Decentralized Database System Research Articles

Efficiently Supporting Multi-Level Serializability in Decentralized Database Systems

Efficiently Supporting Multi-Level Serializability in Decentralized Database Systems

An Implementation of Trust Chain Framework with Hierarchical Content Identifier Mechanism by Using Blockchain Technology.

Advances in information technology (IT) and operation technology (OT) accelerate the development of manufacturing systems (MS) consisting of integrated circuits (ICs), modules, and systems, toward Industry 4.0. However, the existing MS does not support comprehensive identity forensics for the whole system, limiting its ability to adapt to equipment authentication difficulties. Furthermore, the development of trust imposed during their crosswise collaborations with suppliers and other manufacturers in the supply chain is poorly maintained. In this paper, a trust chain framework with a comprehensive identification mechanism is implemented for the designed MS system, which is based and created on the private blockchain in conjunction with decentralized database systems to boost the flexibility, traceability, and identification of the IC-module-system. Practical implementations are developed using a functional prototype. First, the decentralized application (DApp) and the smart contracts are proposed for constructing the new trust chain under the proposed comprehensive identification mechanism by using blockchain technology. In addition, the blockchain addresses of IC, module, and system are automatically registered to InterPlanetary File System (IPFS), individually. In addition, their corresponding hierarchical CID (content identifier) values are organized by using Merkle DAG (Directed Acyclic Graph), which is employed via the hierarchical content identifier mechanism (HCIDM) proposed in this paper. Based on insights obtained from this analysis, the trust chain based on HCIDM can be applied to any MS system, for example, this trust chain could be used to prevent the counterfeit modules and ICs employed in the monitoring system of a semiconductor factory environment. The evaluation results show that the proposed scheme could work in practice under the much lower costs, compared to the public blockchain, with a total cost of 0.002094 Ether. Finally, this research is developed an innovation trust chain mechanism that could be provided the system-level security for any MS toward Industrial 4.0 in order to meet the requirements of both manufacturing innovation and product innovation in Sustainable Development Goals (SDGs).

Public Distributed Decentralized System as Blockchain

Blockchain technology is very useful in multiple areas in our day-to-day world. Along with many social networking platforms there is a possibility of data theft or tampered or data leakage and hence we need our data to be secure and immutable. One of the best solutions to this problem is blockchain technology. It replaced the traditional centralized system with a distributed, decentralized database system. A centralized system requires third parties like servers, banks, or any intermediary for transactions between two users where decentralized systems do not require any central authority to work in between two users. Blockchain technology fully works on a decentralized system. By using a cryptographic consensus algorithm, we achieve privacy, security, and immutability. This paper presents the survey of the most important technology, also presents prerequisites of the technology. The purpose of this paper is too familiar with the innovative, revolutionizing technology as well as awareness of the technology. This paper gives an idea of whether we choose blockchain or not as the right solution for our application based on its characteristics, design, and implementation.

Autonomous Decentralized Database System Self Configuration Technology for High Response

Autonomous Decentralized Database System Self Configuration Technology for High Response

Timeliness Multi-Agent Coordination Technology in Autonomous Decentralized Database Systems

The turn of the century is witnessing radical changes in the way information services are spreading due to the progress of IT and the constantly increase in the number of users of the WWW. Therefore, the business market is changing its strategy for a modern online business environment. Autonomous Decentralized Database System (ADDS), based on autonomous coordinating subsystems, has been proposed as a system architecture in order to meet the innovative e-business requirements for consistency and high response among distributed database systems. Autonomy and decentralization of subsystems help achieving high response time in highly competitive situation and autonomous Mobile Agent based coordination has been proposed to achieve flexibility in a highly dynamic environment. In this paper, it is analyzed the case in which the system size increases; and a multi agent coordination, the same number of mobile agents and sites coexist in the system, is proposed for achieving the timeliness property. The response time in the system is conformed by those transactions that require coordination and those that can be satisfied immediately. In accordance, the distribution of the data in the system for coordination is a medullar issue for the improvement of the response time. A trade-off exits between these two kind of transactions depending on the coordination of the Mobile Agents, the capacity of allocating data among the sites, and as well as the distribution of the data and user requests in the system. In this sense, since the system requires high response time, a data allocation technology in which each mobile agent autonomously determine its own capacity for adjusting data among the sites is proposed. Thus, the system will adapt itself to the dynamic environment. The effectiveness of the proposed architecture and technologies are evaluated by simulation.

Construction material procurement using Internet-based agent system

Conventional material purchasing has some problems related with solicitation process, such as searching for suppliers and obtaining product data information. E-trading portals may reduce the problems; however, new problems occur due to their approaches to build a closed system with their own customers and suppliers. In this research, a decentralized database system equipped with electronic agents for material procurement is proposed. Results showed that this system can be used to assist human purchasers to carry out solicitation in identifying suppliers, searching materials, and preparing purchase orders.

Autonomous Reconfiguration Technology for High Response Time in Decentralized Database Systems

With the exponential growth of the World Wide Web in recent years and the progress of information technology, the business market is changing its strategy for a modern online business environment. Autonomous Decentralized Database System(ADDS), based on autonomous coordinating subsystems, has been proposed as a system architecture in order to meet the innovative e-business requirements. Autonomy and decentralization of subsystems help achieving high response time in highly competitive situation and an autonomous Mobile Agent based coordination has been proposed to achieve flexibility in a highly dynamic environment. Further, this paper proposes the autonomous reconfiguration technology in ADDS in order to adapt the system to changing heterogeneous requirements. Based on the complementary requirements of the subsystems, heterogeneity distribution has been defined to accomplish the reconfiguration process. This autonomous reconfiguration technology consists of autonomous division and integration of the system, based on the ever-changing situation, to assure high response time. Simulation of the proposed technology shows its effectiveness for a large scale system and rapidly evolving situations.

On timeout for global deadlock detection in decentralized database systems

The timeout mechanism for detecting global deadlock in multidatabase systems (federated systems) is shown to be viable: simple to implement and low in cost. We use probabilistic analysis to exhibit the contributing factors.

Strategy of CIM-concept Implementation for a Computer Manufacturing Company in China

CIM-concept is implemented in a microcomputer manufacturing company in southern China to boost productivity and to improve production management. Considering the real situation in Chian the implementation of CIM-concept in industry should be made step by step. Thus we start our task with practical and fundamental problems, such as inventory control, decision-making supproted production planning system and dynamic scheduling in the workshop level. The suggested strategy is from MRP I, MRP II to CIM; from function modules, subsystems to the complete system. As the first stage production process control is concerned. To adapt the microcomputer environment a decentralized database system is used instead of a central one. The communication is supported by a local area network, which is also the product of this company. The first result shows that the application is successful.