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REFERENCE LINKING PLATFORM OF KOREA S&T JOURNALS
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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 13, Issue 4 - Dec 2015
Volume 13, Issue 3 - Aug 2015
Volume 13, Issue 2 - Jun 2015
Volume 13, Issue 1 - Mar 2015
Selecting the target year
Enhanced Spatial Modulation of Indoor Visible Light Communication
Shan, Ye ; Li, Ming ; Jin, Minglu ;
Journal of information and communication convergence engineering, volume 13, issue 1, 2015, Pages 1~6
DOI : 10.6109/jicce.2015.13.1.001
In this study, we consider visible light communication in an indoor line-of-sight environment. It has been proved that among the multiple input multiple output (MIMO) techniques, spatial modulation (SM) performs better than repetition coding (RC) and spatial multiplexing (SMP). On the basis of a combination of SM and pulse amplitude modulation (PAM), here, we propose an enhanced SM algorithm to improve the bit error rate. Traditional SM activates only one light-emitting diode (LED) at one time, and the proposed enhanced SM activates two LEDs at one time and reduces the intensity levels of PAM by half. Under the condition of a highly correlated channel, power imbalance is used to improve the algorithm performance. The comparison between the two schemes is implemented at the same signal-to-noise ratio. The simulation results illustrate that the enhanced SM outperforms the traditional SM in both highly correlated and lowly correlated channels. Furthermore, the proposed enhanced SM scheme can increase the transmission rate in most cases.
Improving the Performance of Multi-Hop Wireless Networks by Selective Transmission Power Control
Kim, Tae-Hoon ; Tipper, David ; Krishnamurthy, Prashant ;
Journal of information and communication convergence engineering, volume 13, issue 1, 2015, Pages 7~14
DOI : 10.6109/jicce.2015.13.1.007
In a multi-hop wireless network, connectivity is determined by the link that is established by the receiving signal strength computed by subtracting the path loss from the transmission power. Two path loss models are commonly used in research, namely two-ray ground and shadow fading, which determine the receiving signal strength and affect the link quality. Link quality is one of the key factors that affect network performance. In general, network performance improves with better link quality in a wireless network. In this study, we measure the network connectivity and performance in a shadow fading path loss model, and our observation shows that both are severely degraded in this path loss model. To improve network performance, we propose power control schemes utilizing link quality to identify the set of nodes required to adjust the transmission power in order to improve the network throughput in both homogeneous and heterogeneous multi-hop wireless networks. Numerical studies to evaluate the proposed schemes are presented and compared.
The Design of an Efficient Proxy-Based Framework for Mobile Cloud Computing
Zhang, Zhijun ; Lim, HyoTaek ; Lee, Hoon Jae ;
Journal of information and communication convergence engineering, volume 13, issue 1, 2015, Pages 15~20
DOI : 10.6109/jicce.2015.13.1.015
The limited battery power in the mobile environment, lack of sufficient wireless bandwidth, limited resources of mobile terminals, and frequent breakdowns of the wireless network have become major hurdles in the development of mobile cloud computing (MCC). In order to solve the abovementioned problems, This paper propose a proxy-based MCC framework by adding a proxy server between mobile devices and cloud services to optimize the access to cloud services by mobile devices on the network transmission, application support, and service mode levels. Finally, we verify the effectiveness of the developed framework through an experimental analysis. This framework can ensure that mobile users have efficient access to cloud services.
Design and Implementation of Wireless Sensor Network for Freeze Dryer
Cho, Young Seek ; Kwon, Jaerock ; Choi, Seyeong ;
Journal of information and communication convergence engineering, volume 13, issue 1, 2015, Pages 21~26
DOI : 10.6109/jicce.2015.13.1.021
A wireless sensor network (WSN) is designed and implemented for a freeze dryer. Freeze-drying technology is widely used in the fields of pharmacy and biotechnology as well as the food and agriculture industries. Taking into account the demand for high-resolution pressure and temperature measurements in a freeze dryer, the proposed WSN has a significant advantage of creating a monitoring environment in a freeze dryer. The proposed WSN uses a ZigBee/IEEE 802.15.4 network with an altimeter module that contains a high-resolution pressure and temperature sensor with a serial digital data interface. The ZigBee network is suitable for low-energy and low-data-rate applications in the field of wireless communication. The altimeter module is capable of sensing pressure in the range of 7.5-975 Torr (10-1300 mbar) and temperature in the range of
with a DC power consumption of
. The implemented WSN is installed in a commercial laboratory freeze dryer in order to demonstrate its functionality and efficiency. A comparison with the temperature profile measured by a thermocouple installed in the freeze dryer reveals that the resolution of the temperature profile measured by WSN is superior to that measured by the thermocouple.
Consecutive Operand-Caching Method for Multiprecision Multiplication, Revisited
Seo, Hwajeong ; Kim, Howon ;
Journal of information and communication convergence engineering, volume 13, issue 1, 2015, Pages 27~35
DOI : 10.6109/jicce.2015.13.1.027
Multiprecision multiplication is the most expensive operation in public key-based cryptography. Therefore, many multiplication methods have been studied intensively for several decades. In Workshop on Cryptographic Hardware and Embedded Systems 2011 (CHES2011), a novel multiplication method called 'operand caching' was proposed. This method reduces the number of required load instructions by caching the operands. However, it does not provide full operand caching when changing the row of partial products. To overcome this problem, a novel method, that is, 'consecutive operand caching' was proposed in Workshop on Information Security Applications 2012 (WISA2012). It divides a multiplication structure into partial products and reconstructs them to share common operands between previous and next partial products. However, there is still room for improvement; therefore, we propose a finely designed operand-caching mode to minimize useless memory accesses when the first row is changed. Finally, we reduce the number of memory access instructions and boost the speed of the overall multiprecision multiplication for public key cryptography.
Current Technologies and Prospects of Electromagnetic Wave Absorbers
Kim, Dong Il ; Kim, Soo Jeong ; Kwak, Hyun Soo ; Joo, Yang Ick ;
Journal of information and communication convergence engineering, volume 13, issue 1, 2015, Pages 36~41
DOI : 10.6109/jicce.2015.13.1.036
With the rapidly increasing and widespread use of electronic and controlling equipment, the control of the electromagnetic (EM) wave environment becomes an important social issue. To solve the electromagnetic compatibility (EMC, both electromagnetic interface and electromagnetic susceptibility) problems, in this paper, we introduce the countermeasure techniques focused on EM wave absorbers for EMC problems in our laboratory at the Korea Maritime and Ocean University. The current technologies related to EM wave absorbers to solve EMC problems will first be described. The prospects of and a design for EM wave absorbers including a smart absorber with a heat radiating function will then be suggested.
Laser Spot Detection Using Robust Dictionary Construction and Update
Wang, Zhihua ; Piao, Yongri ; Jin, Minglu ;
Journal of information and communication convergence engineering, volume 13, issue 1, 2015, Pages 42~49
DOI : 10.6109/jicce.2015.13.1.042
In laser pointer interaction systems, laser spot detection is one of the most important technologies, and most of the challenges in this area are related to the varying backgrounds, and the real-time performance of the interaction system. In this paper, we present a robust dictionary construction and update algorithm based on a sparse model of background subtraction. In order to control dynamic backgrounds, first, we determine whether there is a change in the backgrounds; if this is true, the new background can be directly added to the dictionary configurations; otherwise, we run an online cumulative average on the backgrounds to update the dictionary. The proposed dictionary construction and update algorithm for laser spot detection, is robust to the varying backgrounds and noises, and can be implemented in real time. A large number of experimental results have confirmed the superior performance of the proposed method in terms of the detection error and real-time implementation.
Visible Wavelength Photonic Insulator for Enhancing LED Light Emission
Ryoo, Kwangki ; Lee, Jeong Bong ;
Journal of information and communication convergence engineering, volume 13, issue 1, 2015, Pages 50~55
DOI : 10.6109/jicce.2015.13.1.050
We report design and simulation of a two-dimensional (2D) silicon-based nanophotonic crystal as an optical insulator to enhance the light emission efficiency of light-emitting diodes (LEDs). The device was designed in a manner that a triangular array silicon photonic crystal light insulator has a square trench in the middle where LED can be placed. By varying the normalized radius in the range of 0.3-0.5 using plane wave expansion method (PWEM), we found that the normalized radius of 0.45 creates a large band gap for transverse electric (TE) polarization. Subsequently a series of light propagation simulation were carried out using 2D and three-dimensional (3D) finite-difference time-domain (FDTD). The designed silicon-based light insulator device shows optical characteristics of a region in which light propagation was forbidden in the horizontal plane for TE light with most of the visible light spectrum in the wavelength range of 450 nm to 600 nm.
High-Aspect-Ratio Nanoscale Patterning in a Negative Tone Photoresist
Ryoo, Kwangki ; Lee, Jeong Bong ;
Journal of information and communication convergence engineering, volume 13, issue 1, 2015, Pages 56~61
DOI : 10.6109/jicce.2015.13.1.056
The demand for high-aspect-ratio structures has been increasing in the field of semiconductors and other applications. Here, we present the commercially available negative-tone SU-8 as a potential resist that can be used for direct patterning of high-aspect-ratio structures at the submicron scale and the nanoscale. Such resist patterns can be used as polymeric molds to create high-aspect-ratio metallic submicron and nanoscale structures by using electroplating. Compared with poly (methyl methacrylate) (PMMA), we found that the negative tone resist required an exposure dose that was less than that of PMMA of equal thickness by a factor of 100-150. Patterning of up to 4:1 aspect ratio SU-8 structures with a minimum feature size of 500 nm was demonstrated. In addition, nanoimprint lithography was studied to further extend the aspect ratio to realize a minimum feature size of less than 10 nm with an extremely high aspect ratio in the negative resist.
Digital Watermarking Algorithm for Multiview Images Generated by Three-Dimensional Warping
Park, Scott ; Kim, Bora ; Kim, Dong-Wook ; Seo, Youngho ;
Journal of information and communication convergence engineering, volume 13, issue 1, 2015, Pages 62~68
DOI : 10.6109/jicce.2015.13.1.062
In this paper, we propose a watermarking method for protecting the ownership of three-dimensional (3D) content generated from depth and texture images. After selecting the target areas to preserve the watermark by depth-image-based rendering, the reference viewpoint image is moved right and left in the depth map until the maximum viewpoint change is obtained and the overlapped region is generated for marking space. The region is divided into four subparts and scanned. After applying discrete cosine transform, the watermarks are inserted. To extract the watermark, the viewpoint can be changed by referring to the viewpoint image and the corresponding depth image initially, before returning to the original viewpoint. The watermark embedding and extracting algorithm are based on quantization. The watermarked image is attacked by the methods of JPEG compression, blurring, sharpening, and salt-pepper noise.