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REFERENCE LINKING PLATFORM OF KOREA S&T JOURNALS
> Journal Vol & Issue
Journal of information and communication convergence engineering
Journal Basic Information
Journal DOI :
The Korean Institute of Information and Commucation Engineering
Editor in Chief :
Volume & Issues
Volume 11, Issue 4 - Dec 2013
Volume 11, Issue 3 - Sep 2013
Volume 11, Issue 2 - Jun 2013
Volume 11, Issue 1 - Mar 2013
Selecting the target year
A Wilkinson-Type Balun Using a Composite Right/Left-Handed Transmission Line
Park, Unghee ;
Journal of information and communication convergence engineering, volume 11, issue 3, 2013, Pages 147~152
DOI : 10.6109/jicce.2013.11.3.147
A novel balun being the structure of a Wilkinson power divider is suggested and fabricated. One of the power dividing paths in the suggested balun uses a conventional
transmission line for
phase shifting, and the other path uses a composite right/left-handed -
transmission line for
phase shifting with four series capacitors and three parallel inductors. In addition, the suggested balun uses two
resistors and a conventional
transmission line of
electrical length between the two output ports, achieving good isolation and reflection values of two balanced ports. The suggested balun is simulated by the advanced design system simulation program and fabricated on TLX-9 20-mil substrate. The fabricated balun has a very good values of
= -27.46 dB,
= -3.40 dB, and
= -3.28 dB, a phase difference of
, a magnitude difference of 0.12 dB, and a delay difference of 0.1 ns, with
= -36.28 dB,
= -27.19 dB, and
= -25.2 dB at 1 GHz, respectively.
A Hierarchical Time Division Multiple Access Medium Access Control Protocol for Clustered Underwater Acoustic Networks
Yun, Changho ; Cho, A-Ra ; Kim, Seung-Geun ; Park, Jong-Won ; Lim, Yong-Kon ;
Journal of information and communication convergence engineering, volume 11, issue 3, 2013, Pages 153~166
DOI : 10.6109/jicce.2013.11.3.153
A hierarchical time division multiple access (HTDMA) medium access control (MAC) protocol is proposed for clustered mobile underwater acoustic networks. HTDMA consists of two TDMA scheduling protocols (i.e., TDMA1 and TDMA2) in order to accommodate mobile underwater nodes (UNs). TDMA1 is executed among surface stations (e.g., buoys) using terrestrial wireless communication in order to share mobility information obtained from UNs which move cluster to cluster. TDMA2 is executed among UNs, which send data to their surface station as a cluster head in one cluster. By sharing mobility information, a surface station can instantaneously determine the number of time slots in a TDMA2 frame up to as many as the number of UNs which is currently residing in its cluster. This can enhance delay and channel utilization performance by avoiding the occurrence of idle time slots. We analytically investigate the delay of HTDMA, and compare it with that of wellknown contention-free and contention-based MAC protocols, which are TDMA and Slotted-ALOHA, respectively. It is shown that HTDMA remarkably decreases delay, compared with TDMA and Slotted-ALOHA.
Performance Evaluation of Coordinated Multi-Point Transmission and Reception in Indoor Mobile Communication Systems
Lee, Woongsup ; Lee, Howon ;
Journal of information and communication convergence engineering, volume 11, issue 3, 2013, Pages 167~172
DOI : 10.6109/jicce.2013.11.3.167
Recently, mobile communication systems are suffering from exponentially increasing data traffic. As a promising solution to the increase in data traffic, a coordinated multi-point transmission and reception (CoMP) scheme has been proposed. Although a great deal of research has been done on this new technology, the performance of mobile communication systems with CoMP has not been evaluated properly in a typical indoor environment. To address this, we have developed a system-level simulator and evaluated the performance of mobile communication systems with CoMP. Unlike previous works, we have used an actual antenna pattern in our simulator and link-level results are properly taken into account through link-level abstraction. By using a system-level simulator, we have evaluated the performance of mobile communication systems with CoMP in an indoor environment and found that unlike an outdoor cellular environment, CoMP may not improve the performance of overall mobile communication systems in an indoor environment.
An Enhanced Searching Algorithm over Unstructured Mobile P2P Overlay Networks
Shah, Babar ; Kim, Ki-Il ;
Journal of information and communication convergence engineering, volume 11, issue 3, 2013, Pages 173~178
DOI : 10.6109/jicce.2013.11.3.173
To discover objects of interest in unstructured peer-to-peer networks, the peers rely on flooding query messages which create incredible network traffic. This article evaluates the performance of an unstructured Gnutella-like protocol over mobile ad-hoc networks and proposes modifications to improve its performance. This paper offers an enhanced mechanism for an unstructured Gnutella-like network with improved peer features to better meet the mobility requirement of ad-hoc networks. The proposed system introduces a novel caching optimization technique and enhanced ultrapeer selection scheme to make communication more efficient between peers and ultrapeers. The paper also describes an enhanced query mechanism for efficient searching by applying multiple walker random walks with a jump and replication technique. According to the simulation results, the proposed system yields better performance than Gnutella, XL-Gnutella, and random walk in terms of the query success rate, query response time, network load, and overhead.
Document Clustering Using Semantic Features and Fuzzy Relations
Kim, Chul-Won ; Park, Sun ;
Journal of information and communication convergence engineering, volume 11, issue 3, 2013, Pages 179~184
DOI : 10.6109/jicce.2013.11.3.179
Traditional clustering methods are usually based on the bag-of-words (BOW) model. A disadvantage of the BOW model is that it ignores the semantic relationship among terms in the data set. To resolve this problem, ontology or matrix factorization approaches are usually used. However, a major problem of the ontology approach is that it is usually difficult to find a comprehensive ontology that can cover all the concepts mentioned in a collection. This paper proposes a new document clustering method using semantic features and fuzzy relations for solving the problems of ontology and matrix factorization approaches. The proposed method can improve the quality of document clustering because the clustered documents use fuzzy relation values between semantic features and terms to distinguish clearly among dissimilar documents in clusters. The selected cluster label terms can represent the inherent structure of a document set better by using semantic features based on non-negative matrix factorization, which is used in document clustering. The experimental results demonstrate that the proposed method achieves better performance than other document clustering methods.
A Digital Hologram Encryption Method Using Data Scrambling of Frequency Coefficients
Choi, Hyun-Jun ;
Journal of information and communication convergence engineering, volume 11, issue 3, 2013, Pages 185~189
DOI : 10.6109/jicce.2013.11.3.185
A digital hologram generated by a computer calculation (computer-generated hologram or capture using charge-coupled device [CCD] camera) is one of the most expensive types of content, and its usage is expanding. Thus, it is highly necessary to protect the ownership of digital holograms. This paper presents an efficient visual security scheme for holographic image reconstruction with a low scrambling cost. Most recent studies on optical security concentrate their focus on security authentication using optical characteristics. However, in this paper, we propose an efficient scrambling method to protect a digital hologram. Therefore, we introduce in this paper several scrambling attempts in both the spatial domain and frequency domain on the basis of the results of analyzing the properties of the coefficients in each domain. To effectively hide the image information, 1/4, 1/256, and 1/16,384 of the original digital hologram needs to be scrambled for the spatial-domain scheme, Fresnel-domain scheme, and discrete cosine transform-domain scheme, respectively. The encryption schemes and the analyses in this paper can be expected to be useful in the research on encryption and other works on digital holograms.
FPGA-Based Design of Black Scholes Financial Model for High Performance Trading
Choo, Chang ; Malhotra, Lokesh ; Munjal, Abhishek ;
Journal of information and communication convergence engineering, volume 11, issue 3, 2013, Pages 190~198
DOI : 10.6109/jicce.2013.11.3.190
Recently, one of the most vital advancement in the field of finance is high-performance trading using field-programmable gate array (FPGA). The objective of this paper is to design high-performance Black Scholes option trading system on an FPGA. We implemented an efficient Black Scholes Call Option System IP on an FPGA. The IP may perform 180 million transactions per second after initial latency of 208 clock cycles. The implementation requires the 64-bit IEEE double-precision floatingpoint adder, multiplier, exponent, logarithm, division, and square root IPs. Our experimental results show that the design is highly efficient in terms of frequency and resource utilization, with the maximum frequency of 179 MHz on Altera Stratix V.
Emergency Monitoring System Based on a Newly-Developed Fall Detection Algorithm
Yi, Yun Jae ; Yu, Yun Seop ;
Journal of information and communication convergence engineering, volume 11, issue 3, 2013, Pages 199~206
DOI : 10.6109/jicce.2013.11.3.199
An emergency monitoring system for the elderly, which uses acceleration data measured with an accelerometer, angular velocity data measured with a gyroscope, and heart rate measured with an electrocardiogram, is proposed. The proposed fall detection algorithm uses multiple parameter combinations in which all parameters, calculated using tri-axial accelerations and bi-axial angular velocities, are above a certain threshold within a time period. Further, we propose an emergency detection algorithm that monitors the movements of the fallen elderly person, after a fall is detected. The results show that the proposed algorithms can distinguish various types of falls from activities of daily living with 100% sensitivity and 98.75% specificity. In addition, when falls are detected, the emergency detection rate is 100%. This suggests that the presented fall and emergency detection method provides an effective automatic fall detection and emergency alarm system. The proposed algorithms are simple enough to be implemented into an embedded system such as 8051-based microcontroller with 128 kbyte ROM.
3D Facial Landmark Tracking and Facial Expression Recognition
Medioni, Gerard ; Choi, Jongmoo ; Labeau, Matthieu ; Leksut, Jatuporn Toy ; Meng, Lingchao ;
Journal of information and communication convergence engineering, volume 11, issue 3, 2013, Pages 207~215
DOI : 10.6109/jicce.2013.11.3.207
In this paper, we address the challenging computer vision problem of obtaining a reliable facial expression analysis from a naturally interacting person. We propose a system that combines a 3D generic face model, 3D head tracking, and 2D tracker to track facial landmarks and recognize expressions. First, we extract facial landmarks from a neutral frontal face, and then we deform a 3D generic face to fit the input face. Next, we use our real-time 3D head tracking module to track a person's head in 3D and predict facial landmark positions in 2D using the projection from the updated 3D face model. Finally, we use tracked 2D landmarks to update the 3D landmarks. This integrated tracking loop enables efficient tracking of the non-rigid parts of a face in the presence of large 3D head motion. We conducted experiments for facial expression recognition using both framebased and sequence-based approaches. Our method provides a 75.9% recognition rate in 8 subjects with 7 key expressions. Our approach provides a considerable step forward toward new applications including human-computer interactions, behavioral science, robotics, and game applications.
Extracting Heart Rate Variability from a Smartphone Camera
Lenskiy, Artem A. ; Aitzhan, Yerlan ;
Journal of information and communication convergence engineering, volume 11, issue 3, 2013, Pages 216~222
DOI : 10.6109/jicce.2013.11.3.216
It is known that blood circulation in human body causes the skin tone to change concurrently with heartbeats. A number of apps have been developed to measure the heartbeat using smartphone camera; however, no any further analysis is performed. In this paper we propose an algorithm that detects heartbeats from the phone's camera and further extracts the heart rate variability (HRV). We compare the HRV extracted from the camera with the HRV extracted from the electrocardiogram. We estimated a number of commonly used HRV characteristics and compared them. Our results show that smartphone camera leads to slightly overestimated characteristics although the difference in extracted HRV signals is negligible. As a consequence we suggest that a smartphone camera can be employed in a quick heart diagnosis and diagnosis of autonomic nervous system.