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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
Editor in Chief :
Volume & Issues
Volume 10, Issue 6 - Dec 2015
Volume 10, Issue 5 - Oct 2015
Volume 10, Issue 4 - Aug 2015
Volume 10, Issue 3 - Jun 2015
Volume 10, Issue 2 - Apr 2015
Volume 10, Issue 1 - Feb 2015
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Design and Implementation of CoAP based Cloud-IoT Architecture
Park, Young-Ki ; Yang, Hyun-Sik ; Kim, Young-Han ;
IEMEK Journal of Embedded Systems and Applications, volume 10, issue 3, 2015, Pages 119~127
DOI : 10.14372/IEMEK.2015.10.3.119
In the IoT(Internet of Things) environment, methods that user can access sensor node directly to collect sensing data or manage sensor in a gateway have a limitations. To solve this problem, cloud based sensor network architectures are proposed. In this paper, we proposed CoAP based IoT architecture that a lightweight gateway is used for data gathering instead of using a heavy traditional one and users can request sensing data through IoT applications running in the cloud environment and analyze signaling message cost. By doing so, our system can reduce message cost compared to the traditional gateway based system.
Design and Implementation of IoT Collaboration Module Supporting User Context Management
Kum, Seung Woo ; Lim, Tae Beom ; Park, Jong Il ;
IEMEK Journal of Embedded Systems and Applications, volume 10, issue 3, 2015, Pages 129~137
DOI : 10.14372/IEMEK.2015.10.3.129
Various personalized services are provided based on user context these days, and IoT(Internet of Things) devices provides effective ways to collect user context. For example, user's activity such as walking steps, calories, and sleeping hours can be collected using smart activity tracker. Smart scale can sense change of user's weight or body fat percentage. However, these services are independent to each other and not easy to make them collaborate. Many standard bodies are working on the documents for this issue, but due to diversity of IoT use case scenarios, it seems that multiple IoT technologies co-exist for the time being. This paper propose a framework to collaborate heterogeneous IoT services. The proposed framework provides methods to build application for heterogeneous IoT devices and user context management in more intuitive way using HTTP. To improve compatibility and usability, gathered user contexts are based on MPEG-UD. Implementation of framework and service with real-world devices are also presented.
A Virtual File System for IoT Service Platform Based on Linux FUSE
Lee, Hyung-Bong ; Chung, Tae-Yun ;
IEMEK Journal of Embedded Systems and Applications, volume 10, issue 3, 2015, Pages 139~150
DOI : 10.14372/IEMEK.2015.10.3.139
The major components of IoT(Internet of Things) environment are IoT devices rather than the conventional desktop computers. One of the intrinsic characteristics of IoT devices is diversity in view of data type and data access method. In addition, IoT devices usually deal with real-time data. In order to use such IoT data for internal business or cloud services, an IoT platform capable of easy domain management and consistent data access interface is required. This paper proposes a Linux FUSE-based virtual file system connecting IoT devices on POSIX file system view. It is possible to manage IoT domain with the native Linux utilities such as mkdir, mknod, ls and find in the file system. Also, the file system makes it possible to access or control IoT devices through POSIX interface such as open(), read(), write() or close() without any separate APIs or utilities. A test result shows that the management performance of the file system is lower than that of linux file system negligibly.
New Embedded Memory System for IoT
Lee, Jung-Hoon ;
IEMEK Journal of Embedded Systems and Applications, volume 10, issue 3, 2015, Pages 151~156
DOI : 10.14372/IEMEK.2015.10.3.151
Recently, an embedded flash memory has been widely used for the Internet of Things(IoT). Due to its nonvolatility, economical feasibility, stability, low power usage, and fast speed. With respect to power consumption, the embedded memory system must consider the most significant design factor. The objective of this research is to design high performance and low power NAND flash memory architecture including a dual buffer as a replacement for NOR flash. Simulation shows that the proposed NAND flash system can achieve better performance than a conventional NOR flash memory. Furthermore, the average memory access time of the proposed system is better that of other buffer systems with three times more space. The use of a small buffer results in a significant reduction in power consumption.
A Walking Aid System for Blind People by Exploiting a Haptic Feedback Equipment
Min, Seonghee ; Jung, Yunjae ; Oh, Yoosoo ;
IEMEK Journal of Embedded Systems and Applications, volume 10, issue 3, 2015, Pages 157~164
DOI : 10.14372/IEMEK.2015.10.3.157
In this paper we propose a walking aid system for blind people by exploiting a haptic feedback equipment. The proposed system is a form of haptic feedback cane which is composed of MCU, communication module, sensing module and actuator. The proposed system recognizes obstacles around the blind by using ultrasonic sensors in the sensing module. Moreover, the system generates feedback information about the detected obstacle and then notifies the information to the blind through the actuator. The blind can notice the direction of the detected obstacle with the haptic feedback equipment and vibration motor. Futhermore, the proposed system controls a nearby IoT(Internet of Things) system by utilizing push buttons through the ZigBee communication. Finally, the blind can easily decide the direction of the obstacle without interference of terrain feature by using the proposed system.
A Restructuring Method for Search Results of SNOMED CT Browser
Ryu, Wooseok ;
IEMEK Journal of Embedded Systems and Applications, volume 10, issue 3, 2015, Pages 165~170
DOI : 10.14372/IEMEK.2015.10.3.165
SNOMED CT browser is a browsing tool for searching clinical terms in SNOMED CT which is a standard terminology set used worldwide. The search result view of previous browsers merely list up candidate terminologies. The problem is that most of users become confused about how to select an appropriate term from the list. This leads serious waste of medical recoding cost. This paper discusses characteristics of SNOMED CT dataset and proposes a novel design of enhanced result view by restructuring the results using relationships of SNOMED CT concepts. Using the proposed scheme, medical doctors or officers can select appropriate terms more efficiently and can reduce overall recording time.
Performance Analysis of Flash File System for the Efficient I/O on Smart Device
Chung, Kyung-Ho ; Kim, Yong-Hwan ; Kim, Sang-Jin ; Jung, Young-Seok ; Kim, Sung-Soo ;
IEMEK Journal of Embedded Systems and Applications, volume 10, issue 3, 2015, Pages 171~178
DOI : 10.14372/IEMEK.2015.10.3.171
Recently NAND flash memory has been found to be the primary cause of low performance in the smart device. NAND flash memory is different from each other the execution time of I/O operations that flash file system is required. Therefore, it is necessary to compare and analyze the flash file system I/O performance for the efficient I/O on smart device. In this paper, it was tested and analyzing the I/O performance of the YAFFS2, JFFS2, UBIFS. Experimental results most read I/O performance is good, but the writing I/O performance is not good. For UBIFS, showed a more good I/O performance compared to other flash file system.
Obstacle Classification Method Based on Single 2D LIDAR Database
Lee, Moohyun ; Hur, Soojung ; Park, Yongwan ;
IEMEK Journal of Embedded Systems and Applications, volume 10, issue 3, 2015, Pages 179~188
DOI : 10.14372/IEMEK.2015.10.3.179
We propose obstacle classification method based on 2D LIDAR(Light Detecting and Ranging) database. The existing obstacle classification method based on 2D LIDAR, has an advantage in terms of accuracy and shorter calculation time. However, it was difficult to classifier the type of obstacle and therefore accurate path planning was not possible. In order to overcome this problem, a method of classifying obstacle type based on width data of obstacle was proposed. However, width data was not sufficient to improve accuracy. In this paper, database was established by width, intensity, variance of range, variance of intensity data. The first classification was processed by the width data, and the second classification was processed by the intensity data, and the third classification was processed by the variance of range, intensity data. The classification was processed by comparing to database, and the result of obstacle classification was determined by finding the one with highest similarity values. An experiment using an actual autonomous vehicle under real environment shows that calculation time declined in comparison to 3D LIDAR and it was possible to classify obstacle using single 2D LIDAR.