Editorial & Advisory Board - Acta Technica Corviniensis

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Figure 4: An example of cutting forces waveform elements, with the cutting conditions: a p = 0,2 mm, f = 0,035 mm, the material TiGr4 and also their dynamic elements. Figure 5: An example of cutting forces waveform elements, with the cutting conditions: a p = 0,6 mm, f = 0,035 mm, the material TiGr2 and also their dynamic elements. Figure 6: Graphical representation of the dynamic machinability of compared materials. In point of view of cutting material was designated as suitable cutting plate DCGT 070204 ER‐SI (polished), which is much more resistant to thermal shock in the cutting zone and has a greater wear resistance of 70‐ 80% as a cutting plate DCGT 070204 REX (coated). The cutting edge DCGT 070204 ER‐SI, as regards the shape of chip, in all experiments was appropriate than plate DCGT 070204 REX. This is thanks to the polished ACTA TECHNICA CORVINIENSIS – Bulletin of Engineering surface, which causes more resistance material, and the better chip removal. CONCLUSIONS Commercially pure titanium is a hardmachining material and need to be searching long time to get satisfactory results. Our research is at beginning, but from the present results indicate that the most appropriate cutting conditions for turning titanium samples at a constant speed n = 2200 m.min ‐1 , are a p = 0,2 mm (depth of cut) f = 0,035 mm (feed). The cpTi grade4 have the best machinability from the searching grades and cutting edge DCGT 070204 ER‐SI is more suitable for machining these materials. On the basis of a grant from the Grant Agency VEGA Department of machining and manufacturing technology attempt to identify the cutting parameters in nanostructured titanium as well as in commercial pure titanium and compare them with each other, and thus continue to research materials for dental implants. REFERENCES [1] D.M. Brunette, P. Tengvall, M. Textor, P. Thomsen: Titanium in Medicine (Springer‐Verlag Berlin Heidelberg, Germany, 2001). [2] Petruželka,J. ‐ Dluhoš,L. ‐ Hrušák,D. ‐ Sochová,J.: Nanostructured titanium ‐ application in dental implants. Sborník vědeckých prací Vysoké školy báňské‐ Technické univerzity Ostrava, ISBN 80‐248‐1142‐1, 1/2006, roč. 52, s. 177‐186. [3] NIINOMI, M. Recent metallic materials for Biomedical Applications. Metallurgical and materials Transactions A. march 2002. vol 33 A. s. 477‐486. [4] Valiev R.Z., Semenova I.P., Dluhoš L., a kol.: Nanostructured Titanium for Biomedical Application. Advanced Engineering Materials 2008,10, No. 8, Weinheim, IF 1,463. [5] Hrušák, D. ‐ Dluhoš,L. ‐ Petruželka, J.: Nanoimplantát ‐ implantát 3. tisíciletí. StomaTeam CZ, 2006,2, ISSN 1214‐ 147X, s. 2‐3. [6] Rack, Henry J.(2008). Recent Advances in Titanium Alloys for Biomedical Device Application, Professor at Clemson University, School of Materials Science and Engineering. (www.timplant.cz) [7] Czán, A. ‐ Neslušan, M. (2005): Trieskové obrábanie ťažkoobrábateľných materiálov. Žilina: EDIS, 174 s. ISBN 80‐969395‐2‐1. [8] Benes, J: Machining titanium implants, American Machinist, 17.8.2006 [9] www.martikan.eu [10] www.timplant.cz ACTA TECHNICA CORVINIENSIS – BULLETIN of ENGINEERING ISSN: 2067‐3809 [CD‐Rom, online] copyright © UNIVERSITY POLITEHNICA TIMISOARA, FACULTY OF ENGINEERING HUNEDOARA, 5, REVOLUTIEI, 331128, HUNEDOARA, ROMANIA http://acta.fih.upt.ro 86 2012. Fascicule 2 [April–June]
1. Petar ČISAR, 2. Sanja Maravić ČISAR GENERAL DIRECTIONS OF DEVELOPMENT IN DIGITAL FORENSICS 1. TELEKOM SRBIJA, SUBOTICA, SERBIA 2. SUBOTICA TECH‐COLLEGE OF APPLIED SCIENCES, DEPARTMENT OF INFORMATICS, SUBOTICA, SERBIA ABSTRACT: Digital forensics is essential for the successful opposition of computer crime. It is associated with many challenges, including rapid changes in computer and digital devices, and more sophisticated attacks on computer systems and networks and the rapid increase in abuse of ICT systems. For a forensic investigation to be performed successfully there are a number of important steps that have to be considered and taken. Since digital forensics is a relatively new field compared to other forensic disciplines, there are ongoing efforts to develop examination standards and to provide structure to digital forensic examinations. This paper provides an overview of the expected global directions of development in digital forensic investigations, as well as the actual trends in this area. KEYWORDS: digital forensics, forensic process, development, solutions INTRODUCTION The digital age is characterized as the wide‐ranging application of computer technology as a way that enhances former possibilities. The usage of computer systems as a tool in private, commercial, educational, governmental, and other facets of modern life has improved the productivity and efficiency of these entities. At the same time, the introduction of computers as a criminal tool has enhanced the criminals’ ability to perform, hide, or otherwise aid unlawful or unethical activity. In particular, the mass use by the general population, coupled with apparent anonymity, seems to encourage computer crimes. These “cyber‐crimes” are not necessarily new form of crimes, but rather classic crimes exploiting computer power and accessibility to information. They are a consequence of excessive availability and user proficiency of computer systems in malicious hands. In order to locate, catch and prosecute criminals involved in digital crime, investigators must implement consistent and precisely defined forensic procedures. Over the past years, computer forensics has come to the foreground as an increasingly important method of identifying and prosecuting computer criminals. Prior to the development of sound computer forensics procedures and techniques, many cases of computer crime were left unsolved. There are many reasons why an investigation might not lead to a successful prosecution, but the predominant issue is one a lack of preparation: tools and skills required to successfully gather digital evidence. Digital evidence or electronic evidence is any probative information stored or transmitted digitally and a party to a judicial dispute in court can use the same during the trial [3]. Digital evidence includes computer evidence, digital audio, digital video, cell phones, digital fax machines etc. Individuals attempting to investigate suspicious activity may also lack the financial resources or tools to conduct such an investigation adequately and ensure that the evidence is indisputable in all circumstances. Moreover, there are instances when all of the above have been adequately put in place, but, due to a lack of training and correct procedure, the evidence collected can be disputed. As a result, computer forensics seeks to introduce cohesion and consistency to the wide field of extracting and examining evidence obtained from a computer at a crime scene. It is particularly important that the extraction of evidence from a computer is performed in such a way that the original incriminating evidence is not compromised. DIGITAL FORENSICS Digital forensics is a relatively new science. Derived as a synonym for computer forensics, its definition has expanded to include the forensics of all digital technology. While computer forensics is defined as “the collection of techniques and tools used to find evidence in a computer” [1], digital forensics has been defined as “the use of scientifically derived and proven methods toward the preservation, collection, validation, identification, analysis, interpretation, documentation, and presentation of digital evidence derived from digital sources for the purpose of facilitation or furthering the reconstruction of events found to be criminal, or helping to anticipate unauthorized actions shown to be disruptive to planned operations” [2]. Some authors make a clear distinction between computer and digital forensics. Yet, for the purposes of this paper, no real distinction is made. Digital forensics can be defined in other, more general ways. For instance: digital forensics is the application of computer investigation and analysis techniques in the interests of determining potential legal evidence © copyright FACULTY of ENGINEERING ‐ HUNEDOARA, ROMANIA 87
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Imre TIMÁR University of Pannonia,
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Ioan MILOŞAN Transilvania Universi
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