• 한국군사과학기술학회지
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• 제3권1호
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• pp.13-25
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• 2000

A simulation model is developed to analyze the large-structure driving system and its integrated behavior in the whole weapon system. It models every component in the driving system such as mechanical and electrical characteristics, and it is programmed by simulation language in a way which strongly reflects the system's real time dynamics and reduces computation time as well. A useful parameter identification method is proposed, and it is tuned on the given physical system. The model is validated through comparing to real test, and it is applied to analysis and prediction of integrated system functions relating to the fire control system.

• Agricultural and Biosystems Engineering
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• 제4권1호
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• pp.28-33
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• 2003

Achievements in the real-time soil spectro-photometer are: an improved soil penetrator to ensure a uniform soil surface under high speed conditions, real-time collecting of underground soil reflectance, getting underground soil color images, use of a RTK-GPS, and all units are arranged for compactness. With the soil spectrophotometer, field experiments were conducted in a 0.5 ha paddy field. With the original reflectance, averaging and multiple scatter correction, Kubelka-Munk (KM) transformation as soil absorption, its 1st and 2nd derivatives were calculated. When the spectra was highly correlated with the soil parameters, stepwise regression analysis was conducted. Results include the best prediction models for moisture, soil organic matter (SOM), nitrate nitrogen (NO$_3$-N), pH and electric conductivity (EC), and soil maps obtained by block kriging analysis.

• 한국정보과학회:학술대회논문집
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• 한국정보과학회 1998년도 가을 학술발표논문집 Vol.25 No.2 (1)
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• pp.463-465
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• 1998

COncurrent Design Approach for Real-Time System(이하 COSATRS) 방법론은 Gomaa가 제안한 실시간 설계 방법론으로서 Real-Time Structured Analysis(이하 RTSA)또는 Concurrent Object-Based Real-Time Analysis(이하 COBRA)방법론을 이용하여 Control and Data Flow Diagram(이하 C&DFD)를 구성하고 이것에 병렬 태스크 구조화 지침, 정보 은닉 모듈 구조화 지침을 적용하여 Task Architecture Diagram (이하 TDA), Information Hiding Module(이하 IHM)을 구성하고 나서 이 둘을 결합하여 Software Architecture Diagram(이하 SAD)를 구성하게 된다. 본 논문에서는 CODARTS 방법론의 적용과정을 테이블을 구성하여 적용함으로써 실시간 S/W 설계 지원 시스템을 설계하였다.

• 한국산업정보학회:학술대회논문집
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• 한국산업정보학회 2003년도 추계공동학술대회
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• pp.145-156
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• 2003

This paper for real time object tracking in this treatise detect histogram analysis that is accumulation value of binary conversion density and edge information and body that move by real time use of difference Image techniques and proposed method to object tracking. Firstly, we extract edge that can reduce quantity of data keeping information about form of input image in object detection. Object is extracted by performing difference image and binarization in edge image. Area of detected object is determined by threshold value that divide sum of horizontal accumulation value about binary conversion density by value that add horizontalityㆍverticality maximum accumulation value. Object is tracked by comparing similarity with object that is detected in previous frame and present frame. As experiment result, proposed algorithm could improve the object detection speed, and could track object by real time and could track local movement.

• 한국컴퓨터그래픽스학회논문지
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• 제10권1호
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• pp.15-21
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• 2004

This paper proposes a real-time technique for simulating large rotational deformations. Modal analysis based on a linear strain tensor has been shown to be suitable for real-time simulation, but is accurate only for moderately small deformations. In the present work, we identify the rotational component of an infinitesimal deformation, and extend linear modal analysis to track that component. We then develop a procedure to integrate the small rotations occurring al the nodal points. An interesting feature of our formulation is that it can implement both position and orientation constraints in a straightforward manner. These constraints can be used to interactively manipulate the shape of a deformable solid by dragging/twisting a set of nodes, Experiments show that the proposed technique runs in real-time even for a complex model, and that it can simulate large bending and/or twisting deformations with acceptable realism.

• 한국정보교육학회:학술대회논문집
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• 한국정보교육학회 2021년도 학술논문집
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• pp.355-360
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• 2021

코로나19는 학교 교육에 커다란 변화를 가지고 왔다. 원격수업을 통해 학생들의 학습권을 보장하고자 하였으나 대면수업에 비해 원격수업이 가지는 제한점은 뚜렷했다. 그럼에도 불구하고 원격수업이라는 방식은 분리된 시공간을 고려할 수 있으며, 학습자의 개별적이고 자율적인 학습이 가능하다는 측면에서 지속적으로 발전시켜 나가야 할 학습 방법임에는 틀림없다. 이에 본 연구에서는 초등학교 단계에서 실시간 원격수업 사례를 분석하고, 이에 대한 교사 면담을 통하여 초등학교 실시간 원격수업에서의 문제를 발견하고 이를 개선하고자 하였다. 사례를 통해 살펴본 초등학교 단위차시 실시간 원격수업에서의 문제점은 첫째, 원격수업이라는 낯선 환경의 불안감으로 인해 교사 활동 비중이 높은 수업이 된다는 점, 둘째, 실시간 쌍방향 수업임에도 불구하고 학생들의 개별 활동 점검이나 원활한 피드백 제공이 불가능하다는 점이었다. 이에 대한 해결방안으로는 기본적인 수업의 단계(도입-전개-정리)을 고려할 필요가 있다는 것과 적절한 소통과 피드백 제공을 위한 수업 도구의 활용을 제시하였다.

• Journal of Mechanical Science and Technology
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• 제15권6호
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• pp.776-787
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• 2001

The turbofan engine performance analysis for a medium scale commercial aircraft was carried out and the LQR control scheme for performance optimization was studied. By using scaled component maps from well-known CF6 engine characteristics, the steady-state performance analysis result was compared with BR715-56 engine performance data. The transient performance analysis was performed with four fuel schedules. The linear simulation was done at the maximum take-off condition. The real time linear simulation was performed by interpolation of the system matrices, which used the least square method as the function of LPC rotational speed. By using linear system matrices of design point, the LQR controller which used control variables for the fuel flow and the LPC bleed air was designed.

• Earthquakes and Structures
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• 제6권4호
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• pp.375-392
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• 2014

Time history analyses have been preferred commonly in earthquake engineering area to determine earthquake performances of structures in recent years. Advances in computer technology and structural analysis have led to common usage of time history analyses. Eurocode 8 allows the use of real earthquake records as an input for linear and nonlinear time history analyses of structures. However, real earthquake records with the desired characteristics sometimes may not be found, for example depending on soil classes, in this case artificial and synthetic earthquake records can be used for seismic analyses rather than real records. Selected earthquake records should be scaled to a code design spectrum to reduce record to record variability in structural responses of considered structures. So, scaling of earthquake records is one of the most important procedures of time history analyses. In this paper, four real earthquake records are scaled to Eurocode 8 design spectrums by using SESCAP (Selection and Scaling Program) based on time domain scaling method and developed by using MATLAB, GUI software, and then scaled and real earthquake records are used for linear time history analyses of a six-storied building. This building is modeled as spatial by SAP2000 software. The objectives of this study are to put basic procedures and criteria of selecting and scaling earthquake records in a nutshell, and to compare the effects of scaled earthquake records on structural response with the effects of real earthquake records on structural response in terms of record to record variability of structural response. Seismic analysis results of building show that record to record variability of structural response caused by scaled earthquake records are fewer than ones caused by real earthquake records.

• Journal of the Korean Society for Industrial and Applied Mathematics
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• 제7권1호
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• pp.15-23
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• 2003

ATM networks provide the various kinds of service which require the different Quality of Services(QoS) such as loss and delay. By statistically multiplexing of traffics and the uncertainty and fluctuation of source traffic pattern, the congestion may occur. The leaky bucket scheme is a representative policing mechanism for preventive congestion control. In this paper, we analyze the HOL(Head-of-Line) priority leaky bucket scheme. That is, traffics are classified into real-time and nonreal-time traffic. The real-time traffic has priority over nonreal-time traffic for transmission. For proposed mechanism, we obtain the system state distribution, finally the loss probability and the mean waiting time of real-time and nonreal-time traffic. The simple numerical examples also are presented.

• 한국정보처리학회논문지
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• 제5권6호
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• pp.1522-1536
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• 1998

우리는 이 논문에서 실시간 시스템을 위한 모형화 방법을 제공한다. 이 방법은 DARTS(Design Approach for Real Time Systems)에 기초하며 훨씬 확장되었다. 기존의 DARTS 방법은 좋은 설계 가이드라인은 제공해 주지만, 구조적 분석방법을 이용하며, 명세언어를 제공하지 않는다. 그래서 본 논문에서는 객체에 기반하고 분석까지 가능한 확장된 DARTS 모형화 방법을 제공하고자 한다. 분석을 위해 수치 페트리넷(NPN)을 이용하여 시스템의 내부행위를 보여주며, 천이동기 순서제어를 위해 시제논리에 기초한 명세언어를 제공한다. 적용 예제를 통하여 제안된 방법이 잘 적용되었고 내부의 메시지 전달과정에 대한 도달성 그래프를 통하여 데드락의 존재여부를 미리 확인할 수 있어 분석이 용이하며 자연스럽게 설계와 연결된다.