• Journal of Advanced Marine Engineering and Technology
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• v.41 no.1
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• pp.56-61
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• 2017

This paper presents a data prediction method and its application to haptic-based teleoperation systems. In general, time delays inevitably occur during data transmission in a network environment, which degrades the overall performance of haptic-based teleoperation systems. To address this situation, this paper proposes an autoregressive moving average (ARMA) model-based data prediction algorithm for estimating model parameters and predicting future data recursively in real time. The proposed method was applied to haptic data captured every 5 ms while bilateral haptic interaction was carried out by two users with an object in a virtual space. The results showed that the prediction performance of the proposed method had an error of less than 1 ms when predicting position-level data 100 ms ahead.

• The Journal of the Korea institute of electronic communication sciences
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• v.8 no.8
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• pp.1201-1206
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• 2013

Active Appearance Model(AAM) is one of the facial feature extraction techniques. In this paper, we propose the Multiple Active Appearance Model(MAAM). Proposed method uses two AAMs. Each AAM trains using different training parameters. It causes that each AAM has different strong points. One AAM complements the weak points in the other AAM. We performed the facial feature extraction on the 100 images to verify the performance of MAAM. Experiment results show that MAAM gives more accurate results than AAM with less fitting iteration.

• Journal of the Korean Institute of Illuminating and Electrical Installation Engineers
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• v.20 no.1
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• pp.100-110
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• 2006

This paper presents the demagnetization and iron loss analysis of the single phase Flux Reversal Machine. It has a magnetic configuration similar to the switched reluctance machine but with multipole permanent magnets of alternate polarity on each stator salient pole embraced by concentrated coils. But it can be demagnetized by sudden over current and core losses increase because switching frequency is getting faster. This paper show demagnetization of permanent magnet and iron loss characteristic, and proposed a solution.

• Korean Chemical Engineering Research
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• v.46 no.2
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• pp.222-226
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• 2008

Nanoparticles have been developed and applied for various applications to intelligently deliver bioactive materials. Herein, lactocin was processed into nanoparticles with methacrylic acid-methyl methacrylate copolymer (1:1) (eudragit L100). The eudragit polymer can protect lactocin from the stomach acid and release lactocin in the intestines. When acetone and pH 7 buffer solution were used as non-solvent and solvent, respectively, the smallest volume-average particle size (290 nm) could be obtained. Freeze drying in presence of carrageenan (dispersant) can process the particles into dried powders with minimum aggregation. SEM observation revealed the primary particles prepared based on lactocin and eudragit were of a few tens of nanometers.

• Journal of the Korean Institute of Telematics and Electronics
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• v.8 no.6
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• pp.8-16
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• 1971

This paper describes the transistorized linear counting ratemeter which can be uses to indicate on the meter or record the counting rates of the nuclear radiations produced from the atomic reactor or from the radio isotopes. Tte feature of this ratemeter is the use of the transistor chopper for good stabilization. At the input stage of the a. c. amplifier a composite emitter follower buffer stage has been used to give the high input impedance. A hybrid parameter equivalent circuit was modeled for the analysis of this buffer stage. The counting rates can be linearly measured from few CPS up to 100KCPS in 4 ranges. The resolution is less than 0.5$\mu$sec and the output drift at the room temperature with 7-hour continuous operation is in the order of $\pm$0.5$\mu$A.

• Journal of the Korean Institute of Telematics and Electronics T
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• v.36T no.4
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• pp.17-23
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• 1999

This paper described a security system using text-independent speaker recognition algorithm. Security system is based on PIC16F84 and sound card. Speaker recognition algorithm applied a k-means based model and weighted cepstrum for speech features. As the experimental results, recognition rate of the training data is 100%, non-training data is 99%. Also false rejection rate is 1%, false acceptance rate is 0% and verification mean error rate is 0.5% for registered 5 persons.

• Journal of IKEEE
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• v.24 no.2
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• pp.403-408
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• 2020

Photovoltaic (PV) has both intermittent and uncertainty in nature, so it is difficult to accurately predict. Thus anomaly detection technology is important to diagnose real time PV generation. This paper identifies a correlation between various parameters and classifies the PV data applying k-nearest neighbor and dynamic time warpping. Results for the two classifications showed that an outlier detection by a fault of some facilities, and a temporary power loss by partial shading and overall shading occurring during the short period. Based on 100kW plant data, machine learning analysis and test results verified actual outliers and candidates of outlier.

• Journal of the Korean Institute of Telematics and Electronics C
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• v.36C no.11
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• pp.10-17
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• 1999

In this paper, CMOS IADC(Current-mode Analog-to-Digital Converter) which consists of only CMOS transistors is proposed. Each stages is made up 1.5-bit bit cells composed of CSH(Current-mode Sample-and-Hold) and CCMP(Current Comparator). The differential CSH which designed to eliminate CFT(Clock Feedthrough), to meet at least 9-bit resolution, is placed at the front-end of each bit cells, and each stages of bit cell ADSC (Analog-to-Digital Subconverter) is made up two latch CCMPs. With the HYUNDAI TEX>$0.65\mu\textrm{m}$ CMOS parameter, the ACAD simulation results show that the proposed IADC can be operated with 47 dB of SINAD(Signal to Noise- Plus-Distortion), 50dB(8-bit) of SNR(Signal-to-Noise) and 37.7 mW of power consumption for input signal of 100 KHz at 20 Ms/s.

• Journal of Energy Engineering
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• v.19 no.1
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• pp.21-24
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• 2010

We present a novel electrochemical method to fabricate a single Pd nanowire based on direct current assisted dielectropheresis (DEP) process between two predefined metal electrodes. The electrochemical methods was investigated as functions of frequency and voltage for optimal growth conditions of Pd nanowire. The synthesized Pd nanowire have a good resistance of $1\;k{\Omega}$, diameters of several hundred nanometers on average and lengths of $8\;{\mu}m$. Finally, the single Pd nanowire was capable of detecting hydrogen in the concentration range from 100 to 2500 ppm with high sensitivity and response time, thus demonstrating its suitability for use as a hydrogen sensor.

• Journal of the Institute of Electronics and Information Engineers
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• v.50 no.9
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• pp.100-106
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• 2013

AMI enables bi-directional exchange of information between utilities and consumers in order to maximize energy efficiency. To enable the AMI, it is essentially required to construct stable communication networks. This paper shows the AMI system based on IEEE 802.11s as one of the communication methods. Experimental results show that the wireless mesh network technology achieves a stable communication performance over a wide coverage.