Positron emission tomography systems are best described by a linear shift-varying model. However, image reconstruction often assumes simplified shift-invariant models to the detriment of image quality and quantitative accuracy. We investigated a shift-varying model of the geometrical system response based on an analytical formulation. The model was incorporated within a list-mode, fully 3D iter...

Contact hypersensitivity (CHS) mouse model induced by 2, 4-dinitrofluorobenzene (DNFB) is thought to be a T helper 1 (Th1)-dominant response and used for investigating anti-inflammatory and immunosuppressive agents. However, it is hardly used for screening large-scale drugs because of the large number of animals and complex mechanisms involved in-vivo. In this study, we focused on whether T lym...

in today’s advanced world resulting from the improvement of technology, societies tend to encounter a large number of problems and accidents. as we know, university’s security personnel are classified as shift workers and are exposed to health disturbing factors. the aim of this study was investigation of shift work disorders among security personnel of the hospitals affiliated to shiraz univer...

Background and Objectives: Shift working has the potential to negatively influence the quality of work life among nurses. The purpose of this study was to investigate the outbreak of shift work-related disorders and the relationship between shift work and job satisfaction in nurses of Ilam University’s subsidiary hospitals, in order to identify potential strategies for decreasing risk of health...

Defining a sound shift operator for signals existing on a certain graphical structure, similar to the well-defined shift operator in classical signal processing, is a crucial problem in graph signal processing. Since almost all operations, such as filtering, transformation, prediction, etc., are directly related to the graph shift operator. We define a unique shift operator that satisfies all p...

background: health workers ability to provide high quality care can be adversely affected by many factors such as sleep deprivation associated with shift work. the aim of this study was to compare sleep disorders among shift workers and non-shift workers in kermanshah hospital (2005) methods: at first, demographic information of the participants were gathered. 653 volunteers were divided into t...

background: today, obesity is considered as a health problem that increases the risk of some diseases. therefore, identifying the effective factors on obesity is of great importance. shift work is one of the indicators for increased risk of obesity in society and also shift work may cause various health problems for workers in military organizations. the current study aimed to investigate the r...