Object/Relational Access Layers Object/Relational Access Layers (2009)
Missing Links, More Patterns, Wolfgang Keller
non-exclusive right to publish and distribute this paper in book form only, in the publication Titled
Coldewey Consulting entwickelt, (2009)
Große Informationssysteme, Wolfgang Keller
• Sie wurde bisher verwendet als: • Tutorial auf der Object World 1998, „Choosing a Database Technology“ • Tutorial auf der OOPSLA 2000 „Choosing Database Technology for Object-Oriented...
Abstract Relational Database Access Layers A Pattern Language The Key Patterns (2008)
Wolfgang Keller, Jens Coldewey
The Relational Database Access Layer helps you design applications that use relational databases and also reflect the relational calculus at a business object level. Such applications are known as...
Abstract Some Patterns for Insurance Systems (2008)
Building flexible insurance systems that allow short product release cycles is a challenge for many insurance firms. Despite the huge market and the many projects that do near identical things these...
Multilayer Class Last Resort (2008)
Jens Coldewey, Wolfgang Keller
Multilayer Class deals with the connection of adjacent layers in a layered architecture [BMR+96, pp.31] when using statically typed languages. Standard coupling techniques, such as simple calls,...
This paper is an extended abstract for a talk at OOP 2004 on “Persistence Options for Object-Oriented Programs”. It gives you a bird’s eye view of the field of persistence options for o-o...
Edited by the Department World Economy (2008)
Wolfgang Keller, Wolfgang Keller, Head Prof, Dr. Hans-eckart Scharrer, ...
at the World’s
Abstract Mapping Objects to Tables A Pattern Language (2008)
Mapping Objects to Tables is a problem that has occurred as long as people want to program in an object oriented language but have to use relational instead of object oriented databases for some...
Managing Application Portfolios in Merger Situations (2008)
Abstract: Today mergers of larger financial institutions are quite common place. You often find conglomerates that stem from a sequence of merger & acquisition activities. In each such case, IT...
Imagine you are the person responsible for the application portfolio of a large insurance company. For their business the company runs one monolithic system for most of its product divisions 1. This...
Abstract Some Patterns for Insurance Systems (2008)
Building flexible insurance systems that allow short product release cycles is a challenge for many insurance firms. Despite the huge market and the many projects that do near identical things these...
Permission granted to copy for (2007)
Abstract: This paper presents several patterns for distributing business information systems that are structured according to a layered architecture. 2 Each distribution pattern cuts the architecture...
This pattern is the starting point for our discussion of the architecture of business information systems. It acts like an index to the other pattern papers, which we will refer to in several...
Jens Coldewey, Wolfgang Keller
eparate the layers 2 , each of them hiding certain pitfalls: 1. Wrap the database specific code with a Facade [GOF95]. 2. Use the Envelope-Letter idiom [COP92]. 3. Use an Observer pattern [GOF95]. 1...
Approaches to Software Architecture (2007)
Christoph Hofmann, Eckart Horn, Wolfgang Keller, Klaus Renzel, Monika Schmidt, Wirth Horn, ...
Modern software systems are of growing complexity. The importance of distributed systems and networking increases. To guarantee the ability of understanding and maintaining complex systems, some...
Forthcoming, American Economic Review (2007)
Wolfgang Keller, Anne Golla, Paula Hern
Income convergence across countries turns on whether technological knowledge spillovers are global or local. I estimate the amount of spillovers from R&D expenditures on a geographic basis, using...
NBER WORKING PAPER SERIES INTERNATIONAL TECHNOLOGY DIFFUSION (2007)
Jel No. F, Wolfgang Keller, Wolfgang Keller, Wolfgang Keller
I would like to thank Sourafel Girma for providing some regression results. I have also benefited from conversations with Bob Baldwin and Elhanan Helpman, as well as from comments by Sam Kortum and...
Knowledge Spillovers at the World’s Technology Frontier 1 (2007)
Convergence in per capita income turns on whether technological knowledge spillovers are global or local. Global spillovers favor convergence, while a geographically limited scope of knowledge...
Wolfgang Keller, Especially Robert Evenson, Zvi Griliches, James Harrigan
This paper integrates earlier studies on the link of productivity and research and development (R&D) in different industries of a closed economy with the more recent emphasis on R&D-driven...
Forthcoming, Journal of Political Economy (2007)
Simon J. Evenett, Wolfgang Keller, Mahmoud El-gamal, Gordon Hanson, Elhanan Helpman, Dan Treßer
especially to an anonymous referee. We also thank Jim Rauch and Karl Aiginger for providing data used in this paper.
Geodetic Pseudodierential (2007)
Operators And The, Wolfgang Keller
The concept of pseudodi#erential operators (PDO) is introduced as a generalization of the usual concepts of di#erential and integral operators. Based on the PDO concept in Euclidean spaces the...
F11: Neoclassical Model of Trade (2005)
Shuichiro Nishioka, Wolfgang Keller
This study examines the international trade of developed countries with the Heckscher–Ohlin–Vanek (HOV) model. In spite of its theoretical importance, previous empirical work failed to support...
Markets in China and Europe on the Eve of the Industrial Revolution (2004)
Carol H. Shiue, Wolfgang Keller
Prevailing views suggest the Industrial Revolution began in Europe because markets had gradually become more efficient and by the 18th century the scope of economic activity was far larger than in...
München, Techn. Universiẗat, Diss., 2003.
On Theories Explaining the Success of the Gravity Equation (2002)
Simon J. Evenett, Wolfgang Keller
We examine whether two important theories of trade, the Heckscher- Ohlin theory and the increasing returns theory, can account for the empirical success of the so-called gravity equation. Since...
The Dual Nature of Trade: Measuring its Impact on Imitation and Growth (2001)
Michelle Connolly, Jel F, Wolfgang Keller, Jean Lanjouw, Edward Leamer, Enrique Mendoza, ...
: Imports of goods that embody foreign technology can raise a country's output directly as inputs into production and indirectly through reverse-engineering of these goods, which contributes to...
NBER WORKING PAPER SERIES INTERNATIONAL TECHNOLOGY DIFFUSION (2001)
Wolfgang Keller, Wolfgang Keller, Jel No. F, Wolfgang Keller
I would like to thank Sourafel Girma for providing some regression results. I have also benefited from conversations with Bob Baldwin and Elhanan Helpman, as well as from comments by Sam Kortum and...
Do Trade Patterns and Technology Flows Affect Productivity Growth? (2000)
This article presents a model suggesting that the pattern of a country's intermediate goods imports affects its level of productivity because a country that imports such goods primarily from...
Environmental Compliance Costs And Foreign Direct Investment Inflows To U.s. States (1999)
Wolfgang Keller, Wolfgang Keller, Arik Levinson, Arik Levinson
This paper estimates the extent to which changing environmental standards have altered patterns of international investment. Our analysis goes beyond the existing literature in three ways. First, we...
The dual nature of trade: Measuring its impact on imitation and growth'', working paper (1998)
Michelle Connolly, Wolfgang Keller, Jean Lanjouw, Edward Leamer, Marjorie Mcelroy, Enrique Mendoza, ...
Imports of goods that embody foreign technology can raise a country’s output directly as inputs into production and indirectly through reverse engineering of these goods, contributing to domestic...
Object/Relational Access Layers - A Roadmap, Missing Links and More Patterns (1998)
Designing software to connect an object-oriented business system with a relational database is a tedious task. Object-orientation and the relational paradigm differ quite a bit. An application that...
Mapping Objects to Tables - A Pattern Language (1997)
Mapping Objects to Tables is a problem that has occurred as long as people want to program in an object oriented language but have to use relational instead of object oriented databases for some...
Client/Server Distribution - A Pattern Language (1997)
Window ToolKit (AWT) to increase the usability of the application interface compared to the form-based variant. The application kernel can be implemented in Java as well, so that Remote Method...
Relational Database Access Layers - A Pattern Language (1996)
Wolfgang Keller, Jens Coldewey, Char( Custno, Char( Custname, Char( Artname, Numeric( Artprice, ...
Constructor [Lan96] encapsulated in a Þ View Factory. Pattern: Transaction Object You applied the Relational Database Access Layer Framework. You need to define an interface for the start, commit...
The Field of Software Architecture (1996)
Monika Schmidt, Christoph Hofmann, Christoph Hofmann, Eckart Horn, Eckart Horn, ...
: Modern software systems are becoming more and more complex. The importance of distributed systems and networking increases. To guarantee the ability of understanding and maintaining complex...
The field of software architecture (1996)
Christoph Hofmann, Christoph Hofmann, ...
Modern software systems are becoming more and more complex. The importance of distributed systems and networking increases. To guarantee the ability of understanding and maintaining complex systems,...
Relational Database Access Layers - A Pattern Language: The Key Patterns (1996)
Wolfgang Keller, Jens Coldewey
The Relational Database Access Layer helps you design applications that use relational databases and also reflect the relational calculus at a business object level. Such applications are known as...
Jens Coldewey, Wolfgang Keller
Multilayer Class deals with the connection of adjacent layers in a layered architecture [BMR+96, pp.31] when using statically typed languages. Standard coupling techniques, such as simple calls,...
Object Identifiers for Relational Legacy Data (1995)
Wolfgang Keller, M Mnchen Februar
i 2 The Problem 1 3 Architecture 3 4 Our Solution 3 4.1 Running Example 3 4.2 The ODMG Solution 4 4.3 Our Current Solution 5 4.3.1 User Code Example 5 4.3.2 Need for Number Servers 6 4.4 Why we do...
Mapping Associations from OODBs to RDBMs (1995)
Oodbs To Rdbms, Wolfgang Keller
1 2 The Problem 1 3 Architecture 2 4 Mapping Associations 3 4.1 First Example - 1:n Association 3 4.2 Various Solutions 5 4.3 Second Example - n:m Association 6 4.4 Our Proposed Solution 7 4.5 The...
Pollution Abatement Costs and Foreign Direct Investment Inflows to U.S (1994)
Wolfgang Keller, Arik Levinson
This paper estimates the effect of changing environmental standards on patterns of international investment. The analysis advances the existing literature in three ways. First, we avoid comparing...
Thesis (doctoral)--Universität Karlsruhe, 1989.
Ehrfeld, Wolfgang., Keller, Wolfgang., Seidel, Dieter.
Zugl.: Karlsruhe, Univ., Diss. W. Keller, 1989.
Freiburg (Breisgau), Univ., Diss., 1987 (Nicht f.d. Austausch).
Zur Behandlung des geodätischen Randwertproblems mittels Berührungstransformation. (1986)
Dresden, Techn. Univ., Diss. B, 1986 (Nicht f.d. Austausch).
Zur Bahnmechanik geostationärer Satelliten. (1981)
Dresden, Techn. Univ., Diss. A, 1981 (Nicht f.d. Austausch).
Untersuchungen über Aufbau und Zusammensetzung von Gallensteinen. (1975)
Heidelberg, Univ., Med. Gesamtfak., Diss., 1975. (Nicht f. d. Austausch.).
Probleme der Diagnose, Ätiologie und Therapie des Achselvenenstaues. (1969)
Kiel, Med. F., Diss. v. 18. Febr. 1969.
Majdič, Aleksander., Keller, Wolfgang.
Dissertation s. Keller, Wolfgang.
Aachen, T. H., F. f. Bergbau u. Hüttenw., Diss. v. 20. März 1967.
Neue kritische Drehzahlen von einfach besetzten Wellen. (1957)
Aus: Ingenieur-Archiv. Bd 25. 1957, H. 2, S. 71-89
Zur Schmerzausschaltung bei der transvesikalen Prostatektomie. (1957)
Freiburg i. B., Med. F., Diss. v. 8. Mai 1957 (Nicht f. d. Aust.).
Dass. Ausz. u. d. T.: Keller: Zur polarographischen Bestimmung des Vitamins A. Vorläufige Mitteilg. Mit 3 Textabb. - Berlin. Göttingen, Heidelberg: Springer: München: Bergmann (1955). S. 26-29....
Dass. Ausz. (Tübingen [1954]: Bölzle.) 2 Bl. 8
Über den Einfluss des Lezithin auf die Ionen- und Albuminwirkung im Gewebe : . (1951)
Köln, Med. F., Diss. v. 27. Juli 1951 (Nicht f. d. Aust.).
Market Integration and Economic Development: A Long-run Comparison
Wolfgang Keller, Carol H. Shiue
How much of China's recent economic performance can be attributed to market-oriented reforms introduced in the last two decades? A long-run perspective may be important for understanding the process...
The Origins of Spatial Interaction
Keller, Wolfgang, Shiue, Carol Hua
Geography shapes economic outcomes in a major way. This Paper uses spatial empirical methods to detect and analyse trade patterns in a historical dataset on Chinese rice prices. Our results suggest...
Market Integration and Economic Development: A Long-Run Comparison
Keller, Wolfgang, Shiue, Carol Hua
How much of China’s recent economic performance can be attributed to market-oriented reforms introduced in the last two decades? A long-run perspective may be important for understanding the...
Markets in China and Europe on the Eve of the Industrial Revolution
Keller, Wolfgang, Shiue, Carol Hua
Current orthodoxy suggests that the Industrial Revolution began in Europe because European institutions promoted comparatively high levels of market efficiency. This Paper compares the actual...
On Theories Explaining the Success of the Gravity Equation
Simon J. Evenett, Wolfgang Keller
We examine whether two important theories of trade, the Heckscher-Ohlin theory and the increasing returns theory, can account for the empirical success of the so-called gravity equation. Since...
Keller, Wolfgang, Smarzynska Javorcik, Beata, Tybout, James R
This paper uses a case study approach to explore the effects of NAFTA and GATT membership on innovation and trade in the Mexican soaps, detergents and surfactants (SDS) industry. Several basic...
Javorcik, Beata, Keller, Wolfgang, Tybout, James
This paper uses a case study approach to explore the effects of NAFTA and GATT membership on innovation and trade in the Mexican soaps, detergents, and surfactants (SDS) industry. Several basic...
Technology Transfer through Imports
Acharya, Ram C., Keller, Wolfgang
While there is general agreement that technology differences must figure prominently in any successful account of the cross-country income variation, not much is known on the source of these...
Geographic Localization of International Technology Diffusion
Income convergence across countries turns on whether technological knowledge spillovers are global or local. I estimate the amount of spillovers from R&D expenditures on a geographic basis, using a...
How trade patterns and technology flows affect productivity growth
Earlier studies of spillovers from international research and development (R&D) suggest how economies benefit from R&D conducted abroad. To the extent that countries importing new technologies do not...
Market Integration and Economic Development: A Long-run Comparison
Wolfgang Keller, Carol H. Shiue
How much of China's recent economic performance can be attributed to market-oriented reforms introduced in the last two decades? A long-run perspective may be important for understanding the process...
Markets in China and Europe on the Eve of the Industrial Revolution
Carol H. Shiue, Wolfgang Keller
Why did Western Europe industrialize first? An influential view holds that its exceptionally well-functioning markets supported with a certain set of institutions provided the incentives to make...
Wolfgang Keller, Stephen R. Yeaple
We estimate international technology spillovers to U.S. manufacturing firms via imports and foreign direct investment (FDI) between the years of 1987 and 1996. In contrast to earlier work, our...
Tariffs, Trains, and Trade: The Role of Institutions versus Technology in the Expansion of Markets
Keller, Wolfgang, Shiue, Carol Hua
We study the relative importance of technology and institutions as factors determining the size of markets. The setting of 19th century Europe presents a unique opportunity to address this issue,...
International Technology Diffusion
This paper surveys what is known about the extent of international technology diffusion and channels through which technology spreads. Productivity differences explain much of the variation in...
Geographic Localization of International Technology Diffusion
Convergence in per capita income across countries turns on whether technological knowledge spillovers are global or local in a large class of models. This Paper estimates the amount of spillovers...
Knowledge Spillovers at the World's Technology Frontier
Convergence in per capita income turns on whether technological knowledge spillovers are global or local. Global spillovers favour convergence, while a geographically limited scope of knowledge...
On Theories Explaining the Success of the Gravity Equation
Simon J. Evenett, Wolfgang Keller
We analyze two main theories of international trade, the Heckscher-Ohlin theory and the Increasing Returns trade theory, by examining whether they can account for the empirical success of the...
In this paper, I analyze recent findings by Coe and Helpman (1995) of trade-related international R&D spillovers. I show generally that randomly created bilateral trade shares also give rise to large...
Trade Patterns, Technology Flows, and Productivity Growth
This paper presents a model of international trade in differentiated intermediate goods. Because intermediates are invented through costly R&D investments, employing foreign intermediates implies...
Trade and the Transmission of Technology
This paper studies the role of trade, both domestically as well as internationally, as a channel of technology transmission. A model is presented in which R&D investments towards product innovations...
Trade and the Transmission of Technology
I present a model of R&D-driven growth which predicts that technology, in form of product designs and created through R&D investments, is transmitted to other domestic and foreign sectors by being...
In this paper we emphasize the contribution of technical change, broadly defined, towards productivity growth in explaining the relative East Germany-West Germany performance during the post-World...
Trade and the Transmission of Technology.
This paper integrates earlier studies on the link of productivity and research and development (R&D) in different industries of a closed economy with the more recent emphasis on R&D-driven growth and...
International Technology Diffusion
I discuss the concept and empirical importance of international technology diffusion from the point of view of recent work on endogenous technological change. In this literature, technology is viewed...
Keller, Wolfgang, Yeaple, Stephen R
We estimate international technology spillovers to US manufacturing firms via imports and foreign direct investment (FDI) between the years 1987-96. In contrast to earlier work, our results suggest...
Technology Flows between Industries: Identification and Productivity Effects.
This paper investigates whether the Yale Technology Concordance (YTC) succeeds in identifying technology flows between sectors. As a test, total factor productivity (TFP)-R&D regressions based on the...
Pollution Abatement Costs and Foreign Direct Investment Inflows to U.S. States
Wolfgang Keller, Arik Levinson
This paper estimates the effect of changing environmental standards on patterns of international investment. The analysis advances the existing literature in three ways. First, we avoid comparing...
Do Trade Patterns and Technology Flows Affect Productivity Growth?
This article presents a model suggesting that the pattern of a country's intermediate goods imports affects its level of productivity because a country that imports such goods primarily from...
Wolfgang Keller, Stephen R. Yeaple
International trade , United States , Productivity , Economic growth , Foreign investment ,
Keller, Wolfgang, Yeaple, Stephen R.
We estimate international technology spillovers to U.S. manufacturing firms via imports and foreign direct investment (FDI) between the years of 1987 and 1996. In contrast to earlier work, our...
Estimating the Productivity Selection and Technology Spillover Effects of Imports
Acharya, Ram C., Keller, Wolfgang
In the wake of falling trade costs, two central consequences in the importing economy are, first, that stronger competition through increased imports can lead to market share reallocations among...
Estimating the Productivity Selection and Technology Spillover Effects of Imports
Ram C. Acharya, Wolfgang Keller
Economists emphasize two channels through which import liberalization affects productivity, one operating between and the other within firms. According to the former, import competition triggers...
Environmental Regulations and FDI Inflows to U.S. States
Wolfgang Keller, Arik Levinson
This paper estimates the extent to which stringent environmental standards in some U.S. states have deterred foreign direct investment (FDI). It addresses three shortcomings in the existing...
In this paper, I analyze recent findings by Coe and Helpman (1995) on trade-related international R&D spillovers. A Monte Carlo based robustness test is proposed which compares the elasticity of...
In this paper we emphasize the contribution of technical change, broadly defined, towards productivity growth in explaining the relative East Germany-West Germany performance during the post-World...
Trade and Transmission of Technology
We present a model of R&D-driven growth which predicts that technology, in the form of product designs and created through R&D investments, is transmitted to other domestic and foreign sectors by...
On Theories Explaining the Success of the Gravity Equation
Simon J. Evenett, Wolfgang Keller
We analyze two main theories of international trade, the Heckscher-Ohlin theory and the Increasing Returns trade theory, by examining whether they can account for the empirical success of the...
How Trade Patterns and Technology Flows Affect Productivity Growth
This paper examines the evidence on technology diffusion through trade in differentiated intermediate goods. Because intermediates are invented through costly research and development (R&D)...
Environmental Compliance Costs and Foreign Direct Investment Inflows to U.S. States
Wolfgang Keller, Arik Levinson
This paper estimates the extent to which changing environmental standards have altered patterns of international investment. Our analysis goes beyond the existing literature in three ways. First, we...
Geographic Localization of International Technology Diffusion
Convergence in per capita income across countries turns on whether technological knowledge spillover are global or local. This paper estimates the amount of spillover from R&D expenditures in major...
The Geography and Channels of Diffusion at the World's Technology Frontier
Convergence in per capita income turns on whether technological knowledge spillovers are global or local. Global spillovers favor convergence, while a geographically limited scope of knowledge...
International Technology Diffusion
I discuss the concept and empirical importance of international technology diffusion from the point of view of recent work on endogenous technological change. In this literature, technology is viewed...
Wolfgang Keller, Stephen R. Yeaple
We estimate international technology spillovers to U.S. manufacturing firms via imports and foreign direct investment (FDI) between the years of 1987 and 1996. In contrast to earlier work, our...
The Origins of Spatial Interaction
Wolfgang Keller, Carol H. Shiue
Geography shapes economic outcomes in a major way. This paper uses spatial empirical methods to detect and analyze trade patterns in a historical data set on Chinese rice prices. Our results suggest...
Markets in China and Europe on the Eve of the Industrial Revolution
Carol H. Shiue, Wolfgang Keller
Prevailing views suggest the Industrial Revolution began in Europe because markets had gradually become more efficient and by the 18th century the scope of economic activity was far larger than in...
Beata Smarzynska Javorcik, Wolfgang Keller, James R. Tybout
This paper uses a case study approach to explore the effects of NAFTA and GATT membership on innovation and trade in the Mexican soaps, detergents and surfactants (SDS) industry. Several basic...
Technology Transfer through Imports
Ram C. Acharya, Wolfgang Keller
While there is general agreement that technology differences must figure prominently in any successful account of the cross-country income variation, not much is known on the source of these...
Tariffs, Trains, and Trade: The Role of Institutions versus Technology in the Expansion of Markets
Wolfgang Keller, Carol H. Shiue
We study the relative importance of technology and institutions as factors determining the size of markets. The setting of 19th century Europe presents a unique opportunity to address this issue,...
Trade Patterns, Technology Flows, and Productivity Growth: Any Relationship?
In this paper, I examine the relation of trade patterns, technology flows, and productivity growth; in particular, the hypothesis that foreign R&D investments which are transmitted through trade in...
The Geography and Channels of Diffusion at the World's Technology Frontier
Convergence in per capita income turns on whether technological knowledge spillovers are global or local. Global spillovers favor convergence, while a geographically limited scope of knowledge...
Global Production and Trade in the Knowledge Economy
Wolfgang Keller, Stephen R. Yeaple
This paper presents and tests a new model of multinational firms to explain a rich array of multinational behavior. In contrast to most approaches, here the multinational faces costs to transferring...
Beata Javorcik, Wolfgang Keller, James Tybout
This paper uses a case study approach to explore the effects of NAFTA and GATT membership on innovation and trade in the Mexican soaps, detergents and surfactants (SDS) industry. Several basic...
Global Production and Trade in the Knowledge Economy
Keller, Wolfgang, Yeaple, Stephen R
This paper presents and tests a new model of multinational firms to explain a rich array of multinational behavior. In contrast to most approaches, here the multinational faces costs to transferring...
Global Production and Trade in the Knowledge Economy
Wolfgang Keller, Stephen R. Yeaple
This paper presents and tests a new model of multinational firms to explain a rich array of multinational behaviour. In contrast to most approaches, here the multinational faces costs to transferring...
International Trade, Foreign Direct Investment, and Technology Spillovers
This paper examines how international flows of technological knowledge affect economic performance across industries and firms in different countries. Motivated by the large share of the world's...
International Trade, Foreign Direct Investment, and Technology Spillovers
This paper examines how international flows of technological knowledge affect economic performance across industries and firms in different countries. Motivated by the large share of the world's...
Gravity in the Weightless Economy
Keller, Wolfgang, Yeaple, Stephen R
This paper studies the international mobility of technology through the lens of multinational firms. We show that gravity applies to the activity of multinational firms, and the strength of gravity...
Gravity in the Weightless Economy
Wolfgang Keller, Stephen R. Yeaple
This paper studies the international mobility of technology through the lens of multinational firms. We show that gravity applies to the activity of multinational firms, and the strength of gravity...