• Title, Summary, Keyword: Smart Contract

Search Result 108, Processing Time 0.056 seconds

Improved Ad Hoc On-demand Distance Vector Routing(AODV) Protocol Based on Blockchain Node Detection in Ad Hoc Networks

  • Yan, Shuailing;Chung, Yeongjee
    • International Journal of Internet, Broadcasting and Communication
    • /
    • v.12 no.3
    • /
    • pp.46-55
    • /
    • 2020
  • Ad Hoc network is a special wireless network, mainly because the nodes are no control center, the topology is flexible, and the networking could be established quickly, which results the transmission stability is lower than other types of networks. In order to guarantee the transmission of data packets in the network effectively, an improved Queue Ad Hoc On-demand Distance Vector Routing protocol (Q-AODV) for node detection by using blockchain technology is proposed. In the route search process. Firstly, according to the node's daily communication record the cluster is formed by the source node using the smart contract and gradually extends to the path detection. Then the best optional path nodes are chained in the form of Merkle tree. Finally, the best path is chosen on the blockchain. Simulation experiments show that the stability of Q-AODV protocol is higher than the AODV protocol or the Dynamic Source Routing (DSR) protocol.

An Activation Plan of Electronic Contract Real Estate

  • Youn, Sung-Ho
    • Journal of the Korea Society of Computer and Information
    • /
    • v.21 no.10
    • /
    • pp.175-182
    • /
    • 2016
  • In the 21st century knowledge and information society, Electronic Contracts made with the intention of electronic computer information networks are emerging as a new legal problem which can not be solved in the conventional legal system governing contracts. In other words, the indicator's decision determines the effect and formation of the contracts in the face-to-face or written contracts but electronic decision through computer information network is established the working process of electronic signals-electronic contracts are not only difficult to separate the decision-making process but questioned to be solved by the theory of the general legal action. Ministry of Transportation is scheduled to introduce real estate sales and lease contract using a variety of electronic devices such as computer, tablet PC, smart phones and so on without a paper contract. This system is conducted to global expansion of Seoul in demonstration zone on May 8, 2016 and will be implemented nationwide in the second half of 2017. Electronics contract Real estate has some benefits because made by linking electronic contract system and the electronic registration system - the economic effects discounts on various kinds of fees, the prevention from real estate fraud beforehand and the solution to the complexity of the process the seller and the buyer visits The Real estate agency. However, it has some problem- the disorder in the real estate contract market, the occurrence of the real estate agency accident and the author of the electronic real estate contracts have limited only to realtor. In this paper, I suggest the activation plan to search for establishment and effect of electronic contracts and declaration of intention in electronic depending on the Electronic Contract Real Estate system.

Delivery Tracing Protect Model Based Smart Contract for Guaranteed Anonymity (익명성 보호를 위한 스마트 컨트랙트의 배송추적 방지 모델)

  • Kim, Young Chan;Kim, Young Soo;Im, Kwang Hyuk
    • Journal of Industrial Convergence
    • /
    • v.16 no.1
    • /
    • pp.15-20
    • /
    • 2018
  • Along with the increase of internet shopping, crimes that exploited personal information on the invoice of goods are becoming more and more advanced and becoming more and more classified from the interception of goods through voice phishing attack, injury, sexual offense. Therefore, in order to guarantee the anonymity of the customer's delivery information, there is a need for a delivery tracking prevention system which keeps the route information of the product's destination secret among delivery companies. For this purpose, We suggest that delivery tracing protect model based smart contract for guaranteed anonymity to protect the anonymity by encrypting delivery information and by separation of payment and personal information using the anonymity technique of block chain-based cryptography. Our proposed model contributes to expansion of internet shopping based on block chaining by providing information about product sales to company and guaranteeing anonymity of customer's delivery information to customer.

Access Control Mechanism for Industrial Control System Based Smart Contract (스마트 컨트랙트 기반의 산업제어시스템 접근 제어 메커니즘)

  • Cho, Minjeong;Lee, Changhoon
    • Journal of the Korea Institute of Information Security & Cryptology
    • /
    • v.29 no.3
    • /
    • pp.579-588
    • /
    • 2019
  • Industrial control systems consist of various physical devices such as sensors, actuators. Security Infringement such as waterworks facilities Remote Access Infringement and power control systems Infection have been occured by vulnerability of Access Control. Access control to physical devices must be fulfilled with a reliable system. However, Having a single access control system inside company can not guarantee reliability. In addition, when single access control is struggled with error or infringement, access control system is totally unavailable. so system requires a additional access control method or system. In this paper, we proposed access control mechanism for reliable and stable operation using blockchain and smart contract. Proposed Mechanism using trust score to consider resources to be consumed depending on each industrial environment in consideration of the industrial control system where availability is more important than integrity and confidentiality. Unlike other blockchain-based access control system, proposed system is designed for the currently operating industrial control system.

An Online Voting System based on Ethereum Block-Chain for Enhancing Reliability (신뢰성 향상을 위한 이더리움 블록체인 기반의 온라인 투표 시스템)

  • Kim, Chul-Jin
    • Journal of the Korea Academia-Industrial cooperation Society
    • /
    • v.19 no.4
    • /
    • pp.563-570
    • /
    • 2018
  • Existing online voting is not being used for public elections due to uncertainty about security threats, and offline voting costs a lot of money. As an alternative, blockchain is emerging. Applying blockchain technology to online voting will ensure transparency and confidentiality, because voter information and aggregate information are distributed and managed. Since a blockchain distributes the voting information, it will be more secure than existing central server - based online voting systems. If blockchain technology is applied to public elections, and the transparency and confidentiality of the voting information is guaranteed, the cost of voting will be greatly reduced. This paper tries to apply to an online voting system the Ethereum platform from among the blockchain technologies. Ethereum is a highly scalable blockchain technology that provides a smart contract based on the Solidity language to develop an online voting contract and to distribute the contract to each voter. Each voter votes on the contract that has been distributed, and the votes are distributed to other voters. The experiment verifies the consistency of the stored voting information.

A State Machine Design Pattern for Secure Ethereum Dapp (안전한 이더리움 분산 어플리케이션 개발을 위한 스테이트 머신 기반의 디자인 패턴)

  • Eom, Hyun-min;Lee, Myung-Joon
    • Proceedings of the Korean Society of Computer Information Conference
    • /
    • /
    • pp.389-390
    • /
    • 2019
  • 최근 블록체인 기반의 어플리케이션이 증가하고 이들을 위한 스마트 컨트랙트가 설계상 오류로 부적절하게 사용될 가능성이 증대되고 있다. 따라서 스마트 컨트랙트의 설계를 보다 안전하게 지원할 수 있는 방안이 필요한 실정이다. 본 논문에서는 State machine을 이용하여 이더리움 스마트 컨트랙트의 기능사용을 보다 안전하게 지원하기 위한 기법을 제안한다. 제안된 기법은 전체 동작의 흐름의 제어하기 위한 Transition Contract와 각각 상태에 대한 스마트 컨트랙트인 State Contract를 이용하여 스마트 컨트랙트의 동작과정을 제어한다.

  • PDF

Forisome based biomimetic smart materials

  • Shen, Amy Q.;Hamlington, B.D.;Knoblauch, Michael;Peters, Winfried S.;Pickard, William F.
    • Smart Structures and Systems
    • /
    • v.2 no.3
    • /
    • pp.225-235
    • /
    • 2006
  • With the discovery in plants of the proteinaceous forisome crystalloid (Knoblauch, et al. 2003), a novel, non-living, ATP-independent biological material became available to the designer of smart materials for advanced actuating and sensing. The in vitro studies of Knoblauch, et al. show that forisomes (2-4 micron wide and 10-40 micron long) can be repeatedly stimulated to contract and expand anisotropically by shifting either the ambient pH or the ambient calcium ion concentration. Because of their unique abilities to develop and reverse strains greater than 20% in time periods less than one second, forisomes have the potential to outperform current smart materials as advanced, biomimetic, multi-functional, smart sensors or actuators. Probing forisome material properties is an immediate need to lay the foundation for synthesizing forisomebased smart materials for health monitoring of structural integrity in civil infrastructure and for aerospace hardware. Microfluidics is a growing, vibrant technology with increasingly diverse applications. Here, we use microfluidics to study the surface interaction between forisome and substrate and the conformational dynamics of forisomes within a confined geometry to lay the foundation for forisome-based smart materials synthesis in controlled and repeatable environment.

A Study On the Safety Management of construction equipment Using Smart Phone Technology (Focused on poclain and mobile elevated work platform) ("스마트폰" 기반을 활용한 건설장비 안전관리에 관한 연구 (굴삭기, 고소작업대중심으로))

  • Jo, Jeong-Ho;Im, Jae-Chang;Go, Yeong-Uk;Gang, Gyeong-Sik
    • Proceedings of the Safety Management and Science Conference
    • /
    • /
    • pp.43-59
    • /
    • 2012
  • As contemporary building construction type is getting higher and deeper,construction equipment usage is getting more, and related fatal accidents are on an increasing trend. In these days, due to the deteriorating construction business circumstance, job finding problem of equipment operator, and dumping contract, equipment lease suppliers are putin jeopardy. In high-rise building construction, especially tower crane, mobile elevated work platform and other High place operation cars among construction equipment cause many critical accidents because of drop supply of construction biding bringing out dumping contract could cause unsafe and poor construction management. Because of this, a method was drawn which could grasp the present state of construction equipment management and manage safety of the equipment more easily for accident prevention by choosing 2 kinds of Construction equipment which cause safety accident frequently among the equipment mainly used in construction site. This study suggested a method about construction equipment safety management using "smart phone" base which could be used in safety management for construction equipment by whomever in construction site. After attachment of QR code included safety checklist, It became possible that site managers could check more efficiently by scanning with their smart phone when they inspect equipment. Moreover, by the construction interested who didn't know what and how they have to inspect could point out unsafe condition in the early stage of equipment entering or take unsafe one out of the site by using new smart phone safety checking system is installed, it became possible that critical accident caused by construction equipment was prevented in advance.

  • PDF

Apply Blockchain to Overcome Wi-Fi Vulnerabilities

  • Kim, Seong-Kyu (Steve)
    • Journal of Multimedia Information System
    • /
    • v.6 no.3
    • /
    • pp.139-146
    • /
    • 2019
  • This paper, wireless internet such as Wi-Fi has a vulnerability to security. Blockchain also means a 'Ledger' in which transaction information that occurs on a public or private network is encrypted and shared among the network participants. Blockchain maintains information integrity by making it impossible for a particular node to tamper with information arbitrarily, a feature that would result in changes in the overall blockchain hash value if any one transaction information that constitutes a block was changed. The complete sharing of information through a peer-to-peer network will also cripple hacking attempts from outside, targeting specialized nodes, and prepare for the "single point of failure" risk of the entire system being shut down. Due to the value of these Blockchain, various types of Blockchain are emerging, and related technology development efforts are also actively underway. Various business models such as public block chains such as Bitcoin, as well as private block chains that allow only certain authorized nodes to participate, or consortium block chains operated by a select few licensed groups, are being utilized. In terms of technological evolution, Blockchain also shows the potential to grow beyond cryptocurrency into an online platform that allows all kinds of transactions with the advent of 'Smart Contract'. By using Blockchain technology, the company makes suggestions to overcome the vulnerability of wireless Internet.

A Survey on Blockchain Platforms for Supply Chain Management (공급망을 위한 블록체인 플랫폼 조사연구)

  • Jang, Jihyun;Song, Seounghan;Kim, Suntae
    • The Journal of The Institute of Internet, Broadcasting and Communication
    • /
    • v.18 no.5
    • /
    • pp.259-265
    • /
    • 2018
  • As the supply method of products has become diverse and complex, problems such as manipulation of origin and product trace have occurred in the existing supply chain system. In order to deal with these issues, various Blockchain based studies have been actively carried in the SW industry and academy. However, there is a lack of comprehensive survey research on the applied Blockchain techniques, so that it hardly understand the pros and cons of the technologies. In this study, we intensively investigated the diverse studies from the Industrial and academic area based on the several criteria such as the goals, use of key Blockchain technologies, and IoT technologies.