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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 51, Issue 12 - Dec 2014
Volume 51, Issue 11 - Nov 2014
Volume 51, Issue 10 - Oct 2014
Volume 51, Issue 9 - Sep 2014
Volume 51, Issue 8 - Aug 2014
Volume 51, Issue 7 - Jul 2014
Volume 51, Issue 6 - Jun 2014
Volume 51, Issue 5 - May 2014
Volume 51, Issue 4 - Apr 2014
Volume 51, Issue 3 - Mar 2014
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Volume 51, Issue 1 - Jan 2014
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I/Q Imbalance Compensation Method for the Direct Conversion Receiver with Low Pass Filter Mismatch
Yun, Seonhui ; Ahn, Jaemin ;
Journal of the Institute of Electronics and Information Engineers, volume 51, issue 11, 2014, Pages 3~10
DOI : 10.5573/ieie.2014.51.11.003
Direct conversion receiver(DCR) gets noticed for integration and cost reduction of wireless communication systems instead of the heterodyne receiver which uses complex filter. But DCR has several factors in performance degradation. One of them is I/Q imbalance phenomenon, that is amplitude and phase mismatch between real and imaginary part of receiver. Accordingly, researches are being carried to improve the I/Q imbalance problem. However, the tendency of the broaden bandwidth of communication systems, low pass filter(LPF) mismatch problem affects severely in I/Q mismatch phenomenon at the DCR. To study this problem, we generated 10MHz broadband signal and shifted it
from the center frequency. The signal is affected by LPF mismatch and it appears as frequency selective distortion. Thus, LPF mismatch model is added to I/Q imbalance model which conventionally dealt with amplitude and phase mismatches. In addition, we proposed the compensation method for each factors of mismatch. As the simulation results, the proposed I/Q mismatch compensator resolves the frequency selective distortion which occurred by the existing LPF mismatch.
Multi-Channel Pipelining for Energy Efficiency and Delay Reduction in Wireless Sensor Network
Lee, Yoh-Han ; Kim, Daeyoung ;
Journal of the Institute of Electronics and Information Engineers, volume 51, issue 11, 2014, Pages 11~18
DOI : 10.5573/ieie.2014.51.11.011
Most of the energy efficient MAC protocols for wireless sensor networks (WSNs) are based on duty cycling in a single channel and show competitive performances in a small number of traffic flows; however, under concurrent multiple flows, they result in significant performance degradation due to contention and collision. We propose a multi-channel pipelining (MCP) method for convergecast WSN in order to address these problems. In MCP, a staggered dynamic phase shift (SDPS) algorithms devised to minimize end-to-end latency by dynamically staggering wake-up schedule of nodes on a multi-hop path. Also, a phase-locking identification (PLI) algorithm is proposed to optimize energy efficiency. Based on these algorithms, multiple flows can be dynamically pipelined in one of multiple channels and successively handled by sink switched to each channel. We present an analytical model to compute the duty cycle and the latency of MCP and validate the model by simulation. Simulation evaluation shows that our proposal is superior to existing protocols: X-MAC and DPS-MAC in terms of duty cycle, end-to-end latency, delivery ratio, and aggregate throughput.
A Hybrid Error Generation Algorithm Using Confidence Intervals on Signal Constellation
Oh, Kil Nam ;
Journal of the Institute of Electronics and Information Engineers, volume 51, issue 11, 2014, Pages 19~25
DOI : 10.5573/ieie.2014.51.11.019
For effective updating a blind equalizer, we propose the adaptive algorithm having faster convergence speed required for initial equalization and satisfying low error level required in steady-state while having a gradual and reversible switching characteristics between initial stage and steady-state. The proposed method presents three criteria to distinguish the state of equalized signal, according to the criteria, differently updates the equalizer by using the hybrid error generation algorithm generating one of the three errors. Wherein as the criteria to determine the state of the equalized signal the confidence intervals on the signal constellation are used, an error is generated alternatively according to the confidence interval where equalizer output lies, and the equalizer is updated by, we got convergence quickly and to lower error level. In order to verify the usefulness of the proposed idea, simulation results were compared to the performance of conventional methods.
Link-level Performance of SC-FDM using a Turbo Equalizer
Lee, Joongho ; Lim, Jaehong ; Yoon, Seokhyun ;
Journal of the Institute of Electronics and Information Engineers, volume 51, issue 11, 2014, Pages 26~32
DOI : 10.5573/ieie.2014.51.11.026
Single-Carrier Frequency division multiplexing (SC-FDM) has been selected for the uplink transmission technique in 3GPP-LTE since it has an advantage of low peak-to-average power ratio (PAPR) in user's perspective. The receiver typically uses a frequency domain equalizer, which, however, suffers from noise boost and/or residual ISI especially when the channel has deep nulls. In this paper, we propose using turbo equalizer to mitigate such a problem. We provide link level performance comparison and an insight into how many iteration is needed for reasonable performance and complexity.
The Optimal Number of Transmit Antennas Maximizing Energy Efficiency in Multi-user Massive MIMO Downlink System with MRT Precoding
Lee, Jeongsu ; Han, Yonggue ; Lee, Chungyong ;
Journal of the Institute of Electronics and Information Engineers, volume 51, issue 11, 2014, Pages 33~39
DOI : 10.5573/ieie.2014.51.11.033
We propose an optimal number of transmit antennas which maximizes energy-efficiency (EE) in multi-user massive multiple-input multiple-output (MIMO) downlink system with the maximal ratio transmission (MRT) precoding. With full channel state information at the transmitter (CSIT), we find a closed form solution by partial differential function with proper approximations using average channel gain, independence of individual channels, and average path loss. With limited feedback, we get a solution numerically by the bisection with approximations in the same manner, and analyze an effect of feedback bits on the optimal number of transmit antennas. Simulation results show that the optimal numbers of transmit antenna getting from proposed closed form solution and exhaustive search are nearly same.
Stepwise Parameter Estimation Using Pole-Zero Model of Pade Approximation for Radar Signal Active Cancellation
Han, Yonggue ; Lim, Seongmok ; Sim, Dongkyu ; Lee, Chungyong ;
Journal of the Institute of Electronics and Information Engineers, volume 51, issue 11, 2014, Pages 40~46
DOI : 10.5573/ieie.2014.51.11.040
We introduce a parameter estimation algorithm by using pole-zero coefficients of Pade approximation for radar active cancellation. Proposed scheme is based on relation among pole-zero coefficients of Pade approximation, parameters, and samples of received signal. A closed form solution for parameter estimation is achieved with a few samples of received signal and a simple comparison. Also, stepwise estimation algorithm is proposed to suppress beat effect which is occurred by active cancellation over long time with imperfectly estimated parameters. Simulation results show that proposed scheme performs faster radar active cancellation with lower computational complexity than the conventional schemes.
Pade Approximation Based Adaptive Parameter Estimation for Radar Signal Active Cancellation
Lee, Sanggeun ; Lim, Seongmok ; Sim, Dongkyu ; Lee, Chungyong ;
Journal of the Institute of Electronics and Information Engineers, volume 51, issue 11, 2014, Pages 47~53
DOI : 10.5573/ieie.2014.51.11.047
We propose a parameter estimation algorithm for radar signal active cancellation based on the Pade approximation that requires much less samples than the conventional MLE scheme. We also verify that the radar signal with time-variant center frequency can be estimated with proposed algorithm by renovating the center frequency. We present simulation results for radar signal active cancellation to show the accuracy of estimated signal using proposed algorithm by calculating the ratio of RMSE of estimated signal to amplitude of hostile radar signal.
Design Optimization of CML-Based High-Speed Digital Circuits
Jang, Ikchan ; Kim, Jintae ; Kim, SoYoung ;
Journal of the Institute of Electronics and Information Engineers, volume 51, issue 11, 2014, Pages 57~65
DOI : 10.5573/ieie.2014.51.11.057
This paper presents a framework that is based on a reconfigurable macro-model of current-mode logic (CML) high-speed digital circuits enabling equation-based design optimization. The proposed macro-model is compatible with geometric programming, thereby enabling constraint-driven top-level power optimization. The proposed optimization framework is applied to a design of CML based serial-link transmitter with user-defined design specifications as an example of high speed digital circuits using 45nm and 90nm CMOS technology. The proposed optimization framework can derive a design with optimal power efficiency for given transistor technology nodes.
Design of Efficient Gradient Orientation Bin and Weight Calculation Circuit for HOG Feature Calculation
Kim, Soojin ; Cho, Kyeongsoon ;
Journal of the Institute of Electronics and Information Engineers, volume 51, issue 11, 2014, Pages 66~72
DOI : 10.5573/ieie.2014.51.11.066
Histogram of oriented gradient (HOG) feature is widely used in vision-based pedestrian detection. The interpolation is the most important technique in HOG feature calculation to provide high detection rate. In interpolation technique of HOG feature calculation, two nearest orientation bins to gradient orientation for each pixel and the corresponding weights are required. In this paper, therefore, an efficient gradient orientation bin and weight calculation circuit for HOG feature is proposed. In the proposed circuit, pre-calculated values are defined in tables to avoid the operations of tangent function and division, and the size of tables is minimized by utilizing the characteristics of tangent function and weights for each gradient orientation. Pipeline architecture is adopted to the proposed circuit to accelerate the processing speed, and orientation bins and the corresponding weights for each pixel are calculated in two clock cycles by applying efficient coarse and fine search schemes. Since the proposed circuit calculates gradient orientation for each pixel with the interval of
and determines both orientation bins and weights required in interpolation technique, it can be utilized in HOG feature calculation to support interpolation technique to provide high detection rate.
FPGA Implementation of Levenverg-Marquardt Algorithm
Lee, Myung-Jin ; Jung, Yong-Jin ;
Journal of the Institute of Electronics and Information Engineers, volume 51, issue 11, 2014, Pages 73~82
DOI : 10.5573/ieie.2014.51.11.073
The LM algorithm is used in solving the least square problem in a non linear system, and is used in various fields. However, in cases the applied field's target functionis complicated and high-dimensional, it takes a lot of time solving the inner matrix and vector operations. In such cases, the LM algorithm is unsuitable in embedded environment and requires a hardware accelerator. In this paper, we implemented the LM algorithm in hardware. In the implementation, we used pipeline stages to divide the target function operation, and reduced the period of data input of the matrix and vector operations in order to accelerate the speed. To measure the performance of the implemented hardware, we applied the refining fundamental matrix(RFM), which is a part of 3D reconstruction application. As a result, the implemented system showed similar performance compared to software, and the execution speed increased in a product of 74.3.
Topology Design for Energy/Latency Optimized Application-specific Hybrid Optical Network-on-Chip (HONoC)
Cui, Di ; Lee, Jae Hoon ; Kim, Hyun Joong ; Han, Tae Hee ;
Journal of the Institute of Electronics and Information Engineers, volume 51, issue 11, 2014, Pages 83~93
DOI : 10.5573/ieie.2014.51.11.083
It is a widespread concern that electrical interconnection based network-on-chip (NoC) will ultimately face the limitation in communication bandwidth, transmission latency and power consumption in the near future. With the development of silicon photonics technology, a hybrid optical network-on-chip (HONoC) which embraces both electrical- and optical interconnect, is emerging as a promising solution to overcome these problems. Today's leading edge systems-on-chips (SoCs) comprise heterogeneous many-cores for higher energy efficiency, therefore, extended study beyond regular topology based NoC is required. This paper proposes an energy and latency optimization topology design technique for HONoC taking into account the traffic characteristics of target applications. The proposed technique is implemented with genetic algorithm and simulation results show the reduction by 13.84% in power loss and 28.14% in average latency, respectively.
A Class-C type Wideband Current-Reuse VCO With 2-Step Auto Amplitude Calibration(AAC) Loop
Kim, Dongyoung ; Choi, Jinwook ; Lee, Dongsoo ; Lee, Kang-Yoon ;
Journal of the Institute of Electronics and Information Engineers, volume 51, issue 11, 2014, Pages 94~100
DOI : 10.5573/ieie.2014.51.11.094
In this paper, a design of low power Current-Reuse Voltage Controlled Oscillator (VCO) which has wide tuning range about 1.95 GHz ~ 3.15 GHz is presented. Class-C type is applied to improve phase noise and 2-Step Auto Amplitude Calibration (AAC) is used for minimizing the imbalance of differential VCO output voltage which is main issue of Current-Reuse VCO. The mismatch of differential VCO output voltage is presented about 1.5mV ~ 4.5mV. This mismatch is within 0.6 % compared with VCO output voltage. Proposed Current-Reuse VCO is designed using CMOS
process. Supply voltage is 1.2 V and current consumption is 2.6 mA at center frequency. The phase noise is -116.267 dBc/Hz at 2.3GHz VCO frequency at 1MHz offset. The layout size is
A CMOS RF Power Detector Using an AGC Loop
Lee, Dongyeol ; Kim, Jongsun ;
Journal of the Institute of Electronics and Information Engineers, volume 51, issue 11, 2014, Pages 101~106
DOI : 10.5573/ieie.2014.51.11.101
This paper presents a wide dynamic range radio-frequency (RF) root-mean-square (RMS) power detector using an automatic gain control (AGC) loop. The AGC loop consists of a variable gain amplifier (VGA), RMS conversion block and gain control block. The VGA exploits dB-linear gain characteristic of the cascade VGA. The proposed circuit utilizes full-wave squaring and generates a DC voltage proportional to the RMS of an input RF signal. The proposed RMS power detector operates from 500MHz to 5GHz. The detecting input signal range is from 0 dBm to -70 dBm or more with a conversion gain of -4.53 mV/dBm. The proposed RMS power detector is designed in a 65-nm 1.2-V CMOS process, and dissipates a power of 5 mW. The total active area is
A Design of Voltage Controlled Oscillator and High Speed 1/4 Frequency Divider using 65nm CMOS Process
Lee, Jongsuk ; Moon, Yong ;
Journal of the Institute of Electronics and Information Engineers, volume 51, issue 11, 2014, Pages 107~113
DOI : 10.5573/ieie.2014.51.11.107
A VCO (Voltage Controlled Oscillator) and a divide-by-4 high speed frequency divider are implemented using 65nm CMOS technology for 60GHz wireless communication system. The mm-wave VCO was designed by NMOS cross-coupled LC type using current source. The architecture of the divide-by-4 high speed frequency divider is differential ILFD (Injection Locking Frequency Divider) with varactor to control frequency range. The frequency divider also uses current sources to get good phase noise characteristics. The measured results show that the VCO has 64.36~67.68GHz tuning range and the frequency divider divides the VCO output by 4 exactly. The high output power of 5.47~5.97dBm from the frequency divider is measured. The phase noise of the VCO including the frequency divider are -77.17dBc/Hz at 1MHz and -110.83dBc/Hz at 10MHz offset frequency. The power consumption including VCO is 38.4mW with 1.2V supply voltage.
Efficient Non-overlapping Aircraft Datablock Relocation Algorithm
Jeong, Jae Hyup ; Won, In Su ; Yang, Hun Jun ; Jeong, Dong Seok ;
Journal of the Institute of Electronics and Information Engineers, volume 51, issue 11, 2014, Pages 117~126
DOI : 10.5573/ieie.2014.51.11.117
In this paper, we propose an efficient algorithm which can relocate the datablock of an aircraft when it is overlapped. If the datablock which represents the aircraft information in the control display is overlapped, relocation without overlapping is necessary because it is difficult to control the air traffic in this situation. The proposed algorithm relocates the data block with minimum movement by considering the characteristics of datablock. The moving distance of minimum movement is calculated using the height or width of rectangle which is created during overlapping. And the moving direction of minimum movement is calculated by considering the directivity of the datablock. When the distance between the target symbol and datablock is distant enough, the relocation is carried out using the existing algorithm as a special case. The proposed algorithm shows improved performance in comparison with the existing algorithm due to the fact that it considers many different cases of the datablock.
A Study for Hybrid Honeypot Systems
Lee, Moon-Goo ;
Journal of the Institute of Electronics and Information Engineers, volume 51, issue 11, 2014, Pages 127~133
DOI : 10.5573/ieie.2014.51.11.127
In order to protect information asset from various malicious code, Honeypot system is implemented. Honeypot system is designed to elicit attacks so that internal system is not attacked or it is designed to collect malicious code information. However, existing honeypot system is designed for the purpose of collecting information, so it is designed to induce inflows of attackers positively by establishing disguised server or disguised client server and by providing disguised contents. In case of establishing disguised server, it should reinstall hardware in a cycle of one year because of frequent disk input and output. In case of establishing disguised client server, it has operating problem such as procuring professional labor force because it has a limit to automize the analysis of acquired information. To solve and supplement operating problem and previous problem of honeypot's hardware, this thesis suggested hybrid honeypot. Suggested hybrid honeypot has honeywall, analyzed server and combined console and it processes by categorizing attacking types into two types. It is designed that disguise (inducement) and false response (emulation) are connected to common switch area to operate high level interaction server, which is type 1 and low level interaction server, which is type 2. This hybrid honeypot operates low level honeypot and high level honeypot. Analysis server converts hacking types into hash value and separates it into correlation analysis algorithm and sends it to honeywall. Integrated monitoring console implements continuous monitoring, so it is expected that not only analyzing information about recent hacking method and attacking tool but also it provides effects of anticipative security response.
Long Distance Face Recognition System using the Automatic Face Image Creation by Distance
Moon, Hae Min ; Pan, Sung Bum ;
Journal of the Institute of Electronics and Information Engineers, volume 51, issue 11, 2014, Pages 137~145
DOI : 10.5573/ieie.2014.51.11.137
This paper suggests an LDA-based long distance face recognition algorithm for intelligent surveillance system. The existing face recognition algorithm using single distance face image as training images caused a problem that face recognition rate is decreased with increasing distance. The face recognition algorithm using face images by actual distance as training images showed good performance. However, this also causes user inconvenience as it requires the user to move one to five meters in person to acquire face images for initial user registration. In this paper, proposed method is used for training images by using single distance face image to automatically create face images by various distances. The test result showed that the proposed face recognition technique generated better performance by average 16.3% in short distance and 18.0% in long distance than the technique using the existing single distance face image as training. When it was compared with the technique that used face images by distance as training, the performance fell 4.3% on average at a close distance and remained the same at a long distance.
Texture Classification Algorithm for Patch-based Image Processing
Yu, Seung Wan ; Song, Byung Cheol ;
Journal of the Institute of Electronics and Information Engineers, volume 51, issue 11, 2014, Pages 146~154
DOI : 10.5573/ieie.2014.51.11.146
The local binary pattern (LBP) scheme that is one of the texture classification methods normally uses the distribution of flat, edge and corner patterns. However, it cannot examine the edge direction and the pixel difference because it is a sort of binary pattern caused by thresholding. Furthermore, since it cannot consider the pixel distribution, it shows lower performance as the image size becomes larger. In order to solve this problem, we propose a sub-classification method using the edge direction distribution and eigen-matrix. The proposed sub-classification is applied to the particular texture patches which cannot be classified by LBP. First, we quantize the edge direction and compute its distribution. Second, we calculate the distribution of the largest value among eigenvalues derived from structure matrix. Simulation results show that the proposed method provides a higher classification performance of about 8 % than the existing method.
Local Histogram Equalization using Illumination Information
Kang, Hee ; Song, Ki Sun ; Kang, Moon Gi ;
Journal of the Institute of Electronics and Information Engineers, volume 51, issue 11, 2014, Pages 155~164
DOI : 10.5573/ieie.2014.51.11.155
Local histogram equalization is one of the most popular ways of enhancing the local brightness features of an input image. However, local histogram equalization reveals some problems. First, undesired artifacts are produced by over-enhancing the local features. Second, the enhancement of local features does not always result in global contrast enhancement. To cope with these problems, we propose an illumination driven local histogram equalization method. First, to estimate the illumination information, the proposed method combines the input image and the blurred image produced through the process of the down-sampling and the up-sampling. Next, the proposed method adaptively adjusts the mapping function estimated by the local histogram equalization using the information of the illumination. As a result, the proposed illumination information driven local histogram equalization method simultaneously enhances the global and the local contrast levels while preventing any local artifacts. Experimental results show that the proposed algorithm outperforms the conventional methods on objective and subjective criteria.
Fast and High-Quality Haze Removal Method Based on Transmission Correction
Kim, Won-Tae ; Bae, Hyun-Woo ; Kim, Tae-Hwan ;
Journal of the Institute of Electronics and Information Engineers, volume 51, issue 11, 2014, Pages 165~173
DOI : 10.5573/ieie.2014.51.11.165
This paper presents a fast and high-quality haze removal method by the modification of the conventional transmission estimation process. In the conventional haze removal method, the halo and blocking artifacts arises while estimating the transmission. In order to effectively reduce the artifacts, the proposed method employs the maximum filter after the calculation of the dark channel. Because of the reduction of the artifacts, the proposed method can simplify the transmission refinement process without sacrificing the quality of the results: this paper proposes to use the single-channel guided filter instead of the multi-channel guided filter. The experimental results demonstrate that the quality of the dehazed results by the proposed transmission correction process is improved and the haze removal speed is increased by up to 59.6%, when compared to the conventional ones.
Random Pixel Sampling-based Backlight Dimming for Liquid Crystal Display
Kang, Suk-Ju ; Kim, Young Hwan ;
Journal of the Institute of Electronics and Information Engineers, volume 51, issue 11, 2014, Pages 174~180
DOI : 10.5573/ieie.2014.51.11.174
In this paper, we propose the random pixel sampling technique to solve the high computational complexity in the perceptual SSIM-based backlight dimming. Specifically, the proposed algorithm selects pixels in a total frame considering the pre-defined number, and generates the block by combining these pixels. Then, it estimates parameters, which are required in the SSIM calculation, in the combined block, and hence, it can reduce the computation time significantly. In the experimental results, the proposed algorithm reduced the average power consumption and computation time by up to 38.1776 % and 99.5828 %, respectively while preserving the average SSIM., compared with the conventional algorithm.
Exploiting Color Segmentation in Pedestrian Upper-body Detection
Park, Lae-Jeong ;
Journal of the Institute of Electronics and Information Engineers, volume 51, issue 11, 2014, Pages 181~186
DOI : 10.5573/ieie.2014.51.11.181
The paper proposes a new method of segmentation-based feature extraction to improve performance in pedestrian upper-body detection. General pedestrian detectors that use local features are often plagued by false positives due to the locality. Color information of multi parts of the upper body is utilized in figure-ground segmentation scheme to extract an salient, "global" shape feature capable of reducing the false positives. The performance of the multi-part color segmentation-based feature is evaluated by changing color spaces and the parameters of color histogram. The experimental result from an upper-body dataset shows that the proposed feature is effective in reducing the false positives of local feature-based detectors.
A Threshold Controller for FAST Hardware Accelerator
Kim, Taek-Kyu ; Suh, Yong-Suk ;
Journal of the Institute of Electronics and Information Engineers, volume 51, issue 11, 2014, Pages 187~192
DOI : 10.5573/ieie.2014.51.11.187
Various researches are performed to extract significant features from continuous images. The FAST algorithm has the simple structure for arithmetic operation and it is easy to extraction the features in real time. For this reason, the FPGA based hardware accelerator is implemented and widely applied for the FAST algorithm. The hardware accelerator needs the threshold to extract the features from images. The threshold is influenced not only the number of extracted features but also the total execution time. Therefore, the way of threshold control is important to stabilize the total execution time and to extract features as much as possible. In order to control the threshold, this paper proposes the PI controller. The function and performance for the proposed PI controller are verified by using test images and the PI control logic is designed based on Xilinx Vertex IV FPGA. The proposed scheme can be implemented by adding 47 Flip Flops, 146 LUTs, and 91 Slices to the FAST hardware accelerator. This proposed approach only occupies 2.1% of Flip Flop, 4.4% of LUTs, and 4.5% of Slices and can be regarded as a small portion of hardware cost.
Facial Expression Recognition using Face Alignment and AdaBoost
Jeong, Kyungjoong ; Choi, Jaesik ; Jang, Gil-Jin ;
Journal of the Institute of Electronics and Information Engineers, volume 51, issue 11, 2014, Pages 193~201
DOI : 10.5573/ieie.2014.51.11.193
This paper suggests a facial expression recognition system using face detection, face alignment, facial unit extraction, and training and testing algorithms based on AdaBoost classifiers. First, we find face region by a face detector. From the results, face alignment algorithm extracts feature points. The facial units are from a subset of action units generated by combining the obtained feature points. The facial units are generally more effective for smaller-sized databases, and are able to represent the facial expressions more efficiently and reduce the computation time, and hence can be applied to real-time scenarios. Experimental results in real scenarios showed that the proposed system has an excellent performance over 90% recognition rates.
Research on Light Application System for the Dynamic Moving Effect of The Design on Porcelain
Ryoo, Hee Soo ;
Journal of the Institute of Electronics and Information Engineers, volume 51, issue 11, 2014, Pages 205~210
DOI : 10.5573/ieie.2014.51.11.205
This is concerned with the technology to display the design on Porcelain and adjust malfunction for moving effect and light intensity by curator. More precisely, the technology makes it possible that the porcelain is connected to Light module which is the device for controlling light emission and rotating rolling plate, etc that are connected to LED light module, optical fiber and controller that is for scenario from the given storytelling. In addition, with a WiFi portable device (Smart-phone, other mobile device). equipped with a scenario programs, information for operation, failure and malfunction can be obtained and analyzed in real-time, and menu color and alarm is alerted when the displaying design is in abnormal status, which makes the early reactions to the status. Furthermore, the collected data can be sent through WiFi network to the device and PC managed by the curator specialized in managing the design on the Porcelain, thus the technology could help the curator who have less knowledge about moving pattern on the Porcelain. There is always a possibility of malfunction due to various condition that are caused by wring-harness when modules are wired-connected. In this research, in order to overcome this problem, we propose a system configuration that can do monitoring and diagnosis with a device for collecting data from LED control module, Light emission sensor and a personal WiFi device. Also, we performed connection between optical Fiber and LED and interlock for the system defined by the definition for information and storytelling scenario.
A Design of a Full FPGA-based DC-motor Control and Monitoring System
Lim, Byung Gyu ; Kang, Moon Ho ;
Journal of the Institute of Electronics and Information Engineers, volume 51, issue 11, 2014, Pages 211~220
DOI : 10.5573/ieie.2014.51.11.211
In this paper a full FPGA-based and compact motor-control system is shown that makes it easy to control the motor and analyze the result data in real time with embedding not only a DC motor controller but also a TFT LCD interface in a single FPGA. Both a PID speed control module for a DC motor and a monitoring module for plotting real time graphs on to a TFT LCD are designed in a single FPGA, and the system validity is shown through simulation and experimental results. The FPGA used is xc3s400 and the entire system is designed by using the AD (Altium Designer). A PWM motor drive system is constructed by using MOSFETs for a DC motor 4-quadrant operations.
Development and Evaluation of an Indirect Illumination for Tongue Image Acquisition
Jung, Chang Jin ; Kim, Keun Ho ; Jang, Jun-Su ; Jeon, Young Ju ;
Journal of the Institute of Electronics and Information Engineers, volume 51, issue 11, 2014, Pages 221~228
DOI : 10.5573/ieie.2014.51.11.221
The color and shape of the tongue reflect the physiological and clinico-pathological condition of the body. Recently, various tongue image acquisition devices have been developed for accurate diagnosis based on quantitative and objective tongue features. Since a color information is essential for tongue diagnosis, the performance of an illuminator is very important for the tongue image acquisition device. In this study, we developed an indirect illumination, which is possible to improve a homogeneity of light intensities on the tongue surface, and evaluated its performances. In order to realize the indirect illumination (II), a semi-ellipsoidal solid structure (SESS) for the light reflex was located in the system, and two high-brightness white LEDs were placed for illuminating the areas under frontal camera in the SESS. The tongue surface was illuminated by reflected light from the SESS. The light homogeneity induced by three different illuminations including the II was evaluated by calculating coefficient of variation (CV) of illuminance of five regions. The II showed less than 0.01 of CV and the direct illumination (DI) and the direct illumination with a light diffusion plate (DILDP) showed 0.16 and 0.13, respectively. The reflexed pixel ratios of tongue phantom images show 5.76%, 4.22%, 1.79% for the DI, the DILDP and the II, respectively. The homogeneity of a tongue phantom was evaluated by calculating CV of mean pixel values of six different tongue regions, and showed less than 0.06 in the II. If the II technique apply to tongue diagnosis system, it is expected to improve diagnostic accuracy in clinic.
A Study on Failures by Abnormal Al
Layer after PCT
Choi, Chae-Hyoung ; Choi, Deuk-Sung ; Jeong, Seung-Hyun ;
Journal of the Institute of Electronics and Information Engineers, volume 51, issue 11, 2014, Pages 231~237
DOI : 10.5573/ieie.2014.51.11.231
In this paper, we have proceeded research for failures of semiconductor device stressed by Pressure Cooker Test(PCT). After PCT stress, we found various failures such as delamination between aluminium line and device layers and chemical composition transition of aluminium. We have executed the analysis using the physical and chemical observation equipments. There were the main failures that aluminium loss of aluminium pad is occurred and
)) layer is formed abnormally. The primary cause of the failures is reaction of supplied fluorine or chlorine gases and infiltrated moisture during etching process.