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A generalized multi-commodity network flow model for space exploration logistics

A generalized multi-commodity network flow model for space e...

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AIAA SPACE 2013 conference and exposition

作者： Ishimatsu, Takuto de Wecky, Olivier Hoffmanz, Jeffrey Ohkami, Yoshiaki Shishko, Robert Massachusetts Institute of Technology Engineering Systems Division Cambridge MA 02139 United States Massachusetts Institute of Technology Department of Aeronautics and Astronautics Engineering Systems Division Cambridge MA 02139 United States Massachusetts Institute of Technology Department of Aeronautics and Astronautics Cambridge MA 02139 United States Keio University System Design and Management Research Institute Yokohama 223-8526 Japan Jet Propulsion Laboratory California Institute of Technology Mission Systems Concepts Section Pasadena CA 91109 United States

ISBN: (数字)9781624102394

ISBN: (纸本)9781624102394

In transition to a new era of human space exploration, the question is what the next- generation space logistics paradigm should be. The past studies on space logistics have been mainly focused on a "vehicle" perspective such as propulsive feasibility, cargo capacity constraints, and manifesting strategies, with the arbitrarily predetermined logistics network. But how do we select an optimal logistics network? Especially if we can utilize in- situ resources on the Moon and Mars, it will add complexity to network selection problem. The objective of this paper is to develop a comprehensive graph-theoretic modeling framework to quantitatively evaluate and optimize space exploration logistics from a "network" perspective. In an attempt to create such a modeling framework, we develop a novel network flow model referred to as the generalized multi-commodity network flow (GMCNF) model. On top of the classical network flow problems, the GMCNF model proposed in this paper introduces three types of matrix multiplications (requirement, transformation, and concurrency), and also allows loop edges associated with nodes (graph loops) and multiple edges between the same end nodes (multigraph). With this modification, the model can handle multiple commodities that interact with each other in the form of requirement at nodes, transformation on edges, and concurrency within edges. A linear programming (LP) formulation of the GMCNF model is applied to human exploration of Mars. First we solve the baseline problem with a demand that is equivalent to that of the NASA's Mars design Reference Architecture (DRA) 5.0 scenario. It is found that the solution saves 67.5% from the Mars DRA 5.0 reference scenario in terms of the initial mass in low-Earth orbit (IMLEO) primarily because chemical (LOX/LH2) propulsion is used along with oxygen-rich ISRU. We also present one possible scenario with two "gateway" resource depots at GTO and DTO with orbital transfer vehicles (OTVs) running in the cislu

关键词： Problem solving

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Application and research of subway station modeling system based on VRML

Application and research of subway station modeling system b...

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2013 International conference on Geo-Informatics in Resource Management and Sustainable Ecosystem, GRMSE 2013

作者： Zhang, Lin School of Electricity and Information Engineering BUCEA Beijing 100044 China

ISBN: (纸本)9783642419072

Virtual reality is a integrated information technology, which combines digital image processing, computer graphics, multimedia technology and sensor technology. It has a broad prospect for application in the fields of architecture, tourism, military and computer game design. This paper introduces the constituent of VR, VRML work principle and characteristics, gives a detailed analysis of the key technology of the subway station modeling system with the Huangzhuang station as the background. © Springer-Verlag Berlin Heidelberg 2013.

关键词： Subway stations

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LEAPFROG Generation-X: Exploring modularized martian robotic exploration through crowdsourcing the open-source community

LEAPFROG Generation-X: Exploring modularized martian robotic...

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AIAA SPACE 2013 conference and exposition

作者： Ortega, Michael S. Thakur, Anubhav Aldana, Eduardo Jacobs, Michael Kranenburg, Pieter Coco, Alexander Ybarra, Andy Coria, Antonio Armour, Ayinde Vogt, Carson Gomez, Christopher Pinzon, Daniel Monga, Dhruv Meine, Greg Sharifazadeh, Hossein Lam, Megan Brito, Noe Mckie, Sidney Vierma, Simon University of Southern California Astronautical Engineering Rapp Research Building 225 Los Angeles CA 9008 United States

ISBN: (纸本)9781624102394

With the increasing privatization of space exploration, the interest and willingness of the public to participate in the development of space technology has reached an unprecedented scale. Within this environment, LEAPFROG Generation-X (Gen-X) seeks to develop a proof-of-concept of a standardized platform that would serve to enable future exploration of the solar system. Gen-X builds upon the initial work done by the team that developed the Lunar Entry and Approach Platform for Research on Ground (LEAPFROG) Generation-0 platform. Generation-0 was originally conceived as a solution to challenges encountered in ground testing lunar landing technologies by utilizing low-cost, Commercial-Off-The-Shelf (COTS) components. However, LEAPFROG Gen-X is a vehicle designed to serve as a robotic precursor to human exploration of the Martian surface. The mission architecture that drove the design was the goal of delivering a capsule carrying multiple Gen-X landers, each with slightly less capable instrumentation than previous Mars landers, which would be disbursed across a wide swath of terrain to carry out a surveying mission as a prelude to a human landing. The concept was a synthesis of small satellite constellation architectures with the large-scale NASA Mars Exploration Program. The result was a lander design that fit within a 40x40x40 inch envelope. Toward building a robust flight and control system, this research will also leverage crowdsourcing of experts and hobbyists through internet blogs and forums. The primary research objective will be to carry out a successful 10 minute, autonomous flight. To enable this open-source development, a BeagleBone board computer will be used for flight and control systems. BeagleBone uses an ARM-based microprocessor with the open-source Linux operating system. The microprocessor will be programmed in C++ to control digital outputs for thruster activation and pulse width modulation for jet engine RPM control. Since C++ is widely used and

关键词： Crowdsourcing

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modeling, simulation & analysis of whole body vibration for two wheeler

Modeling, simulation & analysis of whole body vibration for ...

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8th SAEINDIA International Mobility conference and exposition and Commercial Vehicle engineering Congress 2013, SIMCOMVEC 2013

作者： Tathe, Shantanu Rohidas Wani, Kiran P. CoEP-ARAI Academy India Faculty ARAI Academy India

Whole body vibration deals with the biodynamic responses of human body in various postures. Vertical vibration exposure in sitting posture is common situation encountered while driving vehicle or riding motorcycle. We have chosen Wan & Schimmel's 4 DOF biodynamic model for this study by referring the goodness of fit results for various models available in the literature. A single degree of freedom model of motorcycle is used for analysis of whole body vibration on two wheeler. We have neglected pitch, yaw movements of two wheeler for purpose of simplicity. Whole body vibration analysis for human body in sitting posture is described by three terms i.e. Seat to Head Transmissibility (STH), Driving point impendence (DPM) & apparent mass (AP). In order to analyze human response on motorcycle Road to head (RTH), Road to lower torso (RTLT), Road to viscera (RTV), Road to upper torso (RTUT) responses are calculated for different motorcycle suspension natural frequencies. Simulation of biodynamic model is carried in MATLAB which shows close match with experimental results from literature. Analysis shows that peak values occur at 3.97 Hz, 6.77 Hz & 3.24 Hz for STH, DPM & AP respectively. For 4 Hz suspension natural frequency of motorcycle, most severe RTH, RTUT, RTV, RTLT responses are noted. These responses are severe in the two wheeler suspension natural frequency range of 3.5 Hz to 5.5 Hz. This study will help in better design & also in improving the ride & handling performance of two wheeler. © 2013 SAE International.

关键词： Motorcycles

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Proactive ergonomics through digital human modeling and simulation for product design innovation: A case study

Proactive ergonomics through digital human modeling and simu...

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International Computer Science and engineering conference (ICSEC)

作者： B. Uday Kumar Abhinandan Bora J. Sanjog Sougata Karmakar Department of Design IIT Guwahati Assam India Dept. of Mechanical. Engg. NIT Silchar Assam India

Now-a-days, it is a very common trend for youth to go for regular gymnasium for muscular body building or eliminating extra fat. Most of the equipments used for these purposes are generally for indoor exercises. Thus there is least scope of rigorous outdoor exercise in open air environment. An attempt has been made by the present authors to develop a concept model of Ergometer which is to be installed in open space like park. After a small user survey and brain storming, it was decided that the intended design should be unique in look; aesthetically appealing; compatible for both adult Indian male and female; easy to use and most interestingly, it would be motivational factor for people to continue their exercise for longer duration. People would feel happy because more battery (inbuilt) recharging would happen if they go for intense and longer duration exercise. Those batteries would be used in night for illuminating the park. Innovative concept model of the Ergometer was evaluated and subsequently, design was modified by providing more human-centric inputs (various adjustable features for anthropometric compatibility; easy reach towards handle, clearance dimensions, inputs for riding comfort etc.) through proactive virtual ergonomics techniques using digital human modeling and simulation.

关键词： Computer science conferences

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A conceptual custom super-computer design for real-time simulation of human brain

A conceptual custom super-computer design for real-time simu...

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Iranian conference on Electrical engineering (ICEE)

作者： Nasim Farahini Ahmed Hemani Information and Communication Technology Royal Institute of Technology Stockholm Sweden

ISBN: (纸本)9781467356329

In this paper, we introduce BRIC, a novel custom multi-chip digital computer architecture for simulating in realtime a model of human brain in form of a spiking Bayesian Confidence Propagation Neural Network (BCPNN). The design is conceptually dimensioned for available technology in 2015-2020 with the estimated size of a pizza box, consuming less than 3 kWs of power, delivering 800 Teraflops/sec (single precision multiply operation) and 30 TBs of memory. To the best of our knowledge, this will be the smallest and lowest power real-time brain simulation engine if manufactured. The silicon and computational efficiencies come from use of 3D memory stacking, innovation in algorithm and architectural customization. The chip will be programmable allowing experimentation with variants of the BCPNN brain model.

关键词： Computational modeling Brain modeling Bandwidth Memory management Fabrics Neurons Random access memory

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Ergonomic risk reduction to enhance lean transformation

Ergonomic risk reduction to enhance lean transformation

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IIE Annual conference and Expo 2013

作者： Aqlan, Faisal Lam, Sarah S. Testani, Michael Ramakrishnan, Sreekanth Department of Systems Science and Industrial Engineering State University of New York at Binghamton Binghamton NY 13902 United States IBM Corporation 1701 North St. Endicott NY 13760 United States IBM Corporation 404 Wyman St. Waltham MA 02451 United States

ISBN: (纸本)9780983762423

Workplace ergonomics is becoming more important for manufacturing environments. Effective ergonomic strategies can increase productivity, reduce work injuries, and improve workstation design and layout. Workplace ergonomics and lean manufacturing are highly inter-related. Ergonomic risks can lead to lean wastes and vice versa. Ergonomics can support lean transformation and lean transformation can lead to ergonomic risk reduction. This research utilizes traditional lean tools, including value stream mapping, Fishbone analysis, and spaghetti diagrams, for ergonomic risk assessment to enhance a Lean transformation. A framework for integrating ergonomic risk assessment with lean is proposed in this study. Implementing lean techniques is based on five main steps: identify value, map value stream, create flow, establish pull, and seek perfection. Ergonomic assessment consists of needs identification, risk mapping, risk assessment, risk elimination, and standardization. The proposed framework combines lean and ergonomic steps to effectively eliminate lean and ergonomic wastes. A case study supported by digital human modeling from a high-end server manufacturing environment is presented. It is shown that using the proposed framework to implement ergonomic improvements to the current manual processes in server manufacturing will reduce the ergonomic risks, increase operators' performance, and improve corporate image. These ergonomic improvements support Lean transformation by eliminating the related lean wastes.

关键词： Ergonomics

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design of 3-D Phantoms for human Carotid Vasculature

Design of 3-D Phantoms for Human Carotid Vasculature

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International conference on Advances in Computing and Communications (ICACC)

作者： Ankita Banerjee Sudipta Dey Shubhankar Parui Mita Nasipuri Subhadip Basu Department of Computer Science & Engineering Jadavpur University Kolkata India Jadavpur University Kolkata West Bengal IN

Structural analysis of human carotid vasculature is important for in-depth clinical understanding and to delineate the underlying hemodynamics. Due to the natural difficulty in real-life patient study or ex-vivo analysis, digital phantom based experiments are gathering momentum. design of accurate/approximate digital cerebro-vascular phantoms is of active interest, due to its acceptability in a wide range of simulation experiments. In this work, we discuss the theory and methods related to the design of 3-D mathematical models of human carotid arterial tree. These approximate phantoms are designed using sphere-based tubular structures, with a help of a custom-designed 2-D/3-D user interface. Multiple tubular structures with varying diameters are combined using piece-wise cubic Bèzier Curves to generate the complete arterial phantom, around the Circle of Willis. We propose robust mathematical models for the design of multilevel bifurcation phantoms with varying diameters. Qualitative analysis of the design strategy is presented with suitable 3-D rendering.

关键词： Phantoms Arteries Rendering (computer graphics) Mathematical model Computational modeling Computed tomography Blood

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Synthetic reconstruction of human carotid vasculature using a 2-D/3-D interface

Synthetic reconstruction of human carotid vasculature using ...

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International conference on Advances in Computing, Communications and Informatics (ICACCI)

作者： Ankita Banerjee Sudipta Dey Shubhankar Parui Mita Nasipuri Subhadip Basu Department of Computer Science & Engineering Jadavpur University Kolkata India

Synthetic reconstruction of the human carotid vasculature is important for various experimental research related to in-depth clinical understanding of the underlying hemodynamics. design of accurate/approximate digital cerebro-vascular phantoms is a complex and difficult task, especially due to its complex geometry and interconnections. In this work, we have developed a 2-D/3-D interface for mathematical reconstruction of both approximate and accurate carotid arterial tree. Theory and methods related to the design of 3-D mathematical models are also discussed in details. The approximate phantoms are designed using sphere-based tubular structures, with a help of a custom-designed 2-D/3-D user interface. Accurate phantoms are designed from the patient's CTA images using an interactive mapping interface. In both the cases, multiple tubular structures with varying diameters are combined using piecewise cubic Bèzier Curves to generate the complete arterial phantom, around the Circle of Willis. Multi-level bifurcation phantoms with varying diameters are also presented with a qualitative analysis of the findings.

关键词： Phantoms Rendering (computer graphics) Mathematical model Carotid arteries Computational modeling

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Manual Assembly Workstation Redesign Based on a New Quantitative Method for Postural Comfort Evaluation

Manual Assembly Workstation Redesign Based on a New Quantita...

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2013 4th International conference on Applied Mechanics and Mechanical engineering(ICAMME 2013)

作者： Alessandro Naddeo Nicola Cappetti Rosaria Califano Mariarosaria Vallone Dept.of Industrial Engineering University of Salerno

Main purpose of this work is to show how easy and economics an ergonomic/comfort based approach, in re-design a manual assembly workplace, can be;authors, using a new comfort/ergonomic evaluation criterion, analyzed a workstation and identified the critical issues under ergonomic/comfort point of view and finally gave several guidelines to re-design the workplace, implementing minor modification, and improve work-safety, work-quality and productivity. The postural analysis was performed by non-invasive and especially inexpensive methods, based on cameras and video-recorder use and by photogrammetric analysis;DELMIA DHM software has been used to perform all simulations;comfort analysis was performed by the software developed by researchers of Departments of Industrial engineering of Salerno: CaMA. The test case is an automatic assembly machine that has been modeled and used for virtual postural analysis. Main results of this work can be found in a very good numerical/experimental correlation between acquired/simulated postures and real ones, and on the powerful use of an objective comfort evaluation method, based on biomechanics and posture analysis, for giving to designers the guidelines to re-design a workplace and a work-cycle. This kind of approach seemed to be very powerful in re-designing the work-place and in re-scheduling the work time-sheet because it allowed to improve an ergonomic corrective action with minor costs for company. Obtained results demonstrated the validity of re-design hypotheses through the increase of all comfort indexes and the improvement of workstation/operator productivity.

关键词： Ergonomics Re-design Comfort Evaluation Criteria Not-invasive postural analysis digital human modeling

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