Facility Location with Changing Demand Levels

The paper identifies six strategies that may be considered by a planner in the location of public facilities over time. All the strategies share the common goal of producing the optimal locational arrangement at the end of a specified planning period, where optimality is defined in terms of cost minimization. However, the paths taken by each toward the optimal arrangement differ markedly. The analysis focuses on two main questions. The first is a comparison at any given point in time of the demand levels that result from implementing the various strategies. The second is a consideration of the relative costs involved in instituting two of the strategies. The appendix supplies the proofs of the main theorems derived for the demand level comparisons.     

AN ALGORITHM FOR THE SPATIAL PRICE EQUILIBRIUM PROBLEM ON A GENERAL NETWORK IN THE SPACE OF THE PATH FLOWS*

ABSTRACT. The spatial price equilibrium on a general network may be formulated as a nonlinear-cost mathematical programming problem with simple constraints, when the decision variables are the path flows. The solution of this problem is difficult due to the very large number of variables (paths) and the impracticality of generating all the paths from all the origins to all the destinations. In this paper, we develop a Gauss-Seidel-Newton Projection algorithm and combine it with a restriction strategy. That makes it unnecessary to generate a priori all the paths. This algorithm may be further improved by exploiting the equivalence between the spatial price equilibrium on a general network and the network equilibrium. Computational results that we present in this paper demonstrate the efficiency of the proposed solution algorithms.     

Favelas and the divided city: mapping silences and calculations in Rio de Janeiro's journalistic cartography

This article aims to challenge the widespread consensus that Rio de Janeiro is a divided city by deploying two concepts in critical cartography: cartographic silences and cartographic calculations. As a kind of unconquered territory, a terrae incognitae, favelas were silenced on many of Rio de Janerio's maps over the last century. When these places began to be mapped, and converted to terrae cognitae, power relations often become even more apparent because of the intention to make it legible for purposes of intervention. By analyzing maps published in the mainstream Brazilian press throughout the last century, this article explores how national press often portrays Rio de Janeiro as a city divided between formal neighborhoods, where the state apparatus can ensure the rule of law, and favelas, where parallel politics enforce local forms of governance. In order to disseminate this image of the city, maps can play an important role, locating different urban zones and reinforcing old stereotypes. Despite many studies that focused on both material and embodied forms of state presence within favelas, maps can be an important source of information to understand persistant representations of favelas as excluded and divided places.     

Out-of-Plane Seismic Response of Unreinforced Masonry Walls: Conceptual Discussion,Research Needs,and Modeling Issues

ABSTRACT

Modeling unreinforced masonry walls, subjected to seismic loads applied normal to their plane, has received much attention in the past. Yet, there is a general lack of conformance with regard to what aspects of seismic response a computational model should reflect. Boundary conditions are certainly an important aspect, as the response can involve two-way bending or just one-way bending and, in the second case, along vertical or horizontal directions. In this respect, flexural restraint of wall intersections can be significant in addition to size and placement of openings. Moreover, in-plane damage can modify the boundary conditions and the overall out-of-plane performance. Proper modeling of actions is also relevant, as they can be a result of distortions imposed upon wall elements and/or inertial forces along the span of a wall. Axial forces can markedly affect the out-of-plane response of the wall, particularly vertical compressive forces, which can enhance out-of-plane strength. The outcome of static verifications can be more conservative than that of dynamic analyses, but the latter are much more complex to carry out. These topics are discussed with reference to previous research, observations in the field and in the laboratory, as well as numerical analyses on three-dimensional models.     

Intergroup Dialogue as a Just Dialogue: Challenging and Preventing Normalization in Campus Dialogues

The tensions from the Israeli occupation of Palestine reach around the globe and heated debates over the struggles of these two peoples are evident on U.S. college campuses. The power imbalance represented in the relationship between Palestinians and Israelis is replicated on college campuses. BDS (Boycott, Divestment, and Sanctions) is a response to this inequality, is a movement to end the occupation, and has raised the issue of normalization. Teaching about this conflict presents particular challenges for faculty who negotiate this highly contested issue in classrooms or campus communities, and intergroup dialogue is an important pedagogy that can be used. It is critical to address normalization in intergroup dialogue. We discuss examples and themes of normalization in intergroup dialogue, and present pedagogical and other strategies to prevent and address normalization in intergroup dialogue and in other similar intergroup contact approaches with Arab or Palestinian and Jewish or Israeli participants.     

Entropy vs. human ontogeny: the Shannon information measure; a reliable general indicator of human health?

ABSTRACT

A measure of health based on exact sciences is not considered by social sciences to evaluate human development. We propose the H measure of information of Shannon ([1948]. “A Mathematical Theory of Communication.” The Bell Systems Technical Journal 27 (3): 379–423, 623–656), renamed as H _cto , as a general indicator of human health which can be subsequently aggregated at any statistical level. Several advantages of H _cto are explained: (i) connections with thermodynamics and information theory; (ii) combination of physical and statistical elements; (iii) measurements of entropy and/or information depending on the reference point, and (iv) a collection of examples based on the scientific literature that supports the application of H _cto . Simplified graphical models of the ontogeny of health condition are also shown. The empirical feasibility of using H _cto is also analysed, by concluding that it could be a tangible reality in the near future.