Location Modeling Utilizing Maximum Service Distance Criteria

The location set-covering problem (LSCP) and the maximal covering location problem (MCLP) have been the subject of considerable interest. As originally defined, both problems allowed facility placement only at nodes. This paper deals with both problems for the case when facility placement is allowed anywhere on the network. Two theorems are presented that show that when facility placement is unrestricted, for either the LSCP or MCLP at least one optimal solution exists that is composed entirely of points belonging to a finite set of points called the network intersect point set (NIPS). Optimal solution approaches to the unrestricted site LSCP and MCLP problems that utilize the NIPS and previously developed solution methodologies are presented. Example solutions show that considerable improvement in the amount of coverage or the number of facilities needed to insure total coverage can be achieved by allowing facility placement along arcs of the network. In addition, extensions to the arc-covering model and the ambulance-hospital model of ReVelle, Toregas, and Falkson are developed and solved.     

BOOK REVIEWS

Book Reviews in This Article: Al-Quran Rendered into English. By Syed Abdul Latif. The Message of the Qur'an Presented in Perspective. By Hashim Amir-Ali. Ibn Kammn?a's Examination of the Three Faiths: A Thirteenth-Century Essay in the Comparative Study of Religion. Translated from the Arabic, with an Introduction and Notes, by Moshe Perlman. Arab Civilization to A.D. 1500. By D. M. Dunlop. The Baha'i Faith: Its History and Teachings. By William McElwee Miller. Jeunesse, Famille et Développement: Essai sur le changement socio-culturel dans un pays du Tiers Monde (Tunisie). By Carmel Camilleri. Jabal al-Akhdar, Cyrenaica: An Historical Geography of Settlement and Livelihood. By Douglas L. Johnson. Is Western Civilization Universal? By Maryam Jameelah. Syria under the Ba'th, 1963-1966: The Army-Party Symbiosis. By Itamar Rabinovich. Politics and Change in Al-Karak, Jordan. By Peter Gubser. Man, State, and Society in the Contemporary Middle East. Edited by Jacob M. Landau.     

BOOK REVIEWS

Book Reviews in This Article:
Der Koran. Ed. by Rudi Paret.
Introduction to Classical Arabic Literature. By Ilse Lichtenstadter.
On the Art of Medieval Arabic Literature. By Andras Hamori.
Four Egyptian Literary Critics. By David Semah.
Hispano-Arabic Strophlc Poetry. Studies by Samuel Miklos Stern.
The Hamadsha: A Study in Moroccan Ethnopsychiatry. By Vincent Crapanzano.
Publish it not… The Middle East Cover-up. By Christopher Mayhew and Michael Adams.
From Ottomanism to Arabism: Essays on the Origins of Arab Nationalism. By C. Ernest Dawn.
An Inquiry into the Ethnography of Afghanistan. By Henry W. Bellew.     

Making waves: the valuation of innovations in San Sebastian’s surf economy

This study takes a valuation perspective to study how and where products and innovations are gaining ‘economic significance’ in the contemporary economy. Building on a recent research stream in economic geography and urban and regional studies, it highlights that the economic value of many products is not formed within production systems alone, but relies on co-constructed connections between production and consumption systems, playing out across multiple geographies. It distinguishes between three types of economic valuation pathways – namely technical, experiential and identity-based – which although analytically distinct may actually build and reinforce one another. This approach is empirically illustrated with the case of the surf-related economy in the city of San Sebastian (Basque Country, Spain), which is used to make a broader point about the growing relevance of a valuation approach to understand competitive advantage and economic renewal in localized production systems.     

The Authenticity of Spatial Planning Knowledge

This article intends to start a debate on the authentic disciplinary grounds of spatial planning studies as a scientific discipline of spatial intervention closely interrelated with practices of spatial development. In a volatile epoch of regrouping academic specializations, scientists feel a strong incentive to reflect on the authentic grounds of their discipline. This certainly goes for spatial planning studies that heavily rely on intensive interaction with a wide range of disciplines. What justifies its own position? Spatial planning studies are intensely interrelated with practices of planning, which demarcates its scientific position in a specific way. The author does not claim an exclusive position for spatial planning studies (the diversity of external relations and alliances enriches the field of study) but defines the authentic identity of the spatial planning discipline in the conceptual coherence of five dimensions: practical context, spatial norms, knowledge and action, to be validated in new contexts of practice. The author states that different planning paradigms interconnect the five dimensions in their own way and in doing so innovate the authentic body of planning knowledge. To invest in this authenticity is crucial in this era of organizational proliferation.     

A Family of Location Models for Multiple-Type Discrete Dispersion

One of the defining objectives in location science is to maximize dispersion. Facilities can be dispersed for a wide variety of purposes, including attempts to optimize competitive market advantage, disperse negative impacts, and optimize security. With one exception, all of the extant dispersion models consider only one type of facility, and ignore problems where multiple types of facilities must be located. We provide examples where multiple-type dispersion is appropriate and based on this develop a general class of facility location problems that optimize multiple-type dispersion. This family of models expands on the previously formulated definitions of dispersion for single types of facilities, by allowing the interactions among different types of facilities to determine the extent to which they will be spatially dispersed. We provide a set of integer-linear programming formulations for the principal models of this class and suggest a methodology for intelligent constraint elimination. We also present results of solving a range of multiple-type dispersion problems optimally and demonstrate that only the smallest versions of such problems can be solved in a reasonable amount of computer time using general-purpose optimization software. We conclude that the family of multiple-type dispersion models provides a more comprehensive, flexible, and realistic framework for locating facilities where weighted distances should be maximized, when compared with the special case of locating only a single type of facility.