• The Journal of the Institute of Internet, Broadcasting and Communication
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• v.22 no.4
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• pp.17-22
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• 2022

With the spread of web services, data types are becoming more diversified. In addition to the form of storing data such as images, videos, and texts, the number and form of properties and metadata expressing the data are different for each data. In order to efficiently process such unstructured data, a key-value store is widely used for state-of-the-art applications. LSM-Tree (Log Structured Merge Tree) is the core data structure of various commercial key-value stores. LSM-Tree is optimized to provide high performance for small writes by recording all write and delete operations in a log manner. However, there is a problem in that the delay time and processing speed of user requests are lowered as batches of deletion operations for expired data are inserted into the LSM-Tree as special key-value data. This paper presents a Filtered LSM-Tree (FLSM-Tree) that solves the above problem by separating the deleted key from the main tree structure while maintaining all the advantages of the existing LSM-Tree. The proposed method is implemented in LevelDB, a commercial key-value store and it shows that the read performance is improved by up to 47% in performance evaluation.

• Journal of Korean Society of Archives and Records Management
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• v.14 no.2
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• pp.117-128
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• 2014

Social Network Service (SNS) has gained great popularity. Recently, facebook has been used most active. Most of government ministries of Republic of Korea operates facebook. In the case of facebook, it takes advantages of possibilities to inform the direction of policy to aggregate opinions of people for issues. Information gained from facebook has a very important value to be reflected in the policy or to understand public opinions. Long-term storage for this information should be considered. In the case of overseas, tools for long-term storage of documentary facebook have recently been developed. However, it does not save all the data in facebook and ignores the principles for long-term storage. These tools are limited to a simple backup. Therefore, this study aims to investigate how to reproduce, store and collect facebook page records of the government ministries.

• Proceedings of the Korea Information Processing Society Conference
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• 2004.11a
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• pp.165-170
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• 2004

공간 데이터 웨어하우스에서 구축기는 의사절정을 위한 기반 데이터의 구축을 담당한다. 일반적으로 공간 데이터 웨어하우스의 데이터 적재는 잦은 갱신으로 인한 서버의 부하를 줄이기 위하여 구축기에 적재할 데이터를 임시 저장하고 일정주기마다 적재하는 방법을 이용한다. 이때 구축기의 정보는 차원테이블에 대한 갱신정보와 사실 테이블의 일부 갱신정보만을 유지하므로 여러 차원 테이블로 구성된 사실 테이블의 갱신은 공간 데이터 웨어하우스 서버에서 수행해야 한다. 사실 테이블의 갱신연산은 연관된 차원 테이블들에 의해 처리되므로 높은 처리 비용이 필요하다. 따라서 사실테이블의 처리로 인해 적재시간이 증가하며, 이는 사용자의 의사결정 응답시간을 증가시킨다. 본 논문에서는 공간 데이터 웨어하우스의 구축기에서 사실테이블의 사전 계산 기법을 제안한다. 이 기법은 차원 테이블 및 사실 테이블에 대한 메타정보와 추가적으로 기록되어야할 데이터 정보를 구축기에 유지한다. 구축기는 이 정보를 이용하여 삽입 연산시 사실 테이블에 적재할 갱신 정보를 사전에 계산하고, 이를 적재주기에 함께 적재한다. 따라서 사실 테이블의 신을 데이터 적재 이전에 구축기에서 계산하므로 공간 데이터 웨어하우스 서버에서 발생하는 높은 처리 비용을 감소시킬 수 있다. 공간 데이터 웨어하우스 사용자의 의사결정 응답시간을 감소시킨다.

• Proceedings of the Korean Information Science Society Conference
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• 2006.06a
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• pp.205-207
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• 2006

안정성은 가장 중요시되는 컴퓨터의 특성이다. 안정성에 문제가 생긴 경우, 전체의 동작이 중단되어 수정 중이던 데이터가 손실되거나 기존 데이터의 복구가 불가능하게 되는 상황이초래 될 수 있다. 이러한 문제점들을 극복하기 위해 DuaIFS(8), log-structured 파일 시스템[10] 등의 다양한 저널링 파일 시스템들이 사용된다. 특히 Ext3 파일 시스템은 일반적으로 매우 안정적으로 동작하며, 치명적인 문제도 없기 때문에 많이 사용되고 있는 저널링 파일 시스템이다. 하지만 Ext3 파일 시스템의 기본 저널링 모드인 ordered mode는 메타 데이터에 대한 기록을 남기기 위해 여분의 디스크 공간이 필요하고, 저널링을 위한 추가적인 작업이 수행되어야 한다. 본 논문에서는 ordered mode의 추가적인 공간과 추가적인 작업의 필요 없이 저널링을 수행하는 log-ordered mode를 제안한다.

• Journal of Korean Society of Archives and Records Management
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• v.2 no.2
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• pp.69-92
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• 2002

The objective of this study is to examine the re cent trend of the interpretation of the Principle of the Provenance in today s new environment of Archives Management and to identify the effective way of the application of the Principle of Provenance to Archives Management. Because of the continued change and the flexibility of the administrative organization and the development of information network, the traditional concept of the Principle of Provenance which put emphasis on a single creator and the physical entity of the archives has been gradually modified to a rather conceptual, abstract and realistic one. A method to apply the recent concept of the Principle of Provenance is to separate the descriptions of the record entity, the creators and the context and use the organic linkage of the separated description areas. Also we can control the provenance from the current stage or even from the pre-current stage by utilizing the classification scheme and the retention schedule. In case of the electronic records, we can manage the provenance and the context by using metadata inherent in the computerized information system. Above all it is critical that we need to structure and control the provenance by building the Korean rules for archival description corresponding to the international standards. And it is another an essential point that we have to develop a guideline for constructing the fond and maintaining its consistency.

• Korean Journal of Heritage: History & Science
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• v.56 no.2
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• pp.28-45
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• 2023

Although we have entered the era of digital transformation, there is currently no system that efficiently collects, manages, integrates, and services a large number of archaeological digital source materials produced as a result of cultural relics research, i.e., an intelligent integrated management and service platform for archaeological academic information. In this regard, the need to build a digital dictionary of Korean archaeology was confirmed by examining the problem of the Digital Encyclopedia of Korean Archaeology, which is currently available in PDF format on the web, the current status of the publication and use of the Dictionary of Korean Archaeology, and the cases of building digital platforms at home and abroad. Therefore, this paper aims to suggest a general direction for creating a digital encyclopedia of Korean archaeology based on the Dictionary of Korean Archaeology, which includes quality knowledge information, to reconsider the accessibility of archaeological data in conformity with data access limitations. The application of the series Dictionary of Korean Archaeology, published since 2001, and the necessity for digital transformation were examined, as well as the application of data from the archaeological data archiving platforms of Europe, the USA, Japan, and cases of establishing platforms corresponding to specialized encyclopedias from Korea. Based on these, a three-step implementation plan and detailed projects were suggested to create the Digital Encyclopedia of Korean Archaeology. Through this, we proposed the design of metadata for computerized records and the expansion to semantic (meaning-based) data that gives and shows the relationship information between the produced metadata as the implementation tasks to build the Digital Dictionary of Korean Archaeology. It is hoped that such research will help create an integrated intelligent management and service platform for archaeology, raise awareness, and provide a better understanding of Korean archaeology to the general public.

• Journal of Korean Society of Archives and Records Management
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• v.13 no.3
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• pp.127-150
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• 2013

Growing interest in everyday-life archives and community archives leads to the establishment of small-scale archives in the private sector. Interoperability of descriptive information is necessary to be able to have a link between these factors. The purpose of this study is to explore how descriptive information can be interoperable in private archives, which participate in the archives network, and to suggest a direction in organizing the private and community archives network. For this purpose, it investigated the current situation of archival description in small-scale private archives in Korea, especially in terms of collection, and analyzed descriptive information applied to four foreign archives networks. Based on the analysis, it gives some suggestions for sharing descriptive information in Private and Community Archive Network (PCAN) in Korea.

• Journal of KIISE:Computer Systems and Theory
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• v.36 no.4
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• pp.259-273
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• 2009

Most of large-scale distributed file systems decouple a metadata operation from read and write operations for a file. In the distributed file systems, a certain server named a metadata server (MDS) maintains metadata information in file system such as access information for a file, the position of a file in the repository, the namespace of the file system, and so on. But, the existing systems used restrictive metadata management schemes, because most of the distributed file systems designed to focus on the distributed management and the input/output performance of data rather than the metadata. Therefore, in the existing systems, the metadata throughput and expandability of the metadata server are limited. In this paper, we propose a new non-shared metadata management scheme in order to provide the high metadata throughput and scalability for a cluster of MDSs. First, we derive a dictionary partitioning scheme as a new metadata distribution technique. Then, we present a load balancing technique based on the distribution technique. It is shown through various experiments that our scheme outperforms existing metadata management schemes in terms of scalability and load balancing.

• Journal of the Korean BIBLIA Society for library and Information Science
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• v.29 no.2
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• pp.169-197
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• 2018

The research aims to analyze current university information disclosure services in the perspectives of both university records management and services and to recommend ways to improve the current university information disclosure systems and services. The research collects and analyzes various raw data such as laws, guidelines, and manuals of university information disclosure services and the portal site of 'Higher Education in Korea' also known as 'dae-hak-al-ri-mi', and data on each homepage of 40 cooperative universities selected as the research sample. At the result, the research found some limits in the current operation of university information disclosure services: first, the information posted on the university disclosure information system is mostly focused on administrative information rather than information related to research or education within universities. Second, there are the high rate of error and frequent modification in the information posted on the disclosure information system. Third, the menus on both the information disclosure system and homepages of each cooperative university are useless or contents of the menus are empty. The research suggests some solutions to improve these problems: it is required to make up the current legal systems for university information disclosure services and to cooperate all organizations and universities related to university information disclosure services within the united system and rule. Also, it is crucial to attach the metadata of the disclosed information when to post the information to the university disclosure information systems. Finally, it is necessary for each university to employ archivists not only to develop qualified university records to maintain the unique roles and value of universities but also to disclose reliable and authentic information to users and manage the university information disclosure systems effectively and efficiently.

• Journal of the Korean Society for information Management
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• v.29 no.3
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• pp.257-285
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• 2012

As the electronic medical records systems (EMRs) are introduced into the hospitals in Korea and the needs of chief stakehoders of medical records are changed, the environments related to creating and managing medical records has been changed dynamically. At this moment it might be meaningful to examine medical records based on records management principles rather than information management principles. The purpose of this paper is to apply the KS X ISO 1549 standards, which covers the principles of records management, to hospital medical records management and assess the current quality of medical records management, and define a few tasks of improvement for hospitals. To achieve this goal, this study has performed following activities: Firstly, principles that could be applied to medical records management were prepared for each record management steps described in the standards, such as capture, registration, classification, storage, access, trace and disposition, and 22 principles were selected from those 7 steps of the record management. Secondly, the Y hospital, which is affiliated with a medical school in Seoul, was chosen to evaluate the current situation regarding medical records management. The department head of the medical records management team in Y hospital was interviewed and the present status was evaluated according to each principle. Thirdly, tasks for improvement were suggested, in such stages as access, trace and disposition. With this study as a cornerstone, useful implications are expected to be gathered from future studies that apply standards for metadata of records, management systems for records, and record management systems to medical record management in hospitals.