Pattern Reification as the Basis for Description-Driven Systems

One of the main factors driving object-oriented software development for information systems is the requirement for systems to be tolerant to change. To address this issue in designing systems, this paper proposes a pattern-based, object-oriented, description-driven system (DDS) architecture as an extension to the standard UML four-layer meta-model. A DDS architecture is proposed in which aspects of both static and dynamic systems behavior can be captured via descriptive models and meta-models. The proposed architecture embodies four main elements - firstly, the adoption of a multi-layered meta-modeling architecture and reflective meta-level architecture, secondly the identification of four data modeling relationships that can be made explicit such that they can be modified dynamically, thirdly the identification of five design patterns which have emerged from practice and have proved essential in providing reusable building blocks for data management, and fourthly the encoding of the structural properties of the five design patterns by means of one fundamental pattern, the Graph pattern. A practical example of this philosophy, the CRISTAL project, is used to demonstrate the use of description-driven data objects to handle system evolution.Comment: 20 pages, 10 figure

Natural resources conservation management and strategies in agriculture

This paper suggests a holistic framework for assessment and improvement of management strategies for conservation of natural resources in agriculture. First, it incorporates an interdisciplinary approach (combining Economics, Organization, Law, Sociology, Ecology, Technology, Behavioral and Political Sciences) and presents a modern framework for assessing environmental management and strategies in agriculture including: specification of specific “managerial needs” and spectrum of feasible governance modes (institutional environment; private, collective, market, and public modes) of natural resources conservation at different level of decision-making (individual, farm, eco-system, local, regional, national, transnational, and global); specification of critical socio-economic, natural, technological, behavioral etc. factors of managerial choice, and feasible spectrum of (private, collective, public, international) managerial strategies; assessment of efficiency of diverse management strategies in terms of their potential to protect diverse eco-rights and investments, assure socially desirable level of environmental protection and improvement, minimize overall (implementing, third-party, transaction etc.) costs, coordinate and stimulate eco-activities, meet preferences and reconcile conflicts of individuals etc. Second, it presents evolution and assesses the efficiency of diverse management forms and strategies for conservation of natural resources in Bulgarian agriculture during post-communist transformation and EU integration (institutional, market, private, and public), and evaluates the impacts of EU CAP on environmental sustainability of farms of different juridical type, size, specialization and location. Finally, it suggests recommendations for improvement of public policies, strategies and modes of intervention, and private and collective strategies and actions for effective environmental protection

Integration of dairy farms in supply chain in bulgaria

This paper presents a new business model for an effective market inclusion of numerous small-scale dairy farms developed by a private entrepreneur. Firstly, it gives insight on development and challenges of Bulgarian dairy sector. Next, it describes the innovation, identifies drivers and changes of inclusion, and assesses its efficiency and sustainability. Finally, it evaluates the possibilities for up-scaling of the model, and suggests business and policies recommendations. Major features of the model include: developing a competitive dairy processing enterprise for locally produced milk; installing milk collecting, cooling, and controlling facilities in the neighborhood and within farms; modernizing milk supply and processing quality according to the top industry standards; building an effective system for governing relations (coordination, stimulation, control, conflict resolution) with individual farmers; developing a company mark and reputation for high quality products; introducing a great variety of specific, original and locally produced products into regional, national, and international markets. Critical factors for evolution of the model have been identified as: private entrepreneurship, experience and skills, technological discipline, available resources, introduction of innovations, effective governance (control, incentives, adjustment) of vertical relations, building a good reputation, development of markets and formal regulations. Integration of farmers has been associated with needs of progressive changes in breed of animals, technology of production, and labor organization, and led to higher income, quality of production, stability of sells and prices, care for animals and environment, and possibility for modernization and adaptation to formal requirements.chain governance, vertical integration, business innovation, farmers inclusion, dairy farming, Bulgaria

Contract Aware Components, 10 years after

The notion of contract aware components has been published roughly ten years ago and is now becoming mainstream in several fields where the usage of software components is seen as critical. The goal of this paper is to survey domains such as Embedded Systems or Service Oriented Architecture where the notion of contract aware components has been influential. For each of these domains we briefly describe what has been done with this idea and we discuss the remaining challenges.Comment: In Proceedings WCSI 2010, arXiv:1010.233

Mechanisms of Governance of Sustainable Development

In this paper we incorporate the interdisciplinary New Institutional and Transaction Costs Economics (combining Economics, Organization, Law, Sociology, Behavioral and Political Sciences), and suggest a framework for analyzing the mechanisms of governance of sustainable development. The agricultural sector is used to illustrate the approach, test the framework, and support with examples. Firstly, we discuss the modern concepts and the economics of sustainability. Secondly, we present a new framework for analysis and improvement of the governance of sustainable development. This new approach takes into account the role of specific institutional environment; and the behavioral characteristics of individual agents; and the transaction costs associated with the various forms of governance; and the critical factors of economic activity and exchanges; and the comparative efficiency of market, private, public and hybrid modes; and the potential of production structures for adaptation; and the comparative efficiency of alternative modes for public intervention. Finally, we identify specific modes for environmental governance in Bulgarian agriculture; and access the efficiency of market, private and public modes; and estimate the prospects for evolution of environmental governance in the conditions of EU CAP implementation. Agrarian development is associated with specific (different from other European states) environmental challenges such as degradation and contamination of farmland, pollution of surface and ground waters, loss of biodiversity, significant greenhouse gas emissions etc. That is a result of the specific institutional and governing structure evolving in the sector during the past 20 years. Implementation of the common EU policies will have unlike results in “Bulgarian” conditions enlarging income, technological, social and environmental discrepancy between different farms, sub-sectors and regions. Dominating subsistence farming, production cooperatives, small-scale commercial farms, and large business firms will be highly sustainable in years to come.mechanisms of governance; sustainable development; institutions, market, private, public and hybrid modes of governance; transaction costs; agrarian sustainability; environmental governance; Bulgaria

Dairy value chain management in Bulgaria

The dairy sector is among the most fundamentally affected by post-communist transition and EU integration of Bulgaria. This paper presents the dairy chain management in the country at current present stage of development. First, it analyses the state and forms of dairy value chain management identifying the dominant and prospective models of dairy chain management. Second, it outlines the features, factors and efficiency of a new business model of dairy farms inclusion in supply chain.value chain management; market, private and public governance; dairy sector; Bulgaria

RELATIONSHIPS BETWEEN INDUSTRIALIZED AGRICULTURE AND ENVIRONMENTAL CONSEQUENCES: THE CASE OF VERTICAL COORDINATION IN BROILERS AND HOGS

This paper examines the relationship between industrialized production in the pork and broiler industries and the natural environment. Historical perspectives are presented regarding the movement toward increasingly concentrated and coordinated pork and broiler production units in the South. The relationships between animal byproduct management and environmental quality, both at the farm level and within a geographic region, are addressed. Using the North Carolina pork industry as a background, current regulations and potential policy implications to protect environmental quality are discussed.Environmental Economics and Policy, Livestock Production/Industries,

VERTICAL INTEGRATION IN AGRICULTURE AND CONTRACT FARMING

It has been widely argued recently that agriculture is undergoing a process of vertical integration with allied industries. One of the worldwide ways of vertical integration in agriculture is contract farming. Contract farming is a continually evolving process. Worldwide applications of contract farming have shown that the terms of contracts are shaped by their own conditions and varied from product to product. Also, each country has its own experiences. Contract farming has many advantages for both producers/growers and integrators, besides some inherent disadvantages and failures regarding its implementation. Some measures, however, could be taken to outweigh these advantages for both sides. In this study, first of all, a brief history is presented along with an explanation of contract farming concepts. Secondly, the reasons behind contract farming are discussed. And, successes and failures of contract farming are analyzed based on several research works and articles. Finally a simplified model is presented for the success of private contractual arrangements in the light of evidence taken from the experiences on the world.Vertical integration, contract farming, out-grower schemes, Agribusiness,