• 산업경영시스템학회지
• /
• 제38권1호
• /
• pp.110-117
• /
• 2015

Spare part management is very important to products that have large number of parts and long lifecycle such as automobile and aircraft. Supply chain must support immediate procurement for repair. However, it is not easy to handle spare parts efficiently due to huge stock keeping units. Qualified forecasting is the basis for the supply chain to achieve the goal. In this paper, we propose an agent based modeling approach that can deal with various factors simultaneously without mathematical modeling. Simulation results show that the proposed method is reasonable to describe demand generation process, and consequently, to forecast demand of spare parts in long-term perspective.

• Smart Structures and Systems
• /
• 제20권6호
• /
• pp.697-708
• /
• 2017

Maintenance plays a critical role in the bridge industry, but actual practices show many limitations because of traditional, 2D-based information systems. It is necessary to develop a new generation of maintenance information management systems for more reliable decision making in bridge maintenance. Enhancing current work processes requires a BIM-based 3D digital model that can use information from the whole lifecycle of a project (design, construction, operation, and maintenance) through continuous exchanges and updates from each stakeholder. This study describes the development of a data scheme for maintenance of cable-stayed bridges. We implemented the proposed system for a cable-stayed bridge and discussed its effectiveness.

• Industrial Engineering and Management Systems
• /
• 제7권1호
• /
• pp.51-56
• /
• 2008

With growing demand for zero defects, predicting reliability of software systems is gaining importance. Software reliability models are used to estimate the reliability or the number of latent defects in a software product. Most reliability models to estimate the reliability of software in the literature are based on the development lifecycle stages. However, in the maintenance phase, the software needs to be corrected for errors and to be enhanced for the requests from users. These decrease the reliability of software. Software Reliability Growth Models (SRGMs) have been applied successfully to model software reliability in development phase. The software reliability in maintenance phase exhibits many types of systematic or irregular behaviors. These may include cyclic behavior as well as long-term evolutionary trends. The cyclic behavior may involve multiple periodicities and may be asymmetric in nature. In this paper, SGRM has been adapted to develop a reliability prediction model for the software in maintenance phase. The model is established using maintenance data from a commercial shop floor control system. The model is accepted to be used for resource planning and assuring the quality of the maintenance work to the user.

• Wind and Structures
• /
• 제28권5호
• /
• pp.271-284
• /
• 2019

This paper describes the application of a novel virtual prototyping methodology to wind turbine blade design. Numeric modelling data and experimental data about turbine blade geometry and structural/dynamical behaviour are combined to obtain an affordable digital twin model useful in reducing the undesirable uncertainties during the entire turbine lifecycle. Moreover, this model can be used to track and predict blade structural changes, due for example to structural damage, and to assess its remaining life. A new interactive and recursive process is proposed. It includes CAD geometry generation and finite element analyses, combined with experimental data gathered from the structural testing of a new generation wind turbine blade. The goal of the research is to show how the unique features of a complex wind turbine blade are considered in the virtual model updating process, fully exploiting the computational capabilities available to the designer in modern engineering. A composite Sandia National Laboratories Blade System Design Study (BSDS) turbine blade is used to exemplify the proposed process. Static, modal and fatigue experimental testing are conducted at Clarkson University Blade Test Facility. A digital model was created and updated to conform to all the information available from experimental testing. When an updated virtual digital model is available the performance of the blade during operation can be assessed with higher confidence.

• 기록학연구
• /
• 제4호
• /
• pp.31-62
• /
• 2001

In this paper, I examined specific characteristics of the Tables of Transactions for Records Scheduling(TRS) (記錄物分類基準表 ; Kirokmul-Bulyukijun - Pyo) system by Public Records and Archives Act(PRA Act, No. 5709, 1999). All staffs and employees in governmental agencies of Korea must register, classify and dispose of their official records according to TRS by the Presidential Regulation for the application of PRA Act(No. 17050, 2000). Namely, the criteria of TRS is applicable to all stages of records lifecycle from creation to disposition(transfer to Archives or legal destruction). In the theoretical and methodological area, therefore, it is absolutely important that records managers and archival professionals in Korea make analysis on functions and characteristics of TRS by PRA Act. In the first, my examination take notice of possibility of 'adequate and proper documentation' about activity of the executive organization in TRS system. Other attention is that records management according to TRS means managing of records not only as physical entities but as logical entities which imply content and context of creation and use. In other hand, I wish to account for reasonable separation consideration for continuing utility of archives from current use of records throughout agencies duration Another theme of discussion in this paper is the theoretical framework which give account of TRS's characters. In conclusion, accountability for characteristics of TRS system could have been found in counterproposal view including the concept of Records continuum and the notion of Recordkeeping regime in Australia based on rethinking about Records lifecycle model. In the extent of practical area, more or less, it is imbalanced method that compare TRS by PRA Act to Recordkeeping regime based on Records continuum. Nevertheless, the concept and notion is suitable framework that give account of the prospect of recordkeeping system under PRA Act.as well as the meaningful characteristic of TRS.

• 한국정보시스템학회지:정보시스템연구
• /
• 제31권1호
• /
• pp.239-269
• /
• 2022

Purpose This paper attempts to identify items for improving the usage of PLM(Product Lifecycle Management) systems and suggests ways to prioritize improvement items on the basis of importance. It also tries to find out differences in the importance of improvement items due to the company size, the industry, the job, or the PLM solution. Design/methodology/approach Through a survey from participants to a PLM System Conference, data were collected from a sample of 181 users who had the previous experience in using a PLM system. In order to figure out the differences in the importance among user groups, the F-test with the Scheffe test as a post-hoc analysis was used in case of equal variances and the Welch test with the Dunnett T3 test was used in case of unequal variances. Findings This study sorted out 25 improvement ideas according to their importance assessed by the PLM system users. The top five ideas are improving data consistency, error minimization, fast system response time, enhancing user recognition, and business process improvement. The support group puts higher importance than the general user group in data consistency, fast system response time, enhancing user recognition, business process improvement, dedicated team for data consistency, continuous support from management, hardware performance upgrade, output linkage to other systems, and shortening problem solving duration. The largest company group attaches significantly higher weights than the smallest company group to data consistency, error minimization, fast system response time, business process improvement, dedicated team for data consistency, security with proper access management, output linkage to other systems, and better user interface.

• 디자인융복합연구
• /
• 제15권6호
• /
• pp.255-270
• /
• 2016

본 연구는 중소 제조기업에서 실무 활용에 괴리가 있었던 UX 디자인 프로세스의 이론적 지식을 실제 제조 프로세스의 최적화 모델에 매핑하기 위해 체계화된 UX 방법론을 선택하여 도입하는 것을 목적으로 한다. 국내·외 학계의 이론을 바탕으로 대표적인 UX 디자인 프로세스 7개 모델을 속성과 단계별 결과물에 따라 분석하였다. 이후 국내 18개 기업과의 인터뷰, 관찰을 통해 현장에서 실제로 수행 중인 실무 프로세스를 분석하고 이론과 실무의 동질성, 차이점, 방법론을 비교하였다. 이를 기반으로 이론-실무 통합 방법론 100개를 도출하여 PLUS 프로세스 6단계에 따라 최적화된 UX 방법론 유형을 분류하였다. 이후 기업별 인터뷰를 통해 각 방법론을 적용했을때 자사 프로세스와의 일치성, 자사 리소스의 한계, 특성 등을 파악하고 분석하여 국내 기업의 니즈를 반영하고자 하였다. 본 연구의 결과는 중소 제조기업을 대상으로 UX 방법론의 표준 플랫폼을 제안하여 UX 디자인 프로세스의 상용화를 목표로 하는 기초연구로써 국내 기업의 경쟁력 향상에 기여할 수 있을 것이다.

• 한국컴퓨터정보학회논문지
• /
• 제10권3호
• /
• pp.275-286
• /
• 2005

IT(Information Technology)가 비즈니스 업무에 도입 구축된 이래, 기업의 비즈니스 모델에 대한 관심사는 지속적으로 커지고 있다. 기업은 수익을 창출할 것으로 예상되는 비즈니스 모델을 만들기 위한 노력을 경주하고 있으나 그 비즈니스 모델이 성공을 한다고 보장할 수는 없다. 신 기술의 라이프사이클이 짧아지는 상황에서, 당시에 출현한 기술의 우수성 판단만으로는 그 기술을 기반으로 한 비즈니스 모델이 수익을 창출할 것이라고 보장할 수는 없다. 이에, Timmers 모델, Julta 등의 비즈니스 모델, Rappa 모델, 전자상거래 수익모델, B2E 모델과 제휴, 제휴(Affiliated) B2E 비즈니스 프레임에 대한 모델을 분석한 후, 이들 모델의 장단점을 제시하고자 한다. 또한 기술평가와 비즈니스 모델간 관련성에 대한 분석을 한 후, 모바일 솔루션 기업들이 시장에서 성공하기 위한 Comraded B2E 비즈니스 모델을 도출하고자 한다.

• Structural Engineering and Mechanics
• /
• 제63권6호
• /
• pp.703-712
• /
• 2017

The composite blades of offshore wind turbines accumulate structural damage such as fatigue cracking due to harsh operation environments during their service time, leading to premature structural failures. This paper investigates various fatigue crack models for reproducing crack development in composite blades and proposes a stochastic approach to predict fatigue crack evolution and to analyse failure probability for the composite blades. Three typical fatigue models for the propagation of fatigue cracks, i.e., Miner model, Paris model and Reifsnider model, are discussed to reproduce the fatigue crack evolution in composite blades subjected to cyclical loadings. The lifetime probability of fatigue failure of the composite blades is estimated by stochastic deterioration modelling such as gamma process. Based on time-dependent reliability analysis and lifecycle cost analysis, an optimised maintenance policy is determined to make the optimal decision for the composite blades during the service time. A numerical example is employed to investigate the effectiveness of predicting fatigue crack growth, estimating the probability of fatigue failure and evaluating an optimal maintenance policy. The results from the numerical study show that the stochastic gamma process together with the proper fatigue models can provide a useful tool for remaining useful life predictions and optimum maintenance strategies of the composite blades of offshore wind turbines.

• 한국지하수토양환경학회지:지하수토양환경
• /
• 제25권2_spc호
• /
• pp.70-85
• /
• 2020

This paper introduces the 'Smart Scoping for Environmental Investigations Technical Guide' issued by the US Environmental Protection Agency in 2018, which describes the use of smart scoping during lifecycle of remedial investigation projects. This paper also briefly summarizes the guidelines of soil and groundwater contamination investigation of South Korea. The smart scoping practices can support the development of a robust and realistic conceptual site model that is very useful for investigations and evaluations of the contaminated site. The application of evaluation tools relevant for the site-specific characteristics is important for the development of a conceptual site model. The smart scoping recommends the use of previous investigation data and implementation of best proven strategies for successful remedial investigation project. The use of smart scoping in contaminated site investigation will provide better management of contaminated sites.