Ordovician trilobite faunas and depositional history of the Taebaeksan Basin,Korea: implications for palaeogeography

The Taebaeksan Basin occupies the central-eastern part of the Korean peninsula and was a low-relief shallow marine carbonate shelf on which the Cambro-Ordovician Choson Supergroup was deposited. In the Taebaeksan Basin trilobites are among the most dominant fossil groups in the Lower Ordovician, but they become less important in Middle Ordovician faunal assemblages. The Early Ordovician trilobite faunas of the Taebaeksan Basin are characterised by the common occurrence of pandemic genera such as Jujuyaspis, Leiostegium, Asaphellus, Protopliomerops, Hystricurus, Apatokephalus, Shumardia, Asaphopsoides, and Kayseraspis. Biogeographically significant trilobite taxa include Yosimuraspis, Dikelokephalina, Koraipsis, and Chosenia. These Ordovician trilobite faunas, which thrived in shallow marine environments, show a remarkable similarity with faunas from North China, implying that the Taebaeksan Basin was connected through contiguous shallow waters to North China. These Sino-Korean faunas exhibit a close biogeographic connection with Australian faunas, with which they share some endemic genera, whereas they are more distantly related to the faunas of South China, South America, and North America. Based on these palaeobiogeographical features, it is suggested that in the early Palaeozoic much of the present Korean peninsula including the Taebaeksan Basin belonged to the Sino-Korean block, while part of the peninsula was derived from the Yangtze block.     

South Korea's Meandering Path to Globalisation in the Late Twentieth Century

Globalisation, or segyehwa1 1. The system of romanisation for the South Korean language that is used in this article is the revised system proclaimed by the South Korean Ministry of Culture and Tourism in July 2000. Exceptions to the revised system are proper nouns – e.g. the names of the former presidents of South Korea and of jaebeol (chaebol) groups such as Samsung, Hyundai, Daewoo and Sunkyung. View all notes in Korean, has recently been the central theme in discussions of South Korean political economy, particularly in strategic policy-making discourses since the outbreak of the Asian financial crisis, which was triggered by the collapse of the Thai baht in 1997. The serious nature of the South Korean currency meltdown in 1997 resulted at first glance in a striking transition in the South Korean political economy from state-driven market and industrial policies, and a strong nationalist policy towards foreign capital (inflow of foreign direct investment), to a neo-liberal policy of globalisation. This article critically examines the paradoxical nature of Korea's globalisation efforts under three political regimes (February 1993–February 2008), as a response to new economic conditions embedded in the nature of developmental capitalism. The paper argues that South Korea's globalisation effort over the period has been highly pragmatic and selective in policy and regulations but has resisted embracing the principles of market-driven globalisation. South Korea's globalisation drive or segyehwa therefore appears only a temporary phenomenon rather than a carefully structured strategic policy.     

Reliable p-Hub Location Problems in Telecommunication Networks

Hubs are critical elements of telecommunication and transportation networks because they play a vital role in mass traffic movement. The design of more reliable networks in hub-and-spoke systems is a critical issue because current networks, particularly many commercial Internet backbones, are quite vulnerable. In hub-and-spoke-type topologies, any malfunction at a hub may cause degradation of the entire network's ability to transfer flows. This article presents a new hub location problem, termed the reliable p-hub location problem , which focuses on maximizing network performance in terms of reliability by locating hubs for delivering flows among city nodes. Two submodels, the p-hub maximum reliability model and the p-hub mandatory dispersion model, are formulated. Based on hypothetical and empirical analyses using telecommunication networks in the United States, the relationship between network performance and hub facility locations is explored. The results from these models could give useful insights into telecommunication network design.     

Pathways to Social Complexity and State Formation in the Southern Zambezian Region

Theorists have put forth various anthropological perspectives on the variables leading to social complexity and the emergence of state-level polities. This paper incorporates data from the Zambezian region of Southern Africa in order to contribute to the literature on social evolutionary theory. It traces the cultural trajectories of communities that flourished during the region’s Iron Age within the Shashi-Limpopo Basin, leading to the emergence of the Great Zimbabwe polity. In examining the archaeological record, the authors discuss the emergence of state-like societies, offering a review of current interpretations and explanations for the emergent complexity. Les théoriciens ont émis plusieurs points de vue anthropologiques sur les variables qui conduisent à la complexité sociale et à l’émergence des états. Cet article est une contribution à la littérature sur la théorie de l’évolution des sociétés réalisée à partir des données de la région du Zambèze au sud de l’Afrique. Il retrace les trajectoires culturelles de communautés qui sont apparues au cours de l’age du fer dans le Bassin du Shashi-Limpopo et qui ont conduit à l’émergence de l’état du Grand Zimbabwe. En s’appuyant sur les données archéologiques, les auteurs discutent l’émergence de sociétés-états, offrant une revue des dernières interprétations et explications au sujet des complexités émergentes.     

Modeling Micro-Spatial Employment Location Patterns: A Comparison of Count and Choice Approaches

This article studies employment location patterns in the Puget Sound Region of Washington State at a micro level of geography. Traditional discrete choice modeling using multinomial logit (MNL) models may be problematic at a micro level of geography due to the high dimensionality of the set of alternative locations and the likely violations of the independence from irrelevant alternatives (IIA) assumption. Count models are free from the IIA assumption and, unlike logit models, actually benefit from large numbers of alternatives by adding degrees of freedom. This study identifies the best-fitting count model as the zero-inflated negative binomial (ZINB) model, because this model more effectively addresses the large number of cells with no jobs and reflects a dual process that facilitates the identification of threshold clustering effects such as those found in specialized employment centers. The estimation and prediction results of ZINB are compared with those of MNL with a random sampling of alternatives estimated on an equivalent data set. The ZINB and MNL models largely agree on major trends, with the ZINB model providing more insightful details, but with less capacity to predict large count situations.     

ENHANCING SPATIAL REPRESENTATION IN PRIMARY AND SECONDARY COVERAGE LOCATION MODELING*

ABSTRACT An important goal in many planning contexts is maximizing primary and secondary (or backup) coverage while locating a specified number of service facilities. In general, we are interested in providing the greatest level of coverage to demand that is continuously distributed across space. A critical issue is how to represent continuous demand in coverage analysis, reducing or eliminating error and uncertainty. This paper evaluates representation issues in primary and secondary coverage location modeling. To overcome representational limitations, enhancements for spatial coverage abstraction are introduced and incorporated in a mathematical optimization model. In addition to model improvements, this paper introduces a new and novel error assessment approach arising due to the existence of multiple objectives. Surveillance sensor siting in an urban area is utilized to assess enhanced modeling capabilities.     

Resource‐Constrained Export‐Base Regional Multipliers: A Northian Approach*

Abstract. This paper attempts to rescue the regional export‐base growth model from a purely demand‐side interpretation. It formally develops the classic Northian approach, where the exploitation of region‐specific resources by export‐orientated production sectors determines regional growth. In this model, the nature of the regional expansion is shown to be stimulus‐specific with the value of the marginal export‐base multiplier varying within very wide limits, depending upon key characteristics of the region and the nature of the supply‐side shock to the export base.