排序方式: 共有24条查询结果,搜索用时 15 毫秒
1.
Anna Ławrynowicz 《International Journal of Intelligent Systems in Accounting, Finance & Management》2006,14(1-2):59-76
A new approach to solving production management problems in the supply net is proposed. An expert system designed to help companies in medium-term and short-term production planning is discussed. The proposed expert system considers alternative process plans for a job and outsourcing, when a bottleneck exists in the machine. The proposed hybrid system uses the output of the expert system as the input of the genetic algorithm. The output of the genetic algorithm is a near optimal schedule. The proposed method does not require any unrealistic assumptions. It can be used to solve highly complicated and non-linear functions of a realistic problem. Copyright © 2007 John Wiley & Sons, Ltd. 相似文献
2.
Inter-local cooperation is difficult to measure. In Poland, however, the data-set concerning financial transfers between local government budgets (one of the most popular quantitative measures of cooperation) has never been described in scientific literature. This paper aims at contributing to fill this gap. On the basis of the budget expenditures of all Polish local governments, we applied two research methods: OLS regression and Heckman two-stage regression. The results show that the decision whether to get into cooperation, and the decision on the extent of involvement are driven by different factors. 相似文献
3.
4.
KRISTINA BLUWSTEIN MICHAł BRZOZA-BRZEZINA PAOLO GELAIN MARCIN KOLASA 《Journal of Money, Credit and Banking》2020,52(7):1691-1718
We introduce multiperiod mortgage loans, fixed interest rate, a lower bound constraint on newly granted loans, and a possibly slack collateral constraint, in an otherwise standard Dynamic Stochastic General Equilibrium (DSGE) model with housing. Our nonlinear estimation shows that all those features are important to understand the evolution of mortgage debt during the recent U.S. housing market boom and bust. The transmission of monetary policy becomes dependent on the housing cycle, with weaker effects when house prices are high or start falling sharply. Higher average loan duration makes monetary policy less effective, eventually leading to asymmetric responses to positive and negative monetary shocks. 相似文献
5.
This paper demonstrates how revealed- and stated-preference analyses can be used for modeling network effects in the field of mobile telecommunications. The aim of this study was to verify if network effects may still play a role in the Polish mobile telecommunications market, measure their strength, identify their sources and variability across consumers by accounting for consumers' observable and unobservable preference heterogeneity, evaluate their monetary value to consumers, and finally, to verify if the marginal utility associated with network effects is constant. The analysis of consumers' revealed choices (currently used mobile telephone operator) allowed the identification of major differences between customer bases of incumbent and new entrant operators, and insight into the business strategies adopted in the presence of asymmetric regulation of mobile termination rates. The second part of the study—the analysis of the consumers' stated choices (made in carefully prepared and designed hypothetical choice situations, known as the choice experiments) made it possible to directly model consumers' utility functions and, in this way, investigate the nature of network effects in mobile telecommunications markets. From the results, the presence of strong network effects, which are related to the ratio of consumers' social network group using the same operator, and to the magnitude of on-net price discounts, is confirmed. These network effects can be disaggregated to pecuniary and non-pecuniary effects. Through the utilization of the random parameters multinomial logit model, consumers' observable and unobservable preference heterogeneity can be accounted for, which proved a scientifically revealing and potentially policy-relevant approach. The results might be of a particular interest to other researchers aiming at modeling consumers' preferences as well as to mobile telephone operators and regulatory authorities—it is shown that capacity for vigorous price competition between mobile operators is limited by non-price factors, which affect subscriber's choices, especially in the presence of asymmetric mobile termination rates. 相似文献
6.
Katarzyna Blanke-Ławniczak 《国际粮食与农业综合企业市场学杂志》2013,25(2-3):134-148
The article presents a case story of the fall and rise of the food industry in Poland's transition economy, illustrated with the example of one of its most successful companies. The author distinguishes 3 stages of the economic transition of Poland: Stage 1, in which the Polish food processing industry collapsed, faced with fierce foreign competition after the implementation of a strategy of liberalization and privatization; Stage 2 (since the late 1990s), when young, dynamic, and relatively well-educated Polish entrepreneurs and managers not only started to regain the local market but also began international expansion, intensifying exports, primarily to EU markets; Stage 3, during which the internationalization took the form of foreign direct investment outward into the former neighboring socialist/communist countries. The MASPEX Group provides an excellent example of successful revival and expansion achieved thanks to the company's dynamic marketing strategy, executed by a young, dynamic, and highly professional management team. 相似文献
7.
8.
We evaluate two most popular approaches to implementing financial frictions into DSGE models: the Bernanke, Gertler, and Gilchrist ( 1999 ) setup, where frictions affect the price of loans, and the Kiyotaki and Moore ( 1997 ) model, where they concern the quantity of loans. We take both models to the data and check how well they fit it on several margins. Overall, comparing the models favors the Bernanke, Gertler, and Gilchrist framework. However, even this model does not make a clear improvement over the New Keynesian benchmark in terms of marginal likelihood and similarity of impulse responses to those obtained from a VAR. 相似文献
9.
Waldemar Tarczyński Małgorzata Łuniewska 《International Advances in Economic Research》2006,12(3):308-317
The basics of portfolio management theory and methods of efficient selection of assets and their financing have been created by Markowitz and Sharpe. They propose that risk diversification consists, generally speaking, of the increase in the number of securities in a portfolio. So, authors try to answer the question of how many securities have to be bought on a given market to assure a well-diversified portfolio, where the increase in the number of securities does not lead to a significant decrease in portfolio risk. To evaluate such a purpose on the Polish capital market, 20 companies were surveyed that are included in the WIG20 index in the period January 2–October 10, 2001. The returns were estimated on a weekly basis. The research shows that a portfolio of securities constructed, according to the Sharpe Model, has a wide application to the Polish capital market.*University of Szczecin—Poland. This paper was presented at the Fifty-Eighth InternationalAtlantic Economic Conference, October 6Y9, 2005, Chicago, U.S.A. 相似文献
10.
This paper presents some results of the simulation model of the Polish economy in transition from the planned to market one.
The simulation model is nonlinear and dynamic. It consists of 800 balance equations, 40 of which are difference state equations.
The basic time unit is one quarter while the calculation horizon spans between three and 10 years. It was calibrated to the
1994–96 statistical data. The model contains the aggregates of production (divided between the state and private sectors and
three production branches), households, public sector, banking system, and foreign trade. The simulation attempts to forecast
chosen macroeconomic variables resulting from different scenarios. Sets of effective (Pareto-optimal) solutions and effective
growth paths of economy were obtained. The simulation results help to better understand the macroeconomic process in the transition
period and can be useful for central-level decisionmakers.
This work was partially supported by grant No. 1 HO2B 023 09 from Komitet Badan Naukowych (Polish State Committee for Scientific
Research). 相似文献