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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
Editor in Chief :
Volume & Issues
Volume 4, Issue 4 - Dec 2009
Volume 4, Issue 3 - Sep 2009
Volume 4, Issue 2 - Jun 2009
Volume 4, Issue 1 - Mar 2009
Selecting the target year
A Design of 24-bit Floating Point MAC Unit for Transformation of 3D Graphics
Lee, Jungwoo ; Kim, Woojin ; Kim, Kichul ;
IEMEK Journal of Embedded Systems and Applications, volume 4, issue 1, 2009, Pages 1~8
This paper proposes a 24-bit floating point multiply and accumulate(MAC) unit that can be used in geometry transformation process in 3D graphics. The MAC unit is composed of floating point multiplier and floating point accumulator. When separate multiplier and accumulator are used, matrix calculation, used in the transformation process, can't use continuous accumulation values. In the proposed MAC unit the accumulator can get continuous input from the multiplier and the calculation time is reduced. The MAC unit uses about 4,300 gates and can be operated at 150 MHz frequency.
Network Based Robot Soccer System
Cho, Dong Kwon ; Chung, Sang Bong ; Sung, Young Whee ;
IEMEK Journal of Embedded Systems and Applications, volume 4, issue 1, 2009, Pages 9~15
In this paper, a network based robot soccer system is proposed. The system consists of robots, an image processing sub-system, a game server, and client systems. Embedded technique is applied to the hardware and software for controlling the robots and image processing. In this robot soccer system, a gamer can see and control robots in a remote site through Internet. During the game, the game server gives geometrical information on robots such as positions and orientations. We demonstrated the game in public and obtained optimistic results even though some technical problemssuch as communication delay and precise control for the robots should be improved.
IEEE 802.15.4a IR-UWB System Design for Indoor Ranging and Communications
Oh, Mi-Kyung ; Park, Joo-Ho ; Oh, Jung-Yeol ; Kil, Min-Su ; Kim, Jae-Young ;
IEMEK Journal of Embedded Systems and Applications, volume 4, issue 1, 2009, Pages 16~22
This paper aims at designing an impulse-radio ultra-wideband (IR-UWB) transceiver, especially targeting the IEEE 802.15.4a indoor ranging and communication systems. We first investigate the IEEE 802.15.4a IR-UWB signals and suggest the full-digital transceiver architecture accordingly. Since the wireless systems equipped with the impulse signal have the property of low-duty cycle, i.e., discontinuity in time, while the conventional systems takes the continuous signals, it is required to reconfigure the system design, including link budget. Following brief introduction to our IEEE 802.15.4a IR-UWB system hardware, we finally examine the ranging performance in indoor environments to verify our system design.
Effective Techniques for Diagnosis and Test of Hard-to-Detect Faults in Analog Circuits
Lee, Jae-Min ;
IEMEK Journal of Embedded Systems and Applications, volume 4, issue 1, 2009, Pages 23~28
Testing of analog(and mixed-signal) circuits has been a difficult task for test engineers and effective test techniques to solve these problems are required. This paper develops a new technique which increases fault detection and diagnosis rates for analog circuits by using extended MTSS (Modified Time Slot Specification) technique based on MTSS proposed by the author. High performance current sensors with digital outputs are used as core components for these techniques. A fault diagnosis structure with minimal hardware overhead in ATE is also described.
RF Transceiver Design for Impulse Radio UWB System
Park, Joo-Ho ; Oh, Mi-Kyung ; Oh, Jung-Yeol ; Kil, Min-Su ; Kim, Jae-Young ;
IEMEK Journal of Embedded Systems and Applications, volume 4, issue 1, 2009, Pages 29~34
In this paper, we design RF transceiver architecture and building blocks for impulse radio UWB system. Impulse radio UWB signal occupies the wide frequency band which is very low transmission power. So, it can minimize the interference effect with the other system. Using UWB technology, we obtain position awareness service. Therefore, we describe the RF transceiver architecture of direct conversion receiver and define the requirement of RF transceiver. Moreover, we implement a prototype RF transceiver based on the presented standard and verify a function and performance through the wireless data communication and ranging test.
ROI Scalability method based on H.264/SVC
Lee, Jung-Hwan ; Yoo, Chuck ;
IEMEK Journal of Embedded Systems and Applications, volume 4, issue 1, 2009, Pages 35~41
The H.264/SVC enables network-adaptive video transmission to smart device which uses wireless network. But, quality scalability of H.264/SVC does not consider personal subjective image quality. In addition, its network efficiency also does not optimized because it uses MGS(Medium Grained Scalability) and CGS(Coarse Grained Scalability). Thus, this paper proposed a new scalable ROI algorithm for not only subjective image quality improvement but also network adaptation. To experiment our proposed a scheme, we added designed algorithm to JSVM(Joint Scalable Video Model) open source video codec of H.264/SVC. Experiment was performed according to the pre-defined scenario for simulating various network conditions. Finally, experimental result showed our proposed scalable ROI scheme. It is better than traditional non-selective scheme in subjective video quality.
Broadcasting Message Reduction Methods in VANET
Makhmadiyarov, Davron ; Hur, Soojung ; Park, Yongwan ;
IEMEK Journal of Embedded Systems and Applications, volume 4, issue 1, 2009, Pages 42~49
Most Vehicular Ad hoc Network (VANET) applications rely heavily on broadcast transmission of traffic related information to all reachable nodes within a certain geographical area. Among various broadcast approaches, flooding is the first broadcasting technique. Each node rebroadcasts the received message exactly once, which results in broadcast storm problems. Some mechanisms have been proposed to improve flooding in Mobile Ad hoc Networks (MANET), but they are not effective for VANET and only a few studies have addressed this issue. We propose two distance-based and timer-based broadcast suppression techniques: 15P(15percent) and slotted 15P. In the first (distance based) scheme, node's transmission range is divided into three ranges (80%,15%and5%). Only nodes within 15% range will rebroadcast received packet. Specific packet retransmission range (15%) is introduced to reduce the number of messages reforwarding nodes that will mitigate the broadcaststorm. In the second (timer-based) scheme, waiting time allocation for nodes within 15% range isused to significantly reduce the broadcaststorm. The proposed schemes are distributed and reliedon GPS information and do not requireany other prior knowledge about network topology. To analyze the performance of proposed schemes, statistics such as link load and the number of retransmitted nodes are presented. Our simulation results show that the proposed schemes can significantly reduce link load at high node densities up to 90 percent compared to a simple broadcast flooding technique.