• Title/Summary/Keyword: reuse system

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Block Replacement Scheme based on Reuse Interval for Hybrid SSD System (Hybrid SSD 시스템을 위한 재사용 간격 기반 블록 교체 기법)

  • Yoo, Sanghyun;Kim, Kyung Tae;Youn, Hee Yong
    • Journal of Internet Computing and Services
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    • v.16 no.5
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    • pp.19-27
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    • 2015
  • Due to the advantages of fast read/write operation and low power consumption, SSD(Solid State Drive) is now widely adopted as storage device of smart phone, laptop computer, server, etc. However, the shortcomings of SSD such as limited number of write operations and asymmetric read/write operation lead to the problem of shortened life span of SSD. Therefore, the block replacement policy of SSD used as cache for HDD is very important. The existing solutions for improving the lifespan of SSD including the LARC scheme typically employ the LRU algorithm to manage the SSD blocks, which may increase the miss rate in SSD due to the replacement of frequently used block instead of rarely used block. In this paper we propose a novel block replacement scheme which considers the block reuse interval to effectively handle various data read/write patterns. The proposed scheme replaces the block in SSD based on the recency decided by reuse interval and age along with hit ratio. Computer simulation using workload trace files reveals that the proposed scheme consistently improves the performance and lifespan of SSD by increasing the hit ratio and decreasing the number of write operations compared to the existing schemes including LARC.

A Study on the Effect of O2O Service Quality on User Satisfaction and Intention of Reuse (O2O서비스 품질이 사용자만족과 재이용의도에 미치는 영향에 관한연구)

  • Lee, Ok Ju;Yang, Dong Woo
    • Journal of Digital Convergence
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    • v.15 no.6
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    • pp.165-178
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    • 2017
  • O2O platforms are developing in a business area of daily life with evolution of IT technology. The aim of this research is to identify any quality factor of online and offline which affects the satisfaction of O2O service by business characteristic and to varify the relationship between service satisfaction and reuse intention. In this study, information quality, system quality and service quality are defined as factors for online quality and perceived quality and perceived price defined as offline quality. This study was conducted on 199 users who use O2O service. The results showed that online quality system and perceived price of offline quality had a positive effect on user satisfaction and that user satisfaction had a positive effect on Intention to Reuse. These results will provide guidelines for O2O service providers to improve their online services and to select an offline vendor for the O2O platform. It would provide customized O2O service according to personal property of a customer, in case that further research by types of business or service, which are not covered this paper.

Model-Based Quantitative Reengineering for Identifying Components from Object-Oriented Systems (객체지향 시스템으로부터 컴포넌트를 식별하기 위한 모델 기반의 정량적 재공학)

  • Lee, Eun-Joo
    • The KIPS Transactions:PartD
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    • v.14D no.1 s.111
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    • pp.67-82
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    • 2007
  • Due to the classes in object-orientation, which are too detailed and specific, their reusability can be decreased. Components, considered to be more coarse-grained compared to objects, help maintain software complexity effectively and facilitate software reuse. Furthermore, component technology becomes essential by the appearance of the new frameworks, such as MDA, SOA, etc. Consequently, it is necessary to reengineer an existing object-oriented system into a component-based system suitable to those new environments. In this paper, we propose a model-based quantitative reengineering methodology to identify components from object-oriented systems. We expand system model and process, which are defined in our prior work, more formally and precisely. A system model, constructed from object-oriented system, is used to extract and refine components in quantitative ways. We develop a supporting tool and show effectiveness of the methodology through applying it to an existing object-oriented system.

An Efficient Reengineering Process for Legacy System Evolution (레거시 시스템 진화를 위한 효율적 재공학 프로세스)

  • Choi, Il-Woo;Rhew, Sung-Yul
    • The KIPS Transactions:PartD
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    • v.10D no.5
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    • pp.845-858
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    • 2003
  • The various software engineering techniques have been come out in order to cope with the software crisis since 1980's. These days the software Engineering has focused on the process of software development which is the guide for a qualify and productive improvement of software. But, most of the methodologies assume that a new system will be constructed and reused in the future. these do not support how we reuse legacy system's resources and construct a new system efficiently. In this paper, we present an efficient Reengineering Process for legacy system evolutions, RUP+re, which extends and customizes RUP. RUP+re consists of Reverse Engineering Workflow, Transformation Workflow and Evolution Workflow based on Small-h model. We describe RUP+re's workflows with their own detail steps and verify the process through the case study practivally. So, we provide efficient guidelines to the software Reengineering process construction which evolutes the resources of a legacy system.

Development of Water Reusing System by Using Net3FM (Net Fit Fiber Filter Module) (그물망 압착식 섬유여과장치를 이용한 물 재이용 시스템 개발)

  • Kim, Jeongsook;Kim, Mi-Ran;Jo, Myung-Chan;Jang, Jeong-Gook
    • Journal of Environmental Science International
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    • v.21 no.12
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    • pp.1523-1528
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    • 2012
  • This study was carried out to develop pilot plant Net3FM(Net Fit Fiber Filter Module) system and to suggest optimum operating condition for municipal wastewater reuse. SS concentration of biologically treated sewage effluent was reduced from 1.5~5.4mg/L to 0.4~1.0mg/L without coagulant injection in Net3FM system, and the SS removal efficiency was average 84.7%. And also, the removal efficiencies of COD and T-P were decreased slightly due to the SS removal by filtration. Coagulation-Filtration test was conducted to enhance the removal efficiencies of SS and T-P. The optimum dosage of coagulant was injected automatically by auto-controlling system, which is controlled by detecting value of turbidity of secondary sewage effluent. SS, COD and T-P concentrations in filtrated effluent were 0.21~0.57, 1.6~6.2 and 0.137~0.392mg/L with coagulant injection by in-line mixer in Net3FM system, respectively. The removal efficiencies of SS and T-P were highly increased to 92.8% and 89.8%, respectively. It was due to the combined the processes of coagulation and filtration. Net3FM system was evaluated that the removal efficiency of pollutants in secondary sewage effluent and the utilization potential as reclaimed water technology were very high.

Web-Based 3D Model Management System for Virtual Training Contents Production (가상훈련 컨텐츠 제작을 위한 웹 기반 3D 모델 관리 시스템)

  • Kim, Yeon-U;Yoon, Ji-Yean;Kang, Hyeong-Ju
    • The Journal of Korean Institute for Practical Engineering Education
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    • v.4 no.1
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    • pp.72-79
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    • 2012
  • Recently, the growth of the computer-related industries lead to the growth of the computer-aided education. Virtual training (VT) is one of the most interesting education methods. Many 3D models for the VT contents have been produced, but little research has been performed for the unified management system to promote the reuse of 3D models. This paper proposes the unified 3D model management system. The 3D model file formats are surveyed to find a format that can be easily used by many VT content production softwares. The 3D model files will be stored in a central DB server. The structure of the DB system will be designed for 3D models. The system provides an easy way to search and download a 3D model. With the proposed system, the reuse of 3D models is expected to be promoted.

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A New Offline Check System with Spendable Refunds (남은 금액을 재사용할 수 있는 오프라인 전자수표시스템)

  • 김상진;오희국
    • Journal of the Korea Institute of Information Security & Cryptology
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    • v.11 no.6
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    • pp.27-40
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    • 2001
  • In an offline system, the bank does not participate in payments. As a result, it is difficult to make the refund spendable. Due to this, current offline systems do not provide spendable refunds. In these systems, a check consists of two parts: a spendable part and a refund part. A client uses the spendable part during the payment phase, and uses the refund part to get the refund for the remainder of the check. Therefore, a client cannot reuse the remaining and must always refund it. Moreover, the relationship between the spent amount and the refund amount can be used to guess which check the client used when the client refunds the remaining. To remedy these problems, we propose a new offline system which allow clients to reuse the remaining values of the check. This system provides unlinkability of the payments made by using a single check. It also provides mechanisms to detect and identify clients who perform misconduct such as double spending and over spending. The required overall computational cost to withdraw, spend and refund a check in our system is lower than using several checks in other offline systems.

Rearing Olive Flounder Paralichthys olivaceus in a Water Reuse System with Mineral Particles and foam Fractionator (광물미립자와 포말분리장치를 이용한 사육수 재사용시스템에서의 넙치(Paralichthys olivaceus) 사육실험)

  • 민병서;강필애
    • Journal of Aquaculture
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    • v.13 no.3
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    • pp.223-230
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    • 2000
  • A rearing experiment of the olive flounder was performed in a set of water-reuse system to test the reusability of the water in culture system with (i) a foam fractionator to separate particles from water and (ii) a culture tank contain mineral particles to filter the metabolic wastes by adsorption and/or decomposition. Two kinds of commercially processed loess particles and a dolomite particle (all 50 ${\mu}$diameter) were tested. The mineral particles were suspended in the culture tank and the water was pumped into the foam fractionator, where the particles were separated and drained out with foam from the system. In a circular culture tank of 4.8 m in diameter with 10 d water, the juvenile olive flounders (23.1 g/fish, 5,555 fish, 128 kg total body weight) were stocked. 90 % of the rearing water was reused and turnover rate of the water in the tank was two times per hour. Water temperature was maintained 17${\pm}$1$^{\circ}C$. At the end of 75 day-experimental rearing, 5,532 flounders, weighing 468 kg, were harvested. An individual flounder grew to 84.6 g of body weight. The final stocking density was 26.0 kg/$m^2$. No diseases were observed during the experiment.

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A Study on Permeability and Air-void System of Recycled Aggregate Concrete (재생골재를 사용한 콘크리트의 수밀성과 기포조직에 관한 연구)

  • 신윤섭;민찬식;최세규
    • Proceedings of the Korea Concrete Institute Conference
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    • 2001.11a
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    • pp.439-444
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    • 2001
  • In many countries a considerable amount of demolition wastes is generated and wastes concrete constitutes a significant proportion of the construction waste. Therefore, the necessity for the use of recycled aggregate in concrete arise and the reuse of a waste concrete may solve the problems of environmental pollution and shortage of natural aggregate. The Purpose of the present study is to investigate the effects of the recycled aggregate on the compressive strength, the permeability and the air-void system.

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Storing and Querying of Design Knowledge Using Ontology Repository (온톨로지 저장소를 이용한 설계 지식의 저장과 회수)

  • Jee Kyeng-Whan;Yang Jung-Jin
    • Proceedings of the Korean Society of Precision Engineering Conference
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    • 2006.05a
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    • pp.337-338
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    • 2006
  • The requirement to reuse a design knowledge have been enlarged with the automation of a design system. A design knowledge gives logical and technical meanings to design data of a problem area. The representation of the knowledge is distributed and developed independently. For this reason, we need a general methodology with a semantic interoperability of design knowledge. In this paper, we accept previous requirements by using semantic query system with ontology repository.

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