OBNOXIOUS FACILITY LOCATION IN THE INTERIOR OF A PLANAR NETWORK*

ABSTRACT. The problem of locating a point that is as far as possible from arcs and nodes of a network is investigated. Each arc or node may have a different multiplicative factor (weight) for its distance. A graphical solution approach, as well as a computational algorithm, is presented.     

Memories of Kings of Israel and Judah within the Mnemonic Landscape of the Literati of the Late Persian/Early Hellenistic Period: Exploratory Considerations

This article explores, from a perspective informed by Social Memory studies, memories of kings of Judah (/Israel) in three different corpora (the Deuteronomistic Historical Collection, the Prophetic Book Collection and Chronicles). It draws attention to the interdependence between memories of kings and other characters populating the world of memory evoked by each of these corpora and explores the ways in which the worlds of memory evoked by each of them interacted, informed and balanced each other within what we may call the “comprehensive mnemonic system” of the literati. The article sheds light on generative grammars governing systems of preferences and dis-preferences for certain types of memories of kings in each of the corpora and across them, and at times, even across cultures, and highlights that the world of memory of the Yehudite literati of the late Persian/early Hellenistic period was shaped by a consistency of inconsistency, and an overall coherence manifested through a seeming lack thereof that served well the social reproduction of the group.     

RECENT DEMOGRAPHIC AND MIGRATORY TRENDS AMONG SOVIET JEWS: IMPLICATIONS FOR POLICY

A prominent authority on the Jewish population of the former USSR focuses on demographic trends and migration behavior (both within the former USSR and abroad), while also addressing the effect of Soviet state policy toward the Jewish population. Among the factors whose effects on population dynamics are examined, emphasis is placed on the Jewish population's concentration in large urban areas, the effects of emigration on age structure of the remaining population, self-identification as a method in census enumeration, ethnic intermarriage and family characteristics, and the outlook and prospects for emigres in Israel and the United States.     

Evaluating Crash Risk in Urban Areas Based on Vehicle and Pedestrian Modeling

This article presents a method for investigating the spatial distribution of vehicle and pedestrian traffic crashes relative to the volume of vehicle and pedestrian movement in urban areas. This method consists of two phases. First, vehicle and pedestrian traffic volumes on the street network are modeled using a space syntax configurational analysis of the network, land use data, and observed traffic data. Second, crash prediction models are fitted to the traffic crash data, using negative binomial regression models and based on traffic volume estimates and street segment lengths. The method was applied in two areas in Tel Aviv, Israel, which differ in their morphological and traffic characteristics. The case‐studies illustrated the method's capability in identifying hazardous locations on the network and examining relative crash risks. The analysis shows that an increase in vehicle or pedestrian traffic volume tends to be associated with a decrease in relative crash risk. Moreover, the spatial patterns of relative crash risks are associated with the design characteristics of urban space: areas characterized by dense street networks encourage more walking, and are generally safer for pedestrians, while those with longer street segments encourage more driving, are less safe for pedestrians, but safer for vehicles.     

A Note on Applying the Gravity Rule to the Airline Hub Problem

In this note we propose a new model for the airline hub selection problem. Passengers use a hub on the way to their destination. We apply the objective of minimizing the total miles traveled by passengers. This formulation can be used as the basis for other objectives also.     

A Threshold-Satisfying Competitive Location Model

In this paper we consider a location model based on the threshold concept. We find the best location such that the probability of revenue falling short of the threshold is minimized. This objective is appropriate when a firm will not survive if its revenue falls below a known threshold. A new store is to be located. Demand is not deterministic but rather has a statistical distribution. We seek the location at which the probability that the revenue (expressed as market share attracted by the new store) is below a given threshold is minimized. The model is formulated and solved, and computational results are given.     

The Maximal Covering Problem with Some Negative Weights

This article presents the maximal covering problem on a network when some of the weights can be negative. Integer programming formulations are proposed and tested with ILOG CPLEX. Heuristic algorithms, an ascent algorithm, and simulated annealing are proposed and tested. The simulated annealing approach provides the best results for a data set comprising 40 problems.