• Title/Summary/Keyword: Basic warranty

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Optimal Warranty Policy for Free Two-phase Warranty (무료 이단계 보증에 대한 최적의 보증 정책)

  • Ki Mun Jung
    • Journal of Integrative Natural Science
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    • v.17 no.2
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    • pp.43-51
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    • 2024
  • Jung et al.(2015) suggest the two-phase warranty model, which is a general type of warranty model. Under the two-phase warranty, the warranty period is divided into two intervals, one of which is for renewing replacement warranty, and the other is for minimal repair warranty. And warranty policies play a very important role in product marketing. In this paper, we suggest the optimal warranty policy for free extended two-phase warranty. To determine the optimal warranty period, we adopt the expected profit per unit product. So, the expressions for the total expected cost, the sale price and the expected profit per unit product from the manufacturer's point of view are derived. Also, we discuss the optimal warranty period and the numerical examples are provided to illustrate the proposed the warranty policy.

Two stage maintenance policy under non-renewing warranty (비재생보증 하에서의 이단계 보전정책)

  • Jung, Ki Mun
    • Journal of the Korean Data and Information Science Society
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    • v.27 no.6
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    • pp.1557-1564
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    • 2016
  • Recently, an extended warranty of a system following the expiration of the basic warranty is becoming increasingly popular to the user. In this respect, we suggest a two stage maintenance policy under the non-renewing warranty from the user's point of view in this paper. In the first stage, the user has to decide whether or not to purchase the extended warranty period. And, in the second stage, the optimal replacement period following the expiration of the warranty is determined. Under the extended warranty, the failed system is minimally repaired by the manufacturer at no cost to the user. We utilize the expected cost from the user's perspective to determine the optimal two stage maintenance policy. Finally, a few numerical examples are given for illustrative purpose.

Preventive maintenance model with extended warranty (연장된 보증을 갖는 예방보전모형)

  • Jung, Ki Mun
    • Journal of the Korean Data and Information Science Society
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    • v.24 no.4
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    • pp.773-781
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    • 2013
  • Recently, an extended warranty of the system following the expiration of the basic warranty is becoming increasingly popular to the user. In this respect, we suggest a preventive maintenance model following the expiration of extended warranty with minimal repair warranty from the user's point of view in this paper. Under basic warranty and extended warranty, the failed system is minimally repaired by the manufacturer at no cost to the user. For the preventive maintenance model, we derive the expressions for the expected cycle length, the expected total cost and the expected cost rate per unit time. Also, we determine the optimal preventive maintenance period and the optimal preventive maintenance number by minimizing the expected cost rate per unit time. Finally, the numerical examples are presented to illustrate the purpose when the failure time of the system has a Weibull distribution.

Optimal replacement policy after extended warranty for a system with minimal repair warranty (최소수리 보증을 갖는 시스템에 대한 연장된 보증 이후의 최적의 교체정책)

  • Jung, Ki Mun
    • Journal of Applied Reliability
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    • v.13 no.2
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    • pp.77-86
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    • 2013
  • Recently, an extended warranty of a system following the expiration of the basic warranty is becoming increasingly popular to the user. In this respect, we suggest a replacement model following the expiration of extended warranty with minimal repair warranty from the user's point of view in this paper. Under extended warranty, the failed system is minimally repaired by the manufacturer at no cost to the user during the original extended warranty period. As a criterion of the optimality, we utilize the expected cost rate per unit time during the life cycle from the user's perspective and suggest the optimal replacement period after extended warranty. Finally, a few numerical examples are given for illustrative purpose.

Replacement Model after Extended Two-phase Warranty (연장된 이단계 보증 이후의 교체모형)

  • Jung, Ki Mun
    • Journal of Integrative Natural Science
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    • v.14 no.4
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    • pp.197-204
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    • 2021
  • Under the two-phase warranty, the warranty period is divided into two intervals, one of which is for renewing replacement warranty, and the other is for minimal repair warranty. Jung[13] discusses the two types of extended two-phase warranty models. In this paper, we suggest the replacement model after the extended two-phase warranty that has been proposed by Jung[13]. To determine the optimal replacement policy, we adopt the expected cost rate per unit time. So, the expressions for the total expected cost, the expected length of the cycle and the expected cost rate per unit time from the user's point of view are derived. Also, we discuss the optimal replacement policy and the uniqueness of the solution for the optimization. Furthermore, the numerical examples are provided to illustrate the proposed the replacement model.

A Basic Study on the Methodology to Introduce Warranty Contracting for Pavements in Korea (도로포장 성능보증(Warranty) 계약제도 도입방안에 관한 기초연구)

  • Kim, Tae-Song;Seo, Yong-Chil;Lee, Sang-Beom;Koo, Jai-Dong
    • Korean Journal of Construction Engineering and Management
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    • v.9 no.4
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    • pp.66-74
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    • 2008
  • Warranty contracting for pavements construction has been widely used in Europeans countries, Japan, and the U.S. and the benefits of warranty contract has been proven. This research investigated the European, U.S., and Japanese warranty contract policies and compared pros and cons. The most appropriate warranty contract policy solution is developed to fit in the Korean construction industry culture. Three main conclusions have been developed in this study: (1) performance specifications should be developed; (2) the systematic method is required to estimate the appropriate costs of performance bond and warranty period, etc.; and (3) short and long term plans for adopting performance warranty contract in Korea are suggested.

Legal Direction of Defect Warranty Liability in the Korean Construction Industry

  • Cho, Young-Jun
    • Journal of the Korea Institute of Building Construction
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    • v.18 no.2
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    • pp.195-202
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    • 2018
  • The defects that are bound to arise in most construction projects cause disputes among the contracting parties regarding the defect warranty liability (DWL)guaranteed by the retention of the contractor's performance security at the end of the performance period of the contract. Most current projects involve a multiple-tier contractual relationship, causing the liability for some defects to overlap. In addition, many construction projects are made up of multiple detailed work types which an expert hired by the owner inspects the part completed by the contractor and pays an interim payment. However, after the completion of work, the contractor will still hold the defect warranty liability. In a scenario in which the work is delayed due to reasons for which the owner is responsible, the defect warranty liability period is also increased, imposing an additional burden on the contractor. In this study, basic research was carried out with the goal of reducing problems related to defect warranty liability Problems related to defect warranty liability cases and the nature of the defect warranty liability period were investigated. Possible solutions to the problems caused by the DWL that were suggested include the separation of the negligence liability period and the strict liability period, as well as the introduction of a retention money system.

Optimal replacement policy following the expiration of payable RRNMW (유료 재생교체-비재생수리보증이 종료된 이후의 최적의 교체정책)

  • Jung, Ki-Mun
    • Journal of Applied Reliability
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    • v.11 no.4
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    • pp.409-417
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    • 2011
  • In this paper, we consider a replacement model following the expiration of warranty. In other words, this paper proposes the optimal replacement policy for a repairable system following the expiration of payable renewing replacement-non-renewing minimal repair warranty. The expected cost rate per unit time from the user's perspective is used to determine the optimality of the replacement policy. Thus, we derive the expressions for the expected cycle length and the expected total cost to obtain the expected cost rate per unit time. Finally, the numerical examples are presented for illustrative purpose.

Comparative Review on Term of Warranty Liability of Reinforced Concrete Work through Occurred Defect Data Analysis in Apartment Building (공동주택 하자실적자료 분석을 통한 철근콘크리트 공사의 하자담보책임기간 비교연구)

  • Seo, Deok-Seok;Park, Jun-Mo
    • Proceedings of the Korean Institute of Building Construction Conference
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    • 2017.05a
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    • pp.266-267
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    • 2017
  • As apartment buildings defect lawsuits become socioeconomic problems, an objective basis system for the term of warranty liability of reinforced concrete constructions is urgent. This study was carried out as a basic study for developing a basis system for the term of warranty liability. To do this, defect data actual collected in apartment complexes were collected and analyzed. As the result of checking the cumulative rate of defect occurrence in reinforced concrete construction by year, the point of time of reaching the 90% level was the 5th years, which was similar with the provision of the Apartment Building Management Act. However, the current Supreme Court precedent has decided that the term of warranty liability for the main structural parts in reinforced concrete construction shall be 10 years and the dispute is expected to continue in the future in the defect lawsuit.

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Basic Research on Evaluation of Defect Repair Period of Finishing Works in Apartment Houses according to Performance Data (실적자료에 의한 공동주택 마감공사의 하자보수기간의 적절성 평가 기초연구)

  • Kim, Dae-gil;Lee, Ung-Kyun;Seo, Deok-Seok
    • Proceedings of the Korean Institute of Building Construction Conference
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    • 2015.05a
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    • pp.245-246
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    • 2015
  • Cases of lawsuit and conflict are increasing because of defects in apartments in use after the completion of construction. Further, with changes in the consciousness of residents and in the social environment, many residents are showing interest in defect-related lawsuits. However, the term of warranty liability defined in the current law is not practically appropriate, and the verification of the determination of the term of warranty liability is insufficient. Against this background, this research aims to evaluate the appropriateness of defect repair periods by examining the actual defect condition of the finishing work among the various defects related to apartments. Collected performance data are analyzed by statistical techniques by considering the defect occurrence rate per construction type and the construction year of the finishing work in apartment construction. The analysis results will be used as basic data for evaluating the appropriateness of the standards for the term finishing works warranty liability.

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