H. Güçlü Yavuzcan

Asymmetric condition computed from the four tone input GaN HEMT

Asymmetric condition among the IMD components with respect to gate to source voltage (Vgs) of four tone input GaN HEMT is determined which is based on the carrier frequency (¿0). In addition to that, the critical operating frequency interval is established.

An analytical analysis of Turkish digital forensics

Abstract The first glimpses of digital forensics (DF) starts back in 1970s, mainly financial frauds, with the widespread use of computers. The evolution of information technologies and their wider use made the digital forensics evolve and flourish. Digital forensics passed a short but complex way of “Ad-Hoc”, “Structured” and “Enterprise” phases nearly in four decades. The national readiness of countries might vary for those phases depending on the economy, legislation, adoption level, expertise and other factors. Today digital forensics discipline is one of the major issues of law enforcement (LE), government, defense, industry, academics, justice and other non-governmental organizations as stakeholders have to deal with. We wanted to assess the maturity level of “Turkish Digital Forensics” in view of the digital forensics historical phases, along with some specific institutional & organizational digital forensics issues. The current digital forensic capacity and ability, understanding and adoption level of the discipline, education and training forecasts, current organizational digital forensics framework and infrastructure, expertise, certification and knowledge gained/needed by digital forensics community, tools and SW-HW used in digital forensics, national legislation, policy making and standardization issues along with the anticipated requirements for near future are aimed to address by an online survey. This paper discusses the aforementioned national issues with respect to the digital forensics discipline. It does not examine all aspects of digital forensics. The general assessment we had reached for the maturity level of “National DF” is in between the structured and enterprise phases, with a long way to go but with promising developments.

Seeded region growing based detection of cells in fish blood stained with Natt-Herrick

To specify haematological parameters is a routine procedure so that state of fish health while aqua culturing could be determined. So, important information related to diagnosis and treatment can be obtained by determining them. Natt & Herricks stain solution is the most commonly method for determining haematological parameters. It is quite difficult and time-consuming to specify count of cells and to asses blood samples taken by the solution at microscope environment as a visually judgment. In this study, an automated method independent of user intervention based on seeded region growing for specifying cell related to fish blood with Natt & Herricks stain solution is developed. To evaluate of performance of proposed method, 90 images of different species of fish (rainbow trout, sea bream) prepared with Natt & Herricks stain solution by 100× zoom ratio are used. Results obtained proposed method determines cells with 97% accuracy.