In the response phase the most important step is to assess disaster after occurrence. By disaster assessment, we can obtain all the needed information for controlling, decision-making and also disaster planning. Lack of disaster assessment causes you to make unsuitable decisions based on limited or inadequate data which leads to imperfect disaster response. According to IFRC, disaster response operation will have an unsuitable function without disaster assessment. This paper presents the principles and concepts of disaster assessment.

Purpose: Managers are one of the important elements of an organization, for this reason, in order to draw the future of the organization, it is necessary for the planners to specify the conditions of their selection and appointment. Therefore, the current research has been done with the aim of identifying and analyzing the components of selecting future principals.Method: In this research, comparative and benchmarking method is used as a prospective approach. This approach is based on the belief that today's advanced organizations/countries can be considered as a model for the future of another organization/countries in their respective subjects. For this, first, the fields of comparison and benchmarking were determined using Brody's four-step comparison method; then the countries of Canada, Finland, Australia, South Africa, and Japan were selected according to the qualitative balance value in the international advanced TEAMS test, human development index, life quality index(health, instruction, and welfare), education quality index, and other scientific-scholarly indexes; finally, by extracting the criteria for the selection and appointment of principals through content analysis and comparison with Iran, the proposed framework for Iran has been presented.Findings: A total of 61 components for the selection of secondary school principals were identified from among the studies conducted in the selected countries in this article. By extracting the commonalities and differences of each of the components among the countries, it was found that the highest index of manager selection and appointment belongs to Japan and the lowest one is related to Finland.Conclusion: There are similarities between the components of selection of principals of secondary schools in Iran and selected countries. In Iran, special attention should be paid to important components such as adherence to religious principles, appropriate personality traits, creativity and innovation, motivation to develop capabilities, professional growth, power of supervision and accountability, social image, leader skills, and purposefulness and foresight.

Automatic topic detection seems unavoidable in social media analysis due to big text data which their users generate. Clustering-based methods are one of the most important and up-to-date categories in topic detection. The goal of this research is to have a wide study on this category. Therefore, this paper aims to study the main components of clustering-based-topic-detection, which are embedding methods, distance metrics, and clustering algorithms. Transfer learning and consequently pretrained language models and word embeddings have been considered in recent years. Regarding the importance of embedding methods, the efficiency of five new embedding methods, from earlier to recent ones, are compared in this paper. To conduct our study, two commonly used distance metrics, in addition to five important clustering algorithms in the field of topic detection, are implemented by the authors. As COVID-19 has turned into a hot trending topic on social networks in recent years, a dataset including one-month tweets collected with COVID-19-related hashtags is used for this study. More than 7500 experiments are performed to determine tunable parameters. Then all combinations of embedding methods, distance metrics and clustering algorithms (50 combinations) are evaluated using Silhouette metric. Results show that T5 strongly outperforms other embedding methods, cosine distance is weakly better than other distance metrics, and DBSCAN is superior to other clustering algorithms.

Competition law is a newcomer to the legal system recently. A sound understanding of competition policy can provide us with sufficient bases to apply a fundamental and normative view of the issues of competition law. The difference in supervision and regulation determines how the market functions and in order to understand this difference one must understand competition policy. Competition policy may be based on governmental support for national production and industry or on a non-interventional and regulatory posture. Moreover, supervision, based on the principle of non-intervention in the market mechanism, is rooted in liberal ideas; however, regulation, whether as a rule or an exception, is based on the assertion that the market has been ineffective in attaining its goals. Therefore, the government will resort to interventions to regulate inefficiencies.  This paper aims to analyze Supervisory Authority in Implementing Competitive Policy by employing the description method. In this article the author tries to first delineate competition policy, its related requirements and imposed deviations to the market. Then, by defining the supervisory entity and clarifying its distinction from the regulatory institutions, the author considers the characteristics of an appropriate supervisory entity conducting a comparative study of this issue in Iran and the U.S.A. This form of Competition policy because of its applicable experiences which have been well described by recent scholarship is considered suitable for the native system.

In the past two decades caries risk prediction has been and important subject for investigators. Caries risk assessment is an effective method for the prediction of future caries. By CRA the high-risk groups are determined. Then the prevention programs in relation to high-risk groups, be perform. This article is the results of a research project which has been performed by the author in Tehran. 218 primary school children (7 years old) have participated in this study. They have been examined for caries risk factors in three stages: 1- By a questionnaire for personal and socio demographic information. 2- Bite wing radiography to diagnosis the incipient proximal caries. 3- Dental examination of the student. Results of the research showed 34 person (15.6%) were high-risk, 63 person were low-risk and 121 person (55.5%) were moderate risk. Some of the caries risk factor have been also evaluated.

As a part of the human society, children have formed the future generation of every country, and the child's interaction with the surrounding environment requires his physical and mental development. Therefore, it is important to pay attention to the environment that promotes mental and physical development of the child. In order to check the suitable environment for children, the initiative of the child-friendly city has been taken into consideration. The general purpose of this research is to improve the status of two cities from the perspective of a child-friendly city and to identify the appropriate indicators of a child-friendly city and to make a comparative comparison in the two metropolises of Tehran and Isfahan. The current research is developmental in terms of the combined method and in terms of the goal, and it is based on library and documentary studies, field surveys and interviews. Yeoman-Whitney test was used to analyze the indicators. The results of the evaluation show that in the comparison of the two cities of Tehran and Isfahan in terms of the examined indicators (social and physical, economic, environmental, urban management and leisure), Tehran city in the variable of safety and protection with an average of 3.09 and Isfahan city in Participation and citizenship variables with an average of 3.22 have a favorable level. Although Tehran is in a better condition compared to Isfahan in other indicators, in general, both cities are far apart in terms of standard indicators, and suggestions have been made in this regard.