• Journal of KIISE:Computer Systems and Theory
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• v.35 no.1
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• pp.18-29
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• 2008

NAND Flash memory has been growing popular storage device for the last years because of its low power consumption, fast access speed, shock resistance and light weight properties. However, it has the distinct characteristics such as erase-before-write architecture, asymmetric read/write/erase speed, and the limitation on the number of erasure per block. Due to these limitations, various Flash Translation Layers (FTLs) have been proposed to effectively use NAND flash memory. The systems that adopted the conventional FTL may result in severe performance degradation by the hot data which are frequently requested data for overwrite in the same logical address. In this paper, we propose a novel FTL algorithm called Adaptive Flash Translation Layer (AFTL) which uses sector mapping method for hot data and log-based block mapping method for cold data. Our system removes the redundant write operations and the erase operations by the separating hot data from cold data. Moreover, the read performance is enhanced according to sector translation that tends to use a few read operations. A series of experiments was organized to inspect the performance of the proposed method, and they show very impressive results.

• Korean Journal of Social Welfare
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• v.62 no.1
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• pp.291-316
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• 2010

This study aimed to look for the possibility of dissolving social exclusion about the social vulnerable classes through the culture welfare programs. For this purpose, we analyzed interview records focused on the culture welfare practitioners applying the Modified Grounded Theory Approach worked out by Kinosita. The results showed that the culture welfare programs functionated of dissolving social exclusion about the social weaks by enhancing latent faculties and the sense of self-respect of them through providing various opportunities of culture fruition. It was appeared that the culture welfare programs promoted creative competence and the sense of self-respect, and strengthened the sense of solidarity of the participants by using the approaching strategies of offering various opportunities of creational experience, atypical operating programs centered on the process, establishing of the participants' subjecthood, and communal activities. That is, it was proved that actually the social weaks experienced the change of life with feeling emotional satisfaction, promoting family and human relationship, establishing positive identity, empowerment, participating communal activities, and so on, through the culture welfare programs. From these results we can know that if we provide the programs mixing the culture welfare programs with social welfare services which traditionally reinforced social exclusion about the social vulnerable classes by stigma, the social exclusion about them can be dissolved.

• Journal of Navigation and Port Research
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• v.28 no.1
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• pp.51-58
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• 2004

Due to the changes in market place, new business types(e.g. e-business} have been rapidly emerged and increased. However, those new business types have not much been emerged in port and logistics related industries, and adoption rate of e-business in this area is very low, compared to other industries. Thus, to promote e-business in this area, many policies have been studied. However, most of previous studies have not been based on industrial structure, and results of these studies have mostly been case by case. Further, there have been no research based on the related theories. As a result, despite many of research and project for shipping and port related e-business, prominent achievements in this area have never to be presented. For these reasons, it am be stated that, first of all, basic studies related to new business types in shipping and port are needed, and then, various policies based on results of those basic studies should be discussed. The aim of this study is to classify business types existed (or expected) in a port related industry, ship bunkering. This taxonomy was based on theories related to business layer(BL) and value chain(VC), and these BL and VC combination enabled to acquire all possible business types.

• The Journal of the Korea Contents Association
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• v.13 no.5
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• pp.71-81
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• 2013

Punch awakens the audience of necessity of social change related to the poverty and prejudice toward the underprivileged. However Bourdieu claims individuals such as Dong-Ju Lee can not change existing dominant order even if they struggle for social change. In particular, laughter effect and romantic gaze as a commercial strategy on Punch become mechanism for maintaining the symbolic violence. And this is soon to be recognized as legitimate victims of violence themselves, as Bourdieu has argued that maintaining social order and reproduction by collusion are possible.

• Journal of KIISE:Computer Systems and Theory
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• v.36 no.2
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• pp.87-93
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• 2009

Intrusion tolerant system enables essential services to maintain for a period of time under system failure, malicious attacks and is gaining more importance in national defense, communication infrastructure, and financial sector. However, few objective evaluation criteria for companies and agencies to introduce an appropriate system are available. This paper proposes a suitability evaluation method, using Analytic hierarchy process and fuzzy integral, for intrusion tolerant system, along with evaluation criteria which considers the characteristics and costs of systems in addition to other factors.

• The KIPS Transactions:PartD
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• v.12D no.2 s.98
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• pp.211-218
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• 2005

This study presents an integrated data mining model for the credit evaluation of the customers of a capital company. Based on customer information and financing processes in capital market, we derived individual models from multi-layered perceptrons(MLP), multivariate discrimination analysis(MDA), and decision tree. Further, the results from the existing models were compared with the results from the integrated model using genetic algorithm. The integrated model presented by this study turned out to be superior to the existing models. This study contributes not only to verifying the existing individual models but also to overcoming the limitations of the existing approaches.

• KSCE Journal of Civil and Environmental Engineering Research
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• v.13 no.2
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• pp.151-160
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• 1993

This paper is concerned with formulations of the hierarchical $C^{\circ}$-plate element on the basis of Reissner-Mindlin plate theory. On reason for the development of the aforementioned element based on Integrals of Legendre shape functions is that it is still difficult to construct elements based on h-version concepts which are accurate and stable against the shear locking effects. An adaptive mesh refinement and selective p-distribution of the polynomial degree using hp-version of the finite element method are proposed to verify the superior convergence and algorithmic efficiency with the help of the simply supported L-shaped plate problems.

• Journal of the Korea Institute of Information and Communication Engineering
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• v.15 no.1
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• pp.1-8
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• 2011

To visualize a strategic plan including resource allocations and standardization schedules, it is important to set priorities among information and communication technologies(ICTs) standardization work areas(SWAs). This ranking process involves decision making process with multiple criteria which results a complex selection problem. In this study, analytic hierarchy process(AHP) is employed and applied to solve this decision making problem. The processes and results are illustrated for an effective strategic plan in standardization decision processes.

• Journal of KIISE:Computer Systems and Theory
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• v.33 no.8
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• pp.505-513
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• 2006

To satisfy SLA(Service Level Agreement) contract between a client and a service provider, the client requests are classified and processed by priorities. In providing differentiated service, a request from a client who has low priority can be dealt with less important. In this paper, we study static and dynamic partitioning mechanism of web servers and also admission control policy for multiclass request distribution. Through simulation experiments, we analyze web server throughput and response time considering SLA.

• Journal of the Korean Institute of Intelligent Systems
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• v.10 no.3
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• pp.232-241
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• 2000

This study suggests an integrated method based on concept hierarchies, information gain, and rough set theory for efficient discovery rules from a large amount of data, and implements an optimal rules discovery system. Our approach applies attribute-oriented concept ascension technique to extract generalized knowledge from a database, knowledge reduction technique to remove superfluous attributes and attribute values, and significance of attributes to induce optimal rules. The system first reduces the size of database by removing the duplicate tuples through the condition attributes which have no influences on the decision attributes, and finally induces simplified optimal rules by removing the superfluous attribute values by analyzing the dependency relationships among the attributes. And we induce some decision rules from actual data by using the system and test rules to new data, and evaluate that the rules are well suited to them.