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Application of homotopy perturbation method in solving coupled schrödinger and poisson equation in accumulation layer
Get PDFIn this manuscript, a novel approach for an approximate solving of coupled Schrodinger-Poisson (SP) equations in the accumulation layer of semiconductor is described. This approach, based on the homotopy perturbation method (HPM), gives an approximate analytic solution of SP system which at the same time has a relative simple mathematical form, as well as a high degree of accuracy. A good agreement between HPM solution and exact solution of SP system indicates on the utility and sufficiency of the HP method
Razmena toplote kroz kompozitne zidove
Get PDFWe investigated the heat conduction through different composite walls and analysed heat balance - thermal efficiency on both sides of the walls. Advantages are commented and the necessity of thermal isolation is emphasized. Examples of several combinations for two ways of passive isolation are analysed. Numerous materials for thermal isolation are presented and value of the overall coefficient of transmission is calculated for different combinations. It is concluded that for construction of walls it is better to use shallow brick rather than full and that it is more efficient to place thermal isolation on the exterior side of wall because only in that case continual isolating layer can be realized.U radu je razmatrano provođenje toplote kroz različite kompozitne zidove i toplotni bilans - termalna efikasnost sa obe strane zidova. Navedene su prednosti i neophodnost postavljanja termoizolacije i dati su i analizirani primeri više kombinacija za dva načina pasivne izolacije. Predstavljeni su brojni termoizolacioni materijali i izračunata je vrednost ukupnog koeficijenta prolaza za razne kombinacije. Konstatovano je da je kod konstrukcije zidova bolje koristiti šuplju opeku od pune i da je efikasnije postaviti termoizolaciju na spoljašnjoj strani zida, jer samo tada može ostvariti neprekinut izolacioni omotač
Opšti aspekti aplikativne it bezbednosti
Get PDFTo achieve a satisfactory level of security of an information system, different system and application methods are applied. The paper has a focus on general aspects of application IT security, thereby giving an overview of security methods applied to the web and mobile applications. In accordance with the OWASP report, out of web vulnerabilities the most common include SQL Injection and Cross-site Scripting type of attacks. The paper also emphasizes the role of code analysis tools, which contribute to the detection of vulnerabilities of analyzed application. In the context of mobile applications, Android operating system is especially featured, as one of the most commonly used. The necessary environment and tools for testing the security of Android applications are elaborate, vulnerabilities highlighted and a greater number of security recommendations are offered. In the field of application security, some of the newer solutions are shown, such as RASP approach. The paper particularly emphasizes the importance of security testing of applications, with accent on testing phase. Finally, in addition to the previously explained application of security methods, an overview of security methods of a general character is given.Za postizanje zadovoljavajućeg nivoa bezbednosti jednog informacionog sistema primenjuju se sistemske i aplikativne mere. Rad je fokusiran na opšte aspekte aplikativne IT bezbednosti, uz pregled bezbednosnih metoda primenjenih na veb i mobilne aplikacije. U skladu sa izveštajem OWASP, od veb-ranjivosti izdvojeni su, kao najčešći, napadi tipa SQL Injection i Cross-site Scripting. U radu je istaknuta i uloga alata za analizu koda, koji doprinose detekciji bezbednosnih propusta analizirane aplikacije. U kontekstu mobilnih aplikacija, posebno je izdvojen operativni sistem Android, kao jedan od najčešće korišćenih. Elaborirani su neophodni alati i okruženja za ispitivanje bezbednosti Android aplikacija, istaknute su ranjivosti i dat je veći broj bezbednosnih preporuka. U domenu aplikativne bezbednosti prikazana su i neka od novijih rešenja, kao što je pristup RASP. U radu je posebno istaknut značaj testiranja bezbednosti aplikacija, s akcentom na faze testiranja. Na kraju je, pored prethodno objašnjenih aplikativnih bezbednosnih metoda, dat i pregled metoda zaštite opšteg karaktera
Uticaj izveštaja Arčibalda Rajsa na zapadnoevropsko javno mnjenje o Srbiji tokom Prvog svetskog rata
Get PDFU uvodnom delu članka analizirana je medijska slika o Srbiji uoči Prvog svetskog rata, a zatim sledi analiza okolnosti koje su prethodile dolasku Arčibalda Rajsa u Srbiju 1914. godine. Njegovo izveštavanje o Srbiji tokom Prvog svetskog rata podeljeno je na tri perioda: prvi – 1914. godina, drugi – 1915. godina i treći – od 1916. do 1918. godine. Istraživanjem se došlo do zaključka da je Arčibald Rajs svojim izveštajima objektivno informisao zapadnoevropsku javnost o zločinima koji su počinjeni nad Srbima, uticao na poboljšanje medijske slike o Srbiji, podstakao organizovanje humanitarne pomoći srpskom narodu i doprineo objašnjavanju srpskih ratnih ciljeva, što je veoma značajno kada se ima u vidu nizak ugled Srbije i srpskog naroda u štampi i javnom mnjenju Zapadne Evrope pre njegovog dolaska u Srbiju 1914. godine
Krizne situacije - pripremljenost države, lokalne zajednice i građana
Get PDFThe paper presents the results of a quantitative survey of the perception of the readiness of state administration and local governments, households and citizens to react in crises caused by floods in the Republic of Serbia. Starting from the theory of readiness as the framework for explaining the way in which the community changes with regard to the implementation of certain preventive measures, the impact of certain demographic, socio-economic and psychological characteristics of citizens on their perception of the readiness of the mentioned subjects of the protection and rescue system is examined. The objective of quantitative research is the scientific explanation of the impact of these factors on the perception of readiness. Starting from the empirically not tested state of perception of the readiness of the protection and rescue system for reaction, this paper has the scientific and social significance. Furthermore, research results can be used to improve the readiness of such system.U radu su izneti rezultati kvantitativnog istraživanja percepcije pripremljenosti organa državne uprave i jedinica lokalne samouprave, domaćinstva i građana za reagovanje u kriznim situacijama izazvanim poplavama u Republici Srbiji. Polazeći od teorije pripremljenosti kao okvira za objašnjenje načina na koji se zajednica menja u pogledu sprovođenja određenih preventivnih mera ispituje se uticaj određenih demografskih, socio-ekonomskih i psiholoških karakteristika građana na njihovu percepciju pripremljenosti navedenih subjekata sistema zaštite i spasavanja. Cilj kvantitativnog istraživanja predstavlja naučna eksplikacija uticaja navedenih faktora na percepciju pripremljenosti. U istraživanju sprovedenom u 19 lokalnih zajednica u Srbiji primenom strategije ispitivanja u domaćinstvima, višeetapnim slučajnim uzrokovanjem anketirano je 2.500 građana u toku 2015. godine. Rezultati istraživanja ukazuju da je ocena pripremljenosti za reagovanje najviša je kod domaćinstva (M = 3,03), a najniža kod organa jedinica lokalne samouprave (M = 2,86). Utvrđena je statistički značajna povezanost pola, godina starosti, visine prihoda i prethodnog iskustva sa percepcijom pripremljenosti domaćinstva. Sa druge strane, na percepciju pripremljenosti državnih organa statistički značajno utiču godine starosti, status zaposlenosti, visina prihoda i prethodno iskustvo. Posebno je značajno spomenuti da strah ispitanika od kriznih situacija ne utiče na percepciju pripremljenosti za reagovanje. Polazeći od empirijski neispitanog stanja percepcije pripremljenosti sistema zaštite i spasavanja za reagovanje rad poseduje visoki naučni i društveni značaj. Pri tome, rezultati istraživanja mogu biti iskorišćeni za unapređenje pripremljenosti takvog sistema
Computer-based data analysis techniques: The potential application to crime investigation in cyber space
No full textCollecting the most versatile information about individuals and their storing in different databases represent the reality of the contemporary society. The growth in the quantity of information has exceeded man’s power to process and analyze them in a traditional manner, making computerized techniques and means, especially data mining techniques, a necessity for these purposes. Although widely applied in the public administration and economy domain, computerized data search and comparison so far have not reached their full potential in the area of crime investigation and forensics. Law enforcement agencies and forensic laboratories collect large quantities of various data originating not only from a person’s criminal activities, but his/her social activities as well (i.e., blogs, social media, etc.). The very success of a crime investigation depends to a large extent on the availability of relevant data (referring to persons, objects or events) and finding often hidden relationship among them. Web space, especially social media, is invaluable source of data and often the first place crime investigators refer to in order to obtain relevant information
Vreme odziva kao organizaciona performansa službe za zaštitu i spasavanje
Get PDFThe paper proceeds from the fact that the performance of individuals and organizational units (organizations) affect their efficiency. Regarding the protection and rescue units, their key organizational performance is the response time, understood as the duration of time from the moment of receiving the fire warning until the firefighting and rescue team arrives at the place of engagement. The paper analyzes the impact of the response time of the firefighting and rescue unit on the duration of firefighting. For the analysis, operational data on fires for the area of the City of Belgrade (Serbia) were used, over a 24-year period (1986-2009). Data were processed using linear regression (Pearson Correlation) and its nonparametric alternative - Spearman's rank order correlation. It is concluded that the response time of the firefighting and rescue unit to arrive to the place of fire (organizational performance) affects the duration of firefighting, so that the shorter the response time, the shorter time it takes to extinguish the fire, with less damage caused and more goods rescued (organizational efficiency), and vice versa, the longer the response time - the longer the time of firefighting, with greater damage caused and less goods rescued.Polazište ovog rada jeste činjenica da performanse pojedinaca i organizacionih jedinica (organizacija) utiču na njihov učinak. Kada je reč o subjektima zaštite i spasavanja, njihovu ključnu organizacionu performansu predstavlja vreme odziva, shvaćeno kao trajanje od trenutka dolaska informacije o požaru do trenutka stizanja vatrogasno-spasilačke ekipe na mesto angažovanja. Preciznije, u radu se analizira uticaj vremena odziva vatrogasno-spasilačke jedinice na trajanje gašenja požara. Za analizu su korišćeni operativni podaci o požarima za područje grada Beograda, u periodu od 24 godine (1986-2009). Podaci su obrađeni primenom linearne regresije (Pearson Correlation) i njenom neparametarskom alternativom - Spirmanovim testom korelacije rangova (Spearman's rank order correlation). Zaključeno je da vreme odziva vatrogasno-spasilačke jedinice na mesto požara (organizaciona performansa) utiče na trajanje njegovog gašenja, tako da, što je ono kraće - kraće je vreme gašenja požara, šteta je manja i ima više spasenih dobara (organizacioni učinak). Obrnuto, ako je vreme odziva vatrogasno-spasilačke jedinice duže - duže je i vreme gašenja požara, uz veće štete i manje spasenih dobara
Archibald Reiss Days : Thematic conference proceedings of international significance : International Scientific Conference, Belgrade, 7-9 November 2017
Get PDFIn front of you is the Thematic Collection of Papers presented at the International Scientific Conference “Archibald Reiss Days”, which was organized by the Academy of Criminalistic and Police Studies in Belgrade, in cooperation with the Ministry of Interior and the Ministry of Education, Science and Technological Development of the Republic of Serbia, School of Criminal Justice, Michigan State University in USA, School of Criminal Justice University of Laussane in Switzerland, National Police Academy in Spain, Police Academy Szczytno in Poland, National Police University of China, Lviv State University of Internal Affairs, Volgograd Academy of the Russian Internal Affairs Ministry, Faculty of Security in Skopje, Faculty of Criminal Justice and Security in Ljubljana, Police Academy “Alexandru Ioan Cuza“ in Bucharest, Academy of Police Force in Bratislava, Faculty of Security Science University of Banja Luka, Faculty for Criminal Justice, Criminology and Security Studies University of Sarajevo, Faculty of Law in Montenegro, Police Academy in Montenegro and held at the Academy of Criminalistic and Police Studies, on 7, 8 and 9 November 2017.The International Scientific Conference “Archibald Reiss Days” is organized for the seventh time in a row, in memory of the founder and director of the first modern higher police school in Serbia, Rodolphe Archibald Reiss, after whom the Conference was named. The Thematic Collection of Papers contains 131 papers written by eminent scholars in the field of law, security, criminalistics, police studies, forensics, informatics, as well as by members of national security system participating in education of the police, army and other security services from Belarus, Bosnia and Herzegovina, Bulgaria, Bangladesh, Abu Dhabi, Greece, Hungary, Macedonia, Romania, Russian Federation, Serbia, Slovakia, Slovenia, Czech Republic, Switzerland, Turkey, Ukraine, Italy, Australia and United Kingdom. Each paper has been double-blind peer reviewed by two reviewers, international experts competent for the field to which the paper is related, and the Thematic Conference Proceedings in whole has been reviewed by five competent international reviewers.The papers published in the Thematic Collection of Papers provide us with the analysis of the criminalistic and criminal justice aspects in solving and proving of criminal offences, police organization, contemporary security studies, social, economic and political flows of crime, forensic linguistics, cybercrime, and forensic engineering. The Collection of Papers represents a significant contribution to the existing fund of scientific and expert knowledge in the field of criminalistic, security, penal and legal theory and practice. Publication of this Collection contributes to improving of mutual cooperation between educational, scientific and expert institutions at national, regional and international level
The role of cyber space in transforming conflict paradigm
Get PDFThe tidal waves of the world migrant crisis are still crashing onto European
shores. Millions of people start from Asian and African continents towards the
European states that they perceive as salvation for themselves and their families. Their
movement along the pathway is to a considerable extent alleviated by new information
technologies, most of all, mobile phones. Thanks to them and especially to the users’
networking, it is possible to provide for an exceptionally fast delivery of information
about the state and the challenges awaiting these desperate people on the way ahead.
The contemporary migrant flows are constrained by the space-time dimension since
it is in this way that the process of movement is managed in a communication-skilled
way. The emphasis is on permanent communication among actors (by mobile phones
and GPS tracking), financial logistics (by foreign currency transfers through certain
banks that keep track of them during the journey) as well as support from the previous
migrants who, by pointing to weak points of the corridor that the migrants are passing
through, enable successful networks functioning.
The social networks that basically represent modified channels for distribution of
contents are at the same time means of forming and publishing information organized
through nodes and links. The danger from their abuse is quite real. In the paper the
author points to safety challenges brought about by the use of new communication
technologies as well as the need for their monitoring
