In the beginning, computers are developed in need of complex computing. And it has been evolved from mainframes in enterprise and computer center to desktop at home. After the rapidly spreading of internet, computer undertakes an important role in people¡¦s life. It helps us with our work, doing computation, even links people together through E-mail and instant message software. With computers by our side, we live a much more convenient life. Google announced its latest mobile platform operating system ¡§Android¡¨ on November 5th, 2007. Android is constructed base on Linux kernel, which means it can be treated as a portable computer, with application designed for entertaining, Internet surfing, and social communication. Social communication has been proven to be a important issue. For instance, Facebook, a social network service provider online since February 4th, 2004, creates a place to let people share their messages, photos and news, has more than ten million user today. So far the mobile phone has become a very convenient way to communicate, but if users wish to share photos, music or documents to friends. This thesis is going to discover a new way to share views, photos, music with friends immediately. This paper describes the issues with data synchronization between mobile phones.

Data synchronization is the problem of bringing multiple versions of the same data on different remote devices to the most up to date version. This thesis looks into the particular problem of key-value storage systems synchronization between mobile devices in a peer-to-peer environment. In this research, we describe, implement and evaluate a new key-value storage system synchronization algorithm using a 2-phase approach, combining approximate synchronization in the first phase and exact synchronization in the second phase. The 2-phase architecture helps the algorithm achieve considerable boost in performance in all three major criteria of a data synchronization algorithm, namely synchronization time, processing time and communication cost, while still being suitable to operate in a peer-to-peer environment. The performance increase makes it feasible to employ database synchronization technique in a wider range of mobile applications, especially those operating on a slow peer-to-peer network.

This job is considered about mobile technologies, and mobile devices data synchronization problem. Presented trading agent‘s mobile work places and server data synchronization solution, wich was developed using free software.

Today, it is a major issue for mobile applications to maintain a replica state of the server on mobile devices. This creates the need to keep data on both the server and the mobile. In such cases, when the data changes on the server, the new state of the data has to be updated on the mobile in order to maintain a consistent view of the data flow. However, mobile devices communicate over wireless mediums (.e.g., Bluetooth, Wi-Fi, 3.5G/4G, etc.) which can experience intermittent connectivity. The volatility of the network is also influenced by low-bandwidth. The direct effects of these issues are high latency and inconsistency issues between the data on the mobile clients and the remote servers. In this work, I present a detail review on the topic of data synchronization in mobile networks. Then, a generic architecture called MobiQ is proposed which can keep working in an offline mode to record local modifications and can synchronize with the remote servers when connectivity is restored. This is achieved through the proposal of an efficient synchronization protocol which combines different synchronization and replication strategies. Moreover, the MobiQ framework provides a secured environment to work with data. The implemented architecture is designed and tested in mobile questionnaire system and the result is encouraging.

Abstract As the Internet and wireless technologies become mature, people may use more than one digital device to manage their personal data. However, the complexities and difficulties in personal information management will arise due to various devices and heterogeneous platforms. To cope with this problem, we design an intelligent architecture for personal information management based on the XML-RPC technology, which allows the software running on disparate operating systems and in different environments to make procedure calls over the Internet. We also implement an information server to manage the whole data and handle the synchronization process. The system provides users a simple and convenient environment to manage and synchronize their personal information. Besides, the group facility in this system makes the people in the same group or community capable of sharing their information more easily.

The goal of this thesis is to design and implement a library for data synchronization between multiple client's devices in the context of the ecosystem of a single application targeting the iOS, iPadOS or MacOS operating system. The work focuses on the simple integration of the library into existing applications using the Realm database system and on the simple way to connect the user interface with the synchronization process. I solved the chosen problem by designing a synchronization protocol primarily based on log synchronization to distribute changes between the client and the server, implementing a library to monitor changes in the client's database and distribute them to the server, and implementing a server library to integrate received changes and distribute them with help of notifications. The solution provides an easy way to implement data synchronization between multiple devices using custom database server and with the ability to define how to handle new changes of objects presented in the user interface during the synchronization. Created library can be quickly and easily integrated and thus effectively speed up the application development process.

Information synchronization problems are analyzed in this thesis. Two aspects are being surveyed – clock synchronization, algorithms and their use, and data synchronization and maintaining the functionality of software at the times, when connection with database is broken. Existing products, their uses, cons and pros are overviewed. There are suggested models, how to solve these problems, which were implemented in “Distributed basketball competition registration and analysis software system”, and other theoretical solutions. Synchronization models are compared with other available solutions, the detail algorithms and methods are reviewed in this document.

abstract: Mobile data collection (MDC) applications have been growing in the last decade especially in the field of education and research. Although many MDC applications are available, almost all of them are tailor-made for a very specific task in a very specific field (i.e. health, traffic, weather forecasts, …etc.). Since the main users of these apps are researchers, physicians or generally data collectors, it can be extremely challenging for them to make adjustments or modifications to these applications given that they have limited or no technical background in coding. Another common issue with MDC applications is that its functionalities are limited only to data collection and storing. Other functionalities such as data visualizations, data sharing, data synchronization and/or data updating are rarely found in MDC apps. This thesis tries to solve the problems mentioned above by adding the following two enhancements: (a) the ability for data collectors to customize their own applications based on the project they’re working on, (b) and introducing new tools that would help manage the collected data. This will be achieved by creating a Java standalone application where data collectors can use to design their own mobile apps in a userfriendly Graphical User Interface (GUI). Once the app has been completely designed using the Java tool, a new iOS mobile application would be automatically generated based on the user’s input. By using this tool, researchers now are able to create mobile applications that are completely tailored to their needs, in addition to enjoying new features such as visualize and analyze data, synchronize data to the remote database, share data with other data collectors and update existing data. / Dissertation/Thesis / Masters Thesis Computer Science 2016

This master thesis deals with a topic of master data quality at retailers and suppliers of fast moving consumer goods. The objective is to map a flow of product master data in FMCG supply chain and identify what is the cause bad quality of the data. Emphasis is placed on analyzing a listing process of new item at retailers. Global data synchronization represents one of the tools to increase efficiency of listing process and improve master data quality. Therefore another objective is to clarify the cause of low adoption of global data synchronization at Czech market. The thesis also suggests some measures leading to better master data quality in FMCG and expansion of global data synchronization in Czech Republic. The thesis consists of theoretical and practical part. Theoretical part defines several terms and explores supply chain operation and communication. It also covers theory of data quality and its governance. Practical part is focused on objectives of the thesis. Accomplishment of those objectives is based on results of a survey among FMCG suppliers and retailers in Czech Republic. The thesis contributes to enrichment of academic literature that does not focus on master data quality in FMCG and global data synchronization very much at the moment. Retailers and suppliers of FMCG can use the results of the thesis as an inspiration to improve the quality of their master data. A few methods of achieving better data quality are introduced. The thesis has been assigned by non-profit organization GS1 Czech Republic that can use the results as one of the supporting materials for development of next global data synchronization strategy.

In paper mills, the paper machine is followed by a winding machine which cuts paper to intended width and rolls onto cylinders to specified length. Central to this paper is the gathering and synchronizing of data from databases relevant to automation research for the winder. Part of data gathering was automated with Python and the data was analyzed to determine details about the data. Data was found to be stored in different databases and accessible through different interfaces with some variation in formatting of time strings and time zones between data sources. Other issues, likely stemming from different parts of the greater system being implemented at different times, provided by different companies utilizing different technologies. Suggestions toward streamlining of data gathering for ease of future automation and research were given with discussion of this work, the system, theory and future research.