• Title/Summary/Keyword: INTEGRATION 시뮬레이터

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A Design of Helicopter Control Law Rapid Prototyping Process Using HETLAS (HETLAS를 활용한 헬리콥터 비행제어 법칙 Rapid Prototyping 프로세스 설계)

  • Yang, Chang Deok;Jung, Ho-Che;Kim, Chang-Joo;Kim, Chong-Sup;Kim, Cheol-Ho
    • Journal of the Korean Society for Aeronautical & Space Sciences
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    • v.43 no.8
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    • pp.731-738
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    • 2015
  • The rapid prototyping process and development tool which enable the control law evaluation efficiently are needed to minimize the development cycle, cost and risk of aircraft flight control system. This paper describes a development process that integrates the designed control law into HETLAS to evaluate simulation effectively using nonlinear mathematical models. The desktop engineering simulator was developed using HETLAS for the piloted simulation evaluation of a various control modes and the procedure was developed, which quickly integrates the HETLAS into HQS(Handling Quality Simulator) and HILS(Hardware In the Loop Simulation) environments. This paper presents a rapid prototyping process using HETLAS that significantly shortens the integration process of the control law into the nonlinear math model, HETLAS, and allows the control law designs to be quickly tested in the piloted simulation and HILS environments.

A study of Modeling and Simulation for the Availability Optimization of Cloud Computing Service (클라우드 컴퓨팅 서비스의 가용성 최적화를 위한 모델링 및 시뮬레이션)

  • Jang, Eun-Young;Park, Choon-Sik
    • Journal of the Korea Society for Simulation
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    • v.20 no.1
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    • pp.1-8
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    • 2011
  • Cloud computing emerges as a new paradigm for deploying, managing and offering IT resources as a service anytime, anywhere on any devices. Cloud computing data center stores many IT resources through resource integration. So cloud computing system has to be designed by technology and policy to make effective use of IT resources. In other words, cloud vendor has to provide high quality services to all user and mitigate the dissipation of IT resources. However, vendors need to predict the performance of cloud services and the use of IT resources before releasing cloud service. For solving the problem, this research presents cloud service modeling on network environment and evaluation index for availability optimization of cloud service. We also study how to optimize an amount of requested cloud service and performance of datacenter using CloudSim toolkit.

The development of full-scope replica simulator for variable supercritical pressure once-through fossil power plants (변압 관류형 초임계압 화력발전소 전범위 시뮬레이터 개발)

  • Lee, Jung-Kun;Ahn, Yeon-Shik;Jung, Hoon;Lee, Yong-Kwan;Han, Byoung-Sung
    • Journal of Institute of Control, Robotics and Systems
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    • v.4 no.3
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    • pp.392-399
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    • 1998
  • A full-scope replica type simulator whose MCR(main control room) has the same features and operation functions as MCR of the reference power plant has been developed for a fossil power plant. This simulator was developed with the model of Poryung Fossil Power Plant #3,4 which is the standard model of the Korean fossil power plant. It is the first localized simulator for the supercritical, variable boiler pressure type fossil power plant. The simulator provides various kinds of accidents which are in normal plant operation and thus enables operators to recover or reduce possible damages. To design and develop this kind of simulator, we need to integrate high technologies such as system analysis, plant operation and system integration of mechanics, physics, computer science. CASE(Computer Aided Software Engineering) tools were used to develop the dynamic model. This simulator will greatly contribute to the improvement of the safety and efficiency of the fossil power plant by implementing operator training. In this paper, the outline of software and hardware configuration and characteristics of the simulator are described, and the results of 30%, 50%, 75%, 100% load operation test will be discussed.

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Improving TCP-Vegas Performance over Mobile Ad-hoc Networks (이동 애드혹 네트워크에서의 TCP-Vegas 성능향상 기법)

  • Bae Han-Seok;Song Jeom-Ki;Kim Dong-Kyun;Park Jung-Soo;Kim Hyoung-Jun
    • The Journal of Korean Institute of Communications and Information Sciences
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    • v.31 no.3A
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    • pp.221-231
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    • 2006
  • TCP is needed as a transport protocol to provide reliable end-to-end message delivery for MANETs in order to achieve a smooth integration with the fixed Internet. Particularly, TCP has its variants, namely TCP-Reno and TCP-Vegas. However, there has been no research work on extensive performance comparison of TCP-Reno and TCP-Vegas over AODV and OLSR. This paper is the first trial to perform the research by using ns-2 simulator. Through the extensive simulations, we found that which to select among routing protocols is more important than which to select among TCP variants, because the performance difference between TCP-Reno and TCP-Vegas over uy selected routing protocol is not so much outstanding. Particularly, TCP-Vegas relies on an accurate BaseRTT estimation in order to decide the sending rate of a TCP Sender. However, it cannot be directly applied to MANET because a route change makes the Base an used over a Previous Path obsolete. Therefore, we propose a technique for improving the performance of TCP-Vegas by considering the route change, and show the performance improvement through simulation study.

A Soft Handover Scheme Between UMTS and WLAN (UMTS와 WLAN 사이의 소프트 핸드오버 방안)

  • Seo, Won-Kyeong;Lee, Kang-Won;Cho, You-Ze
    • The Journal of Korean Institute of Communications and Information Sciences
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    • v.33 no.5B
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    • pp.268-274
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    • 2008
  • With the advances in wireless communication technologies, mobile users require to get seamless services anywhere and anytime. To relize these demands, network interworking and vertical handover are necessary between heterogeneous wireless access technologies with multi-interface mobile station. A lot of organizations are doing research on the network integration schemes based on loosely and tightly integrated architectures, and research on vertical handover schemes mainly based on Mobile IP in loosely integrated environments. But actually, the tightly integrated scheme can support more faster vertical handover because heterogeneous access networks are combined tightly. However, vertical handover schemes in tightly integrated environments are conceptually proposed without any detail signaling procedures. Therefore, this paper defines a tightly integrated architecture between UMTS and WLAN, and proposes a soft vertical handover signaling procedure. The proposed soft vertical handover scheme is evaluated by the OPNET simulator, and we confirm the proposed scheme can support seamless services.

Study on Relationship Between Spatial-Perceptual Ability and Driving-Related Situation Awareness (공간지각 능력에 따른 운전-관련 상황의 재인 및 예측에 관한 연구)

  • Bia Kim ;Jaesik Lee
    • Korean Journal of Culture and Social Issue
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    • v.11 no.4
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    • pp.83-95
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    • 2005
  • The purpose of the present study was to investigate the relationship between spatial-erceptual ability and several aspects of driving-related situation awareness(in particular, recognition and prediction). Video clips of real driving were used in both recognition and prediction tasks, and the digit calculation task during driving the simulator was required as the integration task of recognition and prediction. The results showed that the subjects of higher spatial-perceptual ability performed better in recognition task, especially in terms of sensitivity measured in d'(as signal detection theory), prediction task, and digits calculation performance than those of lower spatial-perceptual ability.

Flight Dynamics Mathematical Modeling of Quad Tilt Rotor UAM for Real-Time Simulation (쿼드 틸트 로터 UAM 실시간 비행 시뮬레이션을 위한 비행역학 수학적 모델링)

  • Hyunseo Kang;Nahyeon Roh;Do-young Kim;Min-jun Park
    • Journal of Aerospace System Engineering
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    • v.18 no.4
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    • pp.18-26
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    • 2024
  • This paper describes the results of a study on Generic Quad Tilt Rotor UAM aircraft, focusing on nonlinear mathematical modeling and the development of real-time simulation software. In this research, we designed a configuration for a Generic Quad Tilt Rotor eVTOL UAM aircraft based on NASA's UAM mission requirements. We modeled the aerodynamics using a database, the prop-rotor dynamics with a thrust database, and included a ground reaction and atmospheric model in the flight model. We defined the control concept for various modes(helicopter mode, transition mode, and airplane mode), derived tilt angle corridors, and formulated flight control requirements. The resultant real-time flight simulation software not only performs trim analysis for Tilt Rotor UAM aircraft but also predicts handling qualities, optimizes tilt angle scheduling based on dynamic characteristics, designs and validates flight control laws for helicopter, transition, and airplane modes, and facilitates flight training through simulator integration.

S-FDS : a Smart Fire Detection System based on the Integration of Fuzzy Logic and Deep Learning (S-FDS : 퍼지로직과 딥러닝 통합 기반의 스마트 화재감지 시스템)

  • Jang, Jun-Yeong;Lee, Kang-Woon;Kim, Young-Jin;Kim, Won-Tae
    • Journal of the Institute of Electronics and Information Engineers
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    • v.54 no.4
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    • pp.50-58
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    • 2017
  • Recently, some methods of converging heterogeneous fire sensor data have been proposed for effective fire detection, but the rule-based methods have low adaptability and accuracy, and the fuzzy inference methods suffer from detection speed and accuracy by lack of consideration for images. In addition, a few image-based deep learning methods were researched, but it was too difficult to rapidly recognize the fire event in absence of cameras or out of scope of a camera in practical situations. In this paper, we propose a novel fire detection system combining a deep learning algorithm based on CNN and fuzzy inference engine based on heterogeneous fire sensor data including temperature, humidity, gas, and smoke density. we show it is possible for the proposed system to rapidly detect fire by utilizing images and to decide fire in a reliable way by utilizing multi-sensor data. Also, we apply distributed computing architecture to fire detection algorithm in order to avoid concentration of computing power on a server and to enhance scalability as a result. Finally, we prove the performance of the system through two experiments by means of NIST's fire dynamics simulator in both cases of an explosively spreading fire and a gradually growing fire.

Interface trap density distribution in 3D sequential Integrated-Circuit and Its effect (3차원 순차적 집적회로에서 계면 포획 전하 밀도 분포와 그 영향)

  • Ahn, TaeJun;Lee, Si Hyun;Yu, YunSeop
    • Journal of the Korea Institute of Information and Communication Engineering
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    • v.19 no.12
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    • pp.2899-2904
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    • 2015
  • This paper introduces about the effect on $I_{DS}-V_{GS}$ characteristic of transistor that interface trap charge is created by damage due to heat in a 3D sequential inverter. A interface trap charge distribution in oxide layer in a 3D sequential inverter is extracted using two-dimensional device simulator. The variation of threshold voltage of top transistor according to the gate voltage variation of bottom transistor is also described in terms of Inter Layer Dielectric (ILD) length of 3D sequential inverter, considering the extracted interface trap charge distribution. The extracted interface trap density distribution shows that the bottom $HfO_2$ layer and both the bottom and top $SiO_2$ layer were relatively more affected by heat than the top $HfO_2$ layer with latest process. The threshold voltage variations of the shorter length of ILD in 3D sequential inverter under 50nm is higher than those over 50nm. The $V_{th}$ variation considering the interface trap charge distribution changes less than that excluding it.

Degradation of a nano-thick Au/Pt bilayered catalytic layer with an electrolyte in dye sensitized solar cells (염료감응태양전지의 Au/Pt 이중 촉매층의 전해질과의 반응에 따른 열화)

  • Noh, Yunyoung;Song, Ohsung
    • Journal of the Korea Academia-Industrial cooperation Society
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    • v.15 no.6
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    • pp.4013-4018
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    • 2014
  • A 0.45 $cm^2$ DSSC device with a glass/FTO/blocking layer/$TiO_2$/N719(dye)/electrolyte/50 nm-Pt/50 nm-Au/FTO/glass was prepared to examine the stability of the Au/Pt bilayered counter electrode (CE) with electrolyte and the energy conversion efficiency (ECE) of dye-sensitized solar cells (DSSCs). For comparison, a 100 nm-thick Pt only CE DSSC was also prepared using the same method. The photovoltaic properties, such as the short circuit current density ($J_{sc}$), open circuit voltage ($V_{oc}$), fill factor (FF), and ECE, were checked using a solar simulator and potentiostat with time after assembling the DSSC. The microstructure of the Au/Pt bilayer was examined by optical microscopy after 0~25 minutes. The ECE of the Pt only CE-employed DSSC was 4.60 %, which did not show time dependence. On the other hand, for the Au/Pt CE DSSC, the ECEs after 0, 5 and 15 minutes were 5.28 %, 3.64 % and 2.09 %, respectively. The corrosion areas of the Au/Pt CE determined by optical microscopy after 0, 5, and 25 minutes were 0, 21.92 and 34.06 %. These results confirmed that the ECE and catalytic activity of Au/Pt CE decreased drastically with time. Therefore, a Au/Pt CE-employed DSSC may be superior to the Pt only CE-employed one immediately after integration of the device, but it would degrade drastically with time.