• Digital Contents
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• no.12 s.127
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• pp.110-113
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• 2003

지난 10월 29일부터 10월 31일까지 동경 국제 포럼 전시장에서는‘동경 데이터베이스 2003(DATABASE 2003 Tokyo)’ 전시회가 개최됐다. 이와 함께 오사카에서는 10월 29일, 30일 양일간에 걸쳐 ‘인터미디어포럼 2003(INTERMEDIA FORUM 2003)’이 개최됐다. 최근 일본의 데이터베이스 및 GIS, 특허정보 등을 한 눈에 볼 수 있는 동경 데이터베이스 전시회와 인터넷&모바일 솔루션 기술력을 느낄 수 있었던 인터미디어포럼의 현장을 소개한다.

• The KIPS Transactions:PartB
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• v.14B no.6
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• pp.437-444
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• 2007

The objective of this paper is to accommodate the existing motion-capture-based animation to small memories and low computing powers of mobile embedded systems. To use efficiently memories, we propose a paradigm in which a motion capture database is compressed on a PC and so-compressed motion capture database is decompressed little by little on mobile embedded systems and the decompressed data are eliminated right after used. As a compression method for this paradigm we propose an approach that compresses captured motion rendering parameters using a polynomial function fitting method. To enhance its performance we also propose an optimization method for the degree of the polynomial fitting function. Using so-obtained compression method we demonstrate motion-capture-based animation on commercial mobile embedded systems.

• Journal of the Korea Institute of Information and Communication Engineering
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• v.22 no.12
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• pp.1571-1576
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• 2018

Recently, the attractive changes of mobile device are a improvement of the computing performance, dramatic improvement of storage capacity, constant connection to the internet, and sophisticated development of display technology. As a result, database applications utilizing mobile devices are emerging. These applications include databases for mobile servers, databases for edge computing, and fog computing. Therefore, it is important to pay attention to the current mobile database and pay attention to whether it has suitable performance for the applications. In this paper, the most common mobile database, SQLite3 is selected and experimented to test and understand the update performance and characteristics. The results of experiment are compared with the one of Oracle database at the same condition to evaluate the experiment. As a result, Insert Performance of SQLite3 has a lot of points to be improved and Update performance is very good. Especially, the performance of Range Query is excellent.

• Journal of the Korea Institute of Information and Communication Engineering
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• v.24 no.9
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• pp.1117-1122
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• 2020

The improving performance and utilizing application fields of mobile devices are getting bigger and wider. With this trend, applications that use database engines on mobile devices are also becoming common. Applications requiring mobile databases include mobile server databases, edge computing, fog computing, and the like. By the way, the most representative and widely used mobile database is SQLite3. In this paper, we test and compare the update performance of SQLite3 by some file systems. The update performance of the file systems in the mobile environment is an important performance factor in the limited H/W environment. The comparison file system was chosen as FAT, Ext2, and NTFS. Under the same conditions, experiments with each file system to test update performance and characteristics were processed. From the experimental results, we could analyze the advantages and disadvantages of each file system for each database update pattern.

• Proceedings of the Korea Information Processing Society Conference
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• 2006.05a
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• pp.541-544
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• 2006

본 논문에서는 모바일 기기들을 사용하여 언제 어디서나 PC에 접속하여 컴퓨터 시스템을 제어 할 수 있는 시스템을 구현하였다. 이 시스템은.NET과 데이터베이스 기반의 모바일 시스템 설계로 IP address와 데이터베이스를 활용한 모바일 접속을 통하여 PC를 제어하기 위한 모바일 원격 제어 시스템이다. 우선적으로 PC의 전반적인 시스템 제어가 아닌 멀티미디어(음악, 이미지, 동영상 파일)와 Shutdown 실행을 제어하는 기능을 구현하였다.

• Proceedings of the Korea Information Processing Society Conference
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• 2008.05a
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• pp.853-856
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• 2008

최근 모바일 기기 사용자의 수가 증가함에 따라 모바일 기기 사용자의 위치정보를 관리하기 위한 기법들이 활발히 연구되고 있다. 기존의 모바일 시스템에서 위치정보를 관리하기 위한 방법으로 two-tier 방식과 two-tier 방식을 개선한 구조적 기법이 제시되었다. 구조적 기법에서는 어떻게 위치 데이터베이스를 군집화시키는 것이 매우 중요하다. 왜냐하면 데이터베이스를 군집하는 방법에 따라 업데이트 비용의 차이가 크기 때문이다. 구조적 기법을 위한 이전 연구는 set-cover 알고리즘을 기반한 bottom-up 방식의 시스템 이다. 본 논문에서는 구조적 기법의 데이터베이스 군집화를 위해 K-means clustering 알고리즘을 기반한 top-down 방식의 시스템을 사용하였고, 실험을 통해 본 논문에서 제시된 방식의 시스템이 기존 방식의 시스템보다 데이터베이스 업데이트측면에서 13.67%의 성능이 향상되었음을 보였다.

• Proceedings of the Korea Society for Simulation Conference
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• 2002.05a
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• pp.89-94
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• 2002

무선 네트워크의 폭발적인 증가와 함께 이동 통신 기기의 발전은 기존의 유선 일변도의 사용방식을 무선환경으로 급속히 확장, 이전시키고 있다. 무선 환경의 발전에 따라 모바일 데이터베이스 사용의 필요성은 급격히 증대되고 있으며 이에 따른 많은 문제점도 발생하고 있다. 이러한 문제점을 해결하기 위해서 제안된 모바일 데이터베이스 관리 시스템의 효율성 측정과 그룹화를 위한 기초 자료 획득을 목적으로 시뮬레이션을 실시한다. 시뮬레이션의 도메인이 되는 시스템의 4가지 기본 환경을 분석하여 비교 요소를 획득하고 각 환경에서의 결과를 구현된 모바일 그룹핑 서버에 적응 시켜서 시뮬레이션 결과를 구현물의 입력자료로 사용하는 통합 시스템을 구축하였다.

• The KIPS Transactions:PartD
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• v.10D no.3
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• pp.375-386
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• 2003

A rapid growth of mobile devices and a proliferation of wireless networks lead to changing the existing environment into a mobile environment. Expansion of mobile environment makes a pressing need of mobile databases, and there are several solutions to achieve it. But they still accompany with some problems. Especially, the current synchronization server that manages consistently many mobile database management systems is based on the centralized method to synchronize data between the mobile database systems. It is the major factor that causes the lower performance of the whole system. Furthermore, the fault tolerance has not been considered in the existing systems. Therefore, we suggest the mobile agent-based mobile database system in order to resolve the problems. The system, we propose in this paper, provides the high-performance of the whole system by mobile grouping, and also may support a fault-tolerance management method.

• The KIPS Transactions:PartC
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• v.11C no.7 s.96
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• pp.917-922
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• 2004

Mobile ad hoc networks (MANETs) are networks of mobile nodes that have no fixed network infrastructure. Since the mobile node's location changes frequently, it is an attractive area to maintain the node's location efficiently. In this paper, we present an adaptive randomized database group (ARDG) scheme to manage the mobile nodes mobility in MHANETs. The proposed scheme stores the network nodes' location in location databases to manage the nodes' mobility. When a mobile node changes its location or needs a node's location, the node randomly select some databases to update or que교 the location information. The number of the selected databases is fixed in the case of querying while the number of the databases is determined according to the node's popularity in the case of updating. We evaluated the performance of the proposed scheme using an analytical model, and compared the performance with that of the conventional randomized database group (RDG) scheme.

• Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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• 2018.10a
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• pp.108-110
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• 2018

In mobile IT device environments, it is becoming common to use database engine, and new mobile databases are continuously developed and announced. In this paper, the most common mobile database, SQLite3 is selected and experimented to test and understand the update performance and characteristics. The results of experiment are compared with the one of Oracle database at the same condition to evaluate the experiment.