• International Journal of Internet, Broadcasting and Communication
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• 제12권3호
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• pp.189-195
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• 2020

Smart contract, one of the applications of blockchain, is expected to be used in various industries. However, there is risks of damages caused by attacks on vulnerabilities in smart contract codes. Tool support is essential to detect vulnerabilities, and as new vulnerabilities emerge and smart contract implementation languages increase, the tools must have extensibility for them. We propose a design model for extensible architecture of smart contract vulnerability detection tools that detect vulnerabilities in smart contract source codes. The proposed model is composed of design pattern-based structures that provides extensibility to easily support extension of detecting modules for new vulnerabilities and other implementation languages of smart contract. In the model, detecting modules are composed of independent module, so modifying or adding of module do not affect other modules and the system structure.

• 무역상무연구
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• 제26권
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• pp.87-111
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• 2005

The buyer must pay the price under the contract and must take delivery of the goods of contract. The buyer's obligation to pay the price includes taking such steps and such formalities under the contract. The remedial system of the rights of the seller is easier than that of the buyer, for the obligations of the former are less complicated. The seller has the right to avoid a contract provided two conditions are fulfilled : (a) the buyer must have committed a fundamental breach of contract, or (b) the additional period for performance set by the seller in the case of non-performance must have expired. A decision is more difficult to take in the case of a delay where there is no fixed-term contract, to clarify the situation the seller may set a Nachfrist. It is essential that the contracting parties in Korea should understand the provisions of CISG.

• 한국항해학회지
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• 제17권2호
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• pp.107-119
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• 1993

When the breach of contract is at issue between the contracting parties, the decision of the contents of obligation has an important meaning. The contents of obligation is decided by the construction of cont-ract. Therefore, the construction of contract has very important meaning for the decision of the contents of obligation. And the Civil Law of Korea includes provisions to settle disputes related to contract, and most of these provisions have the nature of voluntary law. And when there is no intention of the contracting parties, or it is not clear, the voluntary law comes into application(Civil code art. 105). Ultimately, voluntary law not only becomes the standard of the construction of the contract, but also it is applied as the law to settle dispute. Thus, it needs to clear what is the relation between the construc-tion of contract and the application of law. Therefore, this paper aims to clarify the relationship between the construction of contract and the appli-cation of law.

• International journal of advanced smart convergence
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• 제9권2호
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• pp.157-163
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• 2020

Recently the blockchain technology has been actively studied due to its great potentiality. The smart contract is a key mechanism of the blockchain system. Due to the short history of the smart contract, many issues have not been solved yet. One main issue is vulnerability and another main issue is cost optimization. While the vulnerability of smart contract has been actively studied, the cost optimization has been rarely studied. In this paper, we propose two cost optimization methods for smart contracts running on the blockchain system. Triggering a function in a smart contract program code may require costs and it is repeated continuously. So the minimization of costs required to trigger a function of smart contract while maintaining the performance equally is very important. The proposed two methods minimize the usage of expensive permanent variables deployed on the blockchain system. We apply the proposed two methods to three prevalent blockchain platforms: Ethereum, Klaytn and Tron. Evaluation experiments verify that the proposed scheme significantly reduces the costs of functions in the smart contract written with Solidity.

• 한국무역상무학회:학술대회논문집
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• 한국무역상무학회 2004년도 제32회 산학협동 세미나
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• pp.79-104
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• 2004

The buyer must pay the price under the contract and must take delivery of the goods of contract. The buyer's obligation to pay the price includes taking such steps and such formalities under the contract. The remedial system of the rights of the seller is easier than that of the buyer, for the obligations of the former are less complicated. The seller has the right to avoid a contract provided two conditions are fulfilled : (a) the buyer must have committed a fundamental breach of contract, or (b) the additional period for performance set by the seller in the case of non-performance must have expired. A decision is more difficult to take in the case of a delay where there is no fixed-term contract, to clarify the situation the seller may set a Nachfrist. It is essential that the contracting parties in Korea should understand the provisions of CISG.

• Industrial Engineering and Management Systems
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• 제12권2호
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• pp.85-94
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• 2013

This research investigates the supply chain contract between a distributor and a supplier in which the selling period is relatively short in comparison with long production lead time. At the first stage, supplier who is a Stackelberg leader offers the distributor a contract with a set of parameters, and subjected to those parameters, the distributor places the number of initial orders as well as options. In order to purchase the option, the distributor pays non-linear option premium price with respect to the number of purchased options. At the second stage, based on realized demand, the distributor has the right to exercise option as either put or call which is limited up to the number of purchased options. The wholesale price contract is used as a benchmarking contract. This research has confirmed that the supply chain contract with a non-linear option premium price can help to coordinate the supply chain.

• Asia pacific journal of information systems
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• 제31권4호
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• pp.527-542
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• 2021

The government-driven open data policies are on the rise to protect consumers from misunderstandings and monitor the companies. However, in contract-based industries such as insurance, the contract-inherent characteristics make information asymmetry between consumers and companies. Our paper focuses on insurance contracts where the contingency has high uncertainty of occurrence, and the clauses may incur high costs of reading. Given those contracts, we hypothesized that the contract's clear statement decreases customer dissatisfaction and lowers the number of complaints. To empirically support the claim, we collected customers' complaint documents of insurance companies and insurance contracts from 2005 until 2017. Our econometric models showed that clearer statements and words significantly reduce the complaints after controlling for firm-specific heterogeneity and time-specific heterogeneity. We identify that insurance companies' complaint ratio significantly differ depending on the insurance contract, including specific clauses and words.

• 전자공학회논문지A
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• 제31A권1호
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• pp.17-25
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• 1994

We analyze risks andd present the requirements of digital multisignature in electronic contract systems where several persons contract a digital document electronically. We also apply a few digital multisignature schemes that have been developed so far, to the electronic contract system and propose a new digital multisignature scheme based on the Fiat-Shamir scheme. We investigate how these schemes satisfy with the requirements and evaluate their efficiency in terms of processing speed. communication complexity, and message length Owing to the high processing speed and the high degree of satisfaction to the requirements, the proposed scheme is suitable for electronic contract systems.

• 한국IT서비스학회지
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• 제2권2호
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• pp.31-38
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• 2003

The rapid growth of Korean SI (System Integration) industries have established the largest marketplaces in Korea. Due to the characteristics and importance of SI industry, SI contract between developer and outsourcer is very much important. SI contract have the specific legal characters of undertaking, trust, mandate and etc. However, this paper attempts to establish the particular legal system of SI contract.

• 통상정보연구
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• 제18권4호
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• pp.143-164
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• 2016

본고는 계약의 형식요건과 관련한 PICC상의 서면요건, 특정사항에 및 특정형식에 의한 합의를 조건으로 하는 계약의 성립, 일부의 계약조건이 의도적으로 미정인 계약, 통합조항, 특정형식에 의한 변경 등에 관한 법적 기준과 판결례를 통해 법적 시사점과 유의점을 추론한 논문이다. 승낙의 의사표시에 있어 계약교섭단계에서의 합의를 기초로 서면확약조건과 다른 추가 또는 변경사항은 계약의 일부를 구성하며, 서면확약의 수령자가 침묵과 무위에 임한 경우 당초 합의내용을 중대하게 변경하지 않는 한, 이는 승낙으로 취급된다. 다만 수령인이 부당한 지체 없이 그 조건에 반대하지 않아야 한다. 계약교섭 단계에서 일방이 특정사항 또는 형식으로 합의되기까지 계약이 체결되지 아니한다고 선언한 경우 특정사항 또는 특정형식으로 합의가 이루어지지 않는 한 계약은 체결되지 아니한다. 계약당사자가 계약체결의 의도를 가지고 일부 미결정내용을 추후 합의하거나 또는 제3자가 결정하도록 한 경우 이는 계약의 성립에 영향을 미치지 아니한다. 중대하지 않은 사안, 합의내용의 확정성 정도, 미결정내용의 성격상 추후 확정될 수 있는 사항과 연관되어 있다는 사실, 합의사항이 일부 이행과정에 있다는 사실 등이 결정기준으로 기능한다. 또한 서면에 의해 계약을 체결한 당사자는 추후 계약의 수정 또는 종료가 서면 또는 특정형식에 의한다는 사실을 확약할 목적으로 특별조항을 계약내용에 포함할 수 있다.