• 제목/요약/키워드: Embedded data

검색결과 2,136건 처리시간 0.022초

ARM 9 임베디드 시스템에 의한 무선 제어 및 영상 감시 로봇 구현 (Implementation of Wireless Control and Image Monitoring Robot using ARM 9 Embedded System)

  • 윤효원;한경호
    • 대한전기학회:학술대회논문집
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    • 대한전기학회 2007년도 심포지엄 논문집 정보 및 제어부문
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    • pp.166-168
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    • 2007
  • This paper is dealing with how to control of a client robot's movement for instructions from a server PC and a wireless andremote control Robot that sends the server information of images for monitoring. To implement this. 802.11x WLAN with TCP/IP socket programming is used to get the driving instructions from the server PC and control movements of the robot such as a forward, backward and directions. As well as this, ARM9 cored PAX255 embedded processor and Linux OS is used for the function transmitting BMP format of 320 ${\times}$ 240 pixel for stopped image data.

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A Tamper-Detection Scheme for BTC-Compressed Images with High-Quality Images

  • Nguyen, Thai-Son;Chang, Chin-Chen;Chung, Ting-Feng
    • KSII Transactions on Internet and Information Systems (TIIS)
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    • 제8권6호
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    • pp.2005-2021
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    • 2014
  • This paper proposes a novel image authentication scheme, aiming at tampering detection for block truncation coding (BTC) compressed image. The authentication code is generated by using the random number generator with a seed, and the size of the authentication code is based on the user's requirement, with each BTC-compressed image block being used to carry the authentication code using the data hiding method. In the proposed scheme, to obtain a high-quality embedded image, a reference table is used when the authentication code is embedded. The experimental results demonstrate that the proposed scheme achieves high-quality embedded images and guarantees the capability of tamper detection.

실시간생산정보시스템을 위한 지그비와 임베디드시스템에 관한 연구 (A Research of Zigbee & Embedded System for Real Time Production System)

  • 박주식;정영득;신현재
    • 대한안전경영과학회:학술대회논문집
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    • 대한안전경영과학회 2012년 춘계학술대회
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    • pp.561-571
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    • 2012
  • In this study, which is the basis for industrial presses to target small and medium enterprises with production information system is designed. Production information in real time on-site digitizing and transmitting data to a standard PC is to base operations. Personnel management, safety management, production management is to increase the efficiency. Therefore, at low cost is to encourage computerization within the company. These embedded systems and wireless communication module has a database management program installed in order to raise productivity and competitiveness will improve.

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매시브콘크리트에 배근된 주철근의 부착특성에 관한 해석적 연구 (An Analytical Study on the Bond-Properties of Axial Bars Embedded in Massive Concrete)

  • 장일영;이호범;이승훈;변근주
    • 한국콘크리트학회:학술대회논문집
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    • 한국콘크리트학회 1992년도 봄 학술발표회 논문집
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    • pp.143-147
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    • 1992
  • Description of the behavior of the R.C structural members fixed on massive concrete is not normally generalization of recognized configuration for regular R.C. design guidanes. This can be due to the complexity of evaluation of internal resistancy and deflection changes of the members subjected to the various external forces. On the base of axially loaded member fixed on footing, however, the estimation of deflection changes due to flexural force shear force and rotational force is to be carried out in ways of specifying the bond characteristics of axial bars embedded in massive concrete. This work is to quantify adhesion of steel-concrete, initial concrete cracking stress near bar rib, maximum bond stress and residual stress in concrete respectively. In addition to quantification of them for particulate behavior, the suggestions of multi-linear bond stress-slip diagram made in carrying out finite element analyses for adhesion failure, examining concrete cracking status and reviewing existing experimental data lead to alternatively constructed relationship between bond stress and slip for a axial bars embedded massive concrete.

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Efficient Implementation of the MQTT Protocol for Embedded Systems

  • Deschambault, Olivier;Gherbi, Abdelouahed;Legare, Christian
    • Journal of Information Processing Systems
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    • 제13권1호
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    • pp.26-39
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    • 2017
  • The need for embedded devices to be able to exchange information with each other and with data centers is essential for the advent of the Internet of Things (IoT). Several existing communication protocols are designed for small devices including the message-queue telemetry transport (MQTT) protocol or the constrained application protocol (CoAP). However, most of the existing implementations are convenient for computers or smart phones but do not consider the strict constraints and limitations with regard resource usage, portability and configuration. In this paper, we report on an industrial research and development project which focuses on the design, implementation, testing and deployment of a MQTT module. The goal of this project is to develop this module for platforms having minimal RAM, flash code memory and processing power. This software module should be fully compliant with the MQTT protocol specification, portable, and inter-operable with other software stacks. In this paper, we present our approach based on abstraction layers to the design of the MQTT module and we discuss the compliance of the implementation with the requirements set including the MISRA static analysis requirements.

Prediction of bond strength between concrete and rebar under corrosion using ANN

  • Shirkhani, Amir;Davarnia, Daniel;Azar, Bahman Farahmand
    • Computers and Concrete
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    • 제23권4호
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    • pp.273-279
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    • 2019
  • Corrosion of the rebar embedded in concrete has a fundamental role in the determination of life and durability of the concrete structures. Researches have demonstrated that artificial neural networks (ANNs) can effectively predict issues such as expected damage in concrete structures in marine environment caused by chloride penetration, the potential of steel embedded in concrete under the influence of chloride, the corrosion of the steel embedded in concrete and corrosion current density in steel reinforced concrete. In this study, data from different kind of concrete under the influence of chloride ion, are analyzed using the neural network and it is concluded that this method is able to predict the bond strength between the concrete and the steel reinforcement in mentioned condition with high reliability.

웨어러블 센서를 활용한 경량 인공신경망 기반 손동작 인식기술 (A Light-weight ANN-based Hand Motion Recognition Using a Wearable Sensor)

  • 이형규
    • 대한임베디드공학회논문지
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    • 제17권4호
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    • pp.229-237
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    • 2022
  • Motion recognition is very useful for implementing an intuitive HMI (Human-Machine Interface). In particular, hands are the body parts that can move most precisely with relatively small portion of energy. Thus hand motion has been used as an efficient communication interface with other persons or machines. In this paper, we design and implement a light-weight ANN (Artificial Neural Network)-based hand motion recognition using a state-of-the-art flex sensor. The proposed design consists of data collection from a wearable flex sensor, preprocessing filters, and a light-weight NN (Neural Network) classifier. For verifying the performance and functionality of the proposed design, we implement it on a low-end embedded device. Finally, our experiments and prototype implementation demonstrate that the accuracy of the proposed hand motion recognition achieves up to 98.7%.

LFM 기법을 이용한 플래시 메모리 스와핑 파일 시스템 설계 (A Design of a Flash Memory Swapping File System using LFM)

  • 한대만;구용완
    • 인터넷정보학회논문지
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    • 제6권4호
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    • pp.47-58
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    • 2005
  • 플래시 메모리는 NOR 형과 NAND 형의 플래시 메모리 형태로 구분 할 수 있다. NOR 형태의 플래시 메모리는 빠른 읽기 속도와 Byte I/O 형태를 지원하기 때문에 ROM BIOS 와 같은 코드저장용으로 개발되어 진다. NAND 형태의 플래시 메모리는 NOR 형태의 플래시 메모리 보다 값이 싸고 임베디드 리눅스 시스템의 대용량 처리 장치 등에서와 같이 폭 넓게 사용되고 있다. 본 논문에서는 NAND 형태의 플래시 메모리를 이용하여 시스템의 성능을 저하 시키는 Swapping을 감소시키고, 수행시간을 보장할 수 있는 플래시 메모리 Swapping 알고리즘을 제안하여, 임베디드 시스템을 기반으로 하는 파일시스템을 설계한다. 실험과 플래시 파일 시스템 구현을 통하여 임베디드 시스템에서 요구하는 NAND 형 플래시 파일 시스템의 성능을 개선한다.

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마이크로컨트롤러 환경에서 타깃 바이너리 파일 분석을 통한 최대 스택 메모리 사용량 예측 기법 (Maximum Stack Memory Usage Estimation Through Target Binary File Analysis in Microcontroller Environment)

  • 최기호;김성섭;박대진;조정훈
    • 대한임베디드공학회논문지
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    • 제12권3호
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    • pp.159-167
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    • 2017
  • Software safety is a key issue in embedded system of automotive and aviation industries. Various software testing approaches have been proposed to achieve software safety like ISO26262 Part 6 in automotive environment. In spite of one of the classic and basic approaches, stack memory is hard to estimating exactly because of uncertainty of target code generated by compiler and complex nested interrupt. In this paper, we propose an approach of analyzing the maximum stack usage statically from target binary code rather than the source code that also allows nested interrupts for determining the exact stack memory size. In our approach, determining maximum stack usage is divided into three steps: data extraction from ELF file, construction of call graph, and consideration of nested interrupt configurations for determining required stack size from the ISR (Interrupt Service Routine). Experimental results of the estimation of the maximum stack usage shows proposed approach is helpful for optimizing stack memory size and checking the stability of the program in the embedded system that especially supports nested interrupts.

HTML5를 기반으로 한 스마트 TV와 스마트 홈용 플랫폼 개발 (The Developement of Smart TV and Smart Home Platform based on HTML5)

  • 김광준;강기웅;한규철;장승진;윤찬호
    • 한국전자통신학회논문지
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    • 제9권9호
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    • pp.991-998
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    • 2014
  • 임베디드 시스템(Embedded System)은 프로세서, 메모리 장치, 각종 입출력장치와 같은 하드웨어와 그 하드웨어를 제어하기 위한 소프트웨어가 탑재되어 동작한다. 본 논문에서는 오픈 모바일 플랫폼인 안드로이드를 기반으로 하는 ARM Cortex-A8 Core를 사용한 SAMSUNG의 S5PV210 CPU를 장착한 임베디드 시스템을 개발함으로서 효율적인 산업용 제어를 가능하게 하는 MPU 모듈 및 Base 보드를 설계 제작하여 구현하였다. 안드로이드 OS기반의 리눅스 커널을 통해 안드로이드 응용 계층의 네이티브 앱과 HTML5를 적용한 온도 및 습도 센서 모니터링 응용프로그램을 구현함으로서 본 논문에서 개발한 임베디드 플랫폼 설계의 적합성 및 타당성을 검증한다.