• Title/Summary/Keyword: virtual transaction

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A Locking-based Transaction Management Scheme of Database Systems for Supporting Web-based Classes (웹기반 수업을 지원하는 데이터베이스 시스템의 로킹 기반 트랜잭션 관리기법)

  • Park, Chan-Jung;Kim, Han-Il
    • The Journal of Korean Association of Computer Education
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    • v.4 no.2
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    • pp.51-61
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    • 2001
  • With the advance of computer and communication technologies, a lot of virtual schools provide web-based classes that provide learning environments out of temporal and spatial constraints and many research works on the web-based classes have been proposed. Various techniques are required to build the virtual schools efficiently. One of them is the scheme for transaction management. However, existing transaction management schemes have inappropriate features for supporting web-based classes. In this paper, we propose a new locking-based transaction processing protocol that satisfies the requirements after presenting the requirements for transaction management to support web-based classes. In the protocol, a new method, called mark, is adopted to satisfy the requirements. The proposed protocol also eliminates unnecessary delays or abortions and thus, the proposed protocol can improve the performance of database systems.

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The Security Risk and Countermeasures of Blockchain based Virtual Currency Trading (블록체인 기반 가상화폐 거래의 보안 위험 및 대응방안)

  • Chung, Young-Seek;Cha, Jae-Sang
    • The Journal of Korea Institute of Information, Electronics, and Communication Technology
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    • v.11 no.1
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    • pp.100-106
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    • 2018
  • Since the concept of virtual currency called Bitcoin was announced in 2008, the blockchain technology, which is the basis of Bitcoin, is attracting attention as an important platform technology in the era of the 4th industrial revolution that can change our society in the future. Although Existing electronic financial transactions store and manage all transaction history at a reliable central organization such as government and bank, blockchain-based electronic financial transactions are composed of a distributed structure in which all participants participating in the transaction store and manage the transaction history, it is possible to secure transaction transparency while reducing system construction and operation costs. Besides the virtual currency that started with bit coins, the technology of these blockchains has been extended in various fields such as smart contracts and document management. The key technology area of this blockchain is security based on proven cryptographic technology to make it difficult to forge and hack, but there are security risks such as security vulnerabilities in the virtual currency trading service, We will discuss security risks in using virtual currency and discuss countermeasures. Especially security accidents of virtual currency exchanges are occurring frequently recently, the damage of users who trade the virtual currency is also increasing, we propose security threats and security countermeasures against virtual currency exchanges.

A Study on Transaction Service of Virtual Real Estate based on Metaverse (메타버스 기반 가상부동산 거래 서비스 연구)

  • Yoo, Jongyoung
    • The Journal of the Institute of Internet, Broadcasting and Communication
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    • v.22 no.2
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    • pp.83-88
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    • 2022
  • The purpose of this study is to present an analysis and implications for the metaverse-based virtual real estate transaction service. Through blockchain-based technology and metaverse, the world we live in is expanding naturally. Therefore, changes in the environment and perceptions of market participants are also very important factors. The concept and thinking about the existing asset value change and investment are also changing. This means that you can generate profits through value and investment in intangible assets. The service user aspect is a case of investing in the future value of virtual real estate that if more users participate rather than the present value, the principle of supply and demand will be applied to increase the number of consumers and the price will naturally rise according to the principle of scarcity. The service provider provides a technical platform for the service to directly transact the portion of the virtual area considered of interest directly through the virtual real estate purchase business. As the number of participants increases as well as funds and transaction fees, various revenue models such as advertisements can be discovered and provided. It plays the role of providing jobs and information through new services. As a stakeholder, governments can exploit the emergence of new technologies and products to create people and services and secure economic benefits. Of course, various institutional supports should be provided so that new services can settle in the market while mitigating risk factors. This study is meaningful in that it contributes to the establishment of a domestic metaverse-based environment and related research and is utilized in the study of virtual space real estate services.

SOC Bus Transaction Verification Using AMBA Protocol Checker

  • Lee, Kab-Joo;Kim, Si-Hyun;Hwang, Hyo-Seon
    • JSTS:Journal of Semiconductor Technology and Science
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    • v.2 no.2
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    • pp.132-140
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    • 2002
  • This paper presents an ARM-based SOC bus transaction verification IP and the usage experiences in SOC designs. The verification IP is an AMBA AHB protocol checker, which captures legal AHB transactions in FSM-style signal sequence checking routines. This checker can be considered as a reusable verification IP since it does not change unless the bus protocol changes. Our AHB protocol checker is designed to be scalable to any number of AHB masters and reusable for various AMBA-based SOC designs. The keys to the scalability and the reusability are Object-Oriented Programming (OOP), virtual port, and bind operation. This paper describes how OOP, virtual port, and bind features are used to implement AHB protocol checker. Using the AHB protocol checker, an AHB simulation monitor is constructed. The monitor checks the legal bus arbitration and detects the first cycle of an AHB transaction. Then it calls AHB protocol checker to check the expected AHB signal sequences. We integrate the AHB bus monitor into Verilog simulation environment to replace time-consuming visual waveform inspection, and it allows us to find design bugs quickly. This paper also discusses AMBA AHB bus transaction coverage metrics and AHB transaction coverage analysis. Test programs for five AHB masters of an SOC, four channel DMAs and a host interface unit are executed and transaction coverage for DMA verification is collected during simulation. These coverage results can be used to determine the weak point of test programs in terms of the number of bus transactions occurred and guide to improve the quality of the test programs. Also, the coverage results can be used to obtain bus utilization statistics since the bus cycles occupied by each AHB master can be obtained.

Accurate Transmission Loss Allocation Algorithm Based on the Virtual Transaction Strategy: Comparison of Path-integral with Discrete Integral Methods

  • Min, Kyung-Il;Moon, Young-Hyun
    • Journal of Electrical Engineering and Technology
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    • v.5 no.4
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    • pp.511-521
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    • 2010
  • This paper presents a new algorithm to determine accurate bus-wise transmission loss allocation utilizing path-integrals dictated by the transaction strategy. For any transaction strategy, the total sum of the allocated transmission losses of all buses is equal to the actual loss given by the AC power-flow calculation considering the distributed slack. In this paper, the bus-wise allocation of the transmission loss is calculated by integrating the differential loss along a path determined by the transaction strategy. The proposed algorithm is also compared with Galiana's method, which is the well-known transmission loss allocation algorithm based on integration. The performance of the proposed algorithm is evaluated by case studies carried out on the WSCC 9-bus, IEEE 14-bus, New England 39-bus, and IEEE 118-bus systems. The simulation results show that the proposed algorithm is fast and accurate with a large step size.

The Real-Time Virtual Environment Control Using Haptic Interface System (촉각시스템을 이용한 실시간 가상환경제어)

  • Kang, Won-Chan;Kim, Young-Dong
    • The Transactions of the Korean Institute of Electrical Engineers P
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    • v.52 no.3
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    • pp.121-126
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    • 2003
  • In this paper, we propose the haptic system for the real-time virtual environment-control, which controls the sense of sight, hearing and touch. In order to maintain the stable haptic system in this study, we apply the proxy force rendering algorithm and the real-time graphic deformation algorithm based on the FEM. The applied proxy algorithm makes the system possible to be more stable and prompt with a virtual object. Moreover, the haptic rendering algorithm is applied to work out a problem that the tactual transaction-period is different from the graphic transaction- period. The graphic deformation algorithm is developed in the real-time using the deformed FEM. To apply the FEM, a deformed material-model is produced and then the graphic deformation with this model is able to force. Consequently, the graphic rendering algorithm is deduced by the real-time calculation and simplification because the purpose of this system is to transact in the real time. Applying this system to the PC, we prove that it is possible to deform the graphics and transact the haptic. Finally we suggest the variable simulation program to show the efficiency of this system.

Transaction Pattern between Real Life and Games Centered on Players (플레이어의 현실과 게임내의 교류패턴)

  • Hyun, Hye-Jung;Ko, Il-Ju
    • The Journal of the Korea Contents Association
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    • v.12 no.4
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    • pp.95-107
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    • 2012
  • Communication skill to maintain personal relationships is a crucial factor in our social life. However, even though a number of people are experiencing difficulty in communication owing to their poor interpersonal interchanges in real life, they are interacting with virtual characters in artificially created virtual space. In order to remedy such a lack of communication among game players, first, they need to search appropriate ways to communicate each other in real life, but not in virtual space, or to create a game space as a new place for interaction among them by utilizing advantages of the game world. To accomplish such an aim, it is necessary to precede the research on what kind of relations or characteristics for game players' interaction to others in the real life and game world. For the reason, in this paper, we investigate interaction patterns of game players in real life and in the virtual space. In order to perform this investigation, an ego-gram, which demonstrates the pattern of the ego states as a field-oriented approach is used as the research method. The result shows that there are differences between patterns in each spaces. so, we apply a factor analysis and analyse the relationship between the transaction pattern of players in two spaces using the ego-gram.

Research on A Comprehensive Study on Building a Zero Knowledge Proof System Model (영지식 증명 시스템 구축 연구)

  • Sunghyuck Hong
    • Advanced Industrial SCIence
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    • v.3 no.3
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    • pp.8-13
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    • 2024
  • Zero Knowledge Proof (ZKP) is an innovative decentralized technology designed to enhance the privacy and security of virtual currency transactions. By ensuring that only the necessary information is disclosed by the transaction provider, ZKP protects the confidentiality of all parties involved. This ensures that both the identity of the transacting parties and the transaction value remain confidential.ZKP not only provides a robust privacy function by concealing the identities and values involved in blockchain transactions but also facilitates the exchange of money between parties without the need to verify each other's identity. This anonymity feature is crucial in promoting trust and security in financial transactions, making ZKP a pivotal technology in the realm of virtual currencies. In the context of the Fourth Industrial Revolution, the application of ZKP contributes significantly to the comprehensive and stable development of financial services. It fosters a trustworthy user environment by ensuring that transaction privacy is maintained, thereby encouraging broader adoption of virtual currencies. By integrating ZKP, financial services can achieve a higher level of security and trust, essential for the continued growth and innovation within the sector.

A Study of the real-time graphic deformation algorithm with virtual environment control (가상환경 제어에서 실시간 그래픽 변형에 관한 연구)

  • Kim, Young-Su;Bae, Chul;Kim, A-Hyun;Park, Kyung-Seok;Kang, Won-Chan;Kim, Young-Dong
    • Proceedings of the KIEE Conference
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    • 2003.07d
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    • pp.2265-2267
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    • 2003
  • In this paper, the virtual reality system is tried to developed, which controls not only the sense of sight and hearing but also the sense of touch, In order to develope the sense of touch in this study, the stable tactual transaction system, based on summing up the basic algorithm and theory is embodied. Especially, the graphic deformation algorithm is developed in realtime with using the deformed FEM. To apply the FEM, a deformed material model is produced and then the graphic deformation with this model is able to force. Finally, the graphic transaction algorithm is deduced by the realtime calculation and simplification because the purpose of this system is to transact in real time. The result of this study is that the proposed system is possible to deform the graphics and transact the haptic in real time in PC. The simulation program has been made to prove this result.

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The Virtual Environment Control using Real-time Graphic Deformation Algorithm (실시간 그래픽 디포메이션 알고리즘을 이용한 가상환경젱어)

  • 강원찬;김남오;최창주
    • The Transactions of the Korean Institute of Electrical Engineers D
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    • v.53 no.5
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    • pp.309-314
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    • 2004
  • In the established virtual-reality system, although it is possible to transact a faculty of sensation and graphic in a single PC, virtual object forcibly treated with rigid body for the reason of the huge amount of calculation, and the number of polygon is restricted. Furthermore, there is some difficulty in the financial aspect and a program field, because the existing virtual-reality system needs at least two workstations or super computers. In this study, the new force-reflecting algorithm called as "Proxy" and a finite element method of Hyperion are applied to this system in order to transact in real-time. Consequently, though the number of polygon, which brings about an obstacle is increased in the real-time graphic transaction, this system makes it possible to transact in the real-time, not being influenced by the size of the virtual object.