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Dew computing is an information technology (IT) paradigm that combines the core concept of cloud computing with the capabilities of end devices (personal computers, mobile phones, etc.). It is used to enhance the experience for the end user in comparison to only using cloud computing. Dew computing attempts to solve major problems related to cloud computing technology, such as reliance on internet access. Dropbox is an example of the dew computing paradigm, as it provides access to the files and folders in the cloud in addition to keeping copies on local devices. This allows the user to access files during times without an internet connection, and when a connection is established again, synchronizing the files and folders back to the cloud server.
While cloud computing has been expanding rapidly, other models based on cloud computing have emerged, including fog computing, Edge computing, dew computing, etc. Proponents claim these novel models can provide better experiences for users.
Cloud computing provides universal access and scalability. However, the challenges related to having all the resources far from a user's control occasionally cause problems. In the classic cloud computing paradigm, when the internet connection to the servers is lost, the user is unable to access their data; dew computing aims to solve this problem.
The term "dew computing," as used in information technology, first appeared in 2015 in IT literature and from then on has been a field of interest. The cloud-dew architecture was proposed as a possible solution to the offline data accessibility problem.
As an information technology paradigm, dew computing, using the core concept of cloud computing, seeks to use the capabilities of personal computers along with cloud services in a more reliable manner.
The key features of dew computing are independence and collaboration. Independence means that the local device must be able to provide service without continuous connection to the Internet. Collaboration means that the application must be able to connect to the cloud service and synchronize data when appropriate.
Use of the word "dew" reflects natural phenomena: clouds are far from the ground, fog is closer to the ground, and dew is on the ground. Analogically, cloud computing is a remote service, fog computing is beside the user, and dew computing is at the user end.
To establish a cloud-dew architecture on a PC, a dew virtual machine (DVM) is needed. The DVM is an isolated environment for executing the dew server on the local PC, and it consists of at least three components: dew server (DS), data analytics server (DAS), and artificial intelligence of the dew (AID).
- Dew server (DS): The DS acts like the cloud service on the local PC. It interacts with and periodically synchronizes contents with the cloud service.
- Dew analytics server (DAS): Dew analytics server collects data from usage of the dew server.
- Artificial intelligence of the dew (AID): After receiving data from the DAS about usage patterns, the AID uses the data to customize and tailor the dew server to the user to enhance their experience.
The dew computing categories are classified based on the application field.
- Web in Dew (WiD)
- Storage in Dew (SiD)
- The storage of the local device is partially or fully copied into the cloud. A good example of this is DropBox in which a user can create a folder in the cloud and have access to the folder and its contents on the local device once the synchronization has completed. Since the user can access the files at any time without the need for constant Internet access, this category meets the independence feature of dew computing. SiD also meets the collaboration feature because the folder and its contents automatically synchronize with the cloud service.
- Database in Dew (DBiD)
- The local device and the cloud both store copies of the same database. One of these two databases is considered the main version and can be defined as such by the database administrator. This service increases the reliability of a database since one of the databases can act as the backup for the other.
- Software in Dew (SiD)
- Platform in Dew (PiD)
- A software development suite must be installed on the local device with the settings and application data synchronized to the cloud service. A Software Development Kit on its own does not satisfy these requirements; it must be able to synchronize development data, system deployment data, and online backups. An example of this category is GitHub.
- Infrastructure as Dew (IaD)
- The local device is dynamically supported by cloud services. IaD can come in different forms, but at least the following two forms can be used: (1) the local device can have an exact duplicate DVM instance in the cloud, which is always kept in the same state as the local instance; (2) the local device can have all its settings/data saved in the cloud, including system settings/data and data for each application.
- Data in Dew (DiD)
Dew computing faces a number of technical challenges, including issues related to power management, processor utility, data storage, viability of operation system, network model, communication model, programming principles, dew recommender engine, local dew network, personal high productivity, database security, and behaviors of the browser.
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