• The Journal of the Korea institute of electronic communication sciences
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• v.15 no.4
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• pp.679-686
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• 2020

With global data totals expected to grow to 175 ZB by 2025, data processing capabilities in the network area are becoming more important. In particular, data centers are becoming more stubborn as data usage increases, and the load generated by incoming data should be appropriately distributed to reduce costs and efficiently operate. The SDN technology, which emerged to overcome the limitations of the existing network system, removes rigidity of the Legacy system by separating H/W and S/W from the network equipment, and can be effectively applied to load balancing in the data center using S/W-based flexibility. In this paper, we propose ways to increase efficiency by classifying data received from users by type by utilizing SDN technology, and transmitting and processing classified data in order of response speed of servers in the data center.

• Journal of the Korean Society for Library and Information Science
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• v.40 no.4
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• pp.85-110
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• 2006

Recently, there have been a number of news reports on natural disasters, like earthquakes. typhoons, floods and tsunami, all over the world. Korea does not seem to be safe from such disasters or terror threats. As places with high numbers of visitors. libraries need to take preventive measures to be prepared for such disasters and threats. This paper analyzes the current status of emergency measures adopted by 75 public libraries in Seoul. Daejeon and Jeonbuk in Korea. For each library surveyed. the causes of and ways to recover from disasters were reviewed and detailed analyses were carried out in low areas: Implementation of preventive measures disaster management and equipment, status of human resources and assignment of people to disaster recovery, safety courses offered to library users and training methods. In addition, each area was analyzed in regard to possible solutions and ideas for improvement, as well as suggestions to upgrade disaster recovery systems in the future.

• Journal of the Korea institute for structural maintenance and inspection
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• v.12 no.2
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• pp.75-82
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• 2008

There are almost 18,000 dams including about 1,200 large dams in Korea. The large dams are well operated and maintained by KWATER(Korea Water Resource Corporation), KRC(Korea Rural Community & Agriculture Corporation) and KHNP(Korea Hydro & Nuclear Power Co., Ltd.). Several research reports concern with the safety of these large dams are presented but there is no paper concerned with small dams which has diversion tunnel through the dam body. The purpose of this study is to show the common defects of small dams according to various cases of degradation of dams and the repair and retrofit methods which applied to the damaged dams. And this study performed resistivity survey to evaluate the effect of retrofitting dam. Also, this study tries to present the solution which concerned with these common defects in maintenance and design steps.

• Microbiology and Biotechnology Letters
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• v.23 no.3
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• pp.365-371
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• 1995

Filamentous bacteria and other large microorganisms, which are useful indicators of bulking and poeration, were identified by microscopic observation. Activated sludge samples were taken from the aeration basin of 5 municipal wasterwater plants and 6 industrial ones. Among the filamentous bacteria founds, Microthrix parvicella was most frequently present, followed by type 0041, type 1701 and Nocardia. This frequency of occurrence was similar to those reorted in USA and the Neterland. The morphology of filamentous bacteria observed were generally identical with those previously reported. except type 1701 which had slender filament diameter. Among protozoa, Vorticella was most frequently present, followed by Aspidisca, Opercularia and Difflugia. Philodina was the only metazoa observed. Both filamentous bacteria and protozoa would be useful indicator organisms. The potential for these organisms as indicators were discussed.

• Journal of the Society of Disaster Information
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• v.8 no.4
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• pp.419-431
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• 2012

This paper takes precautions proposals against prospective disasters from the space weather maximum in 2013. A geomagnetic space storm sparked by a solar maximum like the one that flared toward earth is bound to strike again and could wreak havoc across the modern world. The purpose of the study is that the disaster reduction and safety service implementation study on the ultimate space weather systems by the information systems of the space weather. The process methods of the study are that an implementation of preparation for the smart IT and GIS based disaster management systems of the solar maximum deal with analysis on the flare, solar proton event, and geomagnetic storm from space blasters, These approach and methods for the solar maximin display national policy implementation of the pattern of the radio wave disasters from the protection and preparation methods. This research can provide affective methods for the saving lives and property protections that implementation of the disaster prediction and disaster prevention systems adapts the smart IT systems and converged decision making support systems using uGIS methodology.

• Journal of the Korea Academia-Industrial cooperation Society
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• v.16 no.5
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• pp.3525-3534
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• 2015

One of the most important requirements in the development of asset management system of wastewater facilities is to determine the level of management of the service related to supply of wastewater. After the sewage facilities were built, many parts of the replacement or repair items will be occurred by the requests of the users on the way of operation and management. To manage the level of those services, where site and which complains is occurred have to be searched, and have to setting the aim of managing the service for objects to improvement. In this study, the complaints related with the sewage of S-area were analyzed, in which is progressed the domestic asset management development for the facilities and pipes related to wastewater. Based on these complaints data, the regional characteristics of S-area by causes and subject of complaints is analysed, and developed more detail management standard than current level. And also service level management strategies of advanced asset management benchmark agency for improving to service level management standard is compared and constructed basement for building the best practice of S area.

• The KIPS Transactions:PartD
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• v.16D no.5
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• pp.651-660
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• 2009

This study is to develope the structures and the elements of the metadata for harvesting, management and preservation of a valuable web resources in the web archiving. For this study, we investigated the available metadata in the web archiving and surveyed the requirements of web archiving process. And we analyzed the characteristics of web resources. Also, this study was used a based on the ISO 14721 OAIS Reference Model. Finally, to share the metadata elements among the web archiving system, this study considered the interoperability for the exchange of the metadata. Based on the result, this study designed four structures of the metadata and defined the 28 core metadata elements for the web archiving.

• KIPS Transactions on Computer and Communication Systems
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• v.2 no.8
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• pp.349-356
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• 2013

As various features of the smartphone have been used, a lot of information have been stored in the smartphone, including the user's personal information. However, a frequent update of the operating system and applications may cause a loss of data and a risk of missing important personal data. Thus, the importance of data backup is significantly increasing. Many users employ the backup feature to store their data securely. However, in the point of forensic view these backup files are considered as important objects for investigation when issued hiding of smartphone or intentional deletion on data of smartphone. Therefore, in this paper we propose a scheme that analyze structure and restore data for Kies backup files of Samsung smartphone which has the highest share of the smartphone in the world. As the experimental results, the suggested scheme shows that the various types of files are analyzed and extracted from those backup files compared to other tools.

• Journal of the Korean Society for Library and Information Science
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• v.52 no.1
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• pp.469-490
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• 2018

The purpose of this study is to analyze the status of interlibrary loan (ILL) services using data from its transection. While analyzing the ILL data, agenda to improve the quality of services was identified, and suggestions were made to address them. Three data sets including National Inter-Libary Loan data, National Library Statistics System data, and local inter-library loan system analysis data were collected and analyzed. The results indicate that the size of transaction in ILL is getting bigger. The local ILL, particularly, was expanded and actively used by people. Additionally, the type of library participating in ILL networks was diverse and the number of library was increasing. Finally, this study discussed the tool to measure the contribution of each library in ILL. The collection uniqueness and collaboration index of library as well as the ILL statistics should be considered in the process of the tool development.

• Journal of the Korean Society for Library and Information Science
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• v.49 no.4
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• pp.265-288
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• 2015

This study analyzed the contracts for library remuneration, amount of the remuneration, average amount of the remuneration in relation to kinds of libraries, distribution of the remuneration, and types and publication year of the works to be collected remuneration based on the data during 2004~2014 from the KORRA. As results, current library remuneration system has limitations for libraries to digitize and transmit to the public their collections, Also, there are some limitations to the protection for copyright holders because the amount of the remuneration collected from libraries has declined and non distribution remuneration has been so high. This study suggested that the library remuneration system needs to be revised considering the scope of library materials to be digitized and predicted frequency of use. Also, the better practical solution to protect copyright holders is not a raise of the library remuneration but the efficient use of the non distribution remuneration.