• 한국인터넷방송통신학회논문지
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• 제19권3호
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• pp.97-103
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• 2019

ICT 기술의 발달에 따라서 계약관리 과정을 어플리케이션 기반으로 통합하여 관리하는 방식의 전자계약 시스템이 널리 보급되어 있으며, 최근에는 블록체인 기술을 활용한 개선방법들이 연구되고 있다. 그러나 계약관리 시스템에는 처리성능, 보안 취약성, 데이터 오 입력, 서비스 접근성 문제를 가지고 있다. 본 논문에서는 블록체인, 스마트 컨트렉트, Rest API의 구성을 가지는 블록체인 기반 계약관리 플랫폼을 제안하였다. 제안되는 플랫폼에는 기존의 합의인증 알고리즘의 처리 성능과 보안 취약성 문제를 해결한 RPBFT 알고리즘과 참여자의 데이터 오 입력 방지와 투명성을 강화하기 위한 알고리즘을 프로세스를 함께 제시하였다. 본 논문에서 제안한 블록체인 기반 계약관리 플랫폼은 개선된 처리 성능과 보안성, 신뢰성, 투명성을 가진 사용환경을 제공하고, 구축에 대한 부담 없이 API를 통해 사용이 가능하므로 비용절감 측면과 기술의 확산 측면에서도 효과를 기대할 수 있다.

• 대한산업공학회지
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• 제30권3호
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• pp.241-249
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• 2004

By committing to a long-term replenishment contract, suppliers can mitigate the pressure to find new customers and afford to charge a discounted price to buyers seeking to lower their purchasing costs. In this paper, we develop an analytical model from buyer's perspective for the contracting process to investigate the buyer-supplier interactions. Based on the developed model, we propose an algorithm to derive optimal strategy for the contract. We consider a system with a single buyer and a supplier in a situation where the buyer's inventory is controlled by (R, S) policy under VMI setting. According to the contract, the supplier should replenish the buyer's inventory up to a fixed level every R times during a specified period. The buyer purchases any deficient amount from a spot market at a higher price. We show by computational experiment that our proposed algorithm finds the global optimum solution.

• 대한산업공학회지
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• 제27권4호
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• pp.345-351
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• 2001

We are concerned with a multiple replenishment contract with a purchase price discount in a supply chain. The chain is composed of one supplier, one buyer and consumers for a product. The replenishment contract is based upon the well-known (s, Q) policy but allows contracting several firmed orders at a time with a price discount. Due to a larger forecast error of the future demand, the buyer should keep a higher level of safety stock to provide the same level of service of the usual (s, Q) policy but can reduce his purchase cost by placing larger quantity. Thus there exists a trade-off between the price discount and inventory holding cost. We present a model for the contract and an algorithm to find the optimum number of the firmed orders. Computer experiments show that the algorithm finds the global optimum solution very fast.

• Journal of Information Technology Applications and Management
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• 제20권4호
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• pp.83-95
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• 2013

This study aims to analyze factors that affect satisfaction of students in employment-contract information technology master programs, and suggest policy implications to improve management of employment-contract master programs. A survey of students supported by Software master program of National IT Industry Promotion Agency (NIPA) and Knowledge Information Security master program of Korea Internet and Security Agency (KISA) indicates that department administration, department vision, scholarship, adviser, and lecturer affect satisfaction of students in employment-contract master programs in listed order.

• Ocean Systems Engineering
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• 제9권1호
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• pp.79-95
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• 2019

The material analysis of an offshore structure is generally conducted in the contract design phase for the price quotation of a new offshore project. This analysis is conducted manually by an engineer, which is time-consuming and can lead to inaccurate results, because the data size from previous projects is too large, and there are so many materials to consider. In this study, the piping materials in an offshore structure are analyzed for contract design using a big data framework. The big data technologies used include HDFS (Hadoop Distributed File System) for data saving, Hive and HBase for the database to handle the saved data, Spark and Kylin for data processing, and Zeppelin for user interface and visualization. The analyzed results show that the proposed big data framework can reduce the efforts put toward contract design in the estimation of the piping material cost.

• Journal of Construction Engineering and Project Management
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• 제5권3호
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• pp.18-28
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• 2015

Bidding and contract systems are used for public construction projects to select contractors following fair competition principles and to execute national budgets effectively. Many challenges have arisen due to a lack of transparency and fairness and because bidding practices have been luck-based. Few comprehensive or comparative analyses have been conducted on the performance and limitations of bidding and contract systems, and empirical analyses designed to improve policies on and the practice of such systems are lacking. This study empirically analyzed current bidding and contract systems to seek ways of improving them. The study proposes several alternatives to resolve the problems with and irrationalities of the current system: 1) improving bidding and selection systems by changing them from a luck-based price competition into a technical merit- and value-based competition; 2) improving the assessment criteria to meet the current market level of bid and winning prices; 3) adjusting contractual responsibilities and sharing structures to meet the current trend; and 4) strengthening the competitiveness and expanding the social responsibility-based procurement systems of construction companies.

• 유통과학연구
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• 제12권9호
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• pp.15-23
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• 2014

Purpose - The purpose of this study is to investigate the effects of service marketing agents' psychological contract with the company on organizational commitment and organizational citizenship behavior. Research Design, Data, and Methodology - The antecedent variable of psychological contract, dependent variables of organizational commitment and citizenship behavior, and mediating variables of self-esteem, self-efficacy, and perceived organization support were used, based on precedent studies. Result - The psychological contract had a positive influence on self-esteem, self-efficacy, and organizational support. Moreover, self-efficacy and organizational support had an influence on commitment, while self-esteem, self-efficacy, and organizational support influenced organizational citizenship behavior. In addition, the results relating to mediated effects showed that only self-esteem had no mediated effect between contract and commitment. Conclusions - The call centers are asked to let the agents cognize an affirmative psychological contract. Further, the call centers are asked to produce an organizational atmosphere to let agents increase motivation factors. Finally, agents should develop them at personal levels to cognize organizational support affirmatively and to keep mutually beneficial contracts between call centers and agents.

• 아태비즈니스연구
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• 제11권4호
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• pp.149-165
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• 2020

Purpose - This study investigates how employee personality traits affect psychological contract breach. Also, our study examines how Guanxi, a unique socio-cultural characteristic of China, moderates the relationship between personality traits and psychological contract breach. Design/methodology/approach - To test our ideas, we constructed a survey questionnaire based on the literatures on personality traits, Guanxi, and psychological breach. The questionnaires were distributed to Chinese employees, and then we conducted a regression analysis using 378 questionnaires. Findings - We found that neuroticism is positively related to perceived psychological contract breach. We also identified support for the prediction that the positive link between neuroticism and psychological contract breach becomes weaker when employees' awareness of Guanxi is high. Research implications or Originality - This study provides several theoretical and practical implications. First, this study elaborates the personality traits-psychological contract breach relationship by incorporating Guanxi, a critical contingency factor of China. Second, given that the relationship between neuroticism and psychological contract breach can be affected by employees' perceptions of Guanxi, managers should administer Guanxi to function as a lubricant within the organization.

• 한국수학교육학회지시리즈B:순수및응용수학
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• 제21권1호
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• pp.77-93
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• 2014

This paper focuses on computational contractual distinctions as an explanation for the spread between a forward contract and a similar futures contract which is derived and investigated. We evaluate this spread by constructing a time series model, which was established based on copula functions, and also show that the forward-futures spread is more significant for long maturity.

• Journal of Electrical Engineering and Technology
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• 제6권1호
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• pp.139-146
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• 2011

This paper presents a new modified Contract Net Protocol (CNP) for microgrid operation based on multiagent system. The CNP is a widely used protocol for interactions among distributed problem solving. The Contract Net Interaction Protocol of the Foundation for Intelligent Physical Agents (FIPA-CNIP) is a minor modification of the original CNP for multiagent system applications. In this paper, a modified CNP (MCNP) based on the FIPA-CNIP is proposed for more specialized interactions among agents for microgrid operation. A multiagent system is designed and constructed for microgrid operation. A microgrid operation based on the multiagent system is tested to check the functionality of the proposed MCNP.