232 research outputs found
Commutators in Completely Simple Semigroups
We obtain a characterization of the binary commutator on completely simple
semigroups, using their Rees matrix representation. Consequently, we prove that
a regular semigroup is nilpotent (solvable) if and only if it is simple, and
all its -classes are nilpotent (solvable) groups
Primena vodeÄih indikatora u analizi i predviÄanju ekonomske aktivnosti Srbije
The paper presents the search for the possibilities of using the leading indicators in analyzing and forecasting the economic activity in Serbia. The leading indicators for Serbia have not been identified so far. This is why the research of possibilities of their use required considering some important theoretical and methodological issues related to the cyclical analysis of the economic activity in Serbia and identification of the cyclical indicators. These issues are as follows: the general approach to cyclical analysis, the choice of a reference series and the choice of the appropriate methodology for identification of leading indicators. As an appropriate general approach to cyclical analysis the growth cycles approach has been considered. As the reference series the monthly GDP is used. The monthly GDP has been interpolated starting with officially available quarterly data and using Boot, Feibes and Lisman (BFL) method of temporal disaggregation. The trend has been estimated using HP filter. Starting from the general approach to cyclical analysis, the methodology of OECD has been proposed as the appropriate for identification of leading indicators for Serbia. The methodology of OECD is presented and the possibilities of using that methodology for Serbia have been considered. Finally, the possibilities of using the leading indicators in Serbia have been researched.Rad istražuje moguÄnosti primene vodeÄih indikatora u analizi i predviÄanju ekonomske aktivnosti Srbije. VodeÄi indikatori za Srbiju joÅ” uvek nisu identifikovani, tako da je ispitivanje moguÄnosti primene vodeÄih indikatora zahtevalo razmatranje odreÄenih teorijskih i metodoloÅ”kih pitanja koja su u vezi sa cikliÄnom analizom ekonomske aktivnosti Srbije i identifikacijom vodeÄih indikatora. Ova pitanja bila su: razmatranje opÅ”teg pristupa cikliÄnoj analizi, izbor referentne serije, izbor odgovarajuÄe metodologije za identifikaciju vodeÄih indikatora. Kao odgovarajuÄi opÅ”ti pristup cikliÄnoj analizi ekonomske aktivnosti, odreÄen je pristup ciklusa rasta. Kao referentna serija u radu je koriÅ”Äen meseÄni bruto domaÄi proizvod, koji je dobijen vremenskom dezagregacijom zvaniÄno raspoloživih kvartalnih podataka za bruto domaÄi proizvod na osnovu BFL metoda (Boot-Feibes-Lisman) vremenske dezagregacije vremenskih serija, pri Äemu je za identifikaciju trenda koriÅ”Äen HP (Hodrick-Prescott) filter. PolazeÄi od opÅ”teg pristupa cikliÄnoj analizi, kao odgovarajuÄa metodologija za identifikaciju vodeÄih indikatora za Srbiju, predložena je metodologija OECD-a. Predstavljena je metodologija OECD-a i razmotrene su moguÄnosti primene ove metodologije za Srbiju. Na kraju, istražene su moguÄnosti primene vodeÄih indikatora za Srbiju
A new virtual team competence defining model
Virtual team members need to acquire specific competencies to ensure team success. In line with this, by establishing standards for selection the virtual team members can provide their successful performance that achieves organisational goals. The article
focuses on a variety of factors that affect the professional competencies in virtual teams. It also suggests models for measuring such competencies. The authors also present an example of how the model may be applied. Namely, in case study this article focuses upon the capacities of a virtual organisation to form the project team
the members of which will come from a virtual university, on the basis of knowledge and collaboration. Conclusion and recommendation are made for further research and improvements in this area
Izbor kriterijuma za odluÄivanje u uslovima rizika
Normative decision theory has developed a large number of decision-making criteria that may be used in the decision-making process in circumstances of risk. How to choose the adequate one for the given problem situation? The choice of an adequate decision making criterion requires the knowledge of criteria, their features, and the possibility of their utilization in different situations. In this study, a criteria analysis is also suggested, from the aspect of consistency with the aim to be achieved and with the features of the decision problem, from the aspect of ability to achieve rationality and from the point of view of the acceptability of consequences the change of the criterion will produce. The requirements set upon the decision-maker by the normative theory in the aspect of respecting axioms for rational choice and the maximization principle are also presented. The criteria analysis requires the usage of the results of the descriptive decision theory research as well, which, due to the bounded rationality of the decision-maker, questions the abilities of the criterion to keep to the axioms of rationality and provide maximization.Normativna teorija odluÄivanja razvila je veliki broj kriterijuma koji se mogu koristiti u procesu odluÄivanja u uslovima rizika. Kako meÄu njima odabrati odgovarajuÄi kriterijum za odluÄivanje u datoj problemskoj situaciji? Izbor odgovarajuÄeg kriterijuma zahtevaÄe poznavanje kriterijuma za odluÄivanje, njihovih karakteristika i moguÄnosti primene u razliÄitim situacijama odluÄivanja. U radu se, takoÄe, predlaže i analiza kriterijuma s aspekta konzistentnosti sa ciljem koji se želi postiÄi i karakteristikama problemske situacije, s aspekta moguÄnosti postizanja racionalnosti, kao i sa stanoviÅ”ta prihvatljivosti posledica koje Äe primena kriterijuma izazvati. Izloženi su i zahtevi koje normativna teorija postavlja donosiocu odluka u vezi sa poÅ”tovanjem aksioma racionalnog izbora i principa maksimizacije. Analiza kriterijuma zahtevaÄe koriÅ”Äenje i rezultata istraživanja deskriptivne teorije odluÄivanja, koja, usled ograniÄene racionalnosti donosioca odluke, dovodi u pitanje moguÄnosti kriterijuma da se do kraja ispoÅ”tuju aksiomi racionalnosti i obezbedi maksimizacija
The use of information and communication technologies by enterprises in the European Union member countries
The paper analyzes the use of information and communication technologies (ICT) in enterprises in the
European Union member states. The objectives of the analysis were to examine the level reached in the
application of ICT in European enterprises and explore the differences in ICT usage that exist between the
EU member states. The analysis is based on the Eurostat data on ICT usage in enterprises in the European
Union countries (EU-28) for the years 2018 and 2017. The following indicators of ICT usage were analyzed:
fixed broadband access, the speed of the internet connections, the presence of the Internet (enterprises
having a website), the use of social media, the use of cloud computing services, e-commerce indicators
(the share of the enterprises making e-sales and the share of e-commerce in the total turnover) and the
indicators of e-business integration - the share of the enterprises using enterprise resource planning
(ERP), customer relationship management (CRM) and the supply chain management (SCM) software
applications. A comparative analysis of the EU countries by the value of these indicators was carried out.
The main focus in the analysis was to identify the factors that influence the difference in the value of the
ICT indicators between the countries. The analysis has shown that the regional position, the geographic
characteristics, the size of the country and the level of its economic development are the factors that
influence these differences.U radu se analizira primena informaciono-komunikacionih tehnologija (IKT) u preduzeÄima u zemljama Älanicama Evropske unije (EU). Ciljevi analize bili su da se ispita dostignuti nivo u primeni IKT u preduzeÄima i da se istraže razlike u koriÅ”Äenju IKT koje postoje meÄu zemljama Älanicama EU. U analizi su koriÅ”Äeni podaci EUROSTAT-a o primeni IKT u preduzeÄima Evropske unije (EU-28) za 2017. i 2018. Analizirani su sledeÄi indikatori primene IKT u preduzeÄima: Å”irokopojasna internet konekcija, brzina internet konekcije, prisustvo na internetu (posedovanje Web sajta), koriÅ”Äenje druÅ”tvenih medija, koriÅ”Äenje cloud raÄunarstva, indikatori e-trgovine (udeo preduzeÄa koja prodaju svoje proizvode preko interneta i uÄeÅ”Äe e-trgovine u ukupnom prometu), i indikatori integrisanosti e-poslovanja (udeo preduzeÄa koja koriste integralni poslovni software, software za upravljanje odnosima sa klijentima i softver za upravljanje lancem snabdevanja). IzvrÅ”ena je komparativna analiza zemalja EU po vrednosti ovih indikatora, sa ciljem da se utvrdi koji faktori utiÄu na razlike u vrednosti indikatora meÄu zemljama. Analiza je pokazala da su regionalni položaj, geografske karakteristike, veliÄina zemlje i dostignut nivo ekonomskog razvoja faktori koji utiÄu na ove razlike
The use of information and communication technologies by enterprises in the European Union member countries
The paper analyzes the use of information and communication technologies (ICT) in enterprises in the
European Union member states. The objectives of the analysis were to examine the level reached in the
application of ICT in European enterprises and explore the differences in ICT usage that exist between the
EU member states. The analysis is based on the Eurostat data on ICT usage in enterprises in the European
Union countries (EU-28) for the years 2018 and 2017. The following indicators of ICT usage were analyzed:
fixed broadband access, the speed of the internet connections, the presence of the Internet (enterprises
having a website), the use of social media, the use of cloud computing services, e-commerce indicators
(the share of the enterprises making e-sales and the share of e-commerce in the total turnover) and the
indicators of e-business integration - the share of the enterprises using enterprise resource planning
(ERP), customer relationship management (CRM) and the supply chain management (SCM) software
applications. A comparative analysis of the EU countries by the value of these indicators was carried out.
The main focus in the analysis was to identify the factors that influence the difference in the value of the
ICT indicators between the countries. The analysis has shown that the regional position, the geographic
characteristics, the size of the country and the level of its economic development are the factors that
influence these differences.U radu se analizira primena informaciono-komunikacionih tehnologija (IKT) u preduzeÄima u zemljama Älanicama Evropske unije (EU). Ciljevi analize bili su da se ispita dostignuti nivo u primeni IKT u preduzeÄima i da se istraže razlike u koriÅ”Äenju IKT koje postoje meÄu zemljama Älanicama EU. U analizi su koriÅ”Äeni podaci EUROSTAT-a o primeni IKT u preduzeÄima Evropske unije (EU-28) za 2017. i 2018. Analizirani su sledeÄi indikatori primene IKT u preduzeÄima: Å”irokopojasna internet konekcija, brzina internet konekcije, prisustvo na internetu (posedovanje Web sajta), koriÅ”Äenje druÅ”tvenih medija, koriÅ”Äenje cloud raÄunarstva, indikatori e-trgovine (udeo preduzeÄa koja prodaju svoje proizvode preko interneta i uÄeÅ”Äe e-trgovine u ukupnom prometu), i indikatori integrisanosti e-poslovanja (udeo preduzeÄa koja koriste integralni poslovni software, software za upravljanje odnosima sa klijentima i softver za upravljanje lancem snabdevanja). IzvrÅ”ena je komparativna analiza zemalja EU po vrednosti ovih indikatora, sa ciljem da se utvrdi koji faktori utiÄu na razlike u vrednosti indikatora meÄu zemljama. Analiza je pokazala da su regionalni položaj, geografske karakteristike, veliÄina zemlje i dostignut nivo ekonomskog razvoja faktori koji utiÄu na ove razlike
Primena vodeÄih indikatora u analizi i predviÄanju ekonomske aktivnosti Srbije
The paper presents the search for the possibilities of using the leading indicators in analyzing and forecasting the economic activity in Serbia. The leading indicators for Serbia have not been identified so far. This is why the research of possibilities of their use required considering some important theoretical and methodological issues related to the cyclical analysis of the economic activity in Serbia and identification of the cyclical indicators. These issues are as follows: the general approach to cyclical analysis, the choice of a reference series and the choice of the appropriate methodology for identification of leading indicators. As an appropriate general approach to cyclical analysis the growth cycles approach has been considered. As the reference series the monthly GDP is used. The monthly GDP has been interpolated starting with officially available quarterly data and using Boot, Feibes and Lisman (BFL) method of temporal disaggregation. The trend has been estimated using HP filter. Starting from the general approach to cyclical analysis, the methodology of OECD has been proposed as the appropriate for identification of leading indicators for Serbia. The methodology of OECD is presented and the possibilities of using that methodology for Serbia have been considered. Finally, the possibilities of using the leading indicators in Serbia have been researched.Rad istražuje moguÄnosti primene vodeÄih indikatora u analizi i predviÄanju ekonomske aktivnosti Srbije. VodeÄi indikatori za Srbiju joÅ” uvek nisu identifikovani, tako da je ispitivanje moguÄnosti primene vodeÄih indikatora zahtevalo razmatranje odreÄenih teorijskih i metodoloÅ”kih pitanja koja su u vezi sa cikliÄnom analizom ekonomske aktivnosti Srbije i identifikacijom vodeÄih indikatora. Ova pitanja bila su: razmatranje opÅ”teg pristupa cikliÄnoj analizi, izbor referentne serije, izbor odgovarajuÄe metodologije za identifikaciju vodeÄih indikatora. Kao odgovarajuÄi opÅ”ti pristup cikliÄnoj analizi ekonomske aktivnosti, odreÄen je pristup ciklusa rasta. Kao referentna serija u radu je koriÅ”Äen meseÄni bruto domaÄi proizvod, koji je dobijen vremenskom dezagregacijom zvaniÄno raspoloživih kvartalnih podataka za bruto domaÄi proizvod na osnovu BFL metoda (Boot-Feibes-Lisman) vremenske dezagregacije vremenskih serija, pri Äemu je za identifikaciju trenda koriÅ”Äen HP (Hodrick-Prescott) filter. PolazeÄi od opÅ”teg pristupa cikliÄnoj analizi, kao odgovarajuÄa metodologija za identifikaciju vodeÄih indikatora za Srbiju, predložena je metodologija OECD-a. Predstavljena je metodologija OECD-a i razmotrene su moguÄnosti primene ove metodologije za Srbiju. Na kraju, istražene su moguÄnosti primene vodeÄih indikatora za Srbiju
The use of information and communication technologies by enterprises in the European Union member countries
The paper analyzes the use of information and communication technologies (ICT) in enterprises in the
European Union member states. The objectives of the analysis were to examine the level reached in the
application of ICT in European enterprises and explore the differences in ICT usage that exist between the
EU member states. The analysis is based on the Eurostat data on ICT usage in enterprises in the European
Union countries (EU-28) for the years 2018 and 2017. The following indicators of ICT usage were analyzed:
fixed broadband access, the speed of the internet connections, the presence of the Internet (enterprises
having a website), the use of social media, the use of cloud computing services, e-commerce indicators
(the share of the enterprises making e-sales and the share of e-commerce in the total turnover) and the
indicators of e-business integration - the share of the enterprises using enterprise resource planning
(ERP), customer relationship management (CRM) and the supply chain management (SCM) software
applications. A comparative analysis of the EU countries by the value of these indicators was carried out.
The main focus in the analysis was to identify the factors that influence the difference in the value of the
ICT indicators between the countries. The analysis has shown that the regional position, the geographic
characteristics, the size of the country and the level of its economic development are the factors that
influence these differences.U radu se analizira primena informaciono-komunikacionih tehnologija (IKT) u preduzeÄima u zemljama Älanicama Evropske unije (EU). Ciljevi analize bili su da se ispita dostignuti nivo u primeni IKT u preduzeÄima i da se istraže razlike u koriÅ”Äenju IKT koje postoje meÄu zemljama Älanicama EU. U analizi su koriÅ”Äeni podaci EUROSTAT-a o primeni IKT u preduzeÄima Evropske unije (EU-28) za 2017. i 2018. Analizirani su sledeÄi indikatori primene IKT u preduzeÄima: Å”irokopojasna internet konekcija, brzina internet konekcije, prisustvo na internetu (posedovanje Web sajta), koriÅ”Äenje druÅ”tvenih medija, koriÅ”Äenje cloud raÄunarstva, indikatori e-trgovine (udeo preduzeÄa koja prodaju svoje proizvode preko interneta i uÄeÅ”Äe e-trgovine u ukupnom prometu), i indikatori integrisanosti e-poslovanja (udeo preduzeÄa koja koriste integralni poslovni software, software za upravljanje odnosima sa klijentima i softver za upravljanje lancem snabdevanja). IzvrÅ”ena je komparativna analiza zemalja EU po vrednosti ovih indikatora, sa ciljem da se utvrdi koji faktori utiÄu na razlike u vrednosti indikatora meÄu zemljama. Analiza je pokazala da su regionalni položaj, geografske karakteristike, veliÄina zemlje i dostignut nivo ekonomskog razvoja faktori koji utiÄu na ove razlike
StatistiÄki pokazatelji korupcije u javnom sektoru u Srbiji
The paper presents statistical indicators of corruption in public sector: The World Bank's aggregate indicator Control of Corruption and The Corruption Perception Index calculated by Transparency International. The values of those indicators for Serbia are given year by year, and the methodology of their construction is presented in brief. The other sources of statistical data about corruption in Serbia are also presented: the data which compile The Statistical office of the Republic of Serbia, those of The Public Prosecution of the Republic of Serbia, internal sources of data of domestic institutions, and public opinion surveys. It was pointed out that it is very difficult to assess the real level of corruption in Serbia, especially in public sector, on the basis of available data from those sources. The progress in the fight against corruption in Serbia is evaluated by The Council of Europe and The European Commission as slow on the basis of those data, the values of The Corruption Perception Index and on the basis of some additional information's. Perhaps the results of those evaluations would have been different if the data had been complete, updated, and if some domestic indicators of corruption or methods of evaluation had been constructed.U radu su predstavljeni statistiÄki pokazatelji korupcije u javnom sektoru: agregatni indikator Kontrola korupcije Svetske banke i Indeks percepcije korupcije koji izraÄunava Transparency International. Vrednosti ovih indikatora za Srbiju su date po godinama i ukratko je predstavljena metodologija njihove konstrukcije. Predstavljeni su i drugi izvori statistiÄkih podataka o korupciji u Srbiji: podaci RepubliÄkog zavoda za statistiku Srbije, podaci RepubliÄkog javnog tužilaÅ”tva, interni izvori podataka domaÄih institucija i istraživanja javnog mnjenja o korupciji. Ukazano je na Äinjenicu da je na osnovu raspoloživih podataka iz ovih izvora teÅ”ko utvrditi stvarni nivo korupcije u Srbiji, naroÄito u javnom sektoru. Na bazi podataka iz nabrojanih izvora, vrednosti Indeksa percepcije korupcije i na osnovu dodatnih informacija, napredak u borbi protiv korupcije u Srbiji je ocenjen kao spor od strane Saveta Evrope i Evropske komisije. Možda bi rezultati evaluacije napretka bili drugaÄiji da su podaci bili potpuniji, da su ažurirani i da postoje domaÄi indikatori korupcije ili metode evaluacije progresa u borbi protiv korupcije
Investigations of time and economic dimensions of the complex product production cycle
Obeležja savremene proizvodnje sa vrhunskom organizacijom i metodama upravljanja zasnivaju se na naÄelima ekonomije vremena i principima nove proizvodne filozofije-lean production. Proizvodnju treba organizovati po principu usisavanja, sa minimalnim zalihama, radeÄi samo ono Å”to je stvarno potrebno, ni prerano ni prekasno. U radu je prikazan postupak projektovanja i rezultati istraživanja proizvodnog ciklusa složenog proizvoda koji se nalazi u proizvodnom programu kompanije 'Sloboda' ÄaÄak.The features of contemporary production process of top organization and management methods are grounded on the principles of economies of times and the principles of lean production, a new philosophy of production. Production should be organized according to the push-pull principle, with minimum inventories, manufacturing only what is really necessary, neither too early, nor too late. The paper presents the design procedure and results of investigations on the production cycle of a complex product included in the production program of 'Sloboda' - ÄaÄak Co
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