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유정석 한국유통과학회 2014 유통과학연구 Vol.12 No.3
Purpose - This study primarily aims to represent the current trend of research on CPFR as a promising supply chain collaboration program and proposes a new framework for analyzing any collaboration programs in terms of three key collaborative features. Research design, data, and methodology - This study employs a literature review of selected studies that conduct research on CPFR. CPFR is analyzed based on the proposed framework that characterizes collaboration programs in terms of three key collaborative features. Results - The analysis based on the proposed framework reveals that the current form of CPFR continues to have some collaborative features that are not fully utilized to create an advanced collaboration program. The literature review indicates that most past studies ignore critical issues including the dynamic nature of the multiple-stage supply chain system and negotiation process for collaborative agreement in CPFR implementation. Conclusions - Results indicate that CPFR can become a better supply chain collaboration program by incorporating coordinative cost payment and joint decision making processes. Based on observations on the existing literature of CPFR, this study indicates several important issues to be addressed by future studies.
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Investigation on How VMI affects Ongoing Performance of Supply Chain System
유정석 한국유통과학회 2020 유통과학연구 Vol.18 No.1
Purpose: This study investigates the influence of VMI on the supply chain performance over time. By examining each supply chain member’s ongoing performance, this study figures out how VMI allows the vendor to overcome the initial loss and eventually provides the benefit to every supply chain member. Research design, data, and methodology: The proposed mathematical model describes the supply chain system where a manufacturer and a retailer make the operational decisions to maximize their own profits. By using the numerical examples with arbitrary data, VMI and non-VMI are compared in terms of their profit changes over time. Results: The numerical analysis shows that VMI results in greater overall profits for both manufacturer and retailer than non-VMI, while the manufacturer make a loss in the early stage of VMI implementation. This study also examines the impacts of certain conditional factors on the performance of VMI. Conclusions: This study supports the idea that VMI leads to manufacturer’s initial loss but it brings greater profits to both manufacturer and retailer than non-VMI after all. In addition, the result of this study provides the managerial implications about the particular condition that allows VMI to achieve a significant financial performance improvement over non-VMI.
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qtar: 플래시 변환 계층 리매핑 기법을 이용한 최적화된 tar 명령어 구현
유정석,한상욱,김지홍 한국정보과학회 2018 정보과학회논문지 Vol.45 No.1
Tar is a Linux command that combines several files into a single file. Combining multiple small files into large files increases the compression efficiency and data transfer speed. However, tar has a problem in that smaller target files, result in a lower performance. In this paper, we show that this performance degradation occurs when tar reads the data from the target files and propose qtar (quick tar) to solve this problem via flash-level remapping. When the size of an I/O request is less than 1 MB, the I/O performance decreases proportionally to the decrease in size of the I/O request. Since tar reads the data of files one by one, a smaller file size results in a lower performance. Therefore, the remapping technique is implemented in qtar to read data from the target files at the maximum I/O size regardless of the size of each file. Our evaluations show that the execution time with qtar is reduced by up to 3.4 times compared to that with tar. tar는 여러 개의 파일들을 묶어 하나의 파일로 만들어주는 리눅스 명령어이다. 크기가 작은 여러 파일들을 하나의 파일로 만들면, 파일 압축 및 전송 시에 좋은 효율을 갖는다. 하지만, tar는 타겟 파일들의 크기가 작을수록 성능이 떨어지는 문제점이 있다. 본 논문에서는 이 성능 하락이 tar가 파일들의 데이터를 읽어오는 데에서 발생함을 보이고, 플래시 변환 계층 리매핑 기법을 통해 이 문제를 해결하여 qtar (quick tar)를 구현하였다. I/O 성능은 I/O 요청의 크기가 1 MB보다 작아질 경우 그 크기에 비례하여 떨어지게 되는데, tar의 경우 파일들의 데이터를 한 파일 단위로 읽어 각 파일의 크기가 작을수록 안 좋은 성능을 갖게 된다. 그러나, qtar의 경우 리매핑 기법을 활용하여 파일들의 데이터를 항상 최대 I/O 크기로읽어 각 파일의 크기와 관계없이 좋은 성능을 갖는다. 실험 결과, qtar가 tar에 비해 최대 3.4배 빠르게 동작하는 것을 확인하였다.
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How VMI and Consignment Jointly Affect Supply Chain Performance
유정석 한국유통과학회 2015 유통과학연구 Vol.13 No.3
Purpose – Due to its potential to improve supply chain operations, supply chain collaboration has attracted significant attention from both academics and practitioners. This study focuses on VMI, in collaboration with consignment, and examines its impact on supply chain performance. Research design, data, and methodology – This study employs the analysis of mathematical models, formulated based on the proposed supply chain framework. Using numerical examples, it evaluates the performance of three supply chain systems: one including VMI and consignment, a consignment-only system, and a traditional system. Results – The combination of VMI and consignment produces greater supply chain benefits than the consignment-only and traditional systems. Whereas only the performance of the buyer improves with the consignment-only system, the system with VMI and consignment is beneficial to both the buyer and supplier. Conclusions – The results of this study reveal that the inclusion of the additional collaborative function of VMI makes consignment a better supply chain collaboration program. Future studies should examine issues regarding the testing of diverse collaboration programs and the building of a firm theoretical background.
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