• Title/Summary/Keyword: contracts

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A Study on Privilege Elevation Attack Management for Smart Transaction Security on BlockChain Etherium Based System

  • Min, Youn-A
    • Journal of the Korea Society of Computer and Information
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    • v.24 no.4
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    • pp.65-71
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    • 2019
  • IAs smart device penetration rate is more than 90%, mobile transaction ratio using smart device is increasing. Smart contracts are used in various areas of real life including smart trading. By applying smart contracts to the platform for smart transactions through block-chain technology, the threat of hacking or forgery can be reduced. However, various threats to devices in smart transactions can pose a threat to the use of block chain Etherium, an important element in privilege and personal information management. Smart contract used in block chain Ethereum includes important information or transaction details of users. Therefore, in case of an attack of privilege elevation, it is very likely to exploit transaction details or forge or tamper with personal information inquiry. In this paper, we propose a detection and countermeasure method for privilege escalation attack, which is especially important for block chain for secure smart transaction using block chain Ethereum. When comparing the results of this study with the results of similar applications and researches, we showed about 12~13% improvement in performance and suggested the future countermeasures through packet analysis.

APPLICATION OF CONTRACTORS' RISK PREFERENCE ON THE EVALUATION OF THE PHILIPPINE GOVERNMENT STANDARD CONTRACT

  • Visuth Chovichien;Joel Cesarius V. Reyes
    • International conference on construction engineering and project management
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    • 2009.05a
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    • pp.144-152
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    • 2009
  • Construction contracts involve the allocation or distribution of the risks inherent to a construction project between or among contracting parties. However, it has been a common practice that only one party drafts the contract due to practical reasons and particular policies of various organizations. Interviews were conducted on some local contractors to gain their meaningful insights and standpoints on the allocation of each risk. These results were compared with the actual risk allocation using the Philippine government standard contract and risk principles from the literature to determine if their considered opinions provide a plausible alternative. A sample application of this evaluation is presented for construction-related risks and risk allocation recommendations are provided in the end.

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Development of Review Processes and Tools for Liquidated Damages for EPC/Turnkey Project: Contractor's Perspective

  • Hahn, Ki Jeong;Lee, Eul-Bum;Kim, Young Ho
    • International conference on construction engineering and project management
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    • 2015.10a
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    • pp.718-719
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    • 2015
  • As a recent global trend, the majority of plant projects are delivered through EPC or EPC-turnkey contracts, where a contractor's liability is more complicated because of the mega size scale and financing method. Previous researches have been lacking a practical usability for project members for liabilities of contracts. Those were focused on solving the claims or schedule calculation issues only. The objective of the present study was to develop a validation process for LDs (liquidated damages) in contractor's liabilities with various case studies and expert judgments. As summarized in this paper, the processes and tools were developed with project life cycle process. The project preparation phase includes 3 step check lists to determine the Go or No-go for projects. In progress phase, contractors should focus on the response strategies for claims with liabilities. The study concludes that those developed processes and tools will help to manage risk of LDs for the contractors in the overseas projects.

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Why is the Interest in Blockchain Still on the Decline? Blockchain Challenges, Review, and Research Agenda

  • Kumar Saurabh;Neelam Rani;Ridhi Arora;Debasisha Mishra;Ramkumar M.
    • Asia pacific journal of information systems
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    • v.32 no.2
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    • pp.191-225
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    • 2022
  • Based on its technological elements (distribution, encryption, immutability, tokenisation, decentralisation, and smart contracts), blockchain has drawn considerable attention in various industries and verticals. Still, the strategic adoption of blockchain is in its early stages because of the current barriers and challenges in the areas of 'customer experience', 'business models', and 'operational processes.' This work delivers a comprehensive synopsis of the fundamental challenges faced by blockchain adopters in their digital journey, based on a literature survey. The authors leveraged MAXQDA software and the theory, context, characteristics, and methodology (TCCM) framework to develop themes, findings, and evidence for adoption barriers. The research evaluates the literature on blockchain adoption challenges and offers research insights and managerial agendas for future inferences.

Design and Implementation of Ethereum Smart Contract State Monitoring System (이더리움 스마트 컨트랙트 상태 모니터링 시스템의 설계 및 구현)

  • Hong, Joongi;Kim, Suntae;Ryu, Duksan
    • Journal of Software Engineering Society
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    • v.28 no.2
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    • pp.1-6
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    • 2019
  • There are various stakeholders in the blockchain ecosystem. Since the emergence of Ethereum, many transactions have been made using smart contracts, and a wider range of stakeholders are participating, including not only developers, but also investors, banks, companies, and general users. However, various stakeholders have a problem in that it is difficult and complicated to check the state of smart contracts. If it becomes difficult to check the state, the reliability of the smart contract will be lowered and the utilization will be lowered. Also, if the state check is difficult and complicated for the developer, it will be difficult to provide high quality due to the difficulty of testing and debugging the smart contract developed by the developer. In this research, we propose a design and implementation method of the Ethereum Smart Contract State Monitoring System that enables various stakeholders and developers to easily and continuously check the state of smart contracts and analyze them using historical data.

Analysis of Current Operational Practices and Issues of Contract-Managed Foodservice Companies in Republic of Korea (위탁급식 전문업체의 운영 현황 조사 및 현안과제 분석)

  • Eom, Yeong-Ram;Ryu, Eun-Sun
    • Journal of the Korean Dietetic Association
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    • v.9 no.3
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    • pp.197-208
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    • 2003
  • This study was surveyed to provide the information on current operational practices and issues of contract-managed foodservice companies. Questionnaires were distributed to 79 contract-managed foodservice companies (eight large-size, 48 mid-size, 23 small-size companies) from March to May in 2002. The contract-managed foodservice companies provided averages of 269,184 (range 140,036-503,500), 14,837 (range 450-75,269), and 4,065 (range 930-8,050) meals daily from large, medium, and small-size companies, respectively. The companies managed to averages of 268.2 (160-619) foodservice contracts at large-size companies, 21.9 (5-63) contracts at mid-size companies, and 4.7 (1-10) contracts at small-size companies. The average numbers of dietitians were 298.6 (range 104-671) in large-size companies, 22.2(6-86) in mid-size companies, and 3.8(1-9) in small-size companies. The averages of sales were 156.5 billion at large-size companies, 6.7 billion at mid-size companies, and 1.7 billion at small-size companies in 2001. The contract was two types including management fee contract(5%), and profit and loss contract(95%). The cost ratios for office foodservice were 59.5% at food cost, 24.2% at labor cost, 6.3% at profit, and 10.1% at other cost. For hospital foodservice, the ratios were 54.0% at the food cost, 34.6% at labor cost, 3.0% at profit, and 11.8% at other cost. For high school foodservice, the ratios were 62.2% at the food cost, 21.5% at labor cost, 5.4% at profit, and 11.2% at other cost. When the contractors managed to the foodservice, the most important matters were the sanitation management and customer satisfaction. Also, the difficult problems were excess investment of equipments and low meal prices.

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A Study for Construction of the Monthly Rent Price Survey (월세가격동향조사 구축을 위한 연구)

  • Park, Jin-Woo;Baek, Sung-Jun;Lee, Ki-Jae
    • Survey Research
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    • v.9 no.3
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    • pp.1-21
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    • 2008
  • The housing market in Korea had mainly consisted of Maemae(purchasing market) and Chonsei(rental market). Since 1997 foreign exchange crisis, the rental housing market has experienced substantial changes in preferred rental contracts between Chonsei and monthly-rent. Even though monthly-rent has taken a substantial portion of housing rental contracts, not yet reliable monthly-rent index has been developed. Furthermore, it isn't obvious to define monthly-rent because there are many types of monthly rent structures from full-monthly-rent to monthly-rent-with-variable-deposit. This study is the basic research of developing a housing price index of monthly-rent in accordance with the existing price index of Maemae and Chonsei in Korea. This research has been carried out with the following contents: (1) Constructing the actually desirable concept of monthly-rent through examining monthly-rental market in Korea. (2) Selecting the reasonable method to investigate monthly-rental market, especially monthly-rent-with-variable -deposit. (3) Designing monthly-rental market samples and calculating the price index of monthly-rent based on 2005 Census.

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A Study for the Efficiency Analysis on Big Deals of Electronic Journal (전자저널 빅딜계약의 효율성 분석 연구)

  • Kim, Jeong-Hwan;Lee, Eung-Bong
    • Journal of the Korean Society for Library and Information Science
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    • v.47 no.4
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    • pp.187-210
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    • 2013
  • The consumption through e-journal consortia makes researchers locate and use academic resources and information extensively with comparatively cheap costs. This study analyzed and investigated substantive benefits of the big deal contracts for e-journal subscriptions in terms of efficient information use. In other words, this study compare concretely the differences in efficiency of using information between large-size institutions and small-size institutions who participate in the e-journal big deal contracts. This study suggests solutions for the problems which occur persistently and repeatedly in the big deal and new counter plans which can replace the current methods of big deal contracts in a long-term perspective by revealing the gaps of acquiring and using information by the size of participating institutions.