• 한국정밀공학회지
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• 제20권8호
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• pp.39-46
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• 2003

Productivity and machining performance can be improved by cutting analysis including cutting force prediction, surface error prediction and machining stability evaluation. In order to perform cutting analysis, cutting force coefficients database have to be constructed. Since cutting force coefficients are dependent on cutting condition in the existing research, a large number of calibration tests are needed to obtain cutting force coefficients, which makes it difficult to build the cutting force coefficients database. This paper proposes a generalized method for constructing the cutting force coefficients database us ins cutting-condition-independent coefficients. The tool geometry and workpiece material were considered as important components for database construction. Cutting force coefficients were calculated and analyzed for various helix and rake angles as well as for several workpiece. Furthermore, the variation of cutting force coefficients according to tool wear was analyzed. Tool wear was found to affect tool geometry, which results in the change of cutting force coefficients.

• Journal of Advanced Marine Engineering and Technology
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• 제34권8호
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• pp.1188-1194
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• 2010

선박에서는 수많은 장비로부터 다양한 형태의 데이터가 발생되고 있다. 이러한 데이터는 주로 선박의 안전한 운항을 위하여 실시간으로 이용되고 있지만, 이를 데이터베이스화 한다면 선박의 각종 이력정보를 검색할 수 있는 등 그 효용성이 증대될 것이다. 하지만, 이러한 데이터는 통일된 포맷이 아니라 장비의 종류에 따라 상이한 포맷을 가지기 때문에 통합된 데이터베이스의 개발이 요구되고 있다. 본 논문에서는 이러한 데이터베이스의 설계 및 구현 결과를 제시한다.

• 한국의학물리학회:학술대회논문집
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• 한국의학물리학회 1999년도 Japanese Journal of Medical Physics
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• pp.312-315
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• 1999

To improve quality and reliability of a multi-institutuonal radiation oncology database and to enhance the results of radiotherapy, we developed software which can generate another software automatically for converting an existed database to an integrated multi-institutional database ROGAD [Radiation Oncology Greater Area Database].

• 한국소음진동공학회:학술대회논문집
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• 한국소음진동공학회 2014년도 추계학술대회 논문집
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• pp.812-816
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• 2014

Recently, there is an increasing interest on railway noise and vibration. Accordingly, the importance of technology that can assess the vibration and structural noise caused due to the railway operation is increasing. Additionally, the need to construct a railway noise and vibration database which is a basic data for a reliable railway noise and vibration assessment as well is increasing. However, the problem is that the currently constructed database fails to include the factors influencing the occurrence of noise and vibration sufficiently. Therefore, In this paper, design a railway noise and vibration database that includes those factors sufficiently and which enables the continuous data management and accumulation.

• 한국건설관리학회논문집
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• 제5권4호
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• pp.79-86
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• 2004

One of the most difficult tasks in pavement management information systems is establishing the links between performance measures of a structure and the design and construction inputs. In-situ pavement performance can be considered a response variable to many project input variables, such as design, construction, and traffic loading effects. If we are to fully understand the component of pavement performance and specify the inputs through design and construction specifications to achieve that performance we must develop quantitative relationship between input and response variables through a scientific, fully integrated Pavement Performance Analysis System (PPAS). Hence, the objective of this study is to design a database model required for developing an effective database template that will allow analysis of pavement performance measures based on design and construction information linked by location. In order to select the most appropriate database model, a conceptual database model (Entity Relationship Model) and dimensional model, which is believed to be the most effective modeling technique for data warehouse project, are designed and compared. It is believed that other state highway agencies could adopt the proposed design strategy for implementing a PPAS at the discretion of the state highway agencies.

• 한국전산구조공학회:학술대회논문집
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• 한국전산구조공학회 2001년도 가을 학술발표회 논문집
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• pp.151-158
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• 2001

This paper describes an example of developing an integrated design system, Integrated Structural Design System for Reinforced Concrete Buildings(INDECON). INDECON incorporates a central database and three design modules: a preliminary design module(PDM), a structural analysis module(SAM), and a detailed design module(DDM). The development of INDECON begins with the development of design models including Design Object Model(DOM) which describes design data during the structural design process. The Design Object Model is transformed to Design Table Model(DTM) for the central database, and is specified to be in detail for the three design modules. Then the central database is implemented and managed by relational database management system(RDBMS), and the three design modules are implemented using C++ programming language. The central database in the server computer communicates with the design modules in the client computers using TCP/IP internet protocol. The developing procedure for INDECON in this paper can be applied for developing more comprehensive integrated structural design systems.

• 한국정보통신학회논문지
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• 제8권7호
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• pp.1604-1609
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• 2004

본 논문에서는 XML DTD를 관계형 데이터 베이스 스키마로 변환하기 위해 제안된 Hybrid Inlining 알고리즘을 확장하여 기존의 알고리즘이 갖고 있는 N:N 관계를 갖는 DTD의 정규화 위배 사항에 대해서 알아보고 이를 해결하기 위해 Hybrid Inlining 확장 알고리즘을 제안한다. 또한 실험을 통해 본 논문에서 제안한 알고리즘이 N:N 관계를 갖는 DTD의 정규형 위배 문제를 해결하였음을 입증하였다.

• 한국컴퓨터정보학회논문지
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• 제22권11호
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• pp.57-63
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• 2017

The recent sudden increase of big data has characteristics such as continuous generation of data, large amount, and unstructured format. The existing relational database technologies are inadequate to handle such big data due to the limited processing speed and the significant storage expansion cost. Thus, big data processing technologies, which are normally based on distributed file systems, distributed database management, and parallel processing technologies, have arisen as a core technology to implement big data repositories. In this paper, we propose a design methodology for large-scale database based on MongoDB by extending the information engineering methodology based on E-R data model.

• 전기전자학회논문지
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• 제22권4호
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• pp.948-952
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• 2018

Haze removal is an object of scientific desire due to its various practical applications. Existing algorithms are founded upon histogram equalization, contrast maximization, or the growing trend of applying machine learning in image processing. Since machine learning-based algorithms solve problems based on the data, they usually perform better than those based on traditional image processing/computer vision techniques. However, to achieve such a high performance, one of the requisites is a large and reliable training database, which seems to be unattainable owing to the complexity of real hazy and haze-free images acquisition. As a result, researchers are currently using the synthetic database, obtained by introducing the synthetic haze drawn from the standard uniform distribution into the clear images. In this paper, we propose the enhanced equidistribution, improving upon our previous study on equidistribution, and use it to make a new database for training machine learning-based haze removal algorithms. A large number of experiments verify the effectiveness of our proposed methodology.

• 한국융합학회논문지
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• 제8권8호
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• pp.59-69
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• 2017

인문 사회과학 연구원들과 데이터베이스 전문가들이 태평양문제연구회(IPR)가 작성한 IPR 자료를 데이터베이스로 구축하기 위해 함께 하였다. 본 논문은 그 데이터베이스의 구축에서 IPR 자료의 품질을 보장하기 위한 쟁점과 해결책을 제시한다. 우리는 데이터베이스의 접근성을 위해 웹에 데이터베이스를 유지하여 연구원들이 웹 브라우저로 접근할 수 있도록 하며, 데이터베이스 구축의 편리성을 위해 통합 인터페이스를 제공하여 연구원들이 그 속에서 모든 작업을 수행하게 하며, 구축한 IPR 자료의 완전성을 위해 입력된 각 IPR 자료의 책임 소재를 밝히는 책임 입력과 책임 승인을 지원하며, 승인의 즉시성을 위해 연구원들의 입력을 원활히 하는 대화형 승인 과정을 지원한다. 또한 구축한 IPR 자료의 정확성을 보장하기 위해 우리는 데이터베이스 설계, 질의 처리, 트랜잭션 관리, 검색과 정렬 기법들을 사용한다. 특히, 레코드들 간의 존재 종속관계를 이용한 동시성 제어를 통하여 운영체제 파일과 그 파일의 경로 간의 정확성을 보장한다. 향후 연구로 내용 검색, 데이터베이스의 다운로드와 업로드, IPR 자료의 저작권 관련 작업을 포함한다.