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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 52, Issue 12 - Dec 2015
Volume 52, Issue 11 - Nov 2015
Volume 52, Issue 10 - Oct 2015
Volume 52, Issue 9 - Sep 2015
Volume 52, Issue 8 - Aug 2015
Volume 52, Issue 7 - Jul 2015
Volume 52, Issue 6 - Jun 2015
Volume 52, Issue 5 - May 2015
Volume 52, Issue 4 - Apr 2015
Volume 52, Issue 3 - Mar 2015
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Volume 52, Issue 1 - Jan 2015
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Design and Implementation of Bio-data Monitering System Based on ISO/IEEE 11073 DIM/REST for IoT Healthcare Service
Choi, Ju-Hyun ; Chun, Seung-Man ; Jang, Dong-Hyun ; Park, Jong-Tae ;
Journal of the Institute of Electronics and Information Engineers, volume 52, issue 3, 2015, Pages 3~12
DOI : 10.5573/ieie.2015.52.3.003
Recently, various studies have been attempted to provide a biological information monitoring service through integrating with the web service. The medical information transmission standard ISO/IEEE 11073 PHD defines the optimized exchange protocol ISO/IEEE 11073-20601 based on the No-IP to exchange the biometric information between the ISO/IEEE 11073 agent and the manager. It`s system structure based on the No-IP using ISO/IEEE 11073-20601 is not suitable for providing a remote biological information monitoring services. That is because it is difficult to provide to control and manage the biological information measurement devices, which have installed IP protocol stack at the remote. Furthermore, ACSE and CMDISE in ISO/IEEE 11073-20601 are not suitable to provide U-healthcare services based on IoT because they are complicated and difficult to implement it caused by the structural complexity. In order to solve the problems, in this paper, we propose the biological information monitoring architecture based on ISO/IEEE 11073 DIM/REST of IoT environment to provide the biological information monitoring service based on IoT. To do this, we designed biological information monitoring system architecture based on IoT and the message exchange protocol of ISO/IEEE 11073 DIM/REST between the ISO/IEEE 11073 agent and the ISO/IEEE 11073 manager. In order to verify the realistic possibility of the proposed system architecture, we developed the service prototype.
Analysis of Optimum Integration on the GNSS and the Vision System
Park, Chi-Ho ; Kim, Nam-Hyeok ; Park, Kyoung-Yong ;
Journal of the Institute of Electronics and Information Engineers, volume 52, issue 3, 2015, Pages 13~18
DOI : 10.5573/ieie.2015.52.3.013
This paper proposes an optimum vision system analysis and a reliable high-precision positioning system that converges a GNSS and a vision system in order to resolve position error and outdoor shaded areas two disadvantages of GNSS. For location determination of the object, it should receive signal from at least four GNSS. However, in urban areas, exact location determination is difficult due to factors like high buildings, obstacles, and reflected waves. In order to deal with the above problem, a vision system was employed. First, determine an exact position value of a target object in urban areas whose environment is poor for a GNSS. Then, identify such target object by a vision system and its position error is corrected using such target object. A vehicle can identify such target object using a vision system while moving, make location data values, and revise location calculations, thereby resulting in reliable high precision location determination.
Optimization of the Number of Antennas for Energy Efficiency in Massive MIMO WPCN
Han, Yonggue ; Sim, Dongkyu ; Lee, Chungyong ;
Journal of the Institute of Electronics and Information Engineers, volume 52, issue 3, 2015, Pages 19~24
DOI : 10.5573/ieie.2015.52.3.019
We introduce an optimization of the number of base station antennas in massive multiple-input multiple-output (MIMO) wireless powered communication network (WPCN). We use channel hardening property of massive MIMO system to approximate channel gain in terms of the number of base station antennas. Then, we find an optimal solution by partial differential and obtain a closed form solution by using Lambert-W function. The simulation results show that the approximation and the method of solving the optimization problem are reasonable, and the optimal solution of proposed scheme is almost identical to the optimal number of base station antennas by the exhaustive search method.
A Study on PEP based on Cross-layer and Network Coding in DVB-RCS Networks
Lee, Kyu-Hwan ; Jung, Hyun-Ki ; Kim, Jae-Hyun ;
Journal of the Institute of Electronics and Information Engineers, volume 52, issue 3, 2015, Pages 25~31
DOI : 10.5573/ieie.2015.52.3.025
In this paper, we propose PEP based on cross-layer and network coding in digital video broadcasting-return channel via satellite (DVB-RCS) networks. In particular, we propose not only a scheme of cross-layer information exchange for interaction between TCP and the resource allocation (RA) scheme in the link layer but also a tuning algorithm for the TCP contention window (CWND) by using information on the RA in the link layer and the redundancy rate for network-coded packets. The simulation results show that TCP CWND can be adjusted by RA information in the proposed protocol. Furthermore, through the transmission of network-coded packets and the proposed CWND tuning algorithm, TCP throughput is enhanced in lossy environment due to user mobility without the unnecessary resource overhead.
Caching Algorithm for Core Network Offloading in Smallcell Environment
Jung, So-Yi ; Kim, Jae-Hyun ;
Journal of the Institute of Electronics and Information Engineers, volume 52, issue 3, 2015, Pages 32~38
DOI : 10.5573/ieie.2015.52.3.032
In this paper, we propose a smallcell local caching algorithm under user`s context in smallcell environment. The proposed system reduces traffic to core network and the network cost, but increases it`s performance. The proposed algorithm precache suitable files using smallcell`s regional characteristics and target`s personality. It can adjusts a storage allocation to make effective usage of our limited cache storage capacity. In order to evaluate the performance of the proposed cache algorithm, we define the cache efficiency, the decrement of core network traffic. The simulation results show that the proposed algorithm can improve performance by about 200% compared to existing web cache scheme.
CoAP-based Time Synchronization Algorithm in Sensor Network
Kim, Nac-Woo ; Son, Seung-Chul ; Park, Il-Kyun ; Yu, Hong-Yeon ; Lee, Byung-Tak ;
Journal of the Institute of Electronics and Information Engineers, volume 52, issue 3, 2015, Pages 39~47
DOI : 10.5573/ieie.2015.52.3.039
In this paper, we propose a new time synchronization algorithm using CoAP(constrained-application protocol) in sensor network environment, which handles a technique that synchronizes an explicit timestamp between sensor nodes not including an additional module for time-setting and sensor node gateway linked to internet time server. CoAP is a standard protocol for sensor data communication among sensor nodes and sensor node gateway to be built much less memory and power supply in constrained network surroundings including serious network jitter, packet losses, etc. We have supplied an exact time synchronization implementation among small and cheap IP-based sensor nodes or non-IP based sensor nodes and sensor node gateway in sensor network using CoAP message header`s option extension. On behalf of conventional network time synchronization method, as our approach uses an exclusive protocol `CoAP` in sensor network, it is not to become an additional burden for synchronization service to sensor nodes or sensor node gateway. This method has an average error about 2ms comparing to NTP service and offers a low-cost and robust network time synchronization algorithm.
Efficient Congestion Control Technique of Random Access and Grouping for M2M according to User Type on 3GPP LTE-A s
Kim, Junghyun ; Ji, Soonbae ; You, Cheolwoo ;
Journal of the Institute of Electronics and Information Engineers, volume 52, issue 3, 2015, Pages 48~55
DOI : 10.5573/ieie.2015.52.3.048
This paper studies how to solve a problem caused by M2M terminals sending a few data based on
Generation Partnership Project(3GPP) Long Term Evolution-Advanced(LTE-A) system and then it is analyzed, proposed, and introduced into the techniques. Especially, it is introduced solution for the lack of Random Access Channel and an increasing number of latency caused by countless M2M devices. It is proposed the technology for M2M grouping as well as allowable access probability according to user type. As it decreases the number of terminal by grouping M2M devices to try random access at PRACH, it can be reduced collision between Cellular users and M2M devices. So, it is proved that the proposed mechanism can solve the increasing average latency of random access on system coexisting Cellular users and M2M devices through simulations.
Improving the Light-Load Efficiency of a LDO-Embedded DC-DC Buck Converter Using a Size Control Method of the Power-Transistor
Kim, Hyojoong ; Wee, Jaekyung ; Song, Inchae ;
Journal of the Institute of Electronics and Information Engineers, volume 52, issue 3, 2015, Pages 59~66
DOI : 10.5573/ieie.2015.52.3.059
In this paper, we propose a method of improving the light-load efficiency of DC-DC buck converter using 4bit SAR-ADC (Successive Approximation ADC) for a LDO or a power transistor size selection technique. The proposed circuit selects power transistor sizes depending on load current so that improves the light-load efficiency of the DC-DC buck converter. For this, we select the power transistor size with a cross point of the switching loss and the conduction loss. Also, when the IC operates in standby mode or sleep mode, a LDO mode is selected for improving the efficiency. The proposed circuit selects power transistor sizes(X1, X2, X4, X8) with 4 bits and its efficiency is higher about the maximum of 25% at the light-load than that of a single transistor size. Input voltage and output voltage are 5V and 3.3V for maximum load currents of 500mA.
Multi-Mode BTC Image Compression Algorithm for LCD Overdriving
Cho, Moonki ; Yoon, Yungsup ;
Journal of the Institute of Electronics and Information Engineers, volume 52, issue 3, 2015, Pages 67~74
DOI : 10.5573/ieie.2015.52.3.067
BTC (Block Truncation Coding) image compression is simple to implement by hardware and has excellent edge retention capability of image, image compression techniques are widely used in LCD overdrive. In this paper, to maintain high visual quality and has high compression rate, Multi-Mode BTC (MM-BTC) algorithm is proposed. The MM-BTC has high compression rate using advanced Y-based BTC method and has high visual quality using improved 2-level and 4-level BTC method in this paper. As shown in simulation results, MM-BTC improves still image PSNR (Peak Signal to Noise Ratio) up to 2.34 dB as compared with other algorithms. When the MM-BTC is applied to LCD overdrive, MM-BTC improves moving picture PSNR up to 2.33 dB as compared with other algorithms in literature.
New Parallel MDC FFT Processor for Low Computation Complexity
Kim, Moon Gi ; Sunwoo, Myung Hoon ;
Journal of the Institute of Electronics and Information Engineers, volume 52, issue 3, 2015, Pages 75~81
DOI : 10.5573/ieie.2015.52.3.075
This paper proposed the new eight-parallel MDC FFT processor using the eight-parallel MDC architecture and the efficient scheduling scheme. The proposed FFT processor supports the 256-point FFT based on the modified radix-
FFT algorithm. The proposed scheduling scheme can reduce the number of complex multipliers from eight to six without increasing delay buffers and computation cycles. Moreover, the proposed FFT processor can be used in OFDM systems required high throughput and low hardware complexity. The proposed FFT processor has been designed and implemented with a 90nm CMOS technology. The experimental result shows that the area of the proposed FFT processor is
. Furthermore, the proposed eight-parallel MDC FFT processor can achieve the throughput rate up to 2.7 GSample/s at 388MHz.
Switch Circuit Design in 0.18㎛ BCDMOS for Small Form Factor Automotive Smart Junction Box
Lee, Ukjun ; Kwon, Geono ; Lim, Hansang ; Shin, Hyunchol ;
Journal of the Institute of Electronics and Information Engineers, volume 52, issue 3, 2015, Pages 82~88
DOI : 10.5573/ieie.2015.52.3.082
This paper presents a design of the enable switch circuit, which is consist of discrete device at smart junction box(SJB) board. The Enable switch circuit, which receives ignition signal (IG) for input, sends a drive signal to linear regulator and other elements. The circuit design is carried out in a BCDMOS
technology, and the performances are verified through simulations according to AEC-Q100 and ISO 7637-2. Die area of the designed Enable switch circuit is
in layout, and it is shown that the die can be housed in
HVSON8 package. The designed enable switch circuit is expected to be widely adopted in various automotive SJB`s since it can significantly reduce the overall printed circuit board form factor.
Study on Compressed Sensing of ECG/EMG/EEG Signals for Low Power Wireless Biopotential Signal Monitoring
Lee, Ukjun ; Shin, Hyunchol ;
Journal of the Institute of Electronics and Information Engineers, volume 52, issue 3, 2015, Pages 89~95
DOI : 10.5573/ieie.2015.52.3.089
Compresses sensing (CS) technique is beneficial for reducing power consumption of biopotential acquisition circuits in wireless healthcare system. This paper investigates the maximum possible compress ratio for various biopotential signal when the CS technique is applied. By using the CS technique, we perform the compression and reconstruction of typical electrocardiogram(ECG), electromyogram(EMG), electroencephalogram(EEG) signals. By comparing the original signal and reconstructed signal, we determines the validity of the CS-based signal compression. Raw-biopotential signal is compressed by using a psuedo-random matrix, and the compressed signal is reconstructed by using the Block Sparse Bayesian Learning(BSBL) algorithm. EMG signal, which is the most sparse biopotential signal, the maximum compress ratio is found to be 10, and the ECG`sl maximum compress ratio is found to be 5. EEG signal, which is the least sparse bioptential signal, the maximum compress ratio is found to be 4. The results of this work is useful and instrumental for the design of wireless biopotential signal monitoring circuits.
A Design and Implementation of NFC Bridge Chip
Lee, Pyeong-Han ; Ryu, Chang-Ho ; Chun, Sung-Hun ; Kim, Sung-Wan ;
Journal of the Institute of Electronics and Information Engineers, volume 52, issue 3, 2015, Pages 96~101
DOI : 10.5573/ieie.2015.52.3.096
This paper describes a design and implementation of the NFC bridge chip which performs interface between kinds of devices and mobile phones including NFC controller through NFC communication. The NFC bridge chip consists of the digital part and the analog part which are based on NFC Forum standard. Therefore the chip treats RF signals and then transforms the signal to digital data, so it can interface kinds of devices with the digital data. Especially the chip is able to detect RF signals and then wake up the host processor of a device. The wakeup function dramatically decreases the power consumption of the device. The carrier frequency is 13.56MHz, and the data rate is up to 424kbps. The chip has been fabricated with SMIC 180nm mixed-mode technology. Additionally an NFC bridge chip application to the blood glucose measurement system is described for an application example.
A Appropriate Flux Generating Conditions for Semiconductor Etching Simulation
Jeong, Seunghan ; Gwun, Oubong ; Shin, Seongsik ;
Journal of the Institute of Electronics and Information Engineers, volume 52, issue 3, 2015, Pages 105~115
DOI : 10.5573/ieie.2015.52.3.105
In semiconductor etching simulation, The source modeling for generating plasma species is required. In this paper, we modeled the source of plasma etching process with probability distribution and the feature profile with simple geometry objects, then got the flux on the feature profile. The distance between the source and the cell on the modeling parameters of the source, there are a number of particles to be emitted from a source, there is a number (area of the cell) of the cell on the profile with additional parameters to give the calculation of flux. The flux error ratio on both gaussian(Incident Flux) and cosine probability distribution(Incident Neutral Flux) is much decreased as the number of ray is increased but the processing time is more increased than that. The increase of the number of cell and distance makes increase the flux error ratio and the processing time moderately. In view of the processing time through the experimental results in this paper, it is possible to analogize the calculation of appropriate fluxes.
A Novel Task Scheduling Algorithm Based on Critical Nodes for Distributed Heterogeneous Computing System
Kim, Hojoong ; Song, Inseong ; Jeong, Yong Su ; Choi, SangBang ;
Journal of the Institute of Electronics and Information Engineers, volume 52, issue 3, 2015, Pages 116~126
DOI : 10.5573/ieie.2015.52.3.116
In a distributed heterogeneous computing system, the performance of a parallel application greatly depends on its task scheduling algorithm. Therefore, in order to improve the performance, it is essential to consider some factors that can have effect on the performance of the parallel application in a given environment. One of the most important factors that affects the total execution time is a critical path. In this paper, we propose the CLTS algorithm for a task scheduling. The CLTS sets the priorities of all nodes to improve overall performance by applying leveling method to improve parallelism of task execution and by reducing the delay caused by waiting for execution of critical nodes in priority phase. After that, it conditionally uses insertion based policy or duplication based policy in processor allocation phase to reduce total schedule time. To evaluate the performance of the CLTS, we compared the CLTS with the DCPD and the HCPFD in our simulation. The results of the simulations show that the CLTS is better than the HCPFD by 7.29% and the DCPD by 8.93%. with respect to the average SLR, and also better than the HCPFD by 9.21% and the DCPD by 7.66% with respect to the average speedup.
Mobile Device CPU usage based Context-awareness in Mobile Cloud Computing
Cho, Kyunghee ; Jo, Minho ; Jeon, Taewoong ;
Journal of the Institute of Electronics and Information Engineers, volume 52, issue 3, 2015, Pages 127~135
DOI : 10.5573/ieie.2015.52.3.127
Context-aware mobile cloud computing is a new promising paradigm that allows to improve user experience by analyzing contextual information such as user location, time of the day, neighboring devices and current activity. In this paper we provide performance study of context-aware mobile cloud computing system with Volare middleware. Volare monitors the resources and context of the device. and dynamically adapts cloud service requests accordingly, at discovery time or at runtime. This approach allows for more resource-efficient and reliable cloud service discovery, as well as significant cost savings at runtime. We also have studied the performance of context-aware mobile cloud computing for different quality of service (QoS) adaptation policies. Our simulations results show that when battery level is low and CPU usage is high and user cannot maintain the initial QoS, service cost is decreased according to current adaptation policy. In conclusion, the current adaptation policy suggested in this paper may improve user experience by providing a dynamically adapted service cost according to a situation.
Performance Measurement of Single-board System for Mobile BCI System
Lee, Hyo Jong ; Kim, Hyun Kyu ; Gao, Yongbin ;
Journal of the Institute of Electronics and Information Engineers, volume 52, issue 3, 2015, Pages 136~144
DOI : 10.5573/ieie.2015.52.3.136
The EEG system can be classified as a wired or wireless device. Each device used for the medical or entertainment purposes. The collected EEG signals from sensor are analyzed using feature extractions. A wireless EEG system provides good portability and convenience, however, it requires a mobile system that has heavy computing power. In this paper a single board system is proposed to handle EEG signal processing for BCI applications. Unfortunately, the computing power of a single board system is limited unlike general desktop systems. Thus, parallel approach using multiple single board systems is investigated. The parallel EEG signal processing system that we built demonstrates superlinear speedup for an EEG signal processing algorithm.
Detection of Car Accidents in Parking Lots
Jeong, Woo Jin ; Lee, Jong Min ; Park, Ki Tae ; Moon, Young Shik ;
Journal of the Institute of Electronics and Information Engineers, volume 52, issue 3, 2015, Pages 147~153
DOI : 10.5573/ieie.2015.52.3.147
We propose a detecting method for a car accident in parking lots. The proposed method consists of 3 parts : car detection, car tracking, and accident detection. In the car detection part, we detect the car using the pixel based foreground extraction method and the motion map. From the result of the car detection, the moving car is tracked. In the accident detection part, we set the accident detecting region in front of car, and then the car accident is detected using the difference of the motion. Experimental results show that the proposed method effectively detects the car accident in the parking lots.
UHD TV Image Enhancement using Multi-frame Example-based Super-resolution
Jeong, Seokhwa ; Yoon, Inhye ; Paik, Joonki ;
Journal of the Institute of Electronics and Information Engineers, volume 52, issue 3, 2015, Pages 154~161
DOI : 10.5573/ieie.2015.52.3.154
A novel multiframe super-resolution (SR) algorithm is presented to overcome the limitation of existing single-image SR algorithms using motion information from adjacent frames in a video. The proposed SR algorithm consists of three steps: i) definition of a local region using interframe motion vectors, ii) multiscale patch generation and adaptive selection of multiple optimum patches, and iii) combination of optimum patches for super-resolution. The proposed algorithm increases the accuracy of patch selection using motion information and multiscale patches. Experimental results show that the proposed algorithm performs better than existing patch-based SR algorithms in the sense of both subjective and objective measures including the peak signal-to-noise ratio (PSNR) and structural similarity measure (SSIM).
Design of Second-order BPS Systems for the Cancellation of Multiple Aliasing
Baek, Jein ;
Journal of the Institute of Electronics and Information Engineers, volume 52, issue 3, 2015, Pages 162~170
DOI : 10.5573/ieie.2015.52.3.162
In the bandpass sampling (BPS), the sampling frequency is lower than the frequency of the signal to be sampled. In this method, the baseband spectrum can be directly obtained by the sampling operation. This makes the frequency down converter unnecessary as well as the receiver`s circuit simpler. In the second-order BPS system, two sampling devices are used. When aliasing occurs due to the sampling operation, the aliased component can be cancelled by combining the two sampled signals. In this paper, it is presented a design method of the second-order BPS system when multiple interferences are simultaneously aliased to the signal component. The optimum phase of the interpolant filter is searched for maximizing the signal-to-interference ratio, and a practical formula for the suboptimal phase is derived in terms of the power spectrum profile of the BPS input. A computer simulation has been performed for the proposed second-order BPS system, and it has been shown that the signal-to-interference ratio can be increased by considering multiple aliasing.
Reliability Improvement of the Electronic Security Fence Using Friction Electricity Sensor by Analyzing Frequency Characteristic of Environmental Noise Signal
Yun, Seok Jin ; Won, Seo Yeon ; Kim, Hie Sik ; Lee, Young Chul ; Jang, Woo Young ;
Journal of the Institute of Electronics and Information Engineers, volume 52, issue 3, 2015, Pages 173~180
DOI : 10.5573/ieie.2015.52.3.173
A passive type of fence security system was developed, which was based on electric charge detection technique. The implemented fence security system was installed at outskirts of greenhouse laboratory in the University of Seoul. The purpose of this research is to minimize false alarms by analyzing environmental noise. The existing system determines the intrusion alarm by analyzing the power of amplified signal, but the alarm was seriously affected by natural strong wind and heavy rainfall. The SAU(Signal Analysis Unit) sends input signals to remote server which displays intrusion alarm and stores all the information in database. The environmental noise such as temperature, humidity and wind speed was separately gathered to analyze a correlation with input signal. The input signal was analyzed for frequency characteristic using FFT(Fast Fourier Transform) and the algorithm that differentiate between intrusion alarm and environmental noise signal is improved. The proposed algorithm is applied for the site for one month as the same as the existing algorithm and the false alarm data was gathered and analyzed. The false alarm number was decreased by 98% after new algorithm was applied to the fence. The proposed algorithm improved the reliability at the field regarding environmental noise signal.
Gait Phase Recognition based on EMG Signal for Stairs Ascending and Stairs Descending
Lee, Mi-Ran ; Ryu, Jae-Hwan ; Kim, Sang-Ho ; Kim, Deok-Hwan ;
Journal of the Institute of Electronics and Information Engineers, volume 52, issue 3, 2015, Pages 181~189
DOI : 10.5573/ieie.2015.52.3.181
Powered prosthesis is used to assist walking of people with an amputated lower limb and/or weak leg strength. The accurate gait phase classification is indispensable in smooth movement control of the powered prosthesis. In previous gait phase classification using physical sensors, there is limitation that powered prosthesis should be simulated as same as the speed of training process. Therefore, we propose EMG signal based gait phase recognition method to classify stairs ascending and stairs descending into four steps without using physical sensors, respectively. RMS, VAR, MAV, SSC, ZC, WAMP features are extracted from EMG signal data and LDA(Linear Discriminant Analysis) classifier is used. In the training process, the AHRS sensor produces various ranges of walking steps according to the change of knee angles. The experimental results show that the average accuracies of the proposed method are about 85.6% in stairs ascending and 69.5% in stairs descending whereas those of preliminary studies are about 58.5% in stairs ascending and 35.3% in stairs descending. In addition, we can analyze the average recognition ratio of each gait step with respect to the individual muscle.
Detection of SNPs using electrical biased method on diamond FETs
Song, Kwang Soup ;
Journal of the Institute of Electronics and Information Engineers, volume 52, issue 3, 2015, Pages 190~195
DOI : 10.5573/ieie.2015.52.3.190
The detection of single nucleotide polymorphisms (SNPs) caused of mutant or genetic diseases is important to diagnosis and medicine. There are many methods have been proposed to detect SNPs. However the detection of SNPs is difficulty, because the difference of energy between complementary DNA (cDMA) and SNPs is very small. In this work, we detect the SNPs using field-effect transistors (FETs) which based on the detection of negative charge of DNA. We bias -0.3 V on the drain-source electrode at the target DNA hybridization process. The efficiency of hybridization and the amplitude of signal decrease by repulsive force between negative charge of DNA and negative bias on the electrode. However, the sensitivity of SNPs increases about 5 times from 1.7 mV to 8.7 mV.
Stabilization Performance Evaluation of Filter(pH) Using Ionic Water Generator
Nam, Sangyep ; Kwon, Yunjung ;
Journal of the Institute of Electronics and Information Engineers, volume 52, issue 3, 2015, Pages 199~205
DOI : 10.5573/ieie.2015.52.3.199
This study is about ionic water generator filter Recently, a lot of people feel deep interest in health and drinking water. And there are various types of water. Ionic water generator is a system with special function, and can be classified as a medical device and should be manufactured after approval from the Food and Drug Administration. Basically ionized water is different from the packaged and stored water. When the tap water or ground water passes through the various filters of ionic water generator, it turns to the purified water of pH7 ~ 7.5 and we can electrolyze that water into anion and cation by diaphragm. And in negative electrode side, we can get alkaline water with calcium (
), potassium (
), magnesium (
), sodium (
) for body. In general, we can change pH value from 5 to 9 of ionizer by controlling the level of electrolysis voltage in the ionizer. In general, 1stage (pH8), 2stage (pH8.5), 3stage (pH9), 4stage (pH9.5) are used as the alkaline ionized water, -1Stage (pH6.0), -2 stage (pH5.0) are used as the acidic water. But in early stage, the water that passed through filter was weakly alkaline water and that was problem. Therefore, when filter condition is stable, the pH and ORP value of water is different with the early one. the initial setting pH value of the ionizer was confirmed that changes significantly. In order to resolve this problem we need to wash filter for some period time and neutralize by acidification treatment of the filter.
Development of Direct Teaching Control using ITO Touch Panel
Yoon, Jae Seok ; Nam, Sang Yep ; Kim, Ki Eun ; Kim, Dong-Han ;
Journal of the Institute of Electronics and Information Engineers, volume 52, issue 3, 2015, Pages 206~212
DOI : 10.5573/ieie.2015.52.3.206
This paper proposes the physical human-robot interaction method that controls the robot arms using ITO touch panel sensor as the skin of robot. To implement physical human-robot interaction, the method of using the force/torque sensor and the method of using tactile sensor created by arranging small element type of sensor have been studied. However, these sensors have the pros and cons in terms of price and performance. This study aims to demonstrate the economy of element type sensor and the accuracy of force/torque sensor through experiment by proposing the method of physical interaction using the touch panel as the skin of robot, and by constructing overall system. The experiment was carried out for the method of controlling the robot arm by installing end-effecter and the method of controlling robot arm by creating the gesture with reference point on the touch panel. Through this experiment, the possibility of teaching control using the touch panel was confirmed.
A Study on Improvement of Energy Efficiency for LEACH Protocol in WSN
Lee, Won-Seok ; Ahn, Tae-Won ; Song, ChangYoung ;
Journal of the Institute of Electronics and Information Engineers, volume 52, issue 3, 2015, Pages 213~220
DOI : 10.5573/ieie.2015.52.3.213
Wireless sensor network(WSN) is made up of a lot of battery operated inexpensive sensors that, once deployed, can not be replaced. Therefore, energy efficiency of WSN is essential. Among the methods for energy efficiency of the network, clustering algorithms, which divide a WSN into multiple smaller clusters and separate all sensors into cluster heads and their associated member nodes, are very energy efficient routing technique. The first cluster-based routing protocol, LEACH, randomly elects the cluster heads in accordance with the probability. However, if the distribution of selected cluster heads is not good, uniform energy consumption of cluster heads is not guaranteed and it is possible to decrease the number of active nodes. Here we propose a new routing scheme that, by comparing the remaining energy of all nodes in a cluster, selects the maximum remaining energy node as a cluster head. Because of decrease in energy gap of nodes, the node that was a cluster head operates as a member node much over. As a result, the network lifespan is increased and more data arrives at base station.
A Study of Factors Influencing Intention to use Technology in Teaching Activities
Joo, YoungJu ; Chung, AeKyung ; Choi, Miran ; Yi, SangHoi ;
Journal of the Institute of Electronics and Information Engineers, volume 52, issue 3, 2015, Pages 221~229
DOI : 10.5573/ieie.2015.52.3.221
The purpose of this study is to verify factors influencing attitude to use of technology in teaching activities. For this study, a hypothetical technology acceptance model(TAM) was composed of TPACK, technostress, innovation, perceived ease of use, perceived usefulness, and behavioral intention to use technology in teaching activities. The survey was administered to 254 pre-service teachers. The result of this study through structural equation modeling analysis is as follows: First, TPACK significantly affects technostress. second, perceived ease of use affects perceived usefulness. Third, TPACK, technostress, perceived usefulness affects behavioral intention to use, but innovation and perceived ease of use did not affect behavioral intention to use. These results imply that TPACK, technostress, perceived usefulness are important to enhance behavioral intention to use technology in teaching activities. This study propose the constructive foundation for providing strategies raising the behavioral intention to use of technology in teaching activities.