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REFERENCE LINKING PLATFORM OF KOREA S&T JOURNALS
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IEMEK Journal of Embedded Systems and Applications
Journal Basic Information
Journal DOI :
Institute of Embedded Engineering of Korea
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Volume & Issues
Volume 8, Issue 6 - Dec 2013
Volume 8, Issue 5 - Oct 2013
Volume 8, Issue 4 - Aug 2013
Volume 8, Issue 3 - Jun 2013
Volume 8, Issue 2 - Apr 2013
Volume 8, Issue 1 - Feb 2013
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Real-Time Centralized Soft Motion Control System for High Speed and Precision Robot Control
Jung, Il-Kyun ; Kim, Jung-Hoon ;
IEMEK Journal of Embedded Systems and Applications, volume 8, issue 6, 2013, Pages 295~301
DOI : 10.14372/IEMEK.2013.8.6.295
In this paper, we propose a real-time centralized soft motion control system for high speed and precision robot control. The system engages EtherCAT as high speed industrial motion network to enable force based motion control in real-time and is composed of software-based master controller with PC and slave interface modules. Hard real-time control capacity is essential for high speed and precision robot control. To implement soft based real time control, The soft based master controller is designed using a real time kernel (RTX) and EtherCAT network, and servo processes are located in the master controller for centralized motion control. In the proposed system, slave interface modules just collect and transfer all sensor information of robot to the master controller via the EtherCAT network. It is proven by experimental results that the proposed soft motion control system has real time controllability enough to apply for various robot control systems.
A Method for Data Access Control and Key Management in Mobile Cloud Storage Services
Shin, Jaebok ; Kim, Yungu ; Park, Wooram ; Park, Chanik ;
IEMEK Journal of Embedded Systems and Applications, volume 8, issue 6, 2013, Pages 303~309
DOI : 10.14372/IEMEK.2013.8.6.303
Cloud storage services are used for efficient sharing or synchronizing of user's data across multiple mobile devices. Although cloud storages provide flexibility and scalability in storing data, security issues should be handled. Currently, typical cloud storage services offer data encryption for security purpose but we think such method is not secure enough because managing encryption keys by software and identifying users by simple ID and password are main defectives of current cloud storage services. We propose a secure data access method to cloud storage in mobile environment. Our framework supports hardware-based key management, attestation on the client software integrity, and secure key sharing across the multiple devices. We implemented our prototype using ARM TrustZone and TPM Emulator which is running on secure world of the TrustZone environment.
Packet Scheduling Algorithm Considering Maximum Delay Tolerance for HSDPA System
Hur, Soojung ; Jakhongil, Narzullaev ; Park, Yong-Wan ;
IEMEK Journal of Embedded Systems and Applications, volume 8, issue 6, 2013, Pages 311~318
DOI : 10.14372/IEMEK.2013.8.6.311
In this paper, we consider a new packet scheduling algorithm for real-time traffic in the HSDPA system that has been introduced for the WCDMA system, in order to provide high transmission rates. The objective of the design is to meet the maximum tolerable delay and consider channel assignment based on the received SIR for real-time traffic users. The proposed scheduling algorithm shows that the users are ranked by the ratios of the bits in the buffer to the residual time for transmission as priority order; then the ranked users are assigned certain number of channels based on the SIR value table. The simulation results show that the proposed algorithm can provide a lower packet drop rate, and satisfy real time quality of service (QoS) requirements.
A GUI Testing Technique Based on Activity Lifecycle for Android Applications
Baek, Tae-San ; Lee, Woo Jin ;
IEMEK Journal of Embedded Systems and Applications, volume 8, issue 6, 2013, Pages 319~327
DOI : 10.14372/IEMEK.2013.8.6.319
Most Android applications are being developed by one or a few person without professional testing team. In such a poor development environment, applications may contain severe errors which may also affect the Android platform. In order to detect these errors, the behaviors of Android activities should be identified by considering user-defined lifecycle as well as the system-defined one. This paper proposes a method to generate test scenarios based on the both of user-defined and system-defined activity lifecycle of Android GUI applications. The test scenarios are generated by a state diagram extracted from the source code and are transformed into Jython scribes by using GUI layout information for automatically performing testing.
Is the Store-and-Forward Delivery Still the Best in Ad Hoc Networks?
Park, Jiwon ; Moh, Sangman ;
IEMEK Journal of Embedded Systems and Applications, volume 8, issue 6, 2013, Pages 329~337
DOI : 10.14372/IEMEK.2013.8.6.329
In multihop routed ad hoc networks, the conventional store-and-forward delivery has been used. However, we may ask a question: "Is the store-and-forward delivery still the best?" This paper presents a pipeline-through MAC (PT-MAC) protocol for ad hoc networks, in which nodes have two 3-channel interfaces in order to use limited radio resources efficiently and improve network performance. The proposed protocol reduces end-to-end delay significantly in multihop routed transmission by exploiting a novel pipeline-through technique rather than using the conventional store-and-forward. This results in improved network performance without increasing control overhead. Our extensive performance study shows that the proposed PT-MAC shows 20-40 percent shorter end-to-end delay and 25-55 percent better goodput compared to the IEEE 802.11 DCF with two 3-channel interfaces.
Energy-Aware System Lifetime Maximization Algorithm in Multi-Hop Sensor Network
Kim, Tae-Rim ; Kim, Bum-Su ; Park, Hwa-Kyu ;
IEMEK Journal of Embedded Systems and Applications, volume 8, issue 6, 2013, Pages 339~345
DOI : 10.14372/IEMEK.2013.8.6.339
This paper addresses the system lifetime maximization algorithm in multi-hop sensor network system. A multi-hop sensor network consists of many battery-driven sensor nodes that collaborate with each other to gather, process, and communicate information using wireless communications. As sensor-driven applications become increasingly integrated into our lives, we propose a energy-aware scheme where each sensor node transmits informative data with adaptive data rate to minimize system energy consumption. We show the optimal data rate to maximize the system lifetime in terms of remaining system energy. Furthermore, the proposed algorithm experimentally shows longer system lifetime in comparison with greedy algorithm.
A Research on Designing an Autonomic Control System Towards High-Reliable Cyber-Physical Systems
Park, Jeongmin ; Kang, Sungjoo ; Chun, Ingeol ; Kim, Wontae ;
IEMEK Journal of Embedded Systems and Applications, volume 8, issue 6, 2013, Pages 347~357
DOI : 10.14372/IEMEK.2013.8.6.347
Cyber-Physical system(CPS) is characterized by collaborating computational elements controlling physical entities. In CPS, human desire to acquire useful information and control devices anytime and anywhere automatically has increased the necessity of a high reliable system. However, the physical world where CPS is deployed has management complexity and maintenance cost of 'CPS', so that it is impossible to make reliable systems. Thus, this paper presents an 'Autonomic Control System towards High-reliable Cyber-Physical Systems' that comprise 8-steps including 'fault analysis', 'fault event analysis', 'fault modeling', 'fault state interpretation', 'fault strategy decision', 'fault detection', 'diagnosis&reasoning' and 'maneuver execution'. Through these activities, we fascinate to design and implement 'Autonomic control system' than before. As a proof of the approach, we used a ISR(Intelligent Service Robot) for case study. The experimental results show that it achieves to detect a fault event for autonomic control of 'CPS'.