18,715 research outputs found

    When Mobile Blockchain Meets Edge Computing

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    Blockchain, as the backbone technology of the current popular Bitcoin digital currency, has become a promising decentralized data management framework. Although blockchain has been widely adopted in many applications, e.g., finance, healthcare, and logistics, its application in mobile services is still limited. This is due to the fact that blockchain users need to solve preset proof-of-work puzzles to add new data, i.e., a block, to the blockchain. Solving the proof-of-work, however, consumes substantial resources in terms of CPU time and energy, which is not suitable for resource-limited mobile devices. To facilitate blockchain applications in future mobile Internet of Things systems, multiple access mobile edge computing appears to be an auspicious solution to solve the proof-of-work puzzles for mobile users. We first introduce a novel concept of edge computing for mobile blockchain. Then, we introduce an economic approach for edge computing resource management. Moreover, a prototype of mobile edge computing enabled blockchain systems is presented with experimental results to justify the proposed concept.Comment: Accepted by IEEE Communications Magazin

    Product Return Handling

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    In this article we focus on product return handling and warehousingissues. In some businesses return rates can be well over 20% andreturns can be especially costly when not handled properly. In spiteof this, many managers have handled returns extemporarily. The factthat quantitative methods barely exist to support return handlingdecisions adds to this. In this article we bridge those issues by 1)going over the key decisions related with return handling; 2)identifying quantitative models to support those decisions.Furthermore, we provide insights on directions for future research.reverse logistics;decision-making;quantitative models;retailing and warehousing

    Market institutions

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    This paper examines how market institutions can affect links between urban and rural areas with specific emphasis on goods market integration in the national context.Traditionally, development researchers and practitioners have focused either on rural market development or on urban market development without considering the interdependencies and synergies between the two. However, more than ever before, emerging local and global patterns such as the modern food value-chain led by supermarkets and food processors, rapid urbanization, changes in dietary composition, and enhanced information and communication technologies point to the need to pay close attention to the role of markets both in linking rural areas with intermediate cities and market towns and promotion of economic development and poverty reduction. This paper begins with a presentation of a conceptual framework of market integration and then identifies five major factors that increase the transfer costs that subsequently hinder market integration between rural and urban areas: information asymmetry, transaction costs, transport and communication costs, policy induced barriers, and social and noneconomic factors. Five specific cases in five developing countries are examined in this study to demonstrate the primary sources of transfer costs and the aspects of market institutions that are important to market integration and promotion of rural-urban linkages.Rural-urban linkages ,

    Development of transportation and supply chain problems with the combination of agent-based simulation and network optimization

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    Demand drives a different range of supply chain and logistics location decisions, and agent-based modeling (ABM) introduces innovative solutions to address supply chain and logistics problems. This dissertation focuses on an agent-based and network optimization approach to resolve those problems and features three research projects that cover prevalent supply chain management and logistics problems. The first case study evaluates demographic densities in Norway, Finland, and Sweden, and covers how distribution center (DC) locations can be established using a minimizing trip distance approach. Furthermore, traveling time maps are developed for each scenario. In addition, the Nordic area consisting of those three countries is analyzed and five DC location optimization results are presented. The second case study introduces transportation cost modelling in the process of collecting tree logs from several districts and transporting them to the nearest collection point. This research project presents agent-based modelling (ABM) that incorporates comprehensively the key elements of the pick-up and delivery supply chain model and designs the components as autonomous agents communicating with each other. The modelling merges various components such as GIS routing, potential facility locations, random tree log pickup locations, fleet sizing, trip distance, and truck and train transportation. The entire pick-up and delivery operation are modeled by ABM and modeling outcomes are provided by time series charts such as the number of trucks in use, facilities inventory and travel distance. In addition, various scenarios of simulation based on potential facility locations and truck numbers are evaluated and the optimal facility location and fleet size are identified. In the third case study, an agent-based modeling strategy is used to address the problem of vehicle scheduling and fleet optimization. The solution method is employed to data from a real-world organization, and a set of key performance indicators are created to assess the resolution's effectiveness. The ABM method, contrary to other modeling approaches, is a fully customized method that can incorporate extensively various processes and elements. ABM applying the autonomous agent concept can integrate various components that exist in the complex supply chain and create a similar system to assess the supply chain efficiency.Tuotteiden kysyntä ohjaa erilaisia toimitusketju- ja logistiikkasijaintipäätöksiä, ja agenttipohjainen mallinnusmenetelmä (ABM) tuo innovatiivisia ratkaisuja toimitusketjun ja logistiikan ongelmien ratkaisemiseen. Tämä väitöskirja keskittyy agenttipohjaiseen mallinnusmenetelmään ja verkon optimointiin tällaisten ongelmien ratkaisemiseksi, ja sisältää kolme tapaustutkimusta, jotka voidaan luokitella kuuluvan yleisiin toimitusketjun hallinta- ja logistiikkaongelmiin. Ensimmäinen tapaustutkimus esittelee kuinka käyttämällä väestötiheyksiä Norjassa, Suomessa ja Ruotsissa voidaan määrittää strategioita jakelukeskusten (DC) sijaintiin käyttämällä matkan etäisyyden minimoimista. Kullekin skenaariolle kehitetään matka-aikakartat. Lisäksi analysoidaan näistä kolmesta maasta koostuvaa pohjoismaista aluetta ja esitetään viisi mahdollista sijaintia optimointituloksena. Toinen tapaustutkimus esittelee kuljetuskustannusmallintamisen prosessissa, jossa puutavaraa kerätään useilta alueilta ja kuljetetaan lähimpään keräyspisteeseen. Tämä tutkimusprojekti esittelee agenttipohjaista mallinnusta (ABM), joka yhdistää kattavasti noudon ja toimituksen toimitusketjumallin keskeiset elementit ja suunnittelee komponentit keskenään kommunikoiviksi autonomisiksi agenteiksi. Mallinnuksessa yhdistetään erilaisia komponentteja, kuten GIS-reititys, mahdolliset tilojen sijainnit, satunnaiset puunhakupaikat, kaluston mitoitus, matkan pituus sekä monimuotokuljetukset. ABM:n avulla mallinnetaan noutojen ja toimituksien koko ketju ja tuloksena saadaan aikasarjoja kuvaamaan käytössä olevat kuorma-autot, sekä varastomäärät ja ajetut matkat. Lisäksi arvioidaan erilaisia simuloinnin skenaarioita mahdollisten laitosten sijainnista ja kuorma-autojen lukumäärästä sekä tunnistetaan optimaalinen toimipisteen sijainti ja tarvittava autojen määrä. Kolmannessa tapaustutkimuksessa agenttipohjaista mallinnusstrategiaa käytetään ratkaisemaan ajoneuvojen aikataulujen ja kaluston optimoinnin ongelma. Ratkaisumenetelmää käytetään dataan, joka on peräisin todellisesta organisaatiosta, ja ratkaisun tehokkuuden arvioimiseksi luodaan lukuisia keskeisiä suorituskykyindikaattoreita. ABM-menetelmä, toisin kuin monet muut mallintamismenetelmät, on täysin räätälöitävissä oleva menetelmä, joka voi sisältää laajasti erilaisia prosesseja ja elementtejä. Autonomisia agentteja soveltava ABM voi integroida erilaisia komponentteja, jotka ovat olemassa monimutkaisessa toimitusketjussa ja luoda vastaavan järjestelmän toimitusketjun tehokkuuden arvioimiseksi yksityiskohtaisesti.fi=vertaisarvioitu|en=peerReviewed

    Monopolistic Competition in Distribution

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    Agriculture in the face of changing markets, institutions and policies: Challenges and strategies

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    Since the late 1980s, agriculture in Central and Eastern European Countries (CEECs) has been under considerable adjustment pressure due to changing political, economic and institutional environments. These changes have been linked to the transition process, as well as the ongoing integration into the European Union and the world market. Reduced subsidies, increased environmental and food quality demands, as well as structural changes in the supply, processing and food retailing sector call for major structural adjustments and the improvement of farmers' managerial abilities. Though such changes always carry significant threats to farms, they also offer new opportunities for the farms' entrepreneurial engagement. Upcoming changes in the agricultural environment and their possible consequences for farm structures across Europe are thus still timely subjects. The objective of the IAMO Forum 2006 is to contribute to the success of agriculture in the CEECs, as well as their neighboring countries, in today's increasingly competitive environment. Concrete questions the conference focuses on are: What are the most suitable farm organizations, cooperative arrangements and contractual forms? How to improve efficiency and productivity? Where do market niches lie and what are the new product demands? CONTENT: Preface; Jarmila Curtiss, Alfons Balmann, Kirsti Dautzenberg, Kathrin Happe. The success of gradualism: Empirical evidence from China's agricultural reform; Jikun Huang, Johan F. M. Swinnen, Scott Rozelle. Land reform and farm restructuring in Moldova, Azerbaijan and Kazakhstan: A stocktaking; David Sedik. Land market developments, imperfections, and effects in transition countries; Johan F. M. Swinnen, Pavel Ciaian, Liesbet Vranken. Farmland markets, boom/bust cycles, and farm size; Charles B. Moss, Andrew Schmitz. Duality of farm structure in transition agriculture: The case of Moldova; Zvi Lerman, Dragos Cimpoies. Organizational restructuring of the agrarian sector in Bulgaria during the pre-accession period; Julia M. Doitchinova, Ivan St. Kanchev, Albena Miteva. Governance of Bulgarian farming - Modes, efficiency, impact of EU accession; Hrabrin Bachev. Leadership may have a decisive influence on the successful transition of production cooperatives - A social capital approach; Csaba Forgács. Contractual arrangement and enforcement in transition agriculture: Theory and evidence from China; Hongdong Guo. Contractrual relationships in the Hungarian horticultural sector; Imre Ferto. Contract farming in China: Perspectives of smallholders; Hongdong Guo, Robert W. Jolly, Jianhua Zhu. Are macro policies adjusted to institutional arrangements at the micro level? Some evidence from Polish Agriculture during transition; Jan Falkowski, Dominika Milczarek. The Austrian private foundation as a legal form in farm management, with special emphasis on tax issues; Hermann Peyerl, Günter Breuer. Credit as a tool of integration between the Polish farms and buyers of their products; Alina Danilowska. Who, why and how: Problems of farmers' interest representation in Poland; Aldona Zawojska. How competitive is milk production in the Central and Eastern European countries in comparison to Western Europe? Mikhail Ramanovich, Torsten Hemme. Production and trade of animal products in selected ECO countries; Farhad Mirzaei, Olaf Heidelbach. European agriculture without direct payments - A partial equilibrium analysis; Oliver Balkhausen, Martin Banse. Measuring the degree of market power in the Ukrainian milk processing; Oleksandr Perekhozhuk, Michael Grings. Determinants of foreign direct investments in the food processing industry: An empirical analysis for Ukraine; Oksana Luka. Allocative efficiency of corporate farms in the Leningrad region; David Epstein. Pathways towards efficient levels of machinery investments needed for the sustainable development of arable farms in Bulgaria; Nikolay Naydenov. Small-scale farming in Romania - Shadow prices and efficiency; Johannes Sauer, Borbala Balint. How large is the marginal product of land in the Moscow region? Natalia Il'ina, Nikolay Svetlov. Spatial price transmission on the Turkish wheat market - An initial application; Enno-Burghard Weitzel, Ahmet Bayaner. Farm to retail price transmission on the pork market: A German-Hungarian comparison; Lajos Zoltán Bakucs, Imre Ferto, Heinrich Hockmann, Oleksandr Perekhozhuk. The nature of selected price transmissions in the agri-food chain and their consequences; Lukáš Čechura. Labor mobility in transition countries and the impact of institutions; Thomas Herzfeld, Thomas Glauben. Choosing to migrate or migrating to choose: Migration and labor choice in Albania; Carlo Azzarri, Gero Carletto, Benjamin Davis, Alberto Zezza. Rural non-farm employment in Ukraine; Oleg Nivyevskiy, Stephan von Cramon-Taubadel. Opportunities and challenges for farm household livelihood strategies: Pluriactivity in Finland and the UK; Claire Newton. Territorial aspects of enterprise development in remote rural areas of Europe; Zuzana Bednarikova, Tomas Doucha, Zdenek Travnicek. New policy approaches for rural development: The experience of two case regions in Eastern Germany; Theodor Fock --

    Agriculture in the Face of Changing Markets, Institutions and Policies: Challenges and Strategies

    Get PDF
    Since the late 1980s, agriculture in Central and Eastern European Countries (CEECs) has been under considerable adjustment pressure due to changing political, economic and institutional environments. These changes have been linked to the transition process, as well as the ongoing integration into the European Union and the world market. Reduced subsidies, increased environmental and food quality demands, as well as structural changes in the supply, processing and food retailing sector call for major structural adjustments and the improvement of farmersâ managerial abilities. Though such changes always carry significant threats to farms, they also offer new opportunities for the farms' entrepreneurial engagement. Upcoming changes in the agricultural environment and their possible consequences for farm structures across Europe are thus still timely subjects. The objective of the IAMO Forum 2006 is to contribute to the success of agriculture in the CEECs, as well as their neighboring countries, in todayâs increasingly competitive environment. Concrete questions the conference focuses on are: What are the most suitable farm organizations, cooperative arrangements and contractual forms? How to improve efficiency and productivity? Where do market niches lie and what are the new product demands? This book contains 33 invited and selected contributions. These papers will be presented at the IAMO Forum 2006 in order to offer a platform for scientists, practitioners and policy-makers to discuss challenges and potential strategies at the farm, value chain, rural society and policy levels in order to cope with the upcoming challenges. IAMO Forum 2006, as well as this book, would not have been possible without the engagement of many people and institutions. We thank the authors of the submitted abstracts and papers, as well as the referees, for their evaluation of the abstracts from which the papers were selected. In particular, we would like to express our thanks to OLIVER JUNGKLAUS, GABRIELE MEWES, KLAUS REINSBERG and ANGELA SCHOLZ, who significantly contributed to the organization of the Forum. Furthermore, our thanks goes to SILKE SCHARF for her work on the layout and editing support of this book, and to JIM CURTISS, JAMIE BULLOCH, and DÃNALL Ã MEARÃIN for their English proof-reading. As experience from previous years documents, the course of the IAMO Forum continues to profit from the support and engagement of the IAMO administration, which we gratefully acknowledge. Last but not least, we are very grateful to the Robert Bosch Foundation, the Federal Ministry of Nutrition, Agriculture and Consumer Protection (BMELV), the German Research Foundation (DFG), the Haniel Foundation and the Leibniz Institute of Agricultural Development in Central and Eastern Europe (IAMO) for their respective financial support.Agribusiness, Community/Rural/Urban Development, Farm Management, Industrial Organization, International Development, Labor and Human Capital, Land Economics/Use, Productivity Analysis,
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