An iterative algorithm for interactive multiobjective programming     

Shlomo P. Neuman  Roman Krzysztofowicz 《Advances in water resources》1977,1(1):1-14

A new iterative algorithm for interactive multiobjective programming is proposed. The algorithm is based on the Lagrange multiplier technique of generating noninferior solutions, and it is shown to converge under certain conditions. It reduces a complex multiobjective problem into a sequence of two-objective problems which the decision maker can handle more easily. The number of two-objective problems with which the decision maker is confronted, as well as the total number of noninferior solutions that must be generated, increase more or less linearly with the number of objectives. Computational efficiency is further enhanced by avoiding the need for regression. The decision maker interacts with the model directly in the functional space, and he is not required to translate his judgment of relative worth into numbers. Due to the iterative nature of the algorithm, the decision maker can articulate his preferences in a progressive manner. Furthermore, he may modify his attitude at any stage of the computation, based on partial results, without adversely affecting the quality of the solution. An example problem previously solved by other methods, including the surrogate worth trade-off approach, is used to illustrate the new algorithm.  相似文献   

Determination of Aquitard/Aquiclude Hydraulic Properties from Arbitrary Water-Level Fluctuations by Deconvolution   总被引：1，自引：0，他引：1  

Shlomo P. Neuman  David A. Gardner 《Ground water》1989,27(1):66-76

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Maximum likelihood Bayesian averaging of airflow models in unsaturated fractured tuff using Occam and variance windows     

Eric Morales-Casique  Shlomo P. Neuman  Velimir V. Vesselinov 《Stochastic Environmental Research and Risk Assessment (SERRA)》2010,24(6):863-880

We use log permeability and porosity data obtained from single-hole pneumatic packer tests in six boreholes drilled into unsaturated fractured tuff near Superior, Arizona, to postulate, calibrate and compare five alternative variogram models (exponential, exponential with linear drift, power, truncated power based on exponential modes, and truncated power based on Gaussian modes) of these parameters based on four model selection criteria (AIC, AICc, BIC and KIC). Relying primarily on KIC and cross-validation we select the first three of these variogram models and use them to parameterize log air permeability and porosity across the site via kriging in terms of their values at selected pilot points and at some single-hole measurement locations. For each of the three variogram models we estimate log air permeabilities and porosities at the pilot points by calibrating a finite volume pressure simulator against two cross-hole pressure data sets from sixteen boreholes at the site. The traditional Occam’s window approach in conjunction with AIC, AICc, BIC and KIC assigns a posterior probability of nearly 1 to the power model. A recently proposed variance window approach does the same when applied in conjunction with AIC, AICc, BIC but spreads the posterior probability more evenly among the three models when used in conjunction with KIC. We compare the abilities of individual models and MLBMA, based on both Occam and variance windows, to predict space–time pressure variations observed during two cross-hole tests other than those employed for calibration. Individual models with the largest posterior probabilities turned out to be the worst or second worst predictors of pressure in both validation cases. Some individual models predicted pressures more accurately than did MLBMA. MLBMA was far superior to any of the individual models in one validation test and second to last in the other validation test in terms of predictive coverage and log scores.  相似文献   

Polarization evolution in strong magnetic fields     

Jeremy S. Heyl  Nir J. Shaviv 《Monthly notices of the Royal Astronomical Society》2000,311(3):555-564

Extremely strong magnetic fields change the vacuum index of refraction. Although this polarization-dependent effect is small for typical neutron stars, it is large enough to decouple the polarization states of photons travelling within the field. The photon states evolve adiabatically and follow the changing magnetic field direction. The combination of a rotating magnetosphere and a frequency-dependent-state decoupling predicts polarization phase lags between different wavebands, if the emission process takes place well within the light cylinder. This QED effect may allow observations to distinguish between different pulsar-emission mechanisms and to reconstruct the structure of the magnetosphere.  相似文献   

Rate of sedimentation in Lake Kinneret,Israel: spatial and temporal variations     

Nir Koren  Micha Klein 《地球表面变化过程与地形》2000,25(8):895-904

The rate of sedimentation in Lake Kinneret was measured over several years by means of sediment traps, in up to seven different locations in the lake. Gross sedimentation rates measured in the sediment traps vary from about 1·5 kg m⁻² a⁻¹ in the deepest part of the lake up to 10 kg m⁻² a⁻¹ near the mouth of the upper Jordan river. The rate of sedimentation near the Jordan's inflow is highly correlated to flow discharge in the river, while in the centre of the lake the seasonal sedimentation pattern is mainly correlated to the bloom period of Peridinium gatunense. During the bloom period of Peridinium gatunense sedimentation rates all over the lake are very similar, indicating that the Peridinium is evenly distributed in the lake. The average suspended sediment discharge of the upper Jordan river flowing into the lake is 41 000 ton a⁻¹.Copyright © 2000 John Wiley & Sons, Ltd.  相似文献   

Nonlocal and localized analyses of nonreactive solute transport in bounded randomly heterogeneous porous media: Computational analysis     

Eric Morales-Casique  Shlomo P. Neuman  Alberto Guadagnini 《Advances in water resources》2006

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Territories and identities in Jerusalem     

Shlomo Hasson 《GeoJournal》2001,53(3):311-322

Jerusalem is a city of many contrasts. It is a historical-symbolic city, revered by Muslims, Christians and Jews. However, its citizens segregate ethno-nationally, culturally and socially, into different identity groups: Jews and Arabs, Haredi (`ultra-Orthodox') and secular Jews, and lower and upper class socio-economic groups. This essay focuses on how political and social struggles over territories reshape the nature of the identities of four distinct groups in Jerusalem. These are ethno-national groups (Israeli Jews and Palestinian Arabs), cultural groups (ultra-Orthodox Jews, in Hebrew Haredim (zealots), and non-Orthodox Jews), ethno-social groups (disadvantaged groups mainly of oriental descent, in Hebrew Mizrahim and advantaged groups) and economic and ecological groups (the business sector and inhabitants of private residential areas of the city). Thus, long-term historical processes have produced distinct ethno-national, cultural and social identity groups, which occupy specific territories within Jerusalem. The different groups have endowed their territory with dissimilar geopolitical, cultural, and economic meanings and played a major role in the reconstruction of national, cultural, social and ecological identities in the city. The city of Jerusalem is not only a spiritual centre associated with age-long dreams for peace and justice, it is also a violent city, rife with tensions and conflicts, a symbol of national, cultural, economic and ecological struggles. Perhaps the greatest challenge facing all those concerned about its future is whether Jerusalem's universal image of a spiritual, tolerant and just city can overcome its current, particularistic and conflict ridden image.  相似文献   

Evolution of clusters in dynamic point patterns: with a case study of Ants' simulation     

Maxim Shoshany  Asaf Even‐Paz  Shlomo Bekhor 《International journal of geographical information science》2013,27(7):777-797

Recent developments in sensing and tracking technologies have enabled large geographical databases to be established that represent spatial dynamics of ‘behavioral entities’. Within this type of dynamics there are several levels and modes of organization that need to be revealed. Clusters are high‐level groupings of entities, where change in their location and form, including split and merge events, represents self‐organization and functioning patterns. Such information may contribute for better understanding spatially complex dynamic patterns. The main objective of this article is to develop an adaptable methodology that facilitates exploration of spatial order and processes in point pattern dynamics. The approach presented here utilizes data‐clustering at each snapshot of the moving pattern, and then involves pairwise linking between the clusters identified at each snapshot and those identified in the following snapshot. Such linking is based on a new methodology that defines well globally optimized solutions for numerous possible linking combinations based on Linear Programming. A preliminary assessment of the approach was conducted with an existing Ants' simulation tool, capable of creating data sets covering in detail a substantial portion of the nest's life cycle.  相似文献   

Comment on ‘Siegel D. 2008. Reductionist hydrogeology: ten fundamental principles. Hydrological Processes 22: 4967– 4970’     

Shlomo P. Neuman 《水文研究》2009,23(11):1676-1677

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Can non-linear structure form at the era of decoupling?     

Nir J. Shaviv 《Monthly notices of the Royal Astronomical Society》1998,297(4):1245-1260

The effects of large-scale fluctuations on small-scale isothermal modes at the epoch of recombination are analysed. We find the following. (a) Albeit the fact that primordial fluctuations were at this epoch still well in the linear regime, a significant non-linear radiation hydrodynamic interaction could have taken place. (b) Short-wavelength isothermal fluctuations are unstable. Their growth rate is an exponential function of the amplitude of the large-scale fluctuations and is therefore very sensitive to the initial conditions. (c) The observed cosmic microwave background radiation (CMBR) fluctuations are of order of the limit above which the effect should be significant. Thus, depending on their exact value, the effect may be negligible or lead to structure formation out of the isothermal fluctuations within the period of recombination. (d) If the cosmological parameters are within the prescribed regime, the effect should be detectable through induced deviations in the Planck spectrum. (e) The sensitivity of the effect to the initial conditions provides a tool to set limits on various cosmological parameters with emphasis on the type and amplitude of the primordial fluctuation spectrum. (f) Under proper conditions, the effect may be responsible for the formation of sub-globular-cluster sized objects at particularly high redshifts. (g) Under certain circumstances, it can also affect horizon-sized large-scale structure.  相似文献