• Title/Summary/Keyword: Real-time Operating System

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Real-time Ray-tracing Chip Architecture

  • Yoon, Hyung-Min;Lee, Byoung-Ok;Cheong, Cheol-Ho;Hur, Jin-Suk;Kim, Sang-Gon;Chung, Woo-Nam;Lee, Yong-Ho;Park, Woo-Chan
    • IEIE Transactions on Smart Processing and Computing
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    • v.4 no.2
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    • pp.65-70
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    • 2015
  • In this paper, we describe the world's first real-time ray-tracing chip architecture. Ray-tracing technology generates high-quality 3D graphics images better than current rasterization technology by providing four essential light effects: shadow, reflection, refraction and transmission. The real-time ray-tracing chip named RayChip includes a real-time ray-tracing graphics processing unit and an accelerating tree-building unit. An ARM Ltd. central processing unit (CPU) and other peripherals are also included to support all processes of 3D graphics applications. Using the accelerating tree-building unit named RayTree to minimize the CPU load, the chip uses a low-end CPU and decreases both silicon area and power consumption. The evaluation results with RayChip show appropriate performance to support real-time ray tracing in high-definition (HD) resolution, while the rendered images are scaled to full HD resolution. The chip also integrates the Linux operating system and the familiar OpenGL for Embedded Systems application programming interface for easy application development.

Real-time EKF-based SOC estimation using an embedded board for Li-ion batteries (임베디드 보드를 사용한 EKF 기반 실시간 배터리 SOC 추정)

  • Lee, Hyuna;Hong, Seonri;Kang, Moses;Sin, Danbi;Beak, Jongbok
    • Journal of IKEEE
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    • v.26 no.1
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    • pp.10-18
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    • 2022
  • Accurate SOC estimation is an important indicator of battery operation strategies, and many studies have been conducted. The simulation method which was mainly used in previous studies, is difficult to conduct real-time SOC estimation like real BMS environment. Therefore, this paper aims to implement a real-time battery SOC estimation embedded system and analyze problems that can arise during the verification process. In environment consisting of two Raspberry Pi boards, SOC estimation with the EKF uses data measured by the Simscape battery model. Considering that the operating characteristics of the battery vary depend on the temperature, the results were analyzed at various ambient temperatures. It was confirmed that accurate SOC estimation was performed even when offset fault and packet loss occurred due to communication or sensing problems. This paper proposes a guide for embedded system strategies that enable real-time SOC estimation with errors within 5%.

Design of Advanced Tele-operated Control System for Unmanned Vehicle

  • Park, Jae-Hong;Son, Young-Jin;Kim, Jung-Ha
    • 제어로봇시스템학회:학술대회논문집
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    • 2005.06a
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    • pp.915-919
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    • 2005
  • It is materialized an unmanned vehicle system as a part of Intelligent Transportation System (ITS) which is a fundamental constituent for unmanned vehicle. Remote control system, monitoring system and remote operating system which are consisted of unmanned vehicle system. Network program by TCP/IP socket, and real-time control & operating controlled by servo-motors from a remote place, those are used to verify safety and stability of the unmanned vehicle system in this research. This unmanned vehicle is divided into two major sections which are an unmanned vehicle part and control station part. The server PC is installed on the unmanned vehicle and a client PC is installed at a remote place, which can control the u manned vehicle. In this research work, main theme is that we experimented and tested to check the speed and utilization of the wireless LAN communication.

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The Real-Time Control Technique Over the Environment of Windows Using Virtual Machine Driver (가상머신 드라이브를 이용한 윈도우즈 환경에서의 실시간 제어기법)

  • Chang, Sung-ouk;Lee, Jin-Kul
    • Journal of Institute of Control, Robotics and Systems
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    • v.8 no.1
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    • pp.1-4
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    • 2002
  • We studied the technique which can control the real system without additional hardware drivers using virtual machine driver operated on the windows operating system. We showed the feasibility of the proposed scheme under the error and the delay of a sampling time on the multi task processing through the load test of the experiment using graphic user interface.

A study on the visualization of the sound field by using GPGPU (GPGPU에 의한 음장의 가시화에 관한 연구)

  • Lee, Chai-Bong
    • The Journal of the Korea institute of electronic communication sciences
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    • v.5 no.5
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    • pp.421-427
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    • 2010
  • In order to visualize the transfer of sound waves, we performed real-time processing with the fast operating system of GPU, the Graphics Processing Unit. Simulation by using the method of the discrete Huygens' model was also implemented. The sound waves were visualized by varying the real-time processing, the reflecting surfaces within the two-dimensional virtual sound field, and the states of the sound source. Experimental results have shown that reflection and diffraction patterns for the sound waves were identified at the reflecting objects.

A New Optical Media API for Real-Time Recording (실시간 기록을 위한 광매체 API)

  • Lee, Min-Suk;Song, Jin-Seok;Yun, Chan-Hee
    • Journal of KIISE:Computing Practices and Letters
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    • v.13 no.2
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    • pp.75-85
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    • 2007
  • There are many embedded systems which store and play multimedia streams on optical media such as recordable cd and dvd. Some of those are PVRs, DVRs, and camcorders. In this paper we describe the design and implementation of a new, well structured, fully documented, operating system independent and open source optical media API which can be used in various applications and embedded systems. We also design an ISO-9660 compliant optical media layout, an API set and the scenario for real-time recording. To prove the usability, we develop a text application to replace well-known CD-burning software, cdrecord, and a graphic burning application. All the implementations are firstly done on Linux PC environment, and then ported to a commercial embedded system which uses pSOS as an operating system.

A Study on Development of GPS Simulation Tool Kit (GPS Simulation System 개발에 관한 연구)

  • 양원재;전승환
    • Proceedings of the Korean Institute of Navigation and Port Research Conference
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    • 1998.10b
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    • pp.65-73
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    • 1998
  • Ship's positino data obtaining method is ine of the very important factor innavigation . Nowadays, GPS(Global Positioning System) using the earth orbiting satellites are equipped and operated for the position finding. Because it provides more precise position information than other equipments and is very convenient for navigator. In this study, it is designed to develop the GPS simulator for everybody being able to proactise the GPS operating skill like as navigation planning, navigation calculating etc. And also, it can be operated with personal computer without real GPS receiver. This simulation system is based on the real GPS receiver system and built by the visual basic 5.0 program. And it displays the ship's position and navigating information and plots the ship's moving track on the screen in real time according as initial setup data-main engine's rpm, rudder angle, depature position and waypoint.

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Improvement of Handrail Slippage Characteristics Using Multi-Body Dynamic Analysis Technique (다물체 동역학 해석기술을 이용한 핸드레일의 슬립특성 개선)

  • Park, Chan-Jong
    • Transactions of the Korean Society of Mechanical Engineers A
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    • v.28 no.9
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    • pp.1422-1428
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    • 2004
  • In this paper, computer simulation model of handrail band including pulley-driving system is developed to calculate handrail slippage. This handrail simulation model is validated with test result within operating range and used to predict its slippage behavior with respect to variation of 4 different design parameters considering the applicability into the real handrail system. Based upon this parameter study, optimal condition for handrail slippage improvement is proposed without time-consuming and costly experiments of the real handrail system. And then performance improvement of handrail slippage complied with safety code is achieved after applying the optimal condition into the real handrail band system.

MDA(Model Driven Architecture) based Design for Multitasking of Heterogeneous Embedded System (이종 임베디드 시스템의 멀티태스킹을 위한 MDA(Model Driven Architecture) 기반의 설계)

  • Son, Hyun-Seung;Kim, Woo-Yeol;Kim, R. Young-Chul
    • The KIPS Transactions:PartD
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    • v.15D no.3
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    • pp.355-360
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    • 2008
  • The complicated embedded system for multi-tasking requires RTOS(real-time operating system). It uses the optimal OS and processor to each embedded system on the heterogeneous development environment. This paper is proposed to use UML profile of OS API and Processor Configuration, instead of cross-compiling for developing the heterogeneous embedded system. This reduces the development time and cost through generating the automatic source code with the profile information of each embedded system. We generate and port the code after modeling the two heterogeneous real time operating systems (brickOS and uC/OS-II) and the processors (Hitachi H8 and Intel PXA255) with our proposed profile of the heterogeneous embedded system.

A Study on the Expanded R/R Scheduling in Priority-based $\mu{C/OS-II}$ Kernel (우선순위 기반의 $\mu{C/OS-II}$ 커널에서 확장된 R/R 스케줄링 연구)

  • 김태호;김창수
    • Journal of Korea Multimedia Society
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    • v.5 no.3
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    • pp.323-330
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    • 2002
  • Recently, the existing embedded real-time operating systems(RTOSs) are being developed in terms of various modified versions in every application fields. Major characteristics and difference of these OSs lie in their distinct development of mechanisms which can be used in various environment and task-scheduling function which can control time-limited contingencies. In this paper, we design and implement round/robin scheduling algorithm based on time-sharing with equal-priority for multiple tasks which are provided preemptive and priority task allocation function in $\mu{C/OS-II}$ version 2.03. We propose the most important event-ready list structure in $\mu{C/OS-II}$; kernel, and provide the running result for multiple tasks with equal priority for the proposed structure.

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