• 제목/요약/키워드: Database Construction

검색결과 1,435건 처리시간 0.024초

Accuracy Improvement of Low Cost GPS/INS Integration System for Digital Photologging System

  • Kim, Byung-Guk;Kwon, Jay-Hyoun;Lee, Jong-Ki
    • Korean Journal of Geomatics
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    • 제2권2호
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    • pp.99-105
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    • 2002
  • The accuracy of the Digital Photologging System, designed for the construction of the road Facility Database, highly depends on the positions and attitudes of the cameras from GPS/INS integration. In this paper, the development of a loosely coupled GPS/INS is presented. The performance of the system is verified through a simulation as well as a real test data processing. Since the IMU used in this study shows large systematic errors, the possible accuracy of the positions and attitudes of this low-performance IMU when combined with precise GPS positions are assigned. Currently, the integrated system shows the positional accuracy better than 5cm in real data processing. Although the accuracy of attitude based on real test could not be assigned at this time, it is expected that better than 0.5 degrees and 1.8 degrees for horizontal and down component are achievable according to the simulation result.

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직류전압감쇄법을 이용한 전력케이블의 절연열화진단 (Diagnostics of Power Cables using DC Voltage Decay method)

  • 이동영;김상준;김주용;송일근
    • 대한전기학회:학술대회논문집
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    • 대한전기학회 1997년도 하계학술대회 논문집 E
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    • pp.1688-1691
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    • 1997
  • In this work, we have developed the off-line diagnostic system for power cable insulation using DC voltage decay method to diagnose the insulation degradation of underground power cables. Measurement errors of diagnostic system are less than 1% for $1T{\Omega}$ internal resistor. We have also developed measurement and diagnostic programs for win95 which is suitable for the database construction and the management of data. We could conclude that it is possible to apply this system to the multi-grounded underground cable systems.

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기초 형식 및 공법 선정을 위한 전문가 시스템 개발 (Developing An Expert System for The Selection of Foundation Types and Methods)

  • 정영식;이종석;김태헌;홍운철
    • 한국전산구조공학회:학술대회논문집
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    • 한국전산구조공학회 1998년도 가을 학술발표회 논문집
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    • pp.381-388
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    • 1998
  • This paper describes the development of an expert system designed to help engineers select proper foundation types and construction methods for structures under various subsoil conditions. The system includes geographical and geological data in certain areas of Ulsan and a knowledge base for the selection of foundation types. Geological data, such as boring logs, in the areas were collected and arranged to form the subsoil database in the areas concerned Test borings at 30 holes were carried out for reference and confirmation purposes. The use of this system is twofold. It provides the users with a quick view on the geological situations of the areas concerned, and suggests proper foundation types for the specific spot together with some explanations on the selected foundation types and methods.

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신제품 개발에 있어서 동시공학 기법적용을 위한 정보시스템 구축 (A Construction of an Integrated Information System for New Product Development by CE)

  • 박영준;안상현;김형준
    • 산업경영시스템학회지
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    • 제21권47호
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    • pp.289-302
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    • 1998
  • Concurrent Engineering(CE) can provide a competitive edge for companies that have confronted with rapidly changing market requirements, such as shortening of product life cycles, high quality, low cost, diversity of customer demand, and so on. We construct a prototype of integrated information system to support a new product development process by CE concept. This integrated information system can be useful for considering concurrently all of the aspect in the product design process. In this system, an Engineering Database is constructed for gathering data of four departments; i.e. marketing, production, quality control and design department. Also DFM(Design For Manufacturability) is applied for analysis of product design.

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철근배근상세 DB 및 도면작성 시스템 설계와 구현 (Design and Implementation of Rebar Detailing DB and System in RC Buildgings)

  • 최동인;박의동;김치경
    • 한국전산구조공학회:학술대회논문집
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    • 한국전산구조공학회 2007년도 정기 학술대회 논문집
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    • pp.763-768
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    • 2007
  • In construction of RC buildings, the quality of shop and detail drawings is very essential for the quality and safety of buildings, Nevertheless, most of thess works are left to site workers and the requirements about bar detailing such as anchorage and splice have been done without rational design and engineering. The purpose of this research is to develop a computer aided drawing system of rebars for RC buildings. The system is based on an integrated structural design system, that is SDP. SDP manages an engineering database for structural design information. It provides all the information needed to draw rebar drawings. The drawing system consists of three modules, 1) Structural Plan Drawing System, 2) Shop Drawing System, and 3) Detail Drawing System. It is expected that not only the productivity of detail drawing works but also the quality and safety of buildings will be improved using the rebar drawing system developed in this research.

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Oracle DB를 이용한 송전계통 보호 계전기 정정 Rule base구축 및 추론 (Construction of Rulebase and Its Inference Method for Protective Relay Setting Using Oracle Database)

  • 주해진;민병운;이승재;강상희;최면송;조범섭;이은희;최홍석
    • 대한전기학회:학술대회논문집
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    • 대한전기학회 2000년도 하계학술대회 논문집 A
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    • pp.119-121
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    • 2000
  • The protective relay setting of transmission systems has to consider various factors such as the protrected device, relay type and system conditions and it requires the empirical knowledge of experts. In this study. The setting rules have been accumulated in Oracle DB and its inference scheme has been devised. Their applications to relay setting system are expected to refine the setting knowledge enhancing the accuracy and consistency of the relay setting.

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시스템엔지니어링 프로세스에 의한 국방 분석평가자료 수집체계 연구 (A study of data acquisition system of defense analysis & evaluation by systems engineering process)

  • 민성기;최순황
    • 시스템엔지니어링학술지
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    • 제1권2호
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    • pp.69-76
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    • 2005
  • Defense analysis & evaluation includes menace analysis, validation analysis, problem analysis, scientific technical analysis, technical trade-off analysis, alternative analysis, cost analysis, etc. Reliable related data is required to perform these analysis activities efficiently. but in case of these defense analysis & evaluation data acquisition system, the data is insufficient and scattered about each organization. The data of database system is also not utilized sufficiently. Abroad technical data is also low level data such as catalog or military officer's collection. Therefore, this paper propose defense analysis & evaluation data acquisition system by systems engineering process. we also propose construction method of data acquisition system.

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철도차량 요구사항서 논증 활동 사례 연구 (A Case Study on the Validation of the Rolling Stock Requirement Statement)

  • 김진일;김진훈
    • 한국군사과학기술학회지
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    • 제7권2호
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    • pp.57-64
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    • 2004
  • A Requirement statement validation process is suggested which was established and applied to the rolling stock development project of the Korean Railway Research Institute. The validation process includes team organization, selection of validation criteria, development of validation template, education of team members, validation, construction of database and management of requirement change. Many defects in the specification of requirement were found to be associated with the problem of non-uniqueness, describing solution instead of problem, ambiguity and redundancy. This paper described detailed activities at each step of the validation process and lessons learned from these activities.

Optimal design using genetic algorithm with nonlinear elastic analysis

  • Kim, Seung-Eock;Song, Weon-Keun;Ma, Sang-Soo
    • Structural Engineering and Mechanics
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    • 제17권5호
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    • pp.707-725
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    • 2004
  • An optimal design method with nonlinear elastic analysis is presented. The proposed nonlinear elastic method overcomes the drawback of the conventional LRFD method that accounts for nonlinear effect by using the moment amplification factors of $B_1$ and $B_2$. The genetic algorithm used is a procedure based on Darwinian notions of survival of the fittest, where selection, crossover, and mutation operators are employed to look for high performance ones among sections in the database. They are satisfied with the constraint functions and give the lightest weight to the structure. The objective function taken is the total weight of the steel structure and the constraint functions are strength, serviceability, and ductility requirement. Case studies of a planar portal frame, a space two-story frame, and a three-dimensional steel arch bridge are presented.

ENC와 DTED 데이터를 이용한 데이터베이스 제작 개선에 대한 연구 (A Study on the Improvement of Database Construction using ENC and DTED)

  • 김원욱;김종수;홍정혁
    • 한국시뮬레이션학회논문지
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    • 제14권3호
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    • pp.13-19
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    • 2005
  • 선박조종시뮬레이터는 교육훈련생들에게 실제와 비슷한 환경을 제공하여 교육훈련의 효과를 높일 수 있는 장점을 가지고 있다. 그러므로 선박조종시뮬레이터에는 선박의 정확한 수학적 모델과 실제와 거의 동일한 3차원 화면이 필요하다. 이 연구에서는 전자해도와 고도데이터를 이용한 3차원 영상 제작법에 대해 고찰하고자 한다. 전자해도는 전 세계적으로 표준화 되어 있어 정확성이 가장 뛰어날 뿐만 아니라 수심, 항해물표 등 각종 데이터를 가지고 있어 보다 많은 정보를 선박조종시뮬레이터에 적용할 수 있는 장점을 가지고 있다. 그리고 고도데이터의 경우 그 정확성으로 기존의 해상환경 데이터베이스보다 훨씬 현실감을 준다. 전자해도 및 고도데이터를 이용하여 해상환경을 제작 시 정확한 많은 정보의 제공이 가능하며, 기존의 방법에 비해 제작시간을 상당히 감소시킬 수 있을 것으로 판단된다.

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