• Journal of Internet Computing and Services
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• v.15 no.4
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• pp.125-133
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• 2014

The column-oriented database storage is a very advanced model for large-volume data analysis systems because of its superior I/O performance. Traditional data storages exploit row-oriented storage where the attributes of a record are placed contiguously in hard disk for fast write operations. However, for search-mostly datawarehouse systems, column-oriented storage has become a more proper model because of its superior read performance. Recently, solid state drive using MLC flash memory is largely recognized as the preferred storage media for high-speed data analysis systems. The features of non-volatility, low power consumption, and fast access time for read operations are sufficient grounds to support flash memory as major storage components of modern database servers. However, we need to improve traditional transaction management scheme due to the relatively slow characteristics of column compression and flash operation as compared to RAM memory. In this research, we propose a new scheme called Column-aware Multi-Version Locking (CaMVL) scheme for efficient transaction processing. CaMVL improves transaction performance by using compression lock and multi version reads for efficiently handling slow flash write/erase operation in lock management process. We also propose a simulation model to show the performance of CaMVL. Based on the results of the performance evaluation, we conclude that CaMVL scheme outperforms the traditional scheme.

• The KIPS Transactions:PartD
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• v.11D no.7 s.96
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• pp.1409-1416
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• 2004

Recently, due to the popularity and explosive growth of the Internet, information exchange is increasing dramatically over the Internet. Also the XML is becoming a standard as well as a major tool of data exchange on the Internet. so that in retrieving the XML document. the problem for speeding up evaluation of path-oriented queries is a main issue. In this paper, we propose a new indexing technique to advance the searching performance of path-oriented queries in document databases. In the new indexing technique, an abbreviation-path file to perform path-oriented queries efficiently is generated which is able to use its hash-code value to index keys. Also this technique can be further enhanced by combining the Extendible Hashing technique with the abbreviation path file to expedite a speed up evaluation of retrieval.

• Journal of the Korean Society of Propulsion Engineers
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• v.11 no.2
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• pp.62-70
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• 2007

The aiming ability is a to improve accuracy performance of the firing vehicle. This paper describes the detection method of chatter vibration using disturbance acceleration in the pointing structure. In order to analysis vibration trends of the pointing system occurred during vehicle drive, acceleration data was processed by using data processing algorithm with moving average and Hilbert transform. Specific mode constants of acceleration were obtained under various disturbances. Vehicle velocity, road condition, property of pointing structure were considered as factors which make change of vibration trend in vehicle dynamics. Finally, back propagation neural networks have been applied to the pattern recognition for the classification of vibration signal in various driving conditions. Results of signal processing were compared and analysed.

• Journal of the Korean Society of Clothing and Textiles
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• v.28 no.12 s.138
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• pp.1632-1643
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• 2004

The competitiveness of the domestic cosmetics market will improve more rapidly when efficient market segmentation is secured, qualitative information about each of the segmented markets is gathered, and adequate marketing strategies to meet the demands of each segmented markets is established. Therefore, continuous studies are needed to secure qualitative information for market segmentation. In order to find out whether the domestic cosmetics market could be segmented according to consumers' shopping orientation, the present study analyzed cosmetics purchasing behavior, complaint behavior, and demographic characteristics of each consumer group classified according to their shopping orientation. The study was implemented by a normative-descriptive survey method using a questionnaire. Three groups of consumers were identified according to their shopping orientation: price-oriented group, information-oriented group, and brand-oriented group. It was confirmed that the groups, classified according to shopping orientation, have significantly different demographic, purchasing, and complaint behavior. Therefore, shopping orientation should be carefully considered in the segmentation of the cosmetics market.

• Proceedings of the Korean Information Science Society Conference
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• 1999.10a
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• pp.311-313
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• 1999

Xmas-SX는 지능형 교통 시스템, 이동통신과 같은 새로운 공간 응용 분야의 고성능 데이터베이스 요구를 만족시키기 위한 주메모리 공간 저장 시스템이다. 본 논문에서는 Xmas-SX의 성능을, 디스크 기반 객체지향 DBMS와의 비교를 통하여 평가한다. 갱신 연산과 공간 영역 질의를 대상으로 하였으며, 그 결과 Xmas-SX가 갱신 연산의 경우 최고 수십 배 좋은 성능을 보였다. 공간 영역 질의의 경우에는 약간 좋은 성능을 보였다. 이를 통해 Xmas-SX가 공간 데이터베이스에 대한 갱신 연산이 빈번한 응용분야에 적용가능함을 보였다.

• Proceedings of the CALSEC Conference
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• 1998.10b
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• pp.477-486
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• 1998

여러 산업 분야에서 인터넷의 채택으로 인터넷을 기반으로 하는 전자상거래 시스템 구축이 일반화되고 있으며, 전자상거래에 연관된 표준들이 제기되고 있다. 전자상거래가 인터넷의 네트워크를 고려한다면, 전자상거래 시스템은 클라이언트/서버나 분산 아키텍쳐를 요구한다. 즉, 객체지향 패러다임이 새롭고 효율적인 개발 방법으로써 널리 받아들여져 왔다. OMG의 CORBA가 객체지향 분산 아키텍쳐를 위한 실제적인 표준으로 잡음으로써, 진보된 인터넷 상거래시스템들 구축하는데 있어 CORBA를 이용하기 위한 기술을 요구한다. 본 논문에서는 CORBA 기반의 전자상거래 시스템의 아키텍쳐를 제시하며, CORBA가 인터넷 상거래 시스템의 성능과 다른 특성들을 어떻게 향상시킬 수 있는지를 제안한다.

• Journal of KIBIM
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• v.6 no.1
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• pp.9-17
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• 2016

Building information modeling refers to combination or set of technologies and organizational solutions that are expected to increase collaboration in the construction industry and to improve the productivity and quality of the design, construction, and maintenance of buildings. For enhanced communication among project participants, various information which BIM model usually includes is provided, furthermore data which contain exchange of unstructured information is needed. If the extension of BIM standard file format for practical use of design Issue information about collaborative design process is fulfilled, the productivity and quality of design will be improved.

• Journal of the Korea Society of Computer and Information
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• v.6 no.1
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• pp.51-59
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• 2001

In this paper, performance of the double circular array antenna was analyzed, which has sharp directivity with specific direction and is compatible to shape pencil beam. The character of each array geometry which N numbers of isotropic point source is arranged in planar with type of a square, circular and double circular was compared and analyzed. As a result, we fined that double circular geometry was good performance rather than square and circular array geometry in the point of directivity. SLL and HPBW.

• Proceedings of the Korean Information Science Society Conference
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• 2005.11b
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• pp.409-411
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• 2005

사용자를 지원하기 위한 고객지향 인터페이스를 설계하여 사용자가 데이터 입력시에 재사용할 수 있는 이벤트 객체의 공통성과 가변성을 연구하여 데이터를 재사용할 수 있도록 하는 방법을 연구하였다. 미래의 컴퓨터는 성능이 무한하게 성장할 것이다. 따라서 컴퓨터 성능부하 보다는 고객지향 소프트웨어를 개발하는데 초점을 맞추어야 한다. 따라서 본 연구에서는 사용자 인터페이스에서 사용자의 입력 및 업무처리를 용이하도록 지원할 수 있는 재사용 데이터 객체 유형을 4가지로 정의하고, 객체의 추출 방법과 유형별 객체의 사례를 보여주고 있다. 본 연구는 신속한 데이터의 입력과 오류를 감소시켜 주고 입력 데이터를 재사용할 수 있도록 한다.

• Journal of KIBIM
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• v.5 no.1
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• pp.35-43
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• 2015

Existing pedagogical issues of digital design including BIM have been focused not on potential of Digital Design but on skills of BIM or digital modeling tool. Kinetic facade can move or change material state to react surrounding environment conditions. It is a suitable design object for teaching principle of Performance Oriented Digital Design. Variables of movements affect multi-criteria of performances of kinetic facade, so different design approach from fixed facade design should be explored. Kinetic facade design process is proposed to study pedagogical issues of Performance Oriented Digital Design in this paper. Through Kinetic facade design process, students can understand conditions, variables, and performances of digital design.