Application of collective knowledge diffusion in a social network environment

ABSTRACT

We present a group dynamics model that shows knowledge integration as a process occurring over time. As each individual in the group contact others, his own knowledge changes, and over time the collective knowledge is obtained. This allows modeling knowledge diffusion in a social network and while the models presented in this paper are not competitive in that area, they approach the problem from previously unconsidered direction. We test the behavior of the model in a multi-agent simulation and we test a simple advertisement campaign in a social network. We provide discussion of elements needed for making model more competitive.     

Working capital (mis)management – impact of executive age

Several recent studies have used the upper echelons theory to explain the impact of personal traits of top executives on various corporate policies. In this, first of its kind, study we find that older executives invest more in working capital; take longer to convert inventories to cash; and pay their suppliers sooner. These findings are consistent with the argument that risk aversion increases with executive age. Our findings indicate that executive age has significant bearing on working capital management policies. This study also initiates new avenues in research relating behavioral aspect of executives with short‐term financial management.     

MONETARY POLICY IN A NON‐REPRESENTATIVE AGENT ECONOMY: A SURVEY

It is well known that central bank policies affect not only macroeconomic aggregates, but also their distribution across economic agents. Similarly, a number of papers demonstrated that heterogeneity of agents may matter for the transmission of monetary policy to macro variables. Despite this, the mainstream monetary economics literature has so far been dominated by dynamic stochastic general equilibrium models with representative agents. This paper aims to tilt this imbalance towards heterogeneous agents setups by surveying the main positive and normative findings of this line of the literature, and suggesting areas in which these models could be implemented. In particular, we review studies that analyse the heterogeneity of (i) households’ income, (ii) households’ preferences, (iii) consumers’ age, (iv) expectations and (v) firms’ productivity and financial position. We highlight the results on issues that, by construction, cannot be investigated in a representative agent framework and discuss important papers modifying the findings from the representative agent literature.     

Internationalisation and Economic Performance of Enterprises: Evidence from Polish Firm‐level Data

This article provides evidence on the relative performance of internationalised firms using Polish firm‐level data, spanning the period 1996–2005 and covering all medium and large enterprises. We distinguish between three modes of internationalisation: foreign direct investment, exporting and importing of capital goods. Our results point strongly at the superior performance of foreign affiliates vs domestic firms, exporters vs non‐exporters, and importers vs non‐importers: internationalised firms are larger, more capital intensive, pay higher wages and are more productive than purely domestic firms. Foreign ownership is the strongest factor accounting for gains from internationalisation. The premia from exporting are substantially lower, though also significantly positive. The performance of capital goods importers is also higher compared to non‐importers and is to some extent related to their involvement in other types of international activity. The results are robust to the choice of specification and productivity estimator. The analysed enterprises recorded a sizeable and broad‐based productivity improvement over the period under consideration. Not only the initial levels of productivity of exporters, importers and foreign affiliates were on average significantly higher that those of their non‐internationalised counterparts, but they also recorded faster productivity gains (manifested in increasing productivity premia), so that the discrepancies grew even larger. We also perform the analysis of productivity spillovers from internationalised firms onto own, downstream and upstream sectors. We find evidence of significant horizontal and backward spillovers from all three types of international activity. Our results suggest that trade externalities are rather of a horizontal nature, while those related to foreign direct investment operate mainly via backward linkages.     

Knowledge integration via the fusion of the data models used in automotive production systems

ABSTRACT

In this paper a novel information model that can be used in Manufacturing Execution Systems is presented. The model is based on the fusion of ISA95, AML and OPC UA. ISA95 is used to define, unify and describe the details of a product and production technology. It also enables communication with ERP systems. The AML standard allows information about the production facilities to be presented. The OPC UA address space represents different parts of an information model while the OPC communication protocol enables it to be linked to actual production systems. The proposed concept is illustrated using an actual example of a production line for electronic devices.     

Technical Analysis as a Rational Tool of Decision Making for Professional Traders

The psychological background of technical analysis usage is investigated to further explain the popularity and common usage of technical analysis as an investment decision tool. Attitudes toward technical analysis of professional futures market traders and neophyte investors, represented by finance students, were examined. Technical analysis is one of the most popular methods supporting investment decisions and it is much more popular among future market traders than among neophyte investors. The concept of processing information was used to explain this phenomenon. Neophyte investors are more experiential and intuition-driven while using technical analysis models, while futures market traders are more rationally driven. Technical analysis methods help professional traders on futures markets, which are less transparent than regulated stock markets, to process information; those methods are perceived by them as rational, cognitive tools supporting their decision making.     

Productivity, innovation and ICT in Old and New Europe

This paper investigates the productivity performance of CEE countries vis-à-vis the EU-15 during the 1990s to detect sources of convergence between the two regions. The paper shows that changes in labour intensity have been an important source of productivity convergence during the 1990s, and are likely to remain so in the near future. It is also found that despite lower income levels, ICT capital in the CEE-10 has contributed as much to labour productivity growth as in the EU-15. Industry analysis shows that manufacturing industries that have invested heavily in ICT have been key to the restructuring process. As such ICT may therefore have been an important source of growth but probably temporary source of convergence. In the longer run the impact of ICT on growth will have to come primarily from its productive use in services. The paper therefore includes a New Economy Indicator that reflects the existence of conducive environment for continued ICT investment and diffusion. It shows that further reforms are much needed for CEE countries to enter a second convergence phase in the coming decades.This paper is written as part of a project on Information & Communication Technologies as Drivers of Economic Development in Post-Communist Countries sponsored by USAid (Grant No. 220/001.6). The industry data for the EU-15 (section 4) are updated estimates derived from a study sponsored by DG Enterprise of the European Union (OMahony and van Ark 2003). We are grateful to Robert Inklaar and Edwin Stuivenwold for statistical assistance, and to various commentators on this paper at seminars and workshops. We benefited in particular from comments by Bart Los and Marcel Timmer. The authors are solely responsible for the results presented and any remaining omissions.     

A method for knowledge integration of ontology-based user profiles in personalised document retrieval systems

ABSTRACT

The development of the Internet exceeds the ways to obtain information. Nowadays, a user is overloaded by information from every domain. In our work, we consider a Personalised Document Retrieval System that gathers information about user interests, determines a user profile and helps the user to obtain relevant documents. The scope of the paper is to develop techniques for integrating knowledge about a group of users and determining a profile that represents the group. Such a profile is then used to avoid 'cold-start' problem in a personalisation system. Experimental evaluations were performed to check the effectiveness of the system.     

Model simplification and variable selection: A replication of the UK inflation model by Hendry (2001)

In this paper, we revisit the well-known UK inflation model by Hendry (Journal of Applied Econometrics, 2001, 16, 255–275. We replicate the results in a narrow sense using the gretl and PcGive programs. In a wide sense, we extend the study of model uncertainty using the Bayesian averaging of classical estimates (BACE) approach as an automatic model reduction strategy. We consider three different specifications to compare BACE variable selection with Hendry's reduction. We find that the BACE method can recover the path of nontrivial reduction strategy.