Template-Type: ReDIF-Article 1.0 Author-Name: Jan Hron Author-Workplace-Name: Department of Management, Faculty of Economics and Management, Czech University of Life Sciences Prague, Prague, Czech Republic Author-Name: Tomas Macak Author-Workplace-Name: Department of Management, Faculty of Economics and Management, Czech University of Life Sciences Prague, Prague, Czech Republic Title: Economic evaluation and design of control mechanisms to determine the concentration of juices Abstract: There is a significant attention paid to food analysis in the context of authenticity monitoring in the food industry. Although this has focussed increasingly on food safety and authenticity, the agro-food sector has also instituted requirements for the product identification, differentiation and historical monitoring. For the design and evaluation of the control mechanism, here is used the common approach for the design of experiments (DOE), specifically the "full factorial" design. The uniqueness of the solution lays in a geometric interpretation of the large variability the impedance, due to the samples provided by different producers. The presented solution consisted of the linearization variable zone by the Taylor polynomial. In the next step, there was conducted fuzzification of the electric impedance to determine the mechanism for identifying of juice concentrations. Keywords: control mechanism, design of experiments, electrical impedance, food quality, net present value Journal: Agricultural Economics Pages: 539-545 Volume: 60 Issue: 12 Year: 2014 DOI: 10.17221/156/2014-AGRICECON File-URL: http://agricecon.agriculturejournals.cz/doi/10.17221/156/2014-AGRICECON.html File-Format: text/html X-File-Ref: http://agriculturejournals.cz/RePEc/caa/references/age-201412-0001.txt Handle: RePEc:caa:jnlage:v:60:y:2014:i:12:id:156-2014-AGRICECON Template-Type: ReDIF-Article 1.0 Author-Name: Jiří LÝSEK Author-Workplace-Name: Department of Informatics, Faculty of Business and Economics, Mendel University in Brno, Brno, Czech Republic Author-Name: Jiří ŠŤASTNÝ Author-Workplace-Name: Department of Informatics, Faculty of Business and Economics, Mendel University in Brno, Brno, Czech Republic Title: Automatic discovery of the regression model by the means of grammatical and differential evolution Abstract: In the contribution, there is discussed the usage of the method based on the grammatical and differential evolution for the automatic discovery of regression models for discrete datasets. The combination of these two methods enables the process to find the precise structure of the mathematical model and values for the model constants separately. The used method is described and tested on the selected regression examples. The results are reported and the obtained mathematical models are presented. The advantages of the selected approach are described and compared to the classical methods. Keywords: context-free grammar, evolutionary methods, genetic algorithm, sum of squared error Journal: Agricultural Economics Pages: 546-552 Volume: 60 Issue: 12 Year: 2014 DOI: 10.17221/160/2014-AGRICECON File-URL: http://agricecon.agriculturejournals.cz/doi/10.17221/160/2014-AGRICECON.html File-Format: text/html X-File-Ref: http://agriculturejournals.cz/RePEc/caa/references/age-201412-0002.txt Handle: RePEc:caa:jnlage:v:60:y:2014:i:12:id:160-2014-AGRICECON Template-Type: ReDIF-Article 1.0 Author-Name: Sonia BELLIT Author-Workplace-Name: INRA, Agrosup Dijon, Dijon, France CCMSA, Bagnolet, France Title: The career paths of agricultural workers: What is the impact of temporary contracts? Abstract: Agriculture, more than any other sector, is a provider of temporary jobs. The main aim of the paper is to analyze the impact of the temporary contract in agriculture on the probability of remaining employed in this sector. There is used a discrete-time competing risks duration model with two sub-samples, consisting of seasonal contracts and fixed-term contracts. The results show that while the probability of a worker finding a job increases with the number of temporary jobs already amassed in his or her career, this probability decreases with the number of interruptions in employment. There is also shown the effect of time dependence on the transition probabilities. Whether the temporary contract is seasonal or not, the risks of exiting towards non-employment are greatest for the shortest contracts, but the prospects for finding a job do improve thereafter. In the specific case of the fixed-term contract, the chances of converting this to a permanent contract are greater at the legal limit. Finally, the most highly qualified workers are those who leave the agricultural sector. Nevertheless, the risks of exiting are relatively low: agricultural jobs require a specific capital which is difficult to transfer to other sectors. Keywords: competing risks, duration dependence, multilevel, temporary employment, transition Journal: Agricultural Economics Pages: 553-569 Volume: 60 Issue: 12 Year: 2014 DOI: 10.17221/78/2014-AGRICECON File-URL: http://agricecon.agriculturejournals.cz/doi/10.17221/78/2014-AGRICECON.html File-Format: text/html X-File-Ref: http://agriculturejournals.cz/RePEc/caa/references/age-201412-0003.txt Handle: RePEc:caa:jnlage:v:60:y:2014:i:12:id:78-2014-AGRICECON Template-Type: ReDIF-Article 1.0 Author-Name: Muhammad Rizwan Yaseen Author-Workplace-Name: Government College University, Faisalabad, Pakistan Author-Name: Irfan Mehmood Author-Workplace-Name: Pakistan Agricultural Research Council, Faisalabad, Pakistan Author-Name: Qasim Ali Author-Workplace-Name: Government College University, Faisalabad, Pakistan Title: Comparative analysis of the food and nutrients demand in developing countries: The case of main vegetable products in South Asian countries Abstract: Being the most populous countries of South Asia, India, Pakistan and Bangladesh together represent about 37% of the world total undernourished population. In the article, there are calculated the expenditure elasticities and the own and cross non-compensated price elasticities of main vegetable products of these countries by using the LA-AIDS model. There are used the elasticity estimates to decompose the recent demand fluctuations into price effect, income effect and population effect for each country. Then the ways for the government to improve the protein and energy intake after calculating the vegetable protein and calories elasticities are compared. Wheat and rice in these countries are relatively price inelastic. For these three countries, the population development (as well as the revenue for India and Bangladesh) appears to be the most important and regular cause of the augmentation of demand for vegetable products. A combination of income and price policies may be more effective in influencing the consumption pattern. The government should aim at improving the income level of most vulnerable consumers (low income group) in these countries. Keywords: amelioration, expenditure elasticities, LA/AIDS, price elasticities, protein and calorie intake, vegetal food consumption Journal: Agricultural Economics Pages: 570-581 Volume: 60 Issue: 12 Year: 2014 DOI: 10.17221/28/2014-AGRICECON File-URL: http://agricecon.agriculturejournals.cz/doi/10.17221/28/2014-AGRICECON.html File-Format: text/html X-File-Ref: http://agriculturejournals.cz/RePEc/caa/references/age-201412-0004.txt Handle: RePEc:caa:jnlage:v:60:y:2014:i:12:id:28-2014-AGRICECON Template-Type: ReDIF-Article 1.0 Author-Name: editors Title: AUTHORS INDEX Journal: Agricultural Economics Pages: IV-V Volume: 60 Issue: 12 Year: 2014 DOI: 10.17221/7815-AGRICECON File-URL: http://agricecon.agriculturejournals.cz/doi/10.17221/7815-AGRICECON.html File-Format: text/html Handle: RePEc:caa:jnlage:v:60:y:2014:i:12:id:7815-AGRICECON Template-Type: ReDIF-Article 1.0 Author-Name: editors Title: List of reviewers Journal: Agricultural Economics Pages: VI Volume: 60 Issue: 12 Year: 2014 DOI: 10.17221/7814-AGRICECON File-URL: http://agricecon.agriculturejournals.cz/doi/10.17221/7814-AGRICECON.html File-Format: text/html Handle: RePEc:caa:jnlage:v:60:y:2014:i:12:id:7814-AGRICECON Template-Type: ReDIF-Article 1.0 Author-Name: editors Title: VOLUME 60, CONTENTS Journal: Agricultural Economics Pages: i-iii Volume: 60 Issue: 12 Year: 2014 DOI: 10.17221/7813-AGRICECON File-URL: http://agricecon.agriculturejournals.cz/doi/10.17221/7813-AGRICECON.html File-Format: text/html Handle: RePEc:caa:jnlage:v:60:y:2014:i:12:id:7813-AGRICECON