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Understanding and Exploiting Information Spreading and Integrating Technologies

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Journal of Computer Science & Technology 2011年第5期26卷 829-836页

作者： petter Holme Mikael Huss IceLab Department of PhysicsUme a University901 87 Ume aSweden Department of Energy Science Sungkyunkwan University Science of Life Laboratory Stockholm Karolinska Institute Science ParkBox 1031171 21 SolnaSweden Department of Biochemistry and Biophysics The Arrhenius Laboratories for Natural SciencesStockholm University 106 91 StockholmSweden

Our daily life leaves an increasing amount of digital traces,footprints that are improving our ***-mining tools,like recommender systems,convert these traces to information for aiding decisions in an ever-increasing number of areas in our *** feedback loop from what we do,to the information this produces,to decisions what to do next,will likely be an increasingly important factor in human behavior on all levels from individuals to *** this essay,we review some effects of this feedback and discuss how to understand and exploit them beyond mapping them on more well-understood *** take examples from models of spreading phenomena in social media to argue that analogies can be deceptive,instead we need to fresh approaches to the new types of data,something we exemplify with promising applications in medicine.

关键词： modeling and prediction computer-supported collaborative work health care

Substance graphs are optimal simple-graph representations of metabolism

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Chinese Science Bulletin 2010年第27期55卷 3161-3168页

作者： HOLME petter HUSS Mikael Department of Physics Ume University Department of Energy Science Sungkyunkwan University Science for Life Laboratory Stockholm Box 1031 171 21 SolnaSweden Computational and Systems Biology Genome Institute of Singapore

One approach to study the system-wide organization of biochemistry is to use statistical graph *** such heavily simplified methods,which disregard most of the dynamic aspects of biochemistry,one is faced with fundamental *** such question is how the chemical reaction systems should be reduced to a graph retaining as much functional information as possible from the original reaction *** these graph representations,should the edges go between substrates and products,or substrates and substrates,or both?Should vertices represent substances or reactions?Different representations encode different information about the reaction system and affect network measures in different *** paper investigates which representation reflects the functional organization of the metabolic system in the best way,according to the defined *** different graph representations of metabolism(three where the vertices are metabolites,one where the vertices are reactions)are evaluated using data from different organisms and *** graph representations are evaluated by comparing the overlap between clusters(network modules)and annotated functions,and also by comparing the set of identified currency metabolites with those that other authors have identified using qualitative biological *** is found that a"substance network",where all metabolites participating in a reaction are connected,is better than others,evaluated with respect to both the functional overlap between modules and functions and to the number and identity of the identified currency metabolites.

关键词：图形表示代谢物物质生物数据库反应体系化学反应系统顶点表示代谢产物

An Approach for Adaptive Limbless Locomotion Using a CPG-Based Reflex Mechanism

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Journal of Bionic Engineering 2014年第3期11卷 389-399页

作者： Guoyuan Li Houxiang Zhang Jianwei Zhang Hans petter Hildre Faculty of Maritime Technology and Operations Aalesund University College Aalesund 6009 Norway Department of Computer Science University of Hamburg Hamburg 22527 Germany

Animals＇ free movement in natural environments has attracted many researchers to explore control methods for bio-inspired robots. This paper presents a novel reflex mechanism based on a Central Pattern Generator （CPG） for adaptive locomotion of limbless robots. First, inspired by the concept of reflex arc, the reflex mechanism is designed on a connectionist CPG model. Since the CPG model inspired by the spinal cord of lampreys is developed at the neuron level, it provides a possible natural solution for sensory reflex integration. Therefore, sensory neurons that bridge the external stimuli and the CPG model, together with the concept of reflex arc, are utilized for designing the sensory reflex mechanism. Then, a border reflex and a body reflex are further developed and applied on the ends and the middle part of a limbless robot, respectively. Finally, a ball hitting scenario and a corridor passing scenario are designed to verify the proposed method. Results of simulations and on-site experiments show the feasibility and effectiveness of the reflex mechanism in realizing fast response and adaptive limbless locomotion.

关键词： sensory reflex mechanism reflex arc central pattern generator limbless locomotion

Climate change and land degradation in Africa: a case study in the Mount Elgon region, Uganda

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Geo-Spatial Information Science 2014年第1期17卷 39-53页

作者： Boyi JIANG Yazidhi BAMUTAZE petter PILESJO Department of Physical Geography and Ecosystem Science GIS CentreLund UniversityLundSweden Department of Geography Geo-Informatics and Climatic SciencesCollege of Agricultural and Environmental Sciences(MCAES)Makerere UniversityKampalaUganda

The aim of this study is to estimate and compare soil erosion,in the Mount Elgon region,eastern Uganda,during the last *** trends and changes in erosion are linked to precipitation/climate change as well as changes in land *** different versions of the Revised Universal Soil loss Equation(RUSLE)are implemented and compared,one using slope length and the other using flow accumulation to estimate the slope length and steepness factor(LS).Comparisons of the modeled soil erosion *** data indicate that RUSLE based on flow accumulation is *** modeling is carried out for the years 2000,2006,and 2012,and is based on ASTER remotely sensed data,digital elevation models,precipitation data from the study area,as well as existing soil *** significant trends in estimated soil erosion are found to be present during the last *** exploitation of land is probably compensated by improved agricultural management and no significant increase in *** if there are reports of more intense and increasing amounts of rainfall in the area,this could not be verified,neither through the analysis of climate data,nor by trends in the estimated soil loss.

关键词： soil erosion revised universal soil loss equation(RUSLE) ASTER Uganda climate change

Computational Aspects of Multiscale Simulationwith the Lumped Particle Framework

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Communications in Computational Physics 2012年第9期12卷 1257-1274页

作者： Omar al-Khayat Hans petter Langtangen Computational Geosciences CBCSimula Research LaboratoryP.O.Box 134NO-1325 LysakerNorway Department of Informatics University of OsloP.O.Box 1080BlindernNO-0316 OsloNorway Center for Biomedical Computing Simula Research LaboratoryP.O.Box 134NO-1325 LysakerNorway

First introduced in[2],the lumped particle framework is a flexible and numerically efficient framework for the modelling of particle transport in fluid *** this paper,the framework is expanded to simulate multicomponent particle-laden fluid *** is accomplished by introducing simulation protocols tomodel particles over a wide range of length and time ***,we present a time ordering scheme and an approximate approach for accelerating the computation of evolution of different particle constituents with large differences in physical *** apply the extended framework on the temporal evolution of three particle constituents in sandladen flow,and horizontal release of spherical ***,we evaluate the numerical error of the lumped particle *** this context,we discuss the Velocity-Verlet numerical scheme,and show how to apply this to solving Newton’s equations within the *** show that the increased accuracy of the Velocity-Verlet scheme is not lost when applied to the lumped particle framework.

关键词： Multiscale modelling lumped particle model Velocity-Verlet scheme

BUSINESS ENTERPRISES AND THE ENVIRONMENTAL INFORMATION ACT IN NORWAY

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Frontiers of Law in China-Selected Publications from Chinese Universities 2017年第1期12卷 3-23页

作者： Hans petter Graver University of Oslo Oslo Norway

Making market operators responsible for having and giving access to information about their impact on the environment is an important part of changing the way the economy operates in relation to environmental sustainability. To this end, the Norwegian access to environmental information act has established a right for the public to access to environmental information from private entities such as business enterprises. In this point, the Norwegian Act goes further than international rules, such as the Aarhus Convention, and also further than any other national legislation. This article presents the rules on access to information from business enterprises, and presents and discusses examples from the implementation of these rules.

关键词： Aarhus Convention access to information corporate social responsibility,environmental information responsible business

Particle Collisions in a Lumped Particle Model

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Communications in Computational Physics 2011年第9期10卷 823-843页

作者： Omar al-Khayat Are Magnus Bruaset Hans petter Langtangen Computational Geosciences CBCSimula Research LaboratoryP.O.Box 134NO-1325 LysakerNorway Department of Informatics University of OsloP.O.Box 1080BlindernNO-0316 OsloNorway Center for Biomedical Computing Simula Research LaboratoryP.O.Box 134NO-1325 LysakerNorway

This paper presents an extension of the lumped particle model in[1]to include the effects of particle *** lumped particle model is a flexible framework for the modeling of particle laden flows,that takes into account fundamental features,including advection,diffusion and dispersion of the *** this paper,we transform a binary collision model and concepts from kinetic theory into a collision procedure for the lumped particle *** apply this new collision procedure to investigate numerically the role of particle collisions in the hindered settling *** hindered settling effect is characterized by an increase in the effective drag coefficient CD that influences each particle in the *** coefficient is given by CD=(1−φ)−nC∗D,whereφis the volume fraction of particles,C∗D is the drag coefficient for a single particle,and n≃4.67 for creeping *** obtain an approximation for CD/C∗D by calculating the effective work done by collisions,and comparing that to the work done by the drag *** our numerical experiments,we observe a minimal value of n=***,by allowing high energy dissipation,an approximation for the classical value for creeping flow,n=4.7,is *** also obtain high values for n,up to n=6.5,which is consistent with recent physical experiments on the sedimentation of sand grains.

关键词： Lumped particle model particle collision hindered settling

A Lumped Particle Modeling Framework for Simulating Particle Transport in Fluids

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Communications in Computational Physics 2010年第6期8卷 115-142页

This paper presents a lumped particle model for simulating a large number of *** lumped particle model is a flexible framework in modeling particle flows,embodying fundamental features that are intrinsic in particle laden flow,including advection,diffusion and *** this paper,the particles obey a simplified version of the Bassinet-Boussinesq-Oseen equation for a single spherical ***,instead of tracking the individual dynamics of each particle,a weighted spatial averaging procedure is used where the external forces are applied to a“lump”of particles,from which an average position and velocity is *** temporal evolution of the particles is computed by partitioning the lumped particle into smaller entities,which are then transported throughout the physical *** smaller entities recombine into new particle lumps at their target *** particles prone to the effects of Brownian motion or similar phenomena,a symmetric spreading of the particles is included as *** experiments show that the lumped particle model reproduces the effects of Brownian diffusion and uniform particle transport by a fluid and *** late time scale diffusive nature of particle motion is also reproduced.

关键词： Particle modeling framework particle transport lumped particle model

SDI planning using the system dynamics technique within a community of practice:lessons learnt from Tanzania

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Geo-Spatial Information Science 2015年第2期18卷 97-110页

作者： Ali MANSOURIAN Alex LUBIDA petter PILESJÖ Ehsan ABDOLMAJIDI Monica LASSI GIS Center Department of Physical Geography and Ecosystem ScienceLund UniversitySölvegatan 1222362 LundSweden Department of Research and Study Services Lund University LibraryLund UniversityHelgonabacken 1Box 3SE-22100 LundSweden

There exist major challenges in accelerating the spatial data infrastructure(SDI)planning process in the developing countries as well as advocating for politicians to support the development of SDI,due to the high complexity of SDI,lack of knowledge and experience,and limited insight in the *** address these challenges,a methodology for SDI planning in Tanzania,based on the system dynamics technique and the communities of practice concept,was adopted and applied within a community consisting of experts from stakeholder *** groups gathered to develop an SDI plan,while they shared their knowledge and discussed their ideas that helped their understanding of *** running the system dynamics model,the development of SDI over time could be simulated that gave the planning community an insight about the future effects of today’s plans and ***,an optimum model could be developed by refinements and improvements done with the consensus of the SDI *** model included the components and policies that are essential for a successful SDI implementation in Tanzania and can be used as a basis for SDI planning and help to gain political *** learnt from this research were promising regarding the usability of the methodology for SDI planning in comparable countries.

关键词： spatial data infrastructure(SDI) planning system dynamics technique community of practice