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REFERENCE LINKING PLATFORM OF KOREA S&T JOURNALS
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IEIE Transactions on Smart Processing and Computing
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Journal DOI :
The Institute of Electronics Engineers of Korea
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Volume & Issues
Volume 3, Issue 6 - Dec 2014
Volume 3, Issue 5 - Oct 2014
Volume 3, Issue 4 - Aug 2014
Volume 3, Issue 3 - Jun 2014
Volume 3, Issue 2 - Apr 2014
Volume 3, Issue 1 - Feb 2014
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A Capacitor Mismatch Error Cancelation Technique for High-Speed High-Resolution Pipeline ADC
Park, Cheonwi ; Lee, Byung-Geun ;
IEIE Transactions on Smart Processing and Computing, volume 3, issue 4, 2014, Pages 161~166
DOI : 10.5573/IEIESPC.2014.3.4.161
An accurate gain-of-two amplifier, which successfully reduces the capacitor mismatch error is proposed. This amplifier has similar circuit complexity and linearity improvement to the capacitor error-averaging technique, but operates with two clock phases just like the conventional pipeline stage. This makes it suitable for high-speed, high-resolution analog-to-digital converters (ADCs). Two ADC architectures employing the proposed accurate gain-of-two amplifier are also presented. The simulation results show that the proposed ADCs can achieve 15-bit linearity with 8-bit capacitor matching.
Maximum Power Waveform Design for Bistatic MIMO Radar System
Shin, Hyuksoo ; Yeo, Kwang-Goo ; Yang, Hoongee ; Chung, Youngseek ; Kim, Jongman ; Chung, Wonzoo ;
IEIE Transactions on Smart Processing and Computing, volume 3, issue 4, 2014, Pages 167~172
DOI : 10.5573/IEIESPC.2014.3.4.167
In this paper we propose a waveform design algorithm that localizes the maximum output power in the target direction. We extend existing monostatic radar optimal waveform design schemes to bistatic multiple-input multiple-output (MIMO) radar systems. The algorithm simultaneously calculates the direction of departure (DoD) and the direction of arrival (DoA) using a two-dimensional multiple signal classification (MUSIC) method, and successfully localizes the maximum transmitted power to the target locations by exploiting the calculated DoD. The simulation results confirm the performance of the proposed algorithm.
Throughput Analysis of CSMA/CA-based Cognitive Radio Networks in Idle Periods
Wang, Hanho ; Hong, Daesik ;
IEIE Transactions on Smart Processing and Computing, volume 3, issue 4, 2014, Pages 173~180
DOI : 10.5573/IEIESPC.2014.3.4.173
Random access protocols feature inherent sensing functionality and distributed coordination, making them suitable for cognitive radio communication environments, where secondary users must detect the white space of the primary spectrum and utilize the idle primary spectrum efficiently without centralized control. These characteristics have led to the adoption of carrier-sensing-multiple-access/collision-avoidance (CSMA/CA) in cognitive radio. This paper proposes a new analytical framework for evaluating the performance of a CSMA/CA protocol that considers the characteristics of idle periods based on the primary traffic behavior in cognitive radio systems. In particular, the CSMA/CA-based secondary network was analyzed in the terms of idle period utilization, which is the average effective data transmission time portion in an idle period. The use of the idle period was maximized by taking its statistical features into consideration.
Performance Analysis of Uplink Cognitive Radio Transmission based on Overloaded MC-DS-CDMA
Sundararajan, Mohandass ; Govindaswamy, Umamaheswari ;
IEIE Transactions on Smart Processing and Computing, volume 3, issue 4, 2014, Pages 181~190
DOI : 10.5573/IEIESPC.2014.3.4.181
This paper reports a cognitive radio network architecture based on overloaded multicarrier direct sequence code division multiple access (O-MC-DS-CDMA). The O-MC-DSCDMA technique combines CDMA with a multicarrier modulation technique to overcome the channel fading effects. In this technique, secondary users are enabled to share the available bandwidth with the existing primary users. Two sets of orthogonal Gold codes are used to support the primary and secondary users simultaneously. The orthogonality between the spreading codes is lost due to the non-zero cross correlation between the codes and the timing synchronization error in the uplink transmission, which causes interference between primary and secondary users. This paper proposes two modified hybrid parallel/successive interference cancellation techniques for primary and secondary user base station receivers with multiple antennas to suppress the interference among users. Interference among the same group of users is cancelled by parallel interference cancellation and the interference among groups is cancelled using successive interference cancellation. The simulation results confirmed that the proposed modified interference cancellation techniques show better BER performance over conventional interference cancellation techniques.
Automatic Segmentation of Skin and Bone in CT Images using Iterative Thresholding and Morphological Image Processing
Kang, Ho Chul ; Shin, Yeong-Gil ; Lee, Jeongjin ;
IEIE Transactions on Smart Processing and Computing, volume 3, issue 4, 2014, Pages 191~194
DOI : 10.5573/IEIESPC.2014.3.4.191
This paper proposes a fast and efficient method to extract the skin and bone automatically in CT images. First, the images were smoothed by applying an anisotropic diffusion filter to remove noise. The whole body was then detected by thresholding, which was set automatically. In addition, the contour of the skin was segmented using morphological operators and connected component labeling (CCL). Finally, the bone was extracted by iterative thresholding.
Depth Evaluation from Pattern Projection Optimized for Automated Electronics Assembling Robots
Park, Jong-Rul ; Cho, Jun Dong ;
IEIE Transactions on Smart Processing and Computing, volume 3, issue 4, 2014, Pages 195~204
DOI : 10.5573/IEIESPC.2014.3.4.195
This paper presents the depth evaluation for object detection by automated assembling robots. Pattern distortion analysis from a structured light system identifies an object with the greatest depth from its background. An automated assembling robot should prior select and pick an object with the greatest depth to reduce the physical harm during the picking action of the robot arm. Object detection is then combined with a depth evaluation to provide contour, showing the edges of an object with the greatest depth. The contour provides shape information to an automated assembling robot, which equips the laser based proxy sensor, for picking up and placing an object in the intended place. The depth evaluation process using structured light for an automated electronics assembling robot is accelerated for an image frame to be used for computation using the simplest experimental set, which consists of a single camera and projector. The experiments for the depth evaluation process required 31 ms to 32 ms, which were optimized for the robot vision system that equips a 30-frames-per-second camera.
Efficient Rolling Shutter Distortion Removal using Hierarchical Block-based Motion Estimation
Lee, Donggeun ; Choi, Kang-Sun ;
IEIE Transactions on Smart Processing and Computing, volume 3, issue 4, 2014, Pages 205~211
DOI : 10.5573/IEIESPC.2014.3.4.205
This paper reports an efficient algorithm for accurate rolling shutter distortion removal. A hierarchical global motion estimation approach for a group of blocks reduces the level of computation by three orders of magnitude. In addition, the motion of each scanline is determined accurately by averaging two candidates obtained through cubic spline interpolation. The experimental results show that the proposed method produces accurate motion information with significant computation reduction and corrects the rolling shutter distortion effectively.
Development of Millimeter-Wave Communication Modem for Mobile Wireless Backhaul in Mobile Hotspot Network
Choi, Seung Nam ; Kim, Junhyeong ; Kim, Il Gyu ; Kim, Dae Jin ;
IEIE Transactions on Smart Processing and Computing, volume 3, issue 4, 2014, Pages 212~220
DOI : 10.5573/IEIESPC.2014.3.4.212
The current cellular communications are optimized for low mobility users, meaning that their performance is degraded at high speed. Therefore, passengers in a high-speed train experience very poor radio link quality due to the significantly large number of simultaneous handovers. In addition, wireless data traffic is expanding exponentially in trains, subways and buses due to the widespread use of smartphones and mobile devices. To solve the inherent problem of cellular communication networks and meet the growing traffic demand, this paper proposes the mobile hotspot network of a millimeter-wave communication system as a mobile wireless backhaul. This paper describes the physical layer design of uplink and downlink in the proposed system, and the performances of uplink and downlink are evaluated under Rician fading channel conditions. The implemented baseband prototype of the proposed millimeter-wave communication modem is presented. This system can provide a Gbps data rate service in high-speed trains carrying hundreds of wireless Internet users.
RF Energy Harvesting and Charging Circuits for Low Power Mobile Devices
Ahn, Chang-Jun ; Kamio, Takeshi ; Fujisaka, Hisato ; Haeiwa, Kazuhisa ;
IEIE Transactions on Smart Processing and Computing, volume 3, issue 4, 2014, Pages 221~225
DOI : 10.5573/IEIESPC.2014.3.4.221
Low power RF devices, such as RFID and Zigbee, are important for ubiquitous sensing. These devices, however, are powered by portable energy sources, such as batteries, which limits their use. To mitigate this problem, this study developed RF energy harvesting with W-CDMA for a low power RF device. Diodes are required with a low turn on voltage because the diode threshold is larger than the received peak voltage of the rectifying antenna (rectenna). Therefore, a Schottky diode HSMS-286 was used. A prototype of RF energy harvesting device showed the maximum gain of 5.8dBi for the W-CDMA signal. The 16 patch antennas were manufactured with a 10 dielectric constant PTFT board. In low power RF devices, the transmitter requires a step-up voltage of 2.5~5V with up to 35 mA. To meet this requirement, the Texas Instruments TPS61220 was used as a low input voltage step-up converter. From the evaluated result, the achievable incident power of the rectenna at 926mV to operate Zigbee can be obtained within a distance of 12m.
External Light Evasion Method for Large Multi-touch Screens
Park, Young-Jin ; Lyu, Hong-Kun ; Lee, Sang-Kook ; Cho, Hui-Sup ;
IEIE Transactions on Smart Processing and Computing, volume 3, issue 4, 2014, Pages 226~233
DOI : 10.5573/IEIESPC.2014.3.4.226
This paper presents an external light evasion method that rectifies the problem of misrecognition due to external lighting. The fundamental concept underlying the proposed method involves recognition of the differences between two images and elimination of the desynchronized external light by synchronizing the image sensor and inner light source of the optical touch screen. A range of artificial indoor light sources and natural sunlight are assessed. The proposed system synchronizes with a Vertical Synchronization (VSYNC) signal and the light source drive signal of the image sensor. Therefore, it can display synchronized light of the acquired image through the image sensor and remove external light that is not from the light source. A subtraction operation is used to find the differences and the absolute value of the result is utilized; hence, the order is irrelevant. The resulting image, which displays only a touched blob on the touchscreen, was created after image processing for coordination recognition and was then supplied to a coordination extraction algorithm.
A Hybrid Selection Method of Helpful Unlabeled Data Applicable for Semi-Supervised Learning Algorithm
Le, Thanh-Binh ; Kim, Sang-Woon ;
IEIE Transactions on Smart Processing and Computing, volume 3, issue 4, 2014, Pages 234~239
DOI : 10.5573/IEIESPC.2014.3.4.234
This paper presents an empirical study on selecting a small amount of useful unlabeled data to improve the classification accuracy of semi-supervised learning algorithms. In particular, a hybrid method of unifying the simply recycled selection method and the incrementally-reinforced selection method was considered and evaluated empirically. The experimental results, which were obtained from well-known benchmark data sets using semi-supervised support vector machines, demonstrated that the hybrid method works better than the traditional ones in terms of the classification accuracy.
A New In-band Full-duplex SIC Scheme Using a Phase Rotator
Lee, Haesoon ; Kim, Dongkyu ; Kim, Jinmin ; Hong, Daesik ;
IEIE Transactions on Smart Processing and Computing, volume 3, issue 4, 2014, Pages 240~245
DOI : 10.5573/IEIESPC.2014.3.4.240
How well the self-interference cancellation (SIC) technique performs is a primary issue in realizing an in-band full-duplex (FD) wireless communication system. One factor affecting its performance is channel estimation error on the self-interference channel. We propose a new analog SIC scheme which is robust to channel estimation error. It uses phase rotators in the radio frequency (RF) chain. We also derive closed-form equations for the residual self-interference of the proposed and the conventional schemes. The analytical and numerical results show that the residual self-interference under the proposed SIC scheme is less than that using the conventional scheme, even though channel estimation error is present.
Efficient Multi-Touch Detection Algorithm for Large Touch Screen Panels
Mohamed, Mohamed G.A. ; Cho, Tae-Won ; Kim, HyungWon ;
IEIE Transactions on Smart Processing and Computing, volume 3, issue 4, 2014, Pages 246~250
DOI : 10.5573/IEIESPC.2014.3.4.246
Large mutual capacitance touch screen panels (TSP) are susceptible to display and ambient noise. This paper presents a multi-touch detection algorithm using an efficient noise compensation technique for large mutual capacitance TSPs. The sources of noise are presented and analyzed. The algorithm includes the steps to overcome each source of noise. The algorithm begins with a calibration technique to overcome the TSP mutual capacitance variation. The algorithm also overcomes the shadow effect of a hand close to TSP and mutual capacitance variation by dynamic threshold calculations. Time and space filters are also used to filter out ambient noise. The experimental results were used to determine the system parameters to achieve the best performance.