M1. L2. Ubiquitous Computing: Mobile and Web Development

Summary

This lesson delves into ubiquitous computing, focusing on mobile and web development. It explores the history of mobile technology, from the DynaTAC 8000X to 5G networks, and discusses smartphone operating systems, Android and iOS. The course covers programming languages and tools for app development, including native and cross-platform options. It also introduces web technologies, the internet's origins, client-server architecture, and web development programming stacks. Networking concepts, including LAN, PAN, WAN, and network processing alternatives, are explained, along with the differences between intranets and extranets.

Takeaways

• 📱 The average person spends about three hours a day on mobile devices, with social media platforms like Facebook, Instagram, Twitter, and WhatsApp accounting for a significant portion of that time.
• 📱 Mobile technology has evolved significantly since the release of the first commercial mobile phone by Motorola in 1983, with advancements in technology like the implementation of 5G networks promising superior data speeds and reliability.
• 📈 The smartphone industry became highly competitive in the 21st century, with companies like Apple and Samsung taking the lead, and Android and iOS dominating the market with over 90% of the mobile operating system market share.
• 🛠️ Smartphone operating systems (OS) are crucial for managing both software and hardware to create a seamless user experience, with Android being open-source and iOS being exclusive to Apple devices.
• 💻 There are various programming languages and tools for developing software for mobile OS, including Java and Kotlin for Android, and Swift for iOS, with frameworks like Android Studio and cross-platform tools like Flutter and React Native.
• 🌐 The internet originated as a network used by the US defense department and has evolved to enable various activities, including e-commerce and information exchange.
• 🌐 The internet operates on the client-server architecture, where clients request services or information from servers, using IP addresses for communication.
• 🌐 Web development requires different programming stacks for client-side and server-side scripting, with languages like JavaScript, HTML, CSS for client-side, and PHP, Python, Node.js for server-side.
• 🔌 Networks are defined as a set of communication media, devices, and software needed to connect multiple devices and can range from local area networks (LANs) to wide area networks (WANs) like the internet.
• 🔄 There are three basic processing alternatives for networks: centralized, decentralized, and distributed, each with its advantages and use cases depending on organizational goals and strategies.
• 🏢 The concepts of intranets and extranets have emerged with the growth of interconnected networks, with intranets being internal to an organization and extranets allowing limited access to external parties.

Q & A

What is the focus of the lesson on ubiquitous computing?

The lesson focuses on mobile and web development within the context of ubiquitous computing.

How much time does the average person spend on their mobile devices daily according to the transcript?

The average person spends approximately three hours per day on their mobile devices.

What was the first commercial mobile phone released by Motorola in 1983 known as?

The first commercial mobile phone released by Motorola in 1983 was known as the Motorola DynaTAC 8000X.

What was the significance of the Nokia 7110 in mobile technology history?

The Nokia 7110, unveiled in 1999, was the first mobile device to take advantage of WAP, allowing access to information over a mobile wireless network.

What is the main difference between Android OS and iOS in terms of accessibility and compatibility?

Android OS is open-source and can be used on a variety of devices, while iOS is exclusive to Apple devices and follows a closed ecosystem.

What does the acronym 'WAP' stand for and what was its role before GPS?

WAP stands for Wireless Application Protocol and it was a means of accessing information over a mobile wireless network before GPS was implemented.

How did the introduction of 3G technology impact mobile download speeds?

The introduction of 3G technology increased download speeds to 2 megabytes per second.

What are the two major smartphone operating systems discussed in the script?

The two major smartphone operating systems discussed are Android, which belongs to Google, and iOS, which is exclusive to Apple.

What are the advantages of using a cross-platform approach for mobile application development?

A cross-platform approach allows for the development of applications using one code base that is compatible with multiple devices or operating systems, which can be quicker and more cost-effective.

What is the client-server architecture and why is it important for understanding the internet?

The client-server architecture is a model in which clients, such as web browsers, make requests to servers for information or services, which are then provided by the server. It is important for understanding the internet because it forms the basis of how data is exchanged and accessed online.

What is the difference between a Local Area Network (LAN) and a Wide Area Network (WAN)?

A Local Area Network (LAN) connects devices within a small area like an office or a building, while a Wide Area Network (WAN) connects larger geographical areas and can span across cities, countries, or even globally.

What are the three basic processing alternatives for networking mentioned in the script?

The three basic processing alternatives for networking are centralized, decentralized, and distributed approaches.

What is the purpose of an Extranet in the context of an organization's network?

An Extranet is a network that allows specific external parties, such as customers or business partners, partial access to an organization's internal network, without granting full permissions or access to sensitive data.