• Journal of the Institute of Electronics and Information Engineers
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• v.53 no.12
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• pp.94-102
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• 2016

Recently, the I/O performance of a single node is rapidly improving due to the advent of high-performance SSD. As a result, the next-generation storage platform based on SSD has received a great deal of attention and such storage platforms are increasingly adopted to commodity servers or data centers that look for the high-bandwidth computation and I/O. However, building all SSD-based storage platform may not be cost-effective because the price per storage capacity is very high as compared to that of HDD. In this paper. we propose a hybrid file management solution, called HyPLVM(Hybrid Priority Logical Volume Manager), which combines the strength of SSD with the desirable aspects of low-price, high-storage capacity HDD. HyPLVM prioritizes the files and directories to be accessed by users, in order to determine the target storage device (SSD/HDD) in which files are allocated, while mitigating the cost of building storage platforms.

• Archives of design research
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• v.17 no.4
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• pp.79-88
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• 2004

This study is aimed to grasp the organization of Internet information resources and to infer the characteristics of resource search engines so that criteria may be established to classify and evaluate Internet information resources. In addition, the author has compared and analyzed interior design classification systems of directory sites of each subject that provide classification system based on the Internet, foreign sites to be used to search for information, and domestic information-specialized sites in order to set up models of interior design classification systems of directories of each Web subject. The systems have been analyzed against such four measures as comprehensiveness of the subject scope, logicality of classification systems, preciseness of subject terms, and effectiveness of searches. Information of interior designs is mixed with that of related fields, and so its information search and classification are not organized systematically. The author has analyzed such a problem so as to present models of search engine classification systems for interior design information classification after considering both academic and practical aspects.

• The Journal of the Institute of Internet, Broadcasting and Communication
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• v.17 no.5
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• pp.223-229
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• 2017

This paper proposes the Global Clipboard System and presents a preliminary study on it. The clipboard is a temporary storage used to copy and paste some contents between application programs in Windows Operating System. The proposed Global Clipboard is a contents delivery system that extends the concept of the existing local clipboard to Internet. The Global Clipboard System operates in two steps. An application user can upload selected contents to the Global Clipboard by typing consecutive keys of Ctrl-C and Ctrl-Shift-C easily. And other users can download and utilize the contents from the Global Clipboard by typing Ctrl-Shift-V and Ctrl-V keys consecutively. The proposed Global Clipboard can deal almost data like simple texts, screen capture images, files, and directories. In this paper, we developed a global clipboard server, a Windows application, and an Android application. We have conducted experiments about functions of the Global Clipboard and also compared delay times between 4 applications such as e-mail, Kakao, Google Drive, and the Global Clipboard. The results of the evaluation show that the time delay spending in sending and receiving contents is shortest when the Global Clipboard is used.

• Journal of Information Management
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• v.38 no.1
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• pp.21-36
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• 2007

This study aimed to investigate present status of online reference shelf and analyze access point in the home page and types of online reference sources in the university library. Data were collected by accessing home pages of 41 university libraries in the region of Seoul and Kyonggi-Do. 30 libraries had prepared reference shelf out of 41 libraries, and "User Service", "Electronic Reference Sources", or "Reference & Information Sources" were mostly used as home page menu. Types of references sources varied among libraries, and "Directories", "Dictionaries", "Statistics" or "Encyclopedias" were mostly loaded types in the reference shelf. For the enhancement of reference services through reference shelf, establishing and applying standards for evaluation, ease of access, access by subject, and continuous updates and additions of reference sources were suggested.

• Journal of Families and Better Life
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• v.21 no.3
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• pp.75-85
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• 2003

This study is aimed at sowing two purposes. The first is to analyze the real condition and demand of profession development from the human ecology majors. The second is to develop necessary methods in which ordinary people can collect necessary information about family life. Related questionnaire was distributed to 147 the human ecology majors, and analysis was performed on the several web sites providing with information related to family life. Web sites such as“www.yahoo.com”and“www.naver.com”were included in the analysis. Questionnaire consisted of questions about whether the students majoring in the human ecology were familiar with the information-related terms or futuristics-related books, and whether they have ever taken the related courses in college. The results of analysis are as follows: First, analysis shows that the present level of the human ecology majors' information orientation and networking experiences is extremely low. Secondly, according to the analysis on whether they have optimistic or pessimistic attitude toward the contemporay informatized society, the human ecology majors have rather optimistic attitude in group while having pessimistic one individually. As to their response to the question about whether informatized society is connected with industrial society or not, the human ecology majors are divided in neatly equal ratio. Thirdly, analysis of the human ecology majors' understanding of profession relevant to their major indicates that they have high level of perception and information about the professions of fashion designing, traditional garment designing, nutrition counselling or consumer counselling. On the other hand, they are not familiar with the information about professions such as professional QR Programming, eating habit-related information business and family welfare. Lastly, level of web sites supplying information about family life is fragmentary. Especially, probe into the directories providing with necessary information of family life subdivided into special areal of life shows that they lack systematic organization making more convenient consumer use.

• Journal of Cadastre & Land InformatiX
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• v.45 no.1
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• pp.241-256
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• 2015

The purpose of this paper is to verify the spatial distribution difference between formation and dissolution of start-up firms related to life-cycle. For this purpose, a Korean business directories and information on business closures were used, and location information, starting time, and closure time of start-up firms in the Seoul metropolitan region from 2007 to 2009 were generated in this study. It applied The spatial distribution analysis methods on the formation and dissolution of the start-up firms included Barcki measurements and global spatial autocorrelation. The total number of start-up firms was 5,810, and their five-year survival rate was 77.25%. The dissolution pattern of the start-up firms was dispersed more than their formation pattern in each of the Seoul metropolitan regions, the city of Seoul, and the city of Incheon-Gyeonggi province. In addition, differences between the formation and dissolution patterns according to size and industry category of the firms were confirmed.

• Journal of the Korean association of regional geographers
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• v.4 no.2
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• pp.65-77
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• 1998

One of the fundamental, important preconditions for effective teaching of geography is to collect a variety of picture data available for class and to manage the data systematically. The purpose of this study is to present one method about how to supply basic picture data available for class of Korean geography for the high school program to teachers in service and how to collect, manage and utilize the data. A total of 233 picture data related to contents of the textbook of Korean Geography have been gathered through this study, and a database has been constructed for the data. Directories were generated for individual units of the textbook, and the collected picture data was stored in the image file of each directory. This data was recorded in a CD and attached as an appendix. Since the primary purpose of this study is to suggest one method, the picture data in a database for the present study is just a fraction of lots of data available for class of Korean geography. If the user persistently enlarges and manages data based on the results of this study, the data will become a good instructional aid. The picture data can be printed over the transparent film and used for class by using the overhead protector (OHP), or it can be also used as a remote self-study tool through the computer telecommunications network (e.g., LAN or INTERNET. etc,). Most desirable, however, is to develop teachers' own method by taking account of separate units of the textbook or diverse educational environments.

• The Journal of the Korea Contents Association
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• v.19 no.5
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• pp.417-425
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• 2019

Storage snapshot technology allows to preserve data at a specific point in time, and recover and access data at a desired point in time. It is an essential technology for storage protection application. Existing snapshot methods have some problems in that they dependent on storage hardware vendor, file system or virtual block device. In this paper, we propose a new snapshot method for solving the problems and creating snapshots on-line. The proposed snapshot method uses a method of extracting the log records of update operations at the virtual file system layer to enable the snapshot method to operate independently on file systems, virtual block devices, and storage hardwares. In addition, the proposed snapshot mehod creates and manages snapshots for directories and files without interruption to the storage service. Finally, through experiments we measure the snapshot creation time and the performance degradation caused by the snapshot.

• Journal of the Korea Institute of Information and Communication Engineering
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• v.25 no.10
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• pp.1397-1402
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• 2021

The overlay2 file system is one of the union file systems that mounts multiple directories into one. The source directory used for this overlay2 file system mount has a characteristic that it operates independently of the write-able layer after mounting, so it is often used for container platforms for application delivery. However, the overlay2 file system has a security vulnerability that the write-able layer is also modified when file in the source directory is modified. In this study, I proposed the overlay2 file system protection technology to remove the security vulnerabilities of the overlay2 file system. As a result of empirically implementing the proposed overlay2 file system protection technology and verifying the function, the protection technology proposed in this study was verified to be effective. However, since the method proposed in this study is a passive protection method, a follow-up study is needed to automatically protect it at the operating system level.

• Journal of the Korea Institute of Information Security & Cryptology
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• v.13 no.5
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• pp.91-104
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• 2003

A masquerader is someone who pretends to be another user while invading the target user's accounts, directories, or files. The masquerade attack is the most serious computer misuse. Because, in most cases, after securing the other's password, the masquerader enters the computer system. The system such as IDS could not detect or response to the masquerader. The masquerade detection is the effort to find the masquerader automatically. This system will detect the activities of a masquerader by determining that user's activities violate a profile developed for that user with his audit data. From 1988, there are many efforts on this topic, but the success of the offers was limited and the performance was unsatisfactory. In this report we propose efficient masquerade detection system using SVM which create the user profile.