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- ItemKeystroke Dynamics Authentication Using a Small Number of Samples(Technická Univerzita v Liberci, ) Čapek, Jan; Hub, Miloslav; Ekonomická fakultaThe verification of a person’s identity is very important in today’s information society, especially in e-commerce systems and directly affects user account management and administration. Although present e-commerce systems use many modern sophisticated methods of authentication, large numbers of e-commerce systems use passwords for this purpose incessantly. However, passwords are not considered be too secure because users usually do not adhere to security policies for creating and managing theirs passwords. This problem can be solved by security policies that require the user to change the password frequently, select a completely new password, and structure the password, which places additional demands on the user. The solution is a two-factor authentication where a user needs to know the right password and at the same time, he must write this password in the correct way. Indeed, many different methods for keystroke dynamics authentication exist nowadays, but unfortunately, many of them need a large number of samples to create a stable template and therefore it is impossible use them in systems whose security policy requires frequent password change. The authors suggest a completely new method for these purposes that is enough stable even with a small number of measurements to create a template. This proposed method of keystroke dynamics authentication is validated and results are compared with existing methods both over the own dataset and the existing reference datasets. The authors believe that the proposed method will simplify the management and administration of user accounts as well as their security.
- ItemInnovative Esteem: Antecedents and Relationship with Job Performance(Technická Univerzita v Liberci, ) Anwar, Ch. Mahmood; Ekonomická fakultaThis study aims to present and validate a new psychological construct, i.e. innovativeness-based self-esteem or shortly “innovative esteem” which reflects that innovative individuals evaluate their innovative capabilities to determine their significance, successfulness, and worthiness in organizations. Innovative esteem reflects attributes and capacities manifested by individual’s innovativeness specific feelings and evaluations about self. Standard procedures were followed to test construct and predictive validity for the new construct. Testing 546 paired responses from subjects working in hi-tech and R&D sectors, this study empirically identified that personal innovativeness, organization-based self-esteem, learning goal orientation, and job autonomy significantly contribute to innovative esteem in organizational setting. Test of theory of interaction revealed that learning goal orientation and job autonomy interact with each other to determine innovative esteem. In addition, this research correlated innovative esteem with employee job performance by considering it as independent index. Innovative esteem is found to be significantly and positively correlated to employee job performance. The study further applied regression analysis to strengthen the finding, and found that innovative esteem significantly predicted employee job performance in time lagged setting. To establish evidence of stability of innovative esteem over time, data were collected again after one year. The test-retest reliability correlation provided the evidence of stability of innovative esteem over time. Present study proposed that innovative works can best be performed by employees high in innovative esteem which could be further confirmed empirically. It is suggested that organizations can outperform if managers consider innovative esteem of employees along with other dispositional factors. It is further suggested that significance of innovative esteem should be explored further in personality psychology and organizational behaviour.
- ItemTransmission of Financial Stress Shocks between the USA and the Euro Area During Different Business Cycle Phases(Technická Univerzita v Liberci, ) Dajčman, Silvo; Kavkler, Alenka; Mikek, Peter; Romih, Dejan; Ekonomická fakultaThis paper examines the transmission of financial stress shocks between the USA and the euro area for recessionary and non-recessionary regimes in the shock-recipient economy. The investigated period is 1999M1–2017M11, which includes several episodes of recessionary and non-recessionary regimes, endogenously determined by the model, as well as several financial stress episodes. After testing for non-linearity, we employ a five-variable Bayesian threshold vector autoregression model using internationally compatible data for financial stress indices. Our results show significant non-linearities in the financial stress-business cycle interactions for the euro area. In comparison to the non-recessionary regime, the US financial stress shocks are more detrimental to the stability of the European financial system, output growth, and inflation in recessions. US financial stress shocks negatively affect euro area unemployment rate, but the effect is independent of the euro area industrial production growth regime. In contrast, the stability of the US financial system is not susceptible to the euro area’s financial stress shocks. However, due to trade ties, the financial stress in the euro area does lead to output contraction, while not affecting inflation and unemployment in the US. We also found that US industrial production growth and unemployment rate are susceptible to domestic financial stress shocks, more in the recessionary than non-recessionary episodes of the US economy. The results suggest a need for a careful domestic and foreign financial stress monitoring and coordination of monetary authorities. While this may profit both economic areas, this is relevant more for the European Central Bank than its US counterpart.
- ItemTargeting of Online Advertising Using Logistic Regression(Technická Univerzita v Liberci, ) Šoltés, Erik; Táborecká-Petrovičová, Janka; Šipoldová, Romana; Ekonomická fakultaRecently, the internet became the dominant medium in marketing and comparing the development of expenditures into advertising indicates the dominance of online advertising will be inevitably stronger. Internet advertising compared to traditional media advertising has plenty of advantages hence online marketing exhibits a huge expansion in recent era. To fully utilize the potential of online marketing, it is necessary to effectively target activities of relevant internet users with the real presumption they will purchase promoted products or services. The paper is focused on demographic targeting by the mean of logistic regression models. Explanatory variables in presented application are arising from affinities of internet webpages visited by particular users and areas of their interests that are identified from their online behaviour. Our paper provides binomial logistic mode whose role is to predict the gender of internet user and multinomial logistic model constructed for the estimation of age category the user may be assigned to. The only variables exploited in the model by the mean of stepwise regression are variables with significant influence. The impact of particular factors is quantified via odds ratios that are used for the identification of areas of interests typical for women, men and for considered age categories. The paper demonstrates how it is possible to utilise estimated logistic models for the estimation of probabilities that the internet user is from a target group – in our case, women aged 25–44 years old. Prediction quality of models is assessed by the set of classification measures arising from confusion matrix that is generally acceptable in machine learning. Presented analyses are conducted in statistical software SAS Enterprise Guide on data provided from the real advertising campaign. More than 160,000 statistical units enabled the confirm results gained on training dataset of a relatively huge validation dataset.
- ItemIs There a Trend of Euroization of EU Countries Still Using Their National Currencies? Trade and Invoicing(Technická Univerzita v Liberci, ) Mačí, Jan; Ekonomická fakultaSeven of the eight EU countries not yet using the euro as their legal tender undertook to adopt the common currency in the future. However, the actual moment of adoption may influence, e.g. the attitude of the population (households). Other needs for the use of the euro have a business sector that is managed considering current market conditions and opportunities. The prerequisite of this article is that within the non-EMU EU economies, due to the close ties to EMU members and the prospect of a future, albeit often uncertain, approach to the euro area, the gradual euroization of businesses takes place. Among other things, euroization should be reflected in foreign trade, namely in the currency of invoicing. Using the Eurostat data from 2010–2018 on import and export and the currency of non-EMU countries invoicing to third countries expressed in EUR, USD, national and other currencies, the links between invoicing currency, size of economies and exchange rate regime were sought. The aim was also to describe the actual trend of invoicing international trade to third countries outside the EU. According to the results of the analysis, it was found that the block of non-EMU countries rather euroizes and the importance of the national currency is rather declining. The level of growth of the share of the euro and the decline of the national currency has a different intensity for imports and different for exports. At the same time, it was found that in the case of imports in EUR and NC and exports in EUR, a possible relationship between the invoicing currency and the exchange rate regime can be identified. Last but not least, it was found that in the case of invoicing in EUR and NC (national currency), there is a relationship between the size of GDP and the invoicing currency.
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