations and experimentally by examining the pore structures of silica membranes via electron microscopy. The DPD simulations demonstrated that, while only tilted columnar structure can be formed through tuning the interaction with the substrate, perfect alignment of 2D hexagonal micelles perpendicular to the plane of the membrane is achievable by confinement between parallel walls that interact preferentially with the hydrophilic components (PEO blocks, silicate, and solvent). The simulations predicted that this alignment could be maintained across a span of up to 10 columns of micelles, the same length scale defined by the colloidal array. In the actual membranes, we manipulated the mesopore alignment by tuning the solvent polarity relative to the polar surface characteristics of the colloidal hemispheres. With methanol as a solvent, columnar mesopores parallel to the

  20. Radiation as an aid to analysis

    International Nuclear Information System (INIS)

    Radiochemical methods of analysis possess some special advantages, such as rapidity and great sensitivity, and can on occasion provide results which would not be attainable by other means. They are finding an increasing number and variety of applications not only in pure research, but in medicine and health, in many industries such as mining, textiles, metallurgy and the oil industry, and in some other fields such as archaeology and criminology. These matters were discussed at an IAEA symposium at Salzburg, 19 - 23 October 1964, in which 278 participants joined, from 28 countries and five international organizations. Most of the emphasis at the conference was on radioactivation analysis, which occupied six out of the nine sessions. Under this method, the material to be studied is exposed to neutrons or charged particles, or electromagnetic radiation such as X-rays. This causes nuclear transformations in the material, followed by radioactive decay. Each element forms nuclides which emit radiation of characteristic energy and half-life, by which the element can be identified and measured. Sessions were devoted to various applications, using as the source of radiation nuclear reactors, accelerators, and radioisotope sources; experimental techniques and the application of computers to activation analysis were also considered. Two sessions were devoted to the use of radioactive tracers in analysis, and one to the use of radioactive sources for elementary analysis by observing how radiation is absorbed and scattered, or how, when a sample is exposed to radiation, it emits secondary radiation

  1. ACSYNT - A standards-based system for parametric, computer aided conceptual design of aircraft

    Science.gov (United States)

    Jayaram, S.; Myklebust, A.; Gelhausen, P.

    1992-01-01

    A group of eight US aerospace companies together with several NASA and NAVY centers, led by NASA Ames Systems Analysis Branch, and Virginia Tech's CAD Laboratory agreed, through the assistance of Americal Technology Initiative, in 1990 to form the ACSYNT (Aircraft Synthesis) Institute. The Institute is supported by a Joint Sponsored Research Agreement to continue the research and development in computer aided conceptual design of aircraft initiated by NASA Ames Research Center and Virginia Tech's CAD Laboratory. The result of this collaboration, a feature-based, parametric computer aided aircraft conceptual design code called ACSYNT, is described. The code is based on analysis routines begun at NASA Ames in the early 1970's. ACSYNT's CAD system is based entirely on the ISO standard Programmer's Hierarchical Interactive Graphics System and is graphics-device independent. The code includes a highly interactive graphical user interface, automatically generated Hermite and B-Spline surface models, and shaded image displays. Numerous features to enhance aircraft conceptual design are described.

  2. DeMAID/GA USER'S GUIDE Design Manager's Aid for Intelligent Decomposition with a Genetic Algorithm

    Science.gov (United States)

    Rogers, James L.

    1996-01-01

    Many companies are looking for new tools and techniques to aid a design manager in making decisions that can reduce the time and cost of a design cycle. One tool that is available to aid in this decision making process is the Design Manager's Aid for Intelligent Decomposition (DeMAID). Since the initial release of DEMAID in 1989, numerous enhancements have been added to aid the design manager in saving both cost and time in a design cycle. The key enhancement is a genetic algorithm (GA) and the enhanced version is called DeMAID/GA. The GA orders the sequence of design processes to minimize the cost and time to converge to a solution. These enhancements as well as the existing features of the original version of DEMAID are described. Two sample problems are used to show how these enhancements can be applied to improve the design cycle. This report serves as a user's guide for DeMAID/GA.

  3. Neutron activation analysis - an aid to forensic science

    International Nuclear Information System (INIS)

    Forensic Science is oriented towards the examination of evidence specimens, collected from a scene of crime in order to establish the link between the criminal and the crime. This science therefore has a profound role to play in criminal justice delivery system. The importance of neutron activation analysis (NAA) as a specialised technique to aid crime investigation has emerged and has been recognised

  4. A computer-aided design system geared toward conceptual design in a research environment. [for hypersonic vehicles

    Science.gov (United States)

    STACK S. H.

    1981-01-01

    A computer-aided design system has recently been developed specifically for the small research group environment. The system is implemented on a Prime 400 minicomputer linked with a CDC 6600 computer. The goal was to assign the minicomputer specific tasks, such as data input and graphics, thereby reserving the large mainframe computer for time-consuming analysis codes. The basic structure of the design system consists of GEMPAK, a computer code that generates detailed configuration geometry from a minimum of input; interface programs that reformat GEMPAK geometry for input to the analysis codes; and utility programs that simplify computer access and data interpretation. The working system has had a large positive impact on the quantity and quality of research performed by the originating group. This paper describes the system, the major factors that contributed to its particular form, and presents examples of its application.

  5. Computer Aided Design of Heat Treatment for AISI P20+Ni Mold Steel with Good Machinability

    Institute of Scientific and Technical Information of China (English)

    HU Xin-bin; GAO Wen; HE Yan-lin; LI Lin

    2004-01-01

    Computer aided design of heat treatment for AISI P20 mold steel with good machinability is attempted to proceed by the commercial software package Thermo-Calc (TCP+DICTRA). Through experimental and theoretical analysis of phase transformation during heat treatment, further knowledge of designing proper heat treatment is obtained. Then the machinability of AISI P20+Ni steel under given heat treatment condition is studied and the influencing factors to their machinability are analyzed. It is shown that heat treatment designed by computer simulation of carbide transformation is applicable to AISI P20+Ni steel with good machinability; AISI P20+Ni steel with tempered sorbite treated by quenching &tempering has optimal machinability; normalizing at the temperature of 910℃ & tempering can avoid cracking and result in acceptable machinability in small thickness module.

  6. Design and Analysis Facility

    Data.gov (United States)

    Federal Laboratory Consortium — Provides engineering design of aircraft components, subsystems and installations using Pro/E, Anvil 1000, CADKEY 97, AutoCAD 13. Engineering analysis tools include...

  7. Computer-aided Fault Tree Analysis

    International Nuclear Information System (INIS)

    A computer-oriented methodology for deriving minimal cut and path set families associated with arbitrary fault trees is discussed first. Then the use of the Fault Tree Analysis Program (FTAP), an extensive FORTRAN computer package that implements the methodology is described. An input fault tree to FTAP may specify the system state as any logical function of subsystem or component state variables or complements of these variables. When fault tree logical relations involve complements of state variables, the analyst may instruct FTAP to produce a family of prime implicants, a generalization of the minimal cut set concept. FTAP can also identify certain subsystems associated with the tree as system modules and provide a collection of minimal cut set families that essentially expresses the state of the system as a function of these module state variables. Another FTAP feature allows a subfamily to be obtained when the family of minimal cut sets or prime implicants is too large to be found in its entirety; this subfamily consists only of sets that are interesting to the analyst in a special sense

  8. A computer-aided molecular design framework for crystallization solvent design

    DEFF Research Database (Denmark)

    Karunanithi, Arunprakash T.; Achenie, Luke E.K.; Gani, Rafiqul

    2006-01-01

    , property requirements such as solubility, crystal morphology, flashpoint, toxicity, viscosity, normal boiling and melting point are posed as constraints. All the properties are estimated using group contribution methods. The MINLP model is then solved using a decomposition approach to obtain optimal......One of the key decisions in designing solution crystallization processes is the selection of solvents. In this paper, we present a computer-aided molecular design (CAMD) framework for the design and selection of solvents and/or anti-solvents for solution crystallization. The CAMD problem...... is formulated as a mixed integer nonlinear programming (MINLP) model. Although, the model allows any combination of performance objectives and property constraints, in the case studies, potential recovery was considered as the performance objective. The latter, needs to be maximized, while other solvent...

  9. Teaching Computer-Aided Design of Fluid Flow and Heat Transfer Engineering Equipment.

    Science.gov (United States)

    Gosman, A. D.; And Others

    1979-01-01

    Describes a teaching program for fluid mechanics and heat transfer which contains both computer aided learning (CAL) and computer aided design (CAD) components and argues that the understanding of the physical and numerical modeling taught in the CAL course is essential to the proper implementation of CAD. (Author/CMV)

  10. Computer Aided Design in Digital Human Modeling for Human Computer Interaction in Ergonomic Assessment: A Review

    Directory of Open Access Journals (Sweden)

    Suman Mukhopadhyay , Sanjib Kumar Das and Tania Chakraborty

    2012-12-01

    Full Text Available Research in Human-Computer Interaction (HCI hasbeen enormously successful in the area of computeraidedergonomics or human-centric designs. Perfectfit for people has always been a target for productdesign. Designers traditionally used anthropometricdimensions for 3D product design which created a lotof fitting problems when dealing with thecomplexities of the human body shapes. Computeraided design (CAD, also known as Computer aideddesign and drafting (CADD is the computertechnology used for the design processing and designdocumentation. CAD has now been used extensivelyin many applications such as automotive,shipbuilding, aerospace industries, architectural andindustrial designs, prosthetics, computer animationfor special effects in movies, advertising andtechnical manuals. As a technology, digital humanmodeling (DHM has rapidly emerged as atechnology that creates, manipulates and controlhuman representations and human-machine systemsscenes on computers for interactive ergonomic designproblem solving. DHM promises to profoundlychange how products or systems are designed, howergonomics analysis is performed, how disorders andimpairments are assessed and how therapies andsurgeries are conducted. The imperative andemerging need for the DHM appears to be consistentwith the fact that the past decade has witnessedsignificant growth in both the software systemsoffering DHM capabilities as well as the corporateadapting the technology.The authors shall dwell atlength and deliberate on how research in DHM hasfinally brought about an enhanced HCI, in thecontext of computer-aided ergonomics or humancentricdesign and discuss about future trends in thiscontext.

  11. Accelerating Design of Batteries Using Computer-Aided Engineering Tools (Presentation)

    Energy Technology Data Exchange (ETDEWEB)

    Pesaran, A.; Kim, G. H.; Smith, K.

    2010-11-01

    Computer-aided engineering (CAE) is a proven pathway, especially in the automotive industry, to improve performance by resolving the relevant physics in complex systems, shortening the product development design cycle, thus reducing cost, and providing an efficient way to evaluate parameters for robust designs. Academic models include the relevant physics details, but neglect engineering complexities. Industry models include the relevant macroscopic geometry and system conditions, but simplify the fundamental physics too much. Most of the CAE battery tools for in-house use are custom model codes and require expert users. There is a need to make these battery modeling and design tools more accessible to end users such as battery developers, pack integrators, and vehicle makers. Developing integrated and physics-based CAE battery tools can reduce the design, build, test, break, re-design, re-build, and re-test cycle and help lower costs. NREL has been involved in developing various models to predict the thermal and electrochemical performance of large-format cells and has used in commercial three-dimensional finite-element analysis and computational fluid dynamics to study battery pack thermal issues. These NREL cell and pack design tools can be integrated to help support the automotive industry and to accelerate battery design.

  12. Computer-aided design of bromelain and papain covalent immobilization

    Directory of Open Access Journals (Sweden)

    Bessy Cutiño-Avila

    2014-06-01

    Full Text Available Título en español: Diseño asistido por computadora de la inmovilización covalente de bromelina y papaína.Título corto: Computer-aided design of bromelain and papain. Abstract: Enzymes as immobilized derivatives have been widely used in Food, Agrochemical, Pharmaceutical and Biotechnological industries. Protein immobilization is probably the most used technology to improve the operational stability of these molecules. Bromelain (Ananas comosus and papain (Carica papaya are cystein proteases extensively used as immobilized biocatalyst with several applications in therapeutics, racemic mixtures resolution, affinity chromatography and others industrial scenarios. The aim of this work was to optimize the covalent immobilization of bromelain and papain via rational design of immobilized derivatives strategy (RDID and RDID1.0 program. It was determined the maximum protein quantity to immobilize, the optimum immobilization pH (in terms of functional activity retention, and the most probable configuration of the immobilized derivative and the probabilities of multipoint covalent attachment was also predicted. As support material Glyoxyl-Sepharose CL 4B was used.  The accuracy of RDID1.0 program´s prediction was demonstrated comparing with experimental results. Bromelain and papain immobilized derivatives showed desired characteristics for industrial biocatalysis, such as: elevate pH stability retaining 95% and 100% residual activity at pH 7.0 and 8.0, for bromelain and papain, respectively; high thermal stability at 30 °C retaining 90% residual activity for both immobilized enzymes; a catalytic configuration bonded by immobilization at optimal pH; and the ligand load achieved, ensures the minimization of diffusional restrictions.Key words: bromelain, covalent immobilization, immobilized derivatives, papain, rational design.Resumen: Las enzimas inmovilizadas han sido ampliamente utilizadas en las industrias Alimentaria, Agroquímica, Farmac

  13. An overview of interactive computer graphics and its application to computer-aided engineering and design

    International Nuclear Information System (INIS)

    The purpose of this brief birds-eye view of interactive graphics is to list the key ideas, and to show how one of the most important application areas, Computer Aided Engineering/Design takes advantage of it. (orig.)

  14. MVPACK: a package for the computer-aided design of multivariable control systems

    International Nuclear Information System (INIS)

    The design and analysis of high performing controllers for large complex plants require a collection of interactive, powerful computer software. MVPACK, an open-ended package for the computer aided design of control systems has been developed in the Reactor Control Branch of the Chalk River Nuclear Laboratories. The package is fully interactive, and includes a comprehensive state-of-the-art mathematical library to support development of complex multivariable control algorithms. Coded in RATFOR, MVPACK operates with a flexible data structure which makes efficient use of minicomputer resources and provides a standard framework for program generation. The existence of a help mechanism enhances the simplicity of package utilization. This report provides the technical description of the package. It reviews the specifications used in the design and implementation of the package. The database structure, the supporting libraries and the design and analysis modules of MVPACK are described. The report includes several application examples to illustrate the capability of the package. Experience with MVPACK shows that the package provides a synergistic environment for control and regulation systems design, and that it is a unique tool in training of control system engineers

  15. MVPACK: a computer-aided design tool for multivariable control systems

    International Nuclear Information System (INIS)

    The design and analysis of high-performance controllers for complex plants require a collection of interactive, powerful computer software. MVPACK, an open-ended package for the computer-aided design of control systems, has been developed in the Reactor Control Branch of the Chalk River Nuclear Laboratories. The package is fully interactive and includes a comprehensive state-of-the-art mathematical library to support development of complex, multivariable, control algorithms. Coded in RATFOR, MVPACK is portable with minimal changes. It operates with a flexible data structure which makes efficient use of minicomputer resources and provides a standard framework for program generation. The existence of a help mechanism enhances the simplicity of package utilization. This paper provides a brief tutorial overview of the package. It reviews the specifications used in the design and implementation of the package and briefly describes the database structure, supporting libraries and some design and analysis modules of MVPACK. Several application examples to illustrate the capability of the package are given. Experience with MVPACK shows that the package provides a synergistic environment for the design of control and regulation systems, and that it is a unique tool for training of control system engineers

  16. Software Performs Complex Design Analysis

    Science.gov (United States)

    2008-01-01

    Designers use computational fluid dynamics (CFD) to gain greater understanding of the fluid flow phenomena involved in components being designed. They also use finite element analysis (FEA) as a tool to help gain greater understanding of the structural response of components to loads, stresses and strains, and the prediction of failure modes. Automated CFD and FEA engineering design has centered on shape optimization, which has been hindered by two major problems: 1) inadequate shape parameterization algorithms, and 2) inadequate algorithms for CFD and FEA grid modification. Working with software engineers at Stennis Space Center, a NASA commercial partner, Optimal Solutions Software LLC, was able to utilize its revolutionary, one-of-a-kind arbitrary shape deformation (ASD) capability-a major advancement in solving these two aforementioned problems-to optimize the shapes of complex pipe components that transport highly sensitive fluids. The ASD technology solves the problem of inadequate shape parameterization algorithms by allowing the CFD designers to freely create their own shape parameters, therefore eliminating the restriction of only being able to use the computer-aided design (CAD) parameters. The problem of inadequate algorithms for CFD grid modification is solved by the fact that the new software performs a smooth volumetric deformation. This eliminates the extremely costly process of having to remesh the grid for every shape change desired. The program can perform a design change in a markedly reduced amount of time, a process that would traditionally involve the designer returning to the CAD model to reshape and then remesh the shapes, something that has been known to take hours, days-even weeks or months-depending upon the size of the model.

  17. Computer Aided Design of Transformer Station Grounding System Using CDEGS Software

    Directory of Open Access Journals (Sweden)

    S. Nikolovski

    2004-01-01

    Full Text Available This paper presents a computer-aided design of a transformer station grounding system. Fault conditions in a transformer station can produce huge damage to transformer station equipment if the grounding system is not designed properly. A well designed grounding system is a very important part of the project for transformer station design as a whole. This paper analyses a procedure for transformer grounding system design and spatial distribution of touch and step voltage on the ground surface level, using the CDEGS (Current Distribution Electromagnetic Interference Grounding and Soil Structure Analysis software. Spatial distribution is needed for checking and finding dangerous step and touch voltages above and around the transformer station. Apparent earth resistivity data is measured and analyzed using the RESAP module of the CDEGS software. Because of the very high current flow into the grounding system during a single line to ground fault or a three phase fault in the transformer station, very high and dangerous potentials can be induced on the metallic structures including the fence, which can cause dangerous situations for people and animals near the station and for the personnel inside the station. The PLOT module of CDEGS is used to view the results of the scalar potential, step and touch voltage on the surface. Graphic displays include equipotent contour lines and potential profiles (gradients in 3D and 2D perspective and apparent soil resistivity (Wm versus inter electrode spacing (m. The results of alternative grid designs may be displayed simultaneously for the purpose of comparison.

  18. Gender inequality, female leadership, and aid allocation: A panel analysis of aid for education

    OpenAIRE

    Kleemann, Linda; Nunnenkamp, Peter; Thiele, Rainer

    2014-01-01

    The aid allocation literature has neglected gender-specific needs for aid. We assess the hypothesis that gender inequality in education is more likely to affect the aid allocation of donor countries with female leadership in the relevant ministry. We find no evidence for a needs-based allocation of aid for education. Female as well as male leaders appear to have rewarded countries with more years of schooling of all children, or specifically of girls. Our estimates indicate just minor gender ...

  19. Firewall design and analysis

    CERN Document Server

    Liu, Alex X

    2010-01-01

    This unique book represents the first rigorous and comprehensive study of firewall policy design and analysis. Firewalls are the most critical and widely deployed intrusion prevention systems. Designing new firewall policies and analyzing existing firewall policies have been difficult and error-prone. This book presents scientifically sound and practically useful methods for designing and analyzing firewall policies. This book is useful to a variety of readers. First, it can be used as a handbook for network/firewall administrators and network security professionals. Second, it can be used as

  20. Ceramic tubesheet design analysis

    Energy Technology Data Exchange (ETDEWEB)

    Mallett, R.H.; Swindeman, R.W.

    1996-06-01

    A transport combustor is being commissioned at the Southern Services facility in Wilsonville, Alabama to provide a gaseous product for the assessment of hot-gas filtering systems. One of the barrier filters incorporates a ceramic tubesheet to support candle filters. The ceramic tubesheet, designed and manufactured by Industrial Filter and Pump Manufacturing Company (EF&PM), is unique and offers distinct advantages over metallic systems in terms of density, resistance to corrosion, and resistance to creep at operating temperatures above 815{degrees}C (1500{degrees}F). Nevertheless, the operational requirements of the ceramic tubesheet are severe. The tubesheet is almost 1.5 m in (55 in.) in diameter, has many penetrations, and must support the weight of the ceramic filters, coal ash accumulation, and a pressure drop (one atmosphere). Further, thermal stresses related to steady state and transient conditions will occur. To gain a better understanding of the structural performance limitations, a contract was placed with Mallett Technology, Inc. to perform a thermal and structural analysis of the tubesheet design. The design analysis specification and a preliminary design analysis were completed in the early part of 1995. The analyses indicated that modifications to the design were necessary to reduce thermal stress, and it was necessary to complete the redesign before the final thermal/mechanical analysis could be undertaken. The preliminary analysis identified the need to confirm that the physical and mechanical properties data used in the design were representative of the material in the tubesheet. Subsequently, few exploratory tests were performed at ORNL to evaluate the ceramic structural material.

  1. COMPUTER AIDED THREE DIMENSIONAL DESIGN OF MOLD COMPONENTS

    OpenAIRE

    Kerim ÇETİNKAYA; Hüdayim BAŞAK

    2000-01-01

    Sheet metal molding design with classical methods is formed in very long times calculates and drafts. At the molding design, selection and drafting of most of the components requires very long time because of similar repetative processes. In this study, a molding design program has been developed by using AutoLISP which has been adapted AutoCAD packet program. With this study, design of sheet metal molding, dimensioning, assemly drafting has been realized.

  2. COMPUTER AIDED THREE DIMENSIONAL DESIGN OF MOLD COMPONENTS

    Directory of Open Access Journals (Sweden)

    Kerim ÇETİNKAYA

    2000-02-01

    Full Text Available Sheet metal molding design with classical methods is formed in very long times calculates and drafts. At the molding design, selection and drafting of most of the components requires very long time because of similar repetative processes. In this study, a molding design program has been developed by using AutoLISP which has been adapted AutoCAD packet program. With this study, design of sheet metal molding, dimensioning, assemly drafting has been realized.

  3. Computer-aided design of stripline ferrite junction circulators

    Science.gov (United States)

    Uzdy, Z.

    1980-01-01

    A general design procedure is presented for stripline Y-junction circulators employing solid dielectric between ground planes. The resonator design and impedance matching are derived in a form suitable for computer evaluation. The procedure is applicable to cases where either the circulator bandwidth or the ground plane spacing is specified. An experimental S-band switching circulator design illustrates the technique.

  4. CSADP, a classical control system analysis and design package

    OpenAIRE

    Couture, Scott A.

    1985-01-01

    The Control System Analysis and Design Package (CSADP) is a computer-aided design package for applying classical control system analysis and design tools to experimental frequency response measurements. CSADP allows the user to analyze and manipulate measured frequency response data, design control systems using these measurements, and determine the operational amplifier hardware required to implement the design. To perform these tasks, CSADP provides tools that allow the us...

  5. Visualization analysis and design

    CERN Document Server

    Munzner, Tamara

    2015-01-01

    Visualization Analysis and Design provides a systematic, comprehensive framework for thinking about visualization in terms of principles and design choices. The book features a unified approach encompassing information visualization techniques for abstract data, scientific visualization techniques for spatial data, and visual analytics techniques for interweaving data transformation and analysis with interactive visual exploration. It emphasizes the careful validation of effectiveness and the consideration of function before form. The book breaks down visualization design according to three questions: what data users need to see, why users need to carry out their tasks, and how the visual representations proposed can be constructed and manipulated. It walks readers through the use of space and color to visually encode data in a view, the trade-offs between changing a single view and using multiple linked views, and the ways to reduce the amount of data shown in each view. The book concludes with six case stu...

  6. Creation of Anatomically Accurate Computer-Aided Design (CAD) Solid Models from Medical Images

    Science.gov (United States)

    Stewart, John E.; Graham, R. Scott; Samareh, Jamshid A.; Oberlander, Eric J.; Broaddus, William C.

    1999-01-01

    Most surgical instrumentation and implants used in the world today are designed with sophisticated Computer-Aided Design (CAD)/Computer-Aided Manufacturing (CAM) software. This software automates the mechanical development of a product from its conceptual design through manufacturing. CAD software also provides a means of manipulating solid models prior to Finite Element Modeling (FEM). Few surgical products are designed in conjunction with accurate CAD models of human anatomy because of the difficulty with which these models are created. We have developed a novel technique that creates anatomically accurate, patient specific CAD solids from medical images in a matter of minutes.

  7. CFD Aided Design and Optimization of Francis Turbine Runners

    Science.gov (United States)

    Ayancik, Fatma; Demirel, Gizem; Celebioglu, Kutay; Acar, Erdem; Aradag, Selin; ETU Hydro Research Center Team

    2014-11-01

    Francis turbines are commonly used for hydroelectric power plants with their wide range of flow rate and head values. They are composed of five main components and they generate energy with the help of the runner connected to the generator. Therefore, runner is the most important part of a Francis turbine. All components of turbines are linked and they are designed to maximize the turbine efficiency. The dimensions of the runner vary depending on the design discharge, head and the speed of the rotor of the generators. In this study, a design methodology is developed to design turbine runners with the help of computational fluid dynamics and is applied to the runner design of three different hydroelectric power plant turbines. Multi objective design optimization is also performed and the response surfaces are investigated to obtain maximum turbine efficiency and cavitation free design. This study is financially supported by Turkish Ministry of Development.

  8. Computer aided design around the A 300 Airbus

    International Nuclear Information System (INIS)

    More than thirteen years after the launching of the first AIRBUS development a survey of CAD/CAM introduction and operation at AEROSPATIALE, Aircraft Division, is conducted. The following points are reviewed: - short description of AEROSPATIALE Aircraft Division - technical level and limits reached with the Concorde programm - first CAD experience and the decision to proceed and generalize CAD/CAM techniques towards computer aided engineering (CAE) - CAE basic concepts. Then is shown the implementation of CAE in the structural, aerodynamic and electrical fields in response to the growing success of the various Airbus programs and in front of an everyday tougher competition. After a description of the to-day situation and a first estimate of CAE benefits, special attention is devoted to the difficulties encountered with both hardware and software used in the system involved. To conclude and attempt is made to define the respective roles of the system buyer and vendor in the CAD/CAM field. (orig.)

  9. Computer-aided Framework for Design of Pure, Mixed and Blended Products

    DEFF Research Database (Denmark)

    Cignitti, Stefano; Zhang, Lei; Gani, Rafiqul

    2015-01-01

    Design of novel chemical products with process and application considerations is an emerging topic in thefield of chemical and biochemical engineering. Methods, such as Computer Aided Molecular Design(CAMD) [1] and Computer-aided Mixture and Blend Design (CAMbD) [2], provide the possibility of...... metrics that must be included in today’s product designs, consequently makes the problem harder to mathematically formulate and to solve.In this work, a framework for computer-aided design of pure, mixed and blended chemical products hasbeen developed. The framework is a systematic approach to formulate...... and solve CAMbD problems throughfour sequential steps. In the first step, the needs, target properties and product type are defined. In the second step, the CAMbD is formulated together with objectives and process/application model. In the third step,the formulation is then converted into a mixed...

  10. Interpolation Filter Design for Hearing-Aid Audio Class-D Output Stage Application

    DEFF Research Database (Denmark)

    Pracný, Peter; Bruun, Erik; Muntal, Pere Llimós

    2012-01-01

    This paper deals with a design of a digital interpolation filter for a 3rd order multi-bit ΣΔ modulator with over-sampling ratio OSR = 64. The interpolation filter and the ΣΔ modulator are part of the back-end of an audio signal processing system in a hearing-aid application. The aim in this paper...... is to compare this design to designs presented in other state-of-the-art works ranging from hi-fi audio to hearing-aids. By performing comparison, trends and tradeoffs in interpolation filter design are indentified and hearing-aid specifications are derived. The possibilities for hardware reduction...... in the interpolation filter are investigated. Proposed design simplifications presented here result in the least hardware demanding combination of oversampling ratio, number of stages and number of filter taps among a number of filters reported for audio applications....

  11. Computer-Aided Design of Microstrip GaAs Mesfet Amplifiers

    DEFF Research Database (Denmark)

    Nielsen, Niels Ole

    1976-01-01

    Results on computer-aided design of broadband GaAs MESFET amplifiers in microstrip is presented. The analysis of an amplifier is based on measured scattering parameters and a model of the microstrip structure, which includes parasitics and junction effects. The optimized performance of one stage...... amplifiers with lossless distributed matching elements is presented. Realized amplifiers are in good agreement with the theory. One stage amplifiers with a 1 ¿m FET in chip form exhibit 5.8 dB of gain in the range 8-12 GHz, while a gain of 4.5 dB from 4-8 GHz has been obtained with a packaged 1 ¿m FET....

  12. CFD Aided Design and Production of Hydraulic Turbines

    Science.gov (United States)

    Kaplan, Alper; Cetinturk, Huseyin; Demirel, Gizem; Ayli, Ece; Celebioglu, Kutay; Aradag, Selin; ETU Hydro Research Center Team

    2014-11-01

    Hydraulic turbines are turbo machines which produce electricity from hydraulic energy. Francis type turbines are the most common one in use today. The design of these turbines requires high engineering effort since each turbine is tailor made due to different head and discharge. Therefore each component of the turbine is designed specifically. During the last decades, Computational Fluid Dynamics (CFD) has become very useful tool to predict hydraulic machinery performance and save time and money for designers. This paper describes a design methodology to optimize a Francis turbine by integrating theoretical and experimental fundamentals of hydraulic machines and commercial CFD codes. Specific turbines are designed and manufactured with the help of a collaborative CFD/CAD/CAM methodology based on computational fluid dynamics and five-axis machining for hydraulic electric power plants. The details are presented in this study. This study is financially supported by Turkish Ministry of Development.

  13. Computer-aided design of a catalyst for Edman degradation utilizing substrate-assisted catalysis

    OpenAIRE

    Borgo, Benjamin; Havranek, James J.

    2014-01-01

    Molecular biology has been revolutionized by the miniaturization and parallelization of DNA sequencing assays previously performed on bulk samples. Many of these technologies rely on biomolecular reagents to facilitate detection, synthesis, or labeling of samples. To aid in the construction of analogous experimental approaches for proteins and peptides, we have used computer-aided design to engineer an enzyme capable of catalyzing the cleavage step of the Edman degradation. We exploit the sim...

  14. Application of fuzzy logic in computer-aided design of digital systems

    Science.gov (United States)

    Shragowitz, Eugene B.; Lee, Jun-Yong; Kang, Eric Q.

    1996-06-01

    Application of fuzzy logic structures in computer-aided design (CAD) of electronic systems substantially improves quality of design solutions by providing designers with flexibility in formulating goals and selecting trade-offs. In addition, the following aspects of a design process are positively impacted by application of fuzzy logic: utilization of domain knowledge, interpretation of uncertainties in design data, and adaptation of design algorithms. We successfully applied fuzzy logic structures in conjunction with constructive and iterative algorithms for selecting of design solutions for different stages of the design process. We also introduced a fuzzy logic software development tool to be used in CAD applications.

  15. Computer aided seismic and fire retrofitting analysis of existing high rise reinforced concrete buildings

    CERN Document Server

    Hussain, Raja Rizwan; Hasan, Saeed

    2016-01-01

    This book details the analysis and design of high rise buildings for gravity and seismic analysis. It provides the knowledge structural engineers need to retrofit existing structures in order to meet safety requirements and better prevent potential damage from such disasters as earthquakes and fires. Coverage includes actual case studies of existing buildings, reviews of current knowledge for damages and their mitigation, protective design technologies, and analytical and computational techniques. This monograph also provides an experimental investigation on the properties of fiber reinforced concrete that consists of natural fibres like coconut coir and also steel fibres that are used for comparison in both Normal Strength Concrete (NSC) and High Strength Concrete (HSC). In addition, the authors examine the use of various repair techniques for damaged high rise buildings. The book will help upcoming structural design engineers learn the computer aided analysis and design of real existing high rise buildings ...

  16. Computer-aided roll pass design in rolling of airfoil shapes

    Science.gov (United States)

    Akgerman, N.; Lahoti, G. D.; Altan, T.

    1980-01-01

    This paper describes two computer-aided design (CAD) programs developed for modeling the shape rolling process for airfoil sections. The first program, SHPROL, uses a modular upper-bound method of analysis and predicts the lateral spread, elongation, and roll torque. The second program, ROLPAS, predicts the stresses, roll separating force, the roll torque and the details of metal flow by simulating the rolling process, using the slab method of analysis. ROLPAS is an interactive program; it offers graphic display capabilities and allows the user to interact with the computer via a keyboard, CRT, and a light pen. The accuracy of the computerized models was evaluated by (a) rolling a selected airfoil shape at room temperature from 1018 steel and isothermally at high temperature from Ti-6Al-4V, and (b) comparing the experimental results with computer predictions. The comparisons indicated that the CAD systems, described here, are useful for practical engineering purposes and can be utilized in roll pass design and analysis for airfoil and similar shapes.

  17. Systems Design Perspective of Healthcare Provision in Humanitarian Aid

    Directory of Open Access Journals (Sweden)

    Ana Laura Santos

    2014-12-01

    Full Text Available This study focuses on the role of Systems Design in addressing the challenges of healthcare provision by international emergency relief organizations in developing countries. More specifically the challenges related to the safety and performance of medical equipment that is transferred in the aftermath of a humanitarian crisis. The aim of this paper is to describe the transfer of medical equipment and its associated challenges from a systems perspective and to reflect on the value of Systems Design as an approach to humanitarian innovation, addressing the identified systemic challenges. The concepts of Human Factors and Ergonomics, and Product-Service Systems will be presented as valuable contributions to support designers in handling a larger degree of complexity throughout the design process and to support them to make informed choices regarding this particular context.

  18. WASTE REDUCTION USING COMPUTER-AIDED DESIGN TOOLS

    Science.gov (United States)

    Growing environmental concerns have spurred considerable interest in pollution prevention. In most instances, pollution prevention involves introducing radical changes to the design of processes so that waste generation is minimized.Process simulators can be effective tools i...

  19. Discuss the Development of Computer-Aided Industrial Design Technology

    Directory of Open Access Journals (Sweden)

    Jun Yao

    2013-01-01

    Full Text Available The direction of the development of the industrial design gradually approaches mechanical-electrical integration and informational and electronic products. With an increasing improvement of its technical content, and better social economic conditions, peoples consumption concept are getting more and more different. Consumer concerns not just the functionality and quality of the product, more and more people are starting to focus on the appearance of the product, degree of innovation, environmental protection, and so on, which brings a higher degree of difficulty to the industrial technology. It is because the increasing demands of people and the industrial design, many scholars are increasingly concerned about the industrial design in recent years. With the continuous development of computer technology, a wide variety of hardware and software are developed, and a variety of ever-changing technologies are attracting the industrial design talents as well.

  20. Computer aided hydraulic design of axial flow pump impeller

    International Nuclear Information System (INIS)

    Pumps are the heart of any power plant and hence their design requires great attention. Computers with their potential for rapid computation can be successfully employed in the design and manufacture of these machines. The paper discusses a program developed for the hydraulic design of axial flow pump impeller. The program, written in FORTRAN 77, is interactive and performs the functions of design calculation, drafting and generation of numerical data for blade manufacture. The drafting function, which makes use of the software ACAD, is carried out automatically by means of suitable interface programs. In addition data for blade manufacture is also generated in either the x-y-z or r-θ-z system. (author). 4 refs., 3 figs

  1. Evolutionary Algorithm Aided Interleaver Design for Serially Concatenated Codes

    OpenAIRE

    Maunder, R.G.; Hanzo, L

    2011-01-01

    In this paper, we propose an algorithm for designing the interleavers of Serially Concatenated Codes (SCCs), in order to increase the Minimum Hamming Distance (MHD) between the legitimate permutations of the encoded bit sequence and hence to improve the corresponding error floor. Unlike previous so-called Code Matched Interleaver (CMI) designs, our approach is capable of creating interleavers for serial concatenations of both irregular and non-linear codes, as well as achieving MHDs that are ...

  2. Integrating computer programs for engineering analysis and design

    Science.gov (United States)

    Wilhite, A. W.; Crisp, V. K.; Johnson, S. C.

    1983-01-01

    The design of a third-generation system for integrating computer programs for engineering and design has been developed for the Aerospace Vehicle Interactive Design (AVID) system. This system consists of an engineering data management system, program interface software, a user interface, and a geometry system. A relational information system (ARIS) was developed specifically for the computer-aided engineering system. It is used for a repository of design data that are communicated between analysis programs, for a dictionary that describes these design data, for a directory that describes the analysis programs, and for other system functions. A method is described for interfacing independent analysis programs into a loosely-coupled design system. This method emphasizes an interactive extension of analysis techniques and manipulation of design data. Also, integrity mechanisms exist to maintain database correctness for multidisciplinary design tasks by an individual or a team of specialists. Finally, a prototype user interface program has been developed to aid in system utilization.

  3. Computer Aided Design of Kaplan Turbine Piston with SolidWorks

    OpenAIRE

    Camelia Jianu

    2010-01-01

    The paper presents the steps for 3D computer aided design (CAD) of Kaplan turbine piston made in SolidWorks.The present paper is a tutorial for a Kaplan turbine piston 3D geometry, which is dedicaded to the Parts Sketch and Parts Features design and Drawing Geometry and Drawing Annotation.

  4. Three-dimensional computer aided design system for plant layout

    International Nuclear Information System (INIS)

    The CAD system for three-dimensional plant layout planning, with which the layout of pipings, cable trays, air conditioning ducts and so on in nuclear power plants can be planned and designed effectively in a short period is reported. This system comprises the automatic routing system by storing the rich experience and know-how of designers in a computer as the knowledge, and deciding the layout automatically following the predetermined sequence by using these, the interactive layout system for reviewing the routing results from higher level and modifying to the optimum layout, the layout evaluation system for synthetically evaluating the layout from the viewpoint of the operability such as checkup and maintenance, and the data base system which enables these effective planning and design. In this report, the total constitution of this system and the technical features and effects of the individual subsystems are outlined. In this CAD system for three-dimensional plant layout planning, knowledge engineering, CAD/CAM, computer graphics and other latest technology were introduced, accordingly by applying this system to plant design, the design can be performed quickly, various case studies can be carried out at planning stage, and systematic and optimum layout planning becomes possible. (Kako, I.)

  5. Financial Aid Tipping Points: An Analysis of Aid and Academic Achievement at a California Community College

    Science.gov (United States)

    Coria, Elizabeth; Hoffman, John L.

    2016-01-01

    The purpose of this study was to explore relationships between financial aid awards and measures of student academic achievement. Financial aid and academic records for 11,956 students attending an urban California community college were examined and analyzed using simultaneous linear regression and two-way factorial ANOVAs. Findings revealed a…

  6. Computer Aided Flowsheet Design using Group Contribution Methods

    DEFF Research Database (Denmark)

    Bommareddy, Susilpa; Eden, Mario R.; Gani, Rafiqul

    In this paper, a systematic group contribution based framework is presented for synthesis of process flowsheets from a given set of input and output specifications. Analogous to the group contribution methods developed for molecular design, the framework employs process groups to represent...

  7. Software tools to aid Pascal and Ada program design

    Energy Technology Data Exchange (ETDEWEB)

    Jankowitz, H.T.

    1987-01-01

    This thesis describes a software tool which analyses the style and structure of Pascal and Ada programs by ensuring that some minimum design requirements are fulfilled. The tool is used in much the same way as a compiler is used to teach students the syntax of a language, only in this case issues related to the design and structure of the program are of paramount importance. The tool operates by analyzing the design and structure of a syntactically correct program, automatically generating a report detailing changes that need to be made in order to ensure that the program is structurally sound. The author discusses how the model gradually evolved from a plagiarism detection system which extracted several measurable characteristics in a program to a model that analyzed the style of Pascal programs. In order to incorporate more-sophistical concepts like data abstraction, information hiding and data protection, this model was then extended to analyze the composition of Ada programs. The Ada model takes full advantage of facilities offered in the language and by using this tool the standard and quality of written programs is raised whilst the fundamental principles of program design are grasped through a process of self-tuition.

  8. Design Theory of Intellectualized Computer Aided Instruction and Its Applications

    Institute of Scientific and Technical Information of China (English)

    CUI Hong-bin; WANG Ai-min; YU Dong-mei

    2001-01-01

    This paper presents design theory and method of the intellectualized CAI. which includes the organization and expression of the teaching content and the teaching requirement determination in teaching process, and develops a highly intellectualized CA1 software. LA-CAI, to use for liner arithmetic teaching program.

  9. Systematic Computer-Aided Framework for Sustainable Chemical Product Design

    DEFF Research Database (Denmark)

    Cignitti, Stefano; Zhang, Lei; Kalakul, Sawitree;

    fluids used in heat pumps are continuously regulated due to the environmental issues, such as ozone depletion or global warming potential. Many of the currently used working fluids are soon to be phased out [4]. The design of novel working fluids is a challenging task as retro-fitting as well as re...

  10. Analysis and design for architecture-based software

    Institute of Scientific and Technical Information of China (English)

    Jia Xiaolin; He Jian; Qin Zheng; Wang Xianghua

    2005-01-01

    The technologies of software architecture are introduced, and the software analysis-and-design process is divided into requirement analysis, software architecture design and system design. Using these technologies, a model of architecture-centric software analysis and design process(ACSADP) is proposed. Meanwhile, with regard to the completeness, consistency and correctness between the software requirements and design results, the theories of function and process control are applied to ACSADP. Finally, a model of integrated development environment (IDE) for ACSADP is proposed. It can be demonstrated by the practice that the model of ACSADP can aid developer to manage software process effectively and improve the quality of software analysis and design.

  11. A common pharmacophoric footprint for AIDS vaccine design.

    Science.gov (United States)

    Pisterer, Christoph; Mihailescu, Dan; Smith, Jeremy C; Reed, Jennifer

    2004-07-15

    The most promising target antigen for an HIV vaccine designed using the classic antibody strategy has been the viral coat protein gp120. Unfortunately, its high variability has prevented this approach. We examine here a 15-residue peptide derived from the CD4-binding domain of gp120. By use of molecular dynamics computer simulation, it is shown that despite considerable sequence variation, the three-dimensional structure of the peptide is preserved over the full range of clade-specific sequences. Furthermore, sequences threaded onto the structure exhibit common three-dimensional electrostatic and hydrophobic properties. These common physicochemical characteristics constitute a pharmacophoric footprint that promises to be useful in the design of a synthetic antigen for vaccine development. PMID:15239651

  12. Online Design Aid for Evaluating Manure Pit Ventilation Systems to Reduce Entry Risk.

    Science.gov (United States)

    Manbeck, Harvey B; Hofstetter, Daniel W; Murphy, Dennis J; Puri, Virendra M

    2016-01-01

    On-farm manure storage pits contain both toxic and asphyxiating gases such as hydrogen sulfide, carbon dioxide, methane, and ammonia. Farmers and service personnel occasionally need to enter these pits to conduct repair and maintenance tasks. One intervention to reduce the toxic and asphyxiating gas exposure risk to farm workers when entering manure pits is manure pit ventilation. This article describes an online computational fluid dynamics-based design aid for evaluating the effectiveness of manure pit ventilation systems to reduce the concentrations of toxic and asphyxiating gases in the manure pits. This design aid, developed by a team of agricultural engineering and agricultural safety specialists at Pennsylvania State University, represents the culmination of more than a decade of research and technology development effort. The article includes a summary of the research efforts leading to the online design aid development and describes protocols for using the online design aid, including procedures for data input and for accessing design aid results. Design aid results include gas concentration decay and oxygen replenishment curves inside the manure pit and inside the barns above the manure pits, as well as animated motion pictures of individual gas concentration decay and oxygen replenishment in selected horizontal and vertical cut plots in the manure pits and barns. These results allow the user to assess (1) how long one needs to ventilate the pits to remove toxic and asphyxiating gases from the pit and barn, (2) from which portions of the barn and pit these gases are most and least readily evacuated, and (3) whether or not animals and personnel need to be removed from portions of the barn above the manure pit being ventilated. PMID:27303661

  13. Online Design Aid for Evaluating Manure Pit Ventilation Systems to Reduce Entry Risk

    Directory of Open Access Journals (Sweden)

    Harvey B. Manbeck

    2016-05-01

    Full Text Available On-farm manure storage pits contain both toxic and asphyxiating gases such as hydrogen sulfide, carbon dioxide, methane and ammonia. Farmers and service personnel occasionally need to enter these pits to conduct repair and maintenance tasks. One intervention to reduce the toxic and asphyxiating gas exposure risk to farm workers when entering manure pits is manure pit ventilation. This article describes an online computational fluid dynamics based design aid for evaluating the effectiveness of manure pit ventilation systems to reduce the concentrations of toxic and asphyxiating gases in the manure pits. This design aid, developed by a team of agricultural engineering and agricultural safety specialists at Pennsylvania State University, represents the culmination of more than a decade of research and technology development effort. The article includes a summary of the research efforts leading to the online design aid development and describes protocols for using the online design aid, including procedures for data input and for accessing design aid results. Design aid results include gas concentration decay and oxygen replenishment curves inside the manure pit and inside the barns above the manure pits, as well as animated motion pictures of individual gas concentration decay and oxygen replenishment in selected horizontal and vertical cut plots in the manure pits and barns. These results allow the user to assess: (1 how long one needs to ventilate the pits to remove toxic and asphyxiating gases from the pit and barn, (2 from which portions of the barn and pit these gases are most and least readily evacuated, and (3 whether or not animals and personnel need to be removed from portions of the barn above the manure pit being ventilated.

  14. COMPUTER AIDED DESIGN IN URBAN ARHITECTURE 3D MODELING

    OpenAIRE

    Nicolae Radu MARSANU; Silvia Mihaela RUSU

    2010-01-01

    The gap from the PC made sketches with the help of the china ink pen and ruler to the digitised drawing boards, high diagonal monitors and 3D projecting is truly spectacular. The increasingly efficient and more specialized programs allow the architects a whole range of facilities providing drawing commands and changes very easy to use, automatic rating, operating simultaneously in multiple windows, building sections and extracts of the plan, 3D views design and even projecting in virtual real...

  15. Invariant EKF Design for Scan Matching-aided Localization

    OpenAIRE

    Barczyk, Martin; Bonnabel, Silvère; Deschaud, Jean-Emmanuel; Goulette, François

    2015-01-01

    International audience Localization in indoor environments is a technique that estimates the robot's pose by fusing data from onboard motion sensors with readings of the environment, in our case obtained by scan matching point clouds captured by a low-cost Kinect depth camera. We develop both an invariant extended Kalman filter (IEKF)-based and a multiplicative extended Kalman filter-based solution to this problem. The two designs are successfully validated in experiments and demonstrate t...

  16. Model checking as an aid to procedure design

    International Nuclear Information System (INIS)

    The OECD Halden Reactor Project has been actively working on computer assisted operating procedures for many years. The objective of the research has been to provide computerised assistance for procedure design, verification and validation, implementation and maintenance. For the verification purpose, the application of formal methods has been considered in several reports. The recent formal verification activity conducted at the Halden Project is based on using model checking to the verification of procedures. This report presents verification approaches based on different model checking techniques and tools for the formalization and verification of operating procedures. Possible problems and relative merits of the different approaches are discussed. A case study of one of the approaches is presented to show the practical application of formal verification. Application of formal verification in the traditional procedure design process can reduce the human resources involved in reviews and simulations, and hence reduce the cost of verification and validation. A discussion of the integration of the formal verification with the traditional procedure design process is given at the end of this report. (Author)

  17. Computer aided design of fast neutron therapy units

    International Nuclear Information System (INIS)

    Conceptual design of a radiation-therapy unit using fusion neutrons is presently being considered by KMS Fusion, Inc. As part of this effort, a powerful and versatile computer code, TBEAM, has been developed which enables the user to determine physical characteristics of the fast neutron beam generated in the facility under consideration, using certain given design parameters of the facility as inputs. TBEAM uses the method of statistical sampling (Monte Carlo) to solve the space, time and energy dependent neutron transport equation relating to the conceptual design described by the user-supplied input parameters. The code traces the individual source neutrons as they propagate throughout the shield-collimator structure of the unit, and it keeps track of each interaction by type, position and energy. In its present version, TBEAM is applicable to homogeneous and laminated shields of spherical geometry, to collimator apertures of conical shape, and to neutrons emitted by point sources or such plate sources as are used in neutron generators of various types. TBEAM-generated results comparing the performance of point or plate sources in otherwise identical shield-collimator configurations are presented in numerical form. (H.K.)

  18. Computer aided design of reentrant coaxial filters including coaxial excitation

    NARCIS (Netherlands)

    Boria, V.; Gerini, G.; Guglielmi, M.

    1999-01-01

    An advanced EM based CAD tool is used for the detailed characterisation of a family of reentrant coaxial waveguide filters. The EM analysis includes the effects of tuning screws and of the input/output coaxial excitation. The software is essentially used as an efficient replacement for the tradition

  19. Computer-aided strength analysis of the modernized freight wagon

    Science.gov (United States)

    Płaczek, M.; Wróbel, A.; Baier, A.

    2015-11-01

    In the paper results of computer-aided strength analysis of the modernized freight wagon based on Finite Element Method are presented. CAD model of the considered freight wagon was created and its strength was analysed in agreement with norms described the way of such kind of freight wagons testing. Then, the model of the analysed freight wagon was modernized by adding composite panels covering the inner surface of the vehicle body. Strength analysis was carried out once again and obtained results were juxtaposed. This work was carried out in order to verify the influence of composite panels on the strength of the freight car body and to estimate the possibility of reducing the steel shell thickness of the box in order to reduce weight of the freight wagon.

  20. Computer Aided Design of Computer Generated Holograms for electron beam fabrication

    Science.gov (United States)

    Urquhart, Kristopher S.; Lee, Sing H.; Guest, Clark C.; Feldman, Michael R.; Farhoosh, Hamid

    1989-01-01

    Computer Aided Design (CAD) systems that have been developed for electrical and mechanical design tasks are also effective tools for the process of designing Computer Generated Holograms (CGHs), particularly when these holograms are to be fabricated using electron beam lithography. CAD workstations provide efficient and convenient means of computing, storing, displaying, and preparing for fabrication many of the features that are common to CGH designs. Experience gained in the process of designing CGHs with various types of encoding methods is presented. Suggestions are made so that future workstations may further accommodate the CGH design process.

  1. Preparing of aids for practical design of reinforced concrete elements according to EUROCODE 2

    OpenAIRE

    Ramadan, Ersan

    2014-01-01

    The thesis deals with the preparing of the aids for the design of reinforced concrete single symmetric cross-sections according to Eurocode 2 standard. Expressions for the design of cross-sections with respect to combined bending moment and axial force, shear and torsion are given. The work is divided into three parts. The first part presents expressions for the determination of the coefficients for the preparation of tables for the design of cross-sections with respect to combined bending...

  2. Implementation Methods of Computer Aided Design-Drawing and Drawing Management for Plate Cutting-Machine

    Institute of Scientific and Technical Information of China (English)

    DONG Yu-de; ZHAO Han; TAN Jian-rong

    2002-01-01

    The implementation methods of computer aided design,drawing and drawing management for plate cuttingmachine are discussed. The system structure for plate cutting- machine design is put forward firstly, then some key technologies and their implementation methods are introduced, which include the structure management of graphics, the unification of graph and design calculation, information share of part, assemble and drawing management system, and movement simulation of key components.

  3. Computer-Aided Design, Modeling and Simulation of a New Solar Still Design

    Directory of Open Access Journals (Sweden)

    Jeremy (Zheng Li

    2011-01-01

    Full Text Available The clean and pure drinking water is important in today's life but current water sources are usually brackish with bacteria that cannot be used for drinking. About 78% of water available in the sea is salty, 21% of water is brackish, and only 1% of water is fresh. Distillation is one of the feasible processes applied to water purification, and it requires the energy inputs, such as solar radiation. Water is evaporated in this distillation process and water vapor can be separated and condensed to pure water. Now, with the change from conventional fuels to renewable and environment friendly fuels sources, the modern technology allows to use the abundant energy from the sun. It is better to use solar energy to process the water desalination since it is more economical than the use of conventional energies. The main focus of this paper is applying computer-aided modeling and simulation to design a less complex solar water distillation system. The prototype of this solar still system is also built to verify its feasibility, functionality, and reliability. The computational simulation and prototype testing show the reliability and proper functionality of this solar water distillation system.

  4. CAGD - Computer Aided Gripper Design for a Flexible Gripping System

    OpenAIRE

    Bernd Kuhlenkoetter; Michael Sdahl

    2005-01-01

    This paper is a summary of the recently accomplished research work on flexible gripping systems. The goal is to develop a gripper which can be used for a great amount of geometrically variant workpieces. The economic aspect is of particular importance during the whole development. The high flexibility of the gripper is obtained by three parallel used principles. These are human and computer based analysis of the gripping object as well as mechanical adaptation of the gripper to the object wit...

  5. The Development of Computer-Aided Design for Electrical Equipment Selection and Arrangement of 10 Kv Switchgear

    OpenAIRE

    Chernaya Anastassiya; Sokolova Elvira

    2015-01-01

    The paper intends to give an overview of a computer-aided design program application. The research includes two main parts: the development of a computer-aided design for an appropriate switchgear selection and its arrangement in an indoor switchgear layout. Matlab program was used to develop a computer-aided design system. The use of this program considerably simplifies the selection and arrangement of 10 kV switchgear.

  6. GBuilder-computer aided design of detector geometry

    International Nuclear Information System (INIS)

    Many tasks typical for High Energy Physics such as simulation, event display, maintenance of the geometry database of an experiment, require input of geometrical data. To simplify the process of preparation of such kinds of data an interactive graphics tool GBuilder is being developed. Definition of the geometry model in GBuilder is based on the Constructive Solid Geometry approach where objects are defined using boolean operations on basic shapes. To provide parameterization of the model arithmetic expressions may be used in place of numbers. A wide list of predefined materials is also available. Different drivers allow to output the geometry model in a form suitable for specific simulation or visual analysis tools

  7. Computer aided engineering for injection mould cooling system design

    OpenAIRE

    Moran, Niall

    1998-01-01

    The time taken in the cooling stage, of a typical injection moulding cycle, is a large factor in the productivity and efficiency of a plastic manufacturing process, and for this reason, must be minimised. In order to do this a cooling system is employed throughout the mould core. This thesis describes the development and implementation of a PC based analysis system that can be used to optimise the size and position of injection mould cooling systems. The software is fully ‘32-Bit’, operat...

  8. The future of computer-aided design and engineering at CERN

    CERN Document Server

    Høimyr, Nils-Joar

    2004-01-01

    This working note discusses design and engineering processes at CERN and Computer Aided Design and Engineering tools. The main focus of this note is Mechanical design and CAE activities and how to share and organize the data produced by CAD/CAE tools. These issues cannot be addressed without taking a global view of the engineering activities at CERN. As more and more of the detailed design work is done by external suppliers, the design processes at CERN change. Traditional design work where draftsmen are producing drawings on the request from engineers is replaced by conceptual design work done by domain specialists and engineers. Furthermore CAD and FEM tools have evolved from specialist tools to mainstream utilities mastered by most engineers. Design activities nowadays can now be carried out directly by the project engineer without the use of a design (drawing) office. This environment poses different requirements for design- and engineering support activities as well as the selection of CAE-tools. Design ...

  9. Types of Hearing Aids

    Science.gov (United States)

    ... Devices Consumer Products Hearing Aids Types of Hearing Aids Share Tweet Linkedin Pin it More sharing options ... some features for hearing aids? What are hearing aids? Hearing aids are sound-amplifying devices designed to ...

  10. Computer-Aided Design Method of Warp-Knitted Jacquard Spacer Fabrics

    Directory of Open Access Journals (Sweden)

    Li Xinxin

    2016-06-01

    Full Text Available Based on a further study on knitting and jacquard principles, this paper presents a mathematical design model to make computer-aided design of warp-knitted jacquard spacer fabrics more efficient. The mathematical model with matrix method employs three essential elements of chain notation, threading and Jacquard designing. With this model, the processing to design warp-knitted jacquard spacer fabrics with CAD software is also introduced. In this study, the sports shoes which have separated functional areas according to the feet structure and characteristics of movement are analysed. The results show the different patterns on Jacquard spacer fabrics that are seamlessly stitched with jacquard technics. The computer-aided design method of warp-knitted jacquard spacer fabrics is efficient and simple.

  11. Monte Carlo aided enhanced design of an neutron scatterometer

    International Nuclear Information System (INIS)

    This paper will present a particular example for the use of the Monte Carlo Method to enhance the performance of a neutron scatterometer, currently employed to detect the void fraction in fast-transient high-pressure water-vapour flow in a rod-bundle channel. The scatterometer relies on measuring the slowing-down of californium-252 neutrons by the hydrogen in the water to determine the liquid, hence vapour (void) content. However, californium-252 is a relatively fast-decaying source and alternative isotopic sources are typically too energetic to provide sufficient moderation given the small amount of liquid in the channel. Monte Carlo simulation were utilized to examine various design enhancement possibilities, including: filtering out unthermalized fast neutrons, amplifying by a fissionable material the amount of detected thermal neutrons, adding a dissolvable contrast material to the liquid phase, or relying on the scattering of fast neutrons by oxygen in water. In addition, methods to determine the distribution of the pattern of liquid-vapour phase in the channel are devised

  12. GBuilder—Computer Aided design of Detector Geometry

    Institute of Scientific and Technical Information of China (English)

    E.Tcherniasv; N.Smirnov

    2001-01-01

    Many tasks typical for High Energy Physics such as simulation,event display,maintenance of the geometry database of an experiment,require input of geometrical data.To simplify the process of preparation of such kinds of data an interactive graphica tool GBuilder is being develogped.Definition of the geometry model in GBuilder is based on the Constructive Solid Geometry approach where objects are defined using boolean operations on basic shapes.To provids parameterization of the model arithmetic expressions may be used in place of numbers,A wide list of predefined materials is also available.Different drivers allow to output the geometry model in a form suitable for specific simulation of visual analysis tools.

  13. Sound Classification in Hearing Aids Inspired by Auditory Scene Analysis

    Directory of Open Access Journals (Sweden)

    Allegro Silvia

    2005-01-01

    Full Text Available A sound classification system for the automatic recognition of the acoustic environment in a hearing aid is discussed. The system distinguishes the four sound classes "clean speech," "speech in noise," "noise," and "music." A number of features that are inspired by auditory scene analysis are extracted from the sound signal. These features describe amplitude modulations, spectral profile, harmonicity, amplitude onsets, and rhythm. They are evaluated together with different pattern classifiers. Simple classifiers, such as rule-based and minimum-distance classifiers, are compared with more complex approaches, such as Bayes classifier, neural network, and hidden Markov model. Sounds from a large database are employed for both training and testing of the system. The achieved recognition rates are very high except for the class "speech in noise." Problems arise in the classification of compressed pop music, strongly reverberated speech, and tonal or fluctuating noises.

  14. Computer-aided design of a proton pump

    Science.gov (United States)

    New, Michael H.; Pohorille, Andrew; Chang, Sherwood (Technical Monitor)

    1997-01-01

    The use of transmembrane proton gradients in energy transduction is an almost universal feature of life on earth. These proton gradients are established and maintained by specialized assemblies of proteins which actively pump protons across membranes. One broad class of proton pumps uses captured light energy to drive the proton pumping. Our goal is to elucidate the minimum structural requirements of a light-driven proton-pump. There are two basic components to a simple light-driven proton pump: a source of photo-generated protons and a "gate-keeper" which prevents these protons from reattaching themselves to their source. A wide variety of molecules in the membrane, even as simple as polycyclic aromatic hydrocarbons, are capable of releasing protons when illuminated. Our work is therefore focused on the design of the "gate-keeper." Our initial model involves a pair of proton acceptors, coupled to each other by a transient water bridge, and supported in the membrane by a small bundle of peptide helices. Upon illumination, the proton source transfers its proton to the:- first acceptor of the gate-keeper. While the reverse reaction is highly probable, all that is needed to ensure irreversibility is a nonvanishing probability that the proton will be transferred to the second acceptor across a transient water bridge. Back transfer of the proton to the first acceptor, and thence to the proton source, is impeded by the free energy required to move the proton uphill towards the. proton source and by the disruption of the transient water bridge. As a prototypical water-bridged proton transfer system, we are studying the transfer of a proton across a water bridge from a formic acid to a formate anion. With a pK(sub alpha), of 3.7. formic acid is a good model for the acidic amino acids glutamate and aspartate which are good candidates for gate-keeper proton acceptors. Simulations of proton transfer reactions in a membrane are complicated by the quantum mechanical nature of

  15. Gathering Empirical Evidence Concerning Links between Computer Aided Design (CAD) and Creativity

    Science.gov (United States)

    Musta'amal, Aede Hatib; Norman, Eddie; Hodgson, Tony

    2009-01-01

    Discussion is often reported concerning potential links between computer-aided designing and creativity, but there is a lack of systematic enquiry to gather empirical evidence concerning such links. This paper reports an indication of findings from other research studies carried out in contexts beyond general education that have sought evidence…

  16. Web-Based Learning in the Computer-Aided Design Curriculum.

    Science.gov (United States)

    Sung, Wen-Tsai; Ou, S. C.

    2002-01-01

    Applies principles of constructivism and virtual reality (VR) to computer-aided design (CAD) curriculum, particularly engineering, by integrating network, VR and CAD technologies into a Web-based learning environment that expands traditional two-dimensional computer graphics into a three-dimensional real-time simulation that enhances user…

  17. Improving a Student's Reading Comprehension Skills by Teaching Computer Aided Design.

    Science.gov (United States)

    Bentivolio, Kerry

    A serendipitous observation resulted in an examination of the effectiveness of using a computer aided design course to improve high school student's strategic reading skills. Conducted in a 3 month semester period, the study relied on teacher observations, student questionnaires, and personal interviews. More than 75% of the students in the…

  18. The Journal of Computer-Aided Molecular Design: a bibliometric note

    OpenAIRE

    Willett, P.

    2012-01-01

    Summarizes the articles in, and the citations to, volumes 2-24 of the Journal of Computer-Aided Molecular Design. The citations to the journal come from almost 2000 different sources that span a very wide range of academic subjects, with the most heavily cited articles being descriptions of software systems and of computational methods.

  19. Technology and Jobs: Computer-Aided Design. Numerical-Control Machine-Tool Operators. Office Automation.

    Science.gov (United States)

    Stanton, Michael; And Others

    1985-01-01

    Three reports on the effects of high technology on the nature of work include (1) Stanton on applications and implications of computer-aided design for engineers, drafters, and architects; (2) Nardone on the outlook and training of numerical-control machine tool operators; and (3) Austin and Drake on the future of clerical occupations in automated…

  20. The Design, Implementation, and Formative Evaluation of a Classroom Aide Professional Development Training Program

    Science.gov (United States)

    Dulfer, Katherine J.

    2013-01-01

    This dissertation focused on the process of designing, implementing, and formatively evaluating an eight week Classroom Aide Professional Development Training Program (CAPD-TP) on behavior management and academic instruction within the context of a New Jersey state approved private special education school for students with behavioral and/or…

  1. The methodology of computer-aided design of means of measuring the integral purpose

    Directory of Open Access Journals (Sweden)

    В.П. Бабак

    2007-02-01

    Full Text Available  In article is offered a principle of building and achievement of a technical devises of technological parameters control of travel, location, speed etc on basis of computer-aided design system methods is developed of authors.

  2. The future of computer-aided sperm analysis

    Science.gov (United States)

    Mortimer, Sharon T; van der Horst, Gerhard; Mortimer, David

    2015-01-01

    Computer-aided sperm analysis (CASA) technology was developed in the late 1980s for analyzing sperm movement characteristics or kinematics and has been highly successful in enabling this field of research. CASA has also been used with great success for measuring semen characteristics such as sperm concentration and proportions of progressive motility in many animal species, including wide application in domesticated animal production laboratories and reproductive toxicology. However, attempts to use CASA for human clinical semen analysis have largely met with poor success due to the inherent difficulties presented by many human semen samples caused by sperm clumping and heavy background debris that, until now, have precluded accurate digital image analysis. The authors review the improved capabilities of two modern CASA platforms (Hamilton Thorne CASA-II and Microptic SCA6) and consider their current and future applications with particular reference to directing our focus towards using this technology to assess functional rather than simple descriptive characteristics of spermatozoa. Specific requirements for validating CASA technology as a semi-automated system for human semen analysis are also provided, with particular reference to the accuracy and uncertainty of measurement expected of a robust medical laboratory test for implementation in clinical laboratories operating according to modern accreditation standards. PMID:25926614

  3. The future of computer-aided sperm analysis

    Directory of Open Access Journals (Sweden)

    Sharon T Mortimer

    2015-01-01

    Full Text Available Computer-aided sperm analysis (CASA technology was developed in the late 1980s for analyzing sperm movement characteristics or kinematics and has been highly successful in enabling this field of research. CASA has also been used with great success for measuring semen characteristics such as sperm concentration and proportions of progressive motility in many animal species, including wide application in domesticated animal production laboratories and reproductive toxicology. However, attempts to use CASA for human clinical semen analysis have largely met with poor success due to the inherent difficulties presented by many human semen samples caused by sperm clumping and heavy background debris that, until now, have precluded accurate digital image analysis. The authors review the improved capabilities of two modern CASA platforms (Hamilton Thorne CASA-II and Microptic SCA6 and consider their current and future applications with particular reference to directing our focus towards using this technology to assess functional rather than simple descriptive characteristics of spermatozoa. Specific requirements for validating CASA technology as a semi-automated system for human semen analysis are also provided, with particular reference to the accuracy and uncertainty of measurement expected of a robust medical laboratory test for implementation in clinical laboratories operating according to modern accreditation standards.

  4. Low-floor bus design preferences of walking aid users during simulated boarding and alighting.

    Science.gov (United States)

    D'souza, Clive; Paquet, Victor; Lenker, James; Steinfeld, Edward; Bareria, Piyush

    2012-01-01

    Low-floor buses represent a significant improvement in accessible public transit for passengers with limited mobility. However, there is still a need for research on the inclusive design of transit buses to identify specific low-floor bus design conditions that are either particularly accommodating or challenging for passengers with functional and mobility impairments. These include doorway locations, seating configuration and the large front wheel-well covers that collectively impact boarding, alighting and interior movement of passengers. Findings from a laboratory study using a static full-scale simulation of a lowfloor bus to evaluate the impact of seating configuration and crowding on interior movement and accessibility for individuals with and without walking aids are presented (n=41). Simulated bus journeys that included boarding, fare payment, seating, and alighting were performed. Results from video observations and subjective assessments showed differences in boarding and alighting performance and users' perceptions of task difficulty. The need for assistive design features (e.g. handholds, stanchions), legroom and stowage space for walking aids was evident. These results demonstrate that specific design conditions in low-floor buses can significantly impact design preference among those who use walking aids. Consideration of ergonomics and inclusive design can therefore be used to improve the design of low-floor buses. PMID:22317485

  5. Computer-aided Nonlinear Control System Design Using Describing Function Models

    CERN Document Server

    Nassirharand, Amir

    2012-01-01

    A systematic computer-aided approach provides a versatile setting for the control engineer to overcome the complications of controller design for highly nonlinear systems. Computer-aided Nonlinear Control System Design provides such an approach based on the use of describing functions. The text deals with a large class of nonlinear systems without restrictions on the system order, the number of inputs and/or outputs or the number, type or arrangement of nonlinear terms. The strongly software-oriented methods detailed facilitate fulfillment of tight performance requirements and help the designer to think in purely nonlinear terms, avoiding the expedient of linearization which can impose substantial and unrealistic model limitations and drive up the cost of the final product. Design procedures are presented in a step-by-step algorithmic format each step being a functional unit with outputs that drive the other steps. This procedure may be easily implemented on a digital computer with example problems from mecha...

  6. 78 FR 3427 - Motorola Mobility LLC and Google Inc.; Analysis of Proposed Consent Order To Aid Public Comment

    Science.gov (United States)

    2013-01-16

    ... Avenue NW., Washington, DC 20580. Correction In the Federal Register of January 11, 2013, in FR Doc. 2013... Motorola Mobility LLC and Google Inc.; Analysis of Proposed Consent Order To Aid Public Comment AGENCY... comment a Complaint and Order against Google Inc. (``Google'') designed to remedy Google's...

  7. Computational Fluid Dynamics Aided Design of Stirred Liquid-Liquid Extraction Columns

    OpenAIRE

    Hlawitschka, Mark

    2013-01-01

    Aim of this work was the extension and development of a coupled Computational Fluid Dynamics (CFD) and population balance model (PBM) solver to enable a simulation aided design of stirred liquid-liquid extraction columns. The principle idea is to develop a new design methodology based on a CFD-PBM approach and verify it with existing data and correlations. On this basis, the separation performance in any apparatus geometry should be possible to predict without any experimental input. Reliable...

  8. Computer-aided design of repairs of buildings and the engineering infrastructure

    OpenAIRE

    Volkov Andrey Anatolevich; Yarulin Rustam Nazipovich

    2012-01-01

    The authors argue that the design development procedure and the technology-based preparation for the renovation of buildings and the engineering infrastructure are to be considered as a comprehensive process to be automated. One of the main problems that accompany the process of budgeting and scheduling of renovation projects consists in incidental expenses for extra repairs, as they are difficult to project. The authors suggest developing a specialized computer aided design sy...

  9. Human Factors of Integrating Speech and Manual Input Devices: The Case of Computer Aided Design

    OpenAIRE

    Khalid, H. M.

    1990-01-01

    The thesis investigates integrating the use of speech input and manual input devices in human-computer systems. The domain of computer aided design (CAD) is used as a case study. A methodology for empirical evaluation of CAD systems is presented. The methodology is based on a framework that describes the input/output processes presumed to underlie performance in design activities, using behaviour protocols and performance indices as data. For modelling system behaviour, a framework d...

  10. 75 FR 48686 - Tops Markets LLC; Analysis of Agreement Containing Consent Orders to Aid Public Comment

    Science.gov (United States)

    2010-08-11

    ... Tops Markets LLC; Analysis of Agreement Containing Consent Orders to Aid Public Comment AGENCY: Federal... methods of competition. The attached Analysis to Aid Public Comment describes both the allegations in the... Commission, has been placed on the public record for a period of thirty (30) days. The following Analysis...

  11. Computer-aided photometric analysis of dynamic digital bioluminescent images

    Science.gov (United States)

    Gorski, Zbigniew; Bembnista, T.; Floryszak-Wieczorek, J.; Domanski, Marek; Slawinski, Janusz

    2003-04-01

    The paper deals with photometric and morphologic analysis of bioluminescent images obtained by registration of light radiated directly from some plant objects. Registration of images obtained from ultra-weak light sources by the single photon counting (SPC) technique is the subject of this work. The radiation is registered by use of a 16-bit charge coupled device (CCD) camera "Night Owl" together with WinLight EG&G Berthold software. Additional application-specific software has been developed in order to deal with objects that are changing during the exposition time. Advantages of the elaborated set of easy configurable tools named FCT for a computer-aided photometric and morphologic analysis of numerous series of quantitatively imperfect chemiluminescent images are described. Instructions are given how to use these tools and exemplified with several algorithms for the transformation of images library. Using the proposed FCT set, automatic photometric and morphologic analysis of the information hidden within series of chemiluminescent images reflecting defensive processes in poinsettia (Euphorbia pulcherrima Willd) leaves affected by a pathogenic fungus Botrytis cinerea is revealed.

  12. Meshfree analysis with the aid of NURBS boundary

    Science.gov (United States)

    Chi, Sheng-Wei; Lin, Shih-Po

    2016-05-01

    We present a meshfree analysis framework to integrate the geometric exactness of non-uniform rational B-splines (NURBS)-based isogeometric analysis (IGA) (Hughes et al., Comput Methods Appl Mech Eng 194:4135-4195, 2005) with the flexibility of meshfree approximations. In the framework, only the NURBS boundary surface immediately available from CAD tools is used to describe the exact problem domain, and meshfree particles are inserted inside the boundary surface, in a flexible manner, for construction of the approximation for analysis. Nitche's method is employed for imposing essential boundary conditions and the domain integration in the Galerkin formulation is performed based on variationally consistent integration (VCI) to recover integration exactness. The NURBS boundary surface from CAD serves as an aid in selecting particle distributions and as the integration net for the boundary integration required both for the Nitche's method and the VCI. As shown in numerical studies, the VCI is essential for the solution accuracy of the method. Several benchmarks are tested to examine the effectiveness of the proposed framework and numerical results are compared with those obtained by the IGA.

  13. Tailor-made Design of Chemical Blends using Decomposition-based Computer-aided Approach

    DEFF Research Database (Denmark)

    Yunus, Nor Alafiza; Manan, Zainuddin Abd.; Gernaey, Krist;

    (properties). In this way, first the systematic computer-aided technique establishes the search space, and then narrows it down in subsequent steps until a small number of feasible and promising candidates remain and then experimental work may be conducted to verify if any or all the candidates satisfy the...... desired properties of the product as design constraints. The blend design problem is solved using a decomposition approach, which eliminates infeasible and/or redundant candidates gradually. The decomposition method reduces the search space in a systematic way. This general blend design problem is...... for use in internal combustion engines. The blend design formulation is able to find the optimal blend candidate....

  14. Applying New Computer-Aided Tools for Wind Farm Planning and Environmental Impact Analysis

    Energy Technology Data Exchange (ETDEWEB)

    Lybech Thoegersen, Morten; Nielsen, Per; Soerensen, Mads V. [Energi- og Miljoedata (EMD) Aalborg (Denmark); Toppenberg, Per [County of Northern Jutland, Aalborg (Denmark); Soee Christiansen, Erik [Municipality of Nibe, Nibe (Denmark)

    2005-07-01

    The demand for an environmental impact analysis (environmental assessment study) in any major Danish wind farm project has initiated the development for a set of computer-aided tools for wind turbine planning purposes. This paper gives an introduction to the newly developed computer-aided tools integrated in the wind farm design and planning tool WindPRO. The new module WindPLAN includes three interrelated spatial planning models: a weighted visibility calculation model, a conflict check calculation and a wind resource weighted planning module. The application of the models is exemplified through a case study covering the municipality of Nibe - situated in the Northern Jutland, Denmark. The different analysis are heavily dependent on detailed GIS-data - showing objects such as local housing, leisure areas, preservation areas etc. Finally, a brief presentation of other valuable computer-aided tools integrated in the WindPRO/WindPLAN module is given, such as rendering of terrain profiles, user defined map composing and saved pollution calculation.

  15. Influence of different luting protocols on shear bond strength of computer aided design/computer aided manufacturing resin nanoceramic material to dentin

    OpenAIRE

    Claudio Poggio; Marco Pigozzo; Matteo Ceci; Andrea Scribante; Riccardo Beltrami; Marco Chiesa

    2016-01-01

    Background: The purpose of this study was to evaluate the influence of three different luting protocols on shear bond strength of computer aided design/computer aided manufacturing (CAD/CAM) resin nanoceramic (RNC) material to dentin. Materials and Methods: In this in vitro study, 30 disks were milled from RNC blocks (Lava Ultimate/3M ESPE) with CAD/CAM technology. The disks were subsequently cemented to the exposed dentin of 30 recently extracted bovine permanent mandibular incisors. The...

  16. Development of the engineering design integration (EDIN) system: A computer aided design development

    Science.gov (United States)

    Glatt, C. R.; Hirsch, G. N.

    1977-01-01

    The EDIN (Engineering Design Integration) System which provides a collection of hardware and software, enabling the engineer to perform man-in-the-loop interactive evaluation of aerospace vehicle concepts, was considered. Study efforts were concentrated in the following areas: (1) integration of hardware with the Univac Exec 8 System; (2) development of interactive software for the EDIN System; (3) upgrading of the EDIN technology module library to an interactive status; (4) verification of the soundness of the developing EDIN System; (5) support of NASA in design analysis studies using the EDIN System; (6) provide training and documentation in the use of the EDIN System; and (7) provide an implementation plan for the next phase of development and recommendations for meeting long range objectives.

  17. National responses to HIV/AIDS and non-communicable diseases in developing countries: analysis of strategic parallels and differences

    Directory of Open Access Journals (Sweden)

    Tilahun Nigatu Haregu

    2014-04-01

    Full Text Available HIV/AIDS and non-communicable diseases (NCDs epidemics may have many important similarities in their aetiology, pathogenesis and management. Evidence about the similarities and differences between the national responses HIV/AIDS and NCDs is essential for an integrated response. The objective of this study was to examine the parallels and differences between national responses to HIV/AIDS and NCDs in selected developing countries. This study applied a strategic level comparative case study approach as its study design. The main construct was national response to HIV/AIDS and NCDs. The 4 overarching themes were policy response, institutional mechanism, programmatic response and strategic information. Four countries were purposively selected as cases. Data were collected and triangulated from a multiple sources. The focus of analysis included identifying items for comparison, characteristics to be compared, degrees of similarity, and strategic importance of similarities. Analysis of data was qualitative content analysis with within-case, between-case, and across-case comparisons. While the nature of the disease and the contents of national HIV/AIDS and NCD policies are different, the policy processes involved are largely similar. Functional characteristics of programmatic response to HIV/AIDS and NCDs are similar. But the internal constituents are different. Though both HIV and NCDs require both a multi-sectorial response and a national coordination mechanism, the model and the complexity of the coordination are different. Strategic information frameworks for HIV/AIDS and NCDs use similar models. However, the indicators, targets and priorities are different. In conclusion, the national responses between HIV/AIDS and NCDs are largely similar in approaches and functions but different in content.

  18. 75 FR 42749 - Fidelity National Financial, Inc.; Analysis of the Agreement Containing Consent Order to Aid...

    Science.gov (United States)

    2010-07-22

    ... Fidelity National Financial, Inc.; Analysis of the Agreement Containing Consent Order to Aid Public Comment... or unfair methods of competition. The attached Analysis to Aid Public Comment describes both the.... Comments should refer to ``Fidelity National Financial, File No. 091 0032'' to facilitate the...

  19. 75 FR 53968 - Reverb Communications, Inc.; Analysis of Proposed Consent Order To Aid Public Comment

    Science.gov (United States)

    2010-09-02

    ... proposed order. This matter involves the public relations, marketing, and sales services that respondents... Reverb Communications, Inc.; Analysis of Proposed Consent Order To Aid Public Comment AGENCY: Federal... methods of competition. The attached Analysis to Aid Public Comment describes both the allegations in...

  20. Computer-aided design of nano-filter construction using DNA self-assembly

    OpenAIRE

    Mohammadzadegan Reza; Mohabatkar Hassan

    2006-01-01

    AbstractComputer-aided design plays a fundamental role in both top-down and bottom-up nano-system fabrication. This paper presents a bottom-up nano-filter patterning process based on DNA self-assembly. In this study we designed a new method to construct fully designed nano-filters with the pores between 5 nm and 9 nm in diameter. Our calculations illustrated that by constructing such a nano-filter we would be able to separate many molecules.

  1. Design of tailor-made chemical blend using a decomposition-based computer-aided approach

    DEFF Research Database (Denmark)

    Yunus, Nor Alafiza; Gernaey, Krist; Manan, Z.A.;

    2011-01-01

    design methodology for blended liquid products that identifies a set of feasible chemical blends. The blend design problem is formulated as a Mixed Integer Nonlinear Programming (MINLP) model where the objective is to find the optimal blended gasoline or diesel product subject to types of chemicals and...... selection. The application of this systematic and computer-aided approach is illustrated through a case study involving the design of blends of gasoline with oxygenated compounds resulting from degradation and fermentation of biomass for use in internal combustion engines. Emphasis is given here on the...

  2. Computer-Aided Design System for CP Single-Screw Compressor

    Institute of Scientific and Technical Information of China (English)

    SHEN Jing-feng; YAO Fu-sheng

    2006-01-01

    To design various optimum parameters and simulate the working process of CP single-screw compressor,the Computer-Aided Design(CAD)system for the CP singlescrew compressor has been established.A new method based on computer graphics technology,database technology,object-oriented programming technology,and visual simulation technology has been adopted in this CAD system.The system has integrated solid modeling function with parameterization design function and animator simulation function based on analyzing the working principle of the CP single-screw compressor.The experimental results show fhat the CAD system for the CP single-screw compressor is practical and feasible.

  3. Computer-aided approach for design of tailor-made blended products

    DEFF Research Database (Denmark)

    Yunus, Nor Alafiza; Gernaey, Krist; Woodley, John;

    2012-01-01

    A computer-aided methodology has been developed for the design of blended (mixture) products. Through this methodology, it is possible to identify the most suitable chemicals for blending, and “tailor” the blend according to specified product needs (usually product attributes, e.g. performance as...... well as regulatory). The product design methodology has four tasks. First, the design problem is defined: the product needs are identified, translated into target properties and the constraints for each target property are defined. Secondly, target property models are retrieved from a property model...

  4. Implementation and display of Computer Aided Design (CAD) models in Monte Carlo radiation transport and shielding applications

    International Nuclear Information System (INIS)

    An Xwindow application capable of importing geometric information directly from two Computer Aided Design (CAD) based formats for use in radiation transport and shielding analyses is being developed at ORNL. The application permits the user to graphically view the geometric models imported from the two formats for verification and debugging. Previous models, specifically formatted for the radiation transport and shielding codes can also be imported. Required extensions to the existing combinatorial geometry analysis routines are discussed. Examples illustrating the various options and features which will be implemented in the application are presented. The use of the application as a visualization tool for the output of the radiation transport codes is also discussed

  5. Research on Computer Aided Design (CAD) Technique and Novel Pattern for Electronic Architectural Drawing and Perspective

    Institute of Scientific and Technical Information of China (English)

    Tian XiJiang

    2015-01-01

    With the progress of computer technology, CAD technique is urgent needed. In this paper, we conduct numerical and theoretical analysis and research on computer aided design technique and novel pattern for electronic architectural drawing and perspective. AUTOCAD drawing soRware because of its versatility and easy entry, in engineering has broad user base, but also because of the basis of general drawing software, often cannot directly use of the existing order efficiently complete professional drawing. We modify the current pattern and introduce our proposed pattern for advancement. The experiment proves the effectiveness of the pattern. In addition, we will conduct more insightful research in the future to nolish the current anoroach.

  6. Magnetic shielding design analysis

    International Nuclear Information System (INIS)

    Two passive magnetic-shielding-design approaches for static external fields are reviewed. The first approach uses the shielding solutions for spheres and cylinders while the second approach requires solving Maxwell's equations. Experimental data taken at LLNL are compared with the results from these shieldings-design methods, and improvements are recommended for the second method. Design considerations are discussed here along with the importance of material gaps in the shield

  7. A critical analysis of the law on AIDS in India.

    Science.gov (United States)

    Padmavati, A

    1991-01-01

    Though global focus upon AIDS has centered largely upon the United States and countries in Africa, the growing number of AIDS cases and HIV-infected persons in India should not be ignored. The number of reported HIV+ cases have increased from zero in September, 1989, to 910 by June, 1990. Reports have come from 4 cities, and from the northeastern states of Manipur and Nagaland. India's policymakers and legislative bodies have not, however, responded in the most constructive manner to the introduction of HIV and AIDS in the country. This commentary describes existing and proposed laws regarding the handling of persons with AIDS and those exposed to HIV, and critiques them as being unfair, unjust, and unreasonable. 1st, the Goa Public Health Act of 1987, was amended to require authorities to isolate anyone found HIV+. This Act violates Articles 19.1.d and 21. Next, AIDS prevention Bill 1989, has been proposed which would mandate every medical practitioner to inform local health authorities about the presence of an AIDS patient, and allow health authorities to forcibly question, test, and isolate an HIV-infected person in a hospital. No confidentiality provision is included to protect an individual's serological status from public disclosure. Yet another Bill introduced in Maharashtra Legislative Council by the former Public Health Minister would allow the arrest of persons with AIDS for subsequent detention in segregation camps. These bills violate human rights, and will only drive AIDS underground. The efforts of a group of activists working against this legislation in Delhi are described. They have suggested and demanded the establishment of an unit to receive and act upon discrimination complaints from AIDS victims, in addition to the release of all HIV+ persons detained in prisons, hospitals, and vigilance homes. PMID:12284540

  8. Model-based computer-aided design for controlled release of pesticides

    DEFF Research Database (Denmark)

    Muro Sunè, Nuria; Gani, Rafiqul; Bell, G.; Shirley, I.

    2005-01-01

    , can be used to study and analyze some of the important issues related to the design/application of the pesticide. This paper highlights the needs for predictive models and proposes the use of a computer aided modelling framework through which a collection of reliable and predictive constitutive...... extended models have been developed and implemented into a computer-aided system. The total model consisting of the property models embedded into the release models are then employed to study the release of different combinations of AIs and polymer-based microcapsules.......In the field of controlled release technology for pesticides or active ingredients (AI), models that can predict its delivery during application are important for purposes of design and marketing of the pesticide product. Appropriate models for the controlled release of pesticides, if available...

  9. Design of a physical model of the PBMR with the aid of Flownet

    International Nuclear Information System (INIS)

    The design of a physical model of the power conversion cycle of the pebble bed modular reactor (PBMR) with the aid of the code Flownet is discussed in this paper. The purpose of the physical model is to demonstrate the control strategies and operating procedures of the PBMR and also to demonstrate the accuracy of the simulation code Flownet. Flownet is first used to do component matching and to determine the detailed steady-state performance of the system. It is then demonstrated how the code was used to simulate the start-up procedure as well as a load following and a load rejection scenario. The study demonstrates how a micro turbine system can be designed with the aid of a powerful simulation tool in a relatively short period of time at low cost using commercially available turbochargers

  10. Design of a physical model of the PBMR with the aid of Flownet

    International Nuclear Information System (INIS)

    The design of a physical model of the PBMR with the aid of the code Flownet is discussed in this paper. The purpose of the physical model is to test the control strategies and operating procedures of the PBMR and also to demonstrate the accuracy of Flownet. Flownet is first used to do component matching and to determine the detail steady-state performance of the system. It is then demonstrated how the code was used to simulate the start-up procedure as well as a load following and a load rejection scenario. The study demonstrates how a micro model of the PBMR can be designed with the aid of a powerful simulation tool in a relatively short period of time and at low cost using commercially available turbochargers. (author)

  11. Design of tailor-made chemical blend using a decomposition-based computer-aided approach

    DEFF Research Database (Denmark)

    Yunus, Nor Alafiza; Gernaey, Krist; Manan, Z.A.; Woodley, John; Gani, Rafiqul

    2011-01-01

    Computer aided techniques form an efficient approach to solve chemical product design problems such as the design of blended liquid products (chemical blending). In chemical blending, one tries to find the best candidate, which satisfies the product targets defined in terms of desired product...... attributes (properties).The systematic computer-aided technique first establishes the search space, and then narrows it down in subsequent steps until a small number of feasible and promising candidates remain. At this point, experimental work may be conducted to verify if any or all the candidates satisfy...... the desired product attributes. Alternatively, rigorous modeling could also be used in this final step. In other words, the candidates are quickly generated and screened until a small number is left for final selection and evaluation by experiments and/or rigorous modeling. This paper presents a...

  12. Design and analysis of an active power factor correction circuit

    OpenAIRE

    Zhou, Zhen

    1989-01-01

    The design of an active-unity power factor correction circuit with variable-hysteresis control for off-line dc-to-dc switching power supplies is described. Design equations relating the boost inductor current ripple to the circuit components selection and circuit performance arc discussed. A computer-aided design program (CADO) is developed to give the optimal circuit components selection. A 500 watt, 300 volt experimental circuit is built to verify the simulation and analysis ...

  13. A Systematic Computer-Aided Framework for Integrated Design and Control of Chemical Processes

    DEFF Research Database (Denmark)

    Mansouri, Seyed Soheil; Sales-Cruz, Mauricio; Huusom, Jakob Kjøbsted;

    -defined operational conditions whereas controllability is considered to maintain desired operating points of the process at any kind of imposed disturbance under normal operating conditions. In this work, a systematic hierarchical computer-aided framework for integrated process design and control of chemical......-separator-recycle (RSR) system. Next, it will be shown that the RSR system can be replaced by an intensified unit operation, a reactive distillation column (RDC) which optimal design-control solution is also presented. The operation and control of the RSR and RDC at the optimal designs is compared with other candidate......Chemical processes are conventionally designed through a sequential approach. In this sequential approach, first, a steady-state process design is obtained and then, control structure synthesis that, in most of the cases, is based on heuristics is performed. Therefore, process design and process...

  14. Mandibular Reconstruction Using a Custom-Made Titanium Prosthesis: A Case Report on the Use of Virtual Surgical Planning and Computer-Aided Design/Computer-Aided Manufacturing.

    Science.gov (United States)

    Ow, Andrew; Tan, Winston; Pienkowski, Lukasz

    2016-09-01

    The use of virtual surgical planning and computer-aided design/computer-aided manufacturing has been reported to enhance the planning for the reconstruction of mandibular continuity defects. This case report illustrates the use of this technology in the fabrication of a custom-made titanium prosthesis to restore a segmental mandibular defect. The design specifications and sequence of the custom-made titanium prosthesis are discussed. Although successful in this case, there are limitations in its application and case selection is of vital importance. PMID:27516841

  15. Study on Computer-Aided Design Support of Traditional Architectural Theories

    OpenAIRE

    Choo, Seung Yeon

    2007-01-01

    The research presented in this thesis describes a computer-aided design support of traditional architectural theories. Traditional architectural theories in western architecture have been considered as a basis for answering the fundamental questions of architecture: proportion, symmetry, colour, harmony and so on. In particular, the aesthetic aspect of these theories has been one of many important architectural aspects, and which is concerned with the field of architecture in determining the ...

  16. On the variety of planar spirals and their applications in computer aided design

    OpenAIRE

    Kenjiro T. Miura; Rushan Ziatdinov

    2013-01-01

    In this paper we discuss the variety of planar spiral segments and their applications in objects in both the real and artificial world. The discussed curves with monotonic curvature function are well-known in geometric modelling and computer aided geometric design as fair curves, and they are very significant in aesthetic shape modelling. Fair curve segments are used for two-point G1 and G2 Hermite interpolation, as well as for generating aesthetic splines.

  17. Evolution of facility layout requirements and CAD [computer-aided design] system development

    International Nuclear Information System (INIS)

    The overall configuration of the Superconducting Super Collider (SSC) including the infrastructure and land boundary requirements were developed using a computer-aided design (CAD) system. The evolution of the facility layout requirements and the use of the CAD system are discussed. The emphasis has been on minimizing the amount of input required and maximizing the speed by which the output may be obtained. The computer system used to store the data is also described

  18. Basic Principles of Industrial Electric Power Network Computer Aided Design and Engineering

    Directory of Open Access Journals (Sweden)

    M. Fursanov

    2012-01-01

    Full Text Available A conceptual model for a computer aided design and engineering system has been developed in the paper. The paper presents basic automation process principles including a graphical representation   network and calculation results, convenient user interface, automatic mode calculation, selection of transformer rated power and cross-section area of wires. The developed algorithm and program make it possible to save time and improve quality of project implementation.

  19. Adaptation of Work Places and Homes for the Disabled Using Computer-aided Design

    OpenAIRE

    Johansson, Gerd; Eriksson, Joakim

    1994-01-01

    When adapting environments for the physically disabled, it is important to encourage and activate not only the person concerned, but also other people involved or affected. A computer aided planning tool has been developed to support the participation of all persons involved, as well as supporting the planner’s (e.g. an occupational therapist) design of the environment. The prototype development and evaluation were based on 6 case-studies, which also provided experience of the needs and requi...

  20. Lipophilicity in computer-aided drug design: new tools and applications

    OpenAIRE

    Oberhauser, Nils

    2014-01-01

    In the past decades computer-aided drug design (CADD) has become an integral part in the process of drug development. Computational methods require accurate description of chemical forces and interactions, of which the complex contribution of hydrophobicity is often only described by van der Waals energies. One way to achieve a more accurate description of hydrophobicity is the application of the molecular lipophilicity potential (MLP). The MLP is a molecular interaction field (MIF) that is b...

  1. Integration of Design and Control through Model Analysis

    DEFF Research Database (Denmark)

    Russel, Boris Mariboe; Henriksen, Jens Peter; Jørgensen, Sten Bay;

    2002-01-01

    and design (manipulative) variables that may be employed with different objectives in design and control for the integrated problem. The computer aided model analysis is highlighted through illustrative examples, involving processes with mass and/or energy recycle, where the important design and...... representing the constitutive equations identify the relationships between the important process and design variables, which help to understand, define and address some of the issues related to integration of design and control. Furthermore, the analysis is able to identify a set of process (control) variables...

  2. Computer-aided pulmonary image analysis in small animal models

    International Nuclear Information System (INIS)

    Purpose: To develop an automated pulmonary image analysis framework for infectious lung diseases in small animal models. Methods: The authors describe a novel pathological lung and airway segmentation method for small animals. The proposed framework includes identification of abnormal imaging patterns pertaining to infectious lung diseases. First, the authors’ system estimates an expected lung volume by utilizing a regression function between total lung capacity and approximated rib cage volume. A significant difference between the expected lung volume and the initial lung segmentation indicates the presence of severe pathology, and invokes a machine learning based abnormal imaging pattern detection system next. The final stage of the proposed framework is the automatic extraction of airway tree for which new affinity relationships within the fuzzy connectedness image segmentation framework are proposed by combining Hessian and gray-scale morphological reconstruction filters. Results: 133 CT scans were collected from four different studies encompassing a wide spectrum of pulmonary abnormalities pertaining to two commonly used small animal models (ferret and rabbit). Sensitivity and specificity were greater than 90% for pathological lung segmentation (average dice similarity coefficient > 0.9). While qualitative visual assessments of airway tree extraction were performed by the participating expert radiologists, for quantitative evaluation the authors validated the proposed airway extraction method by using publicly available EXACT’09 data set. Conclusions: The authors developed a comprehensive computer-aided pulmonary image analysis framework for preclinical research applications. The proposed framework consists of automatic pathological lung segmentation and accurate airway tree extraction. The framework has high sensitivity and specificity; therefore, it can contribute advances in preclinical research in pulmonary diseases

  3. Computer-aided pulmonary image analysis in small animal models

    Energy Technology Data Exchange (ETDEWEB)

    Xu, Ziyue; Mansoor, Awais; Mollura, Daniel J. [Center for Infectious Disease Imaging (CIDI), Radiology and Imaging Sciences, National Institutes of Health (NIH), Bethesda, Maryland 32892 (United States); Bagci, Ulas, E-mail: ulasbagci@gmail.com [Center for Research in Computer Vision (CRCV), University of Central Florida (UCF), Orlando, Florida 32816 (United States); Kramer-Marek, Gabriela [The Institute of Cancer Research, London SW7 3RP (United Kingdom); Luna, Brian [Microfluidic Laboratory Automation, University of California-Irvine, Irvine, California 92697-2715 (United States); Kubler, Andre [Department of Medicine, Imperial College London, London SW7 2AZ (United Kingdom); Dey, Bappaditya; Jain, Sanjay [Center for Tuberculosis Research, Johns Hopkins University School of Medicine, Baltimore, Maryland 21231 (United States); Foster, Brent [Department of Biomedical Engineering, University of California-Davis, Davis, California 95817 (United States); Papadakis, Georgios Z. [Radiology and Imaging Sciences, National Institutes of Health (NIH), Bethesda, Maryland 32892 (United States); Camp, Jeremy V. [Department of Microbiology and Immunology, University of Louisville, Louisville, Kentucky 40202 (United States); Jonsson, Colleen B. [National Institute for Mathematical and Biological Synthesis, University of Tennessee, Knoxville, Tennessee 37996 (United States); Bishai, William R. [Howard Hughes Medical Institute, Chevy Chase, Maryland 20815 and Center for Tuberculosis Research, Johns Hopkins University School of Medicine, Baltimore, Maryland 21231 (United States); Udupa, Jayaram K. [Medical Image Processing Group, Department of Radiology, University of Pennsylvania, Philadelphia, Pennsylvania 19104 (United States)

    2015-07-15

    Purpose: To develop an automated pulmonary image analysis framework for infectious lung diseases in small animal models. Methods: The authors describe a novel pathological lung and airway segmentation method for small animals. The proposed framework includes identification of abnormal imaging patterns pertaining to infectious lung diseases. First, the authors’ system estimates an expected lung volume by utilizing a regression function between total lung capacity and approximated rib cage volume. A significant difference between the expected lung volume and the initial lung segmentation indicates the presence of severe pathology, and invokes a machine learning based abnormal imaging pattern detection system next. The final stage of the proposed framework is the automatic extraction of airway tree for which new affinity relationships within the fuzzy connectedness image segmentation framework are proposed by combining Hessian and gray-scale morphological reconstruction filters. Results: 133 CT scans were collected from four different studies encompassing a wide spectrum of pulmonary abnormalities pertaining to two commonly used small animal models (ferret and rabbit). Sensitivity and specificity were greater than 90% for pathological lung segmentation (average dice similarity coefficient > 0.9). While qualitative visual assessments of airway tree extraction were performed by the participating expert radiologists, for quantitative evaluation the authors validated the proposed airway extraction method by using publicly available EXACT’09 data set. Conclusions: The authors developed a comprehensive computer-aided pulmonary image analysis framework for preclinical research applications. The proposed framework consists of automatic pathological lung segmentation and accurate airway tree extraction. The framework has high sensitivity and specificity; therefore, it can contribute advances in preclinical research in pulmonary diseases.

  4. Thematic Analysis of Iranian Female Adolescents’ Perceptions About HIV/AIDS: A Qualitative Study

    OpenAIRE

    Elham Ahmadnezhad; Nariman Sepehrvand; Sanaz Hatami; Farshid FayyazJahani; Somayyeh Ahmadnezhad; Mohammad Karamyyar; Shahrzad BazarganHejazi

    2013-01-01

    Background: HIV/AIDS continues to be a major global health problem. The aim of this study was to evaluate common opinions and beliefs about HIV/AIDS among Iranian teenager girls. Methods: This Qualitative study (face-to-face interviews with tape recording) was conducted among fifty female teenager school students in Urmia-Iran. Results: The thematic analysis indicated the main information sources for HIV/AIDS among teenage girls to be their mother and teachers. The participants had litt...

  5. Structural analysis at aircraft conceptual design stage

    Science.gov (United States)

    Mansouri, Reza

    In the past 50 years, computers have helped by augmenting human efforts with tremendous pace. The aircraft industry is not an exception. Aircraft industry is more than ever dependent on computing because of a high level of complexity and the increasing need for excellence to survive a highly competitive marketplace. Designers choose computers to perform almost every analysis task. But while doing so, existing effective, accurate and easy to use classical analytical methods are often forgotten, which can be very useful especially in the early phases of the aircraft design where concept generation and evaluation demands physical visibility of design parameters to make decisions [39, 2004]. Structural analysis methods have been used by human beings since the very early civilization. Centuries before computers were invented; the pyramids were designed and constructed by Egyptians around 2000 B.C, the Parthenon was built by the Greeks, around 240 B.C, Dujiangyan was built by the Chinese. Persepolis, Hagia Sophia, Taj Mahal, Eiffel tower are only few more examples of historical buildings, bridges and monuments that were constructed before we had any advancement made in computer aided engineering. Aircraft industry is no exception either. In the first half of the 20th century, engineers used classical method and designed civil transport aircraft such as Ford Tri Motor (1926), Lockheed Vega (1927), Lockheed 9 Orion (1931), Douglas DC-3 (1935), Douglas DC-4/C-54 Skymaster (1938), Boeing 307 (1938) and Boeing 314 Clipper (1939) and managed to become airborne without difficulty. Evidencing, while advanced numerical methods such as the finite element analysis is one of the most effective structural analysis methods; classical structural analysis methods can also be as useful especially during the early phase of a fixed wing aircraft design where major decisions are made and concept generation and evaluation demands physical visibility of design parameters to make decisions

  6. Metalloporphyrin catalysts for oxygen reduction developed using computer-aided molecular design

    Energy Technology Data Exchange (ETDEWEB)

    Ryba, G.N.; Hobbs, J.D.; Shelnutt, J.A. [and others

    1996-04-01

    The objective of this project is the development of a new class of metalloporphyrin materials used as catalsyts for use in fuel cell applications. The metalloporphyrins are excellent candidates for use as catalysts at both the anode and cathode. The catalysts reduce oxygen in 1 M potassium hydroxide, as well as in 2 M sulfuric acid. Covalent attachment to carbon supports is being investigated. The computer-aided molecular design is an iterative process, in which experimental results feed back into the design of future catalysts.

  7. Automated a complex computer aided design concept generated using macros programming

    International Nuclear Information System (INIS)

    Changing a complex Computer Aided design profile such as car and aircraft surfaces has always been difficult and challenging. The capability of CAD software such as AutoCAD and CATIA show that a simple configuration of a CAD design can be easily modified without hassle, but it is not the case with complex design configuration. Design changes help users to test and explore various configurations of the design concept before the production of a model. The purpose of this study is to look into macros programming as parametric method of the commercial aircraft design. Macros programming is a method where the configurations of the design are done by recording a script of commands, editing the data value and adding a certain new command line to create an element of parametric design. The steps and the procedure to create a macro programming are discussed, besides looking into some difficulties during the process of creation and advantage of its usage. Generally, the advantages of macros programming as a method of parametric design are; allowing flexibility for design exploration, increasing the usability of the design solution, allowing proper contained by the model while restricting others and real time feedback changes

  8. Automated a complex computer aided design concept generated using macros programming

    Science.gov (United States)

    Rizal Ramly, Mohammad; Asrokin, Azharrudin; Abd Rahman, Safura; Zulkifly, Nurul Ain Md

    2013-12-01

    Changing a complex Computer Aided design profile such as car and aircraft surfaces has always been difficult and challenging. The capability of CAD software such as AutoCAD and CATIA show that a simple configuration of a CAD design can be easily modified without hassle, but it is not the case with complex design configuration. Design changes help users to test and explore various configurations of the design concept before the production of a model. The purpose of this study is to look into macros programming as parametric method of the commercial aircraft design. Macros programming is a method where the configurations of the design are done by recording a script of commands, editing the data value and adding a certain new command line to create an element of parametric design. The steps and the procedure to create a macro programming are discussed, besides looking into some difficulties during the process of creation and advantage of its usage. Generally, the advantages of macros programming as a method of parametric design are; allowing flexibility for design exploration, increasing the usability of the design solution, allowing proper contained by the model while restricting others and real time feedback changes.

  9. DEMAID - A DESIGN MANAGER'S AID FOR INTELLIGENT DECOMPOSITION (SGI IRIS VERSION)

    Science.gov (United States)

    Rogers, J. L.

    1994-01-01

    Many engineering systems are large and multi-disciplinary. Before the design of new complex systems such as large space platforms can begin, the possible interactions among subsystems and their parts must be determined. Once this is completed the proposed system can be decomposed to identify its hierarchical structure. DeMAID (A Design Manager's Aid for Intelligent Decomposition) is a knowledge-based system for ordering the sequence of modules and identifying a possible multilevel structure for the design problem. DeMAID displays the modules in an N x N matrix format (called a design structure matrix) where a module is any process that requires input and generates an output. (Modules which generate an output but do not require an input, such as an initialization process, are also acceptable.) Although DeMAID requires an investment of time to generate and refine the list of modules for input, it could save a considerable amount of money and time in the total design process, particularly in new design problems where the ordering of the modules has not been defined. The decomposition of a complex design system into subsystems requires the judgement of the design manager. DeMAID reorders and groups the modules based on the links (interactions) among the modules, helping the design manager make decomposition decisions early in the design cycle. The modules are grouped into circuits (the subsystems) and displayed in an N x N matrix format. Feedback links, which indicate an iterative process, are minimized and only occur within a subsystem. Since there are no feedback links among the circuits, the circuits can be displayed in a multilevel format. Thus, a large amount of information is reduced to one or two displays which are stored for later retrieval and modification. The design manager and leaders of the design teams then have a visual display of the design problem and the intricate interactions among the different modules. The design manager could save a substantial

  10. Computer-aided design of microvasculature systems for use in vascular scaffold production

    Energy Technology Data Exchange (ETDEWEB)

    Mondy, William Lafayette [Department of Chemical and Biomedical Engineering, University of South Florida, FL (United States); Cameron, Don [Department of Pathology and Cell Biology, College of Medicine, University of South Florida, FL (United States); Timmermans, Jean-Pierre [Department of Veterinary Sciences, University of Antwerp (Belgium); De Clerck, Nora [Department of Biomedical Sciences University of Antwerp (Belgium); Sasov, Alexander [Skyscan (Belgium); Casteleyn, Christophe [College of Veterinary Medicine, Ghent University (Belgium); Piegl, Les A [Department of Computer Science and Engineering, University of South Florida, FL (United States)

    2009-09-15

    In vitro biomedical engineering of intact, functional vascular networks, which include capillary structures, is a prerequisite for adequate vascular scaffold production. Capillary structures are necessary since they provide the elements and compounds for the growth, function and maintenance of 3D tissue structures. Computer-aided modeling of stereolithographic (STL) micro-computer tomographic (micro-CT) 3D models is a technique that enables us to mimic the design of vascular tree systems containing capillary beds, found in tissues. In our first paper (Mondy et al 2009 Tissue Eng. at press), using micro-CT, we studied the possibility of using vascular tissues to produce data capable of aiding the design of vascular tree scaffolding, which would help in the reverse engineering of a complete vascular tree system including capillary bed structures. In this paper, we used STL models of large datasets of computer-aided design (CAD) data of vascular structures which contained capillary structures that mimic those in the dermal layers of rabbit skin. Using CAD software we created from 3D STL models a bio-CAD design for the development of capillary-containing vascular tree scaffolding for skin. This method is designed to enhance a variety of therapeutic protocols including, but not limited to, organ and tissue repair, systemic disease mediation and cell/tissue transplantation therapy. Our successful approach to in vitro vasculogenesis will allow the bioengineering of various other types of 3D tissue structures, and as such greatly expands the potential applications of biomedical engineering technology into the fields of biomedical research and medicine.

  11. Influence of different luting protocols on shear bond strength of computer aided design/computer aided manufacturing resin nanoceramic material to dentin

    Science.gov (United States)

    Poggio, Claudio; Pigozzo, Marco; Ceci, Matteo; Scribante, Andrea; Beltrami, Riccardo; Chiesa, Marco

    2016-01-01

    Background: The purpose of this study was to evaluate the influence of three different luting protocols on shear bond strength of computer aided design/computer aided manufacturing (CAD/CAM) resin nanoceramic (RNC) material to dentin. Materials and Methods: In this in vitro study, 30 disks were milled from RNC blocks (Lava Ultimate/3M ESPE) with CAD/CAM technology. The disks were subsequently cemented to the exposed dentin of 30 recently extracted bovine permanent mandibular incisors. The specimens were randomly assigned into 3 groups of 10 teeth each. In Group 1, disks were cemented using a total-etch protocol (Scotchbond™ Universal Etchant phosphoric acid + Scotchbond Universal Adhesive + RelyX™ Ultimate conventional resin cement); in Group 2, disks were cemented using a self-etch protocol (Scotchbond Universal Adhesive + RelyX™ Ultimate conventional resin cement); in Group 3, disks were cemented using a self-adhesive protocol (RelyX™ Unicem 2 Automix self-adhesive resin cement). All cemented specimens were placed in a universal testing machine (Instron Universal Testing Machine 3343) and submitted to a shear bond strength test to check the strength of adhesion between the two substrates, dentin, and RNC disks. Specimens were stressed at a crosshead speed of 1 mm/min. Data were analyzed with analysis of variance and post-hoc Tukey's test at a level of significance of 0.05. Results: Post-hoc Tukey testing showed that the highest shear strength values (P < 0.001) were reported in Group 2. The lowest data (P < 0.001) were recorded in Group 3. Conclusion: Within the limitations of this in vitro study, conventional resin cements (coupled with etch and rinse or self-etch adhesives) showed better shear strength values compared to self-adhesive resin cements. Furthermore, conventional resin cements used together with a self-etch adhesive reported the highest values of adhesion. PMID:27076822

  12. The Effects of Student Financial Aid on Persistence: A Sequential Analysis.

    Science.gov (United States)

    St. John, Edward P.; And Others

    1991-01-01

    Analysis of effects of different student financial aid types on year-to-year persistence of high school seniors of 1980 found social and educational background had differential effects at different points in the college experience, college experiences were influential, student aid had a positive effect on persistence, and loans promoted…

  13. The Work of Teacher Aides in Australia: An Analysis of Job Advertisements

    Science.gov (United States)

    Stephenson, Jennifer; Carter, Mark

    2014-01-01

    Although teacher aides are often employed in schools to provide support for students with disabilities and special education needs, there is limited Australian research on their work and employer expectations. This article provides an analysis of advertisements for teacher aide positions, and compares the content of advertisements with role…

  14. Operator Station Design System - A computer aided design approach to work station layout

    Science.gov (United States)

    Lewis, J. L.

    1979-01-01

    The Operator Station Design System is resident in NASA's Johnson Space Center Spacecraft Design Division Performance Laboratory. It includes stand-alone minicomputer hardware and Panel Layout Automated Interactive Design and Crew Station Assessment of Reach software. The data base consists of the Shuttle Transportation System Orbiter Crew Compartment (in part), the Orbiter payload bay and remote manipulator (in part), and various anthropometric populations. The system is utilized to provide panel layouts, assess reach and vision, determine interference and fit problems early in the design phase, study design applications as a function of anthropometric and mission requirements, and to accomplish conceptual design to support advanced study efforts.

  15. NEXUS/NASCAD- NASA ENGINEERING EXTENDIBLE UNIFIED SOFTWARE SYSTEM WITH NASA COMPUTER AIDED DESIGN

    Science.gov (United States)

    Purves, L. R.

    1994-01-01

    NEXUS, the NASA Engineering Extendible Unified Software system, is a research set of computer programs designed to support the full sequence of activities encountered in NASA engineering projects. This sequence spans preliminary design, design analysis, detailed design, manufacturing, assembly, and testing. NEXUS primarily addresses the process of prototype engineering, the task of getting a single or small number of copies of a product to work. Prototype engineering is a critical element of large scale industrial production. The time and cost needed to introduce a new product are heavily dependent on two factors: 1) how efficiently required product prototypes can be developed, and 2) how efficiently required production facilities, also a prototype engineering development, can be completed. NEXUS extendibility and unification are achieved by organizing the system as an arbitrarily large set of computer programs accessed in a common manner through a standard user interface. The NEXUS interface is a multipurpose interactive graphics interface called NASCAD (NASA Computer Aided Design). NASCAD can be used to build and display two and three-dimensional geometries, to annotate models with dimension lines, text strings, etc., and to store and retrieve design related information such as names, masses, and power requirements of components used in the design. From the user's standpoint, NASCAD allows the construction, viewing, modification, and other processing of data structures that represent the design. Four basic types of data structures are supported by NASCAD: 1) three-dimensional geometric models of the object being designed, 2) alphanumeric arrays to hold data ranging from numeric scalars to multidimensional arrays of numbers or characters, 3) tabular data sets that provide a relational data base capability, and 4) procedure definitions to combine groups of system commands or other user procedures to create more powerful functions. NASCAD has extensive abilities to

  16. Computer-Aided Drug Design (CADD): Methodological Aspects and Practical Applications in Cancer Research

    Science.gov (United States)

    Gianti, Eleonora

    Computer-Aided Drug Design (CADD) has deservedly gained increasing popularity in modern drug discovery (Schneider, G.; Fechner, U. 2005), whether applied to academic basic research or the pharmaceutical industry pipeline. In this work, after reviewing theoretical advancements in CADD, we integrated novel and stateof- the-art methods to assist in the design of small-molecule inhibitors of current cancer drug targets, specifically: Androgen Receptor (AR), a nuclear hormone receptor required for carcinogenesis of Prostate Cancer (PCa); Signal Transducer and Activator of Transcription 5 (STAT5), implicated in PCa progression; and Epstein-Barr Nuclear Antigen-1 (EBNA1), essential to the Epstein Barr Virus (EBV) during latent infections. Androgen Receptor. With the aim of generating binding mode hypotheses for a class (Handratta, V.D. et al. 2005) of dual AR/CYP17 inhibitors (CYP17 is a key enzyme for androgens biosynthesis and therefore implicated in PCa development), we successfully implemented a receptor-based computational strategy based on flexible receptor docking (Gianti, E.; Zauhar, R.J. 2012). Then, with the ultimate goal of identifying novel AR binders, we performed Virtual Screening (VS) by Fragment-Based Shape Signatures, an improved version of the original method developed in our Laboratory (Zauhar, R.J. et al. 2003), and we used the results to fully assess the high-level performance of this innovative tool in computational chemistry. STAT5. The SRC Homology 2 (SH2) domain of STAT5 is responsible for phospho-peptide recognition and activation. As a keystone of Structure-Based Drug Design (SBDD), we characterized key residues responsible for binding. We also generated a model of STAT5 receptor bound to a phospho-peptide ligand, which was validated by docking publicly known STAT5 inhibitors. Then, we performed Shape Signatures- and docking-based VS of the ZINC database (zinc.docking.org), followed by Molecular Mechanics Generalized Born Surface Area (MMGBSA

  17. Computer-aided design of high-contact-ratio gears for minimum dynamic load and stress

    Science.gov (United States)

    Lin, Hsiang Hsi; Lee, Chinwai; Oswald, Fred B.; Townsend, Dennis P.

    1990-01-01

    A computer aided design procedure is presented for minimizing dynamic effects on high contact ratio gears by modification of the tooth profile. Both linear and parabolic tooth profile modifications of high contact ratio gears under various loading conditions are examined and compared. The effects of the total amount of modification and the length of the modification zone were systematically studied at various loads and speeds to find the optimum profile design for minimizing the dynamic load and the tooth bending stress. Parabolic profile modification is preferred over linear profile modification for high contact ratio gears because of its lower sensitivity to manufacturing errors. For parabolic modification, a greater amount of modification at the tooth tip and a longer modification zone are required. Design charts are presented for high contact ratio gears with various profile modifications operating under a range of loads. A procedure is illustrated for using the charts to find the optimum profile design.

  18. Dynamic light as a transformational tool in computer-aided design

    DEFF Research Database (Denmark)

    Hansen, Ellen Kathrine; Mullins, Michael Finbarr; Triantafyllidis, Georgios

    2016-01-01

    Architecture and lighting technology has undergone a revolution in recent years, as new sensor technologies and computational skills enable ‘intelligent materials’, interactive control of light, energy-saving measures and new LED technology to be applied in the built environment, which can...... to develop mixed research and design methods, where computer aided design tools used in physical and virtual experiments assist the transdisciplinary design process. The task is to discover a sequence of processes and tools that support each other and lead to innovative design solutions produced from...... this in practice, it can be instructive to focus more narrowly on a single aspect of architectural intervention. Toward describing and developing such methods, this paper focusses on the potential of lighting to act as a primary means of renovating and transforming architectural environments. In this regard, light...

  19. Breaking the Glass Ceiling: Increasing the Meaningful Involvement of Women Living With HIV/AIDS (MIWA) in the Design and Delivery of HIV/AIDS Services.

    Science.gov (United States)

    Carter, Allison; Greene, Saara; Nicholson, Valerie; O'Brien, Nadia; Sanchez, Margarite; de Pokomandy, Alexandra; Loutfy, Mona; Kaida, Angela

    2015-01-01

    The meaningful involvement of women living with HIV/AIDS (MIWA) is a key feature of women-centred HIV care, yet little is known about transforming MIWA from principle to practice. Drawing on focus group data from the Canadian HIV Women's Sexual and Reproductive Health Cohort Study (CHIWOS), we explored HIV-positive women's meaningful involvement in the design and delivery of HIV/AIDS services in British Columbia, Canada. In this article, we highlight the benefits and tensions that emerge as women traverse multiple roles as service users and service providers within their care communities, and the impact this has on their access to care and overall health. PMID:25256222

  20. Development of design and safety analysis supporting system for casks

    International Nuclear Information System (INIS)

    Mitsubishi heavy Industries has developed a design and safety analysis supporting system 'CADDIE' (Cask Computer Aided Design, Drawing and Integrated Evaluation System), with the following objectives: (1) Enhancement of efficiency of the design and safety analysis (2) Further advancement of design quality (3) Response to the diversification of design requirements. The features of this system are as follows: (1) The analysis model data common to analyses is established, and it is prepared automatically from the model made by CAD. (2) The input data for the analysis code is available by simple operation of conversation type from the analysis model data. (3) The analysis results are drawn out in diagrams by output generator, so as to facilitate easy observation. (4) The data of material properties, fuel assembly data, etc. required for the analyses are made available as a data base. (J.P.N.)

  1. Research design and statistical analysis

    CERN Document Server

    Myers, Jerome L; Lorch Jr, Robert F

    2013-01-01

    Research Design and Statistical Analysis provides comprehensive coverage of the design principles and statistical concepts necessary to make sense of real data.  The book's goal is to provide a strong conceptual foundation to enable readers to generalize concepts to new research situations.  Emphasis is placed on the underlying logic and assumptions of the analysis and what it tells the researcher, the limitations of the analysis, and the consequences of violating assumptions.  Sampling, design efficiency, and statistical models are emphasized throughout. As per APA recommendations

  2. Exploring interaction between a non-speaking boy using aided AAC and his everyday communication partners: features of turn organizing and turn design

    DEFF Research Database (Denmark)

    Pilesjö, Maja Sigurd; Rasmussen, Gitte

    2011-01-01

    This study investigates the practice of achieving common understanding in aided Augmentative and Alternative Communication (AAC). The aims are to explore whether communicative contributions can be described as turns, as defined in conversation analytic terms, and how then the contributions to the...... interaction can be designed. The principles and practices of Conversation Analysis (CA) were used to record, transcribe and analyse conversations between a non-speaking boy with cerebral palsy with, on different occasions, his mother, his assistant and his friend. The boy augments his communication with aided...... turn constructional unit (TCU) emerges, and the turn-at-action is designed and oriented to as a TCU-based unit. The analysis will also show that turns can be designed as non TCU-based units. These findings may have implications for CA theory as well as for clinical intervention....

  3. Analysis and design of advice

    CERN Document Server

    Jureta, Ivan

    2011-01-01

    This innovative book offers a rigorous approach to the analysis and design of advice in real-world decision situations, in which the advisor must manage with variously imprecise, unclear, incomplete or conflicting qualitative information.

  4. Computer aided design of digital controller for radial active magnetic bearings

    Science.gov (United States)

    Cai, Zhong; Shen, Zupei; Zhang, Zuming; Zhao, Hongbin

    1992-01-01

    A five degree of freedom Active Magnetic Bearing (AMB) system is developed which is controlled by digital controllers. The model of the radial AMB system is linearized and the state equation is derived. Based on the state variables feedback theory, digital controllers are designed. The performance of the controllers are evaluated according to experimental results. The Computer Aided Design (CAD) method is used to design controllers for magnetic bearings. The controllers are implemented with a digital signal processing (DSP) system. The control algorithms are realized with real-time programs. It is very easy to change the controller by changing or modifying the programs. In order to identify the dynamic parameters of the controlled magnetic system, a special experiment was carried out. Also, the online Recursive Least Squares (RLS) parameter identification method is studied. It can be realized with the digital controllers. Online parameter identification is essential for the realization of an adaptive controller.

  5. A Web-based Computer-Aided Material-Selection System for Aircraft Design

    Directory of Open Access Journals (Sweden)

    Yuanpei Lan

    2011-05-01

    Full Text Available A web-based computer-aided material-selection system for aircraft design was put forward, applying a material-selection strategy combined screening and ranking methods. This combined strategy could make good use of selection experience and material testing data, thus making the selection results more reasonable and bringing more standardization to the material selection process. The system’s Browser/ Server (B/S architecture together with its implementation details was described. The B/S system could be accessed with web browser conveniently. The system’s effectiveness was demonstrated by two aircraft-design material-selection case in actual applications. This system could help designer select suitable materials for airframe, provide knowledge for inexperienced engineer and accumulate enterprise-level material-selection expertise.

  6. Computer-aided design system for technical and economical comparison of crane electrical drives

    OpenAIRE

    Gerasymiak, Rostyslav; Busher, Viktor; Shvets, Liudmyla; Savich, Svitlana

    2012-01-01

    Computer-aided design system for technical and economic comparison of crane electrical drives, considering the ratio of static and dynamic modes, load and moment inertia, relative running time with reduced speed, is designed. The computer-aided design system provides an opportunity to make a better informed decision about the choice or upgrading of electrical drives. Розроблено програмний комплекс для техніко-економічного порівняння кранових електроприводів з урахуванням співвідношення ста...

  7. Research on the Procedure for Computer-Aided Pattern Design of Uygur's Flowered Hats

    OpenAIRE

    Shuxian Liu; Xiaohua Li

    2013-01-01

    Xinjiang Uygur’s flowered hats is famous all over the world, it leads the world of headwear of variou nationalities within China by the variety of styles, the various ways of how to emroider pattern design and exquisite manufacture. It is unusual even in national costumes art of the world. The poupose of this study is to analyze Uygur's headwear, study the rules of Uygur's headwear pattern, analyze the characteristic of the basic pattern, research on the procedure for computer-aided pattern d...

  8. RETRACTED: Auricular prosthesis fabrication using computer-aided design and rapid prototyping technologies.

    Science.gov (United States)

    Shah, Mayank

    2016-06-01

    At the request of the editorMayank Shah 'Auricular prosthesis fabrication using computer-aided design and rapid prototyping technologies' Prosthetics and Orthotics International, published online before print on October 8, 2013 as doi:10.1177/0309364613504779has been retracted. This is because it contains unattributed overlap withK. Subburaj, C. Nair, S. Rajesh, S. M. Meshram, B. Ravi 'Rapid development of auricular prosthesis using CAD and rapid prototyping technologies' International Journal of Oral & Maxillofacial Surgery 2007; 36: 938-943 doi:10.1016/j.ijom.2007.07.013. PMID:24104058

  9. Computer Aided Design of Depressed Collectors for High Power Electron Tubes

    Science.gov (United States)

    Singh, A.; Valfells, A.; Kolander, M.; Granatstein, V. L.

    2003-12-01

    We present an overview of techniques and computer codes developed by us for systematic design of depressed collectors with special reference to devices that use gyrating electron beams. These techniques facilitate achievement of high power levels in electron tubes. ProfilEM is an aid to controlling the trajectories of primary electrons. BSCAT provides for tracing the trajectories of backscattered electrons. Multiple generations of backscatter can be obtained, while keeping the number of rays to be tracked within manageable limits. We describe examples of applying these codes to the case of two-stage depressed collectors for a 1.5 MW 110 GHz gyrotron.

  10. Curves and surfaces for computer-aided geometric design a practical guide

    CERN Document Server

    Farin, Gerald

    1992-01-01

    A leading expert in CAGD, Gerald Farin covers the representation, manipulation, and evaluation of geometric shapes in this the Third Edition of Curves and Surfaces for Computer Aided Geometric Design. The book offers an introduction to the field that emphasizes Bernstein-Bezier methods and presents subjects in an informal, readable style, making this an ideal text for an introductory course at the advanced undergraduate or graduate level.The Third Edition includes a new chapter on Topology, offers new exercises and sections within most chapters, combines the material on Geometric Continuity i

  11. Generic Mathematical Programming Formulation and Solution for Computer-Aided Molecular Design

    DEFF Research Database (Denmark)

    Zhang, Lei; Cignitti, Stefano; Gani, Rafiqul

    2015-01-01

    This short communication presents a generic mathematical programming formulation for Computer-Aided Molecular Design (CAMD). A given CAMD problem, based on target properties, is formulated as a Mixed Integer Linear/Non-Linear Program (MILP/MINLP). The mathematical programming model presented here......, which is formulated as an MILP/MINLP problem, considers first-order and second-order molecular groups for molecular structure representation and property estimation. It is shown that various CAMD problems can be formulated and solved through this model....

  12. User's manual: Computer-aided design programs for inductor-energy-storage dc-to-dc electronic power converters

    Science.gov (United States)

    Huffman, S.

    1977-01-01

    Detailed instructions on the use of two computer-aided-design programs for designing the energy storage inductor for single winding and two winding dc to dc converters are provided. Step by step procedures are given to illustrate the formatting of user input data. The procedures are illustrated by eight sample design problems which include the user input and the computer program output.

  13. Integrating Cognitive Mapping Analysis into Multi-Criteria Decision Aiding

    OpenAIRE

    Kpoumié, Amidou; Damart, Sébastien; Tsoukiàs, Alexis

    2012-01-01

    Multi-criteria decision aiding (MCDA) is a process implying two distinctive actors (the client and the analyst) which aims at providing transparent and coherent support for complex decision situations, taking into account values of decision makers involved in a specific decision context. The theoretical framework of MCDA traditionally addresses problems involving a single decision maker. However, MCDA ought to investigate the case where the decision maker is made up of groups of individuals w...

  14. Shell stability analysis in a computer aided engineering (CAE) environment

    Science.gov (United States)

    Arbocz, J.; Hol, J. M. A. M.

    1993-01-01

    The development of 'DISDECO', the Delft Interactive Shell DEsign COde is described. The purpose of this project is to make the accumulated theoretical, numerical and practical knowledge of the last 25 years or so readily accessible to users interested in the analysis of buckling sensitive structures. With this open ended, hierarchical, interactive computer code the user can access from his workstation successively programs of increasing complexity. The computational modules currently operational in DISDECO provide the prospective user with facilities to calculate the critical buckling loads of stiffened anisotropic shells under combined loading, to investigate the effects the various types of boundary conditions will have on the critical load, and to get a complete picture of the degrading effects the different shapes of possible initial imperfections might cause, all in one interactive session. Once a design is finalized, its collapse load can be verified by running a large refined model remotely from behind the workstation with one of the current generation 2-dimensional codes, with advanced capabilities to handle both geometric and material nonlinearities.

  15. Use of logic flowgraph models in a computer aided process analysis and management system

    International Nuclear Information System (INIS)

    The development of a multi-function computer-aided process analysis and management (CAPAM) system, to be implemented in nuclear power plant control rooms, is proposed and discussed. The design goals identified for such a system are early disturbance detection and diagnosis, accompanied by identification of the best possible recovery actions or alternative success paths. The CAPAM structure is articulated in three functional levels with dedicated CRT displays. Increasing amount of diagnostic or recovery information is made available to the operators at the lower display levels. Probabilistic safety margins to the loss of important safety functions may be also calculated. The proposed implementation of the CAPAM concept is based on the use of logic flowgraph networks for the more detailed system modeling. Examples of such an implementation are given. 7 refs., 3 figs., 2 tabs

  16. Function-Oriented Mobile Malware Analysis as First Aid

    Directory of Open Access Journals (Sweden)

    Jae-wook Jang

    2016-01-01

    Full Text Available Recently, highly well-crafted mobile malware has arisen as mobile devices manage highly valuable and sensitive information. Currently, it is impossible to detect and prevent all malware because the amount of new malware continues to increase exponentially; malware detection methods need to improve in order to respond quickly and effectively to malware. For the quick response, revealing the main purpose or functions of captured malware is important; however, only few recent works have attempted to find malware’s main purpose. Our approach is designed to help with efficient and effective incident responses or countermeasure development by analyzing the main functions of malicious behavior. In this paper, we propose a novel method for function-oriented malware analysis approach based on analysis of suspicious API call patterns. Instead of extracting API call patterns for malware in each family, we focus on extracting such patterns for certain malicious functionalities. Our proposed method dumps memory sections where an application is allocated and extracts suspicious API sequences from bytecode by comparing with predefined suspicious API lists. By matching API call patterns with our functionality database, our method determines whether they are malicious. The experiment results demonstrate that our method performs well in detecting malware with high accuracy.

  17. Design and implementation of a bluetooth-based band-aid pulse rate sensor

    Science.gov (United States)

    Kumar, Prashanth S.; Oh, Sechang; Rai, Pratyush; Kwon, Hyeokjun; Banerjee, Nilanjan; Varadan, Vijay K.

    2011-04-01

    Remote patient monitoring systems capable of collecting vital patient data such as blood pressure readings, Electrocardiograph (ECG) waveforms, and heart rate can obviate the need for repeated visits to the hospital. Moreover, such systems that continuously monitor the human physiology can provide valuable data to prognosticate the onset of critical health problems. The key to such remote health diagnostics is the design of minimally intrusive, low cost sensors that do not impede a patient's quotidian life but at the same time collect reliable noise free data. To this end, in this paper, we design and implement a Bluetooth-based wireless sensor system with a disposable sensor element and a reusable wireless component that can be worn as a "band-aid". The sensor is a piezoelectric polymer film placed on the wrist in proximity to the radial artery. The band-aid sized sensor allows non-intrusive monitoring of the pulsatile flow of blood in the artery. The sensor, using the Bluetooth module, can communicate with any Bluetooth enabled computer, mobile phone, or PDA. The data collected from the patient can be remotely viewed and analyzed by a physician.

  18. Modern numerical techniques and software for photo- and thermoemission electron optical systems computer-aided design

    Science.gov (United States)

    Monastyrski, Mikhail A.; Andreev, Sergei V.; Gaidukova, Inna S.; Tarasov, Victor A.; Filachev, Anatoly M.

    1997-09-01

    The paper is devoted to software development for simulation, optimization, and computer-aided design of photo/thermo- emission electron optical systems and units. The first part of the paper presents the applied program package (APP) 'ELIMDYNAMICS\\ intended for computer-aided design of dynamic photo-emission image tubes with electro/magnetostatic focusing and deflection (streak tubes). The developed software allows highly precise computation of basic image quality characteristics both in static and streak modes. One of the main advantages of the new program version presented is that 'through' electron beam computation from the photocathode to image receiver is available with regard to dynamic aberrations caused by scattering fields located nearby the edges of deflecting plates. In the second part, the possibility is shown to generalize some numerical techniques being effectively applied in photo-emission imaging electron optics (namely, the (tau) -variation - and the first kind integral equations techniques) to simulation of the thermo-emission electron beam technology units. Functions of the new APP 'CHARGE' are presented, and some numerical aspects of the self-coordinated problem are discussed.

  19. Computer-aided Molecular Design of Compounds Targeting Histone Modifying Enzymes

    Directory of Open Access Journals (Sweden)

    Federico Andreoli

    2015-01-01

    Full Text Available Growing evidences show that epigenetic mechanisms play crucial roles in the genesis and progression of many physiopathological processes. As a result, research in epigenetic grew at a fast pace in the last decade. In particular, the study of histone post-translational modifications encountered an extraordinary progression and many modifications have been characterized and associated to fundamental biological processes and pathological conditions. Histone modifications are the catalytic result of a large set of enzyme families that operate covalent modifications on specific residues at the histone tails. Taken together, these modifications elicit a complex and concerted processing that greatly contribute to the chromatin remodeling and may drive different pathological conditions, especially cancer. For this reason, several epigenetic targets are currently under validation for drug discovery purposes and different academic and industrial programs have been already launched to produce the first pre-clinical and clinical outcomes. In this scenario, computer-aided molecular design techniques are offering important tools, mainly as a consequence of the increasing structural information available for these targets. In this mini-review we will briefly discuss the most common types of known histone modifications and the corresponding operating enzymes by emphasizing the computer-aided molecular design approaches that can be of use to speed-up the efforts to generate new pharmaceutically relevant compounds.

  20. Teaching Sustainable Process Design Using 12 Systematic Computer-Aided Tasks

    DEFF Research Database (Denmark)

    Babi, Deenesh K.

    2015-01-01

    In this paper a task-based approach for teaching (sustainable) process design to students pursuing a degree in chemical and biochemical engineering is presented. In tasks 1-3 the student makes design decisions for product and process selection followed by simple and rigorous model simulations...... (tasks 4-7) and then sizing, costing and economic analysis of the designed process (tasks 8-9). This produces a base case design. In tasks 10-12, the student explores opportunities for heat and/or mass integration, followed by a sustainability analysis, in order to evaluate the base case design and set...

  1. Designing optimal transportation networks: a knowledge-based computer-aided multicriteria approach

    Energy Technology Data Exchange (ETDEWEB)

    Tung, S.I.

    1986-01-01

    The dissertation investigates the applicability of using knowledge-based expert systems (KBES) approach to solve the single-mode (automobile), fixed-demand, discrete, multicriteria, equilibrium transportation-network-design problem. Previous works on this problem has found that mathematical programming method perform well on small networks with only one objective. Needed is a solution technique that can be used on large networks having multiple, conflicting criteria with different relative importance weights. The KBES approach developed in this dissertation represents a new way to solve network design problems. The development of an expert system involves three major tasks: knowledge acquisition, knowledge representation, and testing. For knowledge acquisition, a computer aided network design/evaluation model (UFOS) was developed to explore the design space. This study is limited to the problem of designing an optimal transportation network by adding and deleting capacity increments to/from any link in the network. Three weighted criteria were adopted for use in evaluating each design alternative: cost, average V/C ratio, and average travel time.

  2. Computer-aided design in power engineering. Application of software tools

    International Nuclear Information System (INIS)

    Demonstrates the use software tools in the practice of design in the field of power systems. Presents many applications in the design in the field of power systems. Useful for educative purposes and practical work. This textbooks demonstrates the application of software tools in solving a series of problems from the field of designing power system structures and systems. It contains four chapters: The first chapter leads the reader through all the phases necessary in the procedures of computer aided modeling and simulation. It guides through the complex problems presenting on the basis of eleven original examples. The second chapter presents application of software tools in power system calculations of power systems equipment design. Several design example calculations are carried out using engineering standards like MATLAB, EMTP/ATP, Excel and Access, AutoCAD and Simulink. The third chapters focuses on the graphical documentation using a collection of software tools (AutoCAD, EPLAN, SIMARIS SIVACON, SIMARIS DESIGN) which enable the complete automation of the development of graphical documentation of a power systems. In the fourth chapter, the application of software tools in the project management in power systems is discussed. Here, the emphasis is put on the standard software MS Excel and MS Project.

  3. Simulation-aided design and fabrication of nanoprobes for scanning probe microscopy

    International Nuclear Information System (INIS)

    We proposed and demonstrated a flexible and effective method to design and fabricate scanning probes for atomic force microscopy applications. Computer simulations were adopted to evaluate design specifications and desired performance of atomic force microscope (AFM) probes; the fabrication processes were guided by feedback from simulation results. Through design-simulation-fabrication iterations, tipless cantilevers and tapping mode probes were successfully made with errors as low as 2% in designed resonant frequencies. For tapping mode probes, the probe tip apex achieved a 10 nm radius of curvature without additional sharpening steps; tilt-compensated probes were also fabricated for better scanning performance. This method provides AFM users improved probe quality and practical guidelines for customized probes, which can support the development of novel scanning probe microscopy (SPM) applications. -- Research highlights: → We developed a design-simulation-fabrication strategy for customized AFM/SPM probes and demonstrated the results of tipless cantilever, sharpened probe tip, and tilt-compensated probe. → This simulation-aided method improved the geometry control and performance prediction of AFM probes; the error in resonant frequency was reduced to ∼2%. → Integration of simulation in design and fabrication of AFM probes expedites development of new probes and consequently promotes novel SPM applications.

  4. Computer-aided design in power engineering. Application of software tools

    Energy Technology Data Exchange (ETDEWEB)

    Stojkovic, Zlatan

    2012-07-01

    Demonstrates the use software tools in the practice of design in the field of power systems. Presents many applications in the design in the field of power systems. Useful for educative purposes and practical work. This textbooks demonstrates the application of software tools in solving a series of problems from the field of designing power system structures and systems. It contains four chapters: The first chapter leads the reader through all the phases necessary in the procedures of computer aided modeling and simulation. It guides through the complex problems presenting on the basis of eleven original examples. The second chapter presents application of software tools in power system calculations of power systems equipment design. Several design example calculations are carried out using engineering standards like MATLAB, EMTP/ATP, Excel and Access, AutoCAD and Simulink. The third chapters focuses on the graphical documentation using a collection of software tools (AutoCAD, EPLAN, SIMARIS SIVACON, SIMARIS DESIGN) which enable the complete automation of the development of graphical documentation of a power systems. In the fourth chapter, the application of software tools in the project management in power systems is discussed. Here, the emphasis is put on the standard software MS Excel and MS Project.

  5. LIFESPAN: A Tool for the Computer-Aided Design of Longitudinal Studies

    Directory of Open Access Journals (Sweden)

    Andreas M Brandmaier

    2015-03-01

    Full Text Available Researchers planning a longitudinal study typically search, more or less informally, a multivariate space of possible study designs that include dimensions such as the hypothesized true variance in change, indicator reliability, the number and spacing of measurement occasions, total study time, and sample size. The main search goal is to select a research design that best addresses the guiding questions and hypotheses of the planned study while heeding applicable external conditions and constraints, including time, money, feasibility, and ethical considerations. Because longitudinal study selection ultimately requires optimization under constraints, it is amenable to the general operating principles of optimization in computer-aided design. Based on power equivalence theory (MacCallum et al., 2010; von Oertzen, 2010, we propose a computational framework to promote more systematic searches within the study design space. Starting with an initial design, the proposed framework generates a set of alternative models with equal statistical power for detecting hypothesized effects, and delineates tradeoff relations among relevant parameters, such as total study time and the number of measurement occasions. We present LIFESPAN (Longitudinal Interactive Front End Study Planner that implements this framework. LIFESPAN boosts the efficiency, breadth, and precision of the search for optimal longitudinal designs. Its initial version, which is freely available at http://www.brandmaier.de/lifespan, is geared towards the power to detect variance in change as specified in a linear latent growth curve model.

  6. Three-dimensional computer-aided design system for plant layout

    International Nuclear Information System (INIS)

    A three-dimensional CAD system for plant layout of nuclear power plants has been developed, adopting the latest technologies of knowledge engineering, CAD/CAM, and interactive computer graphics. With this system, Hitachi is now able to plan plant layout more effectively, reduce design time and cost, and detect defective designs before actual construction problems occur. Hitachi is planning to enhance this three-dimensional CAD system to a plant total life computer-aided engineering (CAE) system. This system will include a construction CAE system, a test operation and in-service inspection control system, and a plant maintenance system. After completion of this system, Hitachi will be able to plan, monitor, and control all major aspects in the life of a nuclear power plant from the very first stage of the planning to its decommissioning

  7. Computer aided design of free-machinability prehardened mold steel for plastic

    Institute of Scientific and Technical Information of China (English)

    HE Yan-lin; LI Lin; GAO Wen; WANG Qing-liang; WU Xiao-chun

    2005-01-01

    In order to improve the machinability but not to impair other properties of the prehardened mold steel for plastic, the composition was designed by application of Thermo-Calc software package to regulate the type of nonmetallic inclusion formed in the steel. The regulated non-metallic inclusion type was also observed by SEM and EDX. Then the maehinability assessment of the steel with designed composition under different conditions was studied by the measurement of tool wear amount and cutting force. The results show that the composition of free cutting elements adding to mold steel for plastic can be optimized to obtain proper type of non-metallic inclusion in the aid of Thermo-Calc, compared with the large volume fraction of soft inclusion which is needed for promoting ductile fracture at low cutting speeds, the proper type of inclusion at high cutting speeds is glassy oxide inclusion. All those can be obtained in the present work.

  8. Computer-aided design and distributed system technology development for large space structures

    Science.gov (United States)

    Armstrong, Ernest S.; Joshi, Suresh M.

    1986-01-01

    Proposed large space structures have many characteristics that make them difficult to analyze and control. They are highly flexible, with components mathematically modeled by partial differential equations or very large systems of ordinary differential equations. They have many resonant frequencies, typically low and closely spaced. Natural damping may be low and/or improperly modeled. Coupled with stringent operational requirements of orientation, shape control, and vibration suppression, and the inability to perform adequate ground testing, these characteristics present an unconventional identification and control design problem to the systems theorist. Some of the research underway within Langley's Spacecraft Control Branch, Guidance and Control Division aimed at developing theory and algorithms to treat large space structures systems identification and control problems is described. The research areas to be considered are computer-aided design algorithms, and systems identification and control of distributed systems.

  9. Computer aided design and manufacturing of composite propfan blades for a cruise missile wind tunnel model

    Science.gov (United States)

    Thorp, Scott A.; Downey, Kevin M.

    1992-01-01

    One of the propulsion concepts being investigated for future cruise missiles is advanced unducted propfans. To support the evaluation of this technology applied to the cruise missile, a joint DOD and NASA test project was conducted to design and then test the characteristics of the propfans on a 0.55-scale, cruise missile model in a NASA wind tunnel. The configuration selected for study is a counterrotating rearward swept propfan. The forward blade row, having six blades, rotates in a counterclockwise direction, and the aft blade row, having six blades, rotates in a clockwise direction, as viewed from aft of the test model. Figures show the overall cruise missile and propfan blade configurations. The objective of this test was to evaluate propfan performance and suitability as a viable propulsion option for next generation of cruise missiles. This paper details the concurrent computer aided design, engineering, and manufacturing of the carbon fiber/epoxy propfan blades as the NASA Lewis Research Center.

  10. Computer-Aided Molecular Design of Bis-phosphine Oxide Lanthanide Extractants.

    Science.gov (United States)

    McCann, Billy W; Silva, Nuwan De; Windus, Theresa L; Gordon, Mark S; Moyer, Bruce A; Bryantsev, Vyacheslav S; Hay, Benjamin P

    2016-06-20

    Computer-aided molecular design and high-throughput screening of viable host architectures can significantly reduce the efforts in the design of novel ligands for efficient extraction of rare earth elements. This paper presents a computational approach to the deliberate design of bis-phosphine oxide host architectures that are structurally organized for complexation of trivalent lanthanides. Molecule building software, HostDesigner, was interfaced with molecular mechanics software, PCModel, providing a tool for generating and screening millions of potential R2(O)P-link-P(O)R2 ligand geometries. The molecular mechanics ranking of ligand structures is consistent with both the solution-phase free energies of complexation obtained with density functional theory and the performance of known bis-phosphine oxide extractants. For the case where the link is -CH2-, evaluation of the ligand geometry provides the first characterization of a steric origin for the "anomalous aryl strengthening" effect. The design approach has identified a number of novel bis-phosphine oxide ligands that are better organized for lanthanide complexation than previously studied examples. PMID:26883005

  11. Using the Continuum of Design Modelling Techniques to Aid the Development of CAD Modeling Skills in First Year Industrial Design Students

    Science.gov (United States)

    Storer, I. J.; Campbell, R. I.

    2012-01-01

    Industrial Designers need to understand and command a number of modelling techniques to communicate their ideas to themselves and others. Verbal explanations, sketches, engineering drawings, computer aided design (CAD) models and physical prototypes are the most commonly used communication techniques. Within design, unlike some disciplines,…

  12. The adolescent sexual world and AIDS prevention: a democratic approach to programme design in Zimbabwe.

    Science.gov (United States)

    Schatz, P; Dzvimbo, K P

    2001-06-01

    The main aim of this study was to redress the under-representation of adolescent attitudes in AIDS prevention programme design and to discuss the implications of a democratic sexuality education approach within a health promotion context. The study surveyed the attitudes of adolescents (average age 16 years) on sex-related topics such as culture, marriage, sexual behaviour and sex education, identified similarities and differences in attitudes according to gender and socio-economic environments, and examined sources of students' knowledge of selected sex-related topics. Questionnaires were completed by 3429 secondary school students from different backgrounds. Findings showed significant differences in attitude related to gender and socio-economic settings and also in sources of information. The study drew on a democratic sexuality education approach. Using this approach, adolescents review ideological perspectives and decide which are most appropriate for them as guides in making decisions about their own lives. This type of education is fully consistent with the principles of democratic living and gives guidance to teenagers who are trying to decide how to live a healthy life. Study results suggest that programmers would be well advised to collect information from the adolescents' psycho-social-economic environment and link it with good governance and civil society strategies in developing AIDS prevention programmes that involve the adolescent in making lifestyle decisions. To achieve a more supportive environment for AIDS prevention, this approach can link adolescent attitudes and health promotion action to advocate for public policy reform, gender equality, multi-dimensional partnerships and social marketing. PMID:11356751

  13. Computer-aided analysis of bypass in direct vessel vertical injection system

    International Nuclear Information System (INIS)

    Recent advances in three-dimensional computer-aided design has rendered it practicable to lend itself to commercial computational fluid dynamics and structural mechanics finite element analysis codes to cross-communicate detailed geometric data. The main focus is placed on application of this powerful design tool in examining performance of the emergency core cooling system (ECCS) employing the direct vessel injection (DVI) in the APR1400 (Advanced Power Reactor 1400 MWe). In this work a new method of direct vessel vertical injection (DVVI) is proposed as an advanced type of DVI for the APR1400. In view of the ECCS function to efficaciously cool down the core during a loss-of-coolant accident (LOCA), for example, the concept of DVVI is geared to increasing the downward momentum of the injected water so as to maximize penetration into the downcomer versus by pass through the break. Furthermore, one needs to pay a special attention to the structural integrity of the injection nozzle on account of the radioactive primary system environment. In particular, vibration and pressure induced by the safety injection (SI) flow will tend to exert predomination forces onto the DVVI nozzles having an elbow. Therefore, in this work, focus is placed on the flow regime at the tip of the DVVI nozzle and the structural impact caused by rapid injection of the emergency core cooling (ECC) water in the APR1400. The current work consists of a three-dimensional (3D) computer-aided design (CAD) modeling using CATIA V5R9, CFX 5.5 and ANSYS 6.1 to determine the most vulnerable spot of the DVVI nozzle, and to check on the performance efficiency of DVVI during the ECC injection period. In this study it was considered that the 3D CAD model for the DVVI nozzle was submerged in a high-velocity steam. The effect of the rebounding force of the injected water has also been simulated. The 3D CAD model for the DVVI nozzle simulates its mass, texture and constitution material. In this work the DVVI

  14. Does Federal Financial Aid Policy Influence the Institutional Aid Policies of Four-Year Colleges and Universities? An Exploratory Analysis

    Science.gov (United States)

    Hossler, Don; Kwon, Jihye

    2015-01-01

    There is a dearth of empirical work that examines the relationships between federal financial aid policy and institutional financial aid priorities and expenditures. This study uses Resource Dependency Theory to explore whether changes the amount of financial aid awarded by colleges and universities during the last fifty years are best explained…

  15. Radiation transport analysis with the aid of CAD/CAM

    International Nuclear Information System (INIS)

    The determination of radiation exposure to sensitive parts in spacecraft involves complex shielding configurations and multi-directional exposures. Ray tracing is commonly used to determine shielding along different directions for transport calculations and dose conversions. Ray tracing requires geometric modeling of the spacecraft, structures, equipment and enclosures. Modeling by manual procedures is inefficient and slow. Combinatorial geometry codes are a substantial improvement over manual procedures but modeling a spacecraft and its contents can take many man months; and still involves many approximations. The increasing use of CAD/CAM in engineering and design results in the convenient accessibility of geometric modeling data. A CAD/CAM system, CADAM, was used to develop an ancillary program which provides one-dimensional ray trace information from CADAM models. The resultant ray trace information is used in subsequent transport analysis on a DEC computer. The result is a timesavings of man-months, by utilizing an existing data base and an increase in accuracy by using up-to-date geometrical information

  16. Extracellular space preservation aids the connectomic analysis of neural circuits

    Science.gov (United States)

    Pallotto, Marta; Watkins, Paul V; Fubara, Boma; Singer, Joshua H; Briggman, Kevin L

    2015-01-01

    Dense connectomic mapping of neuronal circuits is limited by the time and effort required to analyze 3D electron microscopy (EM) datasets. Algorithms designed to automate image segmentation suffer from substantial error rates and require significant manual error correction. Any improvement in segmentation error rates would therefore directly reduce the time required to analyze 3D EM data. We explored preserving extracellular space (ECS) during chemical tissue fixation to improve the ability to segment neurites and to identify synaptic contacts. ECS preserved tissue is easier to segment using machine learning algorithms, leading to significantly reduced error rates. In addition, we observed that electrical synapses are readily identified in ECS preserved tissue. Finally, we determined that antibodies penetrate deep into ECS preserved tissue with only minimal permeabilization, thereby enabling correlated light microscopy (LM) and EM studies. We conclude that preservation of ECS benefits multiple aspects of the connectomic analysis of neural circuits. DOI: http://dx.doi.org/10.7554/eLife.08206.001 PMID:26650352

  17. Synthetic tetracycline-inducible regulatory networks: computer-aided design of dynamic phenotypes

    Directory of Open Access Journals (Sweden)

    Kaznessis Yiannis N

    2007-01-01

    Full Text Available Abstract Background Tightly regulated gene networks, precisely controlling the expression of protein molecules, have received considerable interest by the biomedical community due to their promising applications. Among the most well studied inducible transcription systems are the tetracycline regulatory expression systems based on the tetracycline resistance operon of Escherichia coli, Tet-Off (tTA and Tet-On (rtTA. Despite their initial success and improved designs, limitations still persist, such as low inducer sensitivity. Instead of looking at these networks statically, and simply changing or mutating the promoter and operator regions with trial and error, a systematic investigation of the dynamic behavior of the network can result in rational design of regulatory gene expression systems. Sophisticated algorithms can accurately capture the dynamical behavior of gene networks. With computer aided design, we aim to improve the synthesis of regulatory networks and propose new designs that enable tighter control of expression. Results In this paper we engineer novel networks by recombining existing genes or part of genes. We synthesize four novel regulatory networks based on the Tet-Off and Tet-On systems. We model all the known individual biomolecular interactions involved in transcription, translation, regulation and induction. With multiple time-scale stochastic-discrete and stochastic-continuous models we accurately capture the transient and steady state dynamics of these networks. Important biomolecular interactions are identified and the strength of the interactions engineered to satisfy design criteria. A set of clear design rules is developed and appropriate mutants of regulatory proteins and operator sites are proposed. Conclusion The complexity of biomolecular interactions is accurately captured through computer simulations. Computer simulations allow us to look into the molecular level, portray the dynamic behavior of gene regulatory

  18. Task analysis and computer aid development for human reliability analysis in nuclear power plants

    Energy Technology Data Exchange (ETDEWEB)

    Yoon, W. C.; Kim, H.; Park, H. S.; Choi, H. H.; Moon, J. M.; Heo, J. Y.; Ham, D. H.; Lee, K. K.; Han, B. T. [Korea Advanced Institute of Science and Technology, Taejeon (Korea)

    2001-04-01

    Importance of human reliability analysis (HRA) that predicts the error's occurrence possibility in a quantitative and qualitative manners is gradually increased by human errors' effects on the system's safety. HRA needs a task analysis as a virtue step, but extant task analysis techniques have the problem that a collection of information about the situation, which the human error occurs, depends entirely on HRA analyzers. The problem makes results of the task analysis inconsistent and unreliable. To complement such problem, KAERI developed the structural information analysis (SIA) that helps to analyze task's structure and situations systematically. In this study, the SIA method was evaluated by HRA experts, and a prototype computerized supporting system named CASIA (Computer Aid for SIA) was developed for the purpose of supporting to perform HRA using the SIA method. Additionally, through applying the SIA method to emergency operating procedures, we derived generic task types used in emergency and accumulated the analysis results in the database of the CASIA. The CASIA is expected to help HRA analyzers perform the analysis more easily and consistently. If more analyses will be performed and more data will be accumulated to the CASIA's database, HRA analyzers can share freely and spread smoothly his or her analysis experiences, and there by the quality of the HRA analysis will be improved. 35 refs., 38 figs., 25 tabs. (Author)

  19. Computer aided design on the Tandem Mirror Experiment Upgrade (TMX-U)

    International Nuclear Information System (INIS)

    The Tandem Mirror Experiment-Upgrade (TMX-U) at Lawrence Livermore National Laboratory (LLNL) has been using a Computer Aided Design (CAD) graphics system to enhance its design capabilities since November of 1984. Three-dimensional models of the TMX-U magnet set, neutral beams, plasma, and containment vessel have been modeled on the system. These models are used for location verification, diagnostic placement, interference checking, and visualization of complex shapes generated on the Magnetic Fusion Energy Computer Center (MFECC) mainframes. The graphics system used at LLNL is a Computervision multi-application graphics system. Four other fusion laboratories, Princeton, Oak Ridge, General Atomic, and Los Alamos, have purchased this same CAD system. These sites are linked through the MFE computer network to allow for the exchange of design files and the transfer of physics and engineering data to and from the CAD systems. This paper gives examples of how the CAD system has been used to solve design and engineering problems for the TMX-U

  20. [Evaluation of national prevention campaigns against AIDS: analysis model].

    Science.gov (United States)

    Hausser, D; Lehmann, P; Dubois, F; Gutzwiller, F

    1987-01-01

    The evaluation of the "Stop-Aids" campaign is based upon a model of behaviour modification (McAlister) which includes the communication theory of McGuire and the social learning theory of Bandura. Using this model, it is possible to define key variables that are used to measure the impact of the campaign. Process evaluation allows identification of multipliers that reinforce and confirm the initial message of prevention (source) thereby encouraging behaviour modifications that are likely to reduce the transmission of HIV (condom use, no sharing of injection material, monogamous relationship, etc.). Twelve studies performed by seven teams in the three linguistic areas contribute to the project. A synthesis of these results will be performed by the IUMSP. PMID:3687209

  1. Validation of space/ground antenna control algorithms using a computer-aided design tool

    Science.gov (United States)

    Gantenbein, Rex E.

    1995-01-01

    The validation of the algorithms for controlling the space-to-ground antenna subsystem for Space Station Alpha is an important step in assuring reliable communications. These algorithms have been developed and tested using a simulation environment based on a computer-aided design tool that can provide a time-based execution framework with variable environmental parameters. Our work this summer has involved the exploration of this environment and the documentation of the procedures used to validate these algorithms. We have installed a variety of tools in a laboratory of the Tracking and Communications division for reproducing the simulation experiments carried out on these algorithms to verify that they do meet their requirements for controlling the antenna systems. In this report, we describe the processes used in these simulations and our work in validating the tests used.

  2. Design and application of location error teaching aids in measuring and visualization

    Directory of Open Access Journals (Sweden)

    Yu Fengning

    2015-01-01

    Full Text Available As an abstract concept, ‘location error’ in is considered to be an important element with great difficult to understand and apply. The paper designs and develops an instrument to measure the location error. The location error is affected by different position methods and reference selection. So we choose position element by rotating the disk. The tiny movement transfers by grating ruler and programming by PLC can show the error on text display, which also helps students understand the position principle and related concepts of location error. After comparing measurement results with theoretical calculations and analyzing the measurement accuracy, the paper draws a conclusion that the teaching aid owns reliability and a promotion of high value.

  3. Alzheimer's disease drug development based on Computer-Aided Drug Design.

    Science.gov (United States)

    Zeng, Huahui; Wu, Xiangxiang

    2016-10-01

    Alzheimer's disease (AD) is a common neurodegenerative disorder characterized by the excessive deposition of amyloids in the brain. The pathological features mainly include the extracellular amyloid plaques and intracellular neurofibrillary tangles, which are the production of amyloid precursor protein (APP) processed by the α-, β- and γ-secretases. Based on the amyloid cascade hypotheses of AD, a large number of amyloid-β agents and secretase inhibitors against AD have been recently developed by using computational methods. This review article describes pathophysiology of AD and the structure of the Aβ plaques, β- and γ-secretases, and discusses the recent advances in the development of the amyloid agents for AD therapy and diagnosis by using Computer-Aided Drug Design approach. PMID:26415837

  4. Computer aided molecular design with combined molecular modeling and group contribution

    DEFF Research Database (Denmark)

    Harper, Peter Mathias; Gani, Rafiqul; Kolar, Petr;

    1999-01-01

    and on the availability of suitable models for property prediction. A new CAMD methodology that addresses this issue by combining molecular modeling techniques with a traditional CAMD approach is presented. The new method includes a new molecular/atomic structure generation algorithm, a large collection of property...... estimation methods, and, a link to molecular modelling tools. Application of the new CAMD method is highlighted through two industrial examples. (C) 1999 Elsevier Science B.V. All rights reserved.......Computer-aided molecular design (CAMD) provides a means for determining molecules or mixtures of molecules (CAMMD) having a desirable set of physicochemical properties. The application range of CAMD is restricted due to limitations on the complexity of the generated molecular structures...

  5. Formal computer-aided product family architecture design for mass customization

    DEFF Research Database (Denmark)

    Bonev, Martin; Hvam, Lars; Clarkson, John;

    2015-01-01

    are informal, providing limited support for domain experts to communicate, synthesize and document architectures effectively. In single product design explicit visual models such as design structure matrices and node-link diagrams have been used in combination with structural analysis methods to...

  6. A Framework for Web-Based Mechanical Design and Analysis

    Institute of Scientific and Technical Information of China (English)

    Chiaming; Yen; Wujeng; Li

    2002-01-01

    In this paper, a Web-based Mechanical Design and A na lysis Framework (WMDAF) is proposed. This WMADF allows designers to develop web -based computer aided programs in a systematic way during the collaborative mec hanical system design and analysis process. This system is based on an emerg ing web-based Content Management System (CMS) called eXtended Object Oriented P ortal System (XOOPS). Due to the Open Source Status of the XOOPS CMS, programs d eveloped with this framework can be further customized to ...

  7. 75 FR 10799 - Transitions Optical, Inc.; Analysis to Aid Public Comment

    Science.gov (United States)

    2010-03-09

    ... Transitions Optical, Inc.; Analysis to Aid Public Comment AGENCY: Federal Trade Commission. ACTION: Proposed... prohibiting unfair or deceptive acts or practices or unfair methods of competition. The attached Analysis to... equivalent; passport number; financial account number; or credit or debit card number. Comments also...

  8. Design and Implementation of 3 Axis CNC Router for Computer Aided Manufacturing Courses

    Directory of Open Access Journals (Sweden)

    Aktan Mehmet Emin

    2016-01-01

    Full Text Available In this paper, it is intended to make the mechanical design of 3 axis Computer Numerical Control (CNC router with linear joints, production of electronic control interface cards and drivers and manufacturing of CNC router system which is a combination of mechanics and electronics. At the same time, interface program has been prepared to control router via USB. The router was developed for educational purpose. In some vocational schools and universities, Computer Aided Manufacturing (CAM courses are though rather theoretical. This situation cause ineffective and temporary learning. Moreover, students at schools which have the opportunity to apply for these systems can face with various dangerous accidents. Because of this situation, these students start to get knowledge about this system for the first time. For the first steps of CNC education, using smaller and less dangerous systems will be easier. A new concept CNC machine and its user interface suitable and profitable for education have been completely designed and realized during this study. To test the validity of the hypothesis which the benefits that may exist on the educational life, enhanced traditional education method with the contribution of the designed machine has been practiced on CAM course students for a semester. At the end of the semester, the new method applied students were more successful in the rate of 27.36 percent both in terms of verbal comprehension and exam grades.

  9. Comparative study of auxetic geometries by means of computer-aided design and engineering

    International Nuclear Information System (INIS)

    Auxetic materials (or metamaterials) are those with a negative Poisson ratio (NPR) and display the unexpected property of lateral expansion when stretched, as well as an equal and opposing densification when compressed. Such geometries are being progressively employed in the development of novel products, especially in the fields of intelligent expandable actuators, shape morphing structures and minimally invasive implantable devices. Although several auxetic and potentially auxetic geometries have been summarized in previous reviews and research, precise information regarding relevant properties for design tasks is not always provided. In this study we present a comparative study of two-dimensional and three-dimensional auxetic geometries carried out by means of computer-aided design and engineering tools (from now on CAD–CAE). The first part of the study is focused on the development of a CAD library of auxetics. Once the library is developed we simulate the behavior of the different auxetic geometries and elaborate a systematic comparison, considering relevant properties of these geometries, such as Poisson ratio(s), maximum volume or area reductions attainable and equivalent Young’s modulus, hoping it may provide useful information for future designs of devices based on these interesting structures. (paper)

  10. Investigation into the development of computer aided design software for space based sensors

    Science.gov (United States)

    Pender, C. W.; Clark, W. L.

    1987-01-01

    The described effort is phase one of the development of a Computer Aided Design (CAD) software to be used to perform radiometric sensor design. The software package will be referred to as SCAD and is directed toward the preliminary phase of the design of space based sensor system. The approach being followed is to develop a modern, graphic intensive, user friendly software package using existing software as building blocks. The emphasis will be directed toward the development of a shell containing menus, smart defaults, and interfaces, which can accommodate a wide variety of existing application software packages. The shell will offer expected utilities such as graphics, tailored menus, and a variety of drivers for I/O devices. Following the development of the shell, the development of SCAD is planned as chiefly selection and integration of appropriate building blocks. The phase one development activities have included: the selection of hardware which will be used with SCAD; the determination of the scope of SCAD; the preliminary evaluation of a number of software packages for applicability to SCAD; determination of a method for achieving required capabilities where voids exist; and then establishing a strategy for binding the software modules into an easy to use tool kit.

  11. A QFD-based decision making model for computer-aided design software selection

    Directory of Open Access Journals (Sweden)

    Kanika Prasad

    2016-03-01

    Full Text Available With the progress in technology and innovation in product development, the contribution of computer- aided design (CAD software in the design and manufacture of parts/products is growing on significantly. Selection of an appropriate CAD software is not a trifling task as it involves analyzing the appositeness of the available software packages to the unique requirements of the organization. Existence of a large number of CAD software vendors, presence of discordance among different hardware and software systems, and dearth of technical knowledge and experience of the decision makers further complicate the selection procedure. Moreover, there are very few published research papers related to CAD software selection, and majority of them have either employed criteria weights computed utilizing subjective judgements of the end users or floundered to incorporate the voice of customers in the decision making process. Quality function deployment (QFD is a well-known technique for determining the relative importance of customers’ defined criteria for selection of any product or service. Therefore, this paper deals with design and development of a QFD-based decision making model in Visual BASIC 6.0 for selection of CAD software for manufacturing organizations. In order to demonstrate the applicability and potentiality of the developed model in the form of a software prototype, two illustrative examples are also provided.

  12. Computer-aided design of novel HIV-1 entry inhibitors blocking the virus envelope gp120 V3 loop

    Directory of Open Access Journals (Sweden)

    Tuzikov A. V.

    2012-12-01

    Full Text Available Aim. The object of this study was to implement computer-aided design of the water-soluble analog of glycolipid β -galactosylceramide (β-GalCer, which presents a potential HIV-1 entry inhibitor, by the analysis of intermolecular interactions of β-GalCer with the central region of the virus envelope gp120 V3 loop followed by synthesis of this glycolipid derivative and testing for antiviral activity. Methods. To reach the object of view, computer modeling procedures, such as quantum chemical calculations, molecular docking, molecular dynamics and free energy simulations, were involved in the studies in conjunction with chemical synthesis and anti-HIV-1 assay methods. Results. As a result, the high probability of exhibiting of antiviral activity was predicted for the designed β-GalCer analog. The data of molecular modeling were confirmed by those of primary medical trials of the synthesized compound. Conclusions. In the light of the findings obtained, the designed analog of β-GalCer may be considered as the basic structure for simulation of its more potent structural forms and for posterior selection of drug candidates most promising for synthesis and anti-HIV-1 assays.

  13. Analysis of digester design concepts

    Energy Technology Data Exchange (ETDEWEB)

    Ashare, E.; Wilson, E. H.

    1979-01-29

    Engineering economic analyses were performed on various digester design concepts to determine the relative performance for various biomass feedstocks. A comprehensive literature survey describing the state-of-the-art of the various digestion designs is included. The digester designs included in the analyses are CSTR, plug flow, batch, CSTR in series, multi-stage digestion and biomethanation. Other process options investigated included pretreatment processes such as shredding, degritting, and chemical pretreatment, and post-digestion processes, such as dewatering and gas purification. The biomass sources considered include feedlot manure, rice straw, and bagasse. The results of the analysis indicate that the most economical (on a unit gas cost basis) digester design concept is the plug flow reactor. This conclusion results from this system providing a high gas production rate combined with a low capital hole-in-the-ground digester design concept. The costs determined in this analysis do not include any credits or penalties for feedstock or by-products, but present the costs only for conversion of biomass to methane. The batch land-fill type digester design was shown to have a unit gas cost comparable to that for a conventional stirred tank digester, with the potential of reducing the cost if a land-fill site were available for a lower cost per unit volume. The use of chemical pretreatment resulted in a higher unit gas cost, primarily due to the cost of pretreatment chemical. A sensitivity analysis indicated that the use of chemical pretreatment could improve the economics provided a process could be developed which utilized either less pretreatment chemical or a less costly chemical. The use of other process options resulted in higher unit gas costs. These options should only be used when necessary for proper process performance, or to result in production of a valuable by-product.

  14. Quantitative analysis of ultrasound images for computer-aided diagnosis.

    Science.gov (United States)

    Wu, Jie Ying; Tuomi, Adam; Beland, Michael D; Konrad, Joseph; Glidden, David; Grand, David; Merck, Derek

    2016-01-01

    We propose an adaptable framework for analyzing ultrasound (US) images quantitatively to provide computer-aided diagnosis using machine learning. Our preliminary clinical targets are hepatic steatosis, adenomyosis, and craniosynostosis. For steatosis and adenomyosis, we collected US studies from 288 and 88 patients, respectively, as well as their biopsy or magnetic resonanceconfirmed diagnosis. Radiologists identified a region of interest (ROI) on each image. We filtered the US images for various texture responses and use the pixel intensity distribution within each ROI as feature parameterizations. Our craniosynostosis dataset consisted of 22 CT-confirmed cases and 22 age-matched controls. One physician manually measured the vectors from the center of the skull to the outer cortex at every 10 deg for each image and we used the principal directions as shape features for parameterization. These parameters and the known diagnosis were used to train classifiers. Testing with cross-validation, we obtained 72.74% accuracy and 0.71 area under receiver operating characteristics curve for steatosis ([Formula: see text]), 77.27% and 0.77 for adenomyosis ([Formula: see text]), and 88.63% and 0.89 for craniosynostosis ([Formula: see text]). Our framework is able to detect a variety of diseases with high accuracy. We hope to include it as a routinely available support system in the clinic. PMID:26835502

  15. A handheld computer-aided diagnosis system and simulated analysis

    Science.gov (United States)

    Su, Mingjian; Zhang, Xuejun; Liu, Brent; Su, Kening; Louie, Ryan

    2016-03-01

    This paper describes a Computer Aided Diagnosis (CAD) system based on cellphone and distributed cluster. One of the bottlenecks in building a CAD system for clinical practice is the storage and process of mass pathology samples freely among different devices, and normal pattern matching algorithm on large scale image set is very time consuming. Distributed computation on cluster has demonstrated the ability to relieve this bottleneck. We develop a system enabling the user to compare the mass image to a dataset with feature table by sending datasets to Generic Data Handler Module in Hadoop, where the pattern recognition is undertaken for the detection of skin diseases. A single and combination retrieval algorithm to data pipeline base on Map Reduce framework is used in our system in order to make optimal choice between recognition accuracy and system cost. The profile of lesion area is drawn by doctors manually on the screen, and then uploads this pattern to the server. In our evaluation experiment, an accuracy of 75% diagnosis hit rate is obtained by testing 100 patients with skin illness. Our system has the potential help in building a novel medical image dataset by collecting large amounts of gold standard during medical diagnosis. Once the project is online, the participants are free to join and eventually an abundant sample dataset will soon be gathered enough for learning. These results demonstrate our technology is very promising and expected to be used in clinical practice.

  16. Analysis of a clock-aided global navigation satellite system (GNSS)

    International Nuclear Information System (INIS)

    This paper presents a dilution of precision (DOP) analysis of a clock-aided global navigation satellite system (GNSS). Firstly, the analysis shows that a best linear unbiased estimator should be used in the clock-aided GNSS to get the best improvements in accuracy. Secondly, the influence of the clock on vertical DOP (VDOP) and horizontal DOP (HDOP) is analysed by using the clock characteristics as a weighting matrix. The analysis highlights quantitative improvements in the VDOP and HDOP and explains why improvements in the VDOP are superior to those of the HDOP in the clock-aided GNSS. Finally, the paper analyses how incorrectly known a priori clock variances degrade the level of accuracy and offers guidelines for determining a weighting matrix in the cases where the clock characteristics are not clearly known

  17. A hyper elasticity method for interactive virtual design of hearing aids

    DEFF Research Database (Denmark)

    Darkner, Sune; Erleben, Kenny

    We present a computational efficient method for isotropic hyper elasticity based on functional analysis. By selecting a class of shape functions, we arrive at a computational scheme which yields very sparse tensors. This enables fast computations of the hyper elastic energy potential and its...... derivatives. We achieve efficiency and performance through the use of shape functions that are linear in their parameters and through rotation into the eigenspace of the right Cauchy–Green strain tensor. This makes near real time evaluation of hyper elasticity of complex meshes on CPU relatively easy to...... by insertion of hearing aid domes into the ear canal. We validate the method for tetrahedral meshes with linear shape functions with an Ogden material model by comparing simulations to deformations of real material. We illustrate the use of other shape functions and models using uniform cubic B...

  18. Minigenerator - Analysis, Design and Tests

    Directory of Open Access Journals (Sweden)

    Pavel Fiala

    2006-01-01

    Full Text Available The paper presents results of the analysis of the vibrational generator. The paper deals with the design of a vibrational generator that is used as a power supply for independent electric circuits. The vibrational generator can be used in the various areas, e.g. traffic, electronics, special-purpose machines, and robotics. The proposed design employs magnetic damping of the core movement. It was numerically evaluated and it was shown that it was possible to obtain significantly larger output voltage and output power than in experimental settings used previously [1].

  19. Advanced earth observation spacecraft computer-aided design software: Technical, user and programmer guide

    Science.gov (United States)

    Farrell, C. E.; Krauze, L. D.

    1983-01-01

    The IDEAS computer of NASA is a tool for interactive preliminary design and analysis of LSS (Large Space System). Nine analysis modules were either modified or created. These modules include the capabilities of automatic model generation, model mass properties calculation, model area calculation, nonkinematic deployment modeling, rigid-body controls analysis, RF performance prediction, subsystem properties definition, and EOS science sensor selection. For each module, a section is provided that contains technical information, user instructions, and programmer documentation.

  20. Design professional activity analysis in design management

    Directory of Open Access Journals (Sweden)

    Claudia de Souza Libanio

    2013-08-01

    Full Text Available Design use perception, as an essential element for achieving competitive advantage, also suggests the need to manage the design activities in companies. However, a few is discussed about the activity of these design professionals who participate in this process, their roles, functions and competencies, including  their connections to a company and other involved sectors. This article aims to analyze, during the design management processes, the work relations of design professionals connected to organizations both internal and externally, in order to comprehend the structure and intervenient factors on the activity of these professionals, as well as the interactions with their main coworkers. The methodology was exploratory and qualitative, using in-depth interviews with three design professionals. Subsequently, the responses were analyzed allowing the comparison of these obtained data to the theoretical bases researched. Through this case study, it was possible to realize the aspects and the structure of the design professional activity, connected intern and externally to organizations, as well as its relations with the main coworkers.

  1. State Aid for Undergraduates in Postsecondary Education. Postsecondary Education Descriptive Analysis Reports. Statistical Analysis Report.

    Science.gov (United States)

    Lee, John B.; Clery, Suzanne B.

    This report examines differences between undergraduates who attended postsecondary institutions in states that provide different levels of student financial aid. The report uses data from the 1995-96 National Postsecondary Student Aid Study. The study evaluated how students combine aid types and sources, price of attendance, and personal…

  2. COMPUTER AIDED DESIGN OF THE STRIP LAYOUT IN PROGRESSIVE CUTTING DIE

    Directory of Open Access Journals (Sweden)

    Faruk MENDİ

    2000-02-01

    Full Text Available Progressive cutting dies have a very important position on the series manufacture of the sheet metals by the method of no-turnings reproduction system. By using classical methods, the design of the dies and the choosing of the suitable die parts are generally time consuming and money spending for designer. In this study, we development a program based on 1 MB study in QBASIC program which can design strip layout. According to the data base, in addition to strip layout design, force analysis, force capacity of the press dies, gravity force center can be found. By making the design of not standard die parts, you can also choose the standard die parts. With this computer program for die design, you can get much more sensitive, enough flexible and fast results.

  3. Custom-Made Computer-Aided-Design/Computer-Aided-Manufacturing Biphasic Calcium-Phosphate Scaffold for Augmentation of an Atrophic Mandibular Anterior Ridge

    Directory of Open Access Journals (Sweden)

    Francesco Guido Mangano

    2015-01-01

    Full Text Available This report documents the clinical, radiographic, and histologic outcome of a custom-made computer-aided-design/computer-aided-manufactured (CAD/CAM scaffold used for the alveolar ridge augmentation of a severely atrophic anterior mandible. Computed tomographic (CT images of an atrophic anterior mandible were acquired and modified into a 3-dimensional (3D reconstruction model; this was transferred to a CAD program, where a custom-made scaffold was designed. CAM software generated a set of tool-paths for the manufacture of the scaffold on a computer-numerical-control milling machine into the exact shape of the 3D design. A custom-made scaffold was milled from a synthetic micromacroporous biphasic calcium phosphate (BCP block. The scaffold closely matched the shape of the defect: this helped to reduce the time for the surgery and contributed to good healing. One year later, newly formed and well-integrated bone was clinically available, and two implants (AnyRidge, MegaGen, Gyeongbuk, South Korea were placed. The histologic samples retrieved from the implant sites revealed compact mature bone undergoing remodelling, marrow spaces, and newly formed trabecular bone surrounded by residual BCP particles. This study demonstrates that custom-made scaffolds can be fabricated by combining CT scans and CAD/CAM techniques. Further studies on a larger sample of patients are needed to confirm these results.

  4. Custom-Made Computer-Aided-Design/Computer-Aided-Manufacturing Biphasic Calcium-Phosphate Scaffold for Augmentation of an Atrophic Mandibular Anterior Ridge.

    Science.gov (United States)

    Mangano, Francesco Guido; Zecca, Piero Antonio; van Noort, Ric; Apresyan, Samvel; Iezzi, Giovanna; Piattelli, Adriano; Macchi, Aldo; Mangano, Carlo

    2015-01-01

    This report documents the clinical, radiographic, and histologic outcome of a custom-made computer-aided-design/computer-aided-manufactured (CAD/CAM) scaffold used for the alveolar ridge augmentation of a severely atrophic anterior mandible. Computed tomographic (CT) images of an atrophic anterior mandible were acquired and modified into a 3-dimensional (3D) reconstruction model; this was transferred to a CAD program, where a custom-made scaffold was designed. CAM software generated a set of tool-paths for the manufacture of the scaffold on a computer-numerical-control milling machine into the exact shape of the 3D design. A custom-made scaffold was milled from a synthetic micromacroporous biphasic calcium phosphate (BCP) block. The scaffold closely matched the shape of the defect: this helped to reduce the time for the surgery and contributed to good healing. One year later, newly formed and well-integrated bone was clinically available, and two implants (AnyRidge, MegaGen, Gyeongbuk, South Korea) were placed. The histologic samples retrieved from the implant sites revealed compact mature bone undergoing remodelling, marrow spaces, and newly formed trabecular bone surrounded by residual BCP particles. This study demonstrates that custom-made scaffolds can be fabricated by combining CT scans and CAD/CAM techniques. Further studies on a larger sample of patients are needed to confirm these results. PMID:26064701

  5. Requirements analysis and system design

    CERN Document Server

    Maciaszek, Leszek A

    2007-01-01

    An examination of the methods and techniques used in the analysis and design phases of Information System development. Emphasis is placed upon the application of object technology in enterprise information systems (EIS) with UML being used throughout. Through its excellent balance of practical explanation and theoretical insight the book manages to avoid unnecessary, complicating details without sacrificing rigor. Examples of real-world scenarios are used throughout, giving the reader an understanding of what really goes on within the field of Software Engineering.

  6. Software Design for Smile Analysis

    Science.gov (United States)

    Sodagar, A.; Rafatjoo, R.; Gholami Borujeni, D.; Noroozi, H.; Sarkhosh, A.

    2010-01-01

    Introduction: Esthetics and attractiveness of the smile is one of the major demands in contemporary orthodontic treatment. In order to improve a smile design, it is necessary to record “posed smile” as an intentional, non-pressure, static, natural and reproducible smile. The record then should be analyzed to determine its characteristics. In this study, we intended to design and introduce a software to analyze the smile rapidly and precisely in order to produce an attractive smile for the patients. Materials and Methods: For this purpose, a practical study was performed to design multimedia software “Smile Analysis” which can receive patients’ photographs and videographs. After giving records to the software, the operator should mark the points and lines which are displayed on the system’s guide and also define the correct scale for each image. Thirty-three variables are measured by the software and displayed on the report page. Reliability of measurements in both image and video was significantly high (α=0.7–1). Results: In order to evaluate intra- operator and inter-operator reliability, five cases were selected randomly. Statistical analysis showed that calculations performed in smile analysis software were both valid and highly reliable (for both video and photo). Conclusion: The results obtained from smile analysis could be used in diagnosis, treatment planning and evaluation of the treatment progress. PMID:21998792

  7. Software Design for Smile Analysis

    Directory of Open Access Journals (Sweden)

    A. Sarkhosh

    2010-12-01

    Full Text Available Introduction: Esthetics and attractiveness of the smile is one of the major demands in contemporary orthodontic treatment. In order to improve a smile design, it is necessary to record “posed smile” as an intentional, non-pressure, static, natural and reproduciblesmile. The record then should be analyzed to determine its characteristics. In this study,we intended to design and introduce a software to analyze the smile rapidly and precisely in order to produce an attractive smile for the patients.Materials and Methods: For this purpose, a practical study was performed to design multimedia software “Smile Analysis” which can receive patients’ photographs and videographs. After giving records to the software, the operator should mark the points and lines which are displayed on the system’s guide and also define the correct scale for each image. Thirty-three variables are measured by the software and displayed on the report page. Reliability of measurements in both image and video was significantly high(=0.7-1.Results: In order to evaluate intra- operator and inter-operator reliability, five cases were selected randomly. Statistical analysis showed that calculations performed in smile analysis software were both valid and highly reliable (for both video and photo.Conclusion: The results obtained from smile analysis could be used in diagnosis,treatment planning and evaluation of the treatment progress.

  8. Mathematical Model and Architecture Design for Computer Aided Modeling of Heterogeneous Objects

    Directory of Open Access Journals (Sweden)

    Rajni Bala

    2013-06-01

    Full Text Available Heterogeneous objects (HO especially functionallygraded materials (FGM inspire a lot of applications in thecurrent arena. Rapid prototyping (RP techniques have thecapabilities to fabricate such objects with designed functionalrequirements but require improved computer aided model. Theconventional modeling approaches only provide geometric andtopologic information of the modelled object but do not containany information regarding varying material composition in theobject domain, thus, can not be used for the fabrication ofheterogeneous objects (HO through rapid prototyping. A novelmodeling approach based on voxelization technique is developedwhich ensures geometric as well as material modeling for rapidprototyping of HO. A mathematical model based on volumetricdataset is developed to represent the material variations alongwith geometric datasets. The model helps in flexiblemanipulability of material variation and also guarantees thegeometric accuracy of fabricated heterogeneous object. Thefunctional relations between basic requirements along with theirrespective solutions for the developed modeling approach areestablished. Different modules for rapid manufacturing ofheterogeneous objects i.e. geometric modeling, material modeling,slicing, visualization and displaying are defined and computerarchitecture is designed for integrating these modules. Fewexamples are demonstrated to show the validation of designedarchitecture.

  9. Computer-aided design of dry powder inhalers using computational fluid dynamics to assess performance.

    Science.gov (United States)

    Suwandecha, Tan; Wongpoowarak, Wibul; Srichana, Teerapol

    2016-01-01

    Dry powder inhalers (DPIs) are gaining popularity for the delivery of drugs. A cost effective and efficient delivery device is necessary. Developing new DPIs by modifying an existing device may be the simplest way to improve the performance of the devices. The aim of this research was to produce a new DPIs using computational fluid dynamics (CFD). The new DPIs took advantages of the Cyclohaler® and the Rotahaler®. We chose a combination of the capsule chamber of the Cyclohaler® and the mouthpiece and grid of the Rotahaler®. Computer-aided design models of the devices were created and evaluated using CFD. Prototype models were created and tested with the DPI dispersion experiments. The proposed model 3 device had a high turbulence with a good degree of deagglomeration in the CFD and the experiment data. The %fine particle fraction (FPF) was around 50% at 60 L/min. The mass median aerodynamic diameter was around 2.8-4 μm. The FPF were strongly correlated to the CFD-predicted turbulence and the mechanical impaction parameters. The drug retention in the capsule was only 5-7%. In summary, a simple modification of the Cyclohaler® and Rotahaler® could produce a better performing inhaler using the CFD-assisted design. PMID:25265389

  10. Computer-aided modelling and analysis of PV systems: a comparative study.

    Science.gov (United States)

    Koukouvaos, Charalambos; Kandris, Dionisis; Samarakou, Maria

    2014-01-01

    Modern scientific advances have enabled remarkable efficacy for photovoltaic systems with regard to the exploitation of solar energy, boosting them into having a rapidly growing position among the systems developed for the production of renewable energy. However, in many cases the design, analysis, and control of photovoltaic systems are tasks which are quite complex and thus difficult to be carried out. In order to cope with this kind of problems, appropriate software tools have been developed either as standalone products or parts of general purpose software platforms used to model and simulate the generation, transmission, and distribution of solar energy. The utilization of this kind of software tools may be extremely helpful to the successful performance evaluation of energy systems with maximum accuracy and minimum cost in time and effort. The work presented in this paper aims on a first level at the performance analysis of various configurations of photovoltaic systems through computer-aided modelling. On a second level, it provides a comparative evaluation of the credibility of two of the most advanced graphical programming environments, namely, Simulink and LabVIEW, with regard to their application in photovoltaic systems. PMID:24772007

  11. Computer-aided de novo ligand design and docking/molecular dynamics study of vitamin D receptor agonists.

    Science.gov (United States)

    Shen, Xiu-Long; Takimoto-Kamimura, Midori; Wei, Jing; Gao, Qing-Zhi

    2012-01-01

    1α,25(OH)(2)D(3), which is directly mediated by the vitamin D receptor (VDR), exerts a wide variety of biological actions. However, the treatment with 1α,25(OH)(2)D(3) is limited because of its side effects. Many analogs and several nonsteroidal mimics with potent biological activity have been reported so far, and our rationale for designing the VDR agonists was on the basis of computer-aided drug design method by de novo design of A-ring and C/D-ring position of 1α,25(OH)(2)D(3). Pyrimidine-2,4-diamine was selected as A-ring, and naphthalene and benzene were chosen as C/D-ring. By linking different components, a virtue compound library was obtained. To evaluate the contribution to activity of each component, we performed a series of automated molecular docking operations. Results revealed that the 19-dimethyl derivatives (the C-19 position correspond to C-20 in 1α,25(OH)(2)D(3)) show the favorable docking affinity to VDR. Moreover, the docking results are quite robust when further validated by molecular dynamics simulations. In addition, by free energy analysis using molecular mechanics-Poisson-Boltzmann surface area (MM-PBSA) method, the driving force of the binding between VDR and the ligands is proved to be hydrophobic interactions. Thus, a possible strategy to design new series of VDR agonists is proposed. The strategy can be successfully applied to explain the high potential activities of the 19-dimethyl derivatives. It is anticipated that the findings reported here may provide useful information for designing effective VDR agonists as well as the therapeutic treatment of VDR-related diseases. PMID:21523537

  12. Art,Science and Technology——Computed Aided Design in Practice & How computer technology affect designer’s work

    Institute of Scientific and Technical Information of China (English)

    赵耀

    2010-01-01

    Introduction:Computing technology has developed significantly in the past few decades.It affects almost everyone in the modern society,creating new ways of communication which affects both our work and leisure activities.Particularly,in today’s world of design and technology,computer aided design is fast becoming a technologically and economically feasible reality.Most designers have accepted the fact that computer aided design plays an important role in the success of their practices,not due to it’s value as an efficient drafting and modeling tool,but also because of clients’perception that it makes sound financial sense to utilize CAD.On the other hand,many people argue that computers are not fully autonomous,they are merely unconscious digital slaves or tools of production.In addition,the abusive use of software technology would turn creative art design into a purely industrial activity.

  13. Statistical Performance Analysis and Modeling Techniques for Nanometer VLSI Designs

    CERN Document Server

    Shen, Ruijing; Yu, Hao

    2012-01-01

    Since process variation and chip performance uncertainties have become more pronounced as technologies scale down into the nanometer regime, accurate and efficient modeling or characterization of variations from the device to the architecture level have  become imperative for the successful design of VLSI chips. This book provides readers with tools for variation-aware design methodologies and computer-aided design (CAD) of VLSI systems, in the presence of process variations at the nanometer scale. It presents the latest developments for modeling and analysis, with a focus on statistical interconnect modeling, statistical parasitic extractions, statistical full-chip leakage and dynamic power analysis considering spatial correlations, statistical analysis and modeling for large global interconnects and analog/mixed-signal circuits.  Provides readers with timely, systematic and comprehensive treatments of statistical modeling and analysis of VLSI systems with a focus on interconnects, on-chip power grids and ...

  14. A method of computer aided design with self-generative models in NX Siemens environment

    Science.gov (United States)

    Grabowik, C.; Kalinowski, K.; Kempa, W.; Paprocka, I.

    2015-11-01

    Currently in CAD/CAE/CAM systems it is possible to create 3D design virtual models which are able to capture certain amount of knowledge. These models are especially useful in an automation of routine design tasks. These models are known as self-generative or auto generative and they can behave in an intelligent way. The main difference between the auto generative and fully parametric models consists in the auto generative models ability to self-organizing. In this case design model self-organizing means that aside from the possibility of making of automatic changes of model quantitative features these models possess knowledge how these changes should be made. Moreover they are able to change quality features according to specific knowledge. In spite of undoubted good points of self-generative models they are not so often used in design constructional process which is mainly caused by usually great complexity of these models. This complexity makes the process of self-generative time and labour consuming. It also needs a quite great investment outlays. The creation process of self-generative model consists of the three stages it is knowledge and information acquisition, model type selection and model implementation. In this paper methods of the computer aided design with self-generative models in NX Siemens CAD/CAE/CAM software are presented. There are the five methods of self-generative models preparation in NX with: parametric relations model, part families, GRIP language application, knowledge fusion and OPEN API mechanism. In the paper examples of each type of the self-generative model are presented. These methods make the constructional design process much faster. It is suggested to prepare this kind of self-generative models when there is a need of design variants creation. The conducted research on assessing the usefulness of elaborated models showed that they are highly recommended in case of routine tasks automation. But it is still difficult to distinguish

  15. Computer-aided-engineering system for modeling and analysis of ECLSS integration testing

    Science.gov (United States)

    Sepahban, Sonbol

    1987-01-01

    The accurate modeling and analysis of two-phase fluid networks found in environmental control and life support systems is presently undertaken by computer-aided engineering (CAE) techniques whose generalized fluid dynamics package can solve arbitrary flow networks. The CAE system for integrated test bed modeling and analysis will also furnish interfaces and subsystem/test-article mathematical models. Three-dimensional diagrams of the test bed are generated by the system after performing the requisite simulation and analysis.

  16. Designing Abstractions for JavaScript Program Analysis

    DEFF Research Database (Denmark)

    Andreasen, Esben Sparre

    2016-01-01

    -of-the-art dataflow analyses, and indicate that good, automated tools for highly dynamic JavaScript programs are attainable. To aid the design of abstractions for both dataflow analyses and type systems, we have developed several methodologies. The methodologies aid the analysis designer in identifying the aspects of......JavaScript is a widely used dynamic programming language. What started out as a client-side scripting language for browsers, is now used for large applications in many different settings. As for other dynamic languages, JavaScript makes it easy to write programs quickly without being constrained by...... the language, and programmers exploit that power to write highly dynamic programs. Automated tools for helping programmers and optimizing programs are used successfully for many programming languages. Unfortunately, the automated tools for JavaScript are not as good as for other programming languages...

  17. Awareness Level of Married Couples on HIV/AIDS in Northeast India – An Empirical Analysis

    Directory of Open Access Journals (Sweden)

    ibyojyoti Bhattacharjee

    2010-08-01

    , has more chance of having complete knowledge about the disease which is however not the case with women. This is true for both rural and urban women of the region. Conclusion: The finding that for women the difference between the percentage of people with complete knowledge about HIV/AIDS amongst those with education and those without education (both rural and urban female population, is negligible- needs proper attention. It means that even education of women of the North East India does not play a significant role to do away with the misconception that they have about HIV/AIDS. Thus, special program are to be designed to enhance the awareness of women about HIV/AIDS.

  18. Basic studies on computer aided concurrent engineering for hull structure design and piping design; Kakugi ittai wo koryoshita doji heikotekina sekkei no shien ni kansuru kisoteki kenkyu

    Energy Technology Data Exchange (ETDEWEB)

    Aoyama, K.; Sawada, K. [The University of Tokyo, Tokyo (Japan)

    1996-12-31

    Considering integrated hull and piping design in shipbuilding industry as a good example for concurrent engineering (CE), discussions were given on a computer aided method to perform integrated hull and piping design smoothly. When CE aiding by means of a computer is considered, it is important to discuss a method for information management not only for `utilization of product models`, but also for `maintaining consistency between items of product information` and `concurrent utilization and production of product information` in concurrent designs. For the CE aided information management, utilization and production of the product information is effective if restrictive relationship between items of product information, and design functions are made clear. Definitions were given on the restrictive relationship between items of product information and `restrictive relationship information` that has `decision/provisional decision`, `date and time`, `designer` and `design functions`. Furthermore, `comprehensive relationship between items of product information` that can be produced from the restrictive relationship information was defined as a `restrictive network`. Utilizing the restrictive relationship between items of product information for CE aiding is effective. 9 refs., 14 figs.

  19. Designing of a digital behind-the-ear hearing aid to meet the World Health Organization requirements.

    Science.gov (United States)

    Bento, Ricardo Ferreira; Penteado, Silvio Pires

    2010-06-01

    Hearing loss is a common health issue that affects nearly 10% of the world population as indicated by many international studies. The hearing impaired typically experience more frustration, anxiety, irritability, depression, and disorientation than those with normal hearing levels. The standard rehabilitation tool for hearing impairment is an electronic hearing aid whose main components are transducers (microphone and receiver) and a digital signal processor. These electronic components are manufactured by supply chain rather than by hearing aid manufacturers. Manufacturers can use custom-designed components or generic off-the-shelf components. These electronic components are available as application-specific or off-the-shelf products, with the former designed for a specific manufacturer and the latter for a generic approach. The choice of custom or generic components will affect the product specifications, pricing, manufacturing, life cycle, and marketing strategies of the product. The World Health Organization is interested in making available to developing countries hearing aids that are inexpensive to purchase and maintain. The hearing aid presented in this article was developed with these specifications in mind together with additional contemporary features such as four channels with wide dynamic range compression, an adjustable compression rate for each channel, four comfort programs, an adaptive feedback manager, and full volume control. This digital hearing aid is fitted using a personal computer with minimal hardware requirements in intuitive three-step fitting software. A trimmer-adjusted version can be developed where human and material resources are scarce. PMID:20724354

  20. Implementation of a tolerance model in a computer aided design and inspection system

    Directory of Open Access Journals (Sweden)

    R. Hunter

    2006-04-01

    Full Text Available Purpose: Purpose of this paper is present a detailed framework to integrate the Computer Aided Design (CAD and Inspection (CAI systems through the integration of the Geometric Dimensioning and Tolerancing (GD&T with the inspection process in coordinate measuring machines (CMMs.Design/methodology/approach: The approach used to develop a prototype of a Knowledge Based System (KBS applied to inspection process establishes a new methodology for integrate the geometric dimensioning and tolerancing (GD&T. The integration is achieved through the definition of the knowledge units for functional properties of GD&T, inspection resources and inspection operations in a common knowledge model. The manufacturing and processing applications are the main topics approach of this paper.Findings: The findings are focused in modeling the features and interactions between knowledge units associated to topology, geometry and tolerances with the inspection process activities. The implementation of the product knowledge model is presented in a computer platform that extracts and represents the GD&T information in a CAI system.Research limitations/implications: The implications are focused on the automation of the inspection process in a KBS application. The future research is focused on the use of artificial intelligent technique, such as genetic algorithms and neural networks, to optimize the time to execute the inspection process.Practical implications: The main outcomes and implication of the KBS prototype application are focused on the reduction of the time spend to develop the inspection process. This KBS application provides the needed information to elaborate this process without the human interface.Originality/value: The original value of this paper is the integration of the design and inspection specification in a unique prototype application. The knowledge model has been defined in a common modeling language (UML and can be implemented in different

  1. Use of crop simulation modelling to aid ideotype design of future cereal cultivars.

    Science.gov (United States)

    Rötter, R P; Tao, F; Höhn, J G; Palosuo, T

    2015-06-01

    A major challenge of the 21st century is to achieve food supply security under a changing climate and roughly a doubling in food demand by 2050 compared to present, the majority of which needs to be met by the cereals wheat, rice, maize, and barley. Future harvests are expected to be especially threatened through increased frequency and severity of extreme events, such as heat waves and drought, that pose particular challenges to plant breeders and crop scientists. Process-based crop models developed for simulating interactions between genotype, environment, and management are widely applied to assess impacts of environmental change on crop yield potentials, phenology, water use, etc. During the last decades, crop simulation has become important for supporting plant breeding, in particular in designing ideotypes, i.e. 'model plants', for different crops and cultivation environments. In this review we (i) examine the main limitations of crop simulation modelling for supporting ideotype breeding, (ii) describe developments in cultivar traits in response to climate variations, and (iii) present examples of how crop simulation has supported evaluation and design of cereal cultivars for future conditions. An early success story for rice demonstrates the potential of crop simulation modelling for ideotype breeding. Combining conventional crop simulation with new breeding methods and genetic modelling holds promise to accelerate delivery of future cereal cultivars for different environments. Robustness of model-aided ideotype design can further be enhanced through continued improvements of simulation models to better capture effects of extremes and the use of multi-model ensembles. PMID:25795739

  2. Revision of Electro-Mechanical Drafting Program to Include CAD/D (Computer-Aided Drafting/Design). Final Report.

    Science.gov (United States)

    Snyder, Nancy V.

    North Seattle Community College decided to integrate computer-aided design/drafting (CAD/D) into its Electro-Mechanical Drafting Program. This choice necessitated a redefinition of the program through new curriculum and course development. To initiate the project, a new industrial advisory council was formed. Major electronic and recruiting firms…

  3. Computer aided drug designing of imidazole free acyl piperazine derivative as a histamine H/sub 3/ receptor antagonist

    International Nuclear Information System (INIS)

    Computer aided drug designing of 1- alkyl-4-acyl piperazine derivative was performed by Argus Lab software. The minimum potential energy is calculated by geometry convergence function by Argus lab software. The most feasible position for the drug to interact with the receptor was found to be 51.19358580 kcal/mol. (author)

  4. 77 FR 17479 - Star Pipe Products, Ltd.; Analysis of Proposed Consent Order To Aid Public Comment

    Science.gov (United States)

    2012-03-26

    ... Star Pipe Products, Ltd.; Analysis of Proposed Consent Order To Aid Public Comment AGENCY: Federal... SUPPLEMENTARY INFORMATION section below. Write ``Star Pipe, Docket No. 9351'' on your comment, and file your... receive it on or before April 20, 2012. Write ``Star Pipe, Docket No. 9351'' on your comment. Your...

  5. 76 FR 15311 - Legacy Learning Systems, Inc.; Analysis of Proposed Consent Order To Aid Public Comment

    Science.gov (United States)

    2011-03-21

    ... Legacy Learning Systems, Inc.; Analysis of Proposed Consent Order To Aid Public Comment AGENCY: Federal... draft complaint and the terms of the consent order--embodied in the consent agreement--that would settle... an individual's Social Security Number; date of birth; driver's license number or other...

  6. 75 FR 79377 - NBTY, Inc.; Analysis of Proposed Consent Order To Aid Public Comment

    Science.gov (United States)

    2010-12-20

    ... NBTY, Inc.; Analysis of Proposed Consent Order To Aid Public Comment AGENCY: Federal Trade Commission... the terms of the consent order--embodied in the consent agreement--that would settle these allegations... Security Number; date of birth; driver's license number or other State identification number, or...

  7. 48 CFR 915.404-2-70 - Audit as an aid in proposal analysis.

    Science.gov (United States)

    2010-10-01

    ... ENERGY CONTRACTING METHODS AND CONTRACT TYPES CONTRACTING BY NEGOTIATION Contract Pricing 915.404-2-70 Audit as an aid in proposal analysis. (a) When a contract price will be based on cost or pricing data... (2) $1,000,000 for all other contract types, including initial prices, estimated costs of...

  8. 76 FR 75883 - Facebook, Inc.; Analysis of Proposed Consent Order To Aid Public Comment

    Science.gov (United States)

    2011-12-05

    ... Facebook, Inc.; Analysis of Proposed Consent Order To Aid Public Comment AGENCY: Federal Trade Commission... SUPPLEMENTARY INFORMATION section below. Write ``Facebook, File No. 092 3184'' on your comment, and file your... receive it on or before December 30, 2011. Write ``Facebook, File No. 092 3184'' on your comment....

  9. 77 FR 1491 - Sigma Corporation; Analysis of Proposed Consent Order To Aid Public Comment

    Science.gov (United States)

    2012-01-10

    ... Sigma Corporation; Analysis of Proposed Consent Order To Aid Public Comment AGENCY: Federal Trade... SUPPLEMENTARY INFORMATION section below. Write ``Sigma, File No. 101 0080'' on your comment, and file your... receive it on or before February 6, 2012. Write ``Sigma, File No. 101 0080'' on your comment. Your...

  10. Graphical and Normative Analysis of Binocular Vision by Mini Computer: A Teaching Aid and Clinical Tool.

    Science.gov (United States)

    Kees, Martin; Schor, Clifton

    1981-01-01

    An inexpensive computer graphics systems (Commodore PET), used as a video aid for teaching students advanced case analysis, is described. The course provides students with the analytical tools for evaluating with graphical and statistical techniques and treating with lenses, prisms, and orthoptics various anomalies of binocular vision. (MLW)

  11. 77 FR 50508 - Brain-Pad, Inc; Analysis of Proposed Consent Order To Aid Public Comment

    Science.gov (United States)

    2012-08-21

    ... Brain-Pad, Inc; Analysis of Proposed Consent Order To Aid Public Comment AGENCY: Federal Trade... SUPPLEMENTARY INFORMATION section below. Write ``Brain-Pad, File No. 122 3073'' on your comment, and file your... must receive it on or before September 17, 2012. Write ``Brain-Pad, File No. 122 3073'' on your...

  12. 77 FR 16225 - Ramey Motors, Inc.; Analysis of Proposed Consent Order to Aid Public Comment

    Science.gov (United States)

    2012-03-20

    ..., patterns, devices, manufacturing processes, or customer names. If you want the Commission to give your... comment to the Commission by courier or overnight service. Visit the Commission Web site at http://www.ftc... Ramey Motors, Inc.; Analysis of Proposed Consent Order to Aid Public Comment AGENCY: Federal...

  13. 77 FR 16224 - Billion Auto, Inc.; Analysis of Proposed Consent Order To Aid Public Comment

    Science.gov (United States)

    2012-03-20

    ..., patterns, devices, manufacturing processes, or customer names. If you want the Commission to give your... comment to the Commission by courier or overnight service. Visit the Commission Web site at http://www.ftc... Billion Auto, Inc.; Analysis of Proposed Consent Order To Aid Public Comment AGENCY: Federal...

  14. 76 FR 57043 - Andrew N. Finkel; Analysis of Proposed Consent Order to Aid Public Comment

    Science.gov (United States)

    2011-09-15

    ..., or customer names. If you want the Commission to give your comment confidential treatment, you must... service. Visit the Commission Web site at http://www.ftc.gov to read this Notice and the news release... Andrew N. Finkel; Analysis of Proposed Consent Order to Aid Public Comment AGENCY: Federal...

  15. SMART USE OF COMPUTER-AIDED SPERM ANALYSIS (CASA) TO CHARACTERIZE SPERM MOTION

    Science.gov (United States)

    Computer-aided sperm analysis (CASA) has evolved over the past fifteen years to provide an objective, practical means of measuring and characterizing the velocity and parttern of sperm motion. CASA instruments use video frame-grabber boards to capture multiple images of spermato...

  16. 76 FR 18762 - Google, Inc.; Analysis of Proposed Consent Order To Aid Public Comment

    Science.gov (United States)

    2011-04-05

    ... Google, Inc.; Analysis of Proposed Consent Order To Aid Public Comment AGENCY: Federal Trade Commission... submit written comments electronically or in paper form. Comments should refer to ``Google, File No. 102... release describing it. A comment filed in paper form should include the ``Google, File No. 102...

  17. 77 FR 64519 - Magnesium Elektron; Analysis of Agreement Containing Consent Orders To Aid Public Comment

    Science.gov (United States)

    2012-10-22

    ... Magnesium Elektron; Analysis of Agreement Containing Consent Orders To Aid Public Comment AGENCY: Federal... INFORMATION section below. Write ``Magnesium Elektron, File No. 091 0094'' on your comment and file your... November 13, 2012. Write ``Magnesium Elektron, File No. 091 0094'' on your comment. Your comment...

  18. Design aid for shear strengthening of reinforced concrete T-joints using carbon fiber reinforced plastic composites

    Science.gov (United States)

    Gergely, Ioan

    The research presented in the present work focuses on the shear strengthening of beam column joints using carbon fiber composites, a material considered in seismic retrofit in recent years more than any other new material. These composites, or fiber reinforced polymers, offer huge advantages over structural steel reinforced concrete or timber. A few of these advantages are the superior resistance to corrosion, high stiffness to weight and strength to weight ratios, and the ability to control the material's behavior by selecting the orientation of the fibers. The design and field application research on reinforced concrete cap beam-column joints includes analytical investigations using pushover analysis; design of carbon fiber layout, experimental tests and field applications. Several beam column joints have been tested recently with design variables as the type of composite system, fiber orientation and the width of carbon fiber sheets. The surface preparation has been found to be critical for the bond between concrete and composite material, which is the most important factor in joint shear strengthening. The final goal of this thesis is to develop design aids for retrofitting reinforced concrete beam column joints. Two bridge bents were tested on the Interstate-15 corridor. One bent was tested in the as-is condition. Carbon fiber reinforced plastic composite sheets were used to externally reinforce the second bridge bent. By applying the composite, the displacement ductility has been doubled, and the bent overall lateral load capacity has been increased as well. The finite element model (using DRAIN-2DX) was calibrated to model the actual stiffness of the supports. The results were similar to the experimental findings.

  19. Prosthetic rehabilitation with an implant-supported fixed prosthesis using computer-aided design and computer-aided manufacturing dental technology for a patient with a mandibulectomy: A clinical report.

    Science.gov (United States)

    Yoon, Hyung-In; Han, Jung-Suk

    2016-02-01

    The fabrication of dental prostheses with computer-aided design and computer-aided manufacturing shows acceptable marginal fits and favorable treatment outcomes. This clinical report describes the management of a patient who had undergone a mandibulectomy and received an implant-supported fixed prosthesis by using additive manufacturing for the framework and subtractive manufacturing for the monolithic zirconia restorations. PMID:26518985

  20. AESOP: A computer-aided design program for linear multivariable control systems

    Science.gov (United States)

    Lehtinen, B.; Geyser, L. C.

    1982-01-01

    An interactive computer program (AESOP) which solves quadratic optimal control and is discussed. The program can also be used to perform system analysis calculations such as transient and frequency responses, controllability, observability, etc., in support of the control and filter design computations.

  1. A survey and evaluation of microbased computer aided design systems for design education and practice in Scotland primarily in the area of product design: their application, problems and potential solutions

    OpenAIRE

    Carter, Roderick P.

    1992-01-01

    The initial premise of the research centred around the relatively new adoption by the Product Design sector of Computer Aided Design technology. Problems Were expected to occur in applying the hardware and understanding the terminology of the software by this sector which prides itself In its artisan skills. The aim of the work was to determine the extent of the adoption of Computer Aided Design and to clarify the problem areas. The research determined, by study of more experienced but sim...

  2. Indications for Computer-Aided Design and Manufacturing in Congenital Craniofacial Reconstruction.

    Science.gov (United States)

    Fisher, Mark; Medina, Miguel; Bojovic, Branko; Ahn, Edward; Dorafshar, Amir H

    2016-09-01

    The complex three-dimensional relationships in congenital craniofacial reconstruction uniquely lend themselves to the ability to accurately plan and model the result provided by computer-aided design and manufacturing (CAD/CAM). The goal of this study was to illustrate indications where CAD/CAM would be helpful in the treatment of congenital craniofacial anomalies reconstruction and to discuss the application of this technology and its outcomes. A retrospective review was performed of all congenital craniofacial cases performed by the senior author between 2010 and 2014. Cases where CAD/CAM was used were identified, and illustrative cases to demonstrate the benefits of CAD/CAM were selected. Preoperative appearance, computerized plan, intraoperative course, and final outcome were analyzed. Preoperative planning enabled efficient execution of the operative plan with predictable results. Risk factors which made these patients good candidates for CAD/CAM were identified and compiled. Several indications, including multisuture and revisional craniosynostosis, facial bipartition, four-wall box osteotomy, reduction cranioplasty, and distraction osteogenesis could benefit most from this technology. We illustrate the use of CAD/CAM for these applications and describe the decision-making process both before and during surgery. We explore why we believe that CAD/CAM is indicated in these scenarios as well as the disadvantages and risks. PMID:27516839

  3. Can robust statistics aid in the analysis of NAA results?

    International Nuclear Information System (INIS)

    In this work, which is part of a larger effort to develop a software to automate instrumental neutron activation analysis calculations, the elemental concentration in a sample was calculated using either a set containing only the gamma-ray peaks recommended in the literature or a set containing all peaks identified. The results for each element were reduced using five tools: the usual unweighted and weighted means, plus the limitation of statistical weight, Normalized Residuals and Rajeval. The results were compared to the certified value for each element, allowing for discussion on the performance of each statistical tool and on the choices of peaks. (author)

  4. Computer-aided fiber analysis for crime scene forensics

    Science.gov (United States)

    Hildebrandt, Mario; Arndt, Christian; Makrushin, Andrey; Dittmann, Jana

    2012-03-01

    The forensic analysis of fibers is currently completely manual and therefore time consuming. The automation of analysis steps can significantly support forensic experts and reduce the time, required for the investigation. Moreover, a subjective expert belief is extended by objective machine estimation. This work proposes the pattern recognition pipeline containing the digital acquisition of a fiber media, the pre-processing for fiber segmentation, and the extraction of the distinctive characteristics of fibers. Currently, basic geometrical features like width, height, area of optically dominant fibers are investigated. In order to support the automatic classification of fibers, supervised machine learning algorithms are evaluated. The experimental setup includes a car seat and two pieces clothing of a different fabric. As preliminary work, acrylic as synthetic and sheep wool as natural fiber are chosen to be classified. While sitting on the seat, a test person leaves textile fibers. The test aims at automatic distinguishing of clothes through the fiber traces gained from the seat with the help of adhesive tape. The digitalization of fiber samples is provided by a contactless chromatic white light sensor. First test results showed, that two optically very different fibers can be properly assigned to their corresponding fiber type. The best classifier achieves an accuracy of 75 percent correctly classified samples for our suggested features.

  5. Computational fluid dynamics-aided analysis of a hydride vapor phase epitaxy reactor

    Science.gov (United States)

    Schulte, Kevin L.; Simon, John; Roy, Abhra; Reedy, Robert C.; Young, David L.; Kuech, Thomas F.; Ptak, Aaron J.

    2016-01-01

    We report the development of a computational fluid dynamics (CFD) model of a dual chamber hydride vapor phase epitaxial (HVPE) growth reactor. Uniformity of reactant concentrations in the growth stream, transient reactor flows, and cross doping between the two growth chambers, all factors critical to the deposition of uniform, low defect semiconductor layers, were modeled. Simulation results were generated by solving the fundamental continuity, momentum and energy equations over a discretized reactor volume by a finite volume analysis with the aid of CFD-ACE+ commercial software. We demonstrated uniformity of the vapor composition within ±1% across the substrate, achieved due to specific features of the reactor design. Small compositional non-uniformity (±2% absolute) in In1-xGaxP layers grown in our reactor was correlated with calculated temperature non-uniformity across the substrate. Gas switching was modeled and the transient time predicted by the model was confirmed by measurement of doping transients in a sample grown in the reactor. Lastly the gas curtains that chemically isolate the reactor chambers were modeled and the results were compared to experimental data for cross doping between the chambers. As an example, we demonstrate, based on insight from the model, that our HVPE reactor is suitable for the deposition of GaAs PV devices. CFD modeling is a critical tool for the scale up of laboratory level processes to industrial levels.

  6. Strengthening capacity for AIDS vaccine research: analysis of the Pfizer Global Health Fellows Program and the International AIDS Vaccine Initiative

    OpenAIRE

    Vian, Taryn; Koseki, Sayaka; Feeley, Frank G; Beard, Jennifer

    2013-01-01

    Background Industry partnerships can help leverage resources to advance HIV/AIDS vaccine research, service delivery, and policy advocacy goals. This often involves capacity building for international and local non-governmental organizations (NGOs). International volunteering is increasingly being used as a capacity building strategy, yet little is known about how corporate volunteers help to improve performance of NGOs in the fight against HIV/AIDS. Methods This case study helps to extend our...

  7. A non-linear programming approach to the computer-aided design of regulators using a linear-quadratic formulation

    Science.gov (United States)

    Fleming, P.

    1985-01-01

    A design technique is proposed for linear regulators in which a feedback controller of fixed structure is chosen to minimize an integral quadratic objective function subject to the satisfaction of integral quadratic constraint functions. Application of a non-linear programming algorithm to this mathematically tractable formulation results in an efficient and useful computer-aided design tool. Particular attention is paid to computational efficiency and various recommendations are made. Two design examples illustrate the flexibility of the approach and highlight the special insight afforded to the designer.

  8. Computer Aided ECG Analysis - State of the Art and Upcoming Challenges

    OpenAIRE

    Velic, Marko; Padavic, Ivan; Car, Sinisa

    2013-01-01

    In this paper we present current achievements in computer aided ECG analysis and their applicability in real world medical diagnosis process. Most of the current work is covering problems of removing noise, detecting heartbeats and rhythm-based analysis. There are some advancements in particular ECG segments detection and beat classifications but with limited evaluations and without clinical approvals. This paper presents state of the art advancements in those areas till present day. Besides ...

  9. Conservation and aid: designing more effective investments in natural resource governance reform.

    Science.gov (United States)

    Nelson, Fred

    2009-10-01

    Biodiversity conservation outcomes are closely related to the rules and institutions governing resource use. Creating local incentives for conservation through more secure resource tenure is central to conservation outcomes on private and communal lands, where the preponderance of biodiversity occurs. Conservation efforts in sub-Saharan Africa are therefore centrally concerned with governance dynamics and institutional reform processes, such as the decentralization of property rights, and how best to achieve such reforms. Traditional mechanisms for financing conservation efforts in Africa rely heavily on funds channeled through multilateral and bilateral aid agencies. The history of development aid highlights a range of constraints these aid agencies face in terms of working toward more effective resource governance arrangements and promoting reforms. Government aid agencies possess incentives for promoting large-scale and short-term projects that maximize expenditure volumes and tend to define issues in technical rather than political terms. The history of development aid suggests that these and other characteristics of aid agencies impedes their ability to influence governance reform processes and that aid funding may discourage the adoption of reforms. Greater emphasis in African conservation financing needs to be placed on flexible, small-scale investments aligned to local interests and constituencies that prioritize innovation, learning, and experimentation. Additionally, more research is required that explores the linkages between conservation funding, donor decision-making processes, and governance reforms. PMID:19765032

  10. MIPS: a service-based aid for intelligence analysis

    Science.gov (United States)

    Braines, David; Ibbotson, John; White, Graham

    2013-05-01

    The Management of Information Processing Services (MIPS) project has two main objectives; the notification to analysts of the arrival of relevant new information and the automatic processing of the new information. Within these objectives a number of significant challenges were addressed. To achieve the first objective, the team had to demonstrate the capability for specific analysts to be "tipped-off" in real-time that textual reports and sensor-data have been received that are relevant to their analytical tasks, including the possibility that such reports have been made available by other nations. In the case of the second objective, the team had to demonstrate the capability for the infrastructure to automatically initiate processing of input data as it arrives, consistent with satisfying the analytical goals of teams of analysts, in as an efficient a manner as possible (including the case where data is made available by more than one nation). Using the Information Fabric middleware developed as part of the International Technology Alliance (ITA) research program, the team created a service based information processing infrastructure to achieve the objectives and challenges set by the customer. The infrastructure allows existing software to be wrapped as a service and/or specially written services to be integrated with each other as well as with other ITA technologies such as the Controlled English (CE) Store or the Gaian Database. This paper will identify the difficulties in designing and implementing the MIPS infrastructure together with describing its architecture and illustrating its use with a worked example use case.

  11. Design of an Yb-169 source optimized for gold nanoparticle-aided radiation therapy

    Energy Technology Data Exchange (ETDEWEB)

    Reynoso, Francisco J.; Manohar, Nivedh [Nuclear/Radiological Engineering and Medical Physics Programs, Woodruff School of Mechanical Engineering, Georgia Institute of Technology, Atlanta, Georgia 30332-0405 (United States); Krishnan, Sunil [Department of Radiation Oncology, The University of Texas MD Anderson Cancer Center, Houston, Texas 77030 (United States); Cho, Sang Hyun, E-mail: scho@mdanderson.org [Department of Radiation Physics and Department of Imaging Physics, The University of Texas MD Anderson Cancer Center, Houston, Texas 77030 (United States)

    2014-10-15

    Purpose: To find an optimum design of a new high-dose rate ytterbium (Yb)-169 brachytherapy source that would maximize the dose enhancement during gold nanoparticle-aided radiation therapy (GNRT), while meeting practical constraints for manufacturing a clinically relevant brachytherapy source. Methods: Four different Yb-169 source designs were considered in this investigation. The first three source models had a single encapsulation made of one of the following materials: aluminum, titanium, and stainless steel. The last source model adopted a dual encapsulation design with an inner aluminum capsule surrounding the Yb-core and an outer titanium capsule. Monte Carlo (MC) simulations using the Monte Carlo N-Particle code version 5 (MCNP5) were conducted initially to investigate the spectral changes caused by these four source designs and the associated variations in macroscopic dose enhancement across the tumor loaded with gold nanoparticles (GNPs) at 0.7% by weight. Subsequent MC simulations were performed using the EGSnrc and NOREC codes to determine the secondary electron spectra and microscopic dose enhancement as a result of irradiating the GNP-loaded tumor with the MCNP-calculated source spectra. Results: Effects of the source filter design were apparent in the current MC results. The intensity-weighted average energy of the Yb-169 source varied from 108.9 to 122.9 keV, as the source encapsulation material changed from aluminum to stainless steel. Accordingly, the macroscopic dose enhancement calculated at 1 cm away from the source changed from 51.0% to 45.3%. The sources encapsulated by titanium and aluminum/titanium combination showed similar levels of dose enhancement, 49.3% at 1 cm, and average energies of 113.0 and 112.3 keV, respectively. While the secondary electron spectra due to the investigated source designs appeared to look similar in general, some differences were noted especially in the low energy region (<50 keV) of the spectra suggesting the

  12. Design of an Yb-169 source optimized for gold nanoparticle-aided radiation therapy

    International Nuclear Information System (INIS)

    Purpose: To find an optimum design of a new high-dose rate ytterbium (Yb)-169 brachytherapy source that would maximize the dose enhancement during gold nanoparticle-aided radiation therapy (GNRT), while meeting practical constraints for manufacturing a clinically relevant brachytherapy source. Methods: Four different Yb-169 source designs were considered in this investigation. The first three source models had a single encapsulation made of one of the following materials: aluminum, titanium, and stainless steel. The last source model adopted a dual encapsulation design with an inner aluminum capsule surrounding the Yb-core and an outer titanium capsule. Monte Carlo (MC) simulations using the Monte Carlo N-Particle code version 5 (MCNP5) were conducted initially to investigate the spectral changes caused by these four source designs and the associated variations in macroscopic dose enhancement across the tumor loaded with gold nanoparticles (GNPs) at 0.7% by weight. Subsequent MC simulations were performed using the EGSnrc and NOREC codes to determine the secondary electron spectra and microscopic dose enhancement as a result of irradiating the GNP-loaded tumor with the MCNP-calculated source spectra. Results: Effects of the source filter design were apparent in the current MC results. The intensity-weighted average energy of the Yb-169 source varied from 108.9 to 122.9 keV, as the source encapsulation material changed from aluminum to stainless steel. Accordingly, the macroscopic dose enhancement calculated at 1 cm away from the source changed from 51.0% to 45.3%. The sources encapsulated by titanium and aluminum/titanium combination showed similar levels of dose enhancement, 49.3% at 1 cm, and average energies of 113.0 and 112.3 keV, respectively. While the secondary electron spectra due to the investigated source designs appeared to look similar in general, some differences were noted especially in the low energy region (<50 keV) of the spectra suggesting the

  13. Thermal design, analysis, and testing of the CETA Space Shuttle Flight Experiment

    Science.gov (United States)

    Witsil, Amy K.; Foss, Richard A.

    1990-01-01

    Attention is given to the Crew and Equipment Translation Aid (CETA) Space Shuttle flight experiment designed to demonstrate techniques and equipment for propelling and restraining crew during EVA. Emphasis is placed on the thermal analysis of the CETA hardware, including thermal design trade-offs, modeling assumptions, temperature predictions, and testing activities.

  14. An Automated Evaluation and Critiquing Aid for User Interface Design Project

    Data.gov (United States)

    National Aeronautics and Space Administration — We will leverage our prior work on Adaptive Information Management (AIM) to provide a core reasoning capability usable in a diverse set of tools to aid and assist...

  15. Analysis and design of microsoccer robot

    Institute of Scientific and Technical Information of China (English)

    张智超; 赵臣; 丁凤; 吴连熙

    2002-01-01

    From the analysis of mirosot robot soccer, the design of the robot is discussed in detail covering thebasic ideas of design, the general design procedure, main calculations, and the cinematic model of robot, etc.

  16. The Effectiveness of Teaching Aids for Elementary Students' Renewable Energy Learning and an Analysis of Their Energy Attitude Formation

    Science.gov (United States)

    Chou, Ying-Chyi; Yen, Hsin-Yi; Yen, Hong-Wei; Chao, Yu-Long; Huang, Ying-Hsiu

    2015-01-01

    As an examination of the influences of a renewable energy teaching activity employing teaching aids on elementary students' knowledge of, attitude toward, and behavior of energy saving and carbon reduction, this study designed a teaching experiment in which experimental group was subjected to the teaching with four teaching aids for students to…

  17. Hearing aid effectiveness after aural rehabilitation - individual versus group (HEARING) trial: RCT design and baseline characteristics

    OpenAIRE

    Heagerty Patrick J; Liu Chuan-Fen; Souza Pamela E; Collins Margaret P; Amtmann Dagmar; Yueh Bevan

    2009-01-01

    Abstract Background Hearing impairment is the most common body system disability in veterans. In 2008, nearly 520,000 veterans had a disability for hearing loss through the Department of Veterans Affairs (VA). Changes in eligibility for hearing aid services, along with the aging population, contributed to a greater than 300% increase in the number of hearing aids dispensed from 1996 to 2006. In 2006, the VA committed to having no wait times for patient visits while providing quality clinicall...

  18. CFD aided design of the experimental helium loop for VHTR simulation

    International Nuclear Information System (INIS)

    A medium-scale helium loop for simulating a VHTR (Very High Temperature Reactor) is now under construction in KAERI (Korea Atomic Energy Research Institute). Two electric heaters of the test helium loop heat the helium fluid up to 950°C at a pressure of 1 ~ 9MPa. To optimize the design specifications of the experimental helium loop, conjugate heat transfer in the high-temperature helium heater was analyzed by using CFD (Computational Fluid Dynamics) simulation. The main factors tested in this CFD analysis were the effects of turbulence, radiation, gravity, and geometrical configuration of the heater. From the analysis results, the optimum design configuration was selected confirming that thermal characteristics of the heater well meet the design requirements. In this study, the interrelated effects of buoyancy forces and radiation heat transfer on the geometrical configuration were closely investigated. It was concluded that the buoyancy effects on the helium flows of the heater would be suppressed by the radiation heat transfer inside the heating channel. Various emissivity values of the reflector material emissivity were also tested. Gravity had greater effects on the temperature distribution for the lower emissivity, but the maximum temperature variations due to the emissivity changes from 0.1 to 0.9 were limited to within a few tens of degrees. Finally, more detailed analyses on the HTH of the medium scale helium loop including the spacers were performed and it is confirmed that the thermal-fluidic characteristics of the HTH satisfied the design requirements. (author)

  19. CFD aided design of the experimental helium loop for VHTR simulation

    Energy Technology Data Exchange (ETDEWEB)

    Yoon, C.; Hong, S.D.; Noh, J.M.; Kim, Y.W.; Chang, J.H., E-mail: cyoon@kaeri.re.kr, E-mail: sdhong1@kaeri.re.kr, E-mail: jmnoh@kaeri.re.kr, E-mail: ywkim@kaeri.re.kr, E-mail: jhchang@kaeri.re.kr [Korea Atomic Energy Research Inst., Daejeon (Korea, Republic of)

    2011-07-01

    A medium-scale helium loop for simulating a VHTR (Very High Temperature Reactor) is now under construction in KAERI (Korea Atomic Energy Research Institute). Two electric heaters of the test helium loop heat the helium fluid up to 950°C at a pressure of 1 ~ 9MPa. To optimize the design specifications of the experimental helium loop, conjugate heat transfer in the high-temperature helium heater was analyzed by using CFD (Computational Fluid Dynamics) simulation. The main factors tested in this CFD analysis were the effects of turbulence, radiation, gravity, and geometrical configuration of the heater. From the analysis results, the optimum design configuration was selected confirming that thermal characteristics of the heater well meet the design requirements. In this study, the interrelated effects of buoyancy forces and radiation heat transfer on the geometrical configuration were closely investigated. It was concluded that the buoyancy effects on the helium flows of the heater would be suppressed by the radiation heat transfer inside the heating channel. Various emissivity values of the reflector material emissivity were also tested. Gravity had greater effects on the temperature distribution for the lower emissivity, but the maximum temperature variations due to the emissivity changes from 0.1 to 0.9 were limited to within a few tens of degrees. Finally, more detailed analyses on the HTH of the medium scale helium loop including the spacers were performed and it is confirmed that the thermal-fluidic characteristics of the HTH satisfied the design requirements. (author)

  20. Computer-Aided Design Data Extraction Approach to Identify Product Information

    Directory of Open Access Journals (Sweden)

    Mohamad F.A. Jabal

    2009-01-01

    Full Text Available Problem statement: Many approaches have been proposed in previous such as AUTOFEAT algorithm, feature recognition, Intelligent Feature Recognition Methodology (IFRM, a part recognition algorithm and graph theory-based approach in order to solve the integration issue between CAD and CAM. However, there is no direct connection from CAD database and machine database. Therefore, comparison among the approaches has been conducted because to recognize the suitable approach is the importance tasks before this research can be proceed for the next stage. Approach: This study focused on CAD data extraction approach to identify product information. CAD data referred as Computer-Aided Design (CAD data extracted from the CAD drawing which contained the drawing of product that be produce by manufacturing. CAD data consisted of geometric and non-geometric data. Geometric data contained lines, curves and vertex. While non-geometric data include texts, colors and layers. The extracted CAD data were needed to generate the product information which is useful information for the machine in production field to produce the product for the manufacturing same as depicted in the CAD drawing. Basically, the product information consisted of product details such as length, thickness, wideness and radius of the product, processes information for the machine to process the product such as taper, cutting, drilling and punching. In addition, product information also contained type of materials for the product. Results: As a result, feature recognition is the most suitable approach can be applied for this research. Thus, the approach was selected to precede the next stage. Conclusion: Conclusion from the comparison among the approaches is in term of accuracy of extracted data is not accurate when the drawing is incomplete drawing or contains the noise such as unwanted lines or any shapes cross the object in the drawing.

  1. Design and analysis of HYPER

    Energy Technology Data Exchange (ETDEWEB)

    Song, T.Y. [Korea Atomic Energy Research Institute, P.O. Box 105, Yuseong, Daejeon 305-600 (Korea, Republic of)], E-mail: tysong@kaeri.re.kr; Kim, Y.; Lee, B.O.; Cho, C.H. [Korea Atomic Energy Research Institute, P.O. Box 105, Yuseong, Daejeon 305-600 (Korea, Republic of)

    2007-11-15

    KAERI (Korea Atomic Energy Research Institute) has been developing an accelerator driven transmutation system called HYPER (hybrid power extraction reactor). It is designed to transmute long-lived TRU and fission products such as Tc-99 and I-129. HYPER is a 1000 MW{sub th} system with k{sub eff} = 0.98 which requires 17 mA proton beam for an operation at EOC (end of cycle). Pb-Bi is used as the coolant and target material at the same time. HYPER core has 186 ductless hexagonal fuel assemblies. The fuel blanket is divided into three TRU (transuranic elements) enrichment zones to flatten the radial power distribution. The core height of HYPER was compromised at 150 cm, and the power density was determined such that the average coolant speed could be about 1.64 m/s. The inlet and exit coolant temperatures are 340 and 490 {sup o}C, respectively, in the core. The cylindrical beam tube and spherical window is adopted as the basic window design of HYPER. We have also introduced an Lead-Bismuth eutectic injection tube to maximize the allowable proton beam current. A metallic alloy of U-TRU-Zr is considered as the HYPER fuel, in which pure lead is used as the bonding material. As a result, a large gas plenum is placed above the active core. TRU transmutation rate is 282 kg/yr. In the case of a FP transmutation, 28.0 kg of Tc-99 and 7.0 kg of I-129 are incinerated per year. The MACSIS-H (metal fuel performance analysis code for simulating the in-reactor behavior under steady-state conditions-HYPER) for an metallic fuel was developed as the steady-state performance computer code. The MATRA (multichannel analyzer for transient and steady-state in rod array) code was used to perform the thermal-hydraulic analysis of HYPER core.

  2. VPIsystems industry training program on computer-aided design of fiber optic communication systems

    Science.gov (United States)

    Richter, Andre; Chan, David K. C.

    2002-05-01

    In industry today, professional Photonic Design Automation (PDA) tools are a necessity to enable fast development cycles for the design of optical components, systems and networks. The training of industrial personnel is of great importance in facilitating the full usability of PDA tools tailored to meet these demands. As the market leader of design and planning tools for system integrators and manufacturers of optical transmission systems and components, VPIsystems offers a set of two-day training courses. Attendees are taught on the design of metro WDM networks, high speed DWDM and ultra long-haul WDM systems, analogue and digital cable access systems, EDFA and Raman amplifiers, as well as active devices and circuits. The course work compromises of: (1) lectures on physical and modeling background topics; (2) creation of typical simulation scenarios and; (3) the analysis of results. This course work is facilitated by guided, hands-on lab exercises using VPIsystems software for a variety of practical design situations. In classes of up to 15, each attendee is allocated a computer, thereby allowing for a thorough and speedy training for the individual in all of the covered topics as well as for any extra-curriculum topics to be covered. Since 1999, more than 750 people have graduated from over 60 training courses. In this paper, details of VPIsystems Industry training program will be presented.

  3. Computer aided plant engineering: An analysis and suggestions for computer use

    International Nuclear Information System (INIS)

    To get indications to and boundary conditions for computer use in plant engineering, an analysis of the engineering process was done. The structure of plant engineering is represented by a network of substaks and subsets of data which are to be manipulated. Main tool for integration of CAD-subsystems in plant engineering should be a central database which is described by characteristical requirements and a possible simple conceptual schema. The main features of an interactive system for computer aided plant engineering are shortly illustrated by two examples. The analysis leads to the conclusion, that an interactive graphic system for manipulation of net-like structured data, usable for various subtasks, should be the base for computer aided plant engineering. (orig.)

  4. On the convergence of nanotechnology and Big Data analysis for computer-aided diagnosis.

    Science.gov (United States)

    Rodrigues, Jose F; Paulovich, Fernando V; de Oliveira, Maria Cf; de Oliveira, Osvaldo N

    2016-04-01

    An overview is provided of the challenges involved in building computer-aided diagnosis systems capable of precise medical diagnostics based on integration and interpretation of data from different sources and formats. The availability of massive amounts of data and computational methods associated with the Big Data paradigm has brought hope that such systems may soon be available in routine clinical practices, which is not the case today. We focus on visual and machine learning analysis of medical data acquired with varied nanotech-based techniques and on methods for Big Data infrastructure. Because diagnosis is essentially a classification task, we address the machine learning techniques with supervised and unsupervised classification, making a critical assessment of the progress already made in the medical field and the prospects for the near future. We also advocate that successful computer-aided diagnosis requires a merge of methods and concepts from nanotechnology and Big Data analysis. PMID:26979668

  5. The role of computer-aided design in the learning of practical 3D-descriptive geometry: a case study

    OpenAIRE

    Edwards, Geoffrey Alan

    1988-01-01

    There are a number of problems surrounding the teaching of practical 3-D descriptive geometry to children in secondary education, notably the difficulty pupils have with visualising an object's form from orthographic views, and the interpretation of an object's geometric attributes into the descriptive geometry representation. The purpose of the current research is to evaluate the use of computer-aided design in this area of the curriculum and is based upon work under...

  6. Effect of different adhesive strategies on microtensile bond strength of computer aided design/computer aided manufacturing blocks bonded to dentin

    Science.gov (United States)

    Roperto, Renato; Akkus, Anna; Akkus, Ozan; Lang, Lisa; Sousa-Neto, Manoel Damiao; Teich, Sorin; Porto, Thiago Soares

    2016-01-01

    Background: The aim of this study was to determine the microtensile bond strength (μTBS) of ceramic and composite computer aided design-computer aided manufacturing (CAD-CAM) blocks bonded to dentin using different adhesive strategies. Materials and Methods: In this in vitro study, 30 crowns of sound freshly extracted human molars were sectioned horizontally 3 mm above the cementoenamel junction to produce flat dentin surfaces. Ceramic and composite CAD/CAM blocks, size 14, were sectioned into slices of 3 mm thick. Before bonding, CAD/CAM block surfaces were treated according to the manufacturer's instructions. Groups were created based on the adhesive strategy used: Group 1 (GI) - conventional resin cement + total-etch adhesive system, Group 2 (GII) - conventional resin cement + self-etch adhesive system, and Group 3 (GIII) - self-adhesive resin cement with no adhesive. Bonded specimens were stored in 100% humidity for 24h at 37΀C, and then sectioned with a slow-speed diamond saw to obtain 1 mm × 1 mm × 6 mm microsticks. Microtensile testing was then conducted using a microtensile tester. μTBS values were expressed in MPa and analyzed by one-way ANOVA with post hoc (Tukey) test at the 5% significance level. Results: Mean values and standard deviations of μTBS (MPa) were 17.68 (±2.71) for GI/ceramic; 17.62 (±3.99) for GI/composite; 13.61 (±6.92) for GII/composite; 12.22 (±4.24) for GII/ceramic; 7.47 (±2.29) for GIII/composite; and 6.48 (±3.10) for GIII/ceramic; ANOVA indicated significant differences among the adhesive modality and block interaction (P CAD/CAM restorations, either composite or ceramic, can be significantly affected by different adhesive strategies used. PMID:27076825

  7. Computer-aided topological analysis of Nd-Fe-B ternary system

    International Nuclear Information System (INIS)

    A three-dimensional partially matrixed topological model of the Nd-Fe-B ternary phase diagram has been established based on experimental results assessed comprehensively with the aid of a computer-aided design and graphic and graphics software, AutoCAD (R10), and application programs developed in this work. Vertical sections at 5.88 at.% B, Nd:B = 1:1, Fe-Nd/sub 2/Fe/sub 14/B-Nd, Nd/sub 2/Fe/sub 17/-Nd/sub 2/Fe/sub 7/B/sub 6/ have been cut out from the model and the corresponding phase relationships have been analyzed. Among them, those on the Nd-rich protons of both the sections at 5.88 at.% B and Nd:B = 2:1 and those on the Nd/sub 2/Fe/sub 14/B-Nd section are given for the first time. (author)

  8. A new decomposition-based computer-aided molecular/mixture design methodology for the design of optimal solvents and solvent mixtures

    DEFF Research Database (Denmark)

    Karunanithi, A.T.; Achenie, L.E.K.; Gani, Rafiqul

    2005-01-01

    This paper presents a novel computer-aided molecular/mixture design (CAMD) methodology for the design of optimal solvents and solvent mixtures. The molecular/mixture design problem is formulated as a mixed integer nonlinear programming (MINLP) model in which a performance objective is to be...... optimized subject to structural, property, and process constraints. The general molecular/mixture design problem is divided into two parts. For optimal single-compound design, the first part is solved. For mixture design, the single-compound design is first carried out to identify candidates and then the...... second part is solved to determine the optimal mixture. The decomposition of the CAMD MINLP model into relatively easy to solve subproblems is essentially a partitioning of the constraints from the original set. This approach is illustrated through two case studies. The first case study involves the...

  9. L'analyse d'erreurs comme outil dans la détermination des aides proposées par un EIAH Miscue analysis as a tool to determine aids proposed by an ITS

    Directory of Open Access Journals (Sweden)

    Victor Lafarge

    2007-12-01

    Full Text Available Au travers de l'exemple du projet AMICAL (Architecture Multi-agent, Compagnon pour l'Apprentissage de la Lecture, cet article vise à déterminer dans quelle mesure l'analyse d'erreurs peut nous permettre, en tant que concepteur d'un EIAH (Environnement Informatique pour l'Apprentissage Humain, de mettre en œuvre des aides pertinentes et adaptées. Nous verrons qu'elle doit conduire à différencier ces erreurs, selon leur nature  et leur impact en fonction de l'évolution de l'apprentissage. Nous verrons également qu'elle doit par là conduire à différencier les aides et leur utilisation, (aides vues en tant que réponses aux erreurs. En effet, on peut, selon le cas choisir de les ignorer, de les prévenir, d'intervenir ou encore de favoriser la mise en place chez l'apprenant d'un comportement métacognitif. Nous souhaitons ainsi montrer comment, afin de mettre en place de telles différenciations, nous devons doter notre système d'une certaine capacité à analyser les erreurs en termes de connaissances en jeu, de processus et de stratégies.Through the example of the AMICAL project (reading tutorial system, this paper is aimed at establishing the extent to which miscue analysis can help ITS designers to implement pertinent and appropriate aids. We will see that this analysis must lead us to differentiate mistakes according to their nature and impact, depending on learning advancement. We will also see that this analysis must this way allow us to distinguish various aids and their various uses (aids as feedback to miscues. We can actually, depending on the individual case, choose to ignore some miscues, to prevent others, to intervene or to drive the student to adopt a metacognitive behaviour. We thus hope to show how, in order to set up such differentiations, we have to design a system able to analyse miscues in terms of knowledge to be acquired, process and strategies.

  10. Configuration Method Design for Reconfigurable Manufacturing System with the aid of Plant Simulation

    DEFF Research Database (Denmark)

    Li, Yang; Zhang, Shuai; Bilberg, Arne;

    2014-01-01

    with the help of computer simulation, which is part of the RMS research in University of Southern Denmark. Using Tecnomatix Plant Simulation, 2D models are built for system analysis and optimization, based on which the corresponding 3D models are generated in order to give a direct view of the system...... operation. Following the procedure which is designed in this paper, the (re)configuration of RMS can be managed as part of the daily operation with the help of computer simulation. Keywords: Plant Simulation, Tecnomatix, Reconfigurable Manufacturing System, modular manufacturing....

  11. Transformers analysis, design, and measurement

    CERN Document Server

    Lopez-Fernandez, Xose M; Turowski, Janusz

    2012-01-01

    This book focuses on contemporary economic, design, diagnostics, and maintenance aspects of power, instrument, and high frequency transformers, which are critical to designers for a transformer stations. The text covers such topics as shell type and superconducting transformers as well as coreless PCB and planar transformers. It emphasizes challenges and strategies in transformer design and illustrates the importance of economics in transformers management by reviewing life cycle cost design and the use of decision methods to manage risk.

  12. Design of an Iconic Communication Aid for Individuals in India with Speech and Motion Impairments

    Science.gov (United States)

    Bhattacharya, Samit; Basu, Anupam

    2009-01-01

    India is home to a large number of individuals with significant speech and motion impairments. Many of these individuals are children and neo-literates who have little proficiency in their language of communication. In order to cater to such individuals in India, we have developed Sanyog, an icon-based communication aid. Sanyog accepts a sequence…

  13. DESIGN AN ADVANCE COMPUTER-AIDED TOOL FOR IMAGE AUTHENTICATION AND CLASSIFICATION

    Directory of Open Access Journals (Sweden)

    Rozita Teymourzadeh

    2013-01-01

    Full Text Available Over the years, advancements in the fields of digital image processing and artificial intelligence have been applied in solving many real-life problems. This could be seen in facial image recognition for security systems, identity registrations. Hence a bottleneck of identity registration is image processing. These are carried out in form of image preprocessing, image region extraction by cropping, feature extraction using Principal Component Analysis (PCA and image compression using Discrete Cosine Transform (DCT. Other processing include filtering and histogram equalization using contrast stretching is performed while enhancing the image as part of the analytical tool. Hence, this research work presents a universal integration image forgery detection analysis tool with image facial recognition using Black Propagation Neural Network (BPNN processor. The proposed designed tool is a multi-function smart tool with the novel architecture of programmable error goal and light intensity. Furthermore, its advance dual database increases the efficiency for high performance application. With the fact that, the facial image recognition will always, give a matching output or closest possible output image for every input image irrespective of the authenticity, the universal smart GUI tool is proposed and designed to perform image forgery detection with the high accuracy of ±2% error rate. Meanwhile, a novel structure that provides efficient automatic image forgery detection for all input test images for the BPNN recognition is presented. Hence, an input image will be authenticated before being fed into the recognition tool.

  14. Combinatorial designs constructions and analysis

    CERN Document Server

    Stinson, Douglas R

    2004-01-01

    Created to teach students many of the most important techniques used for constructing combinatorial designs, this is an ideal textbook for advanced undergraduate and graduate courses in combinatorial design theory. The text features clear explanations of basic designs, such as Steiner and Kirkman triple systems, mutual orthogonal Latin squares, finite projective and affine planes, and Steiner quadruple systems. In these settings, the student will master various construction techniques, both classic and modern, and will be well-prepared to construct a vast array of combinatorial designs. Design theory offers a progressive approach to the subject, with carefully ordered results. It begins with simple constructions that gradually increase in complexity. Each design has a construction that contains new ideas or that reinforces and builds upon similar ideas previously introduced. A new text/reference covering all apsects of modern combinatorial design theory. Graduates and professionals in computer science, applie...

  15. Can Automated Imaging for Optic Disc and Retinal Nerve Fiber Layer Analysis Aid Glaucoma Detection?

    Science.gov (United States)

    Banister, Katie; Boachie, Charles; Bourne, Rupert; Cook, Jonathan; Burr, Jennifer M.; Ramsay, Craig; Garway-Heath, David; Gray, Joanne; McMeekin, Peter; Hernández, Rodolfo; Azuara-Blanco, Augusto

    2016-01-01

    Purpose To compare the diagnostic performance of automated imaging for glaucoma. Design Prospective, direct comparison study. Participants Adults with suspected glaucoma or ocular hypertension referred to hospital eye services in the United Kingdom. Methods We evaluated 4 automated imaging test algorithms: the Heidelberg Retinal Tomography (HRT; Heidelberg Engineering, Heidelberg, Germany) glaucoma probability score (GPS), the HRT Moorfields regression analysis (MRA), scanning laser polarimetry (GDx enhanced corneal compensation; Glaucoma Diagnostics (GDx), Carl Zeiss Meditec, Dublin, CA) nerve fiber indicator (NFI), and Spectralis optical coherence tomography (OCT; Heidelberg Engineering) retinal nerve fiber layer (RNFL) classification. We defined abnormal tests as an automated classification of outside normal limits for HRT and OCT or NFI ≥ 56 (GDx). We conducted a sensitivity analysis, using borderline abnormal image classifications. The reference standard was clinical diagnosis by a masked glaucoma expert including standardized clinical assessment and automated perimetry. We analyzed 1 eye per patient (the one with more advanced disease). We also evaluated the performance according to severity and using a combination of 2 technologies. Main Outcome Measures Sensitivity and specificity, likelihood ratios, diagnostic, odds ratio, and proportion of indeterminate tests. Results We recruited 955 participants, and 943 were included in the analysis. The average age was 60.5 years (standard deviation, 13.8 years); 51.1% were women. Glaucoma was diagnosed in at least 1 eye in 16.8%; 32% of participants had no glaucoma-related findings. The HRT MRA had the highest sensitivity (87.0%; 95% confidence interval [CI], 80.2%–92.1%), but lowest specificity (63.9%; 95% CI, 60.2%–67.4%); GDx had the lowest sensitivity (35.1%; 95% CI, 27.0%–43.8%), but the highest specificity (97.2%; 95% CI, 95.6%–98.3%). The HRT GPS sensitivity was 81.5% (95% CI, 73.9%–87.6%), and

  16. Computer-Assisted Mandibular Reconstruction using a Patient-Specific Reconstruction Plate Fabricated with Computer-Aided Design and Manufacturing Techniques

    OpenAIRE

    Wilde, Frank; Cornelius, Carl-Peter; Schramm, Alexander

    2014-01-01

    We investigated the workflow of computer-assisted mandibular reconstruction that was performed with a patient-specific mandibular reconstruction plate fabricated with computer-aided design and computer-aided manufacturing (CAD/CAM) techniques and a fibula flap. We assessed the feasibility of this technique from virtual planning to the completion of surgery.

  17. Design of an automotive frame cross member for the hydro-forming process using computer aided engineering

    Energy Technology Data Exchange (ETDEWEB)

    Kim, K.J.; Han, C.P.; Sung, C.W. [Department of Automobile Enginering, Seojeong College, Gyeong-gi-do (Korea); Lim, E.J. [Divison of Fire Protection and Safety, Seojeong College, Gyeong-gi-do (Korea); Choi, B.I. [Nano Mechanics Team, Korea Institute of Machinery and Materials, Taejon (Korea); Oh, S. [Department of Automobile Engineering, Seoul College University, Seoul (Korea); Park, J.H. [Department of Mechatronics Engineering, College of Engineering, Tongmyong University, Busan (Korea); Won, S.T. [Department of Die and Mould Design, Seoul National Univesity of Technology, Seoul (Korea); Kim, S.S. [School of Nano and Advanced Materials Science and Engineering, Gyeongsang National University, Gyeongnam (Korea)

    2010-05-15

    Hydroforming is a forming technology in which a steel tube is set in a die and formed to fit a specified shape by applying hydraulic pressure from inside the tube while also applying force in the tube axial direction (axial feed). In the present study, the whole process chain of frame component (cross member) simulation and development by hydroforming technology to apply to a high strength steel having a tensile strength of 440 MPa grade is studied. At the part design stage, a feasibility study and process design aided by CAE (Computer Aided Design) to confirm the hydroformability in detail is required. The overall possibility of the hydroformability of the frame part could be examined by cross sectional analyses. Moreover, it is essential to ensure the formability of the tube material in every forming step such as pre-bending and hydroforming. At the die design stage, all the components of the prototyping tool are designed and the interference with the press is investigated from the geometry. For the improvement of tube thinning, the hydroforming was carried out adding an axial feeding of 45 mm at both ends of the part for supplying materials to the end zone where thinning occurs and retards burst. From this treatment, the thinning of the tube wall was experimentally measured and it was improved by 17.9%. It is in good agreement with the calculation and the position of the maximum thinning corresponds to the result of the simulation. (Abstract Copyright [2010], Wiley Periodicals, Inc.)

  18. Finite element analysis of a percutaneous aortic valve stent design

    Directory of Open Access Journals (Sweden)

    Lazar Mathew

    2009-06-01

    Full Text Available Aim: This paper discusses the design and Finite Element Analysis (FEA of a Percutaneous Aor-tic Valve Stent. The aim of this study was to model a percutaneous aortic valve stent and subject it to finite element analysis. The design process was carried out to meet the functional and surgical requirements. Methods and Results: Analysis was done with different materials with loads ranging from 50 kgf/mm² to 73 kgf/mm². These forces were selected because these val-ues are far greater than the normal human blood pressure which ranges from 10kPa to 16kPa. It was also to understand the mechanical behavior of different stent materials under such high pressures. A stent model was generated and its physical, mechanical and behavioral properties were studied. Finite element analysis and simulation of the model enhanced the designer to optimize the geometry suitable for perform-ance during and after implantation. The design objective for the stent is to have long term du-rability, low thrombogenicity, resistance to mi-gration and paravalvular leak. Conclusion: The analysis performed in this paper may aid in understanding the stent’s tolerable pressures ranges in comparison with the physiological pressures exerted by the heart and cardiac blood flow during abnormal cardiovascular conditions.

  19. COMMAND: A FORTRAN program for simplified composite analysis and design. [computerized design of multilayered composite panels

    Science.gov (United States)

    Vanderplaats, G. N.

    1976-01-01

    A FORTRAN program is presented for preliminary analysis and design of multilayered composite panels subjected to inplane loads. All plys are of the same material. The composite is assumed symmetric about the midplane, but need not be balanced. Failure criterion includes limit ply strains and lower bounds on composite inplane stiffnesses. Multiple load conditions are considered. The required input data is defined and examples are provided to aid the use in making the program operational. Average panel design times are two seconds on an IBM 360/67 computer. Results are compared with published literature. A complete FORTRAN listing of program COMAND is provided. In addition, the optimization program CONMIN is required for design.

  20. AVD: A new system for computer-aided analysis of wall movement abnormalities; first results

    International Nuclear Information System (INIS)

    A man-machine comparison proves the reliability of the new computer-based system. The results with and without the ADV-system agree to a high degree. The computer-aided analysis with two different models yields qualitatively and quantitatively similar results. With the computer-aided system one can save 90% of the time, compared to the manual technique; this is an essential prerequisite for the wide application of quantitative analysis of wall movements. The possibility for a quantitative analysis of wall movements is the basis for inter- and intraindividual comparisons after interventions, i.e. exercise tests, applications of pharmaceuticals or after by-pass surgery. The flexibility of the system allows checks of the result by a repetition of the analysis with a different model. This way the reliability of the findings is improved. The ADV-system in its present shape needs some changes in its program, improved handling and a faster graphic terminal. Common plotters are better than the currently used modified printer. Also, the program should be extended in its new version for batch-processing, i.e. independent of the operator it should process serial analysis of patient collectives. These suggestions have been accepted by the manufacturer in the meantime, and modifications will be made. (orig.)

  1. Design of a high-sensitivity classifier based on a genetic algorithm: application to computer-aided diagnosis

    International Nuclear Information System (INIS)

    A genetic algorithm (GA) based feature selection method was developed for the design of high-sensitivity classifiers, which were tailored to yield high sensitivity with high specificity. The fitness function of the GA was based on the receiver operating characteristic (ROC) partial area index, which is defined as the average specificity above a given sensitivity threshold. The designed GA evolved towards the selection of feature combinations which yielded high specificity in the high-sensitivity region of the ROC curve, regardless of the performance at low sensitivity. This is a desirable quality of a classifier used for breast lesion characterization, since the focus in breast lesion characterization is to diagnose correctly as many benign lesions as possible without missing malignancies. The high-sensitivity classifier, formulated as the Fisher's linear discriminant using GA-selected feature variables, was employed to classify 255 biopsy-proven mammographic masses as malignant or benign. The mammograms were digitized at a pixel size of 0.1mmx0.1mm, and regions of interest (ROIs) containing the biopsied masses were extracted by an experienced radiologist. A recently developed image transformation technique, referred to as the rubber-band straightening transform, was applied to the ROIs. Texture features extracted from the spatial grey-level dependence and run-length statistics matrices of the transformed ROIs were used to distinguish malignant and benign masses. The classification accuracy of the high-sensitivity classifier was compared with that of linear discriminant analysis with stepwise feature selection (LDAsfs). With proper GA training, the ROC partial area of the high-sensitivity classifier above a true-positive fraction of 0.95 was significantly larger than that of LDAsfs, although the latter provided a higher total area (Az) under the ROC curve. By setting an appropriate decision threshold, the high-sensitivity classifier and LDAsfs correctly identified

  2. Integration and implementation of an automated piping analysis/design system and CAE drawing system

    International Nuclear Information System (INIS)

    The presentation will focus on the Computer Assisted Piping Analysis and Support Design (CASD) System, its description, development process, and capabilities relative to modeling, design, analysis, and computer aided drafting of nuclear power plant piping systems and concomitant pipe supports and/or hangers. During the course of the presentation, management approaches to such issues as development goals and objectives, development program, control of the development process, equipment and communication requirements, implementation, and maintenance will be addressed in addition to some lessons learned

  3. Computer-aided methods for analysis and synthesis of supersonic cruise aircraft structures

    Science.gov (United States)

    Giles, G. L.

    1976-01-01

    Computer-aided methods are reviewed which are being developed by Langley Research Center in-house work and by related grants and contracts. Synthesis methods to size structural members to meet strength and stiffness (flutter) requirements are emphasized and described. Because of the strong interaction among the aerodynamic loads, structural stiffness, and member sizes of supersonic cruise aircraft structures, these methods are combined into systems of computer programs to perform design studies. The approaches used in organizing these systems to provide efficiency, flexibility of use in an iterative process, and ease of system modification are discussed.

  4. Planar Inlet Design and Analysis Process (PINDAP)

    Science.gov (United States)

    Slater, John W.; Gruber, Christopher R.

    2005-01-01

    The Planar Inlet Design and Analysis Process (PINDAP) is a collection of software tools that allow the efficient aerodynamic design and analysis of planar (two-dimensional and axisymmetric) inlets. The aerodynamic analysis is performed using the Wind-US computational fluid dynamics (CFD) program. A major element in PINDAP is a Fortran 90 code named PINDAP that can establish the parametric design of the inlet and efficiently model the geometry and generate the grid for CFD analysis with design changes to those parameters. The use of PINDAP is demonstrated for subsonic, supersonic, and hypersonic inlets.

  5. An integrated pip stress analysis and pipe support design environment for the CANDU 3 project

    International Nuclear Information System (INIS)

    The promise of significant labour cost savings prompted AECL to automate the CANDU reactor piping systems design. By using a combination of commercial and AECL-developed computer-aided engineering software, the effort required to perform two key tasks, pipe stress analysis and support design, was reduced significantly. This paper describes the integrated piping design environment developed for the CANDU 3 project and benefits derived from its use

  6. User interface and database design for software database of the Computer Aided Prototyping System (CAPS)

    OpenAIRE

    Hong, Ruey-Wen

    1996-01-01

    CAPS (Computer Aided Prototyping System) is an integrated set of software tools that generate prototypes directly from real time requirements. The success of CAPS depends on being able to generate the prototype quickly so that it can be evaluated, leading to the construction of a program built on true requirements thereby resulting in a better software product. The key to developing prototypes quickly is having a significant software base to choose reusable components from. The problem with t...

  7. New approach to produce special purpose visual aid glasses : a custom designed 5-axis mill

    OpenAIRE

    Fjelde, Bjørn; Stamsø, Alexander

    2011-01-01

    The thesis problem formulation is given by the company ProVista. ProVistas area of expertise is mainly the rehabilitation of visually impaired. This includes research, training of opticians and sale of supporting materials such as glasses with magni cation. The thesis problem is a part of the research to give their customers a better product with much shorter delivery time. Today the customers normally have to wait several weeks to get their visual aid glasses. The reason for this...

  8. Aerodynamic heating and surface temperatures on vehicles for computer-aided design studies

    Science.gov (United States)

    Dejarnette, F. R.; Kania, L. A.; Chitty, A.

    1983-01-01

    A computer subprogram has been developed to calculate aerodynamic and radiative heating rates and to determine surface temperatures by integrating the heating rates along the trajectory of a vehicle. Convective heating rates are calculated by applying the axisymmetric analogue to inviscid surface streamlines and using relatively simple techniques to calculate laminar, transitional, or turbulent heating rates. Options are provided for the selection of gas model, transition criterion, turbulent heating method, Reynolds Analogy factor, and entropy-layer swallowing effects. Heating rates are compared to experimental data, and the time history of surface temperatures are given for a high-speed trajectory. The computer subprogram is developed for preliminary design and mission analysis where parametric studies are needed at all speeds.

  9. Application of computer-aided engineering optimum design method in aluminum profile extrusion mould

    Institute of Scientific and Technical Information of China (English)

    帅词俊; 肖刚; 倪正顺; 钟掘

    2003-01-01

    The finite element analysis and the optimum design of aluminum profile extrusion mould were investigated using the ANSYS software and its parameterized modeling method. The optimum dimensions of the mould were obtained. It is found that the stress distribution is very uneven, and the stress convergence is rather severe in the bridge of the aluminum profile extrusion mould. The optimum height of the mould is 70. 527 mm, and the optimum radius of dividing holes are 70. 182 mm and 80. 663 mm. Increasing the height of the mould in the range of 61. 282 mm to 70. 422 mm can prolong its longevity, but when the height is over 70. 422 mm, its longevity reduces.

  10. Computer Aided Design and Simulation of a Multiobjective Microstrip Patch Antenna for Wireless Applications

    Directory of Open Access Journals (Sweden)

    Chitra Singh

    2011-03-01

    Full Text Available The utility and attractiveness of microstrip antennas has made it ever more important to find ways to precisely determine the radiation patterns of these antennas. Taking benefit of the added processing power of today’s computers, electromagnetic simulators are emerging to perform both planar and 3D analysis of high-frequency structures. One such tool studied was IE3D, which is a program that utilizes method of moment. This paper makes an investigation of the method used by the program, and then uses IE3D software to construct microstrip antennas and analyze the simulation results. The antenna offers good electrical performance and at the same time preserves the advantages of microstrip antennas such as small size, easy to manufacture as no lumped components are employed in the design and thus, is low cost; and most importantly, it serves multiple wireless applications.

  11. Design and analysis of experiments with SAS

    CERN Document Server

    Lawson, John

    2010-01-01

    IntroductionStatistics and Data Collection Beginnings of Statistically Planned Experiments Definitions and Preliminaries Purposes of Experimental Design Types of Experimental Designs Planning Experiments Performing the Experiments Use of SAS SoftwareCompletely Randomized Designs with One Factor Introduction Replication and Randomization A Historical Example Linear Model for Completely Randomized Design (CRD) Verifying Assumptions of the Linear Model Analysis Strategies When Assumptions Are Violated Determining the Number of Replicates Comparison of Treatments after the F-TestFactorial Designs

  12. Using GREENSCOPE Indicators for Sustainable Computer-Aided Process Evaluation and Design

    Science.gov (United States)

    Manufacturing sustainability can be increased by educating those who design, construct, and operate facilities, and by using appropriate tools for process evaluation and design. The U.S. Environmental Protection Agency's GREENSCOPE methodology and tool, for evaluation and design ...

  13. Computer-aided design of large-scale integrated circuits - A concept

    Science.gov (United States)

    Schansman, T. T.

    1971-01-01

    Circuit design and mask development sequence are improved by using general purpose computer with interactive graphics capability establishing efficient two way communications link between design engineer and system. Interactive graphics capability places design engineer in direct control of circuit development.

  14. Application of a Novel Ant Algorithm Termed Continuous Gridded in Aidded Drug Design%Application of a Novel Ant Algorithm Termed Continuous Gridded in Aidded Drug Design

    Institute of Scientific and Technical Information of China (English)

    陈国华; 陆瑶

    2011-01-01

    Aimed at solving continuous optimum parameter problems effectively in added drug design, this paper develops a novel ant algorithm termed continuous gridded ant colony (CGAC), where the spy ants are utilized to search the latent optimum grid in the domain completely and effectively. In order to test the effect, the CGAC algorithm was success in finding the best values of C and y, when the support vector machine (SVM) was used to fit the nonlinear relationship between the numerical representation of the chemical structure and IC50. The genetic algorithm (GA) was also used to obtain the appropriate feature subset simultaneously, because feature subset selection influences the appropriate kernel parameters and vice versa. The obtained results illustrate that GA-CGAC-SVM models have satisfactory prediction accuracy. The best quantitative modeling results in thirteen-descriptors model based on GA-CGAC-SVMr with mean-square errors 0.397, a predicted correlation coefficient (R2) 0.842, and a cross-validated correlation coefficient (Q^2) 0.756. The best classification result was found using SVM: the percentage (%) of correct prediction based on 7-fold cross-validation was 90.6%. The results demonstrate that the proposed CGAC algorithm provides a new and effective method to find the optimum parameters when the SVM tool is used.

  15. Software Design for Smile Analysis

    OpenAIRE

    Sarkhosh, A.; Noroozi, H.; D. Gholami Borujeni; Rafatjoo, R.; Sodagar, A.

    2010-01-01

    Introduction: Esthetics and attractiveness of the smile is one of the major demands in contemporary orthodontic treatment. In order to improve a smile design, it is necessary to record “posed smile” as an intentional, non-pressure, static, natural and reproducible smile. The record then should be analyzed to determine its characteristics. In this study, we intended to design and introduce a software to analyze the smile rapidly and precisely in order to produce an attractive smile for the pat...

  16. Integrated Computer-aided Framework for Sustainable Chemical Product Design and Evaluation

    DEFF Research Database (Denmark)

    Kalakul, Sawitree; Cignitti, Stefano; Zhang, Lei;

    2016-01-01

    This work proposes an integrated model-based framework for chemical product design and evaluation based on which the software, VPPD-Lab (The Virtual Product-Process Design Laboratory) has been developed. The framework allows the following options: (1) design a product using design templates, such...... product design templates when the desired template is not available. The product design templates follow the same common steps in the workflow for a product type but have options to employ product specific property models, data and calculation routines, if necessary. This paper highlights the application...... of the templates for three case studies: (i) the design of a refrigeration cycle, (ii) a mixture/blend design problem involving lubricant design and (iii) a tailor-made product design of jet-fuels (blended chemical products)....

  17. Modification to the Monte Carlo N-Particle (MCNP) Visual Editor (MCNPVised) to Read in Computer Aided Design (CAD) Files

    International Nuclear Information System (INIS)

    Monte Carlo N-Particle Transport Code (MCNP) is the code of choice for doing complex neutron/photon/electron transport calculations for the nuclear industry and research institutions. The Visual Editor for Monte Carlo N-Particle is internationally recognized as the best code for visually creating and graphically displaying input files for MCNP. The work performed in this grant was used to enhance the capabilities of the MCNP Visual Editor to allow it to read in both 2D and 3D Computer Aided Design (CAD) files, allowing the user to electronically generate a valid MCNP input geometry

  18. Trajectories of Japanese and South Korean Environmental Aid:A Comparative Historical Analysis

    OpenAIRE

    Tonami, Aki; Müller, Anders Riel

    2014-01-01

    Environmental aid has become a major component of development aid. We analyzed the contingent characters of environmental aid of Japan and South Korea using the definition of Williams, which regards aid policy as donor driven and autobiographical of the donor agencies and societies from which they sprang. Both Japan and South Korea consider environmental aid as an important tool of their diplomacy. A combination of a moral obligation and domestic, international, political, and economic intere...

  19. Asynchronous sequential machine design and analysis

    CERN Document Server

    Tinder, Richard

    2009-01-01

    Asynchronous Sequential Machine Design and Analysis provides a lucid, in-depth treatment of asynchronous state machine design and analysis presented in two parts: Part I on the background fundamentals related to asynchronous sequential logic circuits generally, and Part II on self-timed systems, high-performance asynchronous programmable sequencers, and arbiters.Part I provides a detailed review of the background fundamentals for the design and analysis of asynchronous finite state machines (FSMs). Included are the basic models, use of fully documented state diagrams, and the design and charac

  20. Experiment Design and Analysis Guide - Neutronics & Physics

    Energy Technology Data Exchange (ETDEWEB)

    Misti A Lillo

    2014-06-01

    The purpose of this guide is to provide a consistent, standardized approach to performing neutronics/physics analysis for experiments inserted into the Advanced Test Reactor (ATR). This document provides neutronics/physics analysis guidance to support experiment design and analysis needs for experiments irradiated in the ATR. This guide addresses neutronics/physics analysis in support of experiment design, experiment safety, and experiment program objectives and goals. The intent of this guide is to provide a standardized approach for performing typical neutronics/physics analyses. Deviation from this guide is allowed provided that neutronics/physics analysis details are properly documented in an analysis report.