• Women's Health Nursing
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• v.10 no.4
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• pp.331-341
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• 2004

Purpose: This study was conducted to explore the experience of unwed mothers, to describe the structure of the understanding of this experience for mothers and to explore nursing interventions for this situation. Methods: The subjects were 4 unwed mothers. The data was collected by in-depth interviews and participant observations from February 2004 to June 2004. Each person was interviewed 4-5times, taking about one and a half hours for each session. Data was analyzed by the phenomenological method suggested by Giorgi. Result: The understanding of the experience of unwed mothers resulted in "lightness of sexual cognition", "knowledge deficit of pregnancy", "suffering form pregnancy", "ambivalence of the situation", "appearance of mothering", "worrying about society's view". Conclusion: Sex education programs, a one-round, formal lecture-type education is presently dominant, so that education and training programs can be systematized at school and home. The difficult point for unwed mothers to endure is that society doesn't accept them; therefore, we have to change our point of view, and try to work out the problems.

• Proceedings of the Korean Vacuum Society Conference
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• 2014.02a
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• pp.181.1-181.1
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• 2014

Supercapacitor is attracting growing attention for a promising energy conversion and storage device because of its desirable electrochemical properties such as rapid charge-discharge rate, high power density and long cycle life. Three-dimensional (3D) metal nanostructure has been widely studied since it can provide efficient charge transport along the 3D network in many device applications. In this work, we fabricated well-ordered 3D nickel (Ni) nanostructures using 3D-arrayed polystyrene nano-opal substrates. We also fabricated half-cell supercapacitors by electrodepositing $RuO_2$ onto these nanostructured Ni current collectors and investigated their morphological and electrochemical properties.

• Journal of the Korean Society for Precision Engineering
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• v.22 no.7 s.172
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• pp.79-87
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• 2005

This paper summarizes the work on the development of a simulation program for modelling the process of machining quasi-three dimensional shape with the excimer laser beam on a constantly moving polymers. Relatively simple masks of rectangle, triangle and half circle shape are considered. The etching depth is calculated by considering the number of laser pulses irradiated on the specimen surface. It was found that similar shapes as experimental results can be obtained by choosing suitable parameters of moving velocity, moving distance and mask sizes.

• Journal of Welding and Joining
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• v.19 no.4
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• pp.399-405
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• 2001

A dynamic force balance model is proposed in this work as an extension of the previous static force balance model to predict metal transfer in arc welding. Dynamics of a pendant drop is modeled as the second order system, which consists of the mass, spring and damper. The spring constant of a spherical drop at equilibrium is derived in the closed-form equation, and the inertia force caused by drop vibration is included in the drop detaching condition. While the inertia force is small in the low current range, it becomes larger than the gravitational force with current increase. The inertia force reaches half of the electromagnetic force at transition current, and has considerable effects on drop detachment. The proposed dynamic force balance model predicts the detaching drop size more accurately than the static force balance model.

• Journal of Biosystems Engineering
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• v.8 no.1
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• pp.30-37
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• 1983

Frequent breakdowns of power tiller, particularly in the peak labor constraints, have been a cause of decreasing machine productivity and its efficient utilization. To keep power tiller always ready to work, it may be necessary to identify the failure characteristics of some major parts of power tiller, and to have those parts replaced accordingly before they show the symptom of mulfunction. This study was conducted to identify the failure characteristics of some major parts of power tiller and to estimate their lives (MTBF) using a Weibull distribution function. The result showed that about half of breakdowns currently being occurred may be reduced through timely replacement of those part having wearout failure characteristics.

• The Transactions of the Korean Institute of Power Electronics
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• v.23 no.2
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• pp.139-146
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• 2018

This work puts forward a theoretical analysis on position estimation performance of interior permanent magnet synchronous motor (IPMSM) according to the injection frequency in carrier-based sensorless operation. The effects of spatial harmonics on inductance and voltage distortion due to the nonideal characteristics of IPMSM and inverter are examined as factors influencing the position estimation performance. Furthermore, the position estimation performance is analyzed by calculating the current at the switching instant in several operating conditions. In summary, the half switching frequency injection is more robust to the nonideal characteristics of IPMSM, especially with light load condition. The validity of the analysis is verified by the simulation and experimental results.

• Korean Journal of Air-Conditioning and Refrigeration Engineering
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• v.12 no.11
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• pp.972-981
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• 2000

Comprehensive work is done for flows by an axial fan by experimental research. The present model fan is used for air handling device for out-door unit of an air conditioner in home appliance. PIV(Particle Image Velocimetry) system and wind tunnel are adopted for measurements of flows and performance evaluation, respectively. Major experimental conditions are the installation depth of a fan into a bellmouth of it. Optimal position of a fan in an inlet guide tube is observed by examination of fan-performance and flows in both upstream and downstream of the fan. Consequently, in the case of the fan inserted in half depth into the inlet tube, the efficiency of fan shows its maximum value and flow patterns is also streamlined.

• Journal of the Korean Home Economics Association
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• v.41 no.6
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• pp.29-45
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• 2003

I compared role gratification and role strain of American and East Asian married women graduate students taking multiple roles of study, assistant work in the school, family care, and household management, etc. The American students experienced more strain overall than their East Asian counterparts. Perceived gratification and strain were strongly related to time demands for the American group and to economic conditions for East Asian group. The more nontraditional the gender-role altitudes of the East Asian students, the less strain they experienced. More than half of the East Asian students perceived that their own gender roles, but not those of their husbands had changed since they came to the United States. Perceived gender-role change of the husband was strongly related to role strain for the East Asian students.

• Journal of the Ergonomics Society of Korea
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• v.28 no.4
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• pp.101-107
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• 2009

In this study 1,079 occupational accident reports were used to examine the characteristics and causes of occupational injuries in the small-sized textile companies with less than 50 employees. These data were analyzed in terms of age of injured person, work experience, accident type, injury type, and agency of accident. The results show that there are some patterns: (1) injuries occur more frequently in the 40~49yr age group; (2) about half of all accident occurred during the first year of employment; (3) there is a higher percentage of sick people leaving in the 29~90day range; (4) 'caught in and between objects' represents the leading accident type; (5) the most common type of incidence is related to the machinery; (6) 'lower back injuries' is the leading type of occupational disorder. These results can be used to develop more effective accidental occupational injury prevention programs for small-sized textile industries.

• Journal of Electrical Engineering and Technology
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• v.13 no.1
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• pp.430-437
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• 2018

Ultrasonic attenuation is an important parameter in Quantitative Ultrasound and many algorithms have been proposed to improve estimation accuracy and repeatability for multiple independent estimates. In this work, we propose an improved algorithm for estimating ultrasonic attenuation utilizing the optimal frequency compounding technique based on stochastic noise model. We formulate mathematical compounding equations in the AWGN channel model and solve optimization problems to maximize the signal-to-noise ratio for multiple frequency components. Individual estimates are calculated by the reference phantom method which provides very stable results in uniformly attenuating regions. We also propose the guideline to select frequency ranges of reflected RF signals. Simulation results using numerical phantoms show that the proposed optimal frequency compounding method provides improved accuracy while minimizing estimation bias. The estimation variance is reduced by only 16% for the un-compounding case, whereas it is reduced by 68% for the uniformly compounding case. The frequency range corresponding to the half-power for reflected signals also provides robust and efficient estimation performance.