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REFERENCE LINKING PLATFORM OF KOREA S&T JOURNALS
> Journal Vol & Issue
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 9, Issue 6 - Dec 2014
Volume 9, Issue 5 - Oct 2014
Volume 9, Issue 4 - Aug 2014
Volume 9, Issue 3 - Jun 2014
Volume 9, Issue 2 - Apr 2014
Volume 9, Issue 1 - Feb 2014
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A Weather Monitoring System for Local Area Using an Energy-balanced Hybrid WSN Protocol
Lee, Hyung-Bong ; Chung, Tae-Yun ;
IEMEK Journal of Embedded Systems and Applications, volume 9, issue 4, 2014, Pages 193~203
DOI : 10.14372/IEMEK.2014.9.4.193
This paper implements a weather monitoring system based on wireless sensor network. The wireless sensor network protocol proposed in this paper adopts a TDMA styled MAC. The protocol is designed to balance the energy consumption among sensor nodes. Other purposes of the protocol are to avoid the hidden terminal problem in 2-hop star topology, and to allow a CSMA styled communication in a given time slot to support emergent messages. Also, this paper develops the hardware of sensor node, gateway and electric generator based on solar and windy energy. The test results on the implemented system show that the time slot of each node is shifted in circular manner to balance the waiting time for transmission, and the reliability of wireless communication is over 99%.
Effect of ASLR on Memory Duplicate Ratio in Cache-based Virtual Machine Live Migration
Piao, Guangyong ; Oh, Youngsup ; Sung, Baegjae ; Park, Chanik ;
IEMEK Journal of Embedded Systems and Applications, volume 9, issue 4, 2014, Pages 205~210
DOI : 10.14372/IEMEK.2014.9.4.205
Cache based live migration method utilizes a cache, which is accessible to both side (remote and local), to reduce the virtual machine migration time, by transferring only irredundant data. However, address space layout randomization (ASLR) is proved to reduce the memory duplicate ratio between targeted migration memory and the migration cache. In this pager, we analyzed the behavior of ASLR to find out how it changes the physical memory contents of virtual machines. We found that among six virtual memory regions, only the modification to stack influences the page-level memory duplicate ratio. Experiments showed that: (1) the ASLR does not shift the heap region in sub-page level; (2) the stack reduces the duplicate page size among VMs which performed input replay around 40MB, when ASLR was enabled; (3) the size of memory pages, which can be reconstructed from the fresh booted up state, also reduces by about 60MB by ASLR. With those observations, when applying cache-based migration method, we can omit the stack region. While for other five regions, even a coarse page-level redundancy data detecting method can figure out most of the duplicate memory contents.
A Research on Effective Cyber-Physical Systems Tests Using EcoHILS
Kim, Min-Jo ; Kang, Sungjoo ; Chun, In-Geol ; Kim, Won-Tae ;
IEMEK Journal of Embedded Systems and Applications, volume 9, issue 4, 2014, Pages 211~217
DOI : 10.14372/IEMEK.2014.9.4.211
Cyber-Physical Systems(CPS) that mostly provides safety-critical and mission-critical services requires high reliability, so that system testing is an essential and important process. Hardware-In-the-Loop Simulation(HILS) is one of the extensively used techniques for testing hardware systems. However, most conventional HILS has problems that it is difficult to support a distributed operating environment and to reuse a HILS platform. In this paper, we introduce EcoHILS(ETRI CPS Open Human-Interactive hardware-in-the-Loop Simulator) in order to test CPS effectively. Moreover, feasibility tests and performance tests of EcoHILS are performed to confirm its effectiveness.
Recognition System of Slope Condition Using Image and Laser Measuring Instrument
Han, Sang-Hun ; Han, Youngjoon ;
IEMEK Journal of Embedded Systems and Applications, volume 9, issue 4, 2014, Pages 219~227
DOI : 10.14372/IEMEK.2014.9.4.219
Natural disasters such as a ground collapse and a landslide have broken out due to the climate change of the Korea and the reckless expansion of cities and roads. The climate changes and the reckless urbanization have made the ground weak. Thus, it is important to keep a close eye on the highly weakened landslide and to prevent its natural disasters. In order to prevent these disasters, this paper presents a system of recognizing the road slide condition by measuring the displacements using laser scanner instrument. The previous system of monitoring the road slide has some problems as inaccurate recognition due to using only images from a camera, or expensive system such as artificial satellites and aircraft systems. To solve this problem, our proposed system uses the 3D range data from the laser scanner for measuring the accurate displacement of the road slide and optical flows from the Lucas-Kanade algorithm for recognizing the road slide in the image.
Implementation of Distributed Health-aware Bicycle System for Making Real-time Air-pollution Map
Cho, Joongjae ; Yoo, Joonhyuk ;
IEMEK Journal of Embedded Systems and Applications, volume 9, issue 4, 2014, Pages 229~235
DOI : 10.14372/IEMEK.2014.9.4.229
This paper presents an environmental navigation system which provides a guidance to the users of smart bicycle for a pollution-free route during their travel. The smart bicycle operates as a sensor node being composed of a distributed wireless sensor network over the whole urban area. Several environmental sensors measuring the amount of dust, CO,
in the air are built into the smart bicycle to estimate the level of air pollution in the located area. Each smart bicycle sends/receives the measured sensor data and the city pollution map to/from the centralized server, which leads the bike-riders to a healthy route by providing the environmental navigation information. The proposed idea and its implementation give a useful insight on various application services with the distributed smart bicycles.
Real-Time Obstacle Avoidance of Autonomous Mobile Robot and Implementation of User Interface for Android Platform
Kim, Jun-Young ; Lee, Won-Chang ;
IEMEK Journal of Embedded Systems and Applications, volume 9, issue 4, 2014, Pages 237~243
DOI : 10.14372/IEMEK.2014.9.4.237
In this paper we present an real-time obstacle avoidance technique of autonomous mobile robot with steering system and implementation of user interface for mobile devices with Android platform. The direction of autonomous robot is determined by virtual force field concept, which is based on the distance information acquired from 5 ultrasonic sensors. It is converted to virtual repulsive force around the autonomous robot which is inversely proportional to the distance. The steering system with PD(proportional and derivative) controller moves the mobile robot to the determined target direction. We also use PSD(position sensitive detector) sensors to supplement ultrasonic sensors around dead angle area. The mobile robot communicates with Android mobile device and PC via Ethernet. The video information from CMOS camera mounted on the mobile robot is transmitted to Android mobile device and PC. And the user can control the mobile robot manually by transmitting commands on the user interface to it via Ethernet.
A Software Update Method Using Clustering WSNs
Jeong, Hyeyeong ; Ahn, Byoungchul ;
IEMEK Journal of Embedded Systems and Applications, volume 9, issue 4, 2014, Pages 245~251
DOI : 10.14372/IEMEK.2014.9.4.245
Wireless Sensor Networks(WSNs) are applied to many monitoring applications. Present sensor nodes can perform many functions at the same time and contain complex software. During the lifetime of sensor nodes, they are required to reprogram their software because of their new functions, software, software bug fixes. The nodes are inaccessible physically or it is very difficult to upgrade their software by one by one. To upgrade the software of sensor nodes in WSNs remotely, this paper presents an energy efficient method by selecting an optimal relay node. The CHR(Cluster Head Relay) method is compared with SPIN and RANDOM method. Three methods are simulated in NS-2 with the same environmental parameters. Simulation results show that CHR shows faster update time and less power consumption compared with other two methods.