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REFERENCE LINKING PLATFORM OF KOREA S&T JOURNALS
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Journal of the Institute of Electronics and Information Engineers
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The Institute of Electronics Engineers of Korea
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Volume & Issues
Volume 50, Issue 12 - Dec 2013
Volume 50, Issue 11 - Nov 2013
Volume 50, Issue 10 - Oct 2013
Volume 50, Issue 9 - Sep 2013
Volume 50, Issue 8 - Aug 2013
Volume 50, Issue 7 - Jul 2013
Volume 50, Issue 6 - Jun 2013
Volume 50, Issue 5 - May 2013
Volume 50, Issue 4 - Apr 2013
Volume 50, Issue 3 - Mar 2013
Volume 50, Issue 2 - Feb 2013
Volume 50, Issue 1 - Jan 2013
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An Emergency Management Architecture Using Personalized Emergency Policy for Smart Healthcare
Chun, Seung-Man ; Choi, Joo-Yeon ; Park, Jong-Tae ;
Journal of the Institute of Electronics and Information Engineers, volume 50, issue 11, 2013, Pages 3~11
DOI : 10.5573/ieek.2013.50.11.003
In smart healthcare service, the accurate and prompt emergency detection and notification are very critical to patients' lives. Since these detection and notification of emergency situation are usually performed by the medical staffs, it is difficult to simultaneously support many patients in real-time. This article presents a methodology for emergency bio-data transmission for smart healthcare using personalized emergency policy. It consists of three steps: In step 1, the bio-data is collected by wireless body area network. In step 2, the decision on emergency is made using personalized emergency policy. In step 3, the emergency message including the health condition information is converted between IEEE 11073 PHD message and HL7 CDA. By doing this, the emergency status of the individual bio-data collected from wireless body area network is detected automatically using personalized emergency policy. When the emergency is detected, the quick emergency rescue service can be provided to the patient by delivering to the emergency notification and the emergency bio-data. We have verified the service and functions of the proposed system architecture by realizing it.
Utilization of Rotational Beam Direction Patterns for Performance Enhancement of Cell Boundary UEs
Lee, Donghyun ; Sung, Wonjin ;
Journal of the Institute of Electronics and Information Engineers, volume 50, issue 11, 2013, Pages 12~20
DOI : 10.5573/ieek.2013.50.11.012
Even though extensive research results have been applied to wireless cellular systems to improve their capacity and coverage, severe performance degradation experienced in cell boundary areas still remains as a major limiting factor to prohibit further improvement of user equipment (UE) throughput. In the Long Term Evolution-Advanced (LTE-A) standard of the Third Generation Partnership Project (3GPP), Some advanced techniques have been introduced to overcome this "cell-edge problem", including coordinated multipoint transmission and reception (CoMP) and inter-cell interference coordination (ICIC). In this paper, we propose yet another strategy to improve the performance of low-tier UEs by using the concept of multiple beam direction patterns (BDPs). Such multiple BDPs can be implemented using multi-layer antenna arrays stacked vertically at base station (BS) sites to transmit signals in different main beam directions. In comparison to conventional three-sector antennas with a fixed beam pattern, the proposed methods makes signal transmission in a rotational fashion to significantly enhance the reception quality of UEs located near sector (or cell) edge areas, preventing the situation where certain UEs are marginally covered by the BS for the whole transmission time. Performance evaluation results show that the proposed scheme outperforms the conventional three-sector transmission by 171% in low 5% UEs in terms of the UE throughput.
Performance Analysis of Adaptive Modulation Based Incremental Hop Selection Scheme for Multi-Hop Networks
Lee, Bumsoo ; Kim, Dohoon ; Lee, Chungyong ;
Journal of the Institute of Electronics and Information Engineers, volume 50, issue 11, 2013, Pages 21~27
DOI : 10.5573/ieek.2013.50.11.021
This paper proposes an adaptive modulation based incremental hop selection scheme which improves network coverage in half-duplex multi-hop networks. The proposed scheme guarantees wide coverage through the operation of multi-hop network while preventing spectral efficiency loss due to the usage of multiple time phases in the half-duplex protocol. Also, we evaluate the average spectral efficiency performance over Nakagami-m fading channel. The simulation results show that the proposed scheme outperforms the existing schemes and the derived evaluation is valid.
A Study On The Eigen-properties of A 2-D Square Waveguide by the Krylov-Schur Iteration Method
Kim, Yeong Min ; Kim, Dongchool ; Lim, Jong Soo ;
Journal of the Institute of Electronics and Information Engineers, volume 50, issue 11, 2013, Pages 28~35
DOI : 10.5573/ieek.2013.50.11.028
The Krylov-Schur algorithm has been applied to reveal the eigen-properties of the wave guide having the square cross section. The eigen-matrix equation has been constructed from FEM with the basis function of the tangential edge-vectors of the triangular element. This equation has been treated firstly with Arnoldi decomposition to obtain a upper Hessenberg matrix. The QR algorithm has been carried out to transform it into Schur form. The several eigen values satisfying the convergent condition have appeared in the diagonal components. The eigen-modes for them have been calculated from the inverse iteration method. The wanted eigen-pairs have been reordered in the leading principle sub-matrix of the Schur matrix. This sub-matrix has been deflated from the eigen-matrix equation for the subsequent search of other eigen-pairs. These processes have been conducted several times repeatedly. As a result, a few primary eigen-pairs of TE and TM modes have been obtained with sufficient reliability.
Design of UWB Bandpass Filter using CRLH Transmission Line
Kim, Girae ;
Journal of the Institute of Electronics and Information Engineers, volume 50, issue 11, 2013, Pages 36~40
DOI : 10.5573/ieek.2013.50.11.036
A novel design method of ultra wideband bandpass filter using CRLH transmission line with Dumbell type DGS is presented in this paper. Defected Ground Structure and microstrip interdigital capacitor are used to design the ultra wideband (UWB) filter. CRLH transmission line has composite characteristics of low pass and high pass filter. As control of cutoff frequency of low pass and high pass response on CRLH transmission line, we can get characteristic of UWB filter. We designed and simulated for CRLH transmission lines with one, two, four, and eight cells. A UWB filter using four cells CRLH is designed and fabricated to verify the results. The characteristics of designed filter have center frequency of 5GHz and relative bandwidth of 88%.
A Study on Solar Cell Wafer Cleaning using Ozonate Water
Moon, Se-Ho ; Chai, Sang-Hoon ; Son, Young Su ;
Journal of the Institute of Electronics and Information Engineers, volume 50, issue 11, 2013, Pages 43~49
DOI : 10.5573/ieek.2013.50.11.043
We have studied on ozonate water cleaning mechanisms to apply in manufacturing process of 156 mm silicon wafer which is used in the solar cell fabrication. We have analyzed contamination sources on wafer surface which causes poor quality and performance of products in fabrication process, and examined cleaning process using ozonate water to eliminate it. Using this novel technology particles are removed over 94%, and remained organic materials are removed more over 45%.
Design of a High Throughput Parallel Turbo Decoder
Lee, Won-Ho ; Park, Heemin ; Rim, Chong S. ;
Journal of the Institute of Electronics and Information Engineers, volume 50, issue 11, 2013, Pages 50~57
DOI : 10.5573/ieek.2013.50.11.050
This paper provides a design of high-throughput parallel turbo decoder that is able to decode several packets of various length simultaneously. For high-speed communications, designing of Turbo decoder as parallel structures reduces the long decoding time caused by iterative turbo decode way. Also, by employing the double buffer structure for input and output packets improves the decoder throughput by enabling continuous decoding. Because parallel turbo decoder is designed to be able to decode the packet of the longest length, there exist idle PE's(Processing Element) in the case of decoding packets of short length. The main idea of this paper is to increase the utilization of PE's in parallel Turbo decoder and to improve the decoder throughput by using the idle PE's immediately for the subsequent packets decoding. For this, the control is necessary to enable the concurrent decoding of several short packets and we propose the method of this control. Applying the proposed method, we implemented Turbo Decoder with 32 PE's that can decode packets of 6144 bits maximum. Compared to the conventional Turbo decoder, although the area was increased about 16%, the decoder throughput was improved 28 times for short packets.
Design of Low Power Optical Channel for DisplayPort Interface
Seo, Jun-Hyup ; Park, In-Hang ; Jang, Hae-Jong ; Bae, Gi-Yeol ; Kang, Jin-Ku ;
Journal of the Institute of Electronics and Information Engineers, volume 50, issue 11, 2013, Pages 58~63
DOI : 10.5573/ieek.2013.50.11.058
This paper presents a transceiver design for DisplayPort interface using an optical channel. By converting the electronic channel to the optical channel, the DisplayPort's main channel can provide a high-speed data transmission for long distance. The design converting the electronic channel to the optical channel in the main channel and AUX channel of the DisplayPort is presented in this paper. Futhermore, the HPD signal transmission by using AUX channel is proposed. In order to minimize power consumption, this paper also proposed a method of controlling the TX block in the main link. The proposed system is designed by a FPGA and an optical module. The FPGA used 651 ALUT(adaptive look-up table)s, 511 resisters and 324 block memory bits. The maximum operating rate of the FPGA is 250MHz. With the proposed power control scheme, 740mW of power dissipation reduction can be achieved at the main link optical TX module.
Design of a CMOS Image Sensor Based on a 10-bit Two-Step Single-Slope ADC
Hwang, Inkyung ; Kim, Daeyun ; Song, Minkyu ;
Journal of the Institute of Electronics and Information Engineers, volume 50, issue 11, 2013, Pages 64~69
DOI : 10.5573/ieek.2013.50.11.064
In this paper, a high-speed CMOS Image Sensor (CIS) based on a 10-bit two-step single-slope A/D converter is proposed. The A/D converter is composed of both a 5-bit coarse ADC and a 6-bit fine ADC, and the conversion speed is 10 times faster than that of the single-slope A/D converter. In order to have a small noise characteristics, further, a Digital Correlated Double Sampling(D-CDS) is also discussed. The proposed A/D converter has been fabricated with 0.13um 1-poly 4-metal CIS process, and it has a QVGA(
) resolution. The fabricated chip size is
, and the power consumption is about 35mW at 3.3V supply voltage. The measured conversion speed is 10us, and the frame rate is 220 frames/s.
A Low Area and High Efficiency SMPS with a PWM Generator Based on a Pseudo Relaxation-Oscillating Technique
Lim, Ji-Hoon ; Wee, Jae-Kyung ; Song, Inchae ;
Journal of the Institute of Electronics and Information Engineers, volume 50, issue 11, 2013, Pages 70~77
DOI : 10.5573/ieek.2013.50.11.070
We suggest a low area and high efficiency switched-mode power supply (SMPS) with a pulse width modulation (PWM) generator based on a pseudo relaxation-oscillating technique. In the proposed circuit, the PWM duty ratio is determined by the voltage slope control of an internal capacitor according to amount of charging current in a PWM generator. Compared to conventional SMPSs, the proposed control method consists of a simple structure without the filter circuits needed for an analog-controlled SMPS or the digital compensator used by a digitally-controlled SMPS. The proposed circuit is able to operate at switching frequency of 1MHz~10MHz, as this frequency can be controlled from the selection of one of the internal capacitors in a PWM generator. The maximum current of the core circuit is 2.7 mA, and the total current of the entire circuit including output buffer driver is 15 mA at 10 MHz switching frequency. The proposed SMPS has a simulated maximum ripple voltage of 7mV. In this paper, to verify the operation of the proposed circuit, we performed simulation using Dongbu Hitek BCD
technology and measured the proposed circuit.
8.1 Gbps High-Throughput and Multi-Mode QC-LDPC Decoder based on Fully Parallel Structure
Jung, Yongmin ; Jung, Yunho ; Lee, Seongjoo ; Kim, Jaeseok ;
Journal of the Institute of Electronics and Information Engineers, volume 50, issue 11, 2013, Pages 78~89
DOI : 10.5573/ieek.2013.50.11.078
This paper proposes a high-throughput and multi-mode quasi-cyclic (QC) low-density parity-check (LDPC) decoder based on a fully parallel structure. The proposed QC-LDPC decoder employs the fully parallel structure to provide very high throughput. The high interconnection complexity, which is the general problem in the fully parallel structure, is solved by using a broadcasting-based sum-product algorithm and proposing a low-complexity cyclic shift network. The high complexity problem, which is caused by using a large amount of check node processors and variable node processors, is solved by proposing a combined check and variable node processor (CCVP). The proposed QC-LDPC decoder can support the multi-mode decoding by proposing a routing-based interconnection network, the flexible CCVP and the flexible cyclic shift network. The proposed QC-LDPC decoder is operated at 100 MHz clock frequency. The proposed QC-LDPC decoder supports multi-mode decoding and provides 8.1 Gbps throughput for a (1944, 1620) QC-LDPC code.
Design of a Realtime Stereo Vision System using Adaptive Support-weight
Ryu, Donghoon ; Park, Taegeun ;
Journal of the Institute of Electronics and Information Engineers, volume 50, issue 11, 2013, Pages 90~98
DOI : 10.5573/ieek.2013.50.11.090
The stereo system based on local matching is very popular due to its algorithmic simplicity, however it is limited to apply to various applications because it shows poor quality with low matching rates. In this paper, we propose and design a realtime stereo system based on an adaptive support-weight and the system shows low error rates and realtime performance. Generally, in the adaptive support-weight algorithm the intermediate computing results can not be reused to reduce the number of computations. In this research we modify the scheduling to reuse the intermediate results for the better performance by processing rows and columns separately. The nonlinear functions such as exponential or arc tangent have been designed with piecewise linear and step functions by empirical simulations and error analysis. The proposed architecture is composed of 9 processing elements for realtime performance. The proposed stereo system has been designed and synthesized using Donbu Hitek 0.18um standard cell library and can run up to 350Mhz operation frequency (33 frames per second) with 424K gates.
CAN Data Compression Using DLC and Compression Area Selection
Wu, Yujing ; Chung, Jin-Gyun ;
Journal of the Institute of Electronics and Information Engineers, volume 50, issue 11, 2013, Pages 99~107
DOI : 10.5573/ieek.2013.50.11.099
Controller area network (CAN) was designed for multiplexing communication between electronic control units (ECUs) in vehicles and thus for decreasing the overall wire harness. The increasing number of ECUs causes the CAN bus overloaded and consequently the error probability of data transmission increases. Since the time duration for the data transmission is proportional to CAN frame length, it is desirable to reduce the frame length. In this paper, a CAN message compression method is proposed using Data Length Code (DLC) and compression area selection algorithm to reduce the CAN frame length and the error probability during the transmission of CAN messages. By the proposed method, it is not needed to predict the maximum value of the difference in successive CAN messages as opposed to other compression methods. Also, by the use of DLC, we can determine whether the received CAN message has been compressed or not without using two ID's as in conventional methods. By simulations using actual CAN data, it is shown that the CAN transmission data is reduced up to 52 % by the proposed method, compared with conventional methods. By using an embedded test board, it is shown that 64bit EMS CAN data compression can be performed within 0.16ms and consequently the proposed algorithm can be used in automobile applications without any problem.
A Deflection Routing using Location Based Priority in Network-on-Chip
Nam, Moonsik ; Han, Tae Hee ;
Journal of the Institute of Electronics and Information Engineers, volume 50, issue 11, 2013, Pages 108~116
DOI : 10.5573/ieek.2013.50.11.108
The input buffer in Network on Chip (NoC) router plays a key role in on-chip-network performance, which is utilized in flow control and virtual channel. However, increase in area and power due to input buffers as the network size gets larger is becoming severe. To solve this problem, a bufferless deflection routing without input buffer was suggested. Since the bufferless deflection routing shows poor performance at high network load, other approaches which combine the deflection routing with small size side buffers were also proposed. Nonetheless these new methods still show deficiencies caused by frequent path collisions. In this paper, we propose a modified deflection routing technique using a location based priority. In comparison with existing deflection routers, experimental results show improvement by 12% in throughput with only 3% increase in area.
Low Power Embedded Memory Design for Viterbi Decoder with Energy Optimized Write Operation
Tang, Hoyoung ; Shin, Dongyeob ; Song, Donghoo ; Park, Jongsun ;
Journal of the Institute of Electronics and Information Engineers, volume 50, issue 11, 2013, Pages 117~123
DOI : 10.5573/ieek.2013.50.11.117
By exploiting the regular read and write access patterns of embedded SRAM memories inside Viterbi decoder, the memory architecture can be efficiently modified to reduce the power consumption of write operation. According to the experimental results with 65nm CMOS process, the proposed embedded memory used for Viterbi decoder achieves 30.84% of power savings with 8.92% of area overhead compared to the conventional embedded SRAM approaches.
MPW Chip Implementation and Verification of High-performance Vector Inner Product Calculation Circuit for SVM-based Object Recognition
Shin, Jaeho ; Kim, Soojin ; Cho, Kyeongsoon ;
Journal of the Institute of Electronics and Information Engineers, volume 50, issue 11, 2013, Pages 124~129
DOI : 10.5573/ieek.2013.50.11.124
This paper proposes a high-performance vector inner product calculation circuit for real-time object recognition based on SVM algorithm. SVM algorithm shows a higher detection rate than other object recognition algorithms. However, it requires a huge amount of computational efforts. Since vector inner product calculation is one of the major operations of SVM algorithm, it is important to implement a high-performance vector inner product calculation circuit for real-time object recognition capability. The proposed circuit adopts the pipeline architecture with six stages to increase the operating speed and makes it possible to recognize objects in real time based on SVM. The proposed circuit was described in Verilog HDL at RTL. For silicon verification, an MPW chip was fabricated using TSMC 180nm standard cell library. The operation of the implemented MPW chip was verified on the test board with test application software developed for the chip verification.
Analog Front-End Circuit Design for Bio-Potential Measurement
Lim, Shin-Il ;
Journal of the Institute of Electronics and Information Engineers, volume 50, issue 11, 2013, Pages 130~137
DOI : 10.5573/ieek.2013.50.11.130
This paper presents analog front-end(AFE) circuits for bio-potential measurement. The proposed AFE is composed of IA(instrument amplifier), BPF(band-pass filter), VGA(variable gain amplifier) and SAR(successive approximation register) type ADC. The low gm(LGM) circuits with current division technique and Miller capacitance with high gain amplifier enable IA to implement on-chip AC-coupling without external passive components. Spilt capacitor array with capacitor division technique and asynchronous control make the 12-b ADC with low power consumption and small die area. The total current consumption of proposed AFE is 6.3uA at 1.8V.
Resilient Routing Protocol Scheme for 6LoWPAN
Woo, Yeon Kyung ; Park, Jong Tae ;
Journal of the Institute of Electronics and Information Engineers, volume 50, issue 11, 2013, Pages 141~149
DOI : 10.5573/ieek.2013.50.11.141
IETF 6LoWPAN standard technique has been studied in IoT environment to support the IPv6 packet communication. 6LoWPAN protocol for transmission of packets mainly in the AODV routing protocol and a variety of extended techniques have been investigated. In particular, consisting of nodes with limited resources in a network error occurs when the 6LoWPAN reliable data transfer and fast routing method is needed. To this end, in this paper, we propose resilient routing protocol and extension of IETF LOAD algorithm, for optimal recovery path, More specifically, the optimal recovery path setup algorithm, signal flow, and detailed protocols for the verification of the reliability of packet transmission mathematical model is presented. The proposed protocol techniques to analyze the performance of the NS-3 performance through the simulation results that is end-to-end delay, throughput, packet delivery fraction and control packet overhead demonstrated excellence in comparison with existing LOAD.
Development of Intelligent Learning Tool based on Human eyeball Movement Analysis for Improving Foreign Language Competence
Shin, Jihye ; Jang, Young-Min ; Kim, Sangwook ; Mallipeddi, Rammohan ; Bae, Jungok ; Choi, Sungmook ; Lee, Minho ;
Journal of the Institute of Electronics and Information Engineers, volume 50, issue 11, 2013, Pages 153~161
DOI : 10.5573/ieek.2013.50.11.153
Recently, there has been a tremendous increase in the availability of educational materials for foreign language learning. As part of this trend, there has been an increase in the amount of electronically mediated materials available. However, conventional educational contents developed using computer technology has provided typically one-way information, which is not the most helpful thing for users. Providing the user's convenience requires additional off-line analysis for diagnosing an individual user's learning. To improve the user's comprehension of texts written in a foreign language, we propose an intelligent learning tool based on the analysis of the user's eyeball movements, which is able to diagnose and improve foreign language reading ability by providing necessary supplementary aid just when it is needed. To determine the user's learning state, we correlate their eye movements with findings from research in cognitive psychology and neurophysiology. Based on this, the learning tool can distinguish whether users know or do not know words when they are reading foreign language sentences. If the learning tool judges a word to be unknown, it immediately provides the student with the meaning of the word by extracting it from an on-line dictionary. The proposed model provides a tool which empowers independent learning and makes access to the meanings of unknown words automatic. In this way, it can enhance a user's reading achievement as well as satisfaction with text comprehension in a foreign language.
3D Model Construction from Image Scanning without Iteration or SVD
Han, Youngmo ;
Journal of the Institute of Electronics and Information Engineers, volume 50, issue 11, 2013, Pages 165~170
DOI : 10.5573/ieek.2013.50.11.165
When we build up a 3D model from the given 2D images, linear algorithms are often used to reduce computational cost or for initialization of nonlinear algorithms. However, contemporary linear algorithms have apparently linear structures, but virtually they are implemented using SVD. The SVD is also implemented using numerical analysis algorithms that need initialization. Moreover, solutions using SVD are more difficult to analyze than closed-form solutions. To avoid from such inconvenient numerical analysis algorithms of the contemporary methods and for convenient analysis of solutions, this paper proposes a convenient linear method that produces a closed-form solution.
Comparison of Routh-Hurwitz and Absolute Stability Criteria in Application to Scaled Telerobotics Systems
Gaponov, Igor ; Cho, Hyun Chan ; Jeon, Hong-Tae ;
Journal of the Institute of Electronics and Information Engineers, volume 50, issue 11, 2013, Pages 171~179
DOI : 10.5573/ieek.2013.50.11.171
This paper presents a comparative study on application of Routh-Hurwitz and Llewellyn absolute stability criteria to a scaled telerobotic system. The dynamic equations of the telerobotic system are given, and the transfer function of the system is obtained for further stability analysis. The stable margins of controller gains are obtained using both stability analysis methods, and the differences in the results are described and explained. The paper is concluded by a numerical example verifying performed stability analysis.
Tracking Method of Inclination-dependent 2-axis Solar Tracker
Hong, Jung-Hoon ; Kim, Eun-Sung ;
Journal of the Institute of Electronics and Information Engineers, volume 50, issue 11, 2013, Pages 180~187
DOI : 10.5573/ieek.2013.50.11.180
The dinger in solar generation is the amount of sunlight which the solar cells absorb. Various types of solar trackers, which rotate themselves in order to make the solar cells face the sun as much as possible, have been developed, and especially the method of tracking with two axes has greatly contributed in increasing the generation amount at work sites. Among theses 2-axis solar trackers, the inclination-dependent 2-axis solar tracker are widely utilized for its advantages of requiring less initial investment and easy maintenance due to a solid structure. However, the drawback is that the generation efficiency is relatively low because of the structural restriction that limits the rotation angle, thus making it less efficient when tracking the sun. This paper proposes a method to increase the generation efficiency of the inclination-dependent 2-axis solar tracker. It also contains the derived equations needed for precise controlling along with a method to keep tracking with the other axis even when one has reached its angle limit. To confirm that the proposed method increases the amount of incidence onto the solar cells, formulas needed for operation on the proposed method and tracking the exact position of the sun are derived, and applying this to the quarterly data of Korea Astronomy and Space Science Institute it shows maximum over 11.1% more incidence compared to existing methods.
Pulmonary Vessels Segmentation and Refinement On the Chest CT Images
Kim, Jung-Chul ; Cho, Joon-Ho ; Hwang, Hyung-Soo ;
Journal of the Institute of Electronics and Information Engineers, volume 50, issue 11, 2013, Pages 188~194
DOI : 10.5573/ieek.2013.50.11.188
In this paper, we proposed a new method for pulmonary vessels image segmentation and refinement from pulmonary image. Proposed method consist of following five steps. First, threshold estimation is performed by polynomial regression analysis of histogram variation rate of the pulmonary image. Second, segmentation of pulmonary vessels object is performed by density-based segmentation method based on estimated threshold in first step. Third, 2D connected component labeling method is applied to segmented pulmonary vessels. The seed point of both side diaphragms is determined by eccentricity and size of component. Fourth step is diaphragm extraction by 3D region growing method at the determined seed point. Finally, noise cancelation of pulmonary vessels image is performed by 3D connected component labeling method. The experimental result is showed accurately pulmonary vessels image segmentation, the diaphragm extraction and the noise cancelation of the pulmonary vessels image.
Sequential Nonlinear Recurrence Quantification Analysis of Attentional Visual Evoked Potential
Lee, Byung-Chae ; Yoo, Sun-Kook ; Kim, Hye-Jin ;
Journal of the Institute of Electronics and Information Engineers, volume 50, issue 11, 2013, Pages 195~205
DOI : 10.5573/ieek.2013.50.11.195
The analysis of electroencephalographic signal associated with the attention is essential for the understanding of human cognition. In this paper, the characteristic differences between the attention and inattention status in the brain were inspected by nonlinear analysis. The recurrence quantification analysis was applied to the relatively small number of samples of evoked potential having time varying characteristics, where the recurrence plot (RP), the color recurrence plot (CRP), and mean and time-sequential trend parameters were extracted. The dimension and the time delay in phase transformation can be determined by the paired set of extracted parameters. It is observed from RP, CRP, and parameters that the brain dynamics in attention is more complex than that in the inattention, as well as the synchronized brain response is stable in the mean sense but locally time varying. It is feasible that the non-linear analysis method can be useful for the analysis of complex brain dynamics associated during visual attentional task.
The Design of Feature Selection Classifier based on Physiological Signal for Emotion Detection
Lee, JeeEun ; Yoo, Sun K. ;
Journal of the Institute of Electronics and Information Engineers, volume 50, issue 11, 2013, Pages 206~216
DOI : 10.5573/ieek.2013.50.11.206
The emotion plays a critical role in human's daily life including learning, action, decision and communication. In this paper, emotion discrimination classifier is designed to reduce system complexity through reduced selection of dominant features from biosignals. The photoplethysmography(PPG), skin temperature, skin conductance, fontal and parietal electroencephalography(EEG) signals were measured during 4 types of movie watching associated with the induction of neutral, sad, fear joy emotions. The genetic algorithm with support vector machine(SVM) based fitness function was designed to determine dominant features among 24 parameters extracted from measured biosignals. It shows maximum classification accuracy of 96.4%, which is 17% higher than that of SVM alone. The minimum error features selected are the mean and NN50 of heart rate variability from PPG signal, the mean of PPG induced pulse transit time, the mean of skin resistance, and
frequency band powers of parietal EEG. The combination of parietal EEG, PPG, and skin resistance is recommendable in high accuracy instrumentation, while the combinational use of PPG and skin conductance(79% accuracy) is affordable in simplified instrumentation.
Study of Program and Erase Characteristics for the Elliptic GAA SONOS Cell in 3D NAND Flash Memory
Choi, Deuk-Sung ; Lee, Seung-Heui ; Park, Sung-Kye ;
Journal of the Institute of Electronics and Information Engineers, volume 50, issue 11, 2013, Pages 219~225
DOI : 10.5573/ieek.2013.50.11.219
Program and erase characteristics of the elliptic gate all around (e-GAA) SONOS cell have been studied as the variation of eccentricity of the channel. An analytic program and erase model for the elliptic GAA SONOS cell is proposed and evaluated. The model shows that the ISPP (incremental-step-pulse programming) property is changed non-linearly as the eccentricity of the e-GAA SONOS cell is increased. It is differently from the well known linear relationship for that of 2D SONOS and even 3D circular SONOS cell with program bias. We can find that the simulation results of ISPP characteristics are in accord with the experimental data.
Laver(Kim) Thickness Measurement and Control System Design
Lee, Bae-Kyu ; Choi, Young-Il ; Kim, Jung-Hwa ;
Journal of the Institute of Electronics and Information Engineers, volume 50, issue 11, 2013, Pages 226~233
DOI : 10.5573/ieek.2013.50.11.226
In this study, In Laver's automatic drying device, laver thickness measurement and control devices that are associated with. Disconnect the water and steam, after put a certain amount of the mixture(water and laver) in the mold. In process, Laver of the size and thickness (weight) to determine, constant light source to detect and image LED Lamp occur Vision Sensor (Camera) prepare, then the values of these state of the image is transmitted in real time embedded computers. Built-in measurement and control with the purpose of the application of each of the channels separately provided measurements are displayed on a monitor, And servo signals sent to each of the channels and it become so set function should be. In this paper, the laver drying device, prior to the laver thickness measurement and control devices that rely on the experience of existing workers directly laver manually adjust the thickness of the lever, but the lever by each channel relative to the actuator by installing was to improve the quality. In addition, The effect of productivity gains and labor savings are.