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This article aims to clarify the basic contents of leader Ho Chi Minh's ideology, morality and style that are valuable to the Vietnamese nation. In fact, Vietnam has been proving the miraculous vitality of Ho Chi Minh's ideology on the path and goals of national development, on the strategy of great national unity and international solidarity, innovative thinking, culture and humanities. His moral example and views on revolutionary ethical standards and ethical practice principles are the red thread throughout the progress of progressive and civilized human development. His style is extremely lively, natural, unique, attractive, magical in daily activities and behavior, which is shown as independent, self-directed and creative thinking style; scientific, democratic and mass working style; modest, polite, sincere, warm, natural and flexible behavior style; simple, clean, moderate, moderate living style. These legacies form a consistent whole in Ho Chi Minh's people, have deep scientific, theoretical and practical values ​​in terms of ethics and aesthetics, consistent with the history of the Vietnamese nation and the development trend of mankind.

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In this paper, we study and propose an efficient method to accurately estimate the position and the transmit power of a primary user for spatial resource utilization in cognitive radio networks (CRNs). Not similar to conventional methods where positions of at least four secondary users are assumed to be known and then, complex techniques such as least square and constrained optimization algorithms are used, we handle the estimation problem with only three known positions of secondary users. Moreover, we give closed forms for all estimated parameters and study the problem in practical scenarios by considering a received signal threshold at secondary users. Computer simulations show the effectiveness of the proposed method.

The present paper analyses the aspects of investigations of crime involving cryptocurrencies as a payment instrument. Ever since their emergence, cryptocurrencies have come to be actively used by criminals in all types of illegal activities, such as drug trafficking, money laundering, illegal arms trade, payments for criminal services and many other crimes. The paper aims to establish the methods of crime investigation to track data on cryptocurrency transactions and identify and show up the participants of illegal operations. The author shows that the development of computer and digital information technologies and the Internet has brought about the ever-increasing prevalence of cryptocurrencies in all social domains, including the shadow sector, i. e., the criminal world. Figures are provided illustrating the overall circulation of cryptocurrencies in the world and its illegal segment. Explaining the attractiveness of cryptocurrencies for criminal structures, the author points at its anonymity and inadequate regulation of various aspects in laws. An analysis is provided of the practice of countries where cryptocurrency circulation is not only permitted but regulated to a maximum possible extent. The impact of such regulation for the state of the shadow cryptocurrency market is shown. The research further concerns the potential for bringing international expertise to the Socialist Republic of Vietnam. Potential methods of crime investigation concerning shadow cryptocurrency transactions are outlined, helping to identify and show up the participants involved. Forecasts are provided as to the development of modern forensics and the emergence of new forensic methods helping to uncover cryptocurrency-related crime; proposals are drawn for amending criminal and criminal procedure laws to facilitate investigations in the new context.