• KSII Transactions on Internet and Information Systems (TIIS)
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• v.7 no.6
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• pp.1398-1417
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• 2013

A method is proposed to reduce excess resources from a virtual machine(VM) while avoiding subsequent migrations for a computer cluster that provides cloud service. The proposed scheme cuts down on the resources of a VM based on the probability that migration may occur after a reduction. First, it finds a VM that can be scaled down by analyzing the history of the resource usage. Then, the migration probability is calculated as a function of the VM resource usage trend and the trend error. Finally, the amount of resources needed to eliminate from an underutilized VM is determined such that the migration probability after the resource reduction is less than or equal to an acceptable migration probability. The acceptable migration probability, to be set by the cloud service provider, is a criterion to assign a weight to the resource reduction either to prevent VM migrations or to enhance VM utilization. The results of simulation show that the proposed scheme lowers migration frequency by 31.6~60.8% depending on the consistency of resource demand while losing VM utilization by 9.1~21.5% compared to other known approaches, such as the static and the prediction-based methods. It is also verified that the proposed scheme extends the elapsed time before the first occurrence of migration after resource reduction 1.1~2.3-fold. In addition, changes in migration frequency and VM utilization are analyzed with varying acceptable migration probabilities and the consistency of resource demand patterns. It is expected that the analysis results can help service providers choose a right value of the acceptable migration probability under various environments having different migration costs and operational costs.

• Journal of Family Resource Management and Policy Review
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• v.7 no.2
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• pp.1-23
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• 2003

Entering into the mature stage of internet society, we need to understand people's internet using qualitatively. So, this study purposed to relate the types of internet usage and the types of household work using internet by the family except housewife. Web-based questionnaire were administered to 250 male and female subjects respectively. Results were as follows: First, types of internet usage were‘e-style’,‘self-actualization’, and‘family-oriented’. Second, the characteristics of e-style were white collar, college- graduated, and high income. And this type had positive attitude about internet, longer periods of usage, higher level of computer skill, longer usage time than my other types. Third, types of household work using internet were‘commitment in transaction’and‘strong involvement in family life’. fourth, the e-style and the self-actualization were related with the type of commitment in transaction and the family oriented was related with the type of strong involvement in family life. Finally, if the e-style increase, family members except housewife, there are trend of commitment in the household work.

• Journal of Korean Society of Rural Planning
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• v.11 no.3 s.28
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• pp.19-27
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• 2005

Rural Korea has been becoming heavily aged societies from the end of 20th century due to the massive depopulation of young generation and extension of the average span of human beings. Although rural communities in Korea had been traditionally based on closely webbed social relations, almost all of community self-help organizations disappeared in recent time with very strong urbanization trend. However, almost all rural villages in Korea have the village seniors' union -'NO-IN-HOE' in Korean speaking- of which members usually use, operate and maintain community facilities in terms of voluntary base. Using these facilities, most of public/common/private services and community activities have been being served or provided. So, the purpose of this study is to investigate the usage tendency of community facilities and needs of the rural elderly and to propose the improvement strategies for their optimum usage. For this purpose, data was gathered both from community (107 villages) and individual level surveys(881 older people). The statistical method used for data analysis was descriptive statistics. The major findings were as follows : It was found that the dominant family type of the rural elderly was elderly-only household (75%) with very limited economic capability. There are 2$\sim$3 common community facilities with village including the seniors' center -'KYOUNG-RO-DANG' in Korean speaking. Many of the elderly (74%) use the center once or twice per week. There are several rooms in the center, like as kitchen bathroom and health room, of which usage frequency differs respectively. Many rural elderly want assistance from out-of-village for good maintenance and free use of these facilities.

• Current Industrial and Technological Trends in Aerospace
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• v.7 no.2
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• pp.40-47
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• 2009

In this paper, current industrial trend of simulator development which is widely spreaded and performed in globally is introduced. Usage of satellite simulator is becoming an essential choice since the complexity of satellite and mission is being continuously increased. Satellite simulation brings reduction of satellite development cost and of period which is consumed by test on satellite development for various phases. Further more, it can be used to reduce the development period of satellite since developed resource and knowledge is possible to be delivered to next program effectively.

• Resources Recycling
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• v.17 no.4
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• pp.66-76
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• 2008

Silicon wafer is used in making semiconductor device of various forms in the semiconductor industry. Silicon wafer is produced by cutting silicon ingot and sludge containing silicon results from cutting process. The amount of silicon sludge is increasing owing to the usage of semiconductor device in many industry sectors. These days the recycling technologies of the waste silicon sludge has been widely studied from view point of economy and efficiency. In this study, patents on the recycling technologies of the waste silicon sludge were analyzed. The range of search was limited in the open patents of USA, European Union, Japan, and Korea up to september, 2007. Patents were collected using key-words and filtered by filtering criteria. The trend of the patents was analyzed by the years, countries, companies, and technologies.

• Resources Recycling
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• v.28 no.1
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• pp.3-14
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• 2019

Copper is used in many electronic components and construction parts due to its excellent electrical conductivity and heat transfer characteristics, and also used for pre-plating for double layer coating such as nickel, so that copper is an essential material in modern industry. Despite the expected increase of usage and importance on wiring, sensors and data equipment in the next generation industries, it is hard for securing stable copper supply and resource management resulting from the copper prices are fluctuating owing to the economic crisis in Europe, the low economic growth trend in China, and President Trump's commitment to public industrial facilities investment in U.S.. Since most of the domestic copper consumption is used by electrolytic copper cathode, we studied not only copper recycling technology which is being commercialized but also current research trend under the research stage. This study aims to examine the characteristics of each process and the areas where future recycling technology development is required.

• The Journal of the Korea Contents Association
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• v.12 no.2
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• pp.19-29
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• 2012

Currently, cloud computing technology is being supplied in various service forms and it is becoming a ground breaking service which provides usage of storage service, data and software while user is not involved in technical background such as physical location of service or system environment. cloud computing technology has advantages that it can use easily as many IT resources as it wants freely regardless of hardware issues required by a variety of systems and service level required by infrastructure. Also, since it has a strength that it can choose usage of resource about business model due to various internet-based technologies, provisioning technology and virtualization technology are being paid attention as main technologies. These technologies are ones of important technology elements which help web-based users approach freely and install according to user environment. Therefore, this thesis introduces software-related technologies and architectures in an aspect of grid for building up high availability cloud computing environment by analysis about cloud computing technology trend.

• Journal of the Korean BIBLIA Society for library and Information Science
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• v.28 no.3
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• pp.197-215
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• 2017

Researchers often cite Internet-based information as references for their research papers, and the amount of this type of citation has continued to grow, which resulted in the increased significance of Internet-based academic resources. This study first examines the current trend of citing Internet-based resources in the academic communication process of all academic fields, and then attempts to analyze the factors, such as gender and age, affecting this trend and its consequences in the specific area of LIS in Korea. For this, the author adopt both citation analysis and statistical analysis as research methods. Overall increase of citing internet-based resource is confirmed in all academic fields. Specific analysis of the LIS field revealed that gender is related with the degree of usage, and the age with whether or not adopting this type of citation. Meanwhile, the subject area of the researchers is related with both whether or not adopting this method and the degree of it. This study provides understanding current status of increased utilization of Internet-based resources in academic communications, and further makes suggestions for the effective academic communication of the future.

• Spatial Information Research
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• v.8 no.2
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• pp.191-201
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• 2000

Recently, tourism industry is on the trend of expanding its activity arena, boosted by revitalization of regional economy and reorganization of urban environment, undertaken for the purpose of place marketing. However, Korea has not been able to develop a variety of tourism itineraries that can attract the interest of tourists because most tourism resources are isolated with single function. This constraint has prevented tourism industry in Korea from attaining competitiveness. In attempting to overcome this constraint, this study seeks to develop tourism itineraries by constructing and utilizing database on historical and cultural tourism resources based on the case of Kangneung City. Through the construction of information system on historical and cultural resources and tourism support facilities, optimal tourism itineraries that take into account maintenance conditions, types, values, lodging availabilities and accessibility of tourism resource areas can be developed. Moreover, it is expected that this information system will have a high level of usage in the future, for it can provide a wide range of tourism services on the internet and education materials as well as facilitate resources management.