Öngörü hatalarına dayalı tersinir görüntü damgalama yöntemlerinin karşılaştırılması

06.03.2018 tarihli ve 30352 sayılı Resmi Gazetede yayımlanan “Yükseköğretim Kanunu İle Bazı Kanun Ve Kanun Hükmünde Kararnamelerde Değişiklik Yapılması Hakkında Kanun” ile 18.06.2018 tarihli “Lisansüstü Tezlerin Elektronik Ortamda Toplanması, Düzenlenmesi ve Erişime Açılmasına İlişkin Yönerge” gereğince tam metin erişime açılmıştır.Bu tezde, sayısal bir görüntüye uygulanan farklı iki tersinir görüntü damgalama algoritması kıyaslanmıştır. İlk algoritma, öngörü hatalarının genişletilmesine dayalı uyarlanır bir yöntemdir. Bu yöntem ile mevcut tersinir görüntü damgalama yöntemlerindeki gibi görüntüdeki tüm piksellere aynı damgalama algoritması uygulamak yerine öngörü hatalarının aldığı değerlere göre pikseller farklı iki şekilde damgalanmaktadır. Bu amaçla, görüntü pikselleri düzgün ve düzgün olmayan şekilde iki bloğa ayrılmıştır. Düzgün blokların belirli piksellerine 2-bit damgalama, düzgün olmayan blokların belirli piksellerine ise 1-bit damgalama uygulanarak damgalama kapasitesi arttırılmıştır. Ayrıca, yüksek bozunuma sebep olan pikseller belirlenip bu pikseller damgalamada kullanılmayarak damgalama sonucu orijinal görüntüde oluşan bozunum azaltılmıştır. İkinci algoritma, aradeğerleme hatalarının genişletilmesine dayalıdır. Yöntemde, aradeğerleme hatasından faydalanılmaktadır. Kıyaslanan iki yöntem ve literatürdeki mevcut yöntemler bilgisayar benzetimi ile karşılaştırılıp üstün ve zayıf olduğu yönler belirlenmiştir.In this thesis, two reversible image watermarking algorithms applied to a digital image are compared. The first algorithm is an adaptive method based on the extension of prediction errors. With this method, instead of applying the same watermarking algorithm to all pixels in the image as in the current reversible image watermarking methods, the pixel is embeded in two different ways according to the values received by the prediction errors. For this purpose, the image pixels are divided into two parts, such as "flat regions" and "rough regions". Watermarking capacity is increased by applying 2-bit swatermarking to specific pixels of flat blocks and 1-bit watermarking to specific pixels of rough blocks. In addition, distorting pixels are identified and these pixels are not used in the watermarking, resulting in reduced distortion occurring in the original image resulting from the watermarking. The second algorithm is based on the expansion of interpolation errors. In the method, the amount of additional information needed to extract the watermarked value and restore the original image are very small. The two comparative methods and the existing methods in the literature are compared with computer simulations and found to be superior and weak

South Manti Timber Salvage Draft Environmental Impact Statement

The South Manti project area is located approximately 45 miles southwest of Price, Utah. The project area consists of approximately 24,597 acres of National Forest System lands within the southern portion of the Wasatch Plateau (Townships 19, 20, and 21 South; Range 4 East; SLM). This project was initiated in response to epidemic spruce beetle (Dendroctonus rufipennis) activity across the South Manti landscape. Extensive Engelmann spruce mortality has occurred as the result of epidemic spruce beetle populations. Representing over 10,000 acres, most of the spruce trees in the project area\u27s Engelmann spruce-Subalpine fir cover type are dead or dying (70% of the spruce trees greater than 5 inches in diameter are dead, 90% of the spruce trees greater than 11 inches in diameter are dead). This Draft Environmental Impact Statement summarizes the analysis that was completed on the resulting alternatives considered for timber salvage harvest and related activities such as road work, road rehabilitation, and reforestation in the project area. This Draft Environmental Impact Statement also discloses the association of each alternative to the Agency\u27s final interim rule of March 1, 1999, which temporarily suspends decisionmaking on road construction and reconstruction in many unroaded areas within the National Forest System until a revised policy is issued or 18 months from the effective rule date, whichever is sooner. The disclosure of information in the Draft Environmental Impact Statement is intended to provide a meaningful basis for public review and comment

Dynamical Systems

Complex systems are pervasive in many areas of science integrated in our daily lives. Examples include financial markets, highway transportation networks, telecommunication networks, world and country economies, social networks, immunological systems, living organisms, computational systems and electrical and mechanical structures. Complex systems are often composed of a large number of interconnected and interacting entities, exhibiting much richer global scale dynamics than the properties and behavior of individual entities. Complex systems are studied in many areas of natural sciences, social sciences, engineering and mathematical sciences. This special issue therefore intends to contribute towards the dissemination of the multifaceted concepts in accepted use by the scientific community. We hope readers enjoy this pertinent selection of papers which represents relevant examples of the state of the art in present day research. [...

Experiential Perspectives on Sound and Music for Virtual Reality Technologies

This thesis examines the intersection of sound, music, and virtuality within current and next-generation virtual reality technologies, with a specific focus on exploring the experiential perspectives of users and participants within virtual experiences. The first half of the thesis constructs a new theoretical model for examining intersections of sound and virtual experience. In Chapter 1, a new framework for virtual experience is constructed consisting of three key elements: virtual hardware (e.g., displays, speakers); virtual software (e.g., rules and systems of interaction); and virtual externalities (i.e., physical spaces used for engaging in virtual experiences). Through using and applying this new model, methodical examinations of complex virtual experiences are possible. Chapter 2 examines the second axis of the thesis through constructing an understanding of how sound is designed, implemented, and received within virtual reality. The concept of soundscapes is explored in the context of experiential perspectives, serving as a useful approach for describing received auditory phenomena. Auditory environments are proposed as a new model for exploring how auditory phenomena can be broadcast to audiences. Chapter 3 explores how inauthenticity within sound can impact users in virtual experience and uses authenticity to critically examine challenges surrounding sound in virtual reality. Constructions of authenticity in music performance are used to illustrate how authenticity is constructed within virtual experience. Chapter 4 integrates music into the understanding of auditory phenomena constructed throughout the thesis: music is rarely part of the created world in a virtual experience. Rather, it is typically something which only the audience – as external observers of the created world – can hear. Therefore, music within immersive virtual reality may be challenging as the audience is placed within the created world.The second half of this thesis uses this theoretical model to consider contemporary and future approaches to virtual experiences. Chapter 5 constructs a series of case studies to demonstrate the use of the framework as a trans-medial and intra/inter-contextual tool of analysis. Through use of the framework, varying approaches to implementation of sound and music in virtual reality technologies are considered, which reveals trans-medial commonalities of immersion and engagement with virtual experiences through sound. Chapter 6 examines near-future technologies, including brain-computer interfaces and other full-immersion technologies, to identify key issues in the design and implementation of future virtual experiences and suggest how interdisciplinary collaboration may help to develop solutions to these issues. Chapter 7 considers how the proposed model for virtuality might allow for methodical examination of similar issues within other fields, such as acoustics and architecture, and examines the ethical considerations that may become relevant as virtual technology develops within the 21st Century.This research explores and rationalises theoretical models of virtuality and sound. This permits designers and developers to improve the implementation of sound and music in virtual experiences for the purpose of improving user outcomes.<br/

NASA SBIR abstracts of 1992, phase 1 projects

The objectives of 346 projects placed under contract by the Small Business Innovation Research (SBIR) program of the National Aeronautics and Space Administration (NASA) are described. These projects were selected competitively from among proposals submitted to NASA in response to the 1992 SBIR Program Solicitation. The basic document consists of edited, non-proprietary abstracts of the winning proposals submitted by small businesses. The abstracts are presented under the 15 technical topics within which Phase 1 proposals were solicited. Each project was assigned a sequential identifying number from 001 to 346, in order of its appearance in the body of the report. Appendixes to provide additional information about the SBIR program and permit cross-reference of the 1992 Phase 1 projects by company name, location by state, principal investigator, NASA Field Center responsible for management of each project, and NASA contract number are included

Naval Research Program 2019 Annual Report

NPS NRP Annual ReportThe Naval Postgraduate School (NPS) Naval Research Program (NRP) is funded by the Chief of Naval Operations and supports research projects for the Navy and Marine Corps. The NPS NRP serves as a launch-point for new initiatives which posture naval forces to meet current and future operational warfighter challenges. NRP research projects are led by individual research teams that conduct research and through which NPS expertise is developed and maintained. The primary mechanism for obtaining NPS NRP support is through participation at NPS Naval Research Working Group (NRWG) meetings that bring together fleet topic sponsors, NPS faculty members, and students to discuss potential research topics and initiatives.Chief of Naval Operations (CNO)This research is supported by funding from the Naval Postgraduate School, Naval Research Program (PE 0605853N/2098). https://nps.edu/nrpChief of Naval Operations (CNO)Approved for public release. Distribution is unlimited.

Application of photoactivated localisation microscopy to visualising eukaryotic DNA replication processes

DNA replication is a crucial process that ensures duplication of the genome prior to cellular division. The fidelity of this process is of upmost importance for ensuring genomic stability and the integrity of subsequent generations. Obstruction of the replication machinery by DNA damage, protein barriers or other impediments can cause replication stress, a phenotype often observed in cancer cells. Studying the underlying molecular mechanisms of DNA replication and the repair processes involved during replication arrest is thus critical to ensure a complete understanding of the process and the role it plays in cancer development and progression. A key technique used to study DNA replication and repair proteins is fluorescence microscopy, which allows researchers to visualise the expression and spatial organisation of cellular components. Until recently, the information that could be extracted from fluorescence images was restricted by limited resolution, a consequence of the diffraction of light. Recent advancements in fluorescence microscopy have yielded techniques that can break this diffraction barrier and achieve nanometre scale resolution. One such technique is Photoactivated Localisation Microscopy (PALM), which relies on the detection and high precision localisation of single fluorescent molecules. The work presented in this thesis outlines the development of an adaptation to PALM that can be used to study the chromatin association of proteins inside unfixed cells. This technique was subsequently used to study the role of ubiquitination of the replication-sliding clamp during unperturbed DNA synthesis and characterise the global DNA binding of the Smc5/6 complex during replication stress

MS FT-2-2 7 Orthogonal polynomials and quadrature: Theory, computation, and applications

Quadrature rules find many applications in science and engineering. Their analysis is a classical area of applied mathematics and continues to attract considerable attention. This seminar brings together speakers with expertise in a large variety of quadrature rules. It is the aim of the seminar to provide an overview of recent developments in the analysis of quadrature rules. The computation of error estimates and novel applications also are described