Computable Aggregations

In this paper, we postulate computation as a key element in assuring the consistency of a family of aggregation functions so that such a family of operators can be considered an aggregation rule. In particular, we suggest that the concept of an aggregation rule should be defined from a computational point of view, focusing on the computational properties of such an aggregation, i.e., on the manner in which the aggregation values are computed. The new algorithmic definition of aggregation we propose provides an operational approach to aggregation, one that is based upon lists of variable length and that produces a solution even when portions of data are inserted or deleted. Among other advantages, this approach allows the construction of different classifications of aggregation rules according to the programming paradigms used for their computation or according to their computational complexity

Fuller Employment with Less Inflation

Ten essays that focus on the tendency toward a combination of inflation and high employment during the 1970s.https://research.upjohn.org/up_press/1146/thumbnail.jp

Design and Implementation of a Multi-Purpose Object-Orientated Spatio-Temporal (MPooST) Data Model for Cadastral and Land Information Systems (C/LIS)

The application of the object-oriented methodology in geospatial information management has significantly increased during the last 10 years and tends to gradually replace the status quo relational technology. In general, object orientation offers a flexible and adaptable modelling framework to satisfy the most demanding complex data structuring requirements. The objective of this thesis is to determine how a modern Land Information System used for cadastral purposes can benefit from an object-oriented methodology. To this aim, a Multi-Purpose, Object-Oriented Spatio-Temporal (abbreviated as MPOOST) data model has been developed. In brief, the MPOOST data model embodies spatial data and their temporal reference in the form of objects which contain their attributes as well as their behaviour. The design of the MPOOST data model has been specified in such a way that it enables other data models to exploit its functionality, therefore enabling the multi-purpose aspect. At first, the requirements of Land Information Systems are being examined. Next, the functionality that is offered by the object-oriented methodology is being analysed in detail. Even if the bibliography is quite rich in relevant research, however there seems to be no starting point regarding the application of OO in LIS. Hence, a whole chapter of this thesis has been dedicated in an extended bibliographic research. Finally, the OO methodology is applied for the design and implementation of the MPOOST data model. The outcome of the design and the implementation is the first version of the MPOOST data model written using the Java object-oriented programming language. In this way, it is proven that: the relational technology has significant drawbacks which prohibit it from being applied in conceptually demanding information systems; and that object-orientation can fully satisfy the most complex data structuring requirements posed in modern geographic information systems

Regional Economic Integration in Central Asia and South Asia

The Central and South Asia regions have a long history of trade relations. There have nearly always been movements of goods and people between the regions, which in turn have linked their cultural and religious ties and impacted political relations. Yet today’s trade between the two regions remains low and significantly below regional trade in Africa, the Middle East, Latin America and Southeast Asia. Using different measures of trade, we estimate that inter-regional trade is only between 0.2 and 4 percent of total trade to all destinations. Even within the regions, trade among countries remains low. Intra-regional trade in Central Asia is less than 5 percent and that of South Asia is 1.5 percent of trade with all countries. The present study explores opportunities and challenges for intra- and inter-regional trade in the Central and South Asia areas by analyzing a wide range of channels impacting trade. Trade enhancing channels are divided into two broad categories. The first set refers to disaggregated or product-level characterizations of trade affecting competitiveness and complementarities between trading partners within and between the regions. The second refers to price, non-price and structural determinants that tend to affect all products traded between countries. The analysis also includes a gravity model to gauge the effect of economic growth, distance and price, non-price and structural determinants of regional trade. The empirical results indicate that, under existing trade patterns, the potential value of trade in the two regions is nearly twice as large as the actual level. The finding is not surprising. Opportunities for regional trade abound and there are numerous policy initiatives that could be taken to help spur trade and investment in and between the two regions. Among the possibilities are regional value chains that could create large gains in terms of higher value additions to exports, technologies transfers and employment generation. The analysis of different types of value chains in this study categorizes industries according to their value added contribution to trade, and it prioritizes industries according to interests ranging from the diversification of industries across resource-intensive, labor-intensive, and technology-intensive industries, as well as the potential participation of Afghanistan due to its comparative advantages in products exported by the industries or its geographic location for transit trade. Based on quantitative analyzes of actual and potential channels of trade, the study ranks the pattern of trade in terms of its adaptability to intra- and cross-regional commerce in the Central and South Asia regions and its predilection for regional value chains. The ranking uses an innovative methodology that takes account of difference preference orderings of stakeholders, such as governments and development partners that have interests in pro-poor trade, or large companies that favor cross-border fragmentation of production for regional and global value chains. Ratings are classified into the following categories: trade complementarities, export diversification, comparative advantages, structural factors, intra-industry trade, price competitiveness, trade costs, economic growth; and regional value chains. The baseline ratings suggest the following: First, the larger economies have higher ratings than the smaller, less developed ones, suggesting that size and level of development matter in the development of regional trade. Second, among the different channels of regional trade development, the most effective ones are (i) measures that promote price competitiveness; (ii) intra-industry trade; (iii) trade complementarities; and (iv) economic growth. Third, the effectiveness of country-specific measures differ, as for example in Afghanistan, where the trade enhancing channels that matter the most are structural factors, price competitiveness and trade complementarities with other countries in South Asia and with Central Asia in general. These findings have important implications for the ability of different trade-related policies, programs and institutional mechanisms to successfully promote greater commerce within and across the two regions. Each of these mechanisms has costs associated with them and different types of mechanisms can be programmed on the basis of their ease of implementation and impact potential. The material in this study is designed in such a way as to provide practical knowledge and methods for businesses to take advantage of Central and South Asia regional opportunities; analytical tools for policymakers and researchers; and policy and program recommendations for governments and development partners. It should be of interest to businesses, governments, international development partners, policymakers and researchers, and others concerned with Central and South Asia’s trade and the potential for developing value chains or so-called ‘trade in tasks’ across the two regions

Regional Economic Integration in Central Asia and South Asia

The Central and South Asia regions have a long history of trade relations. There have nearly always been movements of goods and people between the regions, which in turn have linked their cultural and religious ties and impacted political relations. Yet today’s trade between the two regions remains low and significantly below regional trade in Africa, the Middle East, Latin America and Southeast Asia. Using different measures of trade, we estimate that inter-regional trade is only between 0.2 and 4 percent of total trade to all destinations. Even within the regions, trade among countries remains low. Intra-regional trade in Central Asia is less than 5 percent and that of South Asia is 1.5 percent of trade with all countries. The present study explores opportunities and challenges for intra- and inter-regional trade in the Central and South Asia areas by analyzing a wide range of channels impacting trade. Trade enhancing channels are divided into two broad categories. The first set refers to disaggregated or product-level characterizations of trade affecting competitiveness and complementarities between trading partners within and between the regions. The second refers to price, non-price and structural determinants that tend to affect all products traded between countries. The analysis also includes a gravity model to gauge the effect of economic growth, distance and price, non-price and structural determinants of regional trade. The empirical results indicate that, under existing trade patterns, the potential value of trade in the two regions is nearly twice as large as the actual level. The finding is not surprising. Opportunities for regional trade abound and there are numerous policy initiatives that could be taken to help spur trade and investment in and between the two regions. Among the possibilities are regional value chains that could create large gains in terms of higher value additions to exports, technologies transfers and employment generation. The analysis of different types of value chains in this study categorizes industries according to their value added contribution to trade, and it prioritizes industries according to interests ranging from the diversification of industries across resource-intensive, labor-intensive, and technology-intensive industries, as well as the potential participation of Afghanistan due to its comparative advantages in products exported by the industries or its geographic location for transit trade. Based on quantitative analyzes of actual and potential channels of trade, the study ranks the pattern of trade in terms of its adaptability to intra- and cross-regional commerce in the Central and South Asia regions and its predilection for regional value chains. The ranking uses an innovative methodology that takes account of difference preference orderings of stakeholders, such as governments and development partners that have interests in pro-poor trade, or large companies that favor cross-border fragmentation of production for regional and global value chains. Ratings are classified into the following categories: trade complementarities, export diversification, comparative advantages, structural factors, intra-industry trade, price competitiveness, trade costs, economic growth; and regional value chains. The baseline ratings suggest the following: First, the larger economies have higher ratings than the smaller, less developed ones, suggesting that size and level of development matter in the development of regional trade. Second, among the different channels of regional trade development, the most effective ones are (i) measures that promote price competitiveness; (ii) intra-industry trade; (iii) trade complementarities; and (iv) economic growth. Third, the effectiveness of country-specific measures differ, as for example in Afghanistan, where the trade enhancing channels that matter the most are structural factors, price competitiveness and trade complementarities with other countries in South Asia and with Central Asia in general. These findings have important implications for the ability of different trade-related policies, programs and institutional mechanisms to successfully promote greater commerce within and across the two regions. Each of these mechanisms has costs associated with them and different types of mechanisms can be programmed on the basis of their ease of implementation and impact potential. The material in this study is designed in such a way as to provide practical knowledge and methods for businesses to take advantage of Central and South Asia regional opportunities; analytical tools for policymakers and researchers; and policy and program recommendations for governments and development partners. It should be of interest to businesses, governments, international development partners, policymakers and researchers, and others concerned with Central and South Asia’s trade and the potential for developing value chains or so-called ‘trade in tasks’ across the two regions

The Continuum Architecture: Towards Enabling Chaotic Ubiquitous Computing

Interactions in the style of the ubiquitous computing paradigm are possible today, but only in handcrafted environments within one administrative and technological realm. This thesis describes an architecture (called Continuum), a design that realises the architecture, and a proof-of-concept implementation that brings ubiquitous computing to chaotic environments. Essentially, Continuum enables an ecology at the edge of the network, between users, competing service providers from overlapping administrative domains, competing internet service providers, content providers, and software developers that want to add value to the user experience. Continuum makes the ubiquitous computing functionality orthogonal to other application logic. Existing web applications are augmented for ubiquitous computing with functionality that is dynamically compiled and injected by a middleware proxy into the web pages requested by a web browser at the user?s mobile device. This enables adaptability to environment variability, manageability without user involvement, and expansibility without changes to the mobile. The middleware manipulates self-contained software units with precise functionality (called frames), which help the user interact with contextual services in conjunction with the data to which they are attached. The middleware and frame design explicitly incorporates the possibility of discrepancies between the assumptions of ubiquitous-computing software developers and field realities: multiple administrative domains, unavailable service, unavailable software, and missing contextual information. A framework for discovery and authorisation addresses the chaos inherent to the paradigm through the notion of role assertions acquired dynamically by the user. Each assertion represents service access credentials and contains bootstrapping points for service discovery on behalf of the holding user. A proof-of-concept prototype validates the design, and implements several frames that demonstrate general functionality, including driving discovery queries over multiple service discovery protocols and making equivalences between service types, across discovery protocols

Space Communications: Theory and Applications. Volume 3: Information Processing and Advanced Techniques. A Bibliography, 1958 - 1963

Annotated bibliography on information processing and advanced communication techniques - theory and applications of space communication

Sustainable Development in Agriculture

Food problems -- the efficient production or procurement of food and its appropriate distribution among members of society -- are problems endemic to mankind. Yet the nature and dimensions of these problems have been changing over time. As economic systems have developed, specialization has increased; and this has led to increased interdependences of rural and urban areas, of agricultural and nonagricultural sectors, and of nations This book focuses on the interactions between resources, technologies, and environment in agricultural systems and on their consequences for long-run agricultural development. It presents development of some methodological approaches as weLL as case studies of differing regions using systems analysis. The case studies cover a wide variety of countries and economic systems, and provide examples of dealing with an extensive range of issues concerning sustainability of agriculture