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Yayın A new way of conducting war: Cyberwar, is that real?(Springer-Verlag Berlin Heidelberg, 2014-12-01) Mehmetçik, HakanThere are numerous discussions on both the reality and impact of cyberwar. Most of the critics are based on the Clausewitzian perspective of war in which its political nature must exist, an act of war has to be characteristically violent and has instrumental purposefulness. Therefore cyberwar is generally regarded as a conduct of action that simply doesn't match with these Clausewitzian criteria of war. However during the last two decades, with the advancement of information technology and widening connecters of the world, many incidents such as Estonian and Georgian cases of cyberattacks, Stuxnet worms, and many other politically motivated cyberattacks, show us that we need to think carefully about the terminology that being used by scholars, experts and policy makers. In this chapter, I aim to discuss about the term cyberwar within a broader theory of war in International Relations studies. In doing so, my aim is to bring together related International Relations Theories and the contemporary cyberwar discussion and discuss the issue within a theoretical perspective.Yayın 3-D Mesh geometry compression with set partitioning in the spectral domain(IEEE-INST Electrical Electronics Engineers Inc, 2010-02) Bayazıt, Uluğ; Konur, Umut; Ateş, Hasan FehmiThis paper explains the development of a highly efficient progressive 3-D mesh geometry coder based on the region adaptive transform in the spectral mesh compression method. A hierarchical set partitioning technique, originally proposed for the efficient compression of wavelet transform coefficients in high-performance wavelet-based image coding methods, is proposed for the efficient compression of the coefficients of this transform. Experiments confirm that the proposed coder employing such a region adaptive transform has a high compression performance rarely achieved by other state of the art 3-D mesh geometry compression algorithms. A new, high-performance fixed spectral basis method is also proposed for reducing the computational complexity of the transform. Many-to-one mappings are employed to relate the coded irregular mesh region to a regular mesh whose basis is used. To prevent loss of compression performance due to the low-pass nature of such mappings, transitions are made from transform-based coding to spatial coding on a per region basis at high coding rates. Experimental results show the performance advantage of the newly proposed fixed spectral basis method over the original fixed spectral basis method in the literature that employs one-to-one mappings.Yayın Enabling 5G indoor services for residential environment using VLC technology(Elsevier B.V., 2022-03-10) Miramirkhani, Farshad; Karbalayghareh, Mehdi; Zeydan, Engin; Mitra, RangeetVisible light communication (VLC) has emerged as a viable complement to traditional radio frequency (RF) based systems and as an enabler for high data rate communications for beyond-5G (B5G) indoor communication systems. In particular, the emergence of new B5G-based applications with quality of service (QoS) requirements and massive connectivity has recently led to research on the required service-levels and the development of improved physical (PHY) layer methods. As part of recent VLC standards development activities, the IEEE has formed the 802.11bb “Light Communications (LC) for Wireless Local Area Networking” standardization group. This paper investigates the network requirements of 5G indoor services such as virtual reality (VR) and high-definition (HD) video for residential environments using VLC. In this paper, we consider such typical VLC scenarios with additional impairments such as light-emitting diode (LED) nonlinearity and imperfect channel feedback, and propose hyperparameter-free mitigation techniques using Reproducing Kernel Hilbert Space (RKHS) methods. In this context, we also propose using a direct current biased optical orthogonal frequency division multiplexing (DCO-OFDM)-based adaptive VLC transmission method that uses precomputed bit error rate (BER) expressions for these RKHS-based detection methods and performs adaptive BER-based modulation-order switching. Simulations of channel impulse responses (CIRs) show that the adaptive transmission method provides significantly improved error rate performance, which makes it promising for high data rate VLC-based 5G indoor services.Yayın Transformation of space design: virtual reality(Güven Plus Grup A.Ş. Yayınları, 2022-11) Çapaner, Emine Gizem; Nas, Sezin; Özker, SerpilThe concept of space has developed and evolved depending on the change and transformation of the age for each period where there is user. The process of creating a place, which started with the concept of shelter, has survived to the present day by transforming into various spaces by forming borders such as caves, tents, shelters, and residences. In this development process of space, the design of the space has found its place in various forms and meanings over time. At the same time, the development of technology and keeping up with the times have changed the meaning of real space. In this way, the concepts of interaction and interact have become an indispensable element of Daily life. The change process in information Technologies has been integrated into all life, causing an increase in digital consumption. Today, the process of transforming from a physical space to a virtual space has become attractive for many users. Thus, the use of virtual reality applications in space design has become an important issue. Two- and three-dimensional programs, which were previously obtained by using various tools of the computers, have transformed the perception of reality and left their place to the virtual reality environment. In this context, the use of space design, virtual reality, and virtual reality applications in space design has been examined in the context of the literature. In this direction, the aim of this study is examining the effects of virtual reality, which is the output of the technology age, on the transformation of space design and its use in space design. Consequently, since the use of space design is developed with the concept of technology beyond virtual reality, and the potential of virtual reality and space design to contribute to wide and different disciplines, this study concluded that the studies on virtual reality are insufficient.Yayın Heart rate variability in athletes during a virtual reality-based working memory experience(Altınbaş University, 2024-12-31) Özgün, İrem; Işıkçı Koca, Elif; Scharfen, Hansi; Özbilgen, Eda; Yerlikaya, Deniz; Duru, Adil DenizThe study explores the link between cognitive performance and heart rate variability (HRV) using a virtual reality (VR) cognitive assessment system by Neo Auvra® Digital Health and Bionics Technologies Inc. All participants underwent varying levels of mental workload in the VR environment, with metrics like Verbal Working Memory Capacity Item Number (VeWMCIN), Visuospatial Working Memory Capacity Item Number (ViWMCIN), Working Memory Efficiency Task Switching Speed (WMETSS), and Visual Attention Accuracy (VAA). Heart Rate Variability (HRV) data was collected during VR session from two groups: athletes and sedentary individuals. Multivariate analysis of variance (MANOVA) was employed. When analyzing the results of the study, it was concluded that HRV parameters did not differ significantly (according to p-value) or significantly (according to 95% Cis and effect sizes) between different levels (cognitive load), HRV parameters showed significant (according to p-value) and significant (according to 95% Cis and effect sizes) differences between different groups, while athletes had better values in all HRV parameters except HF%, LF%, IF%.
