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Journal of information and communication convergence engineering
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Journal DOI :
The Korean Institute of Information and Commucation Engineering
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Volume & Issues
Volume 14, Issue 2 - Jun 2016
Volume 14, Issue 1 - Mar 2016
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Two-Stage Spectrum Sensing Scheme Using Fuzzy Logic for Cognitive Radio Networks
Satrio, Cahyo Tri ; Jaeshin, Jang ;
Journal of information and communication convergence engineering, volume 14, issue 1, 2016, Pages 1~8
DOI : 10.6109/jicce.2016.14.1.001
Spectrum sensing in cognitive radio networks allows secondary users to sense the unused spectrum without causing interference to primary users. Cognitive radio requires more accurate sensing results from unused portions of the spectrum. Accurate spectrum sensing techniques can reduce the probability of false alarms and misdetection. In this paper, a two-stage spectrum sensing scheme is proposed for cooperative spectrum sensing in cognitive radio networks. In the first stage, spectrum sensing is executed for each secondary user using energy detection based on double adaptive thresholds to determine the spectrum condition. If the energy value lies between two thresholds, a fuzzy logic scheme is applied to determine the channel conditions more accurately. In the second stage, a fusion center combines the results of each secondary user and uses a fuzzy logic scheme for combining all decisions. The simulation results show that the proposed scheme provides increased sensing accuracy by about 20% in some cases.
Why Mobile Operators Introduced Data Plans: An Analysis of Voice and Data Usage Patterns
Lee, Hoon ;
Journal of information and communication convergence engineering, volume 14, issue 1, 2016, Pages 9~13
DOI : 10.6109/jicce.2016.14.1.009
With the introduction of the data-oriented plan for LTE service, one may concerned with the background of the ISP's policy in charging for LTE services. In this work we investigate the latest usage patterns of voice and data applications for customers over the current mobile network, via which we investigate why mobile operators introduced data-oriented plans. To be specific, we collected the real-field data for the volume of voice and data traffic from the LTE network before the data-oriented plans were introduced. From the collected data we compute the absolute volume as well as the proportion of voice and data applications. From these observations we infer mobile operators' reasoning behind the decision to introduce data-oriented plans with unlimited voice calls over the mobile network.
Performance Evaluation of a New AODV Protocol with Auxiliary Metrics
Ngo, Van-Vuong ; Jang, Jaeshin ;
Journal of information and communication convergence engineering, volume 14, issue 1, 2016, Pages 14~20
DOI : 10.6109/jicce.2016.14.1.014
The AODV protocol uses many RREQ messages and one RREP message in the path-discovery process. This protocol has only one metric, the number of hops. Although it is simple, this protocol is not efficient. To avoid this problem, we propose a new AODV with two auxiliary metrics (AuM-2-AODV). The AuM-2-AODV protocol tries multiple route replies, which reduces the chance of path failure and helps the network obtain a better data rate. It has two auxiliary metrics, the remaining energy of its nodes and the number of HELLO messages received at the nodes. With these two metrics, the reliable path from the source node to the destination node will be chosen. In this paper, the performance of the AuM-2-AODV is evaluated using the NS-3 simulator. The performance results show that AuM-2-AODV provides greater throughput and packet delivery ratio by 20% and up to 50% and about 100% in some cases, respectively, than previous protocols.
Dynamic Multi-frame Transmission Technology Using the WiMedia MAC for Multi-hop N-screen Services
Hur, Kyeong ;
Journal of information and communication convergence engineering, volume 14, issue 1, 2016, Pages 21~25
DOI : 10.6109/jicce.2016.14.1.021
N-screen is a promising technology to improve support for multimedia multicasting, content sharing, content mobility, media scalability, and seamless mobility. In this paper, the WiMedia distributed-MAC (D-MAC) protocol is adopted for development of a seamless N-screen wireless service. Furthermore, to provide a multi-hop, one source multi-use N-screen service through point to point streaming in a seamless D-MAC protocol, a dynamic multi-frame transmission technology is proposed. In this technology, a dynamic time slot allocation scheme and a multi-hop resource reservation scheme are combined. In the proposed dynamic time slot allocation scheme, two thresholds, a hard threshold and a soft threshold, are included to satisfy the power consumption and delay requirements. A multi-frame DRP reservation scheme is proposed to minimize end-to-end delay during the multi-hop transmissions between N-screen devices. The proposed dynamic multi-frame transmission scheme enhances N-screen performance in terms of the multi-hop link establishment success rate and link establishment time compared to the conventional WiMedia D-MAC system.
Optimized and Portable FPGA-Based Systolic Cell Architecture for Smith-Waterman-Based DNA Sequence Alignment
Shah, Hurmat Ali ; Hasan, Laiq ; Koo, Insoo ;
Journal of information and communication convergence engineering, volume 14, issue 1, 2016, Pages 26~34
DOI : 10.6109/jicce.2016.14.1.026
The alignment of DNA sequences is one of the important processes in the field of bioinformatics. The Smith-Waterman algorithm (SWA) performs optimally for aligning sequences but is computationally expensive. Field programmable gate array (FPGA) performs the best on parameters such as cost, speed-up, and ease of re-configurability to implement SWA. The performance of FPGA-based SWA is dependent on efficient cell-basic implementation-unit design. In this paper, we present an optimized systolic cell design while avoiding oversimplification, very large-scale integration (VLSI)-level design, and direct mapping of iterative equations such as previous cell designs. The proposed design makes efficient use of hardware resources and provides portability as the proposed design is not based on gate-level details. Our cell design implementing a linear gap penalty resulted in a performance improvement of 32× over a GPP platform and surpassed the hardware utilization of another implementation by a factor of 4.23.
Design of a 94-GHz Single Balanced Mixer Using Planar Schottky Diodes with a Nano-Dot Structure on a GaAs Substrate
Uhm, Won-Young ; Ryu, Keun-Kwan ; Kim, Sung-Chan ;
Journal of information and communication convergence engineering, volume 14, issue 1, 2016, Pages 35~39
DOI : 10.6109/jicce.2016.14.1.035
In this paper, we develop a 94-GHz single balanced mixer with low conversion loss using planar Schottky diodes on a GaAs substrate. The GaAs Schottky diode has a nanoscale anode with a T-shaped disk that can yield high cutoff frequency characteristics. The fabricated Schottky diode with an anode diameter of 500 nm has a series resistance of 21 Ω, an ideality factor of 1.32, a junction capacitance of 8.03 fF, and a cutoff frequency of 944 GHz. Based on this technology, a 94-GHz single balanced mixer was constructed. The fabricated mixer shows an average conversion loss of -7.58 dB at an RF frequency of 92.5 GHz to 95 GHz and an IF frequency of 500 MHz with an LO power of 7 dBm. The RF-to-LO isolation characteristics were greater than -32 dB. These values are considered to be attributed to superior Schottky diode characteristics.
Device Coupling Effects of Monolithic 3D Inverters
Yu, Yun Seop ; Lim, Sung Kyu ;
Journal of information and communication convergence engineering, volume 14, issue 1, 2016, Pages 40~44
DOI : 10.6109/jicce.2016.14.1.040
The device coupling between the stacked top/bottom field-effect transistors (FETs) in two types of monolithic 3D inverter (M3INV) with/without a metal layer in the bottom tier is investigated, and then the regime of the thickness T
and dielectric constant ε
of the inter-layer distance (ILD), the doping concentration N
), and length L
of the channel, and the side-wall length L
where the stacked FETs are coupled are studied. When N
) < 10
< 20 nm, the threshold voltage shift of the top FET varies almost constantly by the gate voltage of the bottom FET, but when N
) > 10
> 20 nm, the shift decreases and increases, respectively. M3INVs with T
≥ 50 nm and ε
≤ 3.9 can neglect the interaction between the stacked FETs, but when T
do not meet the above conditions, the interaction must be taken into consideration.
Wearable Sensor-Based Biometric Gait Classification Algorithm Using WEKA
Youn, Ik-Hyun ; Won, Kwanghee ; Youn, Jong-Hoon ; Scheffler, Jeremy ;
Journal of information and communication convergence engineering, volume 14, issue 1, 2016, Pages 45~50
DOI : 10.6109/jicce.2016.14.1.045
Gait-based classification has gained much interest as a possible authentication method because it incorporate an intrinsic personal signature that is difficult to mimic. The study investigates machine learning techniques to mitigate the natural variations in gait among different subjects. We incorporated several machine learning algorithms into this study using the data mining package called Waikato Environment for Knowledge Analysis (WEKA). WEKA's convenient interface enabled us to apply various sets of machine learning algorithms to understand whether each algorithm can capture certain distinctive gait features. First, we defined 24 gait features by analyzing three-axis acceleration data, and then selectively used them for distinguishing subjects 10 years of age or younger from those aged 20 to 40. We also applied a machine learning voting scheme to improve the accuracy of the classification. The classification accuracy of the proposed system was about 81% on average.
Three-Dimensional Automatic Target Recognition System Based on Optical Integral Imaging Reconstruction
Lee, Min-Chul ; Inoue, Kotaro ; Cho, Myungjin ;
Journal of information and communication convergence engineering, volume 14, issue 1, 2016, Pages 51~56
DOI : 10.6109/jicce.2016.14.1.051
In this paper, we present a three-dimensional (3-D) automatic target recognition system based on optical integral imaging reconstruction. In integral imaging, elemental images of the reference and target 3-D objects are obtained through a lenslet array or a camera array. Then, reconstructed 3-D images at various reconstruction depths can be optically generated on the output plane by back-projecting these elemental images onto a display panel. 3-D automatic target recognition can be implemented using computational integral imaging reconstruction and digital nonlinear correlation filters. However, these methods require non-trivial computation time for reconstruction and recognition. Instead, we implement 3-D automatic target recognition using optical cross-correlation between the reconstructed 3-D reference and target images at the same reconstruction depth. Our method depends on an all-optical structure to realize a real-time 3-D automatic target recognition system. In addition, we use a nonlinear correlation filter to improve recognition performance. To prove our proposed method, we carry out the optical experiments and report recognition results.
Visual Quality Enhancement of Three-Dimensional Integral Imaging Reconstruction for Partially Occluded Objects Using Exemplar-Based Image Restoration
Zhang, Miao ; Zhong, Zhaolong ; Piao, Yongri ;
Journal of information and communication convergence engineering, volume 14, issue 1, 2016, Pages 57~63
DOI : 10.6109/jicce.2016.14.1.057
In generally, the resolution of reconstructed three-dimensional images can be seriously degraded by undesired occlusions in the integral imaging system, because the undesired information of the occlusion overlap the three-dimensional images to be reconstructed. To solve the problem of the undesired occlusion, we present an exemplar-based image restoration method in integral imaging system. In the proposed method, a minimum spanning tree-based stereo matching method is used to remove the region of undesired occlusions in each elemental image. After that, the removed occlusion region of each elemental images are re-established by using the exemplar-based image restoration method. For further improve the performance of the image restoration, the structure tensor is used to solve the filling error cause by discontinuous structures. Finally, the resolution enhanced three-dimensional images are reconstructed by using the restored elemental images. The preliminary experiments are presented to demonstrate the feasibility of the proposed method.