Modelo de livro para a série Ensino de Graduação da Editora UnB (Universidade de Brasília).
Template for book of the category "Ensino de Graduação" (Undergraduate Teaching) of "Editora UnB" (Brasilia University Publisher).
On the basis of the conclusions selectively gleaned from the history of ontological thought, it was assumed that the real geometry of the space of the Universe is the geometry of topologically fixed 3-dimensional hyper sphere. It claims that the understanding of metaphysical principles of space formation is important, resulting in the simplest mathematical approach to the calculation of actual astronomical distances. The comparisons of calculated lengths of trajectories of photons with the actual intergalactic distances reported by observers for different \(z\)-values are carried out using the selected assumptions. Photon mileage \(L_f = f (L_z, R_D)\) don't equal to the astronomical distance \(L_z\) detected by \(z\) value if \(R_D\) is the discrete quantum length of one of 4 space dimensions, associated with the curvature of space as a whole. The research concludes there is a good agreement between data obtained this way for star brightness with experimental data, when we speak about the hypothesis presupposing an accelerating growth of the Universe and abnormal brightness of supernovae; besides conclusions imply that adjustments to this hypothesis forward in the search of the values of brightness attenuation undetectable by today's tools are needed, otherwise, it could be talk about a possible expansion of our Universe in our era without accelerating.
Now a day every information is stored and shared on the cloud. And so the medical record especially
Personal Health Record (PHR) is an important part of health information exchange, that is need to be
stored at cloud servers. But there are various privacy problems as personal health information could be
discovered to unauthorized people. That need guarantee of the patient control over to their own PHRs,
in this method encryption of the PHRs is done before the storage on cloud. But still issues like risks
of privacy, efficiency in key administration, flexible access and efficient user administration, have still
remained the important challenge toward achieving better, cryptography imposed data access control.
In this research development, we develop a mechanism for control of data access to PHRs stored in
cloud servers. To achieve this efficient and modular data access control for PHRs, we provide encryption
approach for the encryption to each PHR file. For this system method already tried to focus on the
multiple data ownership scheme also dividing the users into security domains that highly reduce the
key management complication for owners and users. Here the system takes patient privacy as serious
issue and guaranteed it by exploiting multi-authority Encryption. Our main aim is not only privacy
but also systems scheme try to enable modification of access policies or file attributes, and break-glass
access under emergency situations. Our proposed scheme shows Extensive analysis and experimental
results are presented for security and efficiency of PHR.