• Title/Summary/Keyword: Real-time Response

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Implementation of Profibus-FMS Network for Real-Time Closed-Loop Control System (실시간 폐루프 제어 시스템을 위한 Profibus-FMS 네트워크의 구현)

  • Lee, Kyung-Chang;Kim, Kee-Woong;Kim, Hee-Hyun;Lee, Suk
    • Journal of Institute of Control, Robotics and Systems
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    • v.6 no.10
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    • pp.911-917
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    • 2000
  • As many sensors and actuators are used in various automated systems, the application of network to real-time distributed control system is gaining acceptance in many industries. In order to take advantages of networking, however, the network should be carefully designed to satisfy real-time distributed control. This paper presents an implementation method of closed-loop control using Profibus-FMS. In order to implement a closed-loop control system, we used industrial computers with Profibus-FMS network cards and a DC servo motor. Through various experiments, the step response of the control system with network was compared with the reference response without network.

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Quality Adaptation of Intra-only Coded Video Transmission over Wireless Networks

  • Shu Tang;Yuanhong Deng;Peng Yang
    • Journal of Information Processing Systems
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    • v.19 no.6
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    • pp.817-829
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    • 2023
  • Variable wireless channel is a big challenge for real-time video applications, and the rate adaptation of realtime video streaming becomes a hot topic. Intra-video coding is important for high-quality video communication and industrial video applications. In this paper, we proposed a novel adaptive scheme for real-time video transmission with intra-only coding over a wireless network. The key idea of this scheme is to estimate the instantaneous remaining capacity of the network to adjust the quality of the next several video frames, which not only can keep low queuing delay and ensure video quality, but also can respond to bandwidth changes quickly. We compare our scheme with three different schemes in the video transmission system. The experimental results show that our scheme has higher bandwidth utilization and faster bandwidth change response, while maintaining low queuing delay.

Correlation between Real-Time and Off-Time Subjective Assessments and Physiological Responses for Visual Picture Stimulus (시각자극에 대한 실시간 및 비 실시간 주관적 평가와 생리반응과의 상관관계)

  • Jeong, Sun-Cheol;Min, Byeong-Chan;Min, Byeong-Un;Kim, Sang-Gyun;O, Ji-Yeong;Kim, Yu-Na;Kim, Cheol-Jung;Park, Se-Jin
    • Journal of the Ergonomics Society of Korea
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    • v.18 no.3
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    • pp.27-39
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    • 1999
  • The purpose of this study was to approve the capability of human sensibility evaluation based on physiological responses and real-time subjective assessments. Three well-trained healthy human subjects were participated in the experiments. We measured physiological responses such as Heart Rate Variability(HRV), Galvanic Skin Response(GSR) and skin temperature under rest and visual stimulation conditions, respectively. Off-time subjective assessments were recorded before and after visual stimulations. Real-time subjective assessments were recorded during visual stimulations. The results of physiological responses and off-time and real-time subjective assessments were quantified and compared. The results showed that the correlation between physiological responses and real-time subjective assessments was high (83%) for both the positive and negative visual stimulation. The correlation between the physiological responses and off-time subjective assessments was high (83%) for the negative visual stimulation but was low (15%) for the positive visual stimulation. Although the current observation is preliminary and requires more careful experimental study, it appears that the correlation between real-time subjective assessment and physiological responses is higher than that of the off-time subjective assessment and physiological responses.

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Extension of Real Time Execution in MMS Implementation

  • Kim, Dong-Sung;Lee, Jae-Min;Kim, Hyung-Suk;Kwon, Wook-Hyun
    • 제어로봇시스템학회:학술대회논문집
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    • 1999.10a
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    • pp.69-72
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    • 1999
  • In this paper, the implementation method for the extending real-time execution in MMS Implementation is proposed. For this, the method of MMS over ATM(Asynchronous Transfer Mode) and IEEE 802.12 network is analyzed. By the analysis of service response time, making the ASIC of encoding and decoding parts are proposed for one of the real time extension in MMS. The main goals of this paper to analyze and propose suitable methods to meet the real time requirements in MMS applied system.

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Minimizing Data Frame in CAN Controller Area Network for Humanoid Robot (CAN 기반 휴머노이드 로봇에서의 데이터 프레임 최소화)

  • Kwon, Sun-Ku;Huh, Uk-Youl;Kim, Jin-Geol
    • Proceedings of the KIEE Conference
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    • 2005.07d
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    • pp.2806-2808
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    • 2005
  • The Controller Area Network (CAN) is being widely used for real-time control application and small-scale distributed computer controller systems. When the stuff bits are generated by bit-stuffing mechanism in the CAN network, it causes jitter including variations in response time and delay. In order to eliminate this jitter, stuff bit must be controlled to minimize the response time and reduce the variation of data transmission time. At first, this paper shows that conventional CAN protocol causes the transmission time delay. Secondly, this paper proposes the method to reduce the stuff bits by restriction of available identifier. Finally, data manipulation method can be reduced the number of stuff-bits in the data field. The proposed restriction method of ID and manipulating data field are pretty useful to the real-time control strategy with respect to performance. These procedures are implemented in local controllers of the ISHURO (Inha Semyung Humanoid Robot).

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DC Motor Drive System Using Model Based Cotroller Design of LabVIEW and Compact RIO (LabVIEW의 모델기반 제어기 설계와 Compact RIO를 이용한 직류전동기 구동 시스템)

  • Ji, Jun-Keun
    • Journal of the Korea Academia-Industrial cooperation Society
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    • v.9 no.2
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    • pp.352-359
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    • 2008
  • This paper presents a controller implementation using model based controller design programs-System Identification Toolkit, Control Design Toolkit, Simulation module. This method is easier and simpler than conventional controller design method. To implement speed control system of DC motor, a CompactRIO, Real-Time(RT) cntroller provided by NI(National Instruments), is used as hardware equipment. Firstly transfer function of DC motor drive system, which was a control target plant, can be acquired through System Identification Toolkit by using test input signal applied to motor and output signal from motor. And designing of pole-zero compensator satisfying desired control response performance through Control Design Toolkit, designed speed control response can be tested through Simulation Module. Finally LabVIEW program is converted to real-time program and downloaded to CompactRIO real-time controller Through experimental results to real DC motor drive system, designed speed control response is compared to simulation results.

REAL-TIME COLLISION RESPONSE BETWEEN CLOTH AND SPHERE OBJECT IN UNITY (유니티 게임 엔진에서의 구형 물체와 천 시뮬레이션간의 실시간 충돌 및 반응 처리 연구)

  • Kim, Min Sang;Song, Wook;Choi, Yoo-Joo;Hong, Min
    • Journal of Internet Computing and Services
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    • v.19 no.6
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    • pp.53-62
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    • 2018
  • As the performance of computer hardware has been increased in recent years, more realistic computer generated objects can be created and presented in personal computers and portable digital devices as well. For this reason, digital contents, including computer graphics, require virtual objects that are more realistic and representable in real-time on various devices, thus it requires more computational costs. In order to support the production of contents including computer graphics, games, and animations on multi-platform, Unity or unreal engines are mainly used. To represent more realistic behavior of virtual objects in a simulation, a virtual object must collide with other virtual objects and present the plausible interaction, as in the real world. However, such dynamic simulation requires a large amount of computational cost, and most portable devices cannot provide these dynamic simulations in real-time. In this paper, we proposed a GPGPU computation based dynamic cloth simulation to represent collision and response with spherical object in real-time. We believe that the proposed method can be useful for readily producing realistic digital contents.

Performance Evaluation of Controlling Seismic Responses of a Building Structure with a Tuned Liquid Column Damper using the Real-Time Hybrid Testing Method (실시간 하이브리드 실험법을 이용한 동조액체기둥감쇠기가 설치된 구조물의 지진응답 제어성능 평가)

  • Chung, Hee-San;Lee, Sung-Kyung;Park, Eun-Churn;Min, Kyung-Won
    • Proceedings of the Korean Society for Noise and Vibration Engineering Conference
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    • 2007.11a
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    • pp.669-673
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    • 2007
  • In this study, real-time hybrid test using a shaking table for the control performance evaluation of a U-shaped TLCD controlling the response of earthquake-excited building structure is experimentally implemented. In the test, the building structure is used as a numerical part, on which a U-shaped TLCD adopted as an experimental part was installed to reduceits response. At first, the force that is acting between a TLCD and building structure is measured from the load cell attached on shaking table and is fed-back to the computer to control the motion of shaking table. Then, the shaking table is so driven that the error between the interface acceleration computed from the numerical building structure with the excitations of earthquake and the fed-back interface force and that measured from the shaking table. The control efficiency of the TLCD used in this paper is experimentally confirmed by implementing this process of shaking table experiment on real-time.

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Assessment of Mobile Technology Operability Based on RFID and QR Code for Real Time Information Management of Irrigation Facilities (수리시설물의 실시간 정보관리를 위한 RFID 및 QR 코드 기반의 모바일 기술 운용성 평가)

  • Kim, Tae-Gon;Nam, Won-Ho;Lee, Tae-Seok;Choi, Jin-Yong;Kim, Jin-Taek
    • Journal of The Korean Society of Agricultural Engineers
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    • v.54 no.1
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    • pp.1-9
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    • 2012
  • This study aims to assess the mobile information technology as an alternative means for managing information of irrigation facilities. Traditional irrigation facility management which is operated manually has faced to critical limitations, such as delayed and loss in data handling and facilities misidentification. Real time download, collection, and update the information about the irrigation structure conditions in terms of operation and maintenance can provide a better support of the management efforts. Thus this study suggested mobile information technology using RFID (Radio Frequency IDentification) and QR (Quick Response) code for real time information management of irrigation facilities. This paper describes the applications and implementation results of real-time mobile technology for the field information communication of the irrigation facilities. The system was tested in I-dong irrigation districts in Gyounggi-province, Korea and the assessment of operability demonstrated beneficial usability for inspection of agricultural irrigation facilities in the irrigation district. The tests showed that RFID was preferred method expected to improve operability although these had some limitation. The mobile technologies are expected to increase efficiency and effectiveness of irrigation facilities management.

A Real-Time Demand Response Management Using Smart Box (스마트 박스를 활용한 실시간 수요관리)

  • Ko, Dong-Kwan;Bea, Jun-Cheol;Min, Kyoung-Chon;Lee, Jae-Kyu
    • Transactions of the KSME C: Technology and Education
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    • v.4 no.1
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    • pp.57-62
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    • 2016
  • The Demand Response Market is a nation-wide power and energy management program of electric power demand response operated by KPX (Korea Power eXchange). Therefore, any savings could be determined by KEPCO's AMR(Automatic Meter Reading) data. However, the customers and the service providers participating in the market could not know the real time value due to the 15 minute or even more delayed AMR data communicated. Here, a new concept of a smart box has been introduced and demonstrated to provide the real time saving values compared to the current KEPCO's AMR data approach.