• Journal of Korean Academy of Nursing
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• v.25 no.1
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• pp.17-29
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• 1995

This study was done to analysis data on breastfeeding mothers. This stud was conducted using data from telephone counseling in one metropolitan area. The subjects who had received consultation about breastfeeding were 100 breastfeeding mothers. The period of consultation was from Mar. 9, 1994 to August 23, 1994. Consultants were referred from UNICEF, hospitals, TV, newspapers or magazines. Analysis of the problem patterns resulted in 11 classifications. These were physio -anatomical factors(11 cases) , psychological factors(15 cases), breastfeeding methods(21 cases), breastfeeding intervals and frequency(19 cases) , disease in the breastfeeding mothers(13 cases), disease in the babies (12 cases), lack of support (4 cases), food and drugs while breastfeeding(5 cases), weaning(11 cases), others(27 cases). The highest frequency was for breastfeeding methods (21 cases). When the contents of the counselling were analyzed for the 100 cases, 36 problem patterns were identified. Patterns with over 10 responses were diarrhea, insufficient milk supply, sore and cracked nipples, weaning, inverted nipples and jaundice. The age of infants when mothers were telephoned was as below : 1 week(28 cases), 2 weeks(12 cases), 3-4 weeks(18 cases), 5-8 weeks(7 cases), 9 weeks-3 menths(4 cases), 4 menths-6 months(12 cases), over 6 months(2 cases), and the number of pregnant women was 12. The nursing diagnosis were classified according to problem patterns and each diagnosis was assigned an appropriate Problem Pattern The total number of nursing diagnoses was 22. When clients are referred for counselling nurses need guidelines about problems, possible causes and nursing. In this study, the example of guidelines for sore nipples is suggested. The recommendations based on the telephone counseling results are as follows : Prenatal education about the advantages of breastfeeding and breast care, and home visits after delivery for counseling related to breastfeeding. During the hospital stay, nursing intervention such as education on breastfeeding methods using slides, audio-visual tapes, pamphlets are needed as well as an initial trial of breastfeeding. Further research is indicated on the perceived lack of breast milk and on the effectiveness of nursing interventions to pro-mote breastfeeding.

• Journal of the Korean Institute of Illuminating and Electrical Installation Engineers
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• v.16 no.5
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• pp.66-74
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• 2002

OFDM(Orthogonal Frequency Division Multiplexing)is a one of the nst promising digital modulation techniques adapted for Digital audio broadcasting or Digital TV since it is very robust against multipath fading channels. From 1997, since the OFDM technique was considered as the physical layer standard for the high data rate wireless LAN systems in the 5㎓ band, related studies have been studied actively. The key element to implement high data rate wireless LAN system using OFDM technique are IFFT and FFT modules. In this paper, new IFFT and FFT module are designed and implemented using current cut circuit based on the matrix-rounding process for the low-power consumptive operation and high-speed data processing. In addition to, we certify the available operation of the rounded IFFT/FFT module in the AWGN channel by using the BER performance simulation of IEEE 802.11TGa based OFDM modem with rounded IFFT/FFT module.

• The KIPS Transactions:PartB
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• v.8B no.5
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• pp.579-586
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• 2001

Digital watermarking is to embed imperceptible mark into image, video, audio, and text data to prevent the illegal copy of multimedia data. arbitrary modification, and also illegal sales of the copies without agreement of copyright ownership. In this paper, we study for the embedding and extraction of watermark key using wavelet in the luminance signal in order to implement the system to protect the copyright for image MPEG. First, the original image is analyzed into frequency domain by discrete wavelet transform. The RSA(Rivest, Shamir, Aldeman) public key of the coded target is RUN parameter of VLD(variable length coding). Because the high relationship among the adjacent RUN parameters effect the whole image, it prevents non-authorizer not to possess private key from behaving illegally. The Results show that the proposed method provides better moving picture and the distortion more key of insert than direct coded method on low-frequency domain based DCT.

• Journal of the Korean Society of Fisheries and Ocean Technology
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• v.25 no.4
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• pp.200-208
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• 1989

To the purpose of preparation for investigating aspect of material that not revealed by the light microscope and extending our knowledge in applicable field, a scanning acoustic microscope system of 200MHz was organized and appraised its performance with experiments. Professor N.CHUBACHI in Tohoku University in Sendai, Japan provided the ZnO transducer with lens. The system for transmitting and receiving ultrasonic pulses of 200nsec was organized with a rectangular audio wave generator for modulation of 200MHz carrier wave, gating system for transmitting and receiving, mixer for converting intermediate frequency, a directional coupler, ZnO transducer, radio frequency amplifiers. detecter and personal computer. The Scanning system was driven in micro steps with three stepping motors in the direction of x, y and z axes. The system was a reflecting type scanning acoustic microscope and the operation program processed graphics data from receiving echo intensities. Photograph of fish scale obtained by optical microscope was compared with its image by the scanning acoustic microscope organized here. The result was satisfiable.

• Proceedings of the KIPE Conference
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• 2003.11a
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• pp.214-217
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• 2003

The connectorless power supply system on that multi-contact causes confidence when the wiring reconstructed in the rear. As you see above, contact points between sets and indoor space cause inferior function of audio frequency so it needs to be eliminated. This paper explains the structure of connectorless power supply to supply the system with power crossing the air gap in the part of inductively in the connectorless power supply of both magnetic and electrical model. To get maximum output of electrical load, compensating capacitor compensates to show inter-inductance, lequeage-inductance reducing the track-inductance and access the conditions for resonance. At that time it accesses the maximum electric power. The small change of the value of compensating capacitor causes the changes of maximum electric power. Here the power electronics technology is used not only in the industrial machinery but also in the home appliances so the switching power supply is used to actualize the miniaturization, lightweight, and high efficiency. Generally the condenser input methods are widely used in the rectification circuit of switching power supply, but condenser input method generate great quantity of high frequency components because with this method the current flows in the power input filtering condenser only around value of peak of ac input voltage. To solve these problems, installation of power factor improve circuit on the front of filtering capacitence was considered. Several methods were suggested regarding, but the active filter method which makes smalliging and highly power factor possible are the produce main stream. IC for power factor improvement can be utilized by CMOS process proposing low power consumption. When the high power factor is considered seriously in the power factor improvement circuit, active filter method is selected. In the active filter method, the boost converter is used. Regarding this ·the boost converter is needed.

• The Journal of Korean Institute of Communications and Information Sciences
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• v.37 no.8A
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• pp.712-719
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• 2012

This paper presents Single-bit Third order Delta-Sigma Modulator, which can be applied to the Low speed High resolution ADC in Audio signal Process System. Whereas the Operational Amplifier in modulator consumed static power dissipation in operating, this modulator used Switching on/off techniques, which makes the Power dissipation of the modulator reduced. Also proposed modulator minimizes frequency characteristic variation by optimizing switch position. And this modulator chooses Single-bit type to guarantee stability. The designed ADC went through 0.35um CMOS n-well 1-poly 4-metal process to be a final product, and the final product has shown 17.1mW of power dissipation with 3.3V of Supply Voltage, 6.4MHz of conversion rate. And 84.3dB SNDR and 13.5bit ENOB with 20KHz of input frequency.

• The Korean Journal of Community Living Science
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• v.21 no.4
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• pp.559-569
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• 2010

This study investigated the educational status, students' recognition, educational needs and degree of difficulty on the food and nutrition section of Technology Home economics subject in middle schools. It was carried out through questionnaires. The subjects were 503(boys; 246, girls; 257) middle school students in 3rd grade in the Daejeon area. The results were as follows. The students' preference for food and nutrition section was 58.5% of boys and 72.0% of girls. On the educational status of this section, The highest cooking frequency was once a year(52.3%), but 12.9% of students had never done cooking practice. Generally, practice education was not enough in subjected schools. The education of food and nutrition section was mainly conducted by lecture. For the behavioral change of students after learning this section, 'I can cook some simple foods' was the most(36.8%) than the other. The contents of high educational needs in this section were 'cooking foods' and ‘basic cooking methods'. A average degree of difficulty in this section was 2.89 points of the likert scale(1~5 point), particularly, 'change of food components by cooking' was the highest at 3.17 points of likert scale(1~5 point) in this degree. In relation to demographic background, the difficult degrees of this section were significantly higher than the other, when their parent's education was under middle school and their fathers' had no occupation. It suggests an increase in cooking frequency, complementing contents needed in life and using various audio-visual education aids are necessary for the education of food and nutrition section.

• Journal of the Institute of Electronics Engineers of Korea SC
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• v.40 no.5
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• pp.341-349
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• 2003

A real time interactive controller (spectrometer) for magnetic resonance imaging (MRI) system has been developed using high speed digital signal processors (DSP). The controller generates radio frequency (rf) waveforms and audio frequency gradient waveforms and controls multiple receivers for data acquisition. By employing DSPs having high computational power (e.g., TMS320C670l) real time generation of complicated gradient waveforms and interactive control of selection planes are possible, which are important features in real-time imaging of moving organs, e.g., cardiac imaging. The spectrometer was successfully implemented at a 1.5 Tesla whole body MRI system for clinical application. Performance of the spectrometer is verified by various experiments including high- speed imaging such as fast spin echo (FSE) and echo planar imaging (EPI). These high-speed imaging techniques reduce measurement time, however, usually intensify artifact if there is any systematic phase error or jitter in the synchronization between the transmitter, receiver, and gradients.

• The Journal of the Korea institute of electronic communication sciences
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• v.18 no.5
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• pp.859-866
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• 2023

This paper focuses on configuring a user-friendly system of LED systems by applying improvement measures such as gamma correction, non-flicker, and driving noise removal using MCUs and LED drivers. As a result of the experiment, the 22kHz PWM mode of the LED driver generated noise outside the audible frequency range, making it practically imperceptible to users. The appropriate pull-up resistor values within the normal operating delay ratio of 5% were found to be 1kΩ to 10kΩ for the 3kHz PWM mode and 1kΩ to 2kΩ for the 22kHz PWM mode. In addition, gamma correction can be optimized for nonlinear human visual systems to express accurate contrast and as a result, it is expected to develop an LED system that can be expressed more naturally and accurately than conventional LED systems and improve users' visual experience.

• The Journal of the Acoustical Society of Korea
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• v.26 no.6
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• pp.301-305
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• 2007

In this paper, we propose a simple algorithm for detecting underwater transient signals on the fact that the frequency range of underwater transient signals is similar to audio frequency. For this, we use a preprocessing module of EVRC speech codec that is the standard speech codec of the mobile communications. If a signal is entered into EVRC noise suppression module, we can get some parameters such as the update flag, the energy of each channel, the noise suppressed signal, the energy of input signal, the energy of background noise, and the energy of enhanced signal. Therefore the energy of the enhanced signal that is normalized with the energy of the background noise is compared with the pre-defined detection threshold, and then we can detect the transient signal. And the detection threshold is updated using the previous value in the noisy period. The experimental result shows that the proposed algorithm has $0{\sim}4% error rate in the AWGN or the colored noise environment.