Full Newton-Step Interior-Point Method for Linear Complementarity Problems

In this paper we consider an Infeasible Full Newton-step Interior-Point Method (IFNS-IPM) for monotone Linear Complementarity Problems (LCP). The method does not require a strictly feasible starting point. In addition, the method avoids calculation of the step size and instead takes full Newton-steps at each iteration. Iterates are kept close to the central path by suitable choice of parameters. The algorithm is globally convergent and the iteration bound matches the best known iteration bound for these types of methods

Simulation of linear business processes

Business processes are applied in business organizations, with interconnected and interactively working activities, which convert input into output elements. These are sets of linked and structured activities or tasks that create a specific process outcome. Characteristics of business processes are: definition, orderliness, user knowledge, identification of additional values for users, connection in the organizational structure and functionality of the activity. In a business activity, it is usual to differentiate business processes, production and service processes. Business Process Management focuses on workflow optimization and business process optimization, which usually includes any combination: modeling, simulation, automation, execution, verification and optimization of business activity flows to achieve the goals. Business processes in the new Six Sigma System apply process simulations, which enable rapid checking of the effectiveness and efficiency of the process, with certain levels of trust and risk. Simulation is the imitation of physical and abstract processes or systems, in the real world over time, with a developed model that represents the system itself, with the application of certain analytical and computer techniques. The best known is the computer simulation technique of linear business processes, which is quite detailed here so it can be routinely applied in practice of compressed air flow

INFEASIBLE FULL NEWTON-STEP INTERIOR-POINT METHOD FOR LINEAR COMPLEMENTARITY PROBLEMS

In this paper we consider an Infeasible Full Newton-step Interior-Point Method (IFNS-IPM) for monotone Linear Complementarity Problems (LCP). The method does not require a strictly feasible starting point. In addition, the method avoids calculation of the step size and instead takes full Newton-steps at each iteration. Iterates are kept close to the central path by suitable choice of parameters. The algorithm is globally convergent and the iteration bound matches the best known iteration bound for these types of methods

Research of the influence of socio-economic conditions of work on results of business operations of hotel enterprises

The aim of the research is to examine the correlation between the socioeconomic variables of employees (gender, age, level of education, monthly personal income of respondents and monthly personal income of the respondent household, number of members in the household and number of household members who generate income) and opinion of the respondents on the influence of the activities of the presumed on their work and the work of other employees in their hotel, opinions on the satisfaction of dense services, and opinions on the rational use of natural resources by their hotel companies. A total of 205 respondents participated in the survey, out of which 17 questionnaires did not meet the criteria for further analysis, while 188 questionnaires were further analyzed, 120 of them (63.8%) male and 68 respondents (36.2%) female sex. The T-test shows that respondents have different opinions about the services provided to guests and whether they meet their expectations. Namely, men are more satisfied than women in terms of the opinion that guests are satisfied with their work. Also, the obtained results show that more educated men with higher personal monthly income consider that their hotel has a good image of guests, partners and the public, but other groups of respondents. On the basis of the obtained results, it is concluded that the linear combination of predictors used is shown to be significant for predicting all the dependent variables that were examined by the respondents' opinion

Herpesviruses in Periapical Pathoses: An Updated Systematic Review

Apical periodontitis represents a chronic inflammation and destruction of periradicular tissue caused by polymicrobial infection of endodontic origin. The aim of this systematic review was to make an update on findings related to Epstein-Barr virus (EBV) and human cytomegalovirus (HCMV) presence in periapical pathoses and to correlate these findings with clinical, histopathological and radiographic features of periapical lesions. Methods were based on the preferred reporting items for systematic reviews and meta-analyses (PRISMA) statement. A search was performed using PubMed, Web of Science and SCOPUS. Search key words included the following medical subjects heading terms: (periapical disease OR apical periodontitis OR periapical lesions OR periapical abscess) AND (viruses OR herpesvir*). A manual search involved references from articles retrieved for possible inclusion. The search, evaluation, and critical appraisal of articles were performed by two independent judges. Collected data were analyzed using the measures of descriptive statistics. The final review has included twenty nine articles related to herpesviral presence periapical pathoses. Qualitative analysis indicated that EBV HCMV, and HHV-8 were the most prevalent species in periapical pathoses. Our findings suggest that there is wide variety of herpesviruses detection rates in periapical pathoses in relation to their clinical, histopathological and radiographic features

Antimicrobial Effect of Different Intracanal Dressings in Endodontic Treatment

Na četiri hranilišta kontaktnim testom in vitro ispitan je utjecaj pet različitih intrakanalnih medikamentoznih uložaka: kalcij-hidroksida, klorheksidin glukonata u obliku gela 1% i otopine 0,2%, paraklorfenolkamfora i 1% metronidazola. Mikroorganizmi kojima se arteficijalno inficirao korijenski kanal 40 ispitanih ekstrahiranih zuba bile su: Pseudomonas aeruginosa, Staphylococcus aureus i Candida albicans. Rezultati su pokazali znatne razlike među utjecajima pet ispitanih intrakanalnih uložaka na brojnost mikroorganizama P. aeruginosa nakon tri i sedam dana (p < 0,05) te C. albicans nakon tri dana (p < 0,05). Preparati na temelju kalcij-hidroksida i paraklorfenolkamfora imaju veliku antimikrobnu učinkovitost. Paraklorfenolkamfor je znatno reducirao broj svih ispitanih mikroorganizama P. aeruginosa i C. albicans, nakon tri i nakon sedam dana u usporedbi s ostalim materijalima (p < 0,05). Kalcijev hidroksid je pokazao isti učinak na P. aeruginosa kao i paraklorfenomkamfor, s obzirom na to da je djelovao nakon tri dana (p < 0,05). Klorheksidin gel je imao najslabije antibakterijsko djelovanje na P. aeruginosa nakon tri dana u odnosu prema svim ispitanim materijalima, ali njegovo antibakterijsko djelovanje nakon sedam dana bilo je statistički znatno veće u usporedbi s ostalim materijalima (p < 0,05), osim paraklorfenokamfora. Svi testirani materijali imali su dobar antimikotski učinak na C. albicans, osim metronidazola koji - kao što se i očekivalo - uopće nije djelovao na gljivu (p < 0,05). Može se zaključiti da klorheksidin gel povećava antibakterijsko djelovanje s duljinom primjene, a paraklorfenolkamfor i kalcij-hidroksid pokazuju najbrže i najjače antimikrobno djelovanje.The effect of five intracanal dressings, calcium hydroxide, chlorhexidine gluconate (1% gel and 0.2% solution), camphorated parachlorphenole and 1% metronidazole was tested in vitro in four media. The canals of 40 test teeth were artificially infected with Pseudomonas aeruginosa, Staphylococcus aureus and Candida albicans. Significant differences were observed between five intracanal dressings regarding the number of P. aeruginosa after 3 and 7 days (p < 0.05) and C. albicans after 3 days (p < 0.05). Specimens with calcium hydroxide and camphorated parachlorphenole have significant antibacterial efficacy. Camphorated parachlorphenole has significantly reduced the number of all tested microorganisms P. aeruginosa and C. albicans after 3 and 7 days in comparison with other materials (p < 0.05). Calcium hydroxide has shown similar effect on P. aeruginosa as camphorated parachlorphenole regarding the efficacy after 3 days (p < 0.05). Chlorhexidine gel has shown the weakest efficacy on P. aeruginosa after 3 days, compared to all tested materials, but its antibacterial efficacy after 7 days was statistically greater compared to other materials (p < 0.05), except for camphorated parachlorphenole. All tested materials had good antimycotic efficacy against C. albicans except metronidazole that, as was expected, had no efficacy against yeast (p < 0.05). We can conclude that the antibacterial efficacy of chlorhexidine gel is enhanced with time, while camphorated parachlorphenole and calcium hydroxide have fastest and strongest antimicrobial efficacy

Antimicrobial Effect of Different Intracanal Dressings in Endodontic Treatment

Na četiri hranilišta kontaktnim testom in vitro ispitan je utjecaj pet različitih intrakanalnih medikamentoznih uložaka: kalcij-hidroksida, klorheksidin glukonata u obliku gela 1% i otopine 0,2%, paraklorfenolkamfora i 1% metronidazola. Mikroorganizmi kojima se arteficijalno inficirao korijenski kanal 40 ispitanih ekstrahiranih zuba bile su: Pseudomonas aeruginosa, Staphylococcus aureus i Candida albicans. Rezultati su pokazali znatne razlike među utjecajima pet ispitanih intrakanalnih uložaka na brojnost mikroorganizama P. aeruginosa nakon tri i sedam dana (p < 0,05) te C. albicans nakon tri dana (p < 0,05). Preparati na temelju kalcij-hidroksida i paraklorfenolkamfora imaju veliku antimikrobnu učinkovitost. Paraklorfenolkamfor je znatno reducirao broj svih ispitanih mikroorganizama P. aeruginosa i C. albicans, nakon tri i nakon sedam dana u usporedbi s ostalim materijalima (p < 0,05). Kalcijev hidroksid je pokazao isti učinak na P. aeruginosa kao i paraklorfenomkamfor, s obzirom na to da je djelovao nakon tri dana (p < 0,05). Klorheksidin gel je imao najslabije antibakterijsko djelovanje na P. aeruginosa nakon tri dana u odnosu prema svim ispitanim materijalima, ali njegovo antibakterijsko djelovanje nakon sedam dana bilo je statistički znatno veće u usporedbi s ostalim materijalima (p < 0,05), osim paraklorfenokamfora. Svi testirani materijali imali su dobar antimikotski učinak na C. albicans, osim metronidazola koji - kao što se i očekivalo - uopće nije djelovao na gljivu (p < 0,05). Može se zaključiti da klorheksidin gel povećava antibakterijsko djelovanje s duljinom primjene, a paraklorfenolkamfor i kalcij-hidroksid pokazuju najbrže i najjače antimikrobno djelovanje.The effect of five intracanal dressings, calcium hydroxide, chlorhexidine gluconate (1% gel and 0.2% solution), camphorated parachlorphenole and 1% metronidazole was tested in vitro in four media. The canals of 40 test teeth were artificially infected with Pseudomonas aeruginosa, Staphylococcus aureus and Candida albicans. Significant differences were observed between five intracanal dressings regarding the number of P. aeruginosa after 3 and 7 days (p < 0.05) and C. albicans after 3 days (p < 0.05). Specimens with calcium hydroxide and camphorated parachlorphenole have significant antibacterial efficacy. Camphorated parachlorphenole has significantly reduced the number of all tested microorganisms P. aeruginosa and C. albicans after 3 and 7 days in comparison with other materials (p < 0.05). Calcium hydroxide has shown similar effect on P. aeruginosa as camphorated parachlorphenole regarding the efficacy after 3 days (p < 0.05). Chlorhexidine gel has shown the weakest efficacy on P. aeruginosa after 3 days, compared to all tested materials, but its antibacterial efficacy after 7 days was statistically greater compared to other materials (p < 0.05), except for camphorated parachlorphenole. All tested materials had good antimycotic efficacy against C. albicans except metronidazole that, as was expected, had no efficacy against yeast (p < 0.05). We can conclude that the antibacterial efficacy of chlorhexidine gel is enhanced with time, while camphorated parachlorphenole and calcium hydroxide have fastest and strongest antimicrobial efficacy

Research and evaluation of the effectiveness of e - learning : a Linear Programming case study

U ovoj disertaciji razmatra se implementiranje e-učenja na primjeru modula lekcija iz linearnog programiranja. Nadalje, metodologija akcijskog istraživanja korištena je da bi se ispitala učinkovitost e-učenja u usporedbi s klasičnim tehnikama učenja. U prvoj fazi istraživanja kreiran je modul lekcija iz linearnog programiranja (LP) korištenjem softverskog paketa Loomen Moodle i ostalih interaktivnih softverskih paketa kao što je Geogebra. Uz klasičan sadržaj kao što je simpleks metoda, modul također sadržava poglavlje o novim metodama LP koji se nazivaju metode unutarnjih točaka (IPM). U drugoj fazi istraživanja provedena je studija o učinkovitosti e-učenja na primjeru kreiranog LP modula. LP modul predavan je kao kratki tečaj dvjema grupama učenika. Statistički neznatnom razlikom u prijašnjem znanju i prijašnjem uspjehu u prošloj školskoj godini, kao i ostalim učeničkim pokazateljima, ove dvije grupe učenika zapravo su učenici drugog razreda Gimnazije u Požegi. U projektu je sudjelovalo ukupno 60 učenika, točnije, 31 učenik iz 2. a te 29 učenika iz 2.b razreda. U 2. b razredu modul je predavan na klasičan način dok je drugoj grupi u razredu 2. a predavanje ostvareno upotrebom e-učenja. Proces učenja praćen je upotrebom metodologije akcijskog istraživanja (AIM). Napravljen je detaljan AIM plan koji uključuje pisanje dnevnika, kolekciju komentara učenika i kritičkih prijatelja i kolekciju statističkih podataka koji mjere napredak i uspjeh učenika tijekom učenja. Svrha AIM-a bila je dvostruka – u prvom redu, valjalo je pratiti izvođenje nastave, a s druge strane, nastavu je bilo potrebno dinamički unaprijediti, vezano uz komentare učenika i kritičkih prijatelja. U zadnjoj fazi istraživanja, nakon što je nastava provedena, prikupljeni su podaci analizirani i vrednovani. Statistička analiza pokazala je da je grupa učenika koja je koristila metodu e-učenja pokazala bolje rezultate nego grupa koja je koristila klasične učeničke metode. Dakle, početna teza može se formulirati na sljedeći način: ako se metodologija eučenja korektno implementira, što zahtijeva dobru pripremu i planiranje, tada će voditi boljem razumijevanju i prihvaćanju sadržaja koji se uči. Navedeno je i potvrđeno. Općenitije, ovaj projekt ističe da će investicija uvođenja informacijskih tehnologija u edukacijski proces imati značajne pomake u poboljšanju učeničkog učenja. Dakle, e-učenje trebalo bi, ali i sve više postaje integralni dio školske prakse. Međutim, uspješno uvođenje eučenja predstavlja izazov jer zahtijeva napore učenika i učitelja. Otpor učitelja može biti veći nego učenika jer učenici lakše prihvaćaju okruženje e-učenja, zato što su rasli okruženi različitim produktima informacijske tehnologije.In the thesis an implementation of the e-learning for the case of Linear Programming (LP) module of lectures is considered. Furthermore, an action research methodology was used to examine the effectiveness of e-learning approach versus classical learning techniques. At the first stage of the research, an e-learning module of LP lectures has been created using Loomen Moodle software and other interactive software used within such as Geogebra. In addition to classical material, such as Simplex Method (SM), the module contains a section on new methods in LP, called Interior-Point Methods (IPM). At the second stage of the research, a study of the effectiveness of e-learning was conducted. The LP module was taught as a short course to two groups of students with statistically insignificant differences in background knowledge, previous academic performance and other academic indicators. These two groups of students are sophomores at the Gimnazija Pozega, Pozega, Croatia. Total of 60 students participated in the project, 31 student in class 2.a and 29 students in class 2.b. In one group, class 2.b, the module was taught using classical in class teaching methods while in the other group, class 2.a, the module was taught using e-learning approach. The teaching process was monitored using Action Research Methodology (ARM). Detailed ARM plan was created and followed which included writing a diary, collection of comments from students and “critical friends”, and collection of statistical data measuring progress and success in the course. The ARM served the dual purpose, of monitoring the delivery of the course and of dynamically improving it based on the students' and critical friends comments. At the last stage of the research, after the delivery of the course, the collected data was analyzed and validated and statistical analysis was performed showing that the group of students that was taking the course using e-learning approach performed better than the group that used classical teaching approach. Hence, the initial thesis that can be formulated as follows: The e- learning methodology if implemented correctly, which requires significant preparation and planning, leads to the improved understanding, acquisition and retention of the material being taught; has been validated. On the more general note, this project reemphasizes the view that investment in incorporating information technologies in the educational process will have significant benefits in enhancing students' learning. Hence, e-learning should, and is becoming, more and more integral part of the regular school practice. However, the successful incorporation of e-learning presents a challenge because it requires careful preparation and planning, initially requiring an additional effort both from teachers and students. The resistance from teacher may be harder to overcome while students may accept e-learning environment more naturally because they have been growing up in information age surrounded by variety of information technology products