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Blockchain technology is one of the most contemporary and disruptive technologies in the world. It has gained considerable attention in numerous applications such as financial services, cybersecurity applications, Internet of Things (IoT), network data management. Now its range of applications is beyond the financial services as the healthcare industry has also adopted blockchain technology in its various subdomains such as Electronic Health Records (EHR), medical supply chain management system, genomic market, neuroscience technology, clinical research, and pharmaceutical medicine. Blockchain is considered a secure and viable solution for storing and accessing patients medical records and the patients can diagnosed and treated with safe and secure data sharing. Blockchain technology will revolutionize the healthcare systems with personalized, authentic, and secure access to the clinical data of patients and that data can be used for further health improvements and clinical researches. In this paper, we conduct a contemporary research on existing applications and developments in healthcare industry with the use of blockchain technology. We also discuss some robust applications and various existing companies that are using blockchain solutions for securing their data along with some current challenges and future perspectives., Comment: 16 Pages, 4 Figure, 1 Table, 64 References

The ascent of the Internet has caused numerous adjustments in our lives. The Internet has radically changed the manner in which we carry on with our lives, the manner in which we spend our occasions, how we speak with one another day by day, and how we buy items. The development of the Internet among users has created content on the Internet by sources, for example, web-based life, reviews site, online journals, item fan page and some more. This has a lead on to another method for arranging an occasion or searching for a reasonable hotel to remain. Thus, hotel review sites have turned into a famous stage for visitors to share their experiences, reviews, and suggestions on hotels, which they have visited. In Europe, the hotel business has been a standout amongst the most vital monetary developments of the nation. The essential objective of a hotel is to satisfy the customers, to have the capacity to give a high caliber of administration and give them a vital affair while remaining at the hotel. The motivation behind this examination is to comprehend and recognize the scope of elements, which may add as per the general inclination of customers and in addition through their reviews to decide the measures of customers' desires. Information was gathered from online review sites, for example, Booking.com. Text analytics is utilized to analyze the contents gathered., Comment: 13 pages, 13 Figures and 16 References

Smart city technology is making cities more effective which is necessary for the rapid growth in urban population. With the rapid increase in advanced metering infrastructure and other digital technologies, Smart cities have become smarter with efficient electronic devices and embedded sensors based on the Internet of Things (IoT). This paper provides a comprehensive review of the smart cities concept with its components and applications. Moreover, technologies of IoT used in smart cities infrastructure and some practically implemented smart cities in the world are mentioned as exemplary implementations. Some open issues and future directions concluded the paper., Comment: 9 Pages, 1 figure, 1 Table, 42 References

The Smart Grid (SG) concept presented an unprecedented opportunity to move the energy sector to more availability, reliability, and efficiency to improve our economic and environmental conditions. Renewable energy sources (Solar & Wind) are such technologies that are used in the smart grid to figure out the environmental and economic issues and challenges. Smart grids provide energy in different crowded sectors with the efficient and timely transmission of electricity. But the traditional power grids follow a centralized approach for energy transactions with a large number of growing connections and become more challenging to handle power disturbance in the grid. Blockchain as a decentralized and distributed technology provides promising applications in the smart grid infrastructure with its excellent and salient features. In this paper, we provide a concise review of blockchain architecture, concepts, and applications in smart grids. Different potential opportunities for blockchain technology with smart grids are also discussed. Some future directions concluded the paper., Comment: 12 pages, 4 Figures, 50 References. 1 Table