Conducting business by using the internet has become an everyday occurrence in all spheres of economy, as well as in the tourism sector. There is an increasing number of agencies in the world that conduct their business almost completely on-line. The aim of this research was to examine what characterizes the process of implementation of electronic business with tourist agencies in Serbia on the sample of 65 companies, and whether it differs depending on certain business characteristics. For that purpose, EBusTour model was developed that consists of 14 items grouped into four categories: online communication, online promotion, impact on sales and working hours reduction vs. sales improvement. As far as tourist agencies in Serbia are concerned, the results of the application of EBusTour model show that the most common activity in this field is basic online promotion (website implementation), followed by effects on sales. The paper also investigates whether there are differences in e-business implementation in relation to the characteristics such as: years in business, the type of licence (tour operator or sales agent) and the type of market (incoming, outgoing or combined).

The paper describes the procedure for parameter tuning of the power system stabilizer, as part of the structure of the automatic voltage regulator of synchronous generator AVR. Parameter tuning is based on a method that uses a mathematical model of synchronous generator on the power system. The parameters of the mathematical model of synchronous generator are determined by identification. Application of the identified mathematical model defines the function of dependence of the characteristics of the voltage regulator of the synchronous generator to the parameters of the controller. Developed method for parameter tuning is tested on the real laboratory system.

The rapid development of  information and communications technology (I.C.T) in recent decades has resulted not only in drastic increase in speed of the information flow, but also in the number of users of mobile devices. This trend has been recognized and used by many industries, including tourism. The use of specialized application software, compatible with the modern "smartphones", the interaction between tourists and tourist destinations received a whole new dimension. This article aims at analyzing the ways in which the two seemingly incompatible concepts - tourism in protected nature and advanced communication technologies - can complement each other in order to create, improve and promote ecotourism products. Furthermore, it will analyze the latest trends in the development of mobile applications used in tourism industry and present examples of good practice in protected areas in Serbia and abroad. Due to the fact that mobile applications and technological innovations are relatively new and so far very few researchers have involved in the research of their effects on the users' satisfaction and their behavior, this paper will give guidelines for future research on this topic. Keywords: Mobile Apps, Tourism, Protected areas

s of Croatian Periodontology Days 2015 congress Zagreb, Croatia, April 10-11, 2015 Predsjednik • President:

Aim: Aggressive periodontitis (AgP) is a severe, rapidly progressive form of periodontitis, which occurs in early age with specific tendency of manifesting within families. It is characterized by rapid loss of CAL and surrounding bone. Generalized form of AgP usually affects people under 35 years of age. Bone destruction and attachment loss are affecting at least 3 permanent teeth other than the first incisors and molars. Endo-paro lesions are relatively frequent complications with this type of periodontitis. When one of these two tissues is infected, microorganisms circulate between them, and infections from one tissue may cause pathology of another or exacerbate the current disease. Material and Methods: 26-year old female with clinical and radiographic evidence of severe attachment loss and bone destruction is diagnosed with generalized AgP with most affected upper left central incisor, with deep pockets PPD- 15 mm and tooth mobility class III, according to Miller. Deep scaling and root planing with endodontic treatment is performed. Metronidazole 3 x 400 mg, and Amoxicillin 2 x 500 mg for 8 days is prescribed. Tooth 21 was also splinted after perio therapy and before endo therapy. Results: After 2 years tooth 21 has no pockets and its mobility is class I, according to Miller. Conclusion: Correct treatment technique in shaping and filling of root canal with thorough deep scaling and root planning, supported by antibiotic therapy in this case, are the keys to successful healing.

Periimplantitis je jedan od kasnih neuspjeha implantoloske terapije. Ocituje se krvarenjem pri sondiranju, povecanom dubinom sondiranja, ponekad prisutnoscu gnoja, a u uznapredovalim slucajevima i resorpcijom okolne alveolarne kosti u obliku lijevka. Za potrebe lijecenja ovog upalnog procesa razvijen je CIST protokol (engl. cumulative interceptive supportive therapy) koji sadrži 5 mjera, od A do E. Prikazan je slucaj pacijenta nepusaca starosti 38 god. koji se 4 mjeseca nakon ugradnje implantata javio zbog krvarenja i neugodnog mirisa u podrucju oseointegriranog implantata postavljenog na mjestu zuba 36. Klinickim pregledom uvtrđeno je krvarenje gingive, dubine sondiranja 5-6 mm (ovisno o mjernom mjestu), te resorpcija alveolarne kosti 1 mm.Metode: Pod lokalnom anestezijom, bez odizanja režnja, mehanicki su uklonjene naslage s povrsine implantata aparatom KaVo Sonicflex. Džepovi su ispirani 0, 2% otopinom klorheksidina (Perio Aid, Dentaid, Spanjolska). Naposlijetku je povrsina implantata tretirana sustavom za svjetlosno aktiviranu dezinfekciju (FotoSan 630, CMS Dental A/S, Danska) koji ukljucuje toluidinsko modrilo u obliku gela i svjetlost valne duljine 630 nm ciji je izvor diodni laser.Pacijent je dodatno koristio 0, 2% klorheksidinsku otopinu za ispiranje usne supljine 2 puta dnevno tijekom 2 tjedna.Rezultati: Postoperativni tijek je bio uredan. Pet tjedana nakon provedenog lijecenja gingiva vise nije krvarila, a dubina sondiranja iznosila je na najdubljem mjestu 2 mm. Zakljucci:Unatoc trendovima koji prednost daju primarno kirurskom pristupu lijecenju periimplantitisa, apsolutno je potrebno je pridržavati se CIST protokola. U njegovom provođenju znacajnu ulogu bi mogli igrati sustavi za svjetlosno aktiviranu dezinfekciju koji vjerojatno kompenziraju nemogucnost potpunog uklanjanja biofilma s povrsine implantata.

Probiotics are live microorganisms which administered in adequate quantities have beneficial effects on the health of the host. The word probiotic means “for life”. Probiotics contribute to the microbial balance, protect the body from harmful microorganisms, enhancing the immune system, and play an important role in maintaining oral health. Bacteria are commonly used as probiotics. Dental caries and periodontal disease the most common diseases in oral cavity caused by bacterial activities. Probiotics used in the treatment of oral changes are in the form of lozenges, tablets, capsules, liquids, yogurt and cheese.

Cilj: Mnoga objavljena istraživanja dokazala su umjerenu povezanost između pretilosti i parodontitisa, no vecina ih je ukljucivala dijabeticare i

Cilj: Izmjeriti razliku elektricnog potencijala i pH u usnoj supljini pacijenata s erozivnim i neerozivnim oralnim lihen planusom (OLP) koji istovremeno u ustima imaju vise razlicitih dentalnih legura. Metode: U studiji je sudjelovalo 10 pacijenata s erozivnim OLP-om, 22 pacijenta s neerozivnim OLP-om i 29 kontrolnih ispitanika bez OLP-a. Svi ispitanici u usnoj supljini trebali su imati najmanje 2 razlicite legure – minimalno jedan amalgamski ispun i neku drugu dentalnu leguru. Razlika elektricnog potencijala mjerena je uporabom kompjutorski kontroliranog milivoltmetra, a pH sline uporabom pH indikatorskih papirica. Rezultati: Razlika elektricnog potencijala u pacijenata s erozivnim OLP-om iznosila je 120 (45 – 275) mV, u pacijenata s neerozivnim OLP- om 153 (45 – 230) mV, a u kontrolnih ispitanika 140 (45 – 265) mV. Kruskal-Wallisovim testom nije utvrđena statisticki znacajna razlika između skupina u razlici elektricnog potencijala (P = 0, 689). Između skupina nije utvrđena znacajna razlika u pH sline (P = 0, 322). Rasprava i zakljucak: Vrijednosti razlike elektricnog potencijala i pH sline u pacijenata s erozivnim i neerozivnim oblikom OLP-a ne razlikuju se od pacijenata koji ne boluju od OLP-a, sto sugerira da kod OLP-a nije potrebna zamjena amalgama.

Koronarna srcana bolest (KSB) cesto se javlja u odrasloj populaciji. Osim sto predstavlja životno ugrožavajucu bolest, ona cesto nosi i rizik od razvoja stanja kao sto su kserostomija i stomatopiroza ; kserostomija uz to predstavlja i faktor rizika za naseljavanje gljive Candida albicans. Cilj ovog istraživanja bilo je utvrditi incidenciju kserostomije, stomatopiroze i infekcije Candidom albicans u skupini oboljelih od KSB, te rezultate usporediti sa zdravim kontrolama. Istraživanje je provedeno na uzorku od ukupno 292 pacijenta, 149 kontrola i 143 ispitanika u testnoj skupini. Procjenjivala se kolicina izlucene sline (stimulirane i nestimulirane), prisutnost stomatopiroze, te stupanj infekcije Candidom albicans, a dobiveni su i podaci o uzimanju lijekova. Kserostomija i stomatopiroza znacajno su se cesce javljale u skupini oboljelih, a njihova je incidencija bila vrlo visoka ; također u istoj skupini cesce su bile i infekcije Candidom albicans, no bez statisticke znacajnosti. Infekcija Candidom albicans bila je u skupini oboljelih od KSB znacajno povezana sa kserostomijom. Uzimanje određenih lijekova može objasniti pojavu kserostomije i stomatopiroze, ali samo u određenom postotku slucajeva. U svakodnevnoj praksi neophodno je uputiti pacijente i njihove lijecnike na mogucnosti dijagnoze i lijecenja navedenih patoloskih stanja.

This chapter describes the development of voltage control system of a synchronous generator based on neural networks. Recurrent (dynamic) neural networks are used, as a type that has great capabilities in approximation of dynamic systems. Two algorithms are used for training – Dual Heuristic Programming (DHP) and Globalized Dual Heuristic Programming (GDHP). The algorithms have been developed for the optimal control of nonlinear systems using dynamic programming principles.

Cilj: Mnoga objavljena istraživanja su dokazala umjerenu povezanost između pretilosti i parodontitisa. No, vecina ih je ukljucivala dijabeticare i pusace, te nijedna nije provedena na podrucju istocne Europe. Cilj ovog istraživanja bio je procijeniti povezanost između pretilosti i parodontitisa na uzorku pacijenata bez dijabetesa te nepusaca starosti 31-75 godina. Studija je bila presjecna. Metode: Ukupno je regrutirano 320 pacijenata Klinike za dentalnu medicinu Klinickog bolnickog centra Rijeka. Potpuni parodontni status uzet je za 292 osobe ; parodontitis je kategoriziran kao pocetni, umjereni i uznapredovali. Za svakog pacijenta su zabilježeni dob i spol, visina, težina, te razina obrazovanja. Parodontitis je bio uzet kao nezavisna varijabla dok je indeks tjelesne mase (engl. bodymassindex, BMI) bio zavisna varijabla. Rezultati: Parodontitis nije znacajno korelirao s BMI. No, analizom logisticke regresije dokazano je da pretile žene nižeg stupnja obrazovanja starosti 36-55 godina imaju 5-6 puta veci rizik od razvoja teskih oblika parodontalne bolesti. Zakljucak: Pretilost i parodontitis mogu biti povezani, i to u skupini slabo obrazovanih žena od 36 do 55 godina starosti. Istraživanje je provedeno u sklopu projekta financiarnog od strane Ministarstva znanosti, obrzovanja i sporta RH „Bioloski ucinci stomatoloskih materijala” broj 062-0650444-0442.