A Minha Senhora da Saúde: O Processo de apropriaçâo individual da Senhora da Saúde de Touvedo (2009)
La Verge Maria es manifesta de diverses formes, resentant innombrables designacions, essent una d’elles Senyora de la Salut. Tanmateix, aquesta Senyora de la Salut també es materialitza de manera...
Pedro Pereira, Jel Classification D
“The explosive growth of the Internet promises a new age of perfectly competitive markets. With perfect information about prices and products at their fingertips, consumers can quickly and easily...
Abstract ODAC: Hierarchical Clustering of Time Series Data Streams ∗ (2008)
Pedro Pereira, Rodrigues João, Gama João, Pedro Pedroso
This paper presents a time series whole clustering system that incrementally constructs a tree-like hierarchy of clusters, using a top-down strategy. The Online Divisive-Agglomerative Clustering...
Abstract ODAC: Hierarchical Clustering of Time Series Data Streams ∗ (2008)
Pedro Pereira, Rodrigues João, Gama João, Pedro Pedroso
This paper presents a time series whole clustering system that incrementally constructs a tree-like hierarchy of clusters, using a top-down strategy. The Online Divisive-Agglomerative Clustering...
Plugging Computer Labs to the Grid (2008)
Pedro Ribeiro, Pedro Pereira, Luís Lopes, O Silva
Abstract. We present an architecture that allows the seamless configuration of computer labs to work as dedicated computing clusters during periods of user inactivity. The operation of the cluster is...
Fast Discovery of Statistically Interesting Words (2008)
Pedro Pereira, Nuno A. Fonseca, O Silva, Pedro Pereira, Nuno A. Fonseca, ...
Abstract. In biological sequences, statistically interesting words can lead us to detect subsequences that have a relevant functional significance (e.g. subsequences preserved through evolution or...
Fast Discovery of Statistically Interesting Words (2008)
Pedro Pereira, Nuno A. Fonseca, O Silva
& Laborat'orio de Intelig^encia Artificial e Ci^encia de Computadores
A High Performance Distributed Tool for Mining Patterns in Biological Sequences (2008)
Pedro Pereira, Nuno A. Fonseca, O Silva, Pedro Pereira, Nuno A. Fonseca, ...
The identification of interesting patterns (or subsequences) in biosequences has an important role in computational biology. Databases of genomic and proteomic sequences have grown exponentially, and...
Departamento de Ci^encia de Computadores (2008)
Pedro Pereira, Nuno A. Fonseca, O Silva
& Laborat'orio de Intelig^encia Artificial e Ci^encia de Computadores Faculdade de Ci^encias da Universidade do PortoRua do Campo Alegre, 1021/1055,
A Generic DRM Framework for J2ME Applications (2008)
Recently, a new generation of mobile phones with support for Java has been taking widespread acceptance by the market, creating a business potential for downloadable Java Games and enterprise...
Entry, Costs Reduction, and Competition in the Portuguese Mobile Telephony Industry (2007)
Gagnepain, Philippe [philippe], Pereira, Pedro
We study the effect of entry on costs and competition in the Portuguese mobile telephony industry. We construct and estimate a model that includes demand, network, and cost equations. The latter...
Entry, Costs Reduction, and Competition in the Portuguese Telephony Industry (2006)
Gagnepain, Philippe [philippe], Pereira, Pedro
We study the e¤ect of entry on costs and competition in the Portuguese mobile telephony industry. We construct and estimate a model that includes demand, network, and cost equations. The latter...
Nikolaos Georgantzís, Pedro Pereira
We analyze the impact on consumer prices of the size and bias of price comparison search engines. In the context of a model related to Burdett and Judd (1983) and Varian (1980), we develop and test...
Nikolaos Georgantzís, Pedro Pereira, Autoridade Da Concorrência, Nikolaos Georgantzís, Pedro Pereira
, is a non-profit institution devoted to research on network industries, electronic commerce, telecommunications, the Internet, “virtual networks” comprised of computers that share the same...
Patterns of Diffusion of Electronic Commerce in Retail Industries: Theory and Evidence (2005)
Dinlersoz, Emin M., Pereira, Pedro
This paper puts into perspective the early patterns of retailers' adoption of e-commerce across product categories and firm types. The focus is on understanding how consumer loyalty, differences in...
Aurora García-gallego, Nikolaos Georgantzís, Pedro Pereira, Nikolaos Georgantzís, Pedro Pereira, ...
, is a non-profit institution devoted to research on network industries, electronic commerce, telecommunications, the Internet, “virtual networks” comprised of computers that share the same...
Electronic commerce, consumer search and retailing cost reduction (2001)
Mazón, Cristina, Pereira, Pedro
This paper explains three things in a unified way. First, how e-commerce can generate price equilibria, where physical shops either compete with virtual shops for consumers with Internet access, or...
Price dynamics and shake-outs in electronic markets (2001)
This paper presents a model that explains the recent evolution of e-commerce, where over time, prices can increase if no exit occurs, or decrease, if exit occurs. In the model there is uncertainty...
Electronic Commerce, Consumer Search and Retailing Cost Reduction (2001)
Pereira, Pedro, Mazón, Cristina
This paper explains four things in a unified way. First, how e-commerce can generate price equilibria where physical shops either compete with virtual shops for consumers with Internet access, or...
Electronic commerce, consumer search and retailing cost reduction (2001)
Mazón, Cristina, Pereira, Pedro
This paper explains four things in a unified way. First, how e-commerce can generate price equilibria, where physical shops either compete with virtual shops for consumers with Internet access, or...
Mazón Calpena, Cristina, Pereira, Pedro
El trabajo considera el impacto que la aparición del comercio electrónico como nueva tecnología de distribución ha tenido en los precios de los mercado minorista. En primer lugar, repasamos la...
"Electronic commerce, consumer search and retailing cost reduction " (2001)
Mazón Calpena, Cristina, Pereira, Pedro
This paper explains three things in a unified way. First, how e-commerce can generate price equilibria, where physical shops either compete with virtual shops for consumers with Internet access, or...
"Price dynamics and shake-outs in electronic markets" (2001)
This paper presents a model that explains the recent evolution of e-commerce, where over time, prices can increase if no exit occurs, or decrease, if exit occurs. In the model there is uncertainty...
ELECTRONIC COMMERCE, CONSUMER SEARCH AND RETAILING COST REDUCTION (2001)
_________________________________________________________________________ This paper explains four things in a unified way. First, how e-commerce can generate price equilibria, where physical shops...
Miguel Costa-gomes, Klaus G. Zauner, Oscar Jorda, Muriel Niederle, Pedro Pereira, Georg Weizsacker
We thank Alvin Roth for providing us with the data sets of the Roth, Prasnikar, Okuno-Fujiwara, and Zamir (1991) ultimatum game experiments. We arevery grateful to Vincent Crawford, Joel Sobel, and...
F.: J.AgentX: a Tool for Dynamic Deployment of Open Management Services (2000)
Paulo Simões, Eduardo Lourenço, Pedro Pereira, Luís Silva, O Boavida
Abstract. This paper presents J.AgentX, a Java-based toolkit for dynamic extension of SNMP agents. This public-domain toolkit provides an easy way to dynamically supply SNMP-based interfaces to new...
Three essays on cost reducing investment / (1998)
Thesis(Ph.D.)--University of California, San Diego, 1997
Mazzei Rivas, Milton, Pereira, Pedro
Mecanografiado Tesis (Ing. Químico) -- Universidad de Los Andes, Facultad de Ingeniería, Escuela de Ingeniería Química, Mérida, 1985 Incluye bibliografía
Some implications of search and switching costs for the price dynamics of electronic markets
This article develops a model, based on switching costs and technological uncertainty, which explains some aspects of the price dynamics of e-commerce. Switching costs and intertemporal cost...
Ownership Structure of Cable Networks and Competition in Local Access
In this paper, we discuss the role of cable television networks and their ownership structure in promoting competition in the local access market. First, we show that the dual ownership of a local...
Some Investment and Competition Implications of the Ownership Structure of Overlapping Networks
In this article we discuss the role of cable television networks and their ownership structure, in promoting competition in the local access market. An upgraded cable network can o¤er...
Ownership Structure of Cable Networks and Competition in Local Access
In this paper, we discuss the role of cable television networks and their ownership structure in promoting competition in the local access market. First, we show that the dual ownership of a local...
The Diffusion of Cellular Telephony in Portugal before UMTS: A Time Series Approach
In this paper, we propose a methodology to estimate diffusion processes that differs from the standard practice in two ways. First, we model the nonlinear long-run trend through the Richards curve,...
Entry, Costs Reduction, and Competition in the Portuguese Telephony Industry
Philippe Gagnepain, Pedro Pereira
Mobile Telephony, Entry, Competition, Efficiency, Empirical Analysis
Do Lower Search Costs Reduce Prices and Price Dispersion?
This paper presents a search model, for which a decrease in the search cost may lead to lower prices and to a lower price variance, but may also lead to the opposite. This result contrasts with some...
Multiplicity of Equilibria in Search Markets with Free Entry and Exit
In this paper I identify an instance of multiplicity of equilibria, in search markets with production cost heterogeneity. I show that if firms may enter or exit the market, there may be multiple...
Some Implications of Search Costs for the Price Dynamics of Electronic Markets
This paper develops a model based on switching costs and technological uncertainty, which explains some aspects of the price dynamics of e-commerce. Switching costs and intertemporal cost correlation...
The Impact on Broadband Access to the Internet of the Dual Ownership of Telephone and Cable Networks
In Portugal, the telecommunications incumbent o®ers broadband access to the Inter- net, both through digital subscriber line and cable modem. In this article, we estimate the impact on broadband...
Crystal structure of the human α-thrombin–haemadin complex: an exosite II-binding inhibitor
Richardson, John L., Kröger, Burkhard, Hoeffken, Wolfgang, Sadler, J.Evan, Pereira, Pedro, Huber, Robert, ...
The serine proteinase α-thrombin plays a pivotal role in the regulation of blood fluidity, and therefore constitutes a primary target in the treatment of various haemostatic disorders. Haemadin is a...
Product Differentiation when Competing with the Suppliers of Bottleneck Inputs
In this article, we analyze the product differentiation decision of a downstream entrant that purchases access to a bottleneck input from one of two vertically integrated incumbents, who will compete...
The Consumer Loss of the Minimum Duration for Mobile Telephone Calls
Lukasz Grzybowski, Pedro Pereira
We estimate, for Portugal, the monetary loss per consumer of the existence of a minimum duration for mobile telephone calls. First, we estimate the demand for durations of calls, using individual...
The Complementarity between Calls and Messages in Mobile Telephony
Lukasz Grzybowski, Pedro Pereira
This article estimates the price elasticities of the demand for mobile telephone calls and the demand for messages for Portugal. We use a panel of individual level data. In order to account for the...
Electronic commerce, consumer search and reailing cost reduction
This paper explains four things in a unified way. First, how e-commerce can generate price equilibria, where physical shops either compete with virtual shops for consumers with Internet access, or...
Access to Bottleneck Inputs under Oligopoly: a Prisoners Dilemma?
In this article, we analyze the incentives of vertically integrated oligopolists to concede access to their bottleneck inputs to an entrant in the downstream retail market. We develop a two-stage...
On the Diffusion of Electronic Commerce
Emin M. Dinlersoz, Pedro Pereira
This paper analyzes retailers’ adoption of e-commerce in a technology adoption race framework. An Internet-based firm with no traditional market presence competes with an established traditional...
Mobile Virtual Network Operators: Beyond the Hyperbolae
In this article, we discuss several aspects related to the entry of mobile virtual network operators. Some aspects, such as entry barriers and exclusionary practices, relate to the entry process...
The Impact on Broadband Access to the Internet of the Dual Ownership of Telephone and Cable Networks
Broadband, Structural Separation, Prices
Bias and Size Effects of Price-Comparison Search Engines: Theory and Experimental Evidence
Aurora García-Gallego, Nikolaos Georgantzís, Pedro Pereira
This article, analyzes the impact on consumer prices of the size and bias of price comparison search engines. we develop a model, related to Burdett and Judd (1983) and Varian (1980), and test...
The Welfare Impact of Competition in Fixed Telephony
Toker Doganoglu, Pedro Pereira
In Portugal, fixed telephony was liberalized in 2000. In this article, we estimate the impact on prices and consumer welfare of the liberalization process. We use a panel of household level data to...
Merger Simulation in Mobile Telephony in Portugal
Lukasz Grzybowski, Pedro Pereira
Lock-in, Merger simulation, Mobile telephony, Nested logit, Network effects, L13, L43, L93,
ELECTRONIC COMMERCE, CONSUMER SEARCH AND RETAILING COST REDUCTION
This paper explains three things in a unified way. First, how e-commerce can generate price equilibria, where physical shops either compete with virtual shops for consumers with Internet access, or...
PRICE DYNAMICS AND SHAKE-OUTS IN ELECTRONIC MARKETS
This paper presents a model that explains the recent evolution of e-commerce, where over time, prices can increase if no exit occurs, or decrease, if exit occurs. In the model there is uncertainty...
Entry, Cost Reduction and Competition in The Portuguese Mobile Telephone Industry
Gagnepain, Philippe, Pereira, Pedro
We study the effect of entry on costs and competition in the Portuguese mobile telephony industry. We construct and estimate a model that includes demand, network, and cost equations. The latter...
Effect of outliers on forecasting temporally aggregated flow variables
Luiz Hotta, Pedro Pereira, Rissa Ota
Additive outliers, innovation outliers, forecasting, temporal aggregation, 62M10, 62M20,
Investment and welfare implications of the ownership structure of overlapping networks
We analyze the impact of the ownership structure of cable television firms on the incentives to upgrade the cable networks to offer telecommunication services. First, we show that dual ownership of a...
Risk Attitudes and Internet Search Engines: Theory and Experimental Evidence
Aurora García-Gallego, Nikolaos Georgantzís, Pedro Pereira
This paper analyzes the impact on consumer prices of the size and biases of price comparison search engines. We develop several theoretical predictions, in the context of a model related to Burdett...
Aurora García-Gallego, Nikolaos Georgantzís, Pedro Pereira
In a four-treatment experiment, we test some of the hypotheses in García-Gallego et al. (2004) concerning competition among a number of firms of which some (or all) are indexed by a price-comparison...
Simulation of Merger in Mobile Telephony in Portugal
Lukasz Grzybowski, Pedro Pereira
This article assesses the unilateral eects of a merger in the Portuguese mobile telephony market. We use aggregate quarterly data from 1999 to 2005 and a nested logit model to estimate the price...
Merger Simulation in Mobile Telephony in Portugal
Lukasz Grzybowski, Pedro Pereira
This article assesses the unilateral effects on prices of a merger in the Portuguese mobile telephony market. We use aggregate quarterly data from 1999 to 2005 and a nested logit model to estimate...
Incentives to Invest and to Give Access to Non-Regulated Next Generation Networks
Duarte Brito, Pedro Pereira, João Vareda
We analyze the incentives of a telecommunications incumbent to invest and give access to a downstream entrant to a next generation network. We model the industry as a duopoly, where a vertically...
Can Two-Part Tariffs Promote Efficient Investment on Next Generation Networks?
Duarte Brito, Pedro Pereira, João Vareda
We analyze if two-part access tariffs solve the dynamic consistency problem of the regulation of Next Generation Networks. We model the industry as a duopoly, where a vertically integrated incumbent...
Incentives to Invest and to Give Access to Non-Regulated Next Generation Networks
Duarte Brito, Pedro Pereira, João Vareda
We analyze the incentives of a telecommunications incumbent to invest and give access to a downstream entrant to a next generation network, NGN. We model the industry as a duopoly, where a vertically...
Product differentiation when competing with the suppliers of bottleneck inputs
We analyze the product differentiation decision of a downstream entrant that purchases access to a bottleneck input from one of two vertically integrated incumbents, who will compete with him in the...