فهرست مطالب رضا خسروی

University libraries, being at the center of global scientific and research activities, are considered as one of the most dynamic types of libraries. They continuously utilize various technologies and strive to enhance the quality of their services. Therefore, these libraries must seek ways to improve the qualitative level of user interaction with the various operational systems within the libraries. To enhance the quality of user interaction with library systems, it is essential to establish a sense of belonging among visitors. Libraries should strive to have a better understanding of their users' experiences, particularly in areas related to information technology and online catalogs. This improvement aims to enhance the development of technology interaction, provide electronic loyalty, and foster a sense of belonging among users. The main goal of this research is to investigate the role of interactive and individual components such as cognitive absorption and computer self-efficacy in determining the level of user belongingness to the online catalog system of Ferdowsi University of Mashhad Central Library. Research Objectives are:a) To determine the level of user belongingness to the online catalog system of Ferdowsi University of Mashhad Central Library.b) To determine the role of cognitive absorption in the level of user belongingness to the online catalog system.c) To determine the role of computer self-efficacy in the level of user belongingness to the online catalog system.

This research falls into the category of applied research in terms of objectives and utilizes survey and quantitative methods. The study specifically employs a self-report approach using standardized questionnaires to assess components such as user belongingness, cognitive absorption and computer self-efficacy. The statistical population includes all postgraduate students at Ferdowsi University of Mashhad, and the sample size is determined to be 367 individuals. Data collection is carried out through three evaluation questionnaires. To evaluate user belongingness, the UES questionnaire is used, while cognitive absorption and computer self-efficacy are assessed using the Agarwal and Karahanna questionnaire and a standard questionnaire, respectively. The research employs both convergent and discriminant validity for measurement models and Cronbach's alpha for reliability.

Initial examination analysis of the collected data revealed that 54.38% of respondents were female. Regarding age groups, 59.83% were in the 21-25 age group. In terms of educational level, 6.58% were pursuing postgraduate studies. Subsequently, factor analysis was employed to respond to research questions and analysis of the data. Since this research aimed to explore the fundamental variables of a phenomenon (user engagement) by summarizing a set of data to elucidate internal relationships, confirmatory factor analysis was deemed the most appropriate method for data analysis, especially to address the main research questions. Statistical analyses indicated that the level of user engagement with the OPAC (Online Public Access Catalog) of Ferdowsi University's central library was relatively low. Among various components, perceived usability was only at a moderate level, with other components falling below the average. Other findings suggested that cognitive absorption and computer self-efficacy significantly influenced the level of user engagement. Higher levels of these two components were associated with increased user engagement with the central library's OPAC. Upon closer examination of specific components, it was revealed that temporal self-disposition, control, curiosity about cognitive absorption, and basic computer skills had the most significant impact, while other components had less significant effects.

The findings indicated that the level of user engagement with the Online Public Access Catalog (OPAC) was low. This could be attributed to the uniformity of library catalog environments, where interactions with other users (suggestions, feedback, etc.) were not emphasized. Activities such as reviewing photos, updating profiles, etc., had a considerably lesser effect on user engagement. Another reason for users' limited engagement with the library catalog could be the lack of interest and enthusiasm for library topics and content. The findings related to the first part of the research hypothesis demonstrated that each of the cognitive absorption components played a significant role in user engagement. Sub-components such as users' perception of the practicality and ease of use of the library catalog were crucial. It was inferred that if users perceive the utility and ease of use of the library catalog, their engagement with it would increase. Factors affecting practicality include compliance with user needs and ease of use of computerized lists. The findings related to the second part of the research hypothesis also showed that each of the computer self-efficacy components had a significant impact on user engagement. It can be concluded that computer self-efficacy is a crucial factor in user interaction with computer systems, encompassing beliefs and individuals' ability to use computers to solve problems and achieve goals. Higher computer self-efficacy leads to the increased familiarity with new software and tools, resulting in overall better computer performance. It can be inferred that experience in any field can serve as a foundation for subsequent experiences.

In this paper a new topology of pulsed-power converter to generate high-voltage pulses by low-input source is proposed. The proposed high step-up converter can generate high output voltage with few number of elements and stages. This converter which is based on switch-capacitor structure is self-balanced and can be used in portable pulsed power supply. To show the validity of the proposed converter operation, a prototype of the proposed topology in the laboratory was constructed. The results show proper operation of the converter.

The present paper seeks to identify the obstacles and problems, in Creating an appropriate environment for the villagers of the border and deprived Marivan and Sarvabad County to entrepreneurial micro businesses. Data gathering in the theoretical part was done by using documentary resources and in the practical section with survey method and based on distribution of questionnaire among 78 employed rural in the micro businesses and 25 knowledgeable and specialized developers in rural issues who were chosen by using Purposeful sampling method. Data analysis was performed by inferential statistics (factor analysis and Pearson correlation and partial correlation) and indicates that in total, there are four factors including; weakness in planning, executive performance of public institutions and Failure to supply infrastructure and services and facilities, weaknesses in marketing, sales and technical and practical barriers, Social and cultural barriers and constraints training and financial resources constraints, are most important obstacles facing tendency of villagers to operate in entrepreneurial micro businesses in the villages of the region. Among them, weakness in planning, executive performance of public institutions and Failure to supply infrastructure and services and facilities have the greatest impact on the tendency of villagers to entrepreneurial micro businesses. Also, the results showed According to the severity of the impact of these environmental barriers in the region, Personal variables can not reduce effectiveness them In the villagers' desireto micro-entrepreneurial businesses

Wetlands are the most important natural ecosystems on the earth, and assessing changes in them is one of essential nessesties in natural resource management of this valuable natural ecosystem. The aim of this study is to investigate water body changes using remote sensing water indices and Google Earth Engine (GEE) in study area of Poldokhtar wetlands, Lorestan province. Remote sensing water indices includes AWEInsh ،AWEIsh، NDWI، mNDWI، NDWI plus VI، mNDWI plus VI and LSWI plus VI that were used TM, ETM+ and OLI Landsat satellite images, and Google Earth Engine were applied Landsat Water Product data. The results demonstrated temporo-spatial distribution of water body changes in the study area and they were compared to real data indicating AWEIsh and AWEInsh with overall accuracy of 99.39 and 99.19 and Kappa coefficient of 0.94 and 0.91 were the best water indices among all in enhancing water bodies, furthermore, GEE results showed overall accuracy of 87 and kappa Coefficient of 0.86. These results indicate that water indices and GEE are useful tools in detection of increasing and decreasing trends in water bodies that can assist planner and policy makers in protecting and managing natural resources in the study area.

In the current era, the study of the relationship between different markets and their impact on each other has become a necessity micro and macro investors. By investigating the relationship between markets, in addition to being able to obtain the required information about the impact of the markets, it can also help him in identifying various risks. According to the importance of the subject, in this paper, we have tried to investigate the relationship between the oil market and the gold, dollar markets, companies and energy funds in the field of energy, using the new associative rules approach and the Apriori algorithm. The use of associative rules explicitly explains the relationships between database fields and the relationships and interrelationships between a large set of data items. The results of this study indicate a direct relationship between the oil market and companies active in the energy sector, and the reverse relationship with the dollar index. There was also no significant relationship between the oil and gold market.

The core needle biopsy (CNB) is a commonly used method and a gold standard for the diagnosis of breast lesions. The purpose of this study was to compare the results of visual inspection of ultrasound-guided core needle biopsy specimens with pathology outcomes in patients with breast tumors.
In this cross-sectional descriptive study, 600 patients with breast tumors who were candidates for core needle biopsy with ultrasonography were entered into the study according to inclusion and exclusion criteria. Then, samples were taken by a radiologist who categorized the breast mass to malignant or benign according to its consistency and shape, based on observation, as well as the Breast Imaging Reporting and Data System (BIRADS). The results of the core specimen categorization were compared with the pathology outcomes.
Findings: The sensitivity and specificity of the core specimen categorization were 97.48% and 94.10%, respectively. The positive and negative predictive values of this test were 85.64% and 99.05%, respectively.
The sensitivity and specificity of the visual inspection of core specimen was high for detecting the type of mass. So, it can increase the accuracy of the biopsy of the breast lesions, especially in sizes less than 10 mm, reduce the number of cores taken from the lesion, and give the patient a relative assurance of benign lesion at the same time as performing a biopsy to remove his/her anxiety earlier.

Since 25 years ago, when Giddens Structural Theory (ST) was introduced in accounting papers, It has strengthened its position as one of the most important schools of thought for accounting discovery as an organizational, social and political phenomenon in organizations and accepted by most accounting researchers as a theory. This theory is not only useful in challenging the assumptions of the intrinsic and functional characteristics of accounting and management accounting information systems; it also expands the sources of alternative theories. Giddens has proved his structural theory to directors and accounting researchers in useful areas and has used the theory of founding sociologists such as Marx, Weber, and Durkheim in his various studies in the interpretive and applied processes of structural theory. Structural theory plays a fundamental role in the role of accounting in the structure of both the individual and departmental relationships of the organization. The focus of the Giddens theory is of an organizational and "strategic" type, so that it transfers the central role that accounting appears to be in building and rebuilding organizations. The structural theory of accounting, from the magnitude of the magnitude, can be seen as an important "ready-made" structure to serve the organization, as well as a very specific set of meanings through which a better understanding of an organizational event can be achieved. The introduction of the Giddens Structural Theory (ST) is a significant contribution to challenging the functionalism assumptions that underlie the dominant thinking research.
In the present article, for the first time in the country, the introduction and explanation of Giddens structural theory, the evolution of accounting research related to this theory and the manner of interaction and the relationship between this theory and its components in the accounting system from the perspective of knowledge are discussed.

In this paper, the problem of joint optimization of transmit–and-receive Beamforming vectors in array radar is considered. Here, our goal is to maximize the signal-to-interference-plus-noise ratio (SINR) for a point like target in the presence of multiple signal dependent interferences. Therefore, we propose an iterative algorithm, which is based on the convex optimization solution and in each iteration of it, the constrained transmit beamformer is designed by a relaxation and randomization technique. In addition to power constraint, the constant envelop constraint on the transmit beamformer is considered which is important in practice. Simulation results show that the proposed method is able to achieve a higher SINR in comparison with the conventional phased array radar. it is also possible to get close to the performance of non-constrained method by considering the constant envelop constraint.

Security¡ with all its aspects¡ has been known as one of most fundamental and essential human needs in Islam. One aspect of security is economic security. Economic development and land reclamation need to prepare and upgrade economic security. Economic security is produced by knowing agents and obstacles¡ threats¡ manner of establishment and working procedures and its effects. Imam Ali`s short government and his emphasis on sane economic space¡ that is¡ economic security¡ may give a full and good model for establishing and upgrading economic security. The paper has studied importance of economic security¡ agents for and against it and Imam`s manners in the field.

The purpose of this study is to increase the tendency of the faculty members to use the guidelines on the worksheet of scientific informational system of the university.
This is an applied research which uses survey as an objective method and “Comparing Prototype Alternatives” method to examine the rate of usability. The research population is the faculty members of Ferdowsi University of Mashhad. To collect the data, interviews were conducted with 10 members.
Findings: The results showed that the acceptability of the online help and the instructional films can increase the tendency of the faculty members to use the scientific informational system of the university. Instructional films with the average of 3.85 have higher effect on increasing their tendency than the online help with the average of 3.64. Results showed that, factors such as the background color, content of guidelines (words, sentence length, the spring time of guidelines, and the place of guidelines) and preparation assistance at the frame of didactic films have the most important effect on this issue. The results also showed that, by designing guidelines according to basic and scientific principles and emphasizing on the learning methods of users, the tendency of the faculty members to use the informational system can increase.

The purpose of this research was to examine the satisfaction rate of academic staff in using guidelines and an instructional film when storing their research outputs in the organizational repository SISU. Academic staff would have little problems if the system become useable and this issue can be effective in decreasing errors at the moment of storing.

This research was an applied evaluative approach “Comparing Prototype Alternatives” method was used in this research. The research population was the academic staff of Ferdowsi University of Mashhad among whom 10 members were are selected as sample for this research.

The satisfaction of academic staff was examined with benefit and efficiency concepts. The result of absolute T statistical test showed that guidelines and the instructional films gained the satisfaction of the academic staff about the benefits and efficiency of these guidelines. Results also showed that criteria such as accessibility of guidelines, clarity and comprehensibility of them, necessary instructions at different point of worksheets about guidelines; and criteria such as high clarity of voice, adding texts to films, and the movement of cursor at important points for instructions film can provide more satisfaction among users in using the system.