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REFERENCE LINKING PLATFORM OF KOREA S&T JOURNALS
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IEMEK Journal of Embedded Systems and Applications
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Journal DOI :
Institute of Embedded Engineering of Korea
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Volume & Issues
Volume 1, Issue 2 - Dec 2006
Volume 1, Issue 1 - Jun 2006
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Dynamic Power Management Structure for Energy Harvesting Pervasive Computing System
Bae, Hyeoungho ; Kim, Dong-Sung ;
IEMEK Journal of Embedded Systems and Applications, volume 1, issue 1, 2006, Pages 1~7
In this paper, a novel power management structure for an energy harvesting pervasive system is proposed. The system considers the power state of each subsystem to assign proper power sources. The switch matrix structure utilizes each power source to reduce the peak current of the battery. The power management structure can be interfaced to an embedded system power supply without significant design change.
DCAR: Dynamic Congestion Aware Routing Protocol in Mobile Ad Hoc Networks
Kim, Young-Duk ; Lee, Sang-Heon ; Lee, Dong-Ha ;
IEMEK Journal of Embedded Systems and Applications, volume 1, issue 1, 2006, Pages 8~13
In mobile ad hoc networks, most of on demand routing protocols such as DSR and AODV do not deal with traffic load during the route discovery procedure. To achieve load balancing in networks, many protocols have been proposed. However, existing load balancing schemes do not consider the remaining available buffer size of the interface queue, which still results in buffer overflows by congestion in a certain node which has the least available buffer size in the route. To solve this problem, we propose a load balancing protocol called Dynamic Congestion Aware Routing Protocol (DCAR) which monitors the remaining buffer length of all nodes in routes and excludes a certain congested node during the route discovery procedure. We also propose two buffer threshold values to select an optimal route selection metric between the traffic load and the minimum hop count. Through simulation study, we compare DCAR with other on demand routing protocols and show that the proposed protocol is more efficient when a network is heavily loaded.
Nano Esto: An IDE for USN Application Developers
Jung, Changhee ; Woo, Duk-Kyun ; Kim, Yongsang ; Chun, Ingeol ; Lim, Chaedeok ;
IEMEK Journal of Embedded Systems and Applications, volume 1, issue 1, 2006, Pages 14~19
Integrated development environment (IDE) plays an important role in reducing the developm ent time, thereby improving software development productivity. In recent years, ubiquitous sensor networks (USNs) have become increasingly popular. However their application software is developed mostly using command-line-based tools. Such a development process is not only likely to be error-prone but also inconvenient to debug errors. This paper describes a novel IDE for USN application developers called Nano Esto that provides a single, consistent, and integrated environment for building and executing USN applications. The Nano Esto helps the developers edit and cross-compile source code and download the executable image to the program memory of sensor nodes with just a few button clicks. It also provides support for configuring an application-specific kernel, simulating a wireless sensor network, and estimating power consumption in each sensor node. Currently, Nano Esto runs on Linux as well as on Windows with the same look and feel.
Design and Implementation of the Modified Cubic Interpolator Based on Variable Parameters for Multi-Band OFDM UWB System
Kim, Sang-Dong ; Lee, Jong-Hum ; Jung, Woo-Young ; Chong, Jong-Wha ;
IEMEK Journal of Embedded Systems and Applications, volume 1, issue 1, 2006, Pages 20~23
TCP Performance Enhancement over the Wireless Networks by Using CPC and ZWSC
Lee, Myung-Sub ; Park, Young-Min ; Chang, Joo-Seok ; Park, Chang-Hyeon ;
IEMEK Journal of Embedded Systems and Applications, volume 1, issue 1, 2006, Pages 24~30
With the original Transmission Control Protocol(TCP) design, which is particularly targeted at the wired networks, a packet loss is assumed to be caused by the network congestion. In the wireless environment where the chances to lose packets due to transmission bit errors are not negligible, though, this assumption may result in unnecessary TCP performance degradation. In these days, many papers describe about wireless-TCP which has suggested how to avoid congestion control when packet loss over the wireless network. In this paper, an enhancement scheme is proposed by modifying SNOOP scheme. To enhance the original SNOOP scheme, CPC(Consecutive Packet Control) and ZWSC(Zero Window Size Control) are added. The invocation of congestion control mechanism is now minimized by knowing the cause of packet loss. We use simulation to compare the overhead and the performance of the proposed schemes, and to show that the proposed schemes improve the TCP performance compares to SNOOP by knowing the cause of packet loss at the base station.