• Proceedings of the KIPE Conference
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• 2017.07a
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• pp.227-228
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• 2017

본 논문에서는 모듈라 ESS에 사용되는 인터리브드 DC-DC 컨버터의 평균 모델을 이용하여 제어 시스템을 설계함으로써 기존 소신호 모델 기반 제어의 동작점이 변동하는 경우 과도 응답 특성이 저하되는 단점을 개선하고자 한다. 또한, PSIM 시뮬레이션과 실험을 통해 제시된 설계방법의 우수성을 실증하고자 한다.

• Proceedings of the KIEE Conference
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• 1999.07g
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• pp.2853-2855
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• 1999

본 논문은 TS(Takagi-Sugeno) 퍼지 모델로 표현된 비선형 시스템의 최적 퍼지 제어에 관한 새로운 설계 방법론을 제시하며, 최적 TS 퍼지 제어기의 매개 변수들을 설정하는 문제가 선형 행렬 부등식 문제로 표현될 수 있음을 보인다.

• Proceedings of the Korea Multimedia Society Conference
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• 2002.05c
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• pp.64-67
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• 2002

본 논문에서는 멀티미디어 공동 작업 환경에서의 화이트보드 및 오류 제어에 대해서 기술한다. 기존 화이트보드 모델이 가지고 있던 문제점들을 해결하기 위해 화이트보드 모델은 기존 공동 작업 공간이 기능적으로 분화되어 각기 다른 도구로써 사용되었던 점을 개선하여 공동 작업 공간에 대한 단일 사용자 인터페이스를 제공한다. 화이트보드 자체를 하나의 미디어로 취급하여 여기서 발생하는 오류 및 제어에 대하여 기술한다.

• Proceedings of the Korean Information Science Society Conference
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• 2003.04d
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• pp.295-297
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• 2003

본 논문에서 홈네트워크에서 차등서비스를 이용하여 홈서버가 DiffServ 경계 라우터와 칼이 트래픽 분류와 조절 기능과 원격제어 PC의 제어하에 가정의 단말들을 제어하여 차등서비스를 제공할 수 있도록 하였다. 실시간 멀티미디어 응용들에게 차등서비스를 제공하는 홈서버 기능을 제안하고 이러한 모델을 구현하기 위한 홈서버에 내장해야 할 차등서비스 방법의 모델을 설계 및 구현하였다.

• Journal of the Korea Institute of Information Security & Cryptology
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• v.31 no.3
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• pp.401-410
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• 2021

Recently, as cyber attacks targeting industrial control systems increase, various studies are being conducted on the detection of abnormalities in industrial processes. Considering that the industrial process is deterministic and regular, It is appropriate to determine abnormality by comparing the predicted value of the detection model from which normal data is trained and the actual value. In this paper, HAI Datasets 20.07 and 21.03 are used. In addition, an ensemble model is created by combining models that have applied different time steps to Gated Recurrent Units. Then, the detection performance of the single model and the ensemble recurrent neural networks model were compared through various performance evaluation analysis, and It was confirmed that the proposed model is more suitable for abnormal detection in industrial control systems.

• Journal of the Korea Academia-Industrial cooperation Society
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• v.17 no.7
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• pp.573-584
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• 2016

The train control system is a facility to ensure model-based design and safe train operation, and its safety is the most important factor for system introduction, complexity of the design information and traceability etc. Therefore, the model-based design and safety activities regarding the way-side equipment of a train control system is also highlighted. To solve this problem, In this paper, model-based design was carried out first to develop an effective train control system, which is represented by SysML(System Modeling Language). The test scenarios that can take advantage of the design model were created to improve the train safety control system. Case studies of a model-based design of a train-centric train control system were applied to the test scenarios; the results demonstrated its usability. The improved activity over the test highlighted the safety improvement approach, and it is expected to reduce the cost and time in the conceptual design of a future development model-based train control system.

• Journal of the Korean Society for Aeronautical & Space Sciences
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• v.32 no.3
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• pp.45-50
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• 2004

The design of reaction wheel control logic is critical to achieve the spacecraft attitude stabilization and performance requirements for the successful mission. Due to various uncertainties on orbit there exist limitation to obtain the model parameters through the ground tests and to design the associated control logic. Thus, the model parameter correction using on-orbit data is essential to the control performance on orbit. This paper performs the system identification using KOMPSAT-1 telemetry data and extracts the model parameters of the reaction wheel. Moreover, the reaction wheel is remodeled and compared with the ground test results.

• Journal of Korea Society of Industrial Information Systems
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• v.10 no.4
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• pp.54-64
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• 2005

The study investigated genetic algorithms for the optimal control model of maximum height vertical jumping. The model includes forward dynamic simulations by the neural excitation-control variables. Convergence of genetic algorithms is very slow. In this paper the micro genetic algorithm(micro-GA) was used to reduce the computation time. Then a near optimal solution from micro-GA was an initial solution for VF02, which is one of well-developed and proven nonlinear programming algorithms. This approach provided the successful optimal solution for maximum-height jumping without a reasonable initial guess.

• Journal of the Institute of Electronics and Information Engineers
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• v.50 no.1
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• pp.187-195
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• 2013

In this paper, we propose a transmission power control scheme for performance improvement of VANET using STPC algorithm considering traffic-flow model. In traffic congestion, a transmission power between car and car increases the collision probability of control messages, which causes the problems to decrease the performance of VANET. The proposed scheme is evaluated by OPNet modeler 16.0 for analyzing its performance and effectiveness in terms of end-to-end delays in hops, packet success probability, and throughput. The simulation result show that the proposed scheme reduces a delay in hops and increases high packet transmission success ratio. Furthermore, a throughput under high density traffic is improved effectively.

• Journal of Internet Computing and Services
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• v.8 no.1
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• pp.99-113
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• 2007

In the rapidly changing e-business environment, organizations need to share information, process business transactions, and enhance collaborations with relevant entities by taking advantage of the various technologies. However, there are always the security issues that need to be handled in order for the e-business operations to be run efficiently. In this research, we suggest the new security authorization model for safety flexible supporting the needs of e-business (e-marketplace) in an organization. This proposed model provides the scalable of access control policy among multi-domains, and preservation of flexible authorization management in distributed system environments. For servers to take the access control policy and enforcement decisions, we also describe the feasible authorization architecture is concerned with how they might seek advice and guideline from formal access control model.