• Title/Summary/Keyword: 기초모델

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The Design and Implementation Methodology of Multilevel Secure Data Model Using Object Modelling Technique (객체 모델링 기법을 이용한 다단계 보안 데이터 모델의 설계와 구현 방안)

  • 심갑식
    • Journal of the Korea Institute of Information Security & Cryptology
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    • v.8 no.3
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    • pp.49-62
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    • 1998
  • 본 논문은 객체 모델링 기법을 이용하여 다단계 보안 데이터베이스 응용에 대한 구조적 특징을 표현하기 위한 모델을 제시한다. 즉, 응용 영역에 대한 데이터와 보안 의미르 통합한다. 이는 응용 영역의 데이터에 대한 불법적 유출이나 수정을 방지하는 도구가 된다 . 개발한 도구를 기초로 한 구현 모델에서는 다단계 데이터베이스를 단일 보안등급 데이터베이스들로 분해한다. 인스턴스뿐만 아니라 스키마도 보호하며 속성값 다중 인스턴스화 기법을 이용하여 커버 스토리를 표현한다. 그리고 그 모델에서의 생성, 검색, 삭제, 그리고 갱신과 같은 연산 의미를 설명한다.

Design and Implementation of a Plan Execution Model for Android Mobile Applications (Android 모바일 응용을 위한 계획 실행 모델의 설계 및 구현)

  • Oh, Hui-Kyung;Jung, Jong-Geun;Park, Chan-Young;Kim, In-Cheol
    • Annual Conference of KIPS
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    • 2010.11a
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    • pp.502-505
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    • 2010
  • 본 논문에서는 스마트폰 환경에서 개인 사용자 편의 서비스 프로그램 개발의 기초가 되는 작업 계획 모델 및 실행 모델을 제시하고, 이 모델을 활용하여 Android 플랫폼에서 개발된 자동 작업 실행 체계인 Smart Script 시스템의 설계와 구현에 대해 소개한다.

Finite Element Analysis for Transmission Tower Behavior Characteristic by Connection Beam Stiffness (수치해석을 이용한 송전철탑 연결형 기초의 연결보 강성에 따른 거동 특성)

  • Choi, YoungHo;Kyung, DooHyun;Lee, JunHwan
    • KSCE Journal of Civil and Environmental Engineering Research
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    • v.33 no.1
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    • pp.219-227
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    • 2013
  • This study analyzed the effect of performance connected-type foundations of behavior and the connected beams according to the characteristics into soft clay transmission tower foundation. For this purpose, the finite element analysis model was built and connected to the transmission tower foundation mat and the contact area of the connection beam by the percentage change in the behavior and resistance characteristics were analyzed and finite element verification of the validity of the analytical model was conducted using connected-type transmission tower results of the model experiments constructed, and effective connected-type transmission tower basis of the behavior of connected beams were selected by analyzing the effect due to the increase of the stiffness. In addition, weak analysis by connected beam self-bending moment distribution was conducted.

Study on the Effectiveness of a Graphic Basic Design Course Based on Different Dimensions of Knowledge in a Flipped Classroom (다양한 지식 차원에 기반한 도형 기초 다자인 과정 플립클라스룸으로 효율성 연구)

  • Cheng, Qin;Pan, Yonghwan
    • Journal of the Korea Convergence Society
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    • v.11 no.11
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    • pp.103-114
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    • 2020
  • This paper's research objective is to test educational content with different dimensions of knowledge during a graphic basic design course, while also proposing teaching plans and opinions for courses in flipped classrooms as well as enhancing educational efficiency. It categorizes educational content of courses based on the dimensions of knowledge in the learning objectives of Bloom's taxonomy. 120 students are divided into four experimental groups to respectively under go flipped classroom learning by using different dimensions of knowledge involved in course content. Course pretests and post tests are used to obtain and analyze experimental data. Among this knowledge, factual and conceptual knowledge obtained during extra curricular independent learning as well as programmed and meta-cognitive knowledge obtained during in-class learning from a flipped classroom can stimulate student's learning initiative and also enhance learning efficiency. According to research results and student feedback, this paper will propose targeted categorization methods for course content and also suggest educational strategies for these courses' flipped classroom model.

Frictional Contact Model for Finite Element Analysis of Sheet-Metal Forming Processes (박판 성형 공정의 유한요소 해석을 위한 마찰접촉 모델)

  • 금영탁
    • Transactions of the Korean Society of Mechanical Engineers
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    • v.17 no.9
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    • pp.2242-2251
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    • 1993
  • The mesh-based frictional contact model has been developed which does not rely on the spatial derivatives of the tool surface. Only points on the surface are evaluated from the description. which can then be simplified because of the relaxed demands placed on it. The surface tangents, normals, and corresponding derivatives at each finite-element node are evaluated directly from the finite-element mesh, in terms of the connecting nodal positions. The advantages accrue because there is no longer a need for a smooth tool surface to assure reasonable normals and derivatives. Furthermore, it can be shown that the equilibrium equations can only be properly written with a special normal derived from the mesh itself. The validity, accuracy, computation time, and stability of mesh-based contact model were discussed with the numerical examples of rounded flat-top and rough, flat-top rounded punch forming operations. Also, the forming process of a automobile inner panel section was simulated for testing the robustness of new contact model. In the discussion, the superiority of new model was examined, comparing with tool-based contact one.

A Study on the tire structure-borne sound (타이어 구조 진동음에 관한 연구)

  • Chi, Chang-Heon
    • The Journal of the Acoustical Society of Korea
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    • v.14 no.2
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    • pp.80-91
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    • 1995
  • A theoretical models has been prepared which describes the noise generated by tire/road interaction for the tire structure-borne sound analysis. The model begin with a set of thin shell equations describing the motion of the belt of a radial ply tire, as drived by Bohm('mechanisms of the belted tire', Igeniur-Archiv, XXXV, 1966). Structural quantities required for these equations are derived from material properties of the tire. The rolling shape of a tire is computed from the steady-state limit of these equations. Vibrational response of the tire is treated by the full dependent shell equations. The force input at the tire/road interface is calculated on the basis of tread geometry and distribution of contact patch pressure. Radiation of noise is calculated by a simpson integral. Using the programs, the effect on noise of various tire design variations is computed and discussed. Trends which lead to quiet tire design are identified.

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Limit State Design of Ship Structures Based on Reliability Analysis (신뢰성 해석에 기초한 선체구조의 극한설계)

  • Joo-Sung Lee
    • Journal of the Society of Naval Architects of Korea
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    • v.29 no.4
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    • pp.173-178
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    • 1992
  • This paper is in principle concerned with the reliability analysis and its based design of midship section against the ultimate bonding strength. Bulk carriers and oil tankers over 100m length are considered for this study. Target reliability indices are derived with the results of reliability analysis of the present ship models. Reliability-based structural design code formats are proposed for use in design of midship section of bulk carriers and oil tankers. The proposed design formats have been success fully applied to re-design of midship section of the present ship types and show the reasonable results. It has been found that the proposed code formats in this paper are useful for the re-deign of midship section of such ship types.

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FE Model Updating on the Grillage Model for Plate Girder Bridge Using the Hybrid Genetic Algorithm and the Multi-objective Function (하이브리드 유전자 알고리즘과 다중목적함수를 적용한 플레이트 거더교의 격자모델에 대한 유한요소 모델개선)

  • Jung, Dae-Sung;Kim, Chul-Young
    • Journal of the Earthquake Engineering Society of Korea
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    • v.12 no.6
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    • pp.13-23
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    • 2008
  • In this study, a finite element (FE) model updating method based on the hybrid genetic algorithm (HGA) is proposed to improve the grillage FE model for plate girder bridges. HGA consists of a genetic algorithm (GA) and direct search method (DS) based on a modification of Nelder & Mead's simplex optimization method (NMS). Fitness functions based on natural frequencies, mode shapes, and static deflections making use of the measurements and analytical results are also presented to apply in the proposed method. In addition, a multi-objective function has been formulated as a linear combination of fitness functions in order to simultaneously improve both stiffness and mass. The applicability of the proposed method to girder bridge structures has been verified through a numerical example on a two-span continuous grillage FE model, as well as through an experimental test on a simply supported plate girder skew bridge. In addition, the effect of measuring error is considered as random noise, and its effect is investigated by numerical simulation. Through numerical and experimental verification, it has been proven that the proposed method is feasible and effective for FE model updating on plate girder bridges.

Characteristic of Data Distribution and Data Replication based Model of LDAP System in High Performance Grid Environments (고성능 Grid 환경에서의 LDAP 시스템의 분산모델과 복제모델의 특성)

  • 권성호;김희철
    • Journal of Korea Society of Industrial Information Systems
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    • v.9 no.1
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    • pp.77-84
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    • 2004
  • Recently, as the number of entities participating in the Grid system increased, the response time of LDAP system became inadequate. Consequently, we have to design new LDAP that suitable for high performance Grid environments. For this, researches about analysis of performance LDAP system are needed firstly. However, because researches are focused mostly on read operation optimized environments, so these result of researches are not directly applied to high performance Grid environments that write operation occupies most. In this paper, we provide overall results of analysis of performance of LDAP system with respect to number of node, query arrival rate, probability of read and so on. The analysis is based on in analytic performance model by applying the M/M/1 queuing model. Finally, based on the results, we suggest the direction for the design of high performance LDAP system and this research results can be applied as basic materials to design of GIS in high performance Grid environments as well as.

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TL 9000 Quality Management System Reguirements based on ISO 9001 : Release 2.5 and Release 3.0 (ISO 9001에 기초한 TL 9000 품질경영시스템 요건 : R 2.5 와 R 3.0)

  • 최성운
    • Proceedings of the Safety Management and Science Conference
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    • 2001.05a
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    • pp.127-136
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    • 2001
  • 본 연구는 ISO 9001:1994에 기초한 TL 9000 요건: R 2.5 추가요구사항과 문서화 영향에 대해 언급하고 6가지 LCM 모델을 제시한다. 끝으로 ISO 9001 : 2000에 기초한 TL 9000 요건 : R 3.0 추가요구사항을 R 2.5의 대비표로 소개한다.

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