• Genomics & Informatics
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• 제3권2호
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• pp.47-51
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• 2005

Molecular mechanisms of biological processes are typically represented as 'pathways' that have a graph­analogical network structure. However, due to the diversity of topics that pathways cover, their constituent biological entities are highly diverse and the semantics is embedded implicitly. The kinds of interactions that connect biological entities are likewise diverse. Consequently, how to model or process pathway data is not a trivial issue. In this review article, we give an overview of the challenges in pathway database development by taking the INOH project as an example.

• 정보통신설비학회논문지
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• 제11권1호
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• pp.23-28
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• 2012

In this paper, we proposed and developed a fast and efficient real time face detection and recognition which can be run on embedded system instead of high performance desktop. In the face detection process, we detect a face by finding eye part which is one of the most salient facial features after applying various image processing methods, then in the face recognition, we finally recognize the face by comparing the current face with the prepared face database using a template matching algorithm. Also we optimized the algorithm in our system to be successfully used in the embedded system, and performed the face detection and recognition experiments on the embedded board to verify the performance. The developed method can be applied to automatic door, mobile computing environment and various robot.

• Journal of Information Processing Systems
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• 제11권3호
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• pp.389-405
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• 2015

Most traditional database systems exploit a record-oriented model where the attributes of a record are placed contiguously in a hard disk to achieve high performance writes. However, for read-mostly data warehouse systems, the column-oriented database has become a proper model because of its superior read performance. Today, flash memory is largely recognized as the preferred storage media for high-speed database systems. In this paper, we introduce a column-oriented database model based on flash memory and then propose a new column-aware flash indexing scheme for the high-speed column-oriented data warehouse systems. Our index management scheme, which uses an enhanced $B^+$-Tree, achieves superior search performance by indexing an embedded segment and packing an unused space in internal and leaf nodes. Based on the performance results of two test databases, we concluded that the column-aware flash index management outperforms the traditional scheme in the respect of the mixed operation throughput and its response time.

• 한국멀티미디어학회논문지
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• 제9권4호
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• pp.401-413
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• 2006

본 논문은 모바일 단말기를 위한 MPEG-7 기반의 비디오 관리 시스템 MVMS(MPEG-7 Based Video Management System for Mobile Device)를 제안한다. 기존의 MPEG-7 응용들은 대부분 데스크탑 환경에서 MPEG-7 문서를 파일 시스템 기반으로 관리한다. 이에 비해, MVMS는 모바일 단말기 환경에서 MPEG-7 문서를 내장형 데이터베이스 시스템을 이용하여 필요한 정보만 관리하기 때문에 리소스가 부족한 모바일 단말기 환경에서 효율적으로 활용할 수 있다. MVMS는 비디오 세그먼트별 키 이미지 추출과 MPEG-7 문서 편집 기능을 지원한다. 또한, 내장형 데이터베이스를 통해서 MPEG-7 데이터를 관리하기 때문에 다중 문서의 검색과 관리가 가능하다.

• 대한임베디드공학회논문지
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• 제6권3호
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• pp.190-200
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• 2011

Android platform provides a content provider and a cursor mechanism to access the internal SQLite engine. Content providers not only store and retrieve data but also make it accessible to applications. Applications can only share data through content provider, since there's no common storage area that Android packages can access. Cursor is an interface that provides random read-write access to the result set returned by a database query. However, this cursor possesses two major limitations. First, a cursor does not support a join clause among cursors, since the cursor can only access a single table in the content provider. Second, the cursor is not capable of creating user-customized field in the predefined content providers. In this paper, we propose the unified cursor architecture that merges several cursors into a single virtual cursor. Cursor translation look-aside buffer (TLB), column windowing mechanism and virtual data management are the three major techniques we have adopted to implement our structure. And we also propose a delayed synchronization method between an application and a proposed unified cursor. An application can create a user-customized field and sort multiple tables using a unified cursor on Android platform.

• 대한전기학회:학술대회논문집
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• 대한전기학회 2006년도 심포지엄 논문집 정보 및 제어부문
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• pp.267-269
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• 2006

Recently, flash memories are one of best media to support portable computer's storages in mobile computing environment. The features of non-volatility, low power consumption, and fast access time for read operations are sufficient grounds to support flash memory as major database storage components of portable computers. However, we need to improve traditional Indexing scheme such as B-Tree due to the relatively slow characteristics of flash operation as compared to RAM memory. In order to achieve this goal, we devise a new indexing scheme called F-Tree. F-Tree improves tree operation performance by compressing pointers and keys in tree nodes and rewriting the nodes without a slow erase operation in node insert/delete processes.

• 한국정보통신학회:학술대회논문집
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• 한국정보통신학회 2016년도 춘계학술대회
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• pp.390-391
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• 2016

SQLite는 리소스 제약이 큰 소형 기기에 적합한 데이터베이스 엔진이며 리눅스 기반 모바일 기기에 많이 사용되고 있다. SQLite는 오픈소스 프로그램이며 가볍고 속도가 빠른 장점을 지닌다. 이 논문에서는 리눅스 기반 환경에서 SQLite 데이터베이스의 검색 성능을 테스트하여 장단점을 분석하고자 한다. 분석은 같은 환경에서 실행되는 다른 데이터베이스와 비교하여 진행한다.

• 한국산학기술학회논문지
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• 제12권7호
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• pp.3227-3235
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• 2011

이 논문에서는 관계형 임베디드 DBMS를 설계하고 프로토타입 Miracle RDBMS(MDB)를 개발하였다. MDB는 C로 개발되었고, 로컬에서 동작하며 유닉스와 윈도우즈 계열에서 운영 가능하다. SQL 인터페이스와 API 함수를 통해 데이터베이스를 접근하며 $B^+$ 트리 인덱스를 사용한다. 트랜잭션의 ACID를 보장하고 저수준의 잠금, 단일 테이블에 대한 SQL 문을 처리한다. 데이터의 처리 성능을 평가하기 위해 ARM용 EZ-S3C6410 보드를 이용하여 데이터 적재, 검색, 수정 및 삭제하는데 걸리는 시간을 실험하였다. SQLite와 처리시간을 비교해 보았는데 단위 연산에 대한 평균 처리시간이 SELECT와 INSERT에서 MDB가 각각 38.46%, 22.86% 더 빨랐으며, UPDATE와 DELETE에서 SQLite가 각각 28.33%, 26.00% 더 우수하였다. 이 실험은 데이터베이스에서 데이터를 가져오고 보내는 작업이 MDB에서 더 빠른 반면, $B^+$ 트리 인덱스는 SQLite에서 더 효율적으로 구축되었음을 보여준다.

• 대한전자공학회:학술대회논문집
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• 대한전자공학회 2000년도 추계종합학술대회 논문집(4)
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• pp.207-210
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• 2000

We propose a content based watermarking technique in multimedia management system. In the proposed technique, a content description technique of MPEG-7 for the multimedia database is adopted into a watermarking technique. With multimedia features described by MPEG-7 standard, we propose a novel watermarking technique where MPEG-7 descriptors are regarded as perceptually significant portions. The watermark is embedded in cooperating with multimedia features such as MPEG-7 descriptor. To verify the feasibility and performance of proposed watermarking technique, experiments with the MPEG-7 database are performed.

• International journal of advanced smart convergence
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• 제9권3호
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• pp.239-245
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• 2020

The Ewha Music Database (EMDB) is an online database comprised of primary source materials related to music education from East Asia during the modern era (1880 to 1945) when Korea, Japan, and China were geopolitically and culturally intertwined. We developed the incipit search in EMDB as an embedded tool. This is the first attempt in Korea to implement a unique search function of musical data using alphabets of musical notes. Unlike in traditional search system that uses general literature information search conditions, such as author, title, publisher, year, number of pages, etc., it offers a new way of searching a musical piece/work and sheet music. This study confirms that digital information technology is an important methodology for research of music culture as a field of humanities.